.tone-page {
    overflow-x: hidden;
}

.tone-generator-page {
    --tone-panel: color-mix(in srgb, var(--color-surface-elevated) 82%, var(--color-background));
    --tone-panel-quiet: color-mix(in srgb, var(--color-surface) 90%, var(--color-background));
    --tone-control: color-mix(in srgb, var(--color-background) 56%, var(--color-surface));
    --tone-line: color-mix(in srgb, var(--color-border) 86%, var(--color-cyan));
    background:
        radial-gradient(circle at 50% 9rem, rgb(52 214 255 / 0.055), transparent 27rem),
        var(--color-background);
}

.tone-hero {
    padding-block: clamp(1.75rem, 4vw, 3.5rem) var(--space-6);
    text-align: center;
}

.tone-hero__inner {
    display: grid;
    justify-items: center;
    gap: var(--space-3);
}

.tone-hero__eyebrow,
.tone-console__kicker,
.tone-workspace__label,
.tone-section-heading__label {
    color: var(--color-mint);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

.tone-hero h1 {
    max-width: 24ch;
    font-size: clamp(2.15rem, 4.5vw, 4.1rem);
}

.tone-hero__support {
    max-width: 75ch;
    color: var(--color-text-secondary);
    font-size: var(--text-base);
    line-height: 1.6;
}

.tone-primary {
    padding-block-end: var(--space-8);
}

.tone-console,
.tone-workspace {
    border: 1px solid var(--tone-line);
    border-radius: var(--radius-xl);
    background: var(--tone-panel);
    box-shadow: var(--shadow-elevated);
}

.tone-console {
    overflow: hidden;
}

.tone-console__header,
.tone-workspace__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);
}

.tone-console__header {
    padding: var(--space-5, 1.25rem) var(--space-6);
    border-block-end: 1px solid var(--tone-line);
}

.tone-console__header h2,
.tone-workspace__header h2,
.tone-workspace--inspector h2,
.tone-workspace--export h2 {
    margin-block-start: var(--space-1);
    font-size: clamp(1.45rem, 2.2vw, 2.15rem);
}

.tone-console__header p:last-child,
.tone-workspace__header p,
.tone-workspace--inspector header > p:last-child,
.tone-workspace--export header > p:last-child {
    margin-block-start: var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-state {
    min-width: 8.5rem;
    min-height: 2.5rem;
    padding-inline: var(--space-3);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    background: var(--tone-control);
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
}

.tone-state__dot,
.tone-scope-panel__signal {
    width: 0.5rem;
    height: 0.5rem;
    flex: 0 0 auto;
    border-radius: 50%;
    background: var(--color-text-secondary);
}

.tone-generator-page[data-active-mode="tone"] .tone-state,
.tone-generator-page[data-active-mode="tone"] .tone-scope-panel__header {
    color: var(--color-mint);
}

.tone-generator-page[data-active-mode] .tone-state__dot,
.tone-generator-page[data-active-mode] .tone-scope-panel__signal {
    background: var(--color-mint);
    box-shadow: 0 0 0.85rem rgb(57 255 182 / 0.45);
}

.tone-console__body {
    display: grid;
    grid-template-columns: minmax(31rem, 1fr) minmax(28rem, 0.9fr);
}

.tone-controls {
    padding: var(--space-6);
    min-width: 0;
    display: grid;
    align-content: start;
    gap: var(--space-5, 1.25rem);
    border-inline-end: 1px solid var(--tone-line);
}

.tone-frequency-block > label,
.tone-fieldset legend,
.tone-tuning-grid label > span:first-child,
.tone-sweep-controls label > span:first-child,
.tone-sweep-controls legend,
.tone-voice label > span:first-child,
.tone-export-controls label > span:first-child {
    display: block;
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.tone-frequency-input {
    margin-block-start: var(--space-2);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: baseline;
    gap: var(--space-3);
}

.tone-frequency-input input {
    width: 100%;
    min-width: 0;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--color-text);
    font-family: var(--font-measurement);
    font-size: clamp(2.8rem, 5vw, 5.2rem);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: -0.04em;
    line-height: 1;
}

.tone-frequency-input input:focus-visible {
    outline-offset: 0.25rem;
}

.tone-frequency-input span {
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-size: var(--text-xl);
    font-weight: var(--font-weight-bold);
}

.tone-log-slider,
.tone-range input[type="range"] {
    width: 100%;
    accent-color: var(--color-mint);
    cursor: pointer;
}

.tone-log-slider {
    margin-block-start: var(--space-4);
}

.tone-log-scale {
    margin-block-start: var(--space-1);
    display: flex;
    justify-content: space-between;
    color: var(--color-text-secondary);
    font-family: var(--font-measurement);
    font-size: 0.68rem;
    font-variant-numeric: tabular-nums;
}

.tone-transport {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(7.5rem, 0.35fr);
    gap: var(--space-3);
}

.tone-play,
.tone-action-button,
.tone-stop,
.tone-secondary-button,
.tone-share-button,
.tone-export-button {
    min-height: 3rem;
    padding: 0 var(--space-4);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
}

.tone-play,
.tone-action-button {
    border: 1px solid color-mix(in srgb, var(--color-mint) 78%, var(--color-cyan));
    background: var(--brand-gradient);
    color: var(--color-background);
}

.tone-play:hover,
.tone-action-button:hover {
    filter: brightness(1.06);
    transform: translateY(-1px);
}

.tone-play svg,
.tone-stop svg,
.tone-scope-panel__footer svg {
    width: 1.1rem;
    height: 1.1rem;
    fill: currentColor;
    stroke: currentColor;
    stroke-width: 1.6;
}

.tone-stop,
.tone-secondary-button,
.tone-share-button {
    border: 1px solid var(--color-border);
    background: var(--tone-control);
    color: var(--color-text);
}

.tone-stop:hover:not(:disabled),
.tone-secondary-button:hover:not(:disabled),
.tone-share-button:hover:not(:disabled) {
    border-color: var(--color-cyan);
    color: var(--color-cyan);
}

button:disabled {
    opacity: 0.42;
    cursor: not-allowed;
    transform: none !important;
}

.tone-fieldset,
.tone-sweep-controls fieldset {
    min-width: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

.tone-segmented {
    margin-block-start: var(--space-2);
    padding: var(--space-1);
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-1);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-background);
}

.tone-segmented button {
    min-height: 2.65rem;
    padding-inline: var(--space-2);
    border: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
}

.tone-segmented button:hover {
    color: var(--color-text);
}

.tone-segmented button[aria-pressed="true"] {
    background: color-mix(in srgb, var(--color-mint) 15%, var(--color-surface-elevated));
    color: var(--color-mint);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-mint) 55%, transparent);
}

.tone-adjust-grid,
.tone-range-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(11rem, 0.55fr);
    gap: var(--space-4);
}

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

.tone-step-controls {
    margin-block-start: var(--space-2);
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: var(--space-1);
}

.tone-step-controls button,
.tone-presets button,
.tone-multi-presets button {
    border: 1px solid var(--color-border);
    background: var(--tone-control);
    color: var(--color-text-secondary);
    font-family: var(--font-measurement);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
}

.tone-step-controls button {
    min-height: 2.65rem;
    border-radius: var(--radius-sm);
}

.tone-step-controls button:hover,
.tone-presets button:hover,
.tone-multi-presets button:hover {
    border-color: var(--color-cyan);
    color: var(--color-cyan);
}

.tone-derived {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-block: 1px solid var(--color-border);
}

.tone-derived span,
.tone-scope-stats span,
.tone-tuning-summary span {
    display: grid;
    align-content: center;
    gap: var(--space-1);
}

.tone-derived span + span,
.tone-scope-stats span + span,
.tone-tuning-summary span + span {
    border-inline-start: 1px solid var(--color-border);
}

.tone-derived span {
    padding: var(--space-3);
}

.tone-derived small,
.tone-scope-stats small,
.tone-tuning-summary small,
.tone-workspace__readout small {
    color: var(--color-text-secondary);
    font-size: 0.68rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.tone-derived strong,
.tone-scope-stats strong,
.tone-tuning-summary strong,
.tone-workspace__readout strong {
    font-family: var(--font-measurement);
    font-variant-numeric: tabular-nums;
}

