/* Product shell. Photography gives context; the simulated apparatus stays legible. */
:root{--ink:#223248;--navy:#203d61;--blue:#315d8b;--muted:#657285;--amber:#a76d3d;--paper:#f2f4f7;--line:#dbe1e9}
body{background:#f2f4f7;color:var(--ink);font-size:17px;line-height:1.75}
.site-header{background:#fff;border-bottom:1px solid #dde3eb;color:var(--ink);box-shadow:none;position:relative;z-index:3}
.header-inner{max-width:1220px;min-height:84px;margin:auto;padding:14px 26px;gap:30px}
.brand{color:#203d61;font-size:22px;gap:11px;text-decoration:none;white-space:nowrap}
.brand-mark{width:42px;height:44px;display:grid;place-items:center;border-radius:13px 4px 13px 4px;background:#24476e;color:#fff;font-size:23px;border:0}
.brand small{color:#6c7989;font-size:11px;letter-spacing:.06em;margin-top:0}
.site-header nav{margin-left:auto;gap:5px}.site-header nav :is(a,button){color:#627184;background:transparent;border-radius:6px;font-size:15px;padding:10px 16px;white-space:nowrap;line-height:1.5;text-decoration:none;border:0}
.site-header nav :is(a,button).active{background:#eaf0f7;color:#203d61}.site-header nav :is(a,button):hover{background:#f0f3f7;color:#203d61}.site-header nav small{display:none}
.account-btn,.account-link{border:1px solid #c8d4e2;background:#fff;color:#203d61;border-radius:6px;font-size:14px;padding:8px 12px;white-space:nowrap;text-decoration:none}
.shell{max-width:1220px;padding:28px 26px 42px}.page-heading h1,.experiment-heading h1{font-size:30px;letter-spacing:.01em}.eyebrow{font-size:12px;letter-spacing:.07em;color:#8c653e}.page-heading p:not(.eyebrow),.intro{font-size:16px;line-height:1.8}
.panel,.paper{border:1px solid #dce3eb;border-radius:12px;box-shadow:0 3px 12px #213d5b05;background:#fff}.primary{background:#254b76;border-color:#254b76;font-size:15px;min-height:44px;border-radius:7px}.primary:hover{background:#1b3c61}.secondary{font-size:14px;min-height:42px}.muted,.small{color:#657285;font-size:14px}.text-btn,.text-button{font-size:13px}.panel h2,.paper h2{font-size:20px}
.home-hero{position:relative;isolation:isolate;padding:44px 44px 32px;min-height:416px;border-radius:14px;overflow:hidden;background:#19344f url('/media/optics-lab.webp') center 45%/cover}
.home-hero::before{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#10243bf2 0%,#142d45db 48%,#142a4266 100%);z-index:-1}
.home-hero .eyebrow{color:#d8bd94;margin-bottom:10px;font-size:13px}.home-hero h1{color:#fff;font-size:37px;line-height:1.4;margin-bottom:12px;font-weight:650;letter-spacing:.025em}.hero-description{color:#e0e7ed;max-width:580px;font-size:16px;line-height:1.9;margin-bottom:22px}
.question-launcher{max-width:710px;background:#fff;padding:13px 14px 13px 19px;display:flex;gap:14px;align-items:center;border-radius:9px;box-shadow:0 7px 24px #06152629}
.question-launcher label{flex:1;min-width:0}.question-launcher input{border:0;padding:7px 0;margin:0;outline-offset:4px;font-size:17px;background:transparent}.question-launcher .primary{flex-shrink:0}.question-caption{font-size:12px;color:#c9d6e1;margin:9px 0 14px}.home-prompts{display:flex;flex-wrap:wrap;gap:9px}.home-prompts button{font-size:13px;color:#f0f4f8;border:1px solid #ffffff50;background:#ffffff09;padding:6px 12px;border-radius:20px;font-weight:400}.home-prompts button:hover{background:#ffffff20}
