/* ============================================================
   Utilities Bunker — Capacitor Charge/Discharge v2.1
   File: /assets/css/modules/electronics/capacitor-charge.v2.1.css
   Purpose:
   - Tool-only layout + RC circuit visuals + work formatting
   - No changes to ub-toolkit.v2.1.css
   - Mobile-first, responsive, 44x44 touch targets
   ============================================================ */

:root{
  --cap-radius: 16px;
  --cap-gap: 14px;
  --cap-soft: rgba(0,0,0,.06);
}

/* Main split hero */
.ub-hero{
  display:grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--cap-gap);
}

@media (max-width: 980px){
  .ub-hero{
    grid-template-columns: 1fr;
  }
}

/* RC lab panel */
.ub-lab{
  background: var(--ub-surface-2);
  border: 1px solid var(--ub-border);
  border-radius: var(--cap-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: 112px;
  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;
}

/* Status 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;
}

.ub-dot{
  width:10px;
  height:10px;
  border-radius:50%;
  background: var(--ub-muted);
}

/* Control chips */
.ub-wheel{
  display:grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap:10px;
  margin-top:10px;
}

.ub-wheel .ub-chip{
  min-height:44px;
  padding:10px 12px;
  border-radius:999px;
  border:1px solid var(--ub-border);
  background: var(--ub-chip-bg);
  color: var(--ub-chip-text);
  font-weight:900;
  cursor:pointer;
  user-select:none;
}

.ub-wheel .ub-chip:hover{
  background: var(--ub-chip-hover);
}

.ub-wheel .ub-chip[aria-pressed="true"]{
  border-color: rgba(249,58,19,.55);
  box-shadow: 0 0 0 4px rgba(249,58,19,.12);
}

/* Circuit diagram */
.ub-circuit{
  width:100%;
  height:auto;
  margin-top:10px;
  display:block;
  border-radius:14px;
}

@keyframes ub-flow{
  from{ stroke-dashoffset: 60; }
  to{ stroke-dashoffset: 0; }
}

.ub-flow{
  stroke-dasharray: 6 8;
  animation: ub-flow 1200ms linear infinite;
}

/* Heat + charge fill */
.ub-heat{
  opacity:.06;
}

html.ub-theme-dark .ub-heat{
  opacity:.10;
}

#capFill{
  transition:
    y 180ms ease,
    height 180ms ease,
    opacity 180ms ease;
}

#svgHeat,
#svgFlow,
#switchArm{
  transition:
    opacity 180ms ease,
    transform 180ms ease,
    stroke 180ms ease;
}

@media (prefers-reduced-motion: reduce){
  #capFill,
  #svgHeat,
  #svgFlow,
  #switchArm{
    transition:none;
  }
}

/* Presets */
.ub-preset-row{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:10px;
}

.ub-preset-row .ub-chip{
  min-height:44px;
  padding:10px 12px;
}

/* Small helper text */
.hint{
  margin-top:6px;
  font-size:12px;
  color: var(--ub-muted);
}

.ub-inline-error{
  margin-top:6px;
  font-size:12px;
  color: var(--ub-danger);
  font-weight:800;
  min-height:16px;
}

/* Slider layout */
.ub-slider-row{
  display:flex;
  gap:10px;
  align-items:center;
  flex-wrap:wrap;
}

.ub-range{
  width:min(420px, 100%);
  height:44px;
  accent-color: var(--ub-btn-grad-b);
}

/* Show work */
.ub-work{
  font-family: var(--ub-mono);
  font-size: 13px;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap:anywhere;
}

/* Details polish */
.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 buttons */
.ub-btn--block{
  width:100%;
}

/* Formula code polish */
code{
  font-family: var(--ub-mono);
  font-size: .95em;
  background: var(--ub-surface-2);
  border: 1px solid var(--ub-border);
  border-radius: 8px;
  padding: 1px 6px;
}

/* Better spacing for FAQ and formula sections */
.ub-card p code,
.ub-card li code{
  white-space: nowrap;
}

/* Mobile polish */
@media (max-width: 640px){
  .ub-kpis{
    justify-content:flex-start;
  }

  .ub-kpi{
    min-width: 98px;
  }

  .ub-wheel{
    grid-template-columns: 1fr 1fr;
  }

  .ub-slider-row > div:first-child{
    min-width:100%;
  }
}

@media (max-width: 520px){
  .ub-kpi{
    min-width: 92px;
  }

  .ub-lab,
  .ub-card{
    overflow:hidden;
  }

  .ub-preset-row .ub-chip{
    width:100%;
    justify-content:center;
  }
}