:root {
  --system-accent: #e00012;
  --system-accent-2: #ff3040;
  --system-green: #42d36b;
  --system-amber: #f2b84b;
  --system-cyan: #68d8ff;
}

.system-check-shell {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
  display: grid;
  gap: 12px;
}

.page-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 390px);
  gap: 16px;
  align-items: end;
}

.tagline,
.panel-kicker {
  color: var(--green, #42d36b);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.panel-kicker {
  color: var(--muted, #a5adb8);
  margin-bottom: 4px;
  font-size: 11px;
}

.system-title {
  margin: 0;
  font-size: clamp(34px, 5vw, 60px);
  line-height: .92;
  letter-spacing: -0.078em;
  font-weight: 980;
  color: var(--text, #f2f4f7);
}

.system-sub {
  margin: 10px 0 0;
  color: var(--muted, #a5adb8);
  line-height: 1.5;
  font-size: 14px;
  max-width: 760px;
}

.warning {
  border: 1px solid rgba(242,184,75,0.28);
  background: rgba(242,184,75,0.08);
  color: #ffd886;
  border-radius: 12px;
  padding: 10px 11px;
  font-size: 12px;
  line-height: 1.45;
  font-weight: 850;
}

.intro-counter {
  justify-content: flex-end;
  margin-top: 10px;
}

.master-control {
  display: grid;
  grid-template-columns: minmax(210px, .5fr) minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 14px;
}

.master-volume {
  border: 1px solid var(--line-soft, #2d333d);
  background: rgba(0,0,0,.12);
  border-radius: 14px;
  padding: 11px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted, #a5adb8);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 6px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--system-accent-2);
}

.master-status {
  min-height: 62px;
  border: 1px solid var(--line-soft, #2d333d);
  background: #11151a;
  border-radius: 14px;
  padding: 11px 12px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  color: var(--muted, #a5adb8);
  font-size: 13px;
  line-height: 1.38;
}

.master-status strong {
  color: var(--text, #f2f4f7);
  font-size: 15px;
}

.stop-button {
  min-height: 62px;
  min-width: 112px;
  border-radius: 14px;
  border: 1px solid rgba(255,82,96,.48);
  background: linear-gradient(180deg, #3a151a, #191d23);
  color: #ffd9dd;
  font-weight: 1000;
  letter-spacing: .08em;
  cursor: pointer;
}

.stop-button:not(:disabled) {
  background: linear-gradient(180deg, var(--system-accent-2), #8d000a);
  color: #fff;
  box-shadow: 0 10px 28px rgba(224,0,18,.22), var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
}

.stop-button:disabled {
  opacity: .45;
  cursor: not-allowed;
}

.test-tabs {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
}

.test-tab {
  border: 1px solid var(--line, #3b4350);
  background: linear-gradient(180deg, rgba(35,40,50,.98), rgba(23,26,32,.98));
  color: var(--muted, #a5adb8);
  border-radius: 14px;
  min-height: 58px;
  padding: 10px;
  font-weight: 950;
  letter-spacing: -.02em;
  cursor: pointer;
  box-shadow: var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
}

.test-tab.active {
  color: #fff;
  border-color: rgba(255,82,96,.62);
  background: linear-gradient(180deg, rgba(224,0,18,.92), rgba(128,0,8,.92));
}

.test-tab.advanced-tab:not(.active) {
  border-color: rgba(242,184,75,.28);
  color: #ffd886;
}

.visual-panel {
  padding: 14px;
  overflow: hidden;
}

.visual-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.visual-head h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
  letter-spacing: -.055em;
  color: var(--text, #f2f4f7);
}

.signal-chip,
.test-signal-label {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-soft, #2d333d);
  background: #11151a;
  color: var(--muted, #a5adb8);
  border-radius: 999px;
  padding: 8px 10px;
  font-size: 11px;
  font-weight: 850;
  line-height: 1.25;
}

.speaker-map {
  display: grid;
  grid-template-columns: minmax(100px, 1fr) minmax(120px, .88fr) minmax(100px, 1fr);
  gap: 12px;
  align-items: center;
  min-height: 150px;
  border: 1px solid var(--line-soft, #2d333d);
  border-radius: 18px;
  background:
    radial-gradient(circle at 50% 52%, rgba(224,0,18,.16), transparent 26%),
    linear-gradient(180deg, rgba(17,21,26,.92), rgba(11,13,16,.96));
  padding: 16px;
  position: relative;
}

.speaker-node {
  min-height: 104px;
  border: 1px solid var(--line, #3b4350);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(37,43,53,.95), rgba(19,23,29,.96));
  position: relative;
  display: grid;
  place-items: center;
  box-shadow: var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
  overflow: hidden;
}

.speaker-node::after {
  content: "";
  position: absolute;
  width: 72px;
  height: 72px;
  border: 2px solid rgba(255,255,255,.08);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.08), rgba(0,0,0,.25) 45%, rgba(0,0,0,.35) 70%);
}

.speaker-label {
  position: relative;
  z-index: 2;
  color: var(--text, #f2f4f7);
  font-weight: 1000;
  letter-spacing: .12em;
  font-size: 13px;
  text-shadow: 0 1px 6px rgba(0,0,0,.6);
}

.speaker-cone {
  position: absolute;
  z-index: 1;
  inset: 0;
  background: radial-gradient(circle, rgba(66,211,107,.18), transparent 36%);
  opacity: 0;
  transform: scale(.8);
}

