:root {
    --vt-duration: 380ms;
    --reveal-ease: cubic-bezier(0.22, 1, 0.36, 1);
    --edge-fade: color-mix(in srgb, var(--panel) 0%, transparent);
}

@supports (color: oklch(0.5 0.1 40)) {
    :root {
        --ink: oklch(0.28 0.02 55);
        --chenxiang: oklch(0.42 0.05 55);
        --cinnabar: oklch(0.52 0.17 25);
        --panel: oklch(0.97 0.01 85);
        --xuan: oklch(0.94 0.015 85);
    }
}

@view-transition {
    navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
    animation-duration: var(--vt-duration);
}

::view-transition-old(root) {
    animation-name: vt-fade-out;
}

::view-transition-new(root) {
    animation-name: vt-fade-in;
}

@keyframes vt-fade-out {
    to { opacity: 0; filter: blur(4px); }
}

@keyframes vt-fade-in {
    from { opacity: 0; filter: blur(4px); }
}

.shelf-book,
.cover-card,
.book-item {
    view-transition-name: auto;
}

@media (prefers-reduced-motion: reduce) {
    @view-transition {
        navigation: none;
    }
    ::view-transition-old(root),
    ::view-transition-new(root) {
        animation: none !important;
    }
}

.reveal {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.55s var(--reveal-ease), transform 0.55s var(--reveal-ease);
}

.reveal.is-in {
    opacity: 1;
    transform: none;
}

.reveal-stagger > * {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.45s var(--reveal-ease), transform 0.45s var(--reveal-ease);
}

.reveal-stagger.is-in > *:nth-child(1) { transition-delay: 0.02s; }
.reveal-stagger.is-in > *:nth-child(2) { transition-delay: 0.05s; }
.reveal-stagger.is-in > *:nth-child(3) { transition-delay: 0.08s; }
.reveal-stagger.is-in > *:nth-child(4) { transition-delay: 0.11s; }
.reveal-stagger.is-in > *:nth-child(5) { transition-delay: 0.14s; }
.reveal-stagger.is-in > *:nth-child(6) { transition-delay: 0.17s; }
.reveal-stagger.is-in > *:nth-child(7) { transition-delay: 0.2s; }
.reveal-stagger.is-in > *:nth-child(8) { transition-delay: 0.23s; }
.reveal-stagger.is-in > *:nth-child(n+9) { transition-delay: 0.26s; }

.reveal-stagger.is-in > * {
    opacity: 1;
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    .reveal,
    .reveal-stagger > * {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }
}

.surname-toolbar {
    position: relative;
    z-index: 1;
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.surname-filter {
    flex: 1;
    min-width: 0;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--line);
    background: var(--xuan);
    color: var(--ink);
    font: inherit;
}

.surname-filter:focus {
    border-color: var(--cinnabar);
    outline: none;
}

.surname-chip.is-dimmed {
    opacity: 0.22;
    pointer-events: none;
}

.surname-chip.is-match {
    border-color: var(--cinnabar);
    background: var(--seal);
    color: var(--cinnabar);
}

.rail-shell {
    position: relative;
    z-index: 1;
}

.rail-shell::before,
.rail-shell::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 12px;
    width: 28px;
    z-index: 2;
    pointer-events: none;
}

.rail-shell::before {
    left: 0;
    background: linear-gradient(90deg, var(--panel), transparent);
}

.rail-shell::after {
    right: 0;
    background: linear-gradient(270deg, var(--panel), transparent);
}

.rail-controls {
    position: absolute;
    inset: 40% 0 auto;
    z-index: 3;
    display: flex;
    justify-content: space-between;
    pointer-events: none;
    padding: 0 2px;
}

.rail-btn {
    pointer-events: auto;
    width: 36px;
    height: 36px;
    border: 1px solid var(--line-deep);
    background: color-mix(in srgb, var(--panel) 88%, white);
    color: var(--chenxiang);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    backdrop-filter: blur(6px);
    transition: background-color 0.2s var(--reveal-ease), color 0.2s var(--reveal-ease);
}

.rail-btn:hover {
    background: var(--chenxiang);
    color: #fffaf3;
}

.rail-btn:disabled {
    opacity: 0.35;
    cursor: default;
}

.shelf-rail,
.cover-rail {
    scroll-behavior: smooth;
    scroll-padding-inline: 8px;
    scrollbar-width: thin;
}

.shelf-book:hover .shelf-book__cover,
.cover-card:hover .cover-card__frame {
    transform: translateY(-8px);
}

.rail-btn {
    border-radius: 999px;
    border-color: rgba(140, 112, 84, 0.28);
    box-shadow: 0 4px 14px rgba(70, 45, 25, 0.1);
}

.cmdk-panel {
    border-radius: 16px;
    overflow: hidden;
}

.cmdk-panel form {
    border-radius: 12px;
}

.view-toggle {
    border-radius: 999px;
    overflow: hidden;
}

.view-toggle button {
    border-radius: 0;
}

.surname-filter {
    border-radius: 999px;
    height: 38px;
    padding: 0 14px;
}

