/* 核心变量 */
:root {
    --primary: #00a884;
    --primary-dark: #128C7E;
    --accent: #25D366;
    --dark: #0b141a;
    --text-main: #111b21;
    --text-sub: #667781;
    --bg-light: #f7f9fa;
    --glass: rgba(255, 255, 255, 0.85);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-main);
    background: var(--bg-light);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 渐变文字 */
.gradient-text {
    background: linear-gradient(90deg, var(--primary-dark), #25D366);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* 导航栏 */
.navbar {
    position: fixed; top: 0; width: 100%; height: 72px;
    background: var(--glass);
    backdrop-filter: blur(12px);
    z-index: 1000; border-bottom: 1px solid rgba(0,0,0,0.05);
    display: flex; align-items: center;
}
.navbar .container { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.logo { font-size: 22px; font-weight: 800; color: var(--primary-dark); display: flex; align-items: center; gap: 8px; }
.nav-links { display: flex; list-style: none; align-items: center; gap: 32px; }
.nav-links a { text-decoration: none; color: var(--text-main); font-weight: 500; font-size: 15px; transition: 0.3s; }
.nav-links a:hover { color: var(--primary); }
.nav-btn { background: var(--primary); color: white !important; padding: 10px 24px; border-radius: 50px; }

/* Hero 区 */
.hero { padding: 180px 0 100px; text-align: center; background: radial-gradient(circle at top right, #e8f5e9 0%, #f7f9fa 50%); }
.hero-tag { display: inline-block; padding: 6px 16px; background: rgba(0,168,132,0.1); color: var(--primary-dark); border-radius: 50px; font-weight: bold; font-size: 14px; margin-bottom: 24px; }
.hero-desc { font-size: 20px; color: var(--text-sub); max-width: 700px; margin: 0 auto 40px; }
.hero-btns { display: flex; justify-content: center; gap: 16px; margin-bottom: 48px; }

.btn-primary { background: var(--primary); color: white; padding: 18px 40px; border-radius: 50px; text-decoration: none; font-weight: bold; font-size: 18px; transition: 0.3s; box-shadow: 0 10px 30px rgba(0,168,132,0.3); }
.btn-outline { background: white; color: var(--text-main); padding: 18px 40px; border-radius: 50px; text-decoration: none; font-weight: bold; font-size: 18px; border: 1px solid #d1d7db; transition: 0.3s; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 15px 40px rgba(0,168,132,0.4); }

.trust-bar { margin-bottom: 60px; font-size: 15px; color: var(--text-sub); display: flex; align-items: center; justify-content: center; gap: 20px; }
.trust-bar i { font-size: 20px; color: #999; }

/* UI Mockup */
.hero-main-ui { max-width: 900px; margin: 0 auto; perspective: 1000px; }
.glass-card { 
    background: var(--white); border-radius: 16px; 
    box-shadow: 0 40px 100px rgba(0,0,0,0.15); 
    overflow: hidden; text-align: left;
    border: 1px solid rgba(255,255,255,0.5);
    transform: rotateX(5deg); transition: 0.5s;
}
.glass-card:hover { transform: rotateX(0deg); }

.ui-header { background: #f0f2f5; padding: 12px 20px; display: flex; align-items: center; gap: 15px; }
.dots { display: flex; gap: 6px; }
.dots span { width: 10px; height: 10px; border-radius: 50%; background: #ff5f56; }
.dots span:nth-child(2) { background: #ffbd2e; }
.dots span:nth-child(3) { background: #27c93f; }
.url-bar { background: white; flex: 1; padding: 4px 12px; border-radius: 4px; font-size: 12px; color: #999; }

/* 步骤与图片展示 */
.how-it-works { padding: 100px 0; background: white; }
.step-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 50px; }
.step-card { background: var(--bg-light); padding: 40px 30px; border-radius: 24px; position: relative; text-align: center; }
.step-num { position: absolute; top: -20px; left: 30px; font-size: 48px; font-weight: 900; color: rgba(0,168,132,0.15); }
.step-card h4 { font-size: 20px; margin-bottom: 15px; }
.step-card p { font-size: 14px; color: var(--text-sub); margin-bottom: 25px; min-height: 44px; }
.img-wrap { border-radius: 12px; overflow: hidden; box-shadow: 0 10px 30px rgba(0,0,0,0.1); background: white; }
.img-wrap img { width: 100%; display: block; }

