/* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V5
 * genre: editorial · macrostructure: Feature Stack · theme: custom
 * vibe: 夏日和纸、严格网格、朱红印章、浴场绘卷 · enrichment: E8 verified game still
 * nav: N10 floating-on-scroll morph · footer: Ft2 inline-rule single line
 * axes: light / roman-serif / cool-blue with vermilion signal
 * contrast: pass (40–41) · nav/footer/hero: pass (42–45) · honest/chrome/tokens/icons: pass (30, 46–48)
 * slop: pass (1–58) · mobile: pass (34, 49, 50–57)
 */
@import url("../../tokens.css");

*, *::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; overflow-x: clip; background: var(--color-paper); color: var(--color-ink); font-family: var(--font-body); font-size: var(--text-base); line-height: 1.68; }
body.is-locked { overflow: hidden; }
img, video { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration-thickness: var(--rule-hair); text-underline-offset: var(--space-2xs); }
button, a, summary { -webkit-tap-highlight-color: transparent; }
button, input { font: inherit; }
a:hover { color: var(--color-signal); }
a:focus-visible, button:focus-visible { outline: var(--rule-strong) solid var(--color-focus); outline-offset: var(--space-2xs); }
a:active:not(.button) { color: var(--color-signal-dark); }
button:active:not(:disabled) { transform: translateY(var(--space-3xs)); }
button:disabled, [aria-disabled="true"] { cursor: not-allowed; opacity: .55; }
h1, h2, h3, p, figure, blockquote, dl, dd { margin: 0; }
h1, h2, h3 { color: var(--color-ink-strong); font-family: var(--font-display); font-style: normal; font-weight: 700; letter-spacing: -0.035em; line-height: 1.18; overflow-wrap: anywhere; min-width: 0; }
ul, ol { margin: 0; padding: 0; }
li { list-style: none; }
table { border-collapse: collapse; width: 100%; }

.skip-link { position: fixed; inset: var(--space-sm) auto auto var(--space-sm); z-index: var(--z-tooltip); padding: var(--space-sm) var(--space-md); background: var(--color-ink-strong); color: var(--color-on-dark); transform: translateY(-180%); }
.skip-link:focus { transform: none; }
.shell { width: min(100%, var(--content-max)); margin-inline: auto; padding-inline: var(--page-gutter); }
.reading { width: min(100%, var(--reading-max)); }
.section { padding-block: var(--space-3xl); position: relative; }
.section--warm { background: var(--color-paper-warm); }
.section--deep { background: var(--color-ink-strong); color: var(--color-on-dark); }
.section--rule { border-top: var(--rule-hair) solid var(--color-rule); }
.section-head { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: var(--space-2xl); align-items: end; margin-block-end: var(--space-2xl); }
.section-head h2 { font-size: clamp(2rem, 5vw, 4.25rem); max-width: 13ch; }
.section-head p { max-width: 48ch; justify-self: end; }
.chapter-mark { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: .14em; text-transform: uppercase; color: var(--color-signal); }
.kicker { display: inline-flex; align-items: center; gap: var(--space-xs); font-size: var(--text-sm); font-weight: 700; color: var(--color-ink-strong); }
.kicker::before { content: ""; width: 1.8rem; height: var(--rule-strong); background: var(--color-signal); }
.muted { color: var(--color-muted); }
.tnum { font-variant-numeric: tabular-nums; }
.vertical-note { writing-mode: vertical-rl; text-orientation: mixed; letter-spacing: .18em; font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-muted); }

