/* Baseline chrome + themable tokens. Themes (themes/*.css) override these. */

*, *::before, *::after { box-sizing: border-box; }

:root {
    --accent: #4ade80;

    --viz-primary:   #00a1ce;
    --viz-secondary: #00ffff;
    --viz-glow:      rgba(136, 136, 255, 0.5);
    --viz-grid:      rgba(136, 255, 255, 0.5);
    --viz-grid-soft: rgba(136, 255, 255, 0.3);

    --viz-canvas-bg: var(--tracker-bg);
    --viz-ink:       #ffffff;

    --viz-vol-cold: 136, 136, 255;
    --viz-vol-mid:  136, 255, 255;
    --viz-vol-hot:  255,  64,  64;

    --vu-low:  #4ade80;
    --vu-mid:  #facc15;
    --vu-high: #ef4444;

    --tracker-bg            : #2a2a2a;
    --tracker-bg-alt        : #1a1a1a;
    --tracker-row-highlight : #4a4a4a;
    --tracker-fg            : #ffffff;
    --tracker-note          : #8888FF;
    --tracker-sample        : #88FFFF;
    --tracker-volume        : #AA44CC;
    --tracker-effect        : #88FF88;
}

html, body {
    margin: 0;
    padding: 0;
    background: #111827;
    color: #ffffff;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body { overflow: hidden; }

.app {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}
.app-header h1 a {
    color: inherit;
    text-decoration: none;
    transition: opacity 0.15s ease;
}
.app-header h1 a:hover,
.app-header h1 a:focus-visible {
    opacity: 0.7;
}

/* ========== Module info row ========== */

.mod-info {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.mod-info-box {
    background: #2a2a2a;
    border: 2px solid #4a4a4a;
    border-radius: 4px;
    padding: 8px;
    font-family: monospace;
    font-size: 12px;
    color: #ffffff;
    min-width: 164px;
    text-align: center;
    box-shadow: 2px 2px 0 #000;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    flex: 1;
}

.mod-info-box:hover {
    transform: translate(-1px, -1px);
    box-shadow: 3px 3px 0 #000;
    border-color: #d2d2d2;
}

.mod-info-box span {
    display: block;
    font-weight: bold;
    color: var(--accent);
}

/* ========== Controls row ========== */

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.retro-button {
    background: #2a2a2a;
    color: #ffffff;
    border: 2px solid #4a4a4a;
    border-radius: 4px;
    padding: 6px 12px;
    font-family: monospace;
    font-size: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 2px 2px 0 #000;
    flex: 1;
    cursor: pointer;
}

.retro-button:hover {
    background: #4a4a4a;
    border-color: #d2d2d2;
    transform: translate(-1px, -1px);
    box-shadow: 3px 3px 0 #000;
}

.retro-button:active {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0 #000;
}

.retro-button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.retro-button .fa-pause,
.retro-button.playing .fa-play,
.retro-button .pause-text,
.retro-button.playing .play-text {
    display: none;
}

.retro-button.playing .fa-pause,
.retro-button.playing .pause-text {
    display: inline-block;
}

.retro-button .fa-play,
.retro-button .play-text {
    display: inline-block;
}

.retro-button[disabled],
.retro-button[aria-disabled="true"] {
    opacity: 0.4;
    cursor: not-allowed;
    box-shadow: 2px 2px 0 #000;
}

.retro-button[disabled]:hover,
.retro-button[aria-disabled="true"]:hover {
    background: #2a2a2a;
    border-color: #4a4a4a;
    transform: none;
    box-shadow: 2px 2px 0 #000;
}

/* Dim chip wrappers whose <select> child is disabled. */
.subsong-control:has(.retro-select:disabled),
.viz-control:has(.retro-select:disabled) {
    opacity: 0.4;
    cursor: not-allowed;
}

.volume-control {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #2a2a2a;
    border: 2px solid #4a4a4a;
    border-radius: 4px;
    padding: 6px 12px;
    box-shadow: 2px 2px 0 #000;
    font-size: 12px;
    flex: 0 1 200px;
    min-width: 120px;
}

.volume-control input[type="range"] {
    flex: 1;
    min-width: 0;
    accent-color: var(--accent);
    cursor: pointer;
}

.retro-button-icon {
    flex: 0 0 auto;
    padding: 6px 10px;
}

.subsong-control {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #2a2a2a;
    border: 2px solid #4a4a4a;
    border-radius: 4px;
    padding: 6px 10px;
    box-shadow: 2px 2px 0 #000;
    font-size: 12px;
    flex: 0 1 220px;
    min-width: 120px;
}
.subsong-control[hidden] { display: none; }

