/* roulang page: index */
:root {
            --brand-50: #eff6ff;
            --brand-100: #dbeafe;
            --brand-200: #bfdbfe;
            --brand-500: #3b82f6;
            --brand-600: #2563eb;
            --brand-700: #1d4ed8;
            --accent-500: #f97316;
            --accent-600: #ea580c;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --bg-body: #ffffff;
            --bg-section-alt: #f8fafc;
            --bg-section-dark: #0f172a;
            --border-light: #e2e8f0;
            --radius-lg: 0.75rem;
            --radius-xl: 1rem;
            --radius-2xl: 1.5rem;
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            color: var(--text-primary);
            background: var(--bg-body);
            line-height: 1.6;
            margin: 0;
            padding: 0;
        }

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

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

        button,
        input,
        textarea {
            font-family: inherit;
            transition: var(--transition);
        }

        input:focus,
        textarea:focus,
        button:focus-visible {
            outline: 2px solid var(--brand-500);
            outline-offset: 2px;
        }

        .container-custom {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        @media (min-width: 768px) {
            .container-custom {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        @media (min-width: 1024px) {
            .container-custom {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

        /* ---- Navigation ---- */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.6);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
            transition: var(--transition);
        }

        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }

        .nav-search-input {
            width: 100%;
            max-width: 360px;
            padding: 0.5rem 1rem 0.5rem 2.5rem;
            border: 1px solid var(--border-light);
            border-radius: 9999px;
            background: var(--bg-section-alt);
            font-size: 0.875rem;
            color: var(--text-primary);
            transition: var(--transition);
        }

        .nav-search-input:focus {
            background: #fff;
            border-color: var(--brand-500);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
            outline: none;
        }

        .nav-search-wrap {
            position: relative;
            flex: 1;
            max-width: 400px;
        }

        .nav-search-wrap .search-icon {
            position: absolute;
            left: 0.875rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            pointer-events: none;
            font-size: 0.875rem;
        }

        .nav-link {
            position: relative;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 0.5rem 0.25rem;
            margin: 0 0.625rem;
            transition: var(--transition);
            letter-spacing: 0.01em;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--brand-500);
            border-radius: 2px;
            transition: var(--transition);
        }

        .nav-link:hover {
            color: var(--brand-600);
        }

        .nav-link:hover::after {
            width: 100%;
        }

        .nav-link.active {
            color: var(--brand-600);
        }

        .nav-link.active::after {
            width: 100%;
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 0.25rem;
        }

        .mobile-nav {
            display: none;
            padding: 1rem 0 1.5rem;
            border-top: 1px solid var(--border-light);
            background: #fff;
        }

        .mobile-nav.open {
            display: block;
        }

        .mobile-nav .nav-link {
            display: block;
            padding: 0.75rem 1rem;
            margin: 0;
            border-radius: 0.5rem;
        }

        .mobile-nav .nav-link:hover {
            background: var(--brand-50);
        }

        .mobile-nav .nav-link.active {
            background: var(--brand-50);
        }

        @media (max-width: 768px) {
            .desktop-nav {
                display: none !important;
            }
            .mobile-menu-btn {
                display: block;
            }
            .nav-search-wrap {
                max-width: 200px;
            }
        }

        @media (max-width: 520px) {
            .nav-search-wrap {
                max-width: 140px;
            }
            .nav-search-input {
                font-size: 0.8rem;
                padding-left: 2rem;
            }
            .site-header .container-custom {
                padding-left: 0.75rem;
                padding-right: 0.75rem;
            }
        }

        /* ---- Hero ---- */
        .hero-section {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #0f172a 100%);
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.35;
            mix-blend-mode: overlay;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(59, 130, 246, 0.25) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 50%, rgba(249, 115, 22, 0.15) 0%, transparent 70%);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 3rem 1.25rem;
            max-width: 880px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.12);
            padding: 0.4rem 1.2rem;
            border-radius: 9999px;
            color: rgba(255, 255, 255, 0.9);
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 1.5rem;
            letter-spacing: 0.02em;
        }

        .hero-title {
            font-size: clamp(2.2rem, 6vw, 4.2rem);
            font-weight: 800;
            line-height: 1.15;
            color: #fff;
            margin-bottom: 1.2rem;
            letter-spacing: -0.02em;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }

        .hero-title .highlight {
            background: linear-gradient(135deg, #60a5fa, #a78bfa, #f97316);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-sub {
            font-size: clamp(1rem, 2vw, 1.25rem);
            color: rgba(255, 255, 255, 0.75);
            max-width: 640px;
            margin: 0 auto 2.2rem;
            line-height: 1.7;
            font-weight: 400;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            justify-content: center;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.85rem 2.2rem;
            background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
            color: #fff;
            border: none;
            border-radius: 9999px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(37, 99, 235, 0.5);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.85rem 2.2rem;
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(8px);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 9999px;
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.16);
            border-color: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }

        .hero-scroll {
            position: absolute;
            bottom: 2rem;
            left: 50%;
            transform: translateX(-50%);
            z-index: 2;
            color: rgba(255, 255, 255, 0.4);
            font-size: 1.5rem;
            animation: bounce 2s infinite;
        }

        @keyframes bounce {
            0%,
            100% {
                transform: translateX(-50%) translateY(0);
            }
            50% {
                transform: translateX(-50%) translateY(8px);
            }
        }

        @media (max-width: 640px) {
            .hero-section {
                min-height: 75vh;
            }
            .hero-content {
                padding: 2rem 1rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
        }

        /* ---- Section Common ---- */
        .section-padding {
            padding: 5rem 0;
        }

        @media (max-width: 768px) {
            .section-padding {
                padding: 3rem 0;
            }
        }

        .section-title {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: 0.75rem;
            letter-spacing: -0.01em;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 2.5rem;
            line-height: 1.7;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--brand-500);
            margin-bottom: 0.75rem;
        }

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

        .bg-dark {
            background: var(--bg-section-dark);
            color: #fff;
        }

        .bg-dark .section-title {
            color: #fff;
        }

        .bg-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ---- Cards ---- */
        .card-base {
            background: #fff;
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            overflow: hidden;
        }

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

        .card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            display: block;
        }

        .card-body {
            padding: 1.5rem;
        }

        .card-title {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-primary);
            line-height: 1.4;
        }

        .card-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 500;
            padding: 0.2rem 0.75rem;
            border-radius: 9999px;
            background: var(--brand-50);
            color: var(--brand-600);
            margin-bottom: 0.75rem;
        }

        .card-tag.accent {
            background: #fff7ed;
            color: var(--accent-600);
        }

        /* ---- Stats ---- */
        .stat-card {
            text-align: center;
            padding: 2rem 1.5rem;
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--brand-600);
            line-height: 1.1;
            margin-bottom: 0.25rem;
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .bg-dark .stat-number {
            color: #60a5fa;
        }
        .bg-dark .stat-label {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ---- Step / Timeline ---- */
        .step-card {
            display: flex;
            gap: 1.25rem;
            align-items: flex-start;
            padding: 1.5rem;
            background: #fff;
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

        .step-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .step-number {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--brand-500);
            color: #fff;
            font-weight: 700;
            font-size: 1.2rem;
            border-radius: 50%;
        }

        .step-content {
            flex: 1;
        }

        .step-content h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 0.3rem;
        }

        .step-content p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }

        @media (max-width: 640px) {
            .step-card {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .step-number {
                margin-bottom: 0.5rem;
            }
        }

        /* ---- FAQ ---- */
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 1.25rem 0;
        }

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

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            padding: 0.25rem 0;
            user-select: none;
        }

        .faq-question:hover {
            color: var(--brand-600);
        }

        .faq-question .icon {
            font-size: 1.2rem;
            color: var(--text-muted);
            transition: var(--transition);
            flex-shrink: 0;
            margin-left: 1rem;
        }

        .faq-item.open .faq-question .icon {
            transform: rotate(45deg);
            color: var(--brand-500);
        }

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

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-top: 0.75rem;
        }

        /* ---- CTA ---- */
        .cta-section {
            background: linear-gradient(135deg, #1e3a8a 0%, #0f172a 100%);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.1;
            mix-blend-mode: overlay;
        }

        .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 4rem 1.25rem;
        }

        .cta-title {
            font-size: clamp(1.6rem, 3vw, 2.4rem);
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.75rem;
        }

        .cta-text {
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 2rem;
            font-size: 1.05rem;
            line-height: 1.7;
        }

        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 1rem 2.8rem;
            background: #fff;
            color: var(--brand-700);
            border: none;
            border-radius: 9999px;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
        }

        .cta-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
            background: #f8fafc;
        }

        /* ---- Footer ---- */
        .site-footer {
            background: #0f172a;
            color: rgba(255, 255, 255, 0.7);
            padding: 3.5rem 0 2rem;
        }

        .footer-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.75rem;
        }

        .footer-text {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 360px;
        }

        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            justify-content: center;
            margin-top: 1.5rem;
        }

