/* roulang page: index */
:root {
            --sd-primary: #1752B0;
            --sd-primary-dark: #0F3E88;
            --sd-accent: #F59E1B;
            --sd-accent-dark: #D9820A;
            --sd-bg: #F6F8FB;
            --sd-surface: #FFFFFF;
            --sd-text-strong: #16233B;
            --sd-text: #3A4658;
            --sd-text-muted: #6B7790;
            --sd-text-disabled: #A0A8B8;
            --sd-border: #E5EAF2;
            --sd-divider: #EEF2F7;
            --sd-radius-sm: 8px;
            --sd-radius-md: 12px;
            --sd-radius-lg: 16px;
            --sd-shadow-card: 0 8px 28px rgba(22, 87, 179, .08);
            --sd-shadow-card-hover: 0 12px 32px rgba(22, 87, 179, .16);
            --sd-font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            --sd-font-mono: "Roboto Mono", "SFMono-Regular", monospace;
            --sd-nav-height: 72px;
            --sd-nav-height-mobile: 60px;
            --sd-section-gap: 72px;
            --sd-section-gap-mobile: 48px;
            --sd-break-xl: 1200px;
            --sd-break-lg: 992px;
            --sd-break-md: 768px;
            --sd-break-sm: 576px;
            --sd-transition: .18s ease;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--sd-font-sans);
            background-color: var(--sd-bg);
            color: var(--sd-text);
            font-size: 15px;
            line-height: 1.8;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            text-decoration: none;
            color: var(--sd-primary);
            transition: color var(--sd-transition);
        }
        a:hover {
            color: var(--sd-primary-dark);
        }
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--sd-primary);
            outline-offset: 2px;
        }

        img {
            max-width: 100%;
            display: block;
        }

        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--sd-text-strong);
            line-height: 1.3;
            margin-top: 0;
        }
        h1 {
            font-size: 40px;
            letter-spacing: -0.5px;
        }
        h2 {
            font-size: 30px;
            letter-spacing: -0.3px;
        }
        h3 {
            font-size: 21px;
        }
        p {
            margin-bottom: 14px;
        }
        .text-muted-2 {
            color: var(--sd-text-muted);
        }

        .sd-container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* Header / Navigation */
        .sd-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, .98);
            backdrop-filter: blur(10px);
            box-shadow: 0 1px 0 var(--sd-border), 0 6px 18px rgba(22, 87, 179, .04);
            height: var(--sd-nav-height);
            display: flex;
            align-items: center;
        }
        .sd-header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .sd-nav-left,
        .sd-nav-right {
            display: flex;
            align-items: center;
            gap: 26px;
            flex: 1;
        }
        .sd-nav-left {
            justify-content: flex-start;
        }
        .sd-nav-right {
            justify-content: flex-end;
        }
        .sd-logo-wrap {
            flex-shrink: 0;
            padding: 0 18px;
        }
        .sd-logo {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            font-weight: 800;
            font-size: 21px;
            color: var(--sd-text-strong);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .sd-logo:hover {
            color: var(--sd-primary);
        }
        .sd-logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--sd-primary), #3A7BDE);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            box-shadow: 0 6px 16px rgba(22, 87, 179, .24);
        }
        .sd-nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--sd-text);
            padding: 6px 2px;
            position: relative;
            transition: color var(--sd-transition);
        }
        .sd-nav-link::after {
            content: "";
            position: absolute;
            left: 50%;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: var(--sd-primary);
            border-radius: 2px;
            transition: width .18s ease, left .18s ease;
        }
        .sd-nav-link:hover {
            color: var(--sd-primary);
        }
        .sd-nav-link:hover::after,
        .sd-nav-link.active::after {
            width: 100%;
            left: 0;
        }
        .sd-nav-link.active {
            color: var(--sd-primary);
            font-weight: 700;
        }

        .sd-hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--sd-text-strong);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }
        .sd-hamburger:hover {
            background: var(--sd-bg);
        }

        .sd-mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 300px;
            max-width: 80vw;
            height: 100vh;
            background: #fff;
            box-shadow: 8px 0 30px rgba(22, 87, 179, .12);
            z-index: 1100;
            padding: 24px 20px;
            transform: translateX(-100%);
            transition: transform .22s ease;
            overflow-y: auto;
        }
        .sd-mobile-menu.open {
            transform: translateX(0);
        }
        .sd-mobile-menu-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 28px;
        }
        .sd-mobile-close {
            background: none;
            border: none;
            font-size: 22px;
            color: var(--sd-text-strong);
            cursor: pointer;
        }
        .sd-mobile-menu .sd-nav-link {
            display: block;
            padding: 14px 0;
            font-size: 17px;
            border-bottom: 1px solid var(--sd-divider);
        }
        .sd-mobile-menu .sd-nav-link::after {
            display: none;
        }
        .sd-mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background: rgba(22, 35, 59, .4);
            z-index: 1090;
        }
        .sd-mobile-overlay.show {
            display: block;
        }

        /* Hero Section */
        .sd-hero {
            position: relative;
            background: linear-gradient(135deg, #F0F4FA 0%, #F6F8FB 55%, #EDF3FC 100%);
            padding: 72px 0 72px;
            overflow: hidden;
        }
        .sd-hero::before {
            content: "";
            position: absolute;
            top: -40%;
            right: -15%;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(22, 87, 179, .08), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .sd-hero-row {
            display: flex;
            align-items: center;
            gap: 40px;
            position: relative;
            z-index: 2;
        }
        .sd-hero-text {
            flex: 0 0 55%;
        }
        .sd-hero-image {
            flex: 0 0 45%;
            position: relative;
            min-height: 340px;
        }
        .sd-hero-image .sd-hero-img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            border-radius: var(--sd-radius-lg);
            box-shadow: var(--sd-shadow-card-hover);
        }
        .sd-hero-badge {
            display: inline-block;
            background: rgba(22, 87, 179, .08);
            color: var(--sd-primary);
            font-weight: 600;
            font-size: 13px;
            padding: 6px 14px;
            border-radius: 30px;
            margin-bottom: 18px;
            letter-spacing: .5px;
        }
        .sd-hero h1 {
            margin-bottom: 18px;
            color: var(--sd-text-strong);
        }
        .sd-hero-subtitle {
            font-size: 17px;
            font-weight: 500;
            color: var(--sd-primary);
            margin-bottom: 18px;
            letter-spacing: .2px;
        }
        .sd-hero-desc {
            font-size: 15px;
            color: var(--sd-text);
            line-height: 1.85;
            margin-bottom: 26px;
            max-width: 520px;
        }
        .sd-hero-cta {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .sd-hero-speedline {
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            pointer-events: none;
            z-index: 1;
            opacity: .35;
        }
        .sd-hero-speedline span {
            position: absolute;
            display: block;
            height: 1px;
            width: 120px;
            background: linear-gradient(90deg, transparent, rgba(22, 87, 179, .25), transparent);
            transform: rotate(28deg);
        }
        .sd-hero-speedline span:nth-child(1) { top: 18%; right: 8%; }
        .sd-hero-speedline span:nth-child(2) { top: 42%; right: 2%; width: 180px; }
        .sd-hero-speedline span:nth-child(3) { top: 68%; right: 12%; width: 100px; }

        /* Buttons */
        .sd-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            border-radius: var(--sd-radius-sm);
            padding: 10px 22px;
            border: 1.5px solid transparent;
            cursor: pointer;
            transition: all var(--sd-transition);
            line-height: 1.4;
            text-decoration: none;
        }
        .sd-btn-primary {
            background: var(--sd-primary);
            color: #fff;
            border-color: var(--sd-primary);
        }
        .sd-btn-primary:hover {
            background: var(--sd-primary-dark);
            border-color: var(--sd-primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 18px rgba(22, 87, 179, .2);
        }
        .sd-btn-outline {
            background: #fff;
            color: var(--sd-primary);
            border-color: var(--sd-primary);
        }
        .sd-btn-outline:hover {
            background: rgba(22, 87, 179, .06);
            color: var(--sd-primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 18px rgba(22, 87, 179, .12);
        }
        .sd-btn-accent {
            background: var(--sd-accent);
            color: #fff;
            border-color: var(--sd-accent);
        }
        .sd-btn-accent:hover {
            background: var(--sd-accent-dark);
            border-color: var(--sd-accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 18px rgba(245, 158, 27, .24);
        }
        .sd-btn-sm {
            padding: 7px 15px;
            font-size: 13px;
        }
        .sd-btn-lg {
            padding: 12px 28px;
            font-size: 16px;
        }

        /* Section Base */
        .sd-section {
            padding: var(--sd-section-gap) 0;
        }
        .sd-section-alt {
            background: #fff;
        }
        .sd-section-heading {
            margin-bottom: 36px;
        }
        .sd-section-heading h2 {
            margin-bottom: 12px;
        }
        .sd-section-heading p {
            color: var(--sd-text-muted);
            max-width: 720px;
            margin-bottom: 0;
            font-size: 15px;
        }
        .sd-section-heading.center {
            text-align: center;
        }
        .sd-section-heading.center p {
            margin-left: auto;
            margin-right: auto;
        }

        /* Cards */
        .sd-card {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            box-shadow: var(--sd-shadow-card);
            transition: all var(--sd-transition);
            height: 100%;
        }
        .sd-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--sd-shadow-card-hover);
        }
        .sd-card-body {
            padding: 22px;
        }
        .sd-card-title {
            font-size: 19px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin-bottom: 10px;
        }
        .sd-card-text {
            color: var(--sd-text-muted);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .sd-card-link {
            font-weight: 600;
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--sd-primary);
        }
        .sd-card-link:hover {
            color: var(--sd-primary-dark);
        }

        /* Service Matrix Cards */
        .sd-service-card {
            border-top: 8px solid var(--sd-primary);
            padding-top: 0;
        }
        .sd-service-card .sd-card-body {
            padding-top: 18px;
        }

        /* Stats Bar */
        .sd-stats-section {
            background: linear-gradient(135deg, #0F3E88 0%, #1752B0 55%, #1D5CC4 100%);
            padding: 52px 0;
        }
        .sd-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .sd-stat-number {
            font-family: var(--sd-font-mono);
            font-size: 40px;
            font-weight: 700;
            color: #fff;
            line-height: 1.2;
            letter-spacing: -1px;
        }
        .sd-stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, .75);
            margin-top: 6px;
        }

        /* Steps */
        .sd-steps {
            position: relative;
        }
        .sd-steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .sd-step-item {
            text-align: center;
            position: relative;
        }
        .sd-step-number {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--sd-primary);
            color: #fff;
            font-weight: 700;
            font-size: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 6px 16px rgba(22, 87, 179, .24);
            transition: transform var(--sd-transition);
        }
        .sd-step-item:hover .sd-step-number {
            transform: scale(1.12);
        }
        .sd-step-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin-bottom: 8px;
        }
        .sd-step-desc {
            font-size: 13px;
            color: var(--sd-text-muted);
            line-height: 1.7;
        }
        .sd-steps-line {
            position: absolute;
            top: 26px;
            left: 12%;
            right: 12%;
            height: 1px;
            background: var(--sd-border);
            z-index: 0;
        }
        .sd-step-item {
            z-index: 2;
        }

        /* Case Cards */
        .sd-case-card {
            border-radius: var(--sd-radius-md);
            overflow: hidden;
            position: relative;
            color: #fff;
            min-height: 260px;
            display: flex;
            align-items: flex-end;
            box-shadow: var(--sd-shadow-card);
            transition: all var(--sd-transition);
        }
        .sd-case-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--sd-shadow-card-hover);
        }
        .sd-case-card img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 0;
        }
        .sd-case-card-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(180deg, rgba(22, 35, 59, .15) 0%, rgba(22, 35, 59, .75) 75%);
            z-index: 1;
        }
        .sd-case-card-content {
            position: relative;
            z-index: 2;
            padding: 22px;
            width: 100%;
        }
        .sd-case-tag {
            display: inline-block;
            background: var(--sd-accent);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: 10px;
        }
        .sd-case-title {
            font-size: 19px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .sd-case-desc {
            font-size: 13px;
            color: rgba(255, 255, 255, .85);
            line-height: 1.7;
            margin-bottom: 10px;
        }
        .sd-case-date {
            font-size: 12px;
            color: rgba(255, 255, 255, .65);
            font-family: var(--sd-font-mono);
        }

        /* News List */
        .sd-news-list {
            display: flex;
            flex-direction: column;
        }
        .sd-news-item {
            display: flex;
            gap: 18px;
            padding: 20px 0;
            border-bottom: 1px solid var(--sd-divider);
            align-items: flex-start;
        }
        .sd-news-item:first-child {
            border-top: 1px solid var(--sd-divider);
        }
        .sd-news-date {
            flex-shrink: 0;
            font-family: var(--sd-font-mono);
            font-size: 14px;
            font-weight: 600;
            color: var(--sd-primary);
            min-width: 90px;
            padding-top: 4px;
        }
        .sd-news-content {
            flex: 1;
        }
        .sd-news-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin-bottom: 8px;
            line-height: 1.45;
        }
        .sd-news-desc {
            font-size: 14px;
            color: var(--sd-text-muted);
            line-height: 1.7;
            margin-bottom: 10px;
        }
        .sd-news-btn {
            font-size: 13px;
            font-weight: 600;
            color: var(--sd-primary);
            padding: 6px 14px;
            border: 1.5px solid var(--sd-primary);
            border-radius: var(--sd-radius-sm);
            background: transparent;
            transition: all var(--sd-transition);
            display: inline-block;
        }
        .sd-news-btn:hover {
            background: rgba(22, 87, 179, .06);
            color: var(--sd-primary-dark);
        }

        /* Brand Section */
        .sd-brand-section {
            background: #fff;
            padding: var(--sd-section-gap) 0;
        }
        .sd-brand-row {
            display: flex;
            align-items: center;
            gap: 40px;
        }
        .sd-brand-image {
            flex: 0 0 45%;
        }
        .sd-brand-image img {
            border-radius: var(--sd-radius-lg);
            box-shadow: var(--sd-shadow-card);
            height: 360px;
            object-fit: cover;
            width: 100%;
        }
        .sd-brand-text {
            flex: 0 0 55%;
        }
        .sd-brand-text p {
            font-size: 15px;
            color: var(--sd-text);
            line-height: 1.9;
            margin-bottom: 14px;
        }

        /* Topic Cards */
        .sd-topic-card {
            border-radius: var(--sd-radius-lg);
            overflow: hidden;
            background: #fff;
            border: 1px solid var(--sd-border);
            box-shadow: var(--sd-shadow-card);
            transition: all var(--sd-transition);
            height: 100%;
        }
        .sd-topic-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--sd-shadow-card-hover);
        }
        .sd-topic-image {
            height: 220px;
            overflow: hidden;
        }
        .sd-topic-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .3s ease;
        }
        .sd-topic-card:hover .sd-topic-image img {
            transform: scale(1.04);
        }
        .sd-topic-body {
            padding: 20px 22px;
        }
        .sd-topic-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin-bottom: 8px;
        }
        .sd-topic-desc {
            font-size: 14px;
            color: var(--sd-text-muted);
            line-height: 1.7;
            margin-bottom: 14px;
        }
        .sd-topic-link {
            font-weight: 600;
            font-size: 14px;
            color: var(--sd-primary);
        }

        /* Partners */
        .sd-partner-wall {
            display: flex;
            gap: 18px;
            overflow-x: auto;
            padding-bottom: 8px;
            scrollbar-width: thin;
            scrollbar-color: var(--sd-border) transparent;
        }
        .sd-partner-item {
            flex: 0 0 auto;
            width: 160px;
            height: 70px;
            background: #fff;
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            color: var(--sd-text-muted);
            font-size: 14px;
            transition: all var(--sd-transition);
            cursor: pointer;
        }
        .sd-partner-item:hover {
            border-color: var(--sd-primary);
            color: var(--sd-primary);
            box-shadow: 0 4px 12px rgba(22, 87, 179, .1);
        }