.viz-control {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #2a2a2a;
    border: 2px solid #4a4a4a;
    border-radius: 4px;
    padding: 6px 10px;
    box-shadow: 2px 2px 0 #000;
    font-size: 12px;
    flex: 0 1 220px;
    min-width: 120px;
}
.viz-control[hidden] { display: none; }

.retro-select {
    background: #1a1a1a;
    color: #ffffff;
    border: 1px solid #4a4a4a;
    border-radius: 3px;
    padding: 2px 4px;
    font-family: monospace;
    font-size: 12px;
    flex: 1;
    min-width: 0;
}
.retro-select:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* ========== Tracker grid ========== */

.tracker-container {
    display: grid;
    grid-template-columns: 1fr minmax(150px, 25%);
    gap: 16px;
}
/* Stamped on <html> by preboot; kept in sync by toggleSamplesVisible. */
html.samples-hidden .tracker-container { grid-template-columns: 1fr; }
html.samples-hidden .sample-section    { display: none; }

/* Single scroll container — both axes. Sticky header rides the horizontal scroll. */
.tracker-main {
    min-width: 0;
    overflow: auto;
    contain: layout paint style;
    /* Don't add scrollbar-width/color — overrides the ::-webkit-scrollbar rules below. */
}

/* Vertical collapsed (auto-scroll), horizontal kept for wide channel sets. */
.tracker-main::-webkit-scrollbar { width: 0; height: 8px; }
.tracker-main::-webkit-scrollbar-track { background: var(--tracker-bg); border-radius: 4px; }
.tracker-main::-webkit-scrollbar-thumb { background: var(--tracker-row-highlight); border-radius: 4px; }
.tracker-main::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--tracker-row-highlight) 70%, white);
}

.tracker-header {
    display: none;
    grid-template-columns: 20px repeat(8, minmax(80px, 1fr));
    gap: 2px;
    background: var(--tracker-bg-alt);
    padding: 4px;
    border-radius: 4px 4px 0 0;
    position: sticky;
    top: 0;
    z-index: 2;
    /* --grid-min-width is published by tracker.js (paints across full overflow). */
    min-width: var(--grid-min-width, 100%);
}

.tracker-grid {
    display: none;
    gap: 0 2px;
    background: var(--tracker-bg-alt);
    padding: 4px;
    border-radius: 0 0 4px 4px;
    min-width: var(--grid-min-width, 100%);
    /* Paint/layout island — hidden prefetched grid isolated from the visible one. */
    contain: content;
}

/* Spacers above row 0 and below last row — heights set by tracker.js. */
.grid-spacer {
    grid-column: 1 / -1;
    background: var(--tracker-bg);
}

.channel-cell {
    background: var(--tracker-bg);
    color: var(--tracker-fg);
    padding: 0 4px;
    font-family: monospace;
    font-size: 12px;
    border: none;
    white-space: nowrap;
}

.channel-cell:not(.channel-header) {
    container-type: inline-size;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1ch;
    min-width: 0;
    overflow: hidden;
}

/* Segment visibility tiers — floor is pitch+sample+volume; effect drops first. */
@container (max-width: 15ch) { .channel-cell { gap: 0.5ch; } }
@container (max-width: 13ch) { .channel-cell { gap: 0;     } }
@container (max-width: 12ch) { .channel-cell .effect { display: none; } }

.row-label {
    background: var(--tracker-bg);
    color: var(--tracker-fg);
    padding: 0 4px;
    text-align: right;
    font-family: monospace;
    font-size: 12px;
    min-width: 20px;
}

.header-label {
    background: var(--tracker-bg);
    padding: 4px;
    min-width: 20px;
    cursor: pointer;
    border: none;
    color: var(--tracker-fg);
}

.header-label.muteable {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s ease;
}
.header-label.muteable:hover { background: var(--tracker-row-highlight); }
.header-label.muteable:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: -2px;
}

.header-label-icon {
    font-size: 0.9rem;
    line-height: 1;
    color: var(--header-icon-color, currentColor);
    opacity: var(--header-icon-opacity, 0.65);
    transition: opacity 0.15s ease;
}
.header-label.muteable:hover .header-label-icon,
.header-label.muteable:focus-visible .header-label-icon { opacity: 1; }

.channel-header {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color 0.2s ease;
    color: inherit;
}

.channel-header:hover { background: var(--tracker-row-highlight); }
.channel-header:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

.channel-label {
    font-size: 0.85rem;
    margin-bottom: 4px;
    width: 100%;
}

