:root{color-scheme:dark;font-family:Inter,system-ui,sans-serif;background:#080d15;color:#eef3f7}*{box-sizing:border-box}body{margin:0}body>header{position:relative;z-index:10;background:#080d15;height:72px;display:flex;align-items:center;gap:24px;padding:0 28px;border-bottom:1px solid #25323e}body>header a{color:#bfe8fb;letter-spacing:.14em;font-size:12px;text-decoration:none;font-weight:700}body>header>span{color:#9cabbb}button,textarea,select{font:inherit;color:inherit;border:1px solid #334452;background:#101b26;border-radius:8px}button{padding:11px 17px;cursor:pointer}button:hover{border-color:#a4d7ee}button:disabled{opacity:.4;cursor:default}textarea{width:100%;padding:18px;resize:vertical;line-height:1.6}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid #bfe8fb;outline-offset:4px}#tools{margin-left:auto;position:relative;font-size:14px}summary{cursor:pointer}#tools>div{position:absolute;right:0;top:28px;z-index:4;width:220px;padding:10px;background:#101b26;border:1px solid #334452;border-radius:10px;display:grid;gap:7px}#question-entry{max-width:680px;margin:15vh auto 0;padding:24px}h1{font-size:clamp(28px,4vw,42px);font-weight:500;letter-spacing:-.04em}.entry-actions{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-top:16px}#start,#use-import{background:#c2e6f8;color:#101722}.attach{cursor:pointer;font-size:14px;color:#bfe8fb}.attach input{display:block;max-width:220px;font-size:11px;margin-top:8px}.quiet{margin-top:24px;border:0;background:none;padding:0;color:#9eb4c4;font-size:13px}#imported{margin-top:20px}#imported textarea{margin:12px 0}.subject{display:flex;justify-content:space-between;gap:24px;padding:24px 32px}.subject p{margin:0;font-size:19px;max-width:900px;line-height:1.5}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 380px;min-height:calc(100dvh - 175px)}#visual{position:relative;min-height:460px;display:grid;align-items:center}#equation-art{height:clamp(340px,65vh,760px);width:100%;visibility:hidden}#equation-art.ready{visibility:visible}#equation-art iframe{border:0;width:100%;height:100%}#equation-empty{position:absolute;inset:40% 10% auto;text-align:center;color:#7f95a5}#equation-status{position:absolute;bottom:45px;left:25px;font-size:13px;color:#abc5d5}#equation-navigation{position:absolute;bottom:12px;left:50%;transform:translateX(-50%);white-space:nowrap}#position{padding:0 18px;color:#9eb4c4}#adam-ai{border-left:1px solid #25323e;padding:18px 20px;max-height:calc(100dvh - 175px);overflow:auto}#status{margin:16px 32px;color:#bfe8fb}#print-notes{display:none}[hidden]{display:none!important}@media(max-width:850px){.workspace{grid-template-columns:1fr}#visual{min-height:270px}#equation-art{height:300px}#adam-ai{border-left:0;border-top:1px solid #25323e;max-height:none}.subject{padding:20px}.subject p{font-size:17px}body>header{padding:0 18px;gap:15px}#question-entry{margin-top:8vh}}@media print{body{background:white;color:black}body>header,main>section,#status{display:none!important}#print-notes{display:block;font:12pt/1.5 Georgia,serif}#print-notes svg{max-width:100%;height:auto;max-height:100px}#print-notes section{break-inside:avoid}#print-notes h1{font-size:24pt}}

#world-diagram{position:absolute;inset:0 0 55px}#world-diagram iframe{width:100%;height:100%;border:0}#account-controls [data-sfi-account-control="chat"]{display:none}#account-controls{display:flex;justify-content:center}

#teaching-visual-stage{position:absolute;inset:0 0 55px}#teaching-visual-panel{grid-column:2}

#status a{color:#bfe8fb}#status input{display:block;max-width:100%;width:600px;margin-top:8px;padding:10px;color:inherit;background:#101b26;border:1px solid #334452}

#adam-ai{grid-column:2;grid-row:1 / span 2}#teaching-visual-panel{grid-column:1;grid-row:2;min-height:340px}@media(max-width:850px){#adam-ai{grid-column:1;grid-row:3}}

/* Two mathematical sections, with the existing AdamAI conversation beside them. */
.workspace{grid-template-columns:minmax(0,1.25fr) minmax(0,1fr) 450px;gap:0;min-height:calc(100dvh - 175px)}
#visual-display,#equations-pane{min-width:0;position:relative;display:flex;flex-direction:column;border-right:1px solid #25323e}
.pane-heading{height:56px;flex:none;display:flex;align-items:center;gap:12px;padding:12px 20px;border-bottom:1px solid #1b2935}
.pane-heading h2{font-size:14px;letter-spacing:.02em;font-weight:500;margin:0}.pane-heading>span{color:#8ba3b5;font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
#equation-view{margin-left:auto;display:flex;gap:3px}#equation-view button{font-size:12px;padding:6px 10px;background:transparent;border-color:transparent}#equation-view [aria-pressed=true]{background:#192b39;border-color:#42647a;color:#d9f1ff}
#visual-content{position:relative;min-height:420px;flex:1}#world-diagram,#teaching-visual-stage,#teaching-visual-panel{position:absolute;inset:0;min-height:0}#teaching-visual-stage iframe,#teaching-visual-panel iframe{width:100%;height:100%;border:0}
#visual-empty{position:absolute;inset:40% 12% auto;text-align:center;color:#8299aa;font-size:14px;line-height:1.6}
#equation-content{position:relative;min-height:420px;flex:1}#equation-art{height:100%;min-height:420px;position:absolute;inset:0}#equation-list{padding:18px 12px;max-height:calc(100dvh - 300px);min-height:420px;overflow:auto;scrollbar-width:thin}
.equation-step{display:flex;align-items:center;gap:14px;width:100%;min-height:65px;text-align:left;padding:15px 12px;margin:0 0 6px;border:1px solid transparent;border-radius:8px;background:transparent;color:#c9dce9}
.equation-step[aria-current=true]{border-color:#456c86;background:#112433;color:#effaff}.equation-step .step-number{font-size:11px;color:#8198a9;width:18px;flex:none;font-variant-numeric:tabular-nums}.equation-step>div{min-width:0;flex:1}.equation-step svg{display:block;max-width:100%;width:auto;height:auto;max-height:70px;font-size:24px}
#equation-navigation{position:static;transform:none;text-align:center;padding:12px;flex:none;border-top:1px solid #1b2935}#equation-navigation button{padding:6px 12px}#equation-empty{inset:40% 10% auto;font-size:14px}#equation-status{bottom:10px;left:16px;right:16px}
#adam-ai{grid-column:3;grid-row:1;max-height:calc(100dvh - 175px);border-left:0;padding:18px 16px}
@media(max-width:1100px){.workspace{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}#adam-ai{grid-column:1 / -1;grid-row:2;max-height:none;border-top:1px solid #25323e}#visual-content,#equation-content,#equation-art{min-height:380px}#equation-list{max-height:480px;min-height:380px}}
@media(max-width:650px){.workspace{grid-template-columns:minmax(0,1fr)}#visual-display{grid-column:1;grid-row:1;border-bottom:1px solid #25323e}#equations-pane{grid-column:1;grid-row:2}#adam-ai{grid-column:1;grid-row:3}#visual-content{height:290px;min-height:290px;flex:none}#equation-content,#equation-art{min-height:300px}#equation-list{min-height:180px;max-height:460px}.pane-heading{height:48px;padding:10px 18px}.equation-step{min-height:58px}#visual-empty{inset:35% 12% auto}.subject{padding:16px}.subject p{font-size:16px}}

