/* Premium options section */
      .options-section {
        background: rgba(255, 255, 255, 0.3);
        backdrop-filter: blur(10px);
        border-radius: var(--radius-lg);
        padding: 1.75rem;
        margin-bottom: 2rem;
        border: 1px solid rgba(255, 255, 255, 0.3);
        box-shadow: var(--shadow-sm);
      }

      .options-section h3 {
        font-size: clamp(1.2rem, 4vw, 1.5rem);
        margin-bottom: 1.75rem;
        color: var(--premium-dark);
        font-weight: 600;
        display: flex;
        align-items: center;
        gap: 0.5rem;
      }

      .options-section h3::before {
        content: '';
        display: inline-block;
        width: 24px;
        height: 24px;
        background: var(--gradient-primary);
        border-radius: var(--radius-sm);
        }

      .option-row {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 1.5rem;
      }

      @media (min-width: 768px) {
        .option-row {
          flex-direction: row;
          align-items: center;
        }
      }

      .option-row label {
        width: 100%;
        font-weight: 500;
        color: var(--premium-dark);
        margin-bottom: 0.5rem;
        font-size: clamp(0.95rem, 3vw, 1.05rem);
      }

      @media (min-width: 768px) {
        .option-row label {
          width: 180px;
          margin-bottom: 0;
        }
      }

      .option-row select,
      .option-row input {
        flex: 1;
        width: 100%;
        padding: 0.9rem 1.2rem;
        border: 2px solid rgba(108, 92, 231, 0.2);
        border-radius: var(--radius-md);
        background: rgba(255, 255, 255, 0.8);
        transition: var(--transition-normal);
        font-size: 1rem;
        min-height: 48px;
        box-shadow: var(--shadow-sm);
      }

      /* Premium select dropdown */
      select {
        -webkit-appearance: none;
        -moz-appearance: none;
        appearance: none;
        background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236c5ce7' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
        background-repeat: no-repeat;
        background-position: right 1rem center;
        background-size: 1em;
        padding-right: 2.5rem !important;
      }

      .option-row select:focus,
      .option-row input:focus {
        outline: none;
        border-color: var(--premium-primary);
        box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
      }

      /* Premium checkbox group */
      .checkbox-group {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        width: 100%;
      }

      @media (min-width: 768px) {
        .checkbox-group {
          flex-direction: row;
          gap: 1.5rem;
        }
      }

      .checkbox-option {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        cursor: pointer;
      }

      .checkbox-option input[type="checkbox"] {
        -webkit-appearance: none;
        -moz-appearance: none;
        appearance: none;
        width: 20px;
        height: 20px;
        border: 2px solid var(--premium-secondary);
        border-radius: var(--radius-sm);
        outline: none;
        cursor: pointer;
        position: relative;
        transition: var(--transition-fast);
        flex-shrink: 0;
      }

      .checkbox-option input[type="checkbox"]:checked {
        background: var(--premium-primary);
        border-color: var(--premium-primary);
      }

      .checkbox-option input[type="checkbox"]:checked::after {
        content: '✓';
        position: absolute;
        color: rgb(220, 213, 213);
        font-size: 12px;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
      }

      .checkbox-option label {
        cursor: pointer;
        user-select: none;
        transition: var(--transition-fast);
        font-weight: 400;
        margin: 0;
      }

      .checkbox-option:hover label {
        color: var(--premium-primary);
      }

      /* Action buttons */
      .action-buttons {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        margin-bottom: 2rem;
      }

      @media (min-width: 768px) {
        .action-buttons {
          flex-direction: row;
          gap: 1.5rem;
        }
      }

      .convert-btn, .clear-btn {
        width: 100%;
        min-height: 56px;
        font-size: 1.1rem;
        padding: 1rem 2rem;
        border-radius: var(--radius-full);
        font-weight: 600;
        cursor: pointer;
        transition: var(--transition-normal);
        position: relative;
        overflow: hidden;
        z-index: 1;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        box-shadow: var(--shadow-md);
        border: none;
      }

      @media (min-width: 768px) {
        .convert-btn, .clear-btn {
          width: auto;
          flex: 1;
        }
      }

      .convert-btn {
        background: var(--gradient-primary);
        color: white;
      }

      .convert-btn::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(rgba(255,255,255,0.1), rgba(255,255,255,0.1));
        z-index: -1;
        transition: var(--transition-normal);
        opacity: 0;
      }

      .convert-btn:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-lg);
      }

      .convert-btn:hover::before {
        opacity: 1;
      }

      .convert-btn:active {
        transform: translateY(-1px);
      }

      .clear-btn {
        background: rgba(255, 255, 255, 0.2);
        color: var(--premium-danger);
        border: 2px solid var(--premium-danger);
        backdrop-filter: blur(5px);
        -webkit-backdrop-filter: blur(5px);
      }

      .clear-btn:hover {
        background: var(--premium-danger);
        color: white;
        transform: translateY(-3px);
        box-shadow: var(--shadow-lg);
      }

      /* Status section */
      .status-section {
        margin-bottom: 2rem;
      }

      .progress-bar {
        height: 10px;
        background: rgba(255,255,255,0.2);
        border-radius: var(--radius-full);
        overflow: hidden;
        margin-bottom: 1rem;
        box-shadow: var(--shadow-inner);
      }

      .progress-fill {
        height: 100%;
        background: var(--gradient-primary);
        border-radius: var(--radius-full);
        transition: width 0.5s ease;
        position: relative;
        overflow: hidden;
      }

      .progress-fill::after {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(
          90deg,
          #ffffff00 0%,
          #ce010165 50%,
          #e9c5c594 100%
        );
        animation: shimmer 2s infinite;
      }

      @keyframes shimmer {
        0% { transform: translateX(-100%); }
        100% { transform: translateX(100%); }
      }

      .status-message {
        text-align: center;
        color: rgba(45, 52, 54, 0.8);
        font-size: clamp(0.9rem, 3vw, 1rem);
        font-weight: 500;
      }