.canvas-parent {
    width: 100%;
    height: 40px;
    background: var(--viz-canvas-bg);
    border-radius: 4px;
    position: relative;
    /* Scopes paint/layout per canvas — with 32-64 of these repainting at
       30 Hz, this lets the browser skip up-tree invalidation when any one
       canvas paints. Each canvas-parent has fixed height and a single
       full-bleed child, so containment is safe. */
    contain: layout style paint;
}

.visualization-canvas {
    width: 100%;
    height: 100%;
    border: 1px solid #4a4a4a;
    border-radius: 2px;
    background: #2a2a2a;
}

/* ========== Sample list ========== */

.sample-section { min-width: 0; }

.sample-list {
    background: var(--tracker-bg);
    padding: 8px;
    display: none;
    border-radius: 4px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--tracker-row-highlight) var(--tracker-bg);
}

.sample-list::-webkit-scrollbar { width: 8px; }
.sample-list::-webkit-scrollbar-track { background: var(--tracker-bg); border-radius: 4px; }
.sample-list::-webkit-scrollbar-thumb { background: var(--tracker-row-highlight); border-radius: 4px; }
.sample-list::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--tracker-row-highlight) 70%, white);
}

.sample-item {
    padding: 4px;
    font-size: 12px;
    height: 24px;
    color: var(--tracker-fg);
    font-family: monospace;
}

.sample-item.highlighted { background: var(--tracker-row-highlight); }

/* ========== States ========== */

.muted {
    opacity: 0.5;
    filter: grayscale(80%);
}

.highlighted-row {
    background: var(--tracker-row-highlight) !important;
}

.note, .sample, .volume, .effect {
    transition: opacity 0.2s ease, filter 0.2s ease;
}

.note    { color: var(--tracker-note);   }
.sample  { color: var(--tracker-sample); }
.volume  { color: var(--tracker-volume); }
.effect  { color: var(--tracker-effect); }

/* ========== Toast ========== */

#toast {
    position: fixed;
    bottom: 16px;
    left: 50%;
    transform: translate(-50%, 100%);
    background: #1f2937;
    color: #ffffff;
    border: 2px solid #4a4a4a;
    border-radius: 4px;
    padding: 10px 16px;
    box-shadow: 3px 3px 0 #000;
    font-family: monospace;
    font-size: 13px;
    max-width: min(90vw, 480px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
    z-index: 2000;
}

#toast.visible {
    transform: translate(-50%, 0);
    opacity: 1;
}

#toast[data-variant="error"] { border-color: #ef4444; }
#toast[data-variant="warn"]  { border-color: #facc15; }
#toast[data-variant="info"]  { border-color: var(--accent); }

/* ========== Drop zone ========== */

#dropZone {
    position: fixed;
    inset: 0;
    background: rgba(19, 4, 27, 0.78);
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
    z-index: 1500;
}

body.drag-over #dropZone { opacity: 1; }

.drop-zone-card {
    background: #1f2937;
    border: 3px dashed var(--accent);
    border-radius: 12px;
    padding: 32px 56px;
    text-align: center;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
    font-family: monospace;
    color: #ffffff;
}

.drop-zone-card i {
    font-size: 48px;
    color: var(--accent);
    margin-bottom: 12px;
}

.drop-zone-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 6px;
}

.drop-zone-hint {
    font-size: 13px;
    color: #9ca3af;
}

/* ========== Help / keyboard shortcuts overlay ========== */

#helpOverlay {
    /* Popup palette is intentionally theme-independent (dark backdrop, hardcoded
       chrome). `--help-accent` is the lone "lively" colour used by the title and
       the footer links so it contrasts with the dark card in every theme. */
    --help-accent: #facc15;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.78);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2500;
}

#helpOverlay.visible { display: flex; }

.help-card {
    background: #1f2937;
    border: 2px solid #4a4a4a;
    border-radius: 8px;
    box-shadow: 6px 6px 0 #000;
    min-width: min(560px, 92vw);
    max-width: 92vw;
    max-height: 86vh;
    overflow: auto;
    padding: 20px 24px;
    color: #ffffff;
    font-family: monospace;
}

.help-card h2 {
    margin: 0 0 12px;
    font-size: 16px;
    color: var(--help-accent);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.help-card .help-close {
    background: transparent;
    border: 1px solid #4a4a4a;
    color: #ffffff;
    border-radius: 3px;
    width: 28px;
    height: 28px;
    font-size: 14px;
    cursor: pointer;
}
.help-card .help-close:hover { background: #4a4a4a; }

.help-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: max-content 1fr;
    column-gap: 16px;
    row-gap: 6px;
    font-size: 13px;
}

.help-list dt {
    color: #facc15;
    text-align: right;
    white-space: nowrap;
}

