@font-face {
    font-family: "JetBrains Mono";
    font-weight: 100 800;
    font-display: swap;
    src: url("fonts/JetBrainsMono-Variable.ttf") format("truetype");
}
@font-face {
    font-family: "JetBrains Mono";
    font-weight: 100 800;
    font-style: italic;
    font-display: swap;
    src: url("fonts/JetBrainsMono-Italic-Variable.ttf") format("truetype");
}
@font-face {
    font-family: "Aleo";
    font-weight: 100 900;
    font-display: swap;
    src: local("Aleo"), url("fonts/Aleo-VariableFont.ttf") format("truetype");
}
@font-face {
    font-family: "NewComputerModernMath";
    font-weight: normal;
    font-display: swap;
    src: url("fonts/NewCMMath-Regular.otf") format("opentype");
}

/* ============================================================
   Gaanim docs — design tokens
   ============================================================ */

:root {
    color-scheme: light;

    --bg: #ffffff;
    --bg-soft: #fafafa;
    --bg-muted: #f4f4f5;
    --bg-elevated: #ffffff;
    --bg-code: #fafafa;
    --border: #e5e5e7;
    --border-strong: #d4d4d8;

    --text: #18181b;
    --text-soft: #3f3f46;
    --text-muted: #6b6b73;

    /* Brand palette: docs/assets/brand/README.md (generated by tools/generate_brand.py). */
    --brand-ink: #14112e;
    --brand-paper: #f7f6ff;
    --brand-violet: #7c6cff;
    --brand-violet-deep: #5b4af0;
    --brand-haze: #cbc6ff;
    --brand-gold: #ffc933;

    /* Text-safe brand violet: 5.7:1 on white. */
    --primary: #5b4af0;
    --primary-strong: #4636d6;
    --primary-soft: #f1efff;
    --primary-ring: rgba(91, 74, 240, 0.25);
    --accent: #0891b2;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;

    --kind-method: #7c3aed;
    --kind-class: #0891b2;
    --kind-function: #d97706;
    --kind-property: #059669;
    --kind-constant: #db2777;
    --kind-factory: #4f46e5;

    /* Body text uses the reader's system face; headings share Aleo with the PDF. */
    --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-display: "Aleo", Georgia, "Times New Roman", serif;
    --font-code: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --font-math: "NewComputerModernMath", serif;

    /* Interface language: square frames that move one frame at a time
       (docs/assets/brand/README.md). */
    --font-label: var(--font-code);
    --frame-1: color-mix(in srgb, var(--primary) 45%, transparent);
    --frame-2: color-mix(in srgb, var(--primary) 20%, transparent);
    --frames: -3px 0 0 var(--frame-1), -6px 0 0 var(--frame-2);
    --frame-motion: 0.15s steps(3, end);
    --grid-line: color-mix(in srgb, var(--text) 7%, transparent);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.22);

    --header-h: 60px;
    --sidebar-w: 272px;
    --toc-w: 220px;
    --content-w: 820px;

    /* Aliases kept for inline styles in older content pages. */
    --bg-main: var(--bg);
    --bg-card: var(--bg-elevated);
    --text-main: var(--text);
    --code-border: var(--border);
    --code-border-strong: var(--border-strong);
    --accent-blue: var(--primary);
    --accent-violet: #7c3aed;
    --accent-cyan: #0891b2;
    --accent-gold: #d97706;
    --accent-emerald: #059669;
    --accent-purple: #7c3aed;
    --font-main: var(--font-sans);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --bg: #121212;
        --bg-soft: #171717;
        --bg-muted: #242424;
        --bg-elevated: #1b1b1b;
        --bg-code: #0e0e0e;
        --border: #292929;
        --border-strong: #3d3d3d;
        --text: #ededed;
        --text-soft: #d0d0d0;
        --text-muted: #a0a0a0;
        --primary: #a99fff;
        --primary-strong: #c9c3ff;
        --primary-soft: rgba(169, 159, 255, 0.12);
        --primary-ring: rgba(169, 159, 255, 0.35);
        --accent: #22d3ee;
        --success: #34d399;
        --warning: #fbbf24;
        --danger: #f87171;
        --kind-method: #c4b5fd;
        --kind-class: #67e8f9;
        --kind-function: #fcd34d;
        --kind-property: #6ee7b7;
        --kind-constant: #f9a8d4;
        --kind-factory: #a5b4fc;
        --shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
        --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.6);
        --accent-violet: #c4b5fd;
        --accent-cyan: #67e8f9;
        --accent-gold: #fcd34d;
        --accent-emerald: #6ee7b7;
    }
}
:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #121212;
    --bg-soft: #171717;
    --bg-muted: #242424;
    --bg-elevated: #1b1b1b;
    --bg-code: #0e0e0e;
    --border: #292929;
    --border-strong: #3d3d3d;
    --text: #ededed;
    --text-soft: #d0d0d0;
    --text-muted: #a0a0a0;
    --primary: #a99fff;
    --primary-strong: #c9c3ff;
    --primary-soft: rgba(169, 159, 255, 0.12);
    --primary-ring: rgba(169, 159, 255, 0.35);
    --accent: #22d3ee;
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;
    --kind-method: #c4b5fd;
    --kind-class: #67e8f9;
    --kind-function: #fcd34d;
    --kind-property: #6ee7b7;
    --kind-constant: #f9a8d4;
    --kind-factory: #a5b4fc;
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.6);
    --accent-violet: #c4b5fd;
    --accent-cyan: #67e8f9;
    --accent-gold: #fcd34d;
    --accent-emerald: #6ee7b7;
}

