/* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V5
 * macrostructure: Archive Index · nav: N5 Floating pill · footer: Ft5 Statement · theme: Midnight
 * audience: adult visual-novel players · use: discovery, safe download, route planning · tone: nocturnal dossier
 */
:root {
  --color-paper: oklch(14% 0.014 274);
  --color-paper-2: oklch(18% 0.018 274);
  --color-paper-3: oklch(22% 0.022 274);
  --color-ink: oklch(95% 0.008 90);
  --color-ink-soft: oklch(82% 0.012 274);
  --color-muted: oklch(64% 0.014 274);
  --color-rule: oklch(34% 0.020 274);
  --color-accent: oklch(74% 0.17 48);
  --color-accent-soft: oklch(82% 0.10 48);
  --color-focus: oklch(82% 0.14 48);
  --color-night: oklch(11% 0.012 274);
  --font-display: "Noto Sans SC", system-ui, sans-serif;
  --font-body: "Noto Sans SC", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --space-1: .35rem;
  --space-2: .7rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.25rem;
  --space-6: 3.5rem;
  --space-7: 5.5rem;
  --space-8: 8rem;
  --content: 78rem;
  --narrow: 46rem;
  --shadow: 0 1rem 3rem oklch(5% .015 274 / .36);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; }
body { margin: 0; overflow-x: clip; background: var(--color-paper); color: var(--color-ink); font-family: var(--font-body); font-weight: 400; line-height: 1.75; }
body, button, a { -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 4px; }
button, a { touch-action: manipulation; }
button { font: inherit; }
h1, h2, h3, p { margin-block: 0; }
h1, h2, h3 { font-family: var(--font-display); font-style: normal; overflow-wrap: anywhere; min-width: 0; line-height: 1.15; }
h1 { letter-spacing: -.04em; }
h2 { letter-spacing: -.025em; }
p { color: var(--color-ink-soft); }
small { color: var(--color-muted); }

.page-wrap { min-height: 100vh; }
.container { width: min(var(--content), calc(100% - 2rem)); margin-inline: auto; }
.narrow { max-width: var(--narrow); }
.eyebrow, .record-label, .micro-label { color: var(--color-accent-soft); font-family: var(--font-mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; }
.eyebrow::before { content: ""; display: inline-block; width: .55rem; height: .55rem; margin-inline-end: .6rem; background: var(--color-accent); }

/* N5 Floating pill: compact, keyboard-friendly, and collapsed into a sheet on mobile. */
.site-nav { position: fixed; z-index: 20; top: .8rem; inset-inline: 0; pointer-events: none; }
.nav-inner { display: flex; align-items: center; gap: .65rem; width: min(var(--content), calc(100% - 1rem)); min-height: 3.4rem; margin-inline: auto; padding: .45rem .5rem .45rem .7rem; border: 1px solid oklch(70% .02 274 / .18); border-radius: 2rem; background: oklch(14% .014 274 / .92); box-shadow: 0 .65rem 2rem oklch(6% .015 274 / .38); backdrop-filter: blur(16px); pointer-events: auto; }
.brand { display: inline-flex; align-items: center; min-width: 0; text-decoration: none; }
.brand img { width: clamp(7.5rem, 20vw, 11.5rem); height: auto; aspect-ratio: 5 / 1; object-fit: contain; object-position: left center; }
.nav-links { display: flex; align-items: center; gap: .2rem; margin-inline: auto; }
.nav-links a, .nav-download, .menu-toggle { white-space: nowrap; text-decoration: none; font-size: .78rem; color: var(--color-ink-soft); }
.nav-links a { padding: .45rem .65rem; border-radius: 1.5rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--color-ink); background: var(--color-paper-3); }
.nav-download, .menu-toggle { border: 1px solid oklch(82% .10 48 / .45); border-radius: 1.5rem; padding: .55rem .85rem; color: var(--color-ink); background: var(--color-accent); }
.menu-toggle { display: none; color: var(--color-night); cursor: pointer; }

