/* Hallmark · macrostructure: Catalogue · H2 knobs: ratio=7/5, right=proof-column, divider=vertical-rule
 * theme: custom · vibe: "deep-space store, shrine red, pixel dossier" · paper: oklch(20% 0.018 255) · accent: oklch(79% 0.18 120)
 * display: Tomorrow · body: Noto Sans SC · axes: dark / geometric-sans / chromatic-green
 * enrichment: reviewed official game media · nav: N11 · footer: Ft2 · context: inferred · studied: no
 * Hallmark · pre-emit critique: P5 H5 E4 S5 R4 V5 · contrast: pass (40–41) · mobile: pass (34, 49–57)
 * slop: pass (42–45) · honest: pass (46) · chrome: pass (47) · tokens: pass (48) · icons: pass (30)
 */

:root {
  --color-paper: oklch(20% 0.018 255);
  --color-paper-2: oklch(24% 0.022 255);
  --color-paper-3: oklch(28% 0.028 255);
  --color-paper-purple: oklch(23% 0.04 305);
  --color-ink: oklch(95% 0.018 86);
  --color-ink-2: oklch(87% 0.012 86);
  --color-muted: oklch(73% 0.014 250);
  --color-neutral: oklch(62% 0.016 250);
  --color-rule: oklch(39% 0.026 250);
  --color-rule-2: oklch(32% 0.022 250);
  --color-link: oklch(77% 0.11 235);
  --color-link-hover: oklch(86% 0.08 235);
  --color-story: oklch(52% 0.16 28);
  --color-story-soft: oklch(30% 0.07 28);
  --color-accent: oklch(79% 0.18 120);
  --color-accent-hover: oklch(84% 0.2 120);
  --color-accent-ink: oklch(19% 0.03 120);
  --color-focus: oklch(84% 0.18 120);
  --color-error: oklch(67% 0.2 25);
  --color-success: oklch(79% 0.18 120);
  --color-overlay: oklch(10% 0.014 255 / 0.86);
  --color-scrim: oklch(10% 0.014 255 / 0.62);
  --color-shadow: oklch(8% 0.015 255 / 0.45);
  --color-sheen: oklch(96% 0.02 100 / 0.52);

  --font-display: "Tomorrow", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", sans-serif;
  --font-mono: "Tomorrow", "Noto Sans SC", sans-serif;

  --space-3xs: 0.125rem;
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 9rem;

  --text-xs: 0.8rem;
  --text-sm: 0.9rem;
  --text-base: 1rem;
  --text-md: 1.125rem;
  --text-lg: 1.35rem;
  --text-xl: 1.75rem;
  --text-2xl: 2.35rem;
  --text-display: clamp(2.15rem, 5vw + 0.5rem, 4.7rem);

  --page-max: 76rem;
  --page-gutter: clamp(1rem, 4vw, 2.5rem);
  --radius-xs: 0.125rem;
  --radius-sm: 0.25rem;
  --rule: 1px;
  --hard-shadow: 0 4px 0 var(--color-accent-ink);
  --panel-shadow: 0 18px 48px var(--color-shadow);

  --dur-micro: 120ms;
  --dur-short: 220ms;
  --dur-long: 420ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.7, 0, 0.84, 0);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  --z-base: 1;
  --z-raised: 10;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 400;
  --z-toast: 500;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; scroll-padding-top: 5.5rem; }
body {
  margin: 0;
  overflow-x: clip;
  color: var(--color-ink-2);
  background: var(--color-paper);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  padding-bottom: calc(4.75rem + env(safe-area-inset-bottom));
}
img { display: block; max-width: 100%; }
figure { margin: 0; }
button, input, select, textarea { font: inherit; }
a { color: var(--color-link); text-decoration-thickness: var(--rule); text-underline-offset: 0.22em; }
h1, h2, h3, h4, p { margin-block: 0; }
h1, h2, h3, h4 {
  color: var(--color-ink);
  font-family: var(--font-display);
  font-style: normal;
  line-height: 1.12;
  overflow-wrap: anywhere;
  min-width: 0;
}
h1 { font-size: var(--text-display); letter-spacing: -0.045em; }
h2 { font-size: clamp(1.85rem, 3.4vw, 3.2rem); letter-spacing: -0.035em; }
h3 { font-size: var(--text-lg); letter-spacing: -0.018em; }
p { max-width: 68ch; }
ul, ol { margin-block: 0; padding-inline-start: 1.25rem; }
li + li { margin-block-start: var(--space-xs); }
small { font-size: var(--text-xs); }

