:root {
  --bg: #050810;
  --panel: #0c1420;
  --panel2: #101b2a;
  --line: rgba(130, 166, 214, 0.16);
  --text: #eaf2ff;
  --muted: #8ea3bf;
  --cyan: #49e0d0;
  --blue: #4c9dff;
  --amber: #f6c453;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 0%, rgba(76,157,255,.16), transparent 34rem),
    radial-gradient(circle at 95% 40%, rgba(73,224,208,.08), transparent 40rem),
    var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
.bg-grid {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(rgba(120,160,210,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,160,210,.04) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(circle at 50% 0%, #000 10%, transparent 75%);
}
.nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 32px;
  padding: 18px 6vw;
  background: rgba(5, 8, 16, 0.78);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(130,166,214,.1);
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand strong { display: block; font-size: 16px; letter-spacing: .02em; }
.brand small { display: block; color: var(--muted); font-size: 9px; letter-spacing: .24em; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(140deg, var(--cyan), var(--blue));
  color: #04101b; font-weight: 900; font-size: 19px;
  box-shadow: 0 10px 30px rgba(76,157,255,.25);
}
.brand-mark.small { width: 34px; height: 34px; border-radius: 10px; font-size: 16px; }
.nav nav { display: flex; gap: 26px; margin-left: auto; color: var(--muted); font-size: 14px; }
.nav nav a:hover { color: var(--text); }
.nav-cta {
  border: 1px solid rgba(73,224,208,.35); color: #8ff0c8;
  padding: 8px 14px; border-radius: 9px; font-size: 13px;
  background: rgba(73,224,208,.06);
}
main { position: relative; z-index: 1; }
.hero {
  display: grid; grid-template-columns: 1.02fr 0.98fr; gap: 60px;
  align-items: center; padding: 90px 6vw 70px; min-height: 760px;
}
.eyebrow {
  display: flex; align-items: center; gap: 9px;
  color: var(--cyan); font-size: 12px; font-weight: 800;
  letter-spacing: .2em; text-transform: uppercase;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px rgba(73,224,208,.8); }
.hero h1 {
  margin: 22px 0 20px; font-size: clamp(48px, 6.4vw, 92px);
  line-height: 1.06; letter-spacing: -0.055em; font-weight: 900;
}
.hero h1 span {
  background: linear-gradient(120deg, #fff 12%, #8fd8ff 55%, var(--cyan));
  -webkit-background-clip: text; color: transparent;
}
.lead { color: #b9cbe1; font-size: 18px; max-width: 620px; line-height: 1.9; }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 13px 22px; border-radius: 11px;
  font-size: 15px; font-weight: 800; border: 1px solid transparent;
  transition: transform .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary { color: #04101b; background: linear-gradient(135deg, var(--cyan), #7cc4ff); box-shadow: 0 16px 40px rgba(73,224,208,.16); }
.btn.ghost { color: #cfe0f3; border-color: var(--line); background: rgba(16,27,42,.55); }
.btn.full { width: 100%; margin-top: 20px; }
.hero-note { margin-top: 18px; color: #7186a0; font-size: 12px; letter-spacing: .04em; }
.hero-visual { position: relative; }
.video-shell {
  border: 1px solid rgba(130,166,214,.22); border-radius: 22px;
  background: linear-gradient(180deg, rgba(16,27,42,.9), rgba(6,11,18,.95));
  padding: 10px; box-shadow: 0 40px 100px rgba(0,0,0,.55);
}
.video-shell video { display: block; width: 100%; aspect-ratio: 16/9; border-radius: 14px; background: #000; }
.video-caption {
  display: flex; justify-content: space-between; padding: 9px 6px 2px;
  color: #6e849f; font-size: 11px; letter-spacing: .05em;
}
.float-card {
  position: absolute; border: 1px solid rgba(73,224,208,.28);
  background: rgba(8,15,25,.9); color: #b9efdf; border-radius: 999px;
  padding: 9px 14px; font-size: 12px; backdrop-filter: blur(10px);
  box-shadow: 0 14px 30px rgba(0,0,0,.35);
}
.float-a { top: -18px; right: 22px; }
.float-b { bottom: 42px; left: -24px; color: #9fc8ff; border-color: rgba(76,157,255,.28); }
.pulse { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); margin-right: 4px; box-shadow: 0 0 10px rgba(73,224,208,.8); }
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  margin: 0 6vw; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  background: rgba(11,19,30,.42);
}
.stats div { padding: 24px 28px; border-right: 1px solid var(--line); }
.stats div:last-child { border-right: 0; }
.stats strong { display: block; font-size: 28px; letter-spacing: -0.03em; }
.stats span { color: var(--muted); font-size: 12px; }
.section { padding: 92px 6vw; }
.section-head { max-width: 700px; }
.section-head h2 { margin: 16px 0 12px; font-size: clamp(34px, 3.8vw, 56px); line-height: 1.1; letter-spacing: -0.045em; }
.section-head p { color: var(--muted); font-size: 16px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 38px; }
.feature {
  border: 1px solid var(--line); border-radius: 18px; padding: 28px;
  background: linear-gradient(150deg, rgba(16,27,42,.8), rgba(7,12,20,.66));
}