.tone-range {
    min-width: 0;
    display: grid;
    gap: var(--space-2);
}

.tone-range > span {
    display: flex;
    justify-content: space-between;
    gap: var(--space-3);
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
}

.tone-range strong {
    color: var(--color-text);
}

.tone-range output {
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-variant-numeric: tabular-nums;
}

.tone-range small {
    color: var(--color-text-secondary);
    font-size: 0.68rem;
}

.tone-presets {
    padding-block-start: var(--space-4);
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
    gap: var(--space-4);
    border-block-start: 1px solid var(--color-border);
}

.tone-presets > span,
.tone-multi-presets > span {
    padding-block-start: 0.55rem;
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.tone-presets > div {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tone-presets button {
    min-height: 2.35rem;
    padding: var(--space-1) var(--space-3);
    display: inline-flex;
    align-items: baseline;
    gap: var(--space-2);
    border-radius: var(--radius-pill);
}

.tone-presets button strong {
    color: var(--color-text);
}

.tone-presets button small {
    font-family: var(--font-body);
}

.tone-presets button[aria-pressed="true"] {
    border-color: var(--color-mint);
    background: color-mix(in srgb, var(--color-mint) 14%, var(--tone-control));
}

.tone-scope-panel {
    min-width: 0;
    padding: var(--space-6);
    display: grid;
    grid-template-rows: auto minmax(18rem, 1fr) auto auto;
    gap: var(--space-4);
    background:
        linear-gradient(rgb(52 214 255 / 0.025), rgb(52 214 255 / 0.025)),
        var(--color-background);
}

.tone-scope-panel__header,
.tone-scope-panel__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
}

.tone-scope-panel__header > div {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.tone-scope-panel__header strong {
    color: var(--color-text);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.tone-scope {
    width: 100%;
    height: 100%;
    min-height: 18rem;
    border: 1px solid color-mix(in srgb, var(--color-cyan) 24%, var(--color-border));
    border-radius: var(--radius-md);
    background: #060b0e;
}

.tone-scope-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-block: 1px solid var(--color-border);
}

.tone-scope-stats span {
    padding: var(--space-3) var(--space-4);
}

.tone-scope-panel__footer button {
    min-height: 2.5rem;
    padding-inline: var(--space-3);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text);
    font-size: var(--text-xs);
    cursor: pointer;
}

.tone-scope-panel__footer button:hover {
    border-color: var(--color-mint);
    color: var(--color-mint);
}

.tone-intro {
    padding-block: clamp(var(--space-8), 5vw, var(--space-16));
}

.tone-intro__layout {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(20rem, 0.8fr);
    align-items: start;
    gap: clamp(var(--space-8), 6vw, var(--space-16));
}

.tone-intro__copy {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-8);
}

.tone-intro__copy p,
.tone-safety p {
    color: var(--color-text-secondary);
}

.tone-intro__lead {
    color: var(--color-text) !important;
    font-size: var(--text-lg);
    font-weight: var(--font-weight-medium);
}

.tone-safety {
    padding-block: var(--space-5, 1.25rem);
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--space-4);
    border-block: 1px solid color-mix(in srgb, var(--color-warning) 42%, var(--color-border));
}

.tone-safety__signal {
    width: 0.7rem;
    height: 0.7rem;
    margin-block-start: 0.45rem;
    border: 2px solid var(--color-warning);
    border-radius: 50%;
}

.tone-safety strong {
    color: var(--color-warning);
    font-family: var(--font-display);
    font-size: var(--text-lg);
}

.tone-safety p {
    margin-block-start: var(--space-2);
    font-size: var(--text-sm);
}

.tone-workspaces {
    padding-block: var(--space-8) var(--section-space);
}

.tone-workspaces__stack {
    display: grid;
    gap: var(--space-8);
}

.tone-workspace {
    padding: clamp(var(--space-5, 1.25rem), 4vw, var(--space-8));
}

.tone-workspace__header {
    margin-block-end: var(--space-6);
}

.tone-workspace__header > div:first-child {
    max-width: 48rem;
}

.tone-workspace__readout {
    min-width: 11rem;
    padding: var(--space-3) var(--space-4);
    display: grid;
    gap: var(--space-1);
    border-block: 1px solid var(--color-border);
    text-align: end;
}

.tone-workspace__readout strong {
    color: var(--color-cyan);
    font-size: var(--text-xl);
}

.tone-tuning-grid,
.tone-sweep-controls {
    display: grid;
    grid-template-columns: 1fr 0.7fr 1fr auto;
    align-items: end;
    gap: var(--space-4);
}

.tone-tuning-grid label,
.tone-sweep-controls label,
.tone-export-controls label,
.tone-voice label {
    min-width: 0;
    display: grid;
    gap: var(--space-2);
}

.tone-tuning-grid input,
.tone-tuning-grid select,
.tone-sweep-controls input,
.tone-voice input[type="number"],
.tone-voice select,
.tone-export-controls select {
    width: 100%;
    min-height: 3rem;
    padding: 0 var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--tone-control);
    color: var(--color-text);
}

.tone-input-suffix {
    min-width: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--tone-control);
}

.tone-input-suffix:focus-within {
    outline: var(--focus-ring-width) solid var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
}

.tone-input-suffix input[type="number"] {
    border: 0;
    border-radius: 0;
    outline: none;
    background: transparent;
}

.tone-input-suffix i {
    padding-inline-end: var(--space-3);
    color: var(--color-text-secondary);
    font-family: var(--font-measurement);
    font-size: var(--text-xs);
    font-style: normal;
}

.tone-tuning-summary {
    margin-block-start: var(--space-6);
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-block: 1px solid var(--color-border);
}

.tone-tuning-summary span {
    padding: var(--space-4) var(--space-6);
}

.tone-tuning-summary strong {
    color: var(--color-text);
    font-size: var(--text-lg);
}

.tone-sweep-controls {
    grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(16rem, 1.2fr);
}

.tone-sweep-controls .tone-segmented {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tone-sweep-meter {
    position: relative;
    height: 0.75rem;
    margin-block: var(--space-8) var(--space-4);
    overflow: visible;
    border-radius: var(--radius-pill);
    background: var(--color-background);
    box-shadow: inset 0 0 0 1px var(--color-border);
}

.tone-sweep-meter span {
    position: absolute;
    inset: 0 auto 0 0;
    width: 0%;
    border-radius: inherit;
    background: var(--brand-gradient);
}

.tone-sweep-meter i {
    position: absolute;
    top: 50%;
    left: 0%;
    width: 1.25rem;
    height: 1.25rem;
    border: 0.25rem solid var(--color-surface-elevated);
    border-radius: 50%;
    background: var(--color-mint);
    transform: translate(-50%, -50%);
}

.tone-sweep-footer,
.tone-multi-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.tone-sweep-footer > div,
.tone-multi-footer > div {
    display: flex;
    gap: var(--space-2);
}

.tone-sweep-footer output {
    min-width: 4rem;
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    text-align: end;
}

.tone-check {
    display: inline-flex !important;
    align-items: center;
    gap: var(--space-2) !important;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
}

.tone-check input {
    width: 1.1rem;
    height: 1.1rem;
    accent-color: var(--color-mint);
}

.tone-multi-presets {
    margin-block-end: var(--space-4);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
}

.tone-multi-presets > span {
    padding-block-start: 0;
    margin-inline-end: var(--space-2);
}

.tone-multi-presets button {
    min-height: 2.5rem;
    padding-inline: var(--space-3);
    border-radius: var(--radius-pill);
    font-family: var(--font-body);
}

.tone-voices {
    border-block-start: 1px solid var(--color-border);
}

.tone-voice {
    min-width: 0;
    padding-block: var(--space-4);
    display: grid;
    grid-template-columns: minmax(7rem, 0.65fr) minmax(8rem, 1fr) minmax(8rem, 0.85fr) minmax(9rem, 1fr) minmax(9rem, 1fr) auto;
    align-items: center;
    gap: var(--space-4);
    border-block-end: 1px solid var(--color-border);
}

.tone-voice__identity {
    min-width: 0;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 0 var(--space-2);
}

.tone-voice__identity > span {
    grid-row: 1 / 3;
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-size: var(--text-sm);
}