.hero { position: relative; min-height: min(60rem, 100svh); display: grid; align-items: end; isolation: isolate; overflow: clip; padding-block: 8rem 3rem; }
.hero::after { content: ""; position: absolute; z-index: -1; inset: 0; background: linear-gradient(90deg, oklch(11% .014 274 / .97) 0%, oklch(11% .014 274 / .72) 40%, oklch(11% .014 274 / .2) 72%, oklch(11% .014 274 / .7) 100%), linear-gradient(0deg, oklch(11% .014 274 / .96) 0%, oklch(11% .014 274 / .06) 68%); }
.hero-art { position: absolute; z-index: -2; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; filter: saturate(.88) contrast(1.08); }
.hero-grid { display: grid; gap: var(--space-6); align-items: end; }
.hero-copy { max-width: 46rem; }
.hero h1 { max-width: 10ch; margin-block: 1rem 1.2rem; font-size: clamp(2.6rem, 8vw, 6.8rem); }
.hero-subtitle { max-width: 39rem; font-size: clamp(1rem, 1.5vw, 1.25rem); }
.hero-data { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem 1.5rem; max-width: 34rem; margin-block: 2rem; padding-block: 1rem; border-block: 1px solid oklch(80% .02 274 / .22); }
.data-item span, .ledger-item span { display: block; color: var(--color-muted); font-family: var(--font-mono); font-size: .66rem; letter-spacing: .08em; text-transform: uppercase; }
.data-item strong, .ledger-item strong { display: block; color: var(--color-ink); font-size: .9rem; font-weight: 700; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.button { position: relative; display: inline-flex; align-items: center; justify-content: center; min-height: 3rem; padding: .75rem 1.2rem; border: 1px solid transparent; border-radius: .3rem; white-space: nowrap; text-decoration: none; font-weight: 700; cursor: pointer; transition: transform .22s ease, background-color .22s ease, border-color .22s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { overflow: hidden; color: var(--color-night); background: var(--color-accent); box-shadow: 0 .6rem 1.8rem oklch(40% .10 48 / .28); }
.button-primary::after { content: ""; position: absolute; inset-block: 0; width: 24%; transform: translateX(-160%) skewX(-20deg); background: oklch(98% .01 90 / .62); animation: sheen 3.3s ease-in-out infinite; }
.button-secondary { border-color: oklch(80% .02 274 / .32); color: var(--color-ink); background: oklch(13% .015 274 / .36); }
.button-secondary:hover { border-color: var(--color-accent); background: var(--color-paper-3); }
@keyframes sheen { 0%, 38% { transform: translateX(-160%) skewX(-20deg); } 66%, 100% { transform: translateX(460%) skewX(-20deg); } }

.ledger { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-block: 1px solid var(--color-rule); background: var(--color-paper-2); }
.ledger-item { min-height: 6.5rem; display: flex; flex-direction: column; justify-content: center; gap: .35rem; padding: 1.2rem 1rem; border-inline-end: 1px solid var(--color-rule); border-block-end: 1px solid var(--color-rule); }

.section { padding-block: var(--space-8); }
.section-dark { background: var(--color-night); }
.section-head { display: grid; gap: 1rem; margin-block-end: 2.2rem; }
.section-head h2 { max-width: 14ch; font-size: clamp(2rem, 5vw, 4.1rem); }
.section-head p { max-width: 36rem; }
.record { display: grid; gap: 1.5rem; padding-block: .35rem; border-top: 1px solid var(--color-rule); }
.record-label { padding-top: .35rem; }
.story-grid { display: grid; gap: 2rem; }
.story-grid h2 { font-size: clamp(1.9rem, 4vw, 3.5rem); }
.prose { max-width: 42rem; }
.prose p + p { margin-top: 1.2rem; }
.text-link { display: inline-block; margin-top: 1.4rem; color: var(--color-accent-soft); text-decoration: none; border-bottom: 1px solid var(--color-accent); }
.text-link:hover { color: var(--color-ink); }

