:root {
      --primary-color: #2c3e50;
      --secondary-color: #3498db;
      --accent-color: #e74c3c;
      --success-color: #27ae60;
      --warning-color: #f39c12;
      --light-bg: #f8f9fa;
      --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
      --gradient-primary: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
      --gradient-secondary: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    }
    
    body {
      background: linear-gradient(135deg, #f5f7fa 0%, #e4efe9 100%);
      font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
      color: #2d3748;
      line-height: 1.6;
      min-height: 100vh;
      overflow-x: hidden; /* Critical fix */
    }
    
    .navbar {
      background: var(--gradient-primary) !important;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      padding: 1rem 0;
    }
    
    .navbar-brand {
      font-size: 1.4rem;
      font-weight: 700;
    }
    
    .card {
      border: none;
      border-radius: 16px;
      box-shadow: var(--card-shadow);
      overflow: hidden;
      background: rgba(255, 255, 255, 0.95);
    }
    
    .card-title {
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      font-weight: 800;
      font-size: 2.2rem;
      margin-bottom: 1rem;
      text-align: center;
      padding-bottom: 0.5rem;
      position: relative;
    }
    
    .card-title::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background: var(--gradient-primary);
      border-radius: 2px;
    }
    
    .form-section {
      background: white;
      border-radius: 12px;
      padding: 2rem;
      margin-bottom: 2rem;
      border: 1px solid #e2e8f0;
    }
    
    .section-title {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--primary-color);
      margin-bottom: 1.5rem;
      padding-bottom: 0.75rem;
      border-bottom: 3px solid #edf2f7;
      display: flex;
      align-items: center;
    }
    
    .section-title i {
      margin-right: 0.75rem;
      color: var(--secondary-color);
    }
    
    .form-label {
      font-weight: 600;
      color: #4a5568;
      font-size: 0.95rem;
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
    }
    
    .form-control, .form-select {
      height: 50px;
      border-radius: 10px;
      border: 2px solid #e2e8f0;
      padding: 0.75rem 1rem;
      font-size: 1rem;
      background-color: #f8fafc;
      touch-action: manipulation; /* Better touch */
    }
    
    .form-control:focus, .form-select:focus {
      border-color: var(--secondary-color);
      box-shadow: 0 0 0 0.3rem rgba(52, 152, 219, 0.15);
      background-color: white;
    }
    
    .subject-row {
      margin-bottom: 1.5rem;
    }
    
    .subject-col {
      padding-right: 1rem;
      padding-left: 1rem;
    }
    
    .btn-submit {
      background: var(--gradient-secondary);
      border: none;
      padding: 1rem 3rem;
      font-size: 1.2rem;
      font-weight: 700;
      border-radius: 12px;
      letter-spacing: 0.5px;
      color: white;
      touch-action: manipulation;
    }
    
    .required-asterisk {
      color: var(--accent-color);
      margin-left: 4px;
      font-weight: 700;
    }
    
    .optional-badge {
      background: var(--warning-color);
      color: white;
      padding: 0.25rem 0.75rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      margin-left: 0.75rem;
    }
    
    .mandatory-badge {
      background: var(--success-color);
      color: white;
      padding: 0.25rem 0.75rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      margin-left: 0.75rem;
    }
    
    .grid-container {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 1.5rem;
    }
    
    .cluster-input-group {
      position: relative;
    }
    
    .cluster-input-group .form-control {
      padding-right: 3rem;
    }
    
    .cluster-number {
      position: absolute; /* FIXED */
      right: 1rem;
      top: 50%;
      transform: translateY(-50%);
      background: var(--secondary-color);
      color: white;
      width: 30px;
      height: 30px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.8rem;
      font-weight: 700;
    }
    
    .form-section-header {
      display: flex;
      justify-content: space-between; /* FIXED */
      align-items: center;
      margin-bottom: 1.5rem;
    }
    
    .section-description {
      color: #718096;
      font-size: 0.95rem;
      margin-bottom: 1.5rem;
      line-height: 1.6;
    }
    
    .subject-card {
      background: #f8fafc;
      border-radius: 10px;
      padding: 1rem;
      border: 2px solid transparent;
    }
    
