:root {
    color-scheme: light;
    --background: #f8f7f5;
    --surface: #ffffff;
    --surface-subtle: #f1efec;
    --text: #292524;
    --muted: #6f6965;
    --border: #dedad5;
    --border-strong: #c8c2bc;
    --accent: #aa2e45;
    --accent-hover: #8b2035;
    --accent-soft: #f4e6e9;
    --code-background: #f2f0ed;
    --code-gutter: #e7e3df;
    --shadow: 0 1rem 3rem rgb(62 43 38 / 12%);
    --syntax-comment: #78716c;
    --syntax-keyword: #aa2e45;
    --syntax-builtin: #175f6c;
    --syntax-string: #367249;
    --syntax-number: #9a4c13;
    --syntax-function: #65469b;
    --syntax-operator: #b03951;
    --diagram-filter: none;
    --diagram-blend-mode: normal;
    font-synthesis: none;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --background: #0b0a0a;
    --surface: #131212;
    --surface-subtle: #1c1a19;
    --text: #eeeae6;
    --muted: #b5ada7;
    --border: #2c2927;
    --border-strong: #45403d;
    --accent: #cd586f;
    --accent-hover: #dd7488;
    --accent-soft: #250e17;
    --code-background: #181616;
    --code-gutter: #211e1d;
    --shadow: 0 1rem 3rem rgb(0 0 0 / 35%);
    --syntax-comment: #a8a29e;
    --syntax-keyword: #d96b80;
    --syntax-builtin: #78c6d3;
    --syntax-string: #8bc99a;
    --syntax-number: #e8a56d;
    --syntax-function: #c8a9f2;
    --syntax-operator: #cd586f;
    --diagram-filter: invert(100%) brightness(90%);
    --diagram-blend-mode: screen;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --background: #0b0a0a;
        --surface: #131212;
        --surface-subtle: #1c1a19;
        --text: #eeeae6;
        --muted: #b5ada7;
        --border: #2c2927;
        --border-strong: #45403d;
        --accent: #cd586f;
        --accent-hover: #dd7488;
        --accent-soft: #250e17;
        --code-background: #181616;
        --code-gutter: #211e1d;
        --shadow: 0 1rem 3rem rgb(0 0 0 / 35%);
        --syntax-comment: #a8a29e;
        --syntax-keyword: #d96b80;
        --syntax-builtin: #78c6d3;
        --syntax-string: #8bc99a;
        --syntax-number: #e8a56d;
        --syntax-function: #c8a9f2;
        --syntax-operator: #cd586f;
        --diagram-filter: invert(100%) brightness(90%);
        --diagram-blend-mode: screen;
    }
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-width: 20rem;
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
    font-size: 16px;
    line-height: 1.7;
    text-rendering: optimizeLegibility;
}

button,
input {
    font: inherit;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    color: var(--accent-hover);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
}

.skip-link {
    position: fixed;
    z-index: 100;
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.55rem 0.8rem;
    border-radius: 0.35rem;
    background: var(--surface);
    box-shadow: var(--shadow);
    transform: translateY(-200%);
}

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

.site-shell {
    display: grid;
    min-height: 100vh;
    grid-template-columns: minmax(15rem, 18rem) minmax(0, 1fr) 15rem;
}

.site-sidebar {
    position: sticky;
    top: 0;
    display: flex;
    height: 100vh;
    min-width: 0;
    flex-direction: column;
    border-right: 1px solid var(--border);
    background: var(--surface);
}

.site-sidebar-header {
    display: flex;
    flex: none;
    align-items: flex-start;
    justify-content: space-between;
    padding: 1.4rem 1.25rem 1.1rem;
    border-bottom: 1px solid var(--border);
}

.site-brand {
    display: block;
    color: var(--text);
    line-height: 1.25;
    text-decoration: none;
}

