:root {
  color-scheme: dark;
  --ink: #f8fafc;
  --muted: #b8c2d8;
  --panel: rgba(14, 23, 42, 0.74);
  --panel-strong: rgba(9, 16, 31, 0.93);
  --line: rgba(255, 255, 255, 0.16);
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --warm: #f9b572;
  --shadow: 0 22px 70px rgba(2, 8, 23, 0.38);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body,
#app {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #dbe3ec;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
}

#room-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
  outline: none;
}

#room-canvas.is-dragging {
  cursor: grabbing;
}

#room-canvas.can-interact {
  cursor: pointer;
}

.loading {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  padding: 32px;
  color: var(--ink);
  text-align: center;
  background:
    radial-gradient(circle at 50% 32%, rgba(14, 165, 233, 0.2), transparent 31%),
    linear-gradient(145deg, #0c1427, #111c36 56%, #0a1020);
  transition: opacity 0.55s ease, visibility 0.55s ease;
}

.loading::before,
.loading::after {
  position: absolute;
  content: "";
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: white;
  box-shadow:
    8vw 12vh rgba(255,255,255,.8), 31vw -22vh rgba(255,255,255,.42),
    -34vw 4vh rgba(255,255,255,.66), -12vw -28vh rgba(255,255,255,.38),
    42vw 28vh rgba(255,255,255,.52), -45vw 31vh rgba(255,255,255,.26),
    18vw 38vh rgba(255,255,255,.4), 45vw -35vh rgba(255,255,255,.32);
}

.loading::after {
  transform: rotate(31deg) scale(0.7);
  opacity: 0.7;
}

.loading.is-hidden {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.loading__mark {
  width: 64px;
  height: 64px;
  margin-bottom: 18px;
  border: 1px solid rgba(125, 211, 252, 0.42);
  border-radius: 50%;
  color: var(--accent);
  font-size: 30px;
  line-height: 60px;
  animation: breathe 1.8s ease-in-out infinite;
}

.loading__eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
}

.loading h1 {
  margin: 0;
  font-size: clamp(25px, 5vw, 42px);
  font-weight: 650;
  letter-spacing: 0.04em;
}

.loading__track {
  width: min(310px, 72vw);
  height: 3px;
  margin-top: 28px;
  overflow: hidden;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.12);
}

.loading__track span {
  display: block;
  width: 8%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-strong), #c4b5fd);
  transition: width 0.25s ease;
}

#loading-status {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
}

@keyframes breathe {
  50% { transform: scale(1.08); box-shadow: 0 0 38px rgba(56, 189, 248, 0.22); }
}

.topbar {
  position: fixed;
  z-index: 20;
  top: max(16px, env(safe-area-inset-top));
  left: max(16px, env(safe-area-inset-left));
  right: max(16px, env(safe-area-inset-right));
  display: flex;
  align-items: center;
  gap: 12px;
  pointer-events: none;
}

.topbar > * {
  pointer-events: auto;
}

.topbar__title {
  display: grid;
  min-width: 0;
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--ink);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(130%);
}

.topbar__title span {
  overflow: hidden;
  font-size: 15px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar__title small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.topbar__actions {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.icon-button,
.plain-button,
.tour-nav button {
  border: 0;
  cursor: pointer;
}

.icon-button {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--ink);
  background: var(--panel);
  box-shadow: var(--shadow);
  text-decoration: none;
  backdrop-filter: blur(18px) saturate(130%);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.icon-button:hover,
.icon-button:focus-visible {
  border-color: rgba(125, 211, 252, 0.7);
  background: rgba(22, 38, 65, 0.9);
  transform: translateY(-1px);
  outline: none;
}

.scene-label {
  position: fixed;
  z-index: 15;
  right: max(20px, env(safe-area-inset-right));
  bottom: calc(112px + env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: min(420px, calc(100vw - 40px));
  padding: 11px 14px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  color: var(--ink);
  background: rgba(10, 17, 31, 0.66);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.scene-label > span {
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}

