/* SolAudioLab Tone Generator V6.8.3 render-balanced layout, fine control and translation polish */
.tone-shell {
  width: min(1180px, 100%);
  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, 380px);
  gap: 16px;
  align-items: end;
}

.tagline {
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

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

.tone-sub {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 14px;
  max-width: 730px;
}

.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: 800;
}

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

.tone-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, .88fr);
  gap: 12px;
  align-items: start;
}

.control-panel,
.sub-panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(31,36,44,0.94), rgba(21,24,29,0.96));
  box-shadow: var(--shadow), var(--inset);
  padding: 14px;
  overflow: hidden;
  min-width: 0;
}

.sub-panel {
  background: #11151a;
  box-shadow: none;
}

.panel-title {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.frequency-display {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: stretch;
  border: 1px solid var(--line-soft);
  border-radius: 15px;
  background:
    radial-gradient(circle at 18% 50%, rgba(224,0,18,0.14), transparent 42%),
    radial-gradient(circle at 70% 65%, rgba(66,211,107,0.08), transparent 42%),
    #11151a;
  padding: 12px;
}

.display-label {
  color: var(--dim);
  font-size: 10px;
  font-weight: 950;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.freq-number {
  color: var(--text);
  font-size: clamp(50px, 7vw, 82px);
  line-height: .82;
  letter-spacing: -0.08em;
  font-weight: 1000;
  font-variant-numeric: tabular-nums;
  margin-top: 8px;
}

.freq-number small {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: .12em;
  margin-left: 8px;
  vertical-align: baseline;
}

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

.freq-stats div {
  border: 1px solid var(--line-soft);
  border-radius: 11px;
  background: rgba(0,0,0,0.16);
  padding: 9px;
  min-width: 0;
}

.freq-stats span {
  display: block;
  color: var(--dim);
  font-size: 10px;
  font-weight: 950;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.freq-stats strong {
  display: block;
  color: var(--text);
  font-size: 16px;
  margin-top: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.play-button {
  width: 100%;
  min-height: 74px;
  margin-top: 10px;
  border: 1px solid #ff5260;
  border-radius: 16px;
  background: linear-gradient(180deg, var(--accent-2), #850008);
  color: #fff;
  font-weight: 1000;
  font-size: clamp(22px, 4vw, 34px);
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: var(--inset), 0 12px 34px rgba(224,0,18,0.25);
}

.play-button.playing {
  border-color: #60e280;
  background: linear-gradient(180deg, #45c765, #176b2d);
  box-shadow: var(--inset), 0 12px 34px rgba(66,211,107,0.18);
}

.slider-wrap {
  margin-top: 12px;
  display: grid;
  gap: 7px;
}

.focus-slider {
  border: 1px solid var(--line-soft);
  background: #11151a;
  border-radius: 14px;
  padding: 12px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

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

.freq-control-grid {
  display: grid;
  grid-template-columns: minmax(180px, .72fr) minmax(0, 1fr);
  gap: 8px;
  align-items: end;
  margin-top: 10px;
}

.freq-buttons {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 7px;
}

.copy-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}

.input-row {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  margin-top: 10px;
  min-width: 0;
}

.generator-panel .input-row {
  margin-top: 0;
}

.input-row label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

input,
select,
button {
  max-width: 100%;
  min-width: 0;
}

input[type="number"],
select {
  width: 100%;
  border: 1px solid var(--line);
  background: #11151a;
  color: var(--text);
  border-radius: 10px;
  padding: 9px 10px;
  font: inherit;
  font-weight: 850;
}

.btn {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, #303743, #171b22);
  color: var(--text);
  font-weight: 950;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 10px 10px;
  cursor: pointer;
  box-shadow: var(--inset);
  max-width: 100%;
  min-width: 0;
}

.btn:hover,
.segment button:hover {
  border-color: #ff5260;
}

.btn.small {
  padding: 8px 8px;
  font-size: 12px;
}

.btn.green {
  background: linear-gradient(180deg, #45c765, #176b2d);
  border-color: #60e280;
}