/* Typst syntax colors, remapped for dark backgrounds. */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) span[style*="color: #b60157"] { color: #f472b6 !important; }
    :root:not([data-theme="light"]) span[style*="color: #4b69c6"] { color: #93c5fd !important; }
    :root:not([data-theme="light"]) span[style*="color: #d73948"] { color: #fca5a5 !important; }
    :root:not([data-theme="light"]) span[style*="color: #198810"] { color: #6ee7b7 !important; }
    :root:not([data-theme="light"]) span[style*="color: #74747c"] { color: #8a8a8a !important; }
    :root:not([data-theme="light"]) span[style*="color: #8b41b1"] { color: #d8b4fe !important; }
    :root:not([data-theme="light"]) span[style*="color: #1d6c76"] { color: #67e8f9 !important; }
}
:root[data-theme="dark"] span[style*="color: #b60157"] { color: #f472b6 !important; }
:root[data-theme="dark"] span[style*="color: #4b69c6"] { color: #93c5fd !important; }
:root[data-theme="dark"] span[style*="color: #d73948"] { color: #fca5a5 !important; }
:root[data-theme="dark"] span[style*="color: #198810"] { color: #6ee7b7 !important; }
:root[data-theme="dark"] span[style*="color: #74747c"] { color: #8a8a8a !important; }
:root[data-theme="dark"] span[style*="color: #8b41b1"] { color: #d8b4fe !important; }
:root[data-theme="dark"] span[style*="color: #1d6c76"] { color: #67e8f9 !important; }

/* ============================================================
   Base
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
@view-transition { navigation: auto; }
::selection { background: var(--primary-ring); }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
    :root { --frame-motion: 0s; }
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-strong); text-decoration: underline; text-underline-offset: 3px; }

main p, main li { color: var(--text-soft); }
main p { margin: 0 0 1.05em; text-wrap: pretty; }
main strong { color: var(--text); }
main ul, main ol { padding-left: 1.4em; }
main li { margin: 0.25em 0; }
main li::marker { color: var(--text-muted); }
hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }

h1, h2, h3, h4 {
    position: relative;
    color: var(--text);
    font-family: var(--font-display);
    line-height: 1.25;
    letter-spacing: -0.02em;
    scroll-margin-top: calc(var(--header-h) + 16px);
}
h1 { font-size: clamp(1.9rem, 3.4vw, 2.5rem); font-weight: 800; margin: 0 0 0.4em; letter-spacing: -0.035em; }
h2 { font-size: 1.5rem; font-weight: 750; margin: 2.2em 0 0.6em; padding-top: 1.2em; border-top: 1px solid var(--border); }
h3 { font-size: 1.18rem; font-weight: 700; margin: 1.8em 0 0.5em; }
h4 { font-size: 1rem; font-weight: 700; margin: 1.4em 0 0.4em; color: var(--text-soft); }
main > h2:first-child, main > h1 + h2 { border-top: none; padding-top: 0; }
main h2::before, main.page-home > h3::before {
    content: "";
    display: inline-block;
    width: 0.4em;
    height: 0.4em;
    margin: 0 0.65em 0.14em 0.54em;
    vertical-align: middle;
    background: var(--primary);
    box-shadow: -0.27em 0 0 var(--frame-1), -0.54em 0 0 var(--frame-2);
}

.heading-anchor {
    margin-left: 0.4em;
    color: var(--text-muted);
    font-weight: 500;
    opacity: 0;
    text-decoration: none !important;
    transition: opacity 0.12s ease;
}
h1:hover .heading-anchor, h2:hover .heading-anchor, h3:hover .heading-anchor, h4:hover .heading-anchor { opacity: 1; }

/* Previous / next page at the end of each chapter */
.page-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin: 3em 0 1em;
}
.page-nav a {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 14px 16px;
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    color: inherit !important;
    text-decoration: none !important;
}
.page-nav a:hover { border-color: var(--primary); }
.page-nav-next { grid-column: 2; text-align: right; }
.page-nav-label { font-family: var(--font-label); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); }
.page-nav-title { font-weight: 650; color: var(--text); }
@media (max-width: 560px) {
    .page-nav { grid-template-columns: minmax(0, 1fr); }
    .page-nav-next { grid-column: 1; }
}

/* Tutorial callouts: "Idea clave" and "Punto de control" */
.lesson-box {
    margin: 1.4em 0;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-left: 3px solid var(--primary);
    background: var(--primary-soft);
}
.lesson-box-experimental { border-left-color: var(--warning); background: color-mix(in srgb, var(--warning) 8%, transparent); }
.lesson-box-experimental .lesson-box-title { color: var(--warning); }
.lesson-box > p:first-of-type { margin-top: 0; }
.lesson-box > p:last-child { margin-bottom: 0; }
.lesson-box-title {
    margin-bottom: 6px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--primary);
}

/* Inline and block code */
code, pre, .typ-raw { font-family: var(--font-code); }
/* Long identifiers and commands in running text wrap instead of widening the page on phones. */
:not(pre) > code { overflow-wrap: anywhere; }
:not(pre) > code {
    font-size: 0.86em;
    padding: 0.12em 0.38em;
    background: var(--bg-muted);
    border: 1px solid var(--border);
    color: var(--text);
    white-space: nowrap;
}
pre {
    font-size: 0.86rem;
    line-height: 1.6;
    margin: 1.2em 0;
    padding: 16px 18px;
    overflow-x: auto;
    background: var(--bg-code) !important;
    border: 1px solid var(--border);
    color: var(--text);
}
pre code { background: none; border: none; padding: 0; white-space: pre; font-size: inherit; }
pre code span[style*="color: #74747c"] { font-style: italic; }
math, .typ-math, .typ-equation, .typ-math-equation { font-family: var(--font-math); font-size: 1.1rem; }
figcaption { margin-top: 8px; font-size: 0.85em; color: var(--text-muted); text-align: center; }
img { max-width: 100%; height: auto; }
kbd {
    font-family: var(--font-code);
    font-size: 0.75em;
    padding: 0.1em 0.45em;
    border: 1px solid var(--border-strong);
    border-bottom-width: 2px;
    background: var(--bg-elevated);
    color: var(--text-muted);
}