.hero-photo-label{position:absolute;right:20px;bottom:12px;color:#ffffffa6;font-size:10px;letter-spacing:.04em}.home-results{margin-top:18px;background:white;border:1px solid #d8e0e8;padding:18px 22px;border-radius:10px}.home-results-label{font-size:14px;color:#677789;margin:0 0 9px}.question-result{display:grid;grid-template-columns:30px 1fr auto;gap:12px;padding:11px 0;color:#244970;text-decoration:none;border-bottom:1px solid #e9edf2;font-size:16px}.question-result:last-child{border:0}.question-result>span:last-child{font-size:13px}.result-number{font:15px/1.8 Consolas,monospace;color:#9a6d42}
.home-section-heading{display:flex;justify-content:space-between;align-items:center;margin:26px 0 13px;gap:14px}.home-section-heading h2{font-size:20px;margin:0}.home-section-heading p{font-size:13px;color:#68778a;margin:2px 0 0}.home-section-heading a{font-size:14px;text-decoration:none;color:#315d8b;white-space:nowrap}
.featured-labs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.featured-lab{position:relative;border:1px solid #d7e0e9;border-radius:11px;background:#fff;padding:20px 22px 18px;text-decoration:none;color:#223248;transition:transform .15s,border-color .15s}.featured-lab:hover{transform:translateY(-3px);border-color:#6c87a5}.featured-number{font:19px/1.4 Consolas,monospace;color:#9d7147;float:right}.featured-group{font-size:12px;color:#768497}.featured-lab h3{margin:9px 0 8px;font-size:20px}.featured-lab p{font-size:14px;color:#66768b;margin:0 0 13px}.featured-action{font-size:13px;color:#305c86}
.home-capabilities{display:flex;gap:25px;flex-wrap:wrap;border-top:1px solid #d7e0e8;margin-top:24px;padding-top:16px;color:#6a788a;font-size:13px}.home-capabilities b{color:#345574;font-weight:600;margin-right:7px}
.page-banner,.experiment-heading{position:relative;isolation:isolate;padding:25px 30px;border-radius:12px;overflow:hidden;background:#1b354e;min-height:165px;margin-bottom:22px;align-items:center}
.page-banner::before,.experiment-heading::before{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,#142e47f5 0%,#1d3a55df 55%,#1b36526b 100%),var(--scene-photo) center/cover}
.page-banner h1,.experiment-heading h1{color:#fff}.page-banner .eyebrow,.experiment-heading .eyebrow{color:#dec29d}.page-banner p:not(.eyebrow),.experiment-heading .intro{color:#e3e9ef}.page-banner .secondary{background:#ffffff14;border-color:#ffffff80;color:#fff}.page-banner .catalog-badge{background:#ffffff17;color:#e9d4b8;border:1px solid #ffffff4a;border-radius:20px;padding:5px 12px;font-size:12px}.page-banner>div,.experiment-heading>div{min-width:0;max-width:75%}
#page-workbench>.page-heading{--scene-photo:url('/media/wind-tunnel.webp')}#page-catalog>.page-heading{--scene-photo:url('/media/research-lab.webp')}#page-evidence>.page-heading{--scene-photo:url('/media/mirror-lab.webp')}
.experiment-heading{--scene-photo:url('/media/magnet-lab.webp')}.experiment-heading[data-theme=motion]{--scene-photo:url('/media/wind-tunnel.webp')}.experiment-heading[data-theme=energy]{--scene-photo:url('/media/research-lab.webp')}.experiment-heading[data-theme=waves]{--scene-photo:url('/media/optics-lab.webp')}.experiment-heading[data-theme=atomic]{--scene-photo:url('/media/mirror-lab.webp')}
.experiment-picker{width:240px;max-width:35%;color:#e2e8ee;font-size:13px;flex-shrink:0}.experiment-picker select{font-size:14px;background:#fffffff5;padding:10px;margin-top:7px}.lab-picker{margin-bottom:16px;border:1px solid #d9e2eb;border-radius:9px;background:#fff;padding:11px 16px}.lab-picker select{font-size:15px}.lab-picker small{font-size:12px}
