/* ============================================================
   Utilities Bunker — RC Filter Cutoff v2.1
   File: /assets/css/modules/electronics/rc-rise.v2.1.css
   Purpose:
   - Tool-only layout + RC diagram + work formatting
   - Mobile-first, 44x44 touch targets, clamp typography
   Notes:
   - Do NOT modify ub-toolkit.v2.1.css
   ============================================================ */

/* ============================== Local tokens (tool-scoped) ============================== */
:root{
  --rc-radius: 16px;
  --rc-gap: 14px;
}

/* ============================== Header row helper ============================== */
.ub-headrow{
  display:flex;
  gap:10px;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
}

/* ============================== Tool hero layout ============================== */
.ub-hero{
  display:grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--rc-gap);
}

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

/* ============================== KPI/Lab panel ============================== */
.ub-lab{
  background: var(--ub-surface-2);
  border: 1px solid var(--ub-border);
  border-radius: var(--rc-radius);
  padding: 12px;
}

.ub-lab-top{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap: 10px;
  flex-wrap:wrap;
  margin-bottom: 10px;
}

.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 reuse toolkit tokens */
.ub-kpis{
  display:flex;
  flex-wrap:wrap;
  gap: 8px;
  justify-content:flex-end;
}

.ub-kpi{
  min-width: 128px;
  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: 112px; }
}

/* ============================== Simple RC diagram (lightweight) ============================== */
.ub-rc-diagram{
  margin-top: 10px;
  border-radius: 14px;
  border: 1px solid var(--ub-border);
  background: var(--ub-card-bg);
  padding: 12px;
  display:grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: auto auto;
  gap: 10px 12px;
  align-items:center;
}

/* Nodes */
.ub-rc-node{
  border: 1px solid var(--ub-border);
  border-radius: 14px;
  min-height: var(--ub-hit);
  padding: 10px 12px;
  background: var(--ub-surface-2);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
}

.ub-rc-label{
  font-weight: 950;
  letter-spacing: .02em;
  font-size: 12px;
  color: var(--ub-muted);
  text-transform: uppercase;
}

.ub-rc-val{
  font-family: var(--ub-mono);
  font-weight: 950;
  font-size: 13px;
}

/* Resistor block between nodes */
.ub-rc-res{
  border: 1px solid var(--ub-border);
  border-radius: 999px;
  min-height: var(--ub-hit);
  padding: 10px 12px;
  background: linear-gradient(180deg, var(--ub-card-bg), var(--ub-surface-2));
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 10px;
  position: relative;
}

/* little "wire" indicators */
.ub-rc-res::before,
.ub-rc-res::after{
  content:"";
  position:absolute;
  top:50%;
  width: 16px;
  height: 2px;
  background: var(--ub-border);
}

.ub-rc-res::before{ left: -16px; transform: translateY(-50%); }
.ub-rc-res::after{ right: -16px; transform: translateY(-50%); }

/* Capacitor down to ground under Vout */
.ub-rc-cap{
  grid-column: 3 / 4;
  grid-row: 2 / 3;
  border: 1px solid var(--ub-border);
  border-radius: 14px;
  min-height: var(--ub-hit);
  padding: 10px 12px;
  background: var(--ub-surface-2);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
  position: relative;
}

.ub-rc-cap::before{
  content:"";
  position:absolute;
  left: 16px;
  top: -10px;
  width: 2px;
  height: 10px;
  background: var(--ub-border);
}

.ub-rc-gnd{
  grid-column: 3 / 4;
  grid-row: 2 / 3;
  justify-self: start;
  margin-left: 14px;
  margin-top: calc(var(--ub-hit) + 2px);
  width: 34px;
  height: 18px;
  position: relative;
}

/* Ground symbol */
.ub-rc-gnd::before,
.ub-rc-gnd::after{
  content:"";
  position:absolute;
  left: 0;
  right: 0;
  margin: 0 auto;
  height: 2px;
  background: var(--ub-border);
  border-radius: 2px;
}
.ub-rc-gnd::before{ top: 2px; width: 34px; }
.ub-rc-gnd::after{ top: 8px; width: 22px; }
.ub-rc-gnd span{
  display:none;
}

/* Make diagram stack nicely on small screens */
@media (max-width: 640px){
  .ub-rc-diagram{
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto auto;
  }
  .ub-rc-res{
    grid-column: 1 / 2;
  }
  .ub-rc-res::before,
  .ub-rc-res::after{
    display:none;
  }
  .ub-rc-cap{
    grid-column: 1 / 2;
    grid-row: auto;
  }
  .ub-rc-gnd{
    grid-column: 1 / 2;
    grid-row: auto;
    margin-top: 0;
    margin-left: 6px;
  }
}

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

/* Details styling (tool enhancement) */
.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;
}

/* ============================== 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;
}

/* ============================== Minor helpers ============================== */
.ub-mono{
  font-family: var(--ub-mono);
}