.spec-grid { display: grid; grid-template-columns: repeat(1, minmax(0, 1fr)); border-top: 1px solid var(--color-rule); }
.spec-card { min-height: 12rem; padding: 1.4rem; border-inline-end: 1px solid var(--color-rule); border-bottom: 1px solid var(--color-rule); transition: transform .22s ease, background-color .22s ease, box-shadow .22s ease; }
.spec-card:hover { transform: translateY(-3px); background: var(--color-paper-2); box-shadow: var(--shadow); }
.spec-card .card-index { color: var(--color-accent-soft); font-family: var(--font-mono); font-size: .7rem; }
.spec-card h3 { margin-block: 1.5rem .65rem; font-size: 1.15rem; }

.image-index { display: grid; grid-template-columns: repeat(1, minmax(0, 1fr)); gap: .8rem; }
.image-index figure { position: relative; margin: 0; overflow: clip; border: 1px solid var(--color-rule); background: var(--color-paper-2); cursor: pointer; }
.image-index figure:first-child { grid-row: span 2; }
.image-index img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; transition: transform .35s ease, filter .35s ease; }
.image-index figure:first-child img { aspect-ratio: 4 / 5; }
.image-index figure:hover img { transform: scale(1.04); filter: brightness(1.12); }
.image-index figcaption { padding: .65rem .8rem .8rem; color: var(--color-muted); font-size: .76rem; }

.download-band { padding-block: 3rem; border-block: 1px solid oklch(82% .10 48 / .34); background: var(--color-accent); color: var(--color-night); }
.download-band p, .download-band small { color: oklch(24% .018 48); }
.download-band h2 { max-width: 18ch; font-size: clamp(2rem, 5vw, 4rem); }
.download-band .button-primary { border-color: var(--color-night); color: var(--color-accent); background: var(--color-night); }

.timeline { display: grid; gap: 0; border-top: 1px solid var(--color-rule); }
.timeline-item { display: grid; grid-template-columns: 7rem 1fr; gap: 1rem; padding-block: 1.3rem; border-bottom: 1px solid var(--color-rule); }
.timeline-item time { color: var(--color-accent-soft); font-family: var(--font-mono); font-size: .72rem; letter-spacing: .08em; }
.timeline-item h3 { margin-bottom: .35rem; font-size: 1.1rem; }

.fit-grid { display: grid; grid-template-columns: repeat(1, minmax(0, 1fr)); gap: .8rem; }
.fit-card { padding: 1.4rem; border: 1px solid var(--color-rule); background: var(--color-paper-2); }
.fit-card p { color: var(--color-ink); font-size: 1.1rem; }
.fit-card span { display: block; margin-top: 1.2rem; color: var(--color-accent-soft); font-family: var(--font-mono); font-size: .7rem; }

.faq-list { border-top: 1px solid var(--color-rule); }
.faq-list details { border-bottom: 1px solid var(--color-rule); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 0; color: var(--color-ink); cursor: pointer; list-style: none; font-weight: 700; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { flex: 0 0 auto; color: var(--color-accent-soft); font-family: var(--font-mono); font-size: 1.1rem; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details p { max-width: 44rem; padding: 0 2rem 1.2rem 0; }

.article-index { display: grid; grid-template-columns: repeat(1, minmax(0, 1fr)); gap: .65rem; }
.article-index a { display: flex; justify-content: space-between; gap: 1rem; padding: .9rem 1rem; border-bottom: 1px solid var(--color-rule); color: var(--color-ink-soft); text-decoration: none; }
.article-index a:hover { color: var(--color-accent-soft); background: var(--color-paper-2); }
.article-index span { color: var(--color-muted); font-family: var(--font-mono); font-size: .68rem; }