.equation-step{font-size:28px}.equation-step svg{font-size:inherit;max-height:none}.equation-step>div{overflow:hidden}@media(max-width:650px){.equation-step{font-size:25px}}

.equation-step{font-size:var(--equation-size,28px)!important;min-width:var(--equation-row-width,0px)}.equation-step svg{max-width:none}.equation-step>div{overflow:visible}

/* Both presentations use the canonical Laser canvas. Long derivations scroll. */
#equation-art{overflow:auto;scrollbar-width:thin;min-height:0}#equation-art iframe{display:block;border:0;max-width:none}#equation-list{display:none!important}#equation-content{min-height:calc(100dvh - 290px)}
@media(max-width:1100px){#equation-content{min-height:480px}}
@media(max-width:650px){#equation-content{min-height:440px}}

/* Only reserve space for mathematics that is actually being demonstrated. */
.entry-description{color:#b6c9d7;line-height:1.65;max-width:620px}.entry-distinction{color:#8ba3b5;font-size:13px;line-height:1.6;max-width:620px;margin-top:28px}
.entry-actions{flex-wrap:wrap}.explanation-context{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:0 24px 12px}.explanation-context:not(:has(button:not([hidden]))){display:none}
.workspace [hidden]{display:none!important}
.workspace[data-layout="single"]{grid-template-columns:minmax(0,1fr) 450px}
.workspace[data-layout="single"] #adam-ai{grid-column:2;grid-row:1}
.workspace[data-layout="conversation"]{grid-template-columns:minmax(0,760px);justify-content:center}
.workspace[data-layout="conversation"] #adam-ai{grid-column:1;grid-row:1;max-height:none}
@media(max-width:1100px){.workspace[data-layout="single"]{grid-template-columns:minmax(0,1fr)}.workspace[data-layout="single"] #adam-ai{grid-column:1;grid-row:2}}
@media(max-width:650px){.workspace[data-layout="single"] #visual-display,.workspace[data-layout="single"] #equations-pane{grid-row:1}.entry-actions{gap:10px}.explanation-context{padding:0 16px 12px}}

.attach{position:relative;display:inline-flex;align-items:center;min-height:42px;padding:10px 14px;border:1px solid #334452;border-radius:8px;background:#101b26}.attach input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}.attach:focus-within{outline:2px solid #bfe8fb;outline-offset:3px}

@media(min-width:1101px){#conversation:has(#return-homework:not([hidden])) .workspace{min-height:calc(100dvh - 230px)}#conversation:has(#return-homework:not([hidden])) #equation-content{min-height:calc(100dvh - 345px)}}

/* Homework starts with voice; the canonical transcript is optional. */



#question-entry .entry-actions{justify-content:flex-start}
#imported{font-size:14px;color:#b6c9d7}#imported[open]{margin-bottom:24px}
@media(max-width:1100px){#adam-ai,.workspace[data-layout="single"] #adam-ai{grid-row:1;border-top:0;border-bottom:1px solid #25323e}#visual-display,#equations-pane{grid-row:2}}
@media(max-width:650px){#visual-display,.workspace[data-layout="single"] #visual-display{grid-row:2}#equations-pane{grid-row:3}.workspace[data-layout="single"] #equations-pane{grid-row:2}}
#question-blocks{display:grid;grid-template-columns:repeat(auto-fit,minmax(72px,1fr));gap:7px;padding:18px 24px 8px}#question-blocks button{min-height:58px;padding:8px 5px;font-size:18px}#question-blocks button small{display:block;font-size:10px;margin-top:4px;color:#a8bfce}#question-blocks button[aria-pressed="true"]{border-color:#bfe8fb;background:#193344}.worksheet-progress{display:flex;align-items:center;gap:12px;padding:0 24px;color:#a8bfce;font-size:12px}.worksheet-progress button{padding:4px 8px;font-size:12px}#question-choice{display:none}.pane-heading #equation-view{display:flex;gap:4px;flex-wrap:wrap}#equation-view button{padding:6px 8px;font-size:12px}
#graph-description{font-size:12px;line-height:1.5;color:#a8bfce;margin:10px 18px 16px;max-width:65ch}#graph-description:empty{display:none}

