/* roulang page: index */
:root {
            --color-primary: #1a365d;
            --color-primary-light: #264b7a;
            --color-primary-dark: #0f2240;
            --color-accent: #c9973a;
            --color-accent-light: #d4a843;
            --color-accent-dark: #a67c2e;
            --color-surface: #f7f8fa;
            --color-surface-alt: #edf0f5;
            --color-text-main: #1e293b;
            --color-text-soft: #64748b;
            --color-text-muted: #94a3b8;
            --color-border-soft: #e2e8f0;
            --radius-card: 0.75rem;
            --radius-btn: 0.5rem;
            --radius-tag: 2rem;
            --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.06), 0 4px 16px 0 rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 2px 8px 0 rgba(0, 0, 0, 0.10), 0 8px 28px 0 rgba(0, 0, 0, 0.06);
            --shadow-nav: 0 1px 0 0 rgba(0, 0, 0, 0.06), 0 2px 12px 0 rgba(0, 0, 0, 0.04);
            --shadow-btn: 0 2px 6px 0 rgba(0, 0, 0, 0.08);
            --shadow-btn-hover: 0 4px 14px 0 rgba(0, 0, 0, 0.14);
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
        }

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

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

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--color-text-main);
            background-color: #ffffff;
            min-height: 100vh;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }
        a:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
            border-radius: 2px;
        }

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
        }
        button:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
            border-radius: 4px;
        }

        input {
            font-family: inherit;
            font-size: inherit;
        }
        input:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }
        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: #ffffff;
            box-shadow: var(--shadow-nav);
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.10);
        }

        .header-top-bar {
            background: var(--color-primary-dark);
            color: #ffffff;
            font-size: 0.8rem;
            padding: 0.35rem 0;
            letter-spacing: 0.02em;
        }
        .header-top-bar a {
            color: #cbd5e1;
            transition: color 0.2s;
        }
        .header-top-bar a:hover {
            color: #ffffff;
        }

        .header-main {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 0.7rem;
            padding-bottom: 0.7rem;
            gap: 1.5rem;
            flex-wrap: wrap;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            font-size: 1.55rem;
            color: var(--color-primary);
            letter-spacing: -0.01em;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .logo-link .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--color-primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            font-weight: 800;
            flex-shrink: 0;
        }

        .header-search-wrap {
            flex: 1 1 260px;
            max-width: 380px;
            position: relative;
            min-width: 180px;
        }
        .header-search-wrap input {
            width: 100%;
            padding: 0.55rem 1rem 0.55rem 2.6rem;
            border: 1.5px solid var(--color-border-soft);
            border-radius: 2rem;
            font-size: 0.9rem;
            background: var(--color-surface);
            transition: all 0.25s;
            color: var(--color-text-main);
        }
        .header-search-wrap input:focus {
            border-color: var(--color-accent);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(201, 151, 58, 0.08);
            outline: none;
        }
        .header-search-wrap .search-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--color-text-muted);
            pointer-events: none;
            font-size: 0.9rem;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            flex-shrink: 0;
        }
        .btn-app-download {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.45rem 1rem;
            font-size: 0.82rem;
            font-weight: 500;
            border-radius: 2rem;
            background: var(--color-accent);
            color: #fff;
            transition: all 0.25s;
            white-space: nowrap;
            box-shadow: var(--shadow-btn);
        }
        .btn-app-download:hover {
            background: var(--color-accent-dark);
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-1px);
        }

        .main-nav {
            border-top: 1px solid var(--color-border-soft);
            background: #fff;
        }
        .main-nav .nav-list {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
            gap: 0;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }
        .main-nav .nav-list::-webkit-scrollbar {
            display: none;
        }
        .main-nav .nav-list li a {
            display: block;
            padding: 0.75rem 1.15rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-soft);
            border-bottom: 2.5px solid transparent;
            transition: all 0.2s;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .main-nav .nav-list li a:hover {
            color: var(--color-primary);
            border-bottom-color: var(--color-accent-light);
        }
        .main-nav .nav-list li a.nav-active {
            color: var(--color-primary);
            border-bottom-color: var(--color-accent);
            font-weight: 600;
        }

        /* Mobile nav toggle */
        .mobile-nav-toggle {
            display: none;
            width: 38px;
            height: 38px;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            background: var(--color-surface);
            font-size: 1.3rem;
            color: var(--color-primary);
            flex-shrink: 0;
        }
        @media (max-width: 768px) {
            .mobile-nav-toggle {
                display: flex;
            }
            .header-search-wrap {
                display: none;
            }
            .main-nav {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #fff;
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
                border-top: 1px solid var(--color-border-soft);
                z-index: 49;
            }
            .main-nav.open {
                display: block;
            }
            .main-nav .nav-list {
                flex-direction: column;
                padding: 0.5rem 0;
            }
            .main-nav .nav-list li a {
                padding: 0.8rem 1.5rem;
                border-bottom: none;
                border-left: 3px solid transparent;
                font-size: 0.95rem;
            }
            .main-nav .nav-list li a.nav-active {
                border-left-color: var(--color-accent);
                background: var(--color-surface);
            }
            .header-actions .btn-app-download {
                font-size: 0.75rem;
                padding: 0.4rem 0.8rem;
            }
        }

        /* Section spacing */
        .section {
            padding: 3.5rem 0;
        }
        @media (min-width: 768px) {
            .section {
                padding: 5rem 0;
            }
        }
        .section-sm {
            padding: 2.5rem 0;
        }
        @media (min-width: 768px) {
            .section-sm {
                padding: 3.5rem 0;
            }
        }

