@font-face{font-family:DM;src:url('./assets/dm-sans.ttf') format('truetype');font-display:swap;font-weight:400 700}
@font-face{font-family:Space;src:url('./assets/space-grotesk.ttf') format('truetype');font-display:swap;font-weight:400 700}
:root{--night:#080a10;--panel:#101219;--ink:#f1eee7;--muted:#9497a3;--line:#252831;--ember:#e8a36a;--blue:#afc8e5;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;--display:Space,Arial,sans-serif;--body:DM,Arial,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--night);color:var(--ink);font:15px/1.6 var(--body);overflow-x:hidden}button,input,a{-webkit-tap-highlight-color:transparent}button,a,input{touch-action:manipulation}button{font:inherit;color:inherit;cursor:pointer}button{border:0;background:none}a{color:inherit;text-decoration:none}h1,h2,h3,p{margin:0}h1,h2,h3{font-family:var(--display);font-weight:400;line-height:1.14}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,canvas:focus-visible{outline:2px solid var(--blue);outline-offset:5px}button:hover,a:hover{color:#fff}button:disabled{opacity:.3;cursor:default}[hidden]{display:none!important}::selection{background:#e8a36a44;color:white}.skip{position:fixed;left:20px;top:-60px;z-index:100;background:var(--ember);color:#111;padding:12px 24px;border-radius:6px}.skip:focus{top:12px}
.header{height:90px;margin:0 46px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:14px;font:500 22px/.95 var(--display);letter-spacing:4px}.brand-sub{display:block;font:8px/1 var(--mono);letter-spacing:2px;color:var(--muted);margin-top:9px}.brand-mark{display:inline-block;position:relative;width:30px;height:30px;border:1.5px solid var(--ember);border-radius:50%;flex-shrink:0;transform:rotate(-24deg)}.brand-mark:after{content:'';position:absolute;border:1px solid var(--ink);width:43px;height:10px;border-radius:50%;left:-8px;top:8px}.header nav{display:flex;align-items:center;gap:36px;font-size:12px;color:var(--muted)}.header nav a,.quiet{padding:10px 0}.header nav span{margin-left:9px}.nav-active{color:var(--ink);position:relative}.nav-active:after{content:'';width:4px;height:4px;background:var(--ember);border-radius:50%;position:absolute;left:-12px;top:18px}.quiet{color:var(--muted);font-size:12px}
.observatory{position:relative;min-height:850px;height:calc(100svh - 90px);max-height:1000px}.intro{position:absolute;top:42px;left:46px;z-index:2;pointer-events:none}.eyebrow{font:9px/1.5 var(--mono);letter-spacing:1.6px;color:var(--muted)}.tiny-star{color:var(--ember);font:17px/1 var(--body);vertical-align:-2px;margin-right:8px}.intro h1{font-size:clamp(42px,4.05vw,67px);letter-spacing:-2.7px;line-height:1.04;margin-top:22px}.intro h1 em{font-style:normal;color:var(--ember)}.intro>p:last-child{font-size:13px;line-height:1.7;color:var(--muted);margin-top:20px}
.scene-wrap{position:absolute;top:30px;left:275px;right:210px;bottom:124px;z-index:1;isolation:isolate}.scene-wrap canvas{display:block;width:100%;height:100%;outline-offset:-3px;cursor:grab;touch-action:none;mask-image:linear-gradient(to right,transparent,#000 6%,#000 94%,transparent)}.scene-wrap canvas.dragging{cursor:grabbing}.scene-caption{position:absolute;top:9px;left:50%;transform:translateX(-50%);display:flex;align-items:center;white-space:nowrap;gap:8px;font:7px var(--mono);letter-spacing:1.1px;color:#8d93a0;pointer-events:none}.caption-line{width:25px;height:1px;background:#3e424b;margin:0 3px}.live-dot{height:4px;width:4px;display:inline-block;background:var(--ember);border-radius:50%;box-shadow:0 