:focus { outline: none; }
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  z-index: var(--z-toast);
  transform: translateY(-160%);
  padding: var(--space-sm) var(--space-md);
  color: var(--color-accent-ink);
  background: var(--color-accent);
}
.skip-link:focus { transform: none; }

.container {
  width: min(100%, var(--page-max));
  margin-inline: auto;
  padding-inline: var(--page-gutter);
}
.section { padding-block: var(--space-2xl); }
.section--tight { padding-block: var(--space-xl); }
.surface {
  color: var(--color-ink-2);
  background: var(--color-paper-2);
}
.surface--purple {
  color: var(--color-ink-2);
  background: var(--color-paper-purple);
}
.section-head {
  display: grid;
  gap: var(--space-sm);
  margin-block-end: var(--space-xl);
}
.section-kicker,
.eyebrow {
  color: var(--color-link);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.section-head > p { color: var(--color-muted); font-size: var(--text-md); }
.tabular { font-variant-numeric: tabular-nums; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Navigation · N11 */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: var(--z-sticky);
  min-height: 4.5rem;
  color: var(--color-ink);
  background: var(--color-paper);
  border-block-end: var(--rule) solid var(--color-rule);
}
.nav-bar {
  min-height: 4.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}
.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}
.brand img { width: 7.8rem; height: auto; }
.nav-desktop { display: none; }
.mega-panel { display: none; }
.nav-actions { display: flex; align-items: center; gap: var(--space-xs); }
.menu-toggle,
.icon-button {
  min-width: 44px;
  min-height: 44px;
  border: var(--rule) solid var(--color-rule);
  border-radius: var(--radius-xs);
  color: var(--color-ink);
  background: var(--color-paper-2);
  cursor: pointer;
}
.menu-toggle { padding-inline: var(--space-sm); white-space: nowrap; }
.mobile-drawer {
  position: fixed;
  inset: 4.5rem 0 auto;
  z-index: var(--z-dropdown);
  display: grid;
  gap: var(--space-xs);
  max-height: calc(100dvh - 4.5rem);
  overflow-y: auto;
  padding: var(--space-lg) var(--page-gutter);
  color: var(--color-ink-2);
  background: var(--color-paper-2);
  border-block-end: var(--rule) solid var(--color-rule);
  transform: translateY(-115%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--dur-short) var(--ease-out), opacity var(--dur-short) var(--ease-out), visibility var(--dur-short);
}
.mobile-drawer.is-open { transform: none; opacity: 1; visibility: visible; }
.drawer-link {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm);
  color: var(--color-ink);
  border-block-end: var(--rule) solid var(--color-rule-2);
  text-decoration: none;
  white-space: nowrap;
}
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-dropdown) - 1);
  background: var(--color-scrim);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-short) var(--ease-out), visibility var(--dur-short);
}
.nav-scrim.is-active { opacity: 1; visibility: visible; }

/* Buttons include supported visual states. */
.btn {
  position: relative;
  isolation: isolate;
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border: var(--rule) solid var(--color-link);
  border-radius: var(--radius-xs);
  color: var(--color-ink);
  background: var(--color-paper-3);
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: transform var(--dur-micro) var(--ease-out), background-color var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out);
}
.btn--primary {
  overflow: hidden;
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
  background: var(--color-accent);
  box-shadow: var(--hard-shadow);
}
.btn--primary::after {
  content: "";
  position: absolute;
  inset: -80% auto -80% -30%;
  z-index: -1;
  width: 16%;
  background: var(--color-sheen);
  transform: skewX(-18deg) translateX(-350%);
  transition: transform var(--dur-long) var(--ease-out);
}
.btn--large { min-height: 54px; padding-inline: var(--space-lg); font-size: var(--text-md); }
.btn--quiet { border-color: var(--color-rule); color: var(--color-link); background: var(--color-paper); }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; box-shadow: none; }
.btn[data-state="loading"] { cursor: wait; }
.btn[data-state="loading"]::before {
  content: "";
  width: 0.9rem;
  aspect-ratio: 1;
  border: 2px solid var(--color-accent-ink);
  border-inline-end-color: transparent;
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}
.btn[data-state="error"] { border-color: var(--color-error); color: var(--color-error); }
.btn[data-state="success"] { border-color: var(--color-success); }
@keyframes spin { to { transform: rotate(1turn); } }

