/* ========================================
    博客转场动画 — 连续自然滚动
    Sticky Hero + 文档流 Blog
    ======================================== */

/* 页面滚动根容器 */
.page-scroller {
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    background: var(--bg, #fffef7);
    scrollbar-width: none;
}

.page-scroller::-webkit-scrollbar {
    display: none;
}

/* Hero 粘顶层：滚动时钉在视口顶部，通过 transform 沉入 3D 空间 */
.hero-sticky {
    position: sticky;
    top: 0;
    height: 100vh;
    width: 100vw;
    z-index: var(--z-content, 50);
    perspective: 1500px;
    transform-style: preserve-3d;
    overflow: hidden;
}

.hero-content {
    position: absolute;
    inset: 0;
    /* No permanent will-change: the 3D sink transform (translateZ inside the
       perspective on .hero-sticky) promotes this to its own layer on demand,
       and a permanent full-viewport layer with `will-change: filter` kept the
       browser tracking expensive filter rasterization forever. */
    backface-visibility: hidden;
}

/* ===== View Transitions — 页面导航动画 ===== */

@keyframes vt-content-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes vt-content-out {
    from {
        opacity: 1;
        transform: translateY(0);
    }

    to {
        opacity: 0;
        transform: translateY(-3px);
    }
}

.page-transition-surface {
    min-height: 100vh;
    padding: 4.5rem 2rem;
    background: var(--bg, #fffef7);
    position: relative;
    z-index: var(--z-content, 50);
}

::view-transition-old(page-content) {
    animation: vt-content-out 0.18s var(--curve-snap) both;
}

::view-transition-new(page-content) {
    animation: vt-content-in 0.32s var(--curve-delicate) both;
}

::view-transition-old(site-shell),
::view-transition-new(site-shell) {
    animation: none;
}

::view-transition-old(top-bar),
::view-transition-new(top-bar),
::view-transition-old(top-bar-popup),
::view-transition-new(top-bar-popup) {
    animation: none;
}

::view-transition-group(top-bar),
::view-transition-group(top-bar-popup) {
    animation-duration: 0s;
}

/* ===== Top navigation progress ===== */

.navigation-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    z-index: calc(var(--z-loading, 9998) + 2);
    pointer-events: none;
    opacity: 0;
    transform: translateY(-3px);
    transition:
        opacity 0.16s var(--curve-snap),
        transform 0.16s var(--curve-snap);
}

.navigation-progress--visible {
    opacity: 1;
    transform: translateY(0);
}

.navigation-progress__bar {
    width: 100%;
    height: 100%;
    transform: scaleX(0);
    transform-origin: left center;
    background: linear-gradient(90deg, var(--accent-blue, #3e59ff), var(--accent-yellow, #ffe600));
    box-shadow: 0 0 18px color-mix(in srgb, var(--accent-blue, #3e59ff) 55%, transparent);
    transition: transform 0.18s var(--curve-snap);
}

.navigation-progress--done .navigation-progress__bar {
    transition-duration: 0.12s;
}

@media (prefers-reduced-motion: reduce) {
    .navigation-progress,
    .navigation-progress__bar {
        transition: none;
    }

    html.is-entering .left-panel,
    html.is-entering .top-bar {
        opacity: 1;
        transform: none;
    }
}

.left-panel-content-leave-active {
    transition:
        opacity 0.18s var(--curve-snap),
        transform 0.18s var(--curve-snap);
}

.left-panel-content-leave-to {
    opacity: 0;
    transform: translateY(-4px);
}

/* 客户端切页时为新标题提供细腻的浮现与微位移过渡；首屏（html.is-entering）则由 layout.css 中的错峰入场接管 */
html:not(.is-entering) .left-panel-content-enter-active {
    transition:
        opacity 0.26s var(--curve-delicate),
        transform 0.26s var(--curve-delicate);
}

html:not(.is-entering) .left-panel-content-enter-from {
    opacity: 0;
    transform: translateY(6px);
}

html.is-entering .left-panel-content-enter-active {
    transition: none;
}

@media (prefers-reduced-motion: reduce) {
    ::view-transition-old(page-content),
    ::view-transition-new(page-content) {
        animation-duration: 0.01ms !important;
        animation-name: none !important;
    }

    .left-panel-content-enter-active,
    .left-panel-content-leave-active {
        transition: none !important;
        filter: none !important;
        transform: none !important;
    }

    .left-panel-content-enter-from,
    .left-panel-content-leave-to {
        opacity: 1 !important;
        transform: none !important;
        filter: none !important;
    }

    html.is-entering .left-panel .hero > .avatar-box,
    html.is-entering .left-panel .hero > .name,
    html.is-entering .left-panel .hero > .status-bar,
    html.is-entering .left-panel .hero > .bio-container,
    html.is-entering .left-panel .hero > .social-links,
    html.is-entering .left-panel .hero > .social-links-wrapper {
        opacity: 1;
        transform: none;
    }

    html:not(.is-entering) .left-panel .hero > .avatar-box,
    html:not(.is-entering) .left-panel .hero > .name,
    html:not(.is-entering) .left-panel .hero > .status-bar,
    html:not(.is-entering) .left-panel .hero > .bio-container,
    html:not(.is-entering) .left-panel .hero > .social-links,
    html:not(.is-entering) .left-panel .hero > .social-links-wrapper {
        animation: none;
    }
}