:root {
  --paper: oklch(95.5% 0.018 87);
  --paper-light: oklch(98% 0.012 87);
  --paper-deep: oklch(91.5% 0.025 82);
  --ink: oklch(22% 0.035 238);
  --ink-soft: oklch(40% 0.028 238);
  --ink-muted: oklch(53% 0.02 238);
  --signal: oklch(57% 0.18 32);
  --signal-dark: oklch(49% 0.17 31);
  --signal-soft: oklch(88% 0.06 45);
  --line: oklch(77% 0.025 82);
  --line-dark: oklch(39% 0.025 238);
  --safe: oklch(63% 0.13 148);
  --display: "Avenir Next Condensed", "DIN Condensed", "DIN Alternate", sans-serif;
  --body: "Avenir Next", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei UI", sans-serif;
  --serif: "Songti SC", "Noto Serif CJK SC", STSong, serif;
  --container: 1180px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(oklch(42% 0.025 82 / 0.035) 1px, transparent 1px),
    linear-gradient(90deg, oklch(42% 0.025 82 / 0.035) 1px, transparent 1px);
  background-size: 24px 24px;
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.65;
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }
code {
  font-family: "SFMono-Regular", "Cascadia Code", Consolas, monospace;
  font-variant-ligatures: none;
}

.container {
  width: min(calc(100% - clamp(2rem, 6vw, 6rem)), var(--container));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 500;
  padding: 10px 16px;
  color: var(--paper-light);
  background: var(--ink);
  transform: translateY(-160%);
  transition: transform 180ms var(--ease-out);
}

.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  background: var(--paper);
}

.nav-row {
  min-height: 76px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 4rem);
}

.brand {
  width: max-content;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  line-height: 1.1;
}

.brand img { flex: 0 0 auto; }
.brand span { display: grid; gap: 4px; }
.brand strong {
  font-family: var(--display);
  font-size: .84rem;
  font-weight: 750;
  letter-spacing: .12em;
}
.brand small { color: var(--ink-soft); font-size: .68rem; letter-spacing: .08em; }

nav { display: flex; align-items: center; gap: clamp(1.25rem, 3vw, 2.5rem); }
nav a {
  position: relative;
  padding-block: 26px;
  color: var(--ink-soft);
  font-size: .78rem;
  font-weight: 650;
  letter-spacing: .05em;
}
nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 18px;
  left: 0;
  height: 2px;
  background: var(--signal);
  opacity: 0;
  transform: scaleX(.35);
  transition: opacity 180ms, transform 220ms var(--ease-out);
}
nav a:hover::after { opacity: 1; transform: none; }
nav a[aria-current="page"] { color: var(--ink); }
nav a[aria-current="page"]::after { opacity: 1; transform: none; }
nav a span { margin-right: 4px; color: var(--signal); font-family: var(--display); font-size: .68rem; }

.header-download {
  justify-self: end;
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  color: var(--paper-light);
  background: var(--ink);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .04em;
  transition: color 140ms, background 140ms, transform 140ms;
}
.header-download:hover { background: var(--signal); }
.header-download:active { transform: translateY(1px); }

.icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(3.5rem, 8vw, 7.5rem) 0 0;
  border-bottom: 1px solid var(--ink);
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: max(20px, calc((100vw - min(calc(100vw - clamp(2rem, 6vw, 6rem)), var(--container))) / 2 - 24px));
  width: 8px;
  border-inline: 1px solid var(--line);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, .85fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 8rem);
}

.hero-copy { max-width: 700px; --i: 0; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
  color: var(--signal-dark);
  font-family: var(--display);
  font-size: .72rem;
  font-weight: 750;
  letter-spacing: .17em;
}
.eyebrow::before { content: ""; width: 34px; height: 3px; background: var(--signal); }
.eyebrow span + span { color: var(--ink-muted); }

h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { margin: 0; line-height: .88; }
.hero-title-en {
  display: block;
  margin-left: -.045em;
  font-family: var(--display);
  font-size: clamp(4.2rem, 9.4vw, 8rem);
  font-weight: 800;
  letter-spacing: -.055em;
}
.hero-title-zh {
  display: block;
  margin-top: clamp(1.25rem, 2.8vw, 2rem);
  font-family: var(--serif);
  font-size: clamp(2rem, 4.6vw, 4rem);
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1.1;
}

