/* Base Styles */
  body {
    font-family: 'Poppins', sans-serif;
    background-color: #f0f9ff;
    margin: 0;
    padding: 0;
  }

  /* Page Display */
  .page {
    display: none;
  }
  .active-page {
    display: block;
  }

  /* Navigation */
  .nav-link {
    position: relative;
    font-weight: 500;
    color: #374151;
    text-decoration: none;
    transition: color 0.3s ease;
  }
  .nav-link:hover {
    color: #3b82f6;
  }
  .nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -2px;
    left: 0;
    background-color: #3b82f6;
    transition: width 0.3s ease;
  }
  .nav-link:hover::after {
    width: 100%;
  }

  /* Card */
  .card {
    background-color: #ffffff;
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
                0 2px 4px -1px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
  }
  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.4);
  }

  /* Buttons */
  .btn-primary {
    background-color: #3b82f6;
    color: #ffffff;
    padding: 0.5rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
  }
  .btn-primary:hover {
    background-color: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.5);
  }

  /* Form */
  .form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid #d1d5db;
    transition: all 0.3s ease;
  }
  .form-input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
  }

  /* Containers */
  .container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
  }
  @media (min-width: 640px) {
    .container { max-width: 640px; }
  }
  @media (min-width: 768px) {
    .container { max-width: 768px; }
  }
  @media (min-width: 1024px) {
    .container { max-width: 1024px; }
  }
  @media (min-width: 1280px) {
    .container { max-width: 1280px; }
  }

  /* Flexbox Utilities */
  .flex { display: flex; }
  .flex-col { flex-direction: column; }
  .items-center { align-items: center; }
  .justify-between { justify-content: space-between; }
  .justify-center { justify-content: center; }
  @media (min-width: 768px) {
    .md\:flex-row { flex-direction: row; }
  }

  /* Spacing Utilities */
  .p-6 { padding: 1.5rem; }
  .p-8 { padding: 2rem; }
  .px-4 { padding-left: 1rem; padding-right: 1rem; }
  .py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
  .py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
  .py-12 { padding-top: 3rem; padding-bottom: 3rem; }
  .pt-4 { padding-top: 1rem; }
  .mb-2 { margin-bottom: 0.5rem; }
  .mb-4 { margin-bottom: 1rem; }
  .mb-6 { margin-bottom: 1.5rem; }
  .mb-8 { margin-bottom: 2rem; }
  .mb-12 { margin-bottom: 3rem; }
  .mr-4 { margin-right: 1rem; }
  .mt-1 { margin-top: 0.25rem; }
  .mt-2 { margin-top: 0.5rem; }
  .mt-4 { margin-top: 1rem; }
  .space-x-6 > * + * { margin-left: 1.5rem; }
  .space-y-6 > * + * { margin-top: 1.5rem; }
  .gap-4 { gap: 1rem; }
  .gap-6 { gap: 1.5rem; }
  .gap-8 { gap: 2rem; }

  /* Typography */
  .text-center { text-align: center; }
  .text-sm { font-size: 0.875rem; line-height: 1.25rem; }
  .text-xl { font-size: 1.25rem; line-height: 1.75rem; }
  .text-2xl { font-size: 1.5rem; line-height: 2rem; }
  .text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
  .text-4xl { font-size: 2.25rem; line-height: 2.5rem; }
  .text-5xl { font-size: 3rem; line-height: 1; }
  .text-6xl { font-size: 3.75rem; line-height: 1; }
  .font-medium { font-weight: 500; }
  .font-semibold { font-weight: 600; }
  .font-bold { font-weight: 700; }

  /* Colors */
  .bg-white { background-color: #ffffff; }
  .bg-blue-100 { background-color: #dbeafe; }
  .bg-blue-500 { background-color: #3b82f6; }
  .bg-pink-100 { background-color: #fce7f3; }
  .bg-purple-100 { background-color: #ede9fe; }
  .bg-gray-100 { background-color: #f3f4f6; }
  .text-blue-500 { color: #3b82f6; }
  .text-blue-600 { color: #2563eb; }
  .text-blue-700 { color: #1d4ed8; }
  .text-gray-400 { color: #9ca3af; }
  .text-gray-500 { color: #6b7280; }
  .text-gray-600 { color: #4b5563; }
  .text-gray-700 { color: #374151; }
  .text-gray-800 { color: #1f2937; }
  .text-green-500 { color: #10b981; }
  .text-red-500 { color: #ef4444; }
  .text-white { color: #ffffff; }

  /* Borders */
  .border { border-width: 1px; }
  .border-t { border-top-width: 1px; }
  .border-gray-300 { border-color: #d1d5db; }
  .rounded-lg { border-radius: 0.5rem; }
  .rounded-xl { border-radius: 0.75rem; }
  .rounded-full { border-radius: 9999px; }

  /* Shadows */
  .shadow-md {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
                0 2px 4px -1px rgba(0, 0, 0, 0.06);
  }
  .shadow-lg {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
                0 4px 6px -2px rgba(0, 0, 0, 0.05);
  }

  /* Grid */
  .grid { display: grid; }
  .grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  @media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  }
  @media (min-width: 1024px) {
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  }

  /* Widths */
  .w-full { width: 100%; }
  .max-w-md { max-width: 28rem; }
  .max-w-xl { max-width: 36rem; }
  .max-w-2xl { max-width: 42rem; }
  .max-w-4xl { max-width: 56rem; }

  /* Misc */
  .hidden { display: none; }
  .relative { position: relative; }
  .absolute { position: absolute; }
  .right-3 { right: 0.75rem; }
  .top-3 { top: 0.75rem; }
  .h-6 { height: 1.5rem; }
  .w-6 { width: 1.5rem; }
  .h-auto { height: auto; }
  .overflow-hidden { overflow: hidden; }
  .focus\:outline-none:focus { outline: none; }
  .hover\:bg-blue-600:hover { background-color: #2563eb; }
  .hover\:bg-blue-200:hover { background-color: #bfdbfe; }
  .hover\:text-blue-600:hover { color: #2563eb; }