.catalog-filters{grid-template-columns:minmax(0,1fr) 210px}.catalog-filters label{font-size:14px}.catalog-filters input,.catalog-filters select{padding:11px 12px;font-size:16px}.scope-note{display:none}.course-coverage{display:none}.topic-navigation{display:flex;gap:8px;flex-wrap:wrap;margin:-2px 0 20px}.topic-navigation button{background:#fff;border:1px solid #d6e0e9;border-radius:20px;color:#52687f;padding:7px 15px;font-size:14px;font-weight:400}.topic-navigation button.active{background:#26496e;color:#fff;border-color:#26496e}.topic-navigation small{font-size:12px;margin-left:7px;opacity:.7}
.catalog-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:17px}.catalog-row{position:relative;display:flex;gap:16px;align-items:start;padding:21px 21px 18px;border:1px solid #dce4ed;border-radius:10px;min-height:160px;background:#fff}.catalog-row:hover{background:#f8fafc;border-color:#8ba2ba}.catalog-number{font:24px/1.4 Consolas,monospace;color:#a57c50;min-width:31px}.catalog-row h3{font-size:19px;color:#263e59;margin-bottom:7px;line-height:1.65}.catalog-row p{font-size:13px;line-height:1.8}.catalog-row .catalog-description{font-size:14px;margin:7px 0 13px;color:#657285}.catalog-tag.ready{display:inline-block;background:transparent;color:#345f88;padding:0;font-size:13px;text-align:left}.catalog-empty{grid-column:1/-1}.list-heading{padding:9px 0;border-bottom:1px solid #cbd6e1;font-size:13px}.catalog-pagination{margin-top:22px}.catalog-footnote{font-size:12px;line-height:1.8;color:#778393}
.assistant-panel,.assistant-paper{border-top:3px solid #506e90;background:#fff}.assistant-panel .panel-heading,.assistant-paper .section-title{border-bottom:1px solid #e0e6ee;padding-bottom:13px}.chat-log{background:#f5f7fa;border-radius:9px;padding:13px;height:300px}.bubble{font-size:16px;line-height:1.85;border:1px solid #dfe6ed;box-shadow:none}.chat-message .avatar{background:#2c537d;color:#fff;border-radius:9px}.chat-message.user .avatar{background:#d7c4ad;color:#61492e}.chat-message.user .bubble{background:#e9f0f8;border-color:#d5e0ed;color:#263e5b}.chat-form textarea,#chatForm textarea{font-size:16px;background:#fbfcfe;min-height:106px}.prompt-row button{font-size:13px;border-color:#dce4ec;background:#f6f8fb;color:#4e6884}.assistant-panel .muted,.assistant-paper>.small{font-size:12px}.current-diagnosis{background:#f4f6fa;border-color:#dde5ee;font-size:13px}.context-bar{font-size:12px}.learning-bar{margin-top:0}.flow-nav{border-radius:10px;overflow:hidden}.flow-nav button.active{background:#e9f0f8;color:#244b75;border-color:#335d89}.flow-nav b{font-size:17px}.flow-nav small{font-size:12px}.next-hint{background:#fff;border:1px solid #dce4ec;border-left:3px solid #a78051;padding:12px 16px;border-radius:7px}.operation-guide{background:#fff;border:1px solid #dce4ec;border-left:3px solid #a78051}.operation-guide p{font-size:14px}.operation-guide strong{font-size:16px}
.storage-explanation{margin:0;background:transparent;border:0;font-size:13px}.storage-explanation summary{font-size:13px}.support-details{margin:24px 0 0;border-top:1px solid #d8e0e9;padding-top:15px}.support-details p{font-size:13px;line-height:1.9;max-width:95ch}.site-footer,body>footer{max-width:1220px;font-size:12px;padding:21px 26px;align-items:center}.site-footer button,body>footer .text-button{font-size:12px}.report-sources:empty{display:none}.info-dialog a{overflow-wrap:anywhere}.photo-list{font-size:13px;padding-left:20px;line-height:1.9}.photo-list li{margin-bottom:8px}
.auth-dialog{border-radius:12px}.auth-dialog .eyebrow{color:#976b42}.auth-dialog h2{font-size:25px}.auth-tabs{background:#edf2f7}.auth-tabs .active{background:#fff;color:#224a73}.detail-dialog{width:760px}.detail-section h3{color:#365b7e}.detail-tags span{background:#eef2f7;border-color:#dbe4ee;color:#486888}
