:root {
  color-scheme: dark;
  --ink: #060a14;
  --navy: #0a1020;
  --blue-gray: #8390a8;
  --off-white: #edf0ea;
  --cobalt: #4269c8;
  --gold: #b59a64;
  --line-color: rgba(224, 231, 237, 0.68);
  --canvas-width: max(100vw, 177.7778svh);
  --canvas-height: max(100svh, 56.25vw);
  font-family: Inter, "Helvetica Neue", "Noto Sans JP", Arial, sans-serif;
  font-synthesis: none;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
  background: var(--ink);
}

body {
  color: var(--off-white);
}

a {
  color: inherit;
}

.home {
  min-width: 320px;
  overflow: hidden;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.6rem 0.8rem;
  transform: translateY(-180%);
  background: var(--off-white);
  color: var(--ink);
  font-size: 0.75rem;
  text-decoration: none;
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-brand {
  position: fixed;
  z-index: 20;
  top: clamp(0.95rem, 3.55vw, 3.45rem);
  left: clamp(1.5rem, 4.4vw, 4.75rem);
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  margin: 0;
}

.site-brand__author {
  margin: 0 0 0.5rem;
  color: rgba(131, 144, 168, 0.68);
  font-size: clamp(0.48rem, 0.52vw, 0.57rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  line-height: 1;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.55);
}

.site-brand__title {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  color: rgba(237, 240, 234, 0.9);
  font-size: clamp(0.72rem, 0.95vw, 1rem);
  font-weight: 400;
  letter-spacing: 0.36em;
  line-height: 1;
  text-decoration: none;
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.45);
}

.site-brand__title::after {
  width: clamp(1.75rem, 3vw, 3rem);
  height: 1px;
  background: rgba(181, 154, 100, 0.72);
  box-shadow: inset 0 0 0 rgba(66, 105, 200, 0);
  content: "";
  transition: box-shadow 240ms ease;
}

.home.is-hotspot-active .site-brand__title::after {
  box-shadow: inset clamp(0.7rem, 1.25vw, 1.25rem) 0 0 rgba(66, 105, 200, 0.62);
}

.site-brand__title:focus-visible {
  outline: 1px solid var(--off-white);
  outline-offset: 0.65rem;
}

.social-links {
  display: flex;
  margin-top: 0.62rem;
  align-items: center;
}

.social-link {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  color: var(--blue-gray);
  opacity: 0.62;
  text-decoration: none;
  transition: color 200ms ease, opacity 200ms ease;
}

.social-link__icon {
  display: block;
  width: 1.06rem;
  height: 1.06rem;
  overflow: visible;
}

.social-link:is(:hover, :focus-visible) {
  color: rgba(237, 240, 234, 0.94);
  opacity: 1;
}

.social-link:focus-visible {
  outline: 1px solid rgba(66, 105, 200, 0.72);
  outline-offset: -3px;
}

.room {
  position: relative;
  isolation: isolate;
  width: 100%;
  height: 100vh;
  height: 100svh;
  min-height: 30rem;
  overflow: hidden;
  background: var(--navy);
}

.room::before,
.room::after {
  position: absolute;
  z-index: 2;
  inset: 0;
  pointer-events: none;
  content: "";
}

.room::before {
  background:
    linear-gradient(90deg, rgba(3, 6, 13, 0.58) 0%, rgba(3, 6, 13, 0.2) 23%, transparent 51%),
    linear-gradient(180deg, rgba(3, 6, 13, 0.16) 0%, transparent 42%, rgba(3, 6, 13, 0.18) 100%);
}

.room::after {
  box-shadow: inset 0 0 8rem rgba(2, 5, 12, 0.28);
}

.room__canvas {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--canvas-width);
  height: var(--canvas-height);
  transform: translate(-50%, -50%);
}

div.room__canvas {
  z-index: 0;
  animation: room-reveal 700ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.room__background {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 320ms ease;
}

.room__background.is-loaded {
  opacity: 1;
}

.room__hotspots {
  z-index: 5;
  margin: 0;
  pointer-events: none;
}

.hotspot {
  position: absolute;
  isolation: isolate;
  top: var(--y);
  left: var(--x);
  width: var(--w);
  height: var(--h);
  min-width: clamp(3.5rem, 7vw, 7rem);
  min-height: clamp(3.5rem, 7vw, 7rem);
  pointer-events: auto;
  cursor: pointer;
  text-decoration: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.hotspot::before {
  position: absolute;
  z-index: 0;
  inset: -0.75rem;
  content: "";
}

.hotspot__dot,
.hotspot__line,
.hotspot__label {
  position: absolute;
  z-index: 1;
  pointer-events: none;
}

