/* 配色与 dashboard/src/index.css 保持同一体系：
   冷调 slate + 天蓝 primary。改色值时两边同步。 */
:root {
  --fg: hsl(222 47% 11%);
  --fg-soft: hsl(215 16% 47%);
  --fg-muted: hsl(215 15% 52%);
  --bg: #ffffff;
  --surface: hsl(210 40% 96%);
  --dark: hsl(222 30% 7%);
  --dark-fg: hsl(210 20% 92%);
  --dark-fg-soft: hsl(215 16% 60%);
  --line: hsl(214 32% 91%);
  --line-dark: hsl(222 18% 20%);
  --primary: hsl(199 89% 48%);
  --primary-hover: hsl(199 89% 42%);
  --primary-bright: hsl(199 89% 56%);
  --primary-soft: hsl(199 85% 64%);
  --primary-deep: hsl(199 89% 32%);
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 84px; }
body {
  margin: 0;
  color: var(--fg);
  background: var(--bg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-weight: 650; letter-spacing: -0.04em; }
::selection { background: hsl(199 89% 48% / 0.28); }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; }
.container { width: min(1080px, calc(100% - 48px)); margin: 0 auto; }
.section { padding: 96px 0; }
.skip-link { position: absolute; top: -48px; left: 16px; z-index: 100; padding: 9px 13px; color: var(--bg); background: var(--primary-deep); font-size: 13px; }
.skip-link:focus { top: 12px; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid hsl(222 47% 11% / 0.08); background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(12px); }
.nav-wrap { display: flex; min-height: 66px; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { display: grid; width: 30px; height: 30px; place-items: center; color: var(--primary-deep); border: 1px solid hsl(199 89% 48% / 0.35); border-radius: 9px; background: hsl(199 89% 48% / 0.08); }
.brand-mark svg { width: 23px; height: 23px; }
.brand-name { font-size: 17px; font-weight: 750; letter-spacing: -0.04em; }
.brand-name span { color: var(--primary-deep); }
.desktop-nav { display: flex; gap: 24px; margin-left: auto; color: var(--fg-soft); font-size: 14px; }
.desktop-nav a:hover { color: var(--primary-deep); }
.nav-cta { padding: 9px 16px; color: var(--bg); border-radius: 6px; background: var(--primary); font-size: 13px; font-weight: 550; }
.nav-cta:hover { background: var(--primary-hover); }

/* Hero */
.hero { padding: 108px 0 96px; color: var(--dark-fg); background: var(--dark); }
.eyebrow { display: flex; align-items: center; gap: 9px; color: var(--primary-deep); font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; }
.eyebrow-light { color: var(--primary-soft); }
.eyebrow-dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.hero h1 { max-width: 720px; margin-top: 22px; font-size: clamp(44px, 7vw, 82px); line-height: 1.02; }
.hero h1 span { color: var(--primary-soft); }
.hero-lede { max-width: 600px; margin-top: 24px; color: var(--dark-fg-soft); font-size: 17px; line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { display: inline-flex; min-height: 47px; align-items: center; gap: 10px; padding: 0 20px; border: 1px solid transparent; border-radius: 6px; font-size: 14px; font-weight: 550; }
.button-primary { color: var(--dark); background: var(--primary-bright); }
.button-primary:hover { background: var(--primary-soft); }
.button-ghost { color: var(--dark-fg-soft); border-color: var(--line-dark); }
.button-ghost:hover { border-color: var(--primary-bright); color: var(--dark-fg); }
.hero-proof { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); max-width: 640px; margin-top: 52px; padding-top: 20px; border-top: 1px solid var(--line-dark); }
.hero-proof div { display: grid; gap: 4px; padding-right: 16px; border-right: 1px solid var(--line-dark); }
.hero-proof div + div { padding-left: 16px; }
.hero-proof div:last-child { border-right: 0; }
.hero-proof strong { color: var(--primary-soft); font-family: var(--mono); font-size: 12px; font-weight: 500; }
.hero-proof span { color: var(--dark-fg-soft); font-size: 12px; line-height: 1.45; }

/* How it works */
.section-intro { max-width: 680px; }
.section-intro h2 { font-size: clamp(30px, 4.2vw, 46px); line-height: 1.12; }
.section-intro h2 span { color: var(--fg-muted); }
.section-intro p { max-width: 620px; margin-top: 16px; color: var(--fg-soft); font-size: 16px; line-height: 1.8; }
.how-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 48px; }
.how-card { padding: 26px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.how-card h3 { font-size: 19px; }
.how-card p { margin-top: 12px; color: var(--fg-soft); font-size: 14px; line-height: 1.8; }

