:root {
  --canvas: #121516;
  --panel: #191d1e;
  --elevated: #222728;
  --text: #f4f1e8;
  --muted: #9ba2a0;
  --border: #343a3a;
  --accent: #ff7657;
  --accent-hover: #ff9178;
  --success: #86c99a;
  --warning: #f3c969;
  --shadow: rgb(0 0 0 / 22%);
  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s6: 24px;
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; background: var(--canvas); color: var(--text); }
button, input, select { font: inherit; }
button { color: inherit; }

.topbar {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--s3) 0 var(--s4);
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: var(--s2); color: var(--text); text-decoration: none; font-size: 16px; font-weight: 650; }
.brand-mark { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; color: var(--canvas); background: var(--accent); font-size: 18px; }
.brand small, .eyebrow { font: 650 11px/1 ui-monospace, Consolas, monospace; letter-spacing: .08em; color: var(--muted); }
.actions { display: flex; gap: var(--s2); }
.button, .tool, .asset-card { border: 1px solid transparent; cursor: pointer; transition: transform 120ms ease-out, background-color 120ms ease-out, border-color 120ms ease-out; }
.button { min-height: 40px; padding: 0 var(--s4); border-radius: 999px; background: var(--elevated); font-size: 14px; font-weight: 600; }
.button:hover { background: var(--border); }
.button:active, .tool:active, .asset-card:active { transform: translateY(1px); }
.button.primary { color: var(--canvas); background: var(--accent); }
.button.primary:hover { background: var(--accent-hover); }
.button.danger { width: 100%; margin-top: auto; color: var(--accent-hover); border-color: var(--border); background: transparent; }
button:focus-visible, input:focus-visible, select:focus-visible, canvas:focus-visible { outline: 2px dashed var(--accent); outline-offset: 2px; }

.workspace { height: calc(100% - 84px); display: grid; grid-template-columns: 248px minmax(0, 1fr) 260px; }
.panel { min-width: 0; padding: var(--s4); background: var(--panel); overflow-y: auto; }
.library { border-right: 1px solid var(--border); }
.inspector { display: flex; flex-direction: column; gap: var(--s4); border-left: 1px solid var(--border); }
.panel-heading { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: var(--s4); }
.panel-heading h1, .panel-heading h2 { margin: var(--s1) 0 0; font-size: 16px; line-height: 1.3; font-weight: 600; }
.count { min-width: 24px; padding: var(--s1) var(--s2); border-radius: 999px; background: var(--elevated); color: var(--muted); text-align: center; font: 500 12px/1.3 ui-monospace, Consolas, monospace; }

.asset-card { width: 100%; display: flex; align-items: center; gap: var(--s3); padding: var(--s2); border-radius: 8px; background: transparent; text-align: left; }
.asset-card:hover { background: var(--elevated); }
.asset-card.active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.asset-card strong, .asset-card small { display: block; }
.asset-card strong { font-size: 14px; }
.asset-card small { margin-top: var(--s1); color: var(--muted); font-size: 12px; }
.asset-preview { display: grid; place-items: center; flex: 0 0 52px; height: 52px; border-radius: 6px; color: var(--accent); background: var(--elevated); font-size: 28px; }
.hint { display: flex; gap: var(--s2); margin-top: var(--s6); padding-top: var(--s4); border-top: 1px solid var(--border); color: var(--muted); font-size: 12px; line-height: 1.5; }
.hint p { margin: 0; }
.hint-dot { flex: 0 0 7px; height: 7px; margin-top: 5px; border-radius: 50%; background: var(--accent); }

