/* ============================================================
   Fundamental Frequency Finder — Tool Styles (Best-in-Class)
   ============================================================ */

/* ── Giant F0 Display ── */
.f0-display {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-lg) 0 0;
    position: relative;
}

.f0-display__freq {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 9vw, 5.5rem);
    color: var(--color-primary);
    text-shadow: 0 0 24px rgba(0, 255, 65, 0.5);
    line-height: 1;
    letter-spacing: 0.05em;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

.f0-display__unit {
    font-family: var(--font-mono);
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--color-text-muted);
    line-height: 1;
}

.f0-display__note {
    text-align: center;
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    color: var(--color-secondary);
    text-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
    margin-top: var(--space-xs);
}

.f0-display__sub {
    text-align: center;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    margin-top: 2px;
}

/* ── Confidence Meter ── */
.confidence-meter {
    margin-top: var(--space-sm);
}

.confidence-meter__title {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 4px;
}

.confidence-meter__bar {
    position: relative;
    height: 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.confidence-meter__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-error), var(--color-warning), var(--color-primary));
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

.confidence-meter__label {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-bright);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
    pointer-events: none;
}

/* ── THD Display ── */
.thd-display {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-sm);
    padding: var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.thd-display__item {
    flex: 1;
    text-align: center;
}

.thd-display__label {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.thd-display__value {
    font-family: var(--font-display);
    font-size: var(--fs-md);
    color: var(--color-primary);
    margin-top: 2px;
}

/* ── Instrument ID Badge ── */
.instrument-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: var(--space-sm);
    padding: 6px 14px;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-secondary);
    background: rgba(0, 229, 255, 0.08);
    border: 1px solid rgba(0, 229, 255, 0.25);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ── Audio File Upload ── */
.upload-zone {
    margin-bottom: var(--space-sm);
    padding: var(--space-md);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    position: relative;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--color-primary);
    background: rgba(0, 255, 65, 0.03);
}

.upload-zone__icon {
    font-size: 2rem;
    margin-bottom: var(--space-xs);
}

.upload-zone__text {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
}

.upload-zone__text strong {
    color: var(--color-primary);
}

.upload-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.upload-progress {
    display: none;
    margin-top: var(--space-xs);
}

.upload-progress.active {
    display: block;
}

.upload-progress__bar {
    height: 4px;
    background: var(--color-surface);
    border-radius: 2px;
    overflow: hidden;
}

.upload-progress__fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: 2px;
    transition: width 0.3s;
    box-shadow: 0 0 8px rgba(0, 255, 65, 0.5);
}

.upload-progress__text {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    margin-top: 4px;
    text-align: center;
}

/* ── Canvas Wrappers ── */
.spectrum-wrap,
.spectrogram-wrap,
.waveform-wrap {
    width: 100%;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
}

.spectrum-wrap {
    height: 260px;
}

.spectrogram-wrap {
    height: 180px;
}

.waveform-wrap {
    height: 120px;
}

.spectrum-wrap canvas,
.spectrogram-wrap canvas,
.waveform-wrap canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* ── Harmonics Table ── */
.harmonics-table-wrap {
    max-height: 320px;
    overflow-y: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-top: var(--space-xs);
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--color-surface);
}

.harmonics-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
}

.harmonics-table thead {
    position: sticky;
    top: 0;
    z-index: 1;
}

.harmonics-table th {
    background: var(--color-surface);
    color: var(--color-secondary);
    padding: 6px var(--space-sm);
    text-align: left;
    font-weight: 600;
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border);
}

.harmonics-table td {
    padding: 5px var(--space-sm);
    border-bottom: 1px solid rgba(15, 61, 30, 0.2);
    color: var(--color-text);
}

.harmonics-table tr {
    cursor: pointer;
    transition: background 0.15s;
}

.harmonics-table tr:hover td {
    background: rgba(0, 255, 65, 0.03);
}

.harmonics-table .harmonic-f0 td {
    color: var(--color-primary);
    font-weight: 700;
    background: rgba(0, 255, 65, 0.05);
}

.harmonics-table tr.muted td {
    opacity: 0.35;
    text-decoration: line-through;
}

.harmonics-table tr.soloed td {
    background: rgba(0, 229, 255, 0.08);
    border-left: 2px solid var(--color-secondary);
}