/* Tables */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 1.2em 0 1.6em;
    border: 1px solid var(--border);
    overflow: hidden;
    font-size: 0.9rem;
}
table th, table td { padding: 10px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); }
table tr:last-child td { border-bottom: none; }
table th {
    background: var(--bg-soft);
    color: var(--text-muted);
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
table tbody tr:hover td { background: var(--bg-soft); }
main > table { display: block; overflow-x: auto; }
/* Wide tables scroll inside their own box instead of being clipped. */
.table-scroll {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
}

/* ============================================================
   Header
   ============================================================ */

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--header-h);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 20px;
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--border);
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    color: var(--text) !important;
    text-decoration: none !important;
    font-weight: 800;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
    white-space: nowrap;
}
/* The logo is drawn at 2 px per unit; keep it unscaled so its pixels stay whole. */
.brand-logo { width: 142px; height: 32px; flex-shrink: 0; }

/* Theme-specific artwork (logo and symbol variants). */
.only-dark { display: none; }
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .only-light { display: none; }
    :root:not([data-theme="light"]) .only-dark { display: revert; }
}
:root[data-theme="dark"] .only-light { display: none; }
:root[data-theme="dark"] .only-dark { display: revert; }
.brand-tag {
    font-family: var(--font-label);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--primary);
    background: var(--primary-soft);
    padding: 2px 7px;
    border: 1px solid var(--frame-1);
}

.search-trigger {
    flex: 1;
    max-width: 440px;
    margin-left: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    height: 38px;
    padding: 0 10px 0 12px;
    font: inherit;
    font-size: 0.9rem;
    color: var(--text-muted);
    background: var(--bg-soft);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: border-color 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}
.search-trigger:hover { border-color: var(--primary); background: var(--bg-elevated); }
.search-trigger-icon { font-size: 1.15rem; line-height: 1; }
.search-trigger-text { flex: 1; text-align: left; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.header-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.header-links a {
    padding: 6px 10px;
    font-family: var(--font-label);
    color: var(--text-soft);
    font-size: 0.84rem;
    font-weight: 600;
    text-decoration: none !important;
}
.header-links a:hover { color: var(--text); background: var(--bg-muted); }
.header-github { border: 1px solid var(--border); }

.icon-btn {
    display: inline-grid;
    flex-shrink: 0;
    place-items: center;
    width: 38px;
    height: 38px;
    font-size: 1.05rem;
    color: var(--text-soft);
    background: transparent;
    border: 1px solid var(--border);
    cursor: pointer;
}
.icon-btn:hover { color: var(--primary); border-color: var(--primary); background: var(--primary-soft); }
.nav-toggle-btn { display: none; }

/* Reading progress as a timeline: a bar and a square playhead under the header,
   driven by --page-progress (assets/script.js). */
.site-header::after, .site-header::before {
    content: "";
    position: absolute;
    left: 0;
    background: var(--primary);
    pointer-events: none;
}
.site-header::after { bottom: -1px; height: 2px; width: calc(var(--page-progress, 0) * 100%); }
.site-header::before {
    bottom: -4px;
    width: 8px;
    height: 8px;
    left: calc(var(--page-progress, 0) * (100% - 8px));
    opacity: var(--page-progress-on, 0);
}

/* Controls step forward one frame at a time and leave two ghost frames behind,
   like the symbol. */
.icon-btn, .search-trigger, .header-github, .copy-code-btn, .search-filter, .search-tip,
.home-hero-cta a, .home-card, .code-cell-anim .anim-preview img {
    transition: transform var(--frame-motion), box-shadow var(--frame-motion),
        border-color 0.12s ease, background 0.12s ease, color 0.12s ease;
}
:is(.icon-btn, .search-trigger, .header-github, .copy-code-btn, .search-filter, .search-tip,
    .home-hero-cta a, .home-card, .code-cell-anim .anim-preview img):hover {
    transform: translateX(3px);
    box-shadow: var(--frames);
}

/* Small labels use the code face: the interface reads like a timeline. */
.home-hero-kicker, .home-card-eyebrow, .home-step-number, .toc-title, .nav-sidebar summary,
table th, .code-header, .code-cell-anim .anim-preview::before, .api-badge, .kind-badge,
.api-params-title, .api-example-label, .search-group-title, .search-filter, .search-tip,
.search-footer, .copy-code-btn, .home-hero-cta a, .site-footer, .lesson-box-title {
    font-family: var(--font-label);
}

/* ============================================================
   Layout
   ============================================================ */

.layout-container {
    display: flex;
    align-items: flex-start;
    max-width: 1480px;
    margin: 0 auto;
}
.nav-sidebar, .toc-sidebar {
    position: sticky;
    top: var(--header-h);
    height: calc(100vh - var(--header-h));
    overflow-y: auto;
    scrollbar-width: thin;
    flex-shrink: 0;
}
.nav-sidebar {
    width: var(--sidebar-w);
    padding: 20px 14px 40px 20px;
    border-right: 1px solid var(--border);
    view-transition-name: global-sidebar;
}
.main-grid {
    flex: 1;
    min-width: 0;
    padding: 28px 48px 64px;
}
.main-grid > main, .breadcrumb, .site-footer { max-width: var(--content-w); margin-left: auto; margin-right: auto; }
.toc-sidebar { width: var(--toc-w); padding: 28px 20px 40px 8px; }

