.music-tools {
    --tool-line: rgba(127, 33, 26, 0.18);
    --tool-ink: var(--app-logo-red-dark, #7F211A);
    --tool-muted: rgba(32, 23, 25, 0.68);
    --tool-surface: rgba(255, 248, 223, 0.72);
}

.music-tools__tabs {
    display: flex;
    gap: 0.45rem;
    overflow-x: auto;
    padding: 0.25rem 0 0.65rem;
    margin-bottom: 1rem;
}

.music-tools__tab {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.55rem 0.75rem;
    border: 1px solid var(--tool-line);
    border-radius: 8px;
    color: var(--tool-ink);
    background: var(--bs-body-bg);
    font-weight: 700;
    white-space: nowrap;
}

.music-tools__tab.is-active {
    color: #fff;
    background: var(--app-logo-red, #AF3925);
    border-color: var(--app-logo-red, #AF3925);
}

.music-tool-panel {
    display: none;
}

.music-tool-panel.is-active {
    display: block;
}

.music-tool-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
}

.music-tool-grid--circle {
    align-items: center;
}

.music-tool-copy,
.fretboard-shell,
.line-test-tool,
.metronome-tool,
.tuning-detail,
.tuner-tool,
.theory-card {
    padding: 1rem;
    border: 1px solid var(--tool-line);
    border-radius: 8px;
    background: var(--tool-surface);
}

.music-tool-copy h2,
.line-test-title h2,
.tuning-detail h2,
.theory-card h2 {
    color: var(--tool-ink);
}

.music-tool-copy p,
.line-test-title p,
.tuning-detail p {
    color: var(--tool-muted);
}

.music-tool-copy__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.85rem;
    flex-wrap: wrap;
}

.music-tool-copy__header h2 {
    margin-bottom: 0;
}

.music-tool-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.85rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.music-tool-panel-header h2 {
    margin-bottom: 0;
    color: var(--tool-ink);
}

.music-tool-segment {
    display: inline-flex;
    gap: 0.2rem;
    padding: 0.2rem;
    border: 1px solid var(--tool-line);
    border-radius: 8px;
    background: var(--bs-body-bg);
}

.music-tool-segment__button {
    min-height: 2rem;
    padding: 0.3rem 0.6rem;
    border: 0;
    border-radius: 6px;
    color: var(--tool-ink);
    background: transparent;
    font-size: 0.82rem;
    font-weight: 800;
    white-space: nowrap;
}

.music-tool-segment__button.is-active {
    color: #fff;
    background: var(--app-logo-red, #AF3925);
}

.circle-of-fifths {
    position: relative;
    width: min(100%, 24rem);
    aspect-ratio: 1;
    margin: 0 auto;
    border: 1px solid var(--tool-line);
    border-radius: 50%;
    background: rgba(255, 248, 223, 0.36);
}

.circle-of-fifths__key {
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.2rem;
    height: 3.2rem;
    border: 1px solid rgba(127, 33, 26, 0.28);
    border-radius: 999px;
    color: var(--tool-ink);
    background: var(--bs-body-bg);
    font-weight: 800;
    transform: rotate(var(--angle)) translate(10rem) rotate(calc(-1 * var(--angle))) translate(-50%, -50%);
}

.circle-of-fifths__degree {
    position: absolute;
    top: -0.78rem;
    left: 50%;
    min-width: 1.45rem;
    padding: 0.05rem 0.28rem;
    border: 1px solid rgba(127, 33, 26, 0.18);
    border-radius: 999px;
    color: var(--tool-muted);
    background: rgba(255, 255, 255, 0.82);
    font-size: 0.62rem;
    font-weight: 900;
    line-height: 1.1;
    transform: translateX(-50%);
}

