:root {
  --bg: #232b36;
  --panel: #2b3542;
  --panel-border: #3a4656;
  --text: #e4e9f0;
  --text-dim: #9aa7b8;
  --accent: #4da3ff;
  --accent-dark: #2f7fd6;
  --danger: #e05d5d;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

#app { position: fixed; inset: 0; }
#app canvas { display: block; }

/* ---------- top bar ---------- */

#topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 48px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  background: rgba(35, 43, 54, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--panel-border);
  z-index: 20;
}

#title { font-weight: 600; letter-spacing: 0.3px; }
.spacer { flex: 1; }
.sep { width: 1px; height: 24px; background: var(--panel-border); }

button, select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: 0.4; cursor: default; }
button.primary { background: var(--accent-dark); border-color: var(--accent-dark); }
button.primary:hover { background: var(--accent); }
button.danger { color: #ffb3b3; }
button.danger:hover { border-color: var(--danger); }

.scale-label { display: flex; align-items: center; gap: 6px; color: var(--text-dim); font-size: 12px; }
.scale-label select { padding: 4px 6px; }

/* ---------- side panel ---------- */

#panel {
  position: fixed;
  top: 56px;
  left: 8px;
  width: 250px;
  max-height: calc(100% - 120px);
  overflow-y: auto;
  background: rgba(43, 53, 66, 0.94);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 12px;
  z-index: 15;
}

.panel-section { margin-bottom: 16px; }
.panel-section:last-child { margin-bottom: 0; }
.panel-section h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.row { display: flex; gap: 8px; align-items: center; }
.row .grow { flex: 1; display: flex; align-items: center; gap: 6px; color: var(--text-dim); font-size: 12px; }
.row select { flex: 1; }

#objectList { list-style: none; }
#objectList li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid transparent;
}
#objectList li:hover { background: rgba(255, 255, 255, 0.05); }
#objectList li.selected { border-color: var(--accent); background: rgba(77, 163, 255, 0.12); }
#objectList li.empty { color: var(--text-dim); cursor: default; font-style: italic; }
#objectList li button { padding: 2px 8px; font-size: 12px; }

/* ---------- editor fields ---------- */

.field { margin-bottom: 10px; }
.field > label { display: block; font-size: 12px; color: var(--text-dim); margin-bottom: 4px; }
.field input[type="range"] { width: 100%; accent-color: var(--accent); }
.field input[type="number"], .field input[type="color"] {
  width: 100%;
  padding: 5px 6px;
  background: #1f2732;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  color: var(--text);
}
.field input[type="color"] { padding: 2px; height: 30px; }
.field .vec3 { display: flex; gap: 6px; }
.field .vec3 input { width: 0; flex: 1; }

/* ---------- progress overlay ---------- */

#progress {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: min(420px, 80vw);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 18px;
  z-index: 40;
  text-align: center;
}
#progressLabel { margin-bottom: 10px; color: var(--text-dim); }
#progressTrack {
  height: 8px;
  background: #1f2732;
  border-radius: 4px;
  overflow: hidden;
}
#progressBar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.15s ease;
}

/* ---------- camera info ---------- */

#cameraInfo {
  position: fixed;
  top: 56px;
  right: 8px;
  background: rgba(35, 43, 54, 0.9);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 11px;
  color: var(--text-dim);
  z-index: 15;
  pointer-events: none;
  font-family: monospace;
}

/* ---------- scale bar ---------- */

#scaleBar {
  position: fixed;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  z-index: 100;
  pointer-events: none;
  border: 2px solid #ffffff;
  border-bottom: none;
  background: rgba(35, 43, 54, 0.95);
  border-radius: 4px 4px 0 0;
}

.scale-segment {
  height: 10px;
  border-right: 1px solid var(--text-dim);
  box-sizing: border-box;
}

.scale-segment:nth-child(odd) {
  background: rgba(255, 255, 255, 0.25);
}

.scale-segment:nth-child(even) {
  background: rgba(255, 255, 255, 0.1);
}

.scale-segment:last-child {
  border-right: none;
}

#scaleBarLabel {
  position: absolute;
  bottom: -20px;
  right: 0;
  font-size: 12px;
  font-weight: 600;
  color: #ffffff;
  white-space: nowrap;
}

/* ---------- add object row (stacked to avoid scrollbar) ---------- */

.add-object-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.add-object-row select,
.add-object-row button {
  width: 100%;
}

/* ---------- hint + toast ---------- */

#hint {
  position: fixed;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(35, 43, 54, 0.85);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 12px;
  color: var(--text-dim);
  z-index: 10;
  white-space: nowrap;
  max-width: 94vw;
  overflow: hidden;
  text-overflow: ellipsis;
}

#toast {
  position: fixed;
  top: 58px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-dark);
  color: #fff;
  border-radius: 8px;
  padding: 8px 18px;
  z-index: 50;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* ---------- small screens ---------- */

@media (max-width: 700px) {
  #panel {
    top: auto;
    bottom: 44px;
    left: 8px;
    right: 8px;
    width: auto;
    max-height: 40vh;
  }
  #title { display: none; }
  #hint { display: none; }
  button, select { padding: 6px 8px; }
}