:root {
  --bg: #fbf8ff;
  --text: #1b1b21;
  --muted: #5d5e67;
  --primary: #2b59c3;
  --on-primary: #ffffff;
  --error: #ba1a1a;
  --card: #ffffff;
  --line: #d9d9e2;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131318;
    --text: #e4e1e9;
    --muted: #a9a8b3;
    --primary: #b1c5ff;
    --on-primary: #002c70;
    --error: #ffb4ab;
    --card: #1f1f25;
    --line: #3a3a42;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 1.7rem; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 1.2rem; margin: 28px 0 8px; }
a { color: var(--primary); }
code { font-size: 0.9em; overflow-wrap: anywhere; }
.muted { color: var(--muted); font-size: 0.9rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  margin: 16px 0;
}
label { display: block; font-size: 0.9rem; margin: 12px 0 4px; }
input {
  width: 100%;
  padding: 12px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}
button {
  margin-top: 16px;
  padding: 12px 20px;
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: 999px;
  background: var(--primary);
  color: var(--on-primary);
  cursor: pointer;
}
button.secondary { background: transparent; color: var(--primary); border: 1px solid var(--line); }
button.danger { background: var(--error); color: var(--bg); }
button:disabled { opacity: 0.5; cursor: default; }
.error { color: var(--error); }
[hidden] { display: none !important; }