.btn.ghost {
  background: #11151a;
}

.btn.copied {
  border-color: #60e280;
  color: #9bffb3;
}

.segment {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 7px;
}

.segment.three {
  grid-template-columns: repeat(3, 1fr);
}

.segment button {
  border: 1px solid var(--line-soft);
  background: #11151a;
  color: var(--muted);
  border-radius: 12px;
  padding: 9px 7px;
  font-weight: 950;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
}

.segment button.active {
  color: #fff;
  border-color: #ff5260;
  background: linear-gradient(180deg, var(--accent-2), #93000a);
}

.status-line {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
  margin: 10px 0 0;
}

.status-line strong {
  color: var(--text);
}

.more-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0;
}

.more-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 11px;
  margin-top: 11px;
}

.hidden {
  display: none !important;
}

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

.note-grid {
  display: grid;
  grid-template-columns: 1.1fr .8fr 1fr;
  gap: 8px;
}

.mini-table {
  display: grid;
  gap: 7px;
}

.mini-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 106px;
  gap: 8px;
  align-items: center;
  border: 1px solid var(--line-soft);
  border-radius: 11px;
  background: rgba(255,255,255,0.02);
  padding: 8px 9px;
}

.mini-name {
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mini-value {
  color: var(--text);
  font-weight: 950;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.range-card {
  border: 1px solid var(--line-soft);
  background: rgba(255,255,255,0.02);
  border-radius: 12px;
  padding: 9px 10px;
  display: grid;
  grid-template-columns: 102px minmax(0, 1fr);
  gap: 9px;
  align-items: center;
}

.range-card.active {
  border-color: #ff5260;
  box-shadow: 0 0 0 2px rgba(224, 0, 18, 0.12);
}

.range-band {
  color: var(--green);
  font-size: 12px;
  font-weight: 950;
}

.range-desc {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.seo-section {
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.6;
}

.seo-section h2,
.seo-section h3 {
  color: var(--text);
  letter-spacing: -0.045em;
}

@media (max-width: 1080px) {
  .tone-workspace {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .page-intro,
  .more-grid {
    grid-template-columns: 1fr;
  }

  .intro-counter {
    justify-content: flex-start;
  }
}

@media (max-width: 740px) {
  .tone-shell {
    padding-left: 9px;
    padding-right: 9px;
  }

  .frequency-display {
    grid-template-columns: 1fr;
  }

  .freq-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .freq-control-grid {
    grid-template-columns: 1fr;
  }

  .input-row {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .freq-buttons {
    grid-template-columns: repeat(3, 1fr);
  }

  .preset-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .note-grid {
    grid-template-columns: 1fr;
  }

  .freq-number {
    font-size: clamp(48px, 18vw, 78px);
  }
}

@media (max-width: 440px) {
  .tone-title {
    font-size: clamp(32px, 11vw, 46px);
  }

  .segment,
  .segment.three {
    grid-template-columns: 1fr;
  }

  .copy-row {
    grid-template-columns: 1fr;
  }

  .preset-grid,
  .quick-preset-grid,
  .saved-frequency-list {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .mini-row,
  .range-card {
    grid-template-columns: 1fr;
  }

  .mini-value {
    text-align: left;
  }
}/* V6.0.3 waveform button text fit */
.segment button {
  font-size: 11px;
  letter-spacing: 0.015em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding-left: 5px;
  padding-right: 5px;
}

@media (max-width: 440px) {
  .segment button {
    font-size: 12px;
    white-space: normal;
  }
}

/* V6.2.0 mobile-first tone flow */
.tone-app {
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(320px, .97fr);
  gap: 12px;
  align-items: start;
}

.basic-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.live-chip {
  border: 1px solid rgba(126,255,144,0.25);
  background: rgba(126,255,144,0.07);
  color: var(--green);
  border-radius: 999px;
  padding: 6px 9px;
  font-size: 11px;
  font-weight: 1000;
  letter-spacing: .08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.live-chip.playing {
  border-color: rgba(255,82,96,0.42);
  background: rgba(255,82,96,0.11);
  color: #ff9ba4;
}

.play-button {
  background: linear-gradient(180deg, #45c765, #176b2d);
  border-color: #60e280;
}

.play-button.playing {
  border-color: #ff7a84;
  background: linear-gradient(180deg, #ff3040, #8f000a);
  box-shadow: var(--inset), 0 12px 34px rgba(224,0,18,0.25);
}

