:root {
  --bg: #0b0d12;
  --fg: #e8eaed;
  --muted: #9aa0a6;
  --accent: #5b8cff;
  --error: #ff6b6b;
  --card: #151822;
  --border: #2a2f3a;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6f8;
    --fg: #1a1d21;
    --muted: #5f6368;
    --accent: #2954d1;
    --error: #c0392b;
    --card: #ffffff;
    --border: #dadce0;
  }
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}
main.card {
  width: 100%;
  max-width: 26rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
}
h1 {
  font-size: 1.4rem;
  margin: 0 0 1.25rem;
}
label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}
input[type="email"],
input[type="password"],
select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--fg);
  font-size: 1rem;
}
input:focus,
select:focus {
  outline: 3px solid var(--accent);
  outline-offset: 1px;
}
button {
  width: 100%;
  padding: 0.7rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
button:focus-visible {
  outline: 3px solid var(--fg);
  outline-offset: 2px;
}
button:hover { filter: brightness(1.08); }
.error {
  background: color-mix(in srgb, var(--error) 15%, transparent);
  border: 1px solid var(--error);
  color: var(--error);
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}
.error:focus { outline: none; }
p.alt {
  margin-top: 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
  text-align: center;
}
p.alt a { color: var(--accent); }
.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
}
.skip-link:focus {
  position: fixed;
  left: 1rem;
  top: 1rem;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  z-index: 10;
}