        /* FAQ */
        .sd-faq {
            background: #fff;
        }
        .sd-faq-accordion {
            max-width: 860px;
            margin: 0 auto;
        }
        .sd-faq-item {
            background: #fff;
            border: 1px solid var(--sd-border);
            border-left: 4px solid var(--sd-primary);
            border-radius: var(--sd-radius-sm);
            margin-bottom: 14px;
            transition: all var(--sd-transition);
            overflow: hidden;
        }
        .sd-faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            color: var(--sd-text-strong);
            text-align: left;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            transition: color var(--sd-transition);
            gap: 16px;
        }
        .sd-faq-question:hover {
            color: var(--sd-primary);
        }
        .sd-faq-icon {
            flex-shrink: 0;
            transition: transform var(--sd-transition);
            color: var(--sd-primary);
        }
        .sd-faq-item.open .sd-faq-icon {
            transform: rotate(180deg);
        }
        .sd-faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .25s ease;
            padding: 0 22px;
        }
        .sd-faq-item.open .sd-faq-answer {
            max-height: 300px;
            padding: 0 22px 20px;
        }
        .sd-faq-answer p {
            font-size: 14px;
            color: var(--sd-text-muted);
            line-height: 1.8;
            margin-bottom: 0;
            background: var(--sd-bg);
            border-radius: 6px;
            padding: 14px 16px;
        }

        /* Guarantee Bar */
        .sd-guarantee-section {
            background: linear-gradient(135deg, #E6F0FF 0%, #F5F9FF 100%);
            border-top: 1px solid var(--sd-border);
            border-bottom: 1px solid var(--sd-border);
        }
        .sd-guarantee-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            text-align: center;
        }
        .sd-guarantee-icon {
            font-size: 32px;
            color: var(--sd-primary);
            margin-bottom: 14px;
        }
        .sd-guarantee-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin-bottom: 8px;
        }
        .sd-guarantee-desc {
            font-size: 13px;
            color: var(--sd-text-muted);
            line-height: 1.7;
        }

        /* CTA Section */
        .sd-cta-section {
            background: #0F1523;
            padding: 56px 0;
            border-radius: var(--sd-radius-lg);
            margin: var(--sd-section-gap) 0;
            box-shadow: 0 16px 40px rgba(15, 21, 35, .2);
        }
        .sd-cta-row {
            display: flex;
            align-items: center;
            gap: 40px;
        }
        .sd-cta-text {
            flex: 0 0 55%;
            color: #fff;
        }
        .sd-cta-text h2 {
            color: #fff;
            font-size: 28px;
            margin-bottom: 12px;
        }
        .sd-cta-text p {
            color: rgba(255, 255, 255, .75);
            font-size: 14px;
            line-height: 1.8;
        }
        .sd-cta-info {
            flex: 0 0 45%;
            background: rgba(255, 255, 255, .06);
            border-radius: var(--sd-radius-md);
            padding: 24px;
            color: #fff;
        }
        .sd-cta-info-item {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
            font-size: 14px;
            color: rgba(255, 255, 255, .85);
        }
        .sd-cta-info-item:last-child {
            margin-bottom: 0;
        }
        .sd-cta-info-item i {
            color: var(--sd-accent);
            font-size: 18px;
            width: 22px;
            text-align: center;
        }

        /* Tags */
        .sd-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
        }
        .sd-tag {
            display: inline-block;
            padding: 8px 18px;
            background: #fff;
            border: 1px solid var(--sd-border);
            border-radius: 30px;
            font-size: 13px;
            color: var(--sd-text);
            font-weight: 500;
            transition: all var(--sd-transition);
        }
        .sd-tag:hover {
            background: var(--sd-primary);
            border-color: var(--sd-primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 14px rgba(22, 87, 179, .18);
        }

        /* Subscribe */
        .sd-subscribe {
            background: #fff;
            border-radius: var(--sd-radius-md);
            box-shadow: var(--sd-shadow-card);
            padding: 28px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }
        .sd-subscribe-left {
            flex: 1;
        }
        .sd-subscribe-title {
            font-size: 20px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin-bottom: 6px;
        }
        .sd-subscribe-desc {
            font-size: 14px;
            color: var(--sd-text-muted);
        }
        .sd-subscribe-form {
            display: flex;
            gap: 10px;
            flex: 0 0 340px;
        }
        .sd-subscribe-input {
            flex: 1;
            border: 1.5px solid var(--sd-border);
            border-radius: var(--sd-radius-sm);
            padding: 10px 16px;
            font-size: 14px;
            font-family: var(--sd-font-sans);
            transition: all var(--sd-transition);
            background: #fff;
            color: var(--sd-text-strong);
        }
        .sd-subscribe-input:focus {
            outline: none;
            border-color: var(--sd-primary);
            box-shadow: 0 0 0 3px rgba(22, 87, 179, .12);
        }

        /* Footer */
        .sd-footer {
            background: #0F1523;
            color: #fff;
            padding: 56px 0 28px;
            margin-top: var(--sd-section-gap);
        }
        .sd-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 36px;
        }
        .sd-footer-brand {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 14px;
        }
        .sd-footer-brand:hover {
            color: #fff;
            opacity: .9;
        }
        .sd-footer-desc {
            font-size: 13px;
            color: rgba(255, 255, 255, .6);
            line-height: 1.8;
            max-width: 300px;
            margin-bottom: 16px;
        }
        .sd-footer-social {
            display: flex;
            gap: 12px;
        }
        .sd-footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, .08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            transition: all var(--sd-transition);
        }
        .sd-footer-social a:hover {
            background: var(--sd-primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .sd-footer-heading {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .sd-footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sd-footer-links li {
            margin-bottom: 10px;
        }
        .sd-footer-links a {
            color: rgba(255, 255, 255, .65);
            font-size: 13px;
            transition: color var(--sd-transition);
        }
        .sd-footer-links a:hover {
            color: #fff;
        }
        .sd-footer-contact {
            list-style: none;
            padding: 0;
            margin: 0;
            font-size: 13px;
            color: rgba(255, 255, 255, .65);
        }
        .sd-footer-contact li {
            margin-bottom: 10px;
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .sd-footer-contact i {
            color: var(--sd-accent);
            font-size: 16px;
            width: 20px;
            margin-top: 2px;
        }
        .sd-footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .08);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, .5);
        }
        .sd-footer-bottom a {
            color: rgba(255, 255, 255, .6);
            font-size: 13px;
        }
        .sd-footer-bottom a:hover {
            color: #fff;
        }

        /* Responsive */
        @media (max-width: 1199px) {
            .sd-container { max-width: 100%; }
            h1 { font-size: 36px; }
            h2 { font-size: 27px; }
        }
        @media (max-width: 991px) {
            .sd-nav-left,
            .sd-nav-right { display: none; }
            .sd-hamburger { display: block; }
            .sd-header { height: var(--sd-nav-height-mobile); }
            .sd-header-inner { position: relative; }
            .sd-logo-wrap { position: absolute; left: 50%; transform: translateX(-50%); }
            .sd-mobile-menu { display: block; }
            .sd-hero-row { flex-direction: column; }
            .sd-hero-text,
            .sd-hero-image { flex: 0 0 100%; }
            .sd-hero-image .sd-hero-img { height: 280px; }
            .sd-stats-grid { grid-template-columns: repeat(2, 1fr); }
            .sd-steps-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
            .sd-steps-line { display: none; }
            .sd-brand-row,
            .sd-cta-row { flex-direction: column; }
            .sd-brand-image,
            .sd-brand-text,
            .sd-cta-text,
            .sd-cta-info { flex: 0 0 100%; }
            .sd-footer-grid { grid-template-columns: 1fr 1fr; }
            .sd-subscribe { flex-direction: column; align-items: flex-start; }
            .sd-subscribe-form { flex: 0 0 auto; width: 100%; }
        }
        @media (max-width: 767px) {
            h1 { font-size: 30px; }
            h2 { font-size: 24px; }
            .sd-section { padding: var(--sd-section-gap-mobile) 0; }
            .sd-guarantee-grid { grid-template-columns: 1fr; }
            .sd-news-item { flex-direction: column; gap: 8px; }
            .sd-news-date { min-width: auto; }
            .sd-footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .sd-footer-bottom { flex-direction: column; text-align: center; }
            .sd-hero { padding: 48px 0; }
        }
        @media (max-width: 575px) {
            .sd-card-body { padding: 18px; }
            .sd-stats-grid { gap: 16px; }
            .sd-stat-number { font-size: 32px; }
            .sd-steps-grid { grid-template-columns: 1fr; }
            .sd-tags { gap: 8px; }
            .sd-tag { padding: 6px 14px; font-size: 12px; }
            .sd-subscribe-input { min-width: 0; }
            .sd-subscribe-form { flex-direction: column; }
            .sd-hero-image .sd-hero-img { height: 220px; }
        }

/* roulang page: category2 */
:root {
            --sd-primary: #1752B0;
            --sd-primary-dark: #0F3E88;
            --sd-accent: #F59E1B;
            --sd-accent-dark: #D9820A;
            --sd-bg: #F6F8FB;
            --sd-surface: #FFFFFF;
            --sd-text-strong: #16233B;
            --sd-text: #3A4658;
            --sd-text-muted: #6B7790;
            --sd-text-disabled: #A0A8B8;
            --sd-border: #E5EAF2;
            --sd-divider: #EEF2F7;
            --sd-radius-sm: 8px;
            --sd-radius-md: 12px;
            --sd-radius-lg: 16px;
            --sd-shadow-card: 0 8px 28px rgba(22, 87, 179, .08);
            --sd-shadow-card-hover: 0 12px 32px rgba(22, 87, 179, .16);
            --sd-font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            --sd-font-mono: "Roboto Mono", "SFMono-Regular", monospace;
            --sd-nav-height: 72px;
            --sd-nav-height-mobile: 60px;
            --sd-section-gap: 72px;
            --sd-section-gap-mobile: 48px;
            --sd-break-xl: 1200px;
            --sd-break-lg: 992px;
            --sd-break-md: 768px;
            --sd-break-sm: 576px;
            --sd-transition: .18s ease;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--sd-font-sans);
            background-color: var(--sd-bg);
            color: var(--sd-text);
            font-size: 15px;
            line-height: 1.8;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            text-decoration: none;
            color: var(--sd-primary);
            transition: color var(--sd-transition);
        }

        a:hover {
            color: var(--sd-primary-dark);
        }

        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--sd-primary);
            outline-offset: 2px;
        }

        img {
            max-width: 100%;
            display: block;
        }

        .text-muted-2 {
            color: var(--sd-text-muted);
        }

        .sd-container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* Header / Navigation */
        .sd-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, .98);
            backdrop-filter: blur(10px);
            box-shadow: 0 1px 0 var(--sd-border), 0 6px 18px rgba(22, 87, 179, .04);
            height: var(--sd-nav-height);
            display: flex;
            align-items: center;
        }

        .sd-header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .sd-nav-left,
        .sd-nav-right {
            display: flex;
            align-items: center;
            gap: 26px;
            flex: 1;
        }

        .sd-nav-left {
            justify-content: flex-start;
        }

        .sd-nav-right {
            justify-content: flex-end;
        }

        .sd-logo-wrap {
            flex-shrink: 0;
            padding: 0 18px;
        }

        .sd-logo {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            font-weight: 800;
            font-size: 21px;
            color: var(--sd-text-strong);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }

        .sd-logo:hover {
            color: var(--sd-primary);
        }

        .sd-logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--sd-primary), #3A7BDE);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            box-shadow: 0 6px 16px rgba(22, 87, 179, .24);
        }

        .sd-nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--sd-text);
            padding: 6px 2px;
            position: relative;
            transition: color var(--sd-transition);
        }

        .sd-nav-link::after {
            content: "";
            position: absolute;
            left: 50%;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: var(--sd-primary);
            border-radius: 2px;
            transition: width .18s ease, left .18s ease;
        }

        .sd-nav-link:hover {
            color: var(--sd-primary);
        }

        .sd-nav-link:hover::after,
        .sd-nav-link.active::after {
            width: 100%;
            left: 0;
        }

        .sd-nav-link.active {
            color: var(--sd-primary);
            font-weight: 700;
        }

        .sd-hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--sd-text-strong);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }

        .sd-hamburger:hover {
            background: var(--sd-bg);
        }

        .sd-mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 300px;
            max-width: 80vw;
            height: 100vh;
            background: #fff;
            box-shadow: 8px 0 30px rgba(22, 87, 179, .12);
            z-index: 1100;
            padding: 24px 20px;
            transform: translateX(-100%);
            transition: transform .22s ease;
            overflow-y: auto;
        }

        .sd-mobile-menu.open {
            transform: translateX(0);
        }

        .sd-mobile-menu-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .sd-mobile-menu-close {
            background: none;
            border: none;
            font-size: 24px;
            color: var(--sd-text);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }

        .sd-mobile-nav-link {
            display: block;
            padding: 12px 0;
            font-size: 16px;
            font-weight: 500;
            color: var(--sd-text-strong);
            border-bottom: 1px solid var(--sd-divider);
            transition: color var(--sd-transition);
        }

        .sd-mobile-nav-link:hover {
            color: var(--sd-primary);
        }

        .sd-mobile-nav-link.active {
            color: var(--sd-primary);
            font-weight: 700;
        }

        .sd-mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(15, 21, 35, .45);
            z-index: 1050;
            opacity: 0;
            transition: opacity .22s ease;
        }

        .sd-mobile-overlay.show {
            opacity: 1;
        }

        /* Category Banner */
        .sd-cat-banner {
            padding: 40px 0 32px;
            background: var(--sd-surface);
            border-bottom: 1px solid var(--sd-border);
        }

        .sd-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--sd-text-muted);
            margin-bottom: 18px;
            flex-wrap: wrap;
        }

        .sd-breadcrumb a {
            color: var(--sd-text-muted);
            transition: color var(--sd-transition);
        }

        .sd-breadcrumb a:hover {
            color: var(--sd-primary);
        }

        .sd-breadcrumb .sep {
            color: var(--sd-text-disabled);
            font-size: 11px;
        }

        .sd-cat-banner-body {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        .sd-cat-banner-text {
            flex: 1;
        }

        .sd-cat-banner-text h1 {
            font-size: 32px;
            font-weight: 800;
            color: var(--sd-text-strong);
            margin: 0 0 12px;
            letter-spacing: -0.5px;
            line-height: 1.3;
        }

        .sd-cat-banner-text p {
            font-size: 15px;
            color: var(--sd-text-muted);
            margin: 0;
            max-width: 560px;
            line-height: 1.8;
        }

        .sd-cat-banner-img {
            width: 220px;
            height: 160px;
            border-radius: var(--sd-radius-md);
            overflow: hidden;
            flex-shrink: 0;
            box-shadow: var(--sd-shadow-card);
        }

        .sd-cat-banner-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Section common */
        .sd-section {
            padding: var(--sd-section-gap) 0;
        }

        .sd-section-title {
            font-size: 26px;
            font-weight: 800;
            color: var(--sd-text-strong);
            margin: 0 0 8px;
            letter-spacing: -0.4px;
            line-height: 1.35;
        }

        .sd-section-sub {
            font-size: 15px;
            color: var(--sd-text-muted);
            margin: 0 0 28px;
            max-width: 620px;
            line-height: 1.8;
        }

        /* Course cards grid */
        .sd-course-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .sd-course-card {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            overflow: hidden;
            box-shadow: var(--sd-shadow-card);
            transition: transform var(--sd-transition), box-shadow var(--sd-transition);
            display: flex;
            flex-direction: column;
        }

        .sd-course-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--sd-shadow-card-hover);
        }

        .sd-course-card-img {
            height: 200px;
            overflow: hidden;
            position: relative;
        }

        .sd-course-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .3s ease;
        }

