/* Exam overlays and banners: loading, pause, offline/syncing, supervisor unlock, section card. */
@layer components {
  @keyframes spin { to { transform: rotate(360deg); } }

  .student-loading-overlay {
    align-items: center;
    background: oklch(var(--oklch-canvas));
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    inset: 0;
    justify-content: center;
    position: fixed;
    z-index: 9999;
  }
  .student-loading-spinner {
    animation: spin 0.8s linear infinite;
    block-size: 2.5rem;
    border: 3px solid oklch(var(--oklch-border));
    border-block-start-color: oklch(var(--oklch-accent, 0.55 0.2 250));
    border-radius: 50%;
    inline-size: 2.5rem;
  }
  .student-loading-text {
    color: oklch(var(--oklch-ink-mid));
    font-size: 0.9375rem;
  }

  .student-pause-overlay {
    align-items: center;
    background: oklch(15% 0 0);
    display: flex;
    inset: 0;
    justify-content: center;
    position: fixed;
    z-index: 10000;
  }
  .student-pause-overlay-content {
    color: oklch(95% 0 0);
    max-inline-size: 28rem;
    padding: var(--space-8);
    text-align: center;
  }
  .student-pause-overlay-heading {
    font-size: 2rem;
    font-weight: 700;
    margin-block-end: var(--space-6);
  }
  .student-pause-overlay-timer {
    align-items: center;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-block-end: var(--space-6);
  }
  .student-pause-overlay-timer-label {
    color: oklch(70% 0 0);
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
  }
  .student-pause-overlay-timer-value {
    font-size: 3.5rem;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
  }
  .student-pause-overlay-info {
    color: oklch(75% 0 0);
    font-size: 1rem;
    margin-block-end: var(--space-8);
  }
  .student-pause-overlay-resume {
    font-size: 1.25rem;
    padding: 1rem 2.5rem;
  }
  .student-pause-overlay-hint {
    color: oklch(55% 0 0);
    font-size: 0.8125rem;
    margin-block-start: var(--space-4);
  }

  /* Per-page wrapper */
  .student-page { display: contents; }

  /* Offline / syncing banner. States only set the --offline-banner-* properties. */
  .student-offline-banner {
    --offline-banner-background: light-dark(oklch(92% 0.08 70), oklch(0.30 0.06 70));
    --offline-banner-border-color: light-dark(oklch(78% 0.12 70), oklch(0.50 0.10 70));
    --offline-banner-color: light-dark(oklch(30% 0.06 70), oklch(0.88 0.08 70));

    align-items: center;
    background: var(--offline-banner-background);
    border: 1px solid var(--offline-banner-border-color);
    border-radius: var(--radius-md);
    color: var(--offline-banner-color);
    display: flex;
    font-size: 0.9rem;
    font-weight: 500;
    gap: 0.75rem;
    margin-block-end: var(--space-3);
    padding: 0.625rem 1rem;
    transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;

    &[data-state="syncing"] {
      --offline-banner-background: light-dark(oklch(93% 0.06 240), oklch(0.30 0.05 240));
      --offline-banner-border-color: light-dark(oklch(75% 0.1 240), oklch(0.50 0.08 240));
      --offline-banner-color: light-dark(oklch(28% 0.06 240), oklch(0.88 0.06 240));
    }
    &[data-state="synced"] {
      --offline-banner-background: light-dark(oklch(93% 0.07 150), oklch(0.30 0.05 150));
      --offline-banner-border-color: light-dark(oklch(75% 0.1 150), oklch(0.50 0.08 150));
      --offline-banner-color: light-dark(oklch(28% 0.06 150), oklch(0.88 0.08 150));
    }
    &[data-state="lockdown"] {
      --offline-banner-background: var(--lockdown-surface);
      --offline-banner-border-color: var(--lockdown-border-color);
      --offline-banner-color: var(--lockdown-text);
    }
  }
  .student-offline-banner-icon { flex-shrink: 0; }

  /* Lockdown red, shared by the lockdown banner state and the error toast */
  .student-offline-banner,
  .student-exam-toast {
    --lockdown-border-color: light-dark(oklch(70% 0.15 25), oklch(0.50 0.12 25));
    --lockdown-surface: light-dark(oklch(93% 0.1 25), oklch(0.30 0.07 25));
    --lockdown-text: light-dark(oklch(28% 0.08 25), oklch(0.88 0.08 25));
  }

  /* Inline error toast, replaces alert() for exam-taking JS errors (High #9) */
  .student-exam-toast {
    background: var(--lockdown-surface);
    border: 1px solid var(--lockdown-border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px oklch(0% 0 0 / 15%);
    color: var(--lockdown-text);
    font-size: 0.9rem;
    font-weight: 500;
    inset-block-end: var(--space-3);
    inset-inline-start: 50%;
    padding: 0.625rem 1rem;
    position: fixed;
    transform: translateX(-50%);
    z-index: 1000;
  }

  /* Supervisor unlock dialog (issue #386) */
  .student-unlock-dialog {
    align-items: center;
    background: oklch(0% 0 0 / 0.5);
    display: flex;
    inset: 0;
    justify-content: center;
    position: fixed;
    z-index: 1000;
  }
  .student-unlock-dialog-content {
    background: oklch(var(--oklch-canvas-raised));
    border-radius: var(--radius-md);
    box-shadow: 0 10px 40px oklch(0% 0 0 / 0.25);
    inline-size: 90%;
    max-inline-size: 22rem;
    padding: var(--space-5);

    input[type="password"] {
      border: 1px solid oklch(var(--oklch-border));
      border-radius: var(--radius-sm);
      inline-size: 100%;
      margin-block: var(--space-3);
      margin-inline: 0;
      padding: 0.5rem 0.75rem;
    }
  }
  .student-unlock-dialog-error {
    color: light-dark(oklch(50% 0.2 25), var(--color-danger-text));
    font-size: 0.875rem;
    margin-block-end: var(--space-3);
  }
  .student-unlock-dialog-actions {
    display: flex;
    gap: 0.5rem;
  }

  /* Section info card, shown before the first question of each section. Bleeds through
     the main area's inline padding (see .student-attempt-main). */
  .student-section-card {
    --section-card-bleed: var(--space-5);

    background: oklch(var(--oklch-canvas-raised));
    border: 1px solid oklch(var(--oklch-border));
    border-inline: none;
    border-radius: 0;
    inline-size: calc(100% + var(--section-card-bleed) * 2);
    margin-block-end: var(--space-4);
    margin-inline: calc(var(--section-card-bleed) * -1);
    padding: 1.25rem 2rem;

    @media (max-width: 640px) { --section-card-bleed: var(--space-3); }
  }
  .student-section-name {
    color: oklch(var(--oklch-ink-darkest));
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 0.25rem;
  }
  .student-section-instructions {
    color: oklch(var(--oklch-ink-dark));
    font-size: 0.9375rem;
    line-height: 1.65;
    margin-block-start: 0.5rem;
  }
}