.site-nav { position: fixed; inset: 0 0 auto; z-index: var(--z-sticky); height: var(--nav-height); pointer-events: none; }
.nav-inner { pointer-events: auto; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: var(--space-lg); width: 100%; height: var(--nav-height); padding-inline: var(--page-gutter); background: color-mix(in oklch, var(--color-paper) 92%, transparent); border-bottom: var(--rule-hair) solid var(--color-rule); transition: transform var(--dur-long) var(--ease-in-out), background-color var(--dur-long) var(--ease-in-out), border-color var(--dur-long) var(--ease-in-out); }
.site-nav.is-floating .nav-inner { width: min(calc(100% - var(--space-xl)), 62rem); margin-inline: auto; transform: translateY(var(--space-md)); background: color-mix(in oklch, var(--color-paper-warm) 91%, transparent); border: var(--rule-hair) solid var(--color-rule-strong); border-radius: var(--radius-pill); box-shadow: 0 var(--space-xs) var(--space-xl) var(--color-shadow-soft); padding-inline: var(--space-lg); }
.brand { display: inline-flex; align-items: center; gap: var(--space-sm); text-decoration: none; white-space: nowrap; }
.brand-mark { display: grid; place-items: center; width: 2rem; aspect-ratio: 1; border: var(--rule-strong) solid var(--color-signal); color: var(--color-signal); font-family: var(--font-display); font-weight: 700; transform: rotate(-4deg); }
.brand-name { font-family: var(--font-display); font-size: var(--text-md); font-weight: 700; color: var(--color-ink-strong); }
.nav-links { display: flex; justify-content: center; gap: clamp(var(--space-sm), 2vw, var(--space-xl)); }
.nav-links a, .nav-download, .menu-toggle { white-space: nowrap; text-decoration: none; font-weight: 700; font-size: var(--text-sm); line-height: 1; }
.nav-links a { position: relative; padding-block: var(--space-xs); }
.nav-links a::after { content: ""; position: absolute; inset: auto 0 0; height: var(--rule-strong); background: var(--color-signal); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-short) var(--ease-out); }
.nav-links a:hover::after, .nav-links a:focus-visible::after, .nav-links a[aria-current="page"]::after { transform: scaleX(1); }
.menu-toggle { display: none; border: 0; background: transparent; color: var(--color-ink-strong); padding: var(--space-sm); }

.button { position: relative; isolation: isolate; display: inline-flex; align-items: center; justify-content: center; min-height: 3rem; padding: var(--space-sm) var(--space-lg); border: var(--rule-strong) solid var(--color-ink-strong); border-radius: var(--radius-xs); background: var(--color-ink-strong); color: var(--color-on-dark); font-weight: 800; line-height: 1; text-decoration: none; white-space: nowrap; overflow: hidden; transition: transform var(--dur-micro) var(--ease-out), background-color var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out), border-color var(--dur-short) var(--ease-out); }
.button::after { content: ""; position: absolute; z-index: -1; inset: -25% auto -25% -18%; width: 10%; background: color-mix(in oklch, var(--color-on-dark) 65%, transparent); transform: skewX(-16deg) translateX(-250%); transition: transform var(--dur-long) var(--ease-out); }
.button:hover::after, .button:focus-visible::after { transform: skewX(-16deg) translateX(1350%); }
.button:hover, .button.is-hover { color: var(--color-on-dark); }
.button:active, .button.is-active { transform: translateY(1px); }
.button:focus-visible, .button.is-focus { outline: var(--rule-strong) solid var(--color-focus); outline-offset: var(--space-2xs); }
.button[aria-disabled="true"], .button.is-disabled { pointer-events: none; color: var(--color-muted); background: var(--color-disabled); border-color: var(--color-disabled); }
.button.is-loading { cursor: wait; color: transparent; }
.button.is-loading::before { content: ""; position: absolute; width: 1rem; aspect-ratio: 1; border: var(--rule-strong) solid var(--color-on-dark); border-inline-end-color: transparent; border-radius: 50%; animation: spin 800ms linear infinite; }
.button.is-success { background: var(--color-success); border-color: var(--color-success); }
.button.is-error { background: var(--color-error); border-color: var(--color-error); }
.button--ghost { background: transparent; color: var(--color-ink-strong); }
.button--ghost:hover, .button--ghost.is-hover { background: var(--color-paper-warm); color: var(--color-ink-strong); border-color: var(--color-signal); }
.hero .button--ghost, .final-cta .button--ghost { color: var(--color-on-dark); border-color: var(--color-on-dark); }
.hero .button--ghost:hover, .hero .button--ghost:focus-visible, .final-cta .button--ghost:hover, .final-cta .button--ghost:focus-visible { background: var(--color-paper-warm); color: var(--color-ink-strong); border-color: var(--color-paper-warm); }
.hero a:focus-visible, .final-cta a:focus-visible { outline-color: var(--color-highlight); }
.button--large { min-height: 3.75rem; padding-inline: var(--space-xl); font-size: var(--text-md); }
@keyframes spin { to { transform: rotate(1turn); } }

