/* Popov Academy — content-factory/archimedes-winter-2025-v1: student labs (loaded only on these pages). */
/* Reuse the site's component colours in both themes; semantic grass/acorn colours stay local. */
.arch-lab{min-width:0;--arch-surface:var(--play-stage,#fff);--arch-ink:var(--ink,#16213a);--arch-label:var(--ink,#16213a);--arch-muted:var(--ink-2,#4e586d);--arch-field-line:var(--ink-3,#5f6b83);--arch-soft-line:var(--play-line,#f1dfb6);
 --arch-primary-bg:var(--ink,#16213a);--arch-primary-ink:var(--on-ink,#fff);--arch-link:var(--ink,#16213a);--arch-pressed-bg:var(--ink,#16213a);--arch-pressed-line:var(--ink,#16213a);--arch-cell-on:var(--accent-soft,#e9effc);--arch-cell-on-line:var(--accent,#2457d6);
 --arch-good:var(--ok,#1f7a4b);--arch-bad:var(--bad,#a33a2a);--arch-focus:var(--accent,#2457d6);
 --arch-grass-bg:#dcfce7;--arch-grass-ink:#14532d;--arch-grass-line:#15803d;--arch-dry-bg:#fef08a;--arch-dry-ink:#713f12;--arch-dry-line:#a16207;
 --arch-yellow-ink:#854d0e;--arch-red-ink:#b91c1c;--arch-black-ink:#111827;--arch-swatch-ring:transparent}
@media (prefers-color-scheme: dark){:root[data-design="v2"]:not([data-theme="light"]) .arch-lab{--arch-surface:var(--play-stage);--arch-ink:var(--ink);--arch-label:var(--ink);--arch-muted:var(--ink-2);--arch-field-line:var(--ink-3);--arch-soft-line:var(--play-line);
 --arch-primary-bg:var(--ink);--arch-primary-ink:var(--on-ink);--arch-link:var(--ink);--arch-pressed-bg:var(--ink);--arch-pressed-line:var(--ink);--arch-cell-on:var(--accent-soft);--arch-cell-on-line:var(--accent);
 --arch-good:var(--ok);--arch-bad:var(--bad);
 --arch-grass-bg:#15301f;--arch-grass-ink:#bbf7d0;--arch-grass-line:#4ade80;--arch-dry-bg:#3d320a;--arch-dry-ink:#fde68a;--arch-dry-line:#facc15;
 --arch-yellow-ink:#fcd34d;--arch-red-ink:#fca5a5;--arch-black-ink:var(--ink);--arch-swatch-ring:#b1bacb}}
:root[data-design="v2"][data-theme="dark"] .arch-lab{--arch-surface:var(--play-stage);--arch-ink:var(--ink);--arch-label:var(--ink);--arch-muted:var(--ink-2);--arch-field-line:var(--ink-3);--arch-soft-line:var(--play-line);
 --arch-primary-bg:var(--ink);--arch-primary-ink:var(--on-ink);--arch-link:var(--ink);--arch-pressed-bg:var(--ink);--arch-pressed-line:var(--ink);--arch-cell-on:var(--accent-soft);--arch-cell-on-line:var(--accent);
 --arch-good:var(--ok);--arch-bad:var(--bad);
 --arch-grass-bg:#15301f;--arch-grass-ink:#bbf7d0;--arch-grass-line:#4ade80;--arch-dry-bg:#3d320a;--arch-dry-ink:#fde68a;--arch-dry-line:#facc15;
 --arch-yellow-ink:#fcd34d;--arch-red-ink:#fca5a5;--arch-black-ink:var(--ink);--arch-swatch-ring:#b1bacb}
.arch-lab [data-arch-lab-body],.arch-lab .arch-expr-form{display:grid;gap:16px;min-width:0}
.arch-lab .arch-fallback{color:var(--arch-muted);font-size:15px}
.arch-lab label{font-weight:600;color:var(--arch-label)}
.arch-lab .arch-help{font-size:14px;color:var(--arch-muted);margin:0}
.arch-lab .arch-row{display:flex;gap:8px;align-items:stretch;min-width:0}
.arch-lab input[type=text],.arch-lab input[type=number],.arch-lab select{font:inherit;font-size:18px;min-height:44px;padding:8px 12px;border:1px solid var(--arch-field-line);border-radius:12px;background:var(--arch-surface);color:var(--arch-ink);min-width:0}
.arch-lab input[type=text]{flex:1 1 auto;width:100%}
.arch-lab button{font:inherit;font-size:16px;line-height:1.4;min-height:44px;min-width:44px;padding:10px 16px;border-radius:999px;cursor:pointer;max-width:100%;white-space:normal}
.arch-lab :is(input,select,button){scroll-margin-block:120px}
.arch-lab .arch-primary{background:var(--arch-primary-bg);color:var(--arch-primary-ink);border:1px solid var(--arch-primary-bg);flex-shrink:0}
.arch-lab .arch-secondary{background:var(--arch-surface);color:var(--arch-link);border:1px solid var(--arch-field-line)}
.arch-lab button:disabled,.arch-lab button[aria-disabled=true]{opacity:.45;cursor:default}
.arch-lab button:focus-visible,.arch-lab input:focus-visible,.arch-lab select:focus-visible{outline:3px solid var(--arch-focus);outline-offset:2px}
.arch-lab .arch-actions{display:flex;flex-wrap:wrap;gap:8px}
