:root {
  --black: #050505;
  --black-soft: #080808;
  --panel: #0b0b0b;
  --ivory: #e8e2d8;
  --muted: #9a9188;
  --red: #7d1f1f;
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(232, 226, 216, 0.32);
  --side: clamp(20px, 5vw, 72px);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--black);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background:
    linear-gradient(90deg, transparent calc(var(--side) - 1px), var(--line) var(--side), transparent calc(var(--side) + 1px)),
    linear-gradient(270deg, transparent calc(var(--side) - 1px), var(--line) var(--side), transparent calc(var(--side) + 1px)),
    var(--black);
  color: var(--ivory);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", "Times New Roman", serif;
}

button,
a {
  color: inherit;
  font: inherit;
}

button {
  border: 0;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 0 var(--side);
  background: linear-gradient(180deg, rgba(5, 5, 5, 0.9), rgba(5, 5, 5, 0));
  pointer-events: none;
}

.site-mark,
.chamber-nav {
  pointer-events: auto;
}

.site-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-mark span:first-child {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line);
  color: var(--ivory);
  font-size: 0.9rem;
}

.chamber-nav {
  display: flex;
  gap: clamp(14px, 2vw, 28px);
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.chamber-nav a {
  text-decoration: none;
  transition: color 180ms ease;
}

.chamber-nav a:nth-child(2) {
  display: none;
}

.chamber-nav a:hover,
.chamber-nav a:focus-visible {
  color: var(--ivory);
}

.entrance {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 100svh;
  padding: 112px var(--side) 80px;
  border-bottom: 1px solid var(--line);
}

.entrance::after,
.quiet-section::after {
  position: absolute;
  right: var(--side);
  bottom: 64px;
  left: var(--side);
  height: 1px;
  content: "";
  background: var(--line);
}

.entrance-content {
  width: min(880px, 100%);
  text-align: center;
}

.section-label {
  margin: 0;
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.entrance h1,
.section-heading h2,
.return-section h2,
.active-empty h2,
.chamber-title h1 {
  margin: 18px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: uppercase;
  overflow-wrap: anywhere;
}

.entrance h1 {
  display: grid;
  gap: 8px;
  font-size: clamp(3.4rem, 9vw, 9rem);
  line-height: 0.9;
}

.entrance h1 .wide-line {
  font-size: 0.84em;
}

.entrance-subtitle {
  display: grid;
  gap: 8px;
  margin: clamp(34px, 6vh, 64px) auto 0;
  color: rgba(232, 226, 216, 0.86);
  font-size: clamp(1rem, 1.5vw, 1.16rem);
  line-height: 1.8;
}

.entrance-subtitle span:first-child {
  color: var(--ivory);
  font-family: Georgia, "Times New Roman", serif;
  letter-spacing: 0.08em;
}

.entrance-copy {
  display: grid;
  gap: 28px;
  margin: clamp(44px, 8vh, 88px) auto 0;
  color: rgba(232, 226, 216, 0.78);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 2.15;
}

.entrance-copy p,
.observation-copy p,
.chambers-intro p,
.closing-copy p {
  margin: 0;
}

.line-button {
  display: inline-flex;
  align-items: center;
  gap: 20px;
  margin-top: 38px;
  padding: 13px 0;
  border-bottom: 1px solid var(--ivory);
  background: transparent;
  cursor: pointer;
  text-decoration: none;
  transition: gap 200ms ease, color 200ms ease, border-color 200ms ease;
}

.line-button:hover,
.line-button:focus-visible {
  gap: 28px;
  color: #fff;
}

.section-index {
  position: absolute;
  right: var(--side);
  bottom: 28px;
  margin: 0;
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.68rem;
  text-transform: uppercase;
}

.quiet-section {
  position: relative;
  padding: clamp(112px, 15vw, 210px) var(--side);
  border-bottom: 1px solid var(--line);
}

.section-heading {
  display: grid;
  gap: 18px;
  width: min(1050px, 100%);
  margin: 0 auto clamp(56px, 8vw, 100px);
}