0 8px #e8a36a88}.view-switch{position:absolute;top:41px;left:50%;transform:translateX(-50%);display:flex;border:1px solid var(--line);padding:3px;border-radius:7px;background:#0b0d13dd;white-space:nowrap}.view-switch button{padding:6px 14px;font-size:10px;color:var(--muted);border-radius:4px}.view-switch button.selected{background:#24242c;color:var(--ink)}.scene-message{position:absolute;top:86px;left:50%;transform:translateX(-50%);max-width:360px;min-width:230px;text-align:center;font-size:11px;color:var(--ember);pointer-events:none}.scene-toolbar{position:absolute;bottom:4px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:12px;white-space:nowrap;font-size:10px;color:var(--muted);background:#0b0d13b8;border:1px solid #252831b0;border-radius:8px;padding:5px 9px;backdrop-filter:blur(10px)}.scene-toolbar b{font-weight:400;margin:0 5px;color:#4e515b}.icon-button{width:27px;height:29px;font-family:var(--mono);font-size:14px;border-radius:3px}.icon-button:hover{background:#252831}.reset-button{font-size:10px;display:flex;align-items:center;gap:6px;padding:5px}.tool-divider{width:1px;height:13px;background:var(--line)}.touch-hint{display:none}.camera-pad{position:absolute;right:0;bottom:58px;display:grid;grid-template-columns:26px 26px 26px;grid-template-rows:26px 26px 26px;gap:3px;color:#8e939e}.camera-pad button{border:1px solid var(--line);border-radius:4px;background:#10121a99;font-size:13px;padding:0}.camera-pad button:hover{border-color:var(--ember);color:var(--ember)}.camera-pad button:first-child{grid-column:2}.camera-pad button:nth-child(2){grid-column:1;grid-row:2}.camera-pad span{grid-column:2;grid-row:2;text-align:center;color:#585c68;font-size:14px}.camera-pad button:nth-child(4){grid-column:3;grid-row:2}.camera-pad button:last-child{grid-column:2;grid-row:3}.part-labels{position:absolute;inset:0;pointer-events:none}.part-label{position:absolute;pointer-events:auto;font:9px var(--mono);letter-spacing:.2px;color:#b4b5bd;display:flex;align-items:center;gap:9px;background:#0b0d15c9;border:1px solid #30313a88;border-radius:4px;padding:8px 10px;white-space:nowrap}.part-label i{height:5px;width:5px;border:1px solid var(--ember);border-radius:50%}.part-label:hover{border-color:var(--ember);color:var(--ink)}.shadow-label{left:48%;top:52%}.ring-label{left:53%;top:33%}.disk-label{left:67%;top:64%}.part-label:before{content:'';height:1px;width:30px;position:absolute;left:-30px;top:50%;background:#8b745b66}.scene-fallback{position:absolute;inset:20%;display:flex;flex-direction:column;justify-content:center;background:var(--panel);padding:30px;border:1px solid var(--line);border-radius:10px}.scene-fallback h2{font-size:24px}.scene-fallback p{margin-top:14px;font-size:13px;color:var(--muted)}
.guide-card{position:absolute;z-index:3;left:46px;top:280px;width:282px;padding:20px 21px 13px;border:1px solid #343137;background:linear-gradient(130deg,#17171ede,#0f1118ed);border-radius:10px;box-shadow:0 14px 45px #0002}.card-eyebrow{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font:8px/1.4 var(--mono);letter-spacing:1.25px}.card-eyebrow>span:last-child{color:var(--ember)}.chapter-dots{display:flex;gap:5px;margin-top:15px}.chapter-dots button{height:3px;flex:1;border-radius:3px;background:#34343e;padding:0}.chapter-dots button.active{background:var(--ember)}.guide-card h2{font-size:24px;letter-spacing:-.8px;margin:20px 0 