.final-cta { padding-block: var(--space-8); text-align: center; background: var(--color-paper-2); }
.final-cta h2 { max-width: 18ch; margin: .8rem auto; font-size: clamp(2.5rem, 7vw, 6rem); }
.final-cta p { max-width: 34rem; margin-inline: auto; }
.final-cta .hero-actions { justify-content: center; margin-top: 1.7rem; }
.final-cta small { display: block; margin-top: 1.5rem; }

.site-footer { padding-block: 5rem 2rem; background: var(--color-night); }
.footer-statement { max-width: 14ch; font-size: clamp(2rem, 5vw, 4.5rem); letter-spacing: -.04em; }
.footer-grid { display: grid; gap: 2.5rem; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--color-rule); }
.footer-grid h3 { margin-bottom: .65rem; font-size: .78rem; color: var(--color-accent-soft); font-family: var(--font-mono); letter-spacing: .08em; text-transform: uppercase; }
.footer-grid p { max-width: 31rem; font-size: .85rem; }
.footer-links { display: grid; gap: .25rem; }
.footer-links a { color: var(--color-muted); font-size: .84rem; text-decoration: none; }
.footer-links a:hover { color: var(--color-ink); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .7rem; margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--color-rule); color: var(--color-muted); font-family: var(--font-mono); font-size: .65rem; }

/* Gallery / download / guide / article surfaces */
.subpage-hero { padding-block: 10rem 4rem; border-bottom: 1px solid var(--color-rule); background: radial-gradient(circle at 80% 20%, oklch(28% .05 274 / .8), transparent 42%), var(--color-paper); }
.subpage-hero h1 { max-width: 15ch; margin-block: .7rem 1rem; font-size: clamp(2.6rem, 7vw, 6rem); }
.subpage-hero p { max-width: 42rem; }
.page-layout { display: grid; gap: 2.5rem; padding-block: 4rem 7rem; }
.side-index { align-self: start; padding: 1rem; border: 1px solid var(--color-rule); background: var(--color-paper-2); }
.side-index strong { display: block; margin-bottom: .6rem; color: var(--color-accent-soft); font-family: var(--font-mono); font-size: .7rem; }
.side-index a { display: block; padding: .35rem 0; color: var(--color-muted); font-size: .85rem; text-decoration: none; }
.side-index a:hover { color: var(--color-ink); }
.gallery-tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.5rem; }
.tab { border: 1px solid var(--color-rule); padding: .5rem .8rem; color: var(--color-muted); background: transparent; cursor: pointer; white-space: nowrap; }
.tab[aria-selected="true"], .tab:hover { border-color: var(--color-accent); color: var(--color-ink); }
.gallery-grid { display: grid; grid-template-columns: repeat(1, minmax(0, 1fr)); gap: .75rem; }
.gallery-card { border: 1px solid var(--color-rule); background: var(--color-paper-2); text-align: start; cursor: pointer; }
.gallery-card[hidden] { display: none; }
.gallery-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.gallery-card figcaption { padding: .7rem .8rem .8rem; color: var(--color-muted); font-size: .75rem; }
.lightbox { width: min(94vw, 72rem); max-width: none; padding: 0; border: 1px solid var(--color-rule); background: var(--color-night); color: var(--color-ink); }
.lightbox::backdrop { background: oklch(6% .01 274 / .88); }
.lightbox img { width: 100%; max-height: 78svh; object-fit: contain; }
.lightbox button { position: absolute; z-index: 2; min-width: 2.8rem; min-height: 2.8rem; border: 1px solid oklch(80% .02 274 / .35); color: var(--color-ink); background: oklch(12% .014 274 / .82); cursor: pointer; }
.lightbox-close { top: .75rem; right: .75rem; }
.lightbox-prev { top: 50%; left: .75rem; transform: translateY(-50%); }
.lightbox-next { top: 50%; right: .75rem; transform: translateY(-50%); }

