/* The photographic entrance and the headset archive share a restrained recording frame. */
:root {
  --ground: #0c0e0e;
  --ground-deep: #070909;
  --ink: #e9e5dc;
  --ink-muted: #a6aaa3;
  --line: rgb(211 224 211 / 17%);
  --line-strong: rgb(211 224 211 / 34%);
  --signal: #bbc8b5;
  --accent: #b53d3f;
  --section-space: clamp(3rem, 5vw, 5rem);
}
[hidden] { display: none !important; }
body { min-width: 0; }
section[id] { scroll-margin-top: 1rem; }
button, summary { font: inherit; }
.site-header {
  position: absolute;
  inset: 0 0 auto;
  background: transparent;
  border-color: rgb(233 229 220 / 20%);
  min-height: 5rem;
}
.site-mark { font-size: 1.3rem; }
.site-nav a { color: var(--ink); }
.hero {
  position: relative;
  width: min(100%, 112.5rem);
  margin: 5rem auto 0;
  overflow: clip;
  background: var(--ground);
}
.hero-picture { position: relative; display: block; }
.hero-picture img { width: 100%; height: auto; }
.hero-picture::before { display: none; }
.hero-picture::after {
  inset: auto 0 0;
  height: 4rem;
  background: linear-gradient(0deg, var(--ground), transparent);
}
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.5rem;
  min-height: 48px;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  padding: .65rem 0;
  color: var(--ink);
  background: transparent;
  font-size: .85rem;
  text-decoration: none;
  cursor: pointer;
}
.text-link span { transition: transform .25s ease; }
.text-link:hover span { transform: translate(3px, 3px); }
.text-link:hover { border-color: var(--signal); }
.hero-bottom {
  position: relative;
  margin-inline: var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  border-top: 1px solid var(--line);
  padding-block: 1rem;
}
.hero-bottom p { font-size: .8rem; line-height: 1.9; margin: 0; color: var(--ink-muted); }
.hero-bottom > span, .camera-topline, .viewer-topline, .section-number {
  font: .65rem/1.6 "IBM Plex Mono", "Yu Gothic", sans-serif;
  letter-spacing: .12em;
  color: var(--ink-muted);
}
.fixed-view {
  max-width: 92rem;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  padding-block: var(--section-space);
  gap: clamp(2rem, 4vw, 4rem);
}
.section-number { margin-bottom: .75rem; }
.fixed-view h2 { font-size: clamp(3.5rem, 5.6vw, 6rem); }
.fixed-view-lead { color: var(--ink); margin-top: 1.5rem; line-height: 2; }
.section-description { color: var(--ink-muted); font-size: .9rem; line-height: 2.15; max-width: 32em; }
.fixed-view-copy .text-link { margin-top: 1rem; }
.camera-topline, .viewer-topline { display: flex; justify-content: space-between; gap: 1rem; padding: .85rem 0; }
.crt {
  width: 100%;
  aspect-ratio: 4/3;
  background: transparent;
}
.crt-screen {
  top: 13%;
  left: 18.8%;
  width: 63.8%;
  height: 58%;
  border-radius: 8% / 6%;
}
.camera-feed { object-fit: cover; filter: none; }
.screen-noise {
  background-image:
    repeating-linear-gradient(to bottom, rgb(235 225 210 / 14%) 0 1px, transparent 1px 4px),
    repeating-linear-gradient(97deg, transparent 0 2px, rgb(235 225 210 / 8%) 2px 3px);
  background-size: auto, 6px 5px;
  mix-blend-mode: screen;
  opacity: .12;
}
.camera-indicator { font: .7rem "IBM Plex Mono", monospace; top: 5%; right: 5%; }
.camera-console { width: 82%; margin: -3% auto 0; position: relative; padding-top: 0; border-top: 0; gap: 0; }
.camera-button {
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  min-height: 52px;
}
.camera-button + .camera-button { border-left: 0; }
.camera-button.is-active { transform: none; border-color: var(--line-strong); background: #242a25; box-shadow: inset 0 -2px var(--signal); }
.camera-button:hover, .camera-button:focus-visible { background: #1d2420; }
.button-led { background: transparent; border-color: var(--ink-muted); border-radius: 0; }
.camera-button.is-active .button-led { background: var(--signal); border-color: var(--signal); box-shadow: none; }
.camera-caption { font-size: .72rem; color: var(--ink-muted); margin: .75rem 0 0; text-align: center; }
.perspective-lab {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  width: min(100%, 92rem);
  padding: var(--section-space) var(--gutter);
  max-width: 92rem;
  margin: 0 auto;
  border-bottom: 1px solid var(--line);
}
.lab-heading h2 { font-family: "Yuji Boku", serif; font-size: clamp(3.5rem, 5.6vw, 6rem); line-height: 1.2; font-weight: 400; margin: 0; }
.lab-heading .section-description { margin: 1rem 0 0; }