.full-demo { padding: 100px 0; background: #fff; }
.demo-box { 
    display: flex; align-items: center; gap: 60px; 
    background: #f8f9fa; padding: 60px; border-radius: 30px;
    border: 1px solid #eee;
}
.demo-text { flex: 1; }
.demo-text h3 { font-size: 32px; margin-bottom: 20px; }
.demo-text p { font-size: 18px; color: var(--text-sub); margin-bottom: 30px; }
.check-list { list-style: none; }
.check-list li { margin-bottom: 15px; font-weight: 600; display: flex; align-items: center; gap: 10px; }
.check-list i { color: var(--primary); }
.demo-img { flex: 1.2; }
.demo-img img { width: 100%; border-radius: 16px; box-shadow: 0 30px 60px rgba(0,0,0,0.12); }

/* 痛点板块 */
.pain-points { padding: 100px 0; background: #fff; }
.pain-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 50px; }
.pain-item { 
    display: flex; align-items: center; gap: 20px; 
    padding: 30px; background: #fff5f5; border-radius: 16px;
    border-left: 5px solid #ff5252; transition: 0.3s;
}
.pain-item:hover { transform: scale(1.02); box-shadow: 0 10px 30px rgba(255,82,82,0.1); }
.pain-item i { font-size: 24px; color: #ff5252; }
.pain-item p { font-size: 16px; font-weight: 600; color: #333; }

/* 升级版功能卡片 */
.card-icon { 
    width: 50px; height: 50px; border-radius: 12px; 
    display: flex; align-items: center; justify-content: center; 
    font-size: 20px; font-weight: 900; margin-bottom: 25px; 
}
.purple { background: #f3e5f5; color: #7b1fa2; }
.cyan { background: #e0f7fa; color: #0097a7; }
.red { background: #ffebee; color: #c62828; }

/* 页脚排版升级 */
.site-footer { 
    background: #0b141a; color: #fff; padding: 100px 0 40px; 
    border-top: 1px solid rgba(255,255,255,0.05);
}
.footer-main { display: grid; grid-template-columns: 1.5fr 1fr 1.2fr; gap: 80px; margin-bottom: 80px; }

.footer-brand h3 { font-size: 28px; margin-bottom: 25px; color: var(--primary); font-weight: 800; }
.footer-brand p { color: #8696a0; line-height: 2; font-size: 16px; max-width: 360px; }

.footer-nav h4, .footer-contact h4 { 
    font-size: 18px; margin-bottom: 30px; color: #fff; 
    position: relative; padding-bottom: 12px;
}
.footer-nav h4::after, .footer-contact h4::after {
    content: ''; position: absolute; bottom: 0; left: 0; 
    width: 30px; height: 2px; background: var(--primary);
}

.footer-nav ul { list-style: none; }
.footer-nav li { margin-bottom: 15px; }
.footer-nav a { color: #8696a0; text-decoration: none; transition: 0.3s; font-size: 15px; }
.footer-nav a:hover { color: var(--primary); padding-left: 5px; }

.footer-contact { background: rgba(255,255,255,0.03); padding: 30px; border-radius: 20px; border: 1px solid rgba(255,255,255,0.05); }
.contact-item { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; color: #e9edef; font-size: 16px; }
.contact-item i { color: var(--primary); font-size: 20px; }
.contact-item strong { font-size: 20px; color: var(--primary); letter-spacing: 1px; }
.contact-tip { font-size: 13px; color: #667781; opacity: 0.8; }

.footer-bottom { 
    padding-top: 40px; border-top: 1px solid rgba(255,255,255,0.05); 
    display: flex; justify-content: space-between; align-items: center;
    color: #667781; font-size: 14px;
}
.footer-tags { display: flex; gap: 25px; }
.footer-tags span { display: flex; align-items: center; gap: 8px; color: #8696a0; }

@media (max-width: 992px) {
    .footer-main { grid-template-columns: 1fr; gap: 50px; }
    .footer-bottom { flex-direction: column; gap: 25px; text-align: center; }
}

.main-demo-img { width: 100%; display: block; }
.img-caption { padding: 10px; background: #f0f2f5; font-size: 12px; font-weight: bold; color: var(--primary-dark); text-align: center; }

