:root {
      --primary-color: #667eea;
      --secondary-color: #764ba2;
      --accent-color: #f093fb;
      --dark-color: #2d3748;
      --light-color: #f7fafc;
      --success-color: #48bb78;
      --warning-color: #ed8936;
      --danger-color: #f56565;
    }

    * {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    }

    body {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      min-height: 100vh;
      position: relative;
    }

    body::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.05"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
      pointer-events: none;
      z-index: -1;
    }

    .navbar {
      background: rgba(255, 255, 255, 0.95) !important;
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.2);
      box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 1.5rem;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-link {
      font-weight: 500;
      transition: all 0.3s ease;
      position: relative;
    }

    .nav-link:hover {
      color: var(--primary-color) !important;
      transform: translateY(-2px);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      border: none;
      border-radius: 50px;
      padding: 8px 24px;
      font-weight: 500;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
    }

    .btn-success {
      background: linear-gradient(135deg, #48bb78, #38a169);
      border: none;
      border-radius: 50px;
      padding: 10px 30px;
      font-weight: 500;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(72, 187, 120, 0.4);
    }

    .btn-success:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(72, 187, 120, 0.6);
    }

    .hero-section {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      padding: 60px 40px;
      margin: 40px 0;
      text-align: center;
      border: 1px solid rgba(255, 255, 255, 0.2);
      box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    }

    .hero-section h1 {
      color: white;
      font-size: 3.5rem;
      font-weight: 700;
      margin-bottom: 20px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    }

    .hero-section p {
      color: rgba(255, 255, 255, 0.9);
      font-size: 1.2rem;
      margin-bottom: 30px;
    }

    .card {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 20px;
      transition: all 0.3s ease;
      box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
      overflow: hidden;
    }

    .card:hover {
      transform: translateY(-10px);
      box-shadow: 0 20px 40px rgba(31, 38, 135, 0.5);
    }

    .card-title {
      color: var(--dark-color);
      font-weight: 600;
      font-size: 1.25rem;
    }

    .card-subtitle {
      color: var(--secondary-color);
      font-weight: 500;
    }

    .card-text {
      color: #666;
      line-height: 1.6;
    }

    .badge {
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      border-radius: 20px;
      padding: 5px 12px;
      font-weight: 500;
      margin: 2px;
    }

    pre {
      background: rgba(45, 55, 72, 0.95) !important;
      color: #e2e8f0;
      border-radius: 15px;
      padding: 20px;
      border: 1px solid rgba(255, 255, 255, 0.1);
      font-family: 'Fira Code', 'Consolas', monospace;
    }

    .like-btn {
      cursor: pointer;
      transition: all 0.3s ease;
      padding: 8px 12px;
      border-radius: 50px;
      background: rgba(255, 255, 255, 0.1);
    }

    .like-btn:hover {
      background: rgba(255, 255, 255, 0.2);
      transform: scale(1.1);
    }

    .form-control {
      border-radius: 15px;
      border: 2px solid rgba(255, 255, 255, 0.3);
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(10px);
      transition: all 0.3s ease;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
      background: rgba(255, 255, 255, 0.95);
    }

    .alert {
      border-radius: 15px;
      border: none;
      backdrop-filter: blur(10px);
    }

    .alert-success {
      background: rgba(72, 187, 120, 0.9);
      color: white;
    }

    .alert-warning {
      background: rgba(237, 137, 54, 0.9);
      color: white;
    }

    .container-fluid {
      max-width: 1400px;
    }

    .add-card-section {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      padding: 40px;
      margin: 40px 0;
      border: 1px solid rgba(255, 255, 255, 0.2);
      box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    }

    .add-card-section h2 {
      color: white;
      font-weight: 600;
      text-align: center;
      margin-bottom: 30px;
    }

    .form-label {
      color: white;
      font-weight: 500;
      margin-bottom: 8px;
    }

    footer {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(10px);
      border-radius: 20px 20px 0 0;
      padding: 40px;
      margin-top: 60px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-bottom: none;
    }

    footer h2 {
      color: white;
      font-weight: 600;
      text-align: center;
      margin-bottom: 30px;
    }

    .tag-filters {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(10px);
      border-radius: 15px;
      padding: 20px;
      margin: 20px 0;
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .tag-filters .nav-link {
      color: white;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 25px;
      margin: 0 5px;
      padding: 8px 20px;
      transition: all 0.3s ease;
    }

    .tag-filters .nav-link:hover {
      background: rgba(255, 255, 255, 0.2);
      color: white;
      transform: translateY(-2px);
    }

    @media (max-width: 768px) {
      .hero-section h1 {
        font-size: 2.5rem;
      }
      
      .hero-section {
        padding: 40px 20px;
      }
      
      .add-card-section {
        padding: 20px;
        margin: 20px 0;
      }
    }