@media (min-width: 901px) {
  .lab-heading { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 2rem; align-items: center; }
  .lab-heading .section-number { grid-column: 1; }
  .lab-heading h2 { grid-column: 1; }
  .lab-heading .section-description { grid-column: 2; grid-row: 1 / 3; margin: 0; }
}
.game-actions { display: flex; flex-wrap: wrap; gap: .7rem 2rem; margin-top: 1.75rem; align-items: center; }
#game-unavailable { font-size: .8rem; color: var(--ink-muted); padding-left: 1.2rem; border-left: 2px solid var(--accent); }
.game-state { font: .8rem/1.8 "Yu Gothic", sans-serif; color: var(--ink-muted); }
.game-state:empty, .game-stage:empty { display: none; }
.game-stage { margin-top: 1.5rem; }
.game-stage iframe { display: block; width: 100%; height: 36rem; min-height: 420px; border: 1px solid var(--line-strong); background: #050707; }
.scenario {
  max-width: 92rem;
  margin: 0 auto;
  grid-template-columns: .8fr 1.2fr;
  padding: 0 var(--gutter) var(--section-space);
  border: 0;
  background: var(--ground);
  gap: 5vw;
}
.scenario::before { display: none; }
.scenario h2 { font-size: clamp(3.4rem, 5vw, 5.6rem); }
.scenario-copy > p:last-child { color: var(--ink); }
.scenario-collage { aspect-ratio: 1.12; }
.wall-photo { position: absolute; width: 72%; left: 0; top: 3%; margin: 0; }
.wall-evidence {
  position: static;
  width: 100%;
  height: auto;
  transform: none;
  border: 1px solid var(--line-strong);
  box-shadow: none;
  filter: none;
}
.wall-photo figcaption { font-size: .65rem; letter-spacing: .08em; color: var(--ink-muted); padding-top: .5rem; }
.investigation-request { top: 20%; left: 45%; width: 50%; transform: rotate(5deg); }
.investigation-request:hover, .investigation-request:focus-visible { transform: translateY(-.4rem) rotate(2deg); }
.investigation-request img { box-shadow: 0 1rem 4rem #0009; }
.archive { border-top: 1px solid var(--line); padding-block: var(--section-space); }
.footage { padding: var(--section-space) var(--gutter); border-block: 1px solid var(--line); background: var(--ground-deep); }
.footage .plate-heading { border-bottom: 0; margin-bottom: 1rem; }
.footage .plate-heading h2 { font-size: clamp(2.5rem, 4vw, 4rem); }
.footage-intro { display: flex; justify-content: space-between; gap: 2rem; margin-bottom: 1.5rem; }
.footage-intro > p { font-size: .95rem; line-height: 2; }
.footage-intro .section-description { font-size: .8rem; }
.footage-gate { border: 1px solid var(--line-strong); }
.footage-gate > summary { cursor: pointer; list-style: none; display: flex; align-items: center; gap: 1rem; padding: 1rem 1.25rem; min-height: 80px; background: rgb(211 224 211 / 3%); }
.footage-gate > summary::-webkit-details-marker { display: none; }
.footage-gate > summary:hover { background: rgb(211 224 211 / 7%); }
.gate-index { font: 1.2rem "IBM Plex Mono", monospace; padding: .5rem .7rem; border: 1px solid var(--line-strong); color: var(--signal); }
.footage-gate small { display: block; font-size: .7rem; color: var(--ink-muted); margin-top: .35rem; }
.gate-symbol { font-size: 1.5rem; margin-left: auto; transition: transform .25s ease; }
.footage-gate[open] .gate-symbol { transform: rotate(45deg); }
.footage-room { padding: 0 2rem 1.5rem; border-top: 1px solid var(--line); }
.footage-controls { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-bottom: 1px solid var(--line); margin-bottom: 1rem; }
.footage-controls button { padding: 1.2rem .75rem; min-height: 68px; border: 0; background: transparent; color: var(--ink-muted); font-size: .8rem; cursor: pointer; }
.footage-controls button span { display: block; font: .65rem "IBM Plex Mono", monospace; margin-bottom: .5rem; }
.footage-controls button[aria-pressed="true"] { color: var(--ink); box-shadow: inset 0 -2px var(--signal); }
.footage-controls button:hover { color: var(--ink); background: rgb(211 224 211 / 5%); }
.footage-viewer { width: min(100%, 46rem); margin: 0 auto; }
.viewer-topline { padding-inline: .25rem; }
#footage-player { display: block; width: 100%; height: auto; max-height: 76svh; aspect-ratio: 1/1; object-fit: contain; background: #000; border: 1px solid var(--line); }
.footage-caption { max-width: 46rem; margin: 1.5rem auto 0; }
.footage-caption h3 { font-size: 1.2rem; font-weight: 400; margin: 0; }
.footage-caption p { font-size: .85rem; color: var(--ink-muted); margin: .6rem 0; }