13px}.guide-card>p{font-size:12px;line-height:1.8;color:#b4b5bf}.lesson-note{font-size:10px;line-height:1.65;color:var(--muted);border-left:1px solid #9b7252;padding-left:11px;margin-top:15px}.experiment-button{width:100%;display:flex;justify-content:space-between;align-items:center;background:var(--ember);color:#1b1512;border-radius:5px;padding:9px 12px;font-size:11px;margin-top:20px}.experiment-button:hover{background:#f7b985;color:#191510}.experiment-button:after{content:'↗';font-size:15px}.lesson-navigation{display:flex;align-items:center;justify-content:space-between;gap:7px;margin-top:14px}.lesson-navigation>span{font:8px var(--mono);color:#8e909c}.small-button{padding:2px 7px;font-size:16px;color:var(--muted)}#lesson-extra{font-size:10px;line-height:1.5;color:var(--muted)}.tides{margin-top:15px;background:#0a0c13;border-radius:5px;padding:15px}.tidal-figure{height:67px;display:flex;align-items:center;gap:20px}.tidal-person{font-size:44px;display:inline-block;transform:scaleY(var(--stretch,1));transition:transform .3s;color:var(--ember)}.tidal-arrows{font:11px/2 var(--mono);color:var(--blue)}
.lab-card{position:absolute;z-index:3;right:46px;top:161px;width:224px;padding:18px;border:1px solid var(--line);border-radius:9px;background:#101219eb;box-shadow:0 12px 45px #0003}.lab-card h2{font-size:18px;letter-spacing:-.4px;margin-top:10px;margin-bottom:23px}.control-row{display:grid;grid-template-columns:1fr auto;margin:18px 0 19px;align-items:center}.control-row label{font-size:10px}.control-row output{font:9px var(--mono);color:var(--ember)}.info-button{font-size:10px;padding:0 0 0 3px;color:#777b88}.control-row input{grid-column:1/-1;margin:10px 0 7px}.range-labels{display:flex;justify-content:space-between;grid-column:1/-1;font-size:8px;color:#808491}.control-footnote{grid-column:1/-1;font-size:8px;color:#858793;line-height:1.5;margin-top:5px}input[type=range]{appearance:none;-webkit-appearance:none;width:100%;height:3px;background:linear-gradient(to right,var(--ember) 0 var(--fill,50%),#34343d var(--fill,50%) 100%);border-radius:3px;cursor:pointer}input[type=range]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:10px;height:10px;border:2px solid #14141b;border-radius:50%;background:#f0ba8e;box-shadow:0 0 0 1px #f0ba8e}input[type=range]::-moz-range-thumb{width:9px;height:9px;border:1px solid #14141b;border-radius:50%;background:#f0ba8e}.preset-row{display:flex;gap:7px;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:13px}.preset-row button{flex:1;font-size:9px;border:1px solid #38343a;border-radius:4px;padding:6px 0;color:#c7c5c7}.preset-row button:hover{background:#24232a}.toggle-row{display:flex;justify-content:space-between;align-items:center;margin:13px 0;font-size:9px;color:#b5b6bf}.toggle-row input{appearance:none;width:26px;height:15px;border-radius:12px;background:#34343e;position:relative;cursor:pointer;margin:0}.toggle-row input:after{content:'';width:9px;height:9px;position:absolute;left:3px;top:3px;border-radius:50%;background:#b9bac2;transition:transform .2s}.toggle-row input:checked{background:#886043}.toggle-row input:checked:after{background:#f9d0ad;transform:translateX(11px)}.lab-tip{display:flex;gap:7px;font-size:8px;line-height:1.6;color:#858995;margin-top:18px}.lab-tip span{color:var(--ember)}
