/* roulang page: index */
:root {
            --primary: #3b1f5e;
            --primary-light: #5a3b8a;
            --primary-dark: #241238;
            --accent: #f4772e;
            --accent-hover: #e05e1a;
            --gold: #e8b04b;
            --bg: #fbf9f6;
            --bg-dark: #1f1b2d;
            --surface: #ffffff;
            --surface-alt: #f5f0eb;
            --text: #1a1a2e;
            --text-light: #6b6b7b;
            --text-on-dark: #f0edf5;
            --text-on-dark-muted: #b8b0c4;
            --border: #e8e5e0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 48px;
            --spacing-xl: 72px;
            --transition: 0.25s ease;
            --font-serif: 'Georgia', 'Noto Serif SC', 'SimSun', serif;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --container-max: 1140px;
            --nav-height: 72px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border: 0;
        }

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

        a:hover {
            color: var(--accent);
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--gold);
            outline-offset: 2px;
            border-radius: 4px;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
        }

        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: inherit;
        }

        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        .section {
            padding: var(--spacing-xl) 0;
        }

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

        .section--dark {
            background-color: var(--bg-dark);
            color: var(--text-on-dark);
        }

        .section-header {
            max-width: 680px;
            margin: 0 auto var(--spacing-lg);
            text-align: center;
        }

        .section-header .eyebrow {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: var(--spacing-xs);
        }

        .section-header h2 {
            font-size: 2rem;
            margin-bottom: var(--spacing-sm);
            color: var(--text);
            font-family: var(--font-serif);
        }

        .section-header p {
            font-size: 1.05rem;
            color: var(--text-light);
            line-height: 1.8;
        }

        .section--dark .section-header h2 {
            color: var(--text-on-dark);
        }

        .section--dark .section-header p {
            color: var(--text-on-dark-muted);
        }

        /* ========== 导航 ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(232, 229, 224, 0.6);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-md);
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .nav-logo .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-light);
            padding: 6px 10px;
            border-radius: 6px;
            position: relative;
        }

        .nav-links a:hover,
        .nav-links a:focus-visible {
            color: var(--primary);
        }

        .nav-links a[aria-current="page"] {
            color: var(--primary);
            font-weight: 600;
        }

        .nav-links a[aria-current="page"]::after {
            content: '';
            position: absolute;
            left: 10px;
            right: 10px;
            bottom: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            background: var(--primary);
            color: #fff;
            border-radius: 999px;
            font-size: 0.9rem;
            font-weight: 600;
            white-space: nowrap;
            flex-shrink: 0;
            border: 2px solid var(--primary);
        }

        .nav-cta:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .nav-cta:active {
            transform: translateY(0);
            box-shadow: var(--shadow-sm);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
            border-radius: 6px;
        }

        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--primary);
            border-radius: 4px;
            transition: transform var(--transition), opacity var(--transition);
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            background: linear-gradient(160deg, #1f1b2d 0%, #2d1b4e 55%, #3b1f5e 100%);
            color: var(--text-on-dark);
            padding: calc(var(--spacing-xl) + 24px) 0 var(--spacing-xl);
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -200px;
            right: -120px;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(232, 176, 75, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -180px;
            left: -100px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(244, 119, 46, 0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero .container {
            position: relative;
            z-index: 2;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 999px;
            font-size: 0.85rem;
            font-weight: 500;
            letter-spacing: 0.04em;
            color: var(--gold);
            margin-bottom: var(--spacing-md);
            backdrop-filter: blur(8px);
        }

        .hero-badge .dot {
            display: inline-block;
            width: 7px;
            height: 7px;
            background: var(--gold);
            border-radius: 50%;
            animation: pulse-dot 2s ease-in-out infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.5;
                transform: scale(1.4);
            }
        }

        .hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: var(--spacing-md);
            max-width: 800px;
            font-family: var(--font-serif);
            letter-spacing: 0.01em;
            color: #fff;
        }

