:root {
  --bg: #fafaf9;
  --fg: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --accent: #1d4ed8;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1917;
    --fg: #f5f5f4;
    --muted: #a8a29e;
    --line: #44403c;
    --accent: #93c5fd;
    --card: #292524;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 24px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
header .brand { font-weight: 700; font-size: 1.1rem; color: var(--fg); text-decoration: none; }
nav { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 16px; }
nav a { color: var(--accent); text-decoration: none; font-size: 0.95rem; }
nav a:hover { text-decoration: underline; }
main { padding-top: 24px; padding-bottom: 48px; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
.meta { color: var(--muted); font-size: 0.9rem; margin: 0 0 24px; }
a { color: var(--accent); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 16px 0;
}
.disclosure { font-size: 0.9rem; color: var(--muted); }
code, kbd { font-family: ui-monospace, Menlo, monospace; font-weight: 600; }
form label { display: block; margin: 12px 0 4px; font-weight: 600; }
form input[type=text], form input[type=tel] {
  width: 100%; padding: 8px 10px; font: inherit;
  border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg); color: var(--fg);
}
form .check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; margin-top: 16px; }
form .check input { margin-top: 5px; }
form button {
  margin-top: 16px; padding: 10px 18px; font: inherit; font-weight: 600;
  background: var(--accent); color: var(--bg); border: 0; border-radius: 6px; cursor: pointer;
}
footer { border-top: 1px solid var(--line); padding-top: 16px; padding-bottom: 32px; color: var(--muted); font-size: 0.85rem; }