:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #667eea;
  --accent-2: #764ba2;
  --on-accent: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111114;
    --card: #1c1c20;
    --text: #f5f5f7;
    --muted: #a1a1a6;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
.card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  text-align: center;
}
.brand {
  padding: 28px 20px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: var(--on-accent);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.body { padding: 28px 24px 32px; }
h1 { margin: 0 0 12px; font-size: 22px; }
p { margin: 0 0 24px; color: var(--muted); }
.button {
  display: inline-block;
  min-width: 220px;
  padding: 14px 32px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  text-decoration: none;
}
.link { color: var(--accent); font-size: 14px; }
[hidden] { display: none !important; }