:root {
  color-scheme: light;
  --page: #f9f9f7; --surface: #fcfcfb; --ink: #0b0b0b; --ink2: #52514e; --muted: #898781;
  --line: rgba(11,11,11,0.10); --accent: #2a78d6; --bad: #d03b3b;
}
@media (prefers-color-scheme: dark) {
  :root { color-scheme: dark; --page: #0d0d0d; --surface: #1a1a19; --ink: #f0efec; --ink2: #c3c2b7;
          --line: rgba(255,255,255,0.10); --accent: #3987e5; --bad: #e66767; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
       background: var(--page); color: var(--ink);
       font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; }
.card { width: 100%; max-width: 340px; background: var(--surface); border: 1px solid var(--line);
        border-radius: 14px; padding: 28px 24px; }
h1 { margin: 0; font-size: 22px; letter-spacing: -0.01em; }
.sub { margin: 2px 0 22px; color: var(--ink2); }
label { display: block; font-size: 13px; color: var(--ink2); margin-bottom: 6px; }
input { width: 100%; font: inherit; font-size: 16px; padding: 11px 12px;
        border-radius: 10px; border: 1px solid var(--line); background: var(--page); color: var(--ink); }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { width: 100%; margin-top: 14px; font: inherit; font-weight: 600; padding: 11px; border: 0;
         border-radius: 10px; background: var(--accent); color: #fff; cursor: pointer; }
button:disabled, input:disabled { opacity: 0.5; cursor: not-allowed; }
.msg { color: var(--bad); margin: 10px 0 0; font-size: 14px; }
[hidden] { display: none !important; }