:root {
  --brand-primary: #1a4d8f;
  --brand-accent: #f39c12;
  --brand-background: #f4f7fb;
  --surface: #ffffff;
  --text: #1f2933;
  --text-muted: #5a6a7e;
  --border: #dde3ed;
  --radius-card: 1.25rem;
  --radius-btn: 0.6rem;
  --radius-input: 0.5rem;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: linear-gradient(145deg, #f0f4fa 0%, #e4ecf8 100%);
  min-height: 100dvh;
}

main {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

/* ── Auth shell ── */
.auth-shell {
  width: min(26rem, 100%);
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 2rem 1.75rem 1.75rem;
  box-shadow:
    0 1px 3px rgba(12, 20, 40, 0.06),
    0 8px 24px rgba(12, 20, 40, 0.08),
    0 24px 48px rgba(12, 20, 40, 0.06);
}

.auth-logo {
  display: block;
  max-height: 2.5rem;
  max-width: 10rem;
  object-fit: contain;
  margin-bottom: 1.25rem;
}

.auth-title {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.auth-subtitle {
  margin: 0 0 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ── Provider buttons ── */
.auth-providers {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 0.25rem;
}

.auth-providers form {
  margin: 0;
}

.provider-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  width: 100%;
  padding: 0.7rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-btn);
  background: var(--surface);
  color: var(--text);
  font-size: 0.925rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.provider-btn:hover {
  background: #f6f8fc;
  border-color: #b8c4d8;
  box-shadow: 0 2px 6px rgba(12, 20, 40, 0.07);
}

.provider-btn:active {
  background: #edf1f8;
}

.provider-btn svg {
  flex-shrink: 0;
}

/* ── Divider ── */
.auth-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1.25rem 0;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Native auth forms ── */
.auth-native-grid {
  display: grid;
  gap: 1rem;
}

.auth-form {
  display: grid;
  gap: 0.4rem;
  margin: 0;
}

.auth-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
}

.auth-input {
  width: 100%;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-input);
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--surface);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.auth-input:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand-primary) 15%, transparent);
}

.auth-btn-primary {
  width: 100%;
  padding: 0.7rem 1rem;
  border: none;
  border-radius: var(--radius-btn);
  background: var(--brand-primary);
  color: #fff;
  font-size: 0.925rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s, box-shadow 0.15s;
  margin-top: 0.25rem;
}

.auth-btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 12px color-mix(in srgb, var(--brand-primary) 35%, transparent);
}

.auth-btn-secondary {
  width: 100%;
  padding: 0.7rem 1rem;
  border: 1.5px solid var(--brand-primary);
  border-radius: var(--radius-btn);
  background: transparent;
  color: var(--brand-primary);
  font-size: 0.925rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  margin-top: 0.25rem;
}

.auth-btn-secondary:hover {
  background: color-mix(in srgb, var(--brand-primary) 8%, transparent);
}

/* ── Alerts ── */
.auth-demo-hint {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 0 0 1rem;
  padding: 0.65rem 0.75rem;
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--brand-primary) 8%, #ffffff);
  border: 1px solid color-mix(in srgb, var(--brand-primary) 20%, #ffffff);
  font-size: 0.875rem;
  color: color-mix(in srgb, var(--brand-primary) 80%, var(--text));
}

.auth-error {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 0 0 1rem;
  padding: 0.65rem 0.75rem;
  border-radius: 0.5rem;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  font-size: 0.875rem;
}

/* ── Home panel ── */
.home-panel {
  background: var(--surface);
  max-width: 44rem;
  width: 100%;
  padding: 2rem;
  border-radius: var(--radius-card);
  box-shadow: 0 8px 32px rgba(12, 20, 33, 0.09);
}

.home-panel h1 { margin-top: 0; }

.home-link {
  color: var(--brand-primary);
  font-weight: 700;
}

@media (max-width: 480px) {
  main { padding: 0.75rem; }
  .auth-card { padding: 1.5rem 1.25rem; }
}