:root {
  --bg: #0d1117;
  --panel: #141a22;
  --line: #232c38;
  --text: #dfe6ef;
  --muted: #8a97a8;
  --ok: #4ea8ff;
  --err: #ff5f56;
  --warn: #d9a441;
  --duct: rgba(78, 168, 255, 0.16);
  --jacket: rgba(139, 160, 189, 0.14);
  --guide: #3a4a5e;
}

* { box-sizing: border-box; }

/* Feature-flagged elements set [hidden]; beat the display rules below. */
[hidden] { display: none !important; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 13px/1.5 ui-sans-serif, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body {
  display: grid;
  grid-template-columns: 340px 1fr;
  /* Without a bounded row, a WebGL canvas sizes the stage that sizes the canvas. */
  grid-template-rows: minmax(0, 1fr);
  overflow: hidden;
}

/* ---------- panel ---------- */

.panel {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--panel);
  border-right: 1px solid var(--line);
}

.panel-head { padding: 16px 16px 10px; }
.panel-head h1 { margin: 0 0 6px; font-size: 15px; letter-spacing: .2px; }
.hint { margin: 0; color: var(--muted); font-size: 11.5px; }
.hint a { color: var(--ok); }
.hint strong { color: var(--text); font-weight: 600; }

.controls {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* Sliders are set once and left alone, so they collapse to give the point table the room. */
.acc { margin-bottom: 10px; }
.acc-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 0;
  color: var(--muted);
  font-size: 11.5px;
  cursor: pointer;
  user-select: none;
  list-style: none;
}
.acc-head::-webkit-details-marker { display: none; }
.acc-head:hover { color: var(--text); }
.acc-chev { display: inline-block; font-size: 9px; transition: transform .12s ease; }
.acc[open] .acc-chev { transform: rotate(90deg); }
.acc-digest {
  margin-left: auto;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.acc-body { padding-top: 10px; }

.ctl { display: block; margin-bottom: 12px; }
.ctl > span {
  display: flex;
  justify-content: space-between;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 11.5px;
}
.ctl em { color: var(--text); font-style: normal; font-variant-numeric: tabular-nums; }
.ctl input[type="range"] { width: 100%; accent-color: var(--ok); }
.ctl-note { margin: 4px 0 0; color: #6b7889; font-size: 10.5px; line-height: 1.4; }
.ctl-note--warn { color: #d9a441; }

.toggles { display: flex; gap: 14px; color: var(--muted); font-size: 11.5px; }
.toggles label { display: flex; align-items: center; gap: 5px; cursor: pointer; }
.toggles input { accent-color: var(--ok); }

.summary {
  margin: 0;
  padding: 10px 16px;
  color: var(--muted);
  font-size: 11.5px;
  border-bottom: 1px solid var(--line);
}
.summary--bad { color: var(--err); }
.summary--warn { color: var(--warn); }

.notice {
  margin: 0;
  padding: 9px 16px;
  background: rgba(217, 164, 65, .1);
  border-bottom: 1px solid var(--line);
  border-left: 2px solid var(--warn);
  color: var(--warn);
  font-size: 11px;
  line-height: 1.45;
}

.btn--wide { flex: 1 0 100%; }

body.is-disabled { display: block; overflow: auto; }

.disabled-card {
  max-width: 420px;
  margin: 18vh auto;
  padding: 22px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  text-align: center;
}
.disabled-card h1 { margin: 0 0 10px; font-size: 15px; }
.disabled-card p { margin: 8px 0; color: var(--muted); font-size: 12px; }
.disabled-card code { color: var(--text); background: #0f151d; padding: 1px 5px; border-radius: 4px; }
.disabled-card a { color: var(--ok); }

