/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a3a;
            --primary-light: #2c3e50;
            --primary-dark: #0f1a26;
            --accent: #c9a84c;
            --accent-light: #e0c06a;
            --accent-dark: #a88a30;
            --bg-body: #f8f7f4;
            --bg-card: #ffffff;
            --bg-dark: #1a2a3a;
            --text-primary: #1a2a3a;
            --text-secondary: #5a6a7a;
            --text-light: #8a9aaa;
            --text-white: #ffffff;
            --border-color: #e8e5e0;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(26, 42, 58, 0.06);
            --shadow-md: 0 8px 30px rgba(26, 42, 58, 0.08);
            --shadow-lg: 0 20px 60px rgba(26, 42, 58, 0.12);
            --shadow-accent: 0 8px 30px rgba(201, 168, 76, 0.25);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 260px;
            --header-height: 70px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container-custom {
                padding: 0 16px;
            }
        }

        /* ===== Layout Wrapper ===== */
        .layout-wrapper {
            display: flex;
            min-height: 100vh;
        }

        /* ===== Sidebar ===== */
        .sidebar {
            width: var(--sidebar-width);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            background: var(--primary);
            z-index: 1050;
            display: flex;
            flex-direction: column;
            padding: 0;
            transition: transform 0.35s ease;
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.1);
        }

        .sidebar-brand {
            padding: 24px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .sidebar-brand a {
            display: flex;
            align-items: center;
            gap: 12px;
            color: var(--text-white);
            font-size: 22px;
            font-weight: 700;
            letter-spacing: 0.5px;
        }
        .sidebar-brand a:hover {
            color: var(--accent-light);
        }
        .sidebar-brand .brand-icon {
            width: 40px;
            height: 40px;
            background: var(--accent);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--primary);
            font-weight: 800;
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            overflow-y: auto;
        }

        .sidebar-nav .nav-item {
            margin-bottom: 4px;
        }

        .sidebar-nav .nav-link {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }
        .sidebar-nav .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: rgba(255, 255, 255, 0.5);
            transition: var(--transition);
        }
        .sidebar-nav .nav-link:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-white);
        }
        .sidebar-nav .nav-link:hover i {
            color: var(--accent-light);
        }
        .sidebar-nav .nav-link.active {
            background: rgba(201, 168, 76, 0.15);
            color: var(--accent-light);
        }
        .sidebar-nav .nav-link.active i {
            color: var(--accent-light);
        }
        .sidebar-nav .nav-link.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--accent);
            border-radius: 0 4px 4px 0;
        }

        .sidebar-footer {
            padding: 16px 20px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .sidebar-footer small {
            color: rgba(255, 255, 255, 0.35);
            font-size: 12px;
            display: block;
            line-height: 1.5;
        }

        /* ===== Main Content ===== */
        .main-content {
            flex: 1;
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Top Header (mobile) ===== */
        .top-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 1040;
            background: var(--primary);
            padding: 0 16px;
            height: var(--header-height);
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
        }
        .top-header .brand-mobile {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-white);
            font-size: 18px;
            font-weight: 700;
        }
        .top-header .brand-mobile .brand-icon {
            width: 34px;
            height: 34px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: var(--primary);
            font-weight: 800;
        }
        .top-header .btn-menu {
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 24px;
            padding: 8px;
            cursor: pointer;
            border-radius: 8px;
            transition: var(--transition);
        }
        .top-header .btn-menu:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .top-header .btn-menu:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Offcanvas ===== */
        .offcanvas.offcanvas-start {
            width: var(--sidebar-width) !important;
            background: var(--primary) !important;
        }
        .offcanvas .offcanvas-header {
            padding: 20px 20px 16px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .offcanvas .offcanvas-header .btn-close {
            filter: brightness(0) invert(1);
            opacity: 0.6;
        }
        .offcanvas .offcanvas-body {
            padding: 12px;
        }
        .offcanvas .offcanvas-body .nav-link {
            color: rgba(255, 255, 255, 0.7);
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
        }
        .offcanvas .offcanvas-body .nav-link i {
            width: 20px;
            text-align: center;
            color: rgba(255, 255, 255, 0.5);
        }
        .offcanvas .offcanvas-body .nav-link:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-white);
        }
        .offcanvas .offcanvas-body .nav-link.active {
            background: rgba(201, 168, 76, 0.15);
            color: var(--accent-light);
        }
        .offcanvas .offcanvas-body .nav-link.active i {
            color: var(--accent-light);
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            padding: 80px 0 100px;
            background: var(--primary-dark);
            overflow: hidden;
            min-height: 520px;
            display: flex;
            align-items: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.3;
            z-index: 0;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 38, 0.92) 0%, rgba(26, 42, 58, 0.75) 100%);
            z-index: 1;
        }
        .hero-section .container-custom {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            background: rgba(201, 168, 76, 0.15);
            border: 1px solid rgba(201, 168, 76, 0.3);
            border-radius: 50px;
            color: var(--accent-light);
            font-size: 13px;
            font-weight: 500;
            margin-bottom: 24px;
            letter-spacing: 0.5px;
        }
        .hero-badge i {
            font-size: 12px;
        }
        .hero-title {
            font-size: 44px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 20px;
            max-width: 720px;
        }
        .hero-title span {
            color: var(--accent-light);
        }
        .hero-desc {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.7;
            max-width: 580px;
            margin-bottom: 36px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: var(--accent);
            color: var(--primary);
            font-weight: 700;
            font-size: 16px;
            border: none;
            border-radius: 50px;
            transition: var(--transition);
            cursor: pointer;
            box-shadow: var(--shadow-accent);
        }
        .btn-accent:hover {
            background: var(--accent-light);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(201, 168, 76, 0.35);
        }
        .btn-accent:active {
            transform: translateY(0);
        }
        .btn-outline-light-custom {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: transparent;
            color: var(--text-white);
            font-weight: 600;
            font-size: 16px;
            border: 2px solid rgba(255, 255, 255, 0.25);
            border-radius: 50px;
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-outline-light-custom:hover {
            border-color: var(--accent);
            color: var(--accent-light);
            background: rgba(201, 168, 76, 0.08);
            transform: translateY(-2px);
        }
        .btn-outline-light-custom:active {
            transform: translateY(0);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-top: 50px;
            padding-top: 36px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .hero-stat-item {
            text-align: left;
        }
        .hero-stat-item .number {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
        }
        .hero-stat-item .number span {
            color: var(--accent-light);
        }
        .hero-stat-item .label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 4px;
        }

