:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --panel-2: #f0f1f4;
  --text: #1c1d21;
  --muted: #6b6f78;
  --line: #e2e4e8;
  --accent: #0a6cff;
  --accent-text: #ffffff;
  --highlight: #ff8c26;
  --stage: #16171b;
  --bar: rgba(250, 250, 252, 0.82);
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.25);
  --danger: #c62828;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1b1c20;
    --panel: #222328;
    --panel-2: #2a2b31;
    --text: #ececf0;
    --muted: #9a9ea8;
    --line: #34363d;
    --accent: #3d8bff;
    --bar: rgba(40, 41, 47, 0.82);
    --danger: #ff6b6b;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #1b1c20; --panel: #222328; --panel-2: #2a2b31; --text: #ececf0; --muted: #9a9ea8;
  --line: #34363d; --accent: #3d8bff; --bar: rgba(40, 41, 47, 0.82); --danger: #ff6b6b; color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
button, input, textarea { font: inherit; color: inherit; }
h1, h2 { margin: 0; }

/* Top bar */
.topbar {
  display: flex; align-items: center; gap: 8px;
  height: 52px; padding: 0 12px;
  background: var(--panel); border-bottom: 1px solid var(--line);
}
.title { flex: 1; min-width: 0; }
.title h1 { font-size: 15px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.title span { font-size: 12px; color: var(--muted); }
.icon-btn {
  width: 36px; height: 32px; border: 0; border-radius: 8px; background: transparent; cursor: pointer;
  display: inline-grid; place-items: center; color: var(--text);
}
.icon-btn:hover { background: var(--panel-2); }
.icon-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; }
.icon-btn.active { color: var(--accent); }

/* Three columns */
.layout { flex: 1; display: flex; min-height: 0; }
.panel { background: var(--panel); display: flex; flex-direction: column; min-height: 0; }
#sidebar { width: 250px; border-right: 1px solid var(--line); }
#inspector { width: 310px; border-left: 1px solid var(--line); }
#inspector.hidden { display: none; }
.panel-scroll { flex: 1; overflow-y: auto; padding: 8px 12px 12px; }
.panel h2 { font-size: 11px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; margin: 12px 4px 6px; }
.panel-foot { padding: 12px; border-top: 1px solid var(--line); }
.foot-row { display: flex; justify-content: space-between; margin-top: 8px; }
.hint { color: var(--muted); font-size: 12px; margin: 4px 4px 8px; }

.object-list { list-style: none; margin: 0; padding: 0; }
.object-list li {
  padding: 7px 10px; border-radius: 8px; cursor: pointer; position: relative;
}
.object-list li:hover { background: var(--panel-2); }
.object-list li.selected { background: var(--accent); color: var(--accent-text); }
.object-list li.selected .meta { color: inherit; opacity: 0.8; }
.object-list .name { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; padding-right: 20px; }
.object-list .meta { font-size: 12px; color: var(--muted); }
.object-list .remove {
  position: absolute; right: 6px; top: 8px; border: 0; background: none; cursor: pointer;
  color: inherit; opacity: 0; font-size: 15px; line-height: 1;
}
.object-list li:hover .remove, .object-list li:focus-within .remove { opacity: 0.7; }

#generation { padding: 8px 10px; border-radius: 8px; background: var(--panel-2); margin-bottom: 6px; }
#generation .row { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); margin-top: 4px; }
#generation .error { color: var(--danger); font-size: 12px; margin-top: 4px; }
.spinner { width: 12px; height: 12px; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

button:where(:not(.icon-btn):not(.link):not(.remove)) {
  border: 1px solid var(--line); background: var(--panel-2); border-radius: 8px; padding: 6px 12px; cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
button.primary:disabled { opacity: 0.45; cursor: default; }
button.wide { width: 100%; padding: 9px; }
button.link { border: 0; background: none; color: var(--muted); cursor: pointer; padding: 0; font-size: 12px; }
button.link:hover { color: var(--text); text-decoration: underline; }
.notice button.link { font-size: inherit; color: var(--accent); }

