/* Toast通知样式 */
    .toast {
        position: fixed;
        top: 20px;
        left: 50%;
        transform: translateX(-50%);
        padding: 15px 25px;
        border-radius: 8px;
        color: white;
        font-weight: 500;
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        z-index: 9999;
        opacity: 0;
        transition: opacity 0.3s, top 0.3s;
        text-align: center;
        max-width: 90%;
        font-size: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }
    
    .toast.show {
        opacity: 1;
        top: 30px;
    }
    
    .toast.success {
        background: linear-gradient(135deg, #0ec679, #07b15f);
    }
    
    .toast.error {
        background: linear-gradient(135deg, #ff6b6b, #e94b4b);
    }
    
    .toast.warning {
        background: linear-gradient(135deg, #ffb142, #ff9f1a);
    }
    
    .toast.info {
        background: linear-gradient(135deg, #3498db, #2980b9);
    }
    
    .toast-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .toast-title {
        font-weight: bold;
        font-size: 18px;
        margin-bottom: 5px;
    }
    
    .toast-message {
        font-size: 15px;
        opacity: 0.9;
    }
    
    /* 按钮加载状态 */
    .btn-loading {
        position: relative;
        pointer-events: none;
    }
    
    .btn-loading::after {
        content: "";
        position: absolute;
        top: 50%;
        left: 50%;
        width: 20px;
        height: 20px;
        margin: -10px 0 0 -10px;
        border: 3px solid rgba(255,255,255,0.3);
        border-top-color: white;
        border-radius: 50%;
        animation: spin 0.8s linear infinite;
    }
    
    @keyframes spin {
        to { transform: rotate(360deg); }
    }
    
    /* 表单错误提示 */
    .error-hint {
        color: #ff6b6b;
        font-size: 13px;
        margin-top: 5px;
        text-align: left;
        width: 100%;
        padding-left: 5px;
    }
    
    .input-error {
        border: 1px solid #ff6b6b !important;
        background: rgba(255, 107, 107, 0.1) !important;
    }