.basic-control-grid {
  display: grid;
  grid-template-columns: minmax(170px, .74fr) minmax(0, 1fr);
  gap: 10px;
  align-items: end;
  margin-top: 10px;
}

.volume-inline {
  margin-top: 0;
  border: 1px solid var(--line-soft);
  background: #11151a;
  border-radius: 14px;
  padding: 11px 12px;
}

.waveform-row,
.output-row {
  margin-top: 10px;
}

.quick-presets {
  margin-top: 10px;
  border: 1px solid var(--line-soft);
  background: rgba(0,0,0,0.16);
  border-radius: 14px;
  padding: 11px;
}

.quick-preset-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 7px;
  margin-top: 8px;
}

.quick-preset-grid .btn {
  min-height: 44px;
  padding: 8px 6px;
}

.preset-hint {
  color: var(--dim);
  font-size: 10px;
}

.mini-disclosure {
  margin-top: 10px;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  background: #11151a;
  overflow: hidden;
}

.mini-disclosure > summary {
  min-height: 42px;
  cursor: pointer;
  padding: 10px 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .08em;
  text-transform: uppercase;
  list-style: none;
  user-select: none;
}

.mini-disclosure > summary::-webkit-details-marker {
  display: none;
}

.mini-disclosure > summary::after {
  content: "+";
  float: right;
  color: var(--green);
}

.mini-disclosure[open] > summary::after {
  content: "−";
}

.mini-disclosure .freq-control-grid {
  display: grid;
  grid-template-columns: 1fr;
  margin: 0;
  padding: 0 10px 10px;
}

.mini-disclosure .freq-buttons {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.advanced-stack {
  display: grid;
  gap: 10px;
}

.tone-disclosure {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(31,36,44,0.94), rgba(21,24,29,0.96));
  box-shadow: var(--shadow), var(--inset);
  overflow: hidden;
}

.tone-disclosure > summary {
  min-height: 54px;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px;
  user-select: none;
}

.tone-disclosure > summary::-webkit-details-marker {
  display: none;
}

.tone-disclosure > summary span {
  color: var(--text);
  font-size: 13px;
  font-weight: 1000;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.tone-disclosure > summary small {
  color: var(--muted);
  font-size: 11px;
  font-weight: 850;
  text-align: right;
}

.tone-disclosure > summary::after {
  content: "+";
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid rgba(126,255,144,0.25);
  border-radius: 999px;
  color: var(--green);
  font-weight: 1000;
}

.tone-disclosure[open] > summary {
  border-bottom: 1px solid var(--line-soft);
}

.tone-disclosure[open] > summary::after {
  content: "−";
}

.disclosure-body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding: 12px;
}

.disclosure-body.single {
  grid-template-columns: 1fr;
}

.sweep-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
}

.sweep-button {
  margin-top: 10px;
  width: 100%;
  min-height: 46px;
}

.safety-brief {
  border: 1px solid rgba(242,184,75,0.24);
  background: rgba(242,184,75,0.07);
  color: #ffd886;
  border-radius: 12px;
  padding: 9px 10px;
}

.timer-row {
  margin-top: 0;
}

.saved-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 92px;
  gap: 8px;
}

.saved-frequency-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 7px;
  margin-top: 9px;
}

.saved-empty {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.mobile-playbar {
  display: none;
}

@media (min-width: 1081px) {
  .tone-workspace {
    display: none;
  }
}

@media (max-width: 1080px) {
  .tone-app {
    grid-template-columns: 1fr;
  }

  .advanced-stack {
    grid-template-columns: 1fr;
  }

  .disclosure-body {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 740px) {
  .tone-shell {
    padding-left: 8px;
    padding-right: 8px;
    padding-bottom: 86px;
    gap: 10px;
  }

  .page-intro {
    display: block;
    padding: 13px;
  }

  .tagline {
    font-size: 10px;
    margin-bottom: 5px;
  }

  .tone-title {
    font-size: clamp(30px, 10vw, 42px);
  }

  .tone-sub {
    margin-top: 7px;
    font-size: 12.5px;
    line-height: 1.4;
  }

