@font-face{font-family:Hanken;src:url('assets/hanken-regular.ttf') format('truetype');font-weight:400;font-display:swap}@font-face{font-family:Hanken;src:url('assets/hanken-semibold.ttf') format('truetype');font-weight:600;font-display:swap}
:root{--bg:#080e13;--ink:#e5f1f2;--muted:#a2b6bf;--rule:#2b414b;--accent:#7cebd7;--paper:#111e27;--blue:#7cebd7;--warm:#ffc18c;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth;scrollbar-color:#4a6877 var(--bg)}body{margin:0;background:var(--bg);color:var(--ink);font:400 15px/1.5 Hanken,sans-serif}::selection{background:#7cebd7;color:#080e13}button,input,a{font:inherit;outline-offset:5px}button:focus-visible,input:focus-visible,a:focus-visible,summary:focus-visible,#viewport:focus-visible{outline:2px solid var(--accent)}a{color:inherit;text-underline-offset:4px}button{color:inherit;cursor:pointer;border:0;background:none;padding:0}button:hover{color:var(--accent)}button:disabled{cursor:not-allowed;opacity:.55}button svg,header svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.svg-defs{position:absolute;width:0;height:0;overflow:hidden}[hidden]{display:none!important}header{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 36px;border-bottom:1px solid var(--rule)}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:23px;letter-spacing:-.03em}.brand svg{width:29px;height:24px;stroke-width:1.7}.brand b{font-weight:400;color:var(--muted)}.header-title{font-size:13px;margin:0}.header-title span{color:var(--muted)}header button{display:flex;gap:18px;align-items:center;font-size:13px;min-height:44px}.scene-area{position:relative;height:calc(100svh - 314px);min-height:490px;max-height:900px;overflow:hidden}#viewport{position:absolute;inset:0;cursor:grab;touch-action:pan-y}#viewport:active{cursor:grabbing}#viewport canvas{display:block;width:100%;height:100%}.intro{position:absolute;top:45px;left:36px;width:270px;pointer-events:none}h1{font-size:clamp(38px,4.25vw,64px);font-weight:400;line-height:1.02;letter-spacing:-.04em;margin:0 0 22px;text-wrap:balance}.intro p{max-width:225px;font-size:14px;color:var(--muted);line-height:1.6;margin:0}.next-link{display:flex;gap:14px;align-items:center;pointer-events:auto;font-size:12px;margin-top:24px;min-height:44px;border-bottom:1px solid var(--rule);text-align:left}.next-link svg{width:16px;height:16px}.mode-switch{position:absolute;left:36px;bottom:52px;display:flex;flex-direction:column;gap:2px}.mode-switch button{font-size:14px;min-height:40px;text-align:left;display:flex;align-items:center;gap:12px;color:var(--muted)}.mode-switch button:before{content:'';width:5px;height:5px;border-radius:50%;background:transparent}.mode-switch button[aria-selected=true]{color:var(--ink);font-weight:600}.mode-switch button[aria-selected=true]:before{background:var(--accent)}.tools{position:absolute;right:36px;top:48px;width:155px}.tool-heading{font-size:12px;margin-bottom:7px;color:var(--muted)}.camera-presets{display:flex;gap:17px}.camera-presets button{font-size:12px;min-height:35px;border-bottom:1px solid transparent}.camera-presets button[aria-pressed=true]{border-color:var(--ink)}.zoom-row{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--rule);padding:8px 0 9px;font-size:12px;color:var(--muted)}.zoom-row button{width:35px;height:36px;display:grid;place-items:center}.layer-list{padding-top:16px;display:flex;flex-direction:column;gap:12px}.layer-list label{font-size:12px;display:flex;gap:9px;align-items:center;cursor:pointer;min-height:24px}.layer-list input{appearance:none;width:12px;height:12px;border:1px solid #809ca9;margin:0;display:grid;place-items:center}.layer-list input:checked{background:var(--ink);border-color:var(--ink)}.layer-list input:checked:after{content:'';width:5px;height:3px;border-left:1px solid #080e13;border-bottom:1px solid #080e13;transform:rotate(-45deg);margin-top:-2px}.reset-view{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:12px;min-height:44px;margin-top:13px}.reset-view