/* ゲームと同じ暗い宇宙を背景にし、読む部分は白いカードにまとめる。ネオン色とドット文字は見出しやラベルだけに使う。 */
@font-face { font-family: "Silkscreen"; src: url("../assets/fonts/silkscreen-400.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Silkscreen"; src: url("../assets/fonts/silkscreen-700.woff2") format("woff2"); font-weight: 700; font-display: swap; }
:root {
  color-scheme: dark;
  --bg: #060813;
  --band: #080b1c;
  --line: #1c2350;
  --frame: #33408a;
  --text: #e8ecfa;
  --text-2: #c3cbec;
  --muted: #9aa5cf;
  --label: #8fa0d8;
  --cyan: #7df9ff;
  --pink: #ff6ad5;
  --magenta: #ff2e88;
  --yellow: #ffe066;
  --green: #7dff7a;
  --purple: #c5a3ff;
  --card: #fff;
  --card-ink: #111522;
  --card-text: #252b3d;
  --card-muted: #50586f;
  --card-line: #e3e6f0;
  --card-link: #006b7d;
  --card-shadow: 0 12px 32px rgba(0, 0, 0, .35);
  --glow: 0 0 0 3px var(--cyan), 0 0 28px rgba(125, 249, 255, .45);
  --mono: ui-monospace, "Cascadia Code", "Noto Sans Mono CJK JP", Consolas, monospace;
  --sans: "Noto Sans CJK JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  --pixel: "Silkscreen", var(--sans);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.9 var(--sans); letter-spacing: .02em; -webkit-font-smoothing: antialiased; }
a { color: var(--cyan); text-underline-offset: .2em; }
a:hover { color: #c8fdff; text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--yellow); outline-offset: 3px; }
::selection { background: var(--magenta); color: #fff; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, h4 { color: #fff; line-height: 1.5; overflow-wrap: anywhere; }
h1 { font-size: clamp(2rem, 4.2vw, 2.9rem); margin: 0 0 1.2rem; }
h2 { font-size: 2rem; margin: 0 0 1rem; }
h3 { font-size: 1.19rem; }
p { margin: 0 0 1.1rem; }
ul, ol { padding-left: 1.5rem; }
li { margin: .45rem 0; }
code, pre, kbd { font-family: var(--mono); }
code { overflow-wrap: anywhere; }
:not(pre) > code { font-size: .86em; color: #c8f7ff; background: #161c45; border-radius: 4px; padding: .1em .4em; }
pre { margin: 0; padding: 16px 20px; overflow-x: auto; font-size: 14.5px; line-height: 1.85; letter-spacing: 0; color: #dfe6ff; tab-size: 2; }
pre code { overflow-wrap: normal; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }
.skip-link { position: fixed; left: 1rem; top: -120px; padding: .6rem 1rem; background: var(--yellow); color: #161200; font-weight: 700; border-radius: 6px; z-index: 20; }
.skip-link:focus { top: .6rem; }

/* 白いカード。ネオン色のラベルは塗りつぶしにして、黒い文字を載せる。 */
:is(.screen-card, .play-steps li, .rules, .table-wrap, .powerup, .special, .faq-list details, .source-callout, .reading-path a, .chapter-card, .chapter-toc, .lab, .note, .exercise, .page-nav a, .flow li) {
  background: var(--card); color: var(--card-text); border-radius: 12px; box-shadow: var(--card-shadow);
}
:is(.screen-card, .play-steps li, .rules, .table-wrap, .powerup, .special, .faq-list details, .source-callout, .reading-path a, .chapter-card, .chapter-toc, .lab, .note, .exercise, .page-nav a, .flow li) :is(h2, h3, h4, strong, summary, th) { color: var(--card-ink); }
:is(.screen-card, .rules, .table-wrap, .powerup, .special, .faq-list details, .source-callout, .lab, .note, .exercise, .flow li) a:not(.button) { color: var(--card-link); }
:is(.screen-card, .rules, .table-wrap, .powerup, .special, .faq-list details, .source-callout, .lab, .note, .exercise, .flow li) a:not(.button):hover { color: #00495a; }
:is(.screen-card, .play-steps li, .rules, .table-wrap, .powerup, .special, .faq-list details, .source-callout, .lab, .note, .exercise, .page-nav a, .flow li) :not(pre) > code { color: #1b2150; background: #eceffa; }
.chapter-card, .reading-path a, .page-nav a { transition: box-shadow .15s, transform .15s; }
.chapter-card:hover, .reading-path a:hover, .page-nav a:hover { box-shadow: var(--glow); transform: translateY(-2px); text-decoration: none; }