        /* ===== Section Common ===== */
        .section-padding {
            padding: 80px 0;
        }
        .section-padding-sm {
            padding: 56px 0;
        }
        .section-title {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.25;
        }
        .section-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 620px;
            line-height: 1.7;
        }
        .section-header {
            margin-bottom: 48px;
        }
        .section-header .section-subtitle {
            margin-top: 8px;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            background: rgba(201, 168, 76, 0.1);
            border-radius: 50px;
            color: var(--accent-dark);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .section-tag i {
            font-size: 11px;
        }

        /* ===== Features /优势 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 40px 32px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }
        .feature-card::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s ease;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .feature-card:hover::after {
            transform: scaleX(1);
        }
        .feature-card .icon-box {
            width: 56px;
            height: 56px;
            background: rgba(201, 168, 76, 0.1);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--accent-dark);
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .feature-card:hover .icon-box {
            background: var(--accent);
            color: var(--primary);
        }
        .feature-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .feature-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ===== Login Methods /登录方式 ===== */
        .methods-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .method-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            display: flex;
            align-items: flex-start;
            gap: 20px;
            transition: var(--transition);
        }
        .method-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .method-card .method-icon {
            width: 48px;
            height: 48px;
            background: rgba(201, 168, 76, 0.08);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--accent-dark);
            flex-shrink: 0;
        }
        .method-card .method-info h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .method-card .method-info p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 0;
        }
        .method-card .method-tag {
            display: inline-block;
            padding: 2px 12px;
            background: rgba(201, 168, 76, 0.08);
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            color: var(--accent-dark);
            margin-top: 8px;
        }

        /* ===== Guide Categories /分类入口 ===== */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .category-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .category-card .card-img {
            height: 180px;
            overflow: hidden;
            position: relative;
        }
        .category-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .category-card:hover .card-img img {
            transform: scale(1.05);
        }
        .category-card .card-img .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(0deg, rgba(26, 42, 58, 0.3) 0%, transparent 60%);
        }
        .category-card .card-body {
            padding: 24px 24px 28px;
        }
        .category-card .card-body h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .category-card .card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 16px;
        }
        .category-card .card-body .btn-link-custom {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--accent-dark);
            font-weight: 600;
            font-size: 14px;
            transition: var(--transition);
        }
        .category-card .card-body .btn-link-custom i {
            font-size: 12px;
            transition: transform 0.3s ease;
        }
        .category-card .card-body .btn-link-custom:hover {
            color: var(--primary);
        }
        .category-card .card-body .btn-link-custom:hover i {
            transform: translateX(4px);
        }

        /* ===== Data Stats ===== */
        .stats-section {
            background: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .stats-section .container-custom {
            position: relative;
            z-index: 1;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stat-item .stat-number {
            font-size: 40px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
        }
        .stat-item .stat-number span {
            color: var(--accent-light);
        }
        .stat-item .stat-label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 6px;
        }

        /* ===== News / CMS List ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .news-card .news-img {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .news-card .news-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .news-card:hover .news-img img {
            transform: scale(1.03);
        }
        .news-card .news-img .news-cat {
            position: absolute;
            top: 14px;
            left: 14px;
            padding: 4px 14px;
            background: rgba(26, 42, 58, 0.75);
            backdrop-filter: blur(6px);
            border-radius: 50px;
            color: var(--text-white);
            font-size: 12px;
            font-weight: 600;
        }
        .news-card .news-body {
            padding: 22px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card .news-body .news-date {
            font-size: 13px;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 6px;
            margin-bottom: 8px;
        }
        .news-card .news-body h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .news-card .news-body h4 a {
            color: var(--text-primary);
        }
        .news-card .news-body h4 a:hover {
            color: var(--accent-dark);
        }
        .news-card .news-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0;
            flex: 1;
        }
        .news-card .news-body .news-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 16px;
            padding-top: 14px;
            border-top: 1px solid var(--border-color);
            font-size: 13px;
            color: var(--text-light);
        }

