/* Hallmark · macrostructure: Workbench · tone: technical-atmospheric · anchor hue: cool-blue · nav: N10 · footer: Ft5 · contrast: pass (40–41) · slop: pass (42–45) · honest: pass (46) · chrome: pass (47) · tokens: pass (48) · responsive: pass (49) · icons: pass (30) · mobile: pass (34, 49, 50–57) */
@import url("../../tokens.css?v=20260826c");

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; scroll-padding-top: calc(var(--nav-height) + var(--space-lg)); }
body {
  margin: 0;
  min-width: 20rem;
  overflow-x: clip;
  background: var(--color-paper-deep);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.65;
  padding-bottom: calc(4.75rem + env(safe-area-inset-bottom));
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
button, a { -webkit-tap-highlight-color: var(--color-transparent); }
button, input { font: inherit; }
a { color: var(--color-info); text-underline-offset: 0.2em; }
a:active { color: var(--color-focus); }
button:not(.btn):active { transform: translateY(var(--space-3xs)); }
summary:active { background: var(--color-paper-3); }
button:disabled, a[aria-disabled="true"], summary[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
[data-state="loading"] { cursor: progress; }
[data-state="error"] { outline: var(--rule-heavy) solid var(--color-error); outline-offset: var(--space-2xs); }
[data-state="success"] { outline: var(--rule-heavy) solid var(--color-success); outline-offset: var(--space-2xs); }
p, h1, h2, h3, ul, ol, dl, figure { margin-block: 0; }
ul, ol { padding-inline-start: 1.25rem; }
h1, h2, h3 {
  color: var(--color-ink);
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 800;
  letter-spacing: -0.028em;
  line-height: 1.14;
  min-width: 0;
  overflow-wrap: anywhere;
}
h1 { font-size: var(--text-display-s); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h3 { font-size: var(--text-lg); }
small { font-size: var(--text-sm); }
[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  z-index: var(--z-tooltip);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-paper-warm);
  color: var(--color-ink-dark);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.shell { width: min(100% - (var(--page-gutter) * 2), var(--page-max)); margin-inline: auto; }
.section { padding-block: var(--space-3xl); }
.section--tight { padding-block: var(--space-2xl); }
.section--paper {
  background: var(--color-paper-warm);
  color: var(--color-ink-dark);
}
.section--paper h2, .section--paper h3 { color: var(--color-ink-dark); }
.section--raised {
  background: var(--color-paper);
  color: var(--color-ink);
}
.section-head { display: grid; gap: var(--space-sm); margin-block-end: var(--space-xl); max-width: 50rem; }
.section-head p { color: var(--color-muted); max-width: 64ch; }
.section--paper .section-head p { color: var(--color-paper-3); }
.section-note { color: var(--color-muted); max-width: 64ch; }

.site-nav {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: var(--z-sticky);
  min-height: var(--nav-height);
  background-color: var(--color-paper-deep);
  border-block-end: var(--rule-hair) solid var(--color-rule);
  transition: background-color var(--dur-mid) var(--ease-out), border-color var(--dur-mid) var(--ease-out), transform var(--dur-mid) var(--ease-out);
}
.site-nav__inner {
  width: min(100% - (var(--page-gutter) * 2), var(--page-max));
  min-height: var(--nav-height);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  transition: max-width var(--dur-mid) var(--ease-out), transform var(--dur-mid) var(--ease-out), background-color var(--dur-mid) var(--ease-out), box-shadow var(--dur-mid) var(--ease-out), border-radius var(--dur-mid) var(--ease-out);
}
.site-nav.is-floating { background-color: var(--color-transparent); border-color: var(--color-transparent); transform: translateY(var(--space-xs)); }
.site-nav.is-floating .site-nav__inner {
  max-width: 58rem;
  padding-inline: var(--space-md);
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-sm);
  box-shadow: 0 var(--space-xs) var(--space-xl) var(--color-shadow), inset 0 0 0 var(--rule-hair) var(--color-rule);
}
.brand { display: flex; align-items: center; gap: var(--space-sm); color: var(--color-ink); text-decoration: none; white-space: nowrap; }
.brand__mark { width: 2rem; height: 2rem; object-fit: cover; border-radius: var(--radius-xs); image-rendering: auto; }
.brand__text { font-family: var(--font-display); font-weight: 800; letter-spacing: -0.02em; }
.nav-links { display: none; align-items: center; gap: var(--space-lg); }
.nav-links a, .mobile-menu a, .footer-link, .tab-btn { white-space: nowrap; }
.nav-links a { color: var(--color-ink-2); text-decoration: none; font-size: var(--text-sm); }
.nav-links a[aria-current="page"], .nav-links a:hover { color: var(--color-info); }
.nav-actions { display: flex; align-items: center; gap: var(--space-xs); }
.nav-download { display: none; }
.menu-toggle {
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  display: grid;
  place-items: center;
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-sm);
  background: var(--color-paper);
  color: var(--color-ink);
}
.menu-toggle span, .menu-toggle::before, .menu-toggle::after {
  content: "";
  display: block;
  width: 1rem;
  height: var(--rule-heavy);
  background: currentColor;
}
.menu-toggle { gap: var(--space-2xs); }
.mobile-menu {
  position: fixed;
  inset-block-start: var(--nav-height);
  inset-inline: var(--page-gutter);
  z-index: var(--z-dropdown);
  display: grid;
  padding: var(--space-sm);
  background: var(--color-paper-2);
  border: var(--rule-hair) solid var(--color-rule);
  box-shadow: 0 var(--space-sm) var(--space-2xl) var(--color-shadow);
}
.mobile-menu a { min-height: 2.75rem; display: flex; align-items: center; padding-inline: var(--space-sm); color: var(--color-ink); text-decoration: none; }

