:root {
  --panel-bg: rgba(11, 17, 23, 0.72);
  --panel-border: rgba(255, 255, 255, 0.12);
  --panel-shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
  --accent: #8fd6ff;
  --accent-strong: #4eb8f2;
  --text-muted: #9ca7b6;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  height: 100%;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #101317;
  color: #edf2f7;
}

button {
  font: inherit;
}

#app {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  height: 100%;
}

#sidebar {
  overflow: auto;
  padding: 18px;
  background:
    radial-gradient(circle at top, rgba(78, 184, 242, 0.12), transparent 42%),
    linear-gradient(180deg, #171d24 0%, #0f141a 100%);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

#brand {
  margin-bottom: 14px;
}

#summary {
  color: #a8b3c2;
  line-height: 1.5;
  margin-bottom: 20px;
}

.section-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #7f8a99;
  margin: 18px 0 10px;
}

#scene-list {
  display: grid;
  gap: 14px;
}

.room-group {
  display: grid;
  gap: 8px;
  padding: 10px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.room-group.active {
  border-color: rgba(143, 214, 255, 0.28);
  background: rgba(85, 170, 220, 0.08);
}

.room-group-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 2px 2px 0;
}

.room-group-title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
}

.room-group-meta {
  color: var(--text-muted);
  font-size: 12px;
  white-space: nowrap;
}

.room-group-scenes {
  display: grid;
  gap: 8px;
}

.scene-item {
  width: 100%;
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  text-align: left;
  background: rgba(255, 255, 255, 0.05);
  color: inherit;
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 10px;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.scene-item:hover {
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  transform: translateX(2px);
}

.scene-item.active {
  border-color: var(--accent);
  background: rgba(85, 170, 220, 0.18);
}

.scene-item-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  overflow: hidden;
  background:
    radial-gradient(circle at top right, rgba(143, 214, 255, 0.28), transparent 40%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.03));
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.scene-item-thumb img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.scene-item-thumb-fallback::after {
  content: "PANO";
  position: absolute;
  right: 8px;
  bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.52);
}

.scene-item-body {
  min-width: 0;
}

.scene-item-kicker {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #7f8a99;
  margin-bottom: 6px;
}

.scene-item-title {
  font-weight: 600;
  line-height: 1.35;
}

.scene-item-meta {
  margin-top: 4px;
  color: var(--text-muted);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.usage {
  color: var(--text-muted);
  line-height: 1.7;
  font-size: 14px;
}

#viewer-shell {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at top, rgba(78, 184, 242, 0.09), transparent 35%),
    #0a0f14;
}

#viewer {
  position: absolute;
  inset: 0;
}

#hud {
  position: absolute;
  left: 20px;
  bottom: 20px;
  z-index: 3;
  max-width: min(540px, calc(100% - 40px));
  padding: 15px 17px;
  border-radius: 16px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(14px);
  box-shadow: var(--panel-shadow);
}

#scene-title {
  font-size: 24px;
  font-weight: 700;
}

#scene-meta {
  margin-top: 6px;
  color: #afbac8;
}

#hotspots {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}

.hotspot {
  position: absolute;
  transform: translate(-50%, -50%);
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(10, 18, 25, 0.86);
  color: #f4f7fb;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.28);
  transition: background 160ms ease, transform 160ms ease;
}

.hotspot::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(143, 214, 255, 0.18);
}

.hotspot:hover {
  background: rgba(17, 29, 39, 0.96);
}

#viewer-controls {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.floating-button,
.ghost-button {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(11, 17, 23, 0.8);
  color: #edf2f7;
  padding: 10px 14px;
  cursor: pointer;
  backdrop-filter: blur(12px);
}

.floating-button:hover,
.ghost-button:hover {
  background: rgba(18, 27, 36, 0.92);
}

#toggle-language {
  min-width: 76px;
  text-align: center;
}

#toggle-sidebar {
  display: none;
}

#plan-panel {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 5;
  width: min(280px, calc(100% - 28px));
  padding: 14px;
  border-radius: 18px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(14px);
  transition: transform 180ms ease, opacity 180ms ease;
}

#plan-panel.hidden {
  display: none;
}

#plan-panel.collapsed {
  width: auto;
  padding: 12px 14px;
}

#plan-panel.collapsed #plan-stage,
#plan-panel.collapsed #plan-caption {
  display: none;
}

.plan-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.plan-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

#plan-caption {
  margin-top: 4px;
  color: var(--text-muted);
  font-size: 13px;
}

#plan-stage {
  position: relative;
  margin-top: 12px;
  width: 100%;
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01)),
    #0e141a;
}

#plan-image {
  position: absolute;
  display: block;
  object-fit: fill;
  border-radius: 12px;
}

#plan-spots {
  position: absolute;
  inset: 0;
}

.plan-spot {
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.92);
  border-radius: 50%;
  background: var(--accent-strong);
  box-shadow: 0 0 0 0 rgba(78, 184, 242, 0.32);
  transform: translate(-50%, -50%);
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.plan-spot:hover {
  transform: translate(-50%, -50%) scale(1.12);
  box-shadow: 0 0 0 6px rgba(78, 184, 242, 0.18);
}

.plan-spot.active {
  background: #ffffff;
  box-shadow: 0 0 0 7px rgba(143, 214, 255, 0.22);
  transform: translate(-50%, -50%) scale(1.16);
}

@media (max-width: 900px) {
  #app {
    grid-template-columns: 1fr;
  }

  #sidebar {
    position: absolute;
    z-index: 6;
    inset: 0 auto 0 0;
    width: min(320px, 82vw);
    transform: translateX(-100%);
    transition: transform 180ms ease;
  }

  #sidebar.open {
    transform: translateX(0);
  }

  #toggle-sidebar {
    display: inline-block;
  }

  #plan-panel {
    top: auto;
    bottom: 14px;
    right: 14px;
    width: min(250px, calc(100% - 28px));
  }

  #hud {
    right: 20px;
    max-width: none;
  }

  .scene-item {
    grid-template-columns: 96px minmax(0, 1fr);
  }

  .room-group {
    padding: 8px;
  }

  #viewer-controls {
    max-width: calc(100% - 28px);
  }
}