:root { --bg: #f6f7f9; --card: #fff; --text: #14161a; --muted: #5d6470; --accent: #1f6feb; --danger: #c93c37; --border: #e3e6ea; }
@media (prefers-color-scheme: dark) { :root { --bg: #0f1115; --card: #181b21; --text: #eef0f3; --muted: #9aa3ae; --accent: #4c8dff; --danger: #ff6b66; --border: #2a2f37; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px; background: var(--bg); color: var(--text); font: 16px/1.5 system-ui, -apple-system, sans-serif; }
main { width: 100%; max-width: 420px; background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 28px; }
h1 { font-size: 1.35rem; margin: 0 0 8px; }
p { margin: 0 0 16px; color: var(--muted); }
ul { margin: 0 0 20px; padding-left: 20px; }
button, .button { display: block; width: 100%; padding: 12px; margin-top: 10px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--text); font: inherit; font-weight: 600; text-align: center; text-decoration: none; cursor: pointer; }
.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.error { color: var(--danger); }
[hidden] { display: none !important; }