.harmonic-bar {
    display: inline-block;
    height: 10px;
    background: var(--color-primary);
    border-radius: 2px;
    vertical-align: middle;
    margin-left: 4px;
    box-shadow: 0 0 4px rgba(0, 255, 65, 0.3);
    transition: width 0.3s ease;
}

.mute-solo-btns {
    display: inline-flex;
    gap: 2px;
}

.mute-solo-btns button {
    padding: 1px 5px;
    font-size: 0.55rem;
    font-family: var(--font-mono);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 3px;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all 0.15s;
}

.mute-solo-btns button:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.mute-solo-btns button.active {
    background: rgba(0, 255, 65, 0.15);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ── Harmonic Profile Bars ── */
.profile-bars {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 100px;
    margin-top: var(--space-xs);
    padding: var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.profile-bar {
    flex: 1;
    min-width: 12px;
    background: linear-gradient(to top, var(--color-primary), rgba(0, 255, 65, 0.3));
    border-radius: 2px 2px 0 0;
    transition: height 0.3s ease, opacity 0.2s;
    position: relative;
    cursor: pointer;
}

.profile-bar:hover {
    background: linear-gradient(to top, #00e676, rgba(0, 230, 118, 0.5));
    box-shadow: 0 0 8px rgba(0, 255, 65, 0.4);
}

.profile-bar.muted {
    opacity: 0.15;
}

.profile-bar__label {
    position: absolute;
    bottom: -16px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.5rem;
    color: var(--color-text-muted);
    white-space: nowrap;
}

/* ── Snapshot Comparison ── */
.snapshot-controls {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-xs);
    align-items: center;
}

.snapshot-compare {
    display: none;
    margin-top: var(--space-sm);
}

.snapshot-compare.active {
    display: block;
}

.snapshot-bars {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 80px;
    padding: var(--space-sm);
    background: var(--color-surface);
    border: 1px solid rgba(0, 229, 255, 0.2);
    border-radius: var(--radius-md);
}

.snapshot-bar {
    flex: 1;
    min-width: 12px;
    background: linear-gradient(to top, var(--color-secondary), rgba(0, 229, 255, 0.3));
    border-radius: 2px 2px 0 0;
    opacity: 0.6;
}

.snapshot-label {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-secondary);
    margin-bottom: 4px;
}

/* ── Missing Fundamental Demo ── */
.missing-f0-demo {
    margin-top: var(--space-sm);
    padding: var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.missing-f0-demo__title {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

.missing-f0-demo__desc {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.missing-f0-demo__btns {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* ── Wavelength Visual ── */
.wavelength-visual {
    margin-top: var(--space-sm);
    padding: var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.wavelength-visual__bar-wrap {
    position: relative;
    height: 24px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-top: var(--space-xs);
}

.wavelength-visual__bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-sm);
    transition: width 0.3s;
    box-shadow: 0 0 8px rgba(0, 255, 65, 0.3);
}

.wavelength-visual__label {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    margin-top: 4px;
}

.wavelength-visual__comparison {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-secondary);
    margin-top: 2px;
}

/* ── Calculator Tabs ── */
.calc-tabs {
    display: flex;
    gap: 2px;
    margin-bottom: var(--space-sm);
}

.calc-tab {
    flex: 1;
    padding: 8px 4px;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.calc-tab:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.calc-tab.active {
    color: var(--color-primary);
    background: rgba(0, 255, 65, 0.08);
    border-color: var(--color-primary);
    border-bottom-color: transparent;
}

.calc-panel {
    display: none;
    padding: var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.calc-panel.active {
    display: block;
}

.calc-input-row {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    flex-wrap: wrap;
    align-items: flex-end;
}

.calc-field {
    flex: 1;
    min-width: 120px;
}

.calc-field label {
    display: block;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.calc-field input,
.calc-field select {
    width: 100%;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    color: var(--color-primary);
}

.calc-field input:focus,
.calc-field select:focus {
    border-color: var(--color-primary);
    box-shadow: var(--glow-sm);
    outline: none;
}

.calc-result {
    margin-top: var(--space-sm);
    padding: var(--space-sm);
    background: rgba(0, 255, 65, 0.04);
    border: 1px solid rgba(0, 255, 65, 0.15);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    color: var(--color-primary);
}