.hero { position: relative; min-height: 45rem; padding-block: calc(var(--nav-height) + var(--space-lg)) var(--space-4xl); background: var(--color-ink-strong); color: var(--color-on-dark); overflow: clip; }
.hero-media { position: absolute; inset: 0 0 0 38%; }
.hero-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, var(--color-ink-strong), color-mix(in oklch, var(--color-ink-strong) 30%, transparent)); }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: 48% center; filter: saturate(.82) contrast(.96); }
.hero-grid { position: relative; z-index: var(--z-raised); display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: var(--space-2xl); min-height: 31rem; align-items: end; }
.hero-copy { display: grid; gap: var(--space-lg); align-self: center; }
.hero h1 { color: var(--color-on-dark); font-size: var(--text-display); max-width: 9ch; text-shadow: 0 var(--space-2xs) var(--space-lg) var(--color-shadow); }
.hero h1 span { display: block; font-family: var(--font-body); font-size: .26em; letter-spacing: .12em; text-transform: uppercase; margin-block-start: var(--space-sm); color: var(--color-accent-soft); }
.hero-lede { max-width: 54ch; font-size: var(--text-md); color: var(--color-on-dark); }
.tag-row, .cta-row { display: flex; flex-wrap: wrap; gap: var(--space-sm); align-items: center; }
.tag { display: inline-flex; align-items: center; padding: var(--space-2xs) var(--space-xs); border: var(--rule-hair) solid color-mix(in oklch, var(--color-on-dark) 58%, transparent); border-radius: var(--radius-pill); color: var(--color-on-dark); font-size: var(--text-sm); line-height: 1; white-space: nowrap; }
.hero-facts { align-self: end; border-inline-start: var(--rule-hair) solid color-mix(in oklch, var(--color-on-dark) 42%, transparent); padding-inline-start: var(--space-xl); display: grid; gap: var(--space-lg); }
.hero-fact dt { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: .1em; text-transform: uppercase; color: var(--color-accent-soft); }
.hero-fact dd { margin-block-start: var(--space-2xs); font-family: var(--font-display); font-size: var(--text-xl); color: var(--color-on-dark); }
.hero-note { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--space-md); align-items: end; }
.hero .vertical-note { color: var(--color-accent-soft); }

.petals { position: absolute; inset: 0; pointer-events: none; z-index: var(--z-base); }
.petal { position: absolute; width: .45rem; height: .85rem; background: var(--color-signal); border-radius: 70% 30% 70% 30%; opacity: .38; animation: petal-drift 18s var(--ease-in-out) infinite; }
.petal:nth-child(1) { inset: 14% auto auto 72%; }
.petal:nth-child(2) { inset: 28% auto auto 87%; animation-delay: -6s; }
.petal:nth-child(3) { inset: 9% auto auto 55%; animation-delay: -12s; }
@keyframes petal-drift { 0% { transform: translate3d(0, -2rem, 0) rotate(0); opacity: 0; } 18%, 82% { opacity: .38; } 100% { transform: translate3d(-4rem, 24rem, 0) rotate(140deg); opacity: 0; } }

.info-ledger { position: relative; z-index: var(--z-raised); margin-block-start: calc(var(--space-xl) * -1); }
.ledger-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); background: var(--color-paper-warm); border: var(--rule-hair) solid var(--color-rule-strong); box-shadow: 0 var(--space-xs) var(--space-xl) var(--color-shadow-soft); }
.ledger-item { padding: var(--space-lg); border-inline-end: var(--rule-hair) solid var(--color-rule); min-width: 0; }
.ledger-item:last-child { border-inline-end: 0; }
.ledger-item dt { font-size: var(--text-xs); color: var(--color-muted); }
.ledger-item dd { margin-block-start: var(--space-xs); font-weight: 800; color: var(--color-ink-strong); overflow-wrap: anywhere; }

.spread { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 0; border-block: var(--rule-hair) solid var(--color-rule); background: var(--color-paper-raised); }
.spread-copy { padding: var(--space-3xl) clamp(var(--space-lg), 5vw, var(--space-3xl)); display: grid; align-content: center; gap: var(--space-lg); }
.spread-copy p { max-width: 48ch; }
.spread-copy p:first-of-type::first-letter { float: left; font-family: var(--font-display); font-size: 4.2rem; line-height: .8; padding-inline-end: var(--space-xs); color: var(--color-signal); }
.spread-visual { position: relative; min-height: 34rem; }
.spread-visual img { width: 100%; height: 100%; object-fit: cover; }
.spread-visual figcaption { position: absolute; inset: auto var(--space-md) var(--space-md) auto; background: var(--color-paper-warm); color: var(--color-ink-strong); padding: var(--space-sm) var(--space-md); font-family: var(--font-mono); font-size: var(--text-xs); max-width: 24rem; }