        .sd-course-card:hover .sd-course-card-img img {
            transform: scale(1.03);
        }

        .sd-course-card-badge {
            position: absolute;
            top: 14px;
            left: 14px;
            background: var(--sd-accent);
            color: #fff;
            font-size: 12px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 20px;
            letter-spacing: 0.3px;
        }

        .sd-course-card-body {
            padding: 22px 22px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .sd-course-card-body h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin: 0 0 10px;
            line-height: 1.45;
            letter-spacing: -0.2px;
        }

        .sd-course-card-body h3 a {
            color: var(--sd-text-strong);
            transition: color var(--sd-transition);
        }

        .sd-course-card-body h3 a:hover {
            color: var(--sd-primary);
        }

        .sd-course-card-desc {
            font-size: 14px;
            color: var(--sd-text-muted);
            line-height: 1.8;
            margin: 0 0 16px;
            flex: 1;
        }

        .sd-course-card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--sd-text-muted);
            padding-top: 12px;
            border-top: 1px solid var(--sd-divider);
            flex-wrap: wrap;
        }

        .sd-course-card-meta span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        .sd-course-card-meta i {
            color: var(--sd-primary);
            font-size: 13px;
        }

        .sd-course-card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--sd-primary);
            transition: color var(--sd-transition);
        }

        .sd-course-card-link:hover {
            color: var(--sd-primary-dark);
        }

        .sd-course-card-link i {
            font-size: 13px;
            transition: transform var(--sd-transition);
        }

        .sd-course-card-link:hover i {
            transform: translateX(3px);
        }

        /* Category entries */
        .sd-cat-entries {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .sd-cat-entry {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            padding: 18px 16px;
            text-align: center;
            transition: transform var(--sd-transition), box-shadow var(--sd-transition), border-color var(--sd-transition);
            display: block;
        }

        .sd-cat-entry:hover {
            transform: translateY(-3px);
            box-shadow: var(--sd-shadow-card);
            border-color: var(--sd-primary);
            color: var(--sd-primary);
        }

        .sd-cat-entry i {
            font-size: 24px;
            color: var(--sd-primary);
            margin-bottom: 8px;
            display: block;
        }

        .sd-cat-entry span {
            font-size: 14px;
            font-weight: 600;
            color: var(--sd-text-strong);
            display: block;
        }

        .sd-cat-entry:hover span {
            color: var(--sd-primary);
        }

        /* Stats */
        .sd-stats-bar {
            background: linear-gradient(135deg, var(--sd-primary-dark), var(--sd-primary));
            border-radius: var(--sd-radius-lg);
            padding: 28px 32px;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            box-shadow: 0 12px 32px rgba(22, 87, 179, .18);
        }

        .sd-stat-item {
            text-align: center;
            padding: 12px 8px;
        }

        .sd-stat-number {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            font-family: var(--sd-font-mono);
            letter-spacing: -0.5px;
            line-height: 1.2;
        }

        .sd-stat-label {
            font-size: 13px;
            color: rgba(255, 255, 255, .75);
            margin-top: 4px;
            font-weight: 500;
        }

        /* Tags */
        .sd-tags-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .sd-tag {
            display: inline-block;
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: 20px;
            padding: 6px 16px;
            font-size: 13px;
            color: var(--sd-text);
            transition: background var(--sd-transition), color var(--sd-transition), border-color var(--sd-transition);
        }

        .sd-tag:hover {
            background: var(--sd-primary);
            color: #fff;
            border-color: var(--sd-primary);
        }

        /* Topic cards */
        .sd-topic-cards {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .sd-topic-card {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            overflow: hidden;
            box-shadow: var(--sd-shadow-card);
            transition: transform var(--sd-transition), box-shadow var(--sd-transition);
        }

        .sd-topic-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--sd-shadow-card-hover);
        }

        .sd-topic-card-img {
            height: 180px;
            overflow: hidden;
        }

        .sd-topic-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .sd-topic-card-body {
            padding: 18px 20px;
        }

        .sd-topic-card-body h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin: 0 0 8px;
            line-height: 1.45;
        }

        .sd-topic-card-body p {
            font-size: 13px;
            color: var(--sd-text-muted);
            margin: 0 0 14px;
            line-height: 1.7;
        }

        .sd-topic-card-link {
            font-size: 13px;
            font-weight: 600;
            color: var(--sd-primary);
            display: inline-flex;
            align-items: center;
            gap: 5px;
            transition: color var(--sd-transition);
        }

        .sd-topic-card-link:hover {
            color: var(--sd-primary-dark);
        }

        /* Subscribe */
        .sd-subscribe-card {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-lg);
            padding: 32px 36px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            box-shadow: var(--sd-shadow-card);
            flex-wrap: wrap;
        }

        .sd-subscribe-text h2 {
            font-size: 22px;
            font-weight: 800;
            color: var(--sd-text-strong);
            margin: 0 0 6px;
            letter-spacing: -0.3px;
        }

        .sd-subscribe-text p {
            font-size: 14px;
            color: var(--sd-text-muted);
            margin: 0;
        }

        .sd-subscribe-form {
            display: flex;
            gap: 10px;
            flex-shrink: 0;
        }

        .sd-subscribe-form input {
            width: 260px;
            padding: 10px 16px;
            font-size: 14px;
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-sm);
            background: #fff;
            color: var(--sd-text);
            transition: border-color var(--sd-transition), box-shadow var(--sd-transition);
        }

        .sd-subscribe-form input:focus {
            border-color: var(--sd-primary);
            box-shadow: 0 0 0 3px rgba(22, 87, 179, .12);
            outline: none;
        }

        .sd-subscribe-form button {
            background: var(--sd-accent);
            color: #fff;
            border: none;
            border-radius: var(--sd-radius-sm);
            padding: 10px 22px;
            font-size: 14px;
            font-weight: 700;
            cursor: pointer;
            transition: background var(--sd-transition);
            white-space: nowrap;
        }

        .sd-subscribe-form button:hover {
            background: var(--sd-accent-dark);
        }

        /* FAQ */
        .sd-faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 820px;
        }

        .sd-faq-item {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            overflow: hidden;
            box-shadow: var(--sd-shadow-card);
        }

        .sd-faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            background: none;
            border: none;
            font-size: 15px;
            font-weight: 700;
            color: var(--sd-text-strong);
            cursor: pointer;
            text-align: left;
            gap: 12px;
            transition: color var(--sd-transition);
        }

        .sd-faq-question:hover {
            color: var(--sd-primary);
        }

        .sd-faq-question i {
            flex-shrink: 0;
            font-size: 14px;
            color: var(--sd-primary);
            transition: transform var(--sd-transition);
        }

        .sd-faq-question i.fa-chevron-down {
            transform: rotate(0deg);
        }

        .sd-faq-item.open .sd-faq-question i.fa-chevron-down {
            transform: rotate(180deg);
        }

        .sd-faq-answer {
            display: none;
            padding: 0 20px 16px;
            font-size: 14px;
            color: var(--sd-text-muted);
            line-height: 1.8;
            border-top: 1px solid var(--sd-divider);
            padding-top: 12px;
        }

        .sd-faq-item.open .sd-faq-answer {
            display: block;
        }

        /* Expert recommendation */
        .sd-expert-card {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-lg);
            padding: 28px 32px;
            display: flex;
            align-items: center;
            gap: 24px;
            box-shadow: var(--sd-shadow-card);
            flex-wrap: wrap;
        }

        .sd-expert-avatar {
            width: 72px;
            height: 72px;
            background: linear-gradient(135deg, var(--sd-primary), #3A7BDE);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 30px;
            flex-shrink: 0;
        }

        .sd-expert-content {
            flex: 1;
            min-width: 200px;
        }

        .sd-expert-content h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin: 0 0 6px;
        }

        .sd-expert-content p {
            font-size: 14px;
            color: var(--sd-text-muted);
            margin: 0 0 10px;
            line-height: 1.8;
        }

        .sd-expert-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--sd-primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color var(--sd-transition);
        }

        .sd-expert-link:hover {
            color: var(--sd-primary-dark);
        }

        /* View more button */
        .sd-view-more {
            text-align: center;
        }

        .sd-btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            border: 1.5px solid var(--sd-primary);
            color: var(--sd-primary);
            border-radius: var(--sd-radius-sm);
            padding: 10px 26px;
            font-size: 14px;
            font-weight: 700;
            transition: background var(--sd-transition), color var(--sd-transition);
        }

        .sd-btn-outline:hover {
            background: var(--sd-primary);
            color: #fff;
        }

        /* Footer */
        .sd-footer {
            background: #0F1523;
            color: rgba(255, 255, 255, .78);
            padding: 48px 0 24px;
            margin-top: 0;
        }

        .sd-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .sd-footer-brand {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            font-weight: 800;
            font-size: 20px;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.3px;
        }

        .sd-footer-brand:hover {
            color: #fff;
        }

        .sd-footer-desc {
            font-size: 13px;
            color: rgba(255, 255, 255, .6);
            line-height: 1.8;
            margin: 0 0 16px;
            max-width: 300px;
        }

        .sd-footer-social {
            display: flex;
            gap: 10px;
        }

        .sd-footer-social a {
            width: 36px;
            height: 36px;
            background: rgba(255, 255, 255, .08);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, .7);
            font-size: 16px;
            transition: background var(--sd-transition), color var(--sd-transition);
        }

        .sd-footer-social a:hover {
            background: var(--sd-primary);
            color: #fff;
        }

        .sd-footer-heading {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.2px;
        }

        .sd-footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .sd-footer-links li {
            margin-bottom: 8px;
        }

        .sd-footer-links a {
            font-size: 13px;
            color: rgba(255, 255, 255, .6);
            transition: color var(--sd-transition);
        }

        .sd-footer-links a:hover {
            color: #fff;
        }

        .sd-footer-contact {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .sd-footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, .6);
            margin-bottom: 8px;
            line-height: 1.6;
        }

        .sd-footer-contact i {
            color: var(--sd-primary);
            font-size: 14px;
            margin-top: 2px;
            flex-shrink: 0;
        }

        .sd-footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 18px;
            border-top: 1px solid rgba(255, 255, 255, .08);
            font-size: 13px;
            color: rgba(255, 255, 255, .45);
            flex-wrap: wrap;
            gap: 10px;
        }

        .sd-footer-bottom a {
            color: rgba(255, 255, 255, .55);
            transition: color var(--sd-transition);
        }

        .sd-footer-bottom a:hover {
            color: #fff;
        }

        /* Responsive */
        @media (max-width: 991.98px) {
            .sd-nav-left,
            .sd-nav-right {
                display: none;
            }
            .sd-hamburger {
                display: block;
            }
            .sd-logo-wrap {
                margin: 0 auto;
                padding: 0;
            }
            .sd-mobile-menu {
                display: block;
            }
            .sd-mobile-overlay {
                display: block;
            }
            .sd-cat-banner-img {
                width: 160px;
                height: 130px;
            }
            .sd-cat-banner-text h1 {
                font-size: 26px;
            }
            .sd-stats-bar {
                grid-template-columns: repeat(2, 1fr);
                padding: 20px 24px;
            }
            .sd-stat-number {
                font-size: 26px;
            }
            .sd-cat-entries {
                grid-template-columns: repeat(2, 1fr);
            }
            .sd-topic-cards {
                grid-template-columns: repeat(2, 1fr);
            }
            .sd-footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 767.98px) {
            .sd-section {
                padding: 48px 0;
            }
            .sd-section-title {
                font-size: 22px;
            }
            .sd-cat-banner {
                padding: 28px 0 24px;
            }
            .sd-cat-banner-body {
                flex-direction: column;
                align-items: flex-start;
                gap: 16px;
            }
            .sd-cat-banner-img {
                width: 100%;
                height: 180px;
            }
            .sd-course-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .sd-course-card-img {
                height: 180px;
            }
            .sd-stats-bar {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
                padding: 18px 16px;
            }
            .sd-stat-number {
                font-size: 22px;
            }
            .sd-topic-cards {
                grid-template-columns: 1fr;
            }
            .sd-subscribe-card {
                flex-direction: column;
                align-items: flex-start;
                padding: 24px 20px;
            }
            .sd-subscribe-form {
                width: 100%;
                flex-direction: column;
            }
            .sd-subscribe-form input {
                width: 100%;
            }
            .sd-subscribe-form button {
                width: 100%;
            }
            .sd-expert-card {
                flex-direction: column;
                align-items: flex-start;
                padding: 22px 20px;
            }
            .sd-footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 575.98px) {
            .sd-cat-banner-text h1 {
                font-size: 22px;
            }
            .sd-cat-banner-img {
                height: 150px;
            }
            .sd-course-card-img {
                height: 160px;
            }
            .sd-stats-bar {
                grid-template-columns: 1fr 1fr;
                padding: 14px 10px;
            }
            .sd-stat-number {
                font-size: 20px;
            }
            .sd-cat-entries {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .sd-cat-entry {
                padding: 14px 10px;
            }
            .sd-cat-entry i {
                font-size: 20px;
            }
            .sd-topic-card-img {
                height: 150px;
            }
            .sd-footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