        .section-title {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 0.5rem;
            letter-spacing: -0.01em;
        }
        @media (min-width: 768px) {
            .section-title {
                font-size: 1.9rem;
            }
        }
        .section-subtitle {
            font-size: 0.95rem;
            color: var(--color-text-soft);
            margin-bottom: 2rem;
            max-width: 600px;
            line-height: 1.6;
        }
        @media (min-width: 768px) {
            .section-subtitle {
                font-size: 1rem;
                margin-bottom: 2.5rem;
            }
        }
        .section-header {
            text-align: center;
            margin-bottom: 2rem;
        }
        @media (min-width: 768px) {
            .section-header {
                margin-bottom: 3rem;
            }
        }
        .section-header .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* Cards */
        .card {
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
            overflow: hidden;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 1.25rem 1.25rem 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-title {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 0.5rem;
            line-height: 1.4;
        }
        .card-excerpt {
            font-size: 0.88rem;
            color: var(--color-text-soft);
            margin-bottom: 1rem;
            line-height: 1.55;
            flex: 1;
        }
        .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            padding: 0.25rem 0.7rem;
            border-radius: var(--radius-tag);
            background: #f1f5f9;
            color: var(--color-text-soft);
            font-weight: 500;
            letter-spacing: 0.02em;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.4rem;
            padding: 0.6rem 1.4rem;
            font-size: 0.9rem;
            font-weight: 600;
            border-radius: var(--radius-btn);
            transition: all 0.25s;
            letter-spacing: 0.01em;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--color-accent);
            color: #fff;
            box-shadow: var(--shadow-btn);
        }
        .btn-primary:hover {
            background: var(--color-accent-dark);
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-1px);
        }
        .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border: 1.5px solid var(--color-primary);
        }
        .btn-outline:hover {
            background: var(--color-primary);
            color: #fff;
        }
        .btn-sm {
            padding: 0.4rem 0.9rem;
            font-size: 0.8rem;
            border-radius: 6px;
        }
        .btn-lg {
            padding: 0.8rem 2rem;
            font-size: 1rem;
            border-radius: 10px;
        }

        /* Hero */
        .hero-section {
            position: relative;
            background: linear-gradient(135deg, #0f2240 0%, #1a365d 40%, #1e3a5f 100%);
            color: #fff;
            padding: 4rem 0;
            overflow: hidden;
            min-height: 420px;
            display: flex;
            align-items: center;
        }
        @media (min-width: 768px) {
            .hero-section {
                padding: 6rem 0;
                min-height: 500px;
            }
        }
        .hero-section .hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
            opacity: 0.18;
            background-image: url('assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .hero-section .hero-overlay {
            position: absolute;
            inset: 0;
            z-index: 1;
            background: radial-gradient(ellipse at 60% 30%, rgba(201, 151, 58, 0.12) 0%, transparent 60%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 720px;
        }
        .hero-content h1 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 1rem;
            line-height: 1.25;
        }
        @media (min-width: 768px) {
            .hero-content h1 {
                font-size: 2.8rem;
            }
        }
        @media (min-width: 1024px) {
            .hero-content h1 {
                font-size: 3.2rem;
            }
        }
        .hero-content .hero-desc {
            font-size: 1rem;
            color: #cbd5e1;
            line-height: 1.7;
            margin-bottom: 1.75rem;
            max-width: 620px;
        }
        @media (min-width: 768px) {
            .hero-content .hero-desc {
                font-size: 1.1rem;
            }
        }
        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
        }
        .hero-stats-row {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
        }
        .hero-stat-item {
            display: flex;
            flex-direction: column;
        }
        .hero-stat-item .stat-num {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--color-accent-light);
            letter-spacing: -0.01em;
        }
        .hero-stat-item .stat-label {
            font-size: 0.78rem;
            color: #94a3b8;
            margin-top: 0.15rem;
        }

        /* Data stats section */
        .stats-section {
            background: var(--color-primary-dark);
            color: #fff;
            padding: 3rem 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        @media (min-width: 640px) {
            .stats-grid {
                grid-template-columns: repeat(4, 1fr);
                gap: 2rem;
            }
        }
        .stat-card {
            text-align: center;
            padding: 1.5rem 1rem;
            background: rgba(255, 255, 255, 0.05);
            border-radius: var(--radius-card);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .stat-card .stat-icon {
            font-size: 2rem;
            margin-bottom: 0.5rem;
        }
        .stat-card .stat-value {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--color-accent-light);
            letter-spacing: -0.02em;
        }
        @media (min-width: 768px) {
            .stat-card .stat-value {
                font-size: 2.6rem;
            }
        }
        .stat-card .stat-name {
            font-size: 0.85rem;
            color: #94a3b8;
            margin-top: 0.3rem;
        }

        /* FAQ */
        .faq-item {
            border: 1px solid var(--color-border-soft);
            border-radius: var(--radius-card);
            margin-bottom: 0.75rem;
            overflow: hidden;
            background: #fff;
            transition: box-shadow 0.25s;
        }
        .faq-item:hover {
            box-shadow: var(--shadow-card);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 1.1rem 1.25rem;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-primary);
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            background: #fff;
            transition: background 0.2s;
            cursor: pointer;
        }
        .faq-question:hover {
            background: var(--color-surface);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--color-surface);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            transition: all 0.3s;
            color: var(--color-text-soft);
        }
        .faq-item.open .faq-question .faq-icon {
            background: var(--color-accent);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 1.25rem;
            font-size: 0.88rem;
            color: var(--color-text-soft);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 1.25rem 1.25rem;
        }

        /* Testimonial */
        .testimonial-card {
            background: #fff;
            border-radius: var(--radius-card);
            padding: 1.5rem;
            box-shadow: var(--shadow-card);
            position: relative;
            border-left: 4px solid var(--color-accent);
        }
        .testimonial-card .quote-mark {
            font-size: 3rem;
            color: var(--color-accent-light);
            opacity: 0.3;
            line-height: 1;
            margin-bottom: 0.5rem;
        }
        .testimonial-card .quote-text {
            font-size: 0.9rem;
            color: var(--color-text-soft);
            line-height: 1.7;
            margin-bottom: 1rem;
        }
        .testimonial-card .quote-author {
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--color-primary);
        }