/* Hero storefront */
.hero {
  position: relative;
  padding-block: var(--space-lg) var(--space-xl);
  color: var(--color-ink-2);
  background: var(--color-paper);
}
.hero-grid { display: grid; gap: var(--space-lg); }
.media-stage {
  display: grid;
  gap: var(--space-xs);
  min-width: 0;
}
.media-main {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-paper-3);
  border: var(--rule) solid var(--color-rule);
}
.media-main::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--color-overlay), transparent 48%);
  pointer-events: none;
}
.media-main img { width: 100%; height: 100%; object-fit: cover; }
.media-caption {
  position: absolute;
  inset: auto var(--space-md) var(--space-md);
  z-index: var(--z-raised);
  color: var(--color-ink);
  font-size: var(--text-sm);
}
.thumb-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-xs);
}
.thumb {
  min-width: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  padding: 0;
  border: 2px solid transparent;
  border-radius: var(--radius-xs);
  background: var(--color-paper-2);
  cursor: pointer;
}
.thumb.is-active { border-color: var(--color-accent); }
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.store-summary {
  min-width: 0;
  display: grid;
  align-content: start;
  gap: var(--space-lg);
  padding: var(--space-lg);
  color: var(--color-ink-2);
  background: var(--color-paper-2);
  border-block-start: 3px solid var(--color-story);
}
.store-logo { width: min(100%, 25rem); height: auto; }
.store-summary h1 { font-size: clamp(1.9rem, 4vw, 3.5rem); }
.store-summary .lede { color: var(--color-ink-2); font-size: var(--text-md); }
.tags { display: flex; flex-wrap: wrap; gap: var(--space-xs); }
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding-inline: var(--space-sm);
  color: var(--color-link-hover);
  background: var(--color-paper-3);
  border: var(--rule) solid var(--color-rule);
  border-radius: var(--radius-xs);
  font-size: var(--text-xs);
  white-space: nowrap;
}
.store-meta { display: grid; border-block-start: var(--rule) solid var(--color-rule); }
.store-meta > div {
  display: grid;
  grid-template-columns: 7.5rem minmax(0, 1fr);
  gap: var(--space-sm);
  padding-block: var(--space-xs);
  border-block-end: var(--rule) solid var(--color-rule-2);
}
.store-meta dt { color: var(--color-muted); }
.store-meta dd { margin: 0; color: var(--color-ink); }
.price-row { display: flex; align-items: end; justify-content: space-between; gap: var(--space-md); }
.price strong { display: block; color: var(--color-ink); font-family: var(--font-mono); font-size: var(--text-xl); }
.price span { display: block; color: var(--color-muted); font-size: var(--text-xs); }
.hero-actions { display: grid; gap: var(--space-sm); }

.info-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  color: var(--color-ink-2);
  background: var(--color-paper-3);
  border-block: var(--rule) solid var(--color-rule);
}
.info-item {
  min-width: 0;
  padding: var(--space-md);
  border-inline-end: var(--rule) solid var(--color-rule);
  border-block-end: var(--rule) solid var(--color-rule);
}
.info-item span { display: block; color: var(--color-muted); font-size: var(--text-xs); }
.info-item strong { display: block; color: var(--color-ink); overflow-wrap: anywhere; }

.story-layout { display: grid; gap: var(--space-xl); }
.story-copy { display: grid; gap: var(--space-lg); font-size: var(--text-md); }
.story-rail {
  display: grid;
  align-content: start;
  gap: var(--space-sm);
  padding-block: var(--space-sm);
  border-block: 3px solid var(--color-story);
}
.story-rail strong { color: var(--color-ink); font-family: var(--font-display); font-size: var(--text-xl); }

.feature-list { display: grid; border-block-start: var(--rule) solid var(--color-rule); }
.feature-row {
  display: grid;
  gap: var(--space-sm);
  padding-block: var(--space-lg);
  border-block-end: var(--rule) solid var(--color-rule);
}
.feature-index { color: var(--color-story); font-family: var(--font-mono); font-weight: 700; }
.feature-row p { color: var(--color-muted); }

.mechanic-map { display: grid; gap: var(--space-md); }
.mechanic-node {
  position: relative;
  display: grid;
  gap: var(--space-xs);
  padding: var(--space-lg);
  color: var(--color-ink-2);
  background: var(--color-paper-2);
  border: var(--rule) solid var(--color-rule);
  border-radius: var(--radius-xs);
}
.mechanic-node::before {
  content: attr(data-step);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 700;
}
.mechanic-node p { color: var(--color-muted); }