.summary {
  max-width: 35rem;
  margin: 26px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.4vw, 1.14rem);
  line-height: 1.8;
}

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 21px;
  border: 1px solid var(--ink);
  font-size: .87rem;
  font-weight: 700;
  letter-spacing: .025em;
  transition: color 160ms, background 160ms, border-color 160ms, transform 160ms var(--ease-out);
}
.button:hover { transform: translateY(-2px); }
.button:active { transform: translateY(1px); }
.button-primary { color: var(--paper-light); border-color: var(--signal); background: var(--signal); }
.button-primary:hover { border-color: var(--signal-dark); background: var(--signal-dark); }
.button-secondary { color: var(--ink); background: transparent; }
.button-secondary:hover { color: var(--paper-light); background: var(--ink); }

.hero-disclaimer {
  margin: 18px 0 0;
  color: var(--ink-muted);
  font-size: .72rem;
  letter-spacing: .08em;
}

.route-board {
  --i: 1;
  position: relative;
  color: var(--paper-light);
  border: 1px solid var(--ink);
  background: var(--ink);
  box-shadow: 14px 14px 0 var(--signal-soft);
}
.route-board::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--line-dark);
  pointer-events: none;
}
.route-board-head {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 24px;
  border-bottom: 1px solid var(--line-dark);
  text-align: center;
}
.route-board-head div { display: grid; gap: 1px; }
.route-board-head small { color: var(--paper-deep); font-family: var(--display); font-size: .6rem; letter-spacing: .15em; }
.route-board-head strong { font-family: var(--serif); font-size: 1.05rem; letter-spacing: .1em; }
.route-code {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid var(--paper-deep);
  border-radius: 50%;
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 800;
}
.route-code-accent { color: var(--paper-light); border-color: var(--signal); background: var(--signal); }

.route-version {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: end;
  justify-content: space-between;
  padding: 34px 28px 16px;
}
.route-version > span { font-family: var(--display); font-size: clamp(3.5rem, 6vw, 5.5rem); font-weight: 800; letter-spacing: -.05em; line-height: 1; }
.route-version small { padding-bottom: 7px; color: var(--paper-deep); font-family: var(--serif); letter-spacing: .08em; }

.route-line { position: relative; z-index: 1; display: flex; justify-content: space-between; margin: 8px 32px 26px; }
.route-line::before { content: ""; position: absolute; top: 50%; right: 0; left: 0; height: 2px; background: var(--signal); transform: translateY(-50%); }
.route-line span { position: relative; width: 13px; height: 13px; border: 3px solid var(--signal); border-radius: 50%; background: var(--ink); }
.route-line span:first-child, .route-line span:last-child { background: var(--signal); }

.route-facts { position: relative; z-index: 1; margin: 0; padding: 0 28px; }
.route-facts div { display: flex; justify-content: space-between; gap: 18px; padding: 11px 0; border-top: 1px solid var(--line-dark); }
.route-facts dt { color: var(--paper-deep); font-size: .72rem; }
.route-facts dd { margin: 0; font-family: var(--display); font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-align: right; }
.route-facts a:hover { color: var(--signal-soft); }
.board-link { position: relative; z-index: 1; display: flex; justify-content: space-between; margin: 22px 8px 8px; padding: 16px 20px; color: var(--paper-light); background: var(--signal); font-size: .78rem; font-weight: 700; }
.board-link:hover { background: var(--signal-dark); }