.tag, .chapter-number, .path-num { font-family: var(--pixel); font-weight: 400; color: var(--card-ink); border-radius: 4px; }

.site-header { position: sticky; top: 0; z-index: 10; background: rgba(6, 8, 19, .9); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.header-inner { max-width: 1180px; margin: auto; min-height: 72px; padding: 12px 24px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 28px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font: 400 18px/1.4 var(--pixel); letter-spacing: .06em; color: #eaffff; }
.brand:hover { color: var(--cyan); }
.brand-mark { display: block; background: #080b1b; width: 36px; height: 36px; border-radius: 8px; flex-shrink: 0; box-shadow: 0 0 14px rgba(125, 249, 255, .35); }
.header-links { display: flex; flex-wrap: wrap; gap: 4px 22px; align-items: center; font-size: 14px; }
.header-links a { color: var(--text-2); text-decoration: none; padding: 6px 0; }
.header-links a:hover { color: var(--cyan); }
.header-links a:is([href$="game.html"], [href$="game.html?lang=en"]) { order: 1; display: inline-flex; align-items: center; min-height: 40px; padding: 0 16px; background: var(--yellow); color: #161200; font-weight: 700; border-radius: 8px; }
.header-links a:is([href$="game.html"], [href$="game.html?lang=en"]):hover { background: #fff0a8; color: #161200; }
.container { max-width: 1132px; margin: auto; padding: 0 24px; }

.hero, .game-hero {
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1.6px 1.6px at 8% 22%, rgba(255, 255, 255, .75), transparent 70%),
    radial-gradient(1.2px 1.2px at 21% 64%, rgba(255, 255, 255, .55), transparent 70%),
    radial-gradient(1.4px 1.4px at 37% 12%, rgba(200, 247, 255, .7), transparent 70%),
    radial-gradient(1.2px 1.2px at 46% 82%, rgba(255, 255, 255, .5), transparent 70%),
    radial-gradient(1.8px 1.8px at 58% 38%, rgba(255, 255, 255, .6), transparent 70%),
    radial-gradient(1.2px 1.2px at 69% 9%, rgba(255, 180, 232, .7), transparent 70%),
    radial-gradient(1.4px 1.4px at 88% 74%, rgba(255, 255, 255, .6), transparent 70%),
    radial-gradient(1.2px 1.2px at 94% 28%, rgba(255, 255, 255, .5), transparent 70%),
    radial-gradient(700px 460px at 82% 40%, rgba(40, 110, 150, .16), transparent 70%),
    radial-gradient(1200px 720px at 50% -220px, #161e4a, var(--bg) 72%);
}
.hero-inner { display: grid; grid-template-columns: minmax(0, 1fr) 300px; align-items: center; gap: 48px 72px; padding-top: 72px; padding-bottom: 72px; }
.eyebrow { font: 400 13px/1.6 var(--pixel); letter-spacing: .24em; color: var(--cyan); margin: 0 0 18px; }
.hero h1 { margin: 0; line-height: 1.45; }
.hero h1 span { display: block; margin-bottom: 14px; font: 400 20px/1.3 var(--pixel); letter-spacing: .12em; color: var(--pink); text-shadow: 2px 2px 0 rgba(255, 46, 136, .35); }
.lead { color: var(--text-2); font-size: 1em; line-height: 2; max-width: 40em; }
.hero .lead { margin: 24px 0 0; max-width: 34em; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.button { display: inline-flex; align-items: center; min-height: 50px; padding: 0 26px; background: var(--yellow); color: #161200; border: 1px solid var(--yellow); border-radius: 8px; font-size: 16px; font-weight: 700; text-decoration: none; box-shadow: 0 0 26px rgba(255, 224, 102, .3); }
.button:hover { background: #fff0a8; color: #161200; text-decoration: none; }
.button.secondary { background: rgba(13, 17, 48, .7); color: #dfe6ff; border-color: #5d6bb8; box-shadow: none; }
.button.secondary:hover { background: rgba(13, 17, 48, .95); color: #fff; border-color: var(--cyan); }
.hero-figure { margin: 0; }
.hero-figure a { display: block; position: relative; padding: 8px; background: #020308; border: 2px solid var(--frame); border-radius: 14px; box-shadow: 0 0 44px rgba(96, 158, 255, .3), 0 0 120px rgba(255, 46, 136, .14); }
