/* 遮罩层 */
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(4px);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.4s ease, visibility 0.4s ease;
        }

        .overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* 弹出窗 */
        .modal {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(0.6);
            width: 480px;
            max-width: 90vw;
            max-height: 90vh;
            background: #fff;
            border-radius: 20px;
            z-index: 1001;
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
            box-shadow: 0 25px 80px rgba(0, 0, 0, 0.3);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .modal.active {
            opacity: 1;
            visibility: visible;
            transform: translate(-50%, -50%) scale(1);
        }

        /* 关闭动画 */
        .modal.closing {
            opacity: 0;
            transform: translate(-50%, -50%) scale(0.6);
            transition: all 0.3s ease-in;
        }

        .overlay.closing {
            opacity: 0;
            transition: opacity 0.3s ease-in;
        }

        /* 弹窗头部 */
        .modal-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            padding: 28px 30px 22px;
            position: relative;
        }

        .modal-header h2 {
            color: #fff;
            font-size: 22px;
            font-weight: 600;
            letter-spacing: 1px;
        }

        .modal-header p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 13px;
            margin-top: 6px;
        }

        .btn-close {
            position: absolute;
            top: 16px;
            right: 18px;
            width: 36px;
            height: 36px;
            background: rgba(255, 255, 255, 0.2);
            border: none;
            border-radius: 50%;
            color: #fff;
            font-size: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .btn-close:hover {
            background: rgba(255, 255, 255, 0.35);
            transform: rotate(90deg);
        }

        /* 弹窗内容 */
        .modal-body {
            padding: 30px;
            overflow-y: auto;
            flex: 1;
            max-height: calc(90vh - 120px);
        }

        /* 滚动条美化 */
        .modal-body::-webkit-scrollbar {
            width: 6px;
        }

        .modal-body::-webkit-scrollbar-track {
            background: transparent;
        }

        .modal-body::-webkit-scrollbar-thumb {
            background: rgba(102, 126, 234, 0.3);
            border-radius: 3px;
        }

        .modal-body::-webkit-scrollbar-thumb:hover {
            background: rgba(102, 126, 234, 0.5);
        }

        .form-group {
            margin-bottom: 22px;
            position: relative;
        }

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

        .form-group label .required {
            color: #f5576c;
            margin-left: 2px;
        }

        .form-group input,
        .form-group textarea {
            width: 91%;
            padding: 12px 16px;
            border: 2px solid #e8e8e8;
            border-radius: 10px;
            font-size: 15px;
            color: #333;
            background: #fafafa;
            transition: all 0.3s ease;
            outline: none;
            font-family: inherit;
        }

        .form-group input:focus,
        .form-group textarea:focus {
            border-color: #667eea;
            background: #fff;
            box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
        }

        .form-group textarea {
            resize: vertical;
            min-height: 100px;
            line-height: 1.6;
        }

        /* 错误提示 */
        .error-msg {
            color: #f5576c;
            font-size: 12px;
            margin-top: 6px;
            display: none;
            align-items: center;
            gap: 4px;
        }

        .error-msg::before {
            content: '⚠';
            font-size: 13px;
        }

        /* 验证失败样式 */
        .form-group.error input,
        .form-group.error textarea {
            border-color: #f5576c;
            background: #fff5f5;
            animation: shake 0.4s ease;
        }

        .form-group.error .error-msg {
            display: flex;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            20% { transform: translateX(-6px); }
            40% { transform: translateX(6px); }
            60% { transform: translateX(-4px); }
            80% { transform: translateX(4px); }
        }

        /* 提交按钮 */
        .btn-submit {
            width: 100%;
            padding: 14px;
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: none;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            letter-spacing: 2px;
            margin-top: 4px;
        }

        .btn-submit:hover {
            box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
            transform: translateY(-2px);
        }

        .btn-submit:active {
            transform: translateY(0);
        }

        /* 提交成功提示 */
        .success-toast {
            position: fixed;
            top: 30px;
            left: 50%;
            transform: translateX(-50%) translateY(-100px);
            background: #2ecc71;
            color: #fff;
            padding: 16px 32px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 500;
            box-shadow: 0 10px 30px rgba(46, 204, 113, 0.4);
            z-index: 2000;
            opacity: 0;
            transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
        }

        .success-toast.show {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }