.explorer-nav{display:flex;gap:24px;padding:15px 5%;border-bottom:1px solid #dfc88b30;background:#1d281a;overflow:auto;font-size:14px;white-space:nowrap}.explorer-nav a{color:#c6cdb9}.explorer-nav a.active{color:#f0c16d}.context-link{color:#d9dda8;border-bottom:1px solid #a9bb6f55}.context-link:hover{color:var(--gold)}.discovery{background:linear-gradient(120deg,#1c2a20,#111c1a)}.discovery-grid{display:grid;grid-template-columns:1.7fr 1fr;gap:22px}.world-card{grid-row:span 2;position:relative;min-height:540px;border:1px solid #aac48b70;border-radius:15px;overflow:hidden;background:#101d1c}.world-card>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.9;transition:transform 1s}.world-card:hover>img{transform:scale(1.08)}.world-card>div{position:absolute;inset:0;padding:35px;display:flex;flex-direction:column;justify-content:end;background:linear-gradient(transparent 10%,#10201add 70%,#0d1818)}.world-card h3{font-size:42px;margin-bottom:10px}.world-card p{color:#d4dec5}.world-card .round-link{position:absolute;bottom:40px;right:30px}.discovery-small{padding:28px;min-height:260px;border:1px solid #d6c89650;border-radius:12px;position:relative;overflow:hidden}.discovery-small h3{font-size:34px;margin-bottom:25px}.discovery-small>span:last-child{font-size:14px;color:#e4d6b6}.mountain-discovery{background:linear-gradient(90deg,#131d16e8,#131d1640),var(--scene) center/cover}.time-discovery{background:linear-gradient(110deg,#352941 0 70%,#80965b 70% 86%,#bd9860 86% 96%,#c97354 96%)}.topic-pills{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.topic-pills a{padding:10px 20px;border:1px solid #c4c39360;border-radius:50px;font-size:15px;color:#e0dcbe}.topic-pills a:hover{background:#e1c174;color:#142013}.topic-hero,.range-hero{position:relative;min-height:540px;background:linear-gradient(90deg,#0f1a13e0,#0f1a1338),linear-gradient(0deg,#141714,transparent 70%),var(--scene) center/cover;padding:50px 5.5%;display:flex;align-items:end}.topic-hero h1,.range-hero h1{font-size:clamp(3.6rem,6.5vw,7rem);max-width:1100px}.topic-hero p,.range-hero p{font-size:21px;color:#e0e2d0}.topic-hero .breadcrumbs,.range-hero .breadcrumbs{margin-bottom:70px}.plate-tectonics{--accent:#91d8c2}.mountain-building{--accent:#bddf95}.volcanism{--accent:#ffa079}.lesson-section{background:linear-gradient(130deg,#243324,#171f18)}.lesson-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:24px}.lesson-tabs button{border:1px solid #d7dab14d;border-radius:40px;padding:11px 23px;color:#d5ddc7}.lesson-tabs button[aria-pressed=true]{background:var(--accent);color:#162013;border-color:var(--accent)}#lesson-diagram{border:1px solid #bfc69c55;border-radius:16px;overflow:hidden}#lesson-diagram svg{display:block;width:100%;max-height:510px}.diagram-labels{fill:#eee8cf;font-family:'DM Sans',sans-serif;font-size:19px}.lesson-progress{display:flex;gap:20px;align-items:center;margin-top:24px;font-size:15px}.lesson-progress input{flex:1;accent-color:var(--accent);min-width:100px}.lesson-progress output{min-width:45px}.diagram-note{color:#afb9a2;font-size:13px;margin-top:17px}.lesson-explanation{display:grid;grid-template-columns:1fr 2fr;gap:30px;margin-top:30px;border-top:1px solid var(--line);padding-top:30px}.lesson-explanation h3{color:var(--accent);font-size:29px}.lesson-explanation p{color:#cdd8c2;font-size:18px;max-width:780px}.topic-copy{display:grid;grid-template-columns:.7fr 1.5fr;gap:8%}.topic-copy-aside{position:sticky;top:35px;align-self:start}.topic-copy-aside h2{font-size:40px}.lesson-copy-block{display:grid;grid-template-columns:34px 1fr;gap:18px;padding-bottom:32px;margin-bottom:30px;border-bottom:1px