:root {
  --bg: #06152b;
  --ink: #f2f8ff;
  --muted: #96abc9;
  --blue: #2d7dff;
  --cyan: #20d9ff;
  --line: rgba(117, 173, 255, .24);
  --card: rgba(8, 25, 52, .78);
  --shadow: 0 24px 70px rgba(45,125,255,.18);
  --r: 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: radial-gradient(circle at 14% 8%, rgba(32,217,255,.22), transparent 26rem), radial-gradient(circle at 84% 18%, rgba(45,125,255,.34), transparent 28rem), linear-gradient(180deg, #020817 0%, var(--bg) 52%, #030a16 100%); }
body::before { content: ""; position: fixed; inset: 0; pointer-events: none; opacity: .4; background: repeating-linear-gradient(90deg, transparent 0 68px, rgba(32,217,255,.07) 69px 70px); }
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(4,13,29,.78); 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: 44px; height: 44px; border-radius: 16px; display: grid; place-items: center; color: #031021; background: linear-gradient(135deg, var(--cyan), var(--blue)); box-shadow: 0 0 38px rgba(32,217,255,.36); }
.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; background: rgba(45,125,255,.16); border-color: var(--line); }
.lang { color: var(--cyan); border-color: var(--line); }
.hero { position: relative; padding: 92px 0 68px; overflow: hidden; }
.hero::after { content: ""; position: absolute; left: -10%; right: -10%; top: 42%; height: 140px; background: url("data:image/svg+xml,%3Csvg width='1200' height='140' viewBox='0 0 1200 140' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 90 C140 20 230 125 360 70 S610 20 760 82 1010 120 1200 30' fill='none' stroke='%2320d9ff' stroke-width='4' stroke-opacity='.35'/%3E%3Cpath d='M0 108 C180 60 280 125 430 86 S680 45 830 98 1050 130 1200 68' fill='none' stroke='%232d7dff' stroke-width='3' stroke-opacity='.32'/%3E%3C/svg%3E") center/cover no-repeat; animation: wave 8s linear infinite; pointer-events: none; }
@keyframes wave { from { transform: translateX(0); } to { transform: translateX(80px); } }
.hero-grid, .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 46px; align-items: center; position: relative; z-index: 1; }
.eyebrow { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.eyebrow span, .tag { display: inline-flex; padding: 8px 12px; border-radius: 999px; color: #d7fbff; background: rgba(32,217,255,.09); border: 1px solid rgba(32,217,255,.32); font-size: 13px; font-weight: 900; }
h1, h2, h3 { margin: 0; letter-spacing: -.04em; }
h1 { font-size: clamp(44px, 7.4vw, 92px); line-height: .95; max-width: 940px; }
h2 { font-size: clamp(30px, 4vw, 52px); line-height: 1.06; 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: 999px; font-weight: 900; color: #031021; background: linear-gradient(135deg, var(--cyan), #74a7ff); box-shadow: 0 0 34px rgba(32,217,255,.28); }
.btn-soft { color: var(--ink); 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, .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(--cyan); font-size: 22px; }
.trust span { color: var(--muted); font-size: 13px; }
.device { position: relative; padding: 16px; border-radius: 34px; border: 1px solid var(--line); background: linear-gradient(145deg, rgba(32,217,255,.12), rgba(45,125,255,.08)); box-shadow: 0 0 80px rgba(45,125,255,.18); overflow: hidden; }
.device::before { content: "SPEED CURVE"; position: absolute; right: 24px; top: 24px; z-index: 2; padding: 8px 12px; border-radius: 999px; background: rgba(3,10,24,.7); color: var(--cyan); border: 1px solid var(--line); font-size: 12px; font-weight: 900; }
.device img { border-radius: 24px; aspect-ratio: 4 / 5; object-fit: cover; }
section { padding: 74px 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; }
.icon { width: 44px; height: 44px; display: grid; place-items: center; margin-bottom: 16px; border-radius: 16px; color: #031021; font-weight: 900; background: linear-gradient(135deg, var(--cyan), var(--blue)); }
.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 { padding: 24px; font-family: Consolas, "Courier New", monospace; color: #d7fbff; 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: rgba(255,255,255,.04); }
.visual-card { padding: 16px; overflow: hidden; }
.visual-card img, .reco img { width: 100%; object-fit: cover; border-radius: 20px; }
.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: #031021; background: var(--cyan); font-size: 12px; font-weight: 900; margin-bottom: 16px; }
.cta-box { text-align: center; border-radius: 34px; padding: 48px; border: 1px solid rgba(32,217,255,.3); background: radial-gradient(circle at 50% 0, rgba(32,217,255,.18), transparent 28rem), var(--card); box-shadow: 0 0 80px rgba(45,125,255,.16); }
.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; } }