        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
            color: var(--text-secondary);
            font-size: 16px;
        }
        .news-empty i {
            font-size: 40px;
            color: var(--text-light);
            margin-bottom: 16px;
            display: block;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-card);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 20px 0;
        }
        .faq-item:first-child {
            padding-top: 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            cursor: pointer;
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            padding: 4px 0;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--accent-dark);
        }
        .faq-question:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
            border-radius: 4px;
        }
        .faq-question i {
            font-size: 14px;
            color: var(--text-light);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding-top: 12px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }
        .faq-answer.show {
            display: block;
        }
        .faq-answer p:last-child {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.06;
            z-index: 0;
        }
        .cta-section .container-custom {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-title {
            font-size: 36px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-desc {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn-cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 44px;
            background: var(--accent);
            color: var(--primary);
            font-weight: 700;
            font-size: 17px;
            border: none;
            border-radius: 50px;
            transition: var(--transition);
            cursor: pointer;
            box-shadow: var(--shadow-accent);
        }
        .btn-cta-primary:hover {
            background: var(--accent-light);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(201, 168, 76, 0.35);
        }
        .btn-cta-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 44px;
            background: transparent;
            color: var(--text-white);
            font-weight: 600;
            font-size: 17px;
            border: 2px solid rgba(255, 255, 255, 0.2);
            border-radius: 50px;
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-cta-secondary:hover {
            border-color: var(--accent);
            color: var(--accent-light);
            background: rgba(201, 168, 76, 0.06);
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            padding: 48px 0 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-white);
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .footer-brand .footer-logo .brand-icon {
            width: 36px;
            height: 36px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: var(--primary);
            font-weight: 800;
        }
        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            max-width: 300px;
            line-height: 1.7;
        }
        .footer-col h5 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--accent-light);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
        }
        .footer-bottom small {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom .footer-links {
            display: flex;
            gap: 20px;
        }
        .footer-bottom .footer-links a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom .footer-links a:hover {
            color: var(--accent-light);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1199px) {
            .features-grid {
                gap: 20px;
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .categories-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 28px;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
        }

        @media (max-width: 991px) {
            .sidebar {
                display: none !important;
            }
            .top-header {
                display: flex !important;
            }
            .main-content {
                margin-left: 0 !important;
            }
            .hero-title {
                font-size: 34px;
            }
            .hero-desc {
                font-size: 16px;
            }
            .hero-section {
                padding: 60px 0 70px;
                min-height: auto;
            }
            .hero-stats {
                gap: 24px;
                margin-top: 36px;
                padding-top: 28px;
            }
            .hero-stat-item .number {
                font-size: 26px;
            }
            .section-padding {
                padding: 56px 0;
            }
            .section-title {
                font-size: 28px;
            }
            .methods-grid {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .cta-title {
                font-size: 28px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 767px) {
            .top-header {
                height: 60px;
                padding: 0 12px;
            }
            .top-header .brand-mobile {
                font-size: 16px;
            }
            .top-header .brand-mobile .brand-icon {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }
            .hero-title {
                font-size: 28px;
            }
            .hero-desc {
                font-size: 15px;
                margin-bottom: 28px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn-accent,
            .hero-actions .btn-outline-light-custom {
                justify-content: center;
                padding: 12px 28px;
                font-size: 15px;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
                margin-top: 28px;
                padding-top: 20px;
            }
            .hero-stat-item .number {
                font-size: 24px;
            }
            .section-padding {
                padding: 40px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .section-subtitle {
                font-size: 15px;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .feature-card {
                padding: 28px 24px;
            }
            .categories-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .category-card .card-img {
                height: 150px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .stat-item .stat-number {
                font-size: 30px;
            }
            .news-card .news-img {
                height: 160px;
            }
            .cta-title {
                font-size: 24px;
            }
            .cta-desc {
                font-size: 15px;
                margin-bottom: 28px;
            }
            .cta-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .cta-actions .btn-cta-primary,
            .cta-actions .btn-cta-secondary {
                justify-content: center;
                padding: 14px 32px;
                font-size: 15px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-bottom .footer-links {
                justify-content: center;
                flex-wrap: wrap;
            }
            .container-custom {
                padding: 0 16px;
            }
        }

        @media (max-width: 420px) {
            .hero-title {
                font-size: 24px;
            }
            .section-title {
                font-size: 21px;
            }
            .stat-item .stat-number {
                font-size: 24px;
            }
            .stats-grid {
                gap: 16px;
            }
            .feature-card h3 {
                font-size: 17px;
            }
            .method-card {
                flex-direction: column;
                gap: 12px;
                padding: 24px 20px;
            }
        }

        /* ===== Scrollbar ===== */
        .sidebar-nav::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar-nav::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar-nav::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 10px;
        }
        .sidebar-nav::-webkit-scrollbar-thumb:hover {
            background: rgba(255, 255, 255, 0.25);
        }

        /* ===== Accessibility ===== */
        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                transition-duration: 0.01ms !important;
            }
        }

        /* ===== Utility ===== */
        .text-accent {
            color: var(--accent-dark);
        }
        .bg-accent-soft {
            background: rgba(201, 168, 76, 0.06);
        }
        .gap-2 {
            gap: 8px;
        }
        .gap-3 {
            gap: 16px;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .mt-2 {
            margin-top: 8px;
        }
        .mt-3 {
            margin-top: 16px;
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a2e;
            --primary-light: #2d2d4a;
            --secondary: #4a6cf7;
            --secondary-light: #6b85f9;
            --accent: #6c63ff;
            --accent-light: #8b85ff;
            --success: #10b981;
            --warning: #f59e0b;
            --bg-body: #f5f7fc;
            --bg-card: #ffffff;
            --bg-dark: #0f0f1a;
            --text-primary: #1a1a2e;
            --text-secondary: #4b5563;
            --text-muted: #9ca3af;
            --text-light: #f9fafb;
            --border-color: #e5e7eb;
            --border-light: #f0f2f5;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --sidebar-width: 240px;
            --header-height: 64px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

        a {
            color: var(--secondary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-light);
            text-decoration: none;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        ul,
        ol {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
        }

        /* ===== Container ===== */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== App Layout ===== */
        .app-wrapper {
            display: flex;
            min-height: 100vh;
        }