.hero-figure a::after { content: ""; position: absolute; inset: 8px; border-radius: 6px; pointer-events: none; background: repeating-linear-gradient(to bottom, rgba(255, 255, 255, .035) 0 1px, transparent 1px 3px); }
.hero-figure img { width: 100%; border-radius: 6px; }
figcaption { font-size: 13px; color: var(--muted); margin-top: 12px; line-height: 1.7; }
.hero-figure figcaption { text-align: center; }
.meta-band { background: var(--band); border-bottom: 1px solid var(--line); }
.meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px 24px; padding: 18px 0; margin: 0; list-style: none; font-size: 15px; color: var(--text); }
.meta li { display: flex; flex-direction: column; gap: 2px; margin: 0; }
.meta-label { font: 400 11px/1.6 var(--pixel); letter-spacing: .18em; color: var(--label); }

.section { padding-top: 104px; }
main > .section:last-child { padding-bottom: 112px; }
.kicker { font: 400 13px/1.4 var(--pixel); letter-spacing: .24em; color: var(--cyan); margin: 0 0 12px; }
.kicker.yellow { color: var(--yellow); }
.kicker.green { color: var(--green); }
.kicker.pink { color: var(--pink); }
.kicker.purple { color: var(--purple); }
.section-heading { display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: baseline; justify-content: space-between; }
.section-heading h2 { margin: 0; }
.section-heading p { margin: 0; font-size: 14px; color: var(--muted); }
.section > .lead, .section-heading + .lead { margin-top: 16px; }

.reading-path { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 14px; padding: 0; list-style: none; margin: 36px 0 0; }
.reading-path li { margin: 0; }
.reading-path a { display: flex; flex-direction: column; gap: 6px; height: 100%; padding: 20px; text-decoration: none; }
.reading-path .path-num { display: grid; place-items: center; width: 40px; height: 40px; margin-bottom: 8px; font-size: 15px; background: var(--yellow); border-radius: 6px; }
.reading-path span:not(.path-num) { font-size: 13px; color: var(--card-muted); }
.reading-path strong { font-size: 17px; line-height: 1.6; }
.category-nav { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0 0; }
.category-nav a { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; padding: 0 18px; font-size: 14px; font-weight: 700; color: #d5dbf2; text-decoration: none; background: #0c1028; border: 1px solid #2a3470; border-radius: 999px; }
.category-nav a::before { content: ""; width: 8px; height: 8px; background: var(--dot); box-shadow: 0 0 8px var(--dot); }
.category-nav a:nth-child(1) { --dot: var(--cyan); }
.category-nav a:nth-child(2) { --dot: var(--green); }
.category-nav a:nth-child(3) { --dot: var(--pink); }
.category-nav a:nth-child(4) { --dot: var(--purple); }
.category-nav a:hover { color: #fff; border-color: var(--cyan); }
.chapter-group { --group: var(--cyan); margin-top: 64px; }
.chapter-group + .chapter-group { margin-top: 72px; }
#gameplay { --group: var(--green); }
#advanced { --group: var(--pink); }
#finishing { --group: var(--purple); }
.group-heading { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 18px; border-bottom: 1px solid #1f275a; padding-bottom: 14px; }
.group-heading h3 { margin: 0; font-size: 22px; }
.group-heading span { font: 400 13px var(--pixel); letter-spacing: .16em; color: var(--group); }
.chapter-group > p { margin: 14px 0 0; font-size: .97em; color: var(--text-2); }
.chapter-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 22px; }
.chapter-card { display: flex; flex-direction: column; gap: 10px; padding: 24px; text-decoration: none; }
.chapter-card:hover h4 { text-decoration: underline; text-underline-offset: .25em; }