/* ── Tone Playback Controls ── */
.tone-controls {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    align-items: center;
    margin-top: var(--space-sm);
    padding: var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.tone-controls__label {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-secondary);
    text-transform: uppercase;
    white-space: nowrap;
}

.tone-controls input[type="range"] {
    flex: 1;
    max-width: 120px;
}

/* ── Controls Grid ── */
.controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.control-group {
    padding: var(--space-xs);
}

.control-group__label {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.control-group__value {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-primary);
}

.control-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

/* ── Tool Grid Layout ── */
.tool-grid {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: var(--space-md);
}

.tool-panel {
    min-width: 0;
}

.tool-panel__title {
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-xs);
}

.tool-panel__subtitle {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    font-weight: 400;
}

/* ── Stat boxes ── */
.stat-box {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    text-align: center;
}

.stat-box__label {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
}

.stat-box__value {
    font-family: var(--font-display);
    font-size: var(--fs-md);
    color: var(--color-primary);
}

/* ── Export / Hold / Misc ── */
.export-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.select {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text);
}

.select:focus {
    border-color: var(--color-primary);
    outline: none;
}

.hold-badge {
    display: none;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-secondary);
    background: rgba(0, 229, 255, 0.1);
    border: 1px solid var(--color-secondary);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    animation: holdPulse 1.5s ease-in-out infinite;
}

.hold-badge.active {
    display: inline-flex;
}

@keyframes holdPulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.mic-active {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    margin-right: 6px;
    animation: micPulse 1s ease-in-out infinite;
}

@keyframes micPulse {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(0, 255, 65, 0.6);
    }

    50% {
        box-shadow: 0 0 0 6px rgba(0, 255, 65, 0);
    }
}

.tuning-input {
    width: 70px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    color: var(--color-primary);
    text-align: center;
}

.tuning-input:focus {
    border-color: var(--color-primary);
    box-shadow: var(--glow-sm);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 6px rgba(0, 255, 65, 0.5);
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 6px rgba(0, 255, 65, 0.5);
}

.history-wrap {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-top: var(--space-sm);
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
}

.history-table thead {
    position: sticky;
    top: 0;
    z-index: 1;
}

.history-table th {
    background: var(--color-surface);
    color: var(--color-secondary);
    padding: 6px var(--space-sm);
    text-align: left;
    font-weight: 600;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border);
}

.history-table td {
    padding: 4px var(--space-sm);
    border-bottom: 1px solid rgba(15, 61, 30, 0.2);
    color: var(--color-text);
}

/* ── Privacy Callout ── */
.privacy-callout {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    padding: 10px var(--space-md);
    margin-bottom: var(--space-md);
    background: rgba(0, 255, 65, 0.04);
    border: 1px solid rgba(0, 255, 65, 0.15);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
}

.privacy-callout__icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.browser-badges {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-left: auto;
}

.browser-badge {
    padding: 2px 8px;
    font-family: var(--font-mono);
    font-size: 0.6rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ── Keyboard Shortcut Hints (multi-hint row) ── */
.kbd-hints {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: var(--space-xs);
    justify-content: center;
}

.kbd-hint {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.kbd-hint kbd {
    display: inline-block;
    padding: 1px 6px;
    border: 1px solid var(--color-border);
    border-radius: 3px;
    background: var(--color-surface);
    font-size: 0.65rem;
    color: var(--color-primary);
}

/* ── Octave Correction Buttons ── */
.octave-btns {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    margin: var(--space-xs) 0;
}

/* ── Responsive ── */
@media (max-width: 900px) {
    .tool-grid {
        grid-template-columns: 1fr;
    }

    .f0-display__freq {
        font-size: 3rem;
    }

    .spectrum-wrap {
        height: 200px;
    }

    .spectrogram-wrap {
        height: 140px;
    }

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

    .thd-display {
        flex-direction: column;
        gap: var(--space-xs);
    }
}

@media (max-width: 480px) {
    .controls-grid {
        grid-template-columns: 1fr;
    }

    .calc-tabs {
        flex-wrap: wrap;
    }

    .calc-tab {
        font-size: 0.55rem;
    }

    .profile-bars {
        height: 70px;
    }

    .tone-controls {
        flex-direction: column;
        align-items: flex-start;
    }

    .missing-f0-demo__btns {
        flex-direction: column;
    }
}