.readouts{position:absolute;bottom:0;left:46px;right:46px;display:grid;grid-template-columns:.85fr 1.12fr 1fr;border-top:1px solid var(--line);height:106px;align-items:center;z-index:3}.readout{display:flex;align-items:center;gap:18px;padding:0 34px;min-width:0}.readout:first-child{padding-left:0}.readout+.readout{border-left:1px solid var(--line)}.readout-icon{font:32px/1 var(--display);color:#767780}.readout>div{display:flex;align-items:baseline;flex-wrap:wrap;column-gap:11px;max-width:100%;text-align:left}.metric-label{display:block;width:100%;font:8px/1.5 var(--mono);letter-spacing:1.2px;color:var(--muted);margin-bottom:8px}.readout strong{font:22px/1.1 var(--display);letter-spacing:-.5px}.readout small{font-size:9px;color:var(--muted);white-space:nowrap;margin-top:5px}.readout:nth-child(2) small{display:block;width:100%;margin-top:6px}.clock-readout{height:65px;padding-right:0}.clock-readout:hover .metric-label{color:var(--ember)}.clock-icon{display:block;position:relative;width:29px;height:29px;border:1px solid #706052;border-radius:50%;flex-shrink:0}.clock-icon:after{content:'';position:absolute;width:3px;height:3px;background:var(--ember);border-radius:50%;left:12px;top:12px}.clock-icon i{display:block;position:absolute;width:1px;height:10px;background:var(--ember);left:13px;top:4px;transform-origin:50% 10px}.clock-readout small span{color:var(--ember);margin-left:5px}
.journey-strip{padding:32px 46px 40px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:55px;background:#0c0e14}.journey-strip>div:first-child{min-width:240px}.journey-strip h2{font-size:22px;letter-spacing:-.7px;margin-top:9px}.chapter-list{display:flex;flex:1;align-items:stretch;justify-content:space-between;gap:10px}.chapter-list button{font-size:10px;color:#8e929f;line-height:1.45;text-align:left;max-width:117px;padding:4px}.chapter-list button span{display:block;font:10px var(--mono);color:#676a76;margin-bottom:8px}.chapter-list button.active{color:var(--ink)}.chapter-list button.active span{color:var(--ember)}.field-notes{padding:90px 70px 72px;max-width:1500px;margin:auto}.section-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:44px}.section-heading h2{font-size:39px;letter-spacing:-1.4px;margin-top:15px}.section-spark{font-size:75px;color:var(--ember);line-height:1}.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}.fact>span{display:block;font-size:28px;color:var(--ember);margin-bottom:25px}.fact h3{font-size:21px;letter-spacing:-.4px;margin-bottom:14px}.fact p{font-size:13px;line-height:1.8;color:var(--muted);max-width:320px}.extras-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:24px;margin-top:65px}.challenge-card,.quiz-card{border:1px solid var(--line);border-radius:12px;padding:30px;background:#11131a}.challenge-card{background:radial-gradient(ellipse at 100% 100%,#3b251c55,transparent 65%),#11131a;overflow:hidden}.challenge-card h3{font-size:34px;margin-top:21px;letter-spacing:-1px}.challenge-card>p{max-width:330px;font-size:13px;color:var(--muted);line-height:1.8;margin-top:16px}.text-button{font-size:12px;color:var(--ember);padding:10px 0}.challenge-card .text-button{margin-top:20px}.text-button span{padding-left:23px}.quiz-card h3{font-size:21px;margin:22px 0}.quiz-card .card-eyebrow{font-size:9px}#quiz-options{display:flex;flex-direction:column;gap:8px}#quiz-options button{font-size:12px;text-align:left;border:1px solid #343640;padding:10px 12px;border-radius:5px;color:#c4c5cd}#quiz-options button span{font:10px var(--mono);display:inline-block;color:var(--muted);margin-right:12px}#quiz-options button:hover{border-color:var(--ember)}#quiz-options button.correct{border-color:#84b29d;background:#19312a66;color:#c1e8d6}#quiz-options