.hero-marquee {
  margin-top: clamp(4rem, 8vw, 7rem);
  overflow: hidden;
  color: var(--paper-light);
  border-block: 1px solid var(--ink);
  background: var(--signal);
  font-family: var(--display);
  font-size: clamp(.78rem, 1.2vw, 1rem);
  font-weight: 750;
  letter-spacing: .13em;
  white-space: nowrap;
}
.marquee-track {
  width: max-content;
  display: flex;
  animation: train-pass 28s linear infinite;
  will-change: transform;
}
.marquee-copy { flex: none; padding: 11px 1.25rem 10px 0; }
.marquee-copy span { margin-inline: .35rem; font-family: var(--serif); }
.hero-marquee:hover .marquee-track { animation-play-state: paused; }

@keyframes train-pass {
  to { transform: translateX(-50%); }
}

.hero-meta { --i: 2; display: grid; grid-template-columns: repeat(4, 1fr); border-inline: 1px solid var(--ink); }
.hero-meta > div { min-width: 0; display: grid; grid-template-columns: auto 1fr; gap: 0 14px; padding: 22px clamp(14px, 2.2vw, 28px); border-right: 1px solid var(--ink); }
.hero-meta > div:last-child { border-right: 0; }
.hero-meta span { grid-row: 1 / 3; color: var(--signal); font-family: var(--display); font-size: .7rem; font-weight: 800; }
.hero-meta strong { font-size: .82rem; }
.hero-meta small { color: var(--ink-muted); font-size: .68rem; }

.section { padding: clamp(5rem, 10vw, 9rem) 0; }
.section-heading { display: grid; grid-template-columns: minmax(130px, .45fr) minmax(0, 1.55fr); gap: clamp(2rem, 7vw, 7rem); align-items: start; margin-bottom: clamp(2.5rem, 5vw, 5rem); }
.section-index { margin: 0; color: var(--signal-dark); font-family: var(--display); font-size: .72rem; font-weight: 800; letter-spacing: .16em; }
.section-heading h2, .install-lead h2, .faq-lead h2, .verification-layout h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.15rem, 4.6vw, 4.25rem);
  line-height: 1.22;
  letter-spacing: .025em;
}
.section-heading > div > p { max-width: 34rem; margin: 20px 0 0; color: var(--ink-soft); }

.preview-section .container { container: preview / inline-size; }
.preview { position: relative; margin: 0; padding: clamp(12px, 2vw, 22px); color: var(--paper-light); border: 1px solid var(--ink); background: var(--ink); box-shadow: 18px 18px 0 var(--paper-deep); }
.preview::before { content: ""; position: absolute; top: -7px; left: 10%; width: 25%; height: 7px; background: var(--signal); }
.preview-rail { display: flex; justify-content: space-between; padding: 0 2px 13px; color: var(--paper-deep); font-family: var(--display); font-size: .64rem; font-weight: 700; letter-spacing: .16em; }
.preview picture { display: block; }
.preview img { width: 100%; height: auto; border: 1px solid var(--line-dark); }
.preview figcaption { display: flex; justify-content: space-between; gap: 18px; padding: 16px 2px 0; font-size: .72rem; }
.preview figcaption span { color: var(--paper-deep); font-family: var(--display); letter-spacing: .08em; }

.coverage-list { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: clamp(2.5rem, 5vw, 4.5rem); border-top: 1px solid var(--ink); }
.coverage-list div { display: grid; gap: 9px; padding: 22px 18px 0 0; }
.coverage-list span { color: var(--signal-dark); font-family: var(--display); font-size: .68rem; font-weight: 800; letter-spacing: .12em; }
.coverage-list strong { font-family: var(--serif); font-size: clamp(1rem, 2vw, 1.25rem); }