        /* Partner logos */
        .partner-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 1.5rem 2.5rem;
        }
        .partner-item {
            padding: 0.75rem 1.25rem;
            background: #fff;
            border-radius: 10px;
            font-weight: 600;
            color: var(--color-text-soft);
            font-size: 0.9rem;
            letter-spacing: 0.02em;
            box-shadow: var(--shadow-card);
            transition: all 0.25s;
            text-align: center;
            min-width: 90px;
        }
        .partner-item:hover {
            color: var(--color-primary);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        /* News card */
        .news-card {
            display: flex;
            gap: 1rem;
            padding: 1rem;
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: all 0.3s;
            align-items: flex-start;
        }
        .news-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-1px);
        }
        .news-card .news-img {
            width: 100px;
            height: 70px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
        }
        @media (min-width: 480px) {
            .news-card .news-img {
                width: 140px;
                height: 90px;
            }
        }
        .news-card .news-info {
            flex: 1;
            min-width: 0;
        }
        .news-card .news-date {
            font-size: 0.75rem;
            color: var(--color-text-muted);
            margin-bottom: 0.3rem;
        }
        .news-card .news-title {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 0.35rem;
            line-height: 1.4;
        }
        .news-card .news-summary {
            font-size: 0.8rem;
            color: var(--color-text-soft);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* Footer */
        .site-footer {
            background: var(--color-primary-dark);
            color: #cbd5e1;
            padding: 3rem 0 2rem;
            font-size: 0.88rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        @media (min-width: 640px) {
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr 1fr;
            }
        }
        .footer-brand {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.75rem;
        }
        .footer-desc {
            color: #94a3b8;
            line-height: 1.6;
            margin-bottom: 1rem;
        }
        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 0.75rem;
            letter-spacing: 0.02em;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 0.4rem;
        }
        .footer-col ul li a {
            color: #94a3b8;
            font-size: 0.82rem;
            transition: color 0.2s;
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.78rem;
            color: #64748b;
        }

        /* CTA section */
        .cta-section {
            background: linear-gradient(135deg, #1a365d 0%, #264b7a 100%);
            color: #fff;
            text-align: center;
            padding: 3.5rem 0;
            border-radius: 0;
        }
        .cta-section h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
        }
        @media (min-width: 768px) {
            .cta-section h2 {
                font-size: 1.8rem;
            }
        }
        .cta-section p {
            color: #cbd5e1;
            margin-bottom: 1.5rem;
            font-size: 0.95rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Utility */
        .text-accent {
            color: var(--color-accent);
        }
        .bg-surface {
            background: var(--color-surface);
        }
        .bg-surface-alt {
            background: var(--color-surface-alt);
        }
        .divider {
            width: 60px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
            margin: 0.5rem auto 1.5rem;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border-width: 0;
        }

/* roulang page: category3 */
:root {
            --primary: #1e40af;
            --primary-light: #3b82f6;
            --secondary: #f59e0b;
            --bg: #f8fafc;
            --text: #0f172a;
            --text-light: #64748b;
            --border: #e2e8f0;
            --radius: 0.5rem;
            --shadow: 0 1px 3px rgba(0,0,0,0.08);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
        }
        * {
            box-sizing: border-box;
        }
        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: var(--text);
            background: #f1f5f9;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input {
            font-family: inherit;
        }
        .container {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }
        /* 顶部快捷栏 */
        .top-bar a {
            color: #cbd5e1;
            transition: color 0.2s;
            margin-left: 1.5rem;
        }
        .top-bar a:hover {
            color: white;
        }
        /* 导航 */
        .main-nav {
            background: white;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .nav-list {
            display: flex;
            gap: 2rem;
            list-style: none;
            padding: 0;
            margin: 0;
            align-items: center;
            overflow-x: auto;
            white-space: nowrap;
        }
        .nav-list a {
            display: inline-block;
            padding: 1.1rem 0;
            font-weight: 500;
            color: var(--text-light);
            border-bottom: 2px solid transparent;
            transition: all 0.2s;
            font-size: 0.95rem;
            letter-spacing: 0.01em;
        }
        .nav-list a:hover {
            color: var(--primary);
        }
        .nav-list a.nav-active {
            color: var(--primary);
            font-weight: 700;
            border-bottom-color: var(--primary);
        }
        /* 移动端菜单 */
        .mobile-menu-btn {
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            display: none;
        }
        .mobile-menu {
            display: none;
            flex-direction: column;
            background: white;
            border-top: 1px solid var(--border);
            padding: 0.5rem 1rem;
        }
        .mobile-menu a {
            padding: 0.75rem 0;
            border-bottom: 1px solid #f1f5f9;
            color: var(--text-light);
            font-weight: 500;
        }
        .mobile-menu a.nav-active {
            color: var(--primary);
            font-weight: 700;
        }
        @media (max-width: 768px) {
            .nav-list {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
            .mobile-menu.show {
                display: flex;
            }
            .top-bar .hidden-mobile {
                display: none;
            }
        }
        /* 卡片与板块 */
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.5rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }
        .card {
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: box-shadow 0.25s, transform 0.25s;
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .btn {
            display: inline-block;
            padding: 0.6rem 1.5rem;
            border-radius: 2rem;
            font-weight: 600;
            text-align: center;
            transition: all 0.2s;
            cursor: pointer;
            border: none;
            background: var(--primary);
            color: white;
        }
        .btn:hover {
            background: #1e3a8a;
            box-shadow: var(--shadow-md);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: white;
        }
        .tag {
            display: inline-block;
            background: #dbeafe;
            color: #1e40af;
            padding: 0.2rem 0.75rem;
            border-radius: 1rem;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.03em;
        }
        .hero-bg {
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .hero-bg::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(0,0,0,0.55);
        }
        /* 页脚 */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-brand {
            font-size: 1.5rem;
            font-weight: 700;
            color: white;
            margin-bottom: 0.5rem;
        }
        .footer-desc {
            font-size: 0.9rem;
            line-height: 1.6;
            color: #94a3b8;
        }
        .footer-col h4 {
            color: white;
            font-weight: 600;
            margin-bottom: 1rem;
            font-size: 0.95rem;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col li {
            margin-bottom: 0.5rem;
        }
        .footer-col a {
            color: #94a3b8;
            font-size: 0.9rem;
            transition: color 0.2s;
        }
        .footer-col a:hover {
            color: white;
        }
        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.8rem;
            color: #64748b;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        /* 统计数字 */
        .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border);
            padding: 1rem 0;
        }
        .faq-question {
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-answer {
            margin-top: 0.5rem;
            color: var(--text-light);
            display: none;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

