:root {
      --primary: #4361ee;
      --secondary: #3a0ca3;
      --success: #4cc9f0;
      --danger: #f72585;
      --light: #f8f9fa;
      --dark: #212529;
      --gray: #6c757d;
      --light-gray: #e9ecef;
      --border-radius: 12px;
      --box-shadow: 0 10px 25px rgba(0,0,0,0.1);
      --transition: all 0.3s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }
    
    body {
      background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 20px;
      color: var(--dark);
    }
    
    .container {
      width: 100%;
      max-width: 800px;
      background: white;
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
      overflow: hidden;
    }
    
    .header {
      background: linear-gradient(to right, var(--primary), var(--secondary));
      color: white;
      padding: 25px;
      text-align: center;
    }
    
    .header h1 {
      font-size: 28px;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
    }
    
    .header p {
      opacity: 0.9;
    }
    
    .content {
      padding: 30px;
    }
    
    .upload-box {
      background: var(--light);
      border-radius: var(--border-radius);
      padding: 25px;
      margin-bottom: 25px;
      border: 2px dashed var(--light-gray);
      transition: var(--transition);
    }
    
    .upload-box:hover {
      border-color: var(--primary);
    }
    
    .form-group {
      margin-bottom: 20px;
    }
    
    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      color: var(--dark);
    }
    
    .file-input-container {
      position: relative;
      display: flex;
      align-items: center;
    }
    
    .file-input-label {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 30px;
      background: white;
      border-radius: var(--border-radius);
      border: 2px dashed var(--light-gray);
      cursor: pointer;
      transition: var(--transition);
      width: 100%;
      text-align: center;
    }
    
    .file-input-label:hover {
      border-color: var(--primary);
      background: rgba(67, 97, 238, 0.05);
    }
    
    .file-input-label i {
      font-size: 42px;
      color: var(--primary);
      margin-bottom: 15px;
    }
    
    .file-input-label span {
      color: var(--gray);
      font-size: 16px;
    }
    
    .file-input-label .browse-text {
      color: var(--primary);
      font-weight: 600;
      margin-top: 5px;
    }
    
    input[type="file"] {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      opacity: 0;
      cursor: pointer;
    }
    
    .file-name {
      margin-top: 10px;
      font-size: 14px;
      color: var(--gray);
      text-align: center;
    }
    
    .url-input {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--light-gray);
      border-radius: var(--border-radius);
      font-size: 16px;
      transition: var(--transition);
    }
    
    .url-input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
    }
    
    .submit-btn {
      background: linear-gradient(to right, var(--primary), var(--secondary));
      color: white;
      border: none;
      border-radius: var(--border-radius);
      padding: 16px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
    }
    
    .submit-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
    }
    
    .submit-btn:active {
      transform: translateY(0);
    }
    
    .progress-container {
      background: white;
      border-radius: var(--border-radius);
      padding: 20px;
      margin-top: 20px;
      display: none;
      box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    }
    
    .progress-container.visible {
      display: block;
    }
    
    .progress-info {
      display: flex;
      justify-content: space-between;
      margin-bottom: 10px;
      font-size: 14px;
    }
    
    .progress-bar {
      height: 10px;
      background: var(--light-gray);
      border-radius: 5px;
      overflow: hidden;
    }
    
    .progress-fill {
      height: 100%;
      background: linear-gradient(to right, var(--success), var(--primary));
      width: 0%;
      border-radius: 5px;
      transition: width 0.4s ease;
    }
    
    .result-container {
      background: white;
      border-radius: var(--border-radius);
      padding: 20px;
      margin-top: 20px;
      display: none;
      box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    }
    
    .result-container.visible {
      display: block;
    }
    
    .success {
      color: #2a9d8f;
      background: rgba(42, 157, 143, 0.1);
      padding: 15px;
      border-radius: var(--border-radius);
      border-left: 4px solid #2a9d8f;
    }
    
    .error {
      color: var(--danger);
      background: rgba(247, 37, 133, 0.1);
      padding: 15px;
      border-radius: var(--border-radius);
      border-left: 4px solid var(--danger);
    }
    
    .instructions {
      background: var(--light);
      border-radius: var(--border-radius);
      padding: 25px;
    }
    
    .instructions h3 {
      margin-bottom: 15px;
      color: var(--dark);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    
    .instructions ul {
      list-style-type: none;
      padding-left: 5px;
    }
    
    .instructions li {
      margin-bottom: 10px;
      padding-left: 25px;
      position: relative;
    }
    
    .instructions li:before {
      content: "•";
      color: var(--primary);
      font-weight: bold;
      position: absolute;
      left: 0;
    }
    
    @media (max-width: 600px) {
      .header {
        padding: 20px 15px;
      }
      
      .content {
        padding: 20px 15px;
      }
      
      .upload-box {
        padding: 20px;
      }
    }