body {
            font-family: "Microsoft YaHei", Arial, sans-serif;
            max-width: 900px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f5f5f5;
        }
        .container {
            background-color: white;
            border-radius: 10px;
            padding: 30px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 30px;
        }
        .upload-area {
            border: 2px dashed #2196F3;
            border-radius: 10px;
            padding: 30px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
            margin-bottom: 25px;
        }
        .upload-area:hover {
            background-color: #f0f8ff;
            border-color: #0d8aee;
        }
        .input-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: #555;
        }
        input, textarea, button {
            width: 100%;
            padding: 12px;
            font-size: 16px;
            border: 1px solid #ddd;
            border-radius: 5px;
            box-sizing: border-box;
        }
        textarea {
            min-height: 200px;
            font-family: "Consolas", "Courier New", monospace;
            resize: vertical;
        }
        button {
            background-color: #2196F3;
            color: white;
            border: none;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s;
            margin-top: 10px;
        }
        button:hover {
            background-color: #0d8aee;
        }
        .hidden {
            display: none;
        }
        .result-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 20px;
        }
        .copy-btn {
            background-color: #4CAF50;
            width: auto;
            padding: 8px 15px;
        }
        .copy-btn:hover {
            background-color: #45a049;
        }