.hotspot__dot {
  top: 50%;
  left: 50%;
  width: 4px;
  height: 4px;
  border: 1px solid rgba(237, 240, 234, 0.74);
  border-radius: 50%;
  opacity: 0;
  transform: translate(-50%, -50%);
  transition:
    opacity 120ms ease 180ms,
    background-color 120ms ease 180ms,
    border-color 120ms ease 180ms,
    box-shadow 120ms ease 180ms;
}

.hotspot__line {
  opacity: 0;
  transition:
    opacity 160ms ease 80ms,
    transform 190ms cubic-bezier(0.22, 0.72, 0.32, 1) 80ms;
}

.hotspot__label {
  display: flex;
  align-items: baseline;
  min-width: max-content;
  gap: 0.5rem;
  padding: 0.48rem 0.62rem 0.5rem;
  border: 1px solid rgba(207, 216, 225, 0.56);
  background: rgba(6, 10, 20, 0.8);
  box-shadow: inset 2px 0 0 rgba(66, 105, 200, 0);
  backdrop-filter: blur(3px);
  color: rgba(237, 240, 234, 0.94);
  font-size: 0.64rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  line-height: 1;
  opacity: 0;
  white-space: nowrap;
  transition:
    opacity 140ms ease,
    transform 170ms ease,
    border-color 170ms ease,
    box-shadow 170ms ease;
}

.hotspot__number {
  color: var(--blue-gray);
  font-size: 0.54rem;
  letter-spacing: 0.22em;
}

.hotspot__number::after {
  margin-left: 0.5rem;
  color: rgba(131, 144, 168, 0.58);
  content: "/";
}

.hotspot--left .hotspot__line {
  top: 50%;
  right: 50%;
  width: var(--line);
  height: 1px;
  background: linear-gradient(
    90deg,
    var(--line-color) 0 calc(100% - 9px),
    rgba(66, 105, 200, 0.82) calc(100% - 9px) 100%
  );
  transform: scaleX(0);
  transform-origin: right center;
}

.hotspot--left .hotspot__label {
  top: 50%;
  right: calc(50% + var(--line));
  transform: translate(0.3rem, -50%);
}

.hotspot--up .hotspot__line {
  bottom: 50%;
  left: 50%;
  width: 1px;
  height: var(--line);
  background: linear-gradient(
    180deg,
    var(--line-color) 0 calc(100% - 9px),
    rgba(66, 105, 200, 0.82) calc(100% - 9px) 100%
  );
  transform: scaleY(0);
  transform-origin: center bottom;
}

.hotspot--up .hotspot__label {
  bottom: calc(50% + var(--line));
  left: 50%;
  transform: translate(-50%, 0.3rem);
}

.hotspot:is(:hover, :focus-visible, .is-near) .hotspot__dot {
  background: var(--off-white);
  border-color: rgba(66, 105, 200, 0.9);
  box-shadow: 0 0 0 2px rgba(66, 105, 200, 0.16);
  opacity: 1;
  transition-delay: 0ms;
}

.hotspot:is(:hover, :focus-visible, .is-near) .hotspot__line {
  opacity: 1;
  transition-delay: 80ms;
}

.hotspot:is(:hover, :focus-visible, .is-near) .hotspot__label {
  border-color: rgba(207, 216, 225, 0.72);
  box-shadow: inset 2px 0 0 rgba(66, 105, 200, 0.68);
  opacity: 1;
  transition-delay: 190ms;
}

.hotspot--left:is(:hover, :focus-visible, .is-near) .hotspot__line {
  transform: scaleX(1);
}

.hotspot--left:is(:hover, :focus-visible, .is-near) .hotspot__label {
  transform: translate(0, -50%);
}

.hotspot--up:is(:hover, :focus-visible, .is-near) .hotspot__line {
  transform: scaleY(1);
}

.hotspot--up:is(:hover, :focus-visible, .is-near) .hotspot__label {
  transform: translate(-50%, 0);
}

.hotspot:focus-visible {
  outline: none;
}

.hotspot__debug {
  display: none;
}

.is-hotspot-debug .hotspot {
  background: rgba(66, 105, 200, 0.08);
  outline: 1px dashed rgba(129, 157, 222, 0.72);
  outline-offset: -1px;
}

.is-hotspot-debug .hotspot::before {
  border: 1px dotted rgba(237, 240, 234, 0.34);
  background: rgba(66, 105, 200, 0.04);
}

.is-hotspot-debug .hotspot__dot {
  background: var(--cobalt);
  border-color: var(--off-white);
  box-shadow: none;
  opacity: 1;
}

.is-hotspot-debug .hotspot__debug {
  position: absolute;
  z-index: 3;
  top: 0;
  left: 0;
  display: block;
  max-width: 14rem;
  padding: 0.3rem 0.38rem;
  background: rgba(5, 9, 18, 0.92);
  color: rgba(237, 240, 234, 0.9);
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1.35;
  pointer-events: none;
  white-space: normal;
}

