:root{--ink:#183746;--muted:#627370;--teal:#33796b;--paper:#f8f8f1;--line:#dce1d6;--serif:Georgia,'Times New Roman',serif;--sans:-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:15px;-webkit-font-smoothing:antialiased}a{color:inherit}button,input{font:inherit}.page-width{width:min(1240px,calc(100% - 96px));margin-inline:auto}.skip-link{position:fixed;top:10px;left:12px;padding:10px;background:#fff;z-index:10;transform:translateY(-150%)}.skip-link:focus{transform:translateY(0)}:focus-visible{outline:3px solid 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#dae3d6;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:17px 23px;background:#f3f6ed}.demo-footer p{margin:0;font-size:9px;color:#748779}.demo-footer a{font-size:9px;color:#356951;font-weight:600;text-decoration:none;white-space:nowrap}.demo-footer a:hover{text-decoration:underline}.no-script{padding:10px 25px;font-size:12px}.intro-strip{border-block:1px solid var(--line);display:grid;grid-template-columns:1.1fr 1fr 36px 1fr 36px 1fr;align-items:center;gap:22px;padding-block:25px}.intro-label{font-size:8px;letter-spacing:1.6px;line-height:1.9;color:#8a958b}.intro-strip p{font-size:12px;line-height:1.8;color:#819087;margin:0}.intro-strip strong{font-weight:500;color:#405d54}.strip-arrow{color:#9aaf9f;font-size:22px;font-family:var(--serif)}.activities-section{padding-top:80px;padding-bottom:66px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:25px;margin-bottom:29px}.section-heading 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0}.share-actions{display:flex;flex-direction:column;align-items:center;gap:16px;min-width:170px}.copy-button{border:0;background:transparent;cursor:pointer;color:#59735d}#share-status{margin:0;font-size:10px;color:#50705c;min-height:14px;max-width:220px;text-align:center;line-height:1.6}.site-footer{border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr auto;align-items:start;gap:28px;padding-block:29px 34px}.footer-brand{text-decoration:none;font-size:16px;font-weight:650;letter-spacing:-.5px}.footer-brand span{font-size:9px;letter-spacing:1px;font-weight:400;margin-left:5px}.site-footer>div>p{font-size:9px;color:#8b9688;margin:8px 0 0}.footer-links{display:flex;gap:19px;padding-top:5px;flex-wrap:wrap}.footer-links a{font-size:9px;color:#778774;text-decoration:none}.footer-note{font-size:8px;line-height:1.8;color:#94a08e;margin:4px 0 0;text-align:right}
html[lang=zh-CN] .hero h1{font-family:var(--sans);font-size:clamp(53px,5.7vw,78px);font-weight:550;letter-spacing:-2px;line-height:1.18}html[lang=zh-CN] .click-word{font-style:normal}html[lang=zh-CN] h2{font-family:var(--sans);font-weight:500;letter-spacing:-1px}html[lang=zh-CN] .activity-card h3,html[lang=zh-CN] .lesson-steps h3{font-family:var(--sans);font-weight:500;line-height:1.4}html[lang=zh-CN] .hero-description{line-height:1.9}html[lang=zh-CN] .eyebrow{letter-spacing:2px}html[lang=zh-CN] .teacher-description,html[lang=zh-CN] .lesson-steps p{line-height:2}
@media(min-width:1500px){.page-width{width:min(1280px,calc(100% - 140px))}.hero{padding-top:75px;gap:80px}.hero h1{font-size:96px}}
@media(max-width:1080px){.page-width{width:calc(100% - 64px)}.hero{gap:32px;padding-top:42px}.hero h1{font-size:74px}.hero-actions{gap:17px}.hero-actions .text-link{font-size:10px}.hero-description{font-size:15px}.hero .button{padding:14px 17px;font-size:12px}.site-header nav{gap:22px}.teacher-inner{gap:65px}.activity-body{padding:21px 19px}.activity-card h3{font-size:23px}.activity-meta{font-size:7px}.share-section{grid-template-columns:49px 1fr auto;gap:22px}.share-symbol{height:47px;width:47px}.site-footer{grid-template-columns:1fr 1.3fr}.footer-note{display:none}.intro-strip{gap:15px;grid-template-columns:1fr 1fr 20px 1fr 20px 1fr}}