/* FAQ 板块升级 */
.faq { padding: 100px 0; background: #f0f2f5; }
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; margin-top: 40px; }
.faq-card { 
    background: white; padding: 32px; border-radius: 20px; 
    box-shadow: 0 4px 15px rgba(0,0,0,0.03); 
    transition: 0.3s; border: 1px solid rgba(0,0,0,0.05);
}
.faq-card:hover { transform: translateY(-5px); box-shadow: 0 15px 40px rgba(0,0,0,0.08); }

.faq-q { display: flex; align-items: flex-start; gap: 15px; margin-bottom: 15px; }
.faq-q i { font-size: 20px; color: var(--primary); margin-top: 3px; }
.faq-q h4 { font-size: 18px; color: var(--dark); font-weight: 700; line-height: 1.4; }

.faq-a { padding-left: 35px; border-left: 2px solid #eee; margin-top: 10px; }
.faq-a p { color: var(--text-sub); font-size: 15px; line-height: 1.6; }

@media (max-width: 768px) {
    .faq-grid { grid-template-columns: 1fr; }
}

.ui-body { padding: 30px; background: #e5ddd5; min-height: 300px; }
.chat-bubble { padding: 15px; border-radius: 10px; margin-bottom: 24px; position: relative; max-width: 85%; }
.received { background: white; align-self: flex-start; }
.sent { background: #dcf8c6; margin-left: auto; }
.tr-tag { font-size: 12px; color: var(--primary); font-weight: bold; display: block; margin-bottom: 5px; }
.tr-content { font-weight: 700; color: #000; font-size: 15px; border-top: 1px dashed #ddd; padding-top: 5px; margin-top: 5px; }
.tr-sent { font-style: italic; color: #667; margin-top: 5px; font-size: 13px; }
.quick-tags { display: flex; gap: 8px; margin-bottom: 10px; }
.quick-tags span { background: white; padding: 4px 10px; border-radius: 50px; font-size: 11px; color: var(--primary-dark); font-weight: bold; border: 1px solid #dcf8c6; }
.status-tip { position: absolute; bottom: -20px; right: 0; font-size: 11px; color: #2e7d32; font-weight: bold; }

/* 统计区 */
.stats { padding: 60px 0; background: var(--dark); color: white; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); text-align: center; }
.stat-item h3 { font-size: 42px; color: var(--accent); margin-bottom: 8px; }
.stat-item p { opacity: 0.7; font-size: 14px; }

/* 功能卡片 */
.features-detailed { padding: 100px 0; }
.section-head { text-align: center; margin-bottom: 80px; }
.section-head h2 { font-size: 40px; margin-bottom: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.card { background: white; padding: 48px; border-radius: 24px; transition: 0.3s; border: 1px solid #eee; }
.card:hover { transform: translateY(-10px); box-shadow: 0 20px 50px rgba(0,0,0,0.08); }
.card-icon { width: 64px; height: 64px; border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 24px; margin-bottom: 24px; }
.blue { background: #e3f2fd; color: #1976d2; }
.green { background: #e8f5e9; color: #2e7d32; }
.gold { background: #fff8e1; color: #fbc02d; }

/* 对比表格 */
.comparison { padding: 100px 0; background: white; }
.table-container { background: #f8f9fa; border-radius: 20px; overflow: hidden; margin-top: 50px; }
table { width: 100%; border-collapse: collapse; }
th { background: #edf2f4; padding: 24px; text-align: left; font-size: 18px; }
td { padding: 24px; border-bottom: 1px solid #eee; }
.highlight { color: var(--primary); font-weight: 800; background: rgba(0,168,132,0.03); }

/* 应用场景 */
.scenarios { padding: 100px 0; }
.scenario-flex { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.scen-card { background: white; border-radius: 20px; overflow: hidden; box-shadow: 0 4px 20px rgba(0,0,0,0.05); }
.scen-card img { width: 100%; height: 220px; object-fit: cover; }
.scen-card h4 { padding: 24px 24px 8px; font-size: 20px; }
.scen-card p { padding: 0 24px 24px; color: var(--text-sub); font-size: 14px; }

/* 购买板块 */
.buy-section { padding: 100px 0; background: linear-gradient(135deg, var(--dark) 0%, #1a2a33 100%); color: white; }
.buy-box { text-align: center; max-width: 800px; margin: 0 auto; background: rgba(255,255,255,0.05); padding: 60px; border-radius: 30px; backdrop-filter: blur(20px); border: 1px solid rgba(255,255,255,0.1); }
.price-tag { margin: 40px 0; }
.old-price { font-size: 24px; text-decoration: line-through; opacity: 0.5; margin-right: 15px; }
.new-price { font-size: 64px; font-weight: 900; color: var(--accent); }
.unit { font-size: 20px; opacity: 0.8; }
.btn-buy { 
    display: inline-block; padding: 20px 60px; background: var(--accent); color: var(--dark); 
    text-decoration: none; font-weight: 900; font-size: 24px; border-radius: 50px; 
    transition: 0.3s;
}
.secure-icons { margin-top: 30px; display: flex; justify-content: center; gap: 30px; opacity: 0.6; }

