:root {
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --bg: #ffffff;
  --border: #e5e5ea;
  --accent: #0071e3;
  --max-width: 720px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0 24px;
  margin-bottom: 32px;
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.25;
}

.meta {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 0 0 16px;
}

.lang-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 14px;
}

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

.lang-nav a:hover {
  text-decoration: underline;
}

.lang-nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  pointer-events: none;
}

.doc-nav {
  margin-top: 12px;
  font-size: 14px;
}

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

.doc-nav a:hover {
  text-decoration: underline;
}

.intro {
  margin-bottom: 32px;
}

section {
  margin-bottom: 32px;
}

h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 12px;
  padding-top: 8px;
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 20px 0 8px;
}

p {
  margin: 0 0 12px;
}

ul, ol {
  margin: 0 0 12px;
  padding-left: 1.4em;
}

li {
  margin-bottom: 6px;
}

strong {
  font-weight: 600;
}

a {
  color: var(--accent);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 16px;
  font-size: 14px;
}

th, td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f5f5f7;
  font-weight: 600;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  background: #f5f5f7;
  padding: 2px 6px;
  border-radius: 4px;
}

.contact-block {
  margin-top: 8px;
}

.site-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 13px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --text-secondary: #a1a1a6;
    --bg: #000000;
    --border: #38383a;
    --accent: #2997ff;
  }

  th {
    background: #1c1c1e;
  }

  code {
    background: #1c1c1e;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 24px 16px 48px;
  }

  .site-header h1 {
    font-size: 24px;
  }

  table {
    font-size: 13px;
  }

  th, td {
    padding: 8px;
  }
}