  .warning {
    margin-top: 10px;
    padding: 8px 9px;
    font-size: 11.5px;
    line-height: 1.35;
  }

  .intro-counter {
    display: none;
  }

  .control-panel,
  .sub-panel {
    padding: 12px;
    border-radius: 15px;
  }

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

  .frequency-display {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 10px;
  }

  .freq-number {
    font-size: clamp(46px, 17vw, 70px);
    margin-top: 5px;
  }

  .freq-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .freq-stats div {
    padding: 7px;
  }

  .freq-stats strong {
    font-size: 13px;
  }

  .play-button {
    min-height: 66px;
    margin-top: 8px;
    font-size: 26px;
    border-radius: 15px;
  }

  .focus-slider {
    margin-top: 8px;
    padding: 10px;
  }

  .basic-control-grid {
    grid-template-columns: 1fr;
    gap: 8px;
    margin-top: 8px;
  }

  .input-row {
    grid-template-columns: 1fr;
    gap: 5px;
    margin-top: 8px;
  }

  .input-row label {
    font-size: 10.5px;
  }

  input[type="number"],
  select {
    min-height: 42px;
  }

  .segment,
  .segment.three {
    grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
    gap: 6px;
  }

  .segment.three {
    grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
  }

  .segment button {
    min-height: 42px;
    font-size: 10.5px;
    white-space: nowrap !important;
  }

  .quick-presets {
    margin-top: 8px;
    padding: 9px;
  }

  .quick-preset-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 6px;
  }

  .quick-preset-grid .btn {
    min-height: 42px;
    font-size: 11px;
  }

  .mini-disclosure .freq-buttons {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .copy-row {
    grid-template-columns: 1fr 1fr;
  }

  .tone-disclosure > summary {
    min-height: 50px;
    padding: 12px;
  }

  .tone-disclosure > summary span {
    font-size: 12px;
  }

  .tone-disclosure > summary small {
    max-width: 128px;
    font-size: 10px;
  }

  .disclosure-body,
  .disclosure-body.single {
    grid-template-columns: 1fr;
    gap: 9px;
    padding: 10px;
  }

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

  .sweep-grid {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .range-card {
    grid-template-columns: 1fr;
  }

  .mobile-playbar {
    position: fixed;
    z-index: 50;
    left: 8px;
    right: 8px;
    bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: 16px;
    background: rgba(13,15,19,0.94);
    backdrop-filter: blur(12px);
    box-shadow: 0 14px 38px rgba(0,0,0,0.45), var(--inset);
    padding: 9px 10px;
  }

  .mobile-playbar span {
    display: block;
    color: var(--muted);
    font-size: 10px;
    font-weight: 1000;
    letter-spacing: .1em;
    text-transform: uppercase;
  }

  .mobile-playbar strong {
    display: block;
    margin-top: 2px;
    color: var(--text);
    font-size: 18px;
    line-height: 1;
    font-weight: 1000;
    font-variant-numeric: tabular-nums;
  }

  .mobile-play-button {
    flex: 0 0 112px;
    min-height: 46px;
    border: 1px solid #60e280;
    border-radius: 13px;
    background: linear-gradient(180deg, #45c765, #176b2d);
    color: #fff;
    font-weight: 1000;
    letter-spacing: .08em;
  }

  .mobile-play-button.playing {
    border-color: #ff7a84;
    background: linear-gradient(180deg, #ff3040, #8f000a);
  }
}

@media (max-width: 390px) {
  .quick-preset-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .tone-disclosure > summary small {
    display: none;
  }

  .freq-number {
    font-size: clamp(42px, 16vw, 64px);
  }

  .mobile-play-button {
    flex-basis: 102px;
  }
}


/* V6.3.0 PC layout balance
   Tightens desktop density and reduces the left-column empty-space effect. */
@media (min-width: 1081px) {
  .tone-shell {
    gap: 10px;
  }

  .page-intro {
    padding: 16px 18px;
    gap: 14px;
    align-items: center;
  }