        /* ===== Sidebar ===== */
        .sidebar {
            width: var(--sidebar-width);
            background: var(--bg-card);
            border-right: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1040;
            display: flex;
            flex-direction: column;
            padding: 0;
            box-shadow: var(--shadow-sm);
            transition: transform 0.35s ease;
        }

        .sidebar-brand {
            padding: 20px 20px 16px;
            display: flex;
            align-items: center;
            gap: 10px;
            border-bottom: 1px solid var(--border-light);
        }

        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--secondary);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            border-radius: var(--radius-sm);
            flex-shrink: 0;
        }

        .brand-text {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            line-height: 1.2;
        }

        .sidebar-nav {
            padding: 12px 12px;
            flex: 1;
            overflow-y: auto;
        }

        .nav-item {
            margin-bottom: 2px;
        }

        .nav-link {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 16px;
            border-radius: var(--radius-md);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            position: relative;
        }

        .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 1.05rem;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .nav-link:hover {
            background: rgba(74, 108, 247, 0.07);
            color: var(--secondary);
        }
        .nav-link:hover i {
            color: var(--secondary);
        }

        .nav-link.active {
            background: rgba(74, 108, 247, 0.12);
            color: var(--secondary);
            font-weight: 600;
        }
        .nav-link.active i {
            color: var(--secondary);
        }
        .nav-link.active::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--secondary);
            border-radius: 0 3px 3px 0;
        }

        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-light);
            font-size: 0.8rem;
            color: var(--text-muted);
            text-align: center;
        }

        /* ===== Main Content ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            background: var(--bg-card);
            border-bottom: 1px solid var(--border-color);
            padding: 0 20px;
            height: var(--header-height);
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 1030;
            box-shadow: var(--shadow-sm);
        }

        .mobile-brand {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
        }

        .mobile-toggle {
            background: none;
            border: none;
            font-size: 1.4rem;
            color: var(--text-secondary);
            cursor: pointer;
            padding: 6px 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .mobile-toggle:hover {
            background: rgba(74, 108, 247, 0.07);
            color: var(--secondary);
        }

        /* Mobile overlay */
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.45);
            z-index: 1035;
            opacity: 0;
            transition: opacity 0.35s ease;
        }
        .sidebar-overlay.show {
            opacity: 1;
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            padding: 80px 0 72px;
            background: linear-gradient(135deg, #1a1a2e 0%, #2d2d4a 50%, #1a1a2e 100%);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.18;
            mix-blend-mode: overlay;
        }

        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 20% 80%, rgba(74, 108, 247, 0.25) 0%, transparent 70%),
                radial-gradient(ellipse at 80% 20%, rgba(108, 99, 255, 0.15) 0%, transparent 60%);
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 780px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 20px;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .hero-badge i {
            font-size: 0.75rem;
            color: var(--success);
        }

        .page-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }

        .page-hero .hero-sub {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 600px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }

        .hero-actions {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Buttons ===== */
        .btn-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            justify-content: center;
        }

        .btn-primary-custom {
            background: var(--secondary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(74, 108, 247, 0.35);
        }
        .btn-primary-custom:hover {
            background: var(--secondary-light);
            color: #fff;
            box-shadow: 0 8px 28px rgba(74, 108, 247, 0.45);
            transform: translateY(-2px);
        }

        .btn-outline-custom {
            background: transparent;
            color: rgba(255, 255, 255, 0.9);
            border: 1.5px solid rgba(255, 255, 255, 0.3);
        }
        .btn-outline-custom:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.5);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-secondary-custom {
            background: var(--bg-card);
            color: var(--text-primary);
            box-shadow: var(--shadow-sm);
        }
        .btn-secondary-custom:hover {
            background: var(--bg-body);
            color: var(--secondary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        /* ===== Section ===== */
        .section-block {
            padding: 80px 0;
        }

        .section-block-alt {
            background: var(--bg-card);
        }

        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 52px;
        }

        .section-header .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--secondary);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 8px;
            background: rgba(74, 108, 247, 0.08);
            padding: 4px 16px;
            border-radius: 50px;
        }

        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }

        .section-header p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Cards ===== */
        .card-custom {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            height: 100%;
        }

        .card-custom:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: transparent;
        }

        .card-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            font-size: 1.4rem;
            margin-bottom: 18px;
            color: #fff;
        }

        .card-icon.blue {
            background: linear-gradient(135deg, #4a6cf7, #6b85f9);
        }
        .card-icon.green {
            background: linear-gradient(135deg, #10b981, #34d399);
        }
        .card-icon.purple {
            background: linear-gradient(135deg, #6c63ff, #8b85ff);
        }
        .card-icon.orange {
            background: linear-gradient(135deg, #f59e0b, #fbbf24);
        }
        .card-icon.rose {
            background: linear-gradient(135deg, #ec4899, #f472b6);
        }
        .card-icon.teal {
            background: linear-gradient(135deg, #14b8a6, #5eead4);
        }

        .card-custom h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .card-custom p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        .card-custom .card-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--secondary);
            background: rgba(74, 108, 247, 0.08);
            padding: 2px 12px;
            border-radius: 50px;
            margin-top: 12px;
        }

        /* ===== Step Flow ===== */
        .step-flow {
            display: flex;
            gap: 24px;
            position: relative;
        }

        .step-flow::before {
            content: '';
            position: absolute;
            top: 48px;
            left: 60px;
            right: 60px;
            height: 2px;
            background: var(--border-color);
            z-index: 0;
        }

        .step-item {
            flex: 1;
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--bg-body);
            padding: 0 8px;
        }