/* roulang page: category1 */
:root {
            --sd-primary: #1752B0;
            --sd-primary-dark: #0F3E88;
            --sd-primary-light: #E8F0FB;
            --sd-accent: #F59E1B;
            --sd-accent-dark: #D9820A;
            --sd-bg: #F6F8FB;
            --sd-surface: #FFFFFF;
            --sd-text-strong: #16233B;
            --sd-text: #3A4658;
            --sd-text-muted: #6B7790;
            --sd-text-disabled: #A0A8B8;
            --sd-border: #E5EAF2;
            --sd-divider: #EEF2F7;
            --sd-radius-sm: 8px;
            --sd-radius-md: 12px;
            --sd-radius-lg: 16px;
            --sd-shadow-card: 0 8px 28px rgba(22, 87, 179, .08);
            --sd-shadow-card-hover: 0 12px 32px rgba(22, 87, 179, .16);
            --sd-shadow-deep: 0 16px 44px rgba(22, 87, 179, .12);
            --sd-font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            --sd-font-mono: "Roboto Mono", "SFMono-Regular", monospace;
            --sd-nav-height: 72px;
            --sd-nav-height-mobile: 60px;
            --sd-section-gap: 72px;
            --sd-section-gap-mobile: 48px;
            --sd-break-xl: 1200px;
            --sd-break-lg: 992px;
            --sd-break-md: 768px;
            --sd-break-sm: 576px;
            --sd-transition: .18s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--sd-font-sans);
            background-color: var(--sd-bg);
            color: var(--sd-text);
            font-size: 15px;
            line-height: 1.8;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            text-decoration: none;
            color: var(--sd-primary);
            transition: color var(--sd-transition);
        }
        a:hover {
            color: var(--sd-primary-dark);
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--sd-primary);
            outline-offset: 2px;
        }
        img {
            max-width: 100%;
            display: block;
        }
        .text-muted-2 {
            color: var(--sd-text-muted);
        }
        .sd-container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        .sd-section {
            padding-top: var(--sd-section-gap);
            padding-bottom: var(--sd-section-gap);
        }
        .sd-section-alt {
            background: var(--sd-surface);
        }
        .sd-section-tight {
            padding-top: 40px;
            padding-bottom: 40px;
        }
        .sd-h2 {
            font-size: 28px;
            font-weight: 800;
            color: var(--sd-text-strong);
            letter-spacing: -0.3px;
            line-height: 1.3;
            margin-bottom: 12px;
        }
        .sd-h2-sub {
            font-size: 15px;
            color: var(--sd-text-muted);
            margin-bottom: 28px;
            line-height: 1.8;
            max-width: 640px;
        }
        .sd-h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--sd-text-strong);
            line-height: 1.4;
            margin-bottom: 8px;
        }
        .sd-section-header {
            margin-bottom: 30px;
        }
        .sd-section-header .sd-h2 {
            margin-bottom: 6px;
        }
        /* Header / Navigation */
        .sd-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, .98);
            backdrop-filter: blur(10px);
            box-shadow: 0 1px 0 var(--sd-border), 0 6px 18px rgba(22, 87, 179, .04);
            height: var(--sd-nav-height);
            display: flex;
            align-items: center;
        }
        .sd-header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .sd-nav-left,
        .sd-nav-right {
            display: flex;
            align-items: center;
            gap: 26px;
            flex: 1;
        }
        .sd-nav-left {
            justify-content: flex-start;
        }
        .sd-nav-right {
            justify-content: flex-end;
        }
        .sd-logo-wrap {
            flex-shrink: 0;
            padding: 0 18px;
        }
        .sd-logo {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            font-weight: 800;
            font-size: 21px;
            color: var(--sd-text-strong);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .sd-logo:hover {
            color: var(--sd-primary);
        }
        .sd-logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--sd-primary), #3A7BDE);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            box-shadow: 0 6px 16px rgba(22, 87, 179, .24);
        }
        .sd-nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--sd-text);
            padding: 6px 2px;
            position: relative;
            transition: color var(--sd-transition);
        }
        .sd-nav-link::after {
            content: "";
            position: absolute;
            left: 50%;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: var(--sd-primary);
            border-radius: 2px;
            transition: width .18s ease, left .18s ease;
        }
        .sd-nav-link:hover {
            color: var(--sd-primary);
        }
        .sd-nav-link:hover::after,
        .sd-nav-link.active::after {
            width: 100%;
            left: 0;
        }
        .sd-nav-link.active {
            color: var(--sd-primary);
            font-weight: 700;
        }
        .sd-hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--sd-text-strong);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }
        .sd-hamburger:hover {
            background: var(--sd-bg);
        }
        .sd-mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 300px;
            max-width: 80vw;
            height: 100vh;
            background: #fff;
            box-shadow: 8px 0 30px rgba(22, 87, 179, .12);
            z-index: 1100;
            padding: 24px 20px;
            transform: translateX(-100%);
            transition: transform .22s ease;
            overflow-y: auto;
        }
        .sd-mobile-menu.open {
            transform: translateX(0);
        }
        .sd-mobile-menu-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 24px;
        }
        .sd-mobile-menu-header .sd-logo {
            font-size: 19px;
        }
        .sd-mobile-close {
            background: none;
            border: none;
            font-size: 28px;
            color: var(--sd-text-muted);
            cursor: pointer;
            padding: 4px 8px;
        }
        .sd-mobile-menu-links {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sd-mobile-menu-links a {
            display: block;
            padding: 12px 10px;
            font-size: 16px;
            font-weight: 500;
            color: var(--sd-text-strong);
            border-radius: 8px;
            transition: all var(--sd-transition);
        }
        .sd-mobile-menu-links a:hover,
        .sd-mobile-menu-links a.active {
            background: var(--sd-primary-light);
            color: var(--sd-primary);
        }
        .sd-mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(22, 35, 59, .35);
            z-index: 1080;
            opacity: 0;
            transition: opacity .22s ease;
        }
        .sd-mobile-overlay.show {
            opacity: 1;
        }
        /* Breadcrumb */
        .sd-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--sd-text-muted);
            margin-bottom: 14px;
            flex-wrap: wrap;
        }
        .sd-breadcrumb a {
            color: var(--sd-text-muted);
            transition: color var(--sd-transition);
        }
        .sd-breadcrumb a:hover {
            color: var(--sd-primary);
        }
        .sd-breadcrumb .sep {
            color: var(--sd-text-disabled);
            font-size: 11px;
        }
        .sd-breadcrumb .current {
            color: var(--sd-text);
            font-weight: 600;
        }
        /* Buttons */
        .sd-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--sd-radius-sm);
            font-size: 15px;
            font-weight: 600;
            line-height: 1.5;
            border: 1.5px solid transparent;
            cursor: pointer;
            transition: all var(--sd-transition);
            white-space: nowrap;
        }
        .sd-btn-primary {
            background: var(--sd-primary);
            color: #fff;
            border-color: var(--sd-primary);
        }
        .sd-btn-primary:hover {
            background: var(--sd-primary-dark);
            border-color: var(--sd-primary-dark);
            color: #fff;
        }
        .sd-btn-outline {
            background: #fff;
            color: var(--sd-primary);
            border-color: var(--sd-primary);
        }
        .sd-btn-outline:hover {
            background: var(--sd-primary-light);
            color: var(--sd-primary);
        }
        .sd-btn-accent {
            background: var(--sd-accent);
            color: #fff;
            border-color: var(--sd-accent);
        }
        .sd-btn-accent:hover {
            background: var(--sd-accent-dark);
            border-color: var(--sd-accent-dark);
            color: #fff;
        }
        .sd-btn-sm {
            padding: 7px 14px;
            font-size: 13px;
            border-radius: 6px;
        }
        .sd-btn-lg {
            padding: 13px 28px;
            font-size: 16px;
            border-radius: 10px;
        }
        /* Banner */
        .sd-cat-banner {
            background: linear-gradient(180deg, #EEF4FC 0%, #F6F8FB 100%);
            padding: 40px 0 32px;
            border-bottom: 1px solid var(--sd-divider);
        }
        .sd-cat-banner-inner {
            display: grid;
            grid-template-columns: 1fr 260px;
            gap: 32px;
            align-items: center;
        }
        .sd-cat-banner-text .sd-h1 {
            font-size: 38px;
            font-weight: 800;
            color: var(--sd-text-strong);
            letter-spacing: -0.5px;
            line-height: 1.25;
            margin-bottom: 12px;
        }
        .sd-cat-banner-text .sd-lead {
            font-size: 15px;
            color: var(--sd-text-muted);
            line-height: 1.9;
            max-width: 560px;
            margin-bottom: 0;
        }
        .sd-banner-meta {
            display: flex;
            gap: 16px;
            align-items: center;
            margin-top: 16px;
            font-size: 13px;
            color: var(--sd-text-muted);
            flex-wrap: wrap;
        }
        .sd-banner-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .sd-banner-meta i {
            color: var(--sd-primary);
            font-size: 13px;
        }
        .sd-cat-banner-fig {
            background: var(--sd-surface);
            border-radius: var(--sd-radius-lg);
            overflow: hidden;
            box-shadow: var(--sd-shadow-card);
            border: 1px solid var(--sd-border);
        }
        .sd-cat-banner-fig img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .sd-fig-caption {
            padding: 10px 14px;
            font-size: 12px;
            color: var(--sd-text-muted);
            background: var(--sd-surface);
            border-top: 1px solid var(--sd-divider);
            text-align: center;
        }
        /* Dashboard Stats */
        .sd-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .sd-stat-card {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            padding: 22px 20px;
            box-shadow: var(--sd-shadow-card);
            transition: all var(--sd-transition);
            position: relative;
            overflow: hidden;
        }
        .sd-stat-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--sd-primary);
            opacity: .85;
        }
        .sd-stat-card:hover {
            box-shadow: var(--sd-shadow-card-hover);
            transform: translateY(-3px);
        }
        .sd-stat-label {
            font-size: 13px;
            color: var(--sd-text-muted);
            margin-bottom: 6px;
            font-weight: 500;
        }
        .sd-stat-value {
            font-family: var(--sd-font-mono);
            font-size: 36px;
            font-weight: 700;
            color: var(--sd-text-strong);
            line-height: 1.2;
            letter-spacing: -0.5px;
            margin-bottom: 4px;
        }
        .sd-stat-value .sd-stat-unit {
            font-size: 15px;
            font-weight: 500;
            color: var(--sd-text-muted);
            letter-spacing: 0;
            margin-left: 2px;
        }
        .sd-stat-trend {
            font-size: 12px;
            color: #2EAD6A;
            display: flex;
            align-items: center;
            gap: 4px;
            font-weight: 500;
        }
        .sd-stat-trend.down {
            color: #D9534F;
        }
        /* Chart Cards */
        .sd-chart-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .sd-chart-card {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            padding: 24px;
            box-shadow: var(--sd-shadow-card);
            transition: all var(--sd-transition);
        }
        .sd-chart-card:hover {
            box-shadow: var(--sd-shadow-card-hover);
        }
        .sd-chart-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 20px;
            flex-wrap: wrap;
            gap: 10px;
        }
        .sd-chart-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin: 0;
        }
        .sd-chart-badge {
            font-size: 12px;
            background: var(--sd-primary-light);
            color: var(--sd-primary);
            padding: 4px 12px;
            border-radius: 20px;
            font-weight: 600;
        }
        .sd-bar-chart {
            display: flex;
            align-items: flex-end;
            gap: 14px;
            height: 180px;
            padding-top: 10px;
        }
        .sd-bar-item {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: flex-end;
            gap: 6px;
            height: 100%;
        }
        .sd-bar {
            width: 100%;
            max-width: 52px;
            border-radius: 8px 8px 4px 4px;
            background: linear-gradient(180deg, #3A7BDE 0%, var(--sd-primary) 100%);
            transition: all var(--sd-transition);
            position: relative;
            min-height: 12px;
        }
        .sd-bar-item:hover .sd-bar {
            background: linear-gradient(180deg, #5A92E8 0%, var(--sd-primary) 100%);
            box-shadow: 0 6px 14px rgba(22, 87, 179, .2);
        }
        .sd-bar-label {
            font-size: 12px;
            color: var(--sd-text-muted);
            text-align: center;
            white-space: nowrap;
        }
        .sd-bar-value {
            font-family: var(--sd-font-mono);
            font-size: 12px;
            color: var(--sd-text-strong);
            font-weight: 600;
        }
        .sd-line-chart {
            position: relative;
            height: 180px;
            margin-top: 10px;
        }
        .sd-line-svg {
            width: 100%;
            height: 100%;
            display: block;
        }
        .sd-line-grid {
            position: absolute;
            inset: 0;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            pointer-events: none;
        }
        .sd-line-grid-line {
            border-top: 1px dashed var(--sd-divider);
            width: 100%;
        }
        .sd-line-labels {
            display: flex;
            justify-content: space-between;
            margin-top: 8px;
            font-size: 12px;
            color: var(--sd-text-muted);
        }
        /* Data list */
        .sd-data-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .sd-data-item {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            padding: 20px 24px;
            display: grid;
            grid-template-columns: auto 1fr auto;
            gap: 20px;
            align-items: center;
            box-shadow: var(--sd-shadow-card);
            transition: all var(--sd-transition);
        }
        .sd-data-item:hover {
            box-shadow: var(--sd-shadow-card-hover);
            transform: translateY(-2px);
            border-color: #CDD9EA;
        }
        .sd-data-rank {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: var(--sd-primary-light);
            color: var(--sd-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 18px;
            font-family: var(--sd-font-mono);
        }
        .sd-data-rank.first {
            background: #FFF5E6;
            color: var(--sd-accent);
        }
        .sd-data-content .sd-data-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin-bottom: 4px;
            line-height: 1.4;
        }
        .sd-data-content .sd-data-desc {
            font-size: 14px;
            color: var(--sd-text-muted);
            line-height: 1.7;
            margin-bottom: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .sd-data-meta {
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 4px;
            white-space: nowrap;
        }
        .sd-data-date {
            font-family: var(--sd-font-mono);
            font-size: 13px;
            color: var(--sd-text-muted);
        }
        .sd-data-tag {
            font-size: 12px;
            background: var(--sd-bg);
            color: var(--sd-text-muted);
            padding: 3px 10px;
            border-radius: 20px;
            font-weight: 500;
        }
        /* Category Entries */
        .sd-cat-entries {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .sd-cat-entry {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            padding: 20px 16px;
            text-align: center;
            box-shadow: var(--sd-shadow-card);
            transition: all var(--sd-transition);
        }
        .sd-cat-entry:hover {
            box-shadow: var(--sd-shadow-card-hover);
            transform: translateY(-3px);
            border-color: #CDD9EA;
        }
        .sd-cat-entry-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--sd-primary-light);
            color: var(--sd-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin: 0 auto 10px;
            transition: all var(--sd-transition);
        }
        .sd-cat-entry:hover .sd-cat-entry-icon {
            background: var(--sd-primary);
            color: #fff;
        }
        .sd-cat-entry-name {
            font-size: 15px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin-bottom: 4px;
        }
        .sd-cat-entry-desc {
            font-size: 12px;
            color: var(--sd-text-muted);
            margin-bottom: 0;
        }
        .sd-cat-entry a {
            position: relative;
            z-index: 1;
        }
        /* Topic cards */
        .sd-topic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .sd-topic-card {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            overflow: hidden;
            box-shadow: var(--sd-shadow-card);
            transition: all var(--sd-transition);
        }
        .sd-topic-card:hover {
            box-shadow: var(--sd-shadow-card-hover);
            transform: translateY(-3px);
        }
        .sd-topic-fig {
            height: 170px;
            overflow: hidden;
            position: relative;
        }
        .sd-topic-fig img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .3s ease;
        }
        .sd-topic-card:hover .sd-topic-fig img {
            transform: scale(1.04);
        }
        .sd-topic-body {
            padding: 18px 20px;
        }
        .sd-topic-name {
            font-size: 17px;
            font-weight: 700;
            color: var(--sd-text-strong);
            margin-bottom: 6px;
        }
        .sd-topic-desc {
            font-size: 13px;
            color: var(--sd-text-muted);
            margin-bottom: 12px;
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .sd-topic-link {
            font-size: 13px;
            font-weight: 600;
            color: var(--sd-primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .sd-topic-link:hover {
            color: var(--sd-primary-dark);
            gap: 8px;
        }
        /* Tags */
        .sd-tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .sd-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--sd-surface);
            color: var(--sd-text);
            border: 1px solid var(--sd-border);
            padding: 7px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            transition: all var(--sd-transition);
        }
        .sd-tag:hover {
            background: var(--sd-primary);
            color: #fff;
            border-color: var(--sd-primary);
        }
        .sd-tag i {
            font-size: 11px;
            color: var(--sd-accent);
        }
        .sd-tag:hover i {
            color: #fff;
        }
        /* FAQ */
        .sd-faq-wrap {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
        }
        .sd-faq-item {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-md);
            overflow: hidden;
            box-shadow: var(--sd-shadow-card);
            transition: all var(--sd-transition);
        }
        .sd-faq-item.active {
            border-color: #CDD9EA;
            box-shadow: var(--sd-shadow-card-hover);
        }
        .sd-faq-question {
            width: 100%;
            background: none;
            border: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 14px;
            padding: 18px 20px;
            font-size: 15px;
            font-weight: 700;
            color: var(--sd-text-strong);
            cursor: pointer;
            text-align: left;
            line-height: 1.5;
            transition: all var(--sd-transition);
        }
        .sd-faq-question:hover {
            color: var(--sd-primary);
        }
        .sd-faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--sd-primary-light);
            color: var(--sd-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            transition: transform .22s ease;
        }
        .sd-faq-item.active .sd-faq-icon {
            transform: rotate(180deg);
            background: var(--sd-primary);
            color: #fff;
        }
        .sd-faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .28s ease;
        }
        .sd-faq-answer-inner {
            padding: 0 20px 18px;
            font-size: 14px;
            color: var(--sd-text-muted);
            line-height: 1.85;
        }
        /* Expert recommendation */
        .sd-expert-bar {
            background: linear-gradient(135deg, #F0F5FD 0%, #F6F8FB 55%, #FFFDF7 100%);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-lg);
            padding: 30px 28px;
            display: grid;
            grid-template-columns: auto 1fr auto;
            gap: 24px;
            align-items: center;
            box-shadow: var(--sd-shadow-card);
        }
        .sd-expert-avatar {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--sd-primary) 0%, #3A7BDE 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 34px;
            box-shadow: 0 8px 20px rgba(22, 87, 179, .22);
            flex-shrink: 0;
        }
        .sd-expert-info .sd-expert-label {
            font-size: 12px;
            color: var(--sd-accent-dark);
            font-weight: 700;
            letter-spacing: .3px;
            margin-bottom: 4px;
            text-transform: uppercase;
        }
        .sd-expert-info .sd-expert-title {
            font-size: 20px;
            font-weight: 800;
            color: var(--sd-text-strong);
            margin-bottom: 8px;
            line-height: 1.3;
        }
        .sd-expert-info .sd-expert-desc {
            font-size: 14px;
            color: var(--sd-text-muted);
            margin-bottom: 0;
            line-height: 1.7;
            max-width: 560px;
        }
        .sd-expert-cta {
            display: flex;
            align-items: center;
        }
        /* Subscribe Bar */
        .sd-subscribe-card {
            background: var(--sd-surface);
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-lg);
            padding: 32px 28px;
            box-shadow: var(--sd-shadow-card);
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 24px;
            align-items: center;
        }
        .sd-subscribe-text .sd-subscribe-title {
            font-size: 22px;
            font-weight: 800;
            color: var(--sd-text-strong);
            margin-bottom: 6px;
        }
        .sd-subscribe-text .sd-subscribe-desc {
            font-size: 14px;
            color: var(--sd-text-muted);
            margin-bottom: 0;
        }
        .sd-subscribe-form {
            display: flex;
            gap: 10px;
            align-items: stretch;
        }
        .sd-subscribe-form input[type="email"] {
            min-width: 260px;
            padding: 10px 16px;
            border: 1px solid var(--sd-border);
            border-radius: var(--sd-radius-sm);
            font-size: 14px;
            color: var(--sd-text-strong);
            background: #fff;
            transition: border-color var(--sd-transition), box-shadow var(--sd-transition);
        }
        .sd-subscribe-form input[type="email"]:focus {
            border-color: var(--sd-primary);
            box-shadow: 0 0 0 3px rgba(22, 87, 179, .12);
            outline: none;
        }
        .sd-subscribe-form input[type="email"]::placeholder {
            color: var(--sd-text-disabled);
        }
        /* View more center */
        .sd-more-center {
            text-align: center;
        }
        /* Footer */
        .sd-footer {
            background: #16233B;
            color: #B3BDD0;
            padding: 56px 0 0;
            margin-top: 0;
        }
        .sd-footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 36px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255, 255, 255, .08);
        }
        .sd-footer-brand {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            font-weight: 800;
            font-size: 19px;
            color: #fff;
            margin-bottom: 12px;
        }
        .sd-footer-brand:hover {
            color: #fff;
            opacity: .85;
        }
        .sd-footer-brand .sd-logo-icon {
            width: 30px;
            height: 30px;
            font-size: 15px;
            border-radius: 8px;
        }
        .sd-footer-desc {
            font-size: 13px;
            color: #9EACBF;
            line-height: 1.8;
            margin-bottom: 16px;
            max-width: 320px;
        }
        .sd-footer-social {
            display: flex;
            gap: 10px;
        }
        .sd-footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            background: rgba(255, 255, 255, .06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #B3BDD0;
            font-size: 16px;
            transition: all var(--sd-transition);
        }
        .sd-footer-social a:hover {
            background: var(--sd-primary);
            color: #fff;
        }
        .sd-footer-heading {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }
        .sd-footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .sd-footer-links a {
            color: #9EACBF;
            font-size: 13px;
            transition: color var(--sd-transition);
        }
        .sd-footer-links a:hover {
            color: #fff;
        }
        .sd-footer-contact {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
            font-size: 13px;
            color: #9EACBF;
        }
        .sd-footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sd-footer-contact i {
            color: var(--sd-primary);
            width: 16px;
            text-align: center;
        }
        .sd-footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            padding: 20px 0;
            font-size: 13px;
            color: #7B8A9E;
        }
        .sd-footer-bottom a {
            color: #9EACBF;
            font-size: 13px;
            transition: color var(--sd-transition);
        }
        .sd-footer-bottom a:hover {
            color: #fff;
        }
        /* Responsive */
        @media (max-width: 992px) {
            .sd-header {
                height: var(--sd-nav-height-mobile);
            }
            .sd-nav-left,
            .sd-nav-right {
                display: none;
            }
            .sd-hamburger {
                display: block;
            }
            .sd-mobile-menu {
                display: block;
            }
            .sd-mobile-overlay {
                display: block;
            }
            .sd-header-inner {
                justify-content: space-between;
            }
            .sd-logo-wrap {
                position: absolute;
                left: 50%;
                transform: translateX(-50%);
                padding: 0;
            }
            .sd-hamburger {
                z-index: 2;
            }
            .sd-header-inner .sd-hamburger {
                order: -1;
            }
        }
        @media (max-width: 768px) {
            :root {
                --sd-section-gap: var(--sd-section-gap-mobile);
            }
            body {
                font-size: 14px;
            }
            .sd-h2 {
                font-size: 24px;
            }
            .sd-cat-banner-inner {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .sd-cat-banner-text .sd-h1 {
                font-size: 30px;
            }
            .sd-cat-banner-fig img {
                height: 140px;
            }
            .sd-stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .sd-stat-value {
                font-size: 28px;
            }
            .sd-chart-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .sd-data-item {
                grid-template-columns: auto 1fr;
                gap: 14px;
                padding: 16px 18px;
            }
            .sd-data-meta {
                grid-column: 1 / -1;
                flex-direction: row;
                align-items: center;
                gap: 12px;
                justify-content: flex-start;
                padding-top: 8px;
                border-top: 1px solid var(--sd-divider);
            }
            .sd-cat-entries {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .sd-topic-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .sd-expert-bar {
                grid-template-columns: 1fr;
                text-align: left;
                gap: 16px;
                padding: 24px 20px;
            }
            .sd-expert-avatar {
                margin: 0;
            }
            .sd-expert-cta {
                justify-content: flex-start;
            }
            .sd-subscribe-card {
                grid-template-columns: 1fr;
                gap: 18px;
                padding: 26px 20px;
            }
            .sd-subscribe-form {
                flex-direction: column;
            }
            .sd-subscribe-form input[type="email"] {
                min-width: 100%;
                width: 100%;
            }
            .sd-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px 20px;
            }
        }
        @media (max-width: 576px) {
            .sd-header-inner {
                padding: 0 4px;
            }
            .sd-cat-banner {
                padding: 28px 0 24px;
            }
            .sd-cat-banner-text .sd-h1 {
                font-size: 26px;
            }
            .sd-stats-grid {
                grid-template-columns: 1fr;
            }
            .sd-stat-card {
                padding: 18px 16px;
            }
            .sd-stat-value {
                font-size: 32px;
            }
            .sd-chart-card {
                padding: 18px 16px;
            }
            .sd-bar-chart {
                gap: 8px;
                height: 140px;
            }
            .sd-bar-label {
                font-size: 10px;
            }
            .sd-cat-entries {
                grid-template-columns: 1fr;
            }
            .sd-footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .sd-footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .sd-data-item {
                grid-template-columns: 1fr;
            }
            .sd-data-rank {
                width: 36px;
                height: 36px;
                font-size: 15px;
            }
        }

