/* Modern C++ Tutorial. One stylesheet for every page.
   The book's burgundy (the cover's) is the single accent on a white page;
   everything else is a warm gray. Inter sets the text, JetBrains Mono the
   code, and both fall back to the system's own faces, which is what most
   readers in mainland China will see. */

:root {
  --bg: #ffffff;
  --bg-2: #f7f6f5;
  --bg-3: #efedeb;
  --ink: #1d1a1b;
  --text: #2d2a2b;
  --ink-2: #514c4e;
  --ink-3: #7c7678;
  --rule: #e9e6e4;
  --rule-2: #dcd8d6;

  --accent: #7e2d36;
  --accent-ink: #66232b;
  --accent-soft: #f8eff0;
  --accent-line: rgba(126, 45, 54, 0.26);

  --code-bg: #f9f8f7;
  --code-ink: #2b2729;
  --hl-kw: #9a2c3a;
  --hl-type: #6b3fa0;
  --hl-fn: #1f5c96;
  --hl-str: #2e7639;
  --hl-num: #a8550d;
  --hl-com: #8a8486;
  --hl-meta: #6f696b;

  --font-ui: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "PingFang SC", "Microsoft YaHei", monospace;

  --top: 56px;
  --side: 268px;
  --outline: 232px;
  --col: 744px;
  --max: 1440px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--top) + 24px);
}
body {
  margin: 0;
  padding-top: var(--top);
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.7 var(--font-ui);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a { color: var(--accent); }
a:hover { color: var(--accent-ink); }
img { border: 0; }
::selection { background: rgba(126, 45, 54, 0.16); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; }
.skip:focus { left: 12px; background: var(--bg); padding: 6px 12px; border: 1px solid var(--rule); border-radius: 8px; }

/* -------------------------------------------------------------- top bar */
/* Fixed, not sticky, so elastic scrolling bounces only the page. */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 40;
  height: var(--top);
  display: flex; align-items: center; gap: 12px;
  padding: 0 16px 0 20px;
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: saturate(1.8) blur(14px);
  backdrop-filter: saturate(1.8) blur(14px);
  border-bottom: 1px solid var(--rule);
}
.brand {
  display: flex; align-items: center; gap: 10px; flex: none;
  color: var(--ink); text-decoration: none;
  font-size: 15px; font-weight: 650; letter-spacing: -0.01em; white-space: nowrap;
}
.brand:hover { color: var(--accent); }
.brand img { width: 20px; height: 26px; border-radius: 2px; box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.06), 0 2px 6px rgba(60, 15, 20, 0.18); }
.crumbs {
  flex: 1; min-width: 0;
  display: flex; align-items: baseline; gap: 8px;
  font-size: 13.5px; color: var(--ink-3); white-space: nowrap; overflow: hidden;
}
.crumbs-sep { color: var(--rule-2); }
.crumbs-label { color: var(--ink-2); font-weight: 500; flex: none; }
.crumbs-name { overflow: hidden; text-overflow: ellipsis; }
.topbar-tools { display: flex; align-items: center; gap: 2px; flex: none; }
.tool {
  height: 36px; min-width: 36px; padding: 0 9px;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border-radius: 8px; color: var(--ink-2); text-decoration: none;
  font-size: 13.5px; font-weight: 500;
}
.tool:hover { background: var(--bg-2); color: var(--ink); }
.tool-lang { font-weight: 600; }
.menu-btn {
  display: none; flex: none;
  width: 36px; height: 36px; margin-left: -8px;
  border: 0; border-radius: 8px; background: none; color: var(--ink-2); cursor: pointer;
  place-items: center;
}
.menu-btn:hover { background: var(--bg-2); color: var(--ink); }
.menu-btn span, .menu-btn span::before, .menu-btn span::after {
  display: block; width: 16px; height: 1.6px; border-radius: 1px; background: currentColor; content: "";
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.menu-btn span { position: relative; }
.menu-btn span::before { position: absolute; top: -5px; }
.menu-btn span::after { position: absolute; top: 5px; }
.nav-open .menu-btn span { background: transparent; }
.nav-open .menu-btn span::before { transform: translateY(5px) rotate(45deg); }
.nav-open .menu-btn span::after { transform: translateY(-5px) rotate(-45deg); }

/* --------------------------------------------------------------- layout */
/* Three columns: the book's contents, the text, and the page's outline. The
   two side columns are fixed to the window; the grid only reserves room. */
.layout {
  display: grid;
  grid-template-columns: var(--side) minmax(0, 1fr) var(--outline);
  max-width: var(--max);
  margin: 0 auto;
}
.layout.no-outline { grid-template-columns: var(--side) minmax(0, 1fr); }
.main { grid-column: 2; min-width: 0; padding: 0 48px; }
.article { max-width: var(--col); margin: 0 auto; padding: 52px 0 8px; }