.speaker-node.is-active {
  border-color: rgba(66,211,107,.72);
  box-shadow: 0 0 22px rgba(66,211,107,.12), var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
}

.speaker-node.is-active .speaker-cone {
  opacity: .95;
  animation: speakerPulse .75s ease-in-out infinite alternate;
}

.speaker-node.is-inverted {
  border-color: rgba(104,216,255,.72);
}

.speaker-node.is-inverted .speaker-cone {
  background: radial-gradient(circle, rgba(104,216,255,.22), transparent 36%);
  animation-direction: alternate-reverse;
}

.center-stage {
  display: grid;
  place-items: center;
  gap: 8px;
  min-height: 110px;
}

.center-dot {
  width: 74px;
  height: 74px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.12);
  background: radial-gradient(circle, rgba(255,255,255,.2), rgba(224,0,18,.55) 30%, rgba(224,0,18,.1) 62%, transparent 66%);
  box-shadow: 0 0 34px rgba(224,0,18,.25);
  opacity: .5;
  transition: opacity .18s ease, transform .18s ease, filter .18s ease;
}

.center-dot.is-focused {
  opacity: 1;
  transform: scale(.86);
  filter: saturate(1.2);
}

.center-dot.is-wide {
  opacity: .78;
  transform: scale(1.45, .72);
  filter: hue-rotate(185deg) saturate(.9);
}

.center-label {
  color: var(--muted, #a5adb8);
  font-size: 11px;
  font-weight: 950;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.meter-spectrum-grid {
  display: grid;
  grid-template-columns: minmax(100px, 190px) minmax(0, 1fr);
  gap: 12px;
  margin-top: 12px;
}

.lr-meters {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  border: 1px solid var(--line-soft, #2d333d);
  border-radius: 16px;
  background: #11151a;
  padding: 10px;
}

.meter-block {
  display: grid;
  grid-template-rows: 86px auto;
  gap: 6px;
  justify-items: center;
}

.meter-track {
  width: 100%;
  max-width: 42px;
  height: 86px;
  border: 1px solid var(--line-soft, #2d333d);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(224,0,18,.16), rgba(66,211,107,.1));
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: flex-end;
}

.meter-track span {
  display: block;
  width: 100%;
  background: linear-gradient(180deg, var(--system-amber), var(--system-green));
  border-radius: 999px;
  transition: height .08s linear;
}

.meter-block strong {
  color: var(--text, #f2f4f7);
  font-weight: 1000;
  letter-spacing: .14em;
}

.spectrum-wrap {
  border: 1px solid var(--line-soft, #2d333d);
  background: #11151a;
  border-radius: 16px;
  padding: 10px;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 8px;
  min-height: 112px;
}

.spectrum-labels,
.spectrum-bars {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 6px;
}

.spectrum-labels span {
  color: var(--dim, #747d8a);
  font-size: 10px;
  font-weight: 850;
  text-align: center;
}

.spectrum-bars {
  align-items: end;
  height: 76px;
}

.spectrum-bars span {
  min-height: 4px;
  height: 8%;
  border-radius: 5px 5px 2px 2px;
  background: linear-gradient(180deg, rgba(255,216,134,.95), rgba(66,211,107,.86));
  opacity: .74;
  transition: height .08s linear, opacity .15s ease;
}

.spectrum-bars span.is-emphasis {
  opacity: 1;
  box-shadow: 0 0 12px rgba(66,211,107,.18);
}

.visual-note {
  margin: 9px 0 0;
  color: var(--dim, #747d8a);
  font-size: 11px;
  line-height: 1.4;
}

.test-panels {
  display: grid;
  gap: 12px;
}

.test-panel {
  border: 1px solid var(--line, #3b4350);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(31,36,44,.94), rgba(21,24,29,.96));
  box-shadow: var(--shadow, 0 18px 60px rgba(0,0,0,.42)), var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
  padding: 14px;
}

.test-card-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 12px;
}

.test-card-head h2 {
  margin: 0;
  color: var(--text, #f2f4f7);
  font-size: clamp(25px, 3.5vw, 42px);
  line-height: .96;
  letter-spacing: -.066em;
}

.test-card-head p {
  margin: 7px 0 0;
  color: var(--muted, #a5adb8);
  line-height: 1.48;
  font-size: 14px;
  max-width: 730px;
}

.action-grid {
  display: grid;
  gap: 8px;
  margin-bottom: 8px;
}

.two-actions { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.three-actions { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.action-button {
  width: 100%;
  min-height: 68px;
  border: 1px solid #ff5260;
  border-radius: 16px;
  background: linear-gradient(180deg, var(--system-accent-2), #850008);
  color: #fff;
  font-weight: 1000;
  font-size: clamp(16px, 2.8vw, 22px);
  letter-spacing: .04em;
  cursor: pointer;
  box-shadow: var(--inset, inset 0 1px 0 rgba(255,255,255,.05)), 0 12px 30px rgba(224,0,18,.18);
}

.action-button.secondary {
  border-color: rgba(66,211,107,.42);
  background: linear-gradient(180deg, rgba(38,90,52,.98), rgba(22,51,31,.98));
  color: #dfffe6;
  box-shadow: var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
}

