.world-facts-card{margin-top:15px;border:1px solid var(--line);border-radius:12px;background:var(--surface);padding:20px 22px}
.facts-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:17px}.facts-heading h3{font:22px Georgia,serif}.facts-heading .eyebrow{font-size:7px;letter-spacing:1.2px}
.quick-facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.quick-facts>div{border-right:1px solid var(--line);padding-right:10px}.quick-facts>div:last-child{border:0;padding-right:0}.quick-facts>div>span{display:block;font-size:8px;letter-spacing:.8px;color:var(--muted);margin-bottom:9px}.quick-facts strong{display:block;font-size:25px;letter-spacing:-.7px;font-weight:400;line-height:1.2}.quick-facts small{display:block;font-size:11px;letter-spacing:0;color:var(--muted);margin-top:6px}
.world-fun-fact{display:flex;gap:11px;margin-top:18px;padding-top:17px;border-top:1px solid var(--line);font-size:12px;line-height:1.75;color:var(--muted)}.world-fun-fact>span:first-child{font-size:21px;line-height:1.3;color:var(--accent)}
#clock-details{margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}#clock-details summary{font-size:10px;line-height:1.6;cursor:pointer;display:flex;justify-content:space-between;gap:15px;color:var(--accent)}#clock-explanation{font-size:12px;line-height:1.8;color:var(--muted);padding-top:13px}.clock-footnote{font-size:10px;margin-top:9px}.lesson-entry{width:100%;text-align:left;min-height:44px;background:var(--raised);border-radius:7px;padding:12px;color:var(--accent);font-size:11px;margin:-5px 0 20px}.lesson-entry:hover{background:var(--panel);box-shadow:inset 0 0 0 1px var(--accent)}
.world-lesson{grid-column:1/-1;padding:45px 0 0;border-top:1px solid var(--line);margin-top:30px;scroll-margin-top:20px;min-width:0}.lesson-heading{display:flex;gap:25px;align-items:center;justify-content:space-between;padding-bottom:28px}.lesson-heading h2{font:39px Georgia,serif;letter-spacing:-.8px;margin:12px 0 13px}.lesson-heading p{font-size:14px;color:var(--muted);line-height:1.8}.lesson-heading>button{white-space:nowrap}
.lesson-nav{position:sticky;top:0;z-index:7;display:flex;gap:10px;padding:12px 0;background:var(--bg);border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:auto;scrollbar-width:thin}.lesson-nav button{display:flex;align-items:center;gap:10px;min-height:43px;white-space:nowrap;font-size:12px;flex:1;text-align:left;padding:9px 15px;border-radius:7px}.lesson-nav button:hover{background:var(--raised)}.lesson-nav button>span{font-size:10px;color:var(--accent);font-variant-numeric:tabular-nums}
.lesson-chapter{padding:38px 0;border-bottom:1px solid var(--line);scroll-margin-top:86px}.chapter-title{display:flex;gap:20px;align-items:center;margin-bottom:22px}.chapter-title>span{width:48px;height:56px;display:flex;align-items:center;justify-content:center;font:25px Georgia,serif;background:var(--raised);border:1px solid var(--line);border-radius:8px;color:var(--accent);flex-shrink:0}.chapter-title h3{font:30px Georgia,serif;letter-spacing:-.4px;margin-top:6px;line-height:1.25}.chapter-title h3 em{font-weight:400;color:var(--accent)}.chapter-intro{font-size:14px;line-height:1.8;color:var(--muted);max-width:850px;margin:-3px 0 25px}.lesson-overview{max-width:1040px;font-size:16px;line-height:1.9;color:var(--muted);margin:0 0 28px}