.section-heading h2 {
  display: grid;
  gap: 10px;
  font-size: clamp(2.6rem, 6vw, 6rem);
  line-height: 0.98;
}

.section-heading h2 span:last-child,
.chamber-title h1 span:last-child {
  color: var(--muted);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1rem, 1.8vw, 1.45rem);
  line-height: 1.5;
  text-transform: none;
}

.origin-track,
.active-shell {
  width: min(1050px, 100%);
  margin: 0 auto;
}

.track-meta {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 28px;
}

.track-meta h3 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.8rem, 3.3vw, 3.2rem);
  font-weight: 400;
  line-height: 1.08;
}

.poison-name {
  margin: 0;
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.video-frame {
  position: relative;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #020202;
  aspect-ratio: 16 / 9;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.observation-copy {
  display: grid;
  gap: 34px;
  width: min(760px, 100%);
  margin-top: clamp(44px, 7vw, 80px);
  color: rgba(232, 226, 216, 0.78);
  font-size: clamp(1.03rem, 1.45vw, 1.2rem);
  line-height: 2.08;
}

.chambers-intro {
  display: grid;
  gap: 30px;
  width: min(760px, 100%);
  margin: 0 auto clamp(56px, 8vw, 96px);
  color: rgba(232, 226, 216, 0.78);
  font-size: clamp(1.05rem, 1.6vw, 1.26rem);
  line-height: 2.08;
}

.door-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 26px);
  width: min(940px, 100%);
  margin: 0 auto;
}

.chamber-door {
  position: relative;
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 14px;
  min-height: 220px;
  padding: clamp(28px, 4vw, 44px);
  overflow: hidden;
  border: 1px solid rgba(232, 226, 216, 0.2);
  border-radius: 6px;
  --door-image: linear-gradient(#090909, #090909);
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.34), rgba(0, 0, 0, 0.78)),
    radial-gradient(circle at 74% 72%, rgba(125, 31, 31, 0.2), transparent 38%),
    var(--door-image),
    #090909;
  background-position: center;
  background-size: cover;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    inset 0 -22px 38px rgba(0, 0, 0, 0.26),
    0 18px 44px rgba(0, 0, 0, 0.32);
  color: var(--ivory);
  cursor: pointer;
  text-decoration: none;
  text-align: left;
  transform: translateY(0);
  transition: background 220ms ease, border-color 220ms ease, box-shadow 220ms ease, color 220ms ease, transform 220ms ease;
}

.chamber-door::before {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.78), rgba(0, 0, 0, 0.44) 46%, rgba(0, 0, 0, 0.62)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent 28%, rgba(0, 0, 0, 0.28));
  content: "";
  pointer-events: none;
  transition: opacity 220ms ease;
}

.chamber-door::after {
  position: absolute;
  top: 18px;
  right: 20px;
  width: 28px;
  height: 28px;
  border-top: 1px solid rgba(232, 226, 216, 0.36);
  border-right: 1px solid rgba(232, 226, 216, 0.36);
  content: "";
  opacity: 0.64;
  transform: translate(-4px, 4px) rotate(45deg);
  transition: opacity 220ms ease, transform 220ms ease;
}

.chamber-door[data-chamber-key="chronoa"] {
  --door-image: url("./assets/door-chronoa.jpg");
}

.chamber-door[data-chamber-key="rezel"] {
  --door-image: url("./assets/door-rezel.jpg");
}

.chamber-door[data-chamber-key="vells"] {
  --door-image: url("./assets/door-vells.jpg");
}

.chamber-door[data-chamber-key="lacrevex"] {
  --door-image: url("./assets/door-lacrevex.jpg");
}

.chamber-door > span {
  position: relative;
  z-index: 2;
}

.chamber-door:hover,
.chamber-door:focus-visible {
  border-color: rgba(232, 226, 216, 0.42);
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.22), rgba(0, 0, 0, 0.68)),
    radial-gradient(circle at 74% 72%, rgba(125, 31, 31, 0.28), transparent 40%),
    var(--door-image),
    #0d0d0d;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    inset 0 -18px 34px rgba(0, 0, 0, 0.22),
    0 24px 56px rgba(0, 0, 0, 0.42);
  transform: translateY(-3px);
}

