:root {
            --primary-color: #232f3e; /* 亚马逊深蓝 */
            --secondary-color: #ff9900; /* 亚马逊橙 */
            --bg-color: #f3f3f3;
            --text-color: #333;
            --border-color: #ddd;
        }

        body {
            font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            margin: 0;
            padding: 20px;
            line-height: 1.6;
        }

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

        h1 {
            color: var(--primary-color);
            margin-bottom: 10px;
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);

        }

        /* 上传区域样式 */
        .upload-section {
            border: 2px dashed var(--secondary-color);
            padding: 40px;
            text-align: center;
            border-radius: 8px;
            margin-bottom: 30px;
            background-color: #fff8f0;
            transition: all 0.3s;
        }

        .upload-section:hover {
            background-color: #fff0d6;
        }

        input[type="file"] {
            display: none;
        }

        .upload-btn {
            background-color: var(--secondary-color);
            color: white;
            padding: 12px 24px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
            font-weight: bold;
            box-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }

        .upload-btn:hover {
            background-color: #e88b00;
        }

        /* 结果表格样式 */
        .result-wrapper {
            margin-top: 30px;
            overflow-x: auto;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 10px;
        }

        th, td {
            border: 1px solid var(--border-color);
            padding: 10px;
            text-align: left;
            font-size: 14px;
        }

        /* 特定列宽 */
        .col-label { width: 20%; background-color: #f9f9f9; font-weight: bold; }
        .col-brl { width: 20%; background-color: #fff; }
        .col-gap { width: 5%; background-color: #fff; text-align: center; }
        .col-cny-label { width: 15%; background-color: #f9f9f9; color: #666; }
        .col-cny-val { width: 20%; background-color: #e8f5e9; font-weight: bold; color: #2e7d32; }
        .col-rate { width: 20%; }

        /* 汇率输入框 */
        .rate-input {
            width: 60px;
            padding: 4px;
            border: 1px solid #ccc;
            border-radius: 4px;
            text-align: center;
        }

        /* 金额输入框 */
        .money-input {
            width: 90%;
            padding: 6px;
            border: 1px solid transparent;
            font-family: inherit;
            font-size: inherit;
            color: inherit;
            background: transparent;
            text-align: right;
            border-radius: 4px;
            transition: border 0.2s;
        }

        .money-input:focus {
            border: 1px solid var(--secondary-color);
            background: white;
            outline: none;
        }

        .money-input:hover {
            background-color: #fafafa;
        }

        /* 利润行 */
        .profit-row {
            font-size: 18px;
            background-color: #f0f4c3 !important;
        }
        
        .profit-val {
            color: #d32f2f;
        }

        /* 按钮组 */
        .actions {
            margin-top: 20px;
            text-align: right;
        }

        .export-btn {
            background-color: var(--primary-color);
            color: white;
            padding: 12px 24px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .export-btn:hover {
            background-color: #1a242f;
        }

        .export-btn:disabled {
            background-color: #ccc;
            cursor: not-allowed;
        }

        /* 状态提示 */
        #status-msg {
            margin-top: 15px;
            font-size: 14px;
            color: #666;
            min-height: 20px;
        }
        
        .success { color: green; }
        .error { color: red; }