:root { color-scheme: light dark; --bg: #f9f9f7; --surface: #fcfcfb; --ink: #0b0b0b; --ink2: #52514e; --line: #e1e0d9; --accent: #2a78d6; --bad: #d03b3b; }
@media (prefers-color-scheme: dark) { :root { --bg: #0d0d0d; --surface: #1a1a19; --ink: #ffffff; --ink2: #c3c2b7; --line: #2c2c2a; --accent: #3987e5; --bad: #ec835a; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--ink); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
.card { width: min(380px, calc(100vw - 32px)); background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 32px 28px 24px; }
.mark { color: var(--accent); margin-bottom: 8px; }
h1 { margin: 0; font-size: 22px; font-weight: 650; letter-spacing: -.01em; }
.sub { margin: 4px 0 20px; color: var(--ink2); font-size: 13px; }
label { display: block; font-size: 12px; font-weight: 600; color: var(--ink2); margin: 14px 0 6px; }
input { width: 100%; padding: 10px 12px; font: inherit; color: var(--ink); background: transparent; border: 1px solid var(--line); border-radius: 8px; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { width: 100%; margin-top: 20px; padding: 11px; font: inherit; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 8px; cursor: pointer; }
button:hover { filter: brightness(1.08); }
.err { margin: 0 0 4px; padding: 9px 12px; border-radius: 8px; font-size: 13px; color: var(--bad); border: 1px solid var(--bad); }
.foot { margin: 20px 0 0; font-size: 12px; color: var(--ink2); text-align: center; }