svg{width:14px}.pins{position:absolute;inset:0;pointer-events:none}.pin{position:absolute;pointer-events:auto;display:flex;align-items:center;gap:8px;font-size:12px;min-height:36px;color:var(--ink);white-space:nowrap;text-shadow:0 1px 2px var(--bg)}.pin span{width:7px;height:7px;border:1px solid var(--accent);background:var(--bg);border-radius:50%}.pin:hover span,.pin[aria-pressed=true] span{background:var(--accent)}.inspection{position:absolute;bottom:58px;right:36px;width:255px;background:var(--paper);padding:20px 23px;border-radius:12px;box-shadow:0 16px 40px #0008}.inspection h2{font-size:17px;font-weight:600;margin:0 20px 7px 0}.inspection p{font-size:12px;line-height:1.7;margin:0;color:var(--muted)}.inspection>button{position:absolute;right:10px;top:9px;padding:5px}.inspection svg{width:15px;height:15px}.scene-caption{position:absolute;bottom:15px;left:36px;right:36px;display:flex;justify-content:space-between;font-size:12px;color:var(--muted);pointer-events:none}.ghost-key{position:absolute;bottom:58px;left:50%;font-size:12px;color:var(--muted);display:flex;align-items:center;gap:8px}.ghost-key span{width:16px;border-top:1px dashed #a2b6bf}.transport{display:flex;gap:35px;padding:22px 36px 18px;border-top:1px solid var(--rule);align-items:center;background:#0e1921}.play-group{display:flex;gap:14px;align-items:center}.play-group #play{width:86px;min-height:48px;background:var(--accent);color:#080e13;display:flex;justify-content:center;align-items:center;gap:10px;border-radius:3px;font-size:13px}.play-group #play:hover{background:#aff7e9}.play-group #play svg{width:15px;height:15px}.play-group #reset{width:30px;height:44px;display:grid;place-items:center}.scrubber{flex:1;min-width:0}.timeline-top{display:flex;justify-content:space-between;align-items:center;font-size:12px}.timeline-top output{font-variant-numeric:tabular-nums;margin-left:12px;font-size:14px}.timeline-top>span{font-size:12px;color:var(--muted)}input[type=range]{appearance:none;width:100%;height:2px;background:#506774;accent-color:var(--ink);cursor:pointer;margin:15px 0 10px;display:block}input[type=range]::-webkit-slider-thumb{appearance:none;width:12px;height:12px;background:var(--ink);border:2px solid #0e1921;border-radius:50%;box-shadow:0 0 0 1px var(--ink)}input[type=range]::-moz-range-thumb{width:9px;height:9px;background:var(--ink);border:2px solid #0e1921;border-radius:50%}input[type=range]:disabled{cursor:not-allowed;opacity:.45}.time-ticks{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}.viscosity-control{width:180px;border-left:1px solid var(--rule);padding-left:28px}.viscosity-control label{display:flex;justify-content:space-between;font-size:12px}.viscosity-control output{font-variant-numeric:tabular-nums}.viscosity-control small{display:block;font-size:12px;line-height:1.4;color:var(--muted)}#share{display:flex;gap:8px;align-items:center;min-height:44px;font-size:12px;white-space:nowrap}#share svg{width:16px}.measurements{display:grid;grid-template-columns:repeat(3,160px) 1fr;gap:35px;padding:23px 36px 15px;border-top:1px solid var(--rule);align-items:center}.measurement>span{font-size:12px;color:var(--muted)}.measurement strong{display:block;font-size:29px;line-height:1.3;font-weight:400;letter-spacing:-.03em;font-variant-numeric:tabular-nums}.measurement small{font-size:15px;color:var(--muted);font-weight:400}.observation{max-width:540px;justify-self:end;font-size:13px;line-height:1.6;color:var(--muted);margin:0}.disclosure-line{padding:0 36px 14px;display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:12px;color:var(--muted)}.disclosure-line p{margin:0}.disclosure-line button{display:flex;align-items:center;gap:8px;min-height:32px;font-size:12px;white-space:nowrap}.disclosure-line svg{width:12px;height:12px}#quick-explain{padding:12px 36px 24px;display:grid;grid-template-columns:1fr 1fr;gap:40px;font-size:13px;color:var(--muted);border-top:1px solid var(--rule)}#quick-explain p{max-width:65ch}.chart-panel{border-top:1px solid var(--rule);padding:35px 36px;display:grid;grid-template-columns:1fr 2fr;gap:60px}.chart-panel h2{font-weight:400;line-height:1.1;letter-spacing:-.03em;font-size:32px;margin:0 0 18px}.chart-panel p{font-size:13px;color:var(--muted);max-width:330px}.chart-wrap svg{width:100%;height:auto;cursor:crosshair;touch-action:pan-y}.chart-wrap>p{font-size:12px;max-width:none}.chart-legend{display:flex;gap:22px;font-size:12px}.chart-legend span{display:flex;gap:6px;align-items:center}.chart-legend i{width:12px;height:2px;background:var(--accent)}.chart-legend span+span i{background:var(--blue)}footer{padding:20px 36px;border-top:1px solid var(--rule);display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}#webgl-fallback{position:absolute;left:35%;top:30%;width:35%;padding:25px;background:var(--paper);border:1px solid var(--rule)}#webgl-fallback h2{font-weight:400}#webgl-fallback p{font-size:13px}#webgl-fallback button{text-decoration:underline;font-size:12px}
#notes{background:var(--paper);padding:45px 36px}.notes-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:35px}.notes-heading h2{font-size:38px;letter-spacing:-.03em;font-weight:400;margin:0}.notes-heading button{display:flex;align-items:center;gap:10px;font-size:12px}.micro,.story-icon,.section-heading>.micro{display:none}.understand .section-heading{display:grid;grid-template-columns:1fr 1fr;gap:50px}.section-heading h2,.equation-section h2,.source h2{font-size:28px;line-height:1.2;font-weight:400;letter-spacing:-.02em;margin:0}.section-heading p,.story-grid p,.equation-section p,.source p{font-size:13px;line-height:1.8;color:var(--muted);max-width:65ch}.story-grid{margin:25px 0 40px}.story-grid article{display:grid;grid-template-columns:1fr 2fr;gap:50px;padding:14px 0;border-top:1px solid var(--rule)}.story-grid h3{font-weight:400;font-size:19px;margin:10px 0}.story-grid p{margin:10px 0}.equation-section{display:grid;grid-template-columns:1fr 2fr;gap:50px;border-top:1px solid var(--rule);padding:35px 0}.equation{display:flex;gap:15px;align-items:center;flex-wrap:wrap}.equation button{font-family:Georgia,serif;font-size:22px;padding:10px 12px;border-bottom:1px solid var(--rule)}.equation button.selected{color:var(--accent);border-color:var(--accent)}#term-copy{font-size:13px;line-height:1.7;margin-top:20px;color:var(--muted)}#term-copy strong{display:block;color:var(--ink)}.incompressible{font-size:12px!important}.source{display:grid;grid-template-columns:1fr 1fr;gap:70px;border-top:1px solid var(--rule);padding-top:40px}.source h2{margin-bottom:20px}.source-link{display:flex;justify-content:space-between;font-size:12px;padding:12px 0;border-bottom:1px solid var(--rule);text-decoration:none}.blender-preview{margin:25px 0 0;max-width:380px}.blender-preview img{width:100%;display:block}.blender-preview figcaption{font-size:12px;color:var(--muted);margin-top:10px}.blender-preview a{display:inline-block;margin:7px 14px 0 0}details{border-top:1px solid var(--rule);padding:15px 0}summary{font-size:13px;cursor:pointer}.source details p{font-size:12px}.brand-mark{display:none}
@media(min-width:1700px){.intro{left:4vw}.tools{right:4vw}.intro p{font-size:16px}}
@media(max-width:1100px){.intro{width:215px}.intro p{font-size:13px;max-width:185px}h1{font-size:43px}.tools{width:145px;right:24px}.scene-area{min-height:520px}.measurements{grid-template-columns:repeat(3,120px) 1fr;gap:22px}.transport{gap:22px}#share span{display:none}.viscosity-control{width:155px;padding-left:20px}.inspection{width:220px;right:24px}.header-title{font-size:12px}}
@media(max-width:700px){header{height:65px;padding:0 20px}.brand{font-size:21px}.brand svg{width:24px}.header-title{display:none}header button{font-size:12px;gap:9px}.scene-area{height:650px;min-height:0;max-height:none}.intro{left:20px;top:23px;width:calc(100% - 40px);display:grid;grid-template-columns:1fr 1fr;gap:10px;align-items:start}.intro h1{font-size:36px;letter-spacing:-.035em;margin:0}.intro p{font-size:12px;max-width:170px;margin-top:2px}.next-link{display:none}#viewport{top:80px;bottom:125px}.tools{left:20px;right:20px;top:auto;bottom:37px;width:auto;display:flex;align-items:center;flex-wrap:wrap;gap:10px 20px}.tool-heading,.reset-view{display:none}.camera-presets{gap:18px}.camera-presets button{min-height:40px}.zoom-row{padding:0;border:0;gap:5px}.zoom-row span{display:none}.zoom-row button{width:32px;height:40px}.layer-list{padding:0;flex-direction:row;gap:16px;width:100%}.layer-list label{font-size:12px;min-height:32px;gap:6px}.mode-switch{bottom:142px;left:20px;right:20px;flex-direction:row;gap:24px;justify-content:center}.mode-switch button{font-size:12px;gap:6px}.scene-caption{bottom:10px;left:20px;right:20px;font-size:12px}.scene-caption span:last-child{max-width:120px;text-align:right}.pin{font-size:12px}.inspection{bottom:190px;right:20px;left:20px;width:auto;padding:17px 20px}.inspection p{font-size:12px}.ghost-key{bottom:192px;left:20px;font-size:12px}.transport{padding:17px 20px;gap:14px;flex-wrap:wrap}.play-group{gap:7px}.play-group #play{width:45px;min-height:44px}.play-group #play span{display:none}.play-group #reset{width:27px}.scrubber{width:calc(100% - 86px);flex:auto}.viscosity-control{width:calc(100% - 60px);border:0;padding:10px 0 0;margin-top:6px}.viscosity-control input{margin:12px 0 10px}.viscosity-control small{font-size:12px}.viscosity-control label{font-size:12px}#share{margin-left:auto;padding-top:15px;width:35px;justify-content:center}.measurements{padding:20px;grid-template-columns:repeat(3,1fr);gap:20px}.measurement strong{font-size:28px}.measurement>span{font-size:12px}.observation{grid-column:1/-1;justify-self:start;font-size:12px;max-width:none;border-top:1px solid var(--rule);padding-top:15px}.disclosure-line{padding:0 20px 12px;align-items:start;font-size:12px;gap:12px}.disclosure-line p{max-width:200px;padding-top:7px}.disclosure-line button{font-size:12px}#quick-explain{padding:10px 20px 20px;grid-template-columns:1fr;gap:0;font-size:12px}.chart-panel{grid-template-columns:1fr;gap:20px;padding:25px 20px}.chart-panel h2{font-size:30px}.chart-panel p{max-width:none}.chart-wrap>p{font-size:12px}.chart-wrap svg{min-height:170px}.notes-heading h2{font-size:29px}#notes{padding:30px 20px}.notes-heading button{font-size:12px}.understand .section-heading,.story-grid article,.equation-section,.source{grid-template-columns:1fr;gap:12px}.story-grid article{padding:15px 0}.story-grid h3{margin:0}.story-grid p{margin:0}.section-heading h2,.equation-section h2,.source h2{font-size:26px}.source{gap:30px}.equation{gap:5px}.equation button{font-size:19px;padding:10px 5px}.blender-preview{max-width:100%}footer{padding:18px 20px;gap:10px;flex-wrap:wrap;font-size:12px}footer span:last-child{width:100%}#webgl-fallback{left:20px;right:20px;top:155px;width:auto}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

@media(max-width:700px){.scrubber{width:auto;flex:1;min-width:0}.scene-caption{font-size:12px;gap:20px}.scene-caption span:last-child{max-width:155px}.layer-list{gap:12px}.layer-list label{font-size:12px}.tools{bottom:50px}.mode-switch{bottom:154px}.scene-area{height:675px}#viewport{bottom:150px}.disclosure-line{flex-wrap:wrap}.disclosure-line p{max-width:none}.viscosity-control small{min-height:30px}.time-ticks{font-size:12px}}

/* Dark observation instrument: light is reserved for the moving geometry and actions. */
body{caret-color:var(--accent)}header{background:#0b141b}.brand b{color:var(--ink);font-weight:600}.brand svg{color:var(--accent)}.scene-area{background:radial-gradient(ellipse at 52% 48%,#122b33 0%,#0b1820 38%,#080e13 74%)}.intro h1{font-weight:600;font-size:clamp(38px,4.2vw,62px)}.intro p{color:#b3c6cc}.guide-launch{pointer-events:auto;display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--accent);color:#081511;padding:12px 16px;margin-top:24px;border-radius:5px;min-height:46px;font-size:13px;font-weight:600}.guide-launch:hover{background:#aff7e9;color:#081511}.next-link{margin-top:12px;color:var(--muted)}.mode-switch{gap:4px}.mode-switch button{padding:0 13px;border:1px solid transparent;border-radius:5px}.mode-switch button[aria-selected=true]{background:#132c32;border-color:#38665f;color:var(--accent)}.camera-presets button[aria-pressed=true]{color:var(--accent);border-color:var(--accent)}.pin{color:#d8eded;text-shadow:0 2px 5px #000}.pin span{border-color:var(--warm)}.pin:hover span,.pin[aria-pressed=true] span{background:var(--warm)}.measurement strong{color:var(--ink)}#speed{color:var(--warm)}#energy{color:var(--accent)}.chart-legend i{background:var(--warm)}.chart-legend span+span i{background:var(--accent)}.live-insight{display:flex;gap:30px;align-items:center;justify-content:space-between;padding:4px 36px 22px}.live-insight p{margin:0;max-width:76ch;font-size:14px;color:var(--muted)}.live-insight strong{color:var(--ink);font-weight:600}.live-insight button{display:flex;align-items:center;gap:10px;white-space:nowrap;min-height:44px;font-size:12px;color:var(--accent)}.learning{background:var(--paper);padding:28px 36px 32px;border-top:1px solid var(--rule);scroll-margin-top:16px}.lesson-heading{display:flex;justify-content:space-between;gap:20px;align-items:start}.lesson-heading h2{font-size:28px;font-weight:600;letter-spacing:-.025em;margin:0}.lesson-heading p{font-size:12px;color:var(--muted);margin:8px 0 0}.lesson-heading>button{width:44px;height:44px;display:grid;place-items:center}.lesson-body{display:grid;grid-template-columns:1.4fr 1fr;gap:64px;margin-top:20px}.lesson-body p{font-size:14px;line-height:1.65;max-width:70ch;margin:0 0 16px}.lesson-choices{display:flex;gap:10px;flex-wrap:wrap}.lesson-choices button{border:1px solid #54727d;border-radius:5px;padding:11px 15px;min-height:44px;font-size:13px}.lesson-choices button:hover,.lesson-choices button[aria-pressed=true]{border-color:var(--accent);background:#1c393b;color:var(--accent)}.lesson-result{font-size:14px;line-height:1.7;margin-top:18px;color:var(--muted);max-width:70ch}.lesson-result strong{color:var(--ink);display:block}.lesson-actions{display:flex;gap:24px;flex-wrap:wrap;margin-top:14px}.lesson-actions button{font-size:13px;min-height:44px;display:flex;align-items:center;gap:12px;color:var(--accent)}.lesson-visual{border-left:1px solid var(--rule);padding-left:34px}.lesson-visual h3{margin:0 0 20px;font-size:16px;font-weight:600}.compare-row{display:grid;grid-template-columns:105px 1fr 50px;align-items:center;gap:14px;margin-bottom:18px;font-size:12px}.compare-track{height:8px;background:#293d47;border-radius:2px;overflow:hidden}.compare-track span{height:100%;display:block;background:var(--accent);transition:width .55s cubic-bezier(.16,1,.3,1)}.compare-row.warm .compare-track span{background:var(--warm)}.compare-row output{font-variant-numeric:tabular-nums;text-align:right}#lesson-visual-note{font-size:12px;color:var(--muted);margin:18px 0 0}.energy-equation{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:10px 0}.energy-equation div{display:grid;gap:6px}.energy-equation strong{font-size:24px;font-weight:400;font-variant-numeric:tabular-nums}.energy-equation small{font-size:12px;color:var(--muted)}.energy-equation .result{color:var(--accent)}
@media(max-width:1100px){.intro{width:235px}.lesson-body{gap:30px}.live-insight{gap:18px}}
