:root {
  --builder-accent: #ffb342;
  --builder-cyan: #6ce9ff;
  --builder-dark: #081017;
}

.builder-shell,
body {
  overflow: auto;
}

.builder-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(300px, 370px) minmax(0, 1fr);
  background:
    radial-gradient(circle at 65% 15%, rgba(76, 194, 255, 0.12), transparent 31%),
    linear-gradient(125deg, #0e1924, #060b10 70%);
}

.builder-sidebar {
  padding: 26px;
  background: rgba(5, 10, 15, 0.88);
  border-right: 1px solid rgba(255, 255, 255, 0.09);
}

.builder-back {
  display: inline-block;
  margin-bottom: 28px;
  color: #d8edff;
  text-decoration: none;
}

.builder-kicker {
  margin: 0 0 6px;
  color: var(--builder-cyan);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.15em;
}

.builder-sidebar h1,
.builder-workspace h2,
.builder-section h2 {
  margin: 0;
}

.builder-sidebar h1 {
  font-size: clamp(1.7rem, 4vw, 2.25rem);
  line-height: 1.05;
}

.builder-copy,
.builder-howto p,
.builder-summary small {
  color: var(--muted);
  line-height: 1.45;
}

.builder-copy {
  margin: 14px 0 26px;
}

.builder-section {
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.builder-section-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

#builder-rotation {
  padding: 5px 9px;
  border: 1px solid rgba(108, 233, 255, 0.28);
  border-radius: 999px;
  color: var(--builder-cyan);
  font-size: 0.8rem;
  font-weight: 700;
}

.builder-parts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.builder-part {
  min-height: 64px;
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 8px;
  align-items: center;
  padding: 8px;
  text-align: left;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.045);
}

.builder-part:hover,
.builder-part.is-active {
  border-color: rgba(255, 179, 66, 0.78);
  background: rgba(255, 179, 66, 0.14);
}

.builder-part.is-active {
  box-shadow: inset 0 0 0 1px rgba(255, 179, 66, 0.28);
}

.part-icon {
  height: 26px;
  border: 2px solid rgba(255, 255, 255, 0.76);
  border-radius: 4px;
  background: var(--part-color);
}

.part-icon.wide { height: 15px; }
.part-icon.tall { width: 15px; justify-self: center; }
.part-icon.wedge { clip-path: polygon(0 100%, 100% 100%, 100% 0); }

.builder-part strong,
.builder-part small {
  display: block;
}

.builder-part strong { font-size: 0.86rem; }
.builder-part small { margin-top: 2px; color: var(--muted); font-size: 0.7rem; }

.builder-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.compact-actions { margin-top: 13px; }

.builder-actions button {
  padding: 10px 13px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
}

.builder-actions button:hover,
.builder-actions button.is-active {
  background: rgba(255, 255, 255, 0.14);
}

.builder-actions .primary {
  border-color: rgba(255, 179, 66, 0.7);
  background: linear-gradient(135deg, #f0952d, #ffbf53);
  color: #15100a;
  font-weight: 800;
}

.builder-summary {
  display: grid;
  gap: 5px;
  padding: 15px;
  border: 1px solid rgba(108, 233, 255, 0.22);
  border-radius: 14px;
  background: rgba(108, 233, 255, 0.06);
}

.builder-summary > span { color: var(--builder-cyan); font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; }
.builder-summary strong { font-size: 1.1rem; }

.builder-workspace {
  min-width: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  padding: clamp(20px, 4vw, 44px);
}

.builder-workspace-header {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 18px;
}

.builder-legend {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.8rem;
}

.builder-legend span { display: inline-flex; gap: 6px; align-items: center; }
.builder-legend i { width: 12px; height: 12px; border-radius: 3px; }
.legend-built { background: var(--builder-accent); }
.legend-mirror { background: rgba(108, 233, 255, 0.25); border: 1px solid rgba(108, 233, 255, 0.65); }

.builder-canvas-wrap {
  position: relative;
  min-height: 480px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid rgba(172, 222, 255, 0.17);
  border-radius: 22px;
  background:
    radial-gradient(circle at 50% 50%, rgba(42, 78, 102, 0.3), transparent 62%),
    #071018;
  box-shadow: 0 20px 55px rgba(0, 0, 0, 0.26);
}

#builder-canvas {
  width: min(100%, 960px);
  height: auto;
  max-height: calc(100vh - 130px);
  cursor: grab;
  touch-action: none;
}

#builder-canvas:active { cursor: grabbing; }

.builder-tooltip {
  position: absolute;
  display: none;
  max-width: 210px;
  padding: 7px 9px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  background: rgba(4, 9, 13, 0.92);
  color: #fff;
  font-size: 0.78rem;
  pointer-events: none;
}

@media (max-width: 800px) {
  .builder-shell { grid-template-columns: 1fr; }
  .builder-sidebar { border-right: 0; border-bottom: 1px solid rgba(255, 255, 255, 0.09); }
  .builder-workspace { min-height: 690px; padding: 20px 14px; }
  .builder-workspace-header { align-items: start; flex-direction: column; }
  #builder-canvas { max-height: none; }
}