/* Figures for the context-fold post. Everything is scoped under .cf. */

.cf {
    --cf-a: #b07800;
    --cf-b: #16857a;
    --cf-c: #7250c0;
    --cf-d: #c0443f;
    --cf-sys: #6b7280;
    --cf-hot: #d62828;
    --cf-ok: #2b8a3e;
    --cf-dim: var(--text-color-alt, #666);
    --cf-bg: var(--background-color, #fafafa);
    --cf-bg2: var(--background-color-alt, #eee);
    --cf-fg: var(--text-color, #000);
    position: relative;
    margin: 2rem 0 !important;
    padding: 12px;
    border: 2px solid var(--cf-fg);
    font-family: var(--code-font-family, monospace);
    font-size: 11px;
    line-height: 1.35;
    color: var(--cf-fg);
    background: var(--cf-bg);
}

@media (prefers-color-scheme: dark) {
    .cf {
        --cf-a: #f0b429;
        --cf-b: #3cc7b4;
        --cf-c: #a78bfa;
        --cf-d: #f07167;
        --cf-sys: #9ca3af;
        --cf-hot: #ff6b6b;
        --cf-ok: #69db7c;
    }
}

/* the blog theme puts margin-top on every *+*; our layout does its own spacing */
.cf *,
.cf *+* {
    margin-top: 0;
    box-sizing: border-box;
}

.cf-caption {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1ch;
    margin-bottom: 10px;
    font-weight: 600;
}

.cf-btn {
    font: inherit;
    font-size: 11px;
    padding: 2px 10px;
    border: 1.5px solid var(--cf-fg);
    background: var(--cf-bg);
    color: var(--cf-fg);
    cursor: pointer;
    white-space: nowrap;
}

.cf-btn:hover {
    background: var(--cf-fg);
    color: var(--cf-bg);
}

.cf-foot {
    margin-top: 10px !important;
    color: var(--cf-dim);
    font-size: 10.5px;
}

/* ---------- rows: one message each ---------- */

.cf-row {
    --c: var(--cf-sys);
    position: relative;
    height: 15px;
    line-height: 15px;
    margin-bottom: 3px;
    padding: 0 6px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    border-left: 3px solid var(--c);
    background: color-mix(in srgb, var(--c) 14%, transparent);
    font-size: 10px;
    opacity: 1;
    transition: height .5s ease, margin .5s ease, opacity .4s ease,
        padding .5s ease, background .4s ease, transform .4s ease;
    animation: cf-in .35s ease;
}

.cf-row.u { font-weight: 700; }
.cf-row.t { padding-left: 16px; color: var(--cf-dim); }
.cf-row.a { font-weight: 600; background: color-mix(in srgb, var(--c) 28%, transparent); }
.cf-row.a::before { content: "◆ "; color: var(--c); }
.cf-row.u::before { content: "you ▸ "; color: var(--c); }

.cf-row.ta { --c: var(--cf-a); }
.cf-row.tb { --c: var(--cf-b); }
.cf-row.tc { --c: var(--cf-c); }
.cf-row.td { --c: var(--cf-d); }

.cf-row.gone {
    height: 0;
    margin-bottom: 0;
    opacity: 0;
}

.cf-row.lit {
    background: color-mix(in srgb, var(--c) 40%, transparent);
}

@keyframes cf-in {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: none; }
}

/* a fold result: small, still says what happened */
.cf-chip {
    --c: var(--cf-sys);
    height: 32px;
    margin-bottom: 3px;
    padding: 2px 6px;
    border: 1.5px dashed var(--c);
    border-left-width: 3px;
    border-left-style: solid;
    font-size: 9.5px;
    line-height: 13px;
    overflow: hidden;
    white-space: nowrap;
    animation: cf-chip .5s ease;
}
.cf-chip b { color: var(--c); }
.cf-chip .cf-arch { color: var(--cf-dim); float: right; }
.cf-chip .cf-l2 { display: block; text-overflow: ellipsis; overflow: hidden; }

@keyframes cf-chip {
    from { height: 0; opacity: 0; }
    to { height: 32px; opacity: 1; }
}

