* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
          'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        min-height: 100vh;
        padding: 20px;
        color: #333;
      }

      .container {
        max-width: 1200px;
        margin: 0 auto;
      }

      .header {
        text-align: center;
        color: white;
        margin-bottom: 30px;
      }

      .header h1 {
        font-size: 2.5em;
        margin-bottom: 10px;
        text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
      }

      .header p {
        font-size: 1.1em;
        opacity: 0.95;
      }

      .card {
        background: white;
        border-radius: 15px;
        padding: 30px;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
        margin-bottom: 30px;
      }

      .form-group {
        margin-bottom: 20px;
      }

      .form-group label {
        display: block;
        margin-bottom: 8px;
        font-weight: 600;
        color: #555;
        font-size: 14px;
      }

      .form-group input,
      .form-group select {
        width: 100%;
        padding: 12px;
        border: 2px solid #e0e0e0;
        border-radius: 8px;
        font-size: 14px;
        transition: all 0.3s;
      }

      .form-group input:focus,
      .form-group select:focus {
        outline: none;
        border-color: #667eea;
        box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
      }

      .radio-group {
        display: flex;
        gap: 20px;
        margin-top: 8px;
      }

      .radio-item {
        display: flex;
        align-items: center;
        cursor: pointer;
      }

      .radio-item input[type='radio'] {
        width: auto;
        margin-right: 6px;
        cursor: pointer;
      }

      .button-group {
        display: flex;
        gap: 15px;
        margin-top: 30px;
      }

      button {
        flex: 1;
        padding: 14px 30px;
        font-size: 16px;
        font-weight: 600;
        border: none;
        border-radius: 8px;
        cursor: pointer;
        transition: all 0.3s;
      }

      .btn-primary {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
      }

      .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
      }

      .btn-secondary {
        background: #f5f5f5;
        color: #666;
      }

      .btn-secondary:hover {
        background: #e0e0e0;
      }

      .btn-copy {
        background: #4caf50;
        color: white;
      }

      .btn-copy:hover {
        background: #45a049;
        transform: translateY(-2px);
        box-shadow: 0 5px 20px rgba(76, 175, 80, 0.4);
      }

      .btn-download {
        background: #ff9800;
        color: white;
      }

      .btn-download:hover {
        background: #f57c00;
        transform: translateY(-2px);
        box-shadow: 0 5px 20px rgba(255, 152, 0, 0.4);
      }

      button:disabled {
        opacity: 0.6;
        cursor: not-allowed;
        transform: none !important;
      }

      .result-section {
        display: none;
      }

      .result-section.show {
        display: block;
      }

      .result-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 15px;
        flex-wrap: wrap;
        gap: 15px;
      }

      .result-header h2 {
        color: #667eea;
        font-size: 1.5em;
        margin: 0;
      }

      .format-selector {
        display: flex;
        gap: 10px;
        background: #f5f5f5;
        padding: 5px;
        border-radius: 8px;
      }

      .format-radio {
        display: flex;
        align-items: center;
        cursor: pointer;
        padding: 5px 15px;
        border-radius: 6px;
        transition: all 0.3s;
        font-size: 14px;
        font-weight: 500;
      }

      .format-radio:hover {
        background: #e0e0e0;
      }

      .format-radio input[type='radio'] {
        margin-right: 6px;
        cursor: pointer;
      }

      .format-radio input[type='radio']:checked + span {
        color: #667eea;
        font-weight: 600;
      }

      .result-actions {
        display: flex;
        gap: 10px;
        margin-left: auto;
      }

      .result-actions button {
        flex: none;
        padding: 10px 20px;
        font-size: 14px;
      }

      .output-display {
        background: #1e1e1e;
        color: #d4d4d4;
        padding: 20px;
        border-radius: 8px;
        font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
        font-size: 13px;
        line-height: 1.6;
        overflow-x: auto;
        max-height: 600px;
        overflow-y: auto;
        white-space: pre-wrap;
        word-wrap: break-word;
      }

      .output-display.markdown-mode {
        background: #ffffff;
        color: #333;
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
          'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
        font-size: 14px;
        line-height: 1.8;
        border: 1px solid #e0e0e0;
      }

      .error-message {
        background: #ffebee;
        color: #c62828;
        padding: 15px;
        border-radius: 8px;
        border-left: 4px solid #c62828;
        margin-top: 20px;
        display: none;
      }

      .error-message.show {
        display: block;
      }

      .loading {
        text-align: center;
        padding: 20px;
        display: none;
      }

      .loading.show {
        display: block;
      }

      .loading-spinner {
        border: 3px solid #f3f3f3;
        border-top: 3px solid #667eea;
        border-radius: 50%;
        width: 40px;
        height: 40px;
        animation: spin 1s linear infinite;
        margin: 0 auto 10px;
      }

      @keyframes spin {
        0% {
          transform: rotate(0deg);
        }
        100% {
          transform: rotate(360deg);
        }
      }

      .info-box {
        background: #e3f2fd;
        border-left: 4px solid #2196f3;
        padding: 15px;
        border-radius: 8px;
        margin-bottom: 20px;
        font-size: 14px;
        color: #1565c0;
      }

      .date-input-group {
        display: none;
      }

      .date-input-group.active {
        display: block;
      }

      .example-text {
        font-size: 12px;
        color: #999;
        margin-top: 5px;
      }

      .footer {
        text-align: center;
        color: white;
        margin-top: 30px;
        opacity: 0.9;
      }

      .footer a {
        color: white;
        text-decoration: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.5);
      }

      .footer a:hover {
        border-bottom-color: white;
      }

      @media (max-width: 768px) {
        .header h1 {
          font-size: 1.8em;
        }

        .card {
          padding: 20px;
        }

        .button-group {
          flex-direction: column;
        }

        .result-header {
          flex-direction: column;
          align-items: flex-start;
          gap: 15px;
        }

        .format-selector {
          width: 100%;
          justify-content: center;
        }

        .result-actions {
          width: 100%;
          margin-left: 0;
        }

        .result-actions button {
          flex: 1;
        }
      }