        .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--secondary);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            margin-bottom: 16px;
            box-shadow: 0 4px 16px rgba(74, 108, 247, 0.3);
        }

        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .step-item p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
            max-width: 200px;
            margin: 0 auto;
        }

        /* ===== Badge ===== */
        .badge-custom {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 600;
        }

        .badge-safe {
            background: rgba(16, 185, 129, 0.12);
            color: var(--success);
        }
        .badge-safe i {
            font-size: 0.7rem;
        }

        .badge-hot {
            background: rgba(245, 158, 11, 0.12);
            color: var(--warning);
        }

        .badge-new {
            background: rgba(74, 108, 247, 0.12);
            color: var(--secondary);
        }

        /* ===== Feature Grid ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }

        /* ===== Cover Card ===== */
        .cover-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            height: 100%;
        }

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

        .cover-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: 1px solid var(--border-light);
        }

        .cover-card-body {
            padding: 20px 24px 24px;
        }

        .cover-card-body h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .cover-card-body p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 12px;
        }

        .cover-card-body .cover-link {
            font-weight: 600;
            font-size: 0.88rem;
            color: var(--secondary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .cover-card-body .cover-link:hover {
            gap: 8px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            background: var(--bg-card);
        }

        .faq-item {
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.98rem;
            color: var(--text-primary);
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
            gap: 12px;
        }

        .faq-question:hover {
            background: rgba(74, 108, 247, 0.03);
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            color: var(--secondary);
            font-size: 0.85rem;
            transition: var(--transition);
        }

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

        .faq-answer {
            padding: 0 24px 0;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #1a1a2e 0%, #2d2d4a 50%, #1a1a2e 100%);
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.10;
            mix-blend-mode: overlay;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 70% 30%, rgba(74, 108, 247, 0.2) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
        }

        .cta-content h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }

        .cta-content p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 28px;
            line-height: 1.7;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 32px;
            margin-top: auto;
        }

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

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col h5 {
            font-size: 0.92rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

        .footer-col ul li {
            margin-bottom: 6px;
        }

        .footer-col ul li a {
            font-size: 0.85rem;
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-bottom small {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .footer-links {
            display: flex;
            gap: 16px;
        }

        .footer-links a {
            font-size: 0.8rem;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .page-hero h1 {
                font-size: 2.2rem;
            }
            .section-header h2 {
                font-size: 1.8rem;
            }
            .step-flow::before {
                display: none;
            }
            .step-flow {
                flex-wrap: wrap;
                justify-content: center;
            }
            .step-item {
                flex: 0 0 45%;
                background: transparent;
            }
            .step-item p {
                max-width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }

            .main-content {
                margin-left: 0;
            }

            .mobile-header {
                display: flex;
            }

            .sidebar-overlay.show {
                display: block;
            }

            .page-hero {
                padding: 56px 0 48px;
                min-height: 260px;
            }
            .page-hero h1 {
                font-size: 1.8rem;
            }
            .page-hero .hero-sub {
                font-size: 1rem;
            }

            .section-block {
                padding: 52px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }

            .feature-grid {
                grid-template-columns: 1fr;
            }

            .step-item {
                flex: 0 0 100%;
                max-width: 320px;
            }

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

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn-custom {
                width: 100%;
                max-width: 280px;
            }

            .cover-card img {
                height: 160px;
            }
        }

        @media (max-width: 520px) {
            .container-custom {
                padding: 0 16px;
            }

            .page-hero h1 {
                font-size: 1.5rem;
            }
            .page-hero .hero-sub {
                font-size: 0.92rem;
            }

            .section-header h2 {
                font-size: 1.3rem;
            }

            .card-custom {
                padding: 24px 20px;
            }

            .faq-question {
                font-size: 0.9rem;
                padding: 14px 16px;
            }
            .faq-answer {
                font-size: 0.85rem;
            }

            .cta-content h2 {
                font-size: 1.5rem;
            }

            .sidebar-brand .brand-text {
                font-size: 0.95rem;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mb-1 {
            margin-bottom: 8px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .mb-3 {
            margin-bottom: 24px;
        }
        .mt-2 {
            margin-top: 16px;
        }
        .mt-3 {
            margin-top: 24px;
        }
        .gap-sm {
            gap: 12px;
        }
        .gap-md {
            gap: 24px;
        }

        /* ===== Scrollbar ===== */
        .sidebar-nav::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar-nav::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar-nav::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 4px;
        }
        .sidebar-nav::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ===== Focus ===== */
        a:focus-visible,
        button:focus-visible,
        .nav-link:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-wrap {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            padding: 0 0 16px;
            justify-content: center;
        }
        .breadcrumb-wrap a {
            color: rgba(255, 255, 255, 0.7);
        }
        .breadcrumb-wrap a:hover {
            color: #fff;
        }
        .breadcrumb-wrap span {
            color: rgba(255, 255, 255, 0.9);
        }
        .breadcrumb-wrap .sep {
            color: rgba(255, 255, 255, 0.35);
        }

        /* ===== Tag List ===== */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
        }
        .tag-list .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 500;
            background: rgba(74, 108, 247, 0.06);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .tag-list .tag:hover {
            background: rgba(74, 108, 247, 0.12);
            color: var(--secondary);
            border-color: var(--secondary);
        }