.feature-stack { display: grid; grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr); gap: var(--space-3xl); align-items: start; }
.feature-index { position: sticky; top: calc(var(--nav-height) + var(--space-2xl)); display: grid; gap: var(--space-xl); }
.feature-index h2 { font-size: clamp(2.25rem, 5vw, 4.6rem); max-width: 8ch; }
.feature-links { display: grid; border-top: var(--rule-hair) solid var(--color-rule); }
.feature-links a { display: grid; grid-template-columns: 2.5rem minmax(0, 1fr); gap: var(--space-sm); padding-block: var(--space-sm); border-bottom: var(--rule-hair) solid var(--color-rule); text-decoration: none; }
.feature-links a:hover, .feature-links a:focus-visible { color: var(--color-signal); }
.feature-scroll { display: grid; gap: var(--space-2xl); }
.feature-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .72fr); gap: var(--space-xl); align-items: center; border-top: var(--rule-strong) solid var(--color-ink-strong); padding-block-start: var(--space-lg); }
.feature-panel:nth-child(even) { grid-template-columns: minmax(0, .72fr) minmax(0, 1fr); }
.feature-panel:nth-child(even) .feature-panel-copy { order: 2; }
.feature-panel h3 { font-size: var(--text-2xl); }
.feature-panel-copy { display: grid; gap: var(--space-sm); }
.feature-panel figure { aspect-ratio: 16 / 10; overflow: hidden; background: var(--color-paper-deep); }
.feature-panel img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-long) var(--ease-out); }
.feature-panel:hover img, .feature-panel:focus-within img { transform: scale(1.015); }

.gallery-ribbon { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--space-sm); }
.gallery-card { grid-column: span 4; position: relative; border: 0; padding: 0; background: var(--color-paper-warm); cursor: zoom-in; overflow: hidden; aspect-ratio: 16 / 10; }
.gallery-card:first-child { grid-column: span 7; grid-row: span 2; }
.gallery-card:nth-child(2) { grid-column: span 5; }
.gallery-card:nth-child(3) { grid-column: span 5; }
.gallery-card img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-short) var(--ease-out); }
.gallery-card:hover img, .gallery-card:focus-visible img { transform: scale(1.025); }
.gallery-card:focus-visible { outline: var(--rule-strong) solid var(--color-focus); outline-offset: var(--space-2xs); }
.gallery-caption { position: absolute; inset: auto 0 0; padding: var(--space-sm) var(--space-md); color: var(--color-on-dark); background: color-mix(in oklch, var(--color-ink-strong) 86%, transparent); text-align: left; font-size: var(--text-sm); }

.tabs { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-xs); margin-block-end: var(--space-xl); }
.tab { min-height: 2.75rem; border: var(--rule-hair) solid var(--color-rule-strong); background: var(--color-paper); color: var(--color-ink-strong); padding: var(--space-xs) var(--space-md); font-weight: 700; line-height: 1; white-space: nowrap; cursor: pointer; }
.tab[aria-selected="true"] { background: var(--color-ink-strong); color: var(--color-on-dark); border-color: var(--color-ink-strong); }
.tab:hover { border-color: var(--color-signal); }
.tab:focus-visible { outline: var(--rule-strong) solid var(--color-focus); outline-offset: var(--space-2xs); }
.gallery-page-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-md); }
.gallery-page-grid .gallery-card { grid-column: auto; grid-row: auto; }
.gallery-card[hidden] { display: none; }

.download-band { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--space-2xl); align-items: center; padding: var(--space-2xl); border: var(--rule-strong) solid var(--color-ink-strong); background: var(--color-highlight); }
.download-band h2 { font-size: clamp(2rem, 5vw, 4rem); max-width: 13ch; }
.download-band p { margin-block-start: var(--space-sm); max-width: 50ch; }

.timeline { border-top: var(--rule-strong) solid var(--color-ink-strong); }
.timeline article { display: grid; grid-template-columns: minmax(8rem, .35fr) minmax(0, 1fr); gap: var(--space-xl); padding-block: var(--space-xl); border-bottom: var(--rule-hair) solid var(--color-rule); }
.timeline time, .timeline .version { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-signal); }
.timeline h3 { font-size: var(--text-xl); margin-block-end: var(--space-xs); }