.tone-voice__identity strong {
    font-family: var(--font-display);
}

.tone-voice__identity button {
    width: fit-content;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 0.68rem;
    cursor: pointer;
}

.tone-voice__identity button:hover {
    color: var(--color-danger);
}

.tone-voice__mute {
    align-self: end;
    min-height: 3rem;
}

.tone-voice .tone-range > span:first-child {
    display: flex;
    align-items: baseline;
}

.tone-multi-footer {
    padding-block-start: var(--space-6);
}

.tone-multi-master {
    width: min(26rem, 36vw);
}

.tone-workspaces__split {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(20rem, 0.75fr);
    gap: var(--space-8);
}

.tone-workspace--inspector,
.tone-workspace--export {
    min-width: 0;
}

.tone-inspector-tabs {
    max-width: 28rem;
    margin-block: var(--space-5, 1.25rem);
}

.tone-inspector-visuals {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
}

.tone-inspector-visuals figure {
    min-width: 0;
}

.tone-inspector-visuals canvas {
    width: 100%;
    height: 9rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-background);
}

.tone-inspector-visuals figcaption {
    margin-block-start: var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
}

.tone-workspace--inspector > p {
    margin-block-start: var(--space-5, 1.25rem);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-export-controls {
    margin-block: var(--space-6) var(--space-4);
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
}

.tone-export-button,
.tone-share-button {
    width: 100%;
}

.tone-share-button {
    margin-block-start: var(--space-2);
}

.tone-export-status {
    margin-block-start: var(--space-4);
    color: var(--color-cyan);
    font-size: var(--text-sm);
}

.tone-workspace--export > small {
    display: block;
    margin-block-start: var(--space-2);
    color: var(--color-text-secondary);
}

.tone-how-to,
.tone-copy-section,
.tone-waveform-guide,
.tone-practical,
.tone-capabilities,
.tone-related,
.tone-faq {
    padding-block: var(--section-space);
}

.tone-copy-section--split,
.tone-practical,
.tone-related,
.tone-faq {
    background: color-mix(in srgb, var(--color-cyan) 2%, var(--color-surface));
}

.tone-section-heading {
    max-width: 54rem;
    margin-block-end: var(--space-10, 2.5rem);
}

.tone-section-heading h2,
.tone-copy-prose h2 {
    margin-block-start: var(--space-2);
    font-size: clamp(2rem, 3.2vw, 3.25rem);
}

.tone-section-heading > p:last-child,
.tone-copy-prose p {
    margin-block-start: var(--space-4);
    color: var(--color-text-secondary);
    font-size: var(--text-lg);
}

.tone-steps {
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-12);
    list-style: none;
}

.tone-steps li {
    padding-block: var(--space-5, 1.25rem);
    display: grid;
    grid-template-columns: 2.25rem minmax(0, 1fr);
    gap: var(--space-4);
    border-block-start: 1px solid var(--color-border);
}

.tone-steps li > span {
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-bold);
}

.tone-steps h3 {
    font-size: var(--text-lg);
}

.tone-steps p,
.tone-practical__list p {
    margin-block-start: var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-copy-split,
.tone-copy-paired {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(var(--space-8), 7vw, var(--space-20));
}

.tone-copy-prose {
    max-width: 70ch;
}

.tone-copy-prose p {
    max-width: none;
}

.tone-copy-prose p + p {
    margin-block-start: var(--space-5, 1.25rem);
}

.tone-copy-prose--secondary,
.tone-copy-prose--safe {
    padding-block-start: var(--space-8);
    border-block-start: 1px solid var(--color-border);
}

.tone-copy-section--paired {
    padding-block: clamp(var(--space-16), 7vw, var(--space-24));
}

.tone-copy-section--narrow .tone-copy-prose {
    max-width: 58rem;
}

.tone-waveform-table {
    border-block-start: 1px solid var(--color-border);
}

.tone-waveform-table__row {
    min-height: 5.25rem;
    padding-block: var(--space-4);
    display: grid;
    grid-template-columns: minmax(8rem, 0.55fr) minmax(14rem, 1fr) minmax(18rem, 1.35fr);
    align-items: center;
    gap: var(--space-6);
    border-block-end: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.tone-waveform-table__row strong {
    color: var(--color-text);
    font-family: var(--font-display);
    font-size: var(--text-lg);
}

.tone-waveform-table__row strong small {
    display: block;
    margin-block-start: var(--space-1);
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-regular);
    line-height: 1.4;
}

.tone-waveform-table__row--head {
    min-height: 3.5rem;
    color: var(--color-cyan);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.tone-practical__layout,
.tone-faq__layout {
    display: grid;
    grid-template-columns: minmax(17rem, 0.72fr) minmax(0, 1.28fr);
    align-items: start;
    gap: clamp(var(--space-8), 7vw, var(--space-20));
}

.tone-section-heading--sticky {
    position: sticky;
    top: calc(var(--space-20) + var(--space-6));
}

.tone-practical__list {
    border-block-start: 1px solid var(--color-border);
}

.tone-practical__list article {
    padding-block: var(--space-5, 1.25rem);
    display: grid;
    grid-template-columns: minmax(11rem, 0.55fr) minmax(0, 1fr);
    gap: var(--space-6);
    border-block-end: 1px solid var(--color-border);
}

.tone-practical__list h3 {
    font-size: var(--text-lg);
}

.tone-capabilities__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-12);
}

.tone-capabilities__grid > div {
    padding-block: var(--space-6);
    border-block: 1px solid var(--color-border);
}

.tone-capabilities h3 {
    font-size: var(--text-2xl);
}

.tone-capabilities ul {
    margin: var(--space-5, 1.25rem) 0 0;
    padding-inline-start: 1.2rem;
}

.tone-capabilities li {
    color: var(--color-text-secondary);
}

.tone-capabilities li + li {
    margin-block-start: var(--space-3);
}

.tone-related__links {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-block-start: 1px solid var(--color-border);
}

.tone-related__links a {
    min-height: 10rem;
    padding: var(--space-6);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-content: start;
    gap: var(--space-3) var(--space-4);
    border-block-end: 1px solid var(--color-border);
    color: var(--color-text);
    text-decoration: none;
}

.tone-related__links a:not(:nth-child(3n)) {
    border-inline-end: 1px solid var(--color-border);
}

.tone-related__links strong {
    font-family: var(--font-display);
    font-size: var(--text-lg);
}

.tone-related__links span {
    grid-column: 1 / -1;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-related__links i {
    color: var(--color-cyan);
    font-style: normal;
}

.tone-related__links a:hover {
    background: color-mix(in srgb, var(--color-cyan) 4%, transparent);
}

.tone-faq__list {
    border-block-start: 1px solid var(--color-border);
}

.tone-faq__list details {
    border-block-end: 1px solid var(--color-border);
}

.tone-faq__list summary {
    min-height: 4.5rem;
    padding-block: var(--space-4);
    display: grid;
    grid-template-columns: minmax(0, 1fr) 2.5rem;
    align-items: center;
    gap: var(--space-4);
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
    list-style: none;
    cursor: pointer;
}

.tone-faq__list summary::marker,
.tone-faq__list summary::-webkit-details-marker {
    content: "";
    display: none;
}

.tone-faq__list summary > span:last-child {
    width: 2.25rem;
    height: 2.25rem;
    display: grid;
    place-items: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    color: var(--color-cyan);
    font-size: var(--text-xl);
    font-weight: var(--font-weight-regular);
}

.tone-faq__list details[open] summary > span:last-child {
    transform: rotate(45deg);
}

.tone-faq__list details p {
    max-width: 70ch;
    padding: var(--space-1) 4.25rem var(--space-6) 0;
    color: var(--color-text-secondary);
}

@media (max-width: 70rem) {
    .tone-console__body,
    .tone-workspaces__split {
        grid-template-columns: 1fr;
    }

    .tone-controls {
        border-inline-end: 0;
        border-block-end: 1px solid var(--tone-line);
    }

    .tone-scope-panel {
        grid-template-rows: auto minmax(20rem, 24rem) auto auto;
    }

    .tone-tuning-grid,
    .tone-sweep-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tone-tuning-grid .tone-secondary-button {
        width: 100%;
    }

    .tone-voice {
        grid-template-columns: minmax(7rem, 0.7fr) repeat(2, minmax(9rem, 1fr));
    }