.sidebar {
  position: fixed; top: var(--top); bottom: 0; z-index: 30;
  left: max(0px, calc((100% - var(--max)) / 2));
  width: var(--side);
  overflow-y: auto; overscroll-behavior: contain;
  padding: 28px 14px 40px 18px;
  border-right: 1px solid var(--rule);
  background: var(--bg);
  font-size: 14px; line-height: 1.4;
  scrollbar-width: thin; scrollbar-color: var(--rule-2) transparent;
}
.nav-head {
  margin: 0 0 6px; padding: 0 10px;
  font-size: 11.5px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3);
}
.nav-list + .nav-head { margin-top: 26px; }
.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-list li { margin: 1px 0; }
.nav-list a {
  display: flex; gap: 10px; align-items: baseline;
  padding: 6px 10px; border-radius: 8px;
  color: var(--ink-2); text-decoration: none;
}
.nav-list a:hover { background: var(--bg-2); color: var(--ink); }
.nav-list a[aria-current] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.nav-num {
  flex: none; width: 1.75em;
  font: 500 12px/1 var(--font-mono); color: var(--ink-3);
}
.nav-list a[aria-current] .nav-num { color: var(--accent); }
.nav-about .nav-num { width: 0; margin-right: -10px; }
.nav-downloads {
  display: flex; flex-wrap: wrap; gap: 6px 16px;
  margin: 24px 10px 0; padding-top: 16px; border-top: 1px solid var(--rule);
  font-size: 13px;
}
.nav-downloads a { color: var(--ink-3); text-decoration: none; }
.nav-downloads a:hover { color: var(--accent); }

.outline {
  position: fixed; top: var(--top); bottom: 0;
  right: max(0px, calc((100% - var(--max)) / 2));
  width: var(--outline);
  overflow-y: auto; overscroll-behavior: contain;
  padding: 56px 24px 40px 0;
  font-size: 13px; line-height: 1.4;
  scrollbar-width: thin; scrollbar-color: var(--rule-2) transparent;
}
.outline-head {
  margin-bottom: 12px;
  font-size: 11.5px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3);
}
.outline ol { list-style: none; margin: 0; padding: 0; }
.outline > ol { border-left: 1px solid var(--rule); }
.outline a {
  display: block; margin-left: -1px; padding: 4px 0 4px 14px;
  border-left: 2px solid transparent;
  color: var(--ink-3); text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
}
.outline a:hover { color: var(--ink); }
.outline a.active { color: var(--accent); border-left-color: var(--accent); font-weight: 500; }
.outline .toc-child a { padding-left: 26px; font-size: 12.5px; }

/* -------------------------------------------------------------- article */
.article { font-size: 16.5px; line-height: 1.75; overflow-wrap: break-word; }
.article h1, .article h2, .article h3, .article h4 { color: var(--ink); line-height: 1.3; position: relative; }
.article h1 { font-size: 2.3rem; font-weight: 700; letter-spacing: -0.028em; line-height: 1.18; margin: 0 0 0.9em; }
.chapter-num {
  display: block; margin-bottom: 0.7em;
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent);
}
.article h2 {
  font-size: 1.55rem; font-weight: 700; letter-spacing: -0.02em;
  margin: 2.6em 0 0.8em; padding-top: 1.3em; border-top: 1px solid var(--rule);
}
.article h1 + h2 { margin-top: 0; padding-top: 0; border-top: 0; }
.article h3 { font-size: 1.2rem; font-weight: 650; letter-spacing: -0.012em; margin: 2.2em 0 0.6em; }
.article h4 { font-size: 1.02rem; font-weight: 650; margin: 1.8em 0 0.5em; }
.headerlink {
  position: absolute; left: -1.15em; width: 1em; text-align: center;
  color: var(--ink-3); text-decoration: none; font-weight: 400; opacity: 0; transition: opacity 0.15s;
}
.headerlink::before { content: "#"; }
.article h2:hover .headerlink, .article h3:hover .headerlink, .article h4:hover .headerlink, .headerlink:focus { opacity: 1; }
.headerlink:hover { color: var(--accent); }