.review-summary { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: var(--space-3xl); align-items: start; }
.review-score { border-top: var(--rule-strong) solid var(--color-ink-strong); padding-block-start: var(--space-lg); }
.review-score strong { display: block; font-family: var(--font-display); font-size: clamp(3.5rem, 8vw, 6rem); line-height: 1; color: var(--color-signal); }
.review-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-md); }
.review-card { padding: var(--space-lg); background: var(--color-paper-raised); border-top: var(--rule-strong) solid var(--color-accent); }
.review-card blockquote { color: var(--color-ink-strong); }
.review-card cite { display: block; margin-block-start: var(--space-lg); font-style: normal; font-size: var(--text-sm); color: var(--color-muted); }

.accordion { border-top: var(--rule-strong) solid var(--color-ink-strong); }
.accordion-item { border-bottom: var(--rule-hair) solid var(--color-rule); }
.accordion-button { width: 100%; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--space-lg); align-items: center; padding-block: var(--space-lg); border: 0; background: transparent; color: var(--color-ink-strong); text-align: left; font-weight: 800; cursor: pointer; }
.accordion-button span:last-child { width: 1.5rem; height: 1.5rem; display: grid; place-items: center; border: var(--rule-hair) solid var(--color-rule-strong); }
.accordion-button[aria-expanded="true"] span:last-child { color: transparent; }
.accordion-button[aria-expanded="true"] span:last-child::before { content: "−"; color: var(--color-signal); }
.accordion-button:hover { color: var(--color-signal); }
.accordion-button:focus-visible { outline: var(--rule-strong) solid var(--color-focus); outline-offset: var(--space-2xs); }
.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 { padding: 0 var(--space-xl) var(--space-lg) 0; max-width: 68ch; }
.accordion-panel ul { display: grid; gap: var(--space-xs); }
.accordion-panel li { list-style: square; margin-inline-start: var(--space-lg); }
.accordion-button[aria-expanded="true"] + .accordion-panel { grid-template-rows: 1fr; }

.page-hero { padding-block: calc(var(--nav-height) + var(--space-3xl)) var(--space-2xl); border-bottom: var(--rule-strong) solid var(--color-ink-strong); background: var(--color-paper-warm); }
.page-hero-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); gap: var(--space-3xl); align-items: end; }
.page-hero h1 { font-size: var(--text-display-s); max-width: 13ch; }
.page-hero p { max-width: 52ch; }
.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-xs); font-size: var(--text-sm); margin-block-end: var(--space-lg); }
.breadcrumbs a, .breadcrumbs span { line-height: 1; white-space: nowrap; }
.page-aside { border-inline-start: var(--rule-hair) solid var(--color-rule-strong); padding-inline-start: var(--space-xl); }

.platform-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: var(--space-xl); }
.platform { padding: var(--space-2xl); border: var(--rule-hair) solid var(--color-rule-strong); background: var(--color-paper-raised); }
.platform.is-primary { border-top: .35rem solid var(--color-signal); }
.platform h2 { font-size: var(--text-2xl); }
.platform .platform-meta { display: flex; flex-wrap: wrap; gap: var(--space-xs); margin-block: var(--space-md) var(--space-lg); }
.platform-meta span { padding: var(--space-2xs) var(--space-xs); border: var(--rule-hair) solid var(--color-rule); border-radius: var(--radius-pill); font-size: var(--text-sm); line-height: 1; white-space: nowrap; }
.status-line { display: flex; align-items: center; gap: var(--space-xs); margin-block-start: var(--space-lg); font-size: var(--text-sm); }
.status-line::before { content: ""; width: .65rem; aspect-ratio: 1; border-radius: 50%; background: var(--color-success); }
.status-line.is-muted::before { background: var(--color-disabled); }

.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-lg); counter-reset: install; }
.step { counter-increment: install; padding-block-start: var(--space-md); border-top: var(--rule-strong) solid var(--color-ink-strong); }
.step::before { content: "0" counter(install); display: block; font-family: var(--font-mono); color: var(--color-signal); margin-block-end: var(--space-md); }
.step h3 { font-size: var(--text-xl); margin-block-end: var(--space-xs); }