/* Native AdamAI owns its controls and typography; homework owns only the rail. */
.workspace{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr) 450px;min-height:560px;height:calc(100dvh - 250px)}
#adam-ai{padding:18px 20px;max-height:none;overflow:auto;align-self:stretch}
#adam-ai>h2{font:500 14px system-ui;margin:0 0 18px;color:#d7e4ed}
#visual-content,#equation-content{min-height:0}#equation-art{overflow-y:auto;overflow-x:hidden;min-height:0}#equation-art iframe{max-width:100%}
#question-blocks{grid-template-columns:repeat(auto-fit,minmax(52px,1fr));gap:6px;padding-top:14px}#question-blocks button{min-height:48px;font-size:16px}#question-blocks button small{font-size:9px}.subject{padding:14px 24px}.subject p{font-size:16px}#graph-description{display:none}
@media(max-width:1100px){.workspace{height:auto;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr)}#adam-ai{grid-row:1;grid-column:1/-1}#visual-display,#equations-pane{height:560px;grid-row:2}}
@media(max-width:650px){.workspace{grid-template-columns:minmax(0,1fr)}#visual-display{height:340px;grid-row:2}#equations-pane{height:540px;grid-row:3}.pane-heading{height:auto;min-height:54px}}
/* Full solutions preserve native Laser pixels; display scaling happens afterward. */
#equation-art[data-view="list"] iframe{position:absolute;max-width:none;pointer-events:none}
.native-solution-sheet{position:relative;width:100%;padding:14px 12px;background:#070b10}
.native-solution-sheet section{padding:8px 0 18px;border-bottom:1px solid #25323e}
.native-solution-sheet small{display:block;padding:0 8px;color:#a8bfce;font-size:12px}
.native-solution-sheet img{display:block;max-width:none;height:auto;margin:0 auto}
/* Assignment cards and a consistent teaching workspace. */
#question-blocks{display:grid;grid-template-columns:none;grid-auto-flow:column;grid-auto-columns:minmax(250px,1fr);gap:12px;padding:18px 20px 12px;overflow-x:auto;scrollbar-width:thin}
#question-blocks .question-card{display:flex;flex-direction:column;align-items:stretch;gap:9px;min-height:150px;padding:15px 17px;text-align:left;border:1px solid #293c4b;border-radius:12px;background:#0d1721}
#question-blocks .question-card[aria-pressed=true]{background:#132737;border-color:#a4d7ee;box-shadow:inset 0 0 0 1px #a4d7ee}
.question-number{font-size:11px;color:#a8bfce;letter-spacing:.04em}.question-task{font-size:14px;line-height:1.4;color:#eef3f7}
.question-math{display:flex;align-items:center;min-height:48px;overflow:auto;font-size:13px;line-height:1.5}.question-math svg{display:block;width:auto;height:44px;max-width:100%;color:#eef7ff;flex:none}
#question-blocks .question-status{font-size:10px;color:#9eb4c4;margin-top:auto}
.subject{padding:12px 20px 16px;align-items:center}.subject p{font-size:16px;font-weight:500}.subject button{padding:7px 12px;font-size:12px;flex:none}
.workspace{gap:12px;padding:0 20px 0;height:calc(100dvh - 320px);min-height:500px;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) 434px}
.workspace[data-layout=single]{grid-template-columns:minmax(0,1fr) 434px}
#visual-display,#equations-pane{border:1px solid #253847;border-bottom:0;border-radius:12px 12px 0 0;background:#080e16;overflow:hidden}
#visual-display{grid-column:1}#equations-pane{grid-column:2}.workspace[data-layout=single] #equations-pane{grid-column:1}
#adam-ai{padding:0 12px;overflow:auto;border:0}
.pane-heading{min-height:62px;height:auto;padding:12px 16px;gap:10px;border-bottom:1px solid #253847}
.pane-heading h2{font-size:13px;color:#cadce8}
#equation-view{gap:6px}.pane-heading #equation-view button{padding:8px 11px;font-size:12px;border:1px solid #334a5b;border-radius:7px;background:#111f2b;color:#bdd0df}
.pane-heading #equation-view button[aria-pressed=true]{background:#c2e6f8;border-color:#c2e6f8;color:#0b1c28;font-weight:600}
#show-all[aria-busy=true]::after{content:' …'}
#equation-navigation{display:flex;justify-content:center;align-items:center;gap:6px;height:44px;padding:4px 12px;background:#0c1721;border-top:1px solid #253847}
#equation-navigation button{display:grid;place-items:center;width:32px;height:32px;padding:0;border:1px solid #365064;border-radius:7px;background:#142433;font-size:26px;line-height:1}
#position{padding:0 10px;min-width:75px;font-size:12px;font-variant-numeric:tabular-nums}
#equation-navigation button:disabled{opacity:.3}
@media(max-width:1100px){.workspace,.workspace[data-layout=single]{height:auto;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}#adam-ai,.workspace[data-layout=single] #adam-ai{grid-column:1/-1;grid-row:1;padding:0 0 12px}#visual-display{grid-column:1;grid-row:2}#equations-pane{grid-column:2;grid-row:2}.workspace[data-layout=single] #equations-pane{grid-column:1/-1;grid-row:2}}
@media(max-width:650px){#question-blocks{grid-auto-columns:85%;padding:14px 12px}.subject{padding:12px}.workspace,.workspace[data-layout=single]{padding:0 12px;grid-template-columns:minmax(0,1fr)}#visual-display{grid-column:1;grid-row:2}#equations-pane{grid-column:1;grid-row:3}.workspace[data-layout=single] #equations-pane{grid-row:2}}
#equation-navigation{position:absolute;right:10px;bottom:8px;left:auto;width:max-content;height:36px;padding:2px 4px;gap:2px;border:1px solid #2b4254;border-radius:9px;background:#0c1721;z-index:2}
#equation-navigation button{width:28px;height:28px;border:0;background:transparent;font-size:24px}
#position{min-width:54px;padding:0 5px;font-size:11px}
#pdf-notes{margin-left:auto;padding:9px 13px;font-size:12px;background:#142635;border-color:#3e6079}
body>header #tools{margin-left:0}
@media(max-width:650px){body>header{gap:10px;padding:0 12px}body>header>span{display:none}#pdf-notes{font-size:11px;padding:8px}}
/* The assignment wraps; the page and its panels never scroll sideways. */
.native-equation-viewport{position:absolute;inset:0;overflow:clip;min-width:0}
#equation-art[data-view="list"] .native-equation-viewport{pointer-events:none}
#question-blocks{grid-auto-flow:row;grid-auto-columns:auto;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));overflow-x:hidden}
#question-blocks .question-card{min-width:0}.question-math{overflow:hidden;min-width:0}.question-math svg{width:100%;height:auto;max-height:60px;min-width:0}
.question-task,.question-math,.subject p{overflow-wrap:anywhere}
.native-solution-sheet{max-width:100%;overflow:hidden}.native-solution-sheet img{max-width:100%;height:auto!important}
body,main,#conversation{max-width:100%;min-width:0}#adam-ai{min-width:0;overflow-x:hidden}
@media(max-width:650px){#question-blocks{grid-template-columns:minmax(0,1fr);grid-auto-columns:auto}}
@media(max-width:650px){body>header{height:auto;min-height:72px;flex-wrap:wrap;padding-block:12px}#tools{font-size:12px}.subject{flex-wrap:wrap}.pane-heading{flex-wrap:wrap}#equation-view{margin-left:0}}

