:root {
  color-scheme: light dark;
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1c1f23;
  --muted: #5d6671;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --border: #d5dae1;
  --danger: #b42318;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --card: #1c2025;
    --text: #e8eaed;
    --muted: #9aa3ad;
    --accent: #5b8def;
    --accent-text: #0b1220;
    --border: #343a41;
    --danger: #ff8a80;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 24rem;
  padding: 2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
}

.brand { margin: 0 0 1rem; font-size: 1.5rem; letter-spacing: 0.02em; }
h2 { margin: 0 0 1rem; font-size: 1.125rem; }
p.muted, .muted { color: var(--muted); font-size: 0.9rem; }

label { display: block; margin: 0.75rem 0 0.25rem; font-size: 0.9rem; }

input[type="text"], input[type="email"], input[type="password"] {
  width: 100%;
  padding: 0.6rem 0.7rem;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}

input:focus-visible, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button {
  width: 100%;
  margin-top: 1.25rem;
  padding: 0.7rem 1rem;
  font: inherit;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: 0;
  border-radius: 0.5rem;
  cursor: pointer;
}

a { color: var(--accent); }

/* "Continue with <provider>": an outlined button above the password form, separated by "or". */
.external { margin: 0; }
.external button {
  margin-top: 0;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
}
.external button + button { margin-top: 0.5rem; }

.divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--border); }

.field-error, .validation-summary-errors { color: var(--danger); font-size: 0.875rem; }
.validation-summary-errors ul { margin: 0 0 0.5rem; padding-left: 1.1rem; }
.links { margin-top: 1rem; font-size: 0.9rem; }