html, body { height: 100%; margin: 0; }
  * { transition: background-color 0.3s, color 0.3s, border-color 0.3s; }
  
  body.light-mode { background: #f9fafb; color: #1f2937; }
  body.dark-mode { background: #0f172a; color: #e2e8f0; }
  
  .gradient-mesh {
    background: radial-gradient(ellipse at 20% 50%, rgba(59,130,246,0.12) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(59,130,246,0.10) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 80%, rgba(168,85,247,0.08) 0%, transparent 250%);
  }
  
  body.light-mode .card { background: #ffffff; border-color: rgba(0,0,0,0.1); }
  body.dark-mode .card { background: #1e293b; border-color: rgba(255,255,255,0.1); }
  body.light-mode .text-gray-400 { color: #000;}
  
    body.light-mode .dash-nav { background: #fff !important; color:gray; border-right:0.1px solid gray}
    body.dark-mode .dash-nav { background: #0f172a; color: #e2e8f0; }
   body.light-mode #otp-inputs .border-b { border-bottom:0.1px solid gray;} 
   
   .outline-otp {
    outline: 2px solid #0000003d !important;
    outline-offset: 2px;
    color: #000;
}
    body.light-mode .otp-field { border:1px solid gray!important;} 
    
  body.light-mode .text-gray-400, .text-gray-500 { color: #000;}
  
  
    /* Light Mode: Gradient Blue Text */
    body.light-mode .nero {
        /*background: linear-gradient(90deg, #3b82f6, #1d4ed8);*/
        /*-webkit-background-clip: text;*/
        /*-webkit-text-fill-color: transparent;*/
        /*display: inline-block*/
        color: #000;
        /*filter: drop-shadow(0 2px 4px rgba(59, 130, 246, 0.2));*/
        
    }
    
    /* Dark Mode: Glowing White Text */
    body.dark-mode .nero {
        color: #ffffff;
        text-shadow: 0 0 10px rgba(255, 255, 255, 0.5), 
                     0 0 20px rgba(59, 130, 246, 0.3);
    }
    
    /* Glowing Border for the Hero Section (if applicable) */
    .hero-glow-border {
        border: 1px solid rgba(59, 130, 246, 0.3);
        box-shadow: 0 0 20px rgba(59, 130, 246, 0.15);
        transition: all 0.3s ease;
    }
      
  .glow-card:hover { box-shadow: 0 0 40px rgba(59,130,246,0.2), 0 8px 32px rgba(59,130,246,0.1); }
  .nav-blur { backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); }
  
  @keyframes fadeUp { from { opacity:0; transform:translateY(24px); } to { opacity:1; transform:translateY(0); } }
  @keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
  @keyframes slideDown { from { opacity:0; transform:translateY(-10px); } to { opacity:1; transform:translateY(0); } }
  @keyframes pulse-glow { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
  
  .anim-up { animation: fadeUp 0.7s ease both; }
  .anim-up-d1 { animation: fadeUp 0.7s ease 0.1s both; }
  .anim-up-d2 { animation: fadeUp 0.7s ease 0.2s both; }
  .anim-up-d3 { animation: fadeUp 0.7s ease 0.3s both; }
  .anim-up-d4 { animation: fadeUp 0.7s ease 0.4s both; }
  .anim-fade { animation: fadeIn 0.5s ease both; }
  .anim-slide { animation: slideDown 0.3s ease both; }
  .pulse-glow { animation: pulse-glow 2s ease-in-out infinite; }
  
  .view { display: none; }
  .view.active { display: block; }
  
  .sidebar-link { transition: all 0.15s ease; }
  .sidebar-link:hover, .sidebar-link.active { background: rgba(59,130,246,0.15); color: #3b82f6; }
  
  body.light-mode .sidebar-link:hover, 
  body.light-mode .sidebar-link.active { background: rgba(59,130,246,0.1); color: #2563eb; }
  