.article p { margin: 0 0 1.15em; }
.article ul, .article ol { margin: 0 0 1.15em; padding-left: 1.45em; }
.article li { margin: 0.3em 0; }
.article li > p { margin-bottom: 0.5em; }
.article li::marker { color: var(--ink-3); }
.article strong { color: var(--ink); font-weight: 650; }
.article hr { border: 0; border-top: 1px solid var(--rule); margin: 2.4em 0; }
.article a { text-decoration: underline; text-decoration-color: var(--accent-line); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.article a:hover { text-decoration-color: currentColor; }
.article a.headerlink { text-decoration: none; }

/* "(since C++11)" under a feature heading, as a tag */
.article p.since { margin: -0.25em 0 1.1em; line-height: 1; }
.since span {
  display: inline-block; padding: 5px 10px; border-radius: 999px;
  font: 600 12px/1 var(--font-mono); letter-spacing: 0;
  color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent-line);
}

.article blockquote {
  margin: 1.6em 0; padding: 14px 20px;
  background: var(--bg-2); border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0;
  color: var(--ink-2); font-size: 0.95em;
}
.article blockquote > :last-child { margin-bottom: 0; }

/* images and their captions */
.article p > img { display: block; max-width: 100%; height: auto; margin: 1.6em auto 0.4em; border-radius: 8px; }
.article img { max-width: 100%; height: auto; }
.image-caption { display: block; text-align: center; font-size: 13.5px; color: var(--ink-3); margin-bottom: 1.6em; }
/* A linked badge (the license mark) is not a figure: no caption from its alt. */
a > img + .image-caption { display: none; }

/* tables */
.table-wrap { margin: 1.6em 0; overflow-x: auto; border: 1px solid var(--rule); border-radius: 10px; }
.article table { width: 100%; border-collapse: collapse; font-size: 14.5px; line-height: 1.55; }
.article th, .article td { padding: 9px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--rule); }
.article th { background: var(--bg-2); color: var(--ink); font-weight: 600; white-space: nowrap; }
.article tr:last-child td { border-bottom: 0; }
.article th[align="center"], .article td[align="center"] { text-align: center; }
.article th[align="right"], .article td[align="right"] { text-align: right; }
.article td img { display: block; margin: 0 auto; max-width: 220px; }

/* ----------------------------------------------------------------- code */
code { font-family: var(--font-mono); }
:not(pre) > code {
  font-size: 0.86em; padding: 0.14em 0.4em; border-radius: 5px;
  background: var(--bg-2); box-shadow: inset 0 0 0 1px var(--rule);
  color: var(--ink);
}
a > code { color: inherit; }
.code { position: relative; margin: 1.5em 0; }
.code pre {
  margin: 0; padding: 18px 20px;
  background: var(--code-bg); border: 1px solid var(--rule); border-radius: 12px;
  overflow-x: auto; scrollbar-width: thin; scrollbar-color: var(--rule-2) transparent;
  font: 400 13.5px/1.7 var(--font-mono); color: var(--code-ink);
  tab-size: 4;
}
.code pre code { font: inherit; }
/* The language, in the corner; the copy button takes its place on hover. */
.code[data-lang]::before {
  content: attr(data-lang);
  position: absolute; top: 9px; right: 12px; z-index: 1;
  padding: 2px 6px; border-radius: 5px; background: var(--code-bg);
  font: 500 11px/1.4 var(--font-mono); color: var(--ink-3); letter-spacing: 0.02em;
  pointer-events: none; transition: opacity 0.15s;
}
.copy-btn {
  position: absolute; top: 7px; right: 8px; z-index: 2;
  padding: 4px 10px; border: 1px solid var(--rule-2); border-radius: 7px;
  background: var(--bg); color: var(--ink-2); cursor: pointer;
  font: 500 12px/1.3 var(--font-ui);
  opacity: 0; transition: opacity 0.15s, color 0.15s, border-color 0.15s;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent-line); }
.copy-btn.done { color: var(--hl-str); border-color: currentColor; opacity: 1; }
.code:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.code:hover::before { opacity: 0; }
@media (hover: none) {
  .copy-btn { opacity: 1; }
  .code[data-lang]::before { display: none; }
}

/* syntax (highlight.js classes, written at build time) */
.hljs-keyword, .hljs-meta .hljs-keyword, .hljs-selector-tag { color: var(--hl-kw); }
.hljs-type, .hljs-class .hljs-title, .hljs-title.class_ { color: var(--hl-type); }
.hljs-title, .hljs-title.function_, .hljs-built_in, .hljs-section { color: var(--hl-fn); }
.hljs-string, .hljs-meta .hljs-string, .hljs-regexp, .hljs-char { color: var(--hl-str); }
.hljs-number, .hljs-literal, .hljs-symbol { color: var(--hl-num); }
.hljs-comment, .hljs-quote { color: var(--hl-com); font-style: italic; }
.hljs-meta { color: var(--hl-meta); }
.hljs-variable, .hljs-template-variable, .hljs-attr { color: var(--hl-num); }
.hljs-params, .hljs-function { color: inherit; }
.hljs-doctag, .hljs-strong { font-weight: 600; }
.hljs-emphasis { font-style: italic; }

