/* ========================================
   Mobile & Tablet Responsive
   ======================================== */

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    gap: 0.25rem;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-user {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero {
    padding: 3rem 1rem;
  }

  .hero-stats {
    gap: 1.5rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .dashboard-header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .dashboard-bottom {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .subjects-grid {
    grid-template-columns: 1fr;
  }

  .levels-grid {
    grid-template-columns: 1fr;
  }

  .lesson-nav {
    flex-direction: column;
  }

  .tf-options {
    flex-direction: column;
  }

  .results-actions {
    flex-direction: column;
    align-items: center;
  }

  .progress-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .streak-card {
    flex-wrap: wrap;
  }

  .page-title {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .page-container {
    padding: 1rem;
  }

  .auth-card {
    padding: 1.5rem;
  }

  .exercise-card, .quiz-question {
    padding: 1.5rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .big-score {
    font-size: 3.5rem;
  }

  .score-number {
    font-size: 3rem;
  }
}