/* ---------- table ---------- */

.table-wrap { flex: 1; min-height: 0; overflow: auto; }

.pts { width: 100%; border-collapse: collapse; }
.pts th {
  position: sticky;
  top: 0;
  padding: 7px 8px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 10.5px;
  font-weight: 500;
  text-align: left;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.pts td { padding: 3px 8px; border-bottom: 1px solid #1b222c; }
.pts .idx { color: var(--muted); font-variant-numeric: tabular-nums; }
.pts .empty { padding: 20px 8px; color: var(--muted); text-align: center; }
.row--selected { background: #1b2531; }

.num {
  width: 62px;
  padding: 3px 5px;
  background: #0f151d;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--text);
  font: inherit;
  font-variant-numeric: tabular-nums;
}
.num:focus { outline: 1px solid var(--ok); border-color: var(--ok); }
.num--sm { width: 52px; }

/* Three.js owns this element's contents; it just needs to fill the stage. */
.viewport { position: relative; flex: 1; min-width: 0; min-height: 0; }
/* Absolute so the canvas can never feed its own size back into the layout. */
.viewport canvas { display: block; position: absolute; inset: 0; width: 100%; height: 100%; }

.status { white-space: nowrap; }
.tag {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 20px;
  font-size: 10.5px;
}
.tag--ok { background: rgba(78,168,255,.16); color: var(--ok); }
.tag--err { background: rgba(255,95,86,.16); color: var(--err); }
.tag--warn { background: rgba(217,164,65,.16); color: var(--warn); }
.tag--start { background: #202a36; color: var(--muted); }

.actions { white-space: nowrap; text-align: right; }

.mini {
  padding: 2px 6px;
  margin-left: 3px;
  background: #1c2431;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
}
.mini:hover { color: var(--text); border-color: #3a4756; }
.mini--danger:hover { color: var(--err); border-color: var(--err); }

.panel-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
}
.btn {
  flex: 1 1 auto;
  padding: 6px 10px;
  background: #1c2431;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--text);
  font: inherit;
  cursor: pointer;
}
.btn:hover { border-color: var(--ok); }

/* ---------- stage ---------- */

.stage { position: relative; display: flex; min-width: 0; min-height: 0; overflow: hidden; }
#canvas { width: 100%; height: 100%; cursor: grab; touch-action: none; }
#canvas.panning { cursor: grabbing; }

.stage-hint {
  position: absolute;
  left: 14px;
  bottom: 10px;
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  pointer-events: none;
}

/* ---------- svg layers ---------- */

.duct {
  fill: none;
  stroke: var(--duct);
  /* Flat ends, like a cut cylinder. Joints are smooth because each run is a single path. */
  stroke-linecap: butt;
  stroke-linejoin: round;
}

.jacket {
  fill: none;
  stroke: var(--jacket);
  stroke-linecap: butt;
  stroke-linejoin: round;
}

.seg { fill: none; stroke-width: 2.5; }
.seg--ok { stroke: var(--ok); }
.seg--error { stroke: var(--err); stroke-dasharray: 7 6; stroke-width: 2; }
.seg--tight { stroke: var(--warn); }

.guide { stroke: var(--guide); stroke-width: 1; stroke-dasharray: 3 5; }
/* The stretch too close to bend a band of the current width. */
.guide--blocked { stroke: rgba(217,164,65,.5); stroke-dasharray: 2 4; }
.guide-tangent { stroke: #5d708a; stroke-width: 1.5; }
.guide-label { fill: var(--guide); font-size: 10px; text-anchor: middle; }

.err-marker circle { fill: var(--err); }
.err-marker text { fill: #fff; font-size: 14px; font-weight: 700; text-anchor: middle; }

.tight-marker circle { fill: var(--warn); }
.tight-marker text { fill: #1a1205; font-size: 13px; font-weight: 700; text-anchor: middle; }

.pt-hit { fill: transparent; cursor: grab; }
.pt-dot { fill: var(--bg); stroke: var(--ok); stroke-width: 2.5; pointer-events: none; }
.pt--selected .pt-dot { fill: var(--ok); }
.pt-label { fill: var(--muted); font-size: 11px; pointer-events: none; }
.dragging .pt-hit { cursor: grabbing; }