    .tone-voice__mute {
        align-self: center;
    }
}

@media (max-width: 56rem) {
    .tone-intro__layout,
    .tone-intro__copy,
    .tone-copy-split,
    .tone-copy-paired,
    .tone-practical__layout,
    .tone-faq__layout {
        grid-template-columns: 1fr;
    }

    .tone-section-heading--sticky {
        position: static;
    }

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

    .tone-voice__identity {
        grid-column: 1 / -1;
    }

    .tone-multi-footer {
        align-items: stretch;
        flex-direction: column;
    }

    .tone-multi-master {
        width: 100%;
    }

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

    .tone-related__links a:not(:nth-child(3n)) {
        border-inline-end: 0;
    }

    .tone-related__links a:nth-child(odd) {
        border-inline-end: 1px solid var(--color-border);
    }
}

@media (max-width: 42rem) {
    .tone-hero {
        padding-block: var(--space-6) var(--space-4);
    }

    .tone-hero__eyebrow {
        font-size: 0.65rem;
    }

    .tone-console,
    .tone-workspace {
        border-radius: var(--radius-lg);
    }

    .tone-console__header,
    .tone-workspace__header {
        align-items: flex-start;
        flex-direction: column;
        gap: var(--space-4);
    }

    .tone-state,
    .tone-workspace__readout {
        width: 100%;
        text-align: start;
    }

    .tone-controls,
    .tone-scope-panel,
    .tone-workspace {
        padding: var(--space-4);
    }

    .tone-frequency-input input {
        font-size: clamp(2.5rem, 15vw, 4rem);
    }

    .tone-transport,
    .tone-adjust-grid,
    .tone-range-grid,
    .tone-tuning-grid,
    .tone-sweep-controls,
    .tone-inspector-visuals,
    .tone-export-controls,
    .tone-steps,
    .tone-capabilities__grid {
        grid-template-columns: 1fr;
    }

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

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

    .tone-presets {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }

    .tone-presets > span {
        padding-block-start: 0;
    }

    .tone-scope-panel {
        grid-template-rows: auto 16rem auto auto;
    }

    .tone-scope {
        min-height: 16rem;
    }

    .tone-scope-stats,
    .tone-tuning-summary {
        grid-template-columns: 1fr;
    }

    .tone-scope-stats span + span,
    .tone-tuning-summary span + span {
        border-inline-start: 0;
        border-block-start: 1px solid var(--color-border);
    }

    .tone-scope-panel__footer,
    .tone-sweep-footer {
        align-items: stretch;
        flex-direction: column;
    }

    .tone-scope-panel__footer button,
    .tone-sweep-footer > div,
    .tone-sweep-footer button {
        width: 100%;
    }

    .tone-sweep-footer > div {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tone-sweep-footer output {
        text-align: start;
    }

    .tone-voice {
        grid-template-columns: 1fr;
    }

    .tone-voice__identity {
        grid-column: auto;
    }

    .tone-multi-footer > div,
    .tone-multi-footer button {
        width: 100%;
    }

    .tone-practical__list article,
    .tone-waveform-table__row {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }

    .tone-waveform-table__row--head {
        display: none;
    }

    .tone-related__links {
        grid-template-columns: 1fr;
    }

    .tone-related__links a,
    .tone-related__links a:nth-child(odd) {
        border-inline-end: 0;
    }

    .tone-faq__list details p {
        padding-inline-end: 0;
    }
}

@media (hover: none) {
    .tone-play:hover,
    .tone-action-button:hover {
        transform: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .tone-generator-page[data-active-mode] .tone-state__dot,
    .tone-generator-page[data-active-mode] .tone-scope-panel__signal {
        box-shadow: none;
    }
}

/* Compact primary instrument dashboard */
.tone-primary {
    padding-block-end: var(--space-6);
}

.tone-console__header {
    padding: var(--space-4) var(--space-5, 1.25rem);
}

.tone-console__header h2 {
    font-size: clamp(1.35rem, 1.8vw, 1.85rem);
}

.tone-console__header p:last-child {
    margin-block-start: var(--space-1);
}

.tone-dashboard {
    padding: var(--space-4) var(--space-5, 1.25rem) var(--space-3);
    display: grid;
    gap: var(--space-3);
}

.tone-dashboard__top {
    display: grid;
    grid-template-columns: minmax(12.5rem, 1.2fr) minmax(10.5rem, 0.9fr) minmax(10.5rem, 0.9fr) minmax(9rem, 0.72fr) auto;
    align-items: end;
    gap: var(--space-3);
}

.tone-dashboard__transport {
    display: grid;
    grid-template-columns: minmax(7.5rem, 1fr) auto;
    gap: var(--space-2);
}

.tone-dashboard__transport .tone-play,
.tone-dashboard__transport .tone-stop,
.tone-dashboard__share {
    min-height: 2.75rem;
}

.tone-dashboard__field {
    min-width: 0;
    display: grid;
    gap: 0.35rem;
}

.tone-dashboard__field > span:first-child,
.tone-dashboard__frequency > div:first-child > span,
.tone-dashboard__steps legend {
    color: var(--color-text-secondary);
    font-size: 0.68rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.065em;
    text-transform: uppercase;
}

.tone-dashboard__field select,
.tone-dashboard__input-suffix,
.tone-dashboard__note-inputs select {
    min-height: 2.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--tone-control);
    color: var(--color-text);
}

.tone-dashboard__field select {
    width: 100%;
    padding-inline: var(--space-3);
}

.tone-dashboard__input-suffix {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
}

.tone-dashboard__input-suffix:focus-within {
    outline: var(--focus-ring-width) solid var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
}

.tone-dashboard__input-suffix input {
    width: 100%;
    min-width: 0;
    height: 2.65rem;
    padding-inline: var(--space-3) var(--space-1);
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--color-text);
    font-family: var(--font-measurement);
    font-size: var(--text-lg);
    font-weight: var(--font-weight-bold);
    font-variant-numeric: tabular-nums;
}

.tone-dashboard__input-suffix i {
    padding-inline-end: var(--space-3);
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-size: var(--text-xs);
    font-style: normal;
    font-weight: var(--font-weight-bold);
}

.tone-dashboard__field small {
    min-height: 1rem;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text-secondary);
    font-family: var(--font-measurement);
    font-size: 0.68rem;
    font-variant-numeric: tabular-nums;
}

.tone-dashboard__field small strong {
    color: var(--color-mint);
}

.tone-dashboard__note-inputs {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(3.75rem, 0.65fr);
    gap: var(--space-2);
}

.tone-dashboard__share {
    padding-inline: var(--space-3);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--tone-control);
    color: var(--color-text);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    white-space: nowrap;
    cursor: pointer;
}

.tone-dashboard__share:hover {
    border-color: var(--color-cyan);
    color: var(--color-cyan);
}

.tone-dashboard__share svg {
    width: 1rem;
    height: 1rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.7;
}

.tone-dashboard__frequency {
    padding-block: var(--space-2) var(--space-1);
    border-block: 1px solid var(--color-border);
}

.tone-dashboard__frequency > div:first-child {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-4);
}

.tone-dashboard__frequency output {
    color: var(--color-mint);
    font-family: var(--font-measurement);
    font-size: var(--text-lg);
    font-weight: var(--font-weight-bold);
    font-variant-numeric: tabular-nums;
}

.tone-dashboard__frequency .tone-log-slider {
    margin-block-start: var(--space-1);
}

.tone-dashboard__frequency .tone-log-scale {
    margin-block-start: 0;
}

.tone-scope-panel--strip {
    min-width: 0;
    padding: var(--space-2) var(--space-3);
    display: grid;
    grid-template-rows: auto 8.25rem auto;
    gap: var(--space-2);
    border: 1px solid color-mix(in srgb, var(--color-cyan) 22%, var(--color-border));
    border-radius: var(--radius-md);
    background: #060b0e;
}

.tone-scope-panel--strip .tone-scope-panel__header {
    min-width: 0;
    align-items: center;
}

.tone-scope-panel--strip .tone-scope-panel__header > div:first-child {
    min-width: 0;
    flex-wrap: wrap;
}

.tone-scope-panel--strip .tone-scope-panel__header > div:first-child > span:last-child {
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-variant-numeric: tabular-nums;
}