  .tone-title {
    font-size: clamp(36px, 4.3vw, 54px);
  }

  .tone-sub {
    margin-top: 7px;
    line-height: 1.38;
  }

  .warning {
    padding: 8px 10px;
    line-height: 1.35;
  }

  .intro-counter {
    margin-top: 8px;
  }

  .tone-app {
    grid-template-columns: minmax(500px, 1.04fr) minmax(330px, .86fr);
    gap: 10px;
  }

  .control-panel,
  .sub-panel {
    padding: 12px;
    border-radius: 14px;
  }

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

  .frequency-display {
    padding: 10px;
    gap: 10px;
    border-radius: 13px;
  }

  .freq-number {
    font-size: clamp(46px, 5.7vw, 68px);
    margin-top: 5px;
  }

  .freq-stats {
    gap: 6px;
  }

  .freq-stats div {
    padding: 7px 8px;
  }

  .freq-stats strong {
    font-size: 14px;
  }

  .play-button {
    min-height: 60px;
    margin-top: 8px;
    border-radius: 14px;
    font-size: clamp(20px, 2.5vw, 28px);
  }

  .slider-wrap {
    margin-top: 9px;
    gap: 6px;
  }

  .focus-slider {
    padding: 10px;
    border-radius: 12px;
  }

  .basic-control-grid {
    gap: 8px;
  }

  .input-row {
    margin-top: 8px;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 8px;
  }

  input[type="number"],
  select {
    padding: 8px 9px;
  }

  .volume-inline,
  .quick-presets {
    padding: 9px;
    border-radius: 12px;
  }

  .waveform-row,
  .output-row {
    margin-top: 8px;
  }

  .segment button {
    min-height: 34px;
  }

  .quick-preset-grid {
    gap: 5px;
    margin-top: 7px;
  }

  .quick-preset-grid .btn {
    min-height: 36px;
    padding: 6px 5px;
    font-size: 10px;
  }

  .mini-disclosure {
    margin-top: 8px;
    border-radius: 12px;
  }

  .mini-disclosure > summary {
    min-height: 38px;
    padding: 9px 10px;
  }

  .advanced-stack {
    gap: 8px;
  }

  .tone-disclosure {
    border-radius: 14px;
  }

  .tone-disclosure > summary {
    min-height: 46px;
    padding: 11px 12px;
  }

  .disclosure-body {
    gap: 8px;
    padding: 10px;
  }

  .preset-grid {
    gap: 5px;
  }

  .preset-grid .btn,
  .freq-buttons .btn {
    min-height: 34px;
    padding: 6px 5px;
    font-size: 10px;
  }

  .note-grid {
    gap: 6px;
  }

  .range-card {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 7px;
    padding: 7px 8px;
    border-radius: 10px;
  }

  .range-card p {
    line-height: 1.25;
  }

  .sweep-grid {
    gap: 7px;
  }

  .sweep-button {
    min-height: 40px;
    margin-top: 8px;
  }

  .safety-brief {
    padding: 8px 9px;
  }

  .seo-section {
    margin-top: 0;
  }
}

@media (min-width: 1081px) and (max-width: 1180px) {
  .tone-app {
    grid-template-columns: minmax(470px, 1fr) minmax(300px, .82fr);
  }

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

  .disclosure-body {
    grid-template-columns: 1fr;
  }
}


/* V6.4.0 PC balance polish
   Shifts the desktop column split left, keeps secondary right-column panels folded,
   and lets Safety & Tips fill the remaining visual height. */
@media (min-width: 1081px) {
  .tone-app {
    grid-template-columns: minmax(430px, .9fr) minmax(390px, 1.1fr);
    align-items: stretch;
  }

  .basic-panel {
    align-self: start;
  }

  .advanced-stack {
    align-self: stretch;
    display: grid;
    grid-template-rows: auto auto minmax(0, 1fr);
  }

  .tone-disclosure > summary {
    min-height: 44px;
  }

  .tone-disclosure:not([open]) > .disclosure-body,
  .tone-disclosure:not([open]) > *:not(summary) {
    display: none !important;
  }

  .tone-disclosure:not([open]) {
    min-height: 0;
  }

  .tone-disclosure.safety-disclosure,
  .tone-disclosure:last-child {
    min-height: 100%;
  }

  .tone-disclosure.safety-disclosure[open],
  .tone-disclosure:last-child[open] {
    display: flex;
    flex-direction: column;
  }