/* roulang page: article */
:root {
            --primary: #7c3aed;
            --primary-dark: #5b21b6;
            --primary-light: #a78bfa;
            --primary-bg: #f5f3ff;
            --secondary: #ec4899;
            --accent: #06b6d4;
            --success: #10b981;
            --warning: #f59e0b;
            --dark: #0f172a;
            --dark-soft: #1e293b;
            --gray-900: #111827;
            --gray-800: #1f2937;
            --gray-700: #374151;
            --gray-600: #4b5563;
            --gray-500: #6b7280;
            --gray-400: #9ca3af;
            --gray-300: #d1d5db;
            --gray-200: #e5e7eb;
            --gray-100: #f3f4f6;
            --gray-50: #f9fafb;
            --white: #ffffff;
            --bg-body: #f8f7fc;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border-color: #e2e8f0;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
            --header-height: 0px;
        }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-size: 16px; }
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            overflow-x: hidden;
            padding-left: var(--sidebar-width);
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        .container-custom { max-width: 1200px; margin: 0 auto; padding: 0 24px; width: 100%; }

        /* ===== 左侧导航 ===== */
        .sidebar {
            position: fixed; top: 0; left: 0; width: var(--sidebar-width); height: 100vh; z-index: 1050;
            background: var(--white); border-right: 1px solid var(--border-color);
            display: flex; flex-direction: column; transition: var(--transition);
            box-shadow: 2px 0 12px rgba(0,0,0,0.04);
        }
        .sidebar-brand {
            padding: 24px 20px 20px; border-bottom: 1px solid var(--border-color);
            display: flex; align-items: center; gap: 12px;
        }
        .sidebar-brand .brand-icon {
            width: 40px; height: 40px; border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex; align-items: center; justify-content: center;
            color: var(--white); font-weight: 800; font-size: 1.1rem; flex-shrink: 0;
        }
        .sidebar-brand .brand-text {
            font-weight: 700; font-size: 1.05rem; color: var(--dark);
            line-height: 1.3; letter-spacing: -0.01em;
        }
        .sidebar-brand .brand-text span { color: var(--primary); }
        .sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }
        .sidebar-nav .nav-item { margin-bottom: 4px; }
        .sidebar-nav .nav-link {
            display: flex; align-items: center; gap: 14px; padding: 12px 16px;
            border-radius: var(--radius-md); color: var(--text-secondary); font-weight: 500;
            font-size: 0.95rem; transition: var(--transition); position: relative;
        }
        .sidebar-nav .nav-link i { width: 20px; text-align: center; font-size: 1.1rem; flex-shrink: 0; }
        .sidebar-nav .nav-link:hover { background: var(--primary-bg); color: var(--primary); }
        .sidebar-nav .nav-link.active {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: var(--white); box-shadow: 0 4px 14px rgba(124,58,237,0.35);
        }
        .sidebar-nav .nav-link.active::after {
            content: ''; position: absolute; right: -12px; top: 50%; transform: translateY(-50%);
            width: 4px; height: 24px; background: var(--primary); border-radius: 0 4px 4px 0;
        }
        .sidebar-footer {
            padding: 16px 20px; border-top: 1px solid var(--border-color);
            font-size: 0.75rem; color: var(--text-muted); text-align: center;
        }

        /* ===== 移动端导航切换 ===== */
        .navbar-toggler-custom {
            display: none; position: fixed; top: 0; left: 0; right: 0; z-index: 1040;
            background: var(--white); border-bottom: 1px solid var(--border-color);
            padding: 14px 20px; align-items: center; justify-content: space-between;
            box-shadow: var(--shadow-sm);
        }
        .navbar-toggler-custom .brand-row { display: flex; align-items: center; gap: 10px; }
        .navbar-toggler-custom .brand-row .brand-icon {
            width: 34px; height: 34px; border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex; align-items: center; justify-content: center;
            color: var(--white); font-weight: 800; font-size: 0.95rem;
        }
        .navbar-toggler-custom .brand-row .brand-text {
            font-weight: 700; font-size: 0.95rem; color: var(--dark);
        }
        .navbar-toggler-custom .btn-menu {
            background: none; border: none; font-size: 1.5rem; color: var(--gray-700);
            padding: 4px 8px; cursor: pointer; border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .navbar-toggler-custom .btn-menu:hover { background: var(--gray-100); }
        .sidebar-overlay {
            display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4);
            z-index: 1045; backdrop-filter: blur(4px);
        }
        .sidebar-overlay.show { display: block; }
        .sidebar.mobile-show { transform: translateX(0); }

        /* ===== 主内容区 ===== */
        .main-content { min-height: 100vh; display: flex; flex-direction: column; }

        /* ===== 文章 Banner ===== */
        .article-banner {
            position: relative; padding: 60px 0 50px; background: var(--dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover; background-position: center; background-blend-mode: overlay;
            overflow: hidden;
        }
        .article-banner::before {
            content: ''; position: absolute; inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(30,27,75,0.75) 100%);
        }
        .article-banner .container-custom { position: relative; z-index: 1; }
        .article-banner .breadcrumb-custom {
            display: flex; align-items: center; gap: 8px; margin-bottom: 20px;
            font-size: 0.85rem; color: rgba(255,255,255,0.6);
        }
        .article-banner .breadcrumb-custom a { color: rgba(255,255,255,0.7); }
        .article-banner .breadcrumb-custom a:hover { color: var(--white); }
        .article-banner .breadcrumb-custom .sep { color: rgba(255,255,255,0.3); }
        .article-banner .breadcrumb-custom .current { color: var(--white); font-weight: 500; }
        .article-banner .banner-category {
            display: inline-block; padding: 4px 14px; border-radius: 20px;
            background: rgba(124,58,237,0.3); color: var(--primary-light);
            font-size: 0.8rem; font-weight: 600; letter-spacing: 0.5px;
            backdrop-filter: blur(4px); border: 1px solid rgba(167,139,250,0.25);
            margin-bottom: 16px;
        }
        .article-banner h1 {
            font-size: 2.4rem; font-weight: 800; color: var(--white);
            line-height: 1.3; margin-bottom: 16px; max-width: 860px;
            letter-spacing: -0.02em;
        }
        .article-banner .banner-meta {
            display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
            color: rgba(255,255,255,0.65); font-size: 0.9rem;
        }
        .article-banner .banner-meta i { margin-right: 6px; }
        .article-banner .banner-meta span { display: flex; align-items: center; }

