body {
      box-sizing: border-box;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary-bg: #0f0f23;
      --card-bg: #1a1a2e;
      --electric-blue: #00d4ff;
      --teal: #00ffb3;
      --purple: #b47aff;
      --charcoal: #2d2d44;
    }

    body {
      font-family: 'Poppins', sans-serif;
      background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
      color: #ffffff;
      overflow-x: hidden;
    }

    .space-grotesk {
      font-family: 'Space Grotesk', sans-serif;
    }

    /* Glassmorphism */
    .glass {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }

    /* Gradient text */
    .gradient-text {
      background: linear-gradient(135deg, var(--electric-blue), var(--teal), var(--purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* Neon glow */
    .neon-glow {
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
      transition: all 0.3s ease;
    }

    .neon-glow:hover {
      box-shadow: 0 0 30px rgba(0, 212, 255, 0.6), 0 0 60px rgba(0, 255, 179, 0.3);
      transform: translateY(-5px);
    }

    /* Animated gradient background */
    @keyframes gradientShift {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

    .animated-gradient {
      background: linear-gradient(135deg, #00d4ff, #00ffb3, #b47aff, #00d4ff);
      background-size: 300% 300%;
      animation: gradientShift 8s ease infinite;
    }

    /* Floating particles */
    .particle {
      position: absolute;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0, 212, 255, 0.3), transparent);
      pointer-events: none;
      animation: float 6s ease-in-out infinite;
    }

    @keyframes float {
      0%, 100% { transform: translateY(0) translateX(0); opacity: 0.3; }
      50% { transform: translateY(-30px) translateX(20px); opacity: 0.6; }
    }

    /* Card hover effects */
    .skill-card {
      transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
      position: relative;
      overflow: hidden;
    }

    .skill-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.2), transparent);
      transition: left 0.5s ease;
    }

    .skill-card:hover::before {
      left: 100%;
    }

    .skill-card:hover {
      transform: translateY(-10px) rotate(1deg);
      border-color: var(--electric-blue);
    }

    /* Button animations */
    .btn-primary {
      position: relative;
      overflow: hidden;
      transition: all 0.3s ease;
    }

    .btn-primary::after {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      width: 0;
      height: 0;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.3);
      transform: translate(-50%, -50%);
      transition: width 0.6s, height 0.6s;
    }

    .btn-primary:hover::after {
      width: 300px;
      height: 300px;
    }

    /* Scroll animations */
    .fade-in {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .fade-in.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* Modal styles */
    .modal {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.8);
      z-index: 9999;
      animation: fadeIn 0.3s ease;
    }

    .modal.active {
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .modal-content {
      background: linear-gradient(135deg, #1a1a2e, #16213e);
      border-radius: 20px;
      padding: 40px;
      max-width: 600px;
      width: 90%;
      max-height: 80%;
      overflow-y: auto;
      position: relative;
      border: 2px solid var(--electric-blue);
      box-shadow: 0 0 50px rgba(0, 212, 255, 0.3);
    }

    @keyframes fadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    /* Custom scrollbar */
    ::-webkit-scrollbar {
      width: 10px;
    }

    ::-webkit-scrollbar-track {
      background: #1a1a2e;
    }

    ::-webkit-scrollbar-thumb {
      background: linear-gradient(135deg, var(--electric-blue), var(--teal));
      border-radius: 5px;
    }

    /* Timeline */
    .timeline-dot {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--electric-blue), var(--teal));
      position: relative;
      animation: pulse 2s ease-in-out infinite;
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); opacity: 1; }
      50% { transform: scale(1.2); opacity: 0.8; }
    }

    /* Newsletter input */
    .newsletter-input {
      background: rgba(255, 255, 255, 0.1);
      border: 2px solid rgba(255, 255, 255, 0.2);
      transition: all 0.3s ease;
    }

    .newsletter-input:focus {
      outline: none;
      border-color: var(--electric-blue);
      background: rgba(255, 255, 255, 0.15);
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    }

    /* Login/Signup styles */
    .auth-container {
      min-height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 40px 20px;
    }

    .auth-box {
      background: rgba(26, 26, 46, 0.8);
      backdrop-filter: blur(20px);
      border-radius: 30px;
      padding: 50px;
      max-width: 450px;
      width: 100%;
      border: 2px solid rgba(0, 212, 255, 0.3);
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    }

    .auth-input {
      width: 100%;
      padding: 15px 20px;
      background: rgba(255, 255, 255, 0.05);
      border: 2px solid rgba(255, 255, 255, 0.1);
      border-radius: 12px;
      color: white;
      font-size: 16px;
      transition: all 0.3s ease;
    }

    .auth-input:focus {
      outline: none;
      border-color: var(--electric-blue);
      background: rgba(255, 255, 255, 0.08);
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
    }

    .auth-input::placeholder {
      color: rgba(255, 255, 255, 0.4);
    }

    /* Course filters */
    .filter-btn {
      padding: 10px 24px;
      background: rgba(255, 255, 255, 0.05);
      border: 2px solid rgba(255, 255, 255, 0.1);
      border-radius: 25px;
      color: white;
      cursor: pointer;
      transition: all 0.3s ease;
      font-weight: 500;
    }

    .filter-btn:hover, .filter-btn.active {
      background: linear-gradient(135deg, var(--electric-blue), var(--teal));
      border-color: var(--electric-blue);
      transform: translateY(-2px);
      box-shadow: 0 5px 15px rgba(0, 212, 255, 0.3);
    }

    /* Difficulty badges */
    .badge-beginner {
      background: linear-gradient(135deg, #00ff88, #00d4ff);
    }

    .badge-intermediate {
      background: linear-gradient(135deg, #ffd700, #ff8c00);
    }

    .badge-advanced {
      background: linear-gradient(135deg, #ff1744, #b47aff);
    }

    /* Hide scrollbar but keep functionality */
    .hide-scrollbar {
      scrollbar-width: none;
      -ms-overflow-style: none;
    }

    .hide-scrollbar::-webkit-scrollbar {
      display: none;
    }

    /* Quick view modal */
    .quick-view-content {
      max-width: 900px;
      width: 95%;
    }