.footage-caption, .game-state { font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif; }
#footage-meta, .footage-note { font-size: .7rem; color: var(--ink-muted); }
.footage-note { margin: 1.5rem 0 0; }
#footage-error:empty { display: none; }
.credits { padding-block: var(--section-space); }
.plate-email {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin-top: .35rem;
  color: var(--ink);
  font: .68rem/1.5 "IBM Plex Mono", monospace;
  letter-spacing: .01em;
  overflow-wrap: anywhere;
  text-underline-offset: .2em;
}
.plate-email:hover, .plate-email:focus-visible { color: var(--signal); }
.site-footer { background: var(--ground-deep); }
.site-footer .text-link { font-size: .75rem; color: var(--ink-muted); border: 0; }
@media (max-width: 900px) {
  .fixed-view { grid-template-columns: 1fr; gap: 1.5rem; }
  .fixed-view-copy { display: block; max-width: none; }
  .fixed-view-lead { margin-top: 1.75rem; }
  .camera-exhibit { max-width: 44rem; width: 100%; margin: auto; }
  .perspective-lab, .scenario { grid-template-columns: 1fr; }
  .scenario { gap: 1.5rem; }
  .scenario-collage { width: min(100%, 42rem); }
}
@media (max-width: 600px) {
  .site-header { min-height: 6.5rem; flex-wrap: wrap; align-content: center; gap: 0; padding-block: .4rem; }
  .site-mark { font-size: 1.1rem; letter-spacing: .08em; }
  .site-nav { width: 100%; justify-content: space-between; gap: .5rem; }
  .site-nav a { font-size: .72rem; letter-spacing: .01em; }
  .site-nav a[href="#scenario"] { display: none; }
  .hero { margin-top: 6.5rem; }
  .hero-bottom { gap: .75rem; align-items: center; padding-block: .75rem; }
  .hero-bottom p { font-size: .7rem; }
  .hero-enter { gap: .7rem; font-size: .73rem; flex-shrink: 0; }
  .fixed-view { padding-block: var(--section-space); }
  .fixed-view-copy { display: block; }
  .fixed-view h2 { font-size: 3.7rem; }
  .fixed-view-lead { margin-top: 1.75rem; }
  .section-description { font-size: .84rem; }
  .crt { width: 100%; margin-left: 0; }
  .camera-button { font-size: .72rem; }
  .credit-list > div { grid-template-columns: minmax(0, 1fr); gap: .4rem; }
  .credit-list > div::before, .credit-list dt::after { display: none; }
  .credit-list dt { display: block; font-size: clamp(.72rem, 3.4vw, .88rem); line-height: 1.6; }
  .credit-list dd { text-align: left; }
  .lab-heading h2 { font-size: 3.1rem; }
  .scenario { padding-top: 0; padding-bottom: var(--section-space); }
  .scenario h2 { font-size: 3.3rem; }
  .scenario-collage { aspect-ratio: .95; }
  .investigation-request { top: 28%; left: 42%; width: 55%; }
  .footage .plate-heading h2 { font-size: 2rem; letter-spacing: .08em; text-wrap: balance; }
  .footage-intro { display: block; }
  .footage-gate > summary { padding: 1.25rem .85rem; gap: .7rem; font-size: .86rem; }
  .gate-index { font-size: .75rem; padding: .4rem; }
  .footage-gate small { font-size: .62rem; }
  .gate-symbol { font-size: 1.2rem; }
  .footage-room { padding: 0 .75rem 1rem; }
  .footage-controls button { font-size: .7rem; padding-inline: .4rem; }
  .viewer-topline { font-size: .58rem; }
  .site-footer { flex-wrap: wrap; gap: .5rem 1rem; }
  .site-footer > span { width: 100%; }
  .site-footer .text-link { font-size: .7rem; }
}
@media (max-width: 360px) {
  .credits .plate-heading h2 { font-size: 1.65rem; letter-spacing: .06em; white-space: nowrap; }
}
@media (prefers-reduced-motion: reduce) {
  .js-reveal [data-reveal] { opacity: 1; transform: none; }
}

/* 見出しは章ごとに揃え、狭い列だけ縮める。 */
.lab-heading,
.fixed-view-copy,
.scenario-copy,
.plate-heading {
  container-type: inline-size;
  min-width: 0;
}
.perspective-lab .lab-heading h2,
.fixed-view .fixed-view-copy h2,
.scenario .scenario-copy h2,
.archive .plate-heading h2,
.footage .plate-heading h2,
.credits .plate-heading h2 {
  max-width: 100%;
  font-size: clamp(1.4rem, 3.5vw, 2.2rem);
  line-height: 1.2;
  white-space: nowrap;
}
@supports (font-size: 1cqi) {
  .perspective-lab .lab-heading h2,
  .fixed-view .fixed-view-copy h2,
  .scenario .scenario-copy h2,
  .archive .plate-heading h2,
  .footage .plate-heading h2,
  .credits .plate-heading h2 {
    font-size: clamp(1.4rem, min(9cqi, 4vw), 3rem);
  }
}
@media (max-width: 600px) {
  .perspective-lab .lab-heading h2,
  .fixed-view .fixed-view-copy h2,
  .scenario .scenario-copy h2,
  .archive .plate-heading h2,
  .footage .plate-heading h2,
  .credits .plate-heading h2 { font-size: clamp(1.4rem, 8.8cqi, 2rem); }
}