/* Figures for the merge-the-folds post. Everything is scoped under .fc.
   Same bench as the one-buffer figures: a model you drive, not a picture.
   Colour means one thing each: amber is a block in the view, red is the
   pair that just merged, grey is a block that exists but is not shown. */

.fc {
    --fc-fg: var(--text-color, #111);
    --fc-dim: var(--text-color-alt, #666);
    --fc-bg: var(--background-color, #fafafa);
    --fc-bg2: var(--background-color-alt, #eee);
    --fc-a: #b07800;                 /* a block in the view */
    --fc-a-fill: rgba(176, 120, 0, 0.18);
    --fc-pair: #c0443f;              /* the pair that just merged */
    --fc-ghost: #8a94a6;             /* exists, not in the view */
    --fc-ok: #2b8a3e;
    --fc-cached: rgba(138, 148, 166, 0.28);
    --fc-hot: rgba(192, 68, 63, 0.3);

    margin: 2.2rem 0 !important;
    padding: 14px 16px 12px;
    border-left: 4px solid var(--fc-a);
    background: var(--fc-bg2);
    font-family: var(--code-font-family, monospace);
    font-size: 12px;
    line-height: 1.4;
    color: var(--fc-fg);
}

@media (prefers-color-scheme: dark) {
    .fc {
        --fc-a: #f0b429;
        --fc-a-fill: rgba(240, 180, 41, 0.2);
        --fc-pair: #ff7b72;
        --fc-ghost: #8d99ad;
        --fc-ok: #69db7c;
        --fc-cached: rgba(141, 153, 173, 0.28);
        --fc-hot: rgba(255, 123, 114, 0.32);
    }
}

/* the theme puts margin-top on every *+* */
.fc *,
.fc *+* {
    margin-top: 0;
    box-sizing: border-box;
}

.fc figcaption {
    margin-top: 12px;
    font-family: var(--font-family, monospace);
    font-size: 13px;
    color: var(--fc-dim);
}

.fc code {
    font-size: inherit;
}

.fc-h {
    font-size: 11px;
    color: var(--fc-dim);
    margin: 8px 0 4px;
}

.fc pre {
    margin: 0;
    padding: 6px 8px;
    background: var(--fc-bg);
    border: 1px solid var(--fc-cached);
    font-size: 11.5px;
    line-height: 1.45;
    white-space: pre;
    overflow-x: auto;
}

/* ── svg ───────────────────────────────────────────────────── */

.fc svg {
    display: block;
    width: 100%;
    height: auto;
    overflow: visible;
}

.fc svg text {
    font-family: var(--code-font-family, monospace);
    font-size: 11px;
    fill: var(--fc-fg);
}

.fc svg text.fc-lbl {
    fill: var(--fc-dim);
}

.fc svg .fc-bit {
    fill: var(--fc-a);
    font-weight: 600;
}

.fc-blk {
    fill: none;
    stroke-width: 1.2;
}

.fc-blk.ghost {
    stroke: var(--fc-ghost);
    stroke-dasharray: 3 3;
    opacity: 0.6;
}

.fc-blk.view {
    stroke: var(--fc-a);
    fill: var(--fc-a-fill);
}

.fc-blk.pair {
    stroke: var(--fc-pair);
    stroke-width: 2.2;
    stroke-dasharray: none;
    opacity: 1;
}

.fc-saw .fc-B { stroke: var(--fc-pair); stroke-dasharray: 4 3; }
.fc-saw .fc-L { stroke: var(--fc-ok); stroke-dasharray: 4 3; }
.fc-saw .fc-axis { stroke: var(--fc-ghost); }
.fc-saw .fc-line { fill: none; stroke: var(--fc-fg); stroke-width: 1.6; }
.fc-saw .fc-dot { fill: var(--fc-a); }

/* ── strips (what a change costs) ──────────────────────────── */

.fc-strips {
    display: grid;
    gap: 6px;
}

.fc-strip {
    display: flex;
    gap: 2px;
    align-items: center;
}

.fc-strip-lbl {
    width: 13ch;
    flex: none;
    color: var(--fc-dim);
    font-size: 11px;
}

.fc-cell {
    flex: 1 1 0;
    text-align: center;
    padding: 3px 0;
    font-size: 10.5px;
    border: 1px solid transparent;
}

.fc-cell.cached {
    background: var(--fc-cached);
}

.fc-cell.hot {
    background: var(--fc-hot);
    border-color: var(--fc-pair);
}

.fc-key {
    margin-top: 8px;
    font-size: 11px;
    color: var(--fc-dim);
}

.fc-key .fc-cell {
    display: inline-block;
    width: 2.2ch;
    padding: 1px 0;
}

/* ── the three views ───────────────────────────────────────── */

.fc-views {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 10px;
}

.fc-view pre {
    font-size: 10.5px;
}

@media (max-width: 640px) {
    .fc-views {
        grid-template-columns: 1fr;
    }
}

/* ── controls (simulator) ──────────────────────────────────── */

.fc-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 12px;
    margin-bottom: 10px;
}

.fc button {
    font: inherit;
    font-weight: 600;
    text-transform: none;
    height: auto;
    line-height: 1.4;
    padding: 3px 10px;
    border: 1.5px solid var(--fc-fg);
    border-radius: 3px;
    background: var(--fc-bg);
    color: var(--fc-fg);
    cursor: pointer;
}

.fc button:hover {
    background: var(--fc-fg);
    color: var(--fc-bg);
}

.fc button.fc-quiet {
    font-weight: 400;
    border-color: var(--fc-ghost);
    color: var(--fc-dim);
}

.fc label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11.5px;
    color: var(--fc-dim);
}

.fc label output {
    color: var(--fc-fg);
    font-weight: 600;
    min-width: 2ch;
    text-align: right;
}

.fc input[type="range"] {
    width: 110px;
    height: auto;
    margin: 0;
    padding: 0;
    border: none;
    background: transparent;
    accent-color: var(--fc-a);
    -webkit-appearance: auto;
    appearance: auto;
}

.fc select {
    font: inherit;
    font-size: 11.5px;
    padding: 2px 4px;
    background: var(--fc-bg);
    color: var(--fc-fg);
    border: 1px solid var(--fc-ghost);
    border-radius: 3px;
}

.fc-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 18px;
    margin-bottom: 8px;
    font-size: 11.5px;
}

.fc-stats .fc-lbl {
    color: var(--fc-dim);
    margin-right: 6px;
}

.fc-stats b.over {
    color: var(--fc-pair);
}

.fc-lines {
    max-height: 190px;
    overflow-y: auto;
}

.fc-log {
    max-height: 120px;
    overflow-y: auto;
    color: var(--fc-dim);
}