:root {
  --text: #2c3338;
  --text-secondary: #5c656c;
  --bg: #f6f4f1;
  --surface: #ffffff;
  --border: #e4ddd4;
  --accent: #3d6b5a;
  --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;
}

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

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

.doc-nav a:hover, 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; }

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;
  background: var(--surface);
}

th { font-weight: 600; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  background: #efeae3;
  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: #f3efe8;
    --text-secondary: #b7b1a8;
    --bg: #14181b;
    --surface: #1c2226;
    --border: #343c42;
    --accent: #8fc4a8;
  }

  code { background: #1c2226; }
}

@media (max-width: 480px) {
  .container { padding: 24px 16px 48px; }
  .site-header h1 { font-size: 24px; }
  table { font-size: 13px; }
  th, td { padding: 8px; }
}