/* Fixed card proportions and consistent native equation sizing. */
#question-blocks{grid-template-columns:repeat(auto-fill,minmax(0,320px));justify-content:start;gap:12px;padding-bottom:20px}
#question-blocks .question-card{aspect-ratio:16/9;min-height:180px;gap:8px;padding:14px 16px}
.question-task{font-size:13px;line-height:1.35}
.question-math{height:60px;min-height:60px;justify-content:flex-start}
.question-math svg{width:auto;height:auto;max-width:100%;max-height:60px;flex-shrink:1;font-size:26px}
#toggle-visual{margin-left:auto;font-size:11px;padding:6px 8px;flex:none}
#restore-visual{font-size:11px;padding:6px 8px}
.native-solution-sheet section{padding:14px 0 26px}
.native-solution-sheet img{margin-left:8px;margin-right:0}
@media(max-width:650px){#question-blocks{grid-template-columns:minmax(0,320px)}.workspace{padding-top:0}}
/* Homepage World planes and stars retain their canonical gradient recipes. */
#question-blocks{max-height:402px;overflow-y:auto;overflow-x:hidden;scrollbar-width:thin;scrollbar-color:#456477 transparent;align-content:start}
#question-blocks .question-card{position:relative;isolation:isolate;overflow:hidden;background:transparent;border-color:#526e80}
#question-blocks .question-card[aria-pressed=true]{background:transparent;border-color:#bfe9fb;box-shadow:inset 0 0 0 1px #bfe9fb,0 0 22px #69d5ff18}
.question-card>.question-atmosphere{position:absolute;inset:0;width:100%;height:100%;min-height:0;z-index:-1;border-radius:inherit;--world-accent:#bfe9fb;opacity:1;transition:none}
.question-card:nth-child(3n+2)>.question-atmosphere{--world-accent:#c9b7ff}
.question-card:nth-child(3n)>.question-atmosphere{--world-accent:#f0bddf}
.question-card .sfi-parallax-world-plane{border:0;box-shadow:none;z-index:-3}
.question-card>.question-atmosphere::after{opacity:.65}
#question-blocks .is-preview{opacity:.8;cursor:default}.is-preview .question-math{color:#7998ab}
.question-number{color:#bfe9fb}.question-card:nth-child(3n+2) .question-number{color:#c9b7ff}.question-card:nth-child(3n) .question-number{color:#f0bddf}
.question-status{display:flex!important;align-items:center;gap:7px}
.question-card[data-preparing=true] .question-status::before{content:'';width:9px;height:9px;border:2px solid #456477;border-top-color:#bfe9fb;border-radius:50%;animation:preparing-turn 1s linear infinite}
@keyframes preparing-turn{to{transform:rotate(360deg)}}
@media(prefers-reduced-motion:reduce){.question-card[data-preparing=true] .question-status::before{animation:none}}
.assignment-heading{display:flex;align-items:center;gap:14px;padding:16px 20px 0;color:#c4d8e8;font-size:13px}.assignment-heading small{color:#8fadc0}.assignment-heading button{margin-left:auto;font-size:11px;padding:6px 9px}
body>header{height:auto;min-height:72px;flex-wrap:wrap;padding-block:12px;background:linear-gradient(155deg,#09141e,#03080e)}
#tools{display:flex;gap:7px;flex-wrap:wrap;align-items:center}#tools button{font-size:12px;padding:8px 11px}
#visual-display,#equations-pane{border:1px solid #253847;border-radius:14px;min-height:0}
.workspace{height:calc(100dvh - 520px);min-height:560px;padding-bottom:20px}
.pane-heading{flex-wrap:wrap;background:linear-gradient(135deg,#102331,#06121d)}
.pane-heading>button{font-size:11px;padding:6px 8px}
#equation-content{min-height:0}#equation-art{height:100%}
#session-share{width:min(650px,calc(100vw - 32px));padding:20px;border:1px solid #526e80;border-radius:14px;background:linear-gradient(155deg,#09141e,#03080e);color:#e7f2f8}
#session-share::backdrop{background:#010306bb}.share-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.share-heading h2{font-size:18px;font-weight:500;margin:0 0 18px}.share-heading button{padding:4px 10px;font-size:23px}
summary{list-style:none}summary::-webkit-details-marker{display:none}summary::marker{content:''}
@media(max-width:1100px){.workspace{height:auto}#equations-pane{height:560px}}
@media(max-width:650px){.assignment-heading{flex-wrap:wrap;padding-inline:12px}.assignment-heading small{font-size:10px}#question-blocks{max-height:390px}#tools{gap:4px}#tools button{font-size:11px}.workspace{padding-bottom:12px}#visual-display{height:340px}#equations-pane{height:540px}}
/* The assignment is one draggable shelf; the teaching stage fills the screen. */
html,body{height:100%;overflow:hidden}body{display:flex;flex-direction:column;height:100dvh}body>header{flex:none}
main#homework-app{flex:1;min-height:0;display:flex;flex-direction:column}
#conversation{display:flex;flex:1;flex-direction:column;min-height:0;overflow:hidden}
.assignment-heading{flex:none;padding-top:12px}
#question-blocks{display:flex;flex:none;gap:12px;height:163px;max-height:none;padding:12px 20px 16px;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;touch-action:pan-x;cursor:grab;scroll-snap-type:x proximity}
#question-blocks::-webkit-scrollbar{display:none}#question-blocks.is-dragging{cursor:grabbing;scroll-snap-type:none;user-select:none}
#question-blocks .question-card{flex:0 0 240px;width:240px;height:135px;min-height:135px;aspect-ratio:16/9;padding:10px 12px;gap:4px;scroll-snap-align:start}
.question-task{font-size:12px}.question-math{height:43px;min-height:43px}.question-math svg{max-height:43px}.question-number{font-size:10px}
.workspace{flex:1;min-height:0!important;height:auto!important;padding:0 20px 20px;overflow:hidden}
#visual-display,#equations-pane,#adam-ai{height:auto;min-height:0}
#equation-content,#visual-content{min-height:0!important}#equation-art{min-height:0!important}
.native-solution-sheet .answer-step{border:1px solid #526e80;border-radius:9px;padding:14px 0 22px;margin-block:8px;background:#bfe9fb04}
@media(max-width:1100px){.workspace{overflow-y:auto;align-content:start}#adam-ai{height:auto;max-height:340px}#visual-display{height:320px}#equations-pane{height:520px}}
@media(max-width:650px){#question-blocks{padding-inline:12px}.workspace{padding:0 12px 12px}.assignment-heading{padding-top:8px}}
/* Upper-bar dimensions and states follow the World learning-panel prototype. */
:root{--tutor-inset:16px;--tutor-gap:12px;--tutor-radius:19px}
body>header.sfi-world-global-controls{height:62px;min-height:62px;flex-wrap:nowrap;gap:6px;padding:0 var(--tutor-inset);background:#091019;border-bottom:1px solid #253847}
body>header .prototype-global-brand{flex:1 1 260px;min-width:180px;max-width:360px;margin:0 auto 0 0;padding:0;border:0;letter-spacing:.14em;font-size:12px}
.prototype-global-brand small{display:block;font:400 12px/1.5 system-ui;letter-spacing:.025em;color:#9db0bc;margin-top:3px}
#tools{display:contents}
body>header button,#tools button,#pdf-notes{flex:none;min-height:38px;margin:0;padding:8px 10px;border-radius:5px;font-size:11px;background:#101b26;border:1px solid #334452;white-space:nowrap}
body>header button[aria-expanded=true],body>header button:hover{border-color:#bfe8fb99;background:#bfe8fb15;color:#edfaff}
.workspace{order:0;gap:var(--tutor-gap);padding:var(--tutor-inset) var(--tutor-inset) 0}
#visual-display,#equations-pane{border-radius:var(--tutor-radius)}#adam-ai{padding:0;align-self:stretch;height:100%}
.assignment-heading{order:1;padding:10px var(--tutor-inset) 0;font-size:11px;color:#8fadc0}
.question-rail{order:2;position:relative;flex:none;min-width:0;padding:0 var(--tutor-inset) var(--tutor-inset)}
#question-blocks{height:147px;padding:12px 0 0;gap:var(--tutor-gap);scroll-padding-inline:0}
.question-rail .shelf-control{position:absolute;top:50%;transform:translateY(-50%);z-index:3;border-radius:999px;border:1px solid #bfe8fb66;background:linear-gradient(135deg,rgba(24,49,66,.98),rgba(7,18,28,.98));color:#edfaff;box-shadow:0 0 18px #69d5ff20;padding:10px 14px;font-size:11px;min-height:40px}
#questions-forward{right:24px}#questions-back{left:24px}.shelf-control:hover{border-color:#bfe9fb;box-shadow:0 0 24px #69d5ff40}
.worksheet-progress{flex:none}.worksheet-progress:has(#worksheet-status:empty){display:none}
#equation-navigation{right:12px;bottom:12px;height:40px;gap:5px;padding:4px;border:1px solid #bfe8fb44;border-radius:12px;background:linear-gradient(135deg,#102331,#06121d);box-shadow:0 0 18px #69d5ff12}
#equation-navigation button{width:auto;min-width:54px;height:30px;padding:5px 10px;font-size:11px;border:1px solid #bfe8fb44;border-radius:8px;background:linear-gradient(135deg,rgba(112,199,236,.26),rgba(191,232,251,.08));color:#dff6ff}
#equation-navigation button:hover:not(:disabled){background:#bfe8fb30;border-color:#bfe8fb;box-shadow:0 0 14px #69d5ff44}#equation-navigation button:active:not(:disabled){background:#bfe8fb50}#position{font-size:11px}
#equation-loading{position:absolute;inset:0;display:none;place-content:center;justify-items:center;gap:20px;pointer-events:none;color:#bfe9fb;font-size:11px;letter-spacing:.06em;z-index:3;background:#080d15d9}
#equation-content:has(#equation-status[data-phase=preparing]:not(:empty)) #equation-loading{display:grid}
#equation-status[data-phase=preparing]{clip-path:inset(50%);width:1px;height:1px;overflow:hidden}
.loading-orbit{position:relative;width:54px;height:54px;border:1px solid #bfe9fb30;border-radius:50%;box-shadow:0 0 26px #24d9ff18,inset 0 0 16px #24d9ff12}
.loading-orbit::before,.loading-orbit::after{content:'';position:absolute;inset:6px;border:1px solid transparent;border-top-color:#bfe9fb;border-right-color:#168cff;border-radius:50%;animation:preparing-turn 2.4s linear infinite}.loading-orbit::after{inset:17px;border-color:#38f6c4aa;animation:none;box-shadow:0 0 14px #38f6c455}
@keyframes tutor-loading-sweep{from{transform:translateX(0)}to{transform:translateX(150%)}}
@media(prefers-reduced-motion:reduce){#equation-loading *{animation:none!important}#equation-loading ::before{animation:none!important}}
#sessions-dialog{width:min(620px,calc(100vw - 32px));max-height:80dvh;padding:22px;border:1px solid #526e80;border-radius:19px;background:linear-gradient(155deg,#09141e,#03080e);color:#e7f2f8}#sessions-dialog::backdrop{background:#010306bb}#sessions-description{font-size:12px;color:#9db0bc;line-height:1.5}#session-list{display:grid;gap:9px;margin:18px 0}#session-list button{display:grid;gap:6px;text-align:left;padding:13px}#session-list span{font-size:11px;color:#8fadc0}#session-list strong{font-size:13px;font-weight:500}#session-account{font-size:12px}
@media(max-width:1199px){body>header.sfi-world-global-controls{height:auto;min-height:62px;flex-wrap:wrap;padding:8px 12px}body>header .prototype-global-brand{flex:1 1 100%;max-width:none}.workspace{overflow-y:auto}#adam-ai{height:auto;max-height:340px}}
@media(max-width:650px){:root{--tutor-inset:12px}.question-rail{padding-bottom:12px}#questions-forward{right:20px}#questions-back{left:20px}.workspace{padding-top:12px}}
#status:empty{display:none}
.question-task{height:32px;flex:none;overflow:hidden}.question-math{height:48px;min-height:48px}.question-math svg{max-height:48px}