        .footer-links a {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
        }

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

        .footer-divider {
            border: none;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin: 2rem 0 1.5rem;
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }

        @media (max-width: 640px) {
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .site-footer {
                padding: 2.5rem 0 1.5rem;
            }
        }

        /* ---- Post List Item ---- */
        .post-item {
            display: flex;
            gap: 1.25rem;
            padding: 1.25rem 0;
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }

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

        .post-item:hover {
            padding-left: 0.5rem;
        }

        .post-thumb {
            flex-shrink: 0;
            width: 100px;
            height: 72px;
            border-radius: 0.5rem;
            object-fit: cover;
            background: var(--bg-section-alt);
        }

        .post-info {
            flex: 1;
            min-width: 0;
        }

        .post-info h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 0.3rem;
            color: var(--text-primary);
            line-height: 1.4;
        }

        .post-info h4:hover {
            color: var(--brand-600);
        }

        .post-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
            align-items: center;
        }

        .post-meta .cat {
            color: var(--brand-500);
            font-weight: 500;
        }

        @media (max-width: 520px) {
            .post-item {
                flex-direction: column;
                gap: 0.75rem;
            }
            .post-thumb {
                width: 100%;
                height: 140px;
            }
        }

        /* ---- Empty State ---- */
        .empty-state {
            text-align: center;
            padding: 2.5rem 1.5rem;
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* ---- Category Grid ---- */
        .cat-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }

        @media (min-width: 640px) {
            .cat-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (min-width: 900px) {
            .cat-grid {
                grid-template-columns: 1fr 1fr 1fr;
            }
        }

        /* ---- Feature Grid ---- */
        .feature-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }

        @media (min-width: 640px) {
            .feature-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (min-width: 900px) {
            .feature-grid {
                grid-template-columns: 1fr 1fr 1fr 1fr;
            }
        }

        /* ---- Utility ---- */
        .text-balance {
            text-wrap: balance;
        }

        .gap-section {
            gap: 2.5rem;
        }

        @media (max-width: 640px) {
            .gap-section {
                gap: 1.5rem;
            }
        }

        /* ---- Animations ---- */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            animation: fadeUp 0.7s ease forwards;
        }

        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .fade-up-delay-1 {
            animation-delay: 0.1s;
        }
        .fade-up-delay-2 {
            animation-delay: 0.2s;
        }
        .fade-up-delay-3 {
            animation-delay: 0.3s;
        }
        .fade-up-delay-4 {
            animation-delay: 0.4s;
        }

        .img-cover-rounded {
            border-radius: var(--radius-xl);
            object-fit: cover;
            width: 100%;
            height: 100%;
        }

        /* ---- Responsive tweaks ---- */
        @media (max-width: 480px) {
            .container-custom {
                padding-left: 0.75rem;
                padding-right: 0.75rem;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .section-padding {
                padding: 2.5rem 0;
            }
            .card-body {
                padding: 1.25rem;
            }
            .stat-number {
                font-size: 2rem;
            }
        }

/* roulang page: category1 */
/* ===== :root 设计变量 ===== */
        :root {
            --brand-50: #f0f7ff;
            --brand-100: #e0effe;
            --brand-200: #b9dff8;
            --brand-300: #7cc5f0;
            --brand-400: #36a9e6;
            --brand-500: #1a8fd0;
            --brand-600: #0f72b5;
            --brand-700: #0e5a93;
            --brand-800: #114c7a;
            --brand-900: #134165;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.15);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset / Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', sans-serif;
            line-height: 1.7;
            color: var(--gray-800);
            background: #ffffff;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--gray-900);
        }

        /* ===== Container ===== */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        @media (max-width: 768px) {
            .container-custom {
                padding: 0 16px;
            }
        }

