/* The shared application skin. Content and game mechanics retain their own layouts. */
html:root{--bg:var(--x-bg);--panel:var(--x-panel);--panel2:var(--x-raised);--line:var(--x-line);--text:var(--x-ink);--ink:var(--x-ink);--muted:var(--x-muted);--ink-mute:var(--x-muted);--ink-dim:var(--x-muted);--green:var(--x-accent);--green-bright:color-mix(in srgb,var(--x-accent) 80%,white);--green-ink:var(--x-onaccent);--demo-bg:var(--x-bg);--demo-panel:var(--x-panel);--demo-line:var(--x-line);--demo-green:var(--x-accent);--demo-violet:var(--x-secondary);--demo-blue:var(--x-detail);--demo-amber:#f2bd62;--game-bg:var(--x-bg);--game-surface:var(--x-panel);--game-edge:var(--x-line)}
body.x-experience{background:var(--x-bg);color:var(--x-ink);font-family:'Instrument Sans',system-ui,sans-serif;--game-accent:var(--x-accent);--game-accent-rgb:var(--x-rgb);--g:var(--x-accent)}
body.x-experience:after{display:none}.x-experience .demo-shell{background:transparent!important}.x-experience :is(.demo-aurora,.orbit-dot){display:none}.x-experience .demo-nav{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--x-bg) 94%,transparent);backdrop-filter:blur(16px);border-color:var(--x-line);padding-block:15px}.x-experience .demo-navlinks a{border-radius:0}.x-experience .app-user .btn{border-radius:3px}.x-experience .user-orb{animation:none;box-shadow:none}.x-experience .owner-theme-control{background:var(--x-panel);border-radius:3px}.x-experience .owner-theme-control select{background:var(--x-panel);color:var(--x-ink)}
.x-experience .demo-main{max-width:1440px;padding-inline:4.5vw}.x-experience .demo-hero{grid-template-columns:1.3fr .7fr;padding-block:65px 40px;gap:30px}.x-experience .hero-copy h1{font-family:'Instrument Sans',system-ui,sans-serif;font-weight:500;font-size:clamp(45px,5.5vw,78px);letter-spacing:-.065em;line-height:1.04}.x-experience .hero-copy h1 em{font-family:'Instrument Serif',Georgia,serif;color:var(--x-accent)}.x-experience .hero-copy>p{color:var(--x-muted)}.x-experience .hero-orbit{height:300px;transform:perspective(1000px) rotateY(-15deg)}.x-experience .orbit-logo{width:210px;height:160px;filter:drop-shadow(8px 12px 0 color-mix(in srgb,var(--x-accent) 14%,transparent))!important}.x-experience .orbit-ring{border-radius:0;transform:rotate(45deg);animation:none;width:190px;height:190px;opacity:.25}.x-experience .orbit-two{width:245px;height:245px;opacity:.12}.x-experience .orbit-label{border-radius:0;background:var(--x-panel);border-color:var(--x-line)}.x-experience .hero-search{border-radius:0;background:var(--x-panel);box-shadow:none;max-width:600px}.x-experience .hero-search input{color:var(--x-ink)}.x-experience .workspace-strip{border-radius:0;box-shadow:none;background:transparent!important;border-inline:0}.x-experience .workspace-strip article{padding-block:20px}.x-experience .workspace-strip small,.x-experience .strip-num{color:var(--x-accent)}.x-experience .section-heading h2{font-family:'Instrument Sans',system-ui,sans-serif;font-weight:500;letter-spacing:-.04em}.x-experience .continue-card{border-radius:3px;box-shadow:none;background:var(--x-panel)!important;min-height:145px}.x-experience .continue-card:after{display:none}.x-experience .continue-card:hover{transform:translateY(-3px);border-color:var(--x-accent)}.x-experience .continue-art{border-radius:0;background:var(--x-raised)}.x-experience .continue-card strong{font-family:'Instrument Sans',system-ui,sans-serif;font-size:25px;letter-spacing:-.035em}.x-experience .continue-card em{color:var(--x-muted)}.x-experience .filter-row{border-radius:0;background:var(--x-bg)!important;border-bottom:1px solid var(--x-line);padding-block:12px}.x-experience .filter-chip{border-radius:3px}.x-experience .filter-chip.active{background:var(--x-accent);color:var(--x-onaccent)}.x-experience .tool-deck{gap:0;border-left:1px solid var(--x-line);border-top:1px solid var(--x-line)}.x-experience .launch-card{min-height:235px;border:0;border-right:1px solid var(--x-line);border-bottom:1px solid var(--x-line);border-radius:0;background:transparent!important;padding:25px;box-shadow:none!important;transform:none!important}.x-experience .launch-card:hover{background:color-mix(in srgb,var(--x-accent) 4%,var(--x-bg))!important}.x-experience .launch-card h4{font-size:24px;font-family:'Instrument Sans',system-ui,sans-serif;letter-spacing:-.03em;font-weight:500}.x-experience .launch-card p{color:var(--x-muted);font-size:13px}.x-experience .card-icon{border-radius:3px;color:var(--x-accent)!important;border-color:var(--x-line)!important;background:var(--x-panel)!important}.x-experience .card-tag{font-size:8px;color:var(--x-muted)}.x-experience .card-open{border-top:1px solid var(--x-line);border-radius:0;background:none;color:var(--x-ink);padding-top:15px}.x-experience .card-open span{color:var(--x-accent);transition:transform .25s}.x-experience .launch-card:hover .card-open span{transform:translate(3px,-3px)}.x-experience .quick-card{border-radius:3px;background:var(--x-panel);border-color:var(--x-line);box-shadow:none}.x-experience .demo-footer{background:var(--x-bg);border-color:var(--x-line)}.x-experience .apptick{background:var(--x-panel);border-color:var(--x-line)}.x-experience .apptick-track span{color:var(--x-muted)}
.x-experience .askrow .input,.x-experience .twoup{min-width:0}.x-experience .twoup .input{width:0;min-width:0}
/* Gate: a large typographic introduction beside a focused form. */
.x-experience .account-gate{--g:var(--x-accent);--line:var(--x-line);background:var(--x-bg);padding:0;align-items:stretch}.x-experience .account-gate:before{background:radial-gradient(ellipse at 10% 75%,color-mix(in srgb,var(--x-accent) 7%,transparent),transparent 60%)}.x-experience .gate-stars{display:none}.x-experience .gate-shell{width:100%;max-width:1600px;min-height:100dvh;border:0;border-radius:0;background:transparent;box-shadow:none;grid-template-columns:1.1fr .9fr}.x-experience .gate-story{padding:40px 6vw 28px;background:transparent}.x-experience .gate-story:after{width:600px;height:600px;border-radius:0;transform:rotate(45deg);box-shadow:0 0 0 65px color-mix(in srgb,var(--x-accent) 2%,transparent);border-color:var(--x-line)}.x-experience .gate-story-copy{margin:75px 0 40px}.x-experience .gate-story-copy h2{font-family:'Instrument Sans',system-ui,sans-serif;font-size:clamp(45px,5.5vw,80px);line-height:1.02;letter-spacing:-.06em}.x-experience .gate-story-copy h2 em{font-family:'Instrument Serif',Georgia,serif}.x-experience .gate-story-copy>p:last-child{color:var(--x-muted)}.x-experience .gate-preview{width:100%;height:210px;max-width:390px;border-radius:0;transform:none;animation:none;background:var(--x-panel);box-shadow:none}.x-experience .gate-preview-mark{width:82px;height:64px;margin-bottom:15px}.x-experience .gate-window-top{border-color:var(--x-line)}.x-experience .gate-preview-body{padding:22px}.x-experience .gate-preview-cards{display:none}.x-experience .gate-preview-line{background:var(--x-line)}.x-experience .gate-float{border-radius:0;border-color:var(--x-line);background:var(--x-raised);color:var(--x-muted);box-shadow:none}.x-experience .gate-float-a{right:-12px}.x-experience .gate-float-b{left:auto;right:16px;bottom:20px}.x-experience .gate-story-foot{color:var(--x-muted)}.x-experience .account-card{max-width:420px;width:calc(100% - 70px)}.x-experience .account-heading h1{font:500 48px/1.04 'Instrument Sans',system-ui,sans-serif;letter-spacing:-.06em}.x-experience .account-heading p,.x-experience .pane-note{color:var(--x-muted)}.x-experience .account-tabs{background:transparent;border:0;border-bottom:1px solid var(--x-line);border-radius:0;gap:0;padding:0}.x-experience .account-tab{border:0;border-bottom:2px solid transparent;border-radius:0;padding:14px 8px;color:var(--x-muted);background:transparent;box-shadow:none}.x-experience .account-tab.active{color:var(--x-accent);border-bottom-color:var(--x-accent);background:transparent;box-shadow:none}.x-experience .account-form label{color:var(--x-ink)}.x-experience .account-form label span{color:var(--x-muted)}.x-experience .account-form input,.x-experience .account-form textarea{border-radius:3px;background:var(--x-panel);border-color:var(--x-line);color:var(--x-ink);padding:14px;font-size:15px}.x-experience .account-form input::placeholder,.x-experience .account-form textarea::placeholder{color:var(--x-muted);opacity:.8}.x-experience .account-form input:focus,.x-experience .account-form textarea:focus{box-shadow:0 0 0 3px color-mix(in srgb,var(--x-accent) 10%,transparent)}.x-experience .account-form button{border-radius:3px;background:var(--x-accent);color:var(--x-onaccent);border-color:var(--x-accent);padding:15px}.x-experience .account-form button:hover{background:color-mix(in srgb,var(--x-accent) 90%,white);box-shadow:none}.x-experience .account-foot a,.x-experience .account-step{color:var(--x-muted)}.x-experience .account-message{border-radius:3px;background:var(--x-panel)}.x-experience .account-message.success{color:var(--x-accent);border-color:var(--x-accent)}.x-experience .verification-mark{background:var(--x-panel);border-color:var(--x-line);color:var(--x-accent)}
/* Shared game and study chrome. Never change the dimensions of timing bars or boards. */
.x-experience :is(.arcade-header,.school-header,.owner-nav),.x-tool>header{background:color-mix(in srgb,var(--x-bg) 94%,transparent);border-color:var(--x-line);backdrop-filter:blur(12px);padding-block:18px}.x-experience .game-tool-btn{border-radius:3px;background:var(--x-panel);color:var(--x-muted);border-color:var(--x-line)}.x-experience :is(.arcade-hero,.school-hero){padding-top:48px;padding-bottom:25px}.x-experience :is(.arcade-hero,.school-hero) h1,.x-tool>main>h1{font:500 clamp(36px,5vw,66px)/1.05 'Instrument Sans',system-ui,sans-serif;letter-spacing:-.055em}.x-experience :is(.arcade-hero,.school-hero) h1 em,.x-tool>main>h1 em{font-family:'Instrument Serif',Georgia,serif;color:var(--x-accent)}.x-experience :is(.arcade-hero,.school-hero)>p{color:var(--x-muted)}.x-experience :is(.card,.calc,.game-guide,.school .card,.quick-card),.x-tool :is(.workspace>aside,.workspace>section>article,.skill-picker){background:var(--x-panel);border-color:var(--x-line);border-radius:4px;box-shadow:none}.x-experience .game-number{color:var(--x-line)}.x-experience :is(.topbar,.game-meta-row,.game-session-bar){border-color:var(--x-line);color:var(--x-muted)}.x-experience :is(.mode,.pill,.btn,.game-tool-btn,.owner-tab){border-radius:3px}.x-experience :is(input:not([type=range]):not([type=checkbox]),select,textarea){background-color:var(--x-bg);border-color:var(--x-line);color:var(--x-ink)}.x-experience :is(.btn.primary,.mode.active,.mode.on,.pill.active,.pill.on){background:var(--x-accent);color:var(--x-onaccent);border-color:var(--x-accent)}.x-experience .game-guide{color:var(--x-ink)}.x-experience .guide-list li{border-color:var(--x-line);background:var(--x-bg)}.x-experience .guide-list b{color:var(--x-accent)}.x-experience .game-session-bar{background:var(--x-bg);position:static}.x-experience .guide-head{color:var(--x-muted)}
.x-tool{background:var(--x-bg)!important}.x-tool main{max-width:1400px;padding-top:45px}.x-tool .workspace{gap:25px}.x-tool #unitsNav{border-block:1px solid var(--x-line);padding:16px 0;gap:8px}.x-tool :is(nav button,#lessons button){background:var(--x-panel);border-color:var(--x-line);color:var(--x-muted);border-radius:3px;font-size:13px}.x-tool :is(nav button[aria-pressed=true],nav button.active,#lessons button.active){background:var(--x-accent);color:var(--x-onaccent);border-color:var(--x-accent)}.x-tool :is(.card,aside>details,.start-guide,.first-note,.learning-grid section,.lesson-goal,.fact,.anatomy,.editor-head,fieldset){background:var(--x-panel);border-color:var(--x-line);border-radius:4px}.x-tool :is(.start-guide>div,.lesson-goal,.learning-grid section,.fact,.worked-note){background:var(--x-raised);color:var(--x-ink)}.x-tool :is(.intro,aside p,.first-note p,.anatomy p,.learning-grid dd,.start-guide small){color:var(--x-muted)}.x-tool h2{font-family:'Instrument Sans',system-ui,sans-serif;font-weight:500;letter-spacing:-.025em}.x-tool #code,.x-tool .anatomy pre{background:var(--x-bg);color:var(--x-ink)}.x-tool button.primary,.x-tool #run,.x-tool #next{background:var(--x-accent);color:var(--x-onaccent)}
.x-experience .owner-main{padding-top:55px}.x-experience .owner-main h1{font-family:'Instrument Sans',system-ui,sans-serif;letter-spacing:-.055em;font-weight:500}.x-experience .owner-tabs{border-radius:3px;background:var(--x-panel);border-color:var(--x-line);padding:4px}.x-experience .owner-tab.active{background:var(--x-accent);color:var(--x-onaccent)}.x-experience .owner-main .list{border-radius:4px;background:var(--x-panel);border-color:var(--x-line)}.x-experience .owner-main .stat{border-radius:3px;background:var(--x-panel);border-color:var(--x-line)}.x-experience .owner-main .stat strong{font-family:'Instrument Sans',system-ui,sans-serif}.x-experience .owner-main .status:before{background:var(--x-accent)}.x-experience .owner-main :is(.request,.session,.user-row){border-color:var(--x-line)}.x-experience .owner-main .row-title{color:var(--x-ink)}.x-experience .owner-main button:not(.secondary):not(.danger):not(.owner-tab){background:var(--x-accent);color:var(--x-onaccent);border-color:var(--x-accent);border-radius:3px}.x-experience .owner-nav .button{border-radius:3px;background:var(--x-panel);border-color:var(--x-line);color:var(--x-ink)}
html[data-aa-theme="crimson"] .demo-shell:after{background-image:repeating-linear-gradient(46deg,transparent 0 122px,#ffffff0b 122px 133px,transparent 133px 250px),repeating-linear-gradient(-46deg,transparent 0 122px,#ffffff0a 122px 133px,transparent 133px 250px)}