.viewport { position: relative; min-width: 0; overflow: hidden; background: var(--canvas); }
canvas { display: block; width: 100%; height: 100%; touch-action: none; cursor: grab; }
canvas.dragging { cursor: grabbing; }
.viewport-tools { position: absolute; top: var(--s3); left: 50%; display: flex; gap: var(--s1); padding: var(--s1); border: 1px solid var(--border); border-radius: 10px; background: color-mix(in srgb, var(--panel) 92%, transparent); transform: translateX(-50%); box-shadow: 0 8px 24px var(--shadow); backdrop-filter: blur(12px); }
.tool { display: flex; align-items: center; gap: var(--s2); min-height: 36px; padding: 0 var(--s3); border-radius: 7px; background: transparent; color: var(--muted); font-size: 12px; }
.tool:hover { color: var(--text); background: var(--elevated); }
.tool.active { color: var(--text); background: var(--border); }
.axis { position: absolute; right: var(--s4); bottom: var(--s4); width: 48px; height: 48px; color: var(--muted); font: 650 11px/1 ui-monospace, Consolas, monospace; pointer-events: none; }
.axis i { position: absolute; font-style: normal; }
.axis-y { top: 0; left: 21px; color: var(--success); }
.axis-x { right: 0; bottom: 4px; color: var(--accent); }
.axis-z { left: 0; bottom: 4px; color: var(--success); }
.axis::before, .axis::after { content: ""; position: absolute; left: 23px; bottom: 13px; width: 22px; height: 1px; transform-origin: left; background: var(--accent); }
.axis::after { transform: rotate(145deg); background: var(--success); }
.gpu-error { position: absolute; inset: 50% auto auto 50%; display: grid; gap: var(--s2); width: min(420px, calc(100% - 32px)); padding: var(--s6); border: 1px solid var(--border); border-radius: 12px; background: var(--panel); text-align: center; transform: translate(-50%, -50%); }
.gpu-error[hidden] { display: none; }
.gpu-error span { color: var(--muted); font-size: 14px; }
.toast { position: absolute; left: 50%; bottom: var(--s6); padding: var(--s2) var(--s4); border: 1px solid var(--border); border-radius: 999px; background: var(--panel); opacity: 0; transform: translate(-50%, 8px); transition: opacity 220ms ease-in-out, transform 220ms ease-in-out; pointer-events: none; font-size: 12px; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

fieldset { display: grid; gap: var(--s3); margin: 0; padding: var(--s4) 0 0; border: 0; border-top: 1px solid var(--border); }
legend { padding: 0 0 var(--s3); color: var(--muted); font: 650 11px/1 ui-monospace, Consolas, monospace; letter-spacing: .08em; text-transform: uppercase; }
.field { display: grid; gap: var(--s2); color: var(--muted); font-size: 12px; }
.field > span { display: flex; justify-content: space-between; }
.field output { color: var(--text); font-family: ui-monospace, Consolas, monospace; }
.field input[type="number"], .field select { width: 100%; min-height: 36px; padding: 0 var(--s3); border: 1px solid var(--border); border-radius: 7px; color: var(--text); background: var(--elevated); }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.modifier-stack { gap: var(--s1); }
.toggle { display: flex; align-items: center; gap: var(--s2); min-height: 40px; cursor: pointer; color: var(--muted); font-size: 12px; }
.toggle input { position: absolute; opacity: 0; }
.toggle span { position: relative; width: 34px; height: 20px; border-radius: 999px; background: var(--border); }
.toggle span::after { content: ""; position: absolute; top: 3px; left: 3px; width: 14px; height: 14px; border-radius: 50%; background: var(--muted); transition: transform 120ms ease-out, background-color 120ms ease-out; }
.toggle input:checked + span { background: var(--accent); }
.toggle input:checked + span::after { background: var(--canvas); transform: translateX(14px); }
.toggle input:focus-visible + span { outline: 2px dashed var(--accent); outline-offset: 2px; }
.point-fields { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s2); }
.point-empty { color: var(--muted); font-size: 12px; line-height: 1.5; }

.statusbar { height: 28px; display: flex; align-items: center; gap: var(--s6); padding: 0 var(--s3); border-top: 1px solid var(--border); background: var(--panel); color: var(--muted); font: 500 11px/1 ui-monospace, Consolas, monospace; }
.status { display: flex; align-items: center; gap: var(--s2); color: var(--text); }
.status i { width: 7px; height: 7px; border-radius: 50%; background: var(--warning); }
.status.ready i { background: var(--success); }
.fps { margin-left: auto; color: var(--text); font-variant-numeric: tabular-nums; }

@media (max-width: 900px) {
  .workspace { grid-template-columns: minmax(0, 1fr) 220px; }
  .library { display: none; }
}

@media (max-width: 760px) {
  .workspace { display: block; position: relative; }
  .viewport { width: 100%; height: 100%; }
  .inspector { position: absolute; z-index: 2; right: var(--s2); bottom: 36px; width: min(200px, calc(100% - 16px)); max-height: 160px; border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 8px 24px var(--shadow); }
  .inspector .danger { display: none; }
  .panel-heading { margin-bottom: var(--s2); }
  .mobile-hide { display: none; }
  .viewport-tools { left: var(--s2); transform: none; }
  .toast { top: 68px; bottom: auto; }
  .statusbar { gap: var(--s2); justify-content: space-between; }
  .fps { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; }
}