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pre
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/* 动画与过渡效果 

 * 包含网站中所有动画相关样式，如展开/收起、淡入等效果

 */

/* 折叠面板动画 - 使用will-change提高性能 */
.accordion-content {
    will-change: transform, opacity, max-height;
    transform-origin: top;
    backface-visibility: hidden;
}

.accordion-icon {
    will-change: transform;
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1); /* 弹性过渡 */
}

/* 平滑展开/收起的时间函数 */
.accordion-expand {
    animation-timing-function: cubic-bezier(0.17, 0.84, 0.44, 1);
}

.accordion-collapse {
    animation-timing-function: cubic-bezier(0.6, 0.04, 0.98, 0.34);
}

/* 展开动画：从0高度逐渐展开到全高 */
@keyframes smoothExpand {
    0% { 
        max-height: 0;
        opacity: 0;
        transform: scaleY(0.95); 
    }
    50% { 
        opacity: 0.5;
    }
    100% { 
        max-height: 2000px;
        opacity: 1;
        transform: scaleY(1); 
    }
}

/* 收起动画：从全高逐渐收起到0高度 */
@keyframes smoothCollapse {
    0% { 
        max-height: 2000px;
        opacity: 1;
        transform: scaleY(1); 
    }
    30% { 
        opacity: 0.7;
    }
    100% { 
        max-height: 0;
        opacity: 0;
        transform: scaleY(0.95); 
    }
}

/* 淡入动画 - 用于元素出现时的平滑过渡 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.15s ease-in-out;
}

/* 单次弹跳动画 - 用于吸引注意力 */
@keyframes ping-once {
    0% {
        transform: scale(0.95);
        opacity: 0.8;
    }
    30% {
        transform: scale(1.2);
        opacity: 0.5;
    }
    70% {
        transform: scale(0.95);
        opacity: 0.3;
    }
    100% {
        transform: scale(1);
        opacity: 0;
    }
}

.animate-ping-once {
    animation: ping-once 0.8s cubic-bezier(0, 0, 0.2, 1) forwards;
}