/* Scoped image treatment for BT3 visual lesson prototypes. */
body.bt3-unified .bt3-figure{max-width:760px;margin:22px auto 6px;padding:0;clear:both}
body.bt3-unified .bt3-figure img{display:block;width:100%;height:auto;border:1px solid #d9d4c8;border-radius:12px;background:#f7f5ef;box-shadow:0 4px 16px rgba(16,40,63,.07)}
body.bt3-unified .bt3-figure figcaption{margin-top:8px;color:#4e5b68;font-size:13px;line-height:1.7;text-align:center}
body.bt3-unified .bt3-figure--diagram{max-width:780px}
body.bt3-unified .bt3-figure--diagram img{box-shadow:none}
body.bt3-unified .bt3-figure-open{display:block;width:max-content;max-width:100%;margin:6px auto 0;color:#73551c;font-size:13px;text-underline-offset:3px}
@media(max-width:600px){body.bt3-unified .bt3-figure{margin:17px auto 3px}body.bt3-unified .bt3-figure figcaption{font-size:12px;padding-inline:5px}}
@media print{body.bt3-unified .bt3-figure{break-inside:avoid}body.bt3-unified .bt3-figure img{box-shadow:none}}

/* Compact, lesson-specific diagrams derived from the lesson text. */
body.bt3-unified .bt3-study-visuals{width:min(1100px,calc(100% - 32px));margin:18px auto 23px;padding:20px 22px 14px;background:#fff;border:1px solid #e5dfd2;border-radius:16px;box-shadow:0 3px 12px rgba(25,39,50,.035)}
body.bt3-unified .bt3-study-visuals h2{margin:0 0 13px;padding:0 0 8px;border-bottom:1px solid #eae5d8;color:#173a55;font-size:clamp(20px,2vw,24px);line-height:1.5}
body.bt3-unified .bt3-study-visuals-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
body.bt3-unified .bt3-study-visuals .bt3-figure{max-width:none;min-width:0;margin:0}
body.bt3-unified .bt3-study-visuals .bt3-figure img{aspect-ratio:8/5;object-fit:contain}
body.bt3-unified .bt3-study-visuals .bt3-figure figcaption{text-align:right;padding-inline:2px}
body.bt3-unified .bt3-study-visuals .bt3-figure--photo img{aspect-ratio:3/2;object-fit:cover;background:#e8e4d9}
body.bt3-unified .bt3-photo-credit{display:block;margin-top:5px;font-size:11px;color:#5a6571;line-height:1.6}
body.bt3-unified .bt3-photo-credit a{color:#684c1b;text-underline-offset:2px}
body.bt3-unified .bt3-study-note{margin:13px 0 0;color:#536171;font-size:12px}
@media(max-width:720px){body.bt3-unified .bt3-study-visuals{padding:16px;width:calc(100% - 26px);max-width:100%;overflow:hidden}body.bt3-unified .bt3-study-visuals-grid{grid-template-columns:minmax(0,1fr);gap:20px}}