        /* ===== 文章主体 ===== */
        .article-body-wrap { padding: 48px 0 60px; }
        .article-body {
            background: var(--white); border-radius: var(--radius-lg);
            padding: 48px 56px; box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
        }
        .article-body .article-content {
            font-size: 1.05rem; line-height: 1.9; color: var(--text-primary);
        }
        .article-body .article-content p { margin-bottom: 1.2em; }
        .article-body .article-content h2, 
        .article-body .article-content h3 { margin-top: 1.6em; margin-bottom: 0.6em; font-weight: 700; color: var(--dark); }
        .article-body .article-content h2 { font-size: 1.6rem; }
        .article-body .article-content h3 { font-size: 1.25rem; }
        .article-body .article-content ul, 
        .article-body .article-content ol { margin-bottom: 1.2em; padding-left: 1.5em; }
        .article-body .article-content li { margin-bottom: 0.4em; }
        .article-body .article-content img { border-radius: var(--radius-md); margin: 1.5em 0; }
        .article-body .article-content a { color: var(--primary); font-weight: 500; }
        .article-body .article-content blockquote {
            border-left: 4px solid var(--primary); padding: 12px 20px;
            background: var(--primary-bg); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 1.5em 0; color: var(--text-secondary);
        }
        .article-body .article-content code {
            background: var(--gray-100); padding: 2px 8px; border-radius: 4px;
            font-size: 0.9em; color: var(--secondary);
        }
        .article-body .article-content pre {
            background: var(--dark); color: #e2e8f0; padding: 20px 24px;
            border-radius: var(--radius-md); overflow-x: auto; margin: 1.5em 0;
            font-size: 0.9rem; line-height: 1.6;
        }
        .article-body .article-content table {
            width: 100%; border-collapse: collapse; margin: 1.5em 0;
        }
        .article-body .article-content th, 
        .article-body .article-content td {
            padding: 10px 16px; border: 1px solid var(--border-color); text-align: left;
        }
        .article-body .article-content th { background: var(--gray-100); font-weight: 600; }

        /* ===== 文章标签 & 分享 ===== */
        .article-tags-share {
            margin-top: 40px; padding-top: 28px;
            border-top: 1px solid var(--border-color);
            display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
        }
        .article-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
        .article-tags .tag-label { font-weight: 600; color: var(--text-secondary); font-size: 0.9rem; }
        .article-tags .tag {
            display: inline-block; padding: 4px 14px; border-radius: 20px;
            background: var(--primary-bg); color: var(--primary); font-size: 0.8rem;
            font-weight: 500; transition: var(--transition);
        }
        .article-tags .tag:hover { background: var(--primary); color: var(--white); }
        .article-share { display: flex; align-items: center; gap: 8px; }
        .article-share .share-label { font-weight: 600; color: var(--text-secondary); font-size: 0.9rem; }
        .article-share .share-btn {
            width: 36px; height: 36px; border-radius: 50%; display: flex;
            align-items: center; justify-content: center; transition: var(--transition);
            background: var(--gray-100); color: var(--text-secondary); border: none; cursor: pointer;
        }
        .article-share .share-btn:hover { background: var(--primary); color: var(--white); transform: translateY(-2px); }

        /* ===== 文章导航（上下篇） ===== */
        .article-nav-links {
            margin-top: 32px; display: flex; justify-content: space-between; gap: 20px;
        }
        .article-nav-links .nav-link-item {
            flex: 1; padding: 16px 20px; border-radius: var(--radius-md);
            background: var(--gray-50); border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .article-nav-links .nav-link-item:hover { background: var(--primary-bg); border-color: var(--primary-light); }
        .article-nav-links .nav-link-item .nav-label {
            font-size: 0.8rem; color: var(--text-muted); margin-bottom: 4px;
        }
        .article-nav-links .nav-link-item .nav-title {
            font-weight: 600; color: var(--text-primary); font-size: 0.95rem;
        }
        .article-nav-links .nav-link-item.next { text-align: right; }

        /* ===== 推荐文章 ===== */
        .related-section { padding: 0 0 60px; }
        .related-section .section-title {
            font-size: 1.6rem; font-weight: 700; color: var(--dark);
            margin-bottom: 8px; letter-spacing: -0.01em;
        }
        .related-section .section-subtitle { color: var(--text-secondary); margin-bottom: 32px; }
        .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .related-card {
            background: var(--white); border-radius: var(--radius-md);
            overflow: hidden; border: 1px solid var(--border-color);
            transition: var(--transition); box-shadow: var(--shadow-sm);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .related-card .card-img {
            height: 180px; background: var(--gray-200); position: relative; overflow: hidden;
        }
        .related-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
        .related-card:hover .card-img img { transform: scale(1.05); }
        .related-card .card-body { padding: 20px; }
        .related-card .card-body .card-cat {
            font-size: 0.75rem; color: var(--primary); font-weight: 600;
            text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px;
        }
        .related-card .card-body h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
        .related-card .card-body h4 a { color: var(--dark); }
        .related-card .card-body h4 a:hover { color: var(--primary); }
        .related-card .card-body .card-excerpt {
            font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6;
            display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 60px 0; background: var(--dark);
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover; background-position: center; background-blend-mode: overlay;
            position: relative;
        }
        .cta-section::before {
            content: ''; position: absolute; inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.88) 0%, rgba(91,33,182,0.7) 100%);
        }
        .cta-section .container-custom { position: relative; z-index: 1; text-align: center; }
        .cta-section h2 { font-size: 2rem; font-weight: 800; color: var(--white); margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto 28px; font-size: 1.05rem; }
        .cta-section .btn-cta {
            display: inline-block; padding: 14px 40px; border-radius: 50px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white); font-weight: 600; font-size: 1rem;
            transition: var(--transition); border: none; cursor: pointer;
            box-shadow: 0 4px 20px rgba(124,58,237,0.4);
        }
        .cta-section .btn-cta:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(124,58,237,0.5); color: var(--white); }