.scene-label div {
  display: grid;
  min-width: 0;
}

.scene-label strong {
  font-size: 14px;
}

.scene-label small {
  overflow: hidden;
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.interaction-hint {
  position: fixed;
  z-index: 18;
  top: 50%;
  left: 50%;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 99px;
  color: var(--ink);
  background: rgba(8, 15, 29, 0.78);
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 18px);
  transition: opacity 0.18s ease, transform 0.18s ease;
  backdrop-filter: blur(12px);
}

.interaction-hint.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.mobile-controls {
  position: fixed;
  z-index: 21;
  left: max(14px, env(safe-area-inset-left));
  bottom: calc(112px + env(safe-area-inset-bottom));
  display: block;
  gap: 4px;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(10, 17, 31, 0.68);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px) saturate(140%);
  touch-action: none;
}

.mobile-controls__row {
  display: flex;
  justify-content: center;
  gap: 4px;
}

.mobile-controls button {
  width: 38px;
  height: 38px;
  border: 1px solid rgba(186, 230, 253, 0.3);
  border-radius: 11px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.08);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  font-weight: 700;
  touch-action: none;
  user-select: none;
}

.mobile-controls button:active,
.mobile-controls button.is-pressed {
  color: #06121d;
  background: linear-gradient(135deg, #bae6fd, #7dd3fc);
}

.mobile-controls button:focus-visible {
  outline: 2px solid #7dd3fc;
  outline-offset: 2px;
}

.tour-nav {
  position: fixed;
  z-index: 20;
  right: 50%;
  bottom: max(18px, env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  gap: 7px;
  max-width: calc(100vw - 24px);
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-strong);
  box-shadow: var(--shadow);
  transform: translateX(50%);
  backdrop-filter: blur(20px) saturate(140%);
}

.tour-nav__stops {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.tour-nav__stops::-webkit-scrollbar {
  display: none;
}

.tour-nav button {
  min-height: 46px;
  border-radius: 12px;
  background: transparent;
}

.tour-nav__arrow {
  flex: 0 0 38px;
  color: var(--muted);
  font-size: 27px;
  line-height: 1;
}

.tour-nav__arrow:hover,
.tour-nav__arrow:focus-visible {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.08);
  outline: none;
}

.tour-stop {
  display: grid;
  min-width: 76px;
  padding: 6px 12px;
  color: var(--muted);
  text-align: left;
  transition: color 0.2s ease, background 0.2s ease;
}

.tour-stop span {
  color: currentColor;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 9px;
  opacity: 0.72;
}

.tour-stop strong {
  margin-top: 1px;
  font-size: 12px;
  white-space: nowrap;
}

.tour-stop:hover,
.tour-stop:focus-visible {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.07);
  outline: none;
}

.tour-stop.is-active {
  color: #06121d;
  background: linear-gradient(135deg, #bae6fd, #7dd3fc);
}

.help-panel {
  position: fixed;
  z-index: 30;
  top: 72px;
  right: max(16px, env(safe-area-inset-right));
  width: min(330px, calc(100vw - 32px));
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  color: var(--ink);
  background: var(--panel-strong);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px) scale(0.98);
  transition: opacity 0.2s ease, transform 0.2s ease;
  backdrop-filter: blur(22px);
}

.help-panel.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.help-panel__head,
.content-modal header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.help-panel ul {
  margin: 14px 0 0;
  padding-left: 1.25em;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.85;
}

.plain-button {
  display: grid;
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.07);
  font-size: 22px;
}

.plain-button:hover,
.plain-button:focus-visible {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.13);
  outline: none;
}

.content-modal {
  position: fixed;
  z-index: 80;
  inset: 0;
  display: grid;
  place-items: center;
  padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right))
    max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.22s ease, visibility 0.22s ease;
}

.content-modal.is-open {
  visibility: visible;
  opacity: 1;
}

.content-modal__backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: rgba(3, 8, 19, 0.72);
  backdrop-filter: blur(10px);
}