        .hero h1 .highlight {
            color: var(--gold);
            position: relative;
            white-space: nowrap;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            line-height: 1.8;
            color: var(--text-on-dark-muted);
            max-width: 640px;
            margin-bottom: var(--spacing-lg);
        }

        .hero-search {
            display: flex;
            align-items: stretch;
            gap: 0;
            width: 100%;
            max-width: 560px;
            background: #fff;
            border-radius: 999px;
            overflow: hidden;
            box-shadow: var(--shadow-xl);
            margin-bottom: var(--spacing-md);
            transition: box-shadow var(--transition);
        }

        .hero-search:focus-within {
            box-shadow: 0 0 0 4px rgba(232, 176, 75, 0.3), var(--shadow-xl);
        }

        .hero-search input {
            flex: 1;
            padding: 16px 22px;
            font-size: 0.98rem;
            color: var(--text);
            background: transparent;
            border: none;
            outline: none;
            min-width: 0;
        }

        .hero-search input::placeholder {
            color: #a8a3b8;
        }

        .hero-search button {
            padding: 16px 28px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            border-radius: 0 999px 999px 0;
            white-space: nowrap;
            border: none;
            flex-shrink: 0;
        }

        .hero-search button:hover {
            background: var(--accent-hover);
        }

        .hero-search button:active {
            transform: scale(0.98);
        }

        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 10px;
            margin-bottom: var(--spacing-md);
        }

        .hero-tags span.tag-label {
            font-size: 0.85rem;
            color: var(--text-on-dark-muted);
            margin-right: 4px;
        }

        .hero-tags a {
            display: inline-block;
            padding: 5px 14px;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 500;
            color: var(--text-on-dark);
            transition: all var(--transition);
        }

        .hero-tags a:hover {
            background: rgba(255, 255, 255, 0.18);
            border-color: var(--gold);
            color: var(--gold);
            transform: translateY(-1px);
        }

        .hero-stats-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-md);
            margin-top: var(--spacing-sm);
        }

        .hero-stat {
            text-align: center;
            min-width: 100px;
        }

        .hero-stat .stat-number {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--gold);
            display: block;
            letter-spacing: -0.01em;
        }

        .hero-stat .stat-label {
            font-size: 0.8rem;
            color: var(--text-on-dark-muted);
        }

        .hero-stat-divider {
            width: 1px;
            height: 32px;
            background: rgba(255, 255, 255, 0.18);
        }

        /* ========== 特色板块 ========== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
        }

        .feature-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }

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

        .feature-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #f5e8d8, #f0d5b8);
            color: var(--accent);
            border-radius: 14px;
            font-size: 1.4rem;
            margin-bottom: var(--spacing-sm);
            flex-shrink: 0;
        }

        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }

        .feature-card p {
            font-size: 0.92rem;
            color: var(--text-light);
            line-height: 1.75;
            flex-grow: 1;
        }

        /* ========== 热门书单 ========== */
        .books-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }

        .book-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

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

        .book-card-cover {
            position: relative;
            height: 180px;
            background: linear-gradient(135deg, #e8e0f0 0%, #d8cce8 40%, #c4b5d9 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .book-card-cover::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(to bottom, rgba(0, 0, 0, 0) 50%, rgba(0, 0, 0, 0.3));
        }

        .book-card-cover .cover-title {
            position: relative;
            z-index: 2;
            font-family: var(--font-serif);
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-dark);
            text-align: center;
            padding: 0 16px;
            letter-spacing: 0.06em;
        }

        .book-card-cover .cover-badge {
            position: absolute;
            top: 12px;
            right: 12px;
            z-index: 3;
            background: var(--accent);
            color: #fff;
            font-size: 0.72rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            letter-spacing: 0.04em;
        }

        .book-card-body {
            padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }

        .book-card-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text);
        }

        .book-card-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.8rem;
            color: var(--text-light);
            margin-bottom: 10px;
        }

