:root {
  --bg: #0f0f12;
  --card: #17171c;
  --text: #ececf1;
  --muted: #a0a0ad;
  --accent: #7f77dd;
  --accent-2: #9648e8;
  --border: #26262e;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f7fb; --card: #ffffff; --text: #1c1c22; --muted: #5f5f6b;
    --accent: #5b4ff0; --accent-2: #8b3fe8; --border: #e5e5ee;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 760px; margin: 0 auto; padding: 32px 22px 72px; }
.site-header { display: flex; align-items: center; gap: 12px; margin-bottom: 40px; }
.logo {
  width: 40px; height: 40px; border-radius: 10px; flex: none;
  background: linear-gradient(160deg, var(--accent), var(--accent-2));
  color: #fff; font-weight: 600; display: flex; align-items: center; justify-content: center;
}
.brand a { color: var(--text); text-decoration: none; font-weight: 600; font-size: 18px; }
h1 { font-size: 34px; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 20px; margin: 40px 0 14px; letter-spacing: -0.01em; }
h3 { font-size: 16px; margin: 0 0 8px; }
.lead { color: var(--muted); font-size: 18px; margin: 0 0 6px; }
.effective { color: var(--muted); font-size: 14px; margin: 0 0 28px; }
a { color: var(--accent); }
.tldr {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 18px 20px; margin: 8px 0 12px;
}
.tldr h3 { color: var(--accent); }
.qa { border-top: 1px solid var(--border); padding: 16px 0; }
.qa .q { font-weight: 600; margin-bottom: 6px; }
.qa .a, .qa .a p { color: var(--muted); margin: 0 0 8px; }
.qa .a strong { color: var(--text); }
.back-home { display: inline-block; color: var(--muted); text-decoration: none; margin-bottom: 22px; }
.site-footer {
  margin-top: 56px; padding-top: 22px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 14px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.site-footer .links a { margin-right: 16px; text-decoration: none; }