/* Sidebar navigation */
.nav-sidebar ul { list-style: none; margin: 0; padding: 0; }
.nav-sidebar > nav > ul > li { margin-bottom: 4px; }
.nav-sidebar a, .nav-sidebar summary {
    display: block;
    padding: 6px 10px;
    color: var(--text-soft);
    font-size: 0.9rem;
    line-height: 1.4;
    text-decoration: none !important;
    cursor: pointer;
    transition: background 0.1s ease, color 0.1s ease;
}
.nav-sidebar summary {
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-top: 10px;
}
.nav-sidebar summary::-webkit-details-marker { display: none; }
/* Sections are keyframes: hollow when closed, filled when open. */
.nav-sidebar summary::after {
    content: "";
    flex: none;
    width: 7px;
    height: 7px;
    margin-right: 3px;
    border: 1.5px solid var(--text-muted);
    transform: rotate(45deg);
}
.nav-sidebar details[open] > summary::after { background: var(--primary); border-color: var(--primary); }
.nav-sidebar details ul { margin: 2px 0 6px 10px; padding-left: 8px; border-left: 1px solid var(--border); }
.nav-sidebar a:hover, .nav-sidebar summary:hover { background: var(--bg-muted); color: var(--text); }
.nav-sidebar a.nav-active {
    color: var(--primary);
    background: var(--primary-soft);
    font-weight: 700;
    box-shadow: inset 3px 0 0 var(--primary);
}

/* Table of contents */
.toc-title {
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 10px;
}
.toc-sidebar ul, .toc-sidebar ol { list-style: none; margin: 0; padding: 0; }
.toc-sidebar ul ul, .toc-sidebar ol ol { padding-left: 12px; }
.toc-sidebar a {
    display: block;
    padding: 4px 0 4px 12px;
    border-left: 2px solid var(--border);
    color: var(--text-muted);
    font-size: 0.83rem;
    line-height: 1.45;
    text-decoration: none !important;
}
.toc-sidebar a:hover { color: var(--text); }
.toc-sidebar a.toc-active { color: var(--primary); border-left-color: var(--primary); font-weight: 600; }

/* Breadcrumb and footer */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-bottom: 18px;
    font-size: 0.84rem;
    color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb-sep { opacity: 0.6; }
.breadcrumb-current { color: var(--text-soft); font-weight: 600; }
.site-footer {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    margin-top: 64px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 0.78rem;
    color: var(--text-muted);
}
.site-footer span { margin-right: auto; }

/* ============================================================
   Code cells
   ============================================================ */

.code-cell, .code-cell-anim {
    margin: 1.4em 0;
    border: 1px solid var(--border);
    overflow: hidden;
    background: var(--bg-elevated);
    box-shadow: var(--shadow-sm);
}
.code-grid { display: flex; flex-direction: column; }
.code-header {
    padding: 8px 14px;
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
}
.code-source { position: relative; min-width: 0; overflow: auto; }
.code-source pre { margin: 0; border: none; }
.code-cell-anim .code-source { border-bottom: 1px solid var(--border); }
.code-result {
    display: flex;
    flex-direction: column;
    padding: 12px 14px;
    border-top: 1px solid var(--border);
    background: var(--bg-soft);
}
.code-result:empty { display: none; }
.code-result pre { margin: 0; }
.code-result img, .code-result-only img { display: block; margin: 0 auto; }
.code-result-only { display: flex; flex-direction: column; align-items: center; gap: 12px; margin: 1.4em 0; }

.code-cell-anim .anim-preview {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
    min-height: 200px;
    background:
        linear-gradient(var(--grid-line) 1px, transparent 1px) -1px -1px / 24px 24px,
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) -1px -1px / 24px 24px,
        var(--bg-soft);
}
.home-hero::after, .code-cell-anim .anim-preview::after {
    content: "";
    position: absolute;
    inset: 12px;
    pointer-events: none;
    background:
        linear-gradient(var(--corner) 0 0) top left / 16px 2px,
        linear-gradient(var(--corner) 0 0) top left / 2px 16px,
        linear-gradient(var(--corner) 0 0) top right / 16px 2px,
        linear-gradient(var(--corner) 0 0) top right / 2px 16px,
        linear-gradient(var(--corner) 0 0) bottom left / 16px 2px,
        linear-gradient(var(--corner) 0 0) bottom left / 2px 16px,
        linear-gradient(var(--corner) 0 0) bottom right / 16px 2px,
        linear-gradient(var(--corner) 0 0) bottom right / 2px 16px;
    background-repeat: no-repeat;
    --corner: var(--frame-1);
}
.code-cell-anim .anim-preview::before {
    content: "Vista previa";
    position: absolute;
    top: 10px;
    left: 12px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-muted);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    padding: 2px 9px;
    z-index: 1;
}
.code-cell-anim .anim-preview img {
    max-height: 480px;
    cursor: zoom-in;
}
/* A `# player` cell: the embed player covers the preview once it opened the
   recording; until then, and without WebGPU, the preview shows. */
.code-cell-anim .anim-stage {
    position: relative;
    display: inline-block;
    max-width: 100%;
    line-height: 0;
}
.code-cell-anim .anim-stage img { display: block; max-width: 100%; height: auto; }
.code-cell-anim .anim-stage iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}
.code-cell-anim .anim-stage.ready iframe { opacity: 1; pointer-events: auto; }

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    font: inherit;
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    cursor: pointer;
    opacity: 0;
}
.code-source:hover .copy-code-btn, .copy-code-btn:focus { opacity: 1; }
.copy-code-btn:hover { color: var(--primary); border-color: var(--primary); }
.copy-code-btn.copied { color: #fff; background: var(--success); border-color: var(--success); opacity: 1; }

