:root {
  --bg: #f6f7f9; --card: #ffffff; --text: #16181d; --muted: #5b6270;
  --line: #e3e6eb; --accent: #1f5eff;
  --warn-bg: #fff6e0; --warn-text: #6b4a00;
  --info-bg: #e8f1ff; --info-text: #123a73;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --card: #171a21; --text: #e9ecf1; --muted: #9aa3b2;
    --line: #262b35; --accent: #7aa2ff;
    --warn-bg: #3a2e10; --warn-text: #ffd98a;
    --info-bg: #13233d; --info-text: #b9d3ff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px; }

/* Header */
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 18px; padding-bottom: 18px; }
.brand { font-weight: 700; font-size: 20px; letter-spacing: -0.01em; color: var(--text); text-decoration: none; }
.site-nav { display: flex; gap: 18px; font-size: 15px; }
.site-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text); }

/* Hero */
.hero { padding: 12px 0 24px; }
.hero h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 10px; }
.hero p { color: var(--muted); font-size: 18px; margin: 0; max-width: 620px; }

/* Banners */
.banner { border-radius: 10px; padding: 12px 14px; margin: 0 0 12px; font-size: 14px; }
.banner.warn { background: var(--warn-bg); color: var(--warn-text); }
.banner.info { background: var(--info-bg); color: var(--info-text); }
.banner a { color: inherit; }

/* Swap layout */
.layout { display: grid; grid-template-columns: minmax(0, 470px) minmax(0, 1fr); gap: 32px; align-items: start; }
#widget { width: 100%; min-height: 640px; }
#widget iframe { border: 0; border-radius: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
.card h2 { font-size: 16px; margin: 0 0 12px; }
.card ol, .card ul { margin: 0; padding-left: 20px; }
.card li { margin-bottom: 10px; }
.card .fine { color: var(--muted); font-size: 14px; margin: 16px 0 0; }

/* Sections */
.section { padding: 40px 0 0; }
.section h2 { font-size: 22px; margin: 0 0 14px; letter-spacing: -0.01em; }
.guide-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.guide-card { display: block; text-decoration: none; color: var(--text); }
.guide-card h3 { font-size: 17px; margin: 0 0 6px; }
.guide-card p { color: var(--muted); font-size: 15px; margin: 0; }
.guide-card:hover { border-color: var(--accent); }

/* Article pages */
.article { max-width: 720px; padding-bottom: 16px; }
.article h1 { font-size: clamp(26px, 4.5vw, 36px); line-height: 1.2; letter-spacing: -0.02em; margin: 8px 0 12px; }
.article .lede { color: var(--muted); font-size: 18px; margin: 0 0 24px; }
.article h2 { font-size: 21px; margin: 32px 0 10px; }
.article h3 { font-size: 17px; margin: 22px 0 6px; }
.article li { margin-bottom: 8px; }
.article .callout { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 10px; padding: 14px 16px; margin: 20px 0; }
.article .cta { display: inline-block; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600; padding: 12px 18px; border-radius: 10px; margin-top: 8px; }
@media (prefers-color-scheme: dark) { .article .cta { color: #0f1115; } }
.updated { color: var(--muted); font-size: 14px; }

/* Footer */
.site-footer { color: var(--muted); font-size: 13px; padding-top: 48px; padding-bottom: 32px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 10px; }
.site-footer a { color: inherit; }

@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; }
  .site-nav { gap: 14px; font-size: 14px; }
}