/* Equation Studio owns the mathematical spacing; step labels remain tutor UI. */
.native-solution-sheet section,.native-solution-sheet .answer-step{padding-bottom:calc(14px + var(--equation-step-gap,26px))}
.workspace #equations-pane{grid-column:1;grid-row:1}
.workspace #visual-display{grid-column:2;grid-row:1}
.workspace[data-layout=single] #equations-pane{grid-column:1;grid-row:1}
@media(max-width:1100px){.workspace #equations-pane{grid-column:1;grid-row:2}.workspace #visual-display{grid-column:2;grid-row:2}.workspace[data-layout=single] #equations-pane{grid-column:1/-1;grid-row:2}}
@media(max-width:650px){.workspace #equations-pane{grid-column:1;grid-row:2}.workspace #visual-display{grid-column:1;grid-row:3}.workspace #adam-ai{grid-row:1}}

#equation-treatment{display:flex;flex:none;gap:6px;padding:8px 14px;border-bottom:1px solid #253847}
#equation-treatment button{padding:5px 10px;font-size:11px;border-radius:7px}
#equation-treatment button[aria-pressed=true]{background:#c2e6f8;border-color:#c2e6f8;color:#0b1c28}
#equation-art[data-treatment="7"] .native-solution-sheet{background:#fff;color:#111}
#equation-art[data-treatment="7"] .native-solution-sheet small{color:#35424a}
#equation-art[data-treatment="8"] .native-solution-sheet{background:#000}

#show-previous-equation{align-self:center;margin:0 0 0 auto;padding:5px 10px;font-size:11px;border-radius:7px}
#show-previous-equation[aria-pressed=true]{border-color:#bfe8fb;color:#e7f7ff;background:#bfe8fb18}
#equations-pane:has(#show-all[aria-pressed=true]) #show-previous-equation{display:none}
.previous-equation-card{position:absolute;top:12px;left:auto;right:12px;width:57%;max-width:390px;height:17%;min-height:80px;max-height:110px;border:1px solid #526e80;border-radius:12px;overflow:hidden;z-index:1;background:#080e16}
.previous-equation-card>small{display:block;height:20px;padding:4px 9px;font-size:9px;color:#a8bfce}
.previous-equation-art{position:absolute;inset:20px 0 0;overflow:hidden}
.previous-equation-art>.native-equation-viewport{inset:0}
.previous-equation-status{position:absolute;bottom:5px;left:12px;font-size:10px}
#equation-art.with-previous>.native-equation-viewport{inset:0}

/* Follow the canonical ink paper colors without altering equation materials. */
#equation-art[data-treatment="7"] .previous-equation-card{background:#fff;border-color:#b7bec4}
#equation-art[data-treatment="7"] .previous-equation-card>small,#equation-art[data-treatment="7"] .previous-equation-status{color:#35424a}
#equation-art[data-treatment="8"] .previous-equation-card{background:#000;border-color:#454b52}
#equation-art[data-treatment="8"] .previous-equation-card>small,#equation-art[data-treatment="8"] .previous-equation-status{color:#c5cbd1}
#equations-pane:has(#equation-art[data-treatment="7"]) #equation-navigation{background:#fff;border-color:#b7bec4;box-shadow:none;color:#111}
#equations-pane:has(#equation-art[data-treatment="7"]) #equation-navigation button{background:#f2f4f5;border-color:#b7bec4;color:#111;box-shadow:none}
#equations-pane:has(#equation-art[data-treatment="7"]) #position{color:#35424a}
#equations-pane:has(#equation-art[data-treatment="7"]) #equation-navigation button:hover:not(:disabled){background:#e1e6e9;border-color:#687680}
#equations-pane:has(#equation-art[data-treatment="8"]) #equation-navigation{background:#000;border-color:#454b52;box-shadow:none}
#equations-pane:has(#equation-art[data-treatment="8"]) #equation-navigation button{background:#14171a;border-color:#454b52;color:#fff;box-shadow:none}
#equations-pane:has(#equation-art[data-treatment="8"]) #position{color:#c5cbd1}
#equations-pane:has(#equation-art[data-treatment="8"]) #equation-navigation button:hover:not(:disabled){background:#2b3035;border-color:#a1a9b0}
@media print{html,body{height:auto!important;overflow:visible!important}body{display:block}#print-notes article{break-inside:auto}#print-notes section{padding-block:12pt}#print-notes svg{fill:#111!important;color:#111!important}#print-notes svg *{fill:inherit}}

#equations-pane:not(:has(#equation-art[data-has-previous="true"])) #show-previous-equation{display:none}
.previous-equation-card{opacity:.86}

