/*
  Tube Tester / Mutual Conductance (gm) Calculator — stylesheet
  ------------------------------------------------------------------
  Namespaced under .gmc, built on the shared --tbc-* design tokens
  from css/styles.css (same as every other calculator widget site-wide).
*/

.gmc {
  font-family: var(--tbc-font-body);
  color: var(--tbc-ink);
  background:
    radial-gradient(120% 140% at 15% -10%, rgba(44, 33, 23, 0.8) 0%, transparent 55%),
    linear-gradient(175deg, rgba(34, 27, 21, 0.8) 0%, rgba(28, 23, 18, 0.8) 100%);
  border: 1px solid var(--tbc-border);
  border-radius: var(--tbc-radius);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.04) inset,
    0 30px 60px -30px rgba(0, 0, 0, 0.6);
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 28px 24px;
  box-sizing: border-box;
  position: relative;
}

.gmc *, .gmc *::before, .gmc *::after { box-sizing: border-box; }

.gmc :focus-visible {
  outline: 2px solid var(--tbc-glow);
  outline-offset: 2px;
}

.gmc-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.gmc-eyebrow {
  font-family: var(--tbc-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--tbc-glow);
  margin: 0 0 6px;
}

.gmc-title {
  font-family: var(--tbc-font-display);
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--tbc-ink);
}

.gmc-sub {
  font-size: 13.5px;
  color: var(--tbc-ink-muted);
  margin: 0;
  max-width: 46ch;
}

.gmc-badge {
  flex: none;
  font-family: var(--tbc-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--tbc-glow);
  border: 1px solid var(--tbc-glow-dim);
  background: var(--tbc-glow-soft);
  border-radius: 999px;
  padding: 4px 10px;
}

.gmc-point {
  background: var(--tbc-well);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius-sm);
  padding: 16px;
  margin-bottom: 14px;
}

.gmc-point-title {
  font-family: var(--tbc-font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--tbc-ink);
  margin: 0 0 12px;
}

.gmc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}

.gmc-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.gmc-field-label {
  font-size: 12px;
  color: var(--tbc-ink-muted);
}

.gmc-input-unit {
  display: flex;
  align-items: center;
  background: var(--tbc-panel-raised);
  border: 1px solid var(--tbc-border);
  border-radius: var(--tbc-radius-sm);
  overflow: hidden;
}
.gmc-input {
  font-family: var(--tbc-font-body);
  font-size: 14.5px;
  color: var(--tbc-ink);
  background: transparent;
  border: none;
  padding: 10px 12px;
  flex: 1;
  width: 100%;
}
.gmc-unit {
  flex: none;
  font-family: var(--tbc-font-mono);
  font-size: 12px;
  color: var(--tbc-ink-faint);
  padding: 0 12px;
  border-left: 1px solid var(--tbc-border);
}

.gmc-derived {
  margin-top: 10px;
  font-family: var(--tbc-font-mono);
  font-size: 12px;
  color: var(--tbc-ink-faint);
}
.gmc-derived strong { color: var(--tbc-ink-muted); }

.gmc-readout {
  background: var(--tbc-panel-raised);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius-sm);
  padding: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin: 4px 0 16px;
}

.gmc-gauge-wrap {
  width: 100%;
  max-width: 240px;
}

.gmc-gauge {
  width: 100%;
  height: auto;
  display: block;
  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.9)) drop-shadow(0 0 4px rgba(0, 0, 0, 0.9));
}

.gmc-gauge-figure {
  font-family: var(--tbc-font-mono);
  font-size: 20px;
  fill: #ffffff;
}

.gmc-gauge-label {
  font-family: var(--tbc-font-body);
  font-size: 9px;
  fill: var(--tbc-ink);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.gmc-gauge-tick {
  font-family: var(--tbc-font-mono);
  font-size: 8.5px;
  fill: var(--tbc-ink);
}

.gmc-values-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 14px 20px;
  width: 100%;
}

.gmc-big-value {
  text-align: center;
  padding: 6px 4px 0;
}

.gmc-big-value .gmc-num {
  display: block;
  font-family: var(--tbc-font-mono);
  font-size: 22px;
  color: var(--tbc-glow);
  text-shadow: 0 0 18px var(--tbc-glow-soft), 0 1px 3px rgba(0, 0, 0, 0.9);
  line-height: 1.2;
}

.gmc-big-value.is-secondary .gmc-num {
  color: var(--tbc-ink);
  text-shadow: none;
  font-size: 16px;
}

.gmc-big-value small {
  display: block;
  font-size: 10.5px;
  color: var(--tbc-ink-muted);
  letter-spacing: 0.03em;
  margin-top: 4px;
}

.gmc-verdict {
  font-size: 13px;
  padding: 10px 14px;
  border-radius: var(--tbc-radius-sm);
  border: 1px solid var(--tbc-border-soft);
  background: var(--tbc-well);
  color: var(--tbc-ink-muted);
  margin-bottom: 14px;
}
.gmc-verdict.is-good { border-color: var(--tbc-safe); color: var(--tbc-safe); }
.gmc-verdict.is-warn { border-color: var(--tbc-warn); color: var(--tbc-warn); }
.gmc-verdict.is-bad { border-color: var(--tbc-danger); color: var(--tbc-danger); }

.gmc-formula {
  font-family: var(--tbc-font-mono);
  font-size: 11.5px;
  color: var(--tbc-ink-faint);
  background: var(--tbc-well);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius-sm);
  padding: 10px 14px;
  margin: 0;
  line-height: 1.6;
}

.gmc-db-notice {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--tbc-warn-soft);
  border: 1px solid rgba(231, 184, 79, 0.35);
  border-radius: var(--tbc-radius-sm);
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--tbc-ink-muted);
  margin-bottom: 18px;
}
.gmc-db-notice svg { flex: none; margin-top: 2px; color: var(--tbc-warn); }
.gmc-db-notice strong { color: var(--tbc-warn); }

@media (max-width: 560px) {
  .gmc { padding: 20px 18px 18px; }
  .gmc-title { font-size: 19px; }
}