/* ============================================
   Design System: 白菜网 黑黑 - bcwhhe.cn
   Concept: "翡翠层叠" — 纸艺灵感 × 自然绿意
   Award-Winning Visual Identity
   ============================================ */

/* ------------------------------------------
   1. 基础重置 & 全局变量
   ------------------------------------------ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色板 — 翡翠白菜 */
    --color-bg: #f6f2ea;
    --color-bg-alt: #efe9df;
    --color-surface: #ffffff;
    --color-surface-dim: #faf7f1;

    --color-primary: #3a8a5c;
    --color-primary-light: #e9f3ec;
    --color-primary-dark: #1e4d31;

    --color-accent: #d4a051;
    --color-accent-light: #f5e8d0;
    --color-accent-dark: #a87a32;

    --color-text: #1e2e24;
    --color-text-secondary: #5a6e60;
    --color-text-muted: #8a9a8e;

    --color-border: #e0d9cf;
    --color-border-light: #ede8e0;

    --shadow-sm: 0 2px 8px rgba(30, 46, 36, 0.06);
    --shadow-md: 0 8px 28px rgba(30, 46, 36, 0.08);
    --shadow-lg: 0 20px 48px rgba(30, 46, 36, 0.12);
    --shadow-xl: 0 40px 80px rgba(30, 46, 36, 0.16);

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 9999px;

    --font-sans: system-ui, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    --transition: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 装饰性背景纹理 — 细微纸纹 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(58, 138, 92, 0.03) 0%, transparent 60%),
        radial-gradient(circle at 80% 70%, rgba(212, 160, 81, 0.03) 0%, transparent 60%),
        repeating-linear-gradient(45deg, transparent, transparent 40px, rgba(0, 0, 0, 0.005) 40px, rgba(0, 0, 0, 0.005) 41px);
}

/* ------------------------------------------
   2. 核心布局
   ------------------------------------------ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
    position: relative;
}

.section:nth-child(even) {
    background: var(--color-bg-alt);
}

.section:nth-child(even) .container {
    position: relative;
    z-index: 1;
}

/* 装饰性分割弧线 */
.section::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 40px;
    background: var(--color-bg);
    border-radius: 50% 50% 0 0 / 100% 100% 0 0;
    z-index: 2;
}

.section:nth-child(even)::after {
    background: var(--color-bg-alt);
}

.section:last-child::after {
    display: none;
}

/* ------------------------------------------
   3. 导航 — 固定顶部 | 纸艺质感
   ------------------------------------------ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(246, 242, 234, 0.92);
    backdrop-filter: blur(20px) saturate(1.2);
    border-bottom: 1px solid var(--color-border-light);
    transition: var(--transition);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.25rem;
    text-decoration: none;
    color: var(--color-primary-dark);
    letter-spacing: -0.3px;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.02);
    color: var(--color-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background: var(--color-primary-light);
    color: var(--color-primary);
    position: relative;
    overflow: hidden;
}

/* 图标内的小装饰 — 白菜叶抽象 */
.logo-icon::after {
    content: '';
    position: absolute;
    bottom: -4px;
    right: -4px;
    width: 16px;
    height: 16px;
    background: var(--color-accent-light);
    border-radius: 50%;
    opacity: 0.5;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.main-nav a {
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition);
    position: relative;
    padding: 4px 0;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transform: translateX(-50%);
    transition: var(--transition);
}

.main-nav a:hover {
    color: var(--color-primary-dark);
}

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

.nav-cta {
    padding: 10px 24px !important;
    border-radius: var(--radius-full) !important;
    background: var(--color-primary) !important;
    color: #fff !important;
    font-weight: 700 !important;
    font-size: 0.85rem !important;
    letter-spacing: 0.3px;
    box-shadow: 0 4px 12px rgba(58, 138, 92, 0.3);
    transition: var(--transition) !important;
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 8px 24px rgba(58, 138, 92, 0.4) !important;
    background: var(--color-primary-dark) !important;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    border: none;
    background: none;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ------------------------------------------
   4. 首页Hero — 杂志层叠风格
   ------------------------------------------ */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 72px;
    overflow: hidden;
}