.anatomy-panel{display:grid;grid-template-columns:minmax(250px,.8fr) minmax(0,1.2fr);border:1px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden}.anatomy-visual{padding:22px 30px;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;align-items:center;justify-content:center}#material-map{position:relative;width:100%;max-width:360px;margin:0 auto}#material-map svg{display:block;width:100%;height:auto}.map-caption{text-align:center;margin:-8px 0 18px}.map-caption strong{font:24px Georgia,serif;display:block}.map-caption span{display:block;color:var(--muted);font-size:10px;margin-top:7px;letter-spacing:.5px}.map-scale-note{font-size:10px;line-height:1.75;color:var(--muted);max-width:340px;text-align:center}.anatomy-reader{padding:28px 32px}.layer-options{display:flex;flex-direction:column;gap:6px;margin-top:13px}.layer-options button{display:flex;align-items:center;gap:13px;text-align:left;padding:9px 12px 9px 8px;min-height:46px;border:1px solid transparent;border-radius:7px;color:var(--muted);font-size:12px}.layer-options button[aria-pressed=true]{border-color:var(--line);background:var(--panel);color:var(--ink)}.layer-options button>span{background:var(--zone-colour);color:#233936;border-radius:50%;min-width:26px;height:26px;display:flex;align-items:center;justify-content:center;font-size:10px}.layer-reading{margin-top:22px;padding-top:23px;border-top:1px solid var(--line);min-height:200px}.layer-reading h4{font:26px Georgia,serif;margin:11px 0 12px}.layer-materials{font-size:13px;font-weight:500;color:var(--accent);line-height:1.65;display:block}.layer-reading>p{font-size:13px;color:var(--muted);line-height:1.9;margin-top:13px}.layer-elements{display:flex;flex-wrap:wrap;gap:7px;margin-top:20px}.layer-elements button{min-height:38px;min-width:45px;border:1px solid var(--line);background:var(--panel);color:var(--accent);padding:8px 11px;border-radius:6px;font-size:13px}.external-material{margin:18px 0 0;border-left:3px solid var(--gold);padding:15px 20px;background:var(--panel)}.external-material>span{font-size:8px;letter-spacing:1px;display:block;color:var(--gold)}.external-material strong{font:20px Georgia,serif;display:block;margin:9px 0}.external-material p{font-size:13px;line-height:1.8;color:var(--muted);max-width:1000px}
.birth-layout{display:grid;grid-template-columns:minmax(220px,.65fr) minmax(0,1.35fr);gap:50px}.age-evidence{align-self:start;padding:27px;background:var(--panel);border:1px solid var(--line);border-radius:12px}.age-evidence>strong{font:31px Georgia,serif;color:var(--accent);display:block;margin:15px 0 25px;line-height:1.25}.age-evidence h4{font-size:13px;font-weight:500;margin:0 0 11px}.age-evidence p{font-size:13px;line-height:1.9;color:var(--muted)}.age-footnote{font-size:10px;line-height:1.8;color:var(--muted);display:block;border-top:1px solid var(--line);padding-top:17px;margin-top:19px}.history-event{display:flex;gap:18px;position:relative;padding:0 0 25px}.history-event:not(:last-child):before{content:'';position:absolute;top:32px;bottom:0;left:16px;width:1px;background:var(--line)}.history-node{position:relative;z-index:1;width:33px;height:33px;flex-shrink:0;display:flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:50%;background:var(--surface);font-size:10px;color:var(--accent)}.history-when{font-size:10px;color:var(--accent);line-height:1.7;display:block;padding-top:5px}.history-event h4{font:23px Georgia,serif;margin:7px 0 11px;line-height:1.3}.history-event p{font-size:13px;line-height:1.85;color:var(--muted)}