button.wrong{border-color:#d4907f;background:#3b242266}#quiz-feedback{font-size:12px;color:var(--muted);line-height:1.7;margin-top:13px}#challenge-progress{font-size:12px;color:var(--ember);margin-top:15px}.glossary{display:grid;grid-template-columns:1fr 1.3fr;gap:90px;margin-top:85px;padding-top:45px;border-top:1px solid var(--line)}.glossary h3{font-size:29px;letter-spacing:-.8px;margin-top:20px}.glossary>div>p:last-child{font-size:12px;color:var(--muted);margin-top:18px}.glossary details{border-bottom:1px solid var(--line);padding:13px 0}.glossary summary{cursor:pointer;list-style:none;font-size:13px;display:flex;justify-content:space-between}.glossary summary:after{content:'+';font-size:16px;color:var(--ember)}.glossary details[open] summary:after{content:'−'}.glossary details p{font-size:12px;color:var(--muted);line-height:1.7;padding:13px 22px 2px 0}footer{margin:0 46px;padding:28px 0;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px}footer .brand{font-size:16px;letter-spacing:3px}footer .brand-mark{width:23px;height:23px}footer .brand-mark:after{width:32px;height:8px;left:-6px;top:6px}footer p{font-size:11px;color:var(--muted)}footer p span{color:var(--ink);margin-left:5px}
dialog{background:#13151e;color:var(--ink);border:1px solid #42414a;border-radius:13px;padding:38px;max-width:610px;width:calc(100% - 32px);max-height:85svh;box-shadow:0 25px 120px #0009}dialog::backdrop{background:#030409b8;backdrop-filter:blur(8px)}.dialog-close{position:absolute;right:14px;top:8px;color:var(--muted);font-size:26px;width:38px;height:38px}.dialog-eyebrow{font:9px var(--mono);color:var(--ember);letter-spacing:1.6px;margin-bottom:16px}dialog h2{font-size:33px;letter-spacing:-1px;max-width:95%;margin-bottom:20px}dialog h3{font-size:17px;margin:25px 0 9px}dialog p,dialog li{font-size:13px;line-height:1.85;color:#b9bdc8}dialog p+p{margin-top:13px}dialog a{color:var(--ember);text-decoration:underline;text-underline-offset:4px}dialog ul{padding-left:18px}dialog .dialog-tip{margin-top:22px;border-left:2px solid var(--ember);padding-left:15px;color:var(--blue)}.key-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px;font-size:12px;color:var(--muted)}kbd{font:11px var(--mono);border:1px solid #484752;border-radius:4px;padding:4px 7px;color:var(--ink);display:inline-block;background:#222530;min-width:25px;text-align:center}.clocks{display:grid;grid-template-columns:1fr 1fr;gap:16px;text-align:center;margin:28px 0 25px}.clock-face{margin:0 auto 15px;width:92px;height:92px;border:1px solid #746451;border-radius:50%;position:relative;background:repeating-conic-gradient(from 0deg,#535665 0 1deg,transparent 1deg 30deg);box-shadow:inset 0 0 0 8px #13151e}.clock-face:before{content:'';position:absolute;inset:12px;background:#13151e;border-radius:50%}.clock-face:after{content:'';position:absolute;width:5px;height:5px;border-radius:50%;background:var(--ember);top:43px;left:43px}.clock-face i{position:absolute;width:2px;height:35px;left:44px;top:10px;background:var(--ember);transform-origin:50% 35px}.clock-block span{font:10px var(--mono);color:var(--muted)}.clock-block strong{display:block;font:22px var(--display);margin-top:8px}.clock-slider{margin:24px 0 18px}.clock-slider label{display:flex;justify-content:space-between;font-size:12px}.clock-slider input{margin-top:22px}.clock-equation{font:12px var(--mono);color:var(--ember);padding:18px;background:#0b0d15;border-radius:5px;margin-top:20px}.horizon-diagram{display:flex;justify-content:center;align-items:center;margin:25px 0;width:100%;height:200px}.shadow-disc{border:1px solid #e8a36a;background:#020307;width:190px;height:190px;border-radius:50%;position:relative;display:flex;align-items:center;justify-content:center}.horizon-disc{width:73px;height:73px;border:1px dashed #7896ba;border-radius:50%;font-size:10px;text-align:center;display:flex;align-items:center;justify-content:center;color:var(--blue)}.shadow-disc>span{position:absolute;bottom:15px;font:9px var(--mono);color:var(--ember)}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;transition:transform .25s,opacity .25s;z-index:20;font-size:12px;background:#26232a;border:1px solid #665243;border-radius:8px;box-shadow:0 10px 40px #0006;padding:11px 20px;max-width:calc(100% - 32px);width:max-content;text-align:center}.toast.visible{opacity:1;transform:translate(-50%,0)}
@media(min-width:1650px){.intro,.guide-card{left:70px}.header{margin:0 70px}.lab-card{right:70px;width:244px;padding:23px}.readouts{left:70px;right:70px}.guide-card{width:302px}.guide-card h2{font-size:27px}.guide-card>p{font-size:13px}.scene-wrap{left:305px;right:240px}}
@media(max-width:1200px) and (min-width:851px){.header{margin:0 30px}.observatory{min-height:850px}.intro,.guide-card{left:30px}.intro h1{font-size:47px}.guide-card{width:250px;padding:17px}.guide-card h2{font-size:22px}.lab-card{right:28px;width:199px;padding:15px}.scene-wrap{left:224px;right:165px}.scene-caption{font-size:6px}.scene-caption .caption-line{display:none}.readouts{left:30px;right:30px}.readout{padding:0 20px;gap:13px}.readout strong{font-size:20px}.readout small{font-size:8px}.journey-strip{padding:30px;gap:27px}.journey-strip>div:first-child{min-width:190px}.journey-strip h2{font-size:20px}.chapter-list{gap:5px}.chapter-list button{font-size:9px}.camera-pad{right:0}.scene-toolbar{gap:7px}.field-notes{padding:70px 40px}}
@media(max-width:850px){.header{height:76px;margin:0 24px}.brand{font-size:18px;letter-spacing:3px}.brand-sub{font-size:6px;letter-spacing:1.5px}.header nav{gap:20px;font-size:11px}.header nav>a:first-child{display:none}.header .quiet{font-size:11px}.observatory{height:auto;max-height:none;min-height:0;display:flex;flex-direction:column;padding-bottom:0}.intro{position:relative;top:auto;left:auto;padding:34px 26px 0;order:0}.intro h1{font-size:48px;letter-spacing:-2px;line-height:1.04;margin-top:17px}.intro h1 br{display:none}.intro h1 em{display:block}.intro>p:last-child{margin-top:15px;font-size:12px}.intro>p:last-child br{display:none}.scene-wrap{position:relative;inset:auto;width:100%;height:490px;order:1;margin-top:20px}.scene-caption{top:12px;font-size:6px}.view-switch{top:38px}.scene-toolbar{bottom:7px}.camera-pad{right:20px;bottom:64px;grid-template-columns:32px 32px 32px;grid-template-rows:32px 32px 32px}.scene-message{top:78px}.guide-card{position:relative;left:auto;top:auto;width:calc(100% - 48px);margin:26px 24px 0;order:2;padding:25px}.guide-card h2{font-size:27px}.guide-card>p{font-size:14px;line-height:1.8}.lesson-note{font-size:12px;line-height:1.75;margin-top:17px}.card-eyebrow{font-size:9px}.experiment-button{font-size:13px;padding:12px 15px;margin-top:22px}.lesson-navigation{margin-top:18px}.lesson-navigation>span{font-size:10px}.small-button{width:40px;height:35px}.chapter-dots{margin-top:20px;gap:7px}.chapter-dots button{height:4px}.lab-card{position:relative;top:auto;right:auto;width:calc(100% - 48px);margin:22px 24px 0;order:4;padding:25px;display:grid;grid-template-columns:1fr 1fr;column-gap:30px}.lab-card>.card-eyebrow,.lab-card h2,.lab-tip{grid-column:1/-1}.lab-card h2{font-size:22px;margin-bottom:8px}.control-row{margin:18px 0}.control-row label{font-size:12px}.control-row output{font-size:11px}.range-labels{font-size:9px}.control-footnote{font-size:10px}.control-row input{margin-top:20px;margin-bottom:13px}input[type=range]{height:4px}input[type=range]::-webkit-slider-thumb{width:16px;height:16px}.preset-row{grid-column:2;grid-row:4;border:0;padding:0;align-self:center}.preset-row button{font-size:11px;height:40px}.toggle-row{font-size:12px}.toggle-row input{width:34px;height:20px}.toggle-row input:after{width:14px;height:14px}.toggle-row input:checked:after{transform:translateX(14px)}.lab-tip{font-size:10px;margin-top:10px}.readouts{position:relative;inset:auto;order:3;margin:22px 24px 0;height:auto;grid-template-columns:1fr 1fr;row-gap:20px;padding:23px 0;border-bottom:1px solid var(--line)}.readout{padding:0 18px;gap:10px}.readout:first-child{padding-left:0}.readout strong{font-size:22px}.readout small{font-size:9px;white-space:normal}.metric-label{font-size:8px}.readout-icon{font-size:26px}.clock-readout{grid-column:1/-1;border-left:0!important;border-top:1px solid var(--line);padding:23px 0 0;height:auto}.clock-readout>div{column-gap:15px}.clock-readout .metric-label{width:auto;margin:0 7px 0 0}.clock-readout small{margin:0}.journey-strip{flex-direction:column;gap:23px;padding:38px 24px;margin-top:30px;align-items:stretch}.journey-strip h2{font-size:26px}.chapter-list{display:grid;grid-template-columns:repeat(3,1fr);gap:20px 15px}.chapter-list button{font-size:12px;max-width:150px}.chapter-list button span{font-size:11px;margin-bottom:6px}.field-notes{padding:57px 24px 40px}.section-heading h2{font-size:31px;max-width:350px;letter-spacing:-1px}.section-spark{font-size:50px}.facts{gap:24px}.fact h3{font-size:19px}.fact p{font-size:12px}.extras-grid{margin-top:45px;grid-template-columns:1fr;gap:20px}.challenge-card,.quiz-card{padding:27px}.challenge-card h3{font-size:33px}.challenge-card>p{max-width:none}.glossary{grid-template-columns:1fr;gap:30px;margin-top:55px;padding-top:35px}.glossary h3{font-size:28px}.glossary h3 br{display:none}.glossary summary{font-size:14px;padding:2px 0}.glossary details p{font-size:13px}footer{margin:0 24px;flex-wrap:wrap;padding:25px 0;gap:20px}footer p{font-size:10px;order:3;width:100%}.part-label{font-size:9px;padding:7px 8px}.ring-label{left:57%;top:36%}.disk-label{left:66%;top:62%}.shadow-label{left:48%;top:51%}.scene-wrap canvas{mask-image:linear-gradient(transparent,#000 7%,#000 94%,transparent)}.desktop-hint{display:none}.touch-hint{display:inline}dialog{padding:30px 25px}dialog h2{font-size:28px}}
@media(max-width:520px){.header{margin:0 20px;height:70px}.brand{font-size:17px;gap:12px}.brand-mark{width:24px;height:24px}.brand-mark:after{width:34px;height:9px;left:-6px;top:6px}.header nav{gap:15px}.header nav>a{display:none}.header nav span{display:none}.header .quiet{font-size:10px}.intro{padding:30px 22px 0}.intro h1{font-size:45px}.intro .eyebrow{font-size:8px}.intro>p:last-child{max-width:300px;font-size:12px}.scene-wrap{height:390px;margin-top:18px}.scene-caption{font-size:5.5px;gap:6px}.caption-line{width:10px}.view-switch{top:36px}.view-switch button{font-size:10px;padding:7px 11px}.camera-pad{right:14px;bottom:62px;grid-template-columns:30px 30px 30px;grid-template-rows:30px 30px 