:root {
  --bg: #ffffff;
  --fg: #1a1a1f;
  --muted: #5a5a66;
  --faint: #8a8a96;
  --rule: #e4e4ea;
  --accent: #4b4bf0;
  --card: #f7f7fa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0b;
    --fg: #ededf0;
    --muted: #a8a8b4;
    --faint: #6e6e7a;
    --rule: #1d1d21;
    --accent: #8c8cff;
    --card: #131318;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 56px 22px 96px; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 6px; letter-spacing: -0.02em; }
h2 {
  font-size: 1.15rem; margin: 40px 0 12px; letter-spacing: -0.01em;
  padding-top: 20px; border-top: 1px solid var(--rule);
}
h3 { font-size: 1rem; margin: 24px 0 8px; }
p, li { color: var(--muted); }
li { margin-bottom: 6px; }
strong { color: var(--fg); font-weight: 600; }
a { color: var(--accent); }
.updated { color: var(--faint); font-size: 0.9rem; margin: 0 0 8px; }
.lang { font-size: 0.9rem; margin: 0 0 36px; }
.lead {
  background: var(--card); border-radius: 12px; padding: 18px 20px;
  margin: 28px 0 8px;
}
.lead p { margin: 0 0 10px; }
.lead p:last-child { margin-bottom: 0; }
.fill {
  background: #ffe9a8; color: #4a3800; padding: 1px 6px;
  border-radius: 4px; font-weight: 600;
}
@media (prefers-color-scheme: dark) {
  .fill { background: #4a3a00; color: #ffdf8a; }
}
table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 0.92rem; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { color: var(--fg); font-weight: 600; }
td { color: var(--muted); }
.tablewrap { overflow-x: auto; }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--rule); color: var(--faint); font-size: 0.85rem; }
footer a { color: var(--faint); }
.cta { margin: 26px 0 4px; }
.cta a {
  display: inline-block; padding: 13px 26px; border-radius: 999px;
  background: var(--accent); color: #fff; font-weight: 650;
  text-decoration: none; font-size: 1.02rem;
}
.cta p { margin: 10px 0 0; font-size: 0.88rem; color: var(--faint); }

/* --- guide pages --- */
nav.crumb { font-size: 0.88rem; margin: 0 0 26px; color: var(--faint); }
nav.crumb a { color: var(--faint); text-decoration: none; }
nav.crumb a:hover { text-decoration: underline; }
.answer {
  border-left: 3px solid var(--accent); background: var(--card);
  border-radius: 0 10px 10px 0; padding: 16px 18px; margin: 24px 0 8px;
}
.answer p { margin: 0 0 10px; color: var(--fg); }
.answer p:last-child { margin-bottom: 0; }
.answer .label {
  display: block; font-size: 0.75rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--faint); margin-bottom: 8px;
}
blockquote {
  margin: 16px 0; padding: 2px 0 2px 16px;
  border-left: 2px solid var(--rule); color: var(--fg); font-style: italic;
}
.related { background: var(--card); border-radius: 12px; padding: 16px 20px; margin: 36px 0 0; }
.related h2 { border: 0; padding: 0; margin: 0 0 10px; font-size: 1rem; }
.related ul { margin: 0; padding-left: 20px; }
.disclosure { font-size: 0.88rem; color: var(--faint); margin: 28px 0 0; }
.index-list { list-style: none; padding: 0; margin: 24px 0 0; }
.index-list li { margin-bottom: 20px; }
.index-list a { font-weight: 600; text-decoration: none; font-size: 1.05rem; }
.index-list a:hover { text-decoration: underline; }
.index-list p { margin: 4px 0 0; font-size: 0.94rem; }