        .book-card-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .book-card-meta .meta-item + .meta-item::before {
            content: '·';
            margin-right: 4px;
            color: var(--border);
        }

        .book-card-body p {
            font-size: 0.88rem;
            color: var(--text-light);
            line-height: 1.7;
            flex-grow: 1;
            margin-bottom: var(--spacing-sm);
        }

        .book-card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--primary);
            transition: color var(--transition), gap var(--transition);
            align-self: flex-start;
        }

        .book-card-link:hover {
            color: var(--accent);
            gap: 10px;
        }

        /* ========== 数据统计 ========== */
        .stats-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            color: #fff;
            padding: var(--spacing-lg) 0;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
            text-align: center;
        }

        .stat-item .stat-value {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--gold);
            display: block;
            margin-bottom: 4px;
            font-family: var(--font-serif);
        }

        .stat-item .stat-name {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.75);
            font-weight: 500;
        }

        /* ========== 阅读指南 ========== */
        .guide-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
            counter-reset: step-counter;
        }

        .guide-step {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            position: relative;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            counter-increment: step-counter;
        }

        .guide-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }

        .guide-step::before {
            content: counter(step-counter, decimal-leading-zero);
            position: absolute;
            top: -16px;
            left: 20px;
            width: 32px;
            height: 32px;
            background: var(--accent);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: -0.01em;
        }

        .guide-step h3 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 8px;
            margin-top: 8px;
            color: var(--text);
        }

        .guide-step p {
            font-size: 0.88rem;
            color: var(--text-light);
            line-height: 1.7;
        }

        /* ========== 读者评价 ========== */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }

        .testimonial-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .testimonial-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }

        .testimonial-quote {
            font-size: 0.95rem;
            line-height: 1.8;
            color: var(--text);
            margin-bottom: var(--spacing-sm);
            flex-grow: 1;
            font-style: italic;
            position: relative;
            padding-left: 16px;
            border-left: 3px solid var(--gold);
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .testimonial-author .avatar {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, #d8cce8, #b8a5d0);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        .testimonial-author .author-info {
            font-size: 0.82rem;
            color: var(--text-light);
            line-height: 1.4;
        }

        .testimonial-author .author-info strong {
            display: block;
            font-size: 0.88rem;
            color: var(--text);
            font-weight: 600;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 720px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

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

        .faq-item:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-md);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            width: 100%;
            padding: 18px 20px;
            text-align: left;
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--text);
            background: none;
            border: none;
            cursor: pointer;
            transition: background var(--transition), color var(--transition);
        }

        .faq-question:hover {
            color: var(--primary);
            background: var(--surface-alt);
        }

        .faq-question .faq-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 22px;
            height: 22px;
            font-size: 1.1rem;
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 20px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }

        .faq-answer p {
            font-size: 0.92rem;
            color: var(--text-light);
            line-height: 1.75;
        }

        /* ========== CTA ========== */
        .cta-section {
            background: linear-gradient(160deg, #2d1b4e 0%, #3b1f5e 100%);
            color: #fff;
            text-align: center;
            padding: var(--spacing-xl) 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -100px;
            left: 50%;
            transform: translateX(-50%);
            width: 700px;
            height: 350px;
            background: radial-gradient(ellipse, rgba(232, 176, 75, 0.2) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: var(--spacing-sm);
            font-family: var(--font-serif);
            color: #fff;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: var(--text-on-dark-muted);
            max-width: 520px;
            margin: 0 auto var(--spacing-md);
            line-height: 1.8;
        }

        .cta-buttons {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-sm);
        }

        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: 999px;
            font-size: 0.95rem;
            font-weight: 600;
            transition: all var(--transition);
            white-space: nowrap;
        }

        .cta-btn--primary {
            background: var(--accent);
            color: #fff;
            border: 2px solid var(--accent);
        }

        .cta-btn--primary:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(244, 119, 46, 0.35);
        }

        .cta-btn--ghost {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.4);
        }