/* Plans */
.plans-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 48px; }
.plan-card { display: flex; flex-direction: column; padding: 30px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.plan-current { border-color: hsl(199 89% 48% / 0.45); background: var(--bg); box-shadow: 0 12px 40px hsl(199 89% 48% / 0.09); }
.plan-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.plan-badge { color: var(--primary-deep); font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; }
.plan-badge-muted { color: var(--fg-muted); }
.plan-flag { padding: 3px 10px; border-radius: 999px; background: hsl(199 89% 48% / 0.1); color: var(--primary-deep); font-size: 11.5px; font-weight: 550; }
.plan-flag-muted { color: var(--fg-muted); background: hsl(215 16% 47% / 0.1); }
.plan-price { display: flex; align-items: baseline; gap: 10px; margin-top: 18px; font-size: 38px; font-weight: 650; letter-spacing: -0.04em; }
.plan-price span { color: var(--fg-muted); font-size: 13px; font-weight: 400; letter-spacing: 0; }
.plan-price-muted { color: var(--fg-muted); }
.plan-lede { margin-top: 6px; color: var(--fg-soft); font-size: 14px; }
.plan-features { display: grid; gap: 10px; margin: 22px 0 0; padding: 0; list-style: none; }
.plan-features li { display: flex; align-items: baseline; gap: 10px; color: var(--fg-soft); font-size: 14px; }
.plan-features li::before { color: var(--primary-deep); content: "✓"; font-family: var(--mono); font-size: 12px; }
.plan-soon .plan-features li::before { color: var(--fg-muted); content: "·"; font-weight: 700; }
.plan-cta { justify-content: center; margin-top: 28px; }
.plan-cta-disabled { display: flex; min-height: 47px; align-items: center; justify-content: center; margin-top: 28px; border: 1px dashed var(--line); border-radius: 6px; color: var(--fg-muted); font-size: 14px; font-weight: 550; }

/* Download */
.download-section { border-top: 1px solid var(--line); background: var(--bg); }
.download-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 44px; }
.download-card { padding: 26px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.download-card h3 { font-size: 19px; }
.download-card > p { margin-top: 10px; color: var(--fg-soft); font-size: 13px; line-height: 1.7; }
.download-card code { padding: 1px 5px; border-radius: 4px; background: hsl(199 89% 48% / 0.08); color: var(--primary-deep); font-family: var(--mono); font-size: 11px; }
.file-link { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 10px; padding: 10px 14px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); font-family: var(--mono); font-size: 12px; transition: border-color 140ms ease; }
.file-link span { color: var(--primary-deep); font-size: 14px; }
.file-link:hover { border-color: var(--primary); }
.install-snippet { max-width: 760px; margin-top: 32px; }
.install-snippet span { display: block; margin-bottom: 10px; color: var(--fg-muted); font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; }
.install-snippet code { display: block; padding: 18px 20px; overflow-x: auto; border-radius: 8px; background: var(--dark); color: hsl(204 55% 78%); font-family: var(--mono); font-size: 12.5px; line-height: 1.75; }
.section-intro code { padding: 1px 5px; border-radius: 4px; background: hsl(199 89% 48% / 0.08); color: var(--primary-deep); font-family: var(--mono); font-size: 12px; }

/* Footer */
.site-footer { padding: 40px 0; color: var(--dark-fg-soft); background: hsl(222 30% 5%); }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 20px 32px; }
.site-footer .brand-mark { color: var(--primary-soft); border-color: hsl(199 89% 56% / 0.32); background: hsl(199 89% 56% / 0.07); }
.site-footer .brand-name { color: var(--dark-fg); }
.site-footer .brand-name span { color: var(--primary-soft); }
.footer-note { margin-right: auto; color: var(--dark-fg-soft); font-size: 13px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; font-size: 13px; }
.footer-links a:hover { color: var(--primary-soft); }

/* Responsive */
@media (max-width: 860px) {
  .desktop-nav { display: none; }
  .nav-cta { margin-left: auto; }
  .how-grid, .download-grid, .plans-grid { grid-template-columns: 1fr; }
  .hero { padding: 76px 0 72px; }
  .section { padding: 72px 0; }
  .hero-proof { grid-template-columns: 1fr; }
  .hero-proof div, .hero-proof div + div { padding: 10px 0; border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .hero-proof div:last-child { border-bottom: 0; }
}