/* 页面加载动画 */
#loader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(15, 23, 42, 0);
    backdrop-filter: blur(0);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s;
    pointer-events: none;
    will-change: opacity;
}

#loader-wrapper.loader-visible {
    opacity: 1;
    visibility: visible;
    background-color: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(8px);
    pointer-events: auto;
}

@media (prefers-color-scheme: light) {
    #loader-wrapper.loader-visible {
        background-color: rgba(255, 255, 255, 0.6);
    }
}

.loader {
    width: 48px;
    height: 48px;
    border: 5px solid var(--primary-color);
    border-bottom-color: transparent;
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    position: relative; /* 确保加载器自身不会受其他定位影响 */
    margin: 0; /* 移除可能存在的默认外边距 */
}

.loader-hidden {
    opacity: 0 !important;
    visibility: hidden;
}

/* 入场动画 */
.fade-in-up {
    opacity: 0; /* 初始隐藏，防止有延迟时闪烁 */
    animation: fadeInUp 0.6s ease-out forwards;
}

@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}