        /* ===== 导航 ===== */
        .site-header {
            background: rgba(255, 255, 255, 0.97);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--gray-200);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
        }
        .nav-search-wrap {
            position: relative;
            flex: 1;
            max-width: 400px;
        }
        .nav-search-input {
            width: 100%;
            padding: 10px 18px 10px 42px;
            border-radius: 999px;
            border: 1.5px solid var(--gray-200);
            background: var(--gray-50);
            font-size: 0.9rem;
            color: var(--gray-700);
            transition: border var(--transition), box-shadow var(--transition);
        }
        .nav-search-input:focus {
            border-color: var(--brand-400);
            box-shadow: 0 0 0 4px rgba(15, 114, 181, 0.1);
            background: #fff;
        }
        .nav-search-input::placeholder {
            color: var(--gray-400);
            font-size: 0.85rem;
        }
        .search-icon {
            position: absolute;
            left: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-400);
            font-size: 0.9rem;
            pointer-events: none;
        }
        .desktop-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-link {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--gray-600);
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .nav-link:hover {
            background: var(--brand-50);
            color: var(--brand-700);
        }
        .nav-link.active {
            background: var(--brand-100);
            color: var(--brand-800);
            font-weight: 600;
        }
        .mobile-menu-btn {
            display: none;
            font-size: 1.5rem;
            color: var(--gray-700);
            padding: 6px 8px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .mobile-menu-btn:hover {
            background: var(--gray-100);
        }
        .mobile-nav {
            display: none;
            padding: 12px 0 20px;
            border-top: 1px solid var(--gray-200);
        }
        .mobile-nav.open {
            display: block;
        }
        .mobile-nav .nav-link {
            display: block;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
        }
        .mobile-nav .nav-link.active {
            background: var(--brand-100);
        }

        @media (max-width: 768px) {
            .desktop-nav {
                display: none !important;
            }
            .mobile-menu-btn {
                display: block;
            }
            .nav-search-wrap {
                max-width: 100%;
                margin: 0 0 8px 0;
            }
            .nav-search-wrap.hidden {
                display: none;
            }
        }
        @media (min-width: 769px) {
            .mobile-nav {
                display: none !important;
            }
        }

        /* ===== Hero / Banner ===== */
        .hero-banner {
            position: relative;
            min-height: 340px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 60px 20px;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            isolation: isolate;
        }
        .hero-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 114, 181, 0.8) 0%, rgba(14, 90, 147, 0.6) 100%);
            z-index: 0;
        }
        .hero-banner>* {
            position: relative;
            z-index: 1;
        }
        .hero-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
            letter-spacing: -0.02em;
        }
        .hero-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.9);
            max-width: 640px;
            margin: 12px auto 0;
        }
        .hero-banner .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(4px);
            padding: 6px 20px;
            border-radius: 999px;
            color: #fff;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 16px;
            border: 1px solid rgba(255, 255, 255, 0.25);
        }
        @media (max-width: 768px) {
            .hero-banner {
                min-height: 260px;
                padding: 40px 16px;
            }
            .hero-banner h1 {
                font-size: 1.9rem;
            }
            .hero-banner p {
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .hero-banner h1 {
                font-size: 1.5rem;
            }
        }

        /* ===== 板块通用 ===== */
        .section-padding {
            padding: 72px 0;
        }
        .section-padding-sm {
            padding: 48px 0;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--gray-500);
            max-width: 680px;
            margin: 0 auto 40px;
        }
        .section-divider {
            width: 60px;
            height: 4px;
            background: var(--brand-500);
            border-radius: 4px;
            margin: 0 auto 16px;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 28px;
            }
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--gray-200);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 22px 24px 26px;
        }
        .card-body h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .card-body p {
            font-size: 0.92rem;
            color: var(--gray-500);
            line-height: 1.6;
        }
        .card-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 999px;
            background: var(--brand-50);
            color: var(--brand-700);
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .card .btn-outline-sm {
            margin-top: 14px;
        }
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 22px;
            }
        }
        @media (max-width: 640px) {
            .card-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .card-img {
                height: 180px;
            }
            .card-body {
                padding: 16px 18px 20px;
            }
        }