/* Stage */
#stage { flex: 1; position: relative; min-width: 0; background: var(--stage); }
#viewport { position: absolute; inset: 0; }
#viewport canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.controlbar {
  position: absolute; left: 50%; bottom: 16px; transform: translateX(-50%);
  display: flex; align-items: center; gap: 12px;
  padding: 8px 16px; border-radius: 999px;
  background: var(--bar); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow); width: min(640px, calc(100% - 32px));
}
.controlbar input[type=range] { flex: 1; min-width: 80px; accent-color: var(--accent); }
.controlbar .lbl { font-size: 12px; color: var(--muted); white-space: nowrap; }
.controlbar .check { font-size: 12px; white-space: nowrap; display: flex; gap: 4px; align-items: center; }
.icon-btn.round { background: var(--panel-2); border-radius: 50%; width: 32px; }

/* Inspector */
#about { padding: 14px 14px 4px; border-bottom: 1px solid var(--line); }
#about p { margin: 0 0 8px; }
#about { max-height: 42%; overflow-y: auto; }
#overview h3 { font-size: 13px; margin: 10px 0 6px; }
#overview p { font-size: 13px; }
#part-card { padding: 14px; border-bottom: 1px solid var(--line); max-height: 60%; overflow-y: auto; }
#part-card section { margin-top: 12px; }
#part-card h4 { margin: 0 0 3px; font-size: 13px; }
#part-card section p { margin: 0; font-size: 13px; }
#part-card ul { margin: 0; padding-left: 18px; font-size: 13px; }
#part-card li { margin: 2px 0; }
#part-card .head { display: flex; align-items: baseline; gap: 8px; }
#part-card h3 { margin: 0; font-size: 17px; flex: 1; }
#part-card p { margin: 6px 0 10px; }
#part-card dl { display: grid; grid-template-columns: auto 1fr; gap: 3px 10px; font-size: 12px; margin: 0 0 10px; }
#part-card dt { color: var(--muted); }
#part-card dd { margin: 0; }
#part-search {
  margin: 10px 12px 0; padding: 7px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--panel-2);
}
#parts h2 { margin-top: 14px; }
.part-row {
  display: flex; align-items: center; gap: 8px; padding: 5px 8px; border-radius: 6px; cursor: pointer; user-select: none;
}
.part-row:hover { background: var(--panel-2); }
.part-row.selected { background: var(--accent); color: var(--accent-text); }
.part-row .dot { width: 10px; height: 10px; border-radius: 50%; flex: none; box-shadow: inset 0 0 0 0.5px rgba(128, 128, 128, 0.6); }
.part-row .pname { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.part-row .count { font-size: 12px; opacity: 0.7; }

/* Dialogs */
dialog {
  border: 0; border-radius: 14px; padding: 22px; width: min(520px, calc(100vw - 32px));
  background: var(--panel); color: var(--text); box-shadow: var(--shadow);
}
dialog::backdrop { background: rgba(0, 0, 0, 0.35); }
dialog h2 { font-size: 18px; margin-bottom: 6px; }
dialog input[type=text], dialog input[type=password], dialog textarea {
  width: 100%; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--panel-2); margin: 8px 0;
}
dialog textarea { resize: vertical; }
.field { display: block; font-size: 13px; margin-top: 8px; }
.drop {
  display: grid; place-items: center; min-height: 160px; margin: 6px 0 10px; border: 1.5px dashed var(--line);
  border-radius: 10px; color: var(--muted); cursor: pointer; text-align: center; padding: 10px; position: relative;
}
.drop.over { border-color: var(--accent); color: var(--accent); }
.drop img { max-height: 150px; max-width: 100%; border-radius: 6px; }
.notice { font-size: 13px; background: var(--panel-2); padding: 8px 10px; border-radius: 8px; }
.actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 12px; }
#key-remove { margin-right: auto; }
.noscript { padding: 20px; }

#scrim { position: fixed; inset: 52px 0 0 0; background: rgba(0, 0, 0, 0.35); z-index: 5; }
.only-narrow { display: none; }

/* Phones and narrow windows: side panels become drawers */
@media (max-width: 820px) {
  .only-narrow { display: inline-grid; }
  #sidebar, #inspector {
    position: fixed; top: 52px; bottom: 0; z-index: 6; width: min(86vw, 320px);
    transition: transform 0.22s ease; box-shadow: var(--shadow);
  }
  #sidebar { left: 0; transform: translateX(-105%); }
  #inspector { right: 0; transform: translateX(105%); }
  #inspector.hidden { display: flex; }
  #sidebar.open, #inspector.open { transform: none; }
  .controlbar { gap: 8px; padding: 6px 12px; bottom: calc(12px + env(safe-area-inset-bottom)); }
  .controlbar .lbl { display: none; }
}