.docs-example-error {
    margin: 4px 0;
    padding: 10px 12px;
    border: 1px solid color-mix(in srgb, var(--danger) 40%, transparent);
    border-left: 3px solid var(--danger);
    background: color-mix(in srgb, var(--danger) 8%, transparent);
    font-family: var(--font-code);
    font-size: 0.8rem;
    white-space: pre-wrap;
}

/* Lightbox */
.lightbox-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.86);
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity 0.18s ease;
    cursor: zoom-out;
}
.lightbox-modal.lightbox-show { opacity: 1; }
.lightbox-modal.lightbox-fade-out { opacity: 0; }
.lightbox-content { max-width: 94vw; max-height: 90vh; box-shadow: var(--shadow-lg); }
.lightbox-close { position: absolute; top: 14px; right: 24px; color: #fff; font-size: 36px; line-height: 1; cursor: pointer; opacity: 0.8; }
.lightbox-close:hover { opacity: 1; }

/* ============================================================
   API reference entries
   ============================================================ */

.api-entry {
    margin: 22px 0;
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    scroll-margin-top: calc(var(--header-h) + 16px);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
.api-entry:target, .api-entry.api-flash {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-ring);
}
.api-entry-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 10px;
    padding: 14px 16px 12px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, var(--bg-soft), var(--bg-elevated));
}
.api-name { font-family: var(--font-code); font-weight: 700; font-size: 1rem; color: var(--text); }
.api-signature {
    flex-basis: 100%;
    font-family: var(--font-code);
    font-size: 0.82rem;
    color: var(--text-soft);
    background: var(--bg-code);
    border: 1px solid var(--border);
    padding: 6px 10px;
    overflow-x: auto;
    white-space: nowrap;
}
.api-badge, .kind-badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 2px 8px;
    color: var(--kind-color, var(--text-muted));
    background: color-mix(in srgb, var(--kind-color, var(--text-muted)) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--kind-color, var(--text-muted)) 30%, transparent);
    white-space: nowrap;
}
.badge-method, .kind-method { --kind-color: var(--kind-method); }
.badge-factory, .kind-factory { --kind-color: var(--kind-factory); }
.badge-class, .kind-class, .kind-constructor { --kind-color: var(--kind-class); }
.badge-function, .kind-function { --kind-color: var(--kind-function); }
.badge-property, .kind-property, .kind-attribute { --kind-color: var(--kind-property); }
.badge-constant, .kind-constant { --kind-color: var(--kind-constant); }
.kind-property, .kind-attribute { --kind-color: var(--kind-property); }
.kind-constant, .kind-type { --kind-color: var(--kind-constant); }
.api-desc { padding: 14px 16px 2px; color: var(--text-soft); }
.api-params { padding: 10px 16px 0; }
.api-params-title, .api-example-label {
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 6px 0 8px;
}
.api-params .table-scroll { margin: 0 0 12px; }
.api-params table { margin: 0; font-size: 0.86rem; }
/* Keep descriptions readable when the table scrolls on a narrow screen. */
.api-params td:last-child { min-width: 15em; }
.api-required { font-size: 0.72rem; font-weight: 700; color: var(--danger); }
.api-returns {
    margin: 10px 16px 14px;
    padding: 9px 12px;
    font-size: 0.88rem;
    background: color-mix(in srgb, var(--success) 7%, transparent);
    border: 1px solid color-mix(in srgb, var(--success) 25%, transparent);
    color: var(--text-soft);
}
.api-returns-label { font-weight: 700; color: var(--success); }
.api-example { padding: 0 16px 14px; }
.api-example .code-cell, .api-example .code-cell-anim, .api-example pre { margin: 6px 0 0; }

/* ============================================================
   Search palette
   ============================================================ */

.search-overlay {
    position: fixed;
    inset: 0;
    z-index: 900;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 9vh 16px 16px;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(3px);
    animation: search-fade 0.12s ease;
}
.search-overlay[hidden] { display: none; }
@keyframes search-fade { from { opacity: 0; } to { opacity: 1; } }
.search-panel {
    width: min(720px, 100%);
    max-height: 78vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-elevated);
    border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: search-rise 0.14s ease;
}
@keyframes search-rise { from { transform: translateY(-8px); opacity: 0; } to { transform: none; opacity: 1; } }
.search-input-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}
.search-input-row .search-icon { font-size: 1.3rem; color: var(--primary); }
.search-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text);
    font: inherit;
    font-size: 1.05rem;
    padding: 6px 0;
}
.search-input::placeholder { color: var(--text-muted); }
.search-input::-webkit-search-cancel-button { display: none; }
.search-filters { display: flex; gap: 6px; padding: 10px 16px 0; flex-wrap: wrap; }
.search-filter {
    font: inherit;
    font-size: 0.78rem;
    font-weight: 600;
    padding: 3px 11px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
}
.search-filter[aria-pressed="true"] { color: var(--primary); border-color: var(--primary); background: var(--primary-soft); }
.search-results { overflow-y: auto; padding: 6px 8px 10px; }
.search-group-title {
    padding: 12px 10px 6px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
}
.search-result {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 2px 10px;
    align-items: start;
    padding: 9px 10px;
    color: var(--text) !important;
    text-decoration: none !important;
    cursor: pointer;
}
.search-result .kind-badge { grid-row: 1; margin-top: 2px; }
.search-result-name { font-family: var(--font-code); font-weight: 700; font-size: 0.92rem; overflow-wrap: anywhere; }
.search-result-name mark, .search-result-title mark { background: none; color: var(--primary); }
.search-result-where { grid-column: 3; grid-row: 1; font-size: 0.72rem; color: var(--text-muted); white-space: nowrap; padding-top: 3px; }
.search-result-signature {
    grid-column: 2 / 4;
    font-family: var(--font-code);
    font-size: 0.78rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.search-result-summary {
    grid-column: 2 / 4;
    font-size: 0.84rem;
    color: var(--text-soft);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.search-result-page { grid-template-columns: auto 1fr; }
.search-result-page .search-result-title { font-weight: 700; font-size: 0.92rem; }
.search-result-page .search-result-summary, .search-result-page .search-result-section { grid-column: 2; }
.search-result-section { font-size: 0.78rem; color: var(--primary); }
.search-result-icon {
    display: inline-grid;
    place-items: center;
    width: 22px;
    height: 22px;
    background: var(--bg-muted);
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 1px;
}
.search-result[aria-selected="true"], .search-result:hover { background: var(--primary-soft); }
.search-result[aria-selected="true"] { box-shadow: inset 3px 0 0 var(--primary); }
.search-empty { padding: 28px 16px; text-align: center; color: var(--text-muted); font-size: 0.92rem; }
.search-empty strong { color: var(--text); }
.search-tips { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin-top: 12px; }
.search-tip {
    font: inherit;
    font-size: 0.8rem;
    padding: 4px 10px;
    border: 1px solid var(--border);
    background: var(--bg-soft);
    color: var(--text-soft);
    cursor: pointer;
}
.search-tip:hover { border-color: var(--primary); color: var(--primary); }
.search-footer {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    padding: 9px 16px;
    border-top: 1px solid var(--border);
    background: var(--bg-soft);
    font-size: 0.74rem;
    color: var(--text-muted);
}
.search-footer span { display: inline-flex; align-items: center; gap: 5px; }