/* a compaction summary: opaque, hatched, originals gone */
.cf-summary {
    height: 34px;
    margin-bottom: 3px;
    padding: 3px 6px;
    font-size: 9.5px;
    line-height: 14px;
    color: var(--cf-fg);
    border-left: 3px solid var(--cf-sys);
    background: repeating-linear-gradient(-45deg,
            color-mix(in srgb, var(--cf-sys) 25%, transparent) 0 4px,
            color-mix(in srgb, var(--cf-sys) 8%, transparent) 4px 8px);
    animation: cf-chip .5s ease;
    overflow: hidden;
    white-space: nowrap;
}
.cf-summary s { color: var(--cf-hot); }

/* ---------- figure 1: compress vs fold ---------- */

.cf-duo {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 14px;
}

@media (max-width: 560px) {
    .cf-duo { grid-template-columns: 1fr; }
}

.cf-pane-h {
    font-weight: 700;
    margin-bottom: 2px;
}

.cf-status {
    height: 28px;
    color: var(--cf-dim);
    font-size: 10px;
    line-height: 14px;
    overflow: hidden;
    transition: color .3s;
}
.cf-status.hot { color: var(--cf-hot); }
.cf-status.ok { color: var(--cf-ok); }

.cf-win {
    position: relative;
    height: 330px;
    padding: 6px 6px 6px 14px;
    background: var(--cf-bg2);
    overflow: hidden;
}

.cf-list { position: relative; }

.cf-line {
    position: absolute;
    left: 0;
    right: 0;
    top: 272px;
    border-top: 1.5px dashed var(--cf-hot);
    pointer-events: none;
    z-index: 2;
}
.cf-line span {
    position: absolute;
    right: 4px;
    top: -14px;
    font-size: 9px;
    color: var(--cf-hot);
    background: var(--cf-bg2);
    padding: 0 3px;
}

.cf-win.flash { animation: cf-flash .6s ease 2; }
@keyframes cf-flash {
    50% { background: color-mix(in srgb, var(--cf-hot) 22%, var(--cf-bg2)); }
}

/* the bracket drawn upward: looking back */
.cf-bracket {
    position: absolute;
    left: -10px;
    width: 6px;
    border: 2px solid var(--cf-fg);
    border-right: 0;
    transition: top .7s ease, height .7s ease, opacity .3s;
    z-index: 3;
}

.cf-meter {
    margin-top: 6px !important;
    font-size: 10px;
    color: var(--cf-dim);
}
.cf-meter .bar {
    height: 6px;
    margin-top: 3px !important;
    background: var(--cf-bg2);
    overflow: hidden;
}
.cf-meter .bar i {
    display: block;
    height: 100%;
    width: 0;
    background: var(--cf-fg);
    transition: width .35s ease;
}
.cf-meter .bar i.hot { background: var(--cf-hot); }

/* ---------- figure 2: the card, in a terminal ---------- */

.cf-term {
    min-height: 420px;
    padding: 10px 12px;
    background: #111;
    color: #ddd;
    font-size: 11px;
    line-height: 1.45;
    white-space: pre-wrap;
    word-break: break-word;
    border-radius: 3px;
}
.cf-term .k { color: #8a8a8a; }
.cf-term .y { color: #f0b429; }
.cf-term .g { color: #69db7c; }
.cf-term .c { color: #66d9ef; }
.cf-term .m { color: #c792ea; }
.cf-term .cur {
    display: inline-block;
    width: .6em;
    height: 1.1em;
    vertical-align: text-bottom;
    background: #ddd;
    animation: cf-blink 1s steps(1) infinite;
}
@keyframes cf-blink { 50% { opacity: 0; } }

/* ---------- figure 3: the stack ---------- */

.cf-trio {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr) minmax(0, 1fr);
    gap: 10px;
}

@media (max-width: 560px) {
    .cf-trio { grid-template-columns: 1fr; }
}

.cf-col {
    position: relative;
    min-height: 330px;
    padding: 6px;
    background: var(--cf-bg2);
    transition: opacity .4s, outline-color .4s;
    outline: 2px solid transparent;
    outline-offset: -2px;
}
.cf-col.idle { opacity: .35; }
.cf-col.live { outline-color: var(--cf-fg); }

.cf-col-h {
    font-weight: 700;
    font-size: 10.5px;
    margin-bottom: 2px;
}
.cf-col-s {
    height: 26px;
    font-size: 9.5px;
    line-height: 13px;
    color: var(--cf-dim);
}

.cf-prefix {
    height: 34px;
    margin-bottom: 3px;
    padding: 3px 6px;
    font-size: 9.5px;
    line-height: 14px;
    border-left: 3px solid var(--cf-sys);
    background: color-mix(in srgb, var(--cf-sys) 18%, transparent);
    transition: box-shadow .4s, background .4s;
}
.cf-prefix.hit {
    box-shadow: 0 0 0 2px var(--cf-ok) inset;
    background: color-mix(in srgb, var(--cf-ok) 16%, transparent);
}

.cf-ghost {
    height: 30px;
    margin-bottom: 3px;
    padding: 2px 6px;
    font-size: 9.5px;
    line-height: 13px;
    border: 1.5px dashed var(--cf-ok);
    color: var(--cf-ok);
    animation: cf-chip .5s ease;
    overflow: hidden;
}

.cf-snap {
    --c: var(--cf-c);
    height: 30px;
    margin-bottom: 3px;
    padding: 2px 6px;
    font-size: 9.5px;
    line-height: 13px;
    border-left: 3px solid var(--c);
    background: color-mix(in srgb, var(--c) 22%, transparent);
    animation: cf-chip .5s ease;
    overflow: hidden;
}
.cf-snap.fresh { --c: var(--cf-b); }

.cf-report {
    position: absolute;
    left: 6px;
    right: 6px;
    bottom: 6px;
    min-height: 44px;
    padding: 4px 6px;
    font-size: 9.5px;
    line-height: 13px;
    border: 2px solid var(--cf-c);
    background: var(--cf-bg);
    opacity: 0;
    transition: opacity .3s;
}
.cf-report.on { opacity: 1; }
.cf-report b { color: var(--cf-c); }
.cf-report.bump { animation: cf-bump .4s ease; }
@keyframes cf-bump { 40% { transform: scale(1.04); } }

.cf-fly {
    position: fixed;
    z-index: 50;
    margin: 0 !important;
    pointer-events: none;
    transition: transform .8s cubic-bezier(.5, 0, .2, 1), opacity .8s;
}

/* ---------- figure 4: s-expression ---------- */

.cf-sexp {
    padding: 10px 12px;
    background: var(--cf-bg2);
    font-size: 12px;
    line-height: 1.9;
    white-space: pre;
    overflow-x: auto;
}
.cf-sexp .hd { font-weight: 700; }
.cf-sexp .goal { color: var(--cf-dim); }
.cf-sexp .body {
    display: inline-block;
    max-width: 40ch;
    overflow: hidden;
    vertical-align: bottom;
    color: var(--cf-dim);
    transition: max-width .8s ease, opacity .6s;
}
.cf-sexp .ev .body { max-width: 0; opacity: 0; }
.cf-sexp .val {
    display: inline-block;
    max-width: 0;
    overflow: hidden;
    vertical-align: bottom;
    font-weight: 700;
    transition: max-width .8s ease .4s;
}
.cf-sexp .ev .val { max-width: 44ch; }
.cf-sexp .cl { display: inline-block; transition: color .3s; }
.cf-sexp .closing .cl { color: var(--cf-hot); animation: cf-bump .5s ease; font-weight: 700; }
.cf-sexp .f1 .hd, .cf-sexp .f1 .val { color: var(--cf-a); }
.cf-sexp .f2 .hd, .cf-sexp .f2 .val { color: var(--cf-c); }
.cf-sexp .f3 .hd, .cf-sexp .f3 .val { color: var(--cf-b); }
.cf-sexp .f4 .hd { color: var(--cf-d); }
.cf-sexp .cur {
    display: inline-block;
    width: .55em;
    height: 1.05em;
    vertical-align: text-bottom;
    background: var(--cf-fg);
    animation: cf-blink 1s steps(1) infinite;
}

@media (prefers-reduced-motion: reduce) {
    .cf-row, .cf-chip, .cf-summary, .cf-ghost, .cf-snap { animation: none; }
}

/* first paint: jump straight to the final frame */
.cf-instant *,
.cf-instant *::before {
    transition: none !important;
    animation: none !important;
}