/* roulang page: category1 */
:root {
            --color-primary: #1a56db;
            --color-primary-dark: #1e40af;
            --color-accent: #d97706;
            --color-accent-light: #f59e0b;
            --color-bg: #f8fafc;
            --color-surface: #ffffff;
            --color-text: #1e293b;
            --color-text-muted: #64748b;
            --color-text-light: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.07);
            --shadow-lg: 0 12px 30px rgba(15, 23, 42, 0.10);
            --transition-fast: 0.18s ease;
            --transition-normal: 0.28s ease;
        }

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

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

        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            line-height: 1.65;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input,
        select,
        textarea {
            font-family: inherit;
        }

        /* 导航样式 */
        .site-header {
            background: #ffffff;
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-normal);
        }

        .site-header.scrolled {
            box-shadow: 0 2px 12px rgba(15, 23, 42, 0.10);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.7rem 0;
            gap: 1.5rem;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            font-size: 1.35rem;
            color: var(--color-primary);
            letter-spacing: -0.01em;
            white-space: nowrap;
            flex-shrink: 0;
            transition: opacity var(--transition-fast);
        }
        .logo-link:hover {
            opacity: 0.85;
        }
        .logo-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, #1a56db, #1e40af);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            font-weight: 800;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-list {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
            gap: 0.2rem;
            align-items: center;
        }
        .nav-list li a {
            display: block;
            padding: 0.5rem 1rem;
            border-radius: 0.5rem;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--color-text-muted);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
            letter-spacing: 0.01em;
        }
        .nav-list li a:hover {
            color: var(--color-primary);
            background: #eff6ff;
        }
        .nav-list li a.nav-active {
            color: #ffffff;
            background: var(--color-primary);
            font-weight: 600;
            box-shadow: 0 2px 6px rgba(26, 86, 219, 0.30);
        }
        .nav-list li a.nav-active:hover {
            background: var(--color-primary-dark);
            color: #ffffff;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            flex-shrink: 0;
        }
        .btn-nav-app {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.45rem 1rem;
            border-radius: 0.5rem;
            font-size: 0.85rem;
            font-weight: 500;
            background: #f1f5f9;
            color: var(--color-text);
            border: 1px solid var(--color-border);
            transition: all var(--transition-fast);
            white-space: nowrap;
            cursor: pointer;
        }
        .btn-nav-app:hover {
            background: #e2e8f0;
            border-color: #cbd5e1;
        }

        /* 移动端菜单按钮 */
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            padding: 0.4rem;
            cursor: pointer;
            color: var(--color-text);
            font-size: 1.4rem;
            line-height: 1;
            border-radius: 0.4rem;
            transition: background var(--transition-fast);
        }
        .mobile-menu-toggle:hover {
            background: #f1f5f9;
        }

        /* 移动端导航面板 */
        .mobile-nav-panel {
            display: none;
            position: fixed;
            top: 0;
            right: 0;
            width: 280px;
            max-width: 85vw;
            height: 100vh;
            background: #ffffff;
            z-index: 200;
            box-shadow: -4px 0 24px rgba(15, 23, 42, 0.15);
            padding: 1.5rem;
            flex-direction: column;
            gap: 0.8rem;
            transform: translateX(100%);
            transition: transform 0.3s ease;
        }
        .mobile-nav-panel.open {
            transform: translateX(0);
        }
        .mobile-nav-panel .mobile-nav-close {
            align-self: flex-end;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--color-text);
            padding: 0.3rem 0.5rem;
            border-radius: 0.4rem;
        }
        .mobile-nav-panel a {
            display: block;
            padding: 0.7rem 1rem;
            border-radius: 0.5rem;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--color-text-muted);
            transition: all var(--transition-fast);
        }
        .mobile-nav-panel a:hover,
        .mobile-nav-panel a.nav-active {
            background: #eff6ff;
            color: var(--color-primary);
            font-weight: 600;
        }
        .mobile-nav-panel a.nav-active {
            background: var(--color-primary);
            color: #fff;
        }
        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.4);
            z-index: 150;
            transition: opacity 0.3s ease;
        }
        .mobile-overlay.show {
            display: block;
        }

        /* 板块间距 */
        .section-padding {
            padding: 3.5rem 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 2.2rem 0;
            }
        }

        /* 卡片hover */
        .card-hover {
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
        }
        .card-hover:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: #cbd5e1;
        }

        /* 推荐标签 */
        .tag-recommend {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.7rem;
            border-radius: 9999px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        .tag-hot {
            background: #fef2f2;
            color: #dc2626;
        }
        .tag-new {
            background: #f0fdf4;
            color: #16a34a;
        }
        .tag-top {
            background: #fffbeb;
            color: #d97706;
        }

        /* 进度条 */
        .confidence-bar {
            height: 6px;
            border-radius: 9999px;
            background: #e2e8f0;
            overflow: hidden;
        }
        .confidence-fill {
            height: 100%;
            border-radius: 9999px;
            background: linear-gradient(90deg, #1a56db, #3b82f6);
            transition: width 0.6s ease;
        }

        /* 页脚 */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 3rem 0 1.5rem;
            margin-top: 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 2rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid #1e293b;
        }
        .footer-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 0.6rem;
        }
        .footer-desc {
            font-size: 0.875rem;
            line-height: 1.7;
            color: #94a3b8;
            margin-bottom: 0.8rem;
        }
        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: #e2e8f0;
            margin-bottom: 0.8rem;
            letter-spacing: 0.02em;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 0.45rem;
        }
        .footer-col ul li a {
            color: #94a3b8;
            font-size: 0.85rem;
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            text-align: center;
            padding-top: 1.2rem;
            font-size: 0.8rem;
            color: #64748b;
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1.5rem;
            }
            .header-inner {
                gap: 0.8rem;
            }
            .nav-list li a {
                padding: 0.45rem 0.7rem;
                font-size: 0.85rem;
            }
            .btn-nav-app span.label {
                display: none;
            }
        }
        @media (max-width: 768px) {
            .main-nav {
                display: none;
            }
            .nav-actions .btn-nav-app {
                display: none;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .mobile-nav-panel {
                display: flex;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.2rem;
            }
            .section-padding {
                padding: 1.8rem 0;
            }
        }
        @media (max-width: 520px) {
            .logo-link {
                font-size: 1.15rem;
            }
            .logo-icon {
                width: 28px;
                height: 28px;
                font-size: 0.9rem;
            }
            .header-inner {
                padding: 0.5rem 0;
            }
        }