solid var(--line)}.lesson-index{font-size:12px;color:var(--accent);padding-top:6px}.lesson-copy-block h3{font-size:26px;line-height:1.35;letter-spacing:-.025em;margin-bottom:18px}.lesson-copy-block p{color:#c7d0be;font-size:18px;line-height:1.85}.related-section{background:#232b1d}.mountain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.mountain-card{position:relative;min-height:440px;overflow:hidden;border:1px solid #b5c29460;border-radius:12px;background:#202e20}.mountain-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .8s}.mountain-card:hover img{transform:scale(1.07)}.mountain-card>div{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:end;padding:26px;background:linear-gradient(transparent,#0b1a0de8 75%)}.mountain-card .eyebrow{font-size:10px;letter-spacing:.1em;margin-bottom:13px}.mountain-card h3{font-size:32px;margin-bottom:12px}.mountain-card p{font-size:14px;color:#d7dec9;margin-right:25px}.mountain-card .round-link{align-self:end}.range-hero{min-height:660px;padding-bottom:80px}.range-hero .photo-source{position:absolute;bottom:20px;left:5.5%;right:5.5%;font-size:12px;color:#d6dccb}.photo-source a{text-decoration:underline}.range-story{display:grid;grid-template-columns:.8fr 1.5fr;gap:10%}.range-story aside h2{font-size:38px;color:#c4d99d}.range-story .prose h2{font-size:36px}.time-link{display:block;margin-top:25px;font-size:15px;color:var(--gold)}.time-exhibit{background:linear-gradient(125deg,#282038,#202b1d 65%,#2c2a1d)}.time-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:35px}.time-toolbar h2{margin:0}.outline-button{border:1px solid #c4c69b80;border-radius:8px;padding:10px 16px;font-size:14px;line-height:1.5}.outline-button:hover{background:#364529}.timeline-labels{display:flex;justify-content:space-between;color:#d0d3c0;font-size:13px;margin-bottom:12px}.timeline-track{height:110px;display:flex;position:relative;border-radius:7px;box-shadow:0 14px 45px #0004}.era-band{padding:0;min-width:0;height:100%;border-right:1px solid #1115}.era-band:first-child{border-radius:7px 0 0 7px}.era-band:last-of-type{border-radius:0 7px 7px 0}.era-band:hover{filter:brightness(1.16)}.time-cursor{position:absolute;top:-9px;bottom:-10px;width:2px;background:#fff;box-shadow:0 0 10px #fff;pointer-events:none}.time-cursor:before{content:'';position:absolute;left:-5px;top:-1px;width:12px;height:12px;border-radius:50%;background:white}.era-legend{display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;margin-top:28px}.era-legend button{display:flex;gap:10px;padding:0;align-items:start;text-align:left;font-size:16px}.era-legend i{display:block;width:13px;height:13px;border-radius:3px;margin-top:6px;flex-shrink:0}.era-legend small{display:block;color:#adb9a2;font-size:12px;margin-top:5px}.timeline-marks{height:150px;position:relative;margin-top:15px}.timeline-marks a{position:absolute;width:24px;height:16px;transform:translateX(-50%)}.timeline-marks span{display:block;margin:auto;width:10px;height:10px;background:#e5ca80;border:2px solid #29391b;border-radius:50%}.time-controls{margin-top:10px}.time-controls label{display:flex;justify-content:space-between;font-size:15px}.time-controls output{color:#ecd79f}.time-controls input{width:100%;accent-color:#d9c58a;margin:20px 0;direction:rtl}.time-presets{display:flex;gap:9px;flex-wrap:wrap}.time-presets button{border:1px solid #c1c3a04a;border-radius:30px;padding:7px 13px;font-size:13px}.time-presets button:hover{background:#657149}#era-reading{display:grid;grid-template-columns:1fr 1.5fr;gap:35px;border-top:1px solid var(--line);margin-top:40px;padding-top:35px}#era-reading