/* No ligatures: a reader learning C++ should see == and -> as typed. This
   comes after every rule that sets the font shorthand, which resets it. */
code, .code pre, .since span, .nav-num, .cg-num {
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "calt" 0;
}

/* ------------------------------------------------------ pager and footer */
.pager {
  max-width: var(--col); margin: 64px auto 0;
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
}
.pager a {
  display: flex; flex-direction: column; gap: 4px; min-width: 0;
  padding: 14px 18px; border: 1px solid var(--rule); border-radius: 12px;
  text-decoration: none; transition: border-color 0.15s, box-shadow 0.15s;
}
.pager a:hover { border-color: var(--accent-line); box-shadow: 0 6px 20px -10px rgba(60, 15, 20, 0.22); }
.pager-next { grid-column: 2; text-align: right; }
.pager-dir { font-size: 12.5px; font-weight: 500; color: var(--ink-3); }
.pager-title { font-size: 15px; font-weight: 600; color: var(--ink); line-height: 1.4; }
.pager a:hover .pager-title { color: var(--accent); }

.site-footer {
  max-width: var(--col); margin: 40px auto 0; padding: 20px 0 44px;
  border-top: 1px solid var(--rule);
  display: flex; flex-direction: column; gap: 4px;
  font-size: 13px; line-height: 1.6; color: var(--ink-3);
}
.site-footer a { color: var(--ink-2); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }
/* Page views and visitors, filled in by urlstat on the published site. */
.page-stat { font-variant-numeric: tabular-nums; }
.page-stat:has(#urlstat-page-pv:empty) { display: none; }

/* -------------------------------------------------------------- landing */
.hero {
  position: relative;
  background:
    radial-gradient(900px 420px at 88% -8%, rgba(126, 45, 54, 0.09), transparent 62%),
    radial-gradient(700px 360px at -10% 110%, rgba(126, 45, 54, 0.05), transparent 60%);
  border-bottom: 1px solid var(--rule);
}
.hero-inner {
  max-width: 1120px; margin: 0 auto; padding: 84px 32px 92px;
  display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr); gap: 72px; align-items: center;
}
.hero-eyebrow {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
  margin: 0 0 22px; font-size: 15px; font-weight: 500; color: var(--ink-2);
}
.hero-edition {
  padding: 4px 10px; border-radius: 999px;
  font-size: 11.5px; font-weight: 600; letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent-line);
}
.hero h1 {
  margin: 0; color: var(--ink);
  font-size: clamp(2.5rem, 5.4vw, 4rem); font-weight: 700; line-height: 1.04; letter-spacing: -0.04em;
}
.hero-tagline {
  margin: 16px 0 0; color: var(--accent);
  font-size: clamp(1.25rem, 2.3vw, 1.7rem); font-weight: 600; letter-spacing: -0.02em; line-height: 1.3;
}
.hero-blurb { max-width: 34em; margin: 24px 0 0; font-size: 17px; line-height: 1.7; color: var(--ink-2); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 46px; padding: 0 22px; border-radius: 10px;
  font-size: 15px; font-weight: 600; text-decoration: none; white-space: nowrap;
  transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 1px 2px rgba(126, 45, 54, 0.3), 0 8px 22px -8px rgba(126, 45, 54, 0.6);
}
.btn-primary:hover { background: var(--accent-ink); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: var(--bg); color: var(--ink); border: 1px solid var(--rule-2); }
.btn-ghost:hover { color: var(--accent); border-color: var(--accent-line); }
.hero-links { display: flex; flex-wrap: wrap; gap: 6px 20px; margin: 24px 0 0; font-size: 14px; }
.hero-links a { color: var(--ink-3); text-decoration: none; }
.hero-links a:hover { color: var(--accent); }
.hero-cover { display: flex; justify-content: flex-end; }
.hero-cover img {
  display: block; width: 100%; max-width: 330px; height: auto;
  border-radius: 4px 8px 8px 4px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.05), 0 2px 6px rgba(40, 10, 14, 0.08), 0 30px 60px -18px rgba(60, 15, 20, 0.45);
}

