/* ===== TOOL HEADER ===== */
    .tool-header {
      text-align: center;
      padding: 3rem 2rem 1rem;
      background: var(--accent);
      background-size: cover;
    }

    .tool-title {
      font-size: 2.5rem;
      color: var(--secondary);
      margin-bottom: 1rem;
    }

    .tool-subtitle {
      font-size: 1.1rem;
      color: var(--secondary-light);
      max-width: 700px;
      margin: 0 auto 2rem;
    }

    /* ===== TOOL CONTAINER ===== */
    .tool-container {
      max-width: 1000px;
      margin: 0 auto;
      padding: 2rem;
    }

    .tool-wrapper {
      background: var(--light);
      border-radius: 16px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
      overflow: hidden;
      margin-bottom: 3rem;
    }

    /* ===== UPLOAD AREA ===== */
    .upload-area {
      border: 3px dashed rgba(51, 51, 51, 0.2);
      border-radius: 12px;
      padding: 3rem 2rem;
      text-align: center;
      transition: all 0.3s;
      background: var(--accent);
      cursor: pointer;
      margin: 2rem;
      position: relative;
    }

    .upload-area.highlight {
      border-color: var(--primary);
      background-color: rgba(217, 79, 79, 0.05);
    }

    .upload-icon {
      font-size: 4rem;
      color: var(--primary);
      margin-bottom: 1.5rem;
    }

    .upload-text h3 {
      font-size: 1.5rem;
      color: var(--secondary);
      margin-bottom: 0.5rem;
    }

    .upload-text p {
      color: var(--secondary-light);
      margin-bottom: 1.5rem;
    }

    .upload-btn {
      display: inline-block;
      background: var(--primary);
      color: var(--light);
      padding: 0.8rem 1.8rem;
      border-radius: 50px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(217, 79, 79, 0.3);
      cursor: pointer;
      border: none;
      font-size: 1rem;
    }

    .upload-btn:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(217, 79, 79, 0.4);
    }

    .file-input {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      opacity: 0;
      cursor: pointer;
    }

    /* ===== FILE INFO ===== */
    .file-info-container {
      padding: 0 2rem 1rem;
      display: none;
    }

    .file-info-card {
      display: flex;
      align-items: center;
      padding: 1rem;
      border: 1px solid rgba(51, 51, 51, 0.1);
      border-radius: 8px;
      background: var(--accent);
      margin-bottom: 1rem;
    }

    .file-icon {
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(217, 79, 79, 0.1);
      border-radius: 6px;
      margin-right: 1rem;
      flex-shrink: 0;
    }

    .file-icon i {
      color: var(--primary);
      font-size: 1.2rem;
    }

    .file-info {
      flex-grow: 1;
      min-width: 0;
    }

    .file-name {
      font-weight: 500;
      color: var(--secondary);
      margin-bottom: 0.2rem;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .file-size {
      font-size: 0.85rem;
      color: var(--secondary-light);
    }

    .file-actions {
      display: flex;
      gap: 0.8rem;
    }

    .file-action-btn {
      background: transparent;
      border: none;
      color: var(--secondary-light);
      cursor: pointer;
      font-size: 1.1rem;
      transition: color 0.3s;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .file-action-btn:hover {
      background: rgba(0, 0, 0, 0.05);
      color: var(--primary);
    }

    /* ===== SPLIT OPTIONS ===== */
    .split-options {
      padding: 0 2rem 2rem;
      display: none;
    }

    .options-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.5rem;
      padding-bottom: 0.8rem;
      border-bottom: 1px solid rgba(51, 51, 51, 0.1);
    }

    .options-title {
      font-size: 1.3rem;
      color: var(--secondary);
    }

    .split-methods {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 1.5rem;
      margin-bottom: 2rem;
    }

    .method-card {
      background: var(--accent);
      border-radius: 12px;
      padding: 1.5rem;
      cursor: pointer;
      transition: all 0.3s;
      border: 2px solid transparent;
    }

    .method-card:hover {
      transform: translateY(-3px);
      box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    }

    .method-card.active {
      border-color: var(--primary);
      background: rgba(217, 79, 79, 0.05);
    }

    .method-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 1rem;
    }

    .method-title {
      font-size: 1.2rem;
      color: var(--secondary);
      margin-bottom: 0.5rem;
    }