.download-grid, .guide-grid, .requirements { display: grid; grid-template-columns: repeat(1, minmax(0, 1fr)); gap: 1rem; }
.platform-card, .guide-card, .requirement-card { padding: 1.5rem; border: 1px solid var(--color-rule); background: var(--color-paper-2); }
.platform-card h2, .guide-card h2, .requirement-card h2 { margin-bottom: .5rem; font-size: 1.5rem; }
.platform-card .button { margin-top: 1.25rem; }
.recommended { display: inline-block; margin-bottom: .8rem; padding: .2rem .45rem; color: var(--color-accent-soft); border: 1px solid oklch(82% .10 48 / .45); font-family: var(--font-mono); font-size: .65rem; letter-spacing: .08em; }
.steps { display: grid; gap: 0; counter-reset: steps; }
.step { position: relative; padding: 1.3rem 0 1.3rem 3.2rem; border-bottom: 1px solid var(--color-rule); }
.step::before { counter-increment: steps; content: counter(steps, decimal-leading-zero); position: absolute; left: 0; top: 1.35rem; color: var(--color-accent-soft); font-family: var(--font-mono); font-size: .75rem; }
.step h3 { margin-bottom: .3rem; font-size: 1.1rem; }
.guide-card .button { margin-top: 1rem; }
.article-body { max-width: 48rem; }
.article-body h2 { margin-top: 2.8rem; margin-bottom: .8rem; font-size: clamp(1.6rem, 3vw, 2.4rem); }
.article-body h3 { margin-top: 1.8rem; margin-bottom: .5rem; font-size: 1.15rem; }
.article-body ul, .article-body ol { padding-inline-start: 1.35rem; color: var(--color-ink-soft); }
.article-body li + li { margin-top: .4rem; }
.article-body table { width: 100%; border-collapse: collapse; margin-block: 1.4rem; font-size: .9rem; }
.article-body th, .article-body td { padding: .7rem; border: 1px solid var(--color-rule); text-align: left; vertical-align: top; }
.article-body th { color: var(--color-accent-soft); background: var(--color-paper-2); }
.article-body a { color: var(--color-accent-soft); }
.answer-first { margin-block: 1.5rem; padding: 1rem 1.2rem; border-inline-start: 3px solid var(--color-accent); color: var(--color-ink); background: var(--color-paper-2); }
.source-note { color: var(--color-muted); font-size: .78rem; }

@media (min-width: 40rem) {
  .container { width: min(var(--content), calc(100% - 4rem)); }
  .hero { min-height: min(56rem, 100svh); }
  .hero-data { grid-template-columns: repeat(4, minmax(0, 1fr)); max-width: 46rem; }
  .ledger { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .ledger-item { border-block-end: 0; }
  .spec-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .image-index { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .image-index figure:first-child { grid-row: span 2; grid-column: span 1; }
  .fit-grid, .download-grid, .guide-grid, .requirements { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gallery-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1.4fr .7fr 1fr; }
}

@media (min-width: 60rem) {
  .hero { padding-block: 9rem 5rem; }
  .hero-grid { grid-template-columns: minmax(0, 1.1fr) minmax(18rem, .9fr); }
  .hero-art { object-position: 58% center; }
  .record { grid-template-columns: 10rem minmax(0, 1fr); gap: 2rem; }
  .story-grid { grid-template-columns: .8fr 1.2fr; gap: 5rem; }
  .spec-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .section-head { grid-template-columns: .8fr 1.2fr; align-items: end; }
  .section-head p { justify-self: end; }
  .image-index { grid-template-columns: 1.15fr .85fr .85fr; }
  .image-index figure:first-child { grid-row: span 2; }
  .fit-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-layout { grid-template-columns: 13rem minmax(0, 1fr); align-items: start; }
  .side-index { position: sticky; top: 5.5rem; }
  .gallery-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 48rem) {
  .nav-links { display: none; position: absolute; top: 4.2rem; inset-inline: .5rem; flex-direction: column; align-items: stretch; padding: .5rem; border: 1px solid var(--color-rule); border-radius: 1rem; background: var(--color-paper-2); box-shadow: var(--shadow); }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: .8rem 1rem; }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav-download { margin-inline-start: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}