#unit-explainer{box-sizing:border-box;position:fixed;inset:0;top:var(--dc-space,0px);height:calc(100dvh - var(--dc-space,0px));max-height:none;width:100vw;max-width:none;margin:0;border:0;padding:0;background:#f8f8f2;color:#17333b;overflow:auto}#unit-explainer::backdrop{background:#17333b}#unit-explainer[hidden]{display:none}.explainer-toolbar{position:sticky;top:0;z-index:2;display:flex;align-items:center;flex-wrap:wrap;gap:10px;padding:12px 20px;background:#fff;border-bottom:3px solid #c5a65b}.explainer-toolbar strong{font-size:18px}.explainer-controls{display:flex;flex-wrap:wrap;gap:8px;margin-left:auto}#unit-explainer button{font-size:14px;padding:8px 11px;min-height:38px;margin:0;white-space:nowrap}#unit-explainer #explainer-play{background:#176b61;color:white}#unit-explainer #explainer-sound[aria-pressed=false]{background:#f5e7c3;color:#17333b}.explainer-position{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:12px 24px;font-size:14px;color:#486059}.explainer-position progress{flex:1;min-width:100px;height:8px;accent-color:#176b61}.explainer-position select{font:inherit;padding:7px;max-width:320px;border:1px solid #aec3b9;border-radius:7px;background:#fff;color:#17333b}#explainer-scene{max-width:1400px;margin:auto;padding:16px 36px 28px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:32px;align-items:center;min-height:48vh}.explainer-illustration{background:#eef4ec;border:1px solid #d7e1d3;border-radius:24px;overflow:hidden}.explainer-illustration img{display:block;width:100%;height:auto;max-height:44vh;object-fit:contain}.explainer-kicker{font-size:13px;letter-spacing:.1em;color:#61735e}#explainer-title{font-size:clamp(30px,3.5vw,54px);line-height:1.12;margin:8px 0 18px}#explainer-lead{font-size:clamp(19px,2vw,27px);line-height:1.4;margin:0 0 24px}#explainer-points{display:grid;gap:12px;list-style:none;padding:0;margin:0}#explainer-points li{font-size:clamp(17px,1.7vw,23px);line-height:1.4;border-left:4px solid #c5a65b;border-radius:0 9px 9px 0;padding:12px 16px;background:#fff}.explainer-captions{position:sticky;top:var(--explainer-toolbar-height,80px);background:#101820;color:#fff;padding:14px 28px;border-top:3px solid #c5a65b;z-index:1;min-height:96px;box-sizing:border-box}#explainer-caption{max-width:1200px;margin:4px auto;font-size:clamp(20px,2.1vw,30px);line-height:1.4;white-space:pre-wrap}#explainer-status{display:block;max-width:1200px;margin:auto;color:#f0d899;font-size:13px}.explainer-transcript{max-width:1200px;margin:20px auto;padding:0 24px 30px;font-size:18px;line-height:1.6}.explainer-transcript summary{font-weight:650;cursor:pointer}.explainer-transcript h3{font-size:22px}.explainer-transcript a{color:#176b61}@media(prefers-reduced-motion:reduce){#unit-explainer *{animation:none!important;transition:none!important}}#unit-explainer:focus-visible{outline:none}#unit-explainer button:focus-visible,#unit-explainer select:focus-visible{outline:3px solid #c5a65b;outline-offset:3px}body.explainer-running{overflow:hidden}@media(max-width:700px){.explainer-toolbar{padding:10px;gap:8px}.explainer-controls{margin-left:0;gap:6px}.explainer-position{padding:10px 14px}.explainer-position select{max-width:100%}#explainer-scene{padding:12px 16px 24px;grid-template-columns:1fr;gap:16px;min-height:0}.explainer-illustration img{max-height:22vh}.explainer-illustration{border-radius:14px}#explainer-lead{margin-bottom:14px}#explainer-points{gap:8px}#explainer-points li{padding:9px 12px}.explainer-captions{padding:12px 16px}#explainer-title{font-size:30px}}

/* Detailed unit diagrams need room for labels at classroom and phone sizes. */
#explainer-scene{grid-template-columns:minmax(0,1.8fr) minmax(260px,.8fr);gap:24px;padding:16px 24px 28px;align-items:start}
.explainer-illustration img{max-height:none}
#explainer-title{font-size:clamp(28px,2.7vw,40px)}
#explainer-lead{font-size:clamp(19px,1.6vw,24px)}
#explainer-points li{font-size:clamp(17px,1.4vw,21px)}
@media(max-width:1100px){#explainer-scene{grid-template-columns:1fr;max-width:1000px}.explainer-illustration img{max-height:none}#explainer-points{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:700px){#explainer-scene{padding:12px 10px 24px}#explainer-points{grid-template-columns:1fr}.explainer-illustration{overflow:auto;-webkit-overflow-scrolling:touch}.explainer-illustration img{min-width:720px;max-width:none;width:100%;max-height:none}.explainer-illustration:after{content:"Swipe across the diagram to see all labels";display:block;position:sticky;left:0;width:calc(100vw - 44px);box-sizing:border-box;padding:8px 10px;font-size:13px;color:#486059;background:#eef4ec}}

/* Explainer cards use explicit paired colours in every appearance mode. */
#unit-explainer #explainer-points li{color:#17333b}
html[data-appearance="dark"] #unit-explainer #explainer-points li{background:#283746!important;color:#f1f5f8!important;border-left-color:#d6b873}
html[data-appearance="dark"] #unit-explainer .explainer-position{color:#dbe6ee}
html[data-reading-contrast="high"] #unit-explainer #explainer-points li{background:#fff!important;color:#000!important;border:2px solid #000;border-left-width:4px}
html[data-reading-contrast="high"][data-appearance="dark"] #unit-explainer #explainer-points li{background:#000!important;color:#fff!important;border-color:#fff}
#unit-explainer #explainer-caption{color:#fff!important}