  .tone-disclosure.safety-disclosure[open] .disclosure-body,
  .tone-disclosure:last-child[open] .disclosure-body {
    flex: 1 1 auto;
    align-content: start;
  }

  .tone-disclosure.safety-disclosure .safety-brief,
  .tone-disclosure:last-child .safety-brief {
    min-height: 150px;
  }
}

@media (min-width: 1081px) and (max-width: 1180px) {
  .tone-app {
    grid-template-columns: minmax(400px, .88fr) minmax(360px, 1.12fr);
  }
}


/* V6.5.0 Tone Generator Safety & Tips content polish */
.safety-tip-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin-top: 10px;
}

.safety-tip-card {
  border: 1px solid rgba(242,184,75,0.18);
  border-radius: 12px;
  background: rgba(0,0,0,0.18);
  padding: 10px;
  min-width: 0;
}

.safety-tip-card strong {
  display: block;
  color: var(--text);
  font-size: 12px;
  font-weight: 1000;
  letter-spacing: .02em;
}

.safety-tip-card span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.42;
}

.tone-use-guide {
  margin-top: 10px;
  border-top: 1px solid var(--line-soft);
  padding-top: 10px;
}

.tone-use-guide h3 {
  margin: 0 0 7px;
  color: var(--text);
  font-size: 13px;
  font-weight: 1000;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.tone-use-guide ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.48;
}

.tone-use-guide li + li {
  margin-top: 5px;
}

.tone-use-guide strong {
  color: #ffd886;
}

@media (max-width: 740px) {
  .safety-tip-grid {
    grid-template-columns: 1fr;
  }
}


/* V6.5.1 Tone Generator compact Safety & Tips balance */
.compact-safety-copy {
  margin-top: 0;
  line-height: 1.38;
}

.safety-tip-grid.compact {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 9px;
}

.safety-tip-grid.compact .safety-tip-card {
  padding: 9px;
}

.safety-tip-grid.compact .safety-tip-card strong {
  font-size: 11.5px;
}

.safety-tip-grid.compact .safety-tip-card span {
  margin-top: 4px;
  font-size: 11.5px;
  line-height: 1.32;
}

.tone-use-guide.compact {
  margin-top: 9px;
  padding-top: 9px;
}

.tone-use-guide.compact h3 {
  margin-bottom: 7px;
  font-size: 12px;
}

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

.tone-guide-grid div {
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  background: rgba(0,0,0,0.16);
  padding: 8px 9px;
  min-width: 0;
}

.tone-guide-grid strong {
  display: block;
  color: #ffd886;
  font-size: 11.5px;
  font-weight: 1000;
}

.tone-guide-grid span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 11.5px;
  line-height: 1.28;
}

@media (max-width: 740px) {
  .safety-tip-grid.compact,
  .tone-guide-grid {
    grid-template-columns: 1fr;
  }
}


/* V6.5.2 Tone Generator Quick Guide spacing fix
   Keep guide title and explanation visually separated even in the compact layout. */
.tone-guide-grid {
  align-items: stretch;
}

.tone-guide-grid > div {
  display: grid;
  grid-template-columns: 1fr;
  align-content: start;
  row-gap: 4px;
}

.tone-guide-grid > div > strong {
  display: block !important;
  margin: 0;
  line-height: 1.15;
}

.tone-guide-grid > div > strong::after {
  content: ":";
}

.tone-guide-grid > div > span {
  display: block !important;
  margin: 0;
  line-height: 1.32;
}


/* SolAudioLab Mobile Alignment V1 - Tone Generator */
@media (max-width: 760px) {
  .tone-shell {
    gap: var(--at-mobile-gap, 10px);
  }

  .page-intro,
  .tone-app,
  .tone-workspace,
  .advanced-stack,
  .frequency-presets,
  .wave-buttons,
  .output-buttons,
  .preset-grid,
  .tone-guide-grid,
  .safety-tip-grid {
    gap: var(--at-mobile-gap-tight, 8px) !important;
  }

  .page-intro,
  .control-panel,
  .sub-panel,
  .tone-disclosure,
  .tone-disclosure > summary,
  .seo-section,
  .safety-tip-card,
  .tone-guide-grid div {
    border-radius: var(--at-mobile-panel-radius, 15px);
    box-sizing: border-box;
  }

