* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --teal: #00e0b8;
  --teal-2: #00c9a7;
  --blue: #1a73e8;
  --ink: #06121a;
  --text: #e8f0f5;
  --muted: #9fb2c0;
  --muted-2: #6f8798;
  --line: rgba(0, 224, 184, .16);
  --card: rgba(13, 20, 33, .55);
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background:
    radial-gradient(1200px 800px at 15% 8%, #0e2233 0%, transparent 55%),
    radial-gradient(1000px 700px at 85% 92%, #0c1c2e 0%, transparent 55%),
    linear-gradient(135deg, #060a12 0%, #0a1220 60%, #071018 100%);
  background-attachment: fixed;
}
/* 背景网格 */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(0,224,184,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,224,184,.05) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 30%, #000 40%, transparent 100%);
  animation: gridShift 24s linear infinite;
}
@keyframes gridShift { from { background-position: 0 0, 0 0; } to { background-position: 46px 46px, 46px 46px; } }
/* 浮动光晕 */
.orb { position: fixed; border-radius: 50%; filter: blur(80px); opacity: .45; pointer-events: none; z-index: 0; }
.orb.a { width: 460px; height: 460px; background: #00e0b8; top: -140px; left: -120px; animation: float1 16s ease-in-out infinite; }
.orb.b { width: 400px; height: 400px; background: #1a73e8; bottom: -140px; right: -100px; animation: float2 20s ease-in-out infinite; }
.orb.c { width: 320px; height: 320px; background: #00c9a7; top: 50%; left: 60%; animation: float1 22s ease-in-out infinite; }
@keyframes float1 { 0%,100%{ transform: translate(0,0);} 50%{ transform: translate(50px,60px);} }
@keyframes float2 { 0%,100%{ transform: translate(0,0);} 50%{ transform: translate(-50px,-50px);} }

main, .site-header, .site-footer { position: relative; z-index: 2; }

/* ---------- 顶部导航 ---------- */
.site-header {
  display: flex; align-items: center; gap: 32px;
  padding: 16px 40px;
  position: sticky; top: 0; z-index: 50;
  background: rgba(6, 12, 22, .55);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.brand { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; text-decoration: none; color: var(--text); letter-spacing: .5px; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 11px;
  background: linear-gradient(135deg, var(--teal), var(--teal-2));
  color: var(--ink); display: flex; align-items: center; justify-content: center;
  font-weight: 800; box-shadow: 0 8px 22px rgba(0,224,184,.35);
}
.site-nav { display: flex; gap: 28px; margin-left: auto; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 500; transition: color .2s; }
.site-nav a:hover { color: var(--teal); }
.nav-cta {
  background: linear-gradient(135deg, var(--teal), var(--teal-2)); color: var(--ink);
  padding: 9px 20px; border-radius: 999px; text-decoration: none; font-size: 14px; font-weight: 700;
  box-shadow: 0 8px 22px rgba(0,224,184,.3);
}
.nav-toggle { display: none; background: none; border: none; color: var(--text); font-size: 22px; cursor: pointer; }

/* ---------- 首页 Hero ---------- */
.hero { text-align: center; padding: 110px 24px 0; position: relative; }
.hero-inner { max-width: 840px; margin: 0 auto; }
.hero-eyebrow { color: var(--teal); font-weight: 600; letter-spacing: 2px; font-size: 28px; text-transform: uppercase; }
.scan-line { width: 60px; height: 2px; margin: 16px auto 0; background: linear-gradient(90deg, transparent, var(--teal), transparent); }
.hero h1 { font-size: 52px; line-height: 1.2; margin: 20px 0; font-weight: 800; letter-spacing: .5px; }
.hero h1 b { background: linear-gradient(135deg, var(--teal), #4fd1ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { color: var(--muted); font-size: 18px; max-width: 640px; margin: 0 auto; line-height: 1.9; }
.hero-actions { display: flex; gap: 14px; justify-content: center; margin: 34px 0 30px; flex-wrap: wrap; }
.btn { padding: 14px 32px; border-radius: 999px; text-decoration: none; font-weight: 700; font-size: 15px; letter-spacing: .5px; transition: transform .15s, box-shadow .15s; }
.btn-primary { background: linear-gradient(135deg, var(--teal), var(--teal-2)); color: var(--ink); box-shadow: 0 12px 30px rgba(0,224,184,.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(0,224,184,.5); }
.btn-ghost { border: 1.5px solid var(--line); color: var(--text); background: rgba(255,255,255,.03); }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal); }
.hero-tags { list-style: none; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-tags li { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; font-weight: 500; }
.hero-tags li::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 10px rgba(0,224,184,.7); }

