/* ============================================================
   Utilities Bunker — Noise Figure Calculator (v2.1)
   File: /assets/css/modules/electronics/noise-figure.v2.1.css
   Purpose:
   - Tool-only layout + mode chips + KPI tiles + cascade table + work formatting
   - Mobile-first, 44x44 touch targets, clamp() typography
   Notes:
   - Do NOT modify ub-toolkit.v2.1.css
   ============================================================ */

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

/* ============================== Header row ============================== */
.ub-headrow{
  display:flex;
  gap: 10px;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}
.ub-head-actions{
  display:flex;
  gap: 10px;
  align-items:center;
  flex-wrap: wrap;
}
.ub-head-actions .ub-btn{
  min-height: var(--ub-hit);
}

/* ============================== How-to list ============================== */
.ub-steps{
  margin: 0;
  padding-left: 18px;
}
.ub-steps li{
  margin: 6px 0;
}

/* ============================== Mode bar ============================== */
.ub-modebar{
  display:flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}
.ub-modebar .ub-chip{
  min-height: var(--ub-hit);
  padding: 10px 14px;
}
.ub-modebar .ub-chip[aria-pressed="true"]{
  border-color: rgba(249,58,19,.55);
  box-shadow: 0 0 0 4px rgba(249,58,19,.12);
}

/* ============================== KPI tiles ============================== */
.ub-kpis{
  display:flex;
  flex-wrap:wrap;
  gap: 10px;
  margin-top: 6px;
}
.ub-kpi{
  min-width: 128px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--ub-border);
  background: var(--ub-card-bg);
}
.ub-kpi .k{
  font-size: 11px;
  font-weight: 950;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--ub-muted);
}
.ub-kpi .v{
  font-family: var(--ub-mono);
  font-weight: 950;
  font-size: 15px;
  margin-top: 4px;
}

/* Keep KPI row readable on very small screens */
@media (max-width: 520px){
  .ub-kpi{ min-width: 110px; }
}

/* ============================== Panels ============================== */
.ub-panel{
  margin-top: 10px;
}

/* ============================== HR helper ============================== */
.ub-hr{
  border: none;
  border-top: 1px solid var(--ub-border);
  margin: 14px 0;
}

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

/* ============================== Reference list ============================== */
.ub-ref{
  margin: 0;
  padding-left: 18px;
}
.ub-ref li{
  margin: 6px 0;
}
.ub-ref code{
  white-space: nowrap;
}

/* ============================== FAQ typography ============================== */
.ub-faq-q{
  margin: 12px 0 6px;
  font-size: clamp(14px, 0.92rem + 0.2vw, 16px);
  font-weight: 950;
}
.ub-faq-a{
  font-size: clamp(13px, 0.88rem + 0.18vw, 15px);
}

/* ============================== Cascade stage table ============================== */
.ub-stage-wrap{
  margin-top: 12px;
}

.ub-stage-table{
  border: 1px solid var(--ub-border);
  border-radius: var(--nf-radius);
  overflow: hidden;
  background: var(--ub-card-bg);
}

.ub-stage-head{
  display:grid;
  grid-template-columns: 88px 1fr 1fr 140px;
  gap: 10px;
  padding: 10px 12px;
  background: var(--ub-surface-2);
  border-bottom: 1px solid var(--ub-border);
  font-size: 12px;
  font-weight: 950;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ub-muted);
}

.ub-stage-rows{
  display:block;
}

.ub-stage-row{
  display:grid;
  grid-template-columns: 88px 1fr 1fr 140px;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(0,0,0,.06);
  align-items: center;
}
html.ub-theme-dark .ub-stage-row{
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.ub-stage-row:last-child{
  border-bottom: 0;
}

.ub-stage-row .cell--stage{
  font-family: var(--ub-mono);
  font-weight: 950;
  color: var(--ub-text);
}

/* Make table inputs nicely tappable */
.ub-stage-row input,
.ub-stage-row select{
  min-height: var(--ub-hit);
}

/* Responsive: stack stage rows on small screens */
@media (max-width: 768px){
  .ub-stage-head{ display:none; }

  .ub-stage-row{
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 12px;
  }
  .ub-stage-row .cell--stage{
    padding-bottom: 4px;
  }

  /* Add labels via pseudo headers (CSS-only) */
  .ub-stage-row .cell:nth-child(2)::before,
  .ub-stage-row .cell:nth-child(3)::before,
  .ub-stage-row .cell:nth-child(4)::before{
    display:block;
    margin-bottom: 6px;
    font-size: 11px;
    font-weight: 950;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--ub-muted);
  }
  .ub-stage-row .cell:nth-child(2)::before{ content:"Gain"; }
  .ub-stage-row .cell:nth-child(3)::before{ content:"NF / F"; }
  .ub-stage-row .cell:nth-child(4)::before{ content:"Type"; }
}

/* ============================== Print polish ============================== */
@media print{
  /* Hide drawer toggle/backdrop in print */
  .ub-rail-togglebar,
  .ub-rail-backdrop{ display:none !important; }

  /* Ensure rail prints after main content (it’s already in DOM) */
  .ub-card{ box-shadow:none; }
  a{ text-decoration: underline; }
}