.lesson-processes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.process-card{border:1px solid var(--line);border-radius:12px;background:var(--surface);padding:25px;display:flex;flex-direction:column}.process-card h4{font:24px Georgia,serif;line-height:1.25;margin:14px 0 20px}.process-formula{padding:17px 14px;background:var(--panel);border:1px solid var(--line);border-radius:7px;color:var(--accent);font-size:18px;line-height:1.5;margin-bottom:19px;overflow-wrap:anywhere}.process-card>p{font-size:13px;line-height:1.85;color:var(--muted);margin-bottom:22px}.process-meaning{border-top:1px solid var(--line);padding-top:17px;margin-top:auto}.process-meaning>span{font-size:8px;letter-spacing:1px;color:var(--accent)}.process-meaning p{font-size:12px;line-height:1.8;margin-top:8px;color:var(--muted)}
.lesson-origins{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:25px;padding:8px 0 26px}.supply-step{position:relative}.supply-step>span{display:flex;align-items:center;justify-content:center;width:37px;height:42px;border:1px solid var(--line);background:var(--raised);border-radius:7px;color:var(--accent);font-size:12px}.supply-step:not(:last-child):after{content:'→';position:absolute;top:10px;left:53px;right:-8px;text-align:right;color:var(--faint);border-top:1px solid var(--line);line-height:0}.supply-step h4{font:22px Georgia,serif;line-height:1.3;margin:17px 0 12px}.supply-step p{font-size:12px;line-height:1.85;color:var(--muted)}.ancestry-elements{display:flex;align-items:center;gap:30px;justify-content:space-between;padding:24px 25px;background:var(--panel);border:1px solid var(--line);border-radius:10px}.ancestry-elements h4{font:22px Georgia,serif;margin:0 0 8px}.ancestry-elements p{font-size:11px;color:var(--muted);line-height:1.7}.lesson-elements{display:flex;gap:9px;flex-wrap:wrap;justify-content:flex-end;max-width:60%}.lesson-elements button{min-width:61px;min-height:66px;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:10px;color:var(--accent);text-align:left;font-size:23px}.lesson-elements button span{display:block;font-size:8px;margin-top:6px;color:var(--muted)}.lesson-sources{padding:27px 0 37px;display:grid;grid-template-columns:1fr 1fr;gap:25px}.lesson-sources>div>p{font-size:12px;line-height:1.9;color:var(--muted);margin-top:9px}.lesson-sources details{padding:0 15px}.lesson-sources summary{font-size:12px;line-height:1.6;display:flex;justify-content:space-between;gap:12px;cursor:pointer;padding:6px 0;color:var(--accent)}.lesson-sources .source-links{display:flex;flex-direction:column;gap:12px;align-items:flex-start}.lesson-sources>button{grid-column:1/-1;justify-self:center}
@media(min-width:1600px){.world-lesson{padding-left:28px;padding-right:28px}.lesson-overview{font-size:17px}.process-card>p,.layer-reading>p,.history-event p,.age-evidence p{font-size:14px}.supply-step p{font-size:13px}}
@media(max-width:1150px){.world-facts-card{padding:18px}.facts-heading .eyebrow{display:none}.quick-facts strong{font-size:22px}.quick-facts>div>span{font-size:7px}.lesson-nav{gap:2px}.lesson-nav button{font-size:11px;padding:8px}.anatomy-reader{padding:25px}.birth-layout{gap:30px}.process-card{padding:21px}.lesson-processes{gap:15px}.lesson-origins{gap:20px}.ancestry-elements{gap:20px}.lesson-heading h2{font-size:35px}}
@media(max-width:900px){.quick-facts{gap:8px}.quick-facts strong{font-size:20px}.quick-facts small{font-size:9px}.quick-facts>div>span{font-size:6px;letter-spacing:.4px}.world-facts-card{padding:16px}.facts-heading h3{font-size:20px}.world-fun-fact{font-size:11px}.anatomy-panel{grid-template-columns:.8fr 1.2fr}.anatomy-visual{padding:18px}.anatomy-reader{padding:22px}.birth-layout{grid-template-columns:250px minmax(0,1fr);gap:25px}.age-evidence{padding:22px}.age-evidence>strong{font-size:27px}.lesson-processes{grid-template-columns:1fr}.process-card{display:block}.process-card>p{margin-bottom:18px}.process-card h4{margin:12px 0 15px}.process-formula{display:inline-block;min-width:180px;padding:13px 18px}.lesson-origins{grid-template-columns:repeat(2,minmax(0,1fr));gap:25px 35px}.supply-step:nth-child(2):after{display:none}.ancestry-elements{align-items:flex-start;flex-direction:column}.lesson-elements{max-width:100%;justify-content:flex-start}.lesson-sources{gap:20px}}
