/* 硕博汇官网 — 复用 mobile/src/theme.ts 的「官方档案」设计令牌 */

:root {
  --navy: #16273f;
  --navy-deep: #0f1c30;
  --navy-soft: #e7ebf1;
  --on-navy: #f4f1ea;
  --on-navy-sub: #9fb0c6;

  --bg: #f4f1ea;
  --surface: #fbf9f3;
  --surface-alt: #efe7d6;
  --gold-wash: #faf4e6;

  --brass: #b99653;
  --gold: #d9b978;
  --gold-deep: #9a7433;

  --text: #16273f;
  --text-body: #4a4638;
  --text-sub: #6d6353;
  --text-faint: #8a7a5e;
  --text-dim: #a09a8c;

  --border: #ded6c6;
  --hairline: #ece5d6;

  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-body);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--gold-deep); }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(244, 241, 234, 0.92);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--navy); color: var(--on-navy);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-weight: 700; font-size: 13px;
  flex-shrink: 0;
}
.brand-name { font-family: var(--serif); font-weight: 700; font-size: 19px; color: var(--text); }
.nav-links { display: flex; gap: 28px; flex-wrap: wrap; }
.nav-links a {
  color: var(--text-sub); text-decoration: none; font-size: 14.5px; font-weight: 500;
}
.nav-links a:hover { color: var(--gold-deep); }

/* ── Hero ── */
.hero { padding: 76px 0 56px; }
.eyebrow {
  font-family: var(--serif); font-size: 13px; letter-spacing: 3px;
  color: var(--gold-deep); margin: 0 0 14px;
}
.hero h1 {
  font-family: var(--serif); font-weight: 700; color: var(--text);
  font-size: clamp(2.2rem, 1.7rem + 2vw, 3.4rem);
  line-height: 1.2; margin: 0 0 18px;
}
.hero-lede {
  font-size: 17.5px; color: var(--text-body); max-width: 640px; margin: 0 0 30px;
}
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 10px;
  font-size: 15px; font-weight: 600; text-decoration: none;
  border: 1.5px solid transparent;
}
.btn-primary { background: var(--navy); color: var(--on-navy); }
.btn-primary:hover { background: var(--navy-deep); }
.btn-secondary { background: transparent; color: var(--navy); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--brass); }
.btn[aria-disabled="true"] {
  background: var(--surface-alt); color: var(--text-faint); border-color: var(--border);
  pointer-events: none;
}

/* ── Section shell ── */
section { padding: 64px 0; border-top: 1px solid var(--hairline); }
.section-head { max-width: 680px; margin: 0 0 40px; }
.section-eyebrow {
  font-size: 12.5px; letter-spacing: 2px; color: var(--gold-deep); font-weight: 600; margin: 0 0 10px;
}
h2 {
  font-family: var(--serif); font-weight: 700; color: var(--text);
  font-size: clamp(1.5rem, 1.3rem + 1vw, 2rem); margin: 0 0 14px;
}
.section-desc { color: var(--text-sub); font-size: 15.5px; }

/* ── Feature cards ── */
.grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px;
}
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 26px 24px;
}
.card-num {
  font-family: var(--serif); font-weight: 700; color: var(--gold-deep); font-size: 14px; margin: 0 0 10px;
}
.card h3 { font-size: 17px; font-weight: 700; color: var(--text); margin: 0 0 8px; }
.card p { font-size: 14.5px; color: var(--text-sub); margin: 0; }

/* ── Download ── */
.download-panel {
  background: var(--navy); color: var(--on-navy); border-radius: 18px;
  padding: 40px; display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px;
}
.download-col h3 { font-family: var(--serif); font-size: 19px; margin: 0 0 6px; color: var(--on-navy); }
.download-col p { color: var(--on-navy-sub); font-size: 14px; margin: 0 0 18px; }
.download-panel .btn-primary { background: var(--gold); color: var(--navy-deep); }
.download-panel .btn-primary:hover { background: var(--on-navy); }
.download-panel .btn[aria-disabled="true"] { background: rgba(244,241,234,0.1); color: var(--on-navy-sub); border-color: rgba(244,241,234,0.2); }

/* ── Footer ── */
footer { border-top: 1px solid var(--hairline); padding: 40px 0; }
.footer-row {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; flex-wrap: wrap;
}
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--text-sub); text-decoration: none; font-size: 13.5px; }
.footer-links a:hover { color: var(--gold-deep); }
.footer-meta { font-size: 13px; color: var(--text-dim); line-height: 1.9; }
.footer-meta a { color: inherit; text-decoration: none; }
.footer-meta a:hover { color: var(--gold-deep); }

/* ── Legal pages (privacy/terms) ── */
.legal {
  max-width: 780px; margin: 0 auto; padding: 64px 24px 96px;
}
.legal h1 { font-family: var(--serif); font-size: 2rem; color: var(--text); margin: 8px 0 6px; }
.legal .updated { color: var(--text-dim); font-size: 13.5px; margin: 0 0 40px; }
.legal h2 {
  font-size: 1.15rem; margin: 40px 0 12px; padding-top: 4px; color: var(--text);
}
.legal p, .legal li { font-size: 15px; color: var(--text-body); }
.legal ul { padding-left: 22px; }
.legal .back-link { display: inline-block; margin-bottom: 28px; font-size: 14px; color: var(--text-sub); text-decoration: none; }
.legal .back-link:hover { color: var(--gold-deep); }
.legal .callout {
  background: var(--gold-wash); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 20px; font-size: 14px; color: var(--text-sub); margin: 0 0 32px;
}

@media (max-width: 640px) {
  .nav-links { gap: 16px; }
  .hero { padding: 56px 0 40px; }
  section { padding: 48px 0; }
  .download-panel { padding: 28px; }
}