/* ============================================
   「橙紫幻境」— 完美真人视讯 设计系统
   风格：非对称杂志层叠 + 玻璃态 + 渐变流体
   获奖设计师：Awwwards Studio
   ============================================ */

/* 基础重置 */
*, *::before, *::after { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body { 
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif; 
    overflow-x: hidden; 
    background: #F4F6F9;
    color: #2D3436;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ============================================
   自定义属性
   ============================================ */
:root {
    --color-bg: #F4F6F9;
    --color-white: #FFFFFF;
    --color-primary: #FF7D6B;
    --color-primary-dark: #E86550;
    --color-primary-light: #FF9F8A;
    --color-secondary: #6C5CE7;
    --color-secondary-light: #8B7CF0;
    --color-accent: #FDCB6E;
    --color-accent-light: #FEE4A0;
    --color-text: #2D3436;
    --color-text-light: #636E72;
    --color-text-lighter: #B2BEC3;
    --color-border: rgba(108, 92, 231, 0.12);
    --color-glass: rgba(255, 255, 255, 0.72);
    --color-glass-border: rgba(255, 255, 255, 0.4);
    --shadow-sm: 0 2px 12px rgba(108, 92, 231, 0.06);
    --shadow-md: 0 8px 32px rgba(108, 92, 231, 0.10);
    --shadow-lg: 0 20px 60px rgba(108, 92, 231, 0.12);
    --shadow-xl: 0 40px 80px rgba(108, 92, 231, 0.16);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --font-display: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
    --gradient-main: linear-gradient(135deg, #FF7D6B 0%, #FF9F8A 50%, #FDCB6E 100%);
    --gradient-secondary: linear-gradient(135deg, #6C5CE7 0%, #8B7CF0 50%, #A78BFA 100%);
    --gradient-accent: linear-gradient(135deg, #FDCB6E 0%, #FFEAA7 100%);
    --gradient-hero: linear-gradient(160deg, #F4F6F9 0%, #FFF5F0 40%, #F0EFFF 100%);
}

/* ============================================
   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: linear-gradient(180deg, #F4F6F9 0%, #FFF5F0 50%, #F0EFFF 100%); 
}

.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-secondary-light), transparent);
    opacity: 0.3;
}

/* ============================================
   导航 — 固定顶部 (玻璃态)
   ============================================ */
.site-header { 
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100%; 
    z-index: 1000; 
    background: var(--color-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-glass-border);
    box-shadow: 0 1px 20px rgba(108, 92, 231, 0.04);
}

.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-text);
    letter-spacing: -0.3px;
    position: relative;
}

.logo::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 40%;
    height: 3px;
    background: var(--gradient-main);
    border-radius: 4px;
    opacity: 0.6;
}

.logo-icon { 
    width: 40px; 
    height: 40px; 
    border-radius: 12px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    font-size: 1.1rem;
    background: var(--gradient-main);
    color: white;
    box-shadow: 0 4px 16px rgba(255, 125, 107, 0.3);
}

.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; 
    transition: var(--transition); 
    color: var(--color-text-light);
    position: relative;
    padding: 4px 0;
}

.main-nav a::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-main);
    border-radius: 4px;
    transition: var(--transition);
}

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

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

.nav-cta { 
    padding: 10px 24px; 
    border-radius: 50px; 
    color: #fff !important; 
    font-weight: 600 !important; 
    background: var(--gradient-main);
    box-shadow: 0 4px 20px rgba(255, 125, 107, 0.25);
    transition: var(--transition) !important;
}

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

.nav-cta:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 30px rgba(255, 125, 107, 0.35);
    color: #fff !important;
}

.menu-toggle { 
    display: none; 
    width: 36px;
    height: 36px;
    border: none;
    background: var(--color-glass);
    border-radius: 10px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--color-text);
    transition: var(--transition);
    border: 1px solid var(--color-glass-border);
}

.menu-toggle:hover {
    background: rgba(255, 125, 107, 0.1);
}

/* ============================================
   首页Hero — 非对称层叠布局
   ============================================ */
.hero { 
    min-height: 85vh; 
    display: flex; 
    align-items: center; 
    position: relative;
    background: var(--gradient-hero);
    overflow: hidden;
    padding-top: 72px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(108, 92, 231, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 120px;
    background: linear-gradient(180deg, transparent, #F4F6F9);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content { 
    max-width: 640px; 
    position: relative;
}

.hero-content::before {
    content: '◆';
    position: absolute;
    top: -20px;
    left: -40px;
    font-size: 1.6rem;
    color: var(--color-secondary);
    opacity: 0.2;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-12px) rotate(10deg); }
}