@media(min-width:1100px){.workspace[data-stage=design]{grid-template-columns:360px minmax(0,1fr)}.design-layout{grid-template-columns:minmax(0,1fr) 370px}}
@media(max-width:1000px){.header-inner{gap:15px}.site-header nav :is(a,button){padding:9px 11px}.home-hero{padding:32px;min-height:395px}.home-hero h1{font-size:33px}.featured-lab{padding:17px}.featured-lab h3{font-size:18px}.page-banner,.experiment-heading{padding:23px}.experiment-heading>div{max-width:65%}}
@media(max-width:820px){.header-inner{flex-wrap:wrap;padding:13px 20px}.site-header nav{order:3;width:100%;margin:0;justify-content:space-between;border-top:1px solid #e8edf2;padding-top:9px}.site-header nav :is(a,button){flex:1;text-align:center;font-size:14px}.account-btn,.account-link{margin-left:auto}.brand{font-size:21px}.shell{padding:20px}.catalog-list{gap:12px}.catalog-row{padding:16px;gap:11px}.catalog-row h3{font-size:17px}.catalog-number{font-size:21px}.page-banner>div{max-width:100%}.page-banner{align-items:start}.home-capabilities{gap:10px 20px}.featured-lab h3{font-size:17px}.featured-lab p{font-size:13px}.home-section-heading{margin-top:22px}}
@media(max-width:560px){body{font-size:16px}.shell{padding:16px 12px 28px}.header-inner{padding:12px 15px;gap:11px}.brand-mark{width:35px;height:38px;font-size:21px}.brand{font-size:19px;gap:8px}.brand small{font-size:9px;letter-spacing:0}.account-btn,.account-link{font-size:12px;padding:7px 9px}.site-header nav :is(a,button){font-size:13px;padding:8px 5px}.home-hero{padding:26px 20px 29px;min-height:432px;border-radius:10px;background-position:60% center}.home-hero::before{background:linear-gradient(90deg,#10243bf2,#142d45ce)}.home-hero h1{font-size:29px;line-height:1.5;margin-bottom:12px}.hero-description{font-size:14px;line-height:1.9;margin-bottom:17px}.home-hero .eyebrow{font-size:11px}.question-launcher{display:block;padding:11px 13px}.question-launcher input{font-size:15px}.question-launcher .primary{width:100%;margin-top:9px;min-height:40px;font-size:14px}.home-prompts{gap:7px}.home-prompts button{font-size:12px;padding:5px 10px}.question-caption{font-size:10px;line-height:1.8}.hero-photo-label{font-size:9px;right:13px;bottom:8px}.home-section-heading h2{font-size:18px}.home-section-heading p{font-size:12px}.home-section-heading a{font-size:12px}.featured-labs{grid-template-columns:1fr;gap:10px}.featured-lab{padding:17px 19px}.featured-lab h3{font-size:19px;margin:6px 0}.featured-lab p{font-size:14px;margin-bottom:8px}.featured-number{font-size:22px}.featured-group{font-size:12px}.home-capabilities{font-size:12px;display:grid;gap:6px}.home-results{padding:14px}.question-result{grid-template-columns:25px minmax(0,1fr);font-size:15px;gap:3px 8px}.question-result>span:last-child{grid-column:2}.page-banner,.experiment-heading{min-height:150px;padding:21px 19px;border-radius:9px;margin-bottom:17px}.page-banner h1,.experiment-heading h1{font-size:25px}.page-banner p:not(.eyebrow),.experiment-heading .intro{font-size:14px}.page-banner{display:block}.page-banner .secondary,.page-banner .catalog-badge{margin-top:7px}.page-banner>div,.experiment-heading>div{max-width:100%}.experiment-picker{max-width:100%;width:100%;margin-top:13px}.lab-picker{padding:10px 12px}.lab-picker small{display:none}.lab-picker select{font-size:14px}.catalog-filters{grid-template-columns:1fr;gap:11px}.catalog-list{grid-template-columns:1fr;gap:10px}.catalog-row{min-height:145px;padding:17px;gap:12px}.catalog-row