/* 装饰性大圆 — 抽象白菜叶 */
.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(58, 138, 92, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -15%;
    left: -8%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(212, 160, 81, 0.05) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    max-width: 720px;
    position: relative;
    z-index: 1;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    padding: 6px 18px;
    border-radius: var(--radius-full);
    background: var(--color-primary-light);
    color: var(--color-primary);
    margin-bottom: 20px;
    border: 1px solid rgba(58, 138, 92, 0.15);
}

.hero h1 {
    font-size: 3.4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--color-primary-dark);
    letter-spacing: -1px;
}

/* 标题中的装饰性高亮 */
.hero h1 span {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 520px;
    margin-bottom: 36px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    position: relative;
}

.hero-image::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    border: 2px solid rgba(255, 255, 255, 0.2);
    pointer-events: none;
    z-index: 1;
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.hero-image:hover img {
    transform: scale(1.02);
}

/* ------------------------------------------
   5. 按钮
   ------------------------------------------ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: var(--transition);
    letter-spacing: 0.2px;
    position: relative;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 16px rgba(58, 138, 92, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(58, 138, 92, 0.4);
    background: var(--color-primary-dark);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(58, 138, 92, 0.2);
}

/* ------------------------------------------
   6. 标签 & 标题
   ------------------------------------------ */
.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    background: var(--color-primary-light);
    color: var(--color-primary);
    margin-bottom: 16px;
    border: 1px solid rgba(58, 138, 92, 0.1);
}

.section-title {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--color-primary-dark);
    letter-spacing: -0.5px;
    line-height: 1.15;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-bottom: 48px;
    line-height: 1.7;
}

/* ------------------------------------------
   7. 卡片网格 — 层叠纸片效果
   ------------------------------------------ */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}

.category-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    border: 1px solid var(--color-border-light);
    transition: var(--transition);
    position: relative;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

/* 卡片上的装饰弧线 */
.category-card::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 80px;
    height: 80px;
    background: var(--color-primary-light);
    border-radius: 50%;
    opacity: 0.4;
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.category-card:hover::before {
    width: 120px;
    height: 120px;
    opacity: 0.6;
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.4rem;
    background: var(--color-primary-light);
    color: var(--color-primary);
    position: relative;
    z-index: 1;
}

.category-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-primary-dark);
    position: relative;
    z-index: 1;
}

.category-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.card-link {
    font-weight: 700;
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.card-link:hover {
    color: var(--color-accent-dark);
    gap: 12px;
}

/* ------------------------------------------
   8. 特性块 — 左右不对称布局
   ------------------------------------------ */
.feature-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.feature-block.reverse {
    direction: rtl;
}

.feature-block.reverse>* {
    direction: ltr;
}

.feature-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.feature-image::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    border: 2px solid rgba(255, 255, 255, 0.2);
    pointer-events: none;
    z-index: 1;
}

.feature-image::after {
    content: '';
    position: absolute;
    bottom: -12px;
    right: -12px;
    width: 60px;
    height: 60px;
    background: var(--color-accent-light);
    border-radius: 50%;
    z-index: 0;
    opacity: 0.5;
}

.feature-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.feature-image:hover img {
    transform: scale(1.03);
}

.feature-text {
    padding: 16px 0;
}

.feature-text h3 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-primary-dark);
    margin-bottom: 16px;
    line-height: 1.2;
}

.feature-text p {
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 10px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border-light);
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: '✦';
    font-weight: 700;
    color: var(--color-primary);
    font-size: 1.1rem;
}

/* ------------------------------------------
   9. 数据条 — 统计数字
   ------------------------------------------ */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    text-align: center;
}

.stat-item {
    padding: 32px 20px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.1;
    letter-spacing: -1px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-top: 8px;
    font-weight: 500;
}

/* ------------------------------------------
   10. 内容墙 — 图文混合
   ------------------------------------------ */
.content-wall {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 28px;
}

.content-wall-item {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.content-wall-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.content-wall-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

.content-wall-item:hover img {
    transform: scale(1.04);
}

.content-wall-body {
    padding: 24px 20px 20px;
}

.content-wall-body h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 8px;
}

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

/* ------------------------------------------
   11. FAQ — 手风琴风格
   ------------------------------------------ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    margin-bottom: 10px;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

.faq-item .faq-question {
    padding: 20px 24px;
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-primary-dark);
    transition: var(--transition);
    user-select: none;
}