.install-section { color: var(--paper-light); background: var(--ink); }
.install-layout { display: grid; grid-template-columns: minmax(280px, .75fr) minmax(0, 1.25fr); gap: clamp(4rem, 10vw, 10rem); align-items: start; }
.install-lead { position: sticky; top: 116px; }
.install-lead .section-index { color: var(--signal-soft); }
.install-lead h2 { margin-top: 18px; }
.install-lead > p:not(.section-index) { max-width: 28rem; margin: 22px 0 0; color: var(--paper-deep); }

.download-ticket { container: ticket / inline-size; max-width: 520px; margin-top: 42px; padding: 24px; color: var(--ink); border-top: 5px solid var(--signal); background: var(--paper-light); }
.ticket-label { display: flex; align-items: end; justify-content: space-between; gap: 12px; padding-bottom: 16px; border-bottom: 1px dashed var(--line); }
.ticket-label span { color: var(--signal-dark); font-family: var(--display); font-size: .6rem; font-weight: 800; letter-spacing: .14em; }
.ticket-label strong { font-family: var(--serif); }
.ticket-file { display: grid; gap: 4px; margin: 18px 0; }
.ticket-file strong { min-width: 0; font-size: .8rem; overflow-wrap: anywhere; }
.ticket-file > span { color: var(--ink-muted); font-family: var(--display); font-size: .68rem; letter-spacing: .08em; }
.button-ticket { width: 100%; color: var(--paper-light); border-color: var(--signal); background: var(--signal); }
.button-ticket:hover { background: var(--signal-dark); }

.install-steps { margin: 0; padding: 0; list-style: none; counter-reset: install; }
.install-steps li { position: relative; display: grid; grid-template-columns: 62px 1fr; gap: 22px; padding-bottom: 48px; counter-increment: install; }
.install-steps li::before { content: counter(install, decimal-leading-zero); position: relative; z-index: 1; width: 54px; height: 54px; display: grid; place-items: center; color: var(--paper-light); border: 2px solid var(--signal); border-radius: 50%; background: var(--ink); font-family: var(--display); font-weight: 800; }
.install-steps li:not(:last-child)::after { content: ""; position: absolute; top: 54px; bottom: 0; left: 26px; width: 2px; background: var(--signal); }
.install-steps li > div { padding-top: 8px; }
.install-steps strong { display: block; margin: 0 0 9px; font-family: var(--serif); font-size: clamp(1.15rem, 2vw, 1.45rem); }
.install-steps p { margin: 0; color: var(--paper-deep); }
.install-section code { padding: 2px 5px; color: var(--paper-light); border: 1px solid var(--line-dark); background: oklch(27% 0.035 238); font-size: .84em; }

.compatibility-note { display: grid; grid-template-columns: auto 1fr; gap: 15px; margin-top: 5px; padding: 20px; border-block: 1px solid var(--line-dark); }
.status-dot { width: 10px; height: 10px; margin-top: 7px; border-radius: 50%; background: var(--safe); box-shadow: 0 0 0 5px oklch(63% 0.13 148 / .12); }
.compatibility-note p { margin: 0; color: var(--paper-deep); font-size: .82rem; }
.compatibility-note strong { display: block; margin-bottom: 3px; color: var(--paper-light); }

.maintenance-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 50px; }
.maintenance-grid article { border-top: 3px solid var(--signal); padding-top: 18px; }
.maintenance-grid article > span { color: var(--signal-soft); font-family: var(--display); font-size: .64rem; font-weight: 800; letter-spacing: .14em; }
.maintenance-grid h3 { margin: 5px 0 10px; font-family: var(--serif); font-size: 1.2rem; }
.maintenance-grid p { margin: 0; color: var(--paper-deep); font-size: .83rem; }
.maintenance-grid code { overflow-wrap: anywhere; }
.section-deep-link { display: flex; justify-content: space-between; gap: 18px; margin-top: 34px; padding: 16px 0; color: var(--signal-soft); border-block: 1px solid var(--line-dark); font-size: .78rem; font-weight: 700; }
.section-deep-link:hover { color: var(--paper-light); }