.tone-scope-panel--strip .tone-scope {
    height: 8.25rem;
    min-height: 0;
    border: 0;
    border-radius: var(--radius-sm);
}

.tone-scope-panel--strip .tone-scope-stats {
    width: min(30rem, 48%);
    flex: 0 1 auto;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border: 0;
}

.tone-scope-panel--strip .tone-scope-stats span {
    padding: 0 var(--space-3);
}

.tone-scope-panel--strip .tone-scope-stats strong {
    font-size: var(--text-xs);
    white-space: nowrap;
}

.tone-scope-panel__caption {
    color: var(--color-text-secondary);
    font-size: 0.68rem;
}

.tone-dashboard__utility {
    display: grid;
    grid-template-columns: minmax(30rem, 1.18fr) minmax(25rem, 0.82fr);
    align-items: end;
    gap: var(--space-6);
}

.tone-dashboard__steps .tone-step-controls {
    grid-template-columns: repeat(6, minmax(0, 1fr));
}

.tone-dashboard__steps .tone-step-controls button {
    min-height: 2.35rem;
    padding-inline: var(--space-1);
    white-space: nowrap;
}

.tone-dashboard__outputs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
}

.tone-dashboard__outputs .tone-range {
    gap: var(--space-1);
}

.tone-dashboard__outputs .tone-range small {
    white-space: nowrap;
}

.tone-dashboard__presets {
    padding-block: var(--space-2) 0;
    align-items: center;
}

.tone-dashboard__presets > span {
    padding-block-start: 0.35rem;
}

.tone-dashboard__presets > div {
    flex-wrap: nowrap;
}

.tone-dashboard__presets button {
    min-height: 2rem;
    padding: 0.2rem var(--space-3);
}

.tone-dashboard__presets button small {
    display: none;
}

@media (max-width: 70rem) {
    .tone-dashboard__top {
        grid-template-columns: minmax(13rem, 1.15fr) repeat(2, minmax(10rem, 1fr));
    }

    .tone-dashboard__share {
        width: 100%;
    }

    .tone-dashboard__utility {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }

    .tone-dashboard__presets > div {
        flex-wrap: wrap;
    }
}

@media (max-width: 52rem) {
    .tone-dashboard__top {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tone-dashboard__transport {
        grid-column: 1 / -1;
    }

    .tone-scope-panel--strip .tone-scope-panel__header {
        align-items: flex-start;
        flex-direction: column;
    }

    .tone-scope-panel--strip .tone-scope-stats {
        width: 100%;
    }

    .tone-scope-panel--strip .tone-scope-stats span:first-child {
        padding-inline-start: 0;
    }
}

@media (max-width: 42rem) {
    .tone-dashboard {
        padding: var(--space-3);
    }

    .tone-dashboard__top {
        grid-template-columns: 1fr;
    }

    .tone-dashboard__transport {
        grid-column: auto;
    }

    .tone-dashboard__field--note,
    .tone-dashboard__field--waveform {
        grid-template-columns: 6.5rem minmax(0, 1fr);
        align-items: center;
    }

    .tone-dashboard__field--note > span,
    .tone-dashboard__field--waveform > span {
        margin: 0;
    }

    .tone-dashboard__frequency output {
        font-size: var(--text-base);
    }

    .tone-dashboard__frequency .tone-log-scale span:nth-child(2),
    .tone-dashboard__frequency .tone-log-scale span:nth-child(4),
    .tone-dashboard__frequency .tone-log-scale span:nth-child(6) {
        display: none;
    }

    .tone-scope-panel--strip {
        grid-template-rows: auto 7rem auto;
    }

    .tone-scope-panel--strip .tone-scope {
        height: 7rem;
    }

    .tone-scope-panel--strip .tone-scope-stats span {
        padding-inline: var(--space-2);
        min-width: 0;
    }

    .tone-scope-panel--strip .tone-scope-stats small {
        font-size: 0.61rem;
        white-space: normal;
        overflow-wrap: anywhere;
    }

    .tone-scope-panel--strip .tone-scope-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tone-scope-panel--strip .tone-scope-stats span:last-child {
        grid-column: 1 / -1;
    }

    .tone-dashboard__steps .tone-step-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tone-dashboard__outputs {
        grid-template-columns: 1fr;
    }

    .tone-dashboard__outputs .tone-range small,
    .tone-scope-panel--strip .tone-scope-stats strong {
        white-space: normal;
        overflow-wrap: anywhere;
    }

    .tone-range input[type="range"] {
        min-width: 0;
        max-width: 100%;
    }

    .tone-dashboard__presets {
        grid-template-columns: 1fr;
    }

    .tone-dashboard__presets > div {
        gap: var(--space-1);
    }

    .tone-dashboard__presets button {
        padding-inline: var(--space-2);
    }
}

/* Final instrument refinement */
.tone-generator-page select {
    min-height: 2.75rem;
    padding: 0 2.45rem 0 var(--space-3);
    appearance: none;
    -webkit-appearance: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background-color: var(--tone-control);
    background-image:
        linear-gradient(45deg, transparent 50%, var(--color-text-secondary) 50%),
        linear-gradient(135deg, var(--color-text-secondary) 50%, transparent 50%);
    background-position:
        calc(100% - 1rem) calc(50% - 0.12rem),
        calc(100% - 0.7rem) calc(50% - 0.12rem);
    background-repeat: no-repeat;
    background-size: 0.32rem 0.32rem, 0.32rem 0.32rem;
    color: var(--color-text);
    line-height: 1.2;
}

.tone-generator-page select:hover {
    border-color: color-mix(in srgb, var(--color-cyan) 55%, var(--color-border));
}

.tone-generator-page select:focus-visible {
    border-color: var(--color-mint);
    outline: var(--focus-ring-width) solid var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
}

.tone-generator-page select option,
.tone-generator-page select optgroup {
    background: var(--color-surface-elevated);
    color: var(--color-text);
}

.tone-dashboard__top {
    grid-template-columns: minmax(13rem, 1.12fr) minmax(11rem, 0.9fr) minmax(11rem, 0.92fr) minmax(11.5rem, 0.92fr) minmax(9.25rem, 0.7fr);
    align-items: start;
}

.tone-dashboard__field,
.tone-dashboard__control {
    min-width: 0;
    display: grid;
    grid-template-rows: 0.8rem 2.75rem 1rem;
    gap: 0.35rem;
}

.tone-dashboard__control > span,
.tone-dashboard__field > span:first-child,
.tone-dashboard__frequency > div:first-child > span,
.tone-dashboard__steps legend {
    color: var(--color-text-secondary);
    font-size: 0.68rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.065em;
    line-height: 0.8rem;
    text-transform: uppercase;
}

.tone-dashboard__control small,
.tone-dashboard__field small {
    min-width: 0;
    overflow: hidden;
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-size: 0.66rem;
    line-height: 1rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tone-dashboard__field--frequency small {
    font-family: var(--font-measurement);
}

.tone-dashboard__share {
    width: 100%;
    min-height: 2.75rem;
}

.tone-dashboard__steps legend small,
.tone-dashboard__presets > span small {
    margin-inline-start: var(--space-2);
    color: var(--color-text-secondary);
    font-size: 0.64rem;
    font-weight: var(--font-weight-regular);
    letter-spacing: 0;
    text-transform: none;
}

.tone-tool-guide {
    margin-block: var(--space-4) var(--space-5, 1.25rem);
    padding-block: var(--space-3);
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-5, 1.25rem);
    border-block: 1px solid var(--color-border);
}

.tone-tool-guide p {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-tool-guide strong {
    margin-inline-end: var(--space-2);
    color: var(--color-cyan);
    font-size: 0.7rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.tone-tool-guide--stacked {
    grid-template-columns: 1fr;
    gap: var(--space-2);
}

.tone-inspector-select {
    width: min(20rem, 100%);
    margin-block: var(--space-5, 1.25rem);
    display: grid;
    gap: var(--space-2);
}

.tone-inspector-select > span {
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.tone-reference {
    padding-block: clamp(3rem, 5vw, 5rem);
}

.tone-reference--pan {
    background: color-mix(in srgb, var(--color-cyan) 2%, var(--color-surface));
}