.action-button.invert {
  border-color: rgba(104,216,255,.48);
  background: linear-gradient(180deg, rgba(45,87,105,.98), rgba(22,45,58,.98));
  color: #e3f8ff;
}

.action-button.wide {
  margin-bottom: 8px;
}

.band-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 8px;
}

.band-button {
  min-height: 46px;
  border: 1px solid var(--line, #3b4350);
  border-radius: 13px;
  background: #11151a;
  color: var(--muted, #a5adb8);
  font-weight: 950;
  cursor: pointer;
}

.band-button.active {
  color: #fff;
  border-color: rgba(66,211,107,.62);
  background: linear-gradient(180deg, rgba(48,106,64,.98), rgba(24,54,34,.98));
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.guide-grid section {
  border: 1px solid var(--line-soft, #2d333d);
  border-radius: 14px;
  background: #11151a;
  padding: 11px;
}

.guide-grid h3 {
  margin: 0 0 6px;
  color: var(--text, #f2f4f7);
  font-size: 13px;
  letter-spacing: -.02em;
}

.guide-grid p {
  margin: 0;
  color: var(--muted, #a5adb8);
  font-size: 12.5px;
  line-height: 1.48;
}

.rattle-readout {
  border: 1px solid var(--line-soft, #2d333d);
  background:
    radial-gradient(circle at 24% 55%, rgba(242,184,75,.14), transparent 45%),
    #11151a;
  border-radius: 16px;
  padding: 14px;
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.rattle-readout span {
  color: var(--muted, #a5adb8);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.rattle-readout strong {
  color: var(--text, #f2f4f7);
  font-size: clamp(34px, 5vw, 56px);
  line-height: .88;
  letter-spacing: -.06em;
}

.system-notes {
  padding: 0;
  overflow: hidden;
}

.system-notes summary {
  cursor: pointer;
  list-style: none;
  padding: 14px;
  color: var(--text, #f2f4f7);
  font-weight: 950;
}

.system-notes summary::-webkit-details-marker { display: none; }

.notes-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  border-top: 1px solid var(--line-soft, #2d333d);
  padding: 14px;
}

.notes-grid div,
.seo-box {
  border: 1px solid var(--line-soft, #2d333d);
  background: #11151a;
  border-radius: 14px;
  padding: 11px;
}

.notes-grid strong,
.seo-box strong {
  display: block;
  color: var(--text, #f2f4f7);
  margin-bottom: 5px;
}

.notes-grid p,
.seo-section p,
.seo-box {
  color: var(--muted, #a5adb8);
  line-height: 1.5;
  font-size: 13px;
}

.seo-section h2 {
  margin: 0 0 8px;
  color: var(--text, #f2f4f7);
  letter-spacing: -.04em;
}

.seo-section p { margin: 0; }

.seo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

@keyframes speakerPulse {
  from { transform: scale(.82); opacity: .45; }
  to { transform: scale(1.08); opacity: 1; }
}

@media (max-width: 960px) {
  .page-intro,
  .master-control,
  .meter-spectrum-grid {
    grid-template-columns: 1fr;
  }

  .stop-button {
    width: 100%;
  }

  .test-tabs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .guide-grid,
  .notes-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .system-check-shell {
    gap: 10px;
  }

  .test-tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 7px;
  }

  .test-tab {
    min-height: 52px;
    font-size: 13px;
  }

  .visual-head,
  .test-card-head {
    display: grid;
  }

  .speaker-map {
    grid-template-columns: 1fr;
    gap: 8px;
    min-height: 0;
  }

  .speaker-node {
    min-height: 82px;
  }

  .center-stage {
    min-height: 70px;
    order: 2;
  }

  .right-speaker { order: 3; }

  .two-actions,
  .three-actions,
  .band-row,
  .guide-grid,
  .notes-grid,
  .seo-grid {
    grid-template-columns: 1fr;
  }

  .action-button {
    min-height: 60px;
  }

  .lr-meters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .meter-block {
    grid-template-rows: 62px auto;
  }

  .meter-track {
    height: 62px;
    max-width: 68px;
  }
}

/* V112 function + density pass */
.page-intro {
  grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  gap: 14px;
  align-items: center;
  padding-top: 18px;
  padding-bottom: 18px;
}

.system-title {
  font-size: clamp(32px, 4.6vw, 54px);
}

.system-sub {
  margin-top: 8px;
  line-height: 1.42;
}

.master-control {
  padding: 10px;
  grid-template-columns: minmax(190px, .44fr) minmax(0, 1fr) auto;
  gap: 10px;
}

.master-volume {
  padding: 9px 10px;
}

.master-status {
  min-height: 50px;
  padding: 8px 10px;
}

.stop-button {
  min-height: 50px;
  min-width: 104px;
}

.test-tabs {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 7px;
}

.test-tab {
  min-height: 50px;
  border-radius: 13px;
  padding: 8px;
}

.test-panel {
  padding: 12px;
  border-radius: 17px;
}

.test-card-head {
  margin-bottom: 9px;
}

.test-card-head h2 {
  font-size: clamp(24px, 3.1vw, 36px);
}

.test-card-head p {
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.42;
}

.action-button {
  min-height: 56px;
  border-radius: 14px;
  font-size: clamp(14px, 2vw, 19px);
}