.site-brand:hover {
    color: var(--text);
}

.site-brand span {
    display: block;
    margin-bottom: 0.18rem;
    color: var(--accent);
    font-weight: 750;
}

.site-brand strong {
    font-size: 1.02rem;
    font-weight: 720;
}

.sidebar-close {
    display: none;
}

.book-nav {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding: 0.9rem 0.75rem 1.5rem;
    overscroll-behavior: contain;
    scrollbar-width: thin;
}

.book-nav ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

.book-nav a {
    display: block;
    padding: 0.42rem 0.55rem;
    border-radius: 0.35rem;
    color: var(--muted);
    font-size: 0.875rem;
    line-height: 1.45;
    text-decoration: none;
}

.book-nav a:hover {
    background: var(--surface-subtle);
    color: var(--text);
}

.book-nav a[aria-current="page"] {
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 700;
}

.book-nav-home {
    margin-bottom: 0.6rem;
    font-weight: 700;
}

.book-nav-chapter > a {
    margin-top: 0.7rem;
    color: var(--text);
    font-weight: 700;
}

.book-nav-sections {
    margin: 0.15rem 0 0 0.65rem !important;
    padding-left: 0.55rem !important;
    border-left: 1px solid var(--border);
}

.site-sidebar-footer {
    display: flex;
    flex: none;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 1.25rem;
    border-top: 1px solid var(--border);
    font-size: 0.82rem;
}

.site-sidebar-footer a {
    color: var(--muted);
    text-decoration: none;
}

.site-sidebar-footer button,
.header-button {
    padding: 0.34rem 0.55rem;
    border: 1px solid var(--border);
    border-radius: 0.35rem;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
}

.site-sidebar-footer button:hover,
.header-button:hover {
    border-color: var(--border-strong);
    background: var(--surface-subtle);
    color: var(--text);
}

.theme-toggle {
    display: grid;
    width: 2rem;
    height: 2rem;
    flex: none;
    padding: 0;
    place-items: center;
}

.theme-icon {
    display: none;
    width: 1rem;
    height: 1rem;
}

.theme-toggle[data-next-theme="dark"] .theme-icon-moon,
.theme-toggle[data-next-theme="light"] .theme-icon-sun {
    display: block;
}

.site-main {
    min-width: 0;
}

.content-column {
    width: min(100%, 58rem);
    margin: 0 auto;
    padding: 3.5rem 3rem 2rem;
}

.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1.5rem;
    color: var(--muted);
    font-size: 0.8rem;
    line-height: 1.5;
}

.breadcrumbs a {
    color: var(--muted);
    text-decoration: none;
}

.breadcrumbs a:hover {
    color: var(--accent);
}

.breadcrumb-separator {
    color: var(--border-strong);
    user-select: none;
}

.doc-content {
    min-width: 0;
}

.doc-content h1,
.doc-content h2,
.doc-content h3,
.doc-content h4 {
    color: var(--text);
    font-weight: 720;
    line-height: 1.32;
    scroll-margin-top: 2rem;
    text-wrap: balance;
}

.doc-content h1 {
    max-width: 19em;
    margin: 0 0 2rem;
    font-size: clamp(2rem, 4vw, 2.65rem);
    letter-spacing: -0.035em;
}

.doc-content h2 {
    margin: 3rem 0 1.25rem;
    font-size: clamp(1.45rem, 2.5vw, 1.75rem);
    letter-spacing: -0.018em;
}

.doc-content h3 {
    margin: 2.4rem 0 1rem;
    font-size: 1.28rem;
}

.doc-content h4 {
    margin: 2.2rem 0 0.8rem;
    font-size: 1.08rem;
}

.heading-anchor {
    margin-left: 0.45rem;
    color: var(--border-strong);
    font-weight: 500;
    opacity: 0;
    text-decoration: none;
}

.doc-content :is(h2, h3):hover .heading-anchor,
.heading-anchor:focus-visible {
    opacity: 1;
}