@media(max-width:1000px){.x-experience .demo-nav{flex-wrap:wrap;gap:14px}.x-experience .app-user{flex-wrap:wrap}.x-experience .demo-navlinks{margin-left:auto}.x-experience .app-user{margin-left:auto}.x-experience .demo-hero{grid-template-columns:1fr .55fr}.x-experience .hero-orbit{transform:scale(.8)}.x-experience .gate-story{padding-inline:35px}.x-experience .gate-story-copy h2{font-size:54px}.x-experience .gate-float-a{right:0}}
@media(max-width:860px){.x-experience .gate-shell{display:block}.x-experience .gate-story{display:none}.x-experience .account-card{width:calc(100% - 40px);padding-block:35px}.x-experience .account-mobile-brand{margin-bottom:40px}.x-experience .account-heading h1{font-size:42px}.x-experience .account-mobile-brand span{color:var(--x-accent)}}
@media(max-width:650px){.x-experience .demo-nav{position:relative;padding:16px 20px;gap:10px}.x-experience .demo-navlinks{order:3;width:100%;justify-content:center;border-top:1px solid var(--x-line);padding-top:8px}.x-experience .app-user{max-width:100%;gap:6px}.x-experience #accountName{max-width:10ch}.x-experience .demo-main{padding-inline:20px}.x-experience .demo-hero{grid-template-columns:1fr;padding-block:35px;gap:0}.x-experience .hero-orbit{display:none}.x-experience .hero-copy h1{font-size:43px}.x-experience .hero-search{margin-top:23px}.x-experience .workspace-strip{grid-template-columns:1fr 1fr}.x-experience .tool-deck{grid-template-columns:1fr}.x-experience .launch-card{min-height:205px;padding:22px}.x-experience .continue-card strong{font-size:22px}.x-experience .continue-card{padding:20px}.x-experience .arcade-hero,.x-experience .school-hero{padding-top:30px}.x-experience .school .game{width:calc(100% - 36px)}.x-tool main{padding:26px 18px}.x-tool #unitsNav button{flex:1 1 130px}.x-experience .game-nav-center{display:none}.x-experience .game-header-actions{gap:4px}.x-experience .game-tool-btn{font-size:9px;padding-inline:8px}.x-experience .owner-nav{flex-wrap:wrap;gap:10px}.x-footer{font-size:8px;padding-inline:20px}.x-footer button{font-size:9px}}
.academic-use-notice{position:relative;margin:18px 0 24px;padding:0;border:1px solid color-mix(in srgb,var(--mint,#43dba1),transparent 70%);border-radius:12px;background:linear-gradient(120deg,color-mix(in srgb,var(--mint,#43dba1),transparent 93%),rgba(255,255,255,.018));color:var(--ink,#eef4f0);box-shadow:0 16px 45px rgba(0,0,0,.12)}.academic-use-notice summary{display:flex;align-items:center;gap:10px;padding:13px 15px;cursor:pointer;list-style:none}.academic-use-notice summary::-webkit-details-marker{display:none}.academic-use-notice summary>span{color:var(--mint,#43dba1);font-size:17px}.academic-use-notice summary strong{font-size:12px;letter-spacing:.02em}.academic-use-notice summary small{margin-left:auto;color:var(--muted,#89958e);font:9px ui-monospace,monospace;text-transform:uppercase;letter-spacing:.1em}.academic-use-notice[open] summary{border-bottom:1px solid rgba(225,255,237,.08)}.academic-use-notice p{margin:0;padding:13px 15px;color:var(--muted,#89958e);font-size:11px;line-height:1.6}.school-use-summary{display:flex;gap:13px;align-items:flex-start;margin:15px 0 22px;padding:15px 17px;border:1px solid rgba(var(--mint-rgb,67,219,161),.2);border-radius:12px;background:linear-gradient(100deg,rgba(var(--mint-rgb,67,219,161),.07),rgba(255,255,255,.012))}.school-use-summary>span{color:var(--mint,#43dba1);font-size:19px}.school-use-summary strong{font-size:12px}.school-use-summary p{margin:5px 0 0;color:var(--muted,#89958e);font-size:10px;line-height:1.55}@media(max-width:620px){.academic-use-notice{margin:12px 0 18px}.academic-use-notice p{font-size:10px}.school-use-summary{padding:13px}}