.action-button.wide {
  margin-bottom: 7px;
}

.band-row,
.action-grid,
.rattle-step-row,
.rattle-speed {
  gap: 7px;
}

.priority-note,
.result-hint {
  border: 1px solid rgba(242,184,75,.32);
  background: rgba(242,184,75,.08);
  color: #ffd886;
  border-radius: 13px;
  padding: 9px 10px;
  font-size: 12.5px;
  line-height: 1.45;
  font-weight: 850;
  margin-bottom: 8px;
}

.result-hint {
  border-color: rgba(104,216,255,.28);
  background: rgba(104,216,255,.07);
  color: #d8f6ff;
}

.polarity-actions .action-button {
  letter-spacing: .015em;
}

.rattle-speed {
  display: grid;
  grid-template-columns: minmax(110px, .8fr) repeat(3, minmax(0, 1fr));
  align-items: center;
  margin-bottom: 8px;
}

.rattle-speed > span {
  color: var(--muted, #a5adb8);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.rattle-step-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 8px;
}

.small-action {
  min-height: 42px;
  border: 1px solid var(--line, #3b4350);
  border-radius: 12px;
  background: #11151a;
  color: var(--text, #f2f4f7);
  font-weight: 950;
  cursor: pointer;
}

.small-action:hover,
.band-button:hover,
.test-tab:hover,
.action-button:hover {
  filter: brightness(1.06);
}

.rattle-readout {
  padding: 10px 12px;
}

.rattle-readout strong {
  font-size: clamp(28px, 4vw, 44px);
}

.visual-panel {
  padding: 12px;
}

.visual-head {
  margin-bottom: 8px;
}

.visual-head h2 {
  font-size: clamp(20px, 2.6vw, 28px);
}

.speaker-map {
  min-height: 118px;
  padding: 12px;
  gap: 10px;
  border-radius: 16px;
}

.speaker-node {
  min-height: 78px;
  border-radius: 15px;
}

.speaker-node::after {
  width: 58px;
  height: 58px;
}

.center-stage {
  min-height: 82px;
}

.center-dot {
  width: 58px;
  height: 58px;
}

.meter-spectrum-grid {
  margin-top: 8px;
  grid-template-columns: minmax(92px, 150px) minmax(0, 1fr);
  gap: 8px;
}

.lr-meters,
.spectrum-wrap {
  padding: 8px;
  border-radius: 14px;
}

.meter-block {
  grid-template-rows: 58px auto;
}

.meter-track {
  height: 58px;
  max-width: 34px;
}

.spectrum-wrap {
  min-height: 84px;
  gap: 5px;
}

.spectrum-bars {
  height: 50px;
}

.visual-note {
  margin-top: 6px;
}

.guide-grid {
  margin-top: 9px;
}

.guide-grid section {
  padding: 9px;
}

.guide-grid h3 {
  margin-bottom: 4px;
}

.guide-grid p {
  line-height: 1.42;
}

@media (max-width: 960px) {
  .test-tabs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .page-intro,
  .master-control,
  .meter-spectrum-grid,
  .test-card-head,
  .visual-head {
    grid-template-columns: 1fr;
  }

  .test-tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .three-actions,
  .polarity-actions,
  .rattle-speed,
  .rattle-step-row {
    grid-template-columns: 1fr;
  }

  .speaker-node {
    min-height: 70px;
  }
}

/* V113 layout workbench pass: PC uses the width, not only vertical compression */
.test-workbench {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(360px, .86fr);
  gap: 10px;
  align-items: start;
}

.test-workbench .test-panels {
  min-width: 0;
}

.test-workbench .visual-panel {
  min-width: 0;
  align-self: start;
  position: sticky;
  top: 10px;
}

.test-workbench .visual-head {
  margin-bottom: 7px;
  align-items: center;
}

.test-workbench .visual-head h2 {
  font-size: clamp(19px, 2vw, 25px);
}

.test-workbench .signal-chip {
  max-width: 240px;
  white-space: normal;
  padding: 6px 9px;
  font-size: 10px;
}

.test-workbench .speaker-map {
  min-height: 96px;
  padding: 9px;
  grid-template-columns: minmax(84px, 1fr) minmax(70px, .55fr) minmax(84px, 1fr);
  gap: 8px;
}

.test-workbench .speaker-node {
  min-height: 66px;
}

.test-workbench .speaker-node::after {
  width: 48px;
  height: 48px;
}

.test-workbench .speaker-label {
  font-size: 11px;
}

.test-workbench .center-stage {
  min-height: 66px;
  gap: 5px;
}

.test-workbench .center-dot {
  width: 44px;
  height: 44px;
}

.test-workbench .meter-spectrum-grid {
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 7px;
  margin-top: 7px;
}

.test-workbench .lr-meters,
.test-workbench .spectrum-wrap {
  padding: 7px;
}

.test-workbench .meter-block {
  grid-template-rows: 46px auto;
}

.test-workbench .meter-track {
  height: 46px;
  max-width: 30px;
}

.test-workbench .spectrum-wrap {
  min-height: 68px;
}

.test-workbench .spectrum-labels span {
  font-size: 9px;
}

.test-workbench .spectrum-bars {
  height: 38px;
}

.test-workbench .visual-note {
  font-size: 10px;
  margin-top: 5px;
}

/* Keep the active test compact enough that controls and monitor fit together. */
.test-workbench .test-panel {
  padding: 11px;
}