/* Loading uses the same World atmosphere and palette as the question shelf. */
#equation-loading{overflow:hidden;background:#080d15ed;letter-spacing:normal;isolation:isolate}
.preparation-atmosphere{position:absolute!important;inset:0!important;z-index:-1;opacity:.58;pointer-events:none;--sfi-parallax-accent:#bfe9fb;--sfi-parallax-accent-secondary:#c9b7ff;--sfi-parallax-accent-tertiary:#f0bddf}
.preparation-atmosphere .sfi-parallax-world-plane{position:absolute;inset:0}
.preparation-focus{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;padding:28px 18px;max-width:100%}
.preparation-focus::before{content:'';position:absolute;width:210px;height:210px;top:0;border-radius:50%;background:radial-gradient(circle,#bfe9fb12,transparent 67%);z-index:-1}
.preparation-emblem{width:132px;height:132px;margin-bottom:20px}
.preparation-emblem svg{display:block;width:100%;height:100%;overflow:visible}
.preparation-halo{stroke:#bfe9fb20;stroke-width:.6}
.preparation-orbits{transform-origin:80px 80px;animation:preparation-orbit-turn 14s linear infinite;stroke:#bfe9fbbb;stroke-width:1.1}
.preparation-orbits ellipse:nth-child(2){stroke:#c9b7ff88}.preparation-orbits ellipse:nth-child(3){stroke:#f0bddf66}
.preparation-satellite{fill:#bfe9fb;stroke:none;filter:drop-shadow(0 0 5px #bfe9fb)}
.preparation-core{fill:#eafaff;filter:drop-shadow(0 0 8px #bfe9fb)}
.preparation-eyebrow{font-size:9px;font-weight:600;letter-spacing:.2em;color:#a8bfce;margin-bottom:12px}
.preparation-focus strong{font-size:clamp(14px,1.1vw,18px);font-weight:500;letter-spacing:-.015em;color:#eaf4fa;line-height:1.4}
.preparation-caption{font-size:11px;line-height:1.6;color:#9db0bc;margin-top:9px}
@keyframes preparation-orbit-turn{to{transform:rotate(360deg)}}
@media(prefers-reduced-motion:reduce){.preparation-orbits{animation:none}}

.question-card{position:relative}.question-difficulty{position:absolute;right:9px;top:7px;max-width:135px;border:1px solid #bfe9fb33;border-radius:999px;padding:3px 6px;font-size:8px;line-height:1.2;color:#bfe9fb;background:#0a1727cc;white-space:nowrap}
.question-difficulty[data-level="8"],.question-difficulty[data-level="9"],.question-difficulty[data-level="10"]{border-color:#c9b7ff55;color:#dacefa;background:#201a35cc}
.question-difficulty[data-level="0"]{color:#9db0bc;border-color:#9db0bc33}

#equation-loading,.preparation-atmosphere,.preparation-atmosphere .sfi-parallax-world-plane{border:0!important;outline:0!important;box-shadow:none!important}
.preparation-focus::before{display:none}
.preparation-atmosphere .sfi-parallax-world-plane::before,.preparation-atmosphere .sfi-parallax-world-plane::after{border:0!important;box-shadow:none!important}

/* The animated bar is the preparation indicator; no decorative emblem/frame. */
#equation-loading{background:#080d15ed}


#equation-loading .preparation-caption{margin-top:-13px;font-size:11px;line-height:1.6;color:#9db0bc}

#equation-size{display:flex;gap:3px;padding-left:8px;margin-left:2px;border-left:1px solid #334452}
#equation-treatment{gap:5px;align-items:center;flex-wrap:wrap}#equation-size button{padding-inline:8px}
.solution-step-heading{display:flex;align-items:center;gap:8px;margin:0 8px 13px}
.solution-step-badge{display:inline-flex;align-items:center;gap:8px;padding:5px 8px;border:1px solid #bfe9fb33;border-radius:7px;background:#bfe9fb0a;color:#bfe9fb}
.solution-step-badge>span{font-size:9px;letter-spacing:.08em;text-transform:uppercase}.solution-step-badge>b{font-size:13px;font-weight:500;font-variant-numeric:tabular-nums}
.solution-answer-badge{padding:5px 9px;border:1px solid #38f6c455;border-radius:999px;background:#38f6c40c;color:#a7f6db;font-size:10px;letter-spacing:.03em}
#equation-art[data-treatment="7"] .solution-step-badge{color:#35424a;background:#f2f4f5;border-color:#b7bec4}
#equation-art[data-treatment="7"] .solution-answer-badge{color:#165a46;background:#edf7f2;border-color:#9bc9b8}
#equation-art[data-treatment="8"] .solution-step-badge{color:#ddd;background:#ffffff08;border-color:#454b52}

.previous-processing{display:none;position:absolute;inset:20px 0 0;flex-direction:column;align-items:center;justify-content:center;gap:12px;background:inherit;font-size:9px;color:inherit;z-index:2}
.previous-equation-card:has(.previous-equation-status[data-phase="preparing"]:not(:empty)) .previous-processing{display:flex}
.previous-equation-status[data-phase="preparing"]{clip-path:inset(50%);width:1px;height:1px;overflow:hidden}
#equation-art[data-treatment="7"] .previous-processing{color:#35424a}#equation-art[data-treatment="8"] .previous-processing{color:#c5cbd1}

.native-solution-sheet section{position:relative;border-bottom:0}
.native-solution-sheet section::after{content:'';position:absolute;left:8px;right:8px;bottom:0;height:1px;background:linear-gradient(90deg,transparent,#bfe9fb55 22%,#c9b7ff55 63%,#f0bddf22 85%,transparent)}
.native-solution-sheet section:last-child::after,.native-solution-sheet .answer-step::after{display:none}
#equation-art[data-treatment="7"] .native-solution-sheet section::after{background:linear-gradient(90deg,transparent,#659bb466 22%,#9b88bd66 65%,transparent)}

#equation-loading .preparation-eyebrow{margin:0 0 -10px;font-size:9px;letter-spacing:.2em;color:#a8bfce}

.previous-equation-card>small{text-align:center}


.question-math .question-processing{width:85%;margin:16px auto}

/* Layout only: track, fill, bright leading edge and transition come from World Parallax. */
.tutor-preparation .sfi-parallax-loader-track{width:min(300px,100%);flex:none}
.previous-processing .sfi-parallax-loader-track{width:75%;flex:none}

.prototype-global-brand>a{font:inherit;color:inherit;letter-spacing:inherit}.prototype-global-brand small a{font:inherit;color:inherit;letter-spacing:inherit}.prototype-global-brand small a:hover{color:#d3e7f3;text-decoration:underline}.prototype-global-brand small span{margin-left:5px}

#equation-task{flex:none;margin:0;padding:10px 18px 8px;color:#d3e7f3;font:500 15px/1.4 Inter,system-ui,sans-serif}#equation-task:empty{display:none}@media(max-width:700px){#equation-task{padding:5px 9px;font-size:11px;line-height:1.35}}

/* Keep the task with its completed canonical equation, never as a text fallback. */
#equation-task[hidden]{display:none}
#equation-content[data-equations-loading=true] #equation-loading{display:grid;inset:0;background:#080d15ed}
.sfi-account-panel dialog.tutor-question-access{width:min(520px,calc(100vw - 24px));}
.tutor-question-access>.sfi-account-muted{font-size:14px;line-height:1.6;margin:20px 0}
.tutor-question-access>.sfi-account-primary,.tutor-question-access>.sfi-account-secondary{width:100%;margin:6px 0;min-height:44px}

