:root {
    color-scheme: dark;
    --bg: #0b0d12;
    --panel: #10141b;
    --panel-2: #151a22;
    --panel-3: #1a202a;
    --border: #262d38;
    --border-strong: #343d4a;
    --text: #f2f4f8;
    --muted: #8d96a5;
    --muted-2: #667181;
    --accent: #9a8cff;
    --accent-strong: #b4aaff;
    --accent-soft: rgba(154, 140, 255, 0.14);
    --cyan: #65c7e5;
    --cyan-soft: rgba(101, 199, 229, 0.13);
    --pink: #ef8da7;
    --pink-soft: rgba(239, 141, 167, 0.18);
    --green: #75d69c;
    --radius: 14px;
    --radius-sm: 10px;
    --shadow: 0 18px 70px rgba(0, 0, 0, 0.22);
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    background: var(--bg);
}

body {
    margin: 0;
    min-width: 320px;
    min-height: 100vh;
    background:
        radial-gradient(circle at 10% 0%, rgba(154, 140, 255, 0.08), transparent 34rem),
        radial-gradient(circle at 92% 8%, rgba(101, 199, 229, 0.06), transparent 28rem),
        var(--bg);
    color: var(--text);
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.45;
}

button,
select,
input {
    font: inherit;
}

button,
select {
    min-height: 44px;
}

button {
    -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
select:focus-visible,
input:focus-visible,
.fretboard-scroll:focus-visible {
    outline: 2px solid var(--accent-strong);
    outline-offset: 2px;
}

.app-shell {
    width: min(1500px, calc(100% - 32px));
    margin: 0 auto;
    padding: 34px 0 28px;
}

.hero {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    padding: 4px 0 28px;
    border-bottom: 1px solid var(--border);
}

.hero-copy {
    min-width: 0;
}

.eyebrow,
.control-label,
.control-card > label,
.meta-label {
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 0.69rem;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--cyan);
}

h1 {
    margin: 0;
    max-width: 760px;
    font-size: clamp(2.25rem, 7vw, 5.2rem);
    line-height: 0.94;
    letter-spacing: -0.055em;
}

h1 span {
    color: #7d8796;
}

.lede {
    max-width: 700px;
    margin: 18px 0 0;
    color: var(--muted);
    font-size: clamp(0.92rem, 1.8vw, 1.05rem);
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    min-height: 44px;
    padding: 0 15px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    color: var(--text);
    cursor: pointer;
    transition: border-color 120ms ease, background-color 120ms ease, transform 120ms ease;
}

.button:hover {
    border-color: #566174;
}

.button:active {
    transform: translateY(1px);
}

.button-primary {
    border-color: rgba(154, 140, 255, 0.58);
    background: linear-gradient(180deg, rgba(154, 140, 255, 0.2), rgba(154, 140, 255, 0.1));
}

.button-primary:hover {
    border-color: var(--accent-strong);
    background: linear-gradient(180deg, rgba(154, 140, 255, 0.28), rgba(154, 140, 255, 0.13));
}

.button-secondary {
    background: var(--panel-2);
}

.button.fill {
    width: 100%;
}

.export-button {
    flex: 0 0 auto;
    white-space: nowrap;
    font-weight: 700;
}

.export-button svg {
    width: 17px;
    height: 17px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.control-grid {
    display: grid;
    grid-template-columns: minmax(190px, 1.45fr) repeat(5, minmax(135px, 1fr));
    gap: 10px;
    padding: 18px 0;
}

.control-card {
    min-width: 0;
    padding: 11px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.018), transparent), var(--panel);
}

.control-card > label,
.control-label {
    display: block;
    margin: 0 0 8px;
    color: var(--muted-2);
}

select {
    width: 100%;
    max-width: 100%;
    padding: 0 35px 0 11px;
    border: 1px solid var(--border-strong);
    border-radius: 9px;
    background-color: var(--panel-2);
    color: var(--text);
}

