*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
body { font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif; overflow-x:hidden; background:#f0f7fb; }

/* 核心布局 */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:80px 0; position:relative; }
.section:nth-child(even) { background:linear-gradient(135deg, #e8f4f8 0%, #f0fafd 100%); }

/* 导航 — 清新毛玻璃 */
.site-header { position:fixed; top:0; left:0; width:100%; z-index:1000; background:rgba(240,247,251,0.92); backdrop-filter:blur(14px) saturate(1.2); border-bottom:1px solid rgba(100,180,200,0.2); }
.header-inner { display:flex; align-items:center; justify-content:space-between; height:68px; 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:#1a5a6e; letter-spacing:-0.3px; }
.logo-icon { width:38px; height:38px; border-radius:12px; display:flex; align-items:center; justify-content:center; font-size:1.2rem; background:linear-gradient(135deg, #4fc3f7, #29b6f6); color:#fff; box-shadow:0 4px 12px rgba(79,195,247,0.35); }
.main-nav { display:flex; align-items:center; gap:28px; list-style:none; }
.main-nav a { text-decoration:none; font-size:0.9rem; font-weight:500; color:#2c6f82; transition:0.25s; padding:6px 0; border-bottom:2px solid transparent; }
.main-nav a:hover { color:#0288d1; border-bottom-color:#4fc3f7; }
.nav-cta { padding:8px 22px; border-radius:30px; color:#fff!important; font-weight:600; background:linear-gradient(135deg, #4fc3f7, #0288d1); box-shadow:0 4px 14px rgba(79,195,247,0.3); border-bottom:none!important; }
.menu-toggle { display:none; width:40px; height:40px; border:none; background:rgba(79,195,247,0.12); border-radius:10px; cursor:pointer; position:relative; }
.menu-toggle::after { content:'☰'; font-size:1.4rem; color:#1a5a6e; }

/* 首页Hero — 波浪解构风 */
.hero { min-height:72vh; display:flex; align-items:center; position:relative; overflow:hidden; background:linear-gradient(160deg, #e3f2fd 0%, #b3e5fc 40%, #e1f5fe 100%); }
.hero::before { content:''; position:absolute; bottom:0; left:0; width:100%; height:120px; background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 120'%3E%3Cpath d='M0,60 C300,120 600,0 900,60 C1050,90 1150,60 1200,60 L1200,120 L0,120 Z' fill='%23f0f7fb'/%3E%3C/svg%3E") no-repeat bottom; background-size:cover; }
.hero-content { max-width:720px; position:relative; z-index:2; }
.hero-eyebrow { display:inline-block; font-size:0.8rem; font-weight:700; padding:6px 18px; border-radius:30px; margin-bottom:18px; background:rgba(255,255,255,0.6); color:#0288d1; border:1px solid rgba(79,195,247,0.3); letter-spacing:1px; }
.hero h1 { font-size:3rem; line-height:1.15; margin-bottom:18px; color:#0d3b4e; font-weight:800; letter-spacing:-0.5px; }
.hero h1 span { background:linear-gradient(135deg, #0288d1, #4fc3f7); -webkit-background-clip:text; -webkit-text-fill-color:transparent; }
.hero p { font-size:1.1rem; opacity:0.75; max-width:560px; margin-bottom:32px; color:#1a5a6e; line-height:1.6; }
.hero-buttons { display:flex; gap:14px; }
.hero-image { border-radius:20px; overflow:hidden; box-shadow:0 20px 50px rgba(2,136,209,0.15); }
.hero-image img { width:100%; height:auto; display:block; }

/* 按钮 — 圆润磁感 */
.btn { display:inline-flex; align-items:center; gap:10px; padding:14px 32px; border-radius:50px; font-weight:700; cursor:pointer; border:none; text-decoration:none; transition:0.3s; font-size:0.95rem; }
.btn-primary { color:#fff; background:linear-gradient(135deg, #4fc3f7, #0288d1); box-shadow:0 6px 20px rgba(79,195,247,0.3); }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 10px 30px rgba(79,195,247,0.4); }
.btn-outline { background:transparent; border:1.5px solid #4fc3f7; color:#0288d1; }
.btn-outline:hover { background:rgba(79,195,247,0.1); }

/* 标签/标题 */
.section-label { display:inline-block; font-size:0.75rem; font-weight:700; letter-spacing:3px; margin-bottom:12px; color:#4fc3f7; text-transform:uppercase; }
.section-title { font-size:2.2rem; margin-bottom:14px; color:#0d3b4e; font-weight:800; letter-spacing:-0.3px; }
.section-desc { max-width:600px; opacity:0.7; margin-bottom:40px; color:#2c6f82; line-height:1.7; }

/* 卡片网格 — 层叠卡片 */
.cards-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(270px,1fr)); gap:28px; }
.category-card { border-radius:16px; padding:32px 28px; border:1px solid rgba(79,195,247,0.15); background:#fff; transition:0.35s; position:relative; overflow:hidden; }
.category-card::after { content:''; position:absolute; top:0; left:0; width:100%; height:4px; background:linear-gradient(90deg, #4fc3f7, #0288d1); opacity:0; transition:0.35s; }
.category-card:hover { transform:translateY(-5px); box-shadow:0 12px 40px rgba(79,195,247,0.12); border-color:rgba(79,195,247,0.3); }
.category-card:hover::after { opacity:1; }
.card-icon { width:52px; height:52px; border-radius:14px; display:flex; align-items:center; justify-content:center; margin-bottom:18px; font-size:1.5rem; background:linear-gradient(135deg, #e3f2fd, #b3e5fc); color:#0288d1; }
.card-link { font-weight:600; font-size:0.85rem; text-decoration:none; color:#0288d1; display:inline-flex; align-items:center; gap:6px; margin-top:12px; }
.card-link::after { content:'→'; transition:0.2s; }
.card-link:hover::after { transform:translateX(4px); }

