body {
      box-sizing: border-box;
    }
    
    * {
      font-family: 'Inter', sans-serif;
    }
    
    h1, h2, h3, h4, h5, h6 {
      font-family: 'Poppins', sans-serif;
    }
    
    .mono {
      font-family: 'Roboto Mono', monospace;
    }
    
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    
    @keyframes float {
      0%, 100% {
        transform: translateY(0px);
      }
      50% {
        transform: translateY(-20px);
      }
    }
    
    @keyframes pulse-glow {
      0%, 100% {
        box-shadow: 0 0 20px rgba(37, 99, 235, 0.3);
      }
      50% {
        box-shadow: 0 0 40px rgba(37, 99, 235, 0.6);
      }
    }
    
    .animate-fade-in-up {
      animation: fadeInUp 0.8s ease-out forwards;
    }
    
    .animate-float {
      animation: float 3s ease-in-out infinite;
    }
    
    .gradient-bg {
      background: linear-gradient(135deg, #F9FAFB 0%, #E5E7EB 100%);
    }
    
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .card-hover:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    }
    
    .btn-ripple {
      position: relative;
      overflow: hidden;
    }
    
    .btn-ripple::after {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      width: 0;
      height: 0;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.5);
      transform: translate(-50%, -50%);
      transition: width 0.6s, height 0.6s;
    }
    
    .btn-ripple:active::after {
      width: 300px;
      height: 300px;
    }
    
    .sticky-header {
      transition: all 0.3s ease;
    }
    
    .sticky-header.scrolled {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    }
    
    .timeline-line {
      position: absolute;
      left: 50%;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(to bottom, #2563EB, #22C55E);
      transform: translateX(-50%);
    }
    
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    
    .accordion-content.active {
      max-height: 500px;
    }
    
    .wave-bg {
      background: linear-gradient(135deg, #EFF6FF 0%, #F0FDF4 100%);
      position: relative;
      overflow: hidden;
    }
    
    .wave-bg::before {
      content: '';
      position: absolute;
      width: 200%;
      height: 200%;
      top: -50%;
      left: -50%;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
      animation: wave-rotate 20s linear infinite;
    }
    
    @keyframes wave-rotate {
      from {
        transform: rotate(0deg);
      }
      to {
        transform: rotate(360deg);
      }
    }
    
    .calculator-input {
      transition: all 0.3s ease;
    }
    
    .calculator-input:focus {
      transform: scale(1.02);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }
    
    .page-content {
      display: none;
    }
    
    .page-content.active {
      display: block;
    }
    
    .modal-overlay {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(0, 0, 0, 0.5);
      z-index: 1000;
      animation: fadeIn 0.3s ease;
    }
    
    .modal-overlay.active {
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    @keyframes fadeIn {
      from {
        opacity: 0;
      }
      to {
        opacity: 1;
      }
    }
    
    .modal-content {
      background: white;
      border-radius: 16px;
      padding: 32px;
      max-width: 400px;
      width: 90%;
      animation: slideUp 0.3s ease;
    }
    
    @keyframes slideUp {
      from {
        transform: translateY(50px);
        opacity: 0;
      }
      to {
        transform: translateY(0);
        opacity: 1;
      }
    }