:root {
  color-scheme: dark;
  --bg: #0b0d11;
  --panel: #14171d;
  --panel-2: #1b1f27;
  --border: #262b34;
  --text: #e6e9ef;
  --muted: #8b93a1;
  --accent: #4c8dff;
  --accent-2: #2f6fe0;
  --danger: #ff5c5c;
  --good: #6ee7a8;
  --warn: #ffcf6e;
  --overlay: rgba(0, 0, 0, 0.55);
  --stage: #111318; /* default viewer background; keep lowercase 6-digit hex */
  --radius: 10px;
}

/* Light theme: follows the OS unless the user forced dark, or forced light. */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: #f4f5f7;
    --panel: #ffffff;
    --panel-2: #eef0f3;
    --border: #d9dde3;
    --text: #1b1f27;
    --muted: #5f6875;
    --accent: #2f6fe0;
    --accent-2: #2459bd;
    --danger: #d93636;
    --good: #148a52;
    --warn: #a86b00;
    --overlay: rgba(255, 255, 255, 0.85);
    --stage: #e9ecf0;
  }
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f5f7;
  --panel: #ffffff;
  --panel-2: #eef0f3;
  --border: #d9dde3;
  --text: #1b1f27;
  --muted: #5f6875;
  --accent: #2f6fe0;
  --accent-2: #2459bd;
  --danger: #d93636;
  --good: #148a52;
  --warn: #a86b00;
  --overlay: rgba(255, 255, 255, 0.85);
  --stage: #e9ecf0;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  font-size: 14px;
}

/* Top bar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.logo { font-size: 20px; color: var(--accent); }
.topbar-actions { display: flex; gap: 8px; }

/* Layout */
.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  height: calc(100% - 53px);
}

/* Sidebar */
.sidebar {
  overflow-y: auto;
  padding: 14px;
  background: var(--bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}
.panel h2 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
}
.badge {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 8px;
  font-size: 11px;
  color: var(--text);
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
  transition: border-color .15s, background .15s;
}
.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(76, 141, 255, 0.08);
}
.dz-icon { font-size: 26px; color: var(--accent); }
.dz-inner p { margin: 6px 0; }
.hint { font-size: 12px; color: var(--muted); margin-top: 10px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }

/* Buttons */
.btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: background .15s;
}
.btn:hover { background: var(--accent-2); }
.btn.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn.ghost:hover { background: var(--panel-2); }
.btn.danger-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--danger);
}
.btn.danger-ghost:hover { background: rgba(255, 92, 92, 0.1); }

/* Frame list */
.frame-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; max-height: 260px; overflow-y: auto; }
.frame-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px;
  cursor: grab;
}
.frame-item.dragging { opacity: .5; }
.frame-item img { width: 44px; height: 44px; object-fit: cover; border-radius: 6px; background: #000; }
.frame-item .fname { flex: 1; font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.frame-item .fdel { background: transparent; border: none; color: var(--muted); cursor: pointer; font-size: 16px; }
.frame-item .fdel:hover { color: var(--danger); }

/* Rows */
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 0;
}
.row select, .row input[type="color"] {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 4px;
}
.help { margin: 0; padding-left: 18px; color: var(--muted); font-size: 12px; line-height: 1.6; }

/* Stage */
.stage-wrap { display: flex; flex-direction: column; min-width: 0; }
.stage {
  position: relative;
  flex: 1;
  overflow: hidden;
  background: var(--stage);
}
#viewer { display: block; width: 100%; height: 100%; touch-action: none; cursor: grab; }
#viewer.grabbing { cursor: grabbing; }

.empty-state {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px; color: var(--muted); text-align: center; pointer-events: none;
}
.empty-icon { font-size: 54px; color: var(--border); }
.empty-state h3 { margin: 6px 0 0; color: var(--text); }

.spin-hint {
  position: absolute; bottom: 16px; left: 50%; transform: translateX(-50%);
  background: var(--overlay); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 999px; font-size: 12px; color: var(--text);
  pointer-events: none; animation: fade 2.5s ease forwards;
}
@keyframes fade { 0%,60% { opacity: 1; } 100% { opacity: 0; } }
.hidden { display: none !important; }

/* Stage controls */
.stage-controls {
  padding: 10px 16px;
  background: var(--panel);
  border-top: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 6px;
}
.scrubber { width: 100%; }
.stage-status { display: flex; justify-content: space-between; color: var(--muted); font-size: 12px; }

/* ---------- Mode switch ---------- */
.mode-switch {
  display: inline-flex;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
  gap: 3px;
}
.mode-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 6px 16px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: background .15s, color .15s;
}
.mode-btn:hover { color: var(--text); }
.mode-btn.active {
  background: var(--accent);
  color: #fff;
}

/* ---------- 3D canvas & extras ---------- */
#viewer3d {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}
.loading {
  position: absolute; top: 16px; left: 50%; transform: translateX(-50%);
  background: var(--overlay); border: 1px solid var(--border);
  padding: 6px 14px; border-radius: 999px; font-size: 12px; color: var(--text);
}
.dropzone.compact { padding: 10px; }
.btn.full { width: 100%; margin-top: 8px; }

/* Mode visibility helpers are toggled by JS adding/removing .hidden */

/* ---------- Model info readout ---------- */
.info-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  margin: 0;
  font-size: 12px;
}
.info-grid dt { color: var(--muted); }
.info-grid dd { margin: 0; color: var(--text); word-break: break-word; }
.info-grid dd.good { color: var(--good); }
.info-grid dd.warn { color: var(--warn); }