/* Shared across every page on this site (index, pricing, about, privacy, terms, refund, contact) —
   color tokens, base layout, header/nav and footer. Anything page-specific (hero sizing, feature
   cards, pricing cards, policy prose) stays in that page's own <style> block rather than growing
   this file into a catch-all.

   Tokens mirror the product app's own light palette exactly (app/src/index.css's :root block) —
   CLAUDE.md §6: "已在 app.vantikus.com 登录页落地，后续页面都按这套基调延伸，不要另起风格". This
   site has no theme toggle of its own, so it stays fixed to the app's LIGHT tokens regardless of
   OS preference — a marketing site presenting one deliberate brand face, same choice plenty of
   marketing sites make even where the product behind them is dark-mode-aware. */
:root {
  --bg: #F4F1EC;
  --bg-elevated: #FFFFFF;
  --border: #E4DFD3;
  --text: #1A1A18;
  --text-muted: #6B6558;
  --accent: #1355FF;
  --accent-soft: #E8EFFF;
  --radius: 1rem;
  --radius-sm: 0.625rem;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, .logo, .nav-cta, .btn-primary, .btn-secondary, .plan-cta {
  font-family: 'Sora', -apple-system, sans-serif;
}
a { color: inherit; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(244, 241, 236, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px;
  max-width: 1120px; margin: 0 auto;
}
.logo {
  font-weight: 700; font-size: 19px; letter-spacing: -0.01em;
  text-decoration: none; color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.logo-mark {
  height: 20px;
  width: auto;
  display: inline-block;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  font-family: 'IBM Plex Sans', sans-serif;
}
.nav-link:hover {
  color: var(--text);
}
.nav-cta {
  text-decoration: none;
  background: var(--accent);
  color: #fff;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
}
.nav-cta:hover {
  background: #0f47d6;
}

footer {
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 14px;
  border-top: 1px solid var(--border);
}
footer .container {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
footer .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  font-size: 14px;
}
footer .footer-links a {
  text-decoration: none;
  color: var(--text-muted);
}
footer .footer-links a:hover {
  color: var(--text);
}
footer .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
footer .legal {
  font-size: 13px;
  opacity: 0.75;
}

/* Shared prose styling for the policy pages (about/privacy/terms/refund/contact) — a plain,
   readable legal-document layout, distinct from the marketing-page hero/feature styles that stay
   local to index.html/pricing.html. */
.doc {
  padding: 56px 0 100px;
}
.doc h1 {
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}
.doc .updated {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0 0 40px;
}
.doc h2 {
  font-size: 20px;
  letter-spacing: -0.01em;
  margin: 36px 0 12px;
}
.doc p, .doc li {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}
.doc ul {
  padding-left: 20px;
  margin: 12px 0;
}
.doc a {
  color: var(--accent);
}
.doc strong {
  color: var(--text);
}
.doc .content {
  max-width: 720px;
}