:root {
    --library-bg: oklch(97.4% 0.004 85);
    --library-surface: oklch(100% 0 0);
    --library-ink: oklch(20% 0.008 55);
    --library-muted: oklch(48% 0.012 65);
    --library-border: oklch(87% 0.008 85);
    --library-accent: oklch(52% 0.17 35);
    --library-accent-soft: oklch(94% 0.035 38);
    --library-amber: oklch(67% 0.15 63);
    --library-teal: oklch(50% 0.1 183);
    --library-blue: oklch(48% 0.13 255);
    --library-radius-sm: 4px;
    --library-radius-md: 8px;
}

body.library-body {
    min-height: 100vh;
    background: var(--library-bg);
    color: var(--library-ink);
}

.skip-link {
    position: fixed;
    z-index: 1000;
    top: 8px;
    left: 8px;
    padding: 10px 14px;
    background: var(--library-ink);
    color: white;
    transform: translateY(-160%);
}

.skip-link:focus {
    transform: translateY(0);
}

.library-body .xia-nav-sites {
    scrollbar-width: none;
}

.library-body .xia-nav-sites::-webkit-scrollbar {
    display: none;
}

.library-shell {
    width: min(1160px, calc(100% - 40px));
    margin: 0 auto;
}

.library-hero {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
    gap: 64px;
    align-items: end;
    padding: 118px 0 64px;
    border-bottom: 1px solid var(--library-border);
}

.library-kicker,
.detail-kicker {
    display: block;
    margin-bottom: 16px;
    color: var(--library-accent);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.library-hero h1,
.detail-title,
.series-title {
    font-family: var(--font-serif);
    letter-spacing: -0.022em;
    text-wrap: balance;
}

.library-hero h1 {
    max-width: 7em;
    font-size: clamp(3.2rem, 7vw, 6.4rem);
    line-height: 0.98;
}

.library-intro {
    max-width: 38rem;
    padding-bottom: 8px;
}

.library-intro p {
    color: var(--library-muted);
    font-size: 1.08rem;
    line-height: 1.85;
    text-wrap: pretty;
}

.library-primary-action {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    margin-top: 24px;
    padding: 0 18px;
    border-radius: var(--library-radius-md);
    background: var(--library-ink);
    color: white;
    font-weight: 700;
    text-decoration: none;
    transition: transform 160ms cubic-bezier(0.16, 1, 0.3, 1);
}

.library-version {
    display: inline-block;
    margin-top: 22px;
    color: var(--library-muted);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-variant-numeric: tabular-nums;
}

.guided-section {
    display: grid;
    grid-template-columns: minmax(220px, 0.68fr) minmax(0, 1.52fr);
    gap: 56px;
    padding: 66px 0 70px;
    border-bottom: 1px solid var(--library-border);
}

.guided-heading h2 {
    max-width: 8.5em;
    font-family: var(--font-serif);
    font-size: clamp(1.9rem, 3.8vw, 3rem);
    line-height: 1.18;
    letter-spacing: -0.022em;
    text-wrap: balance;
}

.guided-list {
    border-top: 1px solid var(--library-border);
}

.guided-start {
    min-height: 148px;
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) 24px;
    gap: 18px;
    align-items: center;
    padding: 24px 2px;
    border-bottom: 1px solid var(--library-border);
    color: inherit;
    text-decoration: none;
    transition-property: transform, opacity;
    transition-duration: 180ms;
    transition-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

.guided-number {
    align-self: start;
    padding-top: 4px;
    color: var(--library-accent);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.guided-copy small,
.guided-copy strong,
.guided-copy p {
    display: block;
}

.guided-copy small {
    color: var(--library-accent);
    font-size: 0.75rem;
    font-weight: 800;
}

.guided-copy strong {
    margin-top: 7px;
    font-family: var(--font-serif);
    font-size: 1.35rem;
    line-height: 1.4;
}

.guided-copy p {
    margin-top: 7px;
    color: var(--library-muted);
    font-size: 0.9rem;
    line-height: 1.65;
}

.guided-arrow {
    color: var(--library-accent);
    font-size: 1.2rem;
}

.library-controls {
    position: sticky;
    z-index: 5;
    top: 62px;
    display: grid;
    grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
    gap: 28px;
    padding: 22px 0;
    background: color-mix(in oklch, var(--library-bg) 94%, transparent);
    border-bottom: 1px solid var(--library-border);
}

.library-search {
    position: relative;
}

.library-search input {
    width: 100%;
    min-height: 48px;
    padding: 0 44px 0 16px;
    border: 1px solid var(--library-border);
    border-radius: var(--library-radius-md);
    background: var(--library-surface);
    color: var(--library-ink);
    font: inherit;
}

.library-search input:focus-visible,
.filter-button:focus-visible,
.asset-link:focus-visible,
.detail-action:focus-visible {
    outline: 3px solid color-mix(in oklch, var(--library-accent) 32%, transparent);
    outline-offset: 2px;
}