.arch-lab .arch-toggle{display:flex;flex-wrap:wrap;gap:6px}
.arch-lab .arch-toggle button{background:var(--arch-surface);color:var(--arch-link);border:1px solid var(--arch-field-line)}
.arch-lab .arch-toggle button[aria-pressed=true]{background:var(--arch-pressed-bg);border-color:var(--arch-pressed-line);color:var(--arch-primary-ink);font-weight:600}
.arch-lab .arch-result{background:var(--arch-surface);color:var(--arch-ink);border:1px solid var(--arch-soft-line);border-radius:14px;padding:14px 16px;line-height:1.55;min-width:0;overflow-wrap:anywhere}
.arch-lab .arch-result:empty{display:none}
.arch-lab .arch-result p{margin:6px 0}
.arch-lab .arch-checks{list-style:none;padding:0;margin:6px 0;display:grid;gap:12px}
.arch-lab .arch-checks li{display:flex;gap:8px;align-items:flex-start}
.arch-lab .arch-check-copy{display:grid;gap:3px;min-width:0}
.arch-lab .arch-check-detail{font-size:.92em;color:var(--arch-muted)}
.arch-lab .arch-mark{font-weight:700;flex-shrink:0;width:1.2em}
.arch-lab .arch-pass .arch-mark,.arch-lab .arch-good{color:var(--arch-good)}
.arch-lab .arch-fail .arch-mark,.arch-lab .arch-bad{color:var(--arch-bad)}
.arch-lab .arch-fail:not(:has(.arch-mark))::before{content:'✗';color:var(--arch-bad);font-weight:700;margin-right:6px}
.arch-lab .arch-pass:not(:has(.arch-mark))::before{content:'✓';color:var(--arch-good);font-weight:700;margin-right:6px}
.arch-lab .arch-table-wrap{overflow-x:auto;max-width:100%}
.arch-lab .arch-bottles{border-collapse:collapse;margin:0 auto}
.arch-lab .arch-bottles th{font-size:14px;font-weight:600;padding:4px 6px;color:var(--arch-label);text-align:center}
.arch-lab .arch-bottles td{padding:2px 4px;text-align:center}
.arch-lab .arch-cell{width:52px;height:44px;padding:0;border-radius:10px;background:var(--arch-surface);color:var(--arch-ink);border:1px solid var(--arch-field-line);font-size:20px}
.arch-lab .arch-cell[aria-pressed=true]{background:var(--arch-cell-on);border-color:var(--arch-cell-on-line)}
.arch-lab .arch-sim-box{display:grid;gap:12px;border-top:1px solid var(--arch-soft-line);padding-top:20px;margin-top:4px}
.arch-lab .arch-sim p{margin:12px 0 0}
.arch-lab .arch-grass{display:flex;flex-wrap:wrap;gap:6px}
.arch-lab .arch-patch{display:inline-block;padding:6px 10px;border-radius:6px;background:var(--arch-grass-bg);color:var(--arch-grass-ink);border:1px solid var(--arch-grass-line);font-size:15px}
.arch-lab .arch-patch.arch-yellow{background:var(--arch-dry-bg);color:var(--arch-dry-ink);border-color:var(--arch-dry-line)}
.arch-lab .arch-steppers{display:grid;grid-template-columns:repeat(auto-fit,minmax(184px,1fr));gap:10px}
.arch-lab .arch-stepper{display:grid;gap:6px}
.arch-lab .arch-stepper input{width:80px;flex:0 0 80px;padding-inline:6px;text-align:center;font-variant-numeric:tabular-nums}
.arch-lab .arch-step{background:var(--arch-surface);color:var(--arch-link);border:1px solid var(--arch-field-line);font-size:22px;padding:0}
.arch-lab .arch-yellow label{color:var(--arch-yellow-ink)}.arch-lab .arch-red label{color:var(--arch-red-ink)}.arch-lab .arch-black label{color:var(--arch-black-ink)}
/* A fixed-colour acorn swatch keeps the colour meaning in both themes (the label text alone cannot be black on a dark page). */
.arch-lab .arch-stepper label::before{content:'';display:inline-block;width:.8em;height:.8em;border-radius:50%;margin-right:.4em;vertical-align:-.05em;box-shadow:0 0 0 1.5px var(--arch-swatch-ring)}
.arch-lab .arch-yellow label::before{background:#eab308}.arch-lab .arch-red label::before{background:#dc2626}.arch-lab .arch-black label::before{background:#111827}
.arch-lab #arch-n{width:84px}
@media(max-width:480px){.arch-lab .arch-row{flex-wrap:wrap}.arch-lab .arch-row .arch-primary{flex:1 1 100%}.arch-lab .arch-stepper .arch-row{flex-wrap:nowrap}.arch-lab .arch-cell{width:48px}}
@media(max-width:400px){.arch-lab .arch-cell{width:44px}.arch-lab .arch-bottles td{padding:2px}.arch-lab .arch-bottles th{padding:4px 2px;font-size:12px}}

/* Keep the shared research renderer aligned with the current site on this set only.
