:root {
  --bg: #06101f;
  --ink: #eef7ff;
  --muted: #91a8c8;
  --blue: #2d7dff;
  --cyan: #23e7ff;
  --violet: #7c4dff;
  --line: rgba(119, 178, 255, .24);
  --card: rgba(7, 21, 42, .78);
  --card2: rgba(12, 31, 63, .9);
  --glow: 0 0 72px rgba(45, 125, 255, .34);
  --radius: 26px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background:
    linear-gradient(rgba(35,231,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35,231,255,.04) 1px, transparent 1px),
    radial-gradient(circle at 50% 12%, rgba(45,125,255,.52), transparent 26rem),
    radial-gradient(circle at 86% 22%, rgba(35,231,255,.22), transparent 26rem),
    linear-gradient(180deg, #030817 0%, #06152b 46%, #020711 100%);
  background-size: 42px 42px, 42px 42px, auto, auto, auto;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(3, 9, 22, .78);
  backdrop-filter: blur(18px);
}
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 900; letter-spacing: -.02em; }
.logo {
  width: 44px; height: 44px; border-radius: 14px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--cyan), var(--blue) 55%, var(--violet));
  color: white; box-shadow: var(--glow);
}
.links { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 14px; }
.links a, .lang { padding: 10px 13px; border-radius: 999px; border: 1px solid transparent; }
.links a:hover, .links .active { color: white; border-color: var(--line); background: rgba(45,125,255,.15); }
.lang { color: var(--cyan); border-color: var(--line); }

.hero { position: relative; overflow: hidden; padding: 96px 0 72px; }
.hero::before {
  content: ""; position: absolute; inset: 70px 7% auto auto; width: 520px; height: 520px;
  border-radius: 999px; border: 1px solid rgba(35,231,255,.18);
  background: radial-gradient(circle, rgba(45,125,255,.2), transparent 64%);
  box-shadow: inset 0 0 80px rgba(35,231,255,.14), var(--glow);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  box-shadow: 0 0 34px var(--cyan);
}
.hero-grid, .split { display: grid; grid-template-columns: 1.06fr .94fr; gap: 44px; align-items: center; }
.eyebrow { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.eyebrow span, .tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 12px; border-radius: 999px;
  color: #d7fbff; border: 1px solid rgba(35,231,255,.35);
  background: rgba(35,231,255,.08); font-size: 13px; font-weight: 900;
}
h1, h2, h3 { margin: 0; letter-spacing: -.04em; }
h1 { font-size: clamp(48px, 8vw, 96px); line-height: .92; max-width: 920px; }
h2 { font-size: clamp(30px, 4.2vw, 54px); line-height: 1.05; margin: 14px 0; }
h3 { font-size: 20px; margin-bottom: 10px; }
p { color: var(--muted); line-height: 1.8; }
.lead { font-size: 18px; max-width: 720px; margin: 24px 0; }
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px;
  padding: 0 20px; border-radius: 999px; font-weight: 900; color: #031021;
  background: linear-gradient(135deg, var(--cyan), #73a6ff);
  box-shadow: var(--glow);
}
.btn-soft { color: white; background: rgba(255,255,255,.06); border: 1px solid var(--line); box-shadow: none; }
.trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 30px; }
.trust div, .mini { border: 1px solid var(--line); border-radius: 18px; padding: 16px; background: rgba(255,255,255,.04); }
.trust b { display: block; color: white; font-size: 22px; }
.trust span { color: var(--muted); font-size: 13px; }

.device, .visual-card, .codebox {
  position: relative; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(14,38,76,.92), rgba(4,13,30,.76));
  box-shadow: var(--glow);
}
.device { padding: 16px; }
.device::before, .visual-card::before {
  content: "SYSTEM ONLINE"; position: absolute; right: 22px; top: 22px; z-index: 2;
  padding: 7px 11px; border-radius: 999px; font-size: 11px; letter-spacing: .12em;
  color: #d7fbff; background: rgba(3,10,24,.66); border: 1px solid var(--line);
}
.device img { border-radius: 20px; aspect-ratio: 4 / 5; object-fit: cover; }

section { padding: 74px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 26px; margin-bottom: 28px; }
.section-head p { max-width: 560px; margin: 0; }
.grid { display: grid; gap: 18px; }
.platforms { grid-template-columns: repeat(5, 1fr); }
.cards, .compat, .reco-grid, .use-grid { grid-template-columns: repeat(3, 1fr); }
.steps { grid-template-columns: repeat(3, 1fr); counter-reset: step; }
.faq { grid-template-columns: repeat(2, 1fr); }
.card, .step, .faq-item {
  padding: 24px; border-radius: 24px; border: 1px solid var(--line);
  background: var(--card); box-shadow: 0 18px 45px rgba(0,0,0,.2);
}
.card:hover, .step:hover, .faq-item:hover { border-color: rgba(35,231,255,.52); box-shadow: var(--glow); transform: translateY(-2px); }
.icon {
  width: 44px; height: 44px; display: grid; place-items: center; margin-bottom: 16px;
  border-radius: 15px; color: #d7fbff; border: 1px solid rgba(35,231,255,.32);
  background: rgba(35,231,255,.08);
}
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.meta span { color: var(--muted); font-size: 12px; border-radius: 999px; background: rgba(255,255,255,.06); padding: 7px 10px; }
.codebox { font-family: Consolas, "Courier New", monospace; color: #d7fbff; padding: 24px; line-height: 1.9; }
.checklist { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 18px; }
.checklist span { border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.04); padding: 14px; color: var(--muted); }
.reco img { height: 190px; width: 100%; object-fit: cover; border-radius: 18px; margin-bottom: 18px; }
.step::before {
  counter-increment: step; content: "STEP " counter(step);
  display: inline-flex; padding: 8px 11px; margin-bottom: 18px;
  border-radius: 999px; color: #031021; background: linear-gradient(135deg, var(--cyan), #74a7ff);
  font-weight: 900; font-size: 12px;
}
.cta-box {
  text-align: center; border-radius: 34px; padding: 48px; border: 1px solid rgba(35,231,255,.36);
  background: radial-gradient(circle at 50% 0, rgba(35,231,255,.18), transparent 28rem), var(--card2);
  box-shadow: var(--glow);
}
.footer { border-top: 1px solid var(--line); padding: 36px 0; color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(5, 1fr); gap: 18px; }
.footer b { display: block; color: white; margin-bottom: 10px; }

@media (max-width: 900px) {
  .nav { flex-direction: column; align-items: flex-start; padding: 16px 0; }
  .hero-grid, .split, .platforms, .cards, .compat, .reco-grid, .use-grid, .steps, .faq, .checklist, .footer-grid { grid-template-columns: 1fr; }
  .section-head { display: block; }
}