.chapter-number { align-self: flex-start; padding: 2px 9px; font-size: 16px; line-height: 1.6; background: var(--group); }
.chapter-card h4 { font-size: 18px; line-height: 1.6; margin: 0; }
.chapter-card p { flex: 1; color: var(--card-text); font-size: .92em; line-height: 1.9; margin: 0; }
.chapter-card .card-link { font-size: 14px; font-weight: 700; color: var(--card-link); }
.flow { display: flex; align-items: stretch; flex-wrap: wrap; gap: 12px; list-style: none; padding: 0; margin: 28px 0; }
.flow li { flex: 1; min-width: 150px; padding: 18px 20px; margin: 0; }
.flow strong, .flow small { display: block; }
.flow small { color: var(--card-muted); font-size: .85em; line-height: 1.8; margin-top: 4px; }
.flow li:not(:last-child) strong::after { content: " →"; color: var(--card-link); }
.resource-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; margin-top: 28px; }
.resource-grid h3 { margin-top: 0; font-size: 20px; }
.resource-grid p { color: var(--text-2); }

.site-footer { border-top: 1px solid var(--line); background: #04050c; padding: 32px 0 40px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.footer-inner { display: flex; gap: 16px 40px; flex-wrap: wrap; justify-content: space-between; }
.site-footer p { margin: 0; }
.site-footer p:first-child::first-line { font-family: var(--pixel); letter-spacing: .1em; color: var(--text-2); }
.site-footer a { color: var(--text-2); }
.site-footer a:hover { color: var(--cyan); }

/* 解説記事。広い画面では目次を左に置き、本文は1行40字程度に収める。 */
.doc-layout { max-width: 1240px; margin: 0 auto; padding: 40px 24px 104px; display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 40px 64px; align-items: start; }
.chapter-toc { padding: 14px 12px 18px; font-size: 13.5px; }
.chapter-toc summary { display: flex; align-items: center; gap: 10px; min-height: 40px; padding: 0 10px; font-size: 14px; font-weight: 700; cursor: pointer; list-style: none; }
.chapter-toc summary::-webkit-details-marker { display: none; }
.chapter-toc summary::before { content: ""; width: 7px; height: 7px; border-right: 2px solid var(--card-link); border-bottom: 2px solid var(--card-link); transform: rotate(-45deg); transition: transform .2s; }
.chapter-toc[open] summary::before { transform: rotate(45deg); }
.chapter-toc nav { display: flex; flex-direction: column; gap: 18px; margin-top: 12px; }
.chapter-toc .nav-group { display: flex; align-items: center; gap: 8px; margin: 0 0 6px; padding: 0 10px; font-size: 12px; font-weight: 700; letter-spacing: .06em; color: var(--card-muted); }
.chapter-toc .nav-group::before { content: ""; width: 6px; height: 6px; background: var(--group-dark); }
.toc-group:nth-child(1) { --group-dark: #00a3b8; }
.toc-group:nth-child(2) { --group-dark: #1f7a32; }
.toc-group:nth-child(3) { --group-dark: #c0158a; }
.toc-group:nth-child(4) { --group-dark: #6a3fc0; }
.chapter-toc ol { list-style: none; padding: 0; margin: 0; }
.chapter-toc li { margin: 0; }
.chapter-toc a { display: flex; gap: 10px; padding: 6px 10px; color: var(--card-text); text-decoration: none; line-height: 1.6; border-radius: 6px; overflow-wrap: anywhere; }
.chapter-toc a span { flex: none; font-family: var(--mono); font-size: 12px; color: #5d6580; }
.chapter-toc a:hover { background: #eef1fa; color: var(--card-ink); }
.chapter-toc a[aria-current="page"] { background: #e3fbfd; color: var(--card-ink); font-weight: 700; box-shadow: inset 0 0 0 2px #00a3b8; }
.chapter-toc a[aria-current="page"] span { color: var(--card-link); }
.doc-main { min-width: 0; }
.breadcrumb { font-size: 13px; color: var(--muted); margin: 0 0 26px; }
.article { max-width: 760px; }
.article-header { padding-bottom: 32px; border-bottom: 1px solid var(--line); }
.article-header .eyebrow { letter-spacing: .2em; margin: 0; }
.article h1 { font-size: clamp(1.9rem, 4vw, 2.5rem); line-height: 1.45; margin: 14px 0 16px; }
