:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1f2329;
  --muted: #646a73;
  --line: #e6e8ec;
  --accent: #e64355;
  --accent-soft: #fff0f2;
  --sidebar: #fbfcfd;
  --shadow: 0 12px 40px rgba(31, 35, 41, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

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

a:hover {
  text-decoration: underline;
}

.page-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 28px;
  width: min(1180px, calc(100% - 40px));
  margin: 28px auto 56px;
  align-items: start;
}

.doc-sidebar {
  position: sticky;
  top: 96px;
  max-height: calc(100vh - 124px);
  overflow: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--sidebar);
}

.sidebar-title {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.toc-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc-list a {
  display: block;
  padding: 7px 8px;
  border-radius: 6px;
  color: #3f4652;
  font-size: 14px;
  line-height: 1.45;
}

.toc-list a:hover {
  background: var(--accent-soft);
  text-decoration: none;
}

.doc-panel {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.doc-meta {
  padding: 42px 56px 24px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #fff8f9 0%, #ffffff 100%);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: 32px;
  line-height: 1.28;
  letter-spacing: 0;
}

.updated {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.doc-content {
  padding: 18px 56px 56px;
  word-break: break-word;
}

.doc-content h2 {
  margin: 34px 0 14px;
  padding-top: 8px;
  color: #14171f;
  font-size: 22px;
  line-height: 1.45;
  letter-spacing: 0;
}

.doc-content h3 {
  margin: 28px 0 10px;
  color: #20242d;
  font-size: 18px;
  line-height: 1.45;
  letter-spacing: 0;
}

.doc-content p {
  margin: 12px 0;
  color: #303642;
  font-size: 16px;
}

.doc-content strong {
  color: #14171f;
  font-weight: 800;
}

.doc-content ul,
.doc-content ol {
  margin: 10px 0 16px;
  padding-left: 24px;
}

.doc-content li {
  margin: 7px 0;
}

.doc-content .notice {
  margin: 18px 0;
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  background: var(--accent-soft);
}

.empty-state {
  padding: 36px 0;
  color: var(--muted);
}

@media (max-width: 860px) {
  .page-shell {
    display: block;
    width: min(100% - 28px, 680px);
    margin-top: 18px;
  }

  .doc-sidebar {
    position: static;
    max-height: none;
    margin-bottom: 16px;
  }

  .toc-list {
    grid-template-columns: 1fr 1fr;
  }

  .doc-meta {
    padding: 30px 22px 20px;
  }

  h1 {
    font-size: 26px;
  }

  .doc-content {
    padding: 12px 22px 34px;
  }

  .doc-content h2 {
    font-size: 20px;
  }
}

@media (max-width: 520px) {
  .toc-list {
    grid-template-columns: 1fr;
  }

  .doc-content p,
  .doc-content li {
    font-size: 15px;
  }
}