.test-workbench .test-card-head {
  margin-bottom: 7px;
}

.test-workbench .test-card-head h2 {
  font-size: clamp(22px, 2.4vw, 32px);
}

.test-workbench .test-card-head p {
  font-size: 12.5px;
  line-height: 1.34;
}

.test-workbench .test-signal-label {
  padding: 6px 8px;
  font-size: 10px;
  max-width: 220px;
  white-space: normal;
}

.test-workbench .action-button {
  min-height: 48px;
  font-size: clamp(13px, 1.5vw, 17px);
  border-radius: 12px;
}

.test-workbench .band-button {
  min-height: 38px;
  border-radius: 11px;
}

.test-workbench .guide-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
  margin-top: 8px;
}

.test-workbench .guide-grid section {
  padding: 8px;
}

.test-workbench .guide-grid h3 {
  font-size: 12px;
  margin-bottom: 3px;
}

.test-workbench .guide-grid p {
  font-size: 11.5px;
  line-height: 1.34;
}

/* Make polarity state visible inside the test itself, not only in the top status bar. */
.polarity-actions .action-button {
  position: relative;
  padding-top: 20px;
}

.polarity-actions .action-button.is-current {
  outline: 2px solid #fff;
  outline-offset: -3px;
  box-shadow: 0 0 0 3px rgba(255,255,255,.12), 0 0 28px rgba(255,82,96,.22), var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
  filter: brightness(1.15);
}

.polarity-actions .action-button.is-current::before {
  content: "ACTIVE NOW";
  position: absolute;
  top: 5px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  background: rgba(0,0,0,.32);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 9px;
  font-weight: 1000;
  letter-spacing: .08em;
  white-space: nowrap;
}

/* Rattle fine controls must read as controls, not guide text. */
.rattle-step-row {
  grid-template-columns: minmax(150px, .75fr) repeat(4, minmax(0, 1fr));
  align-items: center;
}

.rattle-step-label {
  color: #ffd886;
  font-size: 11px;
  font-weight: 1000;
  letter-spacing: .07em;
  text-transform: uppercase;
}

.small-action {
  min-height: 46px;
  border-color: rgba(242,184,75,.52);
  background: linear-gradient(180deg, rgba(74,54,24,.98), rgba(32,27,19,.98));
  color: #ffe0a0;
  border-radius: 13px;
  font-size: 14px;
  box-shadow: var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
}

.small-action:active {
  transform: translateY(1px);
}

@media (min-width: 961px) {
  .page-intro {
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .system-title {
    font-size: clamp(30px, 4vw, 48px);
  }

  .system-sub {
    font-size: 13px;
    line-height: 1.35;
  }

  .warning {
    padding: 8px 10px;
    font-size: 11px;
  }

  .master-control {
    padding: 8px;
  }

  .master-status,
  .stop-button {
    min-height: 44px;
  }

  .master-status {
    font-size: 12px;
  }

  .master-status strong {
    font-size: 13px;
  }

  .test-tab {
    min-height: 44px;
  }
}

@media (max-width: 960px) {
  .test-workbench {
    grid-template-columns: 1fr;
  }

  .test-workbench .visual-panel {
    position: static;
  }

  .test-workbench .guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .test-workbench .guide-grid,
  .rattle-step-row {
    grid-template-columns: 1fr;
  }

  .test-workbench .speaker-map {
    grid-template-columns: 1fr;
  }
}


/* V114 header quick channel + grouped one-line controls pass */
@media (min-width: 961px) {
  .page-intro {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
    align-items: stretch;
  }
}

.intro-side {
  display: grid;
  gap: 8px;
  align-content: center;
}

.quick-channel-card {
  border: 1px solid rgba(66, 211, 107, .26);
  background:
    radial-gradient(circle at 14% 18%, rgba(66,211,107,.14), transparent 42%),
    linear-gradient(180deg, rgba(20,28,31,.96), rgba(13,17,22,.96));
  border-radius: 14px;
  padding: 11px;
  box-shadow: var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
}

.quick-channel-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 8px;
}

.quick-label {
  display: block;
  color: var(--system-green);
  font-size: 10px;
  line-height: 1.1;
  font-weight: 1000;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 3px;
}

.quick-channel-head strong {
  display: block;
  color: var(--text, #f2f4f7);
  font-size: 15px;
  letter-spacing: -.025em;
}

.quick-safety {
  flex: 0 0 auto;
  border: 1px solid rgba(242,184,75,.35);
  background: rgba(242,184,75,.09);
  color: #ffd886;
  border-radius: 999px;
  padding: 4px 8px;
  font-size: 10px;
  font-weight: 1000;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.quick-channel-actions {
  display: grid;
  grid-template-columns: 1.45fr .8fr .8fr;
  gap: 7px;
}

.quick-channel-button {
  min-height: 38px;
  border: 1px solid rgba(66,211,107,.36);
  border-radius: 11px;
  background: linear-gradient(180deg, rgba(36,76,48,.98), rgba(18,38,27,.98));
  color: #e7ffed;
  font-weight: 1000;
  font-size: 12px;
  letter-spacing: .04em;
  cursor: pointer;
  box-shadow: var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
}

.quick-channel-button.primary {
  border-color: rgba(255,82,96,.62);
  background: linear-gradient(180deg, rgba(224,0,18,.95), rgba(128,0,8,.95));
  color: #fff;
}

