:root { color-scheme: light dark; --bg: #f4f5f7; --fg: #15171c; --card: #fff; --bd: #d5d8de; --ac: #1f6feb; }
@media (prefers-color-scheme: dark) { :root { --bg: #0f1115; --fg: #e8eaee; --card: #181b21; --bd: #2c313a; --ac: #5b9cff; } }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--fg); font: 15px/1.4 system-ui, sans-serif; }
main { box-sizing: border-box; background: var(--card); border: 1px solid var(--bd); border-radius: 12px; padding: 28px; width: min(360px, calc(100vw - 32px)); }
h1 { margin: 0 0 4px; font-size: 20px; } p { margin: 0 0 16px; opacity: .75; }
label { display: block; font-size: 13px; margin-bottom: 6px; }
input { width: 100%; box-sizing: border-box; padding: 10px; border-radius: 8px; border: 1px solid var(--bd); background: transparent; color: inherit; font-size: 15px; }
button { margin-top: 12px; width: 100%; padding: 10px; border: 0; border-radius: 8px; background: var(--ac); color: #fff; font-size: 15px; cursor: pointer; }
#m { margin: 10px 0 0; color: #d1242f; min-height: 1.2em; }
a.google { display: block; text-align: center; text-decoration: none; margin-top: 12px; padding: 10px; border-radius: 8px; background: var(--ac); color: #fff; font-size: 15px; }
details { margin-top: 16px; font-size: 13px; } summary { cursor: pointer; opacity: .75; }