        /* 焦点闪烁动画 */
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.55;
                transform: scale(1.8);
            }
        }
        .live-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #dc2626;
            animation: pulse-dot 1.6s ease-in-out infinite;
            margin-right: 0.35rem;
            vertical-align: middle;
        }

        /* 自定义滚动条 */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: #f1f5f9;
        }
        ::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #94a3b8;
        }

        /* focus可访问性 */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid #3b82f6;
            outline-offset: 2px;
            border-radius: 4px;
        }

/* roulang page: category2 */
:root {
            --primary: #0f2b4b;
            --primary-light: #1a3d63;
            --primary-dark: #091c33;
            --accent: #c8944a;
            --accent-light: #d4a85c;
            --accent-dark: #a87a35;
            --bg-white: #ffffff;
            --bg-light: #f7f8fa;
            --bg-cream: #fdfaf5;
            --bg-sand: #faf6ef;
            --text-primary: #1a1a2e;
            --text-secondary: #4a5568;
            --text-muted: #8896a7;
            --text-light: #a0aec0;
            --border-color: #e2e8f0;
            --border-light: #edf2f7;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.10);
            --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition-fast: 0.2s ease;
            --transition-normal: 0.3s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
        }

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

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-white);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input {
            font-family: inherit;
        }

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

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

        /* ========== Header & Navigation ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-normal);
        }

        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            gap: 24px;
        }

        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            white-space: nowrap;
            letter-spacing: -0.02em;
            transition: color var(--transition-fast);
        }

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

        .header-logo .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        .main-nav {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .nav-list {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
            gap: 4px;
            align-items: center;
        }

        .nav-list li a {
            display: block;
            padding: 8px 18px;
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .nav-list li a:hover {
            color: var(--primary);
            background: var(--bg-light);
        }

        .nav-list li a.nav-active {
            color: var(--accent-dark);
            background: var(--bg-sand);
            font-weight: 600;
        }

        .nav-list li a.nav-active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 2px;
        }

        .header-search {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }

        .search-input-wrap {
            position: relative;
            display: flex;
            align-items: center;
        }

        .search-input-wrap input {
            width: 200px;
            padding: 9px 36px 9px 14px;
            border: 1px solid var(--border-color);
            border-radius: 24px;
            font-size: 0.875rem;
            color: var(--text-primary);
            background: var(--bg-light);
            outline: none;
            transition: all var(--transition-fast);
        }

        .search-input-wrap input:focus {
            border-color: var(--accent);
            background: var(--bg-white);
            box-shadow: 0 0 0 3px rgba(200, 148, 74, 0.1);
            width: 240px;
        }

        .search-input-wrap .search-icon {
            position: absolute;
            right: 12px;
            color: var(--text-muted);
            font-size: 0.9rem;
            pointer-events: none;
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            padding: 6px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }

        .mobile-menu-btn:hover {
            background: var(--bg-light);
        }

        @media (max-width: 1024px) {
            .header-search {
                display: none;
            }
            .main-nav {
                justify-content: flex-end;
            }
            .nav-list {
                gap: 0;
            }
            .nav-list li a {
                padding: 8px 12px;
                font-size: 0.85rem;
            }
        }

        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
            .main-nav {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: var(--bg-white);
                border-bottom: 2px solid var(--border-color);
                box-shadow: var(--shadow-lg);
                padding: 12px 0;
                display: none;
                z-index: 999;
            }
            .main-nav.open {
                display: block;
            }
            .nav-list {
                flex-direction: column;
                gap: 2px;
                padding: 0 16px;
            }
            .nav-list li a {
                padding: 11px 16px;
                font-size: 0.95rem;
                border-radius: var(--radius-sm);
            }
            .header-inner {
                padding: 10px 0;
            }
        }

        @media (max-width: 520px) {
            .header-logo {
                font-size: 1.25rem;
            }
            .header-logo .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 0.9rem;
            }
        }

        /* ========== 板块间距 ========== */
        .section {
            padding: 64px 0;
        }
        .section-sm {
            padding: 40px 0;
        }
        .section-lg {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section {
                padding: 40px 0;
            }
            .section-lg {
                padding: 52px 0;
            }
            .section-sm {
                padding: 28px 0;
            }
        }

        /* ========== Banner ========== */
        .page-banner {
            position: relative;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 40%, var(--primary-light) 100%);
            padding: 80px 0 70px;
            overflow: hidden;
            color: #fff;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            z-index: 0;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: linear-gradient(to top, rgba(255, 255, 255, 0.06), transparent);
            z-index: 0;
        }
        .page-banner .banner-content {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .page-banner .banner-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 16px;
            backdrop-filter: blur(6px);
        }
        .page-banner h1 {
            font-size: 2.6rem;
            font-weight: 700;
            margin: 0 0 14px;
            letter-spacing: -0.03em;
            line-height: 1.2;
        }
        .page-banner .banner-subtitle {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 620px;
            margin: 0 auto 24px;
            line-height: 1.6;
        }
        .page-banner .banner-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin-top: 8px;
        }
        .page-banner .banner-stat {
            text-align: center;
        }
        .page-banner .banner-stat .stat-num {
            font-size: 2rem;
            font-weight: 700;
            color: var(--accent-light);
            letter-spacing: -0.02em;
        }
        .page-banner .banner-stat .stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 2px;
        }
        @media (max-width: 768px) {
            .page-banner {
                padding: 52px 0 44px;
            }
            .page-banner h1 {
                font-size: 1.9rem;
            }
            .page-banner .banner-subtitle {
                font-size: 0.95rem;
            }
            .page-banner .banner-stats {
                gap: 20px;
            }
            .page-banner .banner-stat .stat-num {
                font-size: 1.5rem;
            }
        }

        /* ========== 卡片通用 ========== */
        .card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-color);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 20px;
        }
        .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 12px;
            background: var(--bg-sand);
            color: var(--accent-dark);
            margin-bottom: 8px;
        }
        .card-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 8px;
            line-height: 1.4;
        }
        .card-desc {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.5;
        }