.help-list dd {
    margin: 0;
    color: #e5e7eb;
}

.help-credits {
    margin-top: 16px;
    padding-top: 10px;
    border-top: 1px solid #2a2a2a;
    font-size: 10px;
    line-height: 1.6;
    color: #6b7280;
    text-align: center;
}
.help-credits a {
    color: #9ca3af;
    text-decoration: none;
    border-bottom: 1px dotted #4a4a4a;
}
.help-credits a:hover,
.help-credits a:focus-visible {
    color: var(--help-accent);
    border-bottom-color: currentColor;
}
.help-credits-license { color: #4a4a4a; }

.help-credits .help-home {
    margin-bottom: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 22px;
    flex-wrap: wrap;
}
.help-credits .help-home a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: bold;
    letter-spacing: 0.02em;
    color: var(--help-accent);
    border-bottom: none;
    transition: transform 0.15s ease, filter 0.15s ease;
}
.help-credits .help-home a:hover,
.help-credits .help-home a:focus-visible {
    transform: translateY(-1px);
    filter: brightness(1.15);
    outline: none;
}
.help-credits .help-home img {
    display: inline-block;
    width: 22px;
    height: 22px;
}
.help-credits .help-home .help-support .help-support-icon {
    font-size: 18px;
    width: 22px;
    line-height: 1;
    text-align: center;
}

kbd {
    display: inline-block;
    background: #2a2a2a;
    border: 1px solid #4a4a4a;
    border-bottom-width: 2px;
    border-radius: 3px;
    padding: 1px 6px;
    font: inherit;
    font-size: 12px;
    color: #ffffff;
    min-width: 18px;
    text-align: center;
}

/* ========== Responsive ========== */

@media (max-width: 768px) {
    .tracker-container { grid-template-columns: 1fr; }

    .channel-cell { min-width: 60px; font-size: 10px; }
    .row-label, .header-label { min-width: 30px; font-size: 10px; }

    .sample-list { margin-top: 16px; height: auto !important; max-height: 200px; }

    .retro-button { padding: 4px 8px; font-size: 10px; flex: 1 1 calc(50% - 4px); }

    .mod-info-box {
        min-width: 0;
        flex: 1 1 calc(50% - 4px);
        padding: 6px;
        font-size: 10px;
    }

    .canvas-parent { height: 28px; }
}

/* Mobile — trim to essentials; patterns own the viewport. */
@media (max-width: 640px) {
    /* Wider row-label column so 2-char hex doesn't clip on bold themes. */
    :root { --row-label-col: 28px; }

    /* Show only Title (2nd child). */
    .mod-info-box:not(:nth-child(2)) { display: none; }

    #subsongControl,
    #toggle-visualizations,
    #toggle-samples,
    #show-help,
    .volume-control {
        display: none;
    }

    .controls .retro-button .btn-label { display: none; }
    .controls .retro-button {
        flex: 1 1 calc(20% - 8px) !important;
        min-width: 0 !important;
        padding: 6px 8px !important;
        gap: 0;
    }

    /* Viz + theme pickers share row 2 (~50% basis each). */
    .controls .viz-control,
    .controls .theme-control {
        flex: 1 1 calc(50% - 8px) !important;
        min-width: 0 !important;
    }

    .sample-section { display: none; }

    /* Force single-column tracker — beats per-theme grid re-templates. */
    .tracker-container { grid-template-columns: 1fr !important; }

    /* Collapse .app to single-column flex — beats per-theme grid layouts. */
    .app {
        display: flex !important;
        flex-direction: column !important;
        padding: 8px !important;
        margin: 0 !important;
        max-width: none !important;
    }

    .controls { flex-direction: row !important; }
}

/* Tablet (641-1024 px) — force row 1 = 5 transport buttons. */
@media (min-width: 641px) and (max-width: 1024px) {
    .controls #load,
    .controls #play,
    .controls #stop,
    .controls #previous,
    .controls #next {
        flex: 1 1 calc(20% - 8px) !important;
        min-width: 0 !important;
    }
}

/* Hide help (?) below 1024 px — `?` keyboard shortcut still works. */
@media (min-width: 641px) and (max-width: 1024px) {
    #show-help { display: none; }
}


/* ========== Theme-picker chip ========== */

.theme-control {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #2a2a2a;
    border: 2px solid #4a4a4a;
    border-radius: 4px;
    padding: 6px 10px;
    box-shadow: 2px 2px 0 #000;
    font-size: 12px;
    flex: 0 1 200px;
    min-width: 120px;
}


/* Uniform control-bar heights — opted out by hifi-deck (round buttons). */
:root:not(.theme-hifi-deck) .controls {
    align-items: stretch;
}

:root:not(.theme-hifi-deck) .controls > .retro-button {
    align-items: center;
}