.verification-section { padding: clamp(3.5rem, 7vw, 6rem) 0; border-bottom: 1px solid var(--ink); background: var(--signal-soft); }
.verification-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(3rem, 8vw, 8rem); align-items: end; }
.verification-layout h2 { max-width: 10em; margin-top: 14px; font-size: clamp(1.7rem, 3vw, 2.6rem); }
.verification-layout > div > p:last-child { margin: 14px 0 0; color: var(--ink-soft); font-size: .86rem; }
.checksum { min-width: 0; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px; align-items: center; padding: 18px 0; border-block: 1px solid var(--ink); }
.checksum > div { min-width: 0; display: grid; gap: 5px; }
.checksum span { color: var(--signal-dark); font-family: var(--display); font-size: .65rem; font-weight: 800; letter-spacing: .13em; }
.checksum code { overflow: hidden; color: var(--ink-soft); font-size: .72rem; text-overflow: ellipsis; white-space: nowrap; }
.checksum button { min-height: 44px; padding: 0 14px; color: var(--paper-light); border: 1px solid var(--ink); background: var(--ink); cursor: pointer; font-size: .72rem; font-weight: 700; transition: background 140ms, border-color 140ms, transform 140ms; }
.checksum button:hover { border-color: var(--signal); background: var(--signal); }
.checksum button:active { transform: translateY(1px); }

.faq-layout { display: grid; grid-template-columns: minmax(240px, .7fr) minmax(0, 1.3fr); gap: clamp(4rem, 10vw, 10rem); align-items: start; }
.faq-lead h2 { margin-top: 18px; }
.faq-lead > p:not(.section-index) { margin: 18px 0 0; color: var(--ink-soft); }
.faq-lead > a { display: inline-block; margin-top: 30px; color: var(--signal-dark); border-bottom: 1px solid currentColor; font-size: .8rem; font-weight: 700; }
.faq-lead > a:hover { color: var(--ink); }
.faq-list { border-top: 1px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--ink); }
.faq-list summary { position: relative; padding: 24px 50px 24px 0; cursor: pointer; font-family: var(--serif); font-size: clamp(1rem, 1.8vw, 1.25rem); font-weight: 700; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "＋"; position: absolute; top: 22px; right: 2px; color: var(--signal); font-family: var(--body); font-size: 1.35rem; font-weight: 400; transition: transform 220ms var(--ease-out); }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list details p { max-width: 44rem; margin: -4px 0 25px; padding-right: 48px; color: var(--ink-soft); font-size: .9rem; }
.faq-list details p a { color: var(--signal-dark); border-bottom: 1px solid currentColor; }

.content-page { background: var(--paper); }
.subpage-hero { padding: clamp(3rem, 7vw, 6rem) 0 clamp(4rem, 8vw, 7rem); border-bottom: 1px solid var(--ink); }
.subpage-hero .section-index { margin-top: clamp(2.5rem, 5vw, 4.5rem); }
.subpage-hero h1 { max-width: 950px; margin: 20px 0 0 -.04em; font-family: var(--serif); font-size: clamp(3rem, 7.5vw, 6.8rem); font-weight: 700; letter-spacing: -.035em; line-height: 1.05; }
.subpage-lead { max-width: 46rem; margin: 28px 0 0; color: var(--ink-soft); font-size: clamp(1rem, 1.5vw, 1.15rem); line-height: 1.8; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; color: var(--ink-muted); list-style: none; font-size: .72rem; }
.breadcrumbs li + li::before { content: "/"; margin-right: 8px; color: var(--line-dark); }
.breadcrumbs a:hover { color: var(--signal-dark); }
.subpage-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); max-width: 780px; margin: 45px 0 0; border-block: 1px solid var(--ink); }
.subpage-facts div { display: grid; gap: 5px; padding: 17px 24px 17px 0; }
.subpage-facts dt { color: var(--ink-muted); font-size: .7rem; }
.subpage-facts dd { margin: 0; font-family: var(--display); font-size: .78rem; font-weight: 750; letter-spacing: .06em; }