        /* ========== 按钮 ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 11px 24px;
            border-radius: 24px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            transition: all var(--transition-fast);
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            box-shadow: 0 6px 20px rgba(168, 122, 53, 0.3);
            transform: translateY(-1px);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--accent);
            color: var(--accent-dark);
        }
        .btn-outline:hover {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 6px 20px rgba(168, 122, 53, 0.2);
            transform: translateY(-1px);
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
        }
        .btn-white:hover {
            background: #f0f0f0;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
            transform: translateY(-1px);
        }
        .btn-lg {
            padding: 14px 32px;
            font-size: 1.05rem;
            border-radius: 28px;
        }

        /* ========== 步骤条 ========== */
        .steps-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            counter-reset: step;
        }
        .step-item {
            display: flex;
            gap: 20px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-light);
            counter-increment: step;
            align-items: flex-start;
        }
        .step-item:last-child {
            border-bottom: none;
        }
        .step-num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .step-content h4 {
            margin: 0 0 4px;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-primary);
        }
        .step-content p {
            margin: 0;
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ========== 知识卡片网格 ========== */
        .knowledge-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        @media (max-width: 900px) {
            .knowledge-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 560px) {
            .knowledge-grid {
                grid-template-columns: 1fr;
            }
        }
        .knowledge-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            border: 1px solid var(--border-light);
            transition: all var(--transition-normal);
            text-align: center;
            box-shadow: var(--shadow-sm);
        }
        .knowledge-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--accent-light);
        }
        .knowledge-card .kc-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            font-size: 1.5rem;
            background: var(--bg-sand);
            color: var(--accent-dark);
        }
        .knowledge-card h4 {
            margin: 0 0 6px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
        }
        .knowledge-card p {
            margin: 0;
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ========== 教程列表 ========== */
        .tutorial-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        @media (max-width: 768px) {
            .tutorial-list {
                grid-template-columns: 1fr;
            }
        }
        .tutorial-item {
            display: flex;
            gap: 16px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            padding: 16px;
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-sm);
            align-items: center;
        }
        .tutorial-item:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-color: var(--border-color);
        }
        .tutorial-item .tutorial-thumb {
            width: 100px;
            height: 70px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .tutorial-info h4 {
            margin: 0 0 4px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.3;
        }
        .tutorial-info p {
            margin: 0;
            font-size: 0.8rem;
            color: var(--text-muted);
            line-height: 1.4;
        }
        .tutorial-info .tutorial-meta {
            display: flex;
            gap: 12px;
            font-size: 0.75rem;
            color: var(--text-light);
            margin-top: 4px;
        }

        /* ========== FAQ ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition-fast);
            box-shadow: var(--shadow-sm);
        }
        .faq-item:hover {
            border-color: var(--border-color);
            box-shadow: var(--shadow-md);
        }
        .faq-q {
            width: 100%;
            background: none;
            border: none;
            padding: 18px 20px;
            text-align: left;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            transition: color var(--transition-fast);
        }
        .faq-q:hover {
            color: var(--accent-dark);
        }
        .faq-q .faq-icon {
            flex-shrink: 0;
            transition: transform var(--transition-fast);
            color: var(--text-muted);
            font-size: 0.85rem;
        }
        .faq-item.open .faq-q .faq-icon {
            transform: rotate(180deg);
            color: var(--accent);
        }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 20px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .faq-item.open .faq-a {
            max-height: 400px;
            padding: 0 20px 18px;
        }

        /* ========== CTA区块 ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.1;
            z-index: 0;
        }
        .cta-section>* {
            position: relative;
            z-index: 1;
        }
        .cta-section h3 {
            font-size: 1.8rem;
            font-weight: 700;
            margin: 0 0 12px;
        }
        .cta-section p {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.8);
            margin: 0 0 24px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 32px 20px;
            }
            .cta-section h3 {
                font-size: 1.4rem;
            }
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--primary-dark);
            color: #cbd5e1;
            padding: 56px 0 28px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-brand {
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }
        .footer-desc {
            font-size: 0.875rem;
            color: #94a3b8;
            line-height: 1.6;
            margin: 0 0 10px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin: 0 0 14px;
        }
        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            color: #94a3b8;
            font-size: 0.875rem;
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: var(--accent-light);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
            color: #64748b;
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 560px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        /* ========== 面包屑 ========== */
        .breadcrumb {
            display: flex;
            gap: 8px;
            align-items: center;
            font-size: 0.85rem;
            color: var(--text-muted);
            padding: 16px 0;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--accent-dark);
        }
        .breadcrumb .sep {
            color: var(--text-light);
        }
        .breadcrumb .current {
            color: var(--text-primary);
            font-weight: 500;
        }

        /* ========== 标签徽章 ========== */
        .badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 14px;
            font-size: 0.78rem;
            font-weight: 600;
            background: var(--bg-sand);
            color: var(--accent-dark);
        }
        .badge-new {
            background: #e8f5e9;
            color: #2e7d32;
        }
        .badge-hot {
            background: #fce4ec;
            color: #c62828;
        }

        /* ========== 分隔标题 ========== */
        .section-heading {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-heading .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-dark);
            background: var(--bg-sand);
            padding: 4px 14px;
            border-radius: 16px;
            margin-bottom: 10px;
            letter-spacing: 0.03em;
        }
        .section-heading h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 8px;
            letter-spacing: -0.02em;
        }
        .section-heading .section-desc {
            font-size: 0.95rem;
            color: var(--text-muted);
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .section-heading h2 {
                font-size: 1.5rem;
            }
            .section-heading {
                margin-bottom: 28px;
            }
        }

        /* ========== 平滑滚动 ========== */
        html {
            scroll-behavior: smooth;
        }

        /* ========== focus可访问性 ========== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

/* roulang page: category4 */
/* ===== 设计变量补充 ===== */
        :root {
            --brand-500: #1a3c5e;
            --brand-600: #15304d;
            --brand-700: #10253d;
            --accent-500: #d4a30a;
            --accent-400: #f0b90b;
            --text-primary: #1a1a2e;
            --text-secondary: #4a5568;
            --text-muted: #94a3b8;
            --bg-page: #f8fafc;
            --bg-white: #ffffff;
            --border-light: #e8ecf1;
            --shadow-soft: 0 2px 16px rgba(0, 0, 0, 0.06);
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
            --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.14);
            --radius-md: 0.5rem;
            --radius-lg: 0.75rem;
            --radius-xl: 1rem;
            --radius-2xl: 1.25rem;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 基础 Reset 补充 ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-page);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input {
            font-family: inherit;
        }