/* 页脚 */
footer { padding: 80px 0 40px; background: #070d11; color: #8696a0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 100px; padding-bottom: 60px; }
.footer-links h4 { color: white; margin-bottom: 20px; }
.footer-links a { display: block; color: #8696a0; text-decoration: none; margin-bottom: 12px; }



.main-demo-img { width: 100%; display: block; border-radius: 12px; }

/* 专供 SEO 抓取的安全 H1 样式 (爬虫可见，视觉隐藏以防破坏排版) */
.hero-h1-seo { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.hero-main-title { font-size: 64px; line-height: 1.1; margin-bottom: 24px; font-weight: 900; }

/* 竞品对比表 (喂给 AI 提取) */
.comparison { padding: 100px 0; background: #f8f9fa; }
.table-container { background: white; border-radius: 20px; box-shadow: 0 20px 50px rgba(0,0,0,0.05); overflow: hidden; margin-top: 40px; }
.seo-table { width: 100%; border-collapse: collapse; text-align: left; }
.seo-table th { background: #0b141a; color: white; padding: 20px 30px; font-size: 18px; }
.seo-table td { padding: 20px 30px; border-bottom: 1px solid #eee; color: #667781; }
.seo-table tr:last-child td { border-bottom: none; }
.seo-table .highlight { background: rgba(0,168,132,0.05); color: var(--primary-dark); font-weight: bold; }
.seo-table th.highlight { background: var(--primary); color: white; }

/* 真实评价区 (支撑 Schema 5.0) */
.testimonials { padding: 100px 0; background: white; }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 50px; }
.review-card { background: #f8f9fa; padding: 40px 30px; border-radius: 20px; border: 1px solid #eee; transition: 0.3s; }
.review-card:hover { transform: translateY(-5px); box-shadow: 0 15px 40px rgba(0,0,0,0.08); }
.stars { color: #fbc02d; margin-bottom: 20px; font-size: 18px; }
.review-card p { font-size: 15px; color: #333; line-height: 1.8; margin-bottom: 20px; font-style: italic; }
.review-card span { display: block; font-size: 14px; color: #8696a0; font-weight: bold; }

/* 移动端适配深度优化 (必须放在文件最末尾以覆盖所有层叠样式) */
@media (max-width: 992px) {
    .grid-3, .stat-grid, .scenario-flex, .pain-grid, .review-grid, .step-grid, .faq-grid { grid-template-columns: 1fr; }
    .footer-grid, .footer-main { grid-template-columns: 1fr; gap: 40px; }
    .hero-main-title { font-size: 42px; }
    .hero-main-ui { padding: 0 10px; }
    .demo-box { flex-direction: column; padding: 30px; text-align: center; }
    .footer-bottom { flex-direction: column; gap: 20px; text-align: center; }
    .table-container { overflow-x: auto; }
}

@media (max-width: 768px) {
    .navbar { height: 60px; }
    .navbar .container { padding: 0 15px; }
    .nav-links { display: none; }
    .logo { font-size: 16px; gap: 5px; }
    .logo small { display: none; }
    .nav-btn { display: block !important; padding: 6px 15px; font-size: 13px; }
    
    .hero { padding: 120px 0 60px; }
    .hero-main-title { font-size: 34px; line-height: 1.2; }
    .hero-h1-seo { font-size: 12px; }
    .hero-desc { font-size: 16px; padding: 0 15px; }
    .hero-btns { flex-direction: column; padding: 0 20px; }
    .btn-primary, .btn-outline { width: 100%; text-align: center; }
    
    .section-head h2 { font-size: 28px; }
    .card { padding: 30px; }
    .pain-item { padding: 20px; }
    .step-card { padding: 20px; }
    .review-card { padding: 20px; }
    
    .buy-box { padding: 40px 20px; }
    .new-price { font-size: 48px; }
    .btn-buy { width: 100%; padding: 15px; font-size: 20px; }
}