.quick-channel-card p {
  margin: 7px 0 0;
  color: var(--muted, #a5adb8);
  font-size: 11px;
  line-height: 1.32;
}

@media (min-width: 961px) {
  .test-tabs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .test-workbench {
    grid-template-columns: minmax(0, 1.34fr) minmax(310px, .72fr);
    gap: 10px;
  }

  .test-workbench .visual-panel {
    padding: 10px;
  }

  .test-workbench .test-panel {
    padding: 10px;
  }

  .test-workbench .guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.control-row {
  display: flex;
  align-items: stretch;
  gap: 10px;
  margin: 8px 0;
  min-width: 0;
}

.control-group {
  display: flex;
  align-items: stretch;
  gap: 6px;
  min-width: 0;
  border: 1px solid rgba(59,67,80,.62);
  background: rgba(0,0,0,.14);
  border-radius: 14px;
  padding: 6px;
}

.control-label {
  flex: 0 0 auto;
  align-self: center;
  color: var(--muted, #a5adb8);
  font-size: 10px;
  font-weight: 1000;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 0 3px 0 2px;
  writing-mode: horizontal-tb;
}

.amber-label {
  color: #ffd886;
}

.primary-group,
.mode-group,
.band-group,
.speed-group,
.run-group,
.fine-group {
  flex: 1 1 auto;
}

.compare-group {
  flex: .58 0 auto;
}

.center-play-group,
.center-focus-group {
  flex: 1.2 1 300px;
}

.center-noise-group {
  flex: .65 1 220px;
}

.control-group .action-button,
.control-group .band-button,
.control-group .small-action {
  min-height: 40px;
  border-radius: 11px;
  font-size: 12px;
  white-space: nowrap;
}

.control-group .action-button {
  min-width: 116px;
  padding-left: 10px;
  padding-right: 10px;
}

.control-group .primary-action {
  min-width: 260px;
  font-size: 15px;
}

.control-group .compact-action {
  min-width: 122px;
}

.control-group .auto-action {
  min-width: 135px;
}

.control-group .band-button {
  min-width: 70px;
  padding-left: 10px;
  padding-right: 10px;
}

.control-group .small-action {
  min-width: 64px;
  padding-left: 9px;
  padding-right: 9px;
}

.polarity-control-row .mode-group {
  flex: 1 1 auto;
}

.speaker-match-control-row .band-group {
  flex: 1.05 1 auto;
}

.rattle-speed-row {
  margin-top: 6px;
  margin-bottom: 6px;
}

.rattle-speed-row .speed-group {
  flex: 1 1 100%;
}

.rattle-control-row .run-group {
  flex: .9 1 auto;
}

.rattle-control-row .fine-group {
  flex: 1.1 1 auto;
}

.compact-readout {
  margin-bottom: 6px;
}

.test-workbench .rattle-readout.compact-readout {
  padding: 8px 10px;
}

.test-workbench .rattle-readout.compact-readout strong {
  font-size: clamp(24px, 3.2vw, 36px);
}

/* Older V113 row styles are superseded by grouped V114 controls. */
.test-panel .rattle-speed,
.test-panel .rattle-step-row {
  display: none;
}

.test-panel .control-row .rattle-speed,
.test-panel .control-row .rattle-step-row {
  display: flex;
}

.polarity-actions .action-button.is-current::before {
  content: "ACTIVE";
}

@media (max-width: 1100px) and (min-width: 961px) {
  .control-row {
    flex-wrap: wrap;
  }

  .compare-group,
  .primary-group,
  .mode-group,
  .band-group,
  .speed-group,
  .run-group,
  .fine-group {
    flex: 1 1 100%;
  }
}

@media (max-width: 960px) {
  .intro-side {
    align-content: stretch;
  }

  .quick-channel-actions {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .test-tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .control-row {
    flex-wrap: wrap;
  }

  .control-group {
    flex: 1 1 100%;
    flex-wrap: wrap;
  }
}

@media (max-width: 680px) {
  .quick-channel-actions {
    grid-template-columns: 1fr;
  }

  .control-label {
    flex-basis: 100%;
  }

  .control-group .action-button,
  .control-group .band-button,
  .control-group .small-action {
    flex: 1 1 100%;
  }
}

@media (min-width: 1101px) {
  .rattle-control-row .run-group .action-button {
    min-width: 98px;
  }
  .rattle-control-row .fine-group .small-action {
    min-width: 56px;
  }
}


/* V115 header Signal View + restored Channel Check workbench */
@media (min-width: 961px) {
  .page-intro {
    grid-template-columns: minmax(0, 1fr) minmax(390px, 450px);
    align-items: stretch;
    gap: 12px;
  }

  .intro-side {
    align-content: stretch;
  }

  .head-monitor {
    height: 100%;
  }

  .test-tabs {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .test-workbench {
    display: block;
  }

  .test-workbench .test-panels {
    width: 100%;
  }

  .test-workbench .test-panel {
    padding: 10px;
  }

  .test-workbench .guide-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 7px;
  }

  .test-workbench .test-card-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 10px;
  }
}

.head-monitor {
  border: 1px solid rgba(104,216,255,.22);
  background:
    radial-gradient(circle at 78% 12%, rgba(104,216,255,.10), transparent 38%),
    linear-gradient(180deg, rgba(18,23,30,.96), rgba(12,15,20,.96));
  border-radius: 16px;
  padding: 10px;
  box-shadow: var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
}