30px}.scene-toolbar{gap:5px;font-size:9px;padding:5px 7px;width:calc(100% - 32px);justify-content:center}.scene-toolbar b{margin:0 3px}.icon-button{width:28px;height:32px}.reset-button{font-size:9px}.tool-divider{margin:0 3px}.scene-toolbar .reset-button span{display:none}.part-label{font-size:8px;padding:6px;gap:5px}.part-label:before{width:17px;left:-17px}.ring-label{left:56%;top:36%}.disk-label{left:63%;top:60%}.shadow-label{left:44%;top:50%}.guide-card{margin:20px 18px 0;width:calc(100% - 36px);padding:23px}.guide-card h2{font-size:27px}.guide-card>p{font-size:13px}.lesson-note{font-size:11px}.readouts{margin:24px 22px 0;gap:22px 0;grid-template-columns:.82fr 1.18fr}.readout{padding:0 0 0 17px;gap:11px;align-items:flex-start}.readout-icon{display:none}.readout strong{font-size:20px}.readout small{font-size:9px}.readout>div{gap:4px}.metric-label{font-size:7px;letter-spacing:.7px;margin-bottom:5px}.clock-readout{padding:20px 0 0;align-items:center}.clock-readout .metric-label{width:100%;font-size:8px;margin:0}.clock-readout>div{column-gap:12px;row-gap:7px}.clock-readout strong{font-size:22px}.lab-card{margin:23px 18px 0;width:calc(100% - 36px);padding:23px;display:block}.lab-card h2{font-size:24px}.control-row{margin:26px 0}.control-row label{font-size:13px}.control-row output{font-size:12px}.control-row input{margin-top:24px}.range-labels{font-size:10px}.preset-row{margin-top:30px;border-bottom:1px solid var(--line);padding-bottom:19px}.preset-row button{font-size:12px}.toggle-row{font-size:12px;min-height:35px;margin:13px 0}.lab-tip{font-size:10px}.facts{grid-template-columns:1fr;gap:30px}.fact{display:grid;grid-template-columns:35px 1fr;column-gap:15px;align-items:start}.fact>span{margin:0;font-size:24px;grid-row:1/3}.fact h3{font-size:21px;margin-bottom:10px}.fact p{font-size:13px;max-width:none}.section-heading{gap:15px;margin-bottom:36px}.section-heading h2{font-size:29px;max-width:250px}.section-spark{font-size:40px}.section-heading .eyebrow{font-size:7px}.quiz-card h3{font-size:23px}#quiz-options button{padding:12px;font-size:12px}.quiz-card .card-eyebrow{font-size:8px}.key-grid{grid-template-columns:1fr}.clocks{gap:10px}.clock-block strong{font-size:20px}.clock-slider label{font-size:11px}.glossary h3{font-size:26px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}.live-dot{box-shadow:none}}

.part-label[data-side=left]:before{left:auto;right:-25px;width:25px}dialog .tidal-figure{height:130px;justify-content:center;gap:45px}dialog .tidal-person{font-size:60px}dialog .tidal-arrows{font-size:14px}dialog .tides label{font-size:13px;display:block;margin:20px 0}dialog .tides input{margin-bottom:25px}
@media(max-width:850px){.camera-pad{display:flex;left:50%;right:auto;transform:translateX(-50%);bottom:57px;gap:8px}.camera-pad button{width:44px;height:42px;font-size:17px}.camera-pad span{display:none}.camera-pad button:first-child{order:1}.camera-pad button:nth-child(2){order:0}.camera-pad button:nth-child(4){order:2}.camera-pad button:last-child{order:3}.view-switch button{min-height:38px}.control-row input{height:36px;background-size:100% 4px;background-repeat:no-repeat;background-position:center;margin-top:8px;margin-bottom:2px}.part-label{min-height:29px}.scene-toolbar .reset-button{min-width:35px;min-height:35px}.scene-toolbar .icon-button{min-height:35px}}
.annotation-lines{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.annotation-lines path{stroke:#8b745b99;stroke-width:1;fill:none}.disk-label:before{display:none}