.search-clear {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 40px;
    height: 40px;
    border: 0;
    background: transparent;
    color: var(--library-muted);
    font-size: 1.2rem;
    cursor: pointer;
}

.filter-groups {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
}

.filter-button {
    min-height: 40px;
    padding: 0 13px;
    border: 1px solid var(--library-border);
    border-radius: var(--library-radius-md);
    background: var(--library-surface);
    color: var(--library-muted);
    font: inherit;
    font-size: 0.84rem;
    cursor: pointer;
    transition-property: transform, color, background-color, border-color;
    transition-duration: 160ms;
    transition-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

.filter-button:active,
.asset-link:active,
.detail-action:active {
    transform: scale(0.97);
}

.filter-button[aria-pressed="true"] {
    border-color: var(--library-ink);
    background: var(--library-ink);
    color: white;
}

.library-section {
    padding: 52px 0 72px;
}

.library-section-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 24px;
}

.library-section-heading h2 {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    letter-spacing: -0.012em;
}

.result-count {
    color: var(--library-muted);
    font-size: 0.84rem;
    font-variant-numeric: tabular-nums;
}

.series-strip {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    overflow: hidden;
    margin-bottom: 56px;
    background: var(--library-border);
    border: 1px solid var(--library-border);
    border-radius: var(--library-radius-md);
}

.series-link {
    min-height: 210px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 30px;
    background: var(--library-surface);
    color: inherit;
    text-decoration: none;
}

.series-link:first-child {
    background: var(--library-ink);
    color: white;
}

.series-index {
    color: var(--library-accent);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.series-link:first-child .series-index,
.series-link:first-child p {
    color: color-mix(in oklch, white 72%, transparent);
}

.series-link h3 {
    margin-top: 34px;
    font-family: var(--font-serif);
    font-size: clamp(1.65rem, 3vw, 2.4rem);
    letter-spacing: -0.012em;
}

.series-link p {
    max-width: 32rem;
    margin-top: 10px;
    color: var(--library-muted);
    line-height: 1.7;
}

.asset-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 34px 22px;
}

.asset-card[hidden],
.library-empty[hidden] {
    display: none;
}

.asset-link {
    display: block;
    color: inherit;
    text-decoration: none;
    transition: transform 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.asset-media {
    position: relative;
    aspect-ratio: 2 / 3;
    overflow: hidden;
    border-radius: var(--library-radius-md);
    background: oklch(91% 0.008 85);
    outline: 1px solid rgba(0, 0, 0, 0.08);
    outline-offset: -1px;
}

.asset-media img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    transition: transform 320ms cubic-bezier(0.16, 1, 0.3, 1);
}

.asset-status {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 6px 8px;
    border-radius: var(--library-radius-sm);
    background: rgba(23, 23, 23, 0.88);
    color: white;
    font-size: 0.68rem;
    font-weight: 700;
}

.asset-meta {
    display: flex;
    gap: 7px;
    margin-top: 15px;
    color: var(--library-accent);
    font-size: 0.72rem;
    font-weight: 800;
}

.asset-card h3 {
    margin-top: 8px;
    font-family: var(--font-serif);
    font-size: 1.18rem;
    line-height: 1.45;
    letter-spacing: 0;
    text-wrap: balance;
}

.asset-card p {
    display: -webkit-box;
    overflow: hidden;
    margin-top: 8px;
    color: var(--library-muted);
    font-size: 0.9rem;
    line-height: 1.65;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.library-empty {
    padding: 72px 0;
    border-top: 1px solid var(--library-border);
    color: var(--library-muted);
}

.detail-shell {
    width: min(1040px, calc(100% - 40px));
    margin: 0 auto;
    padding: 108px 0 90px;
}

.detail-back {
    display: inline-flex;
    min-height: 40px;
    align-items: center;
    color: var(--library-muted);
    text-decoration: none;
}

.detail-header {
    max-width: 800px;
    margin-top: 48px;
}

.detail-title {
    font-size: clamp(2.5rem, 6vw, 5.4rem);
    line-height: 1.08;
}

.detail-summary {
    max-width: 42rem;
    margin-top: 24px;
    color: var(--library-muted);
    font-size: 1.08rem;
    line-height: 1.85;
}

.archive-notice {
    max-width: 42rem;
    margin-top: 24px;
    padding: 14px 16px;
    background: oklch(94% 0.06 75);
    color: oklch(38% 0.08 60);
}

.detail-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
    gap: 48px;
    align-items: start;
    margin-top: 54px;
}

.detail-figure {
    margin: 0;
}

.detail-figure img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--library-radius-md);
    box-shadow: 0 18px 50px rgba(23, 23, 23, 0.14);
}

