/* ===== 基础 ===== */
:root {
  --bg: #0D1117;
  --bg-2: #11161F;
  --card: #1A1F2E;
  --card-2: #222A3A;
  --accent: #00D4AA;
  --blue: #3B82F6;
  --purple: #8B5CF6;
  --amber: #F59E0B;
  --white: #F8FAFC;
  --gray: #94A3B8;
  --line: rgba(255, 255, 255, 0.08);
  --radius: 16px;
  --maxw: 1180px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--white);
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section-alt { background: var(--bg-2); }
h2 { font-size: 36px; line-height: 1.25; margin-bottom: 16px; font-weight: 700; letter-spacing: -0.5px; }
h3 { font-size: 19px; margin-bottom: 10px; font-weight: 600; }
p { color: var(--gray); }
.eyebrow { display: inline-block; color: var(--accent); font-size: 14px; font-weight: 600; letter-spacing: 1px; margin-bottom: 12px; text-transform: uppercase; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 26px; border-radius: 10px; font-size: 15px; font-weight: 600;
  cursor: pointer; transition: all .25s ease; border: 1px solid transparent; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #04231C; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(0, 212, 170, .35); }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--white); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-console { background: linear-gradient(135deg, var(--accent), #22d3ee); color: #04231C; padding: 9px 20px; }
.btn-console:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(0, 212, 170, .35); }
.btn-lg { padding: 16px 40px; font-size: 17px; }
.btn-block { width: 100%; }

/* ===== 导航 ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(13, 17, 23, .72); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line); transition: all .3s ease;
}
.nav.scrolled { background: rgba(13, 17, 23, .92); }
.nav-inner { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; height: 64px; display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 19px; }
.logo-mark {
  width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), #22d3ee); color: #04231C; font-weight: 800; font-size: 18px;
}
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { font-size: 15px; color: var(--gray); transition: color .2s; }
.nav-links a:hover { color: var(--white); }
.nav-links a.active { color: var(--accent); }
.nav-links .btn-console { color: #04231C; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--white); border-radius: 2px; transition: .3s; }

/* ===== Hero ===== */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; object-position: right center; opacity: .55; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, var(--bg) 35%, rgba(13,17,23,.4) 100%); }
.hero-content { position: relative; z-index: 2; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.badge { display: inline-block; padding: 7px 16px; border: 1px solid var(--accent); border-radius: 999px; color: var(--accent); font-size: 13px; font-weight: 600; margin-bottom: 24px; }
.badge::before { content: "●"; margin-right: 8px; font-size: 10px; }
.hero-title { font-size: 84px; font-weight: 800; letter-spacing: -2px; line-height: 1; background: linear-gradient(135deg, #fff 40%, var(--accent)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-sub { font-size: 26px; color: var(--accent); font-weight: 600; margin: 18px 0 14px; }
.hero-desc { font-size: 17px; color: var(--gray); max-width: 560px; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ===== 数据条 ===== */
.stats { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 48px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; text-align: center; }
.stat-num { font-size: 42px; font-weight: 800; color: var(--accent); line-height: 1; }
.stat-label { font-size: 14px; color: var(--gray); margin-top: 8px; }

/* ===== 关于我们 ===== */
.about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.about-text h2 { margin-top: 4px; }
.about-text p { margin-bottom: 16px; }
.about-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.about-tags span { padding: 7px 15px; background: var(--card); border: 1px solid var(--line); border-radius: 999px; font-size: 13px; color: var(--gray); }
.about-image img { border-radius: var(--radius); border: 1px solid var(--line); box-shadow: 0 20px 60px rgba(0,0,0,.4); }

/* ===== Section head ===== */
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head p { font-size: 16px; }

/* ===== 卡片网格 ===== */
.cards-grid { display: grid; gap: 24px; }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px; transition: transform .25s, border-color .25s, box-shadow .25s; position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: 0 16px 40px rgba(0,0,0,.35); }
.card-icon { font-size: 30px; width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center; background: rgba(0,212,170,.12); margin-bottom: 18px; }
.card h3 { color: var(--white); }
.card p { font-size: 14.5px; }
.card-bar { position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--accent); }
.card:nth-child(even) .card-bar { background: var(--blue); }

/* ===== 产品功能 ===== */
.product-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.product-image { position: relative; }
.product-image img { border-radius: var(--radius); border: 1px solid var(--accent); box-shadow: 0 20px 60px rgba(0,0,0,.4); }
.product-badge { position: absolute; top: 16px; left: 16px; background: rgba(13,17,23,.7); backdrop-filter: blur(6px); padding: 8px 16px; border-radius: 8px; font-weight: 600; font-size: 14px; border: 1px solid var(--line); }
.feature-list { list-style: none; margin: 8px 0 26px; }
.feature-list li { padding: 12px 0 12px 28px; border-bottom: 1px solid var(--line); position: relative; font-size: 15px; color: var(--gray); }
.feature-list li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.feature-list strong { color: var(--white); }

