/* 基础重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Helvetica Neue', Arial, sans-serif;
            background-color: #f4f7f6;
            color: #333;
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 头部样式 */
        .header {
            position: fixed;
            width: 100%;
            top: 0;
            left: 0;
            background-color: rgba(255, 255, 255, 0.95);
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            backdrop-filter: blur(10px);
        }

        .header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .logo img {
            height: 50px;
            margin: 2px 0;
        }

        .navbar ul {
            list-style-type: none;
            display: flex;
        }

        .navbar ul li {
            margin-left: 25px;
        }

        .navbar ul li a {
            text-decoration: none;
            color: #2c3e50;
            font-weight: 600;
            font-size: 16px;
            transition: color 0.3s ease;
        }

        .navbar ul li a:hover {
            color: #3498db;
        }

        /* 主体内容区（预留空间给固定头部） */
        .main-content {
            margin-top: 90px; /* 为固定头部留出空间 */
            padding: 2rem 0;
            min-height: calc(100vh - 160px);
        }

        /* 工具容器样式 */
        .tool-container {
            background: white;
            border-radius: 12px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            padding: 30px;
            margin-bottom: 30px;
        }

        h1 {
            text-align: center;
            color: #2c3e50;
            margin-bottom: 25px;
            font-size: 28px;
            font-weight: 700;
        }

        .instructions {
            background-color: #e8f4fc;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 25px;
            border-left: 5px solid #3498db;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }

        .instructions p {
            margin-bottom: 10px;
            font-size: 15px;
        }

        .instructions ol {
            padding-left: 20px;
            margin: 10px 0;
        }

        .instructions li {
            margin-bottom: 8px;
            line-height: 1.5;
        }

        .upload-area {
            border: 3px dashed #3498db;
            padding: 50px;
            text-align: center;
            margin: 25px 0;
            cursor: pointer;
            background-color: #f8fbff;
            border-radius: 12px;
            transition: all 0.3s;
            position: relative;
        }

        .upload-area:hover {
            background-color: #eaf5ff;
            border-color: #2980b9;
            transform: translateY(-2px);
        }

        .upload-area h3 {
            color: #2c3e50;
            margin-bottom: 10px;
            font-size: 20px;
        }

        #fileInput {
            display: none;
        }

        .btn-container {
            text-align: center;
            margin: 25px 0;
        }

        .btn {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 14px 30px;
            cursor: pointer;
            border-radius: 8px;
            font-size: 16px;
            margin: 0 10px;
            transition: all 0.3s;
            display: inline-block;
            font-weight: 600;
            box-shadow: 0 4px 6px rgba(52, 152, 219, 0.2);
        }

        .btn:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
            box-shadow: 0 6px 8px rgba(52, 152, 219, 0.3);
        }

        .btn:disabled {
            background-color: #bdc3c7;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .btn-download {
            background-color: #27ae60;
            box-shadow: 0 4px 6px rgba(39, 174, 96, 0.2);
        }

        .btn-download:hover {
            background-color: #219653;
            box-shadow: 0 6px 8px rgba(39, 174, 96, 0.3);
        }

        #downloadContainer {
            margin-top: 30px;
            padding: 25px;
            border: 1px solid #e0e6ed;
            border-radius: 10px;
            background-color: #f9fbfd;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }

        #downloadContainer h2 {
            color: #2c3e50;
            margin-bottom: 15px;
            font-size: 22px;
        }

        .status {
            margin-top: 20px;
            padding: 15px 20px;
            border-radius: 8px;
            display: none;
            font-weight: 500;
            animation: fadeIn 0.3s ease;
        }

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

        .success {
            background-color: #d5f0e3;
            color: #1d6f42;
            border: 1px solid #a8d8ba;
        }

        .error {
            background-color: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }

        .table-container {
            margin-top: 25px;
            overflow-x: auto;
            border: 1px solid #e0e6ed;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            min-width: 800px;
        }

        table, th, td {
            border: 1px solid #e0e6ed;
            padding: 12px 15px;
            text-align: left;
        }

        th {
            background-color: #3498db;
            color: white;
            font-weight: 600;
            position: sticky;
            top: 0;
        }

        tr:nth-child(even) {
            background-color: #f8fbff;
        }

        tr:hover {
            background-color: #eaf5ff;
        }

        .file-name {
            font-weight: 600;
            color: #2980b9;
        }

        .supplier-group {
            margin-bottom: 20px;
            padding: 15px;
            border: 1px solid #e0e6ed;
            border-radius: 8px;
            background-color: #f9fbfd;
        }

        .supplier-group h3 {
            margin-bottom: 12px;
            color: #2c3e50;
            font-size: 18px;
        }

        .hidden {
            display: none;
        }

        /* 页脚样式 */
        .footer {
            background-color: #2c3e50;
            color: white;
            text-align: center;
            padding: 20px 0;
            margin-top: auto;
        }

        .footer p {
            margin: 5px 0;
            font-size: 14px;
        }
        .footer p {
    margin: 5px 0;
}
.footer a {
    color: #ffffff;           /* 默认灰色 */
    text-decoration: none; /* 去掉下划线（可选） */
    transition: color 0.2s ease;
}

.footer a:hover {
    color: #444;           /* 鼠标悬停时稍深一点，保持低调 */
}

.footer a:visited {
    color: #777;           /* 访问过后依然是柔和的灰色，不刺眼 */
}

        /* 响应式设计 */
        @media (max-width: 768px) {
            .header .container {
                flex-direction: column;
                height: auto;
                padding: 10px 0;
            }
            
            .navbar ul {
                margin-top: 15px;
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .navbar ul li {
                margin: 5px 10px;
            }
            
            .main-content {
                margin-top: 150px;
            }
            
            .btn {
                display: block;
                width: 90%;
                margin: 10px auto;
                padding: 12px;
            }
            
            .tool-container {
                padding: 20px;
            }
            
            h1 {
                font-size: 24px;
            }
        }