        .cta-btn--ghost:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-2px);
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: #15121f;
            color: var(--text-on-dark-muted);
            padding: var(--spacing-lg) 0 var(--spacing-sm);
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }

        .footer-brand .nav-logo {
            margin-bottom: var(--spacing-sm);
            color: #fff;
            font-size: 1.2rem;
        }

        .footer-brand p {
            font-size: 0.88rem;
            line-height: 1.75;
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.04em;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul a {
            font-size: 0.88rem;
            color: var(--text-on-dark-muted);
            transition: color var(--transition);
        }

        .footer-col ul a:hover {
            color: var(--gold);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: var(--spacing-sm);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.45);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.55);
        }

        .footer-bottom a:hover {
            color: var(--gold);
        }

        /* ========== 响应式 ========== */
        @media screen and (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .books-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .guide-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .testimonials-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-md);
            }
            .hero h1 {
                font-size: 2.2rem;
            }
        }

        @media screen and (max-width: 768px) {
            :root {
                --nav-height: 60px;
                --spacing-xl: 48px;
                --spacing-lg: 36px;
            }

            .nav-links {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                flex-direction: column;
                background: #fff;
                padding: var(--spacing-sm);
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                gap: 4px;
                z-index: 999;
            }

            .nav-links.open {
                display: flex;
            }

            .nav-links a {
                display: block;
                padding: 10px 16px;
                width: 100%;
                border-radius: 8px;
            }

            .nav-links a[aria-current="page"]::after {
                display: none;
            }

            .nav-cta {
                display: none;
            }

            .nav-toggle {
                display: flex;
            }

            .hero {
                padding: calc(var(--spacing-lg) + 16px) 0 var(--spacing-lg);
            }

            .hero h1 {
                font-size: 1.8rem;
            }

            .hero-subtitle {
                font-size: 1rem;
            }

            .hero-search {
                max-width: 100%;
            }

            .hero-search button {
                padding: 14px 18px;
                font-size: 0.88rem;
            }

            .hero-search input {
                padding: 14px 16px;
                font-size: 0.92rem;
            }

            .hero-stat-divider {
                display: none;
            }

            .features-grid {
                grid-template-columns: 1fr;
            }
            .books-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-sm);
            }
            .guide-steps {
                grid-template-columns: 1fr;
            }
            .testimonials-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-sm);
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .stat-item .stat-value {
                font-size: 1.6rem;
            }
        }

        @media screen and (max-width: 520px) {
            :root {
                --spacing-xl: 36px;
                --spacing-lg: 28px;
                --spacing-md: 16px;
                --spacing-sm: 12px;
            }

            .container {
                padding: 0 16px;
            }

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

            .hero-subtitle {
                font-size: 0.92rem;
            }

            .hero-search {
                flex-direction: column;
                border-radius: var(--radius-md);
                overflow: hidden;
            }

            .hero-search input {
                border-radius: var(--radius-md) var(--radius-md) 0 0;
                text-align: center;
            }

            .hero-search button {
                border-radius: 0 0 var(--radius-md) var(--radius-md);
                padding: 14px;
                font-size: 0.9rem;
            }

            .hero-tags {
                gap: 6px;
            }

            .hero-tags a {
                font-size: 0.75rem;
                padding: 4px 10px;
            }

            .hero-stats-row {
                gap: var(--spacing-sm);
            }

            .hero-stat .stat-number {
                font-size: 1.2rem;
            }

            .hero-stat .stat-label {
                font-size: 0.72rem;
            }

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-sm);
            }

            .stat-item .stat-value {
                font-size: 1.4rem;
            }

            .stat-item .stat-name {
                font-size: 0.78rem;
            }

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

            .faq-item.open .faq-answer {
                padding: 0 16px 14px;
            }

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

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

            .cta-btn {
                padding: 12px 22px;
                font-size: 0.88rem;
                width: 100%;
                justify-content: center;
            }

            .cta-buttons {
                flex-direction: column;
                width: 100%;
            }
        }