.doc-content p,
.doc-content li {
    overflow-wrap: break-word;
}

.doc-content p {
    margin: 1.15rem 0;
}

.doc-content ul,
.doc-content ol {
    padding-left: 1.45rem;
}

.doc-content li + li {
    margin-top: 0.32rem;
}

.doc-content blockquote {
    margin: 1.6rem 0;
    padding: 0.25rem 1rem;
    border-left: 3px solid var(--accent);
    background: var(--surface-subtle);
    color: var(--muted);
}

.doc-content blockquote > :first-child {
    margin-top: 0.55rem;
}

.doc-content blockquote > :last-child {
    margin-bottom: 0.55rem;
}

code,
pre {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

:not(pre) > code {
    padding: 0.13em 0.34em;
    border: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
    border-radius: 0.28rem;
    background: var(--code-background);
    font-size: 0.88em;
}

pre,
div.sourceCode {
    max-width: 100%;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    background: var(--code-background);
}

pre {
    overflow: auto;
    margin: 1.4rem 0;
    padding: 1rem 1.15rem;
    font-size: 0.82rem;
    line-height: 1.62;
    tab-size: 4;
}

div.sourceCode {
    overflow: hidden;
    margin: 1.4rem 0;
}

div.sourceCode pre {
    margin: 0;
    border: 0;
    border-radius: 0;
}

pre code {
    padding: 0;
    border: 0;
    background: transparent;
    font-size: inherit;
}

code span.al,
code span.er {
    color: #d13a42;
    font-weight: 700;
}

code span.an,
code span.co,
code span.cv,
code span.do,
code span.in,
code span.wa {
    color: var(--syntax-comment);
    font-style: italic;
}

code span.bu,
code span.dt,
code span.ot {
    color: var(--syntax-builtin);
}

code span.bn,
code span.dv,
code span.fl {
    color: var(--syntax-number);
}

code span.cf,
code span.ex,
code span.im,
code span.kw {
    color: var(--syntax-keyword);
    font-weight: 650;
}

code span.ch,
code span.cn,
code span.sc,
code span.ss,
code span.st,
code span.vs {
    color: var(--syntax-string);
}

code span.va {
    color: var(--syntax-function);
}

code span.fu {
    color: var(--syntax-function);
    font-weight: 650;
}

code span.at,
code span.pp {
    color: var(--syntax-number);
}

code span.op {
    color: var(--syntax-operator);
}

.doc-content table {
    display: block;
    width: max-content;
    max-width: 100%;
    margin: 1.6rem 0;
    overflow-x: auto;
    border-spacing: 0;
    border-collapse: separate;
    border: 1px solid var(--border);
    border-radius: 0.45rem;
    font-size: 0.9rem;
}

.doc-content th,
.doc-content td {
    padding: 0.62rem 0.75rem;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

.doc-content th:last-child,
.doc-content td:last-child {
    border-right: 0;
}

.doc-content tr:last-child td {
    border-bottom: 0;
}

.doc-content th {
    background: var(--surface-subtle);
    font-weight: 700;
}

.doc-content img,
.doc-content svg {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 1.7rem auto;
}

.doc-content img[src$=".svg"] {
    padding: 0.8rem;
    border: 1px solid var(--border);
    border-radius: 0.45rem;
    background: #ffffff;
    filter: var(--diagram-filter);
    mix-blend-mode: var(--diagram-blend-mode);
}

.doc-content figure {
    margin: 1.7rem 0;
}

.doc-content figure img {
    margin-bottom: 0.65rem;
}

.doc-content figcaption {
    color: var(--muted);
    font-size: 0.82rem;
    text-align: center;
}

.doc-content .math {
    overflow-x: auto;
}

.source-link {
    cursor: zoom-in;
}

.page-pagination {
    display: grid;
    gap: 1rem;
    margin-top: 5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.pagination-link {
    display: flex;
    min-width: 0;
    flex-direction: column;
    padding: 0.85rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.45rem;
    color: var(--text);
    text-decoration: none;
}