.content-modal__card {
  position: relative;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  width: min(1040px, 100%);
  height: min(820px, 100%);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 22px;
  color: var(--ink);
  background: #111a2b;
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.52);
  transform: translateY(12px) scale(0.985);
  transition: transform 0.22s ease;
}

.content-modal.is-open .content-modal__card {
  transform: translateY(0) scale(1);
}

.content-modal header {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}

.content-modal header small {
  display: block;
  margin-bottom: 3px;
  color: var(--accent);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.content-modal h2 {
  margin: 0;
  font-size: clamp(18px, 3vw, 25px);
}

.content-modal__body {
  min-height: 0;
  background: #dbe2e9;
}

.content-modal__body iframe,
.content-modal__body img {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.content-modal__body img {
  object-fit: contain;
  background: #0b1220;
}

.equipment-info {
  display: grid;
  align-content: center;
  min-height: 100%;
  padding: clamp(28px, 6vw, 76px);
  color: #dce8f3;
  background:
    radial-gradient(circle at 82% 14%, rgba(56, 189, 248, .17), transparent 32%),
    linear-gradient(145deg, #101a2c, #0b1220);
}

.equipment-info p {
  max-width: 760px;
  margin: 0 0 24px;
  color: #9fb2c8;
  font-size: clamp(14px, 2vw, 17px);
  line-height: 1.8;
}

.equipment-sources a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.equipment-info ul {
  display: grid;
  gap: 14px;
  max-width: 780px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.equipment-info li {
  padding: 14px 17px;
  border: 1px solid rgba(125, 211, 252, .18);
  border-radius: 12px;
  background: rgba(20, 37, 59, .66);
  font-size: clamp(14px, 2vw, 17px);
  line-height: 1.55;
}

.equipment-info li::before {
  margin-right: 10px;
  color: var(--accent);
  content: "✦";
}

.content-modal footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 18px;
  border-top: 1px solid var(--line);
}

.content-modal footer p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.modal-open {
  flex: 0 0 auto;
  padding: 9px 13px;
  border-radius: 10px;
  color: #07111d;
  background: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
}

.modal-open[hidden] {
  display: none;
}

.no-script {
  position: fixed;
  z-index: 200;
  inset: 20px;
  display: grid;
  place-items: center;
  color: #111827;
  background: white;
}

@media (max-width: 720px) {
  .topbar {
    top: max(10px, env(safe-area-inset-top));
    left: max(10px, env(safe-area-inset-left));
    right: max(10px, env(safe-area-inset-right));
  }

  .topbar__title {
    padding: 8px 11px;
  }

  .topbar__title small {
    display: none;
  }

  .icon-button {
    width: 40px;
    height: 40px;
    border-radius: 12px;
  }

  .scene-label {
    right: max(12px, env(safe-area-inset-right));
    bottom: calc(98px + env(safe-area-inset-bottom));
    left: auto;
    max-width: none;
    padding: 9px 12px;
  }

  .tour-nav {
    right: max(8px, env(safe-area-inset-right));
    left: max(8px, env(safe-area-inset-left));
    justify-content: stretch;
    transform: none;
  }

  .tour-nav__stops {
    flex: 1;
  }

  .tour-stop {
    min-width: 66px;
    flex: 1 0 66px;
    padding-inline: 9px;
  }

  .tour-nav__arrow {
    display: none;
  }

  .content-modal {
    padding: 0;
  }

  .content-modal__card {
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: 0;
  }

  .content-modal footer {
    align-items: flex-start;
    padding-bottom: max(12px, env(safe-area-inset-bottom));
  }
}

@media (max-width: 430px) {
  .topbar__title {
    max-width: 150px;
  }

  .scene-label small {
    display: none;
  }

  .tour-stop span {
    display: none;
  }

  .tour-stop {
    place-items: center;
    text-align: center;
  }

  .content-modal footer p {
    display: none;
  }
}

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