/* 添加禁止滚动样式*/
        html,
        body {
            overflow: hidden;
            height: 100%;
        
        }

     * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', sans-serif;
        }

        body {
          
            
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .card {

          margin-top: -65px; 
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(50,50,93,0), 0 5px 15px rgba(0,0,0,0);
            padding: 3rem 2.5rem;
            max-width: 450px;
            width: 80%;
            transition: transform 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
        }

        .page-title {
            color: #2c3e50;
            text-align: center;
            font-size: 1.8rem;
            font-weight: 500;
            margin-bottom: 2rem;
            position: relative;
        }

        .page-title::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: -8px;
            width: 60px;
            height: 3px;
            background: #3498db;
            transform: translateX(-50%);
        }

        .form-group {
            margin-bottom: 1.8rem;
            position: relative;
        }

        .input-field {
            width: 100%;
            padding: 14px 20px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 1rem;
            background: transparent;
            outline: none;
            transition: 0.3s ease;
        }

        .input-label {
            position: absolute;
            left: 20px;
            top: 50%;
            transform: translateY(-50%);
            color: #7f8c8d;
            font-size: 0.9rem;
            pointer-events: none;
            transition: 0.3s ease;
        }

        .input-field:focus ~ .input-label,
        .input-field:not(:placeholder-shown) ~ .input-label {
            top: -12px;
            font-size: 0.8rem;
            color: #3498db;
        }

        .input-field:focus {
            border-color: #3498db;
            box-shadow: 0 0 12px rgba(52, 152, 219, 0.15);
        }

        .submit-btn {
            width: 100%;
            padding: 14px;
            border: none;
            border-radius: 25px;
            font-size: 1rem;
            color: white;
            background: linear-gradient(135deg, #3498db, #2980b9);
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
            cursor: pointer;
            transition: 0.3s ease;
        }

        .submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(52, 152, 219, 0.4);
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }

        .error-message {
            color: #e74c3c;
            text-align: center;
            font-size: 0.85rem;
            margin-top: 1rem;
        }

        .captcha-container {
            display: flex;
            align-items: center;
        }

        #captcha {
            padding: 10px 18px;
            border: 1px solid #e0e0e0;
            border-radius: 6px;
            margin-left: 1rem;
            cursor: pointer;
            font-size: 1.1rem;
            transition: all 0.3s ease;
        }

        #captcha:hover {
            background: #f8f9fa;
            transform: scale(1.02);
        }

        .switch-link {
            text-align: center;
            margin-top: 1.5rem;
            color: #7f8c8d;
        }

        .switch-link a {
            color: #3498db;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .switch-link a:hover {
            color: #2980b9;
        }