.specs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border: var(--rule-hair) solid var(--color-rule-strong); }
.spec-column { padding: var(--space-xl); }
.spec-column + .spec-column { border-inline-start: var(--rule-hair) solid var(--color-rule-strong); }
.spec-column h3 { font-size: var(--text-xl); padding-block-end: var(--space-md); border-bottom: var(--rule-strong) solid var(--color-ink-strong); }
.spec-column dl > div { display: grid; grid-template-columns: minmax(6rem, .4fr) minmax(0, 1fr); gap: var(--space-md); padding-block: var(--space-sm); border-bottom: var(--rule-hair) solid var(--color-rule); }
.spec-column dt { color: var(--color-muted); }
.spec-column dd { color: var(--color-ink-strong); overflow-wrap: anywhere; }

.guide-layout { display: grid; grid-template-columns: minmax(13rem, .28fr) minmax(0, .72fr); gap: var(--space-3xl); align-items: start; }
.toc { position: sticky; top: calc(var(--nav-height) + var(--space-2xl)); border-top: var(--rule-strong) solid var(--color-ink-strong); }
.toc a { display: block; padding-block: var(--space-sm); border-bottom: var(--rule-hair) solid var(--color-rule); text-decoration: none; }
.toc a:hover, .toc a:focus-visible { color: var(--color-signal); }
.guide-content { display: grid; gap: var(--space-3xl); min-width: 0; }
.guide-section { scroll-margin-top: calc(var(--nav-height) + var(--space-xl)); }
.guide-section h2 { font-size: clamp(2rem, 4vw, 3.4rem); margin-block-end: var(--space-lg); }
.guide-section h3 { font-size: var(--text-xl); margin-block: var(--space-xl) var(--space-sm); }
.guide-section p + p { margin-block-start: var(--space-md); }
.guide-section ul, .guide-section ol { display: grid; gap: var(--space-sm); margin-block: var(--space-md); padding-inline-start: var(--space-xl); }
.guide-section li { list-style: square; }
.guide-section ol li { list-style: decimal; }
.guide-table { margin-block: var(--space-lg); border-top: var(--rule-strong) solid var(--color-ink-strong); }
.guide-table th, .guide-table td { padding: var(--space-sm); border-bottom: var(--rule-hair) solid var(--color-rule); text-align: left; vertical-align: top; }
.guide-table th { color: var(--color-muted); font-weight: 700; }
.guide-callout { margin-block: var(--space-xl); padding: var(--space-lg); background: var(--color-highlight); border-top: var(--rule-strong) solid var(--color-signal); }
.guide-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-md); margin-block-end: var(--space-3xl); }
.guide-card { display: grid; gap: var(--space-sm); padding: var(--space-xl); border-top: var(--rule-strong) solid var(--color-ink-strong); background: var(--color-paper-raised); text-decoration: none; }
.guide-card:hover, .guide-card:focus-visible { border-color: var(--color-signal); color: var(--color-signal); }
.guide-card:focus-visible { outline: var(--rule-strong) solid var(--color-focus); outline-offset: var(--space-2xs); }

.article-meta { display: flex; flex-wrap: wrap; gap: var(--space-lg); margin-block-start: var(--space-xl); font-size: var(--text-sm); color: var(--color-muted); }
.article-body { width: min(100%, 68ch); margin-inline: auto; }
.article-body h2 { font-size: var(--text-2xl); margin-block: var(--space-3xl) var(--space-lg); }
.article-body h3 { font-size: var(--text-xl); margin-block: var(--space-xl) var(--space-sm); }
.article-body p + p { margin-block-start: var(--space-md); }
.article-body ul, .article-body ol { display: grid; gap: var(--space-sm); margin-block: var(--space-lg); padding-inline-start: var(--space-xl); }
.article-body li { list-style: square; }
.article-body ol li { list-style: decimal; }

.final-cta { position: relative; overflow: hidden; min-height: 32rem; display: grid; align-items: end; background: var(--color-ink-strong); color: var(--color-on-dark); }
.final-cta img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; opacity: .34; }
.final-cta::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, var(--color-ink-strong), color-mix(in oklch, var(--color-ink-strong) 15%, transparent)); }
.final-cta-content { position: relative; z-index: var(--z-raised); padding-block: var(--space-3xl); }
.final-cta h2 { color: var(--color-on-dark); font-size: clamp(2.5rem, 7vw, 5rem); max-width: 12ch; }
.final-cta p { max-width: 45ch; margin-block: var(--space-md) var(--space-xl); }

.site-footer { padding-block: var(--space-xl) calc(var(--space-3xl) + var(--space-2xl)); border-top: var(--rule-strong) solid var(--color-ink-strong); background: var(--color-paper-warm); }
.footer-line { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-sm) var(--space-lg); }
.footer-line a { line-height: 1; white-space: nowrap; }
.footer-brand { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 700; text-decoration: none; }
.footer-links { display: contents; }
.footer-sep { color: var(--color-muted); }
.footer-small { margin-block-start: var(--space-lg); max-width: 75ch; font-size: var(--text-sm); color: var(--color-muted); }

.sticky-cta { position: fixed; inset: auto 0 0; z-index: var(--z-sticky); display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--space-md); align-items: center; padding: var(--space-sm) var(--page-gutter); background: color-mix(in oklch, var(--color-paper-warm) 94%, transparent); border-top: var(--rule-hair) solid var(--color-rule-strong); box-shadow: 0 calc(var(--space-xs) * -1) var(--space-xl) var(--color-shadow-soft); }
.sticky-cta p { font-size: var(--text-sm); font-weight: 700; color: var(--color-ink-strong); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.back-top { position: fixed; inset: auto var(--space-md) 5.25rem auto; z-index: var(--z-sticky); width: 2.75rem; aspect-ratio: 1; border: var(--rule-hair) solid var(--color-rule-strong); background: var(--color-paper-warm); color: var(--color-ink-strong); opacity: 0; pointer-events: none; transform: translateY(var(--space-sm)); transition: opacity var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out); }
.back-top.is-visible { opacity: 1; pointer-events: auto; transform: none; }
.back-top:hover { border-color: var(--color-signal); color: var(--color-signal); }
.back-top:focus-visible { outline: var(--rule-strong) solid var(--color-focus); outline-offset: var(--space-2xs); }

.mobile-nav { display: none; }

.lightbox { width: min(92vw, 82rem); max-width: none; border: 0; padding: 0; background: transparent; color: var(--color-on-dark); overflow: visible; }
.lightbox::backdrop { background: var(--color-overlay); }
.lightbox-stage { display: grid; gap: var(--space-md); }
.lightbox img { width: 100%; max-height: 78vh; object-fit: contain; background: var(--color-ink-strong); }
.lightbox figcaption { text-align: center; }
.lightbox-close, .lightbox-prev, .lightbox-next { position: fixed; z-index: var(--z-modal); width: 3rem; aspect-ratio: 1; border: var(--rule-hair) solid color-mix(in oklch, var(--color-on-dark) 60%, transparent); background: var(--color-ink-strong); color: var(--color-on-dark); font-size: var(--text-xl); cursor: pointer; }
.lightbox-close { inset: var(--space-md) var(--space-md) auto auto; }
.lightbox-prev { inset: 50% auto auto var(--space-md); }
.lightbox-next { inset: 50% var(--space-md) auto auto; }
.lightbox button:hover { background: var(--color-violet); }
.lightbox button:focus-visible { outline: var(--rule-strong) solid var(--color-accent); outline-offset: var(--space-2xs); }