   Diagrams retain their light paper; controls and readouts follow the selected theme. */
[data-problem-id^="archimedes-winter-"] .cf-figure figcaption,
[data-problem-id^="archimedes-winter-"] .lesson-source{color:var(--ink-2)}
[data-problem-id^="archimedes-winter-"] .lesson-source summary{color:var(--ink)}
[data-problem-id^="archimedes-winter-"] :is(button[data-cf-zoom],button[data-cf-scene-zoom]){color:var(--ink);background:var(--play-stage);border-color:var(--ink-3);border-radius:999px;min-height:44px;padding:10px 16px;margin-top:12px;max-width:100%;line-height:1.4}
[data-problem-id^="archimedes-winter-"] .interactive-actions button{color:var(--ink);background:var(--play-stage);border-color:var(--ink-3);font-size:16px}
[data-problem-id^="archimedes-winter-"] .interactive-actions button[data-action=play]{color:var(--on-ink);background:var(--ink);border-color:var(--ink)}
[data-problem-id^="archimedes-winter-"] .interactive-range-row{grid-template-columns:minmax(60px,1fr) 88px}
[data-problem-id^="archimedes-winter-"] .cf-number{background:var(--play-stage);color:var(--ink);border-color:var(--ink-3);border-radius:12px;min-height:44px;height:auto;padding:8px 6px;font-size:18px;font-variant-numeric:tabular-nums}
[data-problem-id^="archimedes-winter-"] .interactive-range-row input[type=range]{min-height:44px;accent-color:var(--accent)}
[data-problem-id^="archimedes-winter-"] .interactive-results>div{background:var(--play-stage);border-color:var(--play-line);border-radius:14px;padding:14px 16px;font-size:16px}
[data-problem-id^="archimedes-winter-"] .interactive-results :is(div,span,strong){color:var(--ink)}
[data-problem-id^="archimedes-winter-"] .learning-interactive :is(button,input){scroll-margin-block:120px}
@media(max-width:360px){[data-problem-id="archimedes-winter-2024-2025-mathematics-6-7-task-1-2"] .math-display .katex{font-size:16px}}
/* Keep diagrams readable as diagrams, without the inherited white text outline. */
[data-problem-id^="archimedes-winter-"] :is(.cf-figure-svg,.cf-zoom-content) svg text{stroke:none;paint-order:normal}
[data-problem-id^="archimedes-winter-"] .cf-figure figcaption button[data-cf-zoom]{display:block;margin:14px auto 0}

.arch-lab .arch-cube button{border-radius:999px}
[data-problem-id^="archimedes-winter-"] .arch-model-entry{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;padding:20px 24px;margin:24px 0;border:1px solid var(--play-line);border-radius:var(--r-lg);background:var(--play-bg);color:var(--ink)}
[data-problem-id^="archimedes-winter-"] .arch-model-entry>div{flex:1 1 240px;min-width:0}
[data-problem-id^="archimedes-winter-"] .arch-model-entry strong{font-size:17px}
[data-problem-id^="archimedes-winter-"] .arch-model-entry p{margin:5px 0 0;color:var(--ink-2);font-size:16px;line-height:1.5}
[data-problem-id^="archimedes-winter-"] .arch-model-entry a{display:inline-flex;gap:12px;align-items:center;min-height:44px;padding:10px 16px;border:1px solid var(--ink-3);border-radius:999px;background:var(--play-stage);color:var(--ink);font:600 16px/1.4 var(--font);text-decoration:none}
[data-problem-id^="archimedes-winter-"] .arch-model-entry a:hover{border-color:var(--accent);color:var(--accent)}
[data-problem-id^="archimedes-winter-"] .arch-model-entry a:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
@media(max-width:480px){[data-problem-id^="archimedes-winter-"] .arch-model-entry{padding:16px}[data-problem-id^="archimedes-winter-"] .arch-model-entry a{width:100%;justify-content:space-between}}

[data-problem-id^="archimedes-winter-"] .arch-math-scroll-note{font:400 13px/1.4 var(--font);color:var(--ink-2);margin:4px 0 16px}
[data-problem-id^="archimedes-winter-"] .arch-math-scroll-note[hidden]{display:none}
/* The model entry inherits legacy blue text; use the accepted theme ink in both themes. */
[data-problem-id^="archimedes-winter-"] .lesson-model-disclosure>summary{color:var(--ink)}
[data-problem-id^="archimedes-winter-"] .lesson-model-disclosure>summary .lesson-model-kind{color:var(--ink-2)}