.head-monitor .visual-head {
  align-items: center;
  margin-bottom: 7px;
}

.head-monitor .panel-kicker {
  font-size: 10px;
  margin-bottom: 2px;
}

.head-monitor .visual-head h2 {
  font-size: clamp(18px, 1.9vw, 24px);
}

.head-monitor .signal-chip {
  max-width: 190px;
  white-space: normal;
  padding: 5px 8px;
  font-size: 9.5px;
}

.head-monitor .speaker-map {
  min-height: 86px;
  padding: 8px;
  grid-template-columns: minmax(78px, 1fr) minmax(62px, .58fr) minmax(78px, 1fr);
  gap: 7px;
  border-radius: 14px;
}

.head-monitor .speaker-node {
  min-height: 58px;
  border-radius: 13px;
}

.head-monitor .speaker-node::after {
  width: 42px;
  height: 42px;
}

.head-monitor .speaker-label {
  font-size: 10px;
}

.head-monitor .center-stage {
  min-height: 58px;
  gap: 4px;
}

.head-monitor .center-dot {
  width: 38px;
  height: 38px;
}

.head-monitor .center-label {
  font-size: 9px;
}

.head-monitor .meter-spectrum-grid {
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 7px;
  margin-top: 7px;
}

.head-monitor .lr-meters,
.head-monitor .spectrum-wrap {
  padding: 7px;
  border-radius: 13px;
}

.head-monitor .meter-block {
  grid-template-rows: 42px auto;
}

.head-monitor .meter-track {
  height: 42px;
  max-width: 28px;
}

.head-monitor .spectrum-wrap {
  min-height: 64px;
}

.head-monitor .spectrum-labels span {
  font-size: 8.5px;
}

.head-monitor .spectrum-bars {
  height: 36px;
}

.head-monitor .visual-note {
  font-size: 9.5px;
  line-height: 1.25;
  margin-top: 5px;
}

.channel-control-row .channel-auto-group {
  flex: .52 0 auto;
}

.channel-control-row .channel-manual-group {
  flex: 1 1 auto;
}

.channel-control-row .primary-action {
  min-width: 150px;
}

.channel-control-row .compact-action {
  min-width: 110px;
}

@media (max-width: 960px) {
  .head-monitor {
    margin-top: 8px;
  }

  .test-tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .head-monitor .speaker-map {
    grid-template-columns: 1fr;
  }

  .head-monitor .meter-spectrum-grid {
    grid-template-columns: 1fr;
  }
}

/* V117 mobile header monitor + compact polarity state polish */
.polarity-actions .action-button {
  padding-top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.polarity-actions .action-button.is-current {
  outline: 2px solid rgba(255,255,255,.78);
  outline-offset: -3px;
  box-shadow: 0 0 0 3px rgba(255,255,255,.10), 0 0 20px rgba(255,82,96,.18), var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
  filter: brightness(1.12);
}

.polarity-actions .action-button.is-current::before {
  content: none !important;
  display: none !important;
}

.polarity-actions .action-button.is-current::after {
  content: "ACTIVE";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 6px;
  border: 1px solid rgba(255,255,255,.24);
  border-radius: 999px;
  background: rgba(0,0,0,.24);
  color: #fff;
  font-size: 8px;
  line-height: 1;
  font-weight: 1000;
  letter-spacing: .08em;
}

@media (max-width: 680px) {
  .head-monitor .speaker-map {
    grid-template-columns: minmax(0, 1fr) minmax(42px, .52fr) minmax(0, 1fr);
    gap: 6px;
    min-height: 82px;
    padding: 8px;
  }

  .head-monitor .speaker-node,
  .head-monitor .center-stage {
    min-height: 56px;
    order: initial;
  }

  .head-monitor .right-speaker {
    order: initial;
  }

  .head-monitor .speaker-node {
    border-radius: 12px;
  }

  .head-monitor .speaker-node::after {
    width: 34px;
    height: 34px;
  }

  .head-monitor .speaker-label {
    font-size: 8.5px;
  }

  .head-monitor .center-dot {
    width: 32px;
    height: 32px;
  }

  .head-monitor .center-label {
    font-size: 7.5px;
    letter-spacing: .06em;
  }

  .head-monitor .visual-head {
    display: grid;
    gap: 6px;
  }

  .head-monitor .signal-chip {
    max-width: 100%;
  }
}


/* V119 final polish: compact field guide, cleaner active state, unified match speed, inline rattle Hz */
.field-guide {
  padding: 12px 14px;
}

.field-guide-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 9px;
}

.field-guide-head h2 {
  margin: 0;
  color: var(--text, #f2f4f7);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1;
  letter-spacing: -.045em;
}

.field-guide-head p {
  margin: 0;
  color: var(--muted, #a5adb8);
  font-size: 12px;
  line-height: 1.35;
  max-width: 480px;
}

.field-guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.field-card {
  border: 1px solid var(--line-soft, #2d333d);
  border-radius: 14px;
  background: #11151a;
  overflow: hidden;
}

.field-card summary {
  cursor: pointer;
  list-style: none;
  min-height: 78px;
  padding: 10px 12px;
  display: grid;
  gap: 5px;
}

.field-card summary::-webkit-details-marker { display: none; }

.field-card summary::after {
  content: "+";
  position: absolute;
  right: 12px;
  top: 10px;
  color: var(--system-green);
  font-weight: 1000;
}

