/* ===================================================================
   Responsive CSS - Mobile-First Media Queries
   =================================================================== */

/* ─── Tablet (768px and below) ────────────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  /* Navbar */
  .nav-menu {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 12px;
    flex-direction: column;
    gap: 4px;
    box-shadow: var(--shadow-lg);
    z-index: 999;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-link {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 15px;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-actions .btn {
    padding: 8px 16px;
    font-size: 13px;
  }

  /* Hero */
  .hero-content {
    grid-template-columns: 1fr;
    gap: 36px;
    text-align: center;
  }

  .hero-subtitle {
    margin: 0 auto 36px;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-visual {
    order: -1;
  }

  .hero-card {
    max-width: 340px;
  }

  /* Sections */
  .section {
    padding: 56px 16px;
  }

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

  /* Steps */
  .steps-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .steps-grid::before {
    display: none;
  }

  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  /* Forms */
  .form-row,
  .form-row-3 {
    grid-template-columns: 1fr;
  }

  /* Why grid */
  .why-grid {
    grid-template-columns: 1fr;
  }

  /* Table */
  .table {
    min-width: 700px;
  }

  /* Cards stacking */
  .admin-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Hero stats */
  .hero-stats {
    margin-top: 32px;
  }

  /* Pricing */
  .pricing-card {
    padding: 32px 24px;
  }

  .pricing-amount {
    font-size: 56px;
  }

  /* Success card */
  .success-card {
    padding: 32px 24px;
  }

  /* Modal */
  .modal {
    padding: 24px;
  }

  .modal-actions {
    flex-direction: column-reverse;
  }

  .modal-actions .btn {
    width: 100%;
  }

  /* Auth */
  .auth-card-header,
  .auth-card-body {
    padding: 24px;
  }

  /* Student info grid */
  .student-info-grid {
    grid-template-columns: 1fr;
  }
}

/* ─── Mobile (480px and below) ────────────────────────────────────── */
@media (max-width: 480px) {
  html { font-size: 15px; }

  /* Hero */
  .hero {
    padding: calc(var(--nav-height) + 24px) 16px 48px;
  }

  .hero-stats {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .hero-stat {
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    padding: 12px 16px;
  }

  .hero-stat-value {
    font-size: 20px;
  }

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

  /* Steps */
  .steps-grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  /* Buttons */
  .btn-lg {
    padding: 12px 24px;
    font-size: 15px;
  }

  /* Hero CTA */
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .hero-cta .btn {
    width: 100%;
    max-width: 300px;
  }

  /* Table */
  .table th,
  .table td {
    padding: 10px 12px;
    font-size: 13px;
  }

  /* Admin stats */
  .admin-stats-grid {
    grid-template-columns: 1fr;
  }

  /* Nav */
  .nav-actions .btn-outline {
    display: none;
  }

  /* Sections */
  .section {
    padding: 48px 16px;
  }

  .section-header {
    margin-bottom: 36px;
  }

  /* Card */
  .card-body {
    padding: 16px;
  }

  .card-header {
    padding: 14px 16px;
  }
}

/* ─── Extra small (375px and below) ──────────────────────────────── */
@media (max-width: 375px) {
  .nav-logo {
    font-size: 18px;
  }

  .hero-title {
    font-size: 1.9rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .registration-steps-bar {
    display: none;
  }

  .admin-content {
    padding: 12px;
  }
}

/* ─── Large Screens (1280px+) ─────────────────────────────────────── */
@media (min-width: 1280px) {
  .hero-content {
    gap: 80px;
  }

  .section {
    padding: 96px 24px;
  }
}

/* ─── Admin Sidebar Mobile ────────────────────────────────────────── */
@media (max-width: 1024px) {
  .admin-layout {
    flex-direction: column;
  }

  .admin-sidebar {
    width: 100%;
    height: auto;
    position: relative;
    transform: none;
  }

  .admin-sidebar.collapsed {
    display: none;
  }

  .admin-sidebar-toggle {
    display: flex !important;
  }

  .admin-main {
    margin-left: 0 !important;
  }
}

/* ─── Print Styles ────────────────────────────────────────────────── */
@media print {
  .navbar,
  .admin-sidebar,
  .btn,
  .toast-container {
    display: none !important;
  }

  body {
    background: white;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}