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

        @media (min-width: 1280px) {
            .container-custom {
                padding-left: 0;
                padding-right: 0;
            }
        }

        /* ===== 导航样式 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: #ffffff;
            box-shadow: var(--shadow-nav, 0 2px 20px rgba(0, 0, 0, 0.07));
            border-bottom: 1px solid var(--border-light);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 1.5rem;
        }

        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, #1a3c5e 0%, #15304d 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #f0b90b;
            font-weight: 700;
            font-size: 1.1rem;
            letter-spacing: -0.5px;
        }

        .logo-text {
            font-weight: 700;
            font-size: 1.25rem;
            color: #1a3c5e;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .main-nav {
            display: flex;
            align-items: center;
        }

        .nav-list {
            display: flex;
            align-items: center;
            list-style: none;
            margin: 0;
            padding: 0;
            gap: 0.25rem;
        }

        .nav-list li a {
            display: inline-flex;
            align-items: center;
            padding: 0.55rem 1.1rem;
            border-radius: 0.5rem;
            font-size: 0.95rem;
            font-weight: 500;
            color: #4a5568;
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-list li a:hover {
            color: #1a3c5e;
            background: #f1f5f9;
        }

        .nav-list li a.nav-active {
            color: #ffffff;
            background: #1a3c5e;
            font-weight: 600;
            box-shadow: 0 2px 8px rgba(26, 60, 94, 0.25);
        }

        .nav-list li a.nav-active:hover {
            background: #15304d;
            color: #ffffff;
        }

        /* 移动端菜单按钮 */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: #1a3c5e;
            padding: 0.5rem;
            cursor: pointer;
            border-radius: 0.5rem;
            transition: background var(--transition-fast);
        }

        .mobile-menu-btn:hover {
            background: #f1f5f9;
        }

        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: flex;
                align-items: center;
                justify-content: center;
            }

            .main-nav {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: #ffffff;
                border-bottom: 2px solid #e8ecf1;
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
                padding: 1rem 1.25rem;
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
                z-index: 999;
            }

            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }

            .nav-list {
                flex-direction: column;
                gap: 0.35rem;
                width: 100%;
            }

            .nav-list li {
                width: 100%;
            }

            .nav-list li a {
                display: flex;
                width: 100%;
                padding: 0.7rem 1rem;
                border-radius: 0.5rem;
                font-size: 1rem;
            }

            .header-inner {
                height: 60px;
            }
        }

        @media (max-width: 520px) {
            .logo-text {
                font-size: 1.1rem;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 0.95rem;
                border-radius: 8px;
            }
            .header-inner {
                height: 56px;
                gap: 0.75rem;
            }
        }

        /* ===== Hero 区域 ===== */
        .hero-section {
            position: relative;
            background: linear-gradient(160deg, #0b1a2e 0%, #10253d 30%, #1a3c5e 70%, #15304d 100%);
            padding: 3.5rem 0 4rem;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(to top, rgba(11, 26, 46, 0.6), transparent);
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 700px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(240, 185, 11, 0.18);
            color: #f0b90b;
            border: 1px solid rgba(240, 185, 11, 0.35);
            padding: 0.4rem 1.2rem;
            border-radius: 2rem;
            font-size: 0.85rem;
            font-weight: 500;
            letter-spacing: 0.04em;
            margin-bottom: 1.25rem;
        }

        .hero-title {
            font-size: 2.6rem;
            font-weight: 700;
            color: #ffffff;
            line-height: 1.3;
            margin: 0 0 1rem;
            letter-spacing: 0.02em;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.7;
            margin: 0 0 2rem;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-cta-row {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #f0b90b;
            color: #1a3c5e;
            font-weight: 600;
            padding: 0.75rem 1.75rem;
            border-radius: 0.6rem;
            font-size: 1rem;
            border: none;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 16px rgba(240, 185, 11, 0.3);
            cursor: pointer;
        }

        .btn-primary:hover {
            background: #e0a800;
            box-shadow: 0 6px 22px rgba(240, 185, 11, 0.4);
            transform: translateY(-2px);
        }

        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: transparent;
            color: #ffffff;
            font-weight: 500;
            padding: 0.75rem 1.75rem;
            border-radius: 0.6rem;
            font-size: 1rem;
            border: 2px solid rgba(255, 255, 255, 0.4);
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .btn-outline-light:hover {
            border-color: #ffffff;
            background: rgba(255, 255, 255, 0.08);
        }

        @media (max-width: 768px) {
            .hero-section {
                padding: 2.5rem 0 3rem;
            }
            .hero-title {
                font-size: 1.9rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .hero-badge {
                font-size: 0.78rem;
                padding: 0.35rem 1rem;
            }
        }

        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.5rem;
            }
            .hero-subtitle {
                font-size: 0.9rem;
            }
            .hero-cta-row {
                flex-direction: column;
                gap: 0.75rem;
            }
            .btn-primary,
            .btn-outline-light {
                width: 100%;
                justify-content: center;
                padding: 0.7rem 1.25rem;
                font-size: 0.95rem;
            }
        }

        /* ===== 板块通用 ===== */
        .section-block {
            padding: 3.5rem 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 2.5rem;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: #d4a30a;
            background: rgba(212, 163, 10, 0.08);
            padding: 0.3rem 1rem;
            border-radius: 2rem;
            margin-bottom: 0.75rem;
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: #1a1a2e;
            margin: 0 0 0.6rem;
            letter-spacing: 0.01em;
        }

        .section-desc {
            font-size: 1rem;
            color: #64748b;
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.65;
        }

        @media (max-width: 768px) {
            .section-block {
                padding: 2.5rem 0;
            }
            .section-title {
                font-size: 1.45rem;
            }
            .section-header {
                margin-bottom: 1.75rem;
            }
        }

