:root {
  color-scheme: dark;
  --bg: #0a1020;
  --surface: rgba(17, 28, 51, .82);
  --surface-strong: #15233f;
  --text: #f5f8ff;
  --muted: #a8b5cc;
  --line: rgba(178, 202, 240, .16);
  --blue: #5a8dff;
  --blue-strong: #3873f5;
  --mint: #6fe0c0;
  --amber: #ffc56a;
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body { margin: 0; background: radial-gradient(circle at 22% 0%, #1d3466 0, transparent 33rem), var(--bg); color: var(--text); }
a { color: inherit; text-decoration: none; }

.shell { max-width: 1180px; margin: 0 auto; padding: 0 28px; }
.nav { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); }
.brand { font-weight: 800; letter-spacing: .02em; font-size: 19px; }
.brand span { color: var(--mint); }
.nav-links { display: flex; align-items: center; gap: 22px; color: var(--muted); font-size: 14px; }
.nav-links a:hover { color: var(--text); }

.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border: 1px solid transparent; border-radius: 10px; cursor: pointer; font-weight: 700; transition: .18s ease; }
.button-primary { background: var(--blue); color: white; box-shadow: 0 12px 32px rgba(60, 112, 245, .24); }
.button-primary:hover { background: var(--blue-strong); transform: translateY(-1px); }
.button-secondary { border-color: var(--line); background: rgba(255,255,255,.03); color: var(--text); }
.button-secondary:hover { border-color: rgba(178,202,240,.4); background: rgba(255,255,255,.07); }
.button-small { min-height: 36px; padding: 0 13px; font-size: 13px; }

.hero { padding: 96px 0 60px; display: grid; grid-template-columns: 1.2fr .8fr; gap: 46px; align-items: center; }
.eyebrow { color: var(--mint); font-size: 13px; font-weight: 700; letter-spacing: .08em; }
h1 { margin: 14px 0 18px; max-width: 760px; font-size: clamp(40px, 5vw, 68px); line-height: 1.08; letter-spacing: -.045em; }
.lead { max-width: 650px; margin: 0; color: var(--muted); font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-card, .panel, .feature, .price-card { border: 1px solid var(--line); background: var(--surface); border-radius: 18px; box-shadow: 0 20px 50px rgba(0,0,0,.2); }
.hero-card { padding: 26px; }
.stat + .stat { border-top: 1px solid var(--line); margin-top: 17px; padding-top: 17px; }
.stat-label { color: var(--muted); font-size: 13px; }
.stat-value { margin-top: 6px; font-size: 22px; font-weight: 800; }
.stat-value em { font-style: normal; color: var(--mint); }

.section { padding: 54px 0; }
.section h2 { margin: 0; font-size: 30px; letter-spacing: -.03em; }
.section-intro { max-width: 720px; color: var(--muted); line-height: 1.8; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.feature { min-height: 196px; padding: 23px; }
.feature .number { color: var(--mint); font-weight: 800; font-size: 13px; }
.feature h3 { margin: 18px 0 8px; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.future { opacity: .68; }

.product-hero { padding: 66px 0 34px; }
.product-hero h1 { font-size: clamp(36px, 4.8vw, 56px); }
.product-meta { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 0; }
.chip { padding: 7px 10px; border-radius: 99px; border: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.chip.accent { color: #ddfff4; border-color: rgba(111,224,192,.35); background: rgba(111,224,192,.1); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.panel { padding: 25px; }
.panel h2 { margin: 0; font-size: 22px; }
.panel p { color: var(--muted); line-height: 1.75; }
.price-list { display: grid; gap: 12px; margin-top: 18px; }
.price-card { padding: 17px; display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.price-card strong { font-size: 18px; }
.price-card span { color: var(--amber); font-weight: 800; }
.notice { margin-top: 22px; padding: 14px 16px; border-left: 3px solid var(--mint); border-radius: 7px; background: rgba(111,224,192,.08); color: #d4fdf1; font-size: 14px; line-height: 1.7; }
.account-card { margin-top: 18px; padding: 20px; border-radius: 12px; background: var(--surface-strong); }
.account-card strong { display: block; margin-bottom: 8px; }
.account-card p { margin: 0; }

.placeholder { max-width: 650px; margin: 64px auto 90px; padding: 34px; text-align: center; }
.placeholder h1 { margin-left: auto; margin-right: auto; font-size: 38px; }
.placeholder .lead { margin-left: auto; margin-right: auto; }
.footer { margin-top: 56px; padding: 28px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }

@media (max-width: 760px) {
  .shell { padding: 0 18px; }
  .nav { min-height: 62px; }
  .nav-links a:not(.button) { display: none; }
  .hero, .two-col { grid-template-columns: 1fr; }
  .hero { padding-top: 62px; gap: 24px; }
  .grid { grid-template-columns: 1fr; }
  h1 { font-size: 42px; }
}