.article-layout { display: grid; grid-template-columns: minmax(180px, .45fr) minmax(0, 1.55fr); gap: clamp(3.5rem, 9vw, 9rem); align-items: start; padding-block: clamp(4rem, 9vw, 8rem); }
.page-toc { position: sticky; top: 110px; display: grid; border-top: 3px solid var(--signal); }
.page-toc p { margin: 0; padding: 15px 0 11px; color: var(--signal-dark); font-family: var(--display); font-size: .67rem; font-weight: 800; letter-spacing: .12em; }
.page-toc a { padding: 10px 0; color: var(--ink-soft); border-top: 1px solid var(--line); font-size: .76rem; }
.page-toc a:hover { color: var(--signal-dark); }

.article-content { min-width: 0; max-width: 820px; }
.article-content section { padding-bottom: clamp(3.5rem, 7vw, 6rem); scroll-margin-top: 100px; }
.article-content section + section { padding-top: clamp(3.5rem, 7vw, 6rem); border-top: 1px solid var(--line); }
.article-kicker { margin: 0 0 14px; color: var(--signal-dark); font-family: var(--display); font-size: .68rem; font-weight: 800; letter-spacing: .15em; }
.article-content h2 { margin: 0 0 24px; font-family: var(--serif); font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.2; }
.article-content h3 { margin: 0 0 8px; font-family: var(--serif); font-size: 1.2rem; }
.article-content p { margin: 0; color: var(--ink-soft); }
.article-content p + p { margin-top: 16px; }
.article-content a:not(.button) { color: var(--signal-dark); border-bottom: 1px solid currentColor; }
.article-content code { padding: 2px 5px; color: var(--ink); border: 1px solid var(--line); background: var(--paper-light); font-size: .84em; overflow-wrap: anywhere; }

.check-list { display: grid; gap: 0; margin: 0; padding: 0; border-top: 1px solid var(--ink); list-style: none; }
.check-list li { position: relative; padding: 18px 0 18px 34px; color: var(--ink-soft); border-bottom: 1px solid var(--line); }
.check-list li::before { content: "✓"; position: absolute; top: 18px; left: 2px; color: var(--signal); font-weight: 800; }
.article-action { display: grid; grid-template-columns: 1fr auto; gap: 22px; align-items: center; margin-top: 34px; padding: 22px; color: var(--paper-light); background: var(--ink); }
.article-action > div { min-width: 0; display: grid; gap: 3px; }
.article-action > div > span { color: var(--paper-deep); font-size: .72rem; }

.article-steps { margin: 0; padding: 0; list-style: none; counter-reset: article-step; }
.article-steps li { display: grid; grid-template-columns: 52px 1fr; gap: 22px; padding: 0 0 34px; counter-increment: article-step; }
.article-steps li::before { content: counter(article-step, decimal-leading-zero); width: 44px; height: 44px; display: grid; place-items: center; color: var(--paper-light); border-radius: 50%; background: var(--signal); font-family: var(--display); font-size: .72rem; font-weight: 800; }
.article-steps strong { display: block; margin: 6px 0 7px; font-family: var(--serif); font-size: 1.2rem; }
.article-split { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.article-split > div { padding-top: 18px; border-top: 3px solid var(--signal); }
.question-list { border-top: 1px solid var(--ink); }
.question-list > div { padding: 23px 0; border-bottom: 1px solid var(--line); }