        /* ===== 步骤流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            background: #fff;
            border-radius: var(--radius);
            padding: 32px 24px 28px;
            text-align: center;
            box-shadow: var(--shadow);
            border: 1px solid var(--gray-100);
            transition: transform var(--transition), box-shadow var(--transition);
            position: relative;
        }
        .step-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--brand-100);
            color: var(--brand-700);
            font-size: 1.3rem;
            font-weight: 700;
            margin: 0 auto 16px;
            transition: background var(--transition), color var(--transition);
        }
        .step-item:hover::before {
            background: var(--brand-600);
            color: #fff;
        }
        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.88rem;
            color: var(--gray-500);
            line-height: 1.6;
        }
        @media (max-width: 900px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .step-item {
                padding: 24px 18px 22px;
            }
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--gray-200);
            border-radius: var(--radius-sm);
            background: #fff;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--gray-800);
            background: transparent;
            text-align: left;
            transition: background var(--transition);
            gap: 12px;
        }
        .faq-question:hover {
            background: var(--gray-50);
        }
        .faq-question i {
            font-size: 1.1rem;
            color: var(--brand-500);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.92rem;
            color: var(--gray-500);
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }
        @media (max-width: 640px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 0.88rem;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--brand-800) 0%, var(--brand-600) 100%);
            border-radius: var(--radius-lg);
            padding: 56px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 999px;
            background: #fff;
            color: var(--brand-700);
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .cta-section .btn-cta:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
        }
        .cta-section .btn-cta i {
            font-size: 1.1rem;
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 40px 24px;
                border-radius: var(--radius);
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .cta-section .btn-cta {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--gray-900);
            padding: 52px 0 28px;
            color: var(--gray-300);
        }
        .footer-brand {
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
            letter-spacing: -0.01em;
        }
        .footer-text {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 420px;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 18px;
            margin-top: 4px;
        }
        .footer-links a {
            font-size: 0.9rem;
            color: var(--gray-400);
            transition: color var(--transition);
        }
        .footer-links a:hover {
            color: var(--brand-300);
        }
        .footer-divider {
            border: none;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin: 28px 0 20px;
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 10px;
            font-size: 0.82rem;
            color: var(--gray-500);
        }
        @media (max-width: 768px) {
            .site-footer {
                padding: 36px 0 20px;
            }
            .footer-brand {
                font-size: 1.2rem;
            }
            .footer-text {
                max-width: 100%;
                font-size: 0.85rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 6px;
            }
            .footer-links {
                justify-content: center;
            }
        }

        /* ===== 工具类 ===== */
        .text-brand-600 {
            color: var(--brand-600);
        }
        .text-brand-700 {
            color: var(--brand-700);
        }
        .bg-brand-50 {
            background: var(--brand-50);
        }
        .bg-brand-100 {
            background: var(--brand-100);
        }
        .bg-brand-600 {
            background: var(--brand-600);
        }
        .bg-brand-700 {
            background: var(--brand-700);
        }
        .btn-outline-sm {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 999px;
            border: 1.5px solid var(--brand-300);
            color: var(--brand-700);
            font-size: 0.82rem;
            font-weight: 600;
            transition: background var(--transition), border-color var(--transition), color var(--transition);
        }
        .btn-outline-sm:hover {
            background: var(--brand-600);
            border-color: var(--brand-600);
            color: #fff;
        }
        .border-gray-200 {
            border-color: var(--gray-200);
        }
        .shadow-card {
            box-shadow: var(--shadow);
        }

        /* ===== 图片遮罩辅助 ===== */
        .img-mask-overlay {
            position: relative;
        }
        .img-mask-overlay::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.4) 0%, transparent 60%);
            pointer-events: none;
        }

        /* ===== 分类页特定样式 ===== */
        .category-hero {
            position: relative;
            min-height: 300px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 48px 20px;
            background-size: cover;
            background-position: center;
            isolation: isolate;
            border-radius: 0;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(14, 90, 147, 0.85) 0%, rgba(15, 114, 181, 0.65) 100%);
            z-index: 0;
        }
        .category-hero>* {
            position: relative;
            z-index: 1;
        }
        .category-hero h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: #fff;
            text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
        }
        .category-hero .breadcrumb {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 12px;
        }
        .category-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
        }
        .category-hero .breadcrumb a:hover {
            color: #fff;
        }
        .category-hero .breadcrumb span {
            color: rgba(255, 255, 255, 0.5);
        }
        @media (max-width: 768px) {
            .category-hero {
                min-height: 220px;
                padding: 32px 16px;
            }
            .category-hero h1 {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 1.4rem;
            }
        }

        /* 介绍区块 */
        .intro-block {
            display: flex;
            align-items: center;
            gap: 40px;
            background: var(--gray-50);
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            border: 1px solid var(--gray-200);
        }
        .intro-block .intro-icon {
            flex-shrink: 0;
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--brand-100);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            color: var(--brand-700);
        }
        .intro-block h2 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .intro-block p {
            font-size: 0.95rem;
            color: var(--gray-500);
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .intro-block {
                flex-direction: column;
                padding: 28px 22px;
                gap: 20px;
                text-align: center;
            }
            .intro-block .intro-icon {
                width: 64px;
                height: 64px;
                font-size: 1.6rem;
            }
            .intro-block h2 {
                font-size: 1.1rem;
            }
            .intro-block p {
                font-size: 0.9rem;
            }
        }

        /* 分类统计小标签 */
        .stat-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 16px;
            border-radius: 999px;
            background: var(--brand-50);
            color: var(--brand-700);
            font-size: 0.8rem;
            font-weight: 600;
        }
        .stat-badge i {
            font-size: 0.75rem;
        }

        /* banner 内部装饰 */
        .hero-decoration {
            position: absolute;
            right: 0;
            bottom: 0;
            width: 300px;
            height: 300px;
            opacity: 0.08;
            background: radial-gradient(circle at center, #fff, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --brand-50: #eff6ff;
            --brand-100: #dbeafe;
            --brand-200: #bfdbfe;
            --brand-300: #93c5fd;
            --brand-400: #60a5fa;
            --brand-500: #3b82f6;
            --brand-600: #2563eb;
            --brand-700: #1d4ed8;
            --brand-800: #1e40af;
            --brand-900: #1e3a8a;
            --accent-500: #f59e0b;
            --accent-600: #d97706;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
            --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
            --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);
            --radius-sm: 0.375rem;
            --radius: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.5rem;
            --radius-full: 9999px;
            --transition: 0.2s ease;
            --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }

        /* ===== Base Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        body {
            font-family: var(--font-sans);
            font-size: 1rem;
            line-height: 1.6;
            color: var(--gray-800);
            background: #ffffff;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--brand-600); }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--gray-900); }
        h1 { font-size: 2.25rem; }
        h2 { font-size: 1.75rem; }
        h3 { font-size: 1.25rem; }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 1rem; }
        p:last-child { margin-bottom: 0; }

        /* ===== Container ===== */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        @media (min-width: 768px) {
            .container-custom { padding: 0 2rem; }
        }
        @media (min-width: 1024px) {
            .container-custom { padding: 0 2.5rem; }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            background: rgba(255,255,255,0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--gray-200);
            position: sticky;
            top: 0;
            z-index: 50;
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .nav-search-wrap {
            position: relative;
            flex: 1;
            max-width: 400px;
        }
        .nav-search-input {
            width: 100%;
            padding: 0.6rem 1rem 0.6rem 2.5rem;
            border: 1px solid var(--gray-200);
            border-radius: var(--radius-full);
            background: var(--gray-50);
            font-size: 0.9rem;
            transition: all var(--transition);
            outline: none;
        }
        .nav-search-input:focus {
            border-color: var(--brand-400);
            background: #ffffff;
            box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
        }
        .search-icon {
            position: absolute;
            left: 0.9rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-400);
            font-size: 0.85rem;
            pointer-events: none;
        }
        .desktop-nav .nav-link {
            padding: 0.5rem 0.9rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--gray-600);
            border-radius: var(--radius-full);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .desktop-nav .nav-link:hover {
            color: var(--brand-700);
            background: var(--brand-50);
        }
        .desktop-nav .nav-link.active {
            color: var(--brand-700);
            background: var(--brand-50);
            font-weight: 600;
        }
        .mobile-menu-btn {
            display: none;
            padding: 0.5rem 0.75rem;
            border-radius: var(--radius);
            color: var(--gray-600);
            font-size: 1.25rem;
            transition: background var(--transition);
        }
        .mobile-menu-btn:hover {
            background: var(--gray-100);
        }
        .mobile-nav {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 0.5rem;
        }
        .mobile-nav.open {
            max-height: 500px;
            padding: 0.75rem 0.5rem 1.25rem;
        }
        .mobile-nav .nav-link {
            display: block;
            padding: 0.7rem 1rem;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--gray-700);
            border-radius: var(--radius);
            transition: all var(--transition);
        }
        .mobile-nav .nav-link:hover {
            background: var(--brand-50);
            color: var(--brand-700);
        }
        .mobile-nav .nav-link.active {
            color: var(--brand-700);
            background: var(--brand-50);
            font-weight: 600;
        }
        @media (max-width: 1023px) {
            .desktop-nav { display: none !important; }
            .mobile-menu-btn { display: flex; align-items: center; justify-content: center; }
            .nav-search-wrap { display: none !important; }
        }
        @media (min-width: 1024px) {
            .mobile-nav { display: none !important; }
        }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            min-height: 280px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 50%, #2563eb 100%);
            overflow: hidden;
            padding: 3.5rem 0;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.4) 100%);
        }
        .article-hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .article-hero-content h1 {
            font-size: 2rem;
            color: #ffffff;
            text-shadow: 0 2px 8px rgba(0,0,0,0.2);
            margin-bottom: 0.75rem;
            line-height: 1.3;
        }
        .article-hero-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.75rem 1.5rem;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.85);
        }
        .article-hero-meta span {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .article-hero-meta i {
            font-size: 0.8rem;
            opacity: 0.8;
        }
        .article-hero-category {
            display: inline-block;
            padding: 0.2rem 1rem;
            background: rgba(255,255,255,0.18);
            backdrop-filter: blur(4px);
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 500;
            color: #ffffff;
            letter-spacing: 0.3px;
        }
        @media (min-width: 768px) {
            .article-hero { min-height: 320px; padding: 4.5rem 0; }
            .article-hero-content h1 { font-size: 2.5rem; }
        }
        @media (min-width: 1024px) {
            .article-hero-content h1 { font-size: 2.75rem; }
        }

