/* Shared style for guide pages: single reading column */
:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --fg: #1d2530;
  --muted: #4f5a68;
  --line: #d8dee6;
  --brand: #1f5fa8;
  --brand-fg: #ffffff;
  --tip-bg: #eaf2fc;
  --ui-font: "DM Sans", "Segoe UI", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12171d; --panel: #1b222b; --fg: #e4e9ef; --muted: #a7b2bf; --line: #2e3844;
    --brand: #5b9ae6; --brand-fg: #0d1520; --tip-bg: #1a2a3d; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--ui-font); font-size: 17px; line-height: 1.7; }
a { color: var(--brand); }
.top { background: var(--panel); border-bottom: 1px solid var(--line); padding: 12px 16px; }
.top nav { max-width: 760px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: center; font-size: 15px; }
.top nav .home { font-weight: 700; color: var(--fg); text-decoration: none; margin-right: auto; display: inline-flex; align-items: center; gap: 8px; }
.top nav .home .logo { width: 28px; height: 28px; border-radius: 7px; flex: none; }
main { max-width: 760px; margin: 0 auto; padding: 28px 16px 40px; }
h1 { font-size: clamp(28px, 5vw, 38px); line-height: 1.2; margin: 0 0 10px; text-wrap: balance; }
.byline { font-size: 14px; color: var(--muted); margin: 0 0 12px; }
.byline a { font-weight: 700; text-decoration: none; }
.lead { font-size: 19px; color: var(--muted); margin: 0 0 22px; }
h2 { font-size: 24px; margin: 34px 0 8px; text-wrap: balance; }
h3 { font-size: 19px; margin: 22px 0 6px; }
p, li { color: var(--muted); }
li { margin-bottom: 6px; }
strong { color: var(--fg); }
.cta {
  display: inline-block; background: var(--brand); color: var(--brand-fg);
  padding: 12px 22px; border-radius: 8px; font-weight: 700; text-decoration: none; margin: 6px 0 10px;
}
.tip { background: var(--tip-bg); border-radius: 8px; padding: 14px 18px; margin: 18px 0; }
.tip p { margin: 0; color: var(--fg); }
.example { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 14px 18px; overflow-x: auto; }
.example p { margin: 4px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
.table-wrap { overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--panel); color: var(--fg); }
td { color: var(--muted); }
.related { border-top: 1px solid var(--line); margin-top: 40px; padding-top: 14px; }
footer { padding: 20px 16px; text-align: center; border-top: 1px solid var(--line); background: var(--panel); color: var(--muted); font-size: 15px; }
footer a { font-weight: 700; text-decoration: none; }
@media (max-width: 640px) {
  body { font-size: 16px; }
  main { padding: 20px 16px 32px; }
  .lead { font-size: 17px; }
  h2 { font-size: 21px; margin-top: 28px; }
  .cta { display: block; text-align: center; }
  .top nav a { padding: 4px 0; }
  table { font-size: 14px; }
  th, td { padding: 6px 8px; }
}