.feature .icon {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(76,157,255,.1); border: 1px solid rgba(76,157,255,.24);
  color: #9fc8ff; font-size: 19px; margin-bottom: 20px;
}
.feature .icon.cyan { color: #8ff0c8; background: rgba(73,224,208,.08); border-color: rgba(73,224,208,.26); }
.feature .icon.amber { color: #f6d58a; background: rgba(246,196,83,.08); border-color: rgba(246,196,83,.25); }
.feature h3 { margin: 0 0 8px; font-size: 19px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 34px; }
.step { border-top: 1px solid rgba(73,224,208,.35); padding: 24px 0 0; }
.step span { color: var(--cyan); font-size: 12px; letter-spacing: .16em; }
.step h3 { margin: 12px 0 8px; font-size: 22px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }
.security {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
  background: linear-gradient(110deg, rgba(73,224,208,.05), transparent 60%);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.security h2 { margin: 16px 0 16px; font-size: clamp(34px, 3.5vw, 52px); line-height: 1.12; letter-spacing: -0.045em; }
.security p { color: var(--muted); }
.security ul { padding-left: 18px; color: #c3d3e6; font-size: 14px; line-height: 2; }
.security-visual { display: flex; align-items: center; gap: 0; }
.security-visual .node { width: 130px; height: 130px; border-radius: 22px; border: 1px solid var(--line); background: rgba(13,21,34,.86); display: grid; place-items: center; text-align: center; }
.security-visual .node span { display: block; color: var(--cyan); font-size: 12px; letter-spacing: .16em; }
.security-visual .node strong { display: block; margin-top: 6px; font-size: 15px; }
.security-visual .node.cloud { border-color: rgba(73,224,208,.3); }
.security-visual .wire { flex: 1; height: 1px; background: linear-gradient(90deg, rgba(76,157,255,.2), rgba(73,224,208,.6), rgba(76,157,255,.2)); position: relative; }
.security-visual .wire i { position: absolute; width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); top: -3px; left: 50%; box-shadow: 0 0 12px rgba(73,224,208,.8); }
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 36px; }
.price-card { border: 1px solid var(--line); border-radius: 20px; padding: 28px; background: rgba(12,20,32,.72); position: relative; }
.price-card.featured { border-color: rgba(73,224,208,.35); box-shadow: inset 0 0 50px rgba(73,224,208,.04); }
.price-card .tag { position: absolute; right: 20px; top: 20px; color: var(--cyan); font-size: 10px; border: 1px solid rgba(73,224,208,.3); border-radius: 999px; padding: 4px 8px; }
.price-card h3 { margin: 0; font-size: 19px; }
.price { font-size: 40px; font-weight: 900; margin: 18px 0; letter-spacing: -0.04em; }
.price span { font-size: 12px; color: var(--muted); font-weight: 400; margin-left: 4px; }
.price-card ul { list-style: none; padding: 0; margin: 0; color: var(--muted); font-size: 14px; line-height: 2.1; }
.price-card li::before { content: "·"; color: var(--cyan); margin-right: 8px; }
.faq { max-width: 1000px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--line); padding: 20px 0; }
.faq summary { cursor: pointer; font-size: 17px; font-weight: 700; }
.faq p { color: var(--muted); font-size: 14px; margin: 12px 0 0; }
.cta {
  display: flex; align-items: center; justify-content: space-between; gap: 30px;
  margin: 0 6vw 80px; padding: 44px; border: 1px solid rgba(73,224,208,.26); border-radius: 24px;
  background: linear-gradient(120deg, rgba(73,224,208,.08), rgba(76,157,255,.06));
}
.cta h2 { margin: 12px 0 6px; font-size: clamp(30px, 4vw, 48px); letter-spacing: -0.04em; }
.cta p { margin: 0; color: var(--muted); }
footer {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
  padding: 30px 6vw; border-top: 1px solid var(--line); color: #6f849e; font-size: 12px;
}
footer .brand { color: var(--text); }
footer p { margin: 0; }
footer .fine { margin-left: auto; color: #4e6075; }
@media (max-width: 980px) {
  .nav nav { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 54px; min-height: auto; }
  .hero-visual { margin-top: 14px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats div:nth-child(2) { border-right: 0; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .security { grid-template-columns: 1fr; }
  .pricing { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .cta { flex-direction: column; align-items: flex-start; margin-bottom: 50px; }
}
@media (max-width: 600px) {
  .nav { padding: 14px 20px; gap: 12px; }
  .nav-cta { margin-left: auto; }
  .hero { padding: 42px 20px 40px; gap: 34px; }
  .hero h1 { font-size: 50px; }
  .lead { font-size: 15px; }
  .stats { margin: 0 20px; }
  .stats div { padding: 18px; }
  .section { padding: 64px 20px; }
  .feature-grid { grid-template-columns: 1fr; }
  .float-a { right: 8px; top: -14px; }
  .float-b { left: 8px; bottom: 38px; }
  .security-visual .node { width: 92px; height: 92px; border-radius: 16px; }
  .security-visual .node strong { font-size: 12px; }
  .cta { margin: 0 20px 50px; padding: 28px; }
  footer { padding: 24px 20px; }
  footer .fine { margin-left: 0; }
}