.gallery-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-md);
}
.gallery-card {
  min-width: 0;
  display: grid;
  gap: var(--space-xs);
  padding: 0;
  color: var(--color-ink);
  background: transparent;
  border: 0;
  text-align: start;
  cursor: zoom-in;
}
.gallery-card__image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-paper-3);
  border: var(--rule) solid var(--color-rule);
}
.gallery-card img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-short) var(--ease-out); }
.gallery-card span { color: var(--color-muted); font-size: var(--text-sm); }
.gallery-card[hidden] { display: none; }

.filter-tabs { display: flex; flex-wrap: wrap; gap: var(--space-xs); margin-block-end: var(--space-lg); }
.filter-tab {
  min-height: 44px;
  padding-inline: var(--space-md);
  color: var(--color-ink-2);
  background: var(--color-paper-2);
  border: var(--rule) solid var(--color-rule);
  border-radius: var(--radius-xs);
  cursor: pointer;
  white-space: nowrap;
}
.filter-tab[aria-selected="true"] { color: var(--color-accent-ink); background: var(--color-accent); border-color: var(--color-accent); }
.filter-tab:active, .menu-toggle:active, .icon-button:active, .thumb:active { transform: translateY(2px); }
.filter-tab[disabled], .menu-toggle[disabled], .icon-button[disabled], .thumb[disabled] { opacity: 0.5; cursor: not-allowed; }
.filter-tab[data-state="loading"], .menu-toggle[data-state="loading"], .icon-button[data-state="loading"] { cursor: wait; }
.filter-tab[data-state="error"], .menu-toggle[data-state="error"], .icon-button[data-state="error"] { border-color: var(--color-error); }
.filter-tab[data-state="success"], .menu-toggle[data-state="success"], .icon-button[data-state="success"] { border-color: var(--color-success); }

.spec-sheet { margin: 0; }
.spec-row {
  display: grid;
  gap: var(--space-xs);
  padding-block: var(--space-md);
  border-block-end: var(--rule) solid var(--color-rule);
}
.spec-row dt { color: var(--color-muted); }
.spec-row dd { margin: 0; color: var(--color-ink); overflow-wrap: anywhere; }

.update-list, .faq-list { display: grid; border-block-start: var(--rule) solid var(--color-rule); }
.accordion-item { border-block-end: var(--rule) solid var(--color-rule); }
.accordion-trigger {
  width: 100%;
  min-height: 60px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  color: var(--color-ink);
  background: transparent;
  border: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 700;
  text-align: start;
  cursor: pointer;
}
.accordion-trigger span:last-child { color: var(--color-link); font-family: var(--font-mono); }
.accordion-panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows var(--dur-long) var(--ease-in-out); }
.accordion-panel > div { overflow: hidden; }
.accordion-panel p, .accordion-panel ul { margin-block: 0 var(--space-lg); color: var(--color-muted); }
.accordion-item:has(.accordion-trigger[aria-expanded="true"]) .accordion-panel { grid-template-rows: 1fr; }

.fit-grid { display: grid; gap: var(--space-md); }
.fit-item {
  display: grid;
  gap: var(--space-sm);
  padding: var(--space-lg);
  color: var(--color-ink-2);
  background: var(--color-paper-3);
  border-block-start: 3px solid var(--color-link);
}
.fit-item p { color: var(--color-muted); }

.download-panel {
  display: grid;
  gap: var(--space-lg);
  padding: var(--space-xl);
  color: var(--color-ink-2);
  background: var(--color-paper-purple);
  border-block-start: 4px solid var(--color-accent);
}
.download-panel p { color: var(--color-muted); }
.download-panel .btn { width: 100%; }

.platform-grid { display: grid; gap: var(--space-lg); }
.platform-card {
  display: grid;
  gap: var(--space-md);
  padding: var(--space-xl);
  color: var(--color-ink-2);
  background: var(--color-paper-2);
  border: var(--rule) solid var(--color-rule);
  border-block-start: 4px solid var(--color-accent);
}
.platform-label { color: var(--color-accent); font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 700; }

.steps { counter-reset: install; display: grid; gap: var(--space-lg); }
.step {
  counter-increment: install;
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: var(--space-md);
  align-items: start;
}
.step::before {
  content: "0" counter(install);
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  color: var(--color-accent-ink);
  background: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 700;
}
.step p { color: var(--color-muted); }

