:root { color-scheme: light; --bg:#f3f6f8; --card:#ffffff; --line:#d6dfe5; --ink:#10202b; --ink2:#465a68; --accent:#0f6e8c; --onaccent:#ffffff; --err:#d03b3b; }
@media (prefers-color-scheme: dark) { :root { color-scheme: dark; --bg:#0f171d; --card:#16212a; --line:#2a3945; --ink:#e9f0f4; --ink2:#a9bac6; --accent:#4cb6d6; --onaccent:#0f171d; --err:#e66767; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg); color: var(--ink); font: 16px/1.4 system-ui, -apple-system, 'Segoe UI', sans-serif; padding: 16px; }
.box { width: 100%; max-width: 360px; background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 28px 22px; }
.brand { font-size: 26px; font-weight: 800; letter-spacing: -.01em; }
.sub { margin: 4px 0 22px; color: var(--ink2); font-size: 14px; }
label { display: block; font-size: 13px; color: var(--ink2); margin-bottom: 6px; }
input { width: 100%; min-height: 48px; border-radius: 12px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); font-size: 16px; padding: 0 14px; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.err { min-height: 20px; margin: 8px 0; color: var(--err); font-size: 13px; }
button { width: 100%; min-height: 48px; border: 0; border-radius: 12px; background: var(--accent); color: var(--onaccent); font-size: 16px; font-weight: 700; cursor: pointer; }