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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }
        /* 微信提示弹窗动画 */
        #wechat-mask {
            animation: fadeIn 0.3s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        #wechat-mask button:active {
            transform: scale(0.96);
        }
        /* 主容器 */
        .container {
            max-width: 600px;
            margin: 0 auto;
        }

        /* 卡片样式 */
        .card {
            background: white;
            border-radius: 32px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
            overflow: hidden;
        }

        .card-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            padding: 32px 24px;
            text-align: center;
        }

        .card-header h1 {
            color: white;
            font-size: 28px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .card-header p {
            color: rgba(255,255,255,0.9);
            font-size: 14px;
            margin-top: 8px;
        }

        .card-body {
            padding: 32px 24px;
        }

        /* 表单样式 */
        .form-group {
            margin-bottom: 24px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #333;
            font-size: 14px;
        }

        .form-group input {
            width: 100%;
            padding: 14px 18px;
            border: 2px solid #e5e7eb;
            border-radius: 20px;
            font-size: 16px;
            transition: all 0.3s;
            background: #f9fafb;
        }

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

        .form-group input::placeholder {
            color: #bbb;
        }

        /* 按钮样式 */
        .btn {
            width: 100%;
            padding: 14px;
            border: none;
            border-radius: 24px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(102,126,234,0.3);
        }

        .btn:disabled {
            opacity: 0.6;
            transform: none;
            cursor: not-allowed;
        }

        /* 消息提示 */
        .message {
            padding: 14px 18px;
            border-radius: 20px;
            margin-top: 20px;
            display: none;
            font-size: 14px;
            line-height: 1.5;
        }

        .message.success {
            background: #d1fae5;
            color: #065f46;
            border: 1px solid #a7f3d0;
            display: block;
        }

        .message.error {
            background: #fee2e2;
            color: #991b1b;
            border: 1px solid #fecaca;
            display: block;
        }

        /* 文件列表 */
        .files-section {
            margin-top: 28px;
            padding-top: 24px;
            border-top: 2px solid #f0f0f0;
            display: none;
        }

        .files-title {
            font-weight: 600;
            margin-bottom: 16px;
            color: #333;
            font-size: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .file-item {
            background: #f8f9fa;
            border-radius: 20px;
            padding: 16px;
            margin-bottom: 14px;
            transition: all 0.2s;
            border: 1px solid #e5e7eb;
        }

        .file-item:hover {
            background: #f0f4ff;
            transform: translateX(5px);
            border-color: #667eea;
        }

        .file-name {
            font-size: 16px;
            font-weight: 600;
            color: #333;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 8px;
        }

        .file-size {
            font-size: 12px;
            color: #888;
            margin-bottom: 12px;
        }

        .download-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #10b981;
            color: white;
            padding: 10px 20px;
            border-radius: 40px;
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.2s;
        }

        .download-btn:hover {
            background: #059669;
            transform: translateY(-2px);
        }

        .extract-code {
            font-size: 12px;
            color: #f59e0b;
            margin-top: 10px;
            padding: 6px 12px;
            background: #fffbeb;
            border-radius: 20px;
            display: inline-block;
        }

        .remaining-info {
            margin-top: 16px;
            padding: 10px 14px;
            background: #e0f2fe;
            border-radius: 16px;
            font-size: 12px;
            color: #0369a1;
            text-align: center;
        }

        /* 加载动画 */
        .loading {
            display: inline-block;
            width: 18px;
            height: 18px;
            border: 2px solid white;
            border-radius: 50%;
            border-top-color: transparent;
            animation: spin 0.6s linear infinite;
            vertical-align: middle;
            margin-right: 8px;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* 模态框 */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            justify-content: center;
            align-items: center;
            z-index: 1000;
            padding: 20px;
        }

        .modal-content {
            background: white;
            border-radius: 32px;
            max-width: 480px;
            width: 100%;
            max-height: 80vh;
            overflow-y: auto;
            padding: 24px;
        }

        .modal-header {
            font-size: 20px;
            font-weight: 700;
            text-align: center;
            padding-bottom: 16px;
            border-bottom: 2px solid #f0f0f0;
            margin-bottom: 16px;
        }

        .order-option {
            padding: 16px;
            margin: 10px 0;
            border: 2px solid #e5e7eb;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .order-option:hover {
            border-color: #667eea;
            background: #f8f9ff;
        }

        .order-option.selected {
            border-color: #667eea;
            background: linear-gradient(135deg, #f0f4ff 0%, #e8edff 100%);
        }

        .order-number {
            font-weight: 600;
            font-size: 15px;
            color: #333;
            margin-bottom: 5px;
        }

        .order-info {
            font-size: 12px;
            color: #888;
        }

        .modal-buttons {
            display: flex;
            gap: 12px;
            margin-top: 20px;
        }

        .modal-buttons button {
            flex: 1;
            padding: 12px;
            border-radius: 40px;
            font-size: 14px;
        }

        .btn-cancel {
            background: #f3f4f6;
            color: #4b5563;
        }

        .btn-cancel:hover {
            background: #e5e7eb;
            transform: none;
        }

        /* 响应式 */
        @media (max-width: 480px) {
            .card-header { padding: 24px 20px; }
            .card-header h1 { font-size: 24px; }
            .card-body { padding: 24px 20px; }
            .file-name { font-size: 14px; }
        }