/* roulang page: category3 */
:root {
  --sd-primary: #1752B0;
  --sd-primary-dark: #0F3E88;
  --sd-accent: #F59E1B;
  --sd-accent-dark: #D9820A;
  --sd-bg: #F6F8FB;
  --sd-surface: #FFFFFF;
  --sd-text-strong: #16233B;
  --sd-text: #3A4658;
  --sd-text-muted: #6B7790;
  --sd-text-disabled: #A0A8B8;
  --sd-border: #E5EAF2;
  --sd-divider: #EEF2F7;
  --sd-radius-sm: 8px;
  --sd-radius-md: 12px;
  --sd-radius-lg: 16px;
  --sd-shadow-card: 0 8px 28px rgba(22, 87, 179, .08);
  --sd-shadow-card-hover: 0 12px 32px rgba(22, 87, 179, .16);
  --sd-font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --sd-font-mono: "Roboto Mono", "SFMono-Regular", monospace;
  --sd-nav-height: 72px;
  --sd-nav-height-mobile: 60px;
  --sd-section-gap: 72px;
  --sd-section-gap-mobile: 48px;
  --sd-break-xl: 1200px;
  --sd-break-lg: 992px;
  --sd-break-md: 768px;
  --sd-break-sm: 576px;
  --sd-transition: .18s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sd-font-sans);
  background-color: var(--sd-bg);
  color: var(--sd-text);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: var(--sd-primary);
  transition: color var(--sd-transition);
}

a:hover { color: var(--sd-primary-dark); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--sd-primary);
  outline-offset: 2px;
}

img { max-width: 100%; display: block; }

.text-muted-2 { color: var(--sd-text-muted); }

.sd-container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Header / Navigation */
.sd-header {
  position: sticky;
  top: 0;
  z-index: 1050;
  background: rgba(255, 255, 255, .98);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--sd-border), 0 6px 18px rgba(22, 87, 179, .04);
  height: var(--sd-nav-height);
  display: flex;
  align-items: center;
}

.sd-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.sd-nav-left,
.sd-nav-right {
  display: flex;
  align-items: center;
  gap: 26px;
  flex: 1;
}

.sd-nav-left { justify-content: flex-start; }
.sd-nav-right { justify-content: flex-end; }

.sd-logo-wrap {
  flex-shrink: 0;
  padding: 0 18px;
}

.sd-logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 800;
  font-size: 21px;
  color: var(--sd-text-strong);
  letter-spacing: -0.3px;
  white-space: nowrap;
}

.sd-logo:hover { color: var(--sd-primary); }

.sd-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--sd-primary), #3A7BDE);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  box-shadow: 0 6px 16px rgba(22, 87, 179, .24);
}

.sd-nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--sd-text);
  padding: 6px 2px;
  position: relative;
  transition: color var(--sd-transition);
}

.sd-nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--sd-primary);
  border-radius: 2px;
  transition: width .18s ease, left .18s ease;
}

.sd-nav-link:hover { color: var(--sd-primary); }

.sd-nav-link:hover::after,
.sd-nav-link.active::after {
  width: 100%;
  left: 0;
}

.sd-nav-link.active {
  color: var(--sd-primary);
  font-weight: 700;
}

.sd-hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--sd-text-strong);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
}

.sd-hamburger:hover { background: var(--sd-bg); }

/* Mobile menu drawer */
.sd-mobile-menu {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  width: 300px;
  max-width: 82vw;
  height: 100vh;
  background: #fff;
  box-shadow: 8px 0 30px rgba(22, 87, 179, .12);
  z-index: 1100;
  padding: 24px 20px;
  transform: translateX(-100%);
  transition: transform .22s ease;
  overflow-y: auto;
}

.sd-mobile-menu.open { transform: translateX(0); }

.sd-mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--sd-divider);
}

.sd-mobile-close {
  background: none;
  border: none;
  font-size: 22px;
  color: var(--sd-text-muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
}

.sd-mobile-close:hover { background: var(--sd-bg); }

.sd-mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sd-mobile-nav a {
  display: block;
  padding: 14px 12px;
  font-size: 16px;
  font-weight: 500;
  color: var(--sd-text);
  border-radius: var(--sd-radius-sm);
  transition: background var(--sd-transition), color var(--sd-transition);
}

.sd-mobile-nav a:hover,
.sd-mobile-nav a.active {
  background: rgba(22, 87, 179, .06);
  color: var(--sd-primary);
}

.sd-mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 21, 35, .4);
  z-index: 1090;
  opacity: 0;
  transition: opacity .22s ease;
}

.sd-mobile-overlay.show {
  opacity: 1;
  display: block;
}

/* Section common */
.sd-section {
  padding: var(--sd-section-gap) 0;
}

.sd-section-alt {
  background: #F0F4FA;
}

.sd-section-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--sd-text-strong);
  margin-bottom: 10px;
  letter-spacing: -0.3px;
  line-height: 1.3;
}

.sd-section-subtitle {
  font-size: 15px;
  color: var(--sd-text-muted);
  margin-bottom: 32px;
  max-width: 680px;
  line-height: 1.8;
}

/* Buttons */
.sd-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  border-radius: var(--sd-radius-sm);
  padding: 10px 22px;
  border: none;
  cursor: pointer;
  transition: background var(--sd-transition), color var(--sd-transition), box-shadow var(--sd-transition), border-color var(--sd-transition);
  text-decoration: none;
  letter-spacing: .2px;
}

.sd-btn-primary {
  background: var(--sd-primary);
  color: #fff;
}

.sd-btn-primary:hover {
  background: var(--sd-primary-dark);
  color: #fff;
}

.sd-btn-outline {
  background: transparent;
  border: 1.5px solid var(--sd-primary);
  color: var(--sd-primary);
}

.sd-btn-outline:hover {
  background: rgba(22, 87, 179, .06);
  color: var(--sd-primary);
}

.sd-btn-accent {
  background: var(--sd-accent);
  color: #fff;
}

.sd-btn-accent:hover {
  background: var(--sd-accent-dark);
  color: #fff;
}

.sd-btn-sm {
  padding: 7px 16px;
  font-size: 13px;
  border-radius: 6px;
}

.sd-btn-lg {
  padding: 13px 30px;
  font-size: 16px;
  border-radius: var(--sd-radius-sm);
}

/* Cards */
.sd-card {
  background: var(--sd-surface);
  border: 1px solid var(--sd-border);
  border-radius: var(--sd-radius-md);
  box-shadow: var(--sd-shadow-card);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  overflow: hidden;
}

.sd-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--sd-shadow-card-hover);
  border-color: rgba(22, 87, 179, .18);
}

.sd-card-body {
  padding: 20px;
}

.sd-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--sd-text-strong);
  line-height: 1.4;
  margin-bottom: 8px;
}

.sd-card-text {
  font-size: 14px;
  color: var(--sd-text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

/* Badge / Tag */
.sd-badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
  background: rgba(22, 87, 179, .08);
  color: var(--sd-primary);
  letter-spacing: .3px;
}

.sd-badge-accent {
  background: rgba(245, 158, 27, .12);
  color: var(--sd-accent-dark);
}

.sd-tag {
  display: inline-block;
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 20px;
  background: #EDF1F8;
  color: var(--sd-text);
  transition: background var(--sd-transition), color var(--sd-transition);
  text-decoration: none;
}

.sd-tag:hover {
  background: var(--sd-primary);
  color: #fff;
}

/* Breadcrumb */
.sd-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--sd-text-muted);
  margin-bottom: 16px;
}

.sd-breadcrumb a {
  color: var(--sd-text-muted);
}

.sd-breadcrumb a:hover {
  color: var(--sd-primary);
}

.sd-breadcrumb .sep {
  color: var(--sd-text-disabled);
  font-size: 11px;
}

/* Page banner */
.sd-page-banner {
  padding: 48px 0 36px;
  background: linear-gradient(135deg, #F4F8FE 0%, #EDF3FC 100%);
  border-bottom: 1px solid var(--sd-border);
}

.sd-page-banner-grid {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 32px;
  align-items: center;
}

.sd-page-banner-img {
  border-radius: var(--sd-radius-md);
  overflow: hidden;
  box-shadow: var(--sd-shadow-card);
  height: 170px;
  object-fit: cover;
  width: 100%;
}

/* Filter sidebar */
.sd-filter-panel {
  background: var(--sd-surface);
  border: 1px solid var(--sd-border);
  border-radius: var(--sd-radius-md);
  padding: 20px;
  box-shadow: 0 4px 16px rgba(22, 87, 179, .04);
  position: sticky;
  top: calc(var(--sd-nav-height) + 20px);
}

.sd-filter-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--sd-text-strong);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--sd-divider);
}

.sd-filter-group {
  margin-bottom: 18px;
}

.sd-filter-group-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--sd-text);
  margin-bottom: 8px;
}

.sd-filter-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--sd-text);
  padding: 6px 0;
  cursor: pointer;
  transition: color var(--sd-transition);
}