.circle-of-fifths__degree:empty {
    display: none;
}

.circle-of-fifths__name {
    line-height: 1;
}

.circle-of-fifths__relative-key {
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.05rem;
    height: 2rem;
    border: 1px solid rgba(12, 93, 112, 0.24);
    border-radius: 999px;
    color: #0C5D70;
    background: rgba(255, 255, 255, 0.78);
    font-size: 0.78rem;
    font-weight: 800;
    transform: rotate(var(--angle)) translate(6.45rem) rotate(calc(-1 * var(--angle))) translate(-50%, -50%);
}

.circle-of-fifths__relative-key .circle-of-fifths__degree {
    top: -0.62rem;
    color: var(--tool-muted);
}

.circle-of-fifths__key.is-active,
.circle-of-fifths__relative-key.is-active {
    color: #fff;
    background: var(--app-logo-red, #AF3925);
    border-color: var(--app-logo-red, #AF3925);
}

.circle-of-fifths__key.is-active .circle-of-fifths__degree {
    border-color: rgba(175, 57, 37, 0.36);
    color: var(--app-logo-red-dark, #7F211A);
    background: rgba(255, 248, 223, 0.94);
}

.circle-of-fifths__center {
    position: absolute;
    inset: 35%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--tool-ink);
    background: rgba(255, 255, 255, 0.72);
    text-align: center;
}

.circle-of-fifths__center span {
    color: var(--tool-muted);
    font-size: 0.82rem;
}

.music-key-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
    gap: 0.65rem;
    margin: 1rem 0;
}

.music-key-summary div,
.music-degree-list span {
    padding: 0.65rem;
    border: 1px solid var(--tool-line);
    border-radius: 8px;
    background: var(--bs-body-bg);
}

.music-key-summary span,
.music-degree-list strong {
    display: block;
    color: var(--tool-muted);
    font-size: 0.8rem;
    font-weight: 800;
    text-transform: uppercase;
}

.music-degree-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(5rem, 1fr));
    gap: 0.5rem;
}

.music-tool-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.music-tool-controls label {
    display: grid;
    gap: 0.35rem;
    min-width: min(100%, 12rem);
    color: var(--tool-muted);
    font-size: 0.85rem;
    font-weight: 800;
}

.music-tool-control-group {
    display: grid;
    gap: 0.35rem;
    min-width: min(100%, 12rem);
    color: var(--tool-muted);
    font-size: 0.85rem;
    font-weight: 800;
}

.fretboard-shell {
    overflow-x: auto;
}

.fretboard {
    min-width: 52rem;
}

.fretboard__row,
.fretboard__frets {
    display: grid;
    grid-template-columns: repeat(13, minmax(3rem, 1fr));
}

.fretboard__cell {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    border-right: 2px solid rgba(127, 33, 26, 0.24);
    border-bottom: 1px solid rgba(127, 33, 26, 0.18);
    background: linear-gradient(90deg, rgba(127, 33, 26, 0.12), rgba(127, 33, 26, 0.06));
    font-weight: 800;
}

.fretboard__cell.is-active {
    color: var(--tool-ink);
    background: rgba(252, 243, 204, 0.9);
}

.fretboard__cell.is-root {
    color: #fff;
    background: var(--app-logo-red, #AF3925);
}

.fretboard__frets span {
    padding-top: 0.45rem;
    color: var(--tool-muted);
    font-size: 0.78rem;
    font-weight: 800;
    text-align: center;
}

.tunings-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
}

.tunings-list {
    display: grid;
    gap: 0.5rem;
}

.tuning-option {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem;
    border: 1px solid var(--tool-line);
    border-radius: 8px;
    color: var(--tool-ink);
    background: var(--bs-body-bg);
    text-align: left;
}

.tuning-option span {
    color: var(--tool-muted);
}

.tuning-option.is-active {
    border-color: rgba(175, 57, 37, 0.48);
    background: rgba(252, 243, 204, 0.64);
}

.tuning-detail__header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

.tuning-detail__header i {
    color: var(--app-logo-red, #AF3925);
    font-size: 2rem;
}