/* 特性块 — 左右分割 */
.feature-block { display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center; }
.feature-image { border-radius:20px; overflow:hidden; box-shadow:0 16px 40px rgba(2,136,209,0.1); }
.feature-image img { width:100%; height:auto; display:block; }
.feature-text { }
.feature-list { list-style:none; }
.feature-list li { padding:8px 0; display:flex; align-items:center; gap:10px; color:#2c6f82; }
.feature-list li::before { content:'⚡'; font-weight:700; color:#4fc3f7; font-size:1.1rem; }

/* 数据条 — 磁力数字 */
.stats-bar { display:grid; grid-template-columns:repeat(4,1fr); gap:28px; text-align:center; }
.stat-item { padding:28px 16px; border-radius:16px; border:1px solid rgba(79,195,247,0.12); background:#fff; transition:0.3s; }
.stat-item:hover { transform:scale(1.02); box-shadow:0 8px 24px rgba(79,195,247,0.08); }
.stat-number { font-size:2.4rem; font-weight:800; color:#0d3b4e; letter-spacing:-1px; }
.stat-number span { color:#4fc3f7; }
.stat-label { font-size:0.9rem; opacity:0.6; margin-top:6px; color:#2c6f82; }

/* 内容墙 — 磁力网格 */
.content-wall { display:grid; grid-template-columns:repeat(auto-fill,minmax(290px,1fr)); gap:28px; }
.content-wall-item { border-radius:16px; overflow:hidden; border:1px solid rgba(79,195,247,0.12); background:#fff; transition:0.35s; }
.content-wall-item:hover { transform:translateY(-4px); box-shadow:0 12px 40px rgba(79,195,247,0.1); }
.content-wall-item img { width:100%; height:210px; object-fit:cover; }
.content-wall-body { padding:24px; }
.content-wall-body h4 { color:#0d3b4e; margin-bottom:8px; }
.content-wall-body p { color:#2c6f82; opacity:0.7; font-size:0.9rem; line-height:1.5; }

/* FAQ — 清新折叠 */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item { border:1px solid rgba(79,195,247,0.15); border-radius:14px; margin-bottom:10px; overflow:hidden; cursor:pointer; background:#fff; transition:0.25s; }
.faq-item:hover { border-color:#4fc3f7; }
.faq-item .faq-question { padding:18px 24px; font-weight:700; display:flex; justify-content:space-between; color:#0d3b4e; font-size:1.05rem; }
.faq-item .faq-question::after { content:'+'; font-size:1.4rem; color:#4fc3f7; transition:0.3s; }
.faq-item.open .faq-question::after { content:'−'; transform:rotate(180deg); }
.faq-item .faq-answer { padding:0 24px 20px; display:none; opacity:0.75; color:#2c6f82; line-height:1.7; }
.faq-item.open .faq-answer { display:block; }

/* CTA横幅 — 磁力渐变 */
.cta-banner { padding:64px 24px; text-align:center; border-radius:20px; color:#fff; background:linear-gradient(135deg, #0288d1, #4fc3f7); box-shadow:0 20px 50px rgba(2,136,209,0.2); position:relative; overflow:hidden; }
.cta-banner::before { content:'⚡'; position:absolute; top:-30px; right:-20px; font-size:8rem; opacity:0.08; }
.cta-banner h2 { color:#fff; font-size:2rem; margin-bottom:16px; }
.cta-banner .btn-primary { background:#fff; color:#0288d1; box-shadow:0 6px 20px rgba(0,0,0,0.1); }
.cta-banner .btn-primary:hover { transform:translateY(-2px); box-shadow:0 10px 30px rgba(0,0,0,0.15); }

/* 页脚 — 浅色清新 */
.site-footer { padding:56px 0 28px; background:#e3f2fd; border-top:1px solid rgba(79,195,247,0.15); }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; }
.footer-brand { }
.footer-brand p { color:#2c6f82; opacity:0.7; font-size:0.9rem; line-height:1.6; }
.footer-col h5 { color:#0d3b4e; margin-bottom:16px; font-weight:700; }
.footer-col a { display:block; color:#2c6f82; text-decoration:none; padding:4px 0; font-size:0.9rem; opacity:0.7; transition:0.2s; }
.footer-col a:hover { opacity:1; color:#0288d1; }
.footer-bottom { border-top:1px solid rgba(79,195,247,0.15); margin-top:40px; padding-top:20px; text-align:center; font-size:0.85rem; color:#2c6f82; opacity:0.6; }

/* 工具类 */
.text-accent { color:#4fc3f7; }
.text-center { text-align:center; }
.seo-description { max-width:600px; margin:0 auto 48px; opacity:0.7; color:#2c6f82; line-height:1.7; }
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* 响应式 */
@media (max-width: 768px) {
  .feature-block { grid-template-columns:1fr; gap:40px; }
  .stats-bar { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; }
  .main-nav { display:none; }
  .menu-toggle { display:flex; }
  .main-nav.open { display:flex; flex-direction:column; position:absolute; top:68px; left:0; width:100%; background:rgba(240,247,251,0.98); padding:24px; gap:16px; box-shadow:0 10px 30px rgba(0,0,0,0.05); }
  .hero h1 { font-size:2.2rem; }
  .hero { min-height:60vh; }
}
@media (max-width: 480px) {
  .cards-grid,.content-wall,.stats-bar { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; }
  .hero-buttons { flex-direction:column; }
  .hero h1 { font-size:1.8rem; }
  .section-title { font-size:1.6rem; }
}