.sd-filter-check:hover {
  color: var(--sd-primary);
}

.sd-filter-check input[type="checkbox"],
.sd-filter-check input[type="radio"] {
  accent-color: var(--sd-primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
  flex-shrink: 0;
}

.sd-filter-divider {
  border: none;
  border-top: 1px solid var(--sd-divider);
  margin: 14px 0;
}

.sd-filter-clear {
  font-size: 13px;
  color: var(--sd-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 0;
}

.sd-filter-clear:hover { color: var(--sd-primary); }

/* Review list */
.sd-review-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sd-review-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  background: var(--sd-surface);
  border: 1px solid var(--sd-border);
  border-radius: var(--sd-radius-md);
  overflow: hidden;
  box-shadow: var(--sd-shadow-card);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.sd-review-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--sd-shadow-card-hover);
  border-color: rgba(22, 87, 179, .18);
}

.sd-review-img {
  height: 100%;
  min-height: 170px;
  object-fit: cover;
  width: 100%;
}

.sd-review-body {
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}

.sd-review-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--sd-text-muted);
}

.sd-review-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--sd-text-strong);
  line-height: 1.45;
  margin-bottom: 2px;
}

.sd-review-excerpt {
  font-size: 14px;
  color: var(--sd-text-muted);
  line-height: 1.8;
  margin-bottom: 4px;
}

/* Data strip */
.sd-data-strip {
  background: linear-gradient(135deg, var(--sd-primary-dark), var(--sd-primary));
  border-radius: var(--sd-radius-lg);
  padding: 32px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}

.sd-data-num {
  font-family: var(--sd-font-mono);
  font-size: 32px;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}

.sd-data-label {
  font-size: 13px;
  color: rgba(255, 255, 255, .75);
  margin-top: 4px;
}

/* Category entry cards */
.sd-cat-entry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.sd-cat-entry {
  display: block;
  background: var(--sd-surface);
  border: 1px solid var(--sd-border);
  border-radius: var(--sd-radius-sm);
  padding: 18px 14px;
  text-align: center;
  color: var(--sd-text);
  transition: border-color var(--sd-transition), box-shadow var(--sd-transition), transform var(--sd-transition);
  text-decoration: none;
}

.sd-cat-entry:hover {
  border-color: var(--sd-primary);
  box-shadow: var(--sd-shadow-card);
  transform: translateY(-3px);
  color: var(--sd-text);
}

.sd-cat-entry-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 10px;
  background: rgba(22, 87, 179, .08);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sd-primary);
  font-size: 18px;
}

.sd-cat-entry-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--sd-text-strong);
}

/* Topic cards */
.sd-topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.sd-topic-card {
  background: var(--sd-surface);
  border-radius: var(--sd-radius-lg);
  overflow: hidden;
  border: 1px solid var(--sd-border);
  box-shadow: var(--sd-shadow-card);
  transition: transform .18s ease, box-shadow .18s ease;
}

.sd-topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--sd-shadow-card-hover);
}

.sd-topic-img {
  height: 200px;
  object-fit: cover;
  width: 100%;
}

.sd-topic-body {
  padding: 18px 20px;
}

.sd-topic-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--sd-text-strong);
  margin-bottom: 6px;
}

.sd-topic-text {
  font-size: 13px;
  color: var(--sd-text-muted);
  line-height: 1.75;
  margin-bottom: 12px;
}

/* Subscribe bar */
.sd-subscribe-bar {
  background: var(--sd-surface);
  border: 1px solid var(--sd-border);
  border-radius: var(--sd-radius-md);
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  box-shadow: var(--sd-shadow-card);
}

.sd-subscribe-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--sd-text-strong);
  margin-bottom: 4px;
}

.sd-subscribe-text {
  font-size: 13px;
  color: var(--sd-text-muted);
}

.sd-subscribe-form {
  display: flex;
  gap: 10px;
  flex: 1;
  max-width: 460px;
  min-width: 280px;
}

.sd-input {
  flex: 1;
  padding: 11px 16px;
  border: 1px solid var(--sd-border);
  border-radius: var(--sd-radius-sm);
  font-size: 14px;
  color: var(--sd-text);
  background: #FAFCFE;
  transition: border-color var(--sd-transition), box-shadow var(--sd-transition);
}

.sd-input:focus {
  outline: none;
  border-color: var(--sd-primary);
  box-shadow: 0 0 0 3px rgba(22, 87, 179, .12);
}

/* FAQ */
.sd-faq {
  background: var(--sd-surface);
  border-radius: var(--sd-radius-md);
  overflow: hidden;
  box-shadow: var(--sd-shadow-card);
}

.sd-faq-item {
  border-bottom: 1px solid var(--sd-divider);
  border-left: 3px solid var(--sd-primary);
}

.sd-faq-item:last-child {
  border-bottom: none;
}

.sd-faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  color: var(--sd-text-strong);
  transition: background var(--sd-transition);
  user-select: none;
}

.sd-faq-question:hover {
  background: #F8FAFD;
}

.sd-faq-arrow {
  color: var(--sd-primary);
  font-size: 14px;
  transition: transform .22s ease;
  flex-shrink: 0;
  margin-left: 12px;
}

.sd-faq-item.open .sd-faq-arrow {
  transform: rotate(180deg);
}

.sd-faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .28s ease;
  background: #F9FBFE;
}

.sd-faq-item.open .sd-faq-answer {
  max-height: 300px;
}

.sd-faq-answer-inner {
  padding: 16px 20px 20px;
  font-size: 14px;
  color: var(--sd-text);
  line-height: 1.85;
}

/* Expert recommend */
.sd-expert-bar {
  background: var(--sd-surface);
  border: 1px solid var(--sd-border);
  border-radius: var(--sd-radius-md);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  box-shadow: var(--sd-shadow-card);
}

.sd-expert-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--sd-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  flex-shrink: 0;
}

.sd-expert-info {
  flex: 1;
  min-width: 200px;
}

.sd-expert-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--sd-text-strong);
}

.sd-expert-desc {
  font-size: 13px;
  color: var(--sd-text-muted);
  line-height: 1.7;
  margin-top: 2px;
}

/* Center more button */
.sd-center-more {
  text-align: center;
  padding: 12px 0;
}

/* Footer */
.sd-footer {
  background: #0F1523;
  color: rgba(255, 255, 255, .75);
  padding: 56px 0 24px;
  margin-top: 0;
}

.sd-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 36px;
  margin-bottom: 40px;
}

.sd-footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 800;
  font-size: 19px;
  color: #fff;
  margin-bottom: 14px;
}

.sd-footer-brand:hover { color: #fff; }

.sd-footer-brand .sd-logo-icon {
  width: 30px;
  height: 30px;
  font-size: 15px;
  border-radius: 8px;
  background: var(--sd-primary);
}

.sd-footer-desc {
  font-size: 13px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .6);
  margin-bottom: 16px;
  max-width: 320px;
}

.sd-footer-social {
  display: flex;
  gap: 10px;
}

.sd-footer-social a {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: rgba(255, 255, 255, .06);
  color: rgba(255, 255, 255, .7);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--sd-transition), color var(--sd-transition);
}

.sd-footer-social a:hover {
  background: var(--sd-primary);
  color: #fff;
}

.sd-footer-heading {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.sd-footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sd-footer-links a {
  color: rgba(255, 255, 255, .6);
  font-size: 13px;
  transition: color var(--sd-transition);
}

.sd-footer-links a:hover {
  color: #fff;
}

.sd-footer-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sd-footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: rgba(255, 255, 255, .6);
}

.sd-footer-contact i {
  color: var(--sd-primary);
  margin-top: 4px;
  width: 14px;
  text-align: center;
}

.sd-footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  font-size: 12px;
  color: rgba(255, 255, 255, .45);
}

.sd-footer-bottom a {
  color: rgba(255, 255, 255, .55);
  transition: color var(--sd-transition);
}

.sd-footer-bottom a:hover {
  color: #fff;
}

/* Responsive */
@media (max-width: 991px) {
  .sd-nav-left,
  .sd-nav-right {
    display: none;
  }

  .sd-hamburger {
    display: block;
  }

  .sd-header {
    height: var(--sd-nav-height-mobile);
  }

  .sd-logo-wrap {
    padding: 0;
    margin: 0 auto;
  }

  .sd-header-inner {
    justify-content: flex-start;
  }

  .sd-page-banner-grid {
    grid-template-columns: 1fr;
  }

  .sd-page-banner-img {
    height: 180px;
  }

  .sd-review-card {
    grid-template-columns: 1fr;
  }

  .sd-review-img {
    height: 200px;
    min-height: auto;
  }

  .sd-data-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .sd-cat-entry-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sd-topic-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sd-filter-panel {
    position: static;
    margin-bottom: 20px;
  }

  .sd-footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  .sd-section {
    padding: var(--sd-section-gap-mobile) 0;
  }

  .sd-section-title {
    font-size: 24px;
  }

  .sd-review-title {
    font-size: 16px;
  }

  .sd-subscribe-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .sd-subscribe-form {
    width: 100%;
  }
}

@media (max-width: 575px) {
  .sd-data-strip {
    grid-template-columns: 1fr;
    text-align: left;
    gap: 12px;
  }

  .sd-cat-entry-grid {
    grid-template-columns: 1fr;
  }

  .sd-topic-grid {
    grid-template-columns: 1fr;
  }

  .sd-footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .sd-footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }

  .sd-review-img {
    height: 160px;
  }

  .sd-review-meta {
    gap: 8px;
  }

  .sd-page-banner {
    padding: 32px 0 24px;
  }
}

/* roulang page: category4 */
:root {
        --sd-primary: #1752B0;
        --sd-primary-dark: #0F3E88;
        --sd-accent: #F59E1B;
        --sd-accent-dark: #D9820A;
        --sd-bg: #F6F8FB;
        --sd-surface: #FFFFFF;
        --sd-text-strong: #16233B;
        --sd-text: #3A4658;
        --sd-text-muted: #6B7790;
        --sd-text-disabled: #A0A8B8;
        --sd-border: #E5EAF2;
        --sd-divider: #EEF2F7;
        --sd-radius-sm: 8px;
        --sd-radius-md: 12px;
        --sd-radius-lg: 16px;
        --sd-shadow-card: 0 8px 28px rgba(22, 87, 179, .08);
        --sd-shadow-card-hover: 0 12px 32px rgba(22, 87, 179, .16);
        --sd-font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
        --sd-font-mono: "Roboto Mono", "SFMono-Regular", monospace;
        --sd-nav-height: 72px;
        --sd-nav-height-mobile: 60px;
        --sd-section-gap: 72px;
        --sd-section-gap-mobile: 48px;
        --sd-break-xl: 1200px;
        --sd-break-lg: 992px;
        --sd-break-md: 768px;
        --sd-break-sm: 576px;
        --sd-transition: .18s ease;
    }
    html {
        scroll-behavior: smooth;
    }
    body {
        font-family: var(--sd-font-sans);
        background-color: var(--sd-bg);
        color: var(--sd-text);
        font-size: 15px;
        line-height: 1.8;
        margin: 0;
        padding: 0;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    a {
        text-decoration: none;
        color: var(--sd-primary);
        transition: color var(--sd-transition);
    }
    a:hover {
        color: var(--sd-primary-dark);
    }
    a:focus-visible,
    button:focus-visible {
        outline: 2px solid var(--sd-primary);
        outline-offset: 2px;
    }
    img {
        max-width: 100%;
        display: block;
    }
    .text-muted-2 {
        color: var(--sd-text-muted);
    }
    .sd-container {
        width: 100%;
        max-width: 1200px;
        margin-left: auto;
        margin-right: auto;
        padding-left: 20px;
        padding-right: 20px;
    }
    /* Header / Navigation */
    .sd-header {
        position: sticky;
        top: 0;
        z-index: 1050;
        background: rgba(255, 255, 255, .98);
        backdrop-filter: blur(10px);
        box-shadow: 0 1px 0 var(--sd-border), 0 6px 18px rgba(22, 87, 179, .04);
        height: var(--sd-nav-height);
        display: flex;
        align-items: center;
    }
    .sd-header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
    }
    .sd-nav-left,
    .sd-nav-right {
        display: flex;
        align-items: center;
        gap: 26px;
        flex: 1;
    }
    .sd-nav-left {
        justify-content: flex-start;
    }
    .sd-nav-right {
        justify-content: flex-end;
    }
    .sd-logo-wrap {
        flex-shrink: 0;
        padding: 0 18px;
    }
    .sd-logo {
        display: inline-flex;
        align-items: center;
        gap: 9px;
        font-weight: 800;
        font-size: 21px;
        color: var(--sd-text-strong);
        letter-spacing: -0.3px;
        white-space: nowrap;
    }
    .sd-logo:hover {
        color: var(--sd-primary);
    }
    .sd-logo-icon {
        width: 36px;
        height: 36px;
        background: linear-gradient(135deg, var(--sd-primary), #3A7BDE);
        border-radius: 10px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: #fff;
        font-size: 18px;
        box-shadow: 0 6px 16px rgba(22, 87, 179, .24);
    }
    .sd-nav-link {
        font-size: 15px;
        font-weight: 500;
        color: var(--sd-text);
        padding: 6px 2px;
        position: relative;
        transition: color var(--sd-transition);
    }
    .sd-nav-link::after {
        content: "";
        position: absolute;
        left: 50%;
        bottom: -2px;
        width: 0;
        height: 2px;
        background: var(--sd-primary);
        border-radius: 2px;
        transition: width .18s ease, left .18s ease;
    }
    .sd-nav-link:hover {
        color: var(--sd-primary);
    }
    .sd-nav-link:hover::after,
    .sd-nav-link.active::after {
        width: 100%;
        left: 0;
    }
    .sd-nav-link.active {
        color: var(--sd-primary);
        font-weight: 700;
    }
    .sd-hamburger {
        display: none;
        background: none;
        border: none;
        font-size: 24px;
        color: var(--sd-text-strong);
        cursor: pointer;
        padding: 4px 8px;
        border-radius: 6px;
    }
    .sd-hamburger:hover {
        background: var(--sd-bg);
    }
    /* Mobile Menu */
    .sd-mobile-menu {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 300px;
        max-width: 80vw;
        height: 100vh;
        background: #fff;
        box-shadow: 8px 0 30px rgba(22, 87, 179, .12);
        z-index: 1100;
        padding: 24px 20px;
        transform: translateX(-100%);
        transition: transform .22s ease;
        overflow-y: auto;
    }
    .sd-mobile-menu.open {
        transform: translateX(0);
    }
    .sd-mobile-menu-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 28px;
    }
    .sd-mobile-menu-close {
        background: none;
        border: none;
        font-size: 24px;
        color: var(--sd-text);
        cursor: pointer;
    }
    .sd-mobile-menu .sd-nav-link {
        display: block;
        padding: 12px 0;
        font-size: 17px;
        border-bottom: 1px solid var(--sd-divider);
    }
    .sd-mobile-menu .sd-nav-link::after {
        display: none;
    }
    .sd-mobile-menu .sd-nav-link.active {
        font-weight: 700;
    }
    .sd-mobile-menu-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(22, 35, 59, .45);
        z-index: 1090;
        opacity: 0;
        pointer-events: none;
        transition: opacity .22s ease;
    }
    .sd-mobile-menu-backdrop.show {
        opacity: 1;
        pointer-events: auto;
    }
    /* Category Banner */
    .sd-category-banner {
        padding: 40px 0 32px;
        background: #fff;
        border-bottom: 1px solid var(--sd-border);
    }
    .sd-breadcrumb {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        font-size: 13px;
        color: var(--sd-text-muted);
        margin-bottom: 16px;
        list-style: none;
        padding: 0;
    }
    .sd-breadcrumb li:not(:last-child)::after {
        content: "/";
        margin-left: 8px;
        color: var(--sd-text-disabled);
    }
    .sd-breadcrumb a {
        color: var(--sd-text-muted);
    }
    .sd-breadcrumb a:hover {
        color: var(--sd-primary);
    }
    .sd-category-banner-inner {
        display: flex;
        gap: 32px;
        align-items: center;
    }
    .sd-category-banner-text {
        flex: 1;
    }
    .sd-category-banner h1 {
        font-size: 32px;
        font-weight: 800;
        color: var(--sd-text-strong);
        margin: 0 0 12px;
        line-height: 1.25;
    }
    .sd-category-banner p {
        font-size: 15px;
        color: var(--sd-text-muted);
        margin: 0;
        line-height: 1.8;
    }
    .sd-category-banner-img {
        flex: 0 0 280px;
        border-radius: var(--sd-radius-lg);
        overflow: hidden;
        box-shadow: var(--sd-shadow-card);
    }
    .sd-category-banner-img img {
        width: 100%;
        height: 180px;
        object-fit: cover;
    }
    /* Filter Layout */
    .sd-filter-layout {
        display: grid;
        grid-template-columns: 260px 1fr;
        gap: 28px;
        align-items: start;
    }
    .sd-filter-sidebar {
        background: #fff;
        border: 1px solid var(--sd-border);
        border-radius: var(--sd-radius-md);
        padding: 20px 16px;
        box-shadow: var(--sd-shadow-card);
        position: sticky;
        top: calc(var(--sd-nav-height) + 20px);
    }
    .sd-filter-heading {
        font-size: 16px;
        font-weight: 700;
        color: var(--sd-text-strong);
        margin: 0 0 14px;
        padding-bottom: 10px;
        border-bottom: 1px solid var(--sd-divider);
    }
    .sd-filter-group {
        margin-bottom: 20px;
    }
    .sd-filter-group-title {
        font-size: 13px;
        font-weight: 600;
        color: var(--sd-text-muted);
        text-transform: uppercase;
        letter-spacing: 0.5px;
        margin-bottom: 10px;
    }
    .sd-filter-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    .sd-filter-tag {
        display: inline-block;
        background: var(--sd-bg);
        border: 1px solid var(--sd-border);
        border-radius: 20px;
        padding: 4px 12px;
        font-size: 13px;
        color: var(--sd-text);
        transition: all var(--sd-transition);
        cursor: default;
    }
    .sd-filter-tag:hover,
    .sd-filter-tag.active {
        background: var(--sd-primary);
        border-color: var(--sd-primary);
        color: #fff;
    }
    .sd-filter-radio {
        display: block;
        font-size: 14px;
        color: var(--sd-text);
        padding: 4px 0;
        cursor: default;
    }
    .sd-filter-radio input {
        margin-right: 6px;
        accent-color: var(--sd-primary);
    }
    /* Review Cards */
    .sd-review-list {
        display: flex;
        flex-direction: column;
        gap: 18px;
    }
    .sd-review-card {
        background: #fff;
        border: 1px solid var(--sd-border);
        border-radius: var(--sd-radius-md);
        overflow: hidden;
        box-shadow: var(--sd-shadow-card);
        transition: box-shadow var(--sd-transition), transform var(--sd-transition);
        display: flex;
        gap: 18px;
        padding: 16px;
    }
    .sd-review-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--sd-shadow-card-hover);
    }
    .sd-review-card-img {
        flex: 0 0 180px;
        height: 130px;
        border-radius: var(--sd-radius-sm);
        overflow: hidden;
    }
    .sd-review-card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }
    .sd-review-card-body {
        flex: 1;
        display: flex;
        flex-direction: column;
    }
    .sd-review-card-meta {
        display: flex;
        gap: 12px;
        font-size: 12px;
        color: var(--sd-text-muted);
        margin-bottom: 6px;
    }
    .sd-review-card-meta .sd-tag {
        background: #EFF3FA;
        color: var(--sd-primary);
        padding: 2px 8px;
        border-radius: 4px;
        font-weight: 600;
    }
    .sd-review-card h3 {
        font-size: 18px;
        font-weight: 700;
        color: var(--sd-text-strong);
        margin: 0 0 6px;
        line-height: 1.4;
    }
    .sd-review-card p {
        font-size: 14px;
        color: var(--sd-text-muted);
        margin: 0 0 10px;
        line-height: 1.7;
        flex: 1;
    }
    .sd-review-card-footer {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
    .sd-btn-outline-sm {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        font-size: 13px;
        font-weight: 600;
        color: var(--sd-primary);
        background: transparent;
        border: 1px solid var(--sd-primary);
        border-radius: var(--sd-radius-sm);
        padding: 6px 12px;
        transition: all var(--sd-transition);
    }
    .sd-btn-outline-sm:hover {
        background: #EFF3FA;
        color: var(--sd-primary-dark);
    }
    .sd-review-card-date {
        font-size: 12px;
        color: var(--sd-text-disabled);
        font-family: var(--sd-font-mono);
    }
    /* Section Common */
    .sd-section {
        padding: var(--sd-section-gap) 0;
    }
    .sd-section-alt {
        background: #fff;
    }
    .sd-section-heading {
        font-size: 26px;
        font-weight: 800;
        color: var(--sd-text-strong);
        margin: 0 0 8px;
        line-height: 1.3;
    }
    .sd-section-sub {
        font-size: 15px;
        color: var(--sd-text-muted);
        margin: 0 0 28px;
        line-height: 1.8;
    }
    /* Category Entry */
    .sd-entry-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 16px;
    }
    .sd-entry-card {
        background: #fff;
        border: 1px solid var(--sd-border);
        border-radius: var(--sd-radius-md);
        padding: 18px 14px;
        text-align: center;
        box-shadow: var(--sd-shadow-card);
        transition: all var(--sd-transition);
        display: block;
        color: var(--sd-text);
    }
    .sd-entry-card:hover {
        transform: translateY(-3px);
        box-shadow: var(--sd-shadow-card-hover);
        color: var(--sd-primary);
    }
    .sd-entry-card i {
        font-size: 24px;
        color: var(--sd-primary);
        margin-bottom: 8px;
    }
    .sd-entry-card span {
        display: block;
        font-size: 15px;
        font-weight: 600;
        color: var(--sd-text-strong);
    }
    .sd-entry-card:hover span {
        color: var(--sd-primary);
    }
    /* View More */
    .sd-view-more {
        text-align: center;
    }
    .sd-btn-primary-lg {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: var(--sd-primary);
        color: #fff;
        border: none;
        border-radius: var(--sd-radius-sm);
        padding: 12px 28px;
        font-size: 15px;
        font-weight: 600;
        transition: background var(--sd-transition);
    }
    .sd-btn-primary-lg:hover {
        background: var(--sd-primary-dark);
        color: #fff;
    }
    /* Data Stats */
    .sd-stats-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 18px;
    }
    .sd-stat-card {
        background: linear-gradient(135deg, var(--sd-primary-dark), var(--sd-primary));
        border-radius: var(--sd-radius-md);
        padding: 22px 18px;
        color: #fff;
        text-align: center;
    }
    .sd-stat-number {
        font-size: 32px;
        font-weight: 800;
        font-family: var(--sd-font-mono);
        line-height: 1.2;
    }
    .sd-stat-label {
        font-size: 14px;
        color: rgba(255, 255, 255, .85);
        margin-top: 4px;
    }
    /* Tag Wall */
    .sd-tag-wall {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }
    .sd-tag-link {
        display: inline-block;
        background: #fff;
        border: 1px solid var(--sd-border);
        border-radius: 20px;
        padding: 6px 16px;
        font-size: 14px;
        color: var(--sd-text);
        transition: all var(--sd-transition);
    }
    .sd-tag-link:hover {
        background: var(--sd-primary);
        border-color: var(--sd-primary);
        color: #fff;
    }
    /* Topic Cards */
    .sd-topic-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    .sd-topic-card {
        background: #fff;
        border-radius: var(--sd-radius-md);
        overflow: hidden;
        border: 1px solid var(--sd-border);
        box-shadow: var(--sd-shadow-card);
        transition: all var(--sd-transition);
    }
    .sd-topic-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--sd-shadow-card-hover);
    }
    .sd-topic-card img {
        width: 100%;
        height: 160px;
        object-fit: cover;
    }
    .sd-topic-card-body {
        padding: 16px 18px;
    }
    .sd-topic-card h3 {
        font-size: 18px;
        font-weight: 700;
        color: var(--sd-text-strong);
        margin: 0 0 6px;
    }
    .sd-topic-card p {
        font-size: 14px;
        color: var(--sd-text-muted);
        margin: 0 0 10px;
    }
    .sd-topic-card a {
        font-size: 14px;
        font-weight: 600;
        color: var(--sd-primary);
    }
    /* Recommendation Bar */
    .sd-reco-bar {
        background: #fff;
        border-left: 4px solid var(--sd-accent);
        border-radius: var(--sd-radius-md);
        padding: 18px 20px;
        box-shadow: var(--sd-shadow-card);
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 16px;
    }
    .sd-reco-bar-text h3 {
        font-size: 18px;
        font-weight: 700;
        color: var(--sd-text-strong);
        margin: 0 0 4px;
    }
    .sd-reco-bar-text p {
        font-size: 14px;
        color: var(--sd-text-muted);
        margin: 0;
    }
    .sd-reco-bar .sd-btn-outline-sm {
        white-space: nowrap;
    }
    /* Subscribe */
    .sd-subscribe-box {
        background: #fff;
        border: 1px solid var(--sd-border);
        border-radius: var(--sd-radius-lg);
        padding: 28px;
        box-shadow: var(--sd-shadow-card);
        display: flex;
        flex-wrap: wrap;
        gap: 20px;
        justify-content: space-between;
        align-items: center;
    }
    .sd-subscribe-text h3 {
        font-size: 20px;
        font-weight: 700;
        color: var(--sd-text-strong);
        margin: 0 0 6px;
    }
    .sd-subscribe-text p {
        font-size: 14px;
        color: var(--sd-text-muted);
        margin: 0;
    }
    .sd-subscribe-form {
        display: flex;
        gap: 10px;
        flex: 1;
        min-width: 260px;
        max-width: 420px;
    }
    .sd-subscribe-form input {
        flex: 1;
        border: 1px solid var(--sd-border);
        border-radius: var(--sd-radius-sm);
        padding: 10px 14px;
        font-size: 14px;
        color: var(--sd-text);
        transition: border-color var(--sd-transition), box-shadow var(--sd-transition);
    }
    .sd-subscribe-form input:focus {
        outline: none;
        border-color: var(--sd-primary);
        box-shadow: 0 0 0 3px rgba(22, 87, 179, .1);
    }
    .sd-btn-accent {
        background: var(--sd-accent);
        color: #fff;
        border: none;
        border-radius: var(--sd-radius-sm);
        padding: 10px 22px;
        font-size: 14px;
        font-weight: 600;
        transition: background var(--sd-transition);
        white-space: nowrap;
    }
    .sd-btn-accent:hover {
        background: var(--sd-accent-dark);
        color: #fff;
    }
    /* Footer */
    .sd-footer {
        background: #0F1523;
        color: #c7d0de;
        padding: 48px 0 24px;
        font-size: 14px;
    }
    .sd-footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1.5fr;
        gap: 32px;
        margin-bottom: 32px;
    }
    .sd-footer-brand {
        display: inline-flex;
        align-items: center;
        gap: 9px;
        font-size: 20px;
        font-weight: 800;
        color: #fff;
        margin-bottom: 12px;
    }
    .sd-footer-brand:hover {
        color: #fff;
    }
    .sd-footer-desc {
        font-size: 13px;
        line-height: 1.7;
        color: #9aa5b8;
        margin: 0 0 16px;
    }
    .sd-footer-social {
        display: flex;
        gap: 10px;
    }
    .sd-footer-social a {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        background: rgba(255, 255, 255, .06);
        border-radius: 50%;
        color: #c7d0de;
        font-size: 16px;
        transition: all var(--sd-transition);
    }
    .sd-footer-social a:hover {
        background: var(--sd-primary);
        color: #fff;
    }
    .sd-footer-heading {
        font-size: 15px;
        font-weight: 700;
        color: #fff;
        margin-bottom: 12px;
    }
    .sd-footer-links {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .sd-footer-links li {
        margin-bottom: 8px;
    }
    .sd-footer-links a {
        color: #9aa5b8;
        font-size: 13px;
        transition: color var(--sd-transition);
    }
    .sd-footer-links a:hover {
        color: #fff;
    }
    .sd-footer-contact {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .sd-footer-contact li {
        display: flex;
        align-items: center;
        gap: 8px;
        color: #9aa5b8;
        font-size: 13px;
        margin-bottom: 8px;
    }
    .sd-footer-contact i {
        color: var(--sd-primary);
        width: 16px;
    }
    .sd-footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, .08);
        padding-top: 18px;
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 8px;
        font-size: 13px;
        color: #7c889b;
    }
    .sd-footer-bottom a {
        color: #7c889b;
        margin-left: 4px;
    }
    .sd-footer-bottom a:hover {
        color: #fff;
    }
    /* Responsive */
    @media (max-width: 1199px) {
        .sd-nav-left, .sd-nav-right {
            gap: 18px;
        }
        .sd-logo-wrap {
            padding: 0 12px;
        }
    }
    @media (max-width: 991px) {
        .sd-header {
            height: var(--sd-nav-height-mobile);
        }
        .sd-header-inner {
            justify-content: space-between;
        }
        .sd-nav-left,
        .sd-nav-right {
            display: none;
        }
        .sd-hamburger {
            display: block;
        }
        .sd-logo-wrap {
            padding: 0;
        }
        .sd-mobile-menu {
            display: block;
        }
        .sd-category-banner-inner {
            flex-direction: column;
            align-items: stretch;
        }
        .sd-category-banner-img {
            flex: 0 0 200px;
        }
        .sd-filter-layout {
            grid-template-columns: 1fr;
        }
        .sd-filter-sidebar {
            position: static;
        }
        .sd-review-card {
            flex-direction: column;
        }
        .sd-review-card-img {
            flex: 0 0 160px;
            height: 160px;
        }
        .sd-entry-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .sd-stats-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .sd-topic-grid {
            grid-template-columns: 1fr;
        }
        .sd-footer-grid {
            grid-template-columns: 1fr 1fr;
        }
    }
    @media (max-width: 767px) {
        .sd-section {
            padding: var(--sd-section-gap-mobile) 0;
        }
        .sd-category-banner {
            padding: 28px 0 24px;
        }
        .sd-category-banner h1 {
            font-size: 26px;
        }
        .sd-review-card {
            padding: 12px;
        }
        .sd-review-card-img {
            height: 140px;
            flex: 0 0 140px;
        }
        .sd-review-card h3 {
            font-size: 17px;
        }
        .sd-subscribe-box {
            flex-direction: column;
            align-items: stretch;
        }
        .sd-subscribe-form {
            max-width: 100%;
        }
        .sd-footer-grid {
            grid-template-columns: 1fr;
            gap: 24px;
        }
        .sd-footer-bottom {
            flex-direction: column;
            text-align: center;
        }
    }
    @media (max-width: 575px) {
        .sd-entry-grid {
            grid-template-columns: 1fr;
        }
        .sd-stats-grid {
            grid-template-columns: 1fr;
        }
        .sd-reco-bar {
            flex-direction: column;
            align-items: flex-start;
        }
        .sd-subscribe-form {
            flex-direction: column;
        }
        .sd-subscribe-form input {
            width: 100%;
        }
    }

