:root {
  --bg: #f3f4f6; --panel: #ffffff; --fg: #1b1f24; --muted: #5b6470; --line: #d9dde3;
  --accent: #1f5f8b; --accent-fg: #ffffff; --bad: #b3261e;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121417; --panel: #1b1e23; --fg: #e8eaed; --muted: #9aa3ad; --line: #2f343b; --accent: #6fb0dd; --accent-fg: #0d1b26; --bad: #f2867f; color-scheme: dark; }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.5 var(--sans); display: grid; place-items: center; padding: 16px; }
.card { width: min(100%, 24rem); background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 28px; }
.brand { margin: 0; font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
h1 { margin: 4px 0 0; font: 400 28px/1.2 var(--serif); }
.lede { margin: 6px 0 20px; color: var(--muted); }
form { display: grid; gap: 6px; }
label { font-size: 13px; color: var(--muted); margin-top: 8px; }
input { font: inherit; color: inherit; background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 9px 10px; }
input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button { margin-top: 16px; font: inherit; font-weight: 600; background: var(--accent); color: var(--accent-fg); border: 0; border-radius: 6px; padding: 10px; cursor: pointer; }
button[disabled] { opacity: .6; cursor: wait; }
.error { margin: 8px 0 0; color: var(--bad); font-size: 14px; }