.segmented {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3px;
    padding: 3px;
    border: 1px solid var(--border-strong);
    border-radius: 9px;
    background: var(--panel-2);
}

.segmented button {
    min-width: 0;
    padding: 0 8px;
    border: 0;
    border-radius: 7px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
}

.segmented button.is-active {
    background: var(--panel-3);
    color: var(--text);
    box-shadow: inset 0 0 0 1px var(--border-strong);
}

.check-row {
    display: flex !important;
    align-items: center;
    gap: 9px;
    min-height: 44px;
    margin: 0 !important;
    padding: 0 10px;
    border: 1px solid var(--border-strong);
    border-radius: 9px;
    background: var(--panel-2);
    color: var(--muted) !important;
    letter-spacing: normal !important;
    text-transform: none !important;
    font-family: inherit !important;
    font-size: 0.82rem !important;
    cursor: pointer;
}

.check-row input {
    flex: 0 0 auto;
    width: 17px;
    height: 17px;
    margin: 0;
    accent-color: var(--accent);
}

.scale-controls {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    padding: 0 0 18px;
}

.scale-controls[hidden],
.custom-panel[hidden] {
    display: none;
}

.status-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    flex-wrap: wrap;
    padding: 2px 0 14px;
}

.tuning-summary {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.tuning-summary strong {
    display: block;
    margin-top: 2px;
    font-size: 1.02rem;
}

.meta-label {
    display: block;
    color: var(--muted-2);
}

.note-pills {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.note-pill {
    display: inline-flex;
    align-items: baseline;
    justify-content: center;
    min-width: 32px;
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--panel-2);
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 0.74rem;
    font-weight: 700;
}

.note-pill small {
    margin-left: 1px;
    color: var(--muted);
    font-size: 0.55rem;
}

.scale-summary {
    color: var(--cyan);
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 0.76rem;
}

.fretboard-panel {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: rgba(16, 20, 27, 0.94);
    box-shadow: var(--shadow);
}

.fretboard-scroll {
    max-width: 100%;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    padding: 15px 14px 10px;
    scrollbar-width: thin;
    scrollbar-color: #3b4554 transparent;
}

.fretboard {
    --fret-cell: 47px;
    --label-cell: 58px;
    width: max-content;
    min-width: 100%;
}

.fret-row,
.marker-row,
.string-row {
    display: grid;
    grid-template-columns: var(--label-cell) repeat(var(--fret-count), var(--fret-cell));
    width: max-content;
    min-width: 100%;
}

.fret-label {
    display: grid;
    place-items: center;
    height: 28px;
    color: var(--muted-2);
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 0.63rem;
}

.fret-label.landmark {
    color: var(--text);
    font-weight: 800;
}

.string-row {
    position: relative;
}

.string-row::after {
    content: "";
    position: absolute;
    z-index: 0;
    top: 50%;
    left: calc(var(--label-cell) / 2);
    right: 0;
    height: var(--string-thickness, 1px);
    transform: translateY(-50%);
    background: linear-gradient(90deg, #747d8b, #4f5866);
    opacity: 0.78;
    pointer-events: none;
}

.note-cell {
    position: relative;
    display: grid;
    place-items: center;
    height: 49px;
    border-left: 1px solid var(--border);
}

.note-cell.open-cell {
    border-left: 0;
    border-right: 3px solid #7d8796;
}

.note-dot {
    position: relative;
    z-index: 2;
    display: grid;
    place-items: center;
    width: 29px;
    height: 29px;
    border: 1px solid #697384;
    border-radius: 50%;
    background: #121720;
    color: var(--text);
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 0.67rem;
    font-weight: 800;
    transition: opacity 120ms ease, transform 120ms ease, background-color 120ms ease, border-color 120ms ease;
}

.note-dot.accidental-note {
    border-color: rgba(101, 199, 229, 0.75);
    background: var(--cyan-soft);
    color: #b9edfb;
}