.skeleton-card {
    border-radius: 8px;
}

.book-list {
    container-type: inline-size;
    container-name: booklist;
}

@container booklist (max-width: 520px) {
    .book-item {
        grid-template-columns: 72px minmax(0, 1fr);
    }
}

.book-list-toolbar {
    position: relative;
    z-index: 1;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
}

.view-toggle {
    display: inline-flex;
    border: 1px solid var(--line);
    background: var(--xuan);
}

.view-toggle button {
    min-height: 36px;
    min-width: 44px;
    padding: 0 12px;
    border: 0;
    background: transparent;
    color: var(--ink-soft);
    cursor: pointer;
    font: inherit;
    font-family: var(--font-display);
    font-size: 0.82rem;
}

.view-toggle button.is-active {
    background: var(--chenxiang);
    color: #fffaf3;
}

.book-list.is-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}

.book-list.is-grid .book-item {
    grid-template-columns: 1fr;
    text-align: center;
}

.book-list.is-grid .book-item img {
    width: 100% !important;
    height: 100% !important;
    margin: 0 auto;
    object-fit: contain;
}

.book-list.is-grid .book-info p,
.book-list.is-grid .book-meta {
    display: none;
}

.book-item {
    content-visibility: auto;
    contain-intrinsic-size: 144px;
    transition: border-color 0.2s ease, transform 0.25s var(--reveal-ease);
}

.book-item:hover {
    transform: translateY(-2px);
}

.volume-list {
    container-type: inline-size;
}

.volume-item .volume-number::after {
    content: "阅读";
    position: absolute;
    right: 10px;
    bottom: 8px;
    font-size: 0.68rem;
    letter-spacing: 0;
    opacity: 0;
    color: inherit;
    transition: opacity 0.15s ease;
}

.volume-item .volume-number {
    position: relative;
    overflow: hidden;
}

.volume-item .volume-number:hover::after,
.volume-item .volume-number:focus-visible::after {
    opacity: 0.75;
}

.cmdk-hint {
    display: inline-flex;
    margin: 0;
    padding: 2px 6px;
    border: 1px solid color-mix(in srgb, #fff 35%, transparent);
    border-radius: 4px;
    font-size: 0.7rem;
    opacity: 0.95;
    font-family: ui-monospace, Consolas, monospace;
}

@media (min-width: 0) {
    .cmdk-hint { display: inline-flex; }
}

.cmdk-backdrop {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: color-mix(in srgb, var(--ink) 45%, transparent);
    backdrop-filter: blur(4px);
    display: grid;
    place-items: start center;
    padding: 12vh 16px 16px;
}

.cmdk-backdrop[hidden] { display: none !important; }

.cmdk-panel {
    width: min(640px, 100%);
    background: var(--panel);
    border: 1px solid var(--line-deep);
    box-shadow: 0 16px 48px rgba(42, 33, 24, 0.28);
    padding: 8px;
}

.cmdk-panel form {
    display: flex;
    gap: 0;
    border: 1px solid var(--line);
    background: var(--xuan);
}

.cmdk-panel select,
.cmdk-panel input {
    border: 0;
    background: transparent;
    font: inherit;
    color: var(--ink);
    height: 48px;
    padding: 0 12px;
}

.cmdk-panel select {
    border-right: 1px solid var(--line);
    min-width: 88px;
}

.cmdk-panel input { flex: 1; min-width: 0; }

.cmdk-panel button[type="submit"] {
    border: 0;
    background: var(--cinnabar);
    color: #fff;
    padding: 0 18px;
    font-family: var(--font-display);
    letter-spacing: 0.1em;
    cursor: pointer;
}

.cmdk-tips {
    margin: 10px 8px 4px;
    font-size: 0.8rem;
    color: var(--muted);
}

.family-list-container:not([hidden]) {
    animation: panel-in 0.35s var(--reveal-ease) both;
}

@keyframes panel-in {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
    .family-list-container:not([hidden]) { animation: none; }
}

@supports (animation-timeline: view()) {
    .shelf-section.reveal,
    .browse-section.reveal {
        animation: scroll-fade linear both;
        animation-timeline: view();
        animation-range: entry 0% cover 28%;
    }

    @keyframes scroll-fade {
        from { opacity: 0.35; transform: translateY(10px); }
        to { opacity: 1; transform: none; }
    }

    @media (prefers-reduced-motion: reduce) {
        .shelf-section.reveal,
        .browse-section.reveal {
            animation: none;
        }
    }
}

.skeleton-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(88px, 1fr));
    gap: 12px;
}

.skeleton-card {
    height: 96px;
    background: linear-gradient(90deg, var(--xuan) 25%, color-mix(in srgb, var(--xuan) 60%, white) 50%, var(--xuan) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.2s infinite linear;
    border: 1px solid var(--line);
}

@keyframes shimmer {
    to { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
    .skeleton-card { animation: none; }
}