        /* ===== Article Main ===== */
        .article-main {
            padding: 2.5rem 0 3rem;
            background: var(--gray-50);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        .article-body {
            background: #ffffff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            padding: 1.75rem 1.5rem;
            overflow: hidden;
        }
        .article-body .content {
            font-size: 1rem;
            line-height: 1.85;
            color: var(--gray-700);
        }
        .article-body .content p {
            margin-bottom: 1.25rem;
        }
        .article-body .content h2,
        .article-body .content h3 {
            margin-top: 2rem;
            margin-bottom: 0.75rem;
            color: var(--gray-900);
        }
        .article-body .content h2 { font-size: 1.35rem; }
        .article-body .content h3 { font-size: 1.15rem; }
        .article-body .content ul,
        .article-body .content ol {
            margin: 0 0 1.25rem 1.5rem;
        }
        .article-body .content li {
            margin-bottom: 0.4rem;
            list-style: disc;
        }
        .article-body .content a {
            color: var(--brand-600);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body .content a:hover {
            color: var(--brand-800);
        }
        .article-body .content img {
            border-radius: var(--radius);
            margin: 1.5rem auto;
            max-width: 100%;
            height: auto;
            box-shadow: var(--shadow-md);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--brand-400);
            background: var(--brand-50);
            padding: 1rem 1.25rem;
            margin: 1.25rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--gray-600);
        }
        .article-body .content code {
            background: var(--gray-100);
            padding: 0.15rem 0.45rem;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--gray-800);
        }
        .article-body .content pre {
            background: var(--gray-900);
            color: #e5e7eb;
            padding: 1.25rem;
            border-radius: var(--radius);
            overflow-x: auto;
            margin: 1.25rem 0;
            font-size: 0.9rem;
        }
        .article-body .content pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }

        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .sidebar-card {
            background: #ffffff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            padding: 1.5rem;
        }
        .sidebar-card h3 {
            font-size: 1.05rem;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--gray-900);
        }
        .sidebar-card h3 i {
            color: var(--brand-500);
        }
        .sidebar-info-item {
            display: flex;
            justify-content: space-between;
            padding: 0.6rem 0;
            border-bottom: 1px solid var(--gray-100);
            font-size: 0.9rem;
        }
        .sidebar-info-item:last-child {
            border-bottom: none;
        }
        .sidebar-info-item .label {
            color: var(--gray-500);
            font-weight: 500;
        }
        .sidebar-info-item .value {
            color: var(--gray-800);
            font-weight: 500;
        }
        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .sidebar-tags .tag {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background: var(--brand-50);
            color: var(--brand-700);
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 500;
            transition: all var(--transition);
        }
        .sidebar-tags .tag:hover {
            background: var(--brand-100);
            transform: translateY(-1px);
        }

        @media (min-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr 320px;
                gap: 2.5rem;
            }
            .article-body { padding: 2.5rem; }
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 4rem 2rem;
            background: #ffffff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
        }
        .not-found-box .icon {
            font-size: 3.5rem;
            color: var(--gray-300);
            margin-bottom: 1.25rem;
        }
        .not-found-box h2 {
            font-size: 1.5rem;
            color: var(--gray-700);
            margin-bottom: 0.75rem;
        }
        .not-found-box p {
            color: var(--gray-500);
            margin-bottom: 1.5rem;
        }

        /* ===== Related Posts ===== */
        .related-section {
            padding: 3rem 0;
            background: #ffffff;
        }
        .related-section .section-title {
            text-align: center;
            margin-bottom: 2rem;
        }
        .related-section .section-title h2 {
            font-size: 1.5rem;
            color: var(--gray-900);
        }
        .related-section .section-title p {
            color: var(--gray-500);
            font-size: 0.95rem;
            margin-top: 0.4rem;
        }
        .related-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }
        .related-card {
            background: var(--gray-50);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--gray-100);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--brand-100);
        }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .related-card .card-body {
            padding: 1.25rem 1.25rem 1.5rem;
        }
        .related-card .card-body h3 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--gray-900);
            margin-bottom: 0.4rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body p {
            font-size: 0.85rem;
            color: var(--gray-500);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 0.75rem;
            font-size: 0.8rem;
            color: var(--gray-400);
        }
        @media (min-width: 640px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (min-width: 1024px) {
            .related-grid { grid-template-columns: repeat(3, 1fr); }
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 3rem 0;
            background: var(--gray-50);
        }
        .faq-section .section-title {
            text-align: center;
            margin-bottom: 2rem;
        }
        .faq-section .section-title h2 {
            font-size: 1.5rem;
            color: var(--gray-900);
        }
        .faq-section .section-title p {
            color: var(--gray-500);
            font-size: 0.95rem;
            margin-top: 0.4rem;
        }
        .faq-grid {
            display: grid;
            gap: 1rem;
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: #ffffff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--gray-200);
            padding: 1.25rem 1.5rem;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--brand-200);
            box-shadow: var(--shadow);
        }
        .faq-item .question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: var(--gray-800);
            cursor: pointer;
            font-size: 0.95rem;
            gap: 1rem;
        }
        .faq-item .question i {
            color: var(--brand-500);
            font-size: 0.85rem;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .question i {
            transform: rotate(180deg);
        }
        .faq-item .answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 0 0;
            color: var(--gray-600);
            font-size: 0.9rem;
            line-height: 1.7;
        }
        .faq-item.open .answer {
            max-height: 300px;
            padding: 0.75rem 0 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 3.5rem 0;
            background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
            color: #ffffff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container-custom {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 1.75rem;
            color: #ffffff;
            margin-bottom: 0.75rem;
        }
        .cta-section p {
            font-size: 1rem;
            color: rgba(255,255,255,0.85);
            max-width: 600px;
            margin: 0 auto 1.75rem;
        }
        .cta-section .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.85rem 2.25rem;
            background: #ffffff;
            color: var(--brand-700);
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius-full);
            transition: all var(--transition);
            box-shadow: var(--shadow-lg);
        }
        .cta-section .cta-btn:hover {
            background: var(--brand-50);
            transform: translateY(-2px);
            box-shadow: var(--shadow-xl);
        }
        .cta-section .cta-btn i {
            font-size: 0.9rem;
        }
        @media (min-width: 768px) {
            .cta-section h2 { font-size: 2rem; }
            .cta-section { padding: 4.5rem 0; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--gray-900);
            color: var(--gray-300);
            padding: 3rem 0 1.5rem;
        }
        .footer-brand {
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 0.75rem;
            color: #ffffff;
        }
        .footer-text {
            font-size: 0.85rem;
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem 1.25rem;
            font-size: 0.9rem;
        }
        .footer-links a {
            color: var(--gray-400);
            transition: color var(--transition);
            font-weight: 500;
        }
        .footer-links a:hover {
            color: #ffffff;
        }
        .footer-divider {
            border: none;
            border-top: 1px solid rgba(255,255,255,0.08);
            margin: 1.75rem 0 1.25rem;
        }
        .footer-bottom {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.25rem;
            font-size: 0.8rem;
            color: var(--gray-500);
            text-align: center;
        }
        @media (min-width: 768px) {
            .footer-bottom {
                flex-direction: row;
                justify-content: space-between;
                text-align: left;
            }
        }

        /* ===== Utility ===== */
        .text-brand-600 { color: var(--brand-600); }
        .text-brand-700 { color: var(--brand-700); }
        .text-brand-400 { color: var(--brand-400); }
        .bg-brand-50 { background: var(--brand-50); }
        .bg-brand-600 { background: var(--brand-600); }
        .bg-brand-700 { background: var(--brand-700); }
        .hover\:bg-brand-700:hover { background: var(--brand-700); }
        .focus\:border-brand-400:focus { border-color: var(--brand-400); }
        .focus\:ring-brand-100:focus { --tw-ring-color: var(--brand-100); }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 6px; height: 6px; }
        ::-webkit-scrollbar-track { background: var(--gray-100); }
        ::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 3px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }

        /* ===== Tailwind overrides ===== */
        @layer utilities {
            .tracking-tight { letter-spacing: -0.025em; }
        }

        /* ===== Print ===== */
        @media print {
            .site-header, .site-footer, .related-section, .faq-section, .cta-section,
            .mobile-menu-btn, .article-sidebar { display: none !important; }
            .article-main { padding: 0; background: #fff; }
            .article-body { box-shadow: none; padding: 0; }
            .article-hero { min-height: auto; padding: 2rem 0; }
            .article-hero-content h1 { font-size: 1.75rem; }
        }