@media (max-width: 900px) {

  /* ── FIX 1: Slide-in hamburger nav drawer from LEFT ── */

  .site-header {
    height: 64px !important;
    position: fixed !important;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    overflow: visible !important;
  }

  .site-header .header-inner {
    height: 64px !important;
    display: flex !important;
    align-items: center !important;
    padding: 0 16px !important;
    gap: 0.75rem !important;
    overflow: visible !important;
    box-sizing: border-box !important;
    width: 100% !important;
  }

  /* Hamburger on the LEFT, fully visible */
  .site-header .hamburger {
    display: flex !important;
    flex-direction: column !important;
    justify-content: center !important;
    align-items: center !important;
    gap: 4px !important;
    width: 38px !important;
    height: 38px !important;
    flex-shrink: 0 !important;
    background: rgba(255, 255, 255, 0.1) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
    border-radius: 10px !important;
    cursor: pointer !important;
    padding: 8px !important;
    margin-left: 0 !important;
    z-index: 1100 !important;
    transition: all 0.2s ease !important;
  }

  .site-header .hamburger:active {
    background: rgba(255, 255, 255, 0.2) !important;
    transform: scale(0.95) !important;
  }

  .site-header .hamburger .bar {
    display: block !important;
    width: 22px !important;
    height: 2px !important;
    background: #ffffff !important;
    border-radius: 2px !important;
    transition: transform 0.3s ease, opacity 0.3s ease !important;
  }

  .site-header .hamburger.active .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg) !important;
  }
  .site-header .hamburger.active .bar:nth-child(2) {
    opacity: 0 !important;
    transform: scaleX(0) !important;
  }
  .site-header .hamburger.active .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg) !important;
  }

  /* Logo centered / fills remaining space */
  .logo {
    flex: 1 !important;
    margin: 0 !important;
  }

  /* Account button stays right */
  .account-btn {
    margin-left: auto !important;
    flex-shrink: 0 !important;
  }

  /* Nav drawer slides from LEFT now */
  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 998;
    backdrop-filter: blur(2px);
  }
  .nav-overlay.open { display: block; }

  .site-header .navbar {
    position: fixed !important;
    top: 64px !important;
    left: 0 !important;
    right: auto !important;
    width: 280px !important;
    height: calc(100vh - 64px) !important;
    background: #002244 !important;
    flex-direction: column !important;
    justify-content: flex-start !important;
    align-items: stretch !important;
    padding: 0.5rem 0 1rem !important;
    z-index: 999 !important;
    overflow-y: auto !important;
    transform: translateX(-100%) !important;
    transition: transform 0.32s cubic-bezier(0.4,0,0.2,1) !important;
    display: flex !important;
    box-shadow: 8px 0 32px rgba(0,0,0,0.35) !important;
  }

  .site-header .navbar.open {
    transform: translateX(0) !important;
  }

  .site-header .navbar::before {
    display: none !important;
  }

  .site-header .nav-menu {
    flex-direction: column !important;
    padding: 0.5rem 0 !important;
    width: 100% !important;
    list-style: none !important;
  }

  .site-header .nav-menu li { width: 100%; }

  .site-header .nav-menu li a {
    display: flex !important;
    padding: 0.85rem 1.5rem !important;
    font-size: 0.95rem !important;
    font-weight: 600 !important;
    color: rgba(255,255,255,0.88) !important;
    border-left: 3px solid transparent !important;
    text-decoration: none !important;
  }

  .site-header .nav-menu li a:hover,
  .site-header .nav-menu li a.active {
    color: #fff !important;
    background: rgba(255, 102, 0, 0.15) !important;
    border-left-color: #ff6600 !important;
  }

  .site-header .nav-dropdown-menu {
    display: none;
    background: rgba(0, 34, 68, 0.95) !important;
    list-style: none;
    padding: 0 !important;
    border-left: 3px solid rgba(255, 102, 0, 0.3) !important;
  }
  .site-header .nav-dropdown.open .nav-dropdown-menu { display: block !important; }

  .site-header .nav-dropdown-menu li a {
    padding: 0.8rem 1.5rem 0.8rem 3rem !important;
    font-size: 0.9rem !important;
    color: rgba(255,255,255,0.75) !important;
    border-left: none !important;
    border-bottom: 1px solid rgba(255,255,255,0.05) !important;
  }

  /* Legacy tutor mobile layout kept off the current tutor page */
  body:not(.tutor-page) .tutor-layout {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    bottom: auto !important;
    min-height: calc(100dvh - 64px) !important;
    height: calc(100dvh - 64px) !important;
    display: flex !important;
    flex-direction: column !important;
    overflow: hidden !important;
  }

  body:not(.tutor-page) .tutor-sidebar { display: none !important; }

  body:not(.tutor-page) .tutor-main {
    flex: 1 !important;
    display: flex !important;
    flex-direction: column !important;
    width: 100% !important;
    min-height: 0 !important;
    overflow: hidden !important;
    position: relative !important;
  }

  body:not(.tutor-page) .tutor-panel {
    display: none !important;
    flex-direction: column !important;
    position: relative !important;
    inset: auto !important;
    flex: 1 !important;
    min-height: 0 !important;
    overflow: hidden !important;
  }

  body:not(.tutor-page) .tutor-panel.active {
    display: flex !important;
  }

  body:not(.tutor-page) .chat-messages {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    bottom: auto !important;
    flex: 1 !important;
    min-height: 0 !important;
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch !important;
    padding: 1rem !important;
  }

  body:not(.tutor-page) .chat-input-bar {
    position: sticky !important;
    bottom: 0 !important;
    left: auto !important;
    right: auto !important;
    height: auto !important;
    min-height: 60px !important;
    padding: 0.75rem !important;
    padding-bottom: max(0.75rem, env(safe-area-inset-bottom)) !important;
    background: #f8fafc !important;
    border-top: 2px solid #e2e8f0 !important;
    display: flex !important;
    flex-direction: column !important;
    z-index: 20 !important;
    box-sizing: border-box !important;
  }

  body:not(.tutor-page) .chat-input-inner {
    display: flex !important;
    align-items: flex-end !important;
    width: 100% !important;
  }

  body:not(.tutor-page) .chat-input {
    font-size: 16px !important;
    flex: 1 !important;
    min-width: 0 !important;
  }

  body:not(.tutor-page) .mobile-tab-bar {
    display: flex !important;
    flex-shrink: 0 !important;
    width: 100% !important;
    z-index: 10 !important;
  }
}