:root {
  --bg: #16181c;
  --panel: #1d2026;
  --panel-2: #23272e;
  --line: #31363f;
  --text: #dfe3e8;
  --dim: #8b93a1;
  --accent: #6aa8dd;
  --warn: #e0a75e;
  --err: #e07a7a;
  --ok: #7fbf7f;
  font-synthesis: none;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; height: 100%;
  background: var(--bg); color: var(--text);
  font: 13px/1.45 ui-sans-serif, -apple-system, "SF Pro Text", system-ui, sans-serif;
  overflow: hidden;
}

body { display: flex; }

/* ---------------------------------------------------------------- sidebar */
#sidebar {
  width: 320px; flex: 0 0 320px; height: 100%;
  background: var(--panel); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; overflow-y: auto; overscroll-behavior: contain;
}

#sidebar header {
  padding: 14px 16px 12px; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: var(--panel); z-index: 5;
}

h1 {
  margin: 0 0 8px; font-size: 12px; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase; color: var(--dim);
}

h2 {
  margin: 0; padding: 11px 16px 7px;
  font-size: 10px; font-weight: 600; letter-spacing: .13em;
  text-transform: uppercase; color: var(--dim);
  display: flex; justify-content: space-between; align-items: center;
}

.panel { border-bottom: 1px solid var(--line); padding-bottom: 12px; }

select, input[type="text"], input[type="number"] {
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--line); border-radius: 5px;
  padding: 5px 7px; font: inherit; font-size: 12px; width: 100%;
}
select:focus-visible, input:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}

button {
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--line); border-radius: 5px;
  padding: 5px 10px; font: inherit; font-size: 12px; cursor: pointer;
}
button:hover { background: #2b3038; }
button.active { background: var(--accent); border-color: var(--accent); color: #10151b; font-weight: 600; }

.segmented { display: flex; gap: 6px; padding: 12px 16px 0; }
.segmented button { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#mode-block { border-bottom: 1px solid var(--line); padding-bottom: 10px; }
.mode-help { margin: 7px 16px 0; font-size: 11px; color: var(--dim); line-height: 1.4; }

/* ------------------------------------------------------------------ parts */
#parts-list { list-style: none; margin: 0; padding: 0 8px; }

#parts-list li {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 8px; border-radius: 5px; cursor: pointer;
}
#parts-list li:hover { background: var(--panel-2); }
#parts-list li.off { opacity: .38; }

.swatch { width: 11px; height: 11px; border-radius: 3px; flex: 0 0 auto; box-shadow: inset 0 0 0 1px rgba(0,0,0,.4); }
.part-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.part-meta { color: var(--dim); font-size: 11px; font-variant-numeric: tabular-nums; }

/* ----------------------------------------------------------------- params */
.group { border-top: 1px solid var(--line); }
.group:first-child { border-top: 0; }
.group > h3 {
  margin: 0; padding: 9px 16px; font-size: 11px; font-weight: 600; color: var(--dim);
  cursor: pointer; display: flex; justify-content: space-between; user-select: none;
}
.group > h3:hover { color: var(--text); }
.group.collapsed .group-body { display: none; }
.group-body { padding: 0 16px 10px; }

.param { margin-bottom: 11px; }
.param-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; margin-bottom: 3px; }
.param-name { font-size: 12px; color: var(--text); }
.param-value {
  font-size: 11px; color: var(--accent); font-variant-numeric: tabular-nums;
  background: transparent; border: 0; text-align: right; width: 74px; padding: 0;
}
.param-desc { font-size: 11px; color: var(--dim); margin: 0 0 4px; line-height: 1.35; }

input[type="range"] { width: 100%; accent-color: var(--accent); margin: 0; }

.param.bool .param-head { margin: 0; }
input[type="checkbox"] { accent-color: var(--accent); }

/* ----------------------------------------------------------------- export */
#export-panel .row { display: flex; align-items: center; gap: 8px; padding: 3px 16px 7px; }
#export-panel .row span { flex: 0 0 84px; color: var(--dim); font-size: 11px; }
#export-buttons { display: flex; flex-wrap: wrap; gap: 6px; padding: 6px 16px 0; }
#export-buttons button { font-size: 11px; padding: 4px 8px; }

#build-info {
  padding: 12px 16px 20px; color: var(--dim); font-size: 11px; line-height: 1.5;
  margin-top: auto;
}

/* -------------------------------------------------------------------- main */
main { flex: 1; position: relative; min-width: 0; }
#canvas-wrap { position: absolute; inset: 0; }
canvas { display: block; }

#toolbar { position: absolute; top: 12px; left: 12px; display: flex; gap: 10px; }
.views { display: flex; gap: 4px; background: rgba(22,24,28,.82); padding: 4px; border-radius: 7px; border: 1px solid var(--line); backdrop-filter: blur(6px); }

#status {
  position: absolute; top: 14px; right: 14px;
  display: flex; align-items: center; gap: 7px;
  background: rgba(22,24,28,.82); border: 1px solid var(--line); backdrop-filter: blur(6px);
  padding: 5px 11px; border-radius: 7px; color: var(--dim); font-size: 11px;
}
#status .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); flex: 0 0 auto; }
#status.busy .dot { background: var(--warn); animation: pulse 1s ease-in-out infinite; }
#status.error .dot { background: var(--err); }
#status.error { color: var(--err); }
@keyframes pulse { 50% { opacity: .25; } }

#readout {
  position: absolute; left: 12px; bottom: 12px;
  background: rgba(22,24,28,.82); border: 1px solid var(--line); backdrop-filter: blur(6px);
  padding: 7px 11px; border-radius: 7px; color: var(--dim);
  font-size: 11px; font-variant-numeric: tabular-nums; white-space: pre;
}

#console {
  position: absolute; right: 12px; bottom: 12px; width: 430px; max-width: 46vw;
  background: rgba(22,24,28,.9); border: 1px solid var(--line); border-radius: 8px;
  backdrop-filter: blur(6px); overflow: hidden;
}
#console h2 { padding: 8px 12px 6px; }
#console h2 button { padding: 1px 7px; font-size: 10px; }
#console-body {
  margin: 0; padding: 0 12px 11px; max-height: 30vh; overflow: auto;
  font: 11px/1.55 ui-monospace, "SF Mono", Menlo, monospace; color: var(--text);
  white-space: pre-wrap; word-break: break-word;
}
#console.collapsed #console-body { display: none; }
#console-body .warn { color: var(--warn); }
#console-body .err { color: var(--err); }
#console-body .hi { color: var(--accent); }