/* Paper and ink, with comic expression reserved for the brand and home hero. */
@import url('https://fonts.googleapis.com/css2?family=Bangers&family=Geist:wght@400;500;600;700;800&display=swap');
:root {
  --bg: #f6f5f1;
  --card: #f6f5f1;
  --bg-soft: #eeede7;
  --text: #252722;
  --muted: #60635b;
  --border: #d3d3c9;
  --accent: #116b5f;
  --accent-hover: #0b5148;
  --sans: Geist, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --display: Bangers, Impact, "Arial Narrow", sans-serif;
  --display-weight: 400;
  --display-spacing: .025em;
  --r: 6px;
  --maxw: 1120px;
}
/* CJK shares the layout and rhythm, not a forced Latin display face. */
:root:lang(zh) { --display: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif; --display-weight: 800; --display-spacing: 0; }
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 92px; -webkit-text-size-adjust: 100%; }
body { background: var(--bg); color: var(--text); font: 17px/1.7 var(--sans); -webkit-font-smoothing: antialiased; }
button { font: inherit; cursor: pointer; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; text-underline-offset: 4px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
[hidden] { display: none !important; }
::selection { background: #d0e7df; }
.wrap { width: 100%; max-width: var(--maxw); margin: auto; padding: 0 32px; }
.mono, code, .keys { font-family: var(--mono); }
code { font-size: .85em; background: var(--bg-soft); border-radius: 4px; padding: 2px 5px; overflow-wrap: anywhere; }
.kicker { display: block; color: var(--muted); font-size: 11px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
/* Quiet, consistent navigation in both languages. */
nav { position: sticky; top: 0; z-index: 50; background: var(--bg); border-bottom: 1px solid var(--border); }
nav .wrap { height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { display: inline-block; font-family: Bangers, Impact, sans-serif; font-size: 38px; font-weight: 400; letter-spacing: .04em; line-height: 1; transform: rotate(-3deg); }
.logo a { color: var(--bg); -webkit-text-stroke: 1px var(--text); text-shadow: 2px 2px 0 var(--text); text-decoration: none; }
.logo .spark { color: var(--accent); margin-left: 8px; font: 700 16px var(--sans); -webkit-text-stroke: 0; text-shadow: none; vertical-align: 7px; }
.nav-links { display: flex; align-items: center; gap: 14px; font: 500 14px/1.4 var(--sans); }
.nav-links > a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 6px; color: var(--text); white-space: nowrap; border-bottom: 2px solid transparent; }
.nav-links > a:hover, .nav-links > a[aria-current="page"] { color: var(--accent); border-bottom-color: var(--accent); text-decoration: none; }
.nav-sep { width: 1px; height: 20px; background: var(--border); }
.nav-links > .nav-cta { padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--r); }
.nav-links > .nav-cta:hover { background: var(--bg-soft); border-color: var(--accent); }
.nav-toggle { display: none; border: 1px solid var(--border); background: transparent; color: var(--text); border-radius: var(--r); min-width: 64px; height: 44px; padding: 0 12px; font: 500 14px var(--sans); }
.nav-toggle[aria-expanded="true"] { background: var(--bg-soft); color: var(--accent); }
.lang-switch { position: relative; display: inline-flex; }
.lang-btn { display: flex; align-items: center; justify-content: center; gap: 6px; background: transparent; border: 1px solid transparent; border-radius: var(--r); min-width: 44px; min-height: 44px; padding: 8px; color: var(--muted); font: 500 13px/1.4 var(--sans); }
.lang-btn:hover, .lang-btn[aria-expanded="true"] { background: var(--bg-soft); color: var(--accent); }
.lang-menu { display: none; position: absolute; top: calc(100% + 6px); right: 0; min-width: 120px; padding: 6px; background: var(--card); border: 1px solid var(--border); border-radius: var(--r); box-shadow: 0 6px 18px #2527220d; }
.lang-menu.open { display: block; }
.lang-menu a { display: flex; align-items: center; min-height: 44px; padding: 8px 10px; color: var(--text); font: 500 14px/1.4 var(--sans); }
.lang-menu a:hover, .lang-menu a[aria-current="page"] { background: var(--bg-soft); color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }
/* The hero carries the display voice; supporting copy stays readable. */
.hero { padding: 56px 0 64px; }
.hero-layout { display: grid; grid-template-columns: 1.25fr 1fr; gap: 48px; align-items: center; }
h1, h2, h3 { font-family: var(--sans); font-weight: 600; letter-spacing: -.025em; line-height: 1.25; text-wrap: balance; overflow-wrap: break-word; }
.hero-head { border-left: 3px solid var(--text); padding: 0 0 8px 24px; min-width: 0; }
.hero h1 { font-family: var(--display); font-weight: var(--display-weight); letter-spacing: var(--display-spacing); line-height: 1.12; font-size: clamp(48px, 5.4vw, 72px); margin-top: 20px; }
