.building3d-source {
  position: relative;
  cursor: pointer;
}

.building3d-source::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 55%, rgba(3, 14, 20, .7));
}

.building3d-trigger {
  position: absolute;
  left: 18px;
  bottom: 42px;
  z-index: 5;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid rgba(79, 215, 255, .72);
  background: rgba(4, 20, 28, .88);
  color: #eaf9ff;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  box-shadow: 0 12px 35px rgba(0, 0, 0, .28);
}

.building3d-trigger::before {
  content: "◇";
  margin-right: 9px;
  color: #4fd7ff;
}

body.font-editing .building3d-trigger { pointer-events: none; opacity: .45; }
body.building3d-open { overflow: hidden; }

.building3d-modal[hidden] { display: none !important; }
.building3d-modal {
  position: fixed;
  inset: 0;
  z-index: 12000;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(1, 8, 12, .92);
  backdrop-filter: blur(12px);
  color: #eaf8fb;
}

.building3d-shell {
  width: min(1500px, 96vw);
  height: min(900px, 94vh);
  display: grid;
  grid-template-rows: 64px minmax(0, 1fr);
  border: 1px solid rgba(79, 215, 255, .38);
  background: #06141b;
  box-shadow: 0 30px 90px rgba(0, 0, 0, .55);
}

.building3d-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 18px 0 24px;
  border-bottom: 1px solid rgba(79, 215, 255, .25);
  background: rgba(7, 27, 36, .96);
}

.building3d-title { min-width: 0; flex: 1; }
.building3d-kicker { color: #4fd7ff; font-size: 11px; font-weight: 800; text-transform: uppercase; }
.building3d-title strong { display: block; margin-top: 2px; font-size: 20px; letter-spacing: 0; }
.building3d-header button,
.building3d-tabs button {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid rgba(132, 207, 228, .28);
  background: rgba(10, 35, 46, .8);
  color: #dff7ff;
  font: inherit;
  cursor: pointer;
}
.building3d-header button:hover,
.building3d-tabs button:hover,
.building3d-tabs button.active { border-color: #4fd7ff; color: #fff; background: rgba(79, 215, 255, .14); }
.building3d-close { width: 42px; padding: 0 !important; font-size: 24px !important; }

.building3d-main {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 350px;
}

.building3d-stage {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background:
    linear-gradient(rgba(79, 215, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 215, 255, .035) 1px, transparent 1px),
    radial-gradient(circle at 50% 42%, rgba(44, 123, 145, .22), transparent 58%),
    #041016;
  background-size: 64px 64px, 64px 64px, auto, auto;
  touch-action: none;
}

.building3d-canvas-host { position: absolute; inset: 0; }
.building3d-canvas-host canvas { display: block; width: 100%; height: 100%; }
.building3d-stage-note {
  position: absolute;
  left: 20px;
  bottom: 18px;
  z-index: 3;
  color: rgba(222, 244, 250, .68);
  font-size: 12px;
  pointer-events: none;
}

.building3d-callout {
  position: absolute;
  z-index: 4;
  min-width: 92px;
  padding: 7px 10px;
  border-left: 2px solid #4fd7ff;
  background: rgba(3, 17, 24, .82);
  color: #edfaff;
  font-size: 12px;
  line-height: 1.3;
  pointer-events: none;
  transform: translate(12px, -50%);
  transition: opacity .25s ease;
}
.building3d-callout::before {
  content: "";
  position: absolute;
  right: 100%;
  top: 50%;
  width: 28px;
  border-top: 1px solid rgba(79, 215, 255, .75);
}
.building3d-callout.muted { opacity: .28; }

.building3d-panel {
  min-height: 0;
  overflow: auto;
  padding: 22px;
  border-left: 1px solid rgba(79, 215, 255, .22);
  background: rgba(5, 22, 29, .98);
}
.building3d-tabs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-bottom: 22px; }
.building3d-info h3 { margin: 0 0 8px; font-size: 26px; color: #fff; }
.building3d-info .meta { color: #4fd7ff; font-size: 14px; margin-bottom: 18px; }
.building3d-info p { margin: 0 0 14px; color: #b8cdd4; font-size: 15px; line-height: 1.65; }
.building3d-info ul { margin: 0; padding: 0; list-style: none; }
.building3d-info li { padding: 10px 0; border-bottom: 1px solid rgba(132, 207, 228, .13); color: #d8e9ed; font-size: 14px; line-height: 1.45; }
.building3d-metric-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 18px; }
.building3d-metric { padding: 12px; border: 1px solid rgba(79, 215, 255, .2); background: rgba(9, 34, 44, .58); }
.building3d-metric strong { display: block; color: #fff; font-size: 18px; }
.building3d-metric span { color: #8faab2; font-size: 11px; }
.building3d-fallback { position: absolute; inset: 0; display: none; align-items: flex-end; padding: 24px; background: center / cover no-repeat url("render-perspective.png"); }
.building3d-fallback.visible { display: flex; }
.building3d-fallback p { max-width: 520px; padding: 14px 18px; margin: 0; background: rgba(3, 16, 22, .86); }

@media (max-width: 900px) {
  .building3d-modal { padding: 0; }
  .building3d-shell { width: 100vw; height: 100dvh; border: 0; }
  .building3d-header { padding: 0 10px 0 14px; gap: 7px; }
  .building3d-title strong { font-size: 15px; }
  .building3d-kicker { display: none; }
  .building3d-header button { min-height: 34px; padding: 0 9px; font-size: 12px; }
  .building3d-main { grid-template-columns: 1fr; grid-template-rows: minmax(48%, 1fr) minmax(220px, 42%); }
  .building3d-panel { border-left: 0; border-top: 1px solid rgba(79, 215, 255, .22); padding: 14px 16px 20px; }
  .building3d-tabs { grid-template-columns: repeat(4, 1fr); margin-bottom: 12px; }
  .building3d-tabs button { min-height: 34px; padding: 0 5px; font-size: 12px; }
  .building3d-info h3 { font-size: 20px; }
  .building3d-info p, .building3d-info li { font-size: 12px; }
  .building3d-callout { font-size: 10px; min-width: 72px; }
}

@media (max-width: 900px) and (orientation: landscape) {
  .building3d-shell { grid-template-rows: 52px minmax(0, 1fr); }
  .building3d-main { grid-template-columns: minmax(0, 1fr) 310px; grid-template-rows: 1fr; }
  .building3d-panel { border-top: 0; border-left: 1px solid rgba(79, 215, 255, .22); }
  .building3d-tabs { grid-template-columns: repeat(2, 1fr); }
}