p{font-size:19px;color:#d7ddc7}.time-events{display:grid;grid-template-columns:repeat(3,1fr);gap:25px;margin-bottom:40px}.time-events article{padding:28px;border:1px solid #b8c89544;border-radius:10px;background:#202b1e}.time-events button{font-size:13px;border-bottom:1px solid #c9b279;color:#e6c77e;padding:0;margin-bottom:22px}.time-events h3{font-size:27px}.time-events p{font-size:15px;color:var(--muted)}.time-events a{font-size:14px;color:#cddd99}.map-intro{padding:35px 4%;display:flex;justify-content:space-between;align-items:end;gap:30px}.map-intro h1{font-size:clamp(2.7rem,4vw,4.5rem);margin:0}.map-intro p{color:#c0cbb3;font-size:16px;margin:0}.map-intro .eyebrow{margin-bottom:15px}.map-exhibit{display:grid;grid-template-columns:285px 1fr;gap:0;margin:0 3%;border:1px solid #9cb78955;border-radius:15px;overflow:hidden;background:#16221e}.map-sidebar{padding:25px 21px;background:#1f2c20;border-right:1px solid #d0dbb32a}.map-sidebar h2{font-size:24px;letter-spacing:-.025em}.map-sidebar>p{font-size:14px;color:#b6c8ac;line-height:1.6}.map-layer-options{margin:25px 0}.layer-option{display:flex;gap:10px;align-items:center;cursor:pointer;padding:13px 0;border-top:1px solid #d4dcb426;font-size:14px}.layer-option input{width:17px;height:17px;accent-color:#c2d497;flex-shrink:0}.layer-option small{display:block;color:#a9bba0;font-size:12px;margin-top:5px;line-height:1.4}.layer-option strong{font-weight:500;font-size:15px}.layer-swatch{width:5px;height:35px;display:block;border-radius:4px;flex-shrink:0}.layer-status{font-size:11px;color:#d6c994;line-height:1.5;padding:0 0 10px 27px;overflow-wrap:anywhere}.layer-status:empty{display:none}.map-select{font-size:13px;display:block;color:#c9d1bc}.map-select select,.map-record-controls select{background:#152118;color:#eee9d6;border:1px solid #b3c29270;border-radius:7px;padding:10px;max-width:100%;width:100%;margin:8px 0 15px;font-size:14px}.map-sidebar .outline-button{width:100%;font-size:13px}.map-sidebar .text-button{margin-top:18px;font-size:13px}#map-legend{border-top:1px solid var(--line);margin-top:22px;padding-top:18px}#map-legend h3{font-size:18px;margin-bottom:13px}#map-legend>span{display:flex;align-items:center;gap:9px;font-size:12px;color:#c9d2bf;margin-top:8px}#map-legend i{width:16px;height:3px;display:block}#map-legend small{display:block;font-size:11px;color:#b8c1aa;margin-top:8px}.map-canvas-wrap{position:relative;min-height:730px}#geologic-map{width:100%;height:100%;min-height:730px;background:#0d1d20;font-family:'DM Sans',sans-serif}.map-caption{position:absolute;z-index:500;bottom:28px;left:15px;border:1px solid #a6bd8750;background:#17261fed;padding:8px 14px;border-radius:30px;font-size:12px;color:#d6dfc8;pointer-events:none}.map-loading{position:absolute;z-index:700;inset:0;background:#0c1d20e8;display:grid;place-items:center;color:#e3d39f;text-align:center;padding:20px}.map-loading[hidden]{display:none}.leaflet-popup-content-wrapper,.leaflet-popup-tip{background:#edf0dd;color:#1c2b1f}.leaflet-popup-content{font-size:14px;line-height:1.55}.leaflet-popup-content strong{font-size:17px}.leaflet-popup-content a{color:#44652b;text-decoration:underline}.leaflet-container .leaflet-control-attribution{background:#142019dd;color:#ccd7be;font-size:10px}.leaflet-control-attribution a{color:#eddaaa}.leaflet-bar a{background:#e1e5cc;color:#1d2a1a}.map-below{padding:35px 4%;display:grid;grid-template-columns:1.4fr 1fr;gap:8%;border-bottom:1px solid var(--line)}.map-below h2{font-size:28px}.map-below h3{font-size:24px}.map-below p{font-size:14px;color:#b6c5ae}.map-record-controls{display:grid;grid-template-columns:1fr 1fr;gap:25px}.map-record-controls