.article-header .lead { font-size: 1.08em; margin: 0; }
.source-ref { font-size: 13px; color: var(--muted); margin: 20px 0 0; }
.article h2 { display: flex; align-items: flex-start; gap: 14px; font-size: 25px; line-height: 1.55; margin: 56px 0 18px; }
.article h2::before { content: ""; flex: none; width: 10px; height: 10px; margin-top: .6em; background: var(--cyan); box-shadow: 0 0 10px var(--cyan); }
.article h3 { margin-top: 32px; }
.article p, .article li { overflow-wrap: anywhere; }
.article > p, .article > ul, .article > ol:not(.flow) { max-width: 40em; color: #dfe4f5; line-height: 2.05; }
.article > p { margin: 0 0 1.4em; }
.article li::marker { color: var(--pink); }
.code-block { background: #04050c; border: 1px solid #222a5c; border-radius: 10px; margin: 24px 0 28px; overflow: hidden; }
.code-block figcaption { margin: 0; padding: 9px 16px; background: #0a0d22; border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 16px; font: 12.5px/1.7 var(--mono); color: var(--label); }
.code-block figcaption a { font: 700 13px/1.7 var(--sans); text-decoration: none; }
.code-block figcaption a:hover { text-decoration: underline; }
/* guide.js が付ける行番号と色分け。JavaScript がなくてもコードはそのまま読める。 */
pre.has-lines { padding-left: 8px; }
.code-line { display: block; }
.has-lines .code-line::before { counter-increment: line; content: counter(line); display: inline-block; width: 5ch; margin-right: 2ch; text-align: right; color: #4b5689; user-select: none; }
.tok-k { color: var(--pink); }
.tok-f { color: var(--cyan); }
.tok-n { color: var(--yellow); }
.tok-s { color: var(--green); }
.tok-c { color: #7c88b5; }
.note, .exercise { margin: 32px 0; padding: 20px 24px; }
.note p, .exercise p { line-height: 2; }
.note p:last-child, .exercise p:last-child { margin: 0; }
.note > strong, .exercise > strong { display: flex; align-items: center; gap: 10px; font-size: 15px; margin-bottom: 8px; }
.note > strong::before, .exercise > strong::before, .lab h3::before { padding: 1px 8px; font: 400 11px/1.8 var(--pixel); letter-spacing: .14em; color: var(--card-ink); border-radius: 4px; }
.note > strong::before { content: "POINT"; background: var(--yellow); }
.exercise > strong::before { content: "TRY"; background: var(--green); }
.table-wrap { overflow-x: auto; margin: 24px 0; }
table { width: 100%; border-collapse: collapse; font-size: .92em; }
th, td { text-align: left; vertical-align: top; padding: 12px 16px; border-bottom: 1px solid var(--card-line); }
tr:last-child > * { border-bottom: 0; }
thead th { background: #f1f3fa; font-size: 13px; color: var(--card-muted); }
td:first-child { font-weight: 700; color: var(--card-ink); }
.shot { margin: 28px auto; max-width: 300px; }
.shot.wide { max-width: 100%; }
.shot img { padding: 6px; background: #020308; border: 2px solid var(--frame); border-radius: 12px; box-shadow: 0 0 36px rgba(96, 158, 255, .22); }
.shot figcaption { text-align: center; }
.page-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 64px; max-width: 760px; }
.page-nav a { display: flex; flex-direction: column; gap: 6px; padding: 20px 24px; color: var(--card-ink); font-size: 17px; font-weight: 700; line-height: 1.6; text-decoration: none; }
.page-nav a:last-child { align-items: flex-end; text-align: right; }
.page-nav span { display: block; color: var(--card-muted); font-size: 13px; font-weight: 400; }
.lab { padding: 24px; margin: 32px 0; }
.lab h3 { display: flex; align-items: center; gap: 12px; margin: 0 0 10px; font-size: 18px; }
.lab h3::before { content: "LAB"; background: var(--green); }
.lab p { color: var(--card-text); font-size: .94em; }
.lab label { display: block; font-size: 14px; font-weight: 700; margin: 16px 0 6px; color: var(--card-ink); }
