/* ========== 页面加载 & 切换动画 ========== */

/* 加载遮罩层 */
.page-loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: var(--bg-color);
    pointer-events: all;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    opacity: 1;
    visibility: visible;
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* 禅圆动画 */
.loader-ring {
    width: 80px;
    height: 80px;
    position: relative;
    margin-bottom: 28px;
}

.loader-ring::before {
    content: '';
    position: absolute;
    inset: 0;
    border: 2px solid var(--divider-color);
    border-radius: 50%;
    opacity: 0.4;
}

.loader-ring::after {
    content: '';
    position: absolute;
    inset: 0;
    border: 2px solid transparent;
    border-top-color: var(--text-color);
    border-radius: 50%;
    animation: loaderSpin 1.2s cubic-bezier(0.4, 0.0, 0.2, 1) infinite;
}

/* 加载文字 */
.loader-text {
    font-family: 'Noto Serif SC', "Source Han Serif SC", "Source Han Serif CN", serif;
    font-size: 18px;
    font-weight: 900;
    color: var(--text-color);
    letter-spacing: 2px;
    opacity: 0;
    animation: loaderFadeIn 0.5s ease 0.3s forwards;
}

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

@keyframes loaderFadeIn {
    to { opacity: 1; }
}

/* 页面切换遮罩 */
.page-transition {
    position: fixed;
    inset: 0;
    z-index: 9998;
    background-color: var(--bg-color);
    pointer-events: all;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.page-transition.active {
    opacity: 1;
    visibility: visible;
}

/* 全局页面进入动画（仅 opacity，避免 transform 破坏 fixed 定位） */
body.page-enter {
    animation: pageEnter 0.6s ease both;
}

@keyframes pageEnter {
    from { opacity: 0; }
    to   { opacity: 1; }
}