.compatibility-hero { background: var(--signal-soft); }
.build-display { max-width: 780px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px; margin-top: 44px; padding: clamp(20px, 3vw, 32px); color: var(--paper-light); background: var(--ink); }
.build-display .status-dot { margin: 0; }
.build-display strong { font-family: var(--display); font-size: clamp(2.3rem, 6vw, 5rem); letter-spacing: -.025em; line-height: 1; }
.build-display small { color: var(--paper-deep); font-family: var(--display); font-size: .65rem; font-weight: 700; letter-spacing: .12em; }
.compatibility-table { margin-bottom: 28px; border-block: 1px solid var(--ink); }
.compatibility-row { display: grid; grid-template-columns: .75fr 1fr .75fr .65fr; gap: 18px; align-items: center; padding: 17px 0; border-bottom: 1px solid var(--line); font-family: var(--display); font-size: .78rem; letter-spacing: .04em; }
.compatibility-row:last-child { border-bottom: 0; }
.compatibility-head { color: var(--ink-muted); font-size: .64rem; font-weight: 700; letter-spacing: .1em; }
.verified-status { color: oklch(46% 0.13 148); font-weight: 800; }
.article-notice { margin-top: 28px; padding: 22px; color: var(--paper-light); background: var(--ink); }
.article-notice strong { display: block; margin-bottom: 6px; }
.article-notice p { color: var(--paper-deep); }
.policy-date { margin: 28px 0 0; color: var(--signal-dark); font-family: var(--display); font-size: .72rem; font-weight: 750; letter-spacing: .08em; }
.compact-hero { padding-bottom: clamp(3rem, 6vw, 5rem); }
.legal-content { max-width: 740px; }

.site-footer { padding: 38px 0; color: var(--paper-deep); background: var(--ink); }
.footer-row { display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; gap: 32px; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand p { display: grid; gap: 2px; margin: 0; line-height: 1.2; }
.footer-brand strong { color: var(--paper-light); font-family: var(--display); font-size: .75rem; letter-spacing: .12em; }
.footer-brand span, .footer-note, .footer-links { font-size: .68rem; }
.footer-note { margin: 0; text-align: center; }
.footer-links { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 18px; }
.footer-links a:hover { color: var(--paper-light); }

.ad-slot[hidden] { display: none !important; }
.toast { position: fixed; right: 18px; bottom: 18px; z-index: 300; padding: 11px 15px; color: var(--paper-light); border: 1px solid var(--paper-deep); background: var(--ink); box-shadow: 8px 8px 0 var(--signal); font-size: .78rem; opacity: 0; transform: translateY(10px); pointer-events: none; transition: opacity 180ms, transform 220ms var(--ease-out); }
.toast.is-visible { opacity: 1; transform: none; }

.not-found { min-height: 100vh; display: grid; place-items: center; text-align: center; }
.not-found .container { max-width: 640px; }
.not-found h1 { margin: 0; color: var(--signal); font-family: var(--display); font-size: clamp(6rem, 20vw, 12rem); line-height: .8; }
.not-found p { margin: 28px 0; color: var(--ink-soft); font-family: var(--serif); font-size: 1.25rem; }

.button:focus-visible, button:focus-visible, a:focus-visible, summary:focus-visible {
  outline: 3px solid oklch(57% 0.18 32 / .35);
  outline-offset: 4px;
}

.hero .reveal { animation: reveal-in 720ms var(--ease-out) both; animation-delay: calc(var(--i, 0) * 110ms + 80ms); }
@keyframes reveal-in { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }

@container preview (max-width: 600px) {
  .coverage-list { grid-template-columns: 1fr; }
  .coverage-list div { grid-template-columns: 90px 1fr; align-items: baseline; border-bottom: 1px solid var(--line); }
}

@container ticket (min-width: 430px) {
  .ticket-file { grid-template-columns: 1fr auto; align-items: end; }
}

@media (max-width: 980px) {
  .nav-row { grid-template-columns: 1fr auto; }
  nav { display: none; }
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(310px, .75fr); gap: 3.5rem; }
  .hero-meta { grid-template-columns: repeat(2, 1fr); }
  .hero-meta > div:nth-child(2) { border-right: 0; }
  .hero-meta > div:nth-child(-n+2) { border-bottom: 1px solid var(--ink); }
  .install-layout { grid-template-columns: 1fr; gap: 5rem; }
  .install-lead { position: static; }
  .install-lead > p:not(.section-index) { max-width: 38rem; }
  .faq-layout { gap: 4rem; }
}