/* ============================================================
   Home page
   ============================================================ */

/* Hero surfaces follow the site theme: warm paper in light, neutral graphite in dark. */
.home-hero {
    --hero-bg: linear-gradient(180deg, #faf9f6 0%, #f3f1ea 100%);
    --hero-border: #e7e3d8;
    --hero-shadow: 0 12px 32px rgba(20, 17, 46, 0.08);
    --hero-title: var(--brand-ink);
    --hero-text: #4a4760;
    --hero-muted: #6b6880;
    --hero-kicker: var(--primary);
    --hero-chip-bg: #ffffff;
    --hero-chip-border: #e2ddd0;
    --hero-input-shadow: 0 8px 24px rgba(20, 17, 46, 0.1);
    --hero-cta-bg: var(--brand-ink);
    --hero-cta-text: #ffffff;
    --hero-cta2-bg: #ffffff;
    --hero-cta2-hover: #f7f5ef;
    --hero-cta2-border: #d9d4c6;
    --hero-cta2-text: var(--brand-ink);
    --hero-accent: var(--primary);
    --anim-surface: #f6f4ee;
    --anim-front: var(--brand-ink);
    --anim-violet: var(--brand-violet);
    --anim-haze: var(--brand-haze);
    --anim-grid: rgba(20, 17, 46, 0.07);
    --anim-axis: rgba(20, 17, 46, 0.22);
    --anim-label: #6b6880;
    --anim-accent: #f0a800;
}
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .home-hero {
        --hero-bg:
            radial-gradient(1000px 400px at 110% -20%, rgba(255, 201, 51, 0.14), transparent 60%),
            linear-gradient(135deg, #1a1a1a 0%, #222222 100%);
        --hero-border: rgba(255, 255, 255, 0.06);
        --hero-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
        --hero-title: var(--brand-paper);
        --hero-text: #c9c9d3;
        --hero-muted: #a1a1ad;
        --hero-kicker: var(--brand-gold);
        --hero-chip-bg: rgba(255, 255, 255, 0.06);
        --hero-chip-border: rgba(255, 255, 255, 0.18);
        --hero-input-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
        --hero-cta-bg: var(--brand-gold);
        --hero-cta-text: var(--brand-ink);
        --hero-cta2-bg: rgba(255, 255, 255, 0.06);
        --hero-cta2-hover: rgba(255, 255, 255, 0.14);
        --hero-cta2-border: rgba(255, 255, 255, 0.22);
        --hero-cta2-text: #ffffff;
        --hero-accent: var(--brand-gold);
        --anim-surface: #1e1e1e;
        --anim-front: var(--brand-gold);
        --anim-violet: var(--brand-violet);
        --anim-haze: #3f37a8;
        --anim-grid: rgba(255, 255, 255, 0.055);
        --anim-axis: rgba(255, 255, 255, 0.2);
        --anim-label: #a1a1ad;
        --anim-accent: var(--brand-gold);
    }
}
:root[data-theme="dark"] .home-hero {
    --hero-bg:
        radial-gradient(1000px 400px at 110% -20%, rgba(255, 201, 51, 0.14), transparent 60%),
        linear-gradient(135deg, #1a1a1a 0%, #222222 100%);
    --hero-border: rgba(255, 255, 255, 0.06);
    --hero-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
    --hero-title: var(--brand-paper);
    --hero-text: #c9c9d3;
    --hero-muted: #a1a1ad;
    --hero-kicker: var(--brand-gold);
    --hero-chip-bg: rgba(255, 255, 255, 0.06);
    --hero-chip-border: rgba(255, 255, 255, 0.18);
    --hero-input-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    --hero-cta-bg: var(--brand-gold);
    --hero-cta-text: var(--brand-ink);
    --hero-cta2-bg: rgba(255, 255, 255, 0.06);
    --hero-cta2-hover: rgba(255, 255, 255, 0.14);
    --hero-cta2-border: rgba(255, 255, 255, 0.22);
    --hero-cta2-text: #ffffff;
    --hero-accent: var(--brand-gold);
    --anim-surface: #1e1e1e;
    --anim-front: var(--brand-gold);
    --anim-violet: var(--brand-violet);
    --anim-haze: #3f37a8;
    --anim-grid: rgba(255, 255, 255, 0.055);
    --anim-axis: rgba(255, 255, 255, 0.2);
    --anim-label: #a1a1ad;
    --anim-accent: var(--brand-gold);
}
.home-hero {
    position: relative;
    overflow: hidden;
    margin: 0 0 28px;
    color: var(--hero-title);
    background: var(--hero-bg);
    border: 1px solid var(--hero-border);
    box-shadow: var(--hero-shadow);
    container-type: inline-size;
}
/* assets/hero.js draws the scene on this canvas, inside the stage's box. */
.home-hero > .home-hero-canvas {
    position: absolute;
    inset: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}
.home-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 12px;
    min-height: 470px;
    padding: 56px 44px 40px 48px;
}
.home-hero-copy { align-self: center; }
.home-hero-stage { min-height: 300px; }
@container (max-width: 780px) {
    .home-hero-grid { grid-template-columns: minmax(0, 1fr); min-height: 0; padding: 20px 22px 28px; }
