/* 基础重置 */
*, *::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:#f7f9fc; color:#1a2a3a; }

/* 核心布局 — 必须居中 */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:80px 0; }
.section:nth-child(even) { background:#eef3f8; }

/* 导航 — 固定顶部 */
.site-header { position:fixed; top:0; left:0; width:100%; z-index:1000; background:rgba(247,249,252,0.92); backdrop-filter:blur(12px); border-bottom:1px solid #d0dce8; }
.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:700; font-size:1.3rem; text-decoration:none; color:#1a2a3a; letter-spacing:1px; }
.logo-icon { width:40px; height:40px; border-radius:50%; background:linear-gradient(135deg, #6c9bc7, #a0c4e0); display:flex; align-items:center; justify-content:center; font-size:1.2rem; color:#fff; box-shadow:0 2px 8px rgba(108,155,199,0.3); }
.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:#3a4a5a; transition:0.2s; letter-spacing:0.5px; }
.main-nav a:hover { color:#6c9bc7; }
.nav-cta { padding:10px 24px; border-radius:30px; background:linear-gradient(135deg, #6c9bc7, #8bb3d6); color:#fff!important; font-weight:600; box-shadow:0 2px 8px rgba(108,155,199,0.2); }
.nav-cta:hover { transform:translateY(-1px); box-shadow:0 4px 14px rgba(108,155,199,0.35); }
.menu-toggle { display:none; }

/* 首页Hero */
.hero { min-height:80vh; display:flex; align-items:center; position:relative; background:linear-gradient(120deg, #e8f0f8 0%, #f7f9fc 50%, #e0ecf5 100%); }
.hero::before { content:''; position:absolute; top:-20%; right:-10%; width:500px; height:500px; background:radial-gradient(circle, rgba(160,196,224,0.15) 0%, transparent 70%); border-radius:50%; }
.hero-content { max-width:720px; position:relative; z-index:1; }
.hero-eyebrow { display:inline-block; font-size:0.8rem; font-weight:700; padding:6px 18px; border-radius:30px; background:rgba(108,155,199,0.12); color:#6c9bc7; margin-bottom:18px; letter-spacing:2px; text-transform:uppercase; }
.hero h1 { font-size:3.2rem; line-height:1.15; margin-bottom:20px; font-weight:800; color:#0f1e2e; letter-spacing:-0.5px; }
.hero h1 span { color:#6c9bc7; }
.hero p { font-size:1.15rem; opacity:0.65; max-width:560px; margin-bottom:36px; line-height:1.7; }
.hero-buttons { display:flex; gap:16px; }
.hero-image { border-radius:20px; overflow:hidden; box-shadow:0 12px 40px rgba(108,155,199,0.12); }
.hero-image img { width:100%; height:auto; display:block; }

/* 按钮 */
.btn { display:inline-flex; align-items:center; gap:8px; padding:14px 32px; border-radius:30px; font-weight:600; cursor:pointer; border:none; text-decoration:none; transition:0.25s; font-size:0.95rem; }
.btn-primary { background:linear-gradient(135deg, #6c9bc7, #8bb3d6); color:#fff; box-shadow:0 4px 14px rgba(108,155,199,0.25); }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 6px 20px rgba(108,155,199,0.35); }
.btn-outline { background:transparent; border:2px solid #6c9bc7; color:#6c9bc7; }
.btn-outline:hover { background:#6c9bc7; color:#fff; }

/* 标签/标题 */
.section-label { display:inline-block; font-size:0.75rem; font-weight:700; letter-spacing:3px; margin-bottom:14px; color:#6c9bc7; text-transform:uppercase; }
.section-title { font-size:2.2rem; margin-bottom:16px; font-weight:800; color:#0f1e2e; letter-spacing:-0.3px; }
.section-desc { max-width:600px; opacity:0.6; margin-bottom:44px; font-size:1.05rem; line-height:1.7; }

/* 卡片网格 */
.cards-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:28px; }
.category-card { border-radius:18px; padding:32px; background:#fff; border:1px solid #dce8f0; transition:0.25s; box-shadow:0 2px 8px rgba(108,155,199,0.04); }
.category-card:hover { transform:translateY(-4px); box-shadow:0 12px 32px rgba(108,155,199,0.10); border-color:#c0d4e4; }
.card-icon { width:52px; height:52px; border-radius:14px; background:linear-gradient(135deg, #e8f0f8, #d0dce8); display:flex; align-items:center; justify-content:center; margin-bottom:18px; font-size:1.5rem; color:#6c9bc7; }
.card-link { font-weight:600; font-size:0.85rem; text-decoration:none; color:#6c9bc7; display:inline-flex; align-items:center; gap:4px; }
.card-link::after { content:'→'; transition:0.2s; }
.card-link:hover::after { transform:translateX(4px); }