@media (max-width: 64rem) {
  .nav-links { display: none; }
  .nav-download { justify-self: end; }
  .menu-toggle { display: inline-flex; justify-self: end; }
  .nav-inner { grid-template-columns: auto minmax(0, 1fr) auto; }
  .nav-download { display: none; }
  .site-nav.is-floating .nav-inner { width: calc(100% - var(--space-md)); }
  .mobile-nav { position: fixed; inset: calc(var(--nav-height) + var(--space-md)) var(--space-xs) auto; z-index: var(--z-dropdown); display: grid; padding: var(--space-md); background: var(--color-paper-warm); border: var(--rule-hair) solid var(--color-rule-strong); box-shadow: 0 var(--space-sm) var(--space-xl) var(--color-shadow); transform: translateY(calc(var(--space-md) * -1)); opacity: 0; pointer-events: none; transition: transform var(--dur-short) var(--ease-out), opacity var(--dur-short) var(--ease-out); }
  .mobile-nav.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .mobile-nav a { padding: var(--space-sm); text-decoration: none; font-weight: 700; white-space: nowrap; }
  .hero { min-height: auto; }
  .hero-media { inset: 0; opacity: .65; }
  .hero-media::after { background: color-mix(in oklch, var(--color-ink-strong) 72%, transparent); }
  .hero-grid { grid-template-columns: minmax(0, 1fr); min-height: 42rem; }
  .hero-copy { align-self: end; }
  .hero-facts { grid-template-columns: repeat(3, minmax(0, 1fr)); border-inline-start: 0; border-top: var(--rule-hair) solid color-mix(in oklch, var(--color-on-dark) 42%, transparent); padding: var(--space-lg) 0 0; }
  .ledger-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .ledger-item:nth-child(3) { border-inline-end: 0; }
  .ledger-item:nth-child(-n+3) { border-bottom: var(--rule-hair) solid var(--color-rule); }
  .spread { grid-template-columns: minmax(0, 1fr); }
  .spread-visual { min-height: 28rem; }
  .feature-stack, .guide-layout { grid-template-columns: minmax(0, 1fr); }
  .feature-index, .toc { position: static; }
  .feature-links { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-links a:nth-child(odd) { border-inline-end: var(--rule-hair) solid var(--color-rule); padding-inline-end: var(--space-sm); }
  .gallery-page-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .review-summary { grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); }
  .review-cards { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 48rem) {
  .section { padding-block: var(--space-2xl); }
  .section-head, .page-hero-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-lg); }
  .section-head p { justify-self: start; }
  .vertical-note { writing-mode: horizontal-tb; }
  .hero { padding-block-start: calc(var(--nav-height) + var(--space-xl)); }
  .hero h1 { font-size: clamp(2.75rem, 15vw, 4.5rem); }
  .hero-grid { min-height: 39rem; }
  .hero-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-facts .hero-fact:last-child { grid-column: 1 / -1; }
  .hero-fact dd { font-size: var(--text-lg); }
  .ledger-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ledger-item, .ledger-item:nth-child(3) { border-inline-end: var(--rule-hair) solid var(--color-rule); border-bottom: var(--rule-hair) solid var(--color-rule); }
  .ledger-item:nth-child(even) { border-inline-end: 0; }
  .ledger-item:nth-last-child(-n+2) { border-bottom: 0; }
  .spread-copy { padding: var(--space-2xl) var(--page-gutter); }
  .spread-visual { min-height: 22rem; }
  .feature-links { grid-template-columns: minmax(0, 1fr); }
  .feature-links a:nth-child(odd) { border-inline-end: 0; }
  .feature-panel, .feature-panel:nth-child(even) { grid-template-columns: minmax(0, 1fr); }
  .feature-panel:nth-child(even) .feature-panel-copy { order: 0; }
  .gallery-ribbon { grid-template-columns: minmax(0, 1fr); }
  .gallery-card, .gallery-card:first-child, .gallery-card:nth-child(2), .gallery-card:nth-child(3) { grid-column: auto; grid-row: auto; }
  .gallery-page-grid { grid-template-columns: minmax(0, 1fr); }
  .download-band { grid-template-columns: minmax(0, 1fr); padding: var(--space-xl); }
  .timeline article { grid-template-columns: minmax(0, 1fr); gap: var(--space-sm); }
  .platform-grid, .specs, .steps { grid-template-columns: minmax(0, 1fr); }
  .spec-column + .spec-column { border-inline-start: 0; border-top: var(--rule-hair) solid var(--color-rule-strong); }
  .guide-cards { grid-template-columns: minmax(0, 1fr); }
  .guide-table { display: block; overflow-x: auto; }
  .sticky-cta p { display: none; }
  .sticky-cta { grid-template-columns: minmax(0, 1fr); padding-inline: var(--space-md); }
  .sticky-cta .button { width: 100%; }
  .site-footer { padding-block-end: calc(var(--space-4xl) + var(--space-xl)); }
  .lightbox-prev { inset-inline-start: var(--space-xs); }
  .lightbox-next { inset-inline-end: var(--space-xs); }
}

@media (max-width: 25.875rem) {
  .brand-name { font-size: var(--text-base); }
  .hero-facts { grid-template-columns: minmax(0, 1fr); }
  .hero-facts .hero-fact:last-child { grid-column: auto; }
  .ledger-item { padding: var(--space-md); }
  .cta-row .button { width: 100%; }
  .footer-line { align-items: flex-start; flex-direction: column; }
  .footer-sep { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .petal { display: none; }
  .button::after { display: none; }
  button:active { transform: none; }
}