.field-card[open] summary::after { content: "−"; }

.field-card summary {
  position: relative;
}

.field-card summary strong {
  color: var(--text, #f2f4f7);
  font-size: 13px;
  letter-spacing: -.015em;
  padding-right: 18px;
}

.field-card summary span {
  color: var(--muted, #a5adb8);
  font-size: 12px;
  line-height: 1.34;
  padding-right: 10px;
}

.field-card p {
  border-top: 1px solid rgba(45,51,61,.75);
  margin: 0;
  padding: 9px 12px 11px;
  color: var(--muted, #a5adb8);
  font-size: 12px;
  line-height: 1.42;
}

.polarity-current {
  border: 1px solid rgba(104,216,255,.24);
  background: rgba(104,216,255,.06);
  color: #d8f6ff;
  border-radius: 12px;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 900;
  margin: -2px 0 8px;
}

.polarity-actions .action-button {
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

.polarity-actions .action-button.is-current::before,
.polarity-actions .action-button.is-current::after {
  content: none !important;
  display: none !important;
}

.polarity-actions .action-button.is-current {
  outline: 2px solid rgba(255,255,255,.78);
  outline-offset: -3px;
  box-shadow: 0 0 0 3px rgba(255,255,255,.10), 0 0 18px rgba(255,82,96,.17), var(--inset, inset 0 1px 0 rgba(255,255,255,.05));
}

.speaker-match-control-row .match-speed-group {
  flex: .42 0 auto;
}

.speaker-match-control-row .match-start-group {
  flex: .48 0 auto;
}

.speaker-match-control-row .match-start-group .action-button {
  min-width: 160px;
}

.rattle-title {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.rattle-hz-pill {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  min-width: 96px;
  padding: 7px 12px 6px;
  border: 1px solid rgba(242,184,75,.35);
  border-radius: 13px;
  background:
    radial-gradient(circle at 25% 40%, rgba(242,184,75,.13), transparent 48%),
    #101216;
  color: #ffe0a0;
  font-size: clamp(21px, 2.1vw, 30px);
  line-height: .9;
  letter-spacing: -.035em;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.05);
}

.rattle-hz-pill::after {
  content: "";
}

.rattle-hz-pill span {
  color: #fff;
  font-weight: 1000;
}

@media (max-width: 960px) {
  .field-guide-head {
    display: grid;
    gap: 6px;
  }
  .field-guide-grid {
    grid-template-columns: 1fr;
  }
  .field-card summary {
    min-height: auto;
  }
  .speaker-match-control-row .match-speed-group,
  .speaker-match-control-row .match-start-group {
    flex: 1 1 100%;
  }
}

/* V120 header guide relocation: put the quick troubleshooting guide inside the hero panel */
.intro-guide {
  margin-top: 12px;
  border: 1px solid rgba(45, 51, 61, .88);
  border-radius: 16px;
  background:
    radial-gradient(circle at 10% 0%, rgba(66,211,107,.07), transparent 38%),
    rgba(11, 14, 18, .68);
  padding: 10px;
}

.intro-guide-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 7px;
}

.intro-guide-head .panel-kicker {
  margin: 0;
  color: var(--system-green, #42d36b);
  font-size: 10px;
  letter-spacing: .11em;
}

.intro-guide-head span:last-child {
  color: var(--muted, #a5adb8);
  font-size: 11px;
  font-weight: 850;
}

.intro-guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 7px;
}

.intro-guide-card {
  border-radius: 12px;
  background: rgba(17, 21, 26, .88);
}

.intro-guide-card summary {
  min-height: 0;
  padding: 8px 10px;
  gap: 4px;
}

.intro-guide-card summary strong {
  font-size: 12px;
  padding-right: 16px;
}

.intro-guide-card summary span {
  font-size: 11px;
  line-height: 1.3;
  padding-right: 5px;
}

.intro-guide-card summary::after {
  right: 9px;
  top: 7px;
}

.intro-guide-card p {
  padding: 8px 10px 9px;
  font-size: 11px;
  line-height: 1.38;
}

/* The standalone field guide section was moved into the hero; keep styles for safety but hide if legacy markup remains. */
section.field-guide {
  display: none;
}

@media (max-width: 960px) {
  .intro-guide {
    margin-top: 10px;
  }
  .intro-guide-grid {
    grid-template-columns: 1fr;
  }
  .intro-guide-card summary {
    min-height: auto;
  }
}


/* Browser translation seed area for dynamic guidance text.
   Keep this text in the DOM so Chrome and Edge can translate it before JavaScript reuses it. */
.translation-seed-area {
  position: fixed;
  left: 0;
  top: 0;
  width: 1px;
  min-height: 1px;
  opacity: 0.01;
  pointer-events: none;
  overflow: visible;
  z-index: -1;
  font-size: 1px;
  line-height: 1;
  color: transparent;
}

.translation-seed-area p {
  display: block;
  margin: 0;
  padding: 0;
  width: 1px;
  max-width: none;
  white-space: normal;
}


/* V181 Center Focus pass */
.center-noise-group .action-button {
  min-width: 220px;
}

@media (max-width: 720px) {
  .center-focus-group,
  .center-noise-group {
    flex: 1 1 100%;
  }

  .center-noise-group .action-button {
    min-width: 100%;
  }
}