.guide-layout { display: grid; gap: var(--space-xl); }
.toc {
  display: grid;
  gap: var(--space-xs);
  padding: var(--space-md);
  color: var(--color-ink-2);
  background: var(--color-paper-2);
  border: var(--rule) solid var(--color-rule);
}
.toc a { min-height: 40px; display: flex; align-items: center; white-space: nowrap; }
.guide-content { display: grid; gap: var(--space-2xl); min-width: 0; }
.guide-chapter { display: grid; gap: var(--space-lg); scroll-margin-top: 6rem; }
.guide-chapter p, .guide-chapter li { color: var(--color-muted); }
.guide-cards { display: grid; gap: var(--space-md); }
.guide-card {
  display: grid;
  gap: var(--space-sm);
  padding: var(--space-lg);
  color: var(--color-ink-2);
  background: var(--color-paper-2);
  border: var(--rule) solid var(--color-rule);
}
.guide-card a { justify-self: start; white-space: nowrap; }

.lightbox {
  position: fixed;
  inset: 0;
  width: min(94%, 78rem);
  height: fit-content;
  max-height: 92dvh;
  margin: auto;
  padding: 0;
  color: var(--color-ink);
  background: var(--color-paper);
  border: var(--rule) solid var(--color-rule);
  box-shadow: var(--panel-shadow);
}
.lightbox::backdrop { background: var(--color-overlay); }
.lightbox figure { margin: 0; display: grid; }
.lightbox img { width: 100%; max-height: 82dvh; object-fit: contain; background: var(--color-paper); }
.lightbox figcaption { padding: var(--space-sm) var(--space-md); color: var(--color-muted); }
.lightbox-close, .lightbox-prev, .lightbox-next {
  position: absolute;
  z-index: var(--z-raised);
  min-width: 44px;
  min-height: 44px;
  color: var(--color-ink);
  background: var(--color-paper-2);
  border: var(--rule) solid var(--color-rule);
  cursor: pointer;
}
.lightbox-close { inset-block-start: var(--space-sm); inset-inline-end: var(--space-sm); }
.lightbox-prev { inset-block-start: 50%; inset-inline-start: var(--space-sm); }
.lightbox-next { inset-block-start: 50%; inset-inline-end: var(--space-sm); }

.final-cta {
  display: grid;
  gap: var(--space-lg);
  padding-block: var(--space-2xl);
  color: var(--color-ink-2);
  background: var(--color-paper-purple);
  border-block-start: 4px solid var(--color-story);
}
.final-cta__inner { display: grid; gap: var(--space-lg); }
.final-cta__actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); }

.site-footer { padding-block: var(--space-xl); color: var(--color-muted); background: var(--color-paper); }
.footer-line {
  display: grid;
  gap: var(--space-lg);
  padding-block-start: var(--space-lg);
  border-block-start: var(--rule) solid var(--color-rule);
}
.footer-brand { display: grid; gap: var(--space-xs); }
.footer-brand strong { color: var(--color-ink); font-family: var(--font-display); }
.footer-nav, .related-links { display: flex; flex-wrap: wrap; gap: var(--space-xs) var(--space-md); }
.footer-nav a, .related-links a { white-space: nowrap; }
.footer-legal { display: grid; gap: var(--space-xs); font-size: var(--text-xs); }

.sticky-cta {
  position: fixed;
  inset: auto 0 0;
  z-index: var(--z-sticky);
  min-height: 4.75rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) max(var(--page-gutter), env(safe-area-inset-left)) max(var(--space-xs), env(safe-area-inset-bottom));
  color: var(--color-ink-2);
  background: var(--color-paper-2);
  border-block-start: var(--rule) solid var(--color-rule);
  box-shadow: 0 -8px 24px var(--color-shadow);
}
.sticky-cta span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.back-to-top {
  position: fixed;
  inset-inline-end: var(--space-md);
  inset-block-end: 6rem;
  z-index: var(--z-sticky);
  opacity: 0;
  pointer-events: none;
  transform: translateY(var(--space-xs));
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: none; }

.accordion-trigger:active, .gallery-card:active, .nav-link:active, .drawer-link:active, .mega-trigger:active { transform: translateY(2px); }
button:disabled, a[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; }
button[data-state="error"], a[data-state="error"] { outline: 2px solid var(--color-error); outline-offset: 2px; }
button[data-state="success"], a[data-state="success"] { outline: 2px solid var(--color-success); outline-offset: 2px; }