.mobile-nav {
  display: none;
}

.collection-body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
  background: var(--ink);
}

.collection-body::before {
  position: fixed;
  z-index: 0;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(4, 7, 15, 0.96), rgba(4, 7, 15, 0.74)),
    url("/assets/images/room-main.webp") 68% center / cover no-repeat;
  content: "";
  filter: saturate(0.55);
  transform: scale(1.02);
}

.collection {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 100vh;
  min-height: 100svh;
  align-content: center;
  padding: clamp(2rem, 7vw, 7rem);
}

.collection__back {
  position: absolute;
  top: clamp(1.75rem, 4vw, 4rem);
  left: clamp(1.75rem, 4vw, 4rem);
  display: inline-grid;
  width: 2.6rem;
  height: 2.6rem;
  place-items: center;
  border: 1px solid rgba(207, 216, 225, 0.35);
  color: var(--off-white);
  font-size: 1rem;
  text-decoration: none;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.collection__back:is(:hover, :focus-visible) {
  border-color: rgba(237, 240, 234, 0.86);
  background: rgba(66, 105, 200, 0.13);
  outline: none;
}

.collection__number {
  margin: 0 0 0.9rem;
  color: var(--gold);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
}

.collection h1 {
  max-width: 100%;
  margin: 0;
  color: rgba(237, 240, 234, 0.94);
  font-size: clamp(1.65rem, 5vw, 4.8rem);
  font-weight: 300;
  letter-spacing: clamp(0.14em, 1.2vw, 0.28em);
  line-height: 1;
  overflow-wrap: anywhere;
}

.collection h1::after {
  display: block;
  width: clamp(3rem, 9vw, 8rem);
  height: 1px;
  margin-top: clamp(1.5rem, 3vw, 2.7rem);
  background: linear-gradient(90deg, var(--cobalt), transparent);
  content: "";
}

@keyframes room-reveal {
  from {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.012);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

@media (max-width: 760px), (hover: none) and (pointer: coarse) {
  .room {
    min-height: 32rem;
  }

  .room::before {
    background:
      linear-gradient(180deg, rgba(3, 6, 13, 0.46) 0%, transparent 25%, rgba(3, 6, 13, 0.16) 56%, rgba(3, 6, 13, 0.82) 100%),
      linear-gradient(90deg, rgba(3, 6, 13, 0.2), transparent 42%);
  }

  .room__canvas {
    transform: translate(-72%, -50%);
  }

  div.room__canvas {
    animation-name: room-reveal-mobile;
  }

  .room__hotspots {
    display: none;
  }

  .is-hotspot-debug .room__hotspots {
    display: block;
  }

  .site-brand {
    top: max(0.7rem, env(safe-area-inset-top));
    left: 1.3rem;
  }

  .site-brand__author {
    margin-bottom: 0.38rem;
    font-size: 0.47rem;
  }

  .site-brand__title {
    font-size: 0.68rem;
    letter-spacing: 0.31em;
  }

  .site-brand__title::after {
    width: 1.6rem;
  }

  .social-links {
    margin-top: 0.42rem;
  }

  .social-link {
    width: 2.5rem;
    height: 2.5rem;
  }

  .social-link:nth-child(1) .social-link__icon {
    transform: translateX(0.44rem);
  }

  .social-link:nth-child(3) .social-link__icon {
    transform: translateX(-0.44rem);
  }

  .mobile-nav {
    position: absolute;
    z-index: 10;
    right: 0;
    bottom: 0;
    left: 0;
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    padding: 0.42rem max(0.45rem, env(safe-area-inset-right)) max(0.5rem, env(safe-area-inset-bottom)) max(0.45rem, env(safe-area-inset-left));
    border-top: 1px solid rgba(207, 216, 225, 0.2);
    background: rgba(5, 9, 18, 0.76);
    backdrop-filter: blur(6px);
  }

  .mobile-nav a {
    display: flex;
    min-width: 0;
    min-height: 3.25rem;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0.45rem 0.12rem;
    color: rgba(237, 240, 234, 0.9);
    font-size: clamp(0.43rem, 1.75vw, 0.56rem);
    letter-spacing: 0.07em;
    text-decoration: none;
  }

  .mobile-nav a:last-child {
    grid-column: auto;
  }

  .mobile-nav a span {
    color: var(--blue-gray);
    font-size: 0.46rem;
  }

  .mobile-nav a:is(:active, :focus-visible) {
    background: rgba(66, 105, 200, 0.13);
    outline: 1px solid rgba(207, 216, 225, 0.44);
    outline-offset: -1px;
  }
}

@keyframes room-reveal-mobile {
  from {
    opacity: 0;
    transform: translate(-72%, -50%) scale(1.012);
  }
  to {
    opacity: 1;
    transform: translate(-72%, -50%) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
}