.hero h1:lang(zh) { font-size: clamp(34px, 3.6vw, 48px); line-height: 1.25; }
.hero-head > .kicker { color: var(--accent); }
em { font-style: normal; }
.hero h1 em { color: var(--accent); }
.hero .sub { max-width: 540px; margin-top: 22px; color: var(--muted); font-size: 17px; line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 20px; margin-top: 28px; }
.btn { display: inline-flex; justify-content: center; align-items: center; min-height: 44px; font-size: 14px; font-weight: 500; padding: 11px 18px; border: 1px solid var(--border); border-radius: var(--r); }
.btn:hover { background: var(--bg-soft); border-color: var(--accent); text-decoration: none; }
.btn-primary { color: var(--accent); }
.hero .btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.hero .btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-ghost { background: transparent; color: var(--text); }
.text-link { font-size: 14px; color: var(--muted); }
.install-heading { margin-bottom: 10px; color: var(--muted); font-size: 13px; font-weight: 500; }
.install { border: 1px solid var(--border); border-radius: var(--r); background: var(--card); overflow: hidden; min-width: 0; }
.install-tabs { display: flex; padding: 0 12px; gap: 16px; border-bottom: 1px solid var(--border); overflow-x: auto; }
.install-tab { flex-shrink: 0; background: none; border: 0; border-bottom: 2px solid transparent; min-height: 44px; padding: 13px 0; font-size: 13px; color: var(--muted); }
.install-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.install-body, .cmd { display: flex; align-items: center; gap: 12px; padding: 18px; min-width: 0; }
.install-body code, .cmd code { flex: 1; min-width: 0; background: none; padding: 0; font-size: 13px; white-space: pre-wrap; overflow-wrap: anywhere; }
.prompt { color: var(--accent); font-family: var(--mono); font-size: 13px; }
.copy-btn { flex-shrink: 0; background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 5px; min-width: 44px; min-height: 44px; padding: 5px 9px; font-size: 12px; }
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.install-note { margin-top: 14px; color: var(--muted); font-size: 13px; }
.install-note a { text-decoration: underline; text-underline-offset: 3px; }
/* The original intro retains its exact paper palette and artwork. */
.intro-section { padding-top: 0; border-bottom: 1px solid var(--border); }
.intro-section .section-head { max-width: none; border-top: 1px solid var(--border); padding-top: 24px; }
.intro-section .section-title { font-size: 24px; margin-top: 8px; }
.intro-section .section-sub { margin-top: 8px; font-size: 15px; }
.intro-player { position: relative; aspect-ratio: 16 / 9; margin-top: 12px; overflow: hidden; background: var(--bg); }
.intro-poster { object-fit: contain; }
.intro-poster, .intro-player iframe { display: block; width: 100%; height: 100%; border: 0; }
.intro-player iframe { position: absolute; inset: 0; background: var(--bg); }
.intro-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 20px; margin-top: 20px; }
.intro-status { font-size: 13px; color: var(--muted); }
/* Editorial sections: fine rules and numbered accents, not boxed panels. */
section { padding: 72px 0; }
.section-head { max-width: 760px; }
.section-title { font-size: clamp(28px, 3vw, 36px); margin-top: 12px; }
.section-title:lang(zh) { font-size: clamp(26px, 2.8vw, 32px); line-height: 1.35; }
.section-sub { color: var(--muted); margin-top: 16px; }
.trigram { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 40px; margin-top: 36px; }
.stroke { border-top: 1px solid var(--border); padding: 24px 0 8px; min-width: 0; }
.rail { display: flex; gap: 12px; align-items: center; margin-bottom: 16px; font-size: 11px; text-transform: uppercase; letter-spacing: .06em; }
.glyph { color: var(--accent); font: 26px/1 Bangers, sans-serif; letter-spacing: .04em; }
.name { font-weight: 500; color: var(--muted); }
.stroke h3 { font-size: 22px; }
.stroke p { color: var(--muted); margin-top: 12px; font-size: 15px; line-height: 1.7; }
.stroke .more, .more { font-size: 14px; margin-top: 18px; }
.keys { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 16px; font-size: 12px; color: var(--muted); }
.band { background: var(--bg-soft); border-block: 1px solid var(--border); }
.bench-wrap { margin-top: 32px; overflow-x: auto; border-block: 1px solid var(--border); background: var(--card); }
table { width: 100%; border-collapse: collapse; font-size: 14px; font-variant-numeric: tabular-nums; }
th, td { padding: 15px 20px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { font-size: 12px; font-weight: 500; color: var(--muted); background: var(--bg-soft); }
tr:last-child td { border-bottom: 0; }
td.adv { color: var(--muted); }
tbody tr:first-child td.adv, tbody tr:last-child td.adv { color: var(--accent); }
.bench-note { max-width: 850px; color: var(--muted); font-size: 13px; margin-top: 18px; }