label{font-size:15px;color:#d4dec4}.quake-list{margin-top:35px}.quake-list>button{display:flex;align-items:center;gap:20px;width:100%;text-align:left;padding:18px;border-top:1px solid var(--line)}.quake-list>button:hover{background:#26351f}.quake-list strong{color:#efd48b;font-size:22px;white-space:nowrap}.quake-list small{display:block;color:var(--muted);font-size:12px;margin-top:5px}.quake-list>button>span:last-child{margin-left:auto}.source-cards{display:grid;grid-template-columns:1fr 1fr;gap:40px}.source-cards h2{font-size:32px}.source-cards p{color:#c2ccba;font-size:16px}.source-cards a{display:block;margin:10px 0;font-size:14px;color:#e1ca8b;text-decoration:underline}.term-definition{max-width:900px;margin:auto}.term-definition>p{font-size:24px;line-height:1.7;color:#d3dfc4}.term-definition .term-related{padding-top:35px;margin-top:35px;border-top:1px solid var(--line)}.term-related h2{font-size:30px}.term-related a{display:inline-block;margin:6px 16px 6px 0;color:#e4ca83}.planned-spec{max-width:800px}.planned-spec li{margin-bottom:12px}.glossary-entry h3 a{color:inherit}.glossary-entry h3 a:hover{color:var(--gold)}
@media(max-width:1100px){.map-exhibit{grid-template-columns:250px 1fr}.map-sidebar{padding:22px 16px}.mountain-grid{grid-template-columns:repeat(2,1fr)}.topic-copy{gap:5%}.world-card h3{font-size:35px}.discovery-grid{grid-template-columns:1.3fr 1fr}.time-events{grid-template-columns:1fr 1fr}}
@media(max-width:800px){.explorer-nav{gap:20px;padding:13px 5%;font-size:13px}.discovery-grid{grid-template-columns:1fr}.world-card{grid-row:auto;min-height:420px}.discovery-small{min-height:240px}.topic-hero,.range-hero{min-height:470px;padding:35px 5% 65px}.topic-hero h1,.range-hero h1{font-size:3.8rem}.range-hero .photo-source{font-size:10px}.lesson-explanation,.topic-copy,.range-story,#era-reading{grid-template-columns:1fr;gap:15px}.topic-copy-aside{position:static;margin-bottom:30px}.lesson-copy-block{grid-template-columns:25px 1fr;gap:12px}.lesson-copy-block p{font-size:17px}.lesson-progress{gap:10px;flex-wrap:wrap}.lesson-progress label{width:100%;font-size:14px}.lesson-tabs button{padding:9px 16px;font-size:14px}.diagram-labels{font-size:23px}.time-toolbar{display:block}.time-toolbar button{margin-top:20px}.time-events{grid-template-columns:1fr 1fr;gap:14px}.time-events article{padding:22px}.era-legend{display:grid;grid-template-columns:1fr 1fr}.timeline-track{height:90px}.map-intro{display:block;padding:30px 5%}.map-intro h1{font-size:2.8rem}.map-intro p{margin-top:18px}.map-exhibit{grid-template-columns:1fr;margin:0 3%}.map-sidebar{border-right:0;padding:22px}.map-sidebar>p{margin-bottom:12px}.map-layer-options{display:grid;grid-template-columns:1fr 1fr;gap:0 18px;margin:15px 0}.layer-status{grid-column:1/-1}.map-sidebar .outline-button{width:auto}.map-sidebar .text-button{margin-left:20px}#map-legend{display:flex;flex-wrap:wrap;gap:7px 15px;padding-top:13px;margin-top:15px}#map-legend h3{width:100%;margin:0}#map-legend>span{margin:0}.map-canvas-wrap,#geologic-map{min-height:500px;height:500px}.map-caption{font-size:10px;bottom:33px;left:10px;padding:7px 10px}.map-below{grid-template-columns:1fr;gap:25px;padding:30px 5%}.map-record-controls{grid-template-columns:1fr;gap:0}.source-cards{grid-template-columns:1fr}.map-select{max-width:250px}.term-definition>p{font-size:21px}}