.tuning-strings {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0.5rem;
    margin-top: 1rem;
}

.tuning-strings span {
    display: grid;
    place-items: center;
    min-height: 4rem;
    border: 1px solid var(--tool-line);
    border-radius: 8px;
    background: var(--bs-body-bg);
}

.tuning-strings strong {
    color: var(--tool-ink);
    font-size: 1.2rem;
}

.tuning-strings small {
    color: var(--tool-muted);
    font-weight: 800;
}

.tuner-tool {
    max-width: 36rem;
    margin: 0 auto;
}

.tuner-target-panel {
    display: grid;
    gap: 0.65rem;
    margin-bottom: 1rem;
}

.tuner-target-panel__label {
    color: var(--tool-muted);
    font-size: 0.85rem;
    font-weight: 800;
    text-align: center;
}

.tuner-string-targets {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(5.6rem, 1fr));
    gap: 0.5rem;
}

.tuner-string-target {
    display: grid;
    gap: 0.12rem;
    min-height: 3.7rem;
    padding: 0.55rem;
    border: 1px solid var(--tool-line);
    border-radius: 8px;
    color: var(--tool-ink);
    background: var(--bs-body-bg);
}

.tuner-string-target strong {
    font-size: 1.08rem;
}

.tuner-string-target small {
    color: var(--tool-muted);
    font-weight: 800;
}

.tuner-string-target.is-active {
    color: #fff;
    background: var(--app-logo-red, #AF3925);
    border-color: var(--app-logo-red, #AF3925);
}

.tuner-string-target.is-active small {
    color: rgba(255, 255, 255, 0.78);
}

.tuner-meter {
    display: grid;
    gap: 0.75rem;
    margin-bottom: 1rem;
    text-align: center;
}

.tuner-meter__note {
    color: var(--tool-ink);
    font-size: clamp(3rem, 14vw, 6rem);
    font-weight: 900;
    line-height: 1;
}

.tuner-meter__freq,
.tuner-meter__cents {
    color: var(--tool-muted);
    font-weight: 800;
}

.tuner-meter__rail {
    position: relative;
    height: 0.6rem;
    margin: 0.5rem 1rem;
    border-radius: 999px;
    background: linear-gradient(90deg, #0C5D70, #FCF3CC, #AF3925);
}

.tuner-meter__rail span {
    position: absolute;
    top: -0.45rem;
    bottom: -0.45rem;
    left: 50%;
    width: 2px;
    background: var(--tool-ink);
}

.tuner-meter__rail i {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 1rem;
    height: 1rem;
    border-radius: 999px;
    background: var(--tool-ink);
    transform: translate(-50%, -50%);
}

.metronome-tool {
    max-width: 42rem;
    margin: 0 auto;
}

.metronome-display {
    display: grid;
    gap: 1rem;
    margin-bottom: 1rem;
    text-align: center;
}

.metronome-display__tempo strong {
    display: block;
    color: var(--tool-ink);
    font-size: clamp(3rem, 14vw, 6rem);
    font-weight: 900;
    line-height: 1;
}

.metronome-display__tempo span {
    color: var(--tool-muted);
    font-weight: 900;
    letter-spacing: 0.08em;
}

.metronome-beats {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.metronome-beats__dot {
    width: 1rem;
    height: 1rem;
    border: 1px solid rgba(127, 33, 26, 0.28);
    border-radius: 999px;
    background: var(--bs-body-bg);
}

.metronome-beats__dot.is-active {
    background: var(--app-logo-red, #AF3925);
    border-color: var(--app-logo-red, #AF3925);
    transform: scale(1.2);
}

.metronome-controls {
    justify-content: center;
}

.metronome-controls label:first-child {
    flex: 1 1 18rem;
}

.line-test-tool {
    max-width: 58rem;
    margin: 0 auto;
}

.line-test-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.line-test-title {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
}