.btn {
  position: relative;
  isolation: isolate;
  min-height: 2.875rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  border: var(--rule-heavy) solid var(--color-transparent);
  border-radius: var(--radius-sm);
  font-weight: 800;
  line-height: 1.15;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 var(--space-2xs) 0 var(--color-shadow);
  overflow: clip;
  transition: background-color var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out), border-color var(--dur-short) var(--ease-out), transform var(--dur-micro) var(--ease-out), opacity var(--dur-short) var(--ease-out);
}
.btn--primary { background: var(--color-action); color: var(--color-action-ink); border-color: var(--color-action); }
.btn--primary::after {
  content: "";
  position: absolute;
  inset: -30% auto -30% -35%;
  z-index: -1;
  width: 28%;
  background: linear-gradient(90deg, var(--color-transparent), var(--color-shine), var(--color-transparent));
  transform: skewX(-18deg) translateX(-220%);
  opacity: 0;
}
.btn--secondary { background: var(--color-transparent); color: var(--color-info); border-color: var(--color-info); box-shadow: none; }
.btn--quiet { background: var(--color-paper-2); color: var(--color-ink); border-color: var(--color-rule); box-shadow: none; }
.btn--large { min-height: 3.5rem; padding-inline: var(--space-xl); font-size: var(--text-md); }
.btn:active, .btn.is-active { transform: translateY(var(--space-2xs)); box-shadow: 0 var(--space-3xs) 0 var(--color-shadow); }
.btn[aria-disabled="true"], .btn:disabled, .btn.is-disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
.btn[data-state="loading"] { opacity: 0.76; cursor: progress; }
.btn[data-state="error"] { border-color: var(--color-error); }
.btn[data-state="success"] { border-color: var(--color-success); }

:focus { outline: none; }
:focus-visible { outline: var(--rule-heavy) solid var(--color-focus); outline-offset: var(--space-2xs); }