        /* ===== 课程卡片 ===== */
        .course-card {
            background: #ffffff;
            border-radius: var(--radius-xl);
            padding: 1.75rem 1.5rem;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            border: 1px solid transparent;
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 0.75rem;
        }

        .course-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
            border-color: #e2e8f0;
        }

        .course-card .course-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            flex-shrink: 0;
        }

        .course-card .course-level {
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            padding: 0.25rem 0.7rem;
            border-radius: 1rem;
        }

        .course-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: #1a1a2e;
            margin: 0;
        }

        .course-card p {
            font-size: 0.9rem;
            color: #64748b;
            margin: 0;
            line-height: 1.6;
        }

        .course-card .course-link {
            font-weight: 600;
            font-size: 0.9rem;
            color: #1a3c5e;
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            transition: gap var(--transition-fast);
            margin-top: auto;
        }

        .course-card .course-link:hover {
            gap: 0.6rem;
            color: #15304d;
        }

        /* ===== 教程卡片（带图） ===== */
        .tutorial-card {
            background: #ffffff;
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            border: 1px solid transparent;
            display: flex;
            flex-direction: column;
        }

        .tutorial-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
            border-color: #e2e8f0;
        }

        .tutorial-card .tutorial-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }

        .tutorial-card .tutorial-body {
            padding: 1.25rem 1.25rem 1.5rem;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
            flex: 1;
        }

        .tutorial-card .tutorial-tag {
            font-size: 0.75rem;
            font-weight: 600;
            color: #d4a30a;
            letter-spacing: 0.04em;
        }

        .tutorial-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: #1a1a2e;
            margin: 0;
            line-height: 1.4;
        }

        .tutorial-card p {
            font-size: 0.88rem;
            color: #64748b;
            margin: 0;
            line-height: 1.55;
        }

        .tutorial-card .tutorial-meta {
            font-size: 0.78rem;
            color: #94a3b8;
            display: flex;
            gap: 1rem;
            align-items: center;
        }

        /* ===== 技巧卡片 ===== */
        .tip-card {
            background: #ffffff;
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            box-shadow: var(--shadow-soft);
            border-left: 4px solid #1a3c5e;
            transition: all var(--transition-fast);
        }

        .tip-card:hover {
            box-shadow: var(--shadow-card);
            border-left-color: #f0b90b;
        }

        .tip-card h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #1a1a2e;
            margin: 0 0 0.4rem;
        }

        .tip-card p {
            font-size: 0.9rem;
            color: #64748b;
            margin: 0;
            line-height: 1.6;
        }

        /* ===== 术语标签 ===== */
        .term-tag {
            display: inline-block;
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            padding: 0.5rem 1rem;
            border-radius: 2rem;
            font-size: 0.88rem;
            color: #4a5568;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .term-tag:hover {
            background: #1a3c5e;
            color: #ffffff;
            border-color: #1a3c5e;
            box-shadow: 0 2px 8px rgba(26, 60, 94, 0.2);
        }

        /* ===== FAQ 样式 ===== */
        .faq-item {
            background: #ffffff;
            border-radius: var(--radius-lg);
            padding: 1.25rem 1.5rem;
            box-shadow: var(--shadow-soft);
            border: 1px solid #e8ecf1;
            transition: all var(--transition-fast);
        }

        .faq-item:hover {
            box-shadow: var(--shadow-card);
            border-color: #dde3ea;
        }

        .faq-item h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #1a1a2e;
            margin: 0 0 0.6rem;
            display: flex;
            align-items: flex-start;
            gap: 0.5rem;
        }

        .faq-item h4 .faq-q {
            color: #1a3c5e;
            flex-shrink: 0;
            font-weight: 700;
        }

        .faq-item p {
            font-size: 0.9rem;
            color: #64748b;
            margin: 0;
            line-height: 1.65;
            padding-left: 1.6rem;
        }

        /* ===== CTA 区块 ===== */
        .cta-section {
            background: linear-gradient(150deg, #10253d 0%, #1a3c5e 50%, #15304d 100%);
            padding: 3.5rem 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            background: rgba(240, 185, 11, 0.06);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -40px;
            width: 160px;
            height: 160px;
            background: rgba(240, 185, 11, 0.04);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section .cta-content {
            position: relative;
            z-index: 2;
            max-width: 600px;
            margin: 0 auto;
        }

        .cta-section h3 {
            font-size: 1.7rem;
            font-weight: 700;
            color: #ffffff;
            margin: 0 0 0.75rem;
        }

        .cta-section p {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.78);
            margin: 0 0 1.75rem;
            line-height: 1.6;
        }

        /* ===== 页脚样式 ===== */
        .site-footer {
            background: #0f1a2b;
            color: #cbd5e1;
            padding: 3rem 0 1.5rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 0.6rem;
            letter-spacing: 0.02em;
        }

        .footer-desc {
            font-size: 0.88rem;
            color: #94a3b8;
            line-height: 1.6;
            margin: 0 0 0.75rem;
        }

        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #ffffff;
            margin: 0 0 0.75rem;
            letter-spacing: 0.03em;
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: 0.4rem;
        }

        .footer-col ul li a {
            font-size: 0.85rem;
            color: #94a3b8;
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: #f0b90b;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.25rem;
            text-align: center;
            font-size: 0.8rem;
            color: #64748b;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1.5rem;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.25rem;
            }
            .site-footer {
                padding: 2rem 0 1rem;
            }
        }

        /* ===== 网格辅助 ===== */
        .grid-2col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
        }

        .grid-3col {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }

        .grid-4col {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.25rem;
        }

        @media (max-width: 900px) {
            .grid-4col {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-3col {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 600px) {
            .grid-2col {
                grid-template-columns: 1fr;
            }
            .grid-3col {
                grid-template-columns: 1fr;
            }
            .grid-4col {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 其他工具 ===== */
        .text-muted {
            color: #94a3b8;
        }

        .divider {
            width: 60px;
            height: 4px;
            background: #f0b90b;
            border-radius: 2px;
            margin: 0.5rem auto 0;
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

        /* 平滑滚动偏移 */
        @media (min-width: 769px) {
            html {
                scroll-padding-top: 80px;
            }
        }

        @media (max-width: 768px) {
            html {
                scroll-padding-top: 70px;
            }
        }