.pagination-link:hover {
    border-color: var(--accent);
    background: var(--surface);
    color: var(--text);
}

.pagination-link span {
    margin-bottom: 0.22rem;
    color: var(--muted);
    font-size: 0.75rem;
}

.pagination-link strong {
    overflow: hidden;
    font-size: 0.9rem;
    font-weight: 650;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pagination-next {
    align-items: flex-end;
    text-align: right;
}

.page-toc {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    padding: 3.8rem 1.2rem 2rem 0.4rem;
    scrollbar-width: thin;
}

.page-toc-title {
    margin: 0 0 0.55rem;
    color: var(--text);
    font-size: 0.76rem;
    font-weight: 750;
}

.page-toc ol {
    margin: 0;
    padding: 0;
    border-left: 1px solid var(--border);
    list-style: none;
}

.page-toc li {
    margin: 0;
}

.page-toc a {
    display: block;
    margin-left: -1px;
    padding: 0.3rem 0.35rem 0.3rem 0.7rem;
    border-left: 1px solid transparent;
    color: var(--muted);
    font-size: 0.76rem;
    line-height: 1.45;
    text-decoration: none;
}

.page-toc a:hover,
.page-toc a[aria-current="true"] {
    border-left-color: var(--accent);
    color: var(--accent);
}

.page-toc .toc-level-3 a {
    padding-left: 1.25rem;
}

.mobile-header,
.nav-backdrop {
    display: none;
}

.source-viewer {
    width: min(96vw, 100rem);
    height: min(90vh, 64rem);
    max-width: none;
    max-height: none;
    padding: 0;
    overflow: hidden;
    border: 1px solid var(--border-strong);
    border-radius: 0.65rem;
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow);
}

.source-viewer[open] {
    display: flex;
    flex-direction: column;
}

.source-viewer::backdrop {
    background: rgb(20 13 13 / 62%);
    backdrop-filter: blur(2px);
}

.source-viewer-header {
    display: flex;
    flex: none;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
    min-width: 0;
    padding: 0.72rem 0.9rem;
    border-bottom: 1px solid var(--border);
}

.source-viewer-heading,
.source-viewer-actions {
    display: flex;
    min-width: 0;
    gap: 0.65rem;
    align-items: center;
}

.source-viewer-heading strong {
    overflow: hidden;
    font-size: 0.9rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.source-viewer-kind {
    flex: none;
    padding: 0.12rem 0.42rem;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.68rem;
    font-weight: 750;
    letter-spacing: 0.04em;
}

.source-viewer-raw {
    flex: none;
    color: var(--muted);
    font-size: 0.78rem;
    text-decoration: none;
}

.source-viewer-actions button {
    display: grid;
    width: 2rem;
    height: 2rem;
    padding: 0;
    border: 0;
    border-radius: 0.35rem;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 1.35rem;
    place-items: center;
}

.source-viewer-actions button:hover {
    background: var(--surface-subtle);
    color: var(--text);
}

.source-viewer-body {
    flex: 1;
    min-height: 0;
    overflow: auto;
    overscroll-behavior: contain;
    background: var(--code-background);
}

.source-viewer-status {
    margin: 0;
    padding: 3rem 1.5rem;
    color: var(--muted);
    text-align: center;
}

.source-viewer-status[data-error] {
    color: var(--accent);
}

.source-viewer-content {
    min-width: max-content;
    min-height: 100%;
}

.source-viewer-content div.sourceCode,
.source-viewer-content pre {
    margin: 0;
    overflow: visible;
    border: 0;
    border-radius: 0;
}

.source-viewer-content pre.numberSource {
    min-height: 100%;
    padding: 0.8rem 0;
}

.source-viewer-content pre.numberSource code {
    display: block;
    counter-reset: source-line;
}