.hero-eyebrow { 
    display: inline-block; 
    font-size: 0.8rem; 
    font-weight: 700; 
    padding: 6px 18px; 
    border-radius: 50px; 
    margin-bottom: 20px; 
    background: var(--gradient-secondary);
    color: white;
    letter-spacing: 2px;
    text-transform: uppercase;
    box-shadow: 0 4px 20px rgba(108, 92, 231, 0.2);
}

.hero h1 { 
    font-size: 3.2rem; 
    line-height: 1.15; 
    margin-bottom: 20px; 
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.5px;
}

.hero h1 span {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p { 
    font-size: 1.1rem; 
    opacity: 0.7; 
    max-width: 520px; 
    margin-bottom: 36px; 
    color: var(--color-text-light);
    line-height: 1.7;
}

.hero-buttons { 
    display: flex; 
    gap: 14px; 
}

.hero-image { 
    border-radius: var(--radius-lg); 
    overflow: hidden; 
    position: relative;
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-4deg) rotateX(2deg);
    transition: var(--transition);
}

.hero-image:hover {
    transform: perspective(1000px) rotateY(-2deg) rotateX(1deg) translateY(-4px);
    box-shadow: 0 60px 100px rgba(108, 92, 231, 0.15);
}

.hero-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,125,107,0.1), rgba(108,92,231,0.1));
    z-index: 1;
    pointer-events: none;
}

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

/* ============================================
   按钮系统
   ============================================ */
.btn { 
    display: inline-flex; 
    align-items: center; 
    gap: 10px; 
    padding: 14px 32px; 
    border-radius: 50px; 
    font-weight: 600; 
    cursor: pointer; 
    border: none; 
    text-decoration: none; 
    transition: var(--transition); 
    font-size: 0.95rem;
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: var(--transition);
}

.btn:hover::after {
    opacity: 1;
}

.btn-primary { 
    color: #fff; 
    background: var(--gradient-main);
    box-shadow: 0 4px 24px rgba(255, 125, 107, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(255, 125, 107, 0.4);
}

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

.btn-outline:hover {
    background: var(--color-secondary);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(108, 92, 231, 0.2);
}

/* ============================================
   标签 / 标题
   ============================================ */
.section-label { 
    display: inline-block; 
    font-size: 0.75rem; 
    font-weight: 700; 
    letter-spacing: 3px; 
    margin-bottom: 14px; 
    text-transform: uppercase;
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    padding-left: 40px;
}

.section-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 28px;
    height: 2px;
    background: var(--gradient-secondary);
    transform: translateY(-50%);
}

.section-title { 
    font-size: 2.4rem; 
    margin-bottom: 16px; 
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.3px;
    line-height: 1.2;
}

.section-desc { 
    max-width: 600px; 
    opacity: 0.7; 
    margin-bottom: 48px; 
    color: var(--color-text-light);
    font-size: 1.05rem;
    line-height: 1.7;
}

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

/* ============================================
   卡片网格 — 玻璃态卡片
   ============================================ */
.cards-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); 
    gap: 28px; 
}

.category-card { 
    border-radius: var(--radius-md); 
    padding: 32px; 
    background: var(--color-white);
    border: 1px solid var(--color-border);
    transition: var(--transition); 
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-main);
    opacity: 0;
    transition: var(--transition);
}

.category-card:hover::before {
    opacity: 1;
}

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

.card-icon { 
    width: 52px; 
    height: 52px; 
    border-radius: 14px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    margin-bottom: 18px; 
    font-size: 1.4rem;
    background: linear-gradient(135deg, rgba(255,125,107,0.1), rgba(108,92,231,0.1));
    color: var(--color-primary);
    transition: var(--transition);
}

.category-card:hover .card-icon {
    background: var(--gradient-main);
    color: white;
    transform: scale(1.05) rotate(-3deg);
}

.category-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--color-text);
}

.category-card p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    opacity: 0.8;
    line-height: 1.6;
    margin-bottom: 16px;
}

.card-link { 
    font-weight: 600; 
    font-size: 0.85rem; 
    text-decoration: none; 
    color: var(--color-secondary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

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

/* ============================================
   特性块 — 非对称网格
   ============================================ */
.feature-block { 
    display: grid; 
    grid-template-columns: 1fr 1fr; 
    gap: 64px; 
    align-items: center; 
}