        /* ===== FAQ ===== */
        .faq-section { padding: 60px 0; background: var(--white); }
        .faq-section .section-title {
            font-size: 1.6rem; font-weight: 700; color: var(--dark); text-align: center;
            margin-bottom: 8px;
        }
        .faq-section .section-subtitle { text-align: center; color: var(--text-secondary); margin-bottom: 40px; }
        .faq-grid { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--gray-50); border-radius: var(--radius-md);
            border: 1px solid var(--border-color); overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-item .faq-question {
            padding: 18px 24px; display: flex; align-items: center; justify-content: space-between;
            font-weight: 600; color: var(--text-primary); cursor: pointer;
            font-size: 0.95rem; transition: var(--transition);
        }
        .faq-item .faq-question i { transition: var(--transition); color: var(--primary); }
        .faq-item .faq-question.active i { transform: rotate(180deg); }
        .faq-item .faq-answer {
            padding: 0 24px 18px; color: var(--text-secondary); font-size: 0.92rem;
            line-height: 1.7; display: none;
        }
        .faq-item .faq-answer.show { display: block; }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--dark); color: rgba(255,255,255,0.7); padding: 48px 0 32px;
            margin-top: auto;
        }
        .footer .footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 32px; }
        .footer .footer-brand .footer-logo {
            display: flex; align-items: center; gap: 10px; margin-bottom: 12px;
        }
        .footer .footer-brand .footer-logo .brand-icon {
            width: 36px; height: 36px; border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex; align-items: center; justify-content: center;
            color: var(--white); font-weight: 800; font-size: 1rem;
        }
        .footer .footer-brand .footer-logo span { font-weight: 700; font-size: 1.05rem; color: var(--white); }
        .footer .footer-brand p { font-size: 0.88rem; line-height: 1.7; max-width: 320px; }
        .footer .footer-col h5 { color: var(--white); font-weight: 600; margin-bottom: 16px; font-size: 0.95rem; }
        .footer .footer-col ul { list-style: none; padding: 0; }
        .footer .footer-col ul li { margin-bottom: 8px; }
        .footer .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.88rem; transition: var(--transition); }
        .footer .footer-col ul li a:hover { color: var(--primary-light); padding-left: 4px; }
        .footer .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px;
            display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
            font-size: 0.82rem;
        }
        .footer .footer-bottom .footer-links { display: flex; gap: 20px; }
        .footer .footer-bottom .footer-links a { color: rgba(255,255,255,0.5); }
        .footer .footer-bottom .footer-links a:hover { color: var(--white); }

        /* ===== 内容未找到 ===== */
        .not-found-wrap { padding: 80px 0; text-align: center; }
        .not-found-wrap .nf-icon { font-size: 4rem; color: var(--gray-300); margin-bottom: 20px; }
        .not-found-wrap h2 { font-size: 1.6rem; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
        .not-found-wrap p { color: var(--text-secondary); margin-bottom: 24px; }
        .not-found-wrap .btn-back {
            display: inline-block; padding: 12px 32px; border-radius: 50px;
            background: var(--primary); color: var(--white); font-weight: 600;
            transition: var(--transition);
        }
        .not-found-wrap .btn-back:hover { background: var(--primary-dark); color: var(--white); transform: translateY(-2px); }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 768px) {
            body { padding-left: 0; padding-top: 60px; }
            .sidebar { transform: translateX(-100%); }
            .sidebar.mobile-show { transform: translateX(0); box-shadow: var(--shadow-xl); }
            .navbar-toggler-custom { display: flex; }
            .article-banner { padding: 36px 0 32px; }
            .article-banner h1 { font-size: 1.6rem; }
            .article-body { padding: 28px 20px; border-radius: var(--radius-md); }
            .article-body .article-content { font-size: 1rem; }
            .related-grid { grid-template-columns: 1fr; }
            .footer .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer .footer-bottom { flex-direction: column; text-align: center; }
            .article-tags-share { flex-direction: column; align-items: flex-start; }
            .article-nav-links { flex-direction: column; }
            .cta-section h2 { font-size: 1.5rem; }
            .faq-section .section-title { font-size: 1.3rem; }
        }
        @media (max-width: 520px) {
            .article-banner h1 { font-size: 1.3rem; }
            .article-banner .banner-meta { font-size: 0.8rem; gap: 12px; }
            .article-body { padding: 20px 16px; }
            .container-custom { padding: 0 16px; }
            .related-card .card-img { height: 140px; }
            .cta-section { padding: 40px 0; }
            .cta-section h2 { font-size: 1.25rem; }
            .faq-item .faq-question { font-size: 0.88rem; padding: 14px 18px; }
        }