:root {
  --bg: #f6f1e7;
  --bg-soft: #fbf7f0;
  --paper: #fffdf8;
  --line: #e6dac7;
  --line-strong: #d5c0a2;
  --text: #2f2a24;
  --text-soft: #5f5547;
  --accent: #9a5b2f;
  --accent-deep: #6f3f1e;
  --shadow: 0 12px 36px rgba(95, 70, 40, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(201, 160, 97, 0.14), transparent 26%),
    radial-gradient(circle at bottom right, rgba(146, 82, 39, 0.08), transparent 28%),
    linear-gradient(180deg, var(--bg-soft), var(--bg));
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.8;
  -webkit-text-size-adjust: 100%;
}

a {
  color: var(--accent-deep);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page-shell {
  min-height: 100vh;
  padding: 32px 20px 48px;
}

.page-frame {
  max-width: 960px;
  margin: 0 auto;
}

.hero {
  padding: 32px clamp(20px, 4vw, 40px);
  border: 1px solid rgba(154, 91, 47, 0.14);
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(255, 250, 243, 0.96), rgba(249, 239, 223, 0.94));
  box-shadow: var(--shadow);
}

.hero__eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero__title {
  margin: 0;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.2;
  color: #2b1d12;
}

.hero__meta {
  margin: 14px 0 0;
  color: var(--text-soft);
  font-size: 1rem;
}

.top-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.nav-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--accent-deep);
  font-weight: 600;
}

.nav-pill.is-active {
  border-color: var(--accent);
  background: linear-gradient(180deg, #fff3dc, #f6dfbb);
  color: #5a3014;
}

.doc {
  margin-top: 24px;
}

.section-card,
.note-card {
  margin-top: 18px;
  padding: 24px clamp(18px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper);
  box-shadow: 0 6px 20px rgba(82, 60, 36, 0.06);
}

.section-card:first-child,
.note-card:first-child {
  margin-top: 0;
}

.section-card h2,
.note-card h2 {
  margin: 0 0 14px;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  line-height: 1.35;
  color: #342114;
}

.section-card p,
.note-card p {
  margin: 0 0 12px;
}

.section-card p:last-child,
.note-card p:last-child {
  margin-bottom: 0;
}

.section-card ol,
.section-card ul {
  margin: 0;
  padding-left: 1.3rem;
}

.section-card li + li {
  margin-top: 10px;
}

.section-card ul ul,
.section-card ol ul {
  margin-top: 10px;
}

.lead {
  font-size: 1.03rem;
  color: var(--text-soft);
}

.disclaimer {
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  background: #fbf1df;
  color: #4f3826;
}

.sdk-list {
  display: grid;
  gap: 16px;
}

.sdk-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, #fffdf8, #fbf6ee);
}

.sdk-card h3 {
  margin: 0 0 12px;
  font-size: 1.05rem;
  line-height: 1.5;
  color: #3f2918;
}

.sdk-meta {
  margin: 0;
  padding-left: 1.2rem;
}

.sdk-meta li + li {
  margin-top: 10px;
}

.contact-link {
  word-break: break-all;
}

.page-footer {
  margin-top: 24px;
  padding: 20px 8px 0;
  color: var(--text-soft);
  font-size: 0.94rem;
  text-align: center;
}

@media (max-width: 720px) {
  .page-shell {
    padding: 16px 12px 28px;
  }

  .hero {
    padding: 24px 18px;
    border-radius: 18px;
  }

  .section-card,
  .note-card {
    padding: 18px 16px;
    border-radius: 16px;
  }

  .top-links {
    gap: 10px;
  }

  .nav-pill {
    width: 100%;
  }
}

@media print {
  body {
    background: #ffffff;
  }

  .page-shell {
    padding: 0;
  }

  .hero,
  .section-card,
  .note-card {
    box-shadow: none;
  }
}