.detail-copy {
    position: sticky;
    top: 94px;
}

.detail-copy h2 {
    font-family: var(--font-serif);
    font-size: 1.55rem;
}

.detail-copy p {
    margin-top: 16px;
    color: var(--library-muted);
    line-height: 1.95;
}

.detail-byline {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid var(--library-border);
    color: var(--library-muted);
    font-size: 0.78rem;
}

.detail-action {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    margin-top: 28px;
    padding: 0 17px;
    border-radius: var(--library-radius-md);
    background: var(--library-ink);
    color: white;
    font-weight: 700;
    text-decoration: none;
    transition: transform 160ms cubic-bezier(0.16, 1, 0.3, 1);
}

.series-page-header {
    max-width: 820px;
    margin-top: 48px;
}

.series-title {
    font-size: clamp(2.8rem, 7vw, 6.2rem);
    line-height: 1;
}

.series-summary {
    max-width: 38rem;
    margin-top: 24px;
    color: var(--library-muted);
    font-size: 1.08rem;
    line-height: 1.85;
}

.series-list {
    margin-top: 64px;
    border-top: 1px solid var(--library-border);
}

.series-item {
    display: grid;
    grid-template-columns: 70px 180px minmax(0, 1fr) 28px;
    gap: 24px;
    align-items: center;
    padding: 24px 0;
    border-bottom: 1px solid var(--library-border);
    color: inherit;
    text-decoration: none;
}

.series-order {
    color: var(--library-accent);
    font-family: var(--font-mono);
    font-size: 0.82rem;
}

.series-thumb {
    aspect-ratio: 2 / 3;
    overflow: hidden;
    border-radius: var(--library-radius-sm);
}

.series-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.series-item h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
}

.series-item p {
    margin-top: 8px;
    color: var(--library-muted);
    line-height: 1.7;
}

@media (hover: hover) {
    .library-primary-action:hover {
        color: white;
        text-decoration: none;
        transform: translateY(-2px);
    }

    .guided-start:hover {
        color: inherit;
        text-decoration: none;
        opacity: 0.74;
        transform: translateX(5px);
    }

    .asset-link:hover,
    .series-item:hover {
        transform: translateY(-3px);
    }

    .asset-link:hover img {
        transform: scale(1.025);
    }

    .detail-back:hover,
    .series-link:hover {
        color: var(--library-accent);
    }
}

@media (max-width: 860px) {
    .library-hero,
    .detail-layout,
    .guided-section {
        grid-template-columns: 1fr;
    }

    .library-hero {
        gap: 30px;
        padding-top: 94px;
    }

    .library-controls {
        position: static;
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .guided-section {
        gap: 28px;
    }

    .filter-groups {
        justify-content: flex-start;
    }

    .asset-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .detail-copy {
        position: static;
    }
}

@media (max-width: 580px) {
    .library-shell,
    .detail-shell {
        width: min(100% - 28px, 1160px);
    }

    .library-body .xia-nav-sites {
        max-width: 100%;
        overflow-x: auto;
        overscroll-behavior-inline: contain;
    }

    .library-hero h1 {
        font-size: 3.6rem;
    }

    .library-hero {
        padding-bottom: 48px;
    }

    .library-intro p {
        font-size: 1rem;
    }

    .guided-section {
        padding: 48px 0 52px;
    }

    .guided-heading h2 {
        max-width: 11em;
    }

    .guided-start {
        min-height: 0;
        grid-template-columns: 34px minmax(0, 1fr) 20px;
        gap: 12px;
        padding: 21px 0;
    }

    .guided-copy strong {
        font-size: 1.12rem;
    }

    .series-strip,
    .asset-grid {
        grid-template-columns: 1fr;
    }

    .series-link {
        min-height: 180px;
        padding: 24px;
    }

    .asset-grid {
        gap: 28px;
    }

    .asset-link {
        display: grid;
        grid-template-columns: 112px minmax(0, 1fr);
        gap: 16px;
        align-items: start;
    }

    .asset-media {
        aspect-ratio: 2 / 3;
    }

    .asset-copy {
        min-width: 0;
    }

    .asset-meta {
        margin-top: 0;
    }

    .asset-card h3 {
        font-size: 1.05rem;
    }

    .asset-card p {
        font-size: 0.84rem;
    }

    .detail-shell {
        padding-top: 88px;
    }

    .detail-header {
        margin-top: 30px;
    }

    .detail-title {
        font-size: 2.65rem;
    }

    .series-item {
        grid-template-columns: 38px 84px minmax(0, 1fr);
        gap: 14px;
    }

    .series-item > span:last-child {
        display: none;
    }

    .series-item h2 {
        font-size: 1.05rem;
    }

    .series-item p {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .filter-button,
    .asset-link,
    .asset-media img,
    .detail-action,
    .guided-start,
    .library-primary-action {
        transition: none;
    }
}