h3{font-size:18px}.catalog-row p{font-size:13px}.catalog-row .catalog-description{font-size:14px}.topic-navigation{gap:7px;margin-bottom:16px}.topic-navigation button{font-size:12px;padding:6px 11px}.topic-navigation small{font-size:11px}.list-heading>span:last-child{display:none}.catalog-pagination{gap:6px;flex-wrap:wrap}.flow-nav b{font-size:14px}.flow-nav button>span{font-size:14px}.chat-log{height:280px}.bubble{font-size:15px}.panel h2,.paper h2{font-size:19px}.site-footer,body>footer{padding:18px 15px;gap:9px}.next-hint{font-size:13px}.home-results-label{font-size:13px}}
@media(prefers-reduced-motion:reduce){.featured-lab{transition:none}.featured-lab:hover{transform:none}}
.site-header nav button.active::after,.topic-navigation button.active::after{display:none}
.topic-navigation{margin-left:0;justify-content:flex-start;gap:8px}.topic-navigation button{position:static;flex:none;display:inline-flex;align-items:center;gap:7px;border-radius:20px;line-height:1.5}.topic-navigation button small{display:inline;margin:0;font-size:12px;color:inherit}.topic-navigation button.active{border-radius:20px}
.catalog-pagination{margin-left:0}.experiment-picker select{color:#223248}.flow-nav button.active small{color:#566f8a}
.experiment-heading{min-height:140px;margin-bottom:15px}.experiment-heading .intro{margin-bottom:0}.learning-bar{padding:8px 0;gap:8px 14px;border-top:0}.learning-bar p{font-size:12px}.context-bar{padding:8px 0;margin-top:0;margin-bottom:14px}.flow-nav button{padding-block:11px}.next-hint{padding-block:9px}
@media(max-width:560px){.topic-navigation{gap:7px}.topic-navigation button small{font-size:11px}.experiment-heading{min-height:140px}.learning-bar p{font-size:12px}.context-bar{gap:8px 12px}.context-bar>div{gap:12px}.flow-nav button{padding-block:12px}}

/* A distinct documentary photograph for each experiment. These are scene illustrations. */
.experiment-heading[data-experiment="senior-02"]{--scene-photo:url("/media/scene-07.webp")}
.experiment-heading[data-experiment="senior-11"]{--scene-photo:url("/media/scene-09.webp")}
.experiment-heading[data-experiment="senior-12"]{--scene-photo:url("/media/scene-03.webp")}
.experiment-heading[data-experiment="senior-15"]{--scene-photo:url("/media/scene-12.webp")}
.experiment-heading[data-experiment="senior-17"]{--scene-photo:url("/media/scene-13.webp")}
.experiment-heading[data-experiment="senior-22"]{--scene-photo:url("/media/scene-02.webp")}
.experiment-heading[data-experiment="senior-23"]{--scene-photo:url("/media/scene-10.webp")}
.experiment-heading[data-experiment="senior-35"]{--scene-photo:url("/media/scene-01.webp")}
.experiment-heading[data-experiment="senior-37"]{--scene-photo:url("/media/scene-04.webp")}
.experiment-heading[data-experiment="senior-40"]{--scene-photo:url("/media/scene-17.webp")}
.experiment-heading[data-experiment="senior-42"]{--scene-photo:url("/media/scene-16.webp")}
.experiment-heading[data-experiment="senior-43"]{--scene-photo:url("/media/scene-05.webp")}
.experiment-heading[data-experiment="senior-45"]{--scene-photo:url("/media/scene-14.webp")}
.experiment-heading[data-experiment="senior-58"]{--scene-photo:url("/media/magnet-lab.webp")}
.experiment-heading[data-experiment="senior-61"]{--scene-photo:url("/media/scene-08.webp")}
.experiment-heading[data-experiment="senior-65"]{--scene-photo:url("/media/scene-15.webp")}
.experiment-heading[data-experiment="senior-66"]{--scene-photo:url("/media/scene-11.webp")}
.experiment-heading[data-experiment="senior-78"]{--scene-photo:url("/media/scene-06.webp")}