/* ============================================================
 * Utilities Bunker — Quantization Error Calculator (v2.1)
 * File: /assets/css/modules/electronics/quantization-error.v2.1.css
 * Purpose:
 * - Tool-only layout + quantization readout visuals + show-work formatting
 * - Mobile-first, 44x44 touch targets, clamp typography
 * - NO changes to ub-toolkit.v2.1.css
 * ============================================================ */

/* ==============================
   Tool-scoped tokens
   ============================== */
:root{
  --qe-radius: 16px;
  --qe-gap: 14px;
}

/* ==============================
   Hero layout (uniform with Ohm's)
   ============================== */
.ub-hero{
  display:grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--qe-gap);
}
@media (max-width: 980px){
  .ub-hero{ grid-template-columns: 1fr; }
}

/* ==============================
   Readout / Lab panel
   ============================== */
.ub-lab{
  background: var(--ub-surface-2);
  border: 1px solid var(--ub-border);
  border-radius: var(--qe-radius);
  padding: 12px;
}
.ub-lab-top{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap: 10px;
  flex-wrap:wrap;
  margin-bottom: 8px;
}
.ub-lab-title{
  font-size: clamp(13px, 1.2vw, 14px);
  font-weight: 950;
  letter-spacing: .01em;
}
.ub-lab-sub{
  font-size: 12px;
  color: var(--ub-muted);
  margin-top: 2px;
}

/* ==============================
   KPI tiles
   ============================== */
.ub-kpis{
  display:flex;
  flex-wrap:wrap;
  gap: 8px;
  justify-content:flex-end;
}
.ub-kpi{
  min-width: 120px;
  padding: 8px 10px;
  border-radius: 14px;
  border: 1px solid var(--ub-border);
  background: var(--ub-card-bg);
}
.ub-kpi .k{
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--ub-muted);
}
.ub-kpi .v{
  font-family: var(--ub-mono);
  font-weight: 950;
  font-size: 14px;
  margin-top: 2px;
}
@media (max-width: 520px){
  .ub-kpi{ min-width: 106px; }
}

/* ==============================
   Severity pill
   ============================== */
.ub-risk{
  display:inline-flex;
  align-items:center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--ub-border);
  background: var(--ub-card-bg);
  font-size: 12px;
  font-weight: 950;
  min-height: 44px;
  margin-top: 10px;
}
.ub-dot{
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ub-muted);
}

/* ==============================
   Presets row
   ============================== */
.ub-preset-row{
  display:flex;
  flex-wrap:wrap;
  gap: 10px;
  margin-top: 10px;
}
.ub-preset-row .ub-chip{
  min-height: 44px;
  padding: 10px 12px;
}

/* ==============================
   Quantization visualization block
   ============================== */
.ub-qviz{
  margin-top: 12px;
  border: 1px solid var(--ub-border);
  border-radius: 14px;
  background: var(--ub-card-bg);
  overflow:hidden;
}
.ub-qviz-head{
  padding: 10px 12px;
  border-bottom: 1px solid var(--ub-border);
  background: var(--ub-surface-2);
}
.ub-qviz-head .t{
  font-weight: 950;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ub-muted);
}
.ub-qviz-head .s{
  margin-top: 4px;
  font-size: 12px;
  color: var(--ub-muted);
}
.ub-qviz-body{
  padding: 12px;
}

/* Plot area: simple, cheap, consistent */
.ub-qviz-plot{
  position: relative;
  height: 160px;
  border-radius: 12px;
  border: 1px solid var(--ub-border);
  background: var(--ub-surface-2);
  overflow:hidden;
}
.ub-qviz-grid{
  position:absolute;
  inset:0;
  background:
    linear-gradient(to bottom, rgba(0,0,0,.06) 1px, transparent 1px) 0 0/100% 32px,
    linear-gradient(to right, rgba(0,0,0,.05) 1px, transparent 1px) 0 0/48px 100%;
  opacity: .65;
}
html.ub-theme-dark .ub-qviz-grid{
  background:
    linear-gradient(to bottom, rgba(255,255,255,.10) 1px, transparent 1px) 0 0/100% 32px,
    linear-gradient(to right, rgba(255,255,255,.08) 1px, transparent 1px) 0 0/48px 100%;
  opacity: .45;
}

/* Band: represents ~1 LSB peak-to-peak (centered), height set by JS */
.ub-qviz-band{
  position:absolute;
  left: 10%;
  bottom: 14%;
  width: 80%;
  height: 12%;
  border-radius: 10px;
  background: rgba(249,58,19,.12);
  border: 1px solid rgba(249,58,19,.28);
  box-shadow: 0 0 0 4px rgba(249,58,19,.07);
  opacity: 0;
  transition: opacity 120ms ease;
}
html.ub-theme-dark .ub-qviz-band{
  background: rgba(249,58,19,.14);
  border-color: rgba(249,58,19,.30);
}

/* Line: shows one LSB step height (anchored), height set by JS */
.ub-qviz-line{
  position:absolute;
  right: 10%;
  bottom: 14%;
  width: 14px;
  height: 18%;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(255,116,38,.95), rgba(249,58,19,.95));
  box-shadow: 0 10px 18px rgba(0,0,0,.12);
  opacity: 0;
  transition: opacity 120ms ease;
}
html.ub-theme-dark .ub-qviz-line{
  box-shadow: 0 14px 26px rgba(0,0,0,.40);
}

/* ==============================
   Inline errors + work formatting
   ============================== */
.ub-inline-error{
  margin-top: 6px;
  font-size: 12px;
  color: var(--ub-danger);
  font-weight: 800;
  min-height: 16px; /* keep layout stable */
}
.ub-work{
  font-family: var(--ub-mono);
  font-size: 13px;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap:anywhere;
}

/* ==============================
   Details polish (tool-only)
   ============================== */
.ub-collapsible summary{
  cursor:pointer;
  font-weight: 950;
  min-height: 44px;
  display:flex;
  align-items:center;
}
.ub-collapsible summary:focus{
  outline: none;
  box-shadow: 0 0 0 4px var(--ub-focus);
  border-radius: 12px;
}

/* ==============================
   Rail helper
   ============================== */
.ub-btn--block{ width:100%; }