.line-test-title > span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    width: 2.7rem;
    height: 2.7rem;
    border: 1px solid rgba(12, 93, 112, 0.24);
    border-radius: 8px;
    color: #0C5D70;
    background: rgba(12, 93, 112, 0.1);
    font-size: 1.45rem;
}

.line-test-title h2,
.line-test-title p {
    margin-bottom: 0;
}

.line-test-readout {
    display: grid;
    align-content: center;
    justify-items: start;
    min-width: 9rem;
    padding: 0.65rem 0.8rem;
    border: 1px solid var(--tool-line);
    border-radius: 8px;
    background: var(--bs-body-bg);
}

.line-test-readout span,
.line-test-gain-value,
.line-test-status small,
.line-test-station span {
    color: var(--tool-muted);
    font-size: 0.8rem;
    font-weight: 800;
}

.line-test-readout strong {
    color: var(--tool-ink);
    font-size: 1.35rem;
    line-height: 1;
}

.line-test-scope {
    position: relative;
    min-height: 14rem;
    margin-bottom: 1rem;
    overflow: hidden;
    border: 1px solid rgba(12, 93, 112, 0.26);
    border-radius: 8px;
    background:
        linear-gradient(135deg, rgba(12, 93, 112, 0.2), rgba(252, 243, 204, 0.34) 48%, rgba(175, 57, 37, 0.14)),
        var(--bs-body-bg);
}

.line-test-grid {
    position: absolute;
    inset: 0;
    opacity: 0.42;
    background-image:
        linear-gradient(rgba(12, 93, 112, 0.14) 1px, transparent 1px),
        linear-gradient(90deg, rgba(12, 93, 112, 0.14) 1px, transparent 1px);
    background-size: 2rem 2rem;
}

.line-test-wave {
    position: absolute;
    inset: 2rem 1.2rem 3.6rem;
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: center;
    gap: 0.35rem;
}

.line-test-wave span {
    display: block;
    height: 100%;
    min-height: 3rem;
    border-radius: 999px;
    background: linear-gradient(180deg, #0C5D70, #FCF3CC, #AF3925);
    opacity: 0.5;
    transform: scaleY(0.28);
    transform-origin: center;
}

.line-test-wave span:nth-child(2n) {
    transform: scaleY(0.46);
}

.line-test-wave span:nth-child(3n) {
    transform: scaleY(0.68);
}

.line-test-scope.is-sending .line-test-wave span,
.line-test-scope.is-listening .line-test-wave span {
    animation: line-test-wave 0.95s ease-in-out infinite;
}

.line-test-scope.is-sending .line-test-wave span:nth-child(2n),
.line-test-scope.is-listening .line-test-wave span:nth-child(2n) {
    animation-delay: 0.11s;
}

.line-test-scope.is-sending .line-test-wave span:nth-child(3n),
.line-test-scope.is-listening .line-test-wave span:nth-child(3n) {
    animation-delay: 0.22s;
}

.line-test-scope.is-locked {
    border-color: rgba(12, 93, 112, 0.56);
    box-shadow: inset 0 0 0 2px rgba(12, 93, 112, 0.1);
}

.line-test-meter {
    position: absolute;
    right: 1.2rem;
    bottom: 1.25rem;
    left: 1.2rem;
    height: 0.75rem;
    overflow: hidden;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.68);
}

.line-test-meter i {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #AF3925, #FCF3CC, #0C5D70);
    transition: width 140ms ease;
}

.line-test-controls {
    align-items: end;
    justify-content: center;
}

.line-test-controls label:nth-child(2) {
    flex: 1 1 18rem;
}

.line-test-console {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.75rem;
}

.line-test-station,
.line-test-status {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    min-height: 4.2rem;
    padding: 0.75rem;
    border: 1px solid var(--tool-line);
    border-radius: 8px;
    background: var(--bs-body-bg);
}

