:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #1c1f2e;
  --muted: #5b6072;
  --brand: #1b1f4b;
  --accent: #3b47d6;
  --border: #e3e5ee;
  --warn-bg: #fff4d6;
  --warn-text: #6b4e00;
  --danger: #c62828;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1120;
    --surface: #181b2e;
    --text: #e8e9f2;
    --muted: #a3a7bd;
    --brand: #0a0c1a;
    --accent: #8f98ff;
    --border: #2a2e47;
    --warn-bg: #3a2f10;
    --warn-text: #ffd978;
    --danger: #ff6b6b;
  }
}
* { 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;
}
header {
  background: var(--brand);
  color: #fff;
  padding: 20px 16px;
}
header .inner, main {
  max-width: 720px;
  margin: 0 auto;
}
header a { color: #fff; text-decoration: none; font-weight: 700; font-size: 18px; }
main { padding: 24px 16px 48px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 20px;
}
h1 { font-size: 26px; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 28px 0 8px; }
h3 { font-size: 16px; margin: 18px 0 4px; }
p, li { color: var(--text); }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 16px; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
a { color: var(--accent); }
.callout {
  background: var(--warn-bg);
  color: var(--warn-text);
  border-radius: 10px;
  padding: 12px 14px;
  margin: 16px 0;
}
.steps li { margin: 8px 0; }
.danger { color: var(--danger); font-weight: 600; }
/* Unfilled placeholder — deliberately loud so it can't ship unnoticed. */
.fill { background: var(--warn-bg); color: var(--warn-text); padding: 0 4px; border-radius: 4px; font-weight: 600; }
table { width: 100%; border-collapse: collapse; margin: 8px 0; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px 6px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; }
footer { color: var(--muted); font-size: 13px; text-align: center; margin-top: 24px; }