:root {
  --bg: #f4f7fb;
  --ink: #0f172a;
  --muted: #64748b;
  --blue: #2563eb;
  --cyan: #06b6d4;
  --green: #10b981;
  --line: #dbe6f2;
  --card: rgba(255, 255, 255, .92);
  --shadow: 0 24px 80px rgba(15, 23, 42, .10);
  --r: 30px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 80% 8%, rgba(6, 182, 212, .18), transparent 26%),
    radial-gradient(circle at 12% 18%, rgba(37, 99, 235, .12), transparent 26%),
    linear-gradient(180deg, #f4f7fb 0%, #edf4ff 58%, #ffffff 100%);
  background-size: auto, auto, auto;
  line-height: 1.72;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1180px, calc(100% - 40px)); margin: auto; }
.topbar { position: sticky; top: 0; z-index: 10; background: rgba(255, 255, 255, .86); backdrop-filter: blur(18px); border-bottom: 1px solid var(--line); }
.nav { height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 900; }
.logo { width: 42px; height: 42px; border-radius: 16px; background: linear-gradient(145deg, var(--blue), var(--cyan)); color: #fff; display: grid; place-items: center; box-shadow: 0 16px 42px rgba(37, 99, 235, .22); }
.links { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.links a, .lang, .pill { padding: 10px 15px; border-radius: 18px; background: #eef6ff; color: #1d4ed8; border: 1px solid var(--line); font-size: 14px; font-weight: 800; }
.hero { padding: 86px 0 52px; }
.hero-grid, .workflow { display: grid; grid-template-columns: 1.04fr .96fr; gap: 42px; align-items: center; }
.eyebrow { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.eyebrow span { padding: 8px 13px; border-radius: 18px; border: 1px solid var(--line); background: #fff; color: var(--blue); font-weight: 900; font-size: 13px; }
h1 { font-size: clamp(40px, 6vw, 72px); line-height: 1.03; letter-spacing: -.06em; margin: 0 0 22px; }
h2 { font-size: clamp(28px, 4vw, 44px); line-height: 1.12; letter-spacing: -.04em; margin: 0; }
.lead, .section-title p, .card p, .footer { color: var(--muted); }
.lead { font-size: 19px; max-width: 720px; margin: 0 0 30px; }
.actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 24px 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 22px; border-radius: 20px; font-weight: 900; border: 1px solid var(--line); }
.btn-primary { border: 0; color: #fff; background: linear-gradient(135deg, var(--blue), var(--cyan)); box-shadow: 0 16px 42px rgba(18, 104, 255, .28); }
.btn-soft { background: rgba(255, 255, 255, .94); color: var(--blue); }
.device, .card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow); }
.device { padding: 18px; position: relative; overflow: hidden; background: #fff; border: 1px solid var(--line); }
.device::after { content: ""; position: absolute; left: 18px; right: 18px; bottom: 18px; height: 1px; background: linear-gradient(90deg, transparent, rgba(37, 99, 235, .22), transparent); }
.device::before { content: ""; position: absolute; inset: 18px; border-radius: 18px; background: linear-gradient(120deg, transparent, rgba(6, 182, 212, .18), transparent); mix-blend-mode: screen; pointer-events: none; z-index: 1; }
.device img, .reco img { border-radius: 18px; aspect-ratio: 16 / 10; object-fit: cover; }
.trust, .grid { display: grid; gap: 18px; }
.trust { grid-template-columns: repeat(3, 1fr); margin-top: 22px; }
.trust .card { padding: 18px; }
.trust strong { display: block; font-size: 28px; }
.section { padding: 58px 0; }
.section-title { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card { padding: 24px; min-height: 150px; }
.grid-3 .card:nth-child(1) { grid-column: span 2; }
.grid-3 .card:nth-child(6) { grid-column: span 2; }
.card h3 { margin: 0 0 8px; font-size: 20px; }
.icon { width: 42px; height: 42px; border-radius: 14px; background: rgba(57, 232, 255, .12); color: var(--cyan); display: grid; place-items: center; font-weight: 900; margin-bottom: 14px; }
.status { color: var(--green); font-weight: 900; }
.codebox { background: rgba(0, 8, 20, .92); color: #dff7ff; border-radius: var(--r); padding: 24px; font-family: Consolas, monospace; overflow: auto; border: 1px solid rgba(24, 217, 255, .24); box-shadow: inset 0 0 36px rgba(24, 217, 255, .08); }
.codebox span { color: #58dcff; }
.list { display: grid; gap: 12px; margin-top: 18px; }
.list div, .notice { padding: 14px 16px; border-radius: 16px; background: rgba(57, 232, 255, .10); color: #d7efff; }
.notice { border-left: 4px solid var(--cyan); background: rgba(57, 232, 255, .10); color: #d7efff; }
.step { position: relative; padding-left: 66px; }
.step::before { content: attr(data-step); position: absolute; left: 22px; top: 24px; width: 30px; height: 30px; border-radius: 50%; background: var(--blue); color: #fff; display: grid; place-items: center; font-weight: 900; }
.faq details { padding: 20px 22px; border: 1px solid var(--line); border-radius: 20px; background: rgba(8, 22, 48, .76); }
.faq summary { cursor: pointer; font-weight: 900; }
.cta { padding: 72px 0; }
.cta-box { text-align: center; padding: 54px 24px; border-radius: 38px; color: #fff; background: linear-gradient(135deg, var(--blue), var(--cyan)); box-shadow: 0 30px 90px rgba(18, 104, 255, .3); }
.cta-box h2 { font-size: clamp(32px, 5vw, 54px); margin: 0 0 12px; }
.cta-box p { max-width: 650px; margin: 0 auto 22px; opacity: .92; }
.footer { padding: 42px 0; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.3fr repeat(5, 1fr); gap: 22px; }
.footer h4 { margin: 0 0 10px; color: var(--ink); }
.section-title h2, .card h3, .brand, h1, h2 { color: var(--ink); }
.footer a { display: block; margin: 7px 0; }
@media (max-width: 900px) {
  .links { display: none; }
  .hero-grid, .workflow, .grid-2, .grid-3, .grid-4, .footer-grid, .trust { grid-template-columns: 1fr; }
  .grid-3 .card:nth-child(1), .grid-3 .card:nth-child(6) { grid-column: auto; }
  h1 { font-size: 42px; }
}