@media(max-width:500px){.mountain-grid,.time-events{grid-template-columns:1fr}.mountain-card{min-height:430px}.world-card{min-height:400px}.world-card>div{padding:26px}.world-card h3{font-size:32px}.topic-hero h1,.range-hero h1{font-size:3.1rem}.topic-hero p,.range-hero p{font-size:17px}.lesson-copy-block h3{font-size:24px}.time-controls label{display:block}.time-controls output{display:block;margin-top:8px}.era-legend button{font-size:14px}.era-legend small{font-size:11px}.time-presets button{font-size:12px}.diagram-labels{font-size:25px}.map-layer-options{display:block}.map-sidebar h2{margin-bottom:12px}.layer-option{padding:10px 0}.map-canvas-wrap,#geologic-map{min-height:440px;height:440px}.map-exhibit{margin:0 2%}.map-intro h1{font-size:2.5rem}}
@media(prefers-reduced-motion:reduce){.world-card:hover>img,.mountain-card:hover img{transform:none}}
.identification-label{font-size:13px;color:var(--accent);letter-spacing:.07em;text-transform:uppercase;margin-bottom:12px}.term[href]{cursor:help}.source-cards article{border-top:1px solid var(--line);padding-top:30px}
@media(max-width:800px){header>nav{overflow-x:auto;white-space:nowrap;justify-content:flex-start;gap:22px;padding-bottom:2px}header>nav>a{flex-shrink:0}}
/* Native animated exhibits: no generated video or external generation service. */
.topic-hero{min-height:330px;padding-top:32px;padding-bottom:38px}.topic-hero .breadcrumbs{margin-bottom:30px}.topic-hero h1{font-size:clamp(3rem,5.5vw,5.8rem);margin-bottom:17px}.lesson-section{padding-top:50px;background:radial-gradient(ellipse at 15% 40%,#35472a70,transparent 65%),#151e17}.lesson-section .section-heading h2{font-size:clamp(2rem,3.6vw,3.5rem)}.lesson-tabs{gap:13px}.lesson-tabs button{border-radius:9px;padding:12px 24px;border-bottom-width:3px;background:#253020;box-shadow:0 7px 15px #0002}.lesson-tabs button[aria-pressed=true]{box-shadow:0 7px 28px color-mix(in srgb,var(--accent),transparent 83%);font-weight:600}#lesson-diagram{border:1px solid #cad79760;border-radius:19px 19px 0 0;box-shadow:0 20px 70px #0006;position:relative;background:#10211b}#lesson-diagram svg{max-height:580px}#lesson-diagram:after{content:'';position:absolute;inset:0;pointer-events:none;box-shadow:inset 0 -35px 60px #07140b60;border-radius:inherit}.diagram-labels{paint-order:stroke;stroke:#102019;stroke-width:5px;stroke-linejoin:round;font-size:19px;fill:#f1ebd5;letter-spacing:.025em}.exhibit-console{display:flex;align-items:center;gap:25px;padding:22px 25px;background:linear-gradient(100deg,#293523,#19271c);border:1px solid #cad79760;border-top:0;border-radius:0 0 16px 16px;position:relative;z-index:1}.exhibit-play{display:inline-flex;align-items:center;justify-content:center;gap:12px;background:#e4c37b;color:#182114;border:1px solid #f0d39c;border-radius:9px;padding:13px 21px;min-height:50px;font-size:15px;font-weight:600;white-space:nowrap;box-shadow:0 5px 22px #e4c37b20}.exhibit-play>span:first-child{font-size:19px;line-height:1}.exhibit-play:hover{background:#f2d898;box-shadow:0 5px 30px #e4c37b35}.exhibit-play[aria-pressed=true]{background:#cfdfa5;border-color:#e2f0c2}.exhibit-chapters{display:flex;flex:1;gap:13px;justify-content:center}.exhibit-chapters button{position:relative;overflow:hidden;display:flex;align-items:center;gap:10px;padding:11px 16px;min-height:48px;font-size:14px;border:1px solid #bfcea344;border-radius:7px;color:#b9c6ab;background:#182319;flex:1;max-width:180px;white-space:nowrap}.exhibit-chapters button>span{display:grid;place-items:center;width:25px;height:25px;border:1px solid #8f9f7870;border-radius:50%;font-size:10px;color:#d5deb9}.exhibit-chapters button:after{content:'';position:absolute;left:0;bottom:0;width:var(--stage-fill,0%);height:2px;background:var(--accent,#e4c37b)}.exhibit-chapters button[aria-pressed=true]{color:#f3eed6;border-color:#d5d99b99;background:#3b492a}.exhibit-chapters