:root {
  --bg: #f7f9fc;
  --ink: #172033;
  --muted: #667085;
  --blue: #2563eb;
  --cyan: #0891b2;
  --line: #e4eaf3;
  --card: #ffffff;
  --soft: #eef5ff;
  --shadow: 0 18px 44px rgba(15, 23, 42, .08);
  --r: 24px;
}
* { 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(180deg, #fff 0%, var(--bg) 100%); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.topbar { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.9); backdrop-filter: blur(18px); border-bottom: 1px solid var(--line); }
.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; }
.logo { width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; color: white; background: var(--blue); box-shadow: var(--shadow); }
.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: var(--blue); background: var(--soft); border-color: #d7e6ff; }
.lang { color: var(--blue); border-color: var(--line); background: white; }
.hero { padding: 84px 0 62px; }
.hero-grid, .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 42px; align-items: center; }
.eyebrow { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.eyebrow span, .tag { display: inline-flex; padding: 8px 12px; border-radius: 999px; color: var(--blue); background: var(--soft); border: 1px solid #d7e6ff; font-size: 13px; font-weight: 900; }
h1, h2, h3 { margin: 0; letter-spacing: -.04em; }
h1 { font-size: clamp(42px, 7vw, 84px); line-height: 1; max-width: 940px; }
h2 { font-size: clamp(30px, 4vw, 50px); line-height: 1.08; margin: 14px 0; }
h3 { font-size: 20px; margin-bottom: 10px; }
p { color: var(--muted); line-height: 1.8; }
.lead { max-width: 720px; font-size: 18px; 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: 14px; font-weight: 900; color: white; background: var(--blue); box-shadow: 0 12px 26px rgba(37,99,235,.16); }
.btn-soft { color: var(--blue); background: white; border: 1px solid var(--line); box-shadow: none; }
.trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 30px; }
.trust div, .card, .step, .faq-item, .codebox, .visual-card { border: 1px solid var(--line); border-radius: var(--r); background: var(--card); box-shadow: var(--shadow); }
.trust div { padding: 16px; }
.trust b { display: block; color: var(--blue); font-size: 22px; }
.trust span { color: var(--muted); font-size: 13px; }
.device { position: relative; padding: 16px; border-radius: 28px; border: 1px solid var(--line); background: white; box-shadow: var(--shadow); overflow: hidden; }
.device::before { content: "CARD NAV"; position: absolute; right: 24px; top: 24px; z-index: 2; padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.86); color: var(--blue); border: 1px solid var(--line); font-size: 12px; font-weight: 900; }
.device img { border-radius: 20px; aspect-ratio: 4 / 5; object-fit: cover; }
section { padding: 72px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; 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; }
.card:hover, .step:hover, .faq-item:hover { transform: translateY(-3px); border-color: #c8dcff; }
.icon { width: 44px; height: 44px; display: grid; place-items: center; margin-bottom: 16px; border-radius: 14px; color: var(--blue); font-weight: 900; background: var(--soft); }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.meta span { color: var(--muted); font-size: 12px; border-radius: 999px; background: #f3f6fb; padding: 7px 10px; }
.codebox { padding: 24px; font-family: Consolas, "Courier New", monospace; color: #1747b5; 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; padding: 14px; color: var(--muted); background: white; }
.visual-card { padding: 16px; overflow: hidden; }
.visual-card img, .reco img { width: 100%; object-fit: cover; border-radius: 18px; }
.reco img { height: 190px; margin-bottom: 18px; }
.step::before { counter-increment: step; content: "Step " counter(step); display: inline-flex; padding: 8px 12px; border-radius: 999px; color: white; background: var(--cyan); font-size: 12px; font-weight: 900; margin-bottom: 16px; }
.cta-box { text-align: center; border-radius: 32px; padding: 48px; background: white; border: 1px solid var(--line); box-shadow: var(--shadow); }
.footer { padding: 36px 0; border-top: 1px solid var(--line); color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(5, 1fr); gap: 18px; }
.footer b { color: var(--ink); display: block; 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; } }