.tone-reference__layout {
    display: grid;
    grid-template-columns: minmax(20rem, 0.9fr) minmax(28rem, 1.1fr);
    align-items: center;
    gap: clamp(var(--space-8), 6vw, var(--space-16));
}

.tone-reference__copy {
    max-width: 66ch;
}

.tone-reference__copy h2 {
    font-size: clamp(2rem, 3.2vw, 3.25rem);
}

.tone-reference__copy p {
    margin-block-start: var(--space-4);
    color: var(--color-text-secondary);
    font-size: var(--text-base);
}

.tone-reference__instrument,
.tone-pan-reference {
    padding-block: var(--space-5, 1.25rem);
    border-block: 1px solid color-mix(in srgb, var(--color-cyan) 28%, var(--color-border));
}

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

.tone-reference__formula {
    padding: 0 var(--space-5, 1.25rem) var(--space-5, 1.25rem);
    display: grid;
    gap: var(--space-2);
}

.tone-reference__formula + .tone-reference__formula {
    border-inline-start: 1px solid var(--color-border);
}

.tone-reference__formula span,
.tone-reference__live dt,
.tone-pan-reference__labels,
.tone-pan-reference__notes strong {
    color: var(--color-text-secondary);
    font-size: 0.68rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.065em;
    text-transform: uppercase;
}

.tone-reference__formula strong {
    color: var(--color-mint);
    font-family: var(--font-measurement);
    font-size: var(--text-xl);
}

.tone-reference__live {
    grid-column: 1 / -1;
    margin: 0;
    padding-block-start: var(--space-4);
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-block-start: 1px solid var(--color-border);
}

.tone-reference__live div {
    min-width: 0;
    padding-inline: var(--space-5, 1.25rem);
}

.tone-reference__live div + div {
    border-inline-start: 1px solid var(--color-border);
}

.tone-reference__live dd {
    margin: var(--space-2) 0 0;
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-size: var(--text-lg);
    font-weight: var(--font-weight-bold);
    font-variant-numeric: tabular-nums;
}

.tone-reference__links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3) var(--space-5, 1.25rem);
}

.tone-reference__links a {
    color: var(--color-cyan);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-semibold);
    text-underline-offset: 0.25em;
}

.tone-pan-reference__labels {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}

.tone-pan-reference__labels strong {
    color: var(--color-mint);
    text-align: center;
}

.tone-pan-reference__labels span:last-child {
    text-align: end;
}

.tone-pan-reference__track {
    position: relative;
    height: 0.35rem;
    margin-block: var(--space-5, 1.25rem) var(--space-6);
    border-radius: var(--radius-pill);
    background: linear-gradient(90deg, var(--color-cyan), var(--color-mint) 50%, var(--color-cyan));
}

.tone-pan-reference__track::after {
    content: "";
    position: absolute;
    inset-block: -0.3rem;
    left: 50%;
    width: 1px;
    background: var(--color-text);
    opacity: 0.45;
}

.tone-pan-reference__track > span {
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 1;
    width: 1.15rem;
    height: 1.15rem;
    border: 0.2rem solid var(--color-surface-elevated);
    border-radius: 50%;
    background: var(--color-mint);
    box-shadow: 0 0 0.8rem rgb(57 255 182 / 0.32);
    transform: translate(-50%, -50%);
}

.tone-pan-reference__notes {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6);
}

.tone-pan-reference__notes p {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-pan-reference__notes strong {
    display: block;
    margin-block-end: var(--space-2);
    color: var(--color-cyan);
}

.tone-faq__header {
    max-width: 100%;
    margin-block-end: var(--space-8);
}

.tone-faq__header > p:last-child {
    max-width: 62ch;
}

.tone-faq__columns {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(var(--space-8), 6vw, var(--space-16));
}

.tone-faq__list summary {
    min-height: 4.25rem;
}

.tone-faq__list details p {
    padding-inline-end: 3.5rem;
}

@media (max-width: 70rem) {
    .tone-dashboard__top {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .tone-dashboard__control--transport {
        grid-column: span 2;
    }

    .tone-dashboard__control--share {
        grid-column: auto;
    }

    .tone-reference__layout {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
}

@media (max-width: 52rem) {
    .tone-dashboard__top,
    .tone-faq__columns {
        grid-template-columns: 1fr;
    }

    .tone-dashboard__control--transport {
        grid-column: auto;
    }

    .tone-tool-guide {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }
}

@media (max-width: 42rem) {
    .tone-dashboard__field--note,
    .tone-dashboard__field--waveform {
        grid-template-columns: 1fr;
        grid-template-rows: 0.8rem 2.75rem 1rem;
        align-items: initial;
    }

    .tone-reference {
        padding-block: var(--space-12);
    }

    .tone-reference__instrument,
    .tone-reference__live,
    .tone-pan-reference__notes {
        grid-template-columns: 1fr;
    }

    .tone-reference__formula {
        padding-inline: 0;
    }

    .tone-reference__formula + .tone-reference__formula,
    .tone-reference__live div + div {
        padding-block-start: var(--space-4);
        border-inline-start: 0;
        border-block-start: 1px solid var(--color-border);
    }

    .tone-reference__live div {
        padding: var(--space-3) 0;
    }
}

/* Final content and visual polish */
.tone-dashboard__presets button {
    min-height: 2.65rem;
    padding: 0.3rem 0.75rem;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: 0.12rem;
    line-height: 1;
    text-align: center;
}

.tone-dashboard__presets button strong,
.tone-dashboard__presets button small {
    display: block;
    margin: 0;
    line-height: 1;
}

.tone-dashboard__presets button strong {
    font-size: 0.76rem;
}

.tone-dashboard__presets button small {
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-size: 0.58rem;
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.01em;
    text-transform: none;
}

.tone-quickstart {
    padding-block: 0 var(--space-12);
}

.tone-quickstart__stack {
    display: grid;
    gap: var(--space-6);
}

.tone-early-warning {
    padding: var(--space-4) var(--space-5, 1.25rem);
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
    gap: var(--space-3);
    border: 1px solid color-mix(in srgb, var(--color-warning) 42%, var(--color-border));
    border-radius: var(--radius-md);
    background: color-mix(in srgb, var(--color-warning) 5%, var(--color-surface));
}

.tone-early-warning--before-play {
    margin: 0 var(--space-6) var(--space-4);
}

.tone-early-warning svg {
    width: 1.35rem;
    height: 1.35rem;
    margin-block-start: 0.1rem;
    fill: none;
    stroke: var(--color-warning);
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.7;
}

.tone-early-warning strong {
    color: var(--color-warning);
    font-family: var(--font-display);
    font-size: var(--text-base);
}

.tone-early-warning p {
    margin-block-start: var(--space-1);
    max-width: none;
    color: color-mix(in srgb, var(--color-warning) 32%, var(--color-text));
    font-size: var(--text-sm);
}

.tone-use-guide {
    overflow: hidden;
    border: 1px solid var(--tone-line);
    border-radius: var(--radius-xl);
    background: var(--tone-panel);
}

.tone-use-guide > header {
    padding: var(--space-6) var(--space-6) var(--space-5, 1.25rem);
}

.tone-use-guide h2 {
    font-size: clamp(1.65rem, 2.5vw, 2.35rem);
}

.tone-use-guide > header p {
    margin-block-start: var(--space-2);
    color: var(--color-text-secondary);
}

.tone-use-guide__steps {
    margin: 0;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    list-style: none;
    border-block: 1px solid var(--color-border);
}

.tone-use-guide__steps li {
    min-width: 0;
    padding: var(--space-5, 1.25rem) var(--space-5, 1.25rem);
    display: grid;
    grid-template-columns: 2rem minmax(0, 1fr);
    gap: var(--space-3);
}

.tone-use-guide__steps li:first-child {
    padding-inline-start: 0;
}

.tone-use-guide__steps li:last-child {
    padding-inline-end: 0;
}

.tone-use-guide__steps li + li {
    border-inline-start: 1px solid var(--color-border);
}

.tone-use-guide__steps li > span {
    width: 2rem;
    height: 2rem;
    display: grid;
    place-items: center;
    border: 1px solid color-mix(in srgb, var(--color-cyan) 40%, var(--color-border));
    border-radius: 50%;
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-bold);
}