    .home-hero-stage { order: -1; min-height: 230px; }
}
.home-hero > * { position: relative; z-index: 1; }
.home-hero h1 {
    color: var(--hero-title);
    font-size: clamp(2.3rem, 4.6vw, 3.4rem);
    line-height: 1.05;
    letter-spacing: -0.045em;
    margin: 0 0 16px;
    padding: 0;
    border: none;
}
.home-hero-accent { color: var(--hero-accent); }
.home-hero-kicker {
    display: inline-block;
    margin-bottom: 14px;
    padding: 4px 12px;
    border: 1px solid var(--hero-chip-border);
    background: var(--hero-chip-bg);
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--hero-kicker);
}
.home-hero-desc { max-width: 48ch; margin-bottom: 24px; font-size: 1.08rem; line-height: 1.65; color: var(--hero-text); }
.home-search { position: relative; max-width: 520px; margin-top: 22px; }
#home-search-input {
    width: 100%;
    height: 54px;
    padding: 0 18px 0 48px;
    font: inherit;
    font-size: 1.02rem;
    color: #18181b;
    background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' fill='none' stroke='%235b4af0' stroke-width='2.2' stroke-linecap='round'%3E%3Ccircle cx='8.5' cy='8.5' r='6'/%3E%3Cpath d='m13 13 5 5'/%3E%3C/svg%3E") no-repeat 17px center;
    border: 2px solid var(--hero-chip-border);
    box-shadow: var(--hero-input-shadow);
    outline: none;
    cursor: text;
}
#home-search-input:focus { border-color: var(--brand-violet); }
.home-search-hint { margin-top: 8px; font-size: 0.8rem; color: var(--hero-muted); }
.home-search-hint kbd { color: var(--hero-title); background: var(--hero-chip-bg); border-color: var(--hero-chip-border); }
.home-hero-cta { display: flex; flex-wrap: wrap; gap: 10px; }
.home-hero-cta a {
    display: inline-flex;
    align-items: center;
    padding: 10px 14px;
    font-weight: 700;
    font-size: 0.84rem;
    text-decoration: none !important;
}
.home-hero-cta a.primary { background: var(--hero-cta-bg); color: var(--hero-cta-text) !important; }
.home-hero-cta a.secondary { color: var(--hero-cta2-text) !important; background: var(--hero-cta2-bg); border: 1px solid var(--hero-cta2-border); }
.home-hero-cta a.secondary:hover { background: var(--hero-cta2-hover); }
#home-download { gap: 8px; }
.home-download-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    background: currentColor;
    -webkit-mask: var(--os-icon) center / contain no-repeat;
    mask: var(--os-icon) center / contain no-repeat;
}
.os-windows { --os-icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M0 2.3 6.5 1.4v6.1H0zM7.3 1.3 16 0v7.5H7.3zM0 8.3h6.5v6.2L0 13.6zM7.3 8.3H16V16l-8.7-1.2z'/%3E%3C/svg%3E"); }
.os-linux { --os-icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='5' fill='none' stroke='%23000' stroke-width='1.7'/%3E%3Ccircle cx='13.2' cy='8' r='2'/%3E%3Ccircle cx='5.4' cy='3.5' r='2'/%3E%3Ccircle cx='5.4' cy='12.5' r='2'/%3E%3C/svg%3E"); }
.os-macos .home-download-icon { display: none; }
.home-download-format { font-weight: 500; opacity: 0.75; }
.home-download-meta { margin-top: 10px; font-size: 0.8rem; color: var(--hero-muted); }
.home-download-meta a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }

/* The landing column is wider than reading pages so the hero has room to play. */
.main-grid > main.page-home, .main-grid > main.page-home ~ .site-footer { max-width: 1080px; }
.main-grid > main.page-home { container-type: inline-size; }
.page-home > p { max-width: 72ch; }

.home-features {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 4px 24px;
    margin: 0 0 12px;
    padding: 4px 4px 18px;
}
.home-feature { display: flex; flex-direction: column; gap: 4px; padding: 10px 0; }
.home-feature-title {
    display: flex;
    align-items: center;
    gap: 14px;
    font-weight: 750;
    color: var(--text);
}
/* A three-frame onion skin, like the symbol. */
.home-feature-title::before {
    content: "";
    flex: none;
    width: 8px;
    height: 8px;
    margin-left: 8px;
    background: var(--primary);
    box-shadow:
        -4px 0 0 color-mix(in srgb, var(--primary) 55%, transparent),
        -8px 0 0 color-mix(in srgb, var(--primary) 25%, transparent);
}
.home-feature-body { font-size: 0.9rem; line-height: 1.55; color: var(--text-muted); }
.home-features + h3 { margin-top: 1.4em; }
@container (max-width: 760px) {
    .home-features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@container (max-width: 420px) {
    .home-features { grid-template-columns: minmax(0, 1fr); }
}

