/* ============================================================
   Utilities Bunker — PWM Duty Cycle (v2.1)
   File: /assets/css/modules/electronics/pwm-duty.v2.1.css
   Purpose:
   - Tool-only layout + PWM waveform lab visuals + work formatting
   - Mobile-first, 44x44 touch targets, clamp typography
   Notes:
   - Do NOT modify ub-toolkit.v2.1.css
   ============================================================ */

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

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

/* Stack on tablet/mobile */
@media (max-width: 980px){
  .ub-hero{
    grid-template-columns: 1fr;
  }
}

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

/* ============================== Solve wheel chips (tool) ============================== */
.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);
}

/* ============================== Waveform SVG ============================== */
.ub-wave{
  width: 100%;
  height: auto;
  margin-top: 10px;
  display:block;
  border-radius: 14px;
}

.ub-svg-btn{
  cursor: pointer;
  user-select:none;
}

.ub-svg-btn:focus,
.ub-wheel .ub-chip:focus{
  outline: none;
  box-shadow: 0 0 0 4px var(--ub-focus);
  border-radius: 10px;
}

/* Pulse fill emphasis */
.ub-wave-fill{
  opacity: .14;
}

html.ub-theme-dark .ub-wave-fill{
  opacity: .22;
}

/* Moving dot */
.ub-wave-dot{
  filter: drop-shadow(0 8px 14px rgba(0,0,0,.18));
}

html.ub-theme-dark .ub-wave-dot{
  filter: drop-shadow(0 10px 18px rgba(0,0,0,.55));
}

/* Dashed guide braces */
.ub-wave-brace{
  stroke-dasharray: 6 6;
  opacity: .65;
}

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

/* Help hint + inline error */
.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 */
}

/* ============================== Range sliders (tool) ============================== */
.ub-range{
  width: min(420px, 100%);
  height: 44px; /* touch target */
  accent-color: var(--ub-btn-grad-b);
}

/* Slider row utility (safe even if toolkit doesn't define it) */
.ub-slider-row{
  display:flex;
  gap: 10px;
  align-items:center;
  flex-wrap:wrap;
}

/* ============================== Outputs / work area (tool) ============================== */
.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;
}

/* ============================== Rail button block helper (tool-only) ============================== */
.ub-btn--block{
  width: 100%;
}

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