/* ======================================================================
   GENERATED FILE -- do not edit directly.
   Rebuilt from css/_head.css (+ css/_extra.css, where present) and
   apps/_shared/css/app-shell.css by apps/_shared/sync-apps.py.
   Edit one of those source files, then re-run the sync script.
   ====================================================================== */

/*
  Virtual Oscilloscope — standalone PWA
  ------------------------------------------------------------------
  Root design tokens (from the DiMastro site's styles.css) + the
  shared .tbc card styles (tube-bias-calculator.css) + the input-grid
  and result-strip components (bench-calculators.css) + the scope
  widget's own styles (virtual-oscilloscope.css), combined into one
  file, plus an app-shell layer at the bottom.
*/

:root {
  --tbc-bg:            #1c1712;
  --tbc-panel:         #221b15;
  --tbc-panel-raised:  #2a2119;
  --tbc-well:          #16110d;
  --tbc-border:        #3c2f22;
  --tbc-border-soft:   #2f261c;

  --tbc-ink:           #f3ead9;
  --tbc-ink-muted:     #dfd0bd;
  --tbc-ink-faint:     #cd9c60;

  --tbc-glow:          #ff9142;
  --tbc-glow-dim:      #c96a2c;
  --tbc-glow-soft:     rgba(255, 145, 66, 0.16);

  --tbc-cold:          #4da3ff;
  --tbc-safe:          #7cbf8e;
  --tbc-warn:          #e7b84f;
  --tbc-warn-soft:     rgba(231, 184, 79, 0.14);
  --tbc-danger:        #e0522e;
  --tbc-danger-soft:   rgba(224, 82, 46, 0.14);

  --tbc-font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --tbc-font-body:    "IBM Plex Sans", "Segoe UI", sans-serif;
  --tbc-font-mono:    "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --tbc-radius:    14px;
  --tbc-radius-sm: 8px;
}


.tbc {
  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;
}

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

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

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

.tbc-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;
}

.tbc-title {
  font-family: var(--tbc-font-display);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 6px;
  color: var(--tbc-ink);
}

.tbc-sub {
  font-size: 13.5px;
  color: var(--tbc-ink-muted);
  margin: 0;
  max-width: 100ch;
}

.tbc-badge {
  flex: none;
  font-family: var(--tbc-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tbc-ink-faint);
  border: 1px solid var(--tbc-border);
  border-radius: 999px;
  padding: 5px 10px;
  white-space: nowrap;
}

/* ---------- warning strip ---------- */
.tbc-warning {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--tbc-danger-soft);
  border: 1px solid rgba(224, 82, 46, 0.35);
  border-radius: var(--tbc-radius-sm);
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.5;
  color: #f0d3c8;
  margin-bottom: 22px;
}
.tbc-warning[hidden] { display: none; }

.tbc-warning svg { flex: none; margin-top: 2px; color: var(--tbc-danger); }
.tbc-warning strong { color: #fff; }

/* ---------- database-load notice (shown only on the EMBEDDED_TUBES_CSV fallback) ---------- */
.tbc-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: 22px;
}
.tbc-db-notice[hidden] { display: none; }

.tbc-db-notice svg { flex: none; margin-top: 2px; color: var(--tbc-warn); }
.tbc-db-notice strong { color: var(--tbc-warn); }

/* ---------- setup row (tube + voltage) ---------- */
.tbc-setup {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 14px;
  padding: 18px;
  background: rgba(42, 33, 25, 0.8);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius-sm);
}

.tbc-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12.5px;
  color: var(--tbc-ink-muted);
}

.tbc-field-label {
  font-family: var(--tbc-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tbc-ink-faint);
}

.tbc-select,
.tbc-input {
  font-family: var(--tbc-font-body);
  font-size: 15px;
  color: var(--tbc-ink);
  background: var(--tbc-well);
  border: 1px solid var(--tbc-border);
  border-radius: 8px;
  padding: 10px 12px;
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

.tbc-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23b3a28c' stroke-width='1.6' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.tbc-input:focus, .tbc-select:focus {
  border-color: var(--tbc-glow-dim);
  box-shadow: 0 0 0 3px var(--tbc-glow-soft);
  outline: none;
}

.tbc-input-unit {
  position: relative;
  display: flex;
  align-items: center;
}

.tbc-input-unit .tbc-input { padding-right: 54px; }

.tbc-unit {
  position: absolute;
  right: 12px;
  font-family: var(--tbc-font-mono);
  font-size: 11.5px;
  color: var(--tbc-ink-faint);
  pointer-events: none;
}

.tbc-hint {
  grid-column: 1 / -1;
  margin: 2px 0 0;
  font-size: 12.5px;
  color: var(--tbc-ink-faint);
  min-height: 1.4em;
}

.tbc-hint strong { color: var(--tbc-ink-muted); font-weight: 600; }

/* ---------- Class A / Class AB reference strip ---------- */
.tbc-reference {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--tbc-border-soft);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius-sm);
  overflow: hidden;
  margin: 18px 0;
}

.tbc-ref-col {
  background: rgba(34, 27, 21, 0.8);
  padding: 14px 16px;
}

.tbc-ref-col h3 {
  font-family: var(--tbc-font-display);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--tbc-ink-muted);
  margin: 0 0 10px;
}

.tbc-ref-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 5px 0;
  border-top: 1px dashed var(--tbc-border-soft);
  font-size: 12.5px;
}

.tbc-ref-row:first-of-type { border-top: none; }

.tbc-ref-row dt { color: var(--tbc-ink-muted); font-weight: 400; }
.tbc-ref-row dt span {
  display: inline-block;
  margin-left: 5px;
  font-family: var(--tbc-font-mono);
  font-size: 10.5px;
  color: var(--tbc-ink-faint);
}
.tbc-ref-row dd {
  margin: 0;
  font-family: var(--tbc-font-mono);
  font-size: 13.5px;
  color: var(--tbc-ink);
  white-space: nowrap;
}

/* ---------- gauge class selector ---------- */
.tbc-class-select {
  max-width: 200px;
  margin: 0 0 18px;
}

/* ---------- mode dial ---------- */
.tbc-modes {
  display: flex;
  gap: 6px;
  border-bottom: 1px solid var(--tbc-border-soft);
  margin-bottom: 18px;
  overflow-x: auto;
  scrollbar-width: none;
}
.tbc-modes::-webkit-scrollbar { display: none; }

.tbc-mode-btn {
  flex: none;
  font-family: var(--tbc-font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--tbc-ink-faint);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 6px 12px;
  margin-right: 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 120ms ease, border-color 120ms ease;
}

.tbc-mode-btn:hover { color: var(--tbc-ink-muted); }

.tbc-mode-btn.is-active {
  color: var(--tbc-glow);
  border-bottom-color: var(--tbc-glow);
}

/* ---------- calculation panel ---------- */
.tbc-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  align-items: start;
}

.tbc-mode-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.tbc-mode-group[hidden] { display: none; }

.tbc-mode-copy {
  font-size: 12.5px;
  color: var(--tbc-ink-faint);
  margin: 0 0 2px;
  line-height: 1.5;
}

/* ---------- readout / gauge ---------- */
.tbc-readout {
  position: relative;
  background: var(--tbc-panel-raised);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius-sm);
  padding: 16px 18px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  overflow: hidden;
}

.tbc-tube-frame {
  position: absolute;
  top: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 92%;
  opacity: 0.3;
  z-index: 0;
  pointer-events: none;
}

.tbc-tube-photo { width: 100%; height: auto; display: block; }

.tbc-gauge-wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 240px;
}

.tbc-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));
}

.tbc-gauge-figure {
  font-family: var(--tbc-font-mono);
  font-size: 22px;
  fill: #ffffff;
}

.tbc-gauge-label {
  font-family: var(--tbc-font-body);
  font-size: 9.5px;
  fill: var(--tbc-ink);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

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

.tbc-readout-values {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 16px;
  width: 100%;
  margin-top: 2px;
}

.tbc-big-value {
  text-align: center;
  padding-top: 8px;
  border-top: 1px solid var(--tbc-border-soft);
}

.tbc-big-value .tbc-num {
  display: block;
  font-family: var(--tbc-font-mono);
  font-size: 19px;
  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;
}

.tbc-big-value small {
  display: block;
  font-size: 10px;
  color: var(--tbc-ink);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.9);
/*  text-transform: uppercase;*/
  letter-spacing: 0.05em;
  margin-top: 2px;
}

.tbc-steps {
  width: 100%;
  margin: 6px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--tbc-border-soft);
  font-size: 11.5px;
  color: var(--tbc-ink);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.95), 0 0 6px rgba(0, 0, 0, 0.8);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.tbc-steps span { color: #ffffff; font-family: var(--tbc-font-mono); }

/* ---------- bench reference table ---------- */
.tbc-bench {
  margin-top: 22px;
  border-top: 1px solid var(--tbc-border-soft);
  padding-top: 14px;
}

.tbc-bench summary {
  cursor: pointer;
  font-family: var(--tbc-font-display);
  font-size: 13px;
  color: var(--tbc-ink-muted);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
.tbc-bench summary::-webkit-details-marker { display: none; }
.tbc-bench summary::before {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 150ms ease;
}
.tbc-bench[open] summary::before { transform: rotate(45deg); }

.tbc-bench-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 12.5px;
}
.tbc-bench-table th, .tbc-bench-table td {
  text-align: left;
  padding: 7px 10px;
  border-bottom: 1px solid var(--tbc-border-soft);
}
.tbc-bench-table th {
  font-family: var(--tbc-font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--tbc-ink-faint);
  font-weight: 400;
}
.tbc-bench-table td { color: var(--tbc-ink-muted); font-family: var(--tbc-font-mono); }
.tbc-bench-table td:first-child { font-family: var(--tbc-font-body); color: var(--tbc-ink); }

/* ---------- footer ---------- */
.tbc-footer {
  margin-top: 18px;
  font-size: 11.5px;
  color: var(--tbc-ink-faint);
  line-height: 1.6;
}

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .tbc { padding: 20px 16px; }
  .tbc-setup { grid-template-columns: 1fr; }
  .tbc-reference { grid-template-columns: 1fr; }
  .tbc-panel { grid-template-columns: 1fr; }
  .tbc-title { font-size: 22px; }
  .tbc-tube-frame { width: 90%; }
}

@media (prefers-reduced-motion: reduce) {
  .tbc-select, .tbc-input, .tbc-mode-btn { transition: none; }
  .tbc-gauge * { transition: none !important; }
}

/* ---------- input grids (from bench-calculators.css) ---------- */
.tbc-grid-2,
.tbc-grid-3 {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
}
.tbc-grid-2 { grid-template-columns: 1fr 1fr; }
.tbc-grid-3 { grid-template-columns: 1fr 1fr 1fr; }

/* ---------- results strip (2 or 3 up) ---------- */
.tbc-results {
  display: grid;
  grid-template-columns: repeat(var(--tbc-results-cols, 2), 1fr);
  gap: 12px;
  margin-top: 18px;
}

.tbc-result-item {
  background: rgba(42, 33, 25, 0.8);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius-sm);
  padding: 14px 14px 12px;
  text-align: center;
}

.tbc-result-label {
  font-family: var(--tbc-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--tbc-ink-faint);
  margin: 0 0 6px;
}

.tbc-result-value {
  font-family: var(--tbc-font-mono);
  font-size: 20px;
  color: var(--tbc-glow);
  text-shadow: 0 0 18px var(--tbc-glow-soft);
  line-height: 1.2;
}

@media (max-width: 640px) {
  .tbc-grid-2, .tbc-grid-3 { grid-template-columns: 1fr; }
  .tbc-results { grid-template-columns: repeat(2, 1fr); }
}


/* Virtual Oscilloscope
   Scoped classes below (.vs-*, plus the .ts-knob/.ts-ctl widget reused
   from the Tone Stack Calculator's knob component) sit inside the
   shared .tbc card above, same as every other bench tool. */
/*
  DiMastro — Virtual Oscilloscope (staging preview)
  --------------------------------------------------
  Loaded after bench-calculators.css. Adds the two component types that
  page doesn't already have: range sliders and the scope canvas. Everything
  else on this page (fields, result cards, warning note, header) reuses the
  existing .tbc-* classes untouched.
*/

.vs-slider-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
}
.vs-slider-row .tbc-field-label { margin: 0; }
.vs-slider-val {
  font-family: var(--tbc-font-mono);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--tbc-glow);
}

.vs-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 999px;
  background: var(--tbc-border);
  outline: none;
  margin: 4px 0 2px;
}
.vs-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--tbc-glow);
  border: 2px solid var(--tbc-panel);
  cursor: pointer;
}
.vs-range::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--tbc-glow);
  border: 2px solid var(--tbc-panel);
  cursor: pointer;
}

.vs-scope {
  position: relative;
  padding: 0;
  margin-bottom: 18px;
  background: transparent;
  box-shadow: none;
}
.vs-scope-inner {
  background: linear-gradient(155deg, #9a9b9f 0%, #7d7e82 100%);
  border-radius: 10px;
  padding: 10px;
  box-shadow: inset 0 2px 5px rgba(0,0,0,0.5);
}
.vs-scope canvas { display: block; width: 100%; height: auto; border-radius: 3px; }

.vs-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}
.vs-compare-card {
  background: rgba(34, 27, 21, 0.6);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius-sm);
  padding: 10px 12px;
}
.vs-compare-card .who {
  font-family: var(--tbc-font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--tbc-ink-faint);
  margin: 0 0 4px;
}
.vs-compare-card .num {
  font-family: var(--tbc-font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--tbc-ink);
}

@media (max-width: 640px) {
  .vs-compare { grid-template-columns: 1fr; }
}

/* ── scope + pitch knob row, wrapped in a single card ── */
.vs-scope-card {
  background: rgb(69 69 69 / 80%);
  border: 1.5px solid #919191;
  border-radius: var(--tbc-radius-sm);
  padding: 16px;
  margin-bottom: 18px;
}
.vs-scope-row {
  display: flex;
  align-items: flex-start;
  gap: 18px;
}
.vs-scope-row .vs-scope { flex: 1 1 auto; margin-bottom: 0; min-width: 0; }
.vs-pitch-col {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 84px;
}
.vs-pitch-col .ts-ctl-name { color: var(--tbc-ink-muted); }
.vs-pitch-col .ts-ctl-num { color: var(--tbc-glow); text-shadow: none; }
.vs-knob-sm { width: 44px; height: 44px; }

@media (max-width: 640px) {
  .vs-scope-row { flex-direction: column; }
  .vs-pitch-col { flex-direction: row; flex-wrap: wrap; justify-content: center; width: auto; gap: 14px; }
}

/* ── graphical knobs, ported from the Tone Stack Calculator's .ts-knob
   widget: real rotating knob images, per-brand faceplate colors and
   badge, same drag/keyboard/wheel interaction. ── */
.ts-controls { margin-top: 4px; }

.ts-knobs-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
  gap: 18px 30px;
  padding: 16px 20px;
  background:
    linear-gradient(180deg, var(--face-hi, #d2d5df) 0%, var(--face-mid, #bfbfc5) 45%, var(--face-lo, #898885) 100%);
  border: 1.5px solid var(--face-outline, #498aa5);
  border-radius: var(--tbc-radius-sm);
  outline: 1.5px solid var(--face-outline, #498aa5);
  outline-offset: 4px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .5), inset 0 -1px 0 rgba(0, 0, 0, .15);
  transition: background .2s ease, border-color .2s ease, outline-color .2s ease;
}

.ts-badge-wrap { flex: 1 1 auto; display: flex; justify-content: center; align-items: center; min-width: 40px; overflow: hidden; }
.ts-badge { height: 84px; width: auto; max-width: 100%; display: block; object-fit: contain; }

.ts-knobs-group { display: flex; flex-wrap: nowrap; justify-content: center; gap: 18px 26px; flex-shrink: 0; }

@media (max-width: 640px) {
  .ts-knobs-row { flex-direction: column; flex-wrap: wrap; }
  .ts-badge-wrap { flex: 0 0 auto; width: 100%; }
}

.ts-ctl { display: flex; flex-direction: column; align-items: center; gap: 6px; width: 84px; }
.ts-ctl[data-disabled="true"] { opacity: .45; }

.ts-knobs-row .ts-ctl-name {
  font-family: var(--tbc-font-display); font-size: 12px; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase; color: var(--face-text, #232427);
}

.ts-knob { position: relative; width: 64px; height: 64px; cursor: ns-resize; touch-action: none; border-radius: 50%; }
.ts-knob-face { display: block; width: 100%; height: 100%; pointer-events: none; user-select: none; -webkit-user-drag: none; }
.ts-knob:focus-visible { outline: 2px solid var(--tbc-glow); outline-offset: 3px; }
.ts-knob[aria-disabled="true"] { cursor: default; }

.ts-ctl-num { font: 700 12.5px var(--tbc-font-mono); color: var(--face-text, #232427); text-shadow: 0 1px 2px rgba(0,0,0,0.25); }

/* ── signal generator: same card treatment as the scope, wrapping the
   frequency-preset dropdown + the 7-segment LED readout ── */
.vs-siggen-card {
  background: rgb(69 69 69 / 80%);
  border: 1.5px solid #919191;
  border-radius: var(--tbc-radius-sm);
  padding: 16px;
  margin-bottom: 18px;
}
.vs-siggen-row {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  margin-bottom: 0;
}
.vs-siggen-select { flex: 1 1 auto; min-width: 0; margin-bottom: 0; }

.vs-seg-card {
  flex: 0 0 auto;
  background: rgba(42, 33, 25, 0.8);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius-sm);
  padding: 8px;
}
.vs-seg-frame {
  padding: 3px;
  border-radius: 5px;
  background: linear-gradient(155deg, #6b6d72 0%, #38393c 55%, #232427 100%);
  box-shadow: inset 0 1px 1px rgba(255,255,255,0.25), inset 0 -1px 1px rgba(0,0,0,0.5);
}
.vs-seg-panel {
  background: #0a0806;
  border-radius: 3px;
  padding: 7px 10px;
  display: flex;
  justify-content: center;
}
.vs-seg-display { display: flex; gap: 3px; }
.vs-seg-digit-svg { display: block; flex: none; }

@media (max-width: 640px) {
  .vs-siggen-row { flex-direction: column; align-items: stretch; }
  .vs-seg-card { align-self: center; }
}

@media (prefers-reduced-motion: reduce) {
  .vs-range, .ts-knob { transition: none !important; }
}

/* ==================================================================
   APP SHELL — standalone PWA layer
   ================================================================== */

/* ======================================================================
   Shared PWA app-shell layer — canonical source
   ----------------------------------------------------------------------
   Generic standalone-app chrome shared by every DiMastro GTA PWA
   (safe-area insets, .install-gate, .tbc-db-notice, and related
   install/offline UI). Written against the --tbc-* custom properties;
   each app's own :root block (in its own css/_head.css) either
   declares --tbc-* directly, or aliases its own token names to them.

   DO NOT EDIT apps/<name>/css/styles.css directly for anything in this
   section — edit this file instead, then run:
     python3 apps/_shared/sync-apps.py
   to regenerate every app's actual served styles.css. Edits made
   straight to a generated styles.css will be overwritten on next sync.

   Tool-specific widget CSS (the calculator itself) lives in each app's
   own css/_head.css and is untouched by this file or the sync script.
   ====================================================================== */

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

html, body {
  margin: 0;
  padding: 0;
  background: var(--tbc-bg);
  color: var(--tbc-ink);
  min-height: 100%;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior-y: none;
}

body {
  font-family: var(--tbc-font-body);
  /* Safe-area padding so content clears the iPhone notch / home
     indicator when running standalone (added to home screen). */
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

.app-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: calc(env(safe-area-inset-top) + 14px) 18px 14px;
  background: linear-gradient(180deg, rgba(28, 23, 18, 1) 0%, rgba(28, 23, 18, 0.94) 100%);
  border-bottom: 1px solid var(--tbc-border-soft);
  position: sticky;
  top: 0;
  z-index: 20;
}

.app-header img {
  width: 26px;
  height: 26px;
  border-radius: 6px;
}

.app-header h1 {
  font-family: var(--tbc-font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--tbc-ink);
  margin: 0;
  letter-spacing: 0.01em;
}

.app-header-brand {
  font-family: var(--tbc-font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--tbc-ink);
  margin-left: auto;
  white-space: nowrap;
}

.app-header-brand-gta {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--tbc-ink-faint);
}

main.app-main {
  padding: 20px 14px calc(40px + env(safe-area-inset-bottom));
}

/* the .tbc widget already caps at 760px and centers itself, this just
   removes its normal page-embedded spacing assumptions */
/* Tools with their own content wrapper (not .tbc) already set their
   own width in the section above — this rule only matters on tools
   that actually use .tbc for their widget. */

.app-footer {
  max-width: 960px;
  margin: 18px auto 0;
  padding: 0 4px;
  font-size: 11.5px;
  color: var(--tbc-ink-faint);
  text-align: center;
  line-height: 1.6;
}

.app-footer a { color: var(--tbc-glow-dim); }

/* Offline / update banners */
.app-banner {
  position: fixed;
  left: 14px;
  right: 14px;
  bottom: calc(14px + env(safe-area-inset-bottom));
  z-index: 50;
  display: none;
  align-items: center;
  gap: 10px;
  background: var(--tbc-panel-raised);
  border: 1px solid var(--tbc-border);
  border-radius: var(--tbc-radius-sm);
  padding: 12px 14px;
  font-size: 13px;
  color: var(--tbc-ink-muted);
  box-shadow: 0 12px 30px -12px rgba(0,0,0,0.6);
}

.app-banner.is-visible { display: flex; }

.app-banner button {
  margin-left: auto;
  background: var(--tbc-glow);
  color: #241a0f;
  border: none;
  border-radius: 999px;
  padding: 7px 14px;
  font-family: var(--tbc-font-display);
  font-weight: 600;
  font-size: 12.5px;
  cursor: pointer;
}

.app-banner .app-banner-dismiss {
  background: transparent;
  color: var(--tbc-ink-faint);
  padding: 7px 8px;
}

@media (max-width: 420px) {
  .app-header h1 { font-size: 14.5px; }
  .app-header-brand,
  .app-header-brand-gta { font-size: 16px; }
}

/* ==================================================================
   INSTALL GATE
   ================================================================== */

.install-gate {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  padding-top: calc(24px + env(safe-area-inset-top));
  padding-bottom: calc(24px + env(safe-area-inset-bottom));
  background:
    radial-gradient(120% 140% at 50% -10%, rgba(255, 145, 66, 0.10) 0%, transparent 55%),
    var(--tbc-bg);
}

.install-gate.is-hidden { display: none; }

.install-gate-card {
  max-width: 380px;
  width: 100%;
  text-align: center;
  background: var(--tbc-panel);
  border: 1px solid var(--tbc-border);
  border-radius: var(--tbc-radius);
  padding: 34px 26px 26px;
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.7);
}

.install-gate-icon {
  width: 72px;
  height: 72px;
  border-radius: 16px;
  margin-bottom: 18px;
}

.install-gate-card h2 {
  font-family: var(--tbc-font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--tbc-ink);
  margin: 0 0 10px;
}

.install-gate-sub {
  font-size: 13.5px;
  color: var(--tbc-ink-muted);
  line-height: 1.6;
  margin: 0 0 24px;
}

.install-gate-btn {
  width: 100%;
  background: var(--tbc-glow);
  color: #241a0f;
  border: none;
  border-radius: 999px;
  padding: 13px 18px;
  font-family: var(--tbc-font-display);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  margin-bottom: 16px;
  transition: background-color 140ms ease;
}
.install-gate-btn:hover { background: var(--tbc-glow-dim); }

.install-gate-ios-hint {
  font-size: 13px;
  color: var(--tbc-ink-muted);
  background: rgba(34, 27, 21, 0.8);
  border: 1px solid var(--tbc-border-soft);
  border-radius: var(--tbc-radius);
  padding: 12px 14px;
  margin: 0 0 16px;
  line-height: 1.6;
}
.install-gate-ios-hint svg { vertical-align: -3px; margin: 0 2px; color: var(--tbc-glow); }
.install-gate-ios-hint strong { color: var(--tbc-ink); }



.install-gate-link {
  display: block;
  font-size: 13px;
  color: var(--tbc-glow-dim);
  text-decoration: underline;
  margin-bottom: 12px;
}
.install-gate-link:hover { color: var(--tbc-glow); }

.install-gate-back-btn {
  display: inline-block;
  margin-top: 6px;
  padding: 5px 12px;
  font-size: 11.5px;
  color: var(--tbc-ink-faint);
  background: rgba(205, 156, 96, 0.14);
  border: 1px solid rgba(205, 156, 96, 0.35);
  border-radius: 999px;
  text-decoration: none;
}
.install-gate-back-btn:hover {
  background: rgba(205, 156, 96, 0.22);
  color: var(--tbc-ink);
}

.install-gate-skip {
  display: inline-block;
  background: rgba(77, 163, 255, 0.14);
  border: 1px solid rgba(77, 163, 255, 0.35);
  color: var(--tbc-cold);
  font-size: 12px;
  cursor: pointer;
  text-decoration: none;
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 10px;
}
.install-gate-skip:hover { background: rgba(77, 163, 255, 0.22); color: var(--tbc-ink); }

.tbc-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: 22px;
}
.tbc-db-notice[hidden] { display: none; }
.tbc-db-notice svg { flex: none; margin-top: 2px; color: var(--tbc-warn); }
.tbc-db-notice strong { color: var(--tbc-warn); }