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@media(max-width:560px){:root{--gutter:24px}.site-header{height:82px;gap:20px}.brand{font-size:30px}nav{gap:21px;font-size:12px}.hero{min-height:790px;height:100svh;max-height:980px}.hero-kicker{top:110px;right:var(--gutter);font-size:12px;letter-spacing:.05em}.hero-kicker>span{padding:0 9px}.hero-visual{top:135px;left:-4%;right:-18%;bottom:288px}.hero-visual::after{background:linear-gradient(0deg,var(--black),transparent 29%)}.field-label{top:5px;left:54%;font-size:12px;line-height:1.5;gap:8px}.field-label .crosshair{font-size:19px}.field-label small{font-size:12px;max-width:150px;line-height:1.4}.field-label span:not(.crosshair){display:inline;margin-left:5px}.view-controls{bottom:18px;right:22%;}.motion-toggle{font-size:12px;gap:7px;padding:8px 0}.pause-symbol{width:7px;height:8px}.hero-copy{bottom:94px;width:calc(100% - 48px)}.hero h1{font-size:clamp(61px,13.3vw,79px);line-height:1.01;letter-spacing:-.065em}.hero-copy>p{font-size:15px;line-height:1.55;margin-top:20px}.hero-link{margin-top:23px;padding-top:13px;width:100%;font-size:12px}.hero-bottom{font-size:12px;letter-spacing:.035em;bottom:24px}.hero-bottom>span:last-child{gap:10px}.hero-bottom>span:first-child{max-width:200px}.scroll-line{height:24px}.introduction{padding-top:34px}.section-label{font-size:12px;letter-spacing:.035em;gap:14px}.section-label>span:last-child{text-align:right}.intro-grid{display:block;padding-top:45px;padding-bottom:35px}.intro-grid h2{font-size:48px;letter-spacing:-.06em}.intro-copy{margin-top:34px;max-width:none}.intro-copy .lead{font-size:24px;line-height:1.35;margin-bottom:18px}.intro-copy>p:not(.lead){font-size:15px;line-height:1.7;margin-top:16px}.subjects{gap:14px 24px;font-size:12px;padding:24px 0}.exploration{padding-top:17px;padding-bottom:33px}.exploration>.section-label{padding-top:22px}.explore-heading{display:block;margin:41px 0 34px}.explore-heading h2{font-size:45px}.explore-heading>p{max-width:none;font-size:14px;margin-top:24px}.experiment{display:flex;flex-direction:column;gap:33px}.experiment-figure{width:100%}.figure-top{font-size:12px;padding-bottom:13px}.concentration-key{font-size:12px;margin-bottom:25px}.color-key{font-size:12px}.color-key i{width:70px}.profile-header{font-size:12px;padding-top:15px}.experiment-controls{width:100%;border-top:1px solid var(--line);padding-top:25px}.interaction-label{font-size:12px;letter-spacing:.01em}.accent-square{width:5px;height:5px}.experiment-controls h3{font-size:34px;margin:22px 0 17px}.experiment-controls>p{font-size:15px;max-width:none}.radius-control{margin-top:30px}.radius-control label{font-size:14px}.radius-control output{font-size:29px}.radius-control output span{font-size:15px}.radius-control>p{font-size:12px}.range-ends{font-size:12px}.result-line{display:flex;gap:25px;padding:23px 0;margin-top:24px}.result-line>output{font-size:46px;min-width:109px}.result-line p{margin-top:0;font-size:12px}.result-line small{font-size:12px;max-width:160px}.experiment-controls>.fixed-inputs{font-size:12px}.line-button{font-size:13px}.experiment-caption{margin-top:34px;font-size:12px}.companions{padding-top:37px;padding-bottom:0}.collection-heading{display:block;margin:45px 0 38px}.collection-heading h2{font-size:53px}.collection-heading>p{font-size:14px;margin-top:24px}.collection-heading>p br:nth-child(2){display:none}.companion-row{grid-template-columns:20px 1fr;gap:20px;padding:28px 0 32px}.chapter-number{font-size:12px;padding-top:1px}.topic-meta{font-size:12px;gap:7px 13px}.status{font-size:12px}.companion-body h3{font-size:30px;line-height:1.1;margin:19px 0 16px;letter-spacing:-.045em}.companion-body p{font-size:13px;line-height:1.6}.concept-button{font-size:12px;gap:24px}.round-plus{width:31px;height:31px;font-size:20px}.method{padding-top:48px;padding-bottom:47px}.method-steps{display:block;margin-top:22px}.method-steps article{display:grid;grid-template-columns:20px 1fr;column-gap:20px;padding-top:28px}.step-number{font-size:12px;padding-top:10px}.method-steps h3{margin:0 0 15px;font-size:54px}.method-steps p{grid-column:2;font-size:14px;max-width:300px}.about{padding-top:33px;padding-bottom:45px}.about-grid{display:block;margin-top:44px}.about