/* Year 9 Science home: the "Explain it" written task above each section's
 * actions row (science/templates/science/_explain_it.html).
 *
 * Complete without JavaScript: a prompt, a box to write in, and the model
 * answer inside a nested <details>. unit-explain.js marks the task `.sx-js`,
 * which swaps that for a Compare button and a score. Colours come from the
 * section's own strand tokens (--strand, --strand-soft, --strand-ink) so each
 * strand keeps its colour; the model answer sits on a gold tint, as the key idea does. */

.sx {
    margin: 0 0 1.4rem;
    border: 1px solid var(--line);
    border-left: 4px solid var(--strand, var(--teal));
    border-radius: 14px;
    background: var(--paper);
}

.sx-sum {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 8px 18px;
    cursor: pointer;
    font-size: 0.97rem;
    font-weight: 700;
    line-height: 1.4;
    color: var(--strand-ink, var(--teal-deep));
}
.sx[open] > .sx-sum { background: var(--strand-soft, var(--cream)); border-radius: 10px 10px 0 0; }

.sx-body { padding: 14px 18px 18px; }

.sx-prompt { margin: 0 0 12px; font-size: 1rem; line-height: 1.6; }
.sx-cmd {
    display: inline-block;
    margin-right: 6px;
    padding: 1px 10px;
    border-radius: 999px;
    background: var(--strand-soft, var(--cream));
    color: var(--strand-ink, var(--teal-deep));
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.sx-label { display: block; margin: 0 0 6px; font-size: 0.86rem; font-weight: 600; color: var(--muted); }
.sx-answer {
    display: block;
    width: 100%;
    min-height: 9rem;
    padding: 10px 12px;
    border: 2px solid var(--line);
    border-radius: 10px;
    background: var(--paper);
    color: var(--ink);
    font: inherit;
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
}
.sx-answer:focus-visible { outline: 3px solid var(--strand, var(--teal)); outline-offset: 2px; }
.sx-kept { margin: 6px 0 0; font-size: 0.8rem; color: var(--muted); }

.sx-tools { display: flex; flex-wrap: wrap; gap: 10px; margin: 12px 0 0; }
.sx-js-only { display: none; }
.sx-js .sx-js-only { display: inline-flex; }
.sx-btn {
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 8px 20px;
    border: 2px solid var(--strand, var(--teal));
    border-radius: 999px;
    background: var(--strand-soft, var(--cream));
    color: var(--strand-ink, var(--teal-deep));
    font: inherit;
    font-size: 0.93rem;
    font-weight: 700;
    line-height: 1.3;
    cursor: pointer;
}
.sx-btn:hover { background: var(--paper); }
.sx-btn:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }
.sx-btn-quiet { border-color: var(--line); background: var(--paper); color: var(--ink); font-weight: 600; }

/* the model answer */
.sx-live { margin: 14px 0 0; }
.sx-model {
    border: 1px solid var(--gold);
    border-radius: 12px;
    background: color-mix(in srgb, var(--gold) 14%, var(--paper));
}
.sx-model-sum {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 8px 16px;
    cursor: pointer;
    font-weight: 700;
    color: color-mix(in srgb, var(--gold) 45%, var(--ink));
}
.sx-js .sx-model-sum { display: none; }
.sx-model-body { padding: 4px 16px 14px; }
.sx-h {
    margin: 12px 0 6px;
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: color-mix(in srgb, var(--gold) 45%, var(--ink));
}
.sx-points { margin: 0; padding: 0; list-style: none; }
.sx-point {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    min-height: 44px;
    padding: 6px 0;
    cursor: pointer;
    font-size: 0.97rem;
    line-height: 1.5;
}
.sx-point input {
    flex: none;
    width: 22px;
    height: 22px;
    margin-top: 2px;
    accent-color: var(--strand, var(--teal));
}
.sx-point input:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }
.sx-score { margin: 8px 0 0; font-weight: 700; color: var(--strand-ink, var(--teal-deep)); }
.sx-model-text { margin: 0; font-size: 1rem; line-height: 1.65; color: var(--ink); }

@media (max-width: 699.98px) {
    .sx-body { padding: 12px 14px 16px; }
    .sx-btn { flex: 1 1 100%; }
}

/* On paper: the prompt, ruled space to write in, and the model answer. */
@media print {
    .sx { border: 0; border-left: 3px solid var(--ink); break-inside: avoid-page; }
    .sx-sum { padding-left: 10px; background: none; }
    .sx-label, .sx-points, .sx-score, .sx-h:first-of-type { display: none; }
    .sx-answer {
        min-height: 7rem;
        border: 0;
        background: repeating-linear-gradient(
            to bottom, transparent 0, transparent 1.55rem, var(--ink) 1.55rem, var(--ink) calc(1.55rem + 1px)
        );
        line-height: 1.6rem;
        resize: none;
    }
    .sx-model[hidden] { display: block; }
    .sx-model { background: none; border: 0; }
    .sx-model-sum { display: none; }
}