:root {
  color-scheme: dark;
  --bg: #16181d;
  --bg-raised: #1d2027;
  --bg-panel: #21252d;
  --border: #31363f;
  --text: #d5d9e0;
  --text-dim: #8b929e;
  --accent: #5aa2f7;
  --ok: #4ec98a;
  --error: #f0675a;
  --busy: #e0b14f;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  font-size: 13px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
}

#app {
  display: grid;
  grid-template-rows: auto 1fr minmax(160px, 32vh);
  grid-template-columns: 260px 1fr;
  grid-template-areas:
    "toolbar toolbar"
    "sidebar preview"
    "bottom bottom";
  height: 100vh;
}

/* toolbar */
#toolbar {
  grid-area: toolbar;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--bg-raised);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
#toolbar .spacer { flex: 1; }
#toolbar label { color: var(--text-dim); font-size: 12px; }

select, button {
  background: var(--bg-panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  font: inherit;
}
select { max-width: 240px; }
button { cursor: pointer; }
button:hover { border-color: var(--accent); }
button[data-on="true"] { border-color: var(--ok); color: var(--ok); }
button[data-on="false"] { border-color: var(--text-dim); color: var(--text-dim); }

.status-chip {
  padding: 2px 8px;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 12px;
}
.status-chip[data-state="ok"] { color: var(--ok); border-color: var(--ok); }
.status-chip[data-state="error"] { color: var(--error); border-color: var(--error); }
.status-chip[data-state="busy"] { color: var(--busy); border-color: var(--busy); }

#status-text[data-tone="ok"] { color: var(--ok); }
#status-text[data-tone="error"] { color: var(--error); }
#status-text[data-tone="busy"] { color: var(--busy); }
#reload-time { color: var(--text-dim); font-size: 12px; }

/* sidebar */
#sidebar {
  grid-area: sidebar;
  background: var(--bg-raised);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 8px 0;
}
.tree-dir {
  padding: 6px 12px 2px;
  color: var(--text-dim);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.tree-item {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  border-radius: 0;
  background: transparent;
  padding: 4px 12px 4px 24px;
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 12px;
}
.tree-item::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 8px;
  background: var(--text-dim);
}
.tree-item[data-status="valid"]::before { background: var(--ok); }
.tree-item[data-status="invalid"]::before { background: var(--error); }
.tree-item[data-status="compiling"]::before { background: var(--busy); }
.tree-item[data-stage="vertex"] { color: #9ecbff; }
.tree-item[data-stage="fragment"] { color: #d8a7f0; }
.tree-item[data-stage="compute"] { color: #93d3a2; }
.tree-item[data-selected="true"] { background: #2a3140; }
.tree-item:hover { background: #262b35; }
.tree-empty { padding: 16px 12px; color: var(--text-dim); }

/* preview */
#preview {
  grid-area: preview;
  position: relative;
  display: flex;
  min-height: 0;
  background: #0c0e11;
}
#preview-canvas { width: 100%; height: 100%; display: block; }
#preview-fatal {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  text-align: center;
  color: var(--error);
  background: rgba(12, 14, 17, 0.9);
  font-size: 14px;
}

/* bottom panel */
#bottom {
  grid-area: bottom;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
  background: var(--bg-raised);
  min-height: 0;
}
#tabs {
  display: flex;
  gap: 2px;
  padding: 4px 8px 0;
  border-bottom: 1px solid var(--border);
}
#tabs button {
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 4px 4px 0 0;
  background: transparent;
  color: var(--text-dim);
  padding: 4px 10px;
}
#tabs button[data-active="true"] {
  color: var(--text);
  border-bottom-color: var(--accent);
  background: var(--bg-panel);
}
#code-panel { flex: 1; min-height: 0; display: flex; }

.codeview {
  display: flex;
  flex: 1;
  min-height: 0;
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 12px;
  line-height: 1.5;
}
.codeview-gutter {
  margin: 0;
  padding: 8px 8px 8px 12px;
  text-align: right;
  color: #4b5260;
  background: var(--bg-raised);
  overflow: hidden;
  user-select: none;
}
.codeview-scroll { flex: 1; overflow: auto; }
.codeview-code { margin: 0; padding: 8px 12px; white-space: pre; }

.tok-comment { color: #5f6b7a; font-style: italic; }
.tok-directive { color: #c586c0; }
.tok-attribute { color: #dcdcaa; }
.tok-number { color: #b5cea8; }
.tok-keyword { color: #569cd6; }
.tok-type { color: #4ec9b0; }