/* ===== 技术架构 ===== */
.arch { max-width: 760px; margin: 0 auto; }
.arch-layer { display: flex; align-items: center; gap: 20px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px 22px; }
.arch-tag { padding: 8px 18px; border-radius: 8px; font-weight: 700; font-size: 15px; color: #04231C; min-width: 110px; text-align: center; }
.arch-tag.accent { background: var(--accent); }
.arch-tag.blue { background: var(--blue); color: #fff; }
.arch-tag.purple { background: var(--purple); color: #fff; }
.arch-tag.amber { background: var(--amber); }
.arch-desc { color: var(--gray); font-size: 15px; }
.arch-arrow { text-align: center; color: var(--gray); font-size: 14px; margin: 6px 0; }
.arch-foot { text-align: center; margin-top: 36px; }
.arch-foot img { max-width: 460px; margin: 0 auto; border-radius: 12px; border: 1px solid var(--line); opacity: .9; }

/* ===== 全国布局 ===== */
.coverage-banner { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--accent); box-shadow: 0 20px 60px rgba(0,0,0,.4); }
.coverage-banner img { width: 100%; height: 360px; object-fit: cover; }
.city-chips { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 28px; }
.chip { padding: 12px 36px; background: var(--card); border: 1px solid var(--accent); border-radius: 12px; font-weight: 600; font-size: 17px; }

/* ===== 核心优势 ===== */
.adv-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; max-width: 920px; margin: 0 auto; }
.adv-item { display: flex; gap: 18px; align-items: flex-start; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 26px; transition: border-color .25s; }
.adv-item:hover { border-color: var(--accent); }
.adv-num { flex: none; width: 42px; height: 42px; border-radius: 11px; background: var(--accent); color: #04231C; font-weight: 800; font-size: 18px; display: grid; place-items: center; }
.adv-item h3 { margin-bottom: 6px; }
.adv-item p { font-size: 14.5px; }

/* ===== 定价 ===== */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 960px; margin: 0 auto; align-items: start; }
.price-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 34px 28px; text-align: center; position: relative; }
.price-card.hot { border-color: var(--accent); box-shadow: 0 20px 50px rgba(0,212,170,.18); transform: scale(1.04); }
.hot-tag { position: absolute; top: 16px; right: 16px; background: var(--accent); color: #04231C; font-size: 12px; font-weight: 700; padding: 5px 12px; border-radius: 999px; }
.price-card h3 { font-size: 20px; }
.price { font-size: 46px; font-weight: 800; color: var(--white); margin: 14px 0 22px; }
.price .cur { font-size: 24px; vertical-align: super; color: var(--accent); margin-right: 2px; }
.price .per { font-size: 15px; color: var(--gray); font-weight: 400; margin-left: 6px; }
.price-card ul { list-style: none; margin-bottom: 26px; }
.price-card li { padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--gray); font-size: 14.5px; }
.case { display: flex; flex-direction: column; }
.case-tag { margin-top: auto; padding-top: 14px; color: var(--accent); font-weight: 600; font-size: 13.5px; }

/* ===== CTA ===== */
.cta { position: relative; padding: 110px 0; overflow: hidden; text-align: center; }
.cta-bg { position: absolute; inset: 0; }
.cta-bg img { width: 100%; height: 100%; object-fit: cover; opacity: .35; }
.cta-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(0,212,170,.18), rgba(59,130,246,.18)); }
.cta-content { position: relative; z-index: 2; }
.cta-content h2 { font-size: 44px; margin-bottom: 14px; }
.cta-content p { font-size: 18px; margin-bottom: 30px; }

/* ===== 页脚 ===== */
.footer { background: var(--bg-2); border-top: 1px solid var(--line); padding: 64px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; }
.footer-brand p { font-size: 14px; margin: 14px 0 20px; max-width: 280px; }
.footer-col h4 { font-size: 15px; margin-bottom: 16px; color: var(--white); }
.footer-col a, .footer-col span { display: block; font-size: 14px; color: var(--gray); margin-bottom: 10px; transition: color .2s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { text-align: center; padding-top: 28px; margin-top: 40px; border-top: 1px solid var(--line); font-size: 13px; color: var(--gray); }

/* ===== 滚动动画 ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .about-grid, .product-grid { grid-template-columns: 1fr; gap: 36px; }
  .cards-3, .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); gap: 28px 12px; }
  .adv-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 60px; }
  h2 { font-size: 30px; }
}
@media (max-width: 640px) {
  .nav-links {
    position: fixed; top: 64px; right: 0; width: 260px; height: calc(100vh - 64px);
    background: rgba(13,17,23,.97); flex-direction: column; align-items: flex-start; gap: 18px;
    padding: 28px 24px; transform: translateX(100%); transition: transform .3s ease; border-left: 1px solid var(--line);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-toggle { display: flex; }
  .cards-3, .pricing-grid, .stats-grid { grid-template-columns: 1fr; }
  .price-card.hot { transform: none; }
  .hero-title { font-size: 48px; }
  .hero-sub { font-size: 20px; }
  .section { padding: 64px 0; }
  .footer-grid { grid-template-columns: 1fr; }
}