@media(max-width:700px){.world-facts-card{padding:20px}.facts-heading h3{font-size:22px}.quick-facts{gap:10px}.quick-facts strong{font-size:23px}.quick-facts small{font-size:10px}.quick-facts>div>span{font-size:7px;letter-spacing:.6px}.world-fun-fact{font-size:12px}.world-lesson{margin-top:10px;padding-top:30px}.lesson-heading{display:block;padding-bottom:20px}.lesson-heading h2{font-size:33px;line-height:1.2}.lesson-heading p{font-size:12px}.lesson-heading>button{margin-top:9px;padding-left:0}.lesson-nav{margin:0 -16px;padding:9px 16px;gap:5px}.lesson-nav button{flex:none;font-size:11px;min-height:43px;padding:9px 12px;background:var(--surface);border:1px solid var(--line)}.lesson-chapter{padding:29px 0;scroll-margin-top:80px}.chapter-title{gap:13px;margin-bottom:20px;align-items:flex-start}.chapter-title>span{width:38px;height:46px;font-size:22px}.chapter-title .eyebrow{font-size:7px;letter-spacing:1px}.chapter-title h3{font-size:26px;line-height:1.3}.chapter-intro{font-size:12px;margin-bottom:20px}.lesson-overview{font-size:14px;line-height:1.9}.anatomy-panel{grid-template-columns:1fr}.anatomy-visual{border-right:0;border-bottom:1px solid var(--line);padding:15px 22px 23px}#material-map{max-width:260px}.map-caption strong{font-size:23px}.map-caption{margin:-8px 0 13px}.map-scale-note{font-size:10px}.anatomy-reader{padding:24px 22px}.layer-options button{font-size:12px}.layer-reading{min-height:0}.layer-reading h4{font-size:25px}.layer-reading>p{font-size:13px}.birth-layout{grid-template-columns:1fr;gap:27px}.age-evidence{padding:23px}.age-evidence>strong{font-size:30px;margin:13px 0 21px}.history-event{gap:13px}.history-event h4{font-size:23px}.history-event p{font-size:13px}.lesson-processes{gap:15px}.process-card{padding:24px}.process-card h4{font-size:25px}.process-formula{font-size:18px;max-width:100%}.lesson-origins{grid-template-columns:1fr;gap:0;padding:0}.supply-step{border-left:1px solid var(--line);margin-left:18px;padding:0 0 26px 32px}.supply-step>span{position:absolute;left:-18px;top:0}.supply-step:not(:last-child):after{display:none}.supply-step h4{font-size:23px;margin:5px 0 12px}.supply-step p{font-size:13px}.supply-step:last-child{border-left-color:transparent}.ancestry-elements{padding:22px;margin-top:10px}.lesson-elements{gap:8px}.lesson-elements button{min-width:62px}.lesson-sources{grid-template-columns:1fr;gap:18px}.lesson-sources details{padding:0}.lesson-sources .source-links a{font-size:11px}.lesson-entry{font-size:12px}.external-material{padding:17px}.external-material p{font-size:12px}}
@media(prefers-reduced-motion:reduce){.world-lesson *{scroll-behavior:auto}}

.science-words{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:-8px 0 26px}.science-words summary{display:flex;justify-content:space-between;gap:15px;cursor:pointer;min-height:46px;align-items:center;font-size:12px;color:var(--accent);padding:10px 0}.science-words dl{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px 30px;margin:8px 0 23px}.science-words dt{font:20px Georgia,serif;margin-bottom:8px}.science-words dd{margin:0;font-size:12px;color:var(--muted);line-height:1.8}@media(max-width:900px){.science-words dl{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){.science-words dl{grid-template-columns:1fr;gap:19px}.science-words summary{font-size:11px}.science-words dd{font-size:12px}}