button[aria-pressed=true]>span{background:#d0cf93;color:#1a2214;border-color:#d0cf93}.exhibit-replay{display:flex;align-items:center;gap:7px;padding:12px 0;font-size:24px;color:#c8d5b3}.exhibit-replay span{font-size:12px}.exhibit-caption{display:flex;gap:20px;padding:25px 6px 8px;min-height:115px;max-width:950px}.caption-number{font-family:Georgia,serif;font-size:42px;line-height:1;color:#c0cba0;opacity:.7}.exhibit-caption h3{font-size:23px;color:#ede6ca;margin-bottom:8px;letter-spacing:-.025em}.exhibit-caption p{font-size:16px;color:#bdcdb1;margin:0}.lesson-explanation{padding-top:25px;margin-top:20px}.lesson-explanation h3{font-size:26px}.lesson-explanation p{font-size:16px}.cycle-process{max-width:1060px;padding:28px;background:linear-gradient(130deg,#2c3924,#142117);box-shadow:0 25px 80px #0004}.cycle-process>h3{font-size:34px;margin-top:10px}.cycle-animation-exhibit{margin-top:25px;margin-bottom:28px}#cycle-scene{border:1px solid #cad79760;border-radius:12px 12px 0 0;overflow:hidden}#cycle-scene svg{display:block;width:100%}.cycle-animation-exhibit .exhibit-console{gap:18px;padding:18px}.cycle-animation-exhibit .exhibit-chapters{gap:8px}.cycle-animation-exhibit .exhibit-chapters button{padding:9px 12px}.cycle-animation-exhibit .exhibit-play{font-size:14px;padding:12px 16px}.cycle-animation-exhibit .exhibit-caption{min-height:100px}.cycle-animation-exhibit .diagram-note{font-size:12px}.time-exhibit{background:radial-gradient(ellipse at 12% 10%,#5f466747,transparent 65%),linear-gradient(120deg,#222831,#1a2b22)}#epoch-scene{height:290px;position:relative;overflow:hidden;border:1px solid #d8d6b65e;border-radius:15px;margin-bottom:38px;background:#19251c}#epoch-scene img{position:absolute;width:100%;height:100%;object-fit:cover;filter:brightness(.65) saturate(.85);animation:epoch-enter .7s ease-out}#epoch-scene>div{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;padding:32px 40px;background:linear-gradient(90deg,#112219ee,#18232010);animation:epoch-caption .5s ease-out}#epoch-scene h2{font-size:clamp(2rem,3.3vw,3.3rem);margin-bottom:12px}#epoch-scene .eyebrow{font-size:12px;color:#e5c991}#epoch-scene p{font-size:17px;color:#d0ddc2;margin:0}.epoch-photo-note{position:absolute;bottom:14px;right:20px;left:20px;text-align:right;font-size:11px;color:#dce5d0;text-shadow:0 1px 5px #000}.timeline-track{height:90px;border:1px solid #d6d4b944;overflow:visible;box-shadow:0 18px 40px #0004}.era-band{position:relative;background-image:linear-gradient(180deg,#ffffff15,#00000025)!important}.era-band:before{content:'';position:absolute;inset:10px 0;background:repeating-linear-gradient(90deg,transparent 0 25px,#ffffff12 25px 26px)}.time-cursor{transition:left .7s ease;z-index:2}.era-legend{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:28px}.era-legend button{padding:16px;background:#213027;border:1px solid #c3cda446;border-radius:9px;min-height:84px;transition:background .2s}.era-legend button:hover{background:#39452e;border-color:#d9d3a4}.era-legend i{width:9px;height:43px;border-radius:4px;flex-shrink:0;margin-top:0}.era-legend small{line-height:1.5}.time-tour-header{display:flex;justify-content:space-between;align-items:center;gap:22px;margin-bottom:23px}.time-tour-header .eyebrow{margin-bottom:12px}.time-tour-header output{display:block;font-family:Manrope,sans-serif;font-size:clamp(1.6rem,2.7vw,2.7rem);letter-spacing:-.03em;color:#f1e8cd;line-height:1.2}.time-presets{gap:10px}.time-presets button{background:#263a2b;border:1px solid #a5ba8970;border-radius:8px;padding:12px 17px;color:#d1dbc0;min-height:46px}.time-presets button[aria-pressed=true]{background:#e5c583;border-color:#f1d898;color:#192514}.timeline-marks{height:150px}.timeline-marks