@media(max-width:780px){.page-width{width:calc(100% - 40px)}.site-header{padding-top:20px;padding-bottom:20px}.brand{font-size:23px}.brand svg{width:29px;height:32px}.brand-chinese{font-size:8px;letter-spacing:3px}.site-header nav{gap:18px;font-size:11px}.site-header .nav-button{display:none}.hero{grid-template-columns:1fr;gap:35px;padding-top:27px;padding-bottom:38px}.hero-copy{max-width:560px}.hero h1{font-size:77px;letter-spacing:-4px;line-height:1.02}.hero-description{max-width:395px;font-size:16px}.hero-description{margin-bottom:22px}.hero-actions{gap:25px}.hero-actions .text-link{font-size:11px}.hero-note{margin-top:15px}.hero-demo{transform:none;width:100%;max-width:620px}.demo-topline{padding-top:19px}.cylinder-visual{aspect-ratio:600/325}.demo-controls{margin-bottom:17px}.demo-footer p,.demo-footer a{font-size:10px}.intro-strip{grid-template-columns:1fr 1fr 1fr;gap:20px;padding-block:22px}.intro-label,.strip-arrow{display:none}.intro-strip p{font-size:10px}.activities-section{padding-block:47px}.section-heading{align-items:start;flex-direction:column;gap:15px;margin-bottom:24px}h2{font-size:36px}.section-heading>p{font-size:12px}.desktop-break{display:none}.activity-grid{gap:15px}.activity-picture svg{padding:12px 8px 0}.activity-body{padding:18px 14px}.activity-meta{font-size:6px;letter-spacing:.5px;flex-direction:column;gap:6px;margin-bottom:12px}.activity-card h3{font-size:20px;line-height:1.2}.activity-card h3 br{display:none}.activity-body>p:not(.activity-meta){font-size:10px;line-height:1.8;min-height:70px;margin-bottom:17px}.activity-link{font-size:9px;gap:9px;align-items:center}.picture-tag{font-size:6px;top:12px;left:12px}.more-experiments{align-items:start}.more-experiments p{max-width:400px}.preview-badge{display:none}.teacher-inner{gap:35px;padding-block:45px}.teacher-inner h2{font-size:36px}.teacher-inner .eyebrow{font-size:8px;letter-spacing:1.3px}.teacher-description{font-size:11px}.teacher-inner .button{font-size:10px;padding:14px;gap:15px}.lesson-steps{margin-top:0}.lesson-steps li{gap:13px;padding-block:20px}.lesson-steps h3{font-size:20px}.lesson-steps p{font-size:10px}.step-number{width:25px;height:25px;flex-basis:25px;font-size:8px}.share-section{grid-template-columns:1fr auto;gap:25px;padding-block:44px}.share-symbol{display:none}.share-copy h2{font-size:29px}.share-copy .eyebrow{font-size:8px}.share-copy>p:last-child{font-size:10px}.share-actions .button{font-size:11px;padding:14px 16px}.share-actions{min-width:150px}.site-footer{gap:17px}.footer-links{gap:14px;justify-content:end}.footer-links a{font-size:8px}}
@media(max-width:520px){.page-width{width:calc(100% - 36px)}.site-header nav{gap:17px}.site-header nav>a:nth-child(2){display:none}.site-header{padding-block:17px}.hero{padding-top:27px;gap:29px}.hero .eyebrow{font-size:8px;letter-spacing:1.3px;margin-bottom:21px}.hero h1{font-size:67px;letter-spacing:-3.7px;margin-bottom:24px}.click-word svg{height:13px;bottom:-5px}.hero-description{font-size:14px;max-width:305px;line-height:1.8}.hero-actions{gap:17px;align-items:center}.hero-actions .text-link{font-size:9px;gap:7px}.hero .button{font-size:11px;padding:14px 16px;gap:13px}.hero-note{font-size:9px}.hero-note svg{width:14px}.demo-topline{padding:18px 18px 0}.demo-label,.demo-number{font-size:6px;letter-spacing:1px}.cylinder-visual{aspect-ratio:600/360}.demo-controls{margin:0 22px 17px}.demo-controls label{font-size:10px;margin-bottom:14px}.demo-footer{padding:14px 17px;gap:8px}.demo-footer p{font-size:8px}.demo-footer a{font-size:8px}.intro-strip{gap:13px;padding-block:19px}.intro-strip