.faq-item .faq-question::after {
    content: '+';
    font-size: 1.2rem;
    color: var(--color-primary);
    font-weight: 300;
    transition: var(--transition);
}

.faq-item.open .faq-question::after {
    content: '−';
    transform: rotate(0deg);
}

.faq-item .faq-answer {
    padding: 0 24px 20px;
    display: none;
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.faq-item.open .faq-answer {
    display: block;
    animation: fadeSlideIn 0.35s ease;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ------------------------------------------
   12. CTA横幅 — 翡翠渐变
   ------------------------------------------ */
.cta-banner {
    padding: 64px 48px;
    text-align: center;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

/* 装饰光晕 */
.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.cta-banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(212, 160, 81, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.cta-banner h2 {
    color: #fff;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.cta-banner p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 28px;
    font-size: 1.05rem;
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary {
    background: #fff;
    color: var(--color-primary-dark);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
    background: var(--color-accent-light);
    color: var(--color-primary-dark);
}

/* ------------------------------------------
   13. 页脚 — 深绿调（非黑色）
   ------------------------------------------ */
.site-footer {
    padding: 64px 0 28px;
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.85);
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: -2px;
    left: 0;
    width: 100%;
    height: 30px;
    background: var(--color-bg);
    border-radius: 0 0 50% 50% / 0 0 100% 100%;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
}

.footer-brand h3 {
    font-size: 1.3rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 0.9rem;
    opacity: 0.7;
    line-height: 1.7;
    max-width: 300px;
}

.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

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

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul a {
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--color-accent);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 48px;
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
    opacity: 0.6;
    color: rgba(255, 255, 255, 0.7);
}

/* ------------------------------------------
   14. 工具类
   ------------------------------------------ */
.text-accent {
    color: var(--color-accent);
}

.text-center {
    text-align: center;
}

.text-center .section-desc {
    margin-left: auto;
    margin-right: auto;
}

.seo-description {
    max-width: 600px;
    margin: 0 auto 48px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.mt-0 {
    margin-top: 0;
}

.mb-0 {
    margin-bottom: 0;
}

/* 额外装饰性元素 */
.ornament {
    display: inline-block;
    width: 40px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    margin: 0 8px;
    vertical-align: middle;
}

/* ------------------------------------------
   15. 响应式设计
   ------------------------------------------ */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.8rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .footer-grid .footer-brand {
        grid-column: 1 / -1;
    }

    .feature-block {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding: 120px 0 60px;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

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

    .hero-buttons {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .feature-block {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .feature-block.reverse {
        direction: ltr;
    }

    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .main-nav {
        display: none;
    }

    .menu-toggle {
        display: flex;
        background: none;
        border: none;
        cursor: pointer;
    }

    .main-nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--color-surface);
        padding: 24px 28px;
        gap: 16px;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--color-border);
        animation: slideDown 0.3s ease;
    }

    .main-nav.open a {
        padding: 8px 0;
        font-size: 1rem;
    }

    .main-nav.open .nav-cta {
        text-align: center;
        margin-top: 8px;
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .cta-banner {
        padding: 48px 24px;
    }

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

    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 20px;
    }

    .content-wall {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 20px;
    }

    .stat-number {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

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

    .hero-eyebrow {
        font-size: 0.7rem;
        padding: 4px 14px;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .cards-grid,
    .content-wall,
    .stats-bar {
        grid-template-columns: 1fr;
    }

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

    .hero-buttons {
        flex-direction: column;
    }

    .feature-text h3 {
        font-size: 1.4rem;
    }

    .stat-item {
        padding: 24px 16px;
    }

    .cta-banner {
        padding: 36px 20px;
        border-radius: var(--radius-lg);
    }

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

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

    .site-header .header-inner {
        height: 64px;
    }
}

/* ------------------------------------------
   16. 微交互动画
   ------------------------------------------ */
@media (prefers-reduced-motion: no-preference) {
    .category-card,
    .content-wall-item,
    .stat-item,
    .faq-item {
        transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
            box-shadow 0.4s ease,
            border-color 0.4s ease;
    }

    .hero h1 {
        animation: fadeInUp 0.8s ease;
    }

    .hero p {
        animation: fadeInUp 0.8s ease 0.1s both;
    }

    .hero-buttons {
        animation: fadeInUp 0.8s ease 0.2s both;
    }

    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(24px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}