/* 特性块 */
.feature-block { display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center; }
.feature-image { border-radius:18px; overflow:hidden; box-shadow:0 8px 28px rgba(108,155,199,0.08); }
.feature-image img { width:100%; height:auto; display:block; }
.feature-text { }
.feature-list { list-style:none; margin-top:12px; }
.feature-list li { padding:8px 0; display:flex; align-items:center; gap:10px; font-size:0.95rem; }
.feature-list li::before { content:'✓'; font-weight:700; color:#6c9bc7; font-size:1.1rem; }

/* 数据条 */
.stats-bar { display:grid; grid-template-columns:repeat(4,1fr); gap:28px; text-align:center; }
.stat-item { padding:28px 16px; border-radius:16px; background:#fff; border:1px solid #dce8f0; transition:0.2s; }
.stat-item:hover { border-color:#c0d4e4; box-shadow:0 4px 16px rgba(108,155,199,0.06); }
.stat-number { font-size:2.6rem; font-weight:800; color:#0f1e2e; letter-spacing:-1px; }
.stat-label { font-size:0.9rem; opacity:0.55; margin-top:6px; letter-spacing:0.5px; }

/* 内容墙 */
.content-wall { display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:28px; }
.content-wall-item { border-radius:16px; overflow:hidden; background:#fff; border:1px solid #dce8f0; transition:0.25s; }
.content-wall-item:hover { transform:translateY(-4px); box-shadow:0 12px 32px rgba(108,155,199,0.10); }
.content-wall-item img { width:100%; height:200px; object-fit:cover; display:block; }
.content-wall-body { padding:22px; }
.content-wall-body h4 { font-size:1.05rem; margin-bottom:6px; }
.content-wall-body p { font-size:0.9rem; opacity:0.6; }

/* FAQ */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item { border:1px solid #dce8f0; border-radius:14px; margin-bottom:10px; overflow:hidden; cursor:pointer; background:#fff; transition:0.2s; }
.faq-item:hover { border-color:#c0d4e4; }
.faq-item .faq-question { padding:18px 24px; font-weight:600; display:flex; justify-content:space-between; align-items:center; color:#0f1e2e; font-size:1rem; }
.faq-item .faq-question::after { content:'+'; font-size:1.3rem; color:#6c9bc7; transition:0.2s; }
.faq-item.open .faq-question::after { content:'−'; }
.faq-item .faq-answer { padding:0 24px 18px; display:none; opacity:0.65; line-height:1.7; }
.faq-item.open .faq-answer { display:block; }

/* CTA横幅 */
.cta-banner { padding:64px 40px; text-align:center; border-radius:20px; background:linear-gradient(135deg, #6c9bc7, #a0c4e0); color:#fff; box-shadow:0 12px 40px rgba(108,155,199,0.2); }
.cta-banner h2 { color:#fff; font-size:2rem; margin-bottom:12px; }
.cta-banner p { opacity:0.85; margin-bottom:28px; font-size:1.05rem; }
.cta-banner .btn-primary { background:#fff; color:#6c9bc7; box-shadow:0 4px 14px rgba(0,0,0,0.08); }
.cta-banner .btn-primary:hover { transform:translateY(-2px); box-shadow:0 6px 20px rgba(0,0,0,0.12); }

/* 页脚 */
.site-footer { padding:60px 0 32px; background:#e8f0f8; border-top:1px solid #d0dce8; }
.site-footer .container { }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; }
.footer-brand { }
.footer-brand h3 { font-size:1.2rem; margin-bottom:8px; color:#0f1e2e; }
.footer-brand p { font-size:0.9rem; opacity:0.55; line-height:1.6; }
.footer-col { }
.footer-col h4 { font-size:0.85rem; font-weight:700; margin-bottom:12px; color:#0f1e2e; letter-spacing:1px; text-transform:uppercase; }
.footer-col ul { list-style:none; }
.footer-col ul li { margin-bottom:6px; }
.footer-col ul a { text-decoration:none; font-size:0.9rem; opacity:0.6; transition:0.2s; color:#1a2a3a; }
.footer-col ul a:hover { opacity:1; color:#6c9bc7; }
.footer-bottom { border-top:1px solid #d0dce8; margin-top:40px; padding-top:20px; text-align:center; font-size:0.85rem; opacity:0.5; }

/* 工具类 */
.text-accent { color:#6c9bc7; }
.text-center { text-align:center; }
.seo-description { max-width:600px; margin:0 auto 48px; opacity:0.6; font-size:1.05rem; 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:32px; }
  .stats-bar { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; }
  .main-nav { display:none; }
  .menu-toggle { display:flex; align-items:center; justify-content:center; width:40px; height:40px; border:none; background:none; cursor:pointer; font-size:1.5rem; color:#1a2a3a; }
  .main-nav.open { display:flex; flex-direction:column; position:absolute; top:72px; left:0; width:100%; background:#f7f9fc; padding:24px; gap:16px; border-bottom:1px solid #d0dce8; }
  .hero h1 { font-size:2.4rem; }
  .section-title { font-size:1.8rem; }
}
@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; }
  .hero h1 { font-size:2rem; }
  .cta-banner { padding:40px 24px; }
}