/* Tutor chrome stays secondary to the canonical equation stage.
   Fallbacks match sfi-app-system.css panel tokens exactly; the standalone tutor
   does not load the complete World layout stylesheet. */
.tutor-preparation .preparation-focus{width:min(360px,calc(100% - 32px));gap:7px;padding:18px 22px;border-radius:14px;background:var(--sfi-panel-bg,linear-gradient(112deg,rgba(13,18,28,.74) 0%,rgba(10,15,24,.66) 54%,rgba(8,13,21,.5) 100%));border:1px solid var(--sfi-panel-border,rgba(191,232,251,.25));box-shadow:var(--sfi-panel-shadow,0 24px 80px rgba(0,0,0,.46),14px 0 48px rgba(0,0,0,.1),inset 0 1px rgba(255,255,255,.045));-webkit-backdrop-filter:var(--sfi-panel-backdrop,blur(20px) saturate(115%));backdrop-filter:var(--sfi-panel-backdrop,blur(20px) saturate(115%))}
.tutor-preparation .preparation-focus strong{font-size:14px;font-weight:500;color:var(--sfi-text,rgba(255,255,255,.9));letter-spacing:-.01em}
#equation-loading .preparation-caption{margin:0;font-size:11px;line-height:1.45;color:#a1b6c5}
.tutor-preparation .sfi-parallax-loader-track{margin-top:8px;width:100%}
#equation-content[data-solution-pending=true][data-has-given=true] #equation-loading .preparation-focus{gap:7px;padding:14px 20px}
#equation-task{margin:7px 12px;padding:8px 11px;border:1px solid var(--sfi-panel-border,rgba(191,232,251,.25));border-radius:10px;background:var(--sfi-panel-bg,linear-gradient(112deg,rgba(13,18,28,.74) 0%,rgba(10,15,24,.66) 54%,rgba(8,13,21,.5) 100%));-webkit-backdrop-filter:var(--sfi-panel-backdrop,blur(20px) saturate(115%));backdrop-filter:var(--sfi-panel-backdrop,blur(20px) saturate(115%));font-size:13px;line-height:1.4;color:#d3e7f3}
#question-blocks .question-card:is([data-preparing=true],:has(.question-pending)){background:linear-gradient(145deg,#13202e,#101622);border-color:#435565}
#question-blocks .question-card[data-preparing=true][aria-pressed=true]{background:linear-gradient(145deg,#1c3042,#1b2033);border-color:#aacbdd;box-shadow:inset 0 0 0 1px #bfe9fb22}
.question-card:is([data-preparing=true],:has(.question-pending))>.question-atmosphere{display:none}
.question-card:not([aria-pressed=true]) .question-processing{visibility:hidden}
.question-card[data-preparing=true]:not([aria-pressed=true]){border-color:#344454;color:#9eb4c4}
.question-card[data-preparing=true] .question-status{color:#9eb0be}
#stop-preparation,#retry-preparation{margin:0;padding:5px 9px;border:1px solid #526e8055;border-radius:8px;white-space:nowrap;background:#10202b;color:#bdd2df}
@media(max-width:700px){#equation-task{margin:4px 7px;padding:5px 8px;font-size:11px;border-radius:8px}.tutor-preparation .preparation-focus{padding:13px 16px;width:min(300px,calc(100% - 24px))}.tutor-preparation .preparation-focus strong{font-size:12px}#stop-preparation,#retry-preparation{padding:3px 7px;font-size:10px}}

.question-pending{color:#7890a1;font-size:14px;letter-spacing:5px;padding-left:2px}

#equations-pane>.sample-explanation{margin:0 12px 7px;padding:9px 11px;border-left:2px solid #a8cfff66;font:12px/1.5 system-ui;color:#c3d7e5}
#equations-pane>.sample-explanation strong{font-size:10px;color:#b5ccdd;font-weight:500}
#equations-pane>.sample-explanation p{margin:4px 0 0}
#equations-pane>.sample-explanation[hidden]{display:none}
@media(max-width:700px){#equations-pane>.sample-explanation{display:none}}

.question-card[data-preparing=true]:not([aria-pressed=true]) .question-status::before{animation:none;border-color:#6d83a0}

/* Session history keeps version actions inside their own spaced group. */
#sessions-dialog{box-sizing:border-box;overflow-y:auto;background:var(--sfi-panel-bg,linear-gradient(112deg,rgba(13,18,28,.74),rgba(10,15,24,.66) 54%,rgba(8,13,21,.5)));backdrop-filter:blur(20px) saturate(115%)}
#sessions-dialog .share-heading,#original-dialog .share-heading,#session-share .share-heading,#homework-camera .share-heading,.homework-upload-review .share-heading{align-items:center;margin-bottom:16px}
#sessions-dialog .share-heading h2,#original-dialog .share-heading h2,#session-share .share-heading h2,#homework-camera .share-heading h2,.homework-upload-review .share-heading h2{margin:0;line-height:1.3}
#sessions-description{margin:0;overflow-wrap:anywhere}
#session-list{gap:12px;margin:18px 0}
#session-list .saved-session{display:grid;gap:10px;padding:12px;border:1px solid rgba(191,232,251,.16);border-radius:14px;min-width:0;background:rgba(7,15,25,.2)}
#session-list button{min-width:0;max-width:100%;white-space:normal;overflow-wrap:anywhere;border-radius:10px;line-height:1.45}
#session-list .session-open{width:100%;padding:12px;text-align:left}
#session-list .session-versions-toggle{justify-self:start;display:block;padding:7px 11px;font-size:12px}
#session-list .session-versions{display:grid;gap:8px;padding:10px 0 0;border-top:1px solid rgba(191,232,251,.16)}
#session-list .session-versions[hidden]{display:none}
#session-list .session-versions button{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 12px}
#session-list .session-versions span{text-align:right}
#session-list .session-message{margin:0;padding:12px;color:#aec2cf;font-size:12px;line-height:1.6}
#session-account{width:100%;padding:11px 14px;border-radius:10px}
@media(max-width:600px){#sessions-dialog{width:calc(100vw - 24px);padding:16px;max-height:calc(100dvh - 32px)}#session-list .saved-session{padding:10px}#session-list .session-versions button{align-items:flex-start}#session-list .session-versions span{max-width:65%}}

/* Session metadata reads as a compact set of facts, not a floating sentence. */
#session-list .session-metadata{display:flex;flex-wrap:wrap;gap:6px;margin-top:3px}
#session-list .session-meta-badge{display:inline-flex;align-items:center;padding:4px 8px;border:1px solid rgba(163,199,233,.22);border-radius:999px;background:rgba(108,159,202,.09);color:#bad7eb;font-size:10px;line-height:1.35}
#session-list .session-meta-badge[data-kind=storage]{color:#d3c2ee;border-color:rgba(183,150,226,.25);background:rgba(153,111,207,.1)}
body>header #notes.sfi-share-action,body>header #sessions.sfi-share-action{display:inline-flex;align-items:center;justify-content:center;gap:6px;border-radius:10px}
body>header #notes .sfi-share-action-icon,body>header #sessions .sfi-share-action-icon{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
body>header #notes .sfi-share-action-label,body>header #sessions .sfi-share-action-label{display:none}