a{height:22px;width:30px}.timeline-marks span{width:12px;height:12px;border:1px solid #f0daa0;box-shadow:0 0 12px #dcbc7245}.time-events article:has(button[aria-pressed=true]){border-color:#e5c583;background:#34402a}@keyframes epoch-enter{from{opacity:.3;transform:scale(1.035)}to{opacity:1;transform:scale(1)}}@keyframes epoch-caption{from{opacity:.2;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:1100px){.exhibit-console{gap:14px;padding:18px}.exhibit-chapters{gap:8px}.exhibit-chapters button{padding:10px}.exhibit-play{padding:12px 16px;font-size:14px}.exhibit-replay span{display:none}.era-legend{grid-template-columns:repeat(2,1fr)}}
@media(max-width:800px){.topic-hero{min-height:290px}.topic-hero h1{font-size:3.5rem}.lesson-section{padding-top:38px}.exhibit-console{flex-wrap:wrap;justify-content:space-between;padding:17px}.exhibit-play{order:0}.exhibit-replay{order:1;padding:8px}.exhibit-replay span{display:inline}.exhibit-chapters{order:2;flex-basis:100%;max-width:none;margin-top:5px}.exhibit-chapters button{max-width:none;justify-content:center}.exhibit-caption{padding:23px 4px;gap:15px;min-height:130px}.exhibit-caption h3{font-size:22px}.exhibit-caption p{font-size:15px}.cycle-process{padding:21px}.cycle-process>h3{font-size:28px}.cycle-animation-exhibit .exhibit-console{padding:14px}.cycle-animation-exhibit .exhibit-chapters button{font-size:12px;padding:10px 5px;gap:6px}.cycle-animation-exhibit .exhibit-chapters button>span{width:22px;height:22px}.time-tour-header{display:block}.time-tour-header .exhibit-play{margin-top:22px}#epoch-scene{height:250px}#epoch-scene>div{padding:25px}.epoch-photo-note{font-size:10px;text-align:left;line-height:1.5}.time-presets button{font-size:12px;padding:10px 12px}.diagram-labels{font-size:23px}}
@media(max-width:450px){.exhibit-chapters button{font-size:12px;padding:10px 5px;gap:5px}.exhibit-chapters button>span{font-size:9px;width:21px;height:21px}.exhibit-play{min-height:47px;font-size:14px}.caption-number{font-size:34px}.cycle-process{padding:16px}.cycle-process>h3{font-size:25px}#epoch-scene h2{font-size:2rem}.era-legend button{font-size:13px;padding:13px 10px}.era-legend small{font-size:10px}.topic-hero h1{font-size:2.9rem}.time-toolbar h2{font-size:2.2rem}}
@media(prefers-reduced-motion:reduce){#epoch-scene img,#epoch-scene>div{animation:none}.time-cursor{transition:none}}
/* Mountain formation: a landscape and cutaway exhibit. */
.mountain-building .topic-hero{min-height:260px;background-position:center 46%}
.mountain-building .lesson-section{max-width:1600px;padding-left:3vw;padding-right:3vw;padding-top:36px}
.mountain-building .section-heading{margin-bottom:24px}
.mountain-choices{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-bottom:24px}
.mountain-choices button{position:relative;isolation:isolate;overflow:hidden;text-align:left;min-height:164px;border:1px solid #ffffff27;border-radius:12px;padding:19px;color:#fff;background:#18231d;cursor:pointer;transition:transform .25s,border-color .25s}
.mountain-choices button:after{content:'';position:absolute;inset:0;background:linear-gradient(0deg,#081411f5,transparent 120%);z-index:-1}
.mountain-choices img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2;opacity:.7;transition:transform .4s}
.mountain-choices button:hover img{transform:scale(1.06)}
.mountain-choices button[aria-pressed=true]{border:2px solid var(--mineral);box-shadow:0 0 25px color-mix(in srgb,var(--mineral) 14%,transparent)}
.mountain-choice-number{font:12px monospace;color:var(--mineral)}
.mountain-choice-text{display:block;margin-top:24px}.mountain-choice-text strong{display:block;font-size:25px;font-family:Georgia,serif;font-weight:400}.mountain-choice-text small{display:block;margin-top:5px;color:#ddd9ca}.mountain-choice-arrow{position:absolute;right:19px;bottom:20px;font-size:23px;color:var(--mineral)}
.mountain-building #lesson-diagram{border:1px solid #ffffff24;background:#0c1514;overflow:hidden}
.mountain-theater{display:grid;grid-template-columns:1fr 1.3fr;min-height:500px}
.mountain-observation{position:relative;overflow:hidden;min-height:500px;background:#1b2825}
.mountain-observation>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.mountain-observation:after{content:'';position:absolute;inset:0;background:linear-gradient(0deg,#06120fee,transparent 70%);pointer-events:none}
.mountain-observation-title{position:absolute;bottom:34px;left:30px;right:25px;z-index:1}.mountain-observation-title h3{font:clamp(32px,3.6vw,58px)/1.1 Georgia,serif;margin:13px 0 20px;color:#f4efdf}.mountain-observation-title a{color:#e2e4cd;text-decoration:none;border-bottom:1px solid #e2e4cd80;padding-bottom:5px}
.mountain-photo-tag{position:absolute;top:19px;left:23px;padding:7px 11px;border-radius:20px;color:#f2eee1;background:#0b181ba8;font-size:10px;letter-spacing:1px;text-transform:uppercase}
.mountain-section{display:flex;flex-direction:column;justify-content:space-between;background:radial-gradient(ellipse at center,#253028,#0c1514 75%)}
.mountain-section-heading{padding:25px 28px 0;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between}.mountain-section-heading strong{font:10px monospace;letter-spacing:1.2px;color:var(--mineral)}
.mountain-cutaway{width:100%;flex:1;display:flex;align-items:center}.mountain-building #lesson-diagram svg{display:block;width:100%;height:auto;max-height:none}
.mountain-section-footer{display:flex;justify-content:space-between;padding:0 25px 20px;color:#89968a;font:10px monospace;text-transform:uppercase;letter-spacing:1px}
.mountain-credit{font-size:10px;color:#a7b0a0;padding:9px 20px;background:#0c1514}.mountain-credit .photo-credit{margin:0}.mountain-credit a{color:inherit}
.mountain-building .exhibit-console{border-color:#ffffff24;background:#18221c}.mountain-building .exhibit-play{background:#d6ddb2;color:#142016;border-radius:24px}.mountain-building .exhibit-caption{padding:26px 32px;background:linear-gradient(110deg,#253527,#142019);border:1px solid #ffffff19;border-radius:0 0 14px 14px}.mountain-building .exhibit-caption h3{font:28px Georgia,serif}.mountain-building .lesson-explanation{margin-top:28px}
@media(min-width:1600px){.mountain-building .lesson-section{margin:auto}}
@media(max-width:900px){.mountain-theater{grid-template-columns:1fr}.mountain-observation{min-height:290px}.mountain-section{min-height:370px}.mountain-cutaway svg{max-height:450px!important}.mountain-choices{gap:9px}.mountain-choices button{padding:13px;min-height:145px}.mountain-choice-text strong{font-size:21px}.mountain-choice-text small{font-size:10px}.mountain-choice-arrow{display:none}}
@media(max-width:560px){.mountain-choices{grid-template-columns:1fr 1fr}.mountain-choices button{min-height:127px}.mountain-choice-text{margin-top:15px}.mountain-building .topic-hero{min-height:220px}.mountain-building .lesson-section{padding-left:16px;padding-right:16px}.mountain-observation{min-height:240px}.mountain-section{min-height:280px}.mountain-section-heading{padding:19px 15px 0}.mountain-building .exhibit-caption{padding:22px 16px}.mountain-observation-title{bottom:23px;left:23px}}
@media(prefers-reduced-motion:reduce){.mountain-choices button,.mountain-choices img{transition:none}}