/* ============================================================
 * Utilities Bunker — Battery Series/Parallel (v2.1)
 * File: /assets/css/modules/electronics/battery-series-parallel.v2.1.css
 * Purpose:
 *  - Tool-only layout + pack overview visuals + work formatting
 *  - Mobile-first, 44x44 touch targets, clamp typography
 * Notes:
 *  - Do NOT modify /assets/css/ub-toolkit.v2.1.css
 * ============================================================ */

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

/* ============================== Hero layout ============================== */
.ub-hero{
  display:grid;
  grid-template-columns: 1.10fr 0.90fr;
  gap: var(--bsp-gap);
}
@media (max-width: 980px){
  .ub-hero{ grid-template-columns: 1fr; }
}

/* ============================== Pack overview panel ============================== */
.ub-pack{
  background: var(--ub-surface-2);
  border: 1px solid var(--ub-border);
  border-radius: var(--bsp-radius);
  padding: 12px;
}

.ub-pack-top{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap: 10px;
  flex-wrap:wrap;
  margin-bottom: 8px;
}

.ub-pack-title{
  font-size: clamp(13px, 1.2vw, 14px);
  font-weight: 950;
  letter-spacing: .01em;
}

.ub-pack-sub{
  font-size: 12px;
  color: var(--ub-muted);
  margin-top: 2px;
}

/* ============================== KPI tiles (reuse structure from Ohm page style) ============================== */
.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;
  margin-top: 8px;
}

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

/* ============================== Pack diagram ============================== */
.ub-diagram{
  margin-top: 12px;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid var(--ub-border);
  background: var(--ub-card-bg);
}

.ub-diagram-grid{
  display:grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}

@media (max-width: 520px){
  .ub-diagram-grid{ grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.ub-diagram-grid .cell{
  min-height: 44px; /* touch target baseline even though decorative */
  border-radius: 12px;
  border: 1px solid var(--ub-border);
  background: linear-gradient(180deg, var(--ub-surface-2), var(--ub-surface-3));
  position: relative;
  overflow: hidden;
}

.ub-diagram-grid .cell::before{
  content:"";
  position:absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(249,58,19,.18), transparent 55%);
  opacity: .9;
}

html.ub-theme-dark .ub-diagram-grid .cell::before{
  opacity: .7;
}

.ub-diagram-note{
  margin-top: 10px;
  font-size: 12px;
  color: var(--ub-muted);
}

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

/* ============================== Inline hint + error (keep consistent) ============================== */
.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; /* keeps layout stable */
}

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

/* Make details summary feel clickable and accessible */
.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 helper (tool-only) ============================== */
.ub-btn--block{ width: 100%; }

/* ============================== Small screens polish ============================== */
@media (max-width: 520px){
  .ub-kpi{ min-width: 98px; }
}