#session-list .saved-session{padding:0;gap:0;background:linear-gradient(125deg,rgba(102,158,203,.09),rgba(134,108,184,.06));border-color:rgba(166,199,231,.18);overflow:hidden}
#session-list .saved-session[data-current=true]{border-color:rgba(160,172,242,.44)}
#session-list .session-open{position:relative;padding:16px 40px 16px 16px;border:0;border-radius:0;background:transparent;gap:10px}
#session-list .session-open::after{content:'›';position:absolute;right:16px;top:50%;transform:translateY(-50%);font-size:24px;font-weight:300;color:#a7cfe7}
#session-list .session-open:hover{background:transparent}
#session-list .saved-session:has(.session-open:hover){background:linear-gradient(110deg,rgba(129,189,232,.12),rgba(172,136,225,.09));border-color:rgba(177,204,241,.4)}
#session-list .session-open:focus-visible{outline-offset:-3px;border-radius:13px}
#session-list .session-open>strong{font-size:14px;color:#e6f2fa;line-height:1.45}
#session-list .session-meta-badge[data-kind=current]{color:#d8d3ff;background:rgba(147,132,232,.15);border-color:rgba(176,161,255,.35)}
#session-list .session-versions-toggle{margin:6px 16px 14px;padding:5px 9px;border-color:rgba(173,198,223,.15);background:rgba(167,190,222,.04);color:#afc5d6;font-size:11px}
#session-list .session-versions{margin:0 16px 14px;padding-top:12px}
#session-account{width:100%;min-height:42px;border-radius:12px;background:linear-gradient(110deg,rgba(113,157,201,.12),rgba(147,112,203,.12));border-color:rgba(170,191,225,.24)}

#visual-title{color:inherit}#visual-title[href]{text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(140,190,255,.45)}#visual-title[href]:hover{color:#c3e7ff;text-decoration-color:currentColor}

#visual-title[href]{display:inline-flex;align-items:center;padding:4px 9px;border:1px solid #446079;border-radius:999px;background:#142332;color:#c7e7ff;font-size:11px;font-weight:500;line-height:1.4;text-decoration:none;white-space:nowrap}
#visual-title[href]:hover{background:#20364b;border-color:#88c8ed;color:#fff}
#visual-title[href]:focus-visible{outline:2px solid #99ddff;outline-offset:3px}

/* A child iframe's explicit visibility must not reveal the warmed first-step card. */
#equation-art:not(.with-previous) .previous-equation-card{opacity:0!important;pointer-events:none}
body>header #account-controls button[data-sfi-account-control="account"]{display:grid;place-items:center;padding:0;width:38px;height:38px;min-width:38px;line-height:1}
body>header #account-controls button[data-sfi-account-control="account"]>svg{display:block;width:20px;height:20px;margin:0;flex:none}
@media(max-width:650px){body>header #account-controls button[data-sfi-account-control="account"]{width:36px;height:36px;min-width:36px;min-height:36px}}


/* Natural-height caption overlays the lower stage without resizing its canvas. */
#equations-pane .sample-explanation{position:absolute;bottom:88px;left:12px;right:12px;z-index:2;margin:0;padding:8px 11px;border-left:2px solid #a8cfff66;background:#080e16e8;font:12px/1.5 system-ui;color:#c3d7e5;pointer-events:auto}
#equations-pane .sample-explanation strong{font-size:10px;color:#b5ccdd;font-weight:500}
#equations-pane .sample-explanation p{margin:4px 0 0}
#equations-pane .sample-explanation[hidden]{display:none}
@media(max-width:700px){#equations-pane .sample-explanation{display:none}}
.sfi-parallax-loader-track.tutor-processing-trail i{width:calc(100% - 4px);max-width:none;transform-origin:left center;transition:none;will-change:transform}
@media(prefers-reduced-motion:reduce){.sfi-parallax-loader-track.tutor-processing-trail i{transition:none}}
.previous-equation-card{transition:width 1100ms linear,height 1100ms linear}
@media(prefers-reduced-motion:reduce){.previous-equation-card{transition:none}}

.previous-equation-card>small{position:absolute;top:3px;left:7px;height:auto;padding:0 4px;font-size:8px;line-height:12px;text-align:left;background:#080e16d9;border-radius:3px;z-index:2;pointer-events:none}
.previous-equation-art{inset:0}

/* Two explicit layout trials. Captions never participate in canvas height. */
#equation-layout-choice{display:flex;gap:4px}
#equation-layout-choice button{font-size:10px;padding:5px 7px}
#equation-layout-choice button[aria-pressed=true]{background:#253b4c;border-color:#88b5d1}
#equations-pane[data-explanation-layout] .sample-explanation{top:8px;bottom:auto}
#equations-pane[data-explanation-layout] .previous-equation-card{top:auto;bottom:12px;left:12px;right:auto}
#equations-pane .previous-equation-card>small{top:4px;left:7px;padding:1px 5px;border:1px solid #526e80;border-radius:4px;line-height:12px}
#equations-pane[data-explanation-layout=beside] .sample-explanation{left:10px;right:auto;width:clamp(140px,30%,210px);margin:0}
#equations-pane[data-explanation-layout=beside] #equation-art{left:calc(clamp(140px,30%,210px) + 24px)}
@media(max-width:700px){#equations-pane[data-explanation-layout=beside] #equation-art{left:0}#equation-layout-choice{display:none}}

.tutor-graph-loading{position:absolute;inset:0;z-index:3;display:grid;place-content:center;justify-items:center;gap:14px;background:#080e16;color:#bfe8fb;font:12px/1.5 system-ui}
.tutor-graph-loading[hidden]{display:none}

#equations-pane:has(#show-all[aria-pressed=true]) .sample-explanation,
#equations-pane:has(#show-all[aria-pressed=true]) #equation-layout-choice{display:none}
#equations-pane:has(#show-all[aria-pressed=true]) #equation-art{left:0}

#equations-pane[data-explanation-layout=beside] #equation-art{width:auto;right:0}
#equations-pane:has(#show-all[aria-pressed=true]) #equation-art{width:100%}
@media(max-width:700px){#equations-pane[data-explanation-layout=beside] #equation-art{width:100%}}

/* One preparation card for equations and graphs, including responsive type. */
.tutor-preparation{font:14px/1.4 Inter,system-ui,sans-serif;letter-spacing:normal;grid-template-columns:minmax(0,1fr)}
.tutor-preparation .preparation-focus{width:320px;max-width:calc(100% - 32px)}
#equation-content[data-solution-pending=true][data-has-given=true] #equation-loading .preparation-focus{padding:18px 22px}
.tutor-graph-loading{background:#080d15ed;gap:20px}
.native-solution-sheet{padding-inline:8px}
.native-solution-sheet img{margin-inline:0}
.native-solution-sheet .answer-step{background:transparent}
@media(max-width:700px){.tutor-preparation .preparation-focus{width:300px;max-width:calc(100% - 24px)}#equation-content[data-solution-pending=true][data-has-given=true] #equation-loading .preparation-focus{padding:13px 16px}}
/* Interaction locks during a step morph must not dim the question shelf. */
#question-blocks .question-card:disabled:not(.is-preview){opacity:1}
#equation-loading.tutor-preparation{font:14px/1.4 Inter,system-ui,sans-serif}

#equation-content[data-preparation-finishing=true] #equation-loading{display:grid}
#equations-pane>.pane-heading>#restore-visual{order:-1;padding:7px 11px;font-size:12px;font-weight:600;color:#dcf4ff;border-color:#84b6ce;background:#183346;flex:none}
#equations-pane>.pane-heading>#restore-visual::before{content:none}