.chamber-door:hover::before,
.chamber-door:focus-visible::before {
  opacity: 0.82;
}

.chamber-door:hover::after,
.chamber-door:focus-visible::after {
  opacity: 1;
  transform: translate(0, 0) rotate(45deg);
}

.door-name {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.65rem, 3vw, 2.6rem);
  line-height: 1;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.82);
}

.door-jp {
  color: var(--muted);
  font-size: 0.9rem;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.78);
}

.door-copy {
  align-self: end;
  color: rgba(232, 226, 216, 0.72);
  font-size: 0.95rem;
  line-height: 1.85;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.84);
}

.active-chamber {
  background: var(--black-soft);
}

.active-shell,
.chamber-page-room {
  min-height: 360px;
}

.active-empty {
  display: grid;
  place-items: center;
  min-height: 300px;
  border: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

.active-empty h2 {
  color: var(--ivory);
  font-size: clamp(2.2rem, 5vw, 5rem);
}

.active-empty p {
  margin: 20px 0 0;
}

.active-content {
  opacity: 0;
  transform: translateY(12px);
}

.active-content.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 520ms ease, transform 520ms ease;
}

.chamber-title {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 420px);
  gap: clamp(32px, 6vw, 88px);
  align-items: end;
  margin-bottom: clamp(52px, 8vw, 90px);
}

.chamber-title h1 {
  display: grid;
  gap: 10px;
  font-size: clamp(3rem, 7vw, 7rem);
  line-height: 0.94;
}

.chamber-description {
  margin: 0;
  color: rgba(232, 226, 216, 0.74);
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 2;
}

.track-list {
  display: grid;
  gap: clamp(64px, 9vw, 110px);
}

.sound-track {
  display: grid;
  gap: 28px;
}

.sound-track-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: end;
}

.sound-track-header h3 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.8rem, 3.5vw, 3.4rem);
  font-weight: 400;
  line-height: 1.08;
}

.track-count {
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.track-impression {
  margin: -8px 0 0;
  color: var(--muted);
  line-height: 1.9;
}

.track-observation {
  width: min(760px, 100%);
  margin: 8px 0 0;
  color: rgba(232, 226, 216, 0.78);
  font-size: clamp(1rem, 1.45vw, 1.16rem);
  line-height: 2;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.74rem;
}

.tag-list span::before {
  margin-right: 6px;
  color: var(--red);
  content: "/";
}

.no-tracks {
  display: grid;
  place-items: center;
  min-height: 260px;
  border: 1px solid var(--line);
  color: var(--muted);
  line-height: 1.9;
  text-align: center;
}

.residual-silence {
  background: #070707;
}

.closing-copy {
  display: grid;
  gap: 42px;
  width: min(720px, 100%);
  margin: 0 auto;
  color: rgba(232, 226, 216, 0.78);
  font-size: clamp(1.04rem, 1.55vw, 1.22rem);
  line-height: 2.1;
}

.return-section {
  display: grid;
  place-items: center;
  min-height: 100svh;
  padding: 120px var(--side);
  text-align: center;
}

.return-content {
  width: min(720px, 100%);
}

.return-section h2 {
  font-size: clamp(4rem, 10vw, 8rem);
  line-height: 0.92;
}

.return-section .closing-copy {
  margin-top: clamp(54px, 8vw, 88px);
}

.return-link {
  margin-top: 58px;
}

.chamber-page {
  background: var(--black-soft);
}

.chamber-page-main {
  min-height: 100svh;
}

.chamber-page-room {
  position: relative;
  padding: clamp(130px, 16vw, 220px) var(--side) clamp(100px, 12vw, 160px);
}

.chamber-page-room::after {
  position: absolute;
  right: var(--side);
  bottom: 64px;
  left: var(--side);
  height: 1px;
  content: "";
  background: var(--line);
}

.chamber-return {
  width: max-content;
  margin: 58px auto 0;
}

.site-credit {
  padding: 28px var(--side) 42px;
  border-top: 1px solid var(--line);
  color: rgba(154, 145, 136, 0.72);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  line-height: 1.6;
  text-align: left;
}

