/* ── Reset & tokens ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #111114;
  --surface:      #1a1a1f;
  --surface2:     #222228;
  --border:       #2e2e38;
  --accent:       #7c6aff;
  --accent-hover: #9b8dff;
  --text:         #e0e0e8;
  --text-muted:   #888899;
  --danger:       #ff5f5f;
  --success:      #4ade80;
  --radius:       8px;
  --sidebar-w:    380px;
  --header-h:     48px;
}

html, body {
  height: 100%;
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}

/* ── Header ─────────────────────────────────────────────────────────── */
header {
  height: var(--header-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  position: relative;
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.02em;
}

.header-note {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
}

/* ── Main layout ─────────────────────────────────────────────────────── */
main {
  display: flex;
  height: calc(100vh - var(--header-h));
  overflow: hidden;
}

/* ── 3-D Viewport section ────────────────────────────────────────────── */
#viewport-section {
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.drop-zone {
  flex: 1 1 0;
  position: relative;
  overflow: hidden;
}

.drop-zone.drag-over::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px dashed var(--accent);
  border-radius: var(--radius);
  pointer-events: none;
  background: rgba(124, 106, 255, 0.06);
}

.drop-hint {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.6;
  pointer-events: none;
  transition: opacity 0.2s;
}

.drop-hint.hidden { opacity: 0; pointer-events: none; }

.link-label {
  color: var(--accent);
  cursor: pointer;
  pointer-events: all;
  text-decoration: underline;
}

#viewport {
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
}

#viewport-footer {
  height: 28px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 16px;
  flex-shrink: 0;
}

.mesh-info {
  font-size: 11px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.viewport-controls-hint {
  margin-left: auto;
  font-size: 11px;
  color: #555566;
}

.wireframe-toggle {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

/* ── Settings panel ──────────────────────────────────────────────────── */
#settings-panel {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--surface);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

#settings-panel::-webkit-scrollbar { width: 5px; }
#settings-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.panel-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.panel-section h2 {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* ── Preset grid ─────────────────────────────────────────────────────── */
.preset-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 10px;
}

.preset-swatch {
  aspect-ratio: 1;
  border-radius: 5px;
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color 0.15s, transform 0.1s;
  position: relative;
}

.preset-swatch:hover { border-color: var(--text-muted); transform: scale(1.04); }
.preset-swatch.active { border-color: var(--accent); }

.preset-swatch canvas {
  width: 100%;
  height: 100%;
  display: block;
  image-rendering: pixelated;
}

.preset-swatch .preset-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0,0,0,0.6);
  color: #fff;
  font-size: 9px;
  text-align: center;
  padding: 2px 0;
  opacity: 0;
  transition: opacity 0.15s;
}

.preset-swatch:hover .preset-label { opacity: 1; }

/* ── Custom upload button ─────────────────────────────────────────────── */
.upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  font-size: 12px;
  transition: background 0.15s, border-color 0.15s;
}

.upload-btn:hover {
  background: var(--border);
  border-color: var(--accent);
}

.active-map-name {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-muted);
  word-break: break-all;
}

/* ── Form rows ───────────────────────────────────────────────────────── */
.form-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.form-row:last-child { margin-bottom: 0; }

.form-row label {
  flex: 0 0 80px;
  font-size: 12px;
  color: var(--text);
  white-space: nowrap;
}

.form-row select {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 5px 8px;
  font-size: 12px;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23888'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  cursor: pointer;
}

.form-row select:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Sliders ─────────────────────────────────────────────────────────── */
.slider-row { align-items: center; }

.slider-row input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  cursor: pointer;
  outline: none;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: grab;
  transition: background 0.15s;
}

.slider-row input[type="range"]::-webkit-slider-thumb:active { cursor: grabbing; background: var(--accent-hover); }
.slider-row input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: none; cursor: grab;
}

.val {
  flex: 0 0 52px;
  text-align: right;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
}
input[type="number"].val {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 2px 6px;
  cursor: text;
  box-sizing: border-box;
  min-width: 0;
  -moz-appearance: textfield;
}
input[type="number"].val::-webkit-inner-spin-button,
input[type="number"].val::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"].val:focus { outline: none; border-color: var(--accent); }

/* ── Hint text ───────────────────────────────────────────────────────── */
.hint {
  font-size: 10px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 6px;
  margin-bottom: 10px;
}

/* ── Export progress ─────────────────────────────────────────────────── */
.export-progress {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  margin-bottom: 10px;
  font-size: 11px;
  color: var(--text-muted);
}

.export-progress.hidden { display: none; }

.export-progress-bar {
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
  transition: width 0.1s;
  margin-bottom: 6px;
}

/* ── Export button ───────────────────────────────────────────────────── */
.export-btn {
  width: 100%;
  padding: 9px 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

.export-btn:hover:not(:disabled) { background: var(--accent-hover); }
.export-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.export-btn.busy { opacity: 0.7; pointer-events: none; }
/* ── Lock / proportional-scale button ───────────────────────────────────── */
.lock-btn {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.lock-btn.active {
  background: color-mix(in srgb, var(--accent) 18%, var(--surface2));
  border-color: var(--accent);
  color: var(--accent);
}

.lock-btn:hover { border-color: var(--accent-hover); }

/* ── Lock row connector ───────────────────────────────────────────────────────── */
.lock-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 2px 0;
}

.lock-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Triangle limit warning ──────────────────────────────────────────────── */
.tri-limit-warning {
  background: color-mix(in srgb, #f59e0b 15%, var(--surface2));
  border: 1px solid #f59e0b;
  color: #f59e0b;
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 11px;
  line-height: 1.4;
  margin-bottom: 8px;
}

.tri-limit-warning.hidden { display: none; }