.tone-use-guide__steps h3,
.tone-shortcuts h3 {
    font-size: var(--text-base);
}

.tone-use-guide__steps p {
    margin-block-start: var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-shortcuts {
    padding: var(--space-5, 1.25rem) var(--space-6) var(--space-6);
}

.tone-shortcuts__table {
    margin-block-start: var(--space-3);
    border-block-start: 1px solid var(--color-border);
}

.tone-shortcuts__row {
    min-height: 2.9rem;
    padding-block: var(--space-2);
    display: grid;
    grid-template-columns: minmax(5rem, 0.35fr) minmax(12rem, 0.8fr) minmax(16rem, 1.25fr);
    align-items: center;
    gap: var(--space-4);
    border-block-end: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-shortcuts__row--head {
    min-height: 2.25rem;
    color: var(--color-cyan);
    font-size: 0.68rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.tone-shortcuts__row kbd {
    width: fit-content;
    min-width: 3.25rem;
    padding: 0.28rem 0.55rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xs);
    background: var(--tone-control);
    color: var(--color-mint);
    font-family: var(--font-measurement);
    font-size: var(--text-xs);
    text-align: center;
}

.tone-shortcuts__row strong {
    color: var(--color-text);
    font-size: var(--text-sm);
}

.tone-intro {
    padding-block: var(--space-6) var(--space-12);
}

.tone-intro__layout--compact {
    display: block;
}

.tone-intro__layout--compact .tone-intro__copy {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    padding-block: var(--space-5, 1.25rem);
    border-block: 1px solid var(--color-border);
}

.tone-intro__copy h2 {
    grid-column: 1 / -1;
}

.tone-control-glossary {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-4);
    margin-block-start: var(--space-3);
}

.tone-control-glossary div {
    padding-block-start: var(--space-3);
    border-block-start: 1px solid var(--color-border);
}

.tone-control-glossary dt {
    color: var(--color-text);
    font-weight: var(--font-weight-bold);
}

.tone-control-glossary dd {
    margin-block-start: var(--space-1);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    line-height: 1.55;
}

.tone-page-links {
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
    padding-block-start: var(--space-3);
}

.tone-page-links a {
    color: var(--color-cyan);
    font-size: var(--text-sm);
    text-underline-offset: 0.2em;
}

@media (max-width: 900px) {
    .tone-control-glossary {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 600px) {
    .tone-control-glossary {
        grid-template-columns: 1fr;
    }

    .tone-early-warning--before-play {
        margin-inline: var(--space-4);
    }
}

.tone-learning,
.tone-spectrum-reference,
.tone-accuracy {
    padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}

.tone-learning--foundations,
.tone-accuracy {
    background: color-mix(in srgb, var(--color-cyan) 2%, var(--color-surface));
}

.tone-learning__pair {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(var(--space-8), 5vw, var(--space-16));
}

.tone-concept {
    min-width: 0;
}

.tone-concept__copy {
    padding-block-end: var(--space-5, 1.25rem);
    border-block-end: 1px solid var(--color-border);
}

.tone-concept h2,
.tone-accuracy h2 {
    font-size: clamp(2rem, 3.2vw, 3.15rem);
}

.tone-concept__copy p,
.tone-accuracy__copy p,
.tone-safe-listening header p {
    margin-block-start: var(--space-4);
    color: var(--color-text-secondary);
    font-size: var(--text-base);
}

.tone-cycle-reference {
    border-block-end: 1px solid var(--color-border);
}

.tone-cycle-reference > div {
    min-height: 5rem;
    display: grid;
    grid-template-columns: 5.5rem minmax(9rem, 1fr) minmax(8rem, 0.9fr);
    align-items: center;
    gap: var(--space-4);
    border-block-start: 1px solid var(--color-border);
}

.tone-cycle-reference > div:first-child {
    border-block-start: 0;
}

.tone-cycle-reference strong,
.tone-octave-chain strong,
.tone-cents-reference strong,
.tone-beat-equation strong {
    color: var(--color-mint);
    font-family: var(--font-measurement);
    font-variant-numeric: tabular-nums;
}

.tone-cycle-reference span {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-cycle-reference svg,
.tone-wavelength-comparison svg {
    width: 100%;
    height: auto;
    fill: none;
    stroke: var(--color-cyan);
    stroke-linecap: round;
    stroke-width: 1.8;
}

.tone-diagram-note {
    margin-block-start: var(--space-3);
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
}

.tone-octave-chain {
    padding-block: var(--space-8);
    display: grid;
    grid-template-columns: 1fr auto 1fr auto 1fr;
    align-items: center;
    gap: var(--space-3);
}

.tone-octave-chain div {
    min-height: 6.2rem;
    display: grid;
    place-content: center;
    gap: var(--space-2);
    border-block: 1px solid var(--color-border);
    text-align: center;
}

.tone-octave-chain div.is-reference {
    border-color: color-mix(in srgb, var(--color-mint) 55%, var(--color-border));
    background: color-mix(in srgb, var(--color-mint) 4%, transparent);
}

.tone-octave-chain div span {
    color: var(--color-text);
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: var(--font-weight-bold);
}

.tone-octave-chain i {
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-size: var(--text-xs);
    font-style: normal;
}

.tone-cents-reference {
    padding: var(--space-4) 0;
    display: grid;
    grid-template-columns: auto auto auto minmax(0, 1fr);
    align-items: center;
    gap: var(--space-3);
    border-block: 1px solid var(--color-border);
}

.tone-cents-reference span,
.tone-cents-reference p {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-cents-reference p {
    text-align: end;
}

.tone-wavelength-comparison {
    grid-column: 1 / -1;
    padding: var(--space-5, 1.25rem);
    border-block-start: 1px solid var(--color-border);
}

.tone-wavelength-comparison > div {
    min-height: 3.5rem;
    display: grid;
    grid-template-columns: 8rem minmax(10rem, 1fr) 9rem;
    align-items: center;
    gap: var(--space-4);
}

.tone-wavelength-comparison span,
.tone-wavelength-comparison strong {
    font-size: var(--text-xs);
}

.tone-wavelength-comparison span {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-semibold);
}

.tone-wavelength-comparison strong {
    color: var(--color-cyan);
    text-align: end;
}

.tone-wavelength-comparison p {
    margin-block-start: var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
    text-align: center;
}

.tone-waveform-guide,
.tone-practical,
.tone-related,
.tone-faq {
    padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}

.tone-spectrum-reference {
    background: color-mix(in srgb, var(--color-cyan) 2%, var(--color-surface));
}

.tone-spectrum {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1.12fr 0.88fr 1.35fr 0.78fr 0.92fr 1.2fr;
    border-block: 1px solid var(--color-border);
}

.tone-spectrum::before {
    content: "";
    position: absolute;
    inset: -1px 0 auto;
    height: 0.2rem;
    background: linear-gradient(90deg, #197aa0, var(--color-cyan) 35%, var(--color-mint) 70%, #d4fff1);
}

.tone-spectrum > div {
    min-width: 0;
    min-height: 9.5rem;
    padding: var(--space-5, 1.25rem) var(--space-3);
    display: grid;
    align-content: start;
    gap: var(--space-2);
}

.tone-spectrum > div + div {
    border-inline-start: 1px solid var(--color-border);
}

.tone-spectrum strong {
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-size: var(--text-sm);
    font-variant-numeric: tabular-nums;
}

.tone-spectrum span {
    color: var(--color-text);
    font-family: var(--font-display);
    font-size: var(--text-base);
    font-weight: var(--font-weight-bold);
}

.tone-spectrum small {
    color: var(--color-text-secondary);
    font-size: 0.68rem;
    line-height: 1.45;
}

.tone-sweep-comparison {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-block-end: 1px solid var(--color-border);
}

.tone-sweep-comparison figure {
    min-width: 0;
    padding: var(--space-5, 1.25rem) var(--space-4);
}

.tone-sweep-comparison figure:first-child {
    padding-inline-start: 0;
}

.tone-sweep-comparison figure + figure {
    border-inline-start: 1px solid var(--color-border);
}

.tone-sweep-comparison figcaption {
    display: grid;
    gap: var(--space-1);
}

.tone-sweep-comparison figcaption strong {
    color: var(--color-cyan);
    font-family: var(--font-display);
    text-transform: uppercase;
}