.hero-store { position: relative; padding-block: calc(var(--nav-height) + var(--space-md)) calc(var(--space-3xl) + var(--space-md)); background: var(--color-paper); }
.hero-store::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("../images/yi-ci-xing-jiao-yi-da-shi-hero-01.webp");
  background-position: center;
  background-size: cover;
  opacity: 0.11;
  transform: scale(1.03);
  animation: hero-breathe 18s var(--ease-in-out) alternate infinite;
}
.hero-store::after { content: ""; position: absolute; inset: 0; background: var(--color-overlay-soft); }
.hero-store__grid { position: relative; z-index: var(--z-base); display: grid; gap: var(--space-lg); }
.media-workbench { display: grid; grid-template-rows: auto auto; align-content: start; gap: var(--space-sm); min-width: 0; }
.media-main {
  position: relative;
  margin: 0;
  aspect-ratio: 16 / 9;
  overflow: clip;
  background: var(--color-paper-deep);
  border: var(--rule-hair) solid var(--color-rule);
  width: 100%;
}
.media-main img { width: 100%; height: 100%; object-fit: cover; }
.media-main figcaption {
  position: absolute;
  inset-inline: var(--space-sm);
  inset-block-end: var(--space-sm);
  max-width: calc(100% - (var(--space-lg)));
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-overlay);
  color: var(--color-ink);
  font-size: var(--text-sm);
}
.media-thumbs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-xs); width: 100%; }
.media-thumb {
  min-width: 0;
  padding: 0;
  border: var(--rule-heavy) solid var(--color-rule);
  background: var(--color-paper-2);
  aspect-ratio: 16 / 9;
  overflow: clip;
}
.media-thumb[aria-current="true"] { border-color: var(--color-info); }
.media-thumb img { width: 100%; height: 100%; object-fit: cover; }
.product-panel {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--color-paper-deep);
  border: var(--rule-hair) solid var(--color-rule);
  min-width: 0;
}
.product-logo { width: min(100%, 20rem); max-height: 4.5rem; object-fit: contain; object-position: left center; }
.tag-row { display: flex; flex-wrap: wrap; gap: var(--space-xs); }
.tag {
  display: inline-flex;
  min-height: 1.8rem;
  align-items: center;
  padding-inline: var(--space-sm);
  border: var(--rule-hair) solid var(--color-info-soft);
  border-radius: var(--radius-xs);
  background: var(--color-paper-2);
  color: var(--color-info);
  font-size: var(--text-sm);
  white-space: nowrap;
}
.product-panel h1 span { display: block; margin-block-start: var(--space-xs); font-family: var(--font-body); color: var(--color-muted); font-size: var(--text-md); font-weight: 400; letter-spacing: 0; }
.product-lede { color: var(--color-ink-2); max-width: 46ch; font-size: var(--text-md); }
.metric-strip { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-block: var(--rule-hair) solid var(--color-rule); }
.metric { display: grid; gap: var(--space-3xs); padding: var(--space-sm); min-width: 0; }
.metric:nth-child(odd) { border-inline-end: var(--rule-hair) solid var(--color-rule); }
.metric strong { font-variant-numeric: tabular-nums; font-size: var(--text-md); color: var(--color-ink); overflow-wrap: anywhere; }
.metric span { color: var(--color-muted); font-size: var(--text-xs); }
.product-actions { display: grid; gap: var(--space-sm); margin-block-start: auto; }
.trust-line { color: var(--color-muted); font-size: var(--text-sm); }
.product-panel .metric-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.product-panel .metric:nth-child(even) { border-inline-end: 0; }
.product-panel .metric:nth-child(-n + 2) { border-block-end: var(--rule-hair) solid var(--color-rule); }

.info-rack { background: var(--color-paper-warm); color: var(--color-ink-dark); }
.info-rack__grid { display: grid; }
.info-cell { padding: var(--space-lg); border-block-end: var(--rule-hair) solid var(--color-paper-3); }
.info-cell span { display: block; color: var(--color-paper-3); font-size: var(--text-sm); }
.info-cell strong { display: block; margin-block-start: var(--space-2xs); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }

.story-layout { display: grid; gap: var(--space-xl); }
.story-copy { display: grid; gap: var(--space-md); color: var(--color-ink-2); font-size: var(--text-md); max-width: 68ch; }
.story-aside { align-self: start; padding: var(--space-lg); background: var(--color-paper-2); border-block-start: var(--rule-heavy) solid var(--color-accent); }
.story-aside h3 { margin-block-end: var(--space-sm); }
.story-aside ul { display: grid; gap: var(--space-xs); color: var(--color-ink-2); }

.workbench-stack { display: grid; gap: var(--space-2xl); }
.workbench-step { display: grid; gap: var(--space-lg); align-items: center; }
.workbench-step figure { position: relative; min-width: 0; border: var(--rule-hair) solid var(--color-rule); background: var(--color-paper-deep); }
.workbench-step figure img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.workbench-step figcaption { padding: var(--space-sm); color: var(--color-muted); font-size: var(--text-sm); }
.workbench-copy { display: grid; gap: var(--space-sm); }
.workbench-copy p { color: var(--color-ink-2); }
.mechanic-label { color: var(--color-info); font-weight: 800; }

.feature-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-md); }
.feature-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-md);
  align-content: start;
  padding: var(--space-lg);
  background: var(--color-paper-2);
  border: var(--rule-hair) solid var(--color-rule);
  transition: transform var(--dur-short) var(--ease-out), background-color var(--dur-short) var(--ease-out);
}
.feature-card__index { font-family: var(--font-display); color: var(--color-info); font-size: var(--text-xl); font-variant-numeric: tabular-nums; }
.feature-card p { color: var(--color-ink-2); margin-block-start: var(--space-xs); }
.feature-card:nth-child(2) { background: var(--color-paper-3); }
.feature-card:nth-child(3) { border-color: var(--color-info-soft); }

