/* Year 9 Science: the two small simulations (block type "sim"): particles and
 * heating (1.1) and collisions and rate (1.8). Loaded after science-ix.css and
 * built from its parts (.ix, .ix-card, .ix-head, .ix-chip, .ix-seg, .ix-btn).
 * Behaviour is science/static/science/ix-sim.js, ix-particles.js and
 * ix-collide.js; the rules they follow are in
 * .claude/rules/science-interactive-notes.md.
 *
 * Tokens only. A canvas cannot read var(--x), so each colour it paints is a
 * hidden swatch below; the script reads the swatch's computed colour. */

.ix-swatches { position: absolute; width: 0; height: 0; overflow: hidden; }
.ix-sw-box { color: var(--cream); }
.ix-sw-pfill { color: var(--ix-cyan-deep); }
.ix-sw-pedge { color: var(--ix-cyan-ink); }
.ix-sw-a { color: var(--ix-cyan-deep); }
.ix-sw-aedge { color: var(--ix-cyan-ink); }
.ix-sw-b { color: var(--ix-p); }
.ix-sw-p { color: var(--gold); }
.ix-sw-pedge2 { color: var(--ix-a); }
.ix-sw-flash { color: var(--gold); }
.ix-sw-text { color: var(--ink); }
.ix-sw-muted { color: var(--muted); }
.ix-sw-axis { color: var(--ix-slate-line); }
.ix-sw-cur { color: var(--teal-deep); }
.ix-sw-prev { color: color-mix(in srgb, var(--ink) 42%, var(--paper)); }

.ix-simcanvas {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 5 / 4;
    border: 2px solid var(--line);
    border-radius: 16px;
    background: var(--cream);
}

.ix-simbody {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding: 20px 22px 8px;
}
.ix-simp .ix-simbody { align-items: center; }
.ix-simview, .ix-simcol { min-width: 0; }
.ix-simside { display: grid; gap: 14px; align-content: center; min-width: 0; }

/* the state: named in the notes' words, always on screen */
.ix-simstate[hidden] { display: none; }
.ix-simstate { min-height: 3.1em; font-size: 1.05rem; line-height: 1.45; color: var(--muted); }
.ix-simstate b { margin-right: 0; font-size: 1.5rem; font-weight: 800; color: var(--ink); }
.ix-simstate span { font-weight: 600; }
.ix-simcount { font-size: 0.95rem; color: var(--muted); }
.ix-simcount b { font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }

.ix-simctl { display: grid; gap: 12px; justify-items: start; }
.ix-simctl[hidden] { display: none; }
.ix-slider { display: grid; gap: 4px; width: 100%; font-size: 0.9rem; font-weight: 700; }
.ix-slider input[type="range"] {
    width: 100%;
    height: 44px;
    margin: 0;
    accent-color: var(--teal-deep);
    cursor: pointer;
}
.ix-slider-ends { display: flex; justify-content: space-between; color: var(--muted); }
.ix-slider-ends small { font-size: 0.8rem; font-weight: 600; }
.ix-simhint { color: var(--muted); font-size: 0.88rem; }

/* the point to take away: not transient, not hidden behind a control */
.ix-simpoint {
    margin: 12px 22px 0;
    padding: 12px 16px;
    border-left: 5px solid var(--ix-cyan-deep);
    border-radius: 0 12px 12px 0;
    background: var(--ix-cyan-soft);
    font-size: 1.02rem;
    font-weight: 700;
    line-height: 1.45;
}
.ix-simnote { margin: 0; padding: 12px 22px 16px; color: var(--muted); font-size: 0.82rem; }
.ix:not(.is-live) .ix-simpoint { margin-bottom: 16px; }

/* reduced motion: three still pictures instead of the moving box */
.ix-panels { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.ix-panels[hidden] { display: none; }
.ix-panel { margin: 0; }
.ix-panel figcaption { margin-top: 8px; font-size: 0.92rem; color: var(--muted); line-height: 1.4; }
.ix-panel figcaption b { color: var(--ink); font-size: 1rem; }

/* collisions and rate */
.ix-simkey { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 10px; font-size: 0.85rem; color: var(--muted); }
.ix-simkey span { display: inline-flex; align-items: center; gap: 7px; }
.ix-simkey i { display: inline-block; flex: none; }
.ix-key-a { width: 16px; height: 16px; border-radius: 50%; background: var(--ix-cyan-deep); }
.ix-key-b { width: 9px; height: 9px; margin: 0 3px; border-radius: 50%; background: var(--ix-p); }
.ix-key-p { width: 9px; height: 9px; margin: 0 3px; background: var(--gold); border: 1.5px solid var(--ix-a); transform: rotate(45deg); }
.ix-simlegend { display: grid; gap: 4px; min-height: 3.2em; margin-top: 10px; font-size: 0.85rem; line-height: 1.4; color: var(--muted); }
.ix-lgi { display: block; }
.ix-lgi b { color: var(--ink); }
.ix-lgl { display: inline-block; width: 26px; height: 0; margin-right: 8px; vertical-align: middle; border-top: 4px solid var(--teal-deep); }
.ix-lgl.is-prev { border-top: 4px dashed color-mix(in srgb, var(--ink) 42%, var(--paper)); }

.ix-simread {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 28px;
    margin: 0;
    padding: 10px 22px 4px;
}
.ix-simread div { display: flex; align-items: baseline; gap: 8px; }
.ix-simread dt { color: var(--muted); font-size: 0.85rem; font-weight: 600; }
.ix-simread dd { margin: 0; min-width: 2ch; font-size: 1.5rem; font-weight: 800; font-variant-numeric: tabular-nums; }

.ix-simpick { display: grid; gap: 12px; justify-items: start; padding: 12px 22px 0; }
.ix-simrun { display: flex; flex-wrap: wrap; gap: 8px; }
.ix-simwhy { margin: 12px 22px 0; padding: 12px 16px; border-left: 5px solid var(--gold); border-radius: 0 12px 12px 0; background: var(--ix-gold-soft); font-size: 1rem; line-height: 1.5; }
.ix-simwhy:empty { display: none; }
.ix-simresult { min-height: 3em; margin: 0; padding: 12px 22px 0; font-size: 1rem; font-weight: 700; line-height: 1.5; color: var(--ink); }

@container (min-width: 640px) {
    .ix-simp .ix-simbody { grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr); gap: 28px; }
    .ix-simc .ix-simbody { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
}
@container (max-width: 520px) {
    .ix-simbody { padding: 16px 16px 4px; }
    .ix-panels { grid-template-columns: minmax(0, 1fr); }
    .ix-simpoint { margin: 12px 16px 0; }
    .ix-simnote { padding: 12px 16px 14px; }
    .ix-simread, .ix-simpick { padding-left: 16px; padding-right: 16px; }
    .ix-simwhy { margin-left: 16px; margin-right: 16px; }
    .ix-simresult { padding-left: 16px; padding-right: 16px; }
    .ix-simctl .ix-btn, .ix-simrun .ix-btn { flex: 1 1 0; }
    .ix-simrun { width: 100%; }
    .ix-seg { max-width: 100%; }
    .ix-seg button { padding: 0 10px; }
}