p{font-size:8px}.activities-section{padding-top:43px;padding-bottom:40px}.section-heading .eyebrow{font-size:8px;letter-spacing:1.5px}h2{font-size:32px}.section-heading>p{font-size:11px;line-height:1.8;max-width:295px}.activity-grid{grid-template-columns:1fr;gap:20px}.activity-card{display:grid;grid-template-columns:38% 1fr;align-items:stretch}.activity-picture{height:100%;aspect-ratio:auto;overflow:hidden}.activity-picture svg{position:absolute;inset:15% -65% auto;width:230%;height:70%;padding:0}.picture-tag{top:14px;left:13px;font-size:7px}.activity-body{padding:20px 18px}.activity-meta{flex-direction:row;font-size:6px;gap:5px;margin-bottom:13px;letter-spacing:.5px}.activity-card h3{font-size:23px;margin-bottom:12px}.activity-body>p:not(.activity-meta){font-size:10px;min-height:0;line-height:1.7;margin-bottom:17px}.activity-link{font-size:9px;padding-top:14px}.activity-link span{font-size:14px}.more-experiments{margin-top:18px}.more-experiments p{font-size:10px;line-height:1.9}.teacher-inner{grid-template-columns:1fr;gap:29px;padding-block:39px}.teacher-inner h2{font-size:37px}.teacher-description{font-size:12px;max-width:340px;margin-block:20px}.teacher-inner .eyebrow{font-size:8px}.teacher-inner .button{font-size:11px;padding:14px 18px}.teacher-small{font-size:9px}.lesson-steps li{gap:18px;padding-block:21px}.lesson-steps h3{font-size:23px}.lesson-steps p{font-size:11px;line-height:1.8}.step-number{width:29px;height:29px;flex-basis:29px;font-size:9px}.share-section{grid-template-columns:1fr;gap:25px;padding-block:39px}.share-copy h2{font-size:33px}.share-copy>p:last-child{font-size:11px}.share-actions{align-items:start;flex-direction:row;flex-wrap:wrap;gap:20px}.share-actions .button{font-size:11px}.copy-button{font-size:10px}#share-status{flex-basis:100%;text-align:left;max-width:none;min-height:0;margin-top:-7px}.site-footer{grid-template-columns:1fr;gap:19px;padding-block:26px}.footer-links{justify-content:start;gap:22px;padding-top:0}.footer-links a{font-size:9px}.footer-brand{font-size:16px}.site-footer>div>p{font-size:9px}html[lang=zh-CN] .hero h1{font-size:51px;letter-spacing:-1.5px}html[lang=zh-CN] .activity-card h3{font-size:21px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}.button-primary:hover{transform:none}}

/* Real 3D previews share the experiment renderer and keep a static fallback. */
.hero{grid-template-columns:.88fr 1.12fr;gap:42px}.hero-demo{transform:none;background:#13283a;border-color:#253f50;box-shadow:0 20px 55px #17312b1c}.hero-demo .demo-topline{padding:21px 24px 0}.hero-demo .demo-label{color:#c4e5d7;font-size:9px;letter-spacing:1.8px}.hero-demo .demo-number{color:#94aeb5;font-size:9px}.hero-demo .live-dot{background:#8bdac1;box-shadow:0 0 9px #7cd6bb88}.preview-stage{position:relative;isolation:isolate;overflow:hidden;background:radial-gradient(ellipse at 45% 40%,#274c58 0,#172e40 55%,#102234 100%)}.hero-preview-stage{aspect-ratio:auto;height:350px;background:radial-gradient(ellipse at 48% 40%,#2b535b 0,#182f40 50%,#13283a 80%)}.preview-stage canvas{display:block;width:100%;height:100%;opacity:0;transition:opacity .3s}.preview-stage.webgl-ready canvas{opacity:1}.hero-preview-stage canvas{position:absolute;inset:0;touch-action:pan-y;cursor:grab}.hero-preview-stage canvas:active{cursor:grabbing}.preview-fallback{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.webgl-ready .preview-fallback{display:none}.webgl-unavailable canvas{visibility:hidden}.stage-drag-hint{position:absolute;left:24px;top:18px;z-index:1;pointer-events:none;font-size:12px;color:#b7d0d1;display:flex;align-items:center;gap:8px}.stage-drag-hint>span{font-size:10px;letter-spacing:.4px}.stage-formula{position:absolute;right:24px;bottom:14px;pointer-events:none;font:italic 