.gallery-preview, .gallery-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-sm); }
.gallery-item {
  position: relative;
  min-width: 0;
  padding: 0;
  overflow: clip;
  border: var(--rule-hair) solid var(--color-rule);
  background: var(--color-paper-2);
  color: var(--color-ink);
  text-align: start;
}
.gallery-item img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; transition: opacity var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out); }
.gallery-item span { display: block; padding: var(--space-sm); }
.gallery-item.is-error::after { content: "图片加载失败"; position: absolute; inset: 0; display: grid; place-items: center; background: var(--color-paper-2); color: var(--color-error); }
.gallery-more { margin-block-start: var(--space-xl); }
.filter-tabs { display: flex; align-items: center; gap: var(--space-xs); flex-wrap: wrap; margin-block-end: var(--space-xl); }
.tab-btn {
  min-height: 2.75rem;
  padding-inline: var(--space-md);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-xs);
  background: var(--color-paper-2);
  color: var(--color-ink-2);
}
.tab-btn[aria-selected="true"] { background: var(--color-info-soft); color: var(--color-ink); border-color: var(--color-info); }

.spec-table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.spec-table th, .spec-table td { padding: var(--space-md) var(--space-sm); border-block-end: var(--rule-hair) solid var(--color-rule); text-align: start; vertical-align: top; }
.spec-table th { width: 36%; color: var(--color-muted); font-weight: 400; }
.spec-table td { color: var(--color-ink); }
.section--paper .spec-table th { color: var(--color-paper-3); }
.section--paper .spec-table td { color: var(--color-ink-dark); }
.section--paper .spec-table th, .section--paper .spec-table td { border-color: var(--color-paper-3); }

.timeline { display: grid; gap: 0; }
.timeline-item { display: grid; grid-template-columns: 5.5rem minmax(0, 1fr); gap: var(--space-md); padding-block: var(--space-lg); border-block-start: var(--rule-hair) solid var(--color-rule); }
.timeline-item time { color: var(--color-info); font-variant-numeric: tabular-nums; }
.timeline-item p { margin-block-start: var(--space-xs); color: var(--color-ink-2); }

.review-ledger { display: grid; gap: var(--space-lg); }
.review-score { display: grid; gap: var(--space-xs); padding: var(--space-xl); background: var(--color-info-soft); border: var(--rule-hair) solid var(--color-info); }
.review-score strong { font-family: var(--font-display); font-size: clamp(3.2rem, 12vw, 6.5rem); line-height: 0.9; font-variant-numeric: tabular-nums; }
.review-score p { color: var(--color-ink-2); }
.fit-list { display: grid; gap: var(--space-md); }
.fit-item { padding-block: var(--space-lg); border-block-start: var(--rule-hair) solid var(--color-rule); }
.fit-item p { color: var(--color-ink-2); margin-block-start: var(--space-xs); }

.accordion { display: grid; gap: var(--space-xs); }
.accordion details { background: var(--color-paper-2); border: var(--rule-hair) solid var(--color-rule); }
.accordion summary { min-height: 3.5rem; display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); padding: var(--space-md); cursor: pointer; list-style: none; font-weight: 800; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after { content: "+"; color: var(--color-info); font-size: var(--text-lg); }
.accordion details[open] summary::after { content: "−"; }
.accordion__answer { padding: 0 var(--space-md) var(--space-lg); color: var(--color-ink-2); }

.download-callout { display: grid; gap: var(--space-lg); align-items: center; padding: var(--space-xl); background: var(--color-paper-warm); color: var(--color-ink-dark); }
.download-callout h2 { color: var(--color-ink-dark); }
.download-callout p { margin-block-start: var(--space-xs); color: var(--color-paper-3); }

.page-hero { padding-block: calc(var(--nav-height) + var(--space-lg)) calc(var(--space-3xl) + var(--space-lg)); background: var(--color-paper); }
.page-hero__grid { display: grid; gap: var(--space-xl); align-items: end; }
.page-hero p { margin-block-start: var(--space-md); color: var(--color-ink-2); font-size: var(--text-md); max-width: 58ch; }
.page-hero__media { border: var(--rule-hair) solid var(--color-rule); }
.page-hero__media img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }

.platform-grid, .requirements-grid, .guide-card-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-md); }
.platform-card, .requirement-card, .guide-card { padding: var(--space-lg); background: var(--color-paper-2); border: var(--rule-hair) solid var(--color-rule); }
.platform-card--recommended { border-color: var(--color-info); }
.platform-card p, .requirement-card p, .guide-card p { color: var(--color-ink-2); }
.platform-card .btn, .guide-card .btn { margin-block-start: var(--space-lg); }
.card-badge { display: inline-flex; margin-block-end: var(--space-md); padding: var(--space-2xs) var(--space-sm); background: var(--color-info-soft); color: var(--color-info); font-size: var(--text-sm); }
.requirement-card dl { margin-block-start: var(--space-lg); }
.requirement-card dl div { display: grid; grid-template-columns: 6rem minmax(0, 1fr); gap: var(--space-sm); padding-block: var(--space-sm); border-block-start: var(--rule-hair) solid var(--color-rule); }
.requirement-card dt { color: var(--color-muted); }
.requirement-card dd { margin: 0; overflow-wrap: anywhere; }

.steps { counter-reset: install; display: grid; gap: var(--space-md); }
.step { counter-increment: install; display: grid; grid-template-columns: 3rem minmax(0, 1fr); gap: var(--space-md); padding-block: var(--space-lg); border-block-start: var(--rule-hair) solid var(--color-rule); }
.step::before { content: counter(install, decimal-leading-zero); font-family: var(--font-display); color: var(--color-info); font-size: var(--text-xl); }
.step p { margin-block-start: var(--space-xs); color: var(--color-ink-2); }

.guide-layout { display: grid; gap: var(--space-xl); }
.toc { align-self: start; padding: var(--space-lg); background: var(--color-paper-2); border: var(--rule-hair) solid var(--color-rule); }
.toc h2 { font-size: var(--text-lg); }
.toc ol { display: grid; gap: var(--space-xs); margin-block-start: var(--space-md); }
.toc a { text-decoration: none; }
.guide-article { min-width: 0; }
.guide-section { padding-block: var(--space-2xl); border-block-start: var(--rule-hair) solid var(--color-rule); }
.guide-section:first-child { padding-block-start: 0; border: 0; }
.guide-section > p, .guide-section > ul, .guide-section > ol { margin-block-start: var(--space-md); color: var(--color-ink-2); max-width: 68ch; }
.guide-section li + li { margin-block-start: var(--space-xs); }
.route-table { width: 100%; margin-block-start: var(--space-lg); border-collapse: collapse; }
.route-table th, .route-table td { padding: var(--space-sm); border: var(--rule-hair) solid var(--color-rule); text-align: start; vertical-align: top; }
.route-table th { color: var(--color-info); }
.article-meta { display: flex; flex-wrap: wrap; gap: var(--space-xs) var(--space-lg); color: var(--color-muted); font-size: var(--text-sm); }

.lightbox {
  position: fixed;
  inset: 0;
  margin: auto;
  width: min(94%, 76rem);
  height: fit-content;
  max-height: 92dvh;
  padding: var(--space-md);
  border: var(--rule-hair) solid var(--color-rule);
  background: var(--color-paper-deep);
  color: var(--color-ink);
}
.lightbox::backdrop { background: var(--color-overlay); }
.lightbox__stage { display: grid; grid-template-columns: 2.75rem minmax(0, 1fr) 2.75rem; align-items: center; gap: var(--space-xs); }
.lightbox__stage img { width: 100%; max-height: 76dvh; object-fit: contain; }
.lightbox__nav, .lightbox__close {
  min-width: 2.75rem;
  min-height: 2.75rem;
  border: var(--rule-hair) solid var(--color-rule);
  background: var(--color-paper-2);
  color: var(--color-ink);
}
.lightbox__close { display: block; margin-inline-start: auto; margin-block-end: var(--space-sm); padding-inline: var(--space-md); }
.lightbox__caption { padding-block-start: var(--space-sm); color: var(--color-muted); }