.home-steps, .home-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin: 18px 0 30px;
}
.home-step, .home-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 18px;
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    box-shadow: var(--shadow-sm);
}
.home-step-number {
    display: inline-grid;
    place-items: center;
    width: 30px;
    height: 30px;
    background: var(--brand-ink);
    color: var(--brand-gold);
    font-weight: 800;
    font-size: 0.9rem;
    margin-bottom: 4px;
}
.home-step-title, .home-card-title { font-weight: 750; color: var(--text); font-size: 1rem; }
.home-step-body, .home-card-body { font-size: 0.9rem; line-height: 1.55; color: var(--text-muted); }
.home-card { color: inherit !important; text-decoration: none !important; }
.home-card:hover { border-color: var(--primary); }
.home-card-eyebrow { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--primary); }
.home-cards-learn .home-card-eyebrow { color: var(--success); }

/* Home: four doors, each with its main destination and a few shortcuts */
.home-doors { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.home-door { padding: 0; }
.home-door-main {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 18px 18px 12px;
    color: inherit !important;
    text-decoration: none !important;
}
.home-door-links {
    margin: 0;
    padding: 0 18px 16px;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.88rem;
}
.home-door-links a::before { content: "→ "; color: var(--text-muted); }
.home-more { margin: 8px 0 32px; font-size: 0.9rem; color: var(--text-muted); }

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 1240px) {
    .toc-sidebar { display: none; }
}
@media (max-width: 900px) {
    :root { --header-h: 56px; }
    .site-header { gap: 10px; padding: 0 12px; }
    .nav-toggle-btn { display: inline-grid; }
    .header-links a:not(.header-github) { display: none; }
    .search-trigger { flex: 0 0 auto; width: 38px; justify-content: center; padding: 0; margin-left: auto; }
    .search-trigger-text, .search-trigger-kbd { display: none; }
    .header-links { margin-left: 0; }
    .brand-tag { display: none; }
    .nav-sidebar {
        position: fixed;
        z-index: 60;
        top: var(--header-h);
        left: 0;
        bottom: 0;
        height: auto;
        background: var(--bg);
        box-shadow: var(--shadow-lg);
        transform: translateX(-105%);
        transition: transform 0.2s ease;
    }
    body.nav-open .nav-sidebar { transform: none; }
    body.nav-open .nav-backdrop { display: block; position: fixed; inset: var(--header-h) 0 0 0; z-index: 55; background: rgba(0, 0, 0, 0.4); }
    .main-grid { padding: 20px 18px 48px; }
    .search-overlay { padding-top: 12px; }
}
/* The logo is wider than the old text mark: drop the GitHub button before the icons shrink. */
@media (max-width: 400px) {
    .header-links { display: none; }
}
.nav-backdrop { display: none; }
@media print {
    .site-header, .nav-sidebar, .toc-sidebar, .breadcrumb, .site-footer { display: none; }
}

/* Page header */
.page-header { margin-bottom: 28px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.page-header h1 { margin-bottom: 8px; }
.page-lead { margin: 0; font-size: 1.12rem; line-height: 1.6; color: var(--text-muted) !important; }
.page-header + h2 { border-top: none; padding-top: 0; margin-top: 0.6em; }

/* Examples: the topic index and a page per topic */
.examples-filter { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 22px 0 6px; }
.examples-filter input {
    flex: 1 1 260px;
    max-width: 440px;
    padding: 9px 12px;
    border: 1px solid var(--border-strong);
    background: var(--bg-elevated);
    color: var(--text);
    font: inherit;
}
.examples-filter input:focus { outline: 2px solid var(--primary-ring); border-color: var(--primary); }
.examples-filter-count { font-size: 0.85rem; color: var(--text-muted); }
.examples-block h2 { margin-top: 30px; }
.examples-block-body { margin: 4px 0 0; color: var(--text-muted); }
.topic-cards { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); margin-top: 12px; }
.showcase-cards { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); margin-top: 12px; }
.topic-card { padding: 0 0 16px; overflow: hidden; }
.topic-card > span { padding: 0 16px; }
.topic-card-poster, .example-poster {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    background: #121212;
}
.topic-card-poster { border-bottom: 1px solid var(--border); margin-bottom: 10px; }
.examples-block[hidden], .topic-card[hidden] { display: none; }
.example-description { margin: 4px 0 0; }
.example-preview { margin: 14px 0 10px; }
.example-stage { position: relative; display: block; line-height: 0; }
.example-stage iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}
.example-stage.ready iframe { opacity: 1; pointer-events: auto; }
.example-play {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    padding: 10px 18px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(18, 18, 18, 0.82);
    color: #fff;
    font: inherit;
    font-weight: 700;
    line-height: 1.2;
    cursor: pointer;
}
.example-play:hover:not(:disabled) { background: var(--primary); border-color: var(--primary); }
.example-play:disabled { cursor: progress; }
.example-stage.ready .example-play { display: none; }
.example-poster { border: 1px solid var(--border); }
.example-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin: 0 0 12px; }
.example-action { font-weight: 650; }
.example-run { font-size: 0.85rem; }
.example-badge {
    padding: 2px 7px;
    border: 1px solid currentColor;
    color: var(--warning);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}
.example-code { margin: 0 0 8px; }
.example-code > summary { cursor: pointer; color: var(--text-muted); font-weight: 650; }
.example-code[open] > summary { margin-bottom: 8px; }