.note-dot.scale-note {
    border-color: rgba(154, 140, 255, 0.9);
    background: var(--accent-soft);
    color: #e5e1ff;
}

.note-dot.root-note {
    border-color: rgba(239, 141, 167, 0.95);
    background: var(--pink-soft);
    color: #ffe1e9;
    box-shadow: 0 0 0 2px rgba(239, 141, 167, 0.1);
}

.note-dot.dimmed-note {
    opacity: 0.14;
}

.note-dot .octave-number {
    position: absolute;
    right: -5px;
    bottom: -4px;
    color: var(--muted);
    font-size: 0.48rem;
}

.marker-cell {
    display: grid;
    place-items: center;
    height: 16px;
}

.marker-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--muted-2);
    opacity: 0.6;
}

.double-marker {
    display: flex;
    gap: 4px;
}

.legend {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding: 11px 14px;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.71rem;
}

.legend span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.legend-dot {
    width: 9px;
    height: 9px;
    border: 1px solid #697384;
    border-radius: 50%;
    background: #121720;
}

.legend-dot.accidental {
    border-color: var(--cyan);
    background: var(--cyan-soft);
}

.legend-dot.scale {
    border-color: var(--accent);
    background: var(--accent-soft);
}

.legend-dot.root {
    border-color: var(--pink);
    background: var(--pink-soft);
}

.legend-scroll {
    margin-left: auto;
}

.custom-panel {
    margin-top: 16px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--panel);
}

.custom-header {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 14px;
}

.custom-header h2 {
    margin: 3px 0 3px;
    font-size: 1.15rem;
}

.custom-header p {
    margin: 0;
    color: var(--muted);
    font-size: 0.84rem;
}

.custom-string-list {
    display: grid;
    gap: 8px;
}

.custom-string-row {
    display: grid;
    grid-template-columns: minmax(78px, 0.75fr) minmax(110px, 1fr) minmax(120px, 1fr);
    gap: 8px;
    align-items: center;
}

.custom-string-row .string-name {
    color: var(--muted);
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 0.7rem;
}

.custom-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.form-message {
    min-height: 1.35em;
    margin: 10px 0 0;
    color: var(--pink);
    font-size: 0.78rem;
}

.footer {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
    padding: 18px 2px 0;
    color: var(--muted-2);
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 0.64rem;
}

@media (max-width: 1120px) {
    .control-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .control-wide {
        grid-column: span 2;
    }
}

@media (max-width: 720px) {
    .app-shell {
        width: min(100% - 20px, 1500px);
        padding-top: 20px;
    }

    .hero {
        align-items: stretch;
        flex-direction: column;
        gap: 18px;
    }

    .export-button {
        width: 100%;
    }

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

    .control-wide {
        grid-column: 1 / -1;
    }

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

    .scale-controls .control-card:last-child {
        grid-column: 1 / -1;
    }

    .legend-scroll {
        width: 100%;
        margin-left: 0;
    }

    .custom-string-row {
        grid-template-columns: 66px minmax(0, 1fr) minmax(0, 1fr);
    }
}

@media (max-width: 430px) {
    .control-grid,
    .scale-controls {
        grid-template-columns: 1fr;
    }

    .control-wide,
    .scale-controls .control-card:last-child {
        grid-column: auto;
    }

    .custom-header {
        flex-direction: column;
    }

    .custom-header .button {
        width: 100%;
    }

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

    .custom-string-row .string-name {
        grid-column: 1 / -1;
    }

    .custom-actions .button {
        flex: 1 1 130px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.001ms !important;
    }
}

@media print {
    body {
        background: #fff;
        color: #111;
    }

    .hero,
    .control-grid,
    .scale-controls,
    .custom-panel,
    .footer,
    .legend {
        display: none !important;
    }

    .app-shell {
        width: 100%;
        margin: 0;
        padding: 0;
    }

    .fretboard-panel {
        border: 0;
        box-shadow: none;
    }

    .fretboard-scroll {
        overflow: visible;
    }
}