.source-viewer-content pre.numberSource code > span {
    display: inline;
    padding-right: 1.5rem;
    counter-increment: source-line;
}

.source-viewer-content pre.numberSource code > span > a:first-child::before {
    position: sticky;
    left: 0;
    display: inline-block;
    width: 4.4rem;
    margin-right: 1rem;
    padding-right: 0.8rem;
    border-right: 1px solid var(--border);
    background: var(--code-gutter);
    color: var(--muted);
    content: counter(source-line);
    text-align: right;
    text-decoration: none;
    user-select: none;
}

html.source-viewer-open {
    overflow: hidden;
}

@media (max-width: 1180px) {
    .site-shell {
        grid-template-columns: minmax(15rem, 17rem) minmax(0, 1fr);
    }

    .page-toc {
        display: none;
    }
}

@media (max-width: 800px) {
    .mobile-header {
        position: sticky;
        z-index: 30;
        top: 0;
        display: grid;
        min-height: 3.4rem;
        align-items: center;
        padding: 0.55rem 0.75rem;
        border-bottom: 1px solid var(--border);
        background: color-mix(in srgb, var(--surface) 94%, transparent);
        grid-template-columns: auto minmax(0, 1fr) auto;
        backdrop-filter: blur(10px);
    }

    .mobile-title {
        overflow: hidden;
        padding: 0 0.8rem;
        color: var(--text);
        font-size: 0.88rem;
        font-weight: 700;
        text-align: center;
        text-decoration: none;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .site-shell {
        display: block;
    }

    .site-sidebar {
        position: fixed;
        z-index: 50;
        top: 0;
        left: 0;
        width: min(90vw, 20rem);
        max-width: none;
        transform: translateX(-105%);
        transition: transform 180ms ease;
    }

    body.nav-open {
        overflow: hidden;
    }

    body.nav-open .site-sidebar {
        transform: translateX(0);
    }

    .sidebar-close {
        display: grid;
        width: 2rem;
        height: 2rem;
        padding: 0;
        border: 0;
        border-radius: 0.35rem;
        background: transparent;
        color: var(--muted);
        cursor: pointer;
        font-size: 1.35rem;
        place-items: center;
    }

    .nav-backdrop {
        position: fixed;
        z-index: 40;
        inset: 0;
        width: 100%;
        height: 100%;
        padding: 0;
        border: 0;
        background: rgb(20 13 13 / 55%);
        cursor: default;
    }

    body.nav-open .nav-backdrop {
        display: block;
    }

    .content-column {
        padding: 2.25rem 1.15rem 2rem;
    }

    .doc-content h1 {
        font-size: 2rem;
    }

    .doc-content h2 {
        margin-top: 2.5rem;
    }

    .page-pagination {
        grid-template-columns: 1fr;
    }

    .pagination-placeholder {
        display: none;
    }

    .source-viewer {
        width: calc(100vw - 0.75rem);
        height: calc(100dvh - 0.75rem);
        border-radius: 0.45rem;
    }

    .source-viewer-header {
        padding: 0.65rem 0.7rem;
    }

    .source-viewer-raw {
        display: none;
    }

    .source-viewer-content pre.numberSource code > span > a:first-child::before {
        width: 3.7rem;
        margin-right: 0.7rem;
        padding-right: 0.65rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .site-sidebar {
        transition: none;
    }
}

@media print {
    :root {
        color-scheme: light;
    }

    body {
        background: #ffffff;
        color: #000000;
    }

    .doc-content img[src$=".svg"] {
        filter: none;
        mix-blend-mode: normal;
    }

    .mobile-header,
    .site-sidebar,
    .page-toc,
    .breadcrumbs,
    .page-pagination,
    .source-viewer {
        display: none !important;
    }

    .site-shell {
        display: block;
    }

    .content-column {
        width: auto;
        max-width: none;
        padding: 0;
    }

    .doc-content a {
        color: inherit;
    }
}