h2{font-size:45px}.about-copy{margin-top:33px}.about-copy .lead{font-size:24px}.about-copy>p:not(.lead){font-size:15px}.about summary{font-size:13px}.about details p{font-size:14px}footer{padding-top:32px;padding-bottom:23px}.footer-top{gap:22px 20px}.footer-top>.brand{font-size:30px}.footer-top>span{font-size:12px;line-height:1.6;max-width:140px;letter-spacing:.04em}.footer-top>a:last-child{width:100%;margin:0;font-size:12px}.footer-bottom{font-size:12px;line-height:1.6;margin-top:26px;padding-top:19px;gap:23px}.footer-bottom>span:last-child{text-align:right}dialog{padding:38px 25px;max-height:88svh}dialog h2{font-size:33px;line-height:1.1;margin-top:25px}dialog p,dialog li{font-size:14px}dialog .eyebrow{font-size:12px}.equation{font-size:12px}.text-link{font-size:12px}}
@media(max-width:370px){:root{--gutter:19px}nav{gap:15px;font-size:12px}.hero-copy{width:calc(100% - 38px)}.hero h1{font-size:62px}.hero-kicker{font-size:12px}.hero-kicker>span{padding:0 7px}.hero-bottom{font-size:12px}.field-label{left:51%}.field-label span:not(.crosshair){display:block;margin-left:0}.section-label{font-size:12px}.intro-grid h2{font-size:43px}.explore-heading h2{font-size:40px}.collection-heading h2{font-size:48px}.companion-body h3{font-size:27px}.result-line{gap:14px}.result-line>output{min-width:105px}.about h2{font-size:40px}.subjects{gap:12px 18px}.footer-top>span{font-size:12px}.footer-bottom{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}

/* Data annotations are real buttons: hover, touch, and keyboard share one explanation. */
.particle-stage{position:relative}.particle-stage #particle{margin-top:8px}.part-marker{position:absolute;top:50.91%;width:44px;height:44px;padding:0;transform:translate(-50%,-50%);background:none;border:0;color:#fff;display:flex;align-items:center;justify-content:center;z-index:1}.core-marker{left:50%}.surface-marker{left:68.75%}.marker-point{display:block;width:12px;height:12px;background:#fff;border:3px solid #404a68;border-radius:50%;box-shadow:0 0 0 1px #fff;transition:box-shadow .2s}.part-marker[aria-pressed=true] .marker-point,.part-marker:hover .marker-point{box-shadow:0 0 0 1px #fff,0 0 0 5px #fff3}.marker-label{position:absolute;left:50%;top:36px;transform:translateX(-50%);font-size:12px;line-height:1.2;color:#edeff4;text-shadow:0 1px 3px #191e2a;background:#2b3140;padding:3px 5px}.part-explanation{font-size:14px;line-height:1.6;color:#5b6172;min-height:64px;margin:5px 0 22px;max-width:490px}.part-marker:focus-visible{outline-color:#2a3452;outline-offset:0}
/* Keep supporting typography legible on every viewport. */
nav{font-size:14px}.header-note,.hero-kicker,.eyebrow,.section-label,.hero-bottom,.field-label,.field-label small,.view-controls>span,.figure-top,.profile-header,.interaction-label,.topic-meta,.status,.chapter-number,.step-number,.subjects,.footer-top>span,.footer-bottom{font-size:12px}.motion-toggle,.hero-link,.line-button,.concept-button,.footer-top>a:last-child,.text-link{font-size:14px}.intro-copy>p:not(.lead),.about-copy>p:not(.lead),.experiment-controls>p:not(.fixed-inputs),.companion-body p,.method-steps p,.explore-heading>p,.collection-heading>p{font-size:16px}.radius-control label{font-size:14px}.radius-control>p,.range-ends,.experiment-controls>.fixed-inputs,.result-line small,.experiment-caption,.concentration-key,.color-key{font-size:12px}.result-line p,.about summary{font-size:14px}.about details p{font-size:15px}.footer-bottom{line-height:1.6}.field-label{max-width:290px}.hero-kicker{font-size:12px}.hero-bottom{font-size:12px}.header-note{font-size:12px}.field-label span:not(.crosshair){display:block;margin-left:0}.hero-visual::after{z-index:1}.field-label,.view-controls{z-index:2}.hero-visual{z-index:0}.hero-copy,.hero-kicker,.hero-bottom{z-index:2}.hero-copy{pointer-events:none}.hero-copy a{pointer-events:auto}
@media(max-width:1150px){.header-note{display:none}.site-header nav{margin-left:auto}.result-line{flex-wrap:wrap;gap:15px}.result-line p{margin-top:0}.figure-top{flex-wrap:wrap}.figure-top>span:nth-child(2){flex:1}.experiment-controls>.fixed-inputs{line-height:1.7}.view-controls{right:17%}.hero-kicker{font-size:12px}}