  .modal-overlay { background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
  
  .code-block { 
    background: #0d1117; 
    border: 1px solid #1e293b; 
    border-radius: 8px; 
    padding: 16px; 
    font-family: 'Fira Code', monospace; 
    font-size: 13px; 
    color: #e2e8f0; 
    overflow-x: auto; 
  }
  
  body.light-mode .code-block {
    background: #f3f4f6;
    border: 1px solid #cbcbcb;
    color: #1f2937;
    width: 90%;
    margin: auto;
  }
  
  .code-comment { color: #6b7280; }
  .code-string { color: #10b981; }
  .code-keyword { color: #818cf8; }
  .code-method { color: #f59e0b; }
  
  .tab-btn { transition: all 0.15s; }
  .tab-btn.active { color: #3b82f6; border-color: #3b82f6; }
  
  @keyframes slideIn { from { transform: translateX(100%); opacity:0; } to { transform: translateX(0); opacity:1; } }
  @keyframes slideOut { from { transform: translateX(0); opacity:1; } to { transform: translateX(100%); opacity:0; } }
  .toast-in { animation: slideIn 0.3s ease both; }
  .toast-out { animation: slideOut 0.3s ease both; }
  
  .input-field { 
    background: #0f172a; 
    border: 1px solid #1e293b; 
    border-radius: 8px; 
    padding: 10px 14px; 
    color: #e2e8f0; 
    font-size: 14px; 
    width: 100%; 
    transition: border-color 0.2s; 
  }
  
  body.light-mode .input-field {
    background: #f3f4f6;
    border: 1px solid #d1d5db;
    color: #1f2937;
  }
  
  .input-field:focus { outline: none; border-color: #3b82f6; }
  
  .btn-primary { 
    background: #3b82f6; 
    color: #fff; 
    font-weight: 600; 
    padding: 10px 24px; 
    border-radius: 8px; 
    transition: all 0.2s; 
    border: none; 
    cursor: pointer; 
  }
  .btn-primary:hover { background: #2563eb; }
  
  .btn-secondary { 
    background: transparent; 
    color: #e2e8f0; 
    font-weight: 500; 
    padding: 10px 24px; 
    border-radius: 8px; 
    border: 1px solid #334155; 
    transition: all 0.2s; 
    cursor: pointer; 
  }
  
  body.light-mode .btn-secondary {
    color: #1f2937;
    border-color:  #1f2937;
  }
  
  .btn-secondary:hover { border-color: #3b82f6; color: #3b82f6; }
  
  .ai-model-card {
    position: relative;
    overflow: hidden;
  }
  
  .ai-model-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(59,130,246,0.1) 0%, transparent 70%);
    pointer-events: none;
  }
  
  .demo-animation {
    position: relative;
    height: 300px;
    border-radius: 12px;
    overflow: hidden;
  }
  
  body.light-mode .demo-animation {
    background: linear-gradient(135deg, #dbeafe 0%, #f0f9ff 100%);
  }
  
  body.dark-mode .demo-animation {
    background: linear-gradient(135deg, #1e40af 0%, #0f172a 100%);
  }
  
  .demo-box {
    position: absolute;
    border-radius: 8px;
  }
  
  @keyframes demo-transform-1 { 0% { opacity: 0; transform: scale(0.5) rotate(0deg); } 50% { opacity: 1; } 100% { opacity: 0; transform: scale(2) rotate(360deg); } }
  @keyframes demo-transform-2 { 0% { opacity: 0; transform: translateX(-50px) rotate(0deg); } 50% { opacity: 1; } 100% { opacity: 0; transform: translateX(50px) rotate(-360deg); } }
  
  .demo-1 { animation: demo-transform-1 3s ease-in-out infinite; }
  .demo-2 { animation: demo-transform-2 3s ease-in-out 1s infinite; }
  
  @media (max-width: 640px) {
    .sidebar-mobile { position: fixed; left: 0; top: 0; width: 100%; height: 100%; z-index: 40; }
    .sidebar-mobile.hidden { display: none; }
  }