.contents { max-width: 1120px; margin: 0 auto; padding: 64px 32px 8px; }
.contents h2 {
  margin: 0 0 20px;
  font-size: 12.5px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3);
}
.chapter-grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px;
}
.chapter-grid a {
  display: flex; align-items: flex-start; gap: 16px; height: 100%;
  padding: 18px 20px; border: 1px solid var(--rule); border-radius: 12px;
  background: var(--bg); text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.chapter-grid a:hover {
  border-color: var(--accent-line); transform: translateY(-1px);
  box-shadow: 0 10px 26px -14px rgba(60, 15, 20, 0.3);
}
.cg-num { flex: none; min-width: 2ch; font: 600 20px/1.2 var(--font-mono); color: var(--accent); }
.cg-text { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.cg-label { font-size: 12px; font-weight: 500; color: var(--ink-3); }
.cg-name { font-size: 15.5px; font-weight: 600; line-height: 1.4; color: var(--ink); }
.chapter-grid a:hover .cg-name { color: var(--accent); }
.landing-footer { max-width: 1120px; margin: 0 auto; padding: 0 32px; }
.landing-footer .site-footer { max-width: none; margin-top: 56px; }

/* ------------------------------------------------------- Chinese edition */
/* Chinese has no italic, so emphasis is set in weight; it also reads better
   with more leading and no tightened tracking. */
html[lang^="zh"] .article { line-height: 1.85; }
html[lang^="zh"] .article em { font-style: normal; font-weight: 600; color: var(--ink); }
html[lang^="zh"] .article h1, html[lang^="zh"] .article h2, html[lang^="zh"] .article h3,
html[lang^="zh"] .hero h1, html[lang^="zh"] .hero-tagline { letter-spacing: 0; }
html[lang^="zh"] .hero h1 { line-height: 1.15; }
html[lang^="zh"] .chapter-num, html[lang^="zh"] .hero-edition { letter-spacing: 0.04em; }

/* ----------------------------------------------------------- responsive */
.scrim { display: none; }
@media (max-width: 1240px) {
  .layout { grid-template-columns: var(--side) minmax(0, 1fr); }
  .outline { display: none; }
}
@media (max-width: 960px) {
  .layout, .layout.no-outline { grid-template-columns: minmax(0, 1fr); }
  .main { grid-column: 1; padding: 0 24px; }
  .menu-btn { display: grid; }
  .sidebar {
    left: 0; width: min(300px, 86vw); z-index: 50;
    border-right: 0; box-shadow: 10px 0 40px rgba(0, 0, 0, 0.12);
    transform: translateX(-105%); visibility: hidden;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), visibility 0s linear 0.25s;
  }
  .nav-open .sidebar { transform: none; visibility: visible; transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1); }
  .scrim {
    display: block; position: fixed; inset: var(--top) 0 0 0; z-index: 45;
    background: rgba(20, 10, 12, 0.28); opacity: 0; pointer-events: none; transition: opacity 0.25s;
  }
  .nav-open .scrim { opacity: 1; pointer-events: auto; }
  .nav-open body { overflow: hidden; }

  .hero-inner { grid-template-columns: minmax(0, 1fr); gap: 36px; padding: 48px 24px 56px; }
  .hero-cover { order: -1; justify-content: flex-start; }
  .hero-cover img { max-width: 168px; }
  .contents, .landing-footer { padding-left: 24px; padding-right: 24px; }
}
@media (max-width: 720px) {
  .crumbs { visibility: hidden; }
}
@media (max-width: 600px) {
  :root { --top: 52px; }
  .topbar { padding: 0 8px 0 16px; gap: 8px; }
  .tool-text span { display: none; }
  .main { padding: 0 18px; }
  .article { padding-top: 32px; font-size: 16px; }
  .article h1 { font-size: 1.8rem; }
  .article h2 { font-size: 1.32rem; }
  .article h3 { font-size: 1.1rem; }
  .headerlink { display: none; }
  .code { margin-left: -18px; margin-right: -18px; }
  .code pre { border-radius: 0; border-left: 0; border-right: 0; padding: 16px 18px; font-size: 13px; }
  .pager { grid-template-columns: minmax(0, 1fr); }
  .pager-next { grid-column: 1; }
  .hero-inner { padding: 36px 18px 44px; }
  .hero-actions .btn { flex: 1 1 auto; justify-content: center; }
  .contents, .landing-footer { padding-left: 18px; padding-right: 18px; }
  .chapter-grid { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .chapter-grid a { padding: 14px 16px; }
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}
@media print {
  .topbar, .sidebar, .outline, .pager, .scrim, .copy-btn { display: none !important; }
  body { padding-top: 0; }
  .layout { display: block; }
  .main { padding: 0; }
}