/* shared.css — Styles dùng chung trên nhiều trang học sinh */

/* ── Math / KaTeX overflow (H-01 FIX F) ───────────────────────────────────── */
.katex-display { overflow-x: auto; overflow-y: hidden; }
.katex         { max-width: 100%; overflow-x: auto; }

/* ── Loading / Error / Empty states (H-03) ───────────────────────────────── */
.state-loading,
.state-error,
.state-empty {
  text-align: center;
  padding: var(--space-8, 32px) var(--space-4, 16px);
  border-radius: var(--radius-lg, 12px);
  font-size: var(--text-sm, 14px);
  line-height: 1.5;
}
.state-loading { color: var(--color-text-muted, #9ca3af); }
.state-error   {
  color: var(--color-danger, #E65100);
  background: var(--color-danger-soft, #FFF3E0);
  border-left: 4px solid var(--color-danger, #FF9800);
}
.state-empty   { color: var(--color-text-muted, #9ca3af); }

.state-loading::before {
  content: '';
  display: block;
  width: 28px;
  height: 28px;
  margin: 0 auto var(--space-3, 12px);
  border: 3px solid #E5E7EB;
  border-top-color: var(--color-primary, #1B5E20);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.state-empty .empty-icon {
  font-size: 36px;
  margin-bottom: var(--space-3, 12px);
}

.state-error .retry-btn {
  margin-top: var(--space-3, 12px);
  padding: 6px 16px;
  background: var(--color-danger, #FF9800);
  color: #fff;
  border: 0;
  border-radius: var(--radius-md, 8px);
  cursor: pointer;
  font-size: var(--text-sm, 14px);
  font-family: inherit;
}
.state-error .retry-btn:hover { background: var(--color-danger-strong, #F57C00); }

/* ── Offline banner + restore notice (H-05) ──────────────────────────────── */
.offline-banner {
  background: #FFF3E0;
  border-bottom: 2px solid #FF9800;
  padding: 10px 16px;
  text-align: center;
  color: #E65100;
  font-size: var(--text-sm, 14px);
  font-weight: 500;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.restore-notice {
  background: #E8F5E9;
  border-left: 4px solid #4CAF50;
  padding: 8px 16px;
  margin: 8px 0;
  border-radius: 4px;
  color: #2E7D32;
  font-size: var(--text-sm, 14px);
}

/* ── Quota header badge (Gap 1 — F6) ──────────────────────────────────────── */
.quota-header-badge {
  font-size: var(--text-xs);
  font-family: var(--font-body);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 500;
  line-height: 1.4;
}
.quota-header-badge--warn    { background: #FEF3C7; color: var(--color-semantic-warn, #EAB308); }
.quota-header-badge--degrade { background: #FEF3C7; color: var(--color-semantic-warn, #EAB308); }
.quota-header-badge--exhaust { background: var(--color-danger-bg, #FEE2E2); color: var(--color-semantic-error, #EF4444); }
.quota-header-badge--blocked { background: var(--color-danger-bg, #FEE2E2); color: var(--color-semantic-error, #EF4444); }

/* ── Recent activity section (Gap 2 — F6) ─────────────────────────────────── */
.recent-section { margin-top: var(--space-12); }
.recent-list    { display: flex; flex-direction: column; gap: var(--space-3); }
.recent-item {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4); padding: var(--space-4);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); text-decoration: none; color: inherit;
  transition: box-shadow var(--transition-fast);
}
.recent-item:hover { box-shadow: var(--shadow-sm); }
.recent-item__info { flex: 1; }
.recent-item__title { font-weight: 500; font-size: var(--text-base); color: var(--color-text); }
.recent-item__meta  { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: 2px; }
.recent-item__score {
  font-family: var(--font-display); font-size: var(--text-xl);
  color: var(--color-primary); font-weight: 400;
}
.recent-viewall { font-size: var(--text-sm); color: var(--color-accent); margin-top: var(--space-3); display: inline-block; }

/* ── Touch targets (H-04) — WCAG 2.5.5 minimum 44×44 on mobile ──────────── */
@media (max-width: 767px) {
  button,
  .btn,
  a.btn,
  .nav-item a,
  .tab-item,
  .retry-btn {
    min-height: 44px;
  }
  /* Inline anchors / icons should not be force-sized; only block-level buttons + nav */
  input[type="radio"],
  input[type="checkbox"] {
    min-width: 22px;
    min-height: 22px;
  }
}