.line-test-status {
    display: grid;
    grid-template-columns: 1fr auto;
}

.line-test-status span {
    color: var(--tool-ink);
    font-weight: 900;
}

.line-test-status strong {
    color: #0C5D70;
    font-size: 1.45rem;
    line-height: 1;
}

.line-test-status small {
    grid-column: 1 / -1;
}

@keyframes line-test-wave {
    0%,
    100% {
        transform: scaleY(0.24);
    }

    50% {
        transform: scaleY(0.9);
    }
}

.theory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
    gap: 1rem;
}

.theory-card dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.55rem 1rem;
    margin: 0;
}

.theory-card dt {
    color: var(--tool-ink);
}

.theory-card dd {
    margin: 0;
    color: var(--tool-muted);
}

[data-bs-theme="dark"] .music-tools {
    --tool-line: rgba(252, 243, 204, 0.18);
    --tool-muted: rgba(246, 243, 237, 0.72);
    --tool-surface: rgba(36, 31, 33, 0.86);
}

[data-bs-theme="dark"] .circle-of-fifths__center {
    background: rgba(27, 31, 36, 0.76);
}

[data-bs-theme="dark"] .circle-of-fifths {
    background: rgba(36, 31, 33, 0.58);
}

[data-bs-theme="dark"] .circle-of-fifths__relative-key {
    color: #B8ECF5;
    background: rgba(27, 31, 36, 0.78);
}

[data-bs-theme="dark"] .circle-of-fifths__degree {
    color: rgba(246, 243, 237, 0.74);
    background: rgba(27, 31, 36, 0.84);
}

[data-bs-theme="dark"] .circle-of-fifths__key.is-active .circle-of-fifths__degree {
    color: #FCF3CC;
    background: rgba(127, 33, 26, 0.94);
}

[data-bs-theme="dark"] .circle-of-fifths__relative-key.is-active {
    color: #fff;
    background: var(--app-logo-red, #AF3925);
}

[data-bs-theme="dark"] .line-test-scope {
    background:
        linear-gradient(135deg, rgba(12, 93, 112, 0.28), rgba(252, 243, 204, 0.1) 48%, rgba(175, 57, 37, 0.2)),
        rgba(27, 31, 36, 0.74);
}

[data-bs-theme="dark"] .line-test-meter {
    background: rgba(27, 31, 36, 0.7);
}

@media (min-width: 992px) {
    .music-tool-grid--circle {
        grid-template-columns: minmax(0, 1fr) minmax(22rem, 24rem);
    }

    .tunings-layout {
        grid-template-columns: minmax(16rem, 0.8fr) minmax(0, 1.2fr);
    }

    .line-test-header {
        grid-template-columns: minmax(0, 1fr) auto;
        align-items: start;
    }

    .line-test-console {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(12rem, 0.8fr);
    }
}

@media (max-width: 575.98px) {
    .circle-of-fifths__key {
        width: 2.65rem;
        height: 2.65rem;
        transform: rotate(var(--angle)) translate(8.1rem) rotate(calc(-1 * var(--angle))) translate(-50%, -50%);
    }

    .circle-of-fifths__degree {
        top: -0.62rem;
        min-width: 1.25rem;
        padding: 0.04rem 0.2rem;
        font-size: 0.56rem;
    }

    .circle-of-fifths__relative-key {
        width: 2.55rem;
        height: 1.8rem;
        font-size: 0.72rem;
        transform: rotate(var(--angle)) translate(5.25rem) rotate(calc(-1 * var(--angle))) translate(-50%, -50%);
    }

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

    .line-test-title {
        align-items: center;
    }

    .line-test-scope {
        min-height: 11rem;
    }

    .line-test-station {
        align-items: stretch;
        flex-direction: column;
    }

    .line-test-station .btn {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .line-test-scope.is-sending .line-test-wave span,
    .line-test-scope.is-listening .line-test-wave span {
        animation: none;
    }
}