@media(max-width:700px){.scene-area{height:735px}.intro{width:calc(100% - 40px);grid-template-columns:1fr 1fr;gap:12px}.intro h1{font-size:36px}.guide-launch{grid-column:1/-1;justify-self:start;margin-top:0;padding:10px 14px;min-height:44px;font-size:12px}#viewport{top:150px;bottom:165px}.mode-switch{gap:8px;left:14px;right:14px}.mode-switch button{padding:0 9px;font-size:12px;gap:5px}.live-insight{padding:0 20px 20px;display:block}.live-insight p{font-size:13px}.live-insight button{margin-top:6px}.learning{padding:22px 20px}.lesson-heading h2{font-size:25px}.lesson-body{grid-template-columns:1fr;gap:24px}.lesson-visual{border-left:0;border-top:1px solid var(--rule);padding:22px 0 0}.lesson-choices{gap:8px}.lesson-choices button{font-size:12px;padding:10px 12px}.lesson-heading p{font-size:12px}.lesson-actions{gap:16px}.compare-row{grid-template-columns:100px 1fr 48px}.scene-caption{font-size:12px}.header-title{display:none}}
@media(prefers-reduced-motion:reduce){.compare-track span{transition:none}}

@media(max-width:700px){.layer-list{flex-wrap:wrap;gap:4px 12px}.tools{bottom:54px}.scene-caption{font-size:11px}.mode-switch{bottom:174px}.scene-area{height:760px}#viewport{bottom:185px}}

.ghost-key{pointer-events:none}@media(max-width:700px){.ghost-key{bottom:235px}}
/* Observatory shell and physical exploration controls. */
.site-nav{display:flex;align-items:center;gap:30px}.site-nav a{text-decoration:none;color:var(--muted);font-size:14px;padding:12px 0;border-bottom:1px solid transparent}.site-nav a:hover,.site-nav a[aria-current=page]{color:var(--accent);border-color:var(--accent)}body[data-surface=portal] header{gap:30px}body[data-surface=portal] header .site-nav{margin-left:auto}footer a{text-decoration:none}footer a:hover{color:var(--accent)}.lab-options{display:flex;flex-wrap:wrap;align-items:center;gap:18px 28px;padding:15px 36px;background:#0d1a22;border-top:1px solid var(--rule)}.lab-options label{font-size:13px;min-height:28px;display:flex;align-items:center;gap:8px;cursor:pointer}.lab-options input{accent-color:var(--accent);width:16px;height:16px}.lab-options>span{font-size:12px;color:var(--muted);margin-left:auto;font-variant-numeric:tabular-nums}.particle-journey{display:grid;grid-template-columns:1fr 1.4fr;gap:44px;padding:25px 36px;background:var(--paper);border-top:1px solid var(--rule)}.particle-journey h2{font-size:23px;font-weight:400;letter-spacing:-.02em;margin:0 0 10px}.particle-journey p{font-size:13px;color:var(--muted);max-width:48ch;margin:0}.particle-transport label{display:block;font-size:12px;color:var(--muted);margin-top:10px}#particle-play{min-height:40px;color:var(--accent);font-size:13px;border-bottom:1px solid var(--accent)}.particle-stops{display:flex;justify-content:space-between;gap:15px}.particle-stops button{font-size:12px;color:var(--muted);min-height:40px;text-align:left}.particle-stops button:hover{color:var(--accent)}.split-labels{position:absolute;inset:0;pointer-events:none;display:grid;grid-template-columns:1fr 1fr;align-items:start;padding:24px 0;color:var(--muted);font-size:12px;text-align:center}.split-labels span{padding:5px 10px;background:#080e13c9;justify-self:center}.scene-area.is-split .intro{display:none}.scene-area.is-split .tools{top:auto;bottom:55px}.scene-area.is-split .mode-switch{left:25px;bottom:55px}.scene-area.is-split #viewport{inset:0 0 130px}.scene-area.is-split .ghost-key{display:none}.scene-area.is-split .split-labels{padding-top:15px}.lab-options label:has(input:disabled){color:var(--muted)}
@media(max-width:700px){header{flex-wrap:wrap;height:auto;min-height:70px;gap:8px 16px;padding:14px 20px}.site-nav{order:3;width:100%;gap:0;justify-content:space-between;border-top:1px solid var(--rule);padding-top:5px}.site-nav a{font-size:13px;min-height:44px}header .brand{font-size:22px}.lab-options{padding:15px 20px;gap:10px 18px}.lab-options label{font-size:12px}.lab-options>span{margin-left:0;width:100%}.particle-journey{grid-template-columns:1fr;gap:18px;padding:24px 20px}.particle-stops{gap:10px}.particle-stops button{font-size:12px}.scene-area.is-split{height:870px}.scene-area.is-split #viewport{inset:0 0 180px}.scene-area.is-split .mode-switch{left:20px;bottom:143px}.scene-area.is-split .tools{bottom:48px}.split-labels{grid-template-columns:1fr;grid-template-rows:1fr 1fr;padding:15px 0}.scene-area.is-split .scene-caption span:last-child{max-width:180px}}