  .tone-disclosure > summary,
  .btn {
    min-height: 42px;
  }
}

@media (max-width: 430px) {
  .tone-shell {
    gap: var(--at-mobile-gap, 9px);
  }

  .page-intro,
  .tone-app,
  .tone-workspace,
  .advanced-stack,
  .frequency-presets,
  .wave-buttons,
  .output-buttons,
  .preset-grid,
  .tone-guide-grid,
  .safety-tip-grid {
    gap: 7px !important;
  }

  .page-intro,
  .control-panel,
  .sub-panel,
  .tone-disclosure,
  .tone-disclosure > summary,
  .seo-section,
  .safety-tip-card,
  .tone-guide-grid div {
    border-radius: var(--at-mobile-panel-radius, 14px);
  }
}


/* SolAudioLab Mobile Alignment V2 - Play button height polish */
@media (max-width: 760px) {
  .play-button {
    min-height: 64px;
    margin-top: 8px;
    font-size: clamp(20px, 6vw, 28px);
  }
}

@media (max-width: 430px) {
  .play-button {
    min-height: 58px;
  }
}

/* V6.6.2 Keyboard sweep control
   Adds one compact helper row under the Frequency slider without expanding the
   left panel more than necessary. */
.keyboard-sweep {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 9px;
  min-height: 24px;
  margin-top: 1px;
  color: var(--muted);
  font-size: 10.5px;
  font-weight: 900;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.keyboard-sweep-label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-width: 0;
  white-space: nowrap;
}

.keyboard-sweep kbd {
  display: inline-grid;
  place-items: center;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  background: rgba(0,0,0,0.25);
  color: var(--text);
  font: inherit;
  font-size: 11px;
  line-height: 1;
  box-shadow: var(--inset);
}

.keyboard-sweep-speed {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex: 0 0 auto;
}

.keyboard-sweep-speed button {
  min-height: 24px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: rgba(0,0,0,0.2);
  color: var(--muted);
  padding: 4px 8px;
  font-size: 10px;
  font-weight: 1000;
  letter-spacing: 0.055em;
  text-transform: uppercase;
  cursor: pointer;
}

.keyboard-sweep-speed button.active,
.keyboard-sweep-speed button[aria-pressed="true"] {
  border-color: rgba(126,255,144,0.36);
  background: rgba(126,255,144,0.1);
  color: var(--green);
}

.keyboard-sweep-speed button:focus-visible {
  outline: 2px solid rgba(126,255,144,0.42);
  outline-offset: 2px;
}

@media (min-width: 1081px) {
  .focus-slider {
    gap: 5px;
  }

  .keyboard-sweep {
    min-height: 22px;
  }
}

@media (max-width: 740px) {
  .keyboard-sweep {
    gap: 7px;
    font-size: 10px;
  }

  .keyboard-sweep-speed button {
    padding-left: 7px;
    padding-right: 7px;
  }
}

@media (max-width: 390px) {
  .keyboard-sweep {
    align-items: stretch;
    flex-direction: column;
    gap: 6px;
  }

  .keyboard-sweep-label,
  .keyboard-sweep-speed {
    width: 100%;
    justify-content: space-between;
  }

  .keyboard-sweep-speed {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}



/* V6.6.3 PC-only keyboard sweep
   The keyboard sweep helper is useful on desktop keyboards, but it should not
   take vertical space on mobile touch layouts. */
@media (max-width: 900px) {
  .keyboard-sweep {
    display: none !important;
  }
}

/* Translation seed: keep dynamic explanatory safety text available for browser translation. */
.translation-seed-area {
  position: fixed;
  left: 0;
  top: 0;
  width: 1px;
  height: 1px;
  opacity: 0.01;
  pointer-events: none;
  overflow: hidden;
  z-index: -1;
  font-size: 1px;
  line-height: 1;
}
.translation-seed-area p {
  margin: 0;
  padding: 0;
}