.feature-block:nth-child(even) .feature-image {
    order: 2;
}

.feature-block:nth-child(even) .feature-text {
    order: 1;
}

.feature-image { 
    border-radius: var(--radius-lg); 
    overflow: hidden; 
    position: relative;
    box-shadow: var(--shadow-lg);
    aspect-ratio: 4/3;
}

.feature-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,125,107,0.08), rgba(108,92,231,0.08));
    pointer-events: none;
}

.feature-image img { 
    width: 100%; 
    height: 100%; 
    object-fit: cover;
    transition: var(--transition);
}

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

.feature-text { 
    padding: 20px 0;
}

.feature-text h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--color-text);
}

.feature-text p {
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 20px;
}

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

.feature-list li { 
    padding: 8px 0; 
    display: flex; 
    align-items: center; 
    gap: 12px; 
    font-size: 0.95rem;
    color: var(--color-text);
}

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

/* ============================================
   数据条 — 玻璃统计卡片
   ============================================ */
.stats-bar { 
    display: grid; 
    grid-template-columns: repeat(4, 1fr); 
    gap: 28px; 
    text-align: center; 
}

.stat-item { 
    padding: 32px 24px; 
    border-radius: var(--radius-md); 
    background: var(--color-white);
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20%;
    right: 20%;
    height: 3px;
    background: var(--gradient-main);
    border-radius: 4px;
    opacity: 0;
    transition: var(--transition);
}

.stat-item:hover::before {
    opacity: 1;
    left: 10%;
    right: 10%;
}

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

.stat-number { 
    font-size: 2.6rem; 
    font-weight: 800; 
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label { 
    font-size: 0.9rem; 
    opacity: 0.6; 
    margin-top: 8px; 
    color: var(--color-text-light);
    font-weight: 500;
}

/* ============================================
   内容墙 — 杂志风格网格
   ============================================ */
.content-wall { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); 
    gap: 28px; 
}

.content-wall-item { 
    border-radius: var(--radius-md); 
    overflow: hidden; 
    background: var(--color-white);
    border: 1px solid var(--color-border);
    transition: var(--transition); 
}

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

.content-wall-item img { 
    width: 100%; 
    height: 220px; 
    object-fit: cover; 
    transition: var(--transition);
}

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

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

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

.content-wall-body p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    opacity: 0.8;
    line-height: 1.6;
    margin-bottom: 12px;
}

.content-wall-body .card-link {
    margin-top: auto;
}

/* ============================================
   FAQ — 创意手风琴
   ============================================ */
.faq-list { 
    max-width: 800px; 
    margin: 0 auto; 
}

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

.faq-item:hover {
    border-color: var(--color-secondary-light);
}

.faq-item .faq-question { 
    padding: 20px 24px; 
    font-weight: 600; 
    display: flex; 
    justify-content: space-between; 
    align-items: center;
    color: var(--color-text);
    font-size: 1rem;
    transition: var(--transition);
}

.faq-item .faq-question::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 300;
    color: var(--color-secondary);
    transition: var(--transition);
}

.faq-item.open .faq-question::after {
    content: '−';
    transform: rotate(180deg);
}

.faq-item.open .faq-question {
    color: var(--color-primary);
}

.faq-item .faq-answer { 
    padding: 0 24px 20px; 
    display: none; 
    opacity: 0.8; 
    color: var(--color-text-light);
    line-height: 1.7;
    font-size: 0.95rem;
}

.faq-item.open .faq-answer { 
    display: block; 
    animation: fadeSlideUp 0.4s ease;
}

@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 0.8;
        transform: translateY(0);
    }
}

/* ============================================
   CTA横幅 — 渐变玻璃
   ============================================ */
.cta-banner { 
    padding: 72px 48px; 
    text-align: center; 
    border-radius: var(--radius-xl); 
    background: var(--gradient-secondary);
    color: #fff; 
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(108, 92, 231, 0.2);
}

.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(255,125,107,0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.cta-banner h2 { 
    color: #fff; 
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.3px;
    position: relative;
    z-index: 1;
}

.cta-banner p {
    color: rgba(255,255,255,0.85);
    font-size: 1.05rem;
    max-width: 540px;
    margin: 0 auto 28px;
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary { 
    background: #fff; 
    color: var(--color-secondary) !important;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 50px rgba(0,0,0,0.15);
}

/* ============================================
   页脚 — 渐变分割
   ============================================ */
.site-footer { 
    padding: 72px 0 32px; 
    background: linear-gradient(180deg, #F4F6F9 0%, #EDE9F7 100%);
    border-top: 1px solid var(--color-border);
}