@media(max-width:800px){.hero-visual{z-index:0}.hero-visual::after{background:linear-gradient(0deg,var(--black),transparent 50%)}.hero-copy{z-index:2}.hero-kicker{font-size:12px}.hero-bottom{font-size:12px}.field-label{max-width:220px}.field-label small{max-width:180px}.section-label{font-size:12px}.subjects{font-size:12px}.figure-top,.profile-header{font-size:12px}.interaction-label{font-size:12px}.result-line small{font-size:12px}.result-line p{font-size:14px}.result-line{display:block}.result-line p{margin-top:12px}.footer-top>span,.footer-bottom{font-size:12px}.part-explanation{font-size:13px;min-height:92px}.topic-meta,.status{font-size:12px}.concentration-key{flex-wrap:wrap;gap:7px}.experiment-controls>.fixed-inputs{font-size:12px}.method-steps h3{font-size:47px}}
@media(max-width:560px){.site-header{gap:12px}nav{gap:16px;font-size:14px}.hero-kicker{font-size:12px;max-width:330px;line-height:1.6}.hero-kicker>span{padding:0 8px}.hero-bottom{font-size:12px;max-width:calc(100% - 48px)}.hero-bottom>span:first-child{max-width:140px;line-height:1.6}.field-label{font-size:12px;left:52%;max-width:180px;top:9px}.field-label span:not(.crosshair){display:block;margin-left:0}.field-label small{font-size:12px;line-height:1.4;max-width:175px}.view-controls{right:20%}.motion-toggle{font-size:12px}.section-label{font-size:12px;line-height:1.6}.section-label>span:first-child{flex-shrink:0}.subjects{font-size:12px;gap:15px 25px}.figure-top,.profile-header{font-size:12px}.interaction-label{font-size:12px}.part-explanation{min-height:67px;font-size:14px;margin-bottom:22px}.concentration-key{font-size:12px;flex-wrap:nowrap}.experiment-controls>.fixed-inputs{font-size:12px}.result-line{display:flex;flex-wrap:nowrap;gap:18px}.result-line p{margin:0;font-size:13px}.result-line small{font-size:12px;max-width:none}.topic-meta,.status{font-size:12px}.companion-body p,.method-steps p{font-size:16px}.concept-button{font-size:14px}.about summary{font-size:14px}.footer-top>span{font-size:12px;max-width:190px}.footer-top>a:last-child{font-size:14px}.footer-bottom{font-size:12px}.footer-bottom>span:first-child{max-width:155px}.footer-bottom>span:last-child{max-width:160px}.hero-link{font-size:14px}dialog .eyebrow{font-size:12px}dialog p,dialog li{font-size:16px}.equation{font-size:12px}.text-link{font-size:14px}}
@media(max-width:370px){.brand{font-size:27px}nav{gap:13px;font-size:13px}.hero-kicker{font-size:12px}.hero-bottom{font-size:12px}.hero-bottom>span:first-child{max-width:140px}.field-label{left:53%;max-width:160px}.field-label small{font-size:12px}.section-label{font-size:12px}.figure-top,.profile-header,.topic-meta,.status{font-size:12px}.result-line{flex-wrap:wrap}.part-explanation{min-height:90px}}

.motion-toggle,.marker-label,.result-line p,nav{font-size:14px}

/* Dark surface for the model section, matching the collection. */
.light-section{--white:#121729;--ink:#eff2fb;--muted:#aeb4c7;--line:#2a3149}
.figure-top,.profile-header{color:#a0a8bf}
.color-key i{background:linear-gradient(90deg,#1c2a4d,#84a4ff)}
.light-section input[type=range]::-webkit-slider-thumb{background:var(--accent);outline-color:var(--accent)}
.light-section input[type=range]::-moz-range-thumb{background:var(--accent);outline-color:var(--accent)}
.experiment-caption{color:#a0a8bf}
dialog{--white:#14192a;--ink:#eff2fb;--muted:#aeb4c7;--line:#2a3149}
/* The dialog turned dark with the palette lift; its words keep light ink (body about 8:1, never under 4.5:1). */
dialog p,dialog li{color:var(--muted)}dialog .eyebrow{color:#a0a8bf}.dialog-close{color:#c6cbd5}.dialog-close:hover{background:#ffffff14}.text-link:hover,.light-section .line-button:hover{color:var(--accent)}
.light-section .section-label,.light-section #part-explanation,.light-section .concentration-key,.light-section .interaction-label,.light-section .range-ends,.light-section #radius-help,.light-section .fixed-inputs{color:#a0a8bf}
/* Narrow stages draw the cross section small, and the core's two lines need a little more room under the 100 nm particle:
   the frame is 5 % taller there (the drawing keeps its scale), enough for 8 px clear of the disk at 296 to 342 px wide. */
@media(max-width:800px){.particle-stage #particle{aspect-ratio:560/400}}
@media(max-width:700px){.field-label{z-index:2}.field-label>div{background:rgba(15,17,27,.78);padding:4px 8px 6px;border-radius:4px}}