@media (max-width: 760px) {
  html { scroll-padding-top: 75px; }
  .container { width: min(calc(100% - 32px), var(--container)); }
  .nav-row { min-height: 66px; gap: 16px; }
  .brand img { width: 36px; height: 36px; }
  .brand strong { font-size: .72rem; }
  .brand small { display: none; }
  .header-download { min-height: 40px; padding-inline: 13px; }
  .hero { padding-top: 3.5rem; }
  .hero::before { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 3.5rem; }
  .hero-copy { max-width: none; }
  .route-board { width: min(100% - 14px, 500px); margin-inline: auto; }
  .hero-marquee { margin-top: 5rem; }
  .section-heading, .install-layout, .verification-layout, .faq-layout { grid-template-columns: 1fr; }
  .section-heading, .verification-layout { gap: 2rem; }
  .section-heading h2 br { display: none; }
  .preview { box-shadow: 10px 10px 0 var(--paper-deep); }
  .install-layout, .faq-layout { gap: 5rem; }
  .maintenance-grid { gap: 22px; }
  .verification-layout h2 { max-width: none; }
  .footer-row { grid-template-columns: 1fr; text-align: center; }
  .footer-brand, .footer-links { justify-content: center; }
  .subpage-facts { grid-template-columns: 1fr; }
  .subpage-facts div { grid-template-columns: 100px 1fr; align-items: baseline; padding: 13px 0; border-bottom: 1px solid var(--line); }
  .subpage-facts div:last-child { border-bottom: 0; }
  .article-layout { grid-template-columns: 1fr; gap: 3.5rem; }
  .page-toc { position: static; grid-template-columns: repeat(2, 1fr); }
  .page-toc p { grid-column: 1 / -1; }
  .page-toc a { padding-right: 12px; }
  .article-action { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .hero-title-en { font-size: clamp(3.7rem, 21vw, 5.2rem); }
  .hero-title-zh { font-size: clamp(1.8rem, 9vw, 2.5rem); }
  .eyebrow { flex-wrap: wrap; }
  .eyebrow span + span { width: 100%; padding-left: 48px; }
  .actions { display: grid; }
  .button { width: 100%; }
  .route-board-head { padding-inline: 19px; }
  .route-code { width: 40px; height: 40px; }
  .route-version { padding-inline: 22px; }
  .route-facts { padding-inline: 22px; }
  .hero-meta { grid-template-columns: 1fr; border-inline: 0; }
  .hero-meta > div { border-right: 0; border-bottom: 1px solid var(--ink); }
  .hero-meta > div:last-child { border-bottom: 0; }
  .preview figcaption { display: grid; }
  .install-steps li { grid-template-columns: 48px 1fr; gap: 16px; }
  .install-steps li::before { width: 44px; height: 44px; }
  .install-steps li:not(:last-child)::after { top: 44px; left: 21px; }
  .install-steps li > div { padding-top: 4px; }
  .maintenance-grid { grid-template-columns: 1fr; }
  .checksum { grid-template-columns: 1fr; }
  .checksum button { justify-self: start; }
  .faq-list summary { padding-right: 40px; }
  .faq-list details p { padding-right: 8px; }
  .article-split { grid-template-columns: 1fr; }
  .build-display { grid-template-columns: auto 1fr; }
  .build-display small { grid-column: 2; }
  .compatibility-row { grid-template-columns: 1fr 1fr; gap: 8px 16px; }
  .compatibility-head { display: none; }
  .compatibility-row span:nth-child(3)::before { content: "引擎："; color: var(--ink-muted); }
  .compatibility-row span:nth-child(4)::before { content: "状态："; color: var(--ink-muted); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-delay: 0ms !important; transition-duration: .01ms !important; }
  .marquee-track { animation: none !important; transform: none; will-change: auto; }
}