/* V6.8.0 Tone Generator layout and translation-protection polish
   - Moves Fine Control to the right column for better first-load balance.
   - Keeps More Tone Tools focused on Note, Presets and Harmonic Mix.
   - Removes the large Frequency Range Guide from the tool-control area. */
.fine-control-panel .fine-control-note {
  margin: 0 0 9px;
}

.fine-control-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 9px;
  margin-top: 0;
}

.fine-control-grid .freq-buttons {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.fine-control-grid .copy-row {
  margin-top: 0;
}

.more-tools-body {
  grid-template-columns: minmax(230px, .84fr) minmax(260px, 1.16fr);
  align-items: start;
}

.more-tools-body .preset-panel {
  grid-row: span 2;
}

.harmonic-compact {
  align-self: start;
}

.harmonic-compact .slider-wrap {
  margin-top: 0;
}

.harmonic-compact .status-line {
  margin-top: 8px;
}

@media (min-width: 1081px) {
  .tone-app {
    grid-template-columns: minmax(455px, .92fr) minmax(430px, 1.08fr);
    align-items: start;
  }

  .advanced-stack {
    align-self: start;
    display: grid;
    grid-template-rows: none;
    gap: 10px;
  }

  .tone-disclosure.safety-disclosure,
  .tone-disclosure:last-child {
    min-height: 0;
  }

  .tone-disclosure.safety-disclosure[open],
  .tone-disclosure:last-child[open] {
    display: block;
  }

  .tone-disclosure.safety-disclosure[open] .disclosure-body,
  .tone-disclosure:last-child[open] .disclosure-body {
    flex: none;
    align-content: start;
  }

  .fine-control-disclosure .disclosure-body {
    padding-top: 10px;
  }

  .fine-control-grid .freq-buttons .btn {
    min-height: 36px;
  }

  .safety-tip-grid.compact .safety-tip-card span,
  .tone-guide-grid span {
    line-height: 1.34;
  }
}

@media (max-width: 1080px) {
  .more-tools-body {
    grid-template-columns: 1fr;
  }

  .more-tools-body .preset-panel {
    grid-row: auto;
  }
}

@media (max-width: 560px) {
  .fine-control-grid .freq-buttons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* V6.8.1 Tone Generator render-balanced first screen
   Moves Core Presets to the right column so the PC first-load screen locks into
   a cleaner two-column dashboard without opening Safety & Tips by default. */
.quick-presets-panel {
  padding: 12px;
}

.quick-presets-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 9px;
}

.quick-presets-head .panel-title {
  margin: 0;
}

.quick-presets-head span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: .06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.quick-presets-panel .quick-preset-grid {
  margin-top: 0;
}

.basic-panel .safety-brief {
  margin-top: 10px;
}

.safety-disclosure:not([open]) {
  min-height: 0;
}

@media (min-width: 1081px) {
  .tone-app {
    grid-template-columns: minmax(430px, .88fr) minmax(455px, 1.12fr);
    gap: 12px;
  }

  .basic-panel {
    padding-bottom: 12px;
  }

  .advanced-stack {
    gap: 10px;
  }

  .quick-presets-panel .quick-preset-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .quick-presets-panel .btn {
    min-height: 38px;
    padding: 6px 5px;
    font-size: 10px;
  }

  .fine-control-disclosure .disclosure-body {
    padding-bottom: 12px;
  }
}

@media (max-width: 1080px) {
  .quick-presets-panel {
    order: 2;
  }
}

/* V6.8.2 Tone Generator first-screen height lock
   The open Fine Control panel now contains only controls. This keeps the right
   column height close to the Basic Tone panel without opening explanatory tips. */
.compact-fine-control {
  padding: 10px;
}

.compact-fine-control .fine-control-grid {
  gap: 8px;
}

.compact-fine-control .copy-row {
  gap: 8px;
}

@media (min-width: 1081px) {
  .fine-control-disclosure .disclosure-body.single {
    padding: 10px;
  }

  .compact-fine-control .freq-buttons {
    gap: 7px;
  }

  .compact-fine-control .freq-buttons .btn {
    min-height: 34px;
  }

  .compact-fine-control .copy-row .btn {
    min-height: 36px;
  }
}

/* V6.8.3 Mobile order correction for moved Core Presets */
@media (max-width: 1080px) {
  .quick-presets-panel {
    order: 0;
  }
}