    .progress-container {
      background: white;
      border-radius: 12px;
      padding: 1.5rem;
      margin-bottom: 2rem;
      box-shadow: var(--card-shadow);
    }
    
    .progress-info {
      display: flex;
      justify-content: space-between;
      margin-bottom: 0.5rem;
      font-weight: 600;
      color: var(--primary-color);
    }
    
    .progress {
      height: 8px;
      border-radius: 10px;
      background: #e2e8f0;
    }
    
    .progress-bar {
      background: var(--gradient-secondary);
      border-radius: 10px;
    }

    .subject-counter {
      background: white;
      border-radius: 12px;
      padding: 1rem 1.5rem;
      margin-bottom: 2rem;
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--warning-color);
    }
    
    .counter-info {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 0.5rem;
    }
    
    .counter-text {
      font-weight: 600;
      color: var(--primary-color);
    }
    
    .counter-value {
      font-weight: 700;
      font-size: 1.1rem;
      color: var(--warning-color);
    }
    
    .counter-message {
      font-size: 0.9rem;
      color: #718096;
      margin-bottom: 0;
    }
    
    .counter-success {
      color: var(--success-color);
    }
    
    .counter-warning {
      color: var(--warning-color);
    }
    
    .counter-error {
      color: var(--accent-color);
    }
    
    /* Mobile fixes */
    @media (max-width: 768px) {
      .card {
        border-radius: 12px;
        margin: 0.5rem;
      }
      
      .form-section {
        padding: 1.5rem;
      }
      
      .grid-container {
        grid-template-columns: 1fr;
      }
      
      .card-title {
        font-size: 1.8rem;
      }
      
      .btn-submit {
        width: 100%;
        padding: 1rem 2rem;
      }
      
      .subject-counter {
        padding: 1rem;
      }
      
      .counter-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
      }
      
      .form-section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
      }
      
      /* Disable all animations and transitions on mobile */
      * {
        transition: none !important;
        animation: none !important;
      }
      
      .form-section:hover,
      .subject-card:hover,
      .btn-submit:hover {
        transform: none !important;
        box-shadow: var(--card-shadow) !important;
      }
    }

    /* Desktop-only hover effects */
    @media (min-width: 769px) {
      .form-section:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
      }
      
      .subject-card:hover {
        border-color: var(--secondary-color);
        background: white;
      }
      
      .btn-submit:hover {
        transform: translateY(-3px);
        box-shadow: 0 12px 20px rgba(52, 152, 219, 0.3);
      }
    }

    /* Additional styles for header buttons */
    .header-buttons {
      display: flex;
      gap: 10px;
      margin-left: auto;
    }
    
    .btn-home, .btn-paid {
      display: flex;
      align-items: center;
      gap: 5px;
      padding: 8px 16px;
      border-radius: 6px;
      text-decoration: none;
      font-weight: 500;
      transition: all 0.3s ease;
    }
    
    .btn-home {
      background: rgba(255, 255, 255, 0.2);
      color: white;
      border: 1px solid rgba(255, 255, 255, 0.3);
    }
    
    .btn-home:hover {
      background: rgba(255, 255, 255, 0.3);
      color: white;
      text-decoration: none;
    }
    
    .btn-paid {
      background: #28a745;
      color: white;
      border: 1px solid #28a745;
    }
    
    .btn-paid:hover {
      background: #218838;
      color: white;
      text-decoration: none;
      transform: translateY(-1px);
    }
    
    /* Responsive adjustments */
    @media (max-width: 768px) {
      .header-buttons {
        gap: 8px;
      }
      
      .btn-home, .btn-paid {
        padding: 6px 12px;
        font-size: 14px;
      }
    }
    .image-placeholder {
  background-color: #f8f9fa;
  border: 2px dashed #dee2e6;
  border-radius: 8px;
  padding: 40px 20px;
  margin: 15px 0;
  text-align: center;
}

.cluster-input-group {
  position: relative;
}

.cluster-number {
  position: absolute;
  right: 10px;
  top: 35px;
  background: #0d6efd;
  color: white;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: bold;
}