:root {
  --primary: #263b78;
  --accent: #26a6a0;
  --text: #16213c;
  --secondary: #5d6575;
  --surface: #ffffff;
  --canvas: #f6f7fa;
}
@media (prefers-color-scheme: dark) {
  :root { --primary: #7c93db; --text: #f5f7fc; --secondary: #b8c0d0; --surface: #1c1d23; --canvas: #101115; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--canvas);
}
main {
  max-width: 520px;
  margin: 48px auto;
  padding: 32px 24px;
  background: var(--surface);
  border-radius: 18px;
}
@media (max-width: 560px) { main { margin: 16px; } }
.icon { border-radius: 20px; display: block; margin-bottom: 16px; }
h1 { margin: 0 0 8px; font-size: 28px; }
.code {
  font: 600 15px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace;
  word-break: break-all;
  padding: 12px;
  background: var(--canvas);
  border-radius: 12px;
}
button, .button {
  display: inline-block;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  border: 0;
  border-radius: 14px;
  padding: 12px 20px;
  text-decoration: none;
  cursor: pointer;
}
.hint { color: var(--secondary); font-size: 14px; }