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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
            -webkit-text-size-adjust: 100% !important;
            text-size-adjust: 100% !important;
            -moz-text-size-adjust: 100% !important;
        }

        .container {
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            width: 90%;
            max-width: 500px;
            padding: 20px;
        }

        .header {
            background: linear-gradient(135deg, #4a6cf7, #7c4dff);
            color: white;
            padding: 20px;
            border-radius: 8px;
            text-align: center;
            margin-bottom: 20px;
        }

        .header h1 {
            font-size: 24px;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .header p {
            font-size: 14px;
            opacity: 0.9;
        }

        .upload-area {
            border: 2px dashed #c7c7ff;
            border-radius: 8px;
            padding: 40px 20px;
            text-align: center;
            margin-bottom: 20px;
            transition: border-color 0.3s ease;
        }

        .upload-area.dragover {
            border-color: #4a6cf7;
            background-color: #f9f9ff;
        }

        .upload-icon {
            font-size: 48px;
            color: #7c4dff;
            margin-bottom: 15px;
        }

        .upload-text {
            font-size: 16px;
            color: #666;
            margin-bottom: 20px;
        }

        .upload-btn {
            background: linear-gradient(135deg, #4a6cf7, #7c4dff);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 25px;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-block;
            -webkit-tap-highlight-color: transparent;
            user-select: none;
            -webkit-user-select: none;
        }

        .upload-btn:active {
            transform: scale(0.95);
            box-shadow: 0 4px 12px rgba(74, 108, 247, 0.4);
        }

        .file-preview-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
            justify-content: center;
        }

        .file-preview-item {
            background: #f0f0ff;
            border-radius: 6px;
            padding: 6px 10px;
            font-size: 12px;
            color: #4a6cf7;
            display: flex;
            align-items: center;
            gap: 6px;
            max-width: 140px;
            overflow: hidden;
            white-space: nowrap;
            text-overflow: ellipsis;
        }

        .file-preview-item .remove-file {
            cursor: pointer;
            font-weight: bold;
            color: #e54d42;
            font-size: 14px;
            line-height: 1;
            flex-shrink: 0;
        }

        .progress-section {
            margin-bottom: 20px;
        }

        .progress-text {
            text-align: center;
            margin-bottom: 10px;
            font-size: 14px;
            color: #666;
        }

        .progress-bar {
            width: 100%;
            height: 8px;
            background-color: #f0f0f0;
            border-radius: 4px;
            overflow: hidden;
        }

        .progress-fill {
            width: 0%;
            height: 100%;
            background: linear-gradient(90deg, #4a6cf7, #7c4dff);
            transition: width 0.3s ease;
        }

        .submit-btn {
            width: 100%;
            background-color: #e0e0e0;
            color: #999;
            border: none;
            padding: 12px;
            border-radius: 25px;
            font-size: 16px;
            cursor: not-allowed;
            transition: all 0.3s ease;
            margin-bottom: 20px;
            -webkit-tap-highlight-color: transparent;
            user-select: none;
            -webkit-user-select: none;
        }

        .submit-btn.active {
            background: linear-gradient(135deg, #4a6cf7, #7c4dff);
            color: white;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(74, 108, 247, 0.3);
        }

        .submit-btn.active:active {
            transform: scale(0.97);
            box-shadow: 0 2px 8px rgba(74, 108, 247, 0.2);
        }

        .instructions {
            background-color: #f9f9ff;
            border-left: 4px solid #7c4dff;
            padding: 15px;
            border-radius: 0 8px 8px 0;
            margin-bottom: 20px;
        }

        .instructions h3 {
            color: #7c4dff;
            margin-bottom: 10px;
            font-size: 16px;
        }

        .instructions ul {
            list-style-type: disc;
            margin-left: 20px;
            font-size: 14px;
            color: #666;
        }

        .instructions li {
            margin-bottom: 5px;
        }

        .footer {
            text-align: center;
            font-size: 12px;
            color: #999;
        }

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