:root {
  --bg: #ffffff;
  --card: #f7f7f9;
  --text: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --accent-contrast: #ffffff;
  --border: #e5e7eb;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0e14;
    --card: #121620;
    --text: #e6eaf2;
    --muted: #94a3b8;
    --accent: #6ea8fe;
    --accent-contrast: #04060a;
    --border: #1f2430;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji"; line-height: 1.6; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1060px, 92vw); margin: 0 auto; padding: 1.2rem; }
.site-header { background: var(--bg); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10; }
.flex-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: .6rem; font-weight: 700; font-size: 1.1rem; color: var(--text); }
.brand .dot { color: var(--accent); }
.logo { display: inline-block; }
.site-nav ul { display: flex; list-style: none; margin: 0; padding: 0; gap: .8rem; }
.site-nav a { padding: .5rem .7rem; border-radius: .6rem; }
.site-nav a.cta { background: var(--accent); color: var(--accent-contrast); }
.site-nav a.cta:hover { text-decoration: none; filter: brightness(1.05); }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 1rem; top: 1rem; background: var(--accent); color: var(--accent-contrast); padding: .5rem .7rem; border-radius: .5rem; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 1.1rem 1.2rem; box-shadow: var(--shadow); margin: 1rem 0; }
.h3 { font-size: 1.1rem; margin: 0 0 .6rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
@media (max-width: 820px){ .grid-2{ grid-template-columns: 1fr; } }
.button { display: inline-block; padding: .6rem .9rem; border-radius: .7rem; border: 1px solid var(--border); background: var(--bg); color: var(--text); font-weight: 600; }
.button.primary { background: var(--accent); color: var(--accent-contrast); border-color: transparent; }
.button:hover { text-decoration: none; filter: brightness(1.05); }
.small { font-size: .92rem; }
.muted { color: var(--muted); }
.site-footer { border-top: 1px solid var(--border); margin-top: 2rem; }
.tldr p { margin: .5rem 0; }
.glossary dt { font-weight: 700; margin-top: .8rem; }
.glossary dd { margin: .2rem 0 .6rem 0; color: var(--muted); }
.cta-row { display: flex; gap: .8rem; flex-wrap: wrap; align-items: center; }
.ad { display: grid; grid-template-columns: auto 1fr auto; gap: .8rem; align-items: center; padding: .8rem; border: 1px dashed var(--border); border-radius: 12px; background: var(--bg); }
.ad img { width: 28px; height: 28px; }
.ad .ad-text { font-weight: 600; }
.ad .ad-cta { padding: .4rem .7rem; background: var(--accent); color: var(--accent-contrast); border-radius: .5rem; }
.ad .ad-cta:hover { text-decoration: none; filter: brightness(1.05); }
.ad-fallback { display: inline-block; padding: .4rem .6rem; background: var(--accent); color: var(--accent-contrast); border-radius: .5rem; }