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

.footer-brand { 
    padding-right: 20px;
}

.footer-brand .logo {
    margin-bottom: 14px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    opacity: 0.7;
    line-height: 1.7;
}

.footer-col h5 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 18px;
    color: var(--color-text);
    position: relative;
    padding-bottom: 10px;
}

.footer-col h5::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--gradient-main);
}

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

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

.footer-col ul a {
    text-decoration: none;
    color: var(--color-text-light);
    font-size: 0.9rem;
    transition: var(--transition);
    opacity: 0.75;
}

.footer-col ul a:hover {
    color: var(--color-primary);
    opacity: 1;
    padding-left: 4px;
}

.footer-bottom { 
    border-top: 1px solid var(--color-border);
    margin-top: 48px; 
    padding-top: 24px; 
    text-align: center; 
    font-size: 0.85rem; 
    color: var(--color-text-lighter);
}

.footer-bottom a {
    color: var(--color-secondary);
    text-decoration: none;
}

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

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

.seo-description { 
    max-width: 600px; 
    margin: 0 auto 48px; 
    opacity: 0.7; 
    color: var(--color-text-light);
    line-height: 1.7;
}

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

/* ============================================
   装饰性几何元素（全球）
   ============================================ */
.section .container {
    position: relative;
}

.section:nth-child(odd) .container::before {
    content: '◈';
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 2rem;
    color: var(--color-accent);
    opacity: 0.1;
    pointer-events: none;
}

.section:nth-child(even) .container::after {
    content: '◇';
    position: absolute;
    bottom: 20px;
    left: 20px;
    font-size: 2.4rem;
    color: var(--color-secondary);
    opacity: 0.08;
    pointer-events: none;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.6rem;
    }
    .hero .container {
        gap: 32px;
    }
    .hero-image {
        transform: none;
    }
    .hero-image:hover {
        transform: translateY(-4px);
    }
    .section-title {
        font-size: 2rem;
    }
    .feature-block {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding: 100px 0 60px;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .hero-content::before {
        display: none;
    }

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

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

    .hero-image {
        max-width: 90%;
        margin: 0 auto;
        transform: none;
    }

    .hero-image:hover {
        transform: translateY(-4px);
    }

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

    .feature-block:nth-child(even) .feature-image {
        order: 1;
    }

    .feature-block:nth-child(even) .feature-text {
        order: 2;
    }

    .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; 
    }

    .main-nav.open { 
        display: flex; 
        flex-direction: column; 
        position: absolute; 
        top: 72px; 
        left: 0; 
        width: 100%; 
        background: var(--color-glass);
        backdrop-filter: blur(20px);
        padding: 24px 28px; 
        gap: 18px;
        border-bottom: 1px solid var(--color-glass-border);
        box-shadow: var(--shadow-lg);
    }

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

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

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.7rem;
    }

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

    .cta-banner h2 {
        font-size: 1.6rem;
    }

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

@media (max-width: 480px) {
    .cards-grid,
    .content-wall,
    .stats-bar { 
        grid-template-columns: 1fr; 
    }

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

    .hero-buttons { 
        flex-direction: column;
        gap: 12px;
    }

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

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

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

    .section-label {
        font-size: 0.7rem;
        padding-left: 32px;
    }

    .section-label::before {
        width: 20px;
    }

    .container {
        padding: 0 16px;
    }

    .category-card {
        padding: 24px;
    }

    .content-wall-item img {
        height: 180px;
    }

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

    .stat-number {
        font-size: 1.8rem;
    }

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

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

    .header-inner {
        padding: 0 16px;
    }

    .logo {
        font-size: 1rem;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }
}

/* ============================================
   微交互与动画
   ============================================ */
@media (prefers-reduced-motion: no-preference) {
    .category-card,
    .content-wall-item,
    .stat-item,
    .faq-item {
        transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
                    box-shadow 0.4s cubic-bezier(0.22, 1, 0.36, 1),
                    border-color 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    }

    .hero-image {
        transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1),
                    box-shadow 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    }
}

/* 滚动入场微提示 */
@media (prefers-reduced-motion: no-preference) {
    .section .container > * {
        animation: fadeInUp 0.6s ease both;
    }
}

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

/* ============================================
   选中文本样式（品牌色）
   ============================================ */
::selection {
    background: rgba(255, 125, 107, 0.25);
    color: var(--color-text);
}

::-moz-selection {
    background: rgba(255, 125, 107, 0.25);
    color: var(--color-text);
}

/* ============================================
   滚动条（优雅风格）
   ============================================ */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-primary-light), var(--color-secondary-light));
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
}