.tone-sweep-comparison figcaption span,
.tone-sweep-comparison p,
.tone-beat-diagram figcaption {
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
}

.tone-sweep-comparison svg {
    width: 100%;
    margin-block: var(--space-3);
    fill: none;
}

.tone-sweep-comparison .axis {
    stroke: var(--color-border);
    stroke-width: 1.5;
}

.tone-sweep-comparison .signal {
    stroke: var(--color-mint);
    stroke-linecap: round;
    stroke-width: 3;
}

.tone-beat-equation {
    padding-block: var(--space-5, 1.25rem);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    border-block-end: 1px solid var(--color-border);
}

.tone-beat-equation span {
    color: var(--color-text-secondary);
}

.tone-beat-equation .result {
    color: var(--color-cyan);
}

.tone-beat-diagram {
    padding-block: var(--space-4);
}

.tone-beat-diagram svg {
    width: 100%;
    height: 8.25rem;
    fill: none;
}

.tone-beat-diagram .wave-a,
.tone-beat-diagram .wave-b {
    stroke: color-mix(in srgb, var(--color-cyan) 72%, transparent);
    stroke-width: 1.5;
}

.tone-beat-diagram .envelope {
    stroke: var(--color-mint);
    stroke-width: 3;
}

.tone-use-chips {
    margin: 0;
    padding: var(--space-3) 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    border-block-start: 1px solid var(--color-border);
    list-style: none;
}

.tone-use-chips li {
    padding: 0.4rem 0.7rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
}

.tone-practical__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-block-start: 1px solid var(--color-border);
}

.tone-practical__grid article {
    min-width: 0;
    padding: var(--space-5, 1.25rem) var(--space-6);
    display: grid;
    grid-template-columns: 2rem minmax(0, 1fr);
    gap: var(--space-3);
    border-block-end: 1px solid var(--color-border);
}

.tone-practical__grid article:nth-child(odd) {
    padding-inline-start: 0;
    border-inline-end: 1px solid var(--color-border);
}

.tone-practical__grid article:nth-child(even) {
    padding-inline-end: 0;
}

.tone-practical__grid article > span {
    color: var(--color-cyan);
    font-family: var(--font-measurement);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-bold);
}

.tone-practical__grid h3 {
    font-size: var(--text-lg);
}

.tone-practical__grid p {
    margin-block-start: var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.tone-practical__links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.tone-practical__links a {
    color: var(--color-cyan);
    font-weight: var(--font-weight-semibold);
    text-underline-offset: 0.25em;
}

.tone-accuracy > .container {
    display: grid;
    gap: var(--space-16);
}

.tone-accuracy__chain,
.tone-safe-listening {
    display: grid;
    grid-template-columns: minmax(18rem, 0.62fr) minmax(0, 1.38fr);
    align-items: start;
    gap: clamp(var(--space-8), 6vw, var(--space-16));
}

.tone-signal-chain {
    margin: 0;
    padding: 0;
    display: flex;
    align-items: stretch;
    list-style: none;
    border-block: 1px solid var(--color-border);
}

.tone-signal-chain li {
    position: relative;
    min-width: 0;
    padding: var(--space-5, 1.25rem) var(--space-3);
    display: grid;
    place-items: center;
    flex: 1;
    color: var(--color-text-secondary);
    font-size: 0.68rem;
    font-weight: var(--font-weight-semibold);
    line-height: 1.35;
    text-align: center;
}

.tone-signal-chain li::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -0.24rem;
    z-index: 1;
    width: 0.42rem;
    height: 0.42rem;
    border-block-start: 1px solid var(--color-cyan);
    border-inline-end: 1px solid var(--color-cyan);
    transform: translateY(-50%) rotate(45deg);
}

.tone-signal-chain li:last-child {
    color: var(--color-mint);
}

.tone-signal-chain li:last-child::after {
    display: none;
}

.tone-accuracy__chain > .tone-diagram-note {
    grid-column: 2;
    margin-block-start: calc(var(--space-12) * -1);
}

.tone-safe-listening {
    padding-block-start: var(--space-12);
    border-block-start: 1px solid var(--color-border);
}

.tone-safety-principles {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-block: 1px solid var(--color-border);
}

.tone-safety-principles > div {
    padding: var(--space-5, 1.25rem);
}

.tone-safety-principles > div + div {
    border-inline-start: 1px solid var(--color-border);
}

.tone-safety-principles strong {
    color: var(--color-warning);
    font-size: 0.72rem;
    letter-spacing: 0.055em;
    text-transform: uppercase;
}

.tone-safety-principles p {
    margin-block-start: var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

@media (max-width: 70rem) {
    .tone-spectrum {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .tone-spectrum > div:nth-child(5) {
        border-inline-start: 0;
    }

    .tone-spectrum > div:nth-child(n + 5) {
        border-block-start: 1px solid var(--color-border);
    }

    .tone-accuracy__chain,
    .tone-safe-listening {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .tone-accuracy__chain > .tone-diagram-note {
        grid-column: auto;
        margin-block-start: calc(var(--space-4) * -1);
    }
}

@media (max-width: 56rem) {
    .tone-learning__pair,
    .tone-practical__grid {
        grid-template-columns: 1fr;
    }

    .tone-practical__grid article,
    .tone-practical__grid article:nth-child(odd),
    .tone-practical__grid article:nth-child(even) {
        padding-inline: 0;
        border-inline-end: 0;
    }

    .tone-use-guide__steps {
        grid-template-columns: 1fr;
    }

    .tone-use-guide__steps li,
    .tone-use-guide__steps li:first-child,
    .tone-use-guide__steps li:last-child {
        padding-inline: 0;
    }

    .tone-use-guide__steps li + li {
        border-inline-start: 0;
        border-block-start: 1px solid var(--color-border);
    }

    .tone-intro__layout--compact .tone-intro__copy {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 42rem) {
    .tone-quickstart {
        padding-block-end: var(--space-8);
    }

    .tone-use-guide > header,
    .tone-use-guide__steps,
    .tone-shortcuts {
        padding-inline: var(--space-4);
    }

    .tone-shortcuts__row {
        grid-template-columns: 4.5rem minmax(0, 1fr);
        gap: var(--space-3);
    }

    .tone-shortcuts__row > span:last-child {
        grid-column: 2;
    }

    .tone-shortcuts__row--head > span:last-child {
        display: none;
    }

    .tone-cycle-reference > div {
        grid-template-columns: 4.75rem minmax(0, 1fr);
    }

    .tone-cycle-reference svg {
        grid-column: 1 / -1;
        height: 2rem;
    }

    .tone-octave-chain {
        grid-template-columns: 1fr;
    }

    .tone-octave-chain i {
        justify-self: center;
        transform: rotate(90deg);
    }

    .tone-cents-reference,
    .tone-wavelength-comparison > div,
    .tone-sweep-comparison,
    .tone-safety-principles {
        grid-template-columns: 1fr;
    }

    .tone-cents-reference p,
    .tone-wavelength-comparison strong {
        text-align: start;
    }

    .tone-wavelength-comparison > div {
        padding-block: var(--space-3);
    }

    .tone-sweep-comparison figure,
    .tone-sweep-comparison figure:first-child {
        padding-inline: 0;
    }

    .tone-sweep-comparison figure + figure,
    .tone-safety-principles > div + div {
        border-inline-start: 0;
        border-block-start: 1px solid var(--color-border);
    }

    .tone-spectrum {
        grid-template-columns: 1fr;
    }

    .tone-spectrum > div,
    .tone-spectrum > div + div,
    .tone-spectrum > div:nth-child(5),
    .tone-spectrum > div:nth-child(n + 5) {
        min-height: 0;
        border-inline-start: 0;
        border-block-start: 1px solid var(--color-border);
    }

    .tone-spectrum > div:first-child {
        border-block-start: 0;
    }

    .tone-signal-chain {
        flex-direction: column;
    }

    .tone-signal-chain li + li {
        border-inline-start: 0;
        border-block-start: 1px solid var(--color-border);
    }

    .tone-signal-chain li::after {
        top: auto;
        right: 50%;
        bottom: -0.24rem;
        transform: translateX(50%) rotate(135deg);
    }
}