.main-card {
      background: white;
      border-radius: 20px;
      box-shadow: 0 20px 60px rgba(0,0,0,0.3);
      overflow: hidden;
    }
    .card-header-custom {
      background: linear-gradient(135deg, #FDA12B 0%, #d58928 100%);
      color: white;
      padding: 30px;
      text-align: center;
    }
    .card-header-custom h1 {
      margin: 0;
      font-size: 2rem;
      font-weight: 600;
    }
    .card-header-custom p {
      margin: 10px 0 0 0;
      opacity: 0.9;
      font-size: 1.1rem;
    }
    .input-section {
      background: #f8f9fa;
      padding: 30px;
      border-radius: 15px;
      margin-bottom: 25px;
    }
    .input-section h5 {
      color: #FDA12B;
      font-weight: 600;
      margin-bottom: 20px;
      border-bottom: 2px solid #FDA12B;
      padding-bottom: 10px;
    }
    .form-label {
      font-weight: 600;
      color: #495057;
      margin-bottom: 8px;
    }
    .form-control:focus {
      border-color: #FDA12B;
      box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    }
    .input-group-text {
      background-color: #FDA12B;
      color: white;
      font-weight: 600;
      border: none;
    }
    .btn-calculate {
      background: linear-gradient(135deg, #FDA12B 0%, #d58928 100%);
      border: none;
      padding: 15px 40px;
      font-size: 1.2rem;
      font-weight: 600;
      border-radius: 10px;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-calculate:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
    }
    .results-section {
      background: #f8f9fa;
      padding: 30px;
      border-radius: 15px;
      margin-top: 25px;
      display: none;
    }
    .results-section.show {
      display: block;
      animation: fadeIn 0.5s;
    }
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .result-card {
      background: white;
      border-left: 4px solid #FDA12B;
      padding: 20px;
      margin-bottom: 15px;
      border-radius: 10px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.05);
      transition: transform 0.2s;
    }
    .result-card:hover {
      transform: translateX(5px);
    }
    .result-label {
      font-weight: 600;
      color: #FDA12B;
      font-size: 0.95rem;
      margin-bottom: 5px;
    }
    .result-value {
      font-size: 1.8rem;
      font-weight: 700;
      color: #2c3e50;
    }
    .result-unit {
      font-size: 1.1rem;
      color: #6c757d;
      margin-left: 5px;
    }
    .result-description {
      font-size: 0.85rem;
      color: #6c757d;
      margin-top: 5px;
      font-style: italic;
    }
    .highlight-result {
      background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
      border-left-color: #fdcb6e;
    }
    .info-icon {
      color: #FDA12B;
      cursor: help;
      margin-left: 5px;
    }
    .section-number {
      background: #FDA12B;
      color: white;
      width: 35px;
      height: 35px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-right: 10px;
    }