/* Loading 背景遮罩 */
#loading-backdrop {
    background-color: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: fade-in 0.2s ease-in-out;
}

/* Loading 指示器容器 */
#loading-indicator {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    animation: scale-in 0.3s ease-out;
}

/* Loading 动画 */
@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes scale-in {
    from {
        transform: translate(-50%, -50%) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
}

/* 按钮加载状态 */
.btn-loading {
    position: relative;
    pointer-events: none;
}

.btn-loading .spinner-border {
    animation: spinner-grow 0.75s linear infinite;
}

/* 淡出动画 */
.fade {
    transition: opacity 0.15s linear;
}

.fade.show {
    opacity: 1;
}

/* Loading 消息样式 */
.loading-message {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--bs-primary);
}

/* Loading 图标动画 */
.spinner-border {
    --bs-spinner-width: 1.2rem;
    --bs-spinner-height: 1.2rem;
    --bs-spinner-border-width: 2px;
}

/* 过渡效果 */
.transition-all {
    transition: all 0.3s ease;
}