20px Georgia,serif;color:#a9ddc8;letter-spacing:1px}.stage-status{position:absolute;left:24px;right:24px;bottom:16px;color:#cce4de;font-size:11px;line-height:1.6;pointer-events:none;margin:0;max-width:320px}.stage-status:empty{display:none}.webgl-unavailable .stage-drag-hint,.webgl-unavailable .stage-formula{display:none}.preview-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 24px 20px;color:#a8c4c4;font-size:10px}.preview-toolbar>span{max-width:160px;line-height:1.7}.preview-toolbar>div{display:flex;gap:7px}.preview-toolbar button{font:inherit;border:1px solid #587177;background:transparent;color:#c9ded8;border-radius:5px;padding:8px 9px;cursor:pointer;white-space:nowrap}.preview-toolbar button:hover{background:#ffffff0d}.preview-toolbar button[aria-pressed=true]{background:#9cd9c21c;border-color:#7caa9f;color:#d3f6e5}.preview-toolbar button:disabled{opacity:.45;cursor:default}.hero-demo .demo-controls{background:#edf2e8;margin:0;padding:22px 24px 17px}.hero-demo .demo-controls label{font-size:12px;color:#355c50}.hero-demo .demo-controls output{font-size:12px}.hero-demo .range-labels{font-size:9px;color:#74897a}.hero-demo .demo-footer{padding:17px 24px}.hero-demo .demo-footer p{font-size:10px}.hero-demo .demo-footer a{font-size:10px}.hero-demo input:disabled{opacity:.4;cursor:default}.activity-picture.preview-stage{background:radial-gradient(ellipse at 45% 40%,#284d53,#122c38 78%)}.picture-circuit.preview-stage{background:radial-gradient(ellipse at 50% 35%,#2d465e,#142b3f 80%)}.picture-energy.preview-stage{background:radial-gradient(ellipse at 50% 35%,#50463d,#242e37 80%)}.activity-picture canvas{position:absolute;inset:0;pointer-events:none}.preview-stage .picture-tag{z-index:1;color:#d4e8e1;text-shadow:0 1px 8px #13283a}.activity-picture .preview-fallback{padding:10px 18px 0;background:#edf2e8}.activity-picture .picture-tag::before{content:'3D';display:inline-block;font-size:8px;letter-spacing:.5px;padding:3px 5px;margin-right:7px;border:1px solid #bddbd152;border-radius:3px}.hero-preview-stage:focus-within{outline:2px solid #9cddcf;outline-offset:-5px}.hero-preview-stage canvas:focus-visible{outline:0}
@media(max-width:1080px){.hero{gap:27px}.hero-preview-stage{height:330px}.preview-toolbar{padding-inline:20px}.preview-toolbar>span{max-width:130px;font-size:9px}.preview-toolbar button{font-size:9px;padding:8px}.hero-demo .demo-topline{padding-inline:20px}}
@media(max-width:780px){.hero{grid-template-columns:1fr;gap:30px}.hero-demo{max-width:620px}.hero-preview-stage{height:360px}.preview-toolbar>span{max-width:none;font-size:10px}.preview-toolbar button{font-size:10px}.activity-picture canvas{width:100%;height:100%}}
@media(max-width:520px){.hero-preview-stage{height:310px}.hero-demo .demo-topline{padding:19px 18px 0}.hero-demo .demo-label,.hero-demo .demo-number{font-size:8px}.stage-drag-hint{left:18px;top:16px}.stage-formula{right:18px;font-size:18px}.preview-toolbar{padding:5px 18px 17px}.preview-toolbar>span{font-size:8px;max-width:115px}.preview-toolbar button{font-size:9px;padding:8px}.hero-demo .demo-controls{padding:20px 20px 16px}.hero-demo .demo-footer{padding:14px 18px}.hero-demo .demo-footer p,.hero-demo .demo-footer a{font-size:9px}.activity-picture .preview-fallback{inset:0;width:100%;height:100%;padding:0}.activity-picture .picture-tag{left:10px;top:12px;font-size:6px}.activity-picture .picture-tag::before{font-size:7px;padding:2px 3px;margin-right:4px}}
@media(prefers-reduced-motion:reduce){.preview-stage canvas{transition:none}}
.activity-picture:not(.webgl-ready) .picture-tag{color:#425e58;text-shadow:none}