/* 数据条 */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  max-width: 980px; margin: 72px auto 0; transform: translateY(50%);
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  box-shadow: 0 30px 70px rgba(0,0,0,.5); backdrop-filter: blur(18px); overflow: hidden;
}
.stat { text-align: center; padding: 28px 12px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: none; }
.stat-num { display: block; font-size: 32px; font-weight: 800; color: var(--teal); text-shadow: 0 0 18px rgba(0,224,184,.4); }
.stat-label { color: var(--muted); font-size: 14px; }

/* ---------- 通用 section ---------- */
.section { max-width: 1140px; margin: 0 auto; padding: 100px 24px; }
.about { padding-top: 150px; }
.section-head { text-align: center; margin-bottom: 56px; }
.eyebrow { color: var(--teal); font-weight: 700; letter-spacing: 2px; font-size: 24px; text-transform: uppercase; margin-bottom: 10px; }
.section-head h2, .about-text h2 { font-size: 36px; font-weight: 800; letter-spacing: .5px; }
.section-desc { color: var(--muted); max-width: 640px; margin: 14px auto 0; line-height: 1.9; }

/* ---------- 功能简介 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 22px; }
.feature-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 32px;
  backdrop-filter: blur(12px); transition: transform .2s, box-shadow .2s, border-color .2s;
}
.feature-card:hover { transform: translateY(-5px); border-color: var(--teal); box-shadow: 0 20px 44px rgba(0,224,184,.16); }
.feature-icon {
  width: 48px; height: 48px; border-radius: 13px;
  background: linear-gradient(135deg, var(--teal), var(--teal-2)); color: var(--ink);
  font-weight: 800; display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
  box-shadow: 0 8px 22px rgba(0,224,184,.32);
}
.feature-card h3 { margin-bottom: 10px; font-size: 19px; }
.feature-card p { color: var(--muted); line-height: 1.8; }

/* ---------- 关于我们 ---------- */
.about-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: center; }
.about-text p { color: var(--muted); margin-top: 16px; line-height: 1.9; }
.about-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.about-card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 24px; backdrop-filter: blur(12px); }
.about-card h4 { color: var(--teal); margin-bottom: 8px; }
.about-card p { color: var(--muted); font-size: 14px; line-height: 1.8; }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; }
.contact-card { text-align: center; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 32px 20px; backdrop-filter: blur(12px); transition: border-color .2s, transform .2s; }
.contact-card:hover { border-color: var(--teal); transform: translateY(-4px); }
.contact-ic { font-size: 28px; margin-bottom: 12px; }
.contact-card h4 { margin-bottom: 6px; }
.contact-card p { color: var(--muted); }

/* ---------- 页脚 ---------- */
.site-footer { text-align: center; padding: 44px 24px; border-top: 1px solid var(--line); color: var(--muted-2); }
.footer-brand { display: inline-flex; align-items: center; gap: 8px; font-size: 18px; font-weight: 800; color: var(--text); margin-bottom: 10px; }
.footer-brand .brand-mark { width: 30px; height: 30px; font-size: 15px; }

/* ---------- 响应式 ---------- */
@media (max-width: 820px) {
  .site-nav, .nav-cta { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
  .site-nav.open { display: flex; flex-direction: column; position: absolute; top: 64px; right: 16px; background: rgba(6,12,22,.95); border: 1px solid var(--line); border-radius: 12px; padding: 14px 22px; gap: 16px; box-shadow: 0 20px 40px rgba(0,0,0,.5); }
  .hero { padding-top: 80px; }
  .hero h1 { font-size: 34px; }
  .stats { grid-template-columns: repeat(2, 1fr); transform: translateY(30%); }
  .stat:nth-child(2) { border-right: none; }
  .about-inner { grid-template-columns: 1fr; }
  .section { padding: 72px 20px; }
}