/* Hallmark · macrostructure: Catalogue · tone: mature forest storefront · anchor hue: amber
 * pre-emit critique: P5 H5 E5 S5 R4 V5 · contrast: pass (40–41)
 * nav: N6 masthead-store hybrid · footer: Ft3 index columns · slop: pass (42–45)
 * honest: pass (46) · chrome: pass (47) · tokens: pass (48)
 * responsive: pass (34, 49, 50–57) · icons: pass (30)
 */
@import url("./tokens.css");

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; overflow-x: clip; }
html { scroll-behavior: smooth; scroll-padding-top: var(--banner-height); }
body {
  min-width: 20rem;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.72;
  padding-bottom: 0;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration-thickness: 0.08em; text-underline-offset: 0.18em; }
button, input, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
h1, h2, h3, h4 { margin: 0; color: var(--color-ink); font-family: var(--font-display); font-style: normal; line-height: 1.08; overflow-wrap: anywhere; min-width: 0; }
h1 { font-size: var(--text-4xl); }
h2 { font-size: clamp(2rem, 3.5vw, 3.65rem); }
h3 { font-size: var(--text-xl); }
p { margin: 0 0 var(--space-4); }
ul, ol { margin-block: 0 var(--space-5); padding-inline-start: 1.25rem; }
li + li { margin-top: var(--space-2); }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }
::selection { background: var(--color-accent); color: var(--color-accent-ink); }
.skip-link { position: fixed; inset: var(--space-3) auto auto var(--space-3); z-index: 1000; transform: translateY(-180%); background: var(--color-paper-2); color: var(--color-ink); padding: var(--space-3) var(--space-4); border-radius: var(--radius-sm); transition: transform var(--dur-fast) var(--ease-out); }
.skip-link:focus { transform: translateY(0); }
.container { width: min(calc(100% - 2rem), var(--content)); margin-inline: auto; }
.section { padding-block: var(--space-20); }
.section--tight { padding-block: var(--space-12); }
.section--paper { background: var(--color-paper-2); }
.section--dark { background: var(--color-nav); color: var(--color-on-dark); }
.section--dark h2, .section--dark h3, .section--dark a { color: var(--color-on-dark); }
.section-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.72fr); align-items: end; gap: var(--space-8); margin-bottom: var(--space-10); }
.section-head p { margin: 0; color: var(--color-ink-soft); max-width: 42rem; }
.section--dark .section-head p { color: var(--color-paper-3); }
.overline { display: block; margin-bottom: var(--space-2); color: var(--color-forest); font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.11em; text-transform: uppercase; }
.section--dark .overline { color: var(--color-accent); }
.hairline { border-top: var(--rule-thin) solid var(--color-rule); }
.muted { color: var(--color-muted); }
.small { font-size: var(--text-sm); }
.noscript-note { margin: var(--space-3) 0; padding: var(--space-3) var(--space-4); background: var(--color-paper-3); border-left: var(--rule-bold) solid var(--color-berry); }

.promo { background: var(--color-berry-deep); color: var(--color-on-dark); text-align: center; padding: var(--space-2) var(--space-4); font-size: var(--text-sm); }
.promo strong { color: var(--color-accent); }
.site-header { position: sticky; top: 0; z-index: 300; background: var(--color-nav); color: var(--color-on-dark); box-shadow: 0 0.4rem 1.4rem var(--color-shadow-heavy); }
.nav-shell { min-height: 4.6rem; display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: center; gap: var(--space-6); }
.nav-group { display: flex; align-items: center; gap: var(--space-6); }
.nav-group--right { justify-content: flex-end; }
.nav-link { color: var(--color-on-dark); font-size: var(--text-sm); font-weight: 700; text-decoration: none; white-space: nowrap; border-bottom: 2px solid transparent; transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out); }
.nav-link:hover, .nav-link[aria-current="page"] { color: var(--color-accent); border-bottom-color: var(--color-accent); }
.brand { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-3); color: var(--color-on-dark); text-decoration: none; white-space: nowrap; }
.brand-mark { width: 2.35rem; aspect-ratio: 1; display: grid; place-items: center; border: var(--rule-thin) solid var(--color-accent); transform: rotate(45deg); border-radius: var(--radius-xs); }
.brand-mark::before { content: ""; width: 0.75rem; aspect-ratio: 1; background: var(--color-accent); border-radius: 50%; }
.brand-name { font-family: var(--font-display); font-weight: 700; letter-spacing: 0.03em; }
.nav-cta { display: inline-flex; align-items: center; justify-content: center; min-height: 2.75rem; padding: 0 var(--space-5); background: var(--color-accent); color: var(--color-accent-ink); border: var(--rule-thin) solid var(--color-accent); border-radius: var(--radius-xs); font-weight: 800; text-decoration: none; white-space: nowrap; transition: transform var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out); }
.nav-cta:hover { background: var(--color-accent-hover); transform: translateY(-1px); }
.nav-cta:active { background: var(--color-accent-active); transform: translateY(1px); }
.nav-toggle { display: none; width: 2.75rem; min-height: 2.75rem; border: var(--rule-thin) solid var(--color-paper-3); background: transparent; color: var(--color-on-dark); cursor: pointer; border-radius: var(--radius-xs); }
.nav-toggle::before { content: "菜单"; font-size: var(--text-sm); }
.mobile-nav { display: none; background: var(--color-nav-soft); padding: var(--space-4); }
.mobile-nav[hidden] { display: none; }
.mobile-nav a { display: block; color: var(--color-on-dark); padding: var(--space-3) var(--space-2); font-weight: 700; text-decoration: none; white-space: nowrap; }

.hero { background: var(--color-nav); color: var(--color-on-dark); padding-block: var(--space-8) var(--space-16); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.72fr) minmax(18rem, 0.78fr); gap: var(--space-6); align-items: stretch; }
.hero-media { position: relative; min-height: 31rem; overflow: hidden; border-radius: var(--radius-sm); background: var(--color-nav-soft); box-shadow: 0 1.2rem 3.2rem var(--color-shadow-heavy); }
.hero-media > img { width: 100%; height: 100%; object-fit: cover; object-position: center; transform: scale(1.025); animation: hero-breathe 16s var(--ease-in-out) infinite alternate; }
.hero-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 25%, var(--color-shadow-heavy) 76%, var(--color-nav) 112%); }
.hero-copy { position: absolute; z-index: 2; inset: auto var(--space-8) var(--space-8); max-width: 48rem; }
.hero h1 { color: var(--color-on-dark); max-width: 12ch; text-shadow: 0 0.15rem 1rem var(--color-shadow-heavy); }
.hero-title-sub { display: block; margin-top: var(--space-2); font-family: var(--font-body); font-size: var(--text-sm); font-weight: 600; color: var(--color-paper-3); letter-spacing: 0.04em; }
.hero-lede { max-width: 44rem; margin: var(--space-4) 0 0; font-size: var(--text-lg); line-height: 1.55; color: var(--color-on-dark); }
.product-panel { display: flex; flex-direction: column; min-width: 0; background: var(--color-paper-2); color: var(--color-ink); border-radius: var(--radius-sm); overflow: hidden; box-shadow: 0 1.2rem 3.2rem var(--color-shadow-heavy); }
.product-panel__logo { background: var(--color-ink); aspect-ratio: 460 / 215; overflow: hidden; }
.product-panel__logo img { width: 100%; height: 100%; object-fit: cover; }
.product-panel__body { display: flex; flex: 1; flex-direction: column; padding: var(--space-5); }
.tag-row { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-4); }
.tag { display: inline-flex; min-height: 1.85rem; align-items: center; padding: 0 var(--space-3); border: var(--rule-thin) solid var(--color-rule); border-radius: var(--radius-round); color: var(--color-ink-soft); background: var(--color-paper); font-size: var(--text-xs); font-weight: 800; white-space: nowrap; }
.product-panel__pitch { color: var(--color-ink-soft); line-height: 1.58; }
.mini-facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-2); margin-block: auto var(--space-5); }
.mini-facts div { padding-block: var(--space-3); border-top: var(--rule-thin) solid var(--color-rule); }
.mini-facts dt { color: var(--color-muted); font-size: var(--text-xs); }
.mini-facts dd { margin: 0; font-weight: 800; }
.button-row { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.button { position: relative; display: inline-flex; min-height: 3rem; align-items: center; justify-content: center; gap: var(--space-2); padding: 0 var(--space-5); border: var(--rule-thin) solid var(--color-ink); border-radius: var(--radius-xs); background: var(--color-paper-2); color: var(--color-ink); cursor: pointer; font-weight: 800; text-decoration: none; white-space: nowrap; transition: transform var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out); }
.button:hover, .button.is-hover { transform: translateY(-2px); box-shadow: 0 0.45rem 0 var(--color-shadow); }
.button:active, .button.is-active { transform: translateY(1px); box-shadow: none; }
.button--primary { background: var(--color-accent); color: var(--color-accent-ink); border-color: var(--color-accent); }
.button--primary:hover, .button--primary.is-hover { background: var(--color-accent-hover); }
.button--primary:active, .button--primary.is-active { background: var(--color-accent-active); }
.button[aria-disabled="true"], .button:disabled { opacity: 0.55; cursor: not-allowed; pointer-events: none; }
.button[data-state="loading"] { cursor: wait; }
.button[data-state="loading"]::after { content: ""; width: 0.8rem; aspect-ratio: 1; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin 0.7s linear infinite; }
.button[data-state="error"] { background: var(--color-error); color: var(--color-on-dark); border-color: var(--color-error); }
.button[data-state="success"] { background: var(--color-success); color: var(--color-on-dark); border-color: var(--color-success); }

.fact-strip { margin-top: calc(var(--space-8) * -1); position: relative; z-index: 4; }
.fact-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); background: var(--color-paper-2); border: var(--rule-thin) solid var(--color-rule); box-shadow: 0 0.8rem 2.2rem var(--color-shadow); }
.fact-item { padding: var(--space-5); border-right: var(--rule-thin) solid var(--color-rule); }
.fact-item:last-child { border-right: 0; }
.fact-item span { display: block; color: var(--color-muted); font-size: var(--text-xs); }
.fact-item strong { display: block; margin-top: var(--space-1); font-size: var(--text-base); }

.store-layout { display: grid; grid-template-columns: minmax(0, 1.52fr) minmax(17rem, 0.58fr); gap: var(--space-10); align-items: start; }
.prose { max-width: 48rem; }
.prose h2, .prose h3 { margin-top: var(--space-10); margin-bottom: var(--space-4); }
.prose p { color: var(--color-ink-soft); }
.notice { padding: var(--space-5); background: var(--color-paper-3); border-left: var(--rule-bold) solid var(--color-berry); }
.notice strong { display: block; margin-bottom: var(--space-2); color: var(--color-berry-deep); }
.side-index { position: sticky; top: calc(var(--banner-height) + var(--space-5)); background: var(--color-paper-2); border-top: var(--rule-bold) solid var(--color-forest); padding: var(--space-6); }
.side-index h2 { font-family: var(--font-body); font-size: var(--text-base); }
.side-index ol { list-style: none; padding: 0; margin: var(--space-4) 0 0; }
.side-index a { display: flex; justify-content: space-between; gap: var(--space-4); padding: var(--space-3) 0; border-bottom: var(--rule-thin) solid var(--color-rule); color: var(--color-ink-soft); text-decoration: none; }
.side-index a:hover { color: var(--color-forest); }

.feature-ledger { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: var(--rule-thin) solid var(--color-rule); border-left: var(--rule-thin) solid var(--color-rule); }
.feature { min-width: 0; padding: var(--space-8); border-right: var(--rule-thin) solid var(--color-rule); border-bottom: var(--rule-thin) solid var(--color-rule); background: var(--color-paper-2); }
.feature:nth-child(3n + 1) { background: var(--color-paper-3); }
.feature-code { display: inline-grid; place-items: center; width: 2.5rem; aspect-ratio: 1; margin-bottom: var(--space-5); background: var(--color-forest); color: var(--color-on-dark); font-family: var(--font-mono); font-size: var(--text-xs); }
.feature p { margin: var(--space-3) 0 0; color: var(--color-ink-soft); }

.gallery-stage { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(14rem, 0.55fr); gap: var(--space-4); }
.gallery-main { position: relative; min-width: 0; overflow: hidden; background: var(--color-nav); border-radius: var(--radius-sm); }
.gallery-main a { display: block; }
.gallery-main img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.gallery-caption { position: absolute; inset: auto 0 0; padding: var(--space-5); background: linear-gradient(180deg, transparent, var(--color-nav)); color: var(--color-on-dark); pointer-events: none; }
.thumb-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
.thumb { padding: 0; border: var(--rule-bold) solid transparent; background: var(--color-nav); cursor: pointer; overflow: hidden; border-radius: var(--radius-xs); transition: border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out); }
.thumb:hover { transform: translateY(-2px); }
.thumb.is-active { border-color: var(--color-accent); }
.thumb img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }

.lightbox { width: min(96vw, 76rem); max-width: none; padding: 0; border: 0; background: transparent; color: var(--color-on-dark); }
.lightbox::backdrop { background: var(--color-nav); opacity: 0.94; }
.lightbox__frame { position: relative; display: grid; min-height: 80vh; place-items: center; }
.lightbox__image { max-width: 100%; max-height: 78vh; object-fit: contain; box-shadow: 0 1rem 3rem var(--color-shadow-heavy); }
.lightbox__close, .lightbox__prev, .lightbox__next { position: absolute; z-index: 2; min-width: 3rem; min-height: 3rem; border: var(--rule-thin) solid var(--color-paper-3); background: var(--color-nav); color: var(--color-on-dark); cursor: pointer; }
.lightbox__close { top: 0; right: 0; }
.lightbox__prev { left: 0; top: 50%; }
.lightbox__next { right: 0; top: 50%; }
.lightbox__status { position: absolute; inset: auto 0 0; padding: var(--space-3); text-align: center; background: var(--color-nav); }

.review-band { display: grid; grid-template-columns: minmax(13rem, 0.48fr) minmax(0, 1.52fr); border: var(--rule-thin) solid var(--color-rule); }
.review-score { padding: var(--space-8); background: var(--color-forest-deep); color: var(--color-on-dark); }
.review-score strong { display: block; color: var(--color-on-dark); font-family: var(--font-display); font-size: clamp(2rem, 4vw, 4rem); line-height: 1; }
.review-score span { display: block; margin-top: var(--space-3); color: var(--color-paper-3); }
.audience-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.audience-card { padding: var(--space-6); border-left: var(--rule-thin) solid var(--color-rule); background: var(--color-paper-2); }
.audience-card h3 { font-family: var(--font-body); font-size: var(--text-base); }
.audience-card p { margin-top: var(--space-3); color: var(--color-ink-soft); }

.download-band { position: relative; overflow: hidden; background: var(--color-forest-deep); color: var(--color-on-dark); padding: var(--space-12); }
.download-band::after { content: ""; position: absolute; width: 16rem; aspect-ratio: 1; right: -5rem; top: -8rem; border: 2rem solid var(--color-lake); border-radius: 50%; opacity: 0.45; }
.download-band h2 { color: var(--color-on-dark); max-width: 18ch; }
.download-band p { max-width: 44rem; color: var(--color-paper-3); }
.download-band .button-row { margin-top: var(--space-6); }

.faq-list { border-top: var(--rule-thin) solid var(--color-rule); }
.faq-list details { border-bottom: var(--rule-thin) solid var(--color-rule); background: var(--color-paper-2); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); cursor: pointer; list-style: none; padding: var(--space-5) var(--space-6); font-weight: 800; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; color: var(--color-forest); font-size: var(--text-2xl); }
.faq-list details[open] summary::after { content: "−"; }
.faq-answer { padding: 0 var(--space-6) var(--space-6); color: var(--color-ink-soft); max-width: 54rem; }

.page-hero { position: relative; background: var(--color-nav); color: var(--color-on-dark); padding-block: var(--space-12) var(--space-20); overflow: hidden; }
.page-hero::after { content: ""; position: absolute; width: 22rem; height: 22rem; right: -6rem; top: -9rem; border: 4rem solid var(--color-forest); transform: rotate(18deg); opacity: 0.42; }
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { max-width: 18ch; color: var(--color-on-dark); }
.page-hero p { max-width: 46rem; margin-top: var(--space-5); color: var(--color-paper-3); font-size: var(--text-lg); }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-8); font-size: var(--text-sm); color: var(--color-paper-3); }
.breadcrumbs a { white-space: nowrap; }

.filter-bar { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-8); }
.filter-button { min-height: 2.75rem; padding: 0 var(--space-4); border: var(--rule-thin) solid var(--color-ink); background: var(--color-paper-2); color: var(--color-ink); cursor: pointer; border-radius: var(--radius-round); font-weight: 800; white-space: nowrap; }
.filter-button:hover, .filter-button[aria-pressed="true"] { background: var(--color-ink); color: var(--color-on-dark); }
.filter-button:disabled { opacity: 0.55; cursor: not-allowed; }
.gallery-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-5); }
.gallery-card { min-width: 0; background: var(--color-paper-2); border: var(--rule-thin) solid var(--color-rule); }
.gallery-card[hidden] { display: none; }
.gallery-card a { display: block; overflow: hidden; }
.gallery-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; transition: transform var(--dur-slow) var(--ease-out); }
.gallery-card:hover img { transform: scale(1.025); }
.gallery-card figcaption { padding: var(--space-4); color: var(--color-ink-soft); }

.download-card-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(16rem, 0.7fr); gap: var(--space-6); }
.platform-card { padding: var(--space-8); background: var(--color-paper-2); border: var(--rule-thin) solid var(--color-rule); border-top: var(--rule-bold) solid var(--color-accent); }
.platform-card h2 { font-size: var(--text-3xl); }
.platform-card .button { margin-top: var(--space-4); }
.spec-list { margin: var(--space-5) 0; padding: 0; list-style: none; }
.spec-list li { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: var(--space-3); padding-block: var(--space-3); border-bottom: var(--rule-thin) solid var(--color-rule); }
.spec-list strong { color: var(--color-muted); font-size: var(--text-sm); }
.steps { counter-reset: steps; list-style: none; padding: 0; }
.steps li { counter-increment: steps; display: grid; grid-template-columns: 3.25rem minmax(0, 1fr); gap: var(--space-5); padding-block: var(--space-6); border-bottom: var(--rule-thin) solid var(--color-rule); }
.steps li::before { content: counter(steps, decimal-leading-zero); display: grid; place-items: center; width: 3.25rem; height: 3.25rem; background: var(--color-forest); color: var(--color-on-dark); font-family: var(--font-mono); font-weight: 800; }
.steps h3 { margin-bottom: var(--space-2); }
.config-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-5); }
.config-card { padding: var(--space-6); background: var(--color-paper-2); border: var(--rule-thin) solid var(--color-rule); }
.config-card h3 { margin-bottom: var(--space-5); }
.config-card dl { margin: 0; }
.config-card dl div { display: grid; grid-template-columns: 6rem minmax(0, 1fr); gap: var(--space-3); padding: var(--space-2) 0; border-top: var(--rule-thin) solid var(--color-rule); }
.config-card dt { color: var(--color-muted); }
.config-card dd { margin: 0; }

.guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
.guide-card { display: grid; grid-template-columns: 3.5rem minmax(0, 1fr); gap: var(--space-4); padding: var(--space-6); background: var(--color-paper-2); border: var(--rule-thin) solid var(--color-rule); text-decoration: none; }
.guide-card:hover { border-color: var(--color-forest); }
.guide-card__code { display: grid; place-items: center; width: 3.5rem; height: 3.5rem; background: var(--color-berry-deep); color: var(--color-on-dark); font-family: var(--font-mono); }
.guide-card p { margin: var(--space-2) 0 0; color: var(--color-ink-soft); }
.guide-section { padding-block: var(--space-10); border-bottom: var(--rule-thin) solid var(--color-rule); }
.guide-section h2 { margin-bottom: var(--space-6); }
.guide-section h3 { margin: var(--space-6) 0 var(--space-3); }
.decision-table { width: 100%; border-collapse: collapse; background: var(--color-paper-2); }
.decision-table th, .decision-table td { padding: var(--space-4); border: var(--rule-thin) solid var(--color-rule); text-align: left; vertical-align: top; }
.decision-table th { background: var(--color-forest-deep); color: var(--color-on-dark); }

.final-cta { display: grid; grid-template-columns: minmax(0, 1.3fr) auto; align-items: end; gap: var(--space-8); background: var(--color-berry-deep); color: var(--color-on-dark); padding: var(--space-10); }
.final-cta h2 { color: var(--color-on-dark); }
.final-cta p { max-width: 48rem; margin: var(--space-3) 0 0; color: var(--color-paper-3); }
.final-cta small { display: block; margin-top: var(--space-4); color: var(--color-paper-3); }

.site-footer { background: var(--color-nav); color: var(--color-on-dark); padding-block: var(--space-16) var(--space-8); }
.footer-grid { display: grid; grid-template-columns: minmax(16rem, 1.2fr) repeat(2, minmax(10rem, 0.8fr)); gap: var(--space-10); }
.site-footer h2, .site-footer h3 { color: var(--color-on-dark); }
.site-footer h2 { font-size: var(--text-2xl); }
.site-footer h3 { font-family: var(--font-body); font-size: var(--text-sm); color: var(--color-accent); }
.site-footer p, .site-footer small { color: var(--color-paper-3); }
.footer-links { list-style: none; padding: 0; margin: var(--space-4) 0 0; }
.footer-links a { display: inline-block; color: var(--color-on-dark); padding-block: var(--space-1); white-space: nowrap; }
.footer-bottom { margin-top: var(--space-12); padding-top: var(--space-6); border-top: var(--rule-thin) solid var(--color-nav-soft); display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-4); }
.back-top { position: fixed; z-index: 120; right: var(--space-4); bottom: var(--space-4); min-width: 3rem; height: 3rem; border: 0; background: var(--color-nav); color: var(--color-on-dark); cursor: pointer; box-shadow: 0 0.5rem 1.2rem var(--color-shadow); opacity: 0; pointer-events: none; transform: translateY(0.5rem); transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out); }
.back-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.mobile-download { display: none; }

@keyframes hero-breathe { to { transform: scale(1.05); } }
@keyframes spin { to { transform: rotate(1turn); } }

@media (max-width: 64rem) {
  :root { --banner-height: 6.2rem; }
  .nav-shell { grid-template-columns: auto minmax(0, 1fr) auto; }
  .nav-group { display: none; }
  .nav-toggle { display: inline-grid; place-items: center; }
  .brand { justify-self: center; }
  .mobile-nav.is-open { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .hero-grid, .store-layout, .download-card-grid { grid-template-columns: minmax(0, 1fr); }
  .hero-media { min-height: 27rem; }
  .product-panel { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); }
  .product-panel__logo { aspect-ratio: auto; }
  .side-index { position: static; }
  .gallery-stage { grid-template-columns: minmax(0, 1fr); }
  .thumb-list { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .gallery-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 48rem) {
  :root { --banner-height: 6.15rem; }
  body { padding-bottom: 4.7rem; }
  .promo { font-size: 0.7rem; }
  .nav-shell { min-height: 4.25rem; }
  .nav-cta { display: none; }
  .section { padding-block: var(--space-12); }
  .section-head { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .hero { padding-block: var(--space-4) var(--space-12); }
  .hero-media { min-height: 26rem; }
  .hero-copy { inset: auto var(--space-5) var(--space-5); }
  .hero-lede { font-size: var(--text-base); }
  .product-panel { display: flex; }
  .product-panel__logo { aspect-ratio: 460 / 215; }
  .fact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fact-item:nth-child(2) { border-right: 0; }
  .fact-item:nth-child(-n+2) { border-bottom: var(--rule-thin) solid var(--color-rule); }
  .feature-ledger, .review-band, .guide-grid, .config-grid, .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .audience-grid { grid-template-columns: minmax(0, 1fr); }
  .audience-card { border-left: 0; border-top: var(--rule-thin) solid var(--color-rule); }
  .gallery-grid { grid-template-columns: minmax(0, 1fr); }
  .mobile-nav.is-open { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .final-cta { grid-template-columns: minmax(0, 1fr); padding: var(--space-8) var(--space-5); }
  .mobile-download { position: fixed; z-index: 250; inset: auto 0 0; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--space-3); align-items: center; padding: var(--space-3) var(--space-4); background: var(--color-nav); color: var(--color-on-dark); box-shadow: 0 -0.4rem 1.4rem var(--color-shadow-heavy); }
  .mobile-download span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: var(--text-sm); }
  .mobile-download .button { min-height: 2.75rem; }
  .back-top { bottom: 5.4rem; }
}

@media (max-width: 26rem) {
  .container { width: min(calc(100% - 1.25rem), var(--content)); }
  .brand-name { font-size: var(--text-sm); }
  .hero-media { min-height: 24rem; }
  .hero-copy { inset: auto var(--space-4) var(--space-4); }
  .hero h1 { font-size: 2.3rem; }
  .button-row { display: grid; grid-template-columns: minmax(0, 1fr); }
  .button-row .button { width: 100%; }
  .thumb-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spec-list li, .config-card dl div { grid-template-columns: minmax(0, 1fr); gap: var(--space-1); }
  .decision-table { font-size: var(--text-sm); }
  .decision-table th, .decision-table td { padding: var(--space-2); }
  .mobile-download span { display: none; }
  .mobile-download { grid-template-columns: minmax(0, 1fr); }
}

@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-media > img { transform: none; }
}