.community-row { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 32px; }
.community-card { border-top: 1px solid var(--border); padding-top: 24px; }
.community-card h3 { font-size: 21px; }
.community-copy { margin-top: 12px; font-size: 15px; color: var(--muted); }
footer { border-top: 1px solid var(--border); padding: 28px 0; font-size: 13px; color: var(--muted); }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
footer a { color: var(--muted); }
/* Guides share the brand, with a straightforward reading hierarchy. */
.page-hero { padding: 48px 0 8px; }
.page-hero .wrap { padding-bottom: 28px; }
.page-hero h1 { font-size: clamp(34px, 4vw, 46px); margin-top: 16px; }
.page-hero p { margin-top: 16px; max-width: 620px; color: var(--muted); font-size: 17px; }
.steps { max-width: 900px; margin: 32px 0 0; }
.step { display: flex; gap: 24px; padding: 28px 0; margin-bottom: 16px; border-top: 1px solid var(--border); }
.step .num { color: var(--muted); font: 500 16px/32px var(--sans); text-align: center; width: 32px; height: 32px; flex-shrink: 0; }
.step-body { flex: 1; min-width: 0; }
.step-body h2 { font-size: 24px; }
.step-body > p { margin-top: 12px; color: var(--muted); }
.cmd { border: 1px solid var(--border); border-radius: var(--r); background: var(--card); margin-top: 14px; }
.substeps { padding-left: 22px; margin-top: 18px; color: var(--muted); }
.substeps li { padding: 5px 0 5px 6px; }
.substeps b { font-weight: 600; color: var(--text); }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 40px; margin-top: 32px; counter-reset: chapter; }
.card { border-top: 1px solid var(--border); padding: 24px 0; min-width: 0; }
.card h2 { font-size: 22px; display: flex; align-items: baseline; gap: 14px; }
.doc-card h2::before { counter-increment: chapter; content: counter(chapter, decimal-leading-zero); color: var(--muted); font: 500 13px/1 var(--sans); }
.doc-card ul { list-style: none; margin-top: 18px; }
.doc-card li { margin-top: 8px; font-size: 16px; }
.doc-card li a { color: var(--muted); }
.doc-card li a:hover { color: var(--accent); }
.cta-box { background: var(--bg-soft); border-radius: var(--r); padding: 32px; }
.cta-box h2 { font-size: 26px; }
.cta-box p { margin-top: 12px; color: var(--muted); }
@media (max-width: 960px) {
  .hero-layout { grid-template-columns: 1fr; gap: 36px; }
  .hero-install { max-width: 600px; width: 100%; }
  .nav-links { gap: 8px; }
}
@media (max-width: 900px) {
  nav .wrap { height: 64px; }
  .nav-toggle { display: block; }
  .nav-links { display: none; position: absolute; top: 64px; left: 16px; right: 16px; background: var(--bg); padding: 16px; border: 1px solid var(--border); border-radius: var(--r); box-shadow: 0 6px 18px #2527220d; align-items: stretch; max-height: calc(100dvh - 88px); overflow-y: auto; }
  nav.open .nav-links { display: flex; flex-direction: column; gap: 8px; }
  .nav-links > a { padding: 8px 12px; }
  .nav-sep { width: 100%; height: 1px; flex-shrink: 0; margin: 4px 0; }
  .lang-switch { display: flex; flex-wrap: wrap; gap: 10px; }
  .lang-menu { position: static; min-width: 0; box-shadow: none; }
  .lang-menu.open { display: flex; }
}
@media (max-width: 760px) {
  .wrap { padding: 0 22px; }
  .hero { padding: 36px 0 44px; }
  .hero-head { padding-left: 16px; }
  .hero h1 { font-size: clamp(42px, 8.5vw, 60px); }
  .hero h1:lang(zh) { font-size: clamp(30px, 6.5vw, 44px); }
  section { padding: 48px 0; }
  .grid, .community-row, .trigram { grid-template-columns: 1fr; gap: 24px; }
  .page-hero { padding-top: 36px; }
  .step { gap: 12px; }
  .cmd { flex-wrap: wrap; padding: 12px; }
  .cmd code { flex-basis: 75%; }
  .cta-box { padding: 24px; }
  .install-tabs { gap: 18px; }
  th, td { padding: 12px 16px; }
}
/* Functional content remains available if scripts fail or are disabled. */
html:not(.js) .nav-toggle, html:not(.js) .lang-btn,
html:not(.js) .install-tabs, html:not(.js) .copy-btn { display: none; }
html:not(.js) .lang-menu { display: flex; position: static; border: 0; padding: 0; box-shadow: none; }
html:not(.js) nav { position: static; }
html:not(.js) nav .wrap { height: auto; min-height: 72px; flex-wrap: wrap; padding-block: 12px; }
html:not(.js) .nav-links { display: flex; position: static; flex-wrap: wrap; max-height: none; overflow: visible; border: 0; box-shadow: none; padding: 0; }
.skip-link { position: fixed; top: 8px; left: 16px; z-index: 100; padding: 10px 16px; background: var(--bg); border: 1px solid var(--accent); transform: translateY(-200%); }
.skip-link:focus { transform: none; }
.intro-caption { margin-top: 16px; max-width: 760px; font-size: 16px; line-height: 1.6; color: var(--muted); }
.install-tab:focus-visible { outline-offset: -3px; }
.intro-actions .text-link { display: inline-flex; align-items: center; min-height: 44px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }