:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --card-bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0071e3;
  --border: #d2d2d7;
  --error-bg: #fdecea;
  --error-text: #a4262c;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --card-bg: #2c2c2e;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #409cff;
    --border: #48484a;
    --error-bg: #3a1f1f;
    --error-text: #ff8a80;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 380px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
}

h1 {
  margin: 0 0 4px;
  font-size: 1.5rem;
}

.sub {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 0.9rem;
}

label {
  display: block;
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--muted);
}

input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
}

button,
.button {
  display: inline-block;
  width: 100%;
  margin-top: 8px;
  padding: 10px 12px;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  box-sizing: border-box;
}

.link-button {
  background: none;
  color: var(--accent);
  width: auto;
  padding: 4px;
}

.error {
  background: var(--error-bg);
  color: var(--error-text);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-bottom: 16px;
}