/* roulang page: category5 */
:root {
      --sd-primary: #1752B0;
      --sd-primary-dark: #0F3E88;
      --sd-accent: #F59E1B;
      --sd-accent-dark: #D9820A;
      --sd-bg: #F6F8FB;
      --sd-surface: #FFFFFF;
      --sd-text-strong: #16233B;
      --sd-text: #3A4658;
      --sd-text-muted: #6B7790;
      --sd-text-disabled: #A0A8B8;
      --sd-border: #E5EAF2;
      --sd-divider: #EEF2F7;
      --sd-radius-sm: 8px;
      --sd-radius-md: 12px;
      --sd-radius-lg: 16px;
      --sd-shadow-card: 0 8px 28px rgba(22, 87, 179, .08);
      --sd-shadow-card-hover: 0 12px 32px rgba(22, 87, 179, .16);
      --sd-font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      --sd-font-mono: "Roboto Mono", "SFMono-Regular", monospace;
      --sd-nav-height: 72px;
      --sd-nav-height-mobile: 60px;
      --sd-section-gap: 72px;
      --sd-section-gap-mobile: 48px;
      --sd-break-xl: 1200px;
      --sd-break-lg: 992px;
      --sd-break-md: 768px;
      --sd-break-sm: 576px;
      --sd-transition: .18s ease;
    }

    html { scroll-behavior: smooth; }
    body {
      font-family: var(--sd-font-sans);
      background-color: var(--sd-bg);
      color: var(--sd-text);
      font-size: 15px;
      line-height: 1.8;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    a { text-decoration: none; color: var(--sd-primary); transition: color var(--sd-transition); }
    a:hover { color: var(--sd-primary-dark); }
    a:focus-visible, button:focus-visible { outline: 2px solid var(--sd-primary); outline-offset: 2px; }
    img { max-width: 100%; display: block; }
    ul { padding-left: 0; margin-bottom: 0; list-style: none; }

    .sd-container { width: 100%; max-width: 1200px; margin-left: auto; margin-right: auto; padding-left: 20px; padding-right: 20px; }

    /* Header */
    .sd-header {
      position: sticky; top: 0; z-index: 1050; background: rgba(255,255,255,.98);
      backdrop-filter: blur(10px); box-shadow: 0 1px 0 var(--sd-border), 0 6px 18px rgba(22,87,179,.04);
      height: var(--sd-nav-height); display: flex; align-items: center;
    }
    .sd-header-inner { display: flex; align-items: center; justify-content: space-between; width: 100%; }
    .sd-nav-left, .sd-nav-right { display: flex; align-items: center; gap: 26px; flex: 1; }
    .sd-nav-left { justify-content: flex-start; }
    .sd-nav-right { justify-content: flex-end; }
    .sd-logo-wrap { flex-shrink: 0; padding: 0 18px; }
    .sd-logo { display: inline-flex; align-items: center; gap: 9px; font-weight: 800; font-size: 21px; color: var(--sd-text-strong); letter-spacing: -0.3px; white-space: nowrap; }
    .sd-logo:hover { color: var(--sd-primary); }
    .sd-logo-icon { width: 36px; height: 36px; background: linear-gradient(135deg, var(--sd-primary), #3A7BDE); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; box-shadow: 0 6px 16px rgba(22,87,179,.24); }
    .sd-nav-link { font-size: 15px; font-weight: 500; color: var(--sd-text); padding: 6px 2px; position: relative; transition: color var(--sd-transition); }
    .sd-nav-link::after { content: ""; position: absolute; left: 50%; bottom: -2px; width: 0; height: 2px; background: var(--sd-primary); border-radius: 2px; transition: width .18s ease, left .18s ease; }
    .sd-nav-link:hover { color: var(--sd-primary); }
    .sd-nav-link:hover::after, .sd-nav-link.active::after { width: 100%; left: 0; }
    .sd-nav-link.active { color: var(--sd-primary); font-weight: 700; }
    .sd-hamburger { display: none; background: none; border: none; font-size: 24px; color: var(--sd-text-strong); cursor: pointer; padding: 4px 8px; border-radius: 6px; }
    .sd-hamburger:hover { background: var(--sd-bg); }

    .sd-mobile-menu { display: none; position: fixed; top: 0; left: 0; width: 300px; max-width: 80vw; height: 100vh; background: #fff; box-shadow: 8px 0 30px rgba(22,87,179,.12); z-index: 1100; padding: 24px 20px; transform: translateX(-100%); transition: transform .22s ease; overflow-y: auto; }
    .sd-mobile-menu.open { transform: translateX(0); }
    .sd-mobile-menu-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
    .sd-mobile-close { background: none; border: none; font-size: 26px; color: var(--sd-text-strong); cursor: pointer; }
    .sd-mobile-menu a.sd-nav-link { display: block; margin: 12px 0; font-size: 17px; }
    .sd-mobile-menu .sd-logo { margin-bottom: 20px; }
    .sd-menu-overlay { display: none; position: fixed; inset: 0; background: rgba(15,21,35,.4); z-index: 1090; }

    /* Section base */
    .sd-section { padding: var(--sd-section-gap) 0; }
    .sd-section-light { background: #fff; }
    .sd-section-highlight { background: linear-gradient(180deg, #FFFFFF 0%, #F6F8FB 100%); }
    .sd-section-title { font-size: 28px; font-weight: 800; color: var(--sd-text-strong); line-height: 1.3; letter-spacing: -0.5px; margin-bottom: 10px; }
    .sd-section-sub { font-size: 16px; color: var(--sd-text-muted); margin-bottom: 32px; max-width: 720px; }
    .sd-text-accent { color: var(--sd-accent); }
    .sd-text-primary { color: var(--sd-primary); }

    /* Cards */
    .sd-card { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius-md); box-shadow: var(--sd-shadow-card); transition: transform var(--sd-transition), box-shadow var(--sd-transition); }
    .sd-card:hover { transform: translateY(-4px); box-shadow: var(--sd-shadow-card-hover); }
    .sd-card-body { padding: 24px; }
    .sd-card-title { font-size: 20px; font-weight: 700; color: var(--sd-text-strong); line-height: 1.4; margin-bottom: 8px; }
    .sd-card-text { color: var(--sd-text-muted); font-size: 14px; line-height: 1.8; }

    /* Buttons */
    .sd-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 22px; border-radius: var(--sd-radius-sm); font-size: 15px; font-weight: 600; border: 1.5px solid transparent; cursor: pointer; transition: background-color .18s ease, color .18s ease, box-shadow .18s ease, transform .18s ease; }
    .sd-btn-primary { background: var(--sd-primary); color: #fff; border-color: var(--sd-primary); }
    .sd-btn-primary:hover { background: var(--sd-primary-dark); border-color: var(--sd-primary-dark); color: #fff; }
    .sd-btn-outline { background: #fff; color: var(--sd-primary); border-color: var(--sd-primary); }
    .sd-btn-outline:hover { background: #F0F5FF; color: var(--sd-primary-dark); }
    .sd-btn-accent { background: var(--sd-accent); color: #fff; border-color: var(--sd-accent); }
    .sd-btn-accent:hover { background: var(--sd-accent-dark); border-color: var(--sd-accent-dark); color: #fff; }
    .sd-btn-sm { padding: 7px 16px; font-size: 14px; }
    .sd-btn:focus-visible { outline: 2px solid var(--sd-primary); outline-offset: 2px; }

    /* Page header (category banner) */
    .sd-page-header { background: #fff; border-bottom: 1px solid var(--sd-border); padding: 46px 0 36px; }
    .sd-breadcrumb { font-size: 14px; color: var(--sd-text-muted); margin-bottom: 14px; }
    .sd-breadcrumb a { color: var(--sd-text-muted); }
    .sd-breadcrumb a:hover { color: var(--sd-primary); }
    .sd-page-header h1 { font-size: 38px; font-weight: 800; color: var(--sd-text-strong); line-height: 1.25; letter-spacing: -0.5px; margin-bottom: 12px; }
    .sd-page-header .lead { font-size: 16px; color: var(--sd-text-muted); max-width: 720px; line-height: 1.9; }
    .sd-header-image { border-radius: var(--sd-radius-lg); overflow: hidden; box-shadow: var(--sd-shadow-card); height: 190px; object-fit: cover; }

    /* Data board metrics */
    .sd-metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .sd-metric-card { background: linear-gradient(135deg, #0F3E88 0%, #1752B0 100%); border-radius: var(--sd-radius-md); padding: 22px 20px; color: #fff; box-shadow: 0 10px 28px rgba(22,87,179,.18); }
    .sd-metric-number { font-size: 34px; font-weight: 800; font-family: var(--sd-font-mono); line-height: 1.2; margin-bottom: 6px; }
    .sd-metric-label { font-size: 14px; color: #D7E4FA; }
    .sd-metric-trend { display: inline-block; background: rgba(255,255,255,.15); border-radius: 30px; padding: 2px 10px; font-size: 12px; color: #FFE9B8; margin-top: 10px; }

    /* Chart grid */
    .sd-chart-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 32px; }
    .sd-chart-card { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius-md); box-shadow: var(--sd-shadow-card); padding: 24px; }
    .sd-chart-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
    .sd-chart-title { font-size: 18px; font-weight: 700; color: var(--sd-text-strong); margin: 0; }
    .sd-chart-tag { background: #F0F5FF; color: var(--sd-primary); padding: 4px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; }
    .sd-bars { display: flex; align-items: flex-end; gap: 12px; height: 120px; }
    .sd-bar { flex: 1; background: #E5EAF2; border-radius: 4px 4px 0 0; transition: background .2s; }
    .sd-bar.active { background: var(--sd-primary); }
    .sd-bar-label { font-size: 11px; color: var(--sd-text-muted); text-align: center; margin-top: 6px; white-space: nowrap; }
    .sd-line-bars { display: flex; align-items: flex-end; gap: 10px; height: 110px; }
    .sd-line-bar { flex: 1; background: #E5EAF2; border-radius: 4px; position: relative; }
    .sd-line-bar.sd-highlight { background: var(--sd-accent); }
    .sd-line-label { font-size: 11px; color: var(--sd-text-muted); text-align: center; margin-top: 6px; }

    /* Category entry cards */
    .sd-cat-entry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 32px; }
    .sd-cat-entry-card { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius-md); padding: 22px 20px; box-shadow: var(--sd-shadow-card); transition: transform var(--sd-transition), box-shadow var(--sd-transition); }
    .sd-cat-entry-card:hover { transform: translateY(-4px); box-shadow: var(--sd-shadow-card-hover); }
    .sd-cat-entry-card h3 { font-size: 18px; font-weight: 700; color: var(--sd-text-strong); margin-bottom: 8px; }
    .sd-cat-entry-card p { font-size: 14px; color: var(--sd-text-muted); margin-bottom: 16px; line-height: 1.7; }

    /* More button */
    .sd-more-wrap { text-align: center; margin-top: 28px; }

    /* Quick stats */
    .sd-quick-stats { background: linear-gradient(90deg, #0F3E88 0%, #1752B0 100%); border-radius: var(--sd-radius-lg); padding: 34px 32px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 20px; color: #fff; margin-top: 32px; }
    .sd-quick-stat { flex: 1; min-width: 150px; text-align: center; }
    .sd-quick-stat .number { font-size: 28px; font-weight: 800; font-family: var(--sd-font-mono); }
    .sd-quick-stat .label { font-size: 13px; color: #D7E4FA; margin-top: 4px; }

    /* Tag cloud */
    .sd-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
    .sd-tag { display: inline-block; padding: 6px 16px; background: #fff; border: 1px solid var(--sd-border); border-radius: 30px; font-size: 13px; color: var(--sd-text); transition: background .18s ease, color .18s ease, border-color .18s ease; }
    .sd-tag:hover { background: var(--sd-primary); color: #fff; border-color: var(--sd-primary); }

    /* Expert rec */
    .sd-expert-rec { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius-md); box-shadow: var(--sd-shadow-card); padding: 20px 24px; display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-top: 24px; }
    .sd-expert-rec .expert-title { font-size: 20px; font-weight: 700; color: var(--sd-text-strong); }
    .sd-expert-rec .expert-desc { font-size: 14px; color: var(--sd-text-muted); margin-top: 4px; }

    /* Subscription */
    .sd-subscribe-card { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius-lg); box-shadow: var(--sd-shadow-card); padding: 30px 32px; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
    .sd-subscribe-form { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
    .sd-input { width: 280px; padding: 10px 16px; border: 1px solid var(--sd-border); border-radius: var(--sd-radius-sm); font-size: 15px; color: var(--sd-text-strong); background: #fff; transition: border-color .18s ease, box-shadow .18s ease; }
    .sd-input:focus { outline: none; border-color: var(--sd-primary); box-shadow: 0 0 0 3px rgba(22,87,179,.12); }
    .sd-input::placeholder { color: var(--sd-text-disabled); }

    /* Timeline */
    .sd-timeline { position: relative; margin-top: 32px; }
    .sd-timeline-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .sd-timeline-item { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius-md); padding: 20px 22px; box-shadow: var(--sd-shadow-card); }
    .sd-timeline-step { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; background: var(--sd-primary); color: #fff; border-radius: 50%; font-size: 14px; font-weight: 700; margin-bottom: 12px; }
    .sd-timeline-item h3 { font-size: 18px; font-weight: 700; color: var(--sd-text-strong); margin-bottom: 8px; }
    .sd-timeline-item p { font-size: 14px; color: var(--sd-text-muted); line-height: 1.7; }

    /* Footer */
    .sd-footer { background: #0F1523; color: #B9C2D6; padding: 50px 0 20px; }
    .sd-footer a { color: #B9C2D6; }
    .sd-footer a:hover { color: #FFFFFF; }
    .sd-footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 30px; margin-bottom: 30px; }
    .sd-footer-brand { display: inline-flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 800; color: #fff; margin-bottom: 14px; }
    .sd-footer-desc { color: #B9C2D6; font-size: 14px; line-height: 1.8; margin-bottom: 16px; max-width: 320px; }
    .sd-footer-social { display: flex; gap: 12px; }
    .sd-footer-social a { width: 34px; height: 34px; background: rgba(255,255,255,.08); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #fff; transition: background .18s ease; }
    .sd-footer-social a:hover { background: var(--sd-primary); color: #fff; }
    .sd-footer-heading { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 14px; }
    .sd-footer-links li { margin-bottom: 8px; }
    .sd-footer-links a { font-size: 14px; }
    .sd-footer-contact li { display: flex; gap: 8px; align-items: center; font-size: 14px; margin-bottom: 10px; }
    .sd-footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding-top: 16px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; font-size: 13px; }

    /* Responsive */
    @media (max-width: 1199px) {
      .sd-nav-left, .sd-nav-right { gap: 16px; }
    }
    @media (max-width: 991px) {
      .sd-header { height: var(--sd-nav-height-mobile); }
      .sd-hamburger { display: block; }
      .sd-nav-left, .sd-nav-right { display: none; }
      .sd-logo-wrap { padding: 0; margin: 0 auto; }
      .sd-mobile-menu { display: block; }
      .sd-menu-overlay { display: block; }
      .sd-metric-grid { grid-template-columns: repeat(2, 1fr); }
      .sd-chart-grid { grid-template-columns: 1fr; }
      .sd-cat-entry-grid { grid-template-columns: repeat(2, 1fr); }
      .sd-timeline-grid { grid-template-columns: repeat(2, 1fr); }
      .sd-footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 767px) {
      .sd-cat-entry-grid, .sd-timeline-grid { grid-template-columns: 1fr; }
      .sd-quick-stats { flex-direction: column; }
      .sd-subscribe-card { flex-direction: column; align-items: stretch; }
      .sd-subscribe-form { flex-direction: column; }
      .sd-input { width: 100%; }
      .sd-expert-rec { flex-direction: column; align-items: flex-start; }
    }
    @media (max-width: 575px) {
      .sd-section { padding: var(--sd-section-gap-mobile) 0; }
      .sd-page-header { padding: 32px 0 28px; }
      .sd-page-header h1 { font-size: 30px; }
      .sd-metric-grid { grid-template-columns: 1fr; }
      .sd-quick-stats { padding: 24px 20px; }
      .sd-footer-grid { grid-template-columns: 1fr; }
      .sd-footer-bottom { flex-direction: column; text-align: center; }
    }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}