@media (hover: hover) and (pointer: fine) {
  a:hover { color: var(--color-link-hover); }
  .btn:hover { transform: translateY(-1px); background: var(--color-paper-2); }
  .btn--primary:hover { color: var(--color-accent-ink); background: var(--color-accent-hover); }
  .btn--primary:hover::after { transform: skewX(-18deg) translateX(850%); }
  .btn:active { transform: translateY(2px); }
  .btn--primary:active { box-shadow: 0 2px 0 var(--color-accent-ink); }
  .gallery-card:hover img { transform: scale(1.02); }
  .gallery-card:hover .gallery-card__image { border-color: var(--color-link); }
  .filter-tab:hover, .menu-toggle:hover, .icon-button:hover { background: var(--color-paper-3); }
}

@media (min-width: 40rem) {
  .section { padding-block: var(--space-3xl); }
  .hero-actions { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .info-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .gallery-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fit-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .guide-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spec-row { grid-template-columns: minmax(8rem, 0.8fr) minmax(0, 2fr); align-items: baseline; }
  .footer-line { grid-template-columns: minmax(16rem, 1.2fr) minmax(0, 2fr); }
}

@media (min-width: 60rem) {
  body { padding-bottom: 0; }
  .menu-toggle, .mobile-drawer { display: none; }
  .nav-desktop { display: flex; align-items: center; gap: var(--space-xs); }
  .nav-link, .mega-trigger {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding-inline: var(--space-sm);
    color: var(--color-ink-2);
    background: transparent;
    border: 0;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
  }
  .nav-link[aria-current="page"] { color: var(--color-accent); }
  .mega-panel {
    display: block;
    position: absolute;
    inset: 100% 0 auto;
    z-index: var(--z-dropdown);
    color: var(--color-ink-2);
    background: var(--color-paper-2);
    border-block-end: var(--rule) solid var(--color-rule);
    box-shadow: var(--panel-shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-0.6rem);
    transition: opacity var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out), visibility var(--dur-short);
  }
  .mega-panel.is-open { opacity: 1; visibility: visible; transform: none; }
  .mega-inner {
    width: min(100%, var(--page-max));
    margin-inline: auto;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-xl);
    padding: var(--space-xl) var(--page-gutter);
  }
  .mega-col { display: grid; align-content: start; gap: var(--space-xs); }
  .mega-col strong { color: var(--color-ink); font-family: var(--font-display); }
  .mega-col a { display: grid; gap: var(--space-2xs); padding-block: var(--space-xs); text-decoration: none; }
  .mega-col small { color: var(--color-muted); }
  .hero { padding-block: var(--space-xl) var(--space-2xl); }
  .hero-grid { grid-template-columns: minmax(0, 7fr) minmax(20rem, 5fr); align-items: start; }
  .store-summary { min-height: 100%; }
  .story-layout { grid-template-columns: minmax(0, 2fr) minmax(15rem, 0.8fr); align-items: start; }
  .feature-row { grid-template-columns: 4rem minmax(11rem, 0.8fr) minmax(0, 1.7fr); align-items: baseline; }
  .mechanic-map { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .mechanic-node + .mechanic-node::after {
    content: "";
    position: absolute;
    inset: 50% auto auto calc(-1 * var(--space-md));
    width: var(--space-md);
    border-block-start: 2px solid var(--color-story);
  }
  .gallery-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .fit-grid { grid-template-columns: 1.2fr 1fr 0.8fr; }
  .download-panel { grid-template-columns: minmax(0, 1fr) auto; align-items: center; }
  .download-panel .btn { width: auto; }
  .platform-grid { grid-template-columns: minmax(0, 1.35fr) minmax(16rem, 0.65fr); }
  .guide-layout { grid-template-columns: 17rem minmax(0, 1fr); align-items: start; }
  .toc { position: sticky; inset-block-start: 6rem; }
  .guide-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .final-cta__inner { grid-template-columns: minmax(0, 1fr) auto; align-items: end; }
  .sticky-cta { display: none; }
}

@media (min-width: 90rem) {
  :root { --page-max: 84rem; }
  .gallery-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (pointer: coarse) {
  .btn, .filter-tab, .thumb, .menu-toggle, .icon-button { min-height: 48px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 150ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 150ms !important;
  }
  .btn--primary::after { display: none; }
}