.lab input[type="range"] { width: 100%; max-width: 360px; accent-color: #00a3b8; }
.lab textarea { width: 100%; padding: 12px; line-height: 1.5; background: #04050c; color: var(--green); border: 1px solid #c9cfe0; border-radius: 8px; font-family: var(--mono); resize: vertical; }
.lab canvas { display: block; width: 100%; max-width: 360px; height: auto; background: #04050c; border: 1px solid #222a5c; border-radius: 8px; margin: 12px 0 10px; }
.lab output { display: block; font: 14px/1.7 var(--mono); color: var(--card-ink); margin-top: 8px; }
.lab input[type="color"] { width: 64px; height: 38px; border: 1px solid #c9cfe0; border-radius: 6px; background: #fff; }
.lab noscript { display: block; padding: 12px; }
@media (max-width: 960px) {
  .hero-inner { gap: 40px; grid-template-columns: minmax(0, 1fr) 240px; }
  .reading-path { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .chapter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .doc-layout { grid-template-columns: minmax(0, 1fr); gap: 28px; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  html { scroll-padding-top: 150px; }
  .header-inner { padding: 12px 18px; gap: 8px 18px; }
  .brand { font-size: 15px; }
  .header-links { font-size: 13px; gap: 4px 16px; }
  .container { padding-left: 20px; padding-right: 20px; }
  .hero-inner { grid-template-columns: 1fr; padding-top: 44px; padding-bottom: 52px; gap: 36px; }
  .hero-figure { width: 100%; max-width: 240px; margin: 0 auto; }
  .section { padding-top: 72px; }
  main > .section:last-child { padding-bottom: 80px; }
  h2 { font-size: 1.6rem; }
  .reading-path { grid-template-columns: 1fr; }
  .reading-path a { flex-direction: row; flex-wrap: wrap; align-items: center; column-gap: 14px; }
  .reading-path .path-num { margin: 0; }
  .resource-grid { grid-template-columns: 1fr; gap: 20px; }
  .doc-layout { padding: 24px 16px 72px; }
  .article h2 { font-size: 21px; margin-top: 44px; }
  .page-nav { gap: 10px; }
  .page-nav a { padding: 14px 16px; font-size: 15px; }
}
@media (max-width: 460px) {
  .chapter-grid { grid-template-columns: 1fr; }
  .chapter-card { padding: 20px; }
  .page-nav { grid-template-columns: 1fr; }
  .page-nav a:last-child { align-items: flex-start; text-align: left; }
  .lab { padding: 16px; }
  .note, .exercise { padding: 16px 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .chapter-card, .reading-path a, .page-nav a { transition: none; }
  .chapter-card:hover, .reading-path a:hover, .page-nav a:hover { transform: none; }
}
@media print {
  :root { color-scheme: light; }
  .site-header, .site-footer, .chapter-toc, .page-nav, .actions, .skip-link, .lab, .hero-figure { display: none; }
  body { background: #fff; color: #000; font-size: 11pt; }
  h1, h2, h3, h4, .lead, .article > p, .article > ul, .article > ol, .eyebrow, .kicker, .meta, .meta-label, .breadcrumb, .source-ref, .resource-grid p, .chapter-group > p { color: #000 !important; text-shadow: none !important; }
  .hero, .game-hero, .meta-band { background: none; border: 0; }
  .doc-layout, .container { display: block; padding: 0; max-width: none; }
  .hero-inner { display: block; padding: 0; }
  .section { padding-top: 24pt; }
  :is(.screen-card, .play-steps li, .rules, .table-wrap, .powerup, .special, .faq-list details, .source-callout, .reading-path a, .chapter-card, .note, .exercise, .flow li) { box-shadow: none; border: 1px solid #bbb; }
  .code-block { background: #f4f4f4; border-color: #bbb; }
  .code-block figcaption { background: #e8e8e8; color: #333; }
  pre { color: #000; white-space: pre-wrap; overflow-wrap: anywhere; }
  pre code { overflow-wrap: anywhere; }
  .tok-k, .tok-f, .tok-n, .tok-s, .tok-c { color: inherit; }
  .chapter-card, .code-block, tr, figure { break-inside: avoid; }
  a { color: inherit; }
}