.site-footer { padding-block: var(--space-3xl) calc(var(--space-3xl) + 4rem); background: var(--color-paper-deep); color: var(--color-ink); }
.footer-statement { max-width: 28ch; font-family: var(--font-display); font-size: clamp(1.8rem, 6vw, 3.6rem); font-weight: 800; line-height: 1.14; }
.footer-groups { display: grid; gap: var(--space-xl); margin-block-start: var(--space-2xl); }
.footer-group h2, .footer-group h3 { font-size: var(--text-md); }
.footer-links { display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-xs) var(--space-lg); margin-block-start: var(--space-sm); }
.footer-link { color: var(--color-muted); text-decoration: none; }
.footer-link:hover { color: var(--color-info); }
.footer-meta { display: grid; gap: var(--space-sm); margin-block-start: var(--space-2xl); padding-block-start: var(--space-lg); border-block-start: var(--rule-hair) solid var(--color-rule); color: var(--color-muted); font-size: var(--text-sm); }

.sticky-download {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  z-index: var(--z-sticky);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) max(var(--space-md), env(safe-area-inset-right)) max(var(--space-sm), env(safe-area-inset-bottom)) max(var(--space-md), env(safe-area-inset-left));
  background: var(--color-paper-deep);
  border-block-start: var(--rule-hair) solid var(--color-rule);
}
.sticky-download span { color: var(--color-muted); font-size: var(--text-sm); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.back-to-top {
  position: fixed;
  inset-inline-end: var(--space-md);
  inset-block-end: 5.5rem;
  z-index: var(--z-raised);
  min-width: 2.75rem;
  height: 2.75rem;
  border: var(--rule-hair) solid var(--color-rule);
  background: var(--color-paper-2);
  color: var(--color-ink);
  opacity: 0;
  pointer-events: none;
  transform: translateY(var(--space-xs));
  transition: opacity var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out);
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: none; }

@keyframes hero-breathe { to { transform: scale(1.08); } }

@media (hover: hover) and (pointer: fine) {
  .btn--primary:hover::after, .btn--primary:focus-visible::after { opacity: 1; animation: button-shine var(--dur-long) var(--ease-out) forwards; }
  .btn--secondary:hover { background: var(--color-info-soft); }
  .feature-card:hover { transform: translateY(calc(var(--space-3xs) * -1)); }
  .gallery-item:hover img { transform: scale(1.015); }
  .media-thumb:hover { border-color: var(--color-info); }
}
@keyframes button-shine { to { transform: skewX(-18deg) translateX(650%); } }

@media (min-width: 40rem) {
  .nav-download { display: inline-flex; }
  .metric-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .metric:nth-child(n) { border-inline-end: var(--rule-hair) solid var(--color-rule); }
  .metric:last-child { border-inline-end: 0; }
  .info-rack__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .info-cell:nth-child(odd) { border-inline-end: var(--rule-hair) solid var(--color-paper-3); }
  .gallery-preview, .gallery-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-card:first-child { grid-row: span 2; align-content: center; }
  .review-ledger { grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.4fr); }
  .platform-grid, .requirements-grid, .guide-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .download-callout { grid-template-columns: minmax(0, 1fr) auto; }
  .footer-groups { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
  .footer-meta { grid-template-columns: minmax(0, 1fr) auto; align-items: end; }
}

@media (min-width: 60rem) {
  body { padding-bottom: 0; }
  .nav-links { display: flex; }
  .menu-toggle, .mobile-menu { display: none; }
  .hero-store__grid { grid-template-columns: minmax(0, 1.55fr) minmax(20rem, 0.85fr); }
  .info-rack__grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .info-cell { border-inline-end: var(--rule-hair) solid var(--color-paper-3); border-block-end: 0; }
  .info-cell:last-child { border-inline-end: 0; }
  .story-layout { grid-template-columns: minmax(0, 1.45fr) minmax(18rem, 0.65fr); }
  .workbench-step { grid-template-columns: minmax(0, 1.55fr) minmax(17rem, 0.65fr); }
  .workbench-step:nth-child(even) figure { order: 2; }
  .gallery-preview { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .gallery-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-hero__grid { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); }
  .guide-layout { grid-template-columns: 17rem minmax(0, 1fr); }
  .toc { position: sticky; inset-block-start: calc(var(--nav-height) + var(--space-xl)); }
  .sticky-download { left: auto; right: var(--space-lg); bottom: var(--space-lg); width: min(30rem, calc(100% - (var(--space-xl)))); border: var(--rule-hair) solid var(--color-rule); border-radius: var(--radius-sm); }
  .back-to-top { inset-block-end: 6.5rem; }
}

@media (min-width: 90rem) {
  .gallery-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (pointer: coarse) {
  .btn, .tab-btn, .media-thumb, summary, .footer-link { min-height: 2.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .hero-store::before { transform: none; }
}