.site-credit p {
  width: min(1050px, 100%);
  margin: 0 auto;
}

.noscript-message {
  position: fixed;
  right: 20px;
  bottom: 20px;
  left: 20px;
  z-index: 100;
  margin: 0;
  padding: 16px;
  background: var(--red);
  text-align: center;
}

@media (max-width: 780px) {
  .site-header {
    min-height: 58px;
  }

  .site-mark span:last-child {
    display: none;
  }

  .chamber-nav {
    gap: 12px;
    font-size: 0.62rem;
  }

  .chamber-nav a:nth-child(2) {
    display: none;
  }

  .entrance {
    padding-top: 86px;
  }

  .entrance h1 {
    gap: 6px;
    font-size: clamp(2.3rem, 12.5vw, 4.25rem);
    line-height: 0.96;
  }

  .section-label {
    font-size: 0.64rem;
    letter-spacing: 0.13em;
  }

  .entrance-subtitle,
  .entrance-copy,
  .observation-copy,
  .chambers-intro,
  .closing-copy,
  .track-observation {
    font-size: clamp(0.92rem, 3.9vw, 1.03rem);
  }

  .observation-copy,
  .chambers-intro,
  .closing-copy {
    width: calc(100% - clamp(18px, 7vw, 42px));
    margin-right: 0;
    margin-left: clamp(18px, 7vw, 42px);
  }

  .section-heading h2 {
    font-size: clamp(2.15rem, 11vw, 3.8rem);
    line-height: 1;
  }

  .track-meta,
  .sound-track-header {
    align-items: start;
    grid-template-columns: 1fr;
  }

  .track-meta {
    display: grid;
  }

  .track-meta h3,
  .sound-track-header h3 {
    font-size: clamp(1.48rem, 7.8vw, 2.3rem);
    line-height: 1.12;
    overflow-wrap: anywhere;
  }

  .door-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .chamber-door {
    gap: 10px;
    min-height: 190px;
    padding: clamp(20px, 5vw, 28px);
  }

  .chamber-door::before {
    inset: 0;
  }

  .chamber-door::after {
    top: 14px;
    right: 14px;
    width: 18px;
    height: 18px;
  }

  .door-name {
    font-size: clamp(1.18rem, 6.6vw, 1.85rem);
  }

  .door-jp {
    font-size: 0.82rem;
  }

  .door-copy {
    font-size: clamp(0.78rem, 3.45vw, 0.9rem);
    line-height: 1.7;
  }

  .chamber-title {
    grid-template-columns: 1fr;
  }

  .chamber-title h1 {
    font-size: clamp(2.35rem, 12vw, 4.1rem);
  }

  .return-section h2 {
    font-size: clamp(3.15rem, 15vw, 5rem);
  }

  .chamber-page .chamber-nav a:not(:first-child) {
    display: none;
  }
}

@media (max-width: 460px) {
  :root {
    --side: clamp(16px, 4.5vw, 20px);
  }

  .site-header {
    min-height: 56px;
  }

  .entrance {
    min-height: 100svh;
    padding-top: 78px;
    padding-bottom: 64px;
  }

  .entrance h1 {
    font-size: clamp(1.9rem, 9.7vw, 2.65rem);
    line-height: 1;
  }

  .entrance h1 .wide-line {
    font-size: 0.78em;
  }

  .entrance-subtitle {
    margin-top: 28px;
  }

  .entrance-copy {
    gap: 22px;
    margin-top: 34px;
    line-height: 1.95;
  }

  .section-heading h2 {
    font-size: clamp(2rem, 10.2vw, 3rem);
  }

  .observation-copy,
  .chambers-intro,
  .closing-copy {
    width: calc(100% - 28px);
    margin-left: 28px;
  }

  .track-meta h3 {
    font-size: clamp(1.42rem, 7.1vw, 2rem);
  }

  .video-frame {
    margin-inline: calc(var(--side) * -0.35);
    width: calc(100% + var(--side) * 0.7);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}