    .method-description {
      font-size: 0.9rem;
      color: var(--secondary-light);
    }

    /* ===== RANGE SELECTOR ===== */
    .range-selector {
      background: var(--light);
      border-radius: 12px;
      padding: 1.5rem;
      border: 1px solid rgba(51, 51, 51, 0.1);
      margin-top: 1.5rem;
      display: none;
    }

    .range-title {
      font-size: 1.1rem;
      color: var(--secondary);
      margin-bottom: 1rem;
    }

    .range-inputs {
      display: flex;
      gap: 1rem;
      align-items: center;
      flex-wrap: wrap;
    }

    .range-input {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .range-input label {
      font-size: 0.9rem;
      color: var(--secondary);
    }

    .range-input input {
      width: 100%;
      padding: 0.7rem;
      border: 1px solid rgba(51, 51, 51, 0.2);
      border-radius: 6px;
      font-size: 1rem;
    }

    .page-preview {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
      gap: 0.8rem;
      margin-top: 1.5rem;
      max-height: 300px;
      overflow-y: auto;
      padding: 1rem;
      background: #f9f9f9;
      border-radius: 8px;
    }

    .page-item {
      position: relative;
      background: var(--light);
      border: 2px solid rgba(51, 51, 51, 0.1);
      border-radius: 8px;
      padding: 0.5rem;
      height: 100px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: all 0.2s;
    }

    .page-item:hover {
      border-color: var(--primary);
    }

    .page-item.selected {
      border-color: var(--primary);
      background: rgba(217, 79, 79, 0.05);
    }

    .page-number {
      position: absolute;
      top: 5px;
      left: 5px;
      background: rgba(44, 62, 80, 0.7);
      color: var(--light);
      border-radius: 50%;
      width: 24px;
      height: 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.7rem;
    }

    .page-content {
      font-size: 3rem;
      color: #ddd;
    }

    /* ===== SPLIT ACTION ===== */
    .split-actions {
      display: flex;
      justify-content: center;
      padding: 0 2rem 2rem;
    }

    .split-btn {
      background: var(--primary);
      color: var(--light);
      border: none;
      padding: 1rem 2.5rem;
      border-radius: 50px;
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      transition: all 0.3s;
      display: flex;
      align-items: center;
      gap: 0.8rem;
      box-shadow: 0 4px 15px rgba(217, 79, 79, 0.3);
    }

    .split-btn:hover {
      background: var(--primary-dark);
      transform: translateY(-3px);
      box-shadow: 0 6px 20px rgba(217, 79, 79, 0.4);
    }

    .split-btn:disabled {
      background: #ccc;
      cursor: not-allowed;
      transform: none;
      box-shadow: none;
    }

    /* ===== ERROR MESSAGES ===== */
    .error-message {
      background-color: #ffebee;
      color: var(--danger);
      padding: 1rem 1.5rem;
      border-radius: 8px;
      margin-top: 1.5rem;
      display: none;
      align-items: center;
      gap: 1rem;
      border: 1px solid rgba(217, 79, 79, 0.2);
    }

    .error-message i {
      font-size: 1.2rem;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(-10px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* ===== PROGRESS INDICATOR ===== */
    .progress-container {
      width: 100%;
      padding: 1.5rem 2rem;
    }

    .progress-bar {
      height: 10px;
      background-color: #e0e0e0;
      border-radius: 5px;
      overflow: hidden;
      margin-bottom: 0.5rem;
    }

    .progress-fill {
      height: 100%;
      background-color: var(--primary);
      width: 0%;
      transition: width 0.3s ease;
    }

    .progress-text {
      text-align: center;
      font-size: 0.9rem;
      color: var(--secondary);
      font-weight: 500;
    }

@media (max-width: 600px) {
  .upload-area {
    margin: 1rem auto;
    padding: 2rem 0.5rem;
    max-width: 95vw;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
  }
  .file-info-container {
    margin: 1rem auto;
    width: 100%;
    max-width: 95vw;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
  .file-info-card {
    width: 100%;
    max-width: 350px;
    margin: 0 auto 1rem auto;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    text-align: center;
  }
  .file-info {
    width: 100%;
    text-align: center;
  }
}
@media (max-width: 480px) {
  .upload-area, .file-info-container, .file-info-card {
    max-width: 99vw;
    padding: 1rem 0.2rem;
  }
}