:root {
  --bg: #131417;
  --panel: #1c1e23;
  --line: #2c2f36;
  --text: #e6e8ec;
  --muted: #8b909a;
  --accent: #3b82f6;
  --ok: #22c55e;
  --warn: #f59e0b;
  --err: #ef4444;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 14px/1.45 -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  /* Clear the fixed site header (see site.css .header). */
  padding-top: 70px;
}
.builder-banner {
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
}
.builder-banner h1 { margin: 0; font-size: 17px; font-weight: 600; }
.builder-banner h1 span { color: var(--muted); font-weight: 400; }
.builder-banner .sub { color: var(--muted); font-size: 12px; margin-top: 2px; }
.builder-banner .sub a { color: #a8d4ff; }

.builder-main {
  display: grid;
  grid-template-columns: 280px 1fr 320px;
  gap: 1px;
  background: var(--line);
  /* Viewport minus site header pad + builder banner. */
  height: calc(100vh - 70px - 62px);
  min-height: 420px;
}
.builder-main > section { background: var(--bg); overflow: auto; }

#panel { padding: 16px; }
fieldset {
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 0 0 14px;
  padding: 10px 12px 12px;
}
legend { color: var(--muted); font-size: 12px; padding: 0 4px; }
label { display: block; margin: 8px 0; color: var(--muted); font-size: 12px; }
input, select {
  width: 100%;
  margin-top: 3px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 13px;
}
button {
  width: 100%;
  padding: 10px;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
button:hover { filter: brightness(1.08); }

#stage { position: relative; }
#viewport { position: absolute; inset: 0; }
#stage-toolbar {
  position: absolute;
  left: 12px;
  top: 12px;
  z-index: 3;
  display: flex;
  gap: 6px;
}
#stage-toolbar button {
  width: auto;
  padding: 5px 10px;
  font-size: 11px;
  font-weight: 500;
}
#stage-toolbar button.active { outline: 2px solid #3b82f6; }
.unsaved-indicator {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-size: 11px;
  font-weight: 500;
  color: #fcd34d;
  background: rgba(245, 158, 11, 0.14);
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
}
.unsaved-indicator.is-dirty { display: inline-flex; }
.unsaved-indicator:hover { filter: brightness(1.08); }
.unsaved-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #fbbf24;
  box-shadow: 0 0 6px rgba(251, 191, 36, 0.8);
}
#measure-readout {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 3;
  background: rgba(0,0,0,.72);
  border: 1px solid #3a3f4b;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 12px;
  color: #e6e8ec;
  max-width: min(420px, calc(100% - 24px));
  line-height: 1.45;
}
#measure-readout b { color: #22c55e; font-size: 15px; }

/* Fusion-style view cube (top-right of viewport) */
.view-cube-host {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 4;
  pointer-events: none;
  user-select: none;
}
.view-cube-scene {
  width: 104px;
  height: 104px;
  pointer-events: auto;
  cursor: pointer;
}
.view-cube-gl {
  display: block;
  width: 104px;
  height: 104px;
}
.view-cube-opt {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
  padding: 4px 6px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.45);
  color: var(--muted);
  font-size: 10px;
  pointer-events: auto;
  cursor: pointer;
  white-space: nowrap;
}
.view-cube-opt input {
  width: auto;
  margin: 0;
  cursor: pointer;
}
.view-cube-orient {
  margin-top: 4px;
  padding: 5px 6px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.45);
  pointer-events: auto;
}
.view-cube-orient-label {
  display: block;
  color: var(--muted);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.view-cube-orient-btns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3px;
}
.view-cube-orient-btns button {
  width: auto;
  padding: 4px 0;
  font-size: 10px;
  font-weight: 600;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}
.view-cube-orient-btns button:hover {
  background: rgba(59, 130, 246, 0.35);
}
#status {
  position: absolute;
  left: 50%; top: 16px;
  transform: translateX(-50%);
  background: rgba(0,0,0,.6);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  color: var(--muted);
}
#status.busy::before {
  content: "";
  display: inline-block;
  width: 10px; height: 10px;
  margin-right: 8px;
  border: 2px solid var(--muted);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: -1px;
}
@keyframes spin { to { transform: rotate(360deg); } }

#readout { padding: 16px; }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
}
.stat span { display: block; color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .04em; }
.stat b { font-size: 15px; }
.stat.price b { color: var(--accent); }
.muted { color: var(--muted); font-size: 11px; margin: 8px 2px 0; }
#readout h3 { font-size: 13px; margin: 18px 0 8px; color: var(--muted); }
#dfm { list-style: none; padding: 0; margin: 0; }
#dfm li {
  padding: 8px 10px;
  border-radius: 6px;
  margin-bottom: 6px;
  font-size: 12px;
  border-left: 3px solid var(--line);
  background: var(--panel);
}
#dfm li.ok, #loads li.ok { border-left-color: var(--ok); }
#dfm li.warn, #loads li.warn { border-left-color: var(--warn); }
#dfm li.error, #loads li.error { border-left-color: var(--err); }
#loads { list-style: none; padding: 0; margin: 0; }
#loads li {
  padding: 8px 10px; border-radius: 6px; margin-bottom: 6px;
  font-size: 12px; border-left: 3px solid var(--line); background: var(--panel);
}
#loads li.check-highlight, #dfm li.check-highlight {
  outline: 2px solid #3b82f6;
  background: rgba(59, 130, 246, 0.12);
}
#loads li .finding-loc, #dfm li .finding-loc {
  font-size: 10px;
  color: var(--muted);
  margin-top: 4px;
  font-family: ui-monospace, monospace;
}
.emphasis-caption {
  font-size: 11px;
  color: #93c5fd;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-radius: 6px;
  padding: 8px 10px;
  margin-bottom: 8px;
  line-height: 1.45;
}
.emphasis-caption.warn { color: #fcd34d; border-color: rgba(245, 158, 11, 0.45); background: rgba(245, 158, 11, 0.1); }
.derived-note {
  font-size: 11px; color: var(--muted); background: rgba(59,130,246,.08);
  border: 1px solid rgba(59,130,246,.25); border-radius: 8px; padding: 8px 10px; margin-bottom: 14px;
}
#bom { list-style: none; padding: 0; margin: 0 0 12px; font-size: 12px; }
#bom li { padding: 4px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
#bom li b { color: var(--text); }
.legend { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 0; font-size: 11px; }
.legend span { display: flex; align-items: center; gap: 4px; color: var(--muted); }
.legend i { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }

.builder-seo-panel {
  padding: 28px 20px 40px;
  border-top: 1px solid var(--line);
  background: var(--bg);
  line-height: 1.55;
  color: var(--text);
}
.builder-seo-panel h2 {
  margin: 0 0 12px;
  font-size: 1.15rem;
  font-weight: 600;
}
.builder-seo-intro {
  max-width: 980px;
  margin: 0 0 16px;
  color: var(--text);
  font-size: 0.96rem;
}
.builder-seo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}
.builder-seo-grid article {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}
.builder-seo-panel h3 {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 0.92rem;
}
.builder-seo-panel article p,
.builder-seo-faq dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}
.builder-seo-faq {
  display: grid;
  grid-template-columns: minmax(160px, 0.32fr) 1fr;
  gap: 10px 16px;
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
.builder-seo-faq dt {
  margin: 0;
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 600;
}
@media (max-width: 720px) {
  .builder-seo-faq {
    grid-template-columns: 1fr;
  }
  .builder-seo-faq dd {
    margin-bottom: 8px;
  }
}