body, html {
      height: 100%;
      margin: 0;
      padding: 0;
    }
    
    /* شريط التنقل */
    .custom-navbar {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.2);
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1000;
      transition: all 0.3s ease;
    }
    
    .navbar-brand {
      color: white !important;
      font-size: 1.8rem;
      font-weight: bold;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    
    .navbar-brand:hover {
      color: #00bcd4 !important;
      transform: scale(1.05);
      transition: all 0.3s ease;
    }
    
    .navbar-nav .nav-link {
      color: rgba(255, 255, 255, 0.9) !important;
      font-weight: 500;
      text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
      margin: 0 0.5rem;
      padding: 0.5rem 1rem !important;
      border-radius: 10px;
      transition: all 0.3s ease;
    }
    
    .navbar-nav .nav-link:hover {
      color: white !important;
      background: rgba(255, 255, 255, 0.15);
      transform: translateY(-2px);
    }
    
    .navbar-toggler {
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: white;
    }
    
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='m4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    
    /* خلفية الصفحة */
    .bg-cover {
      background-image: url('intro.jpg');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      min-height: 100vh;
      position: relative;
      padding-top: 80px; /* مساحة لشريط التنقل */
    }
    
    .overlay {
      position: absolute;
      inset: 0;
      background: rgba(0, 0, 0, 0.3);
    }
    
    .content {
      position: relative;
      z-index: 2;
      color: white;
    }
    
    h1 {
      font-size: 3rem;
      background: rgba(255, 255, 255, 0.15);
      backdrop-filter: blur(10px);
      border-radius: 15px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: white;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }
    
    /* استجابة للشاشات الصغيرة */
    @media (max-width: 768px) {
      .navbar-brand {
        font-size: 1.4rem;
      }
      
      .bg-cover {
        padding-top: 70px;
      }
      
      h1 {
        font-size: 2rem;
        padding: 1rem !important;
        margin-bottom: 2rem !important;
      }
      
      .container {
        padding: 1rem !important;
      }
      
      .card {
        margin-bottom: 1.5rem;
      }
      
      .card-img-top {
        height: 200px;
        object-fit: cover;
      }
      
      .btn {
        padding: 0.75rem 1rem;
        font-size: 1rem;
      }
    }
    
    @media (max-width: 576px) {
      .navbar-brand {
        font-size: 1.2rem;
      }
      
      h1 {
        font-size: 1.5rem;
        padding: 0.75rem !important;
      }
      
      .card-body {
        padding: 1rem;
      }
      
      .card-title {
        font-size: 1.25rem;
      }
      
      .card-text {
        font-size: 0.9rem;
      }
      
      .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
      }
    }
    
    .card {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(15px);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 20px;
      transition: all 0.3s ease;
    }
    
    .card:hover {
      background: rgba(255, 255, 255, 0.2);
      transform: translateY(-5px);
      box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    }
    
    .card-body {
      color: white;
    }
    
    .card-title {
      color: #fff;
      text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
      font-weight: bold;
    }
    
    .card-text {
      color: rgba(255, 255, 255, 0.9);
      text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    }
    
    .btn-primary {
      background: rgba(13, 110, 253, 0.8);
      border: 1px solid rgba(13, 110, 253, 0.6);
      backdrop-filter: blur(10px);
      transition: all 0.3s ease;
    }
    
    .btn-primary:hover {
      background: rgba(13, 110, 253, 1);
      transform: scale(1.05);
      box-shadow: 0 5px 15px rgba(13, 110, 253, 0.4);
    }
    
    .card-img-top {
      border-radius: 20px 20px 0 0;
      opacity: 0.9;
      transition: opacity 0.3s ease;
      height: 250px;
      object-fit: cover;
    }
    
    .card:hover .card-img-top {
      opacity: 1;
    }
    
    /* أيقونة الشعار */
    .logo-icon {
      color: #00bcd4;
      font-size: 2rem;
      filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.5));
    }
    
    /* تحسينات اللمس للهاتف المحمول */
    @media (hover: none) and (pointer: coarse) {
      .card:hover {
        transform: none;
        background: rgba(255, 255, 255, 0.15);
      }
      
      .btn-primary:hover {
        transform: none;
      }
      
      .card:active {
        transform: scale(0.98);
        background: rgba(255, 255, 255, 0.2);
      }
      
      .btn-primary:active {
        transform: scale(0.95);
      }
      
      .navbar-brand:hover {
        transform: none;
      }
      
      .navbar-nav .nav-link:hover {
        transform: none;
      }
    }