/* Product learning surfaces inherit each World's functional colors. */
.learning-nav{display:flex;align-items:center;gap:4px;margin-left:10px;flex-wrap:wrap}.learning-nav button{font:600 13px var(--font-ui,system-ui);padding:9px 12px;border:1px solid transparent;background:transparent;color:inherit;border-radius:7px;cursor:pointer}.learning-nav button:hover,.learning-nav button:focus-visible{background:var(--accent-soft,#e6eff9);border-color:var(--accent,#287bd0)}
.learn-dialog,.glossary-dialog{--learn-ink:var(--text,#17334a);--learn-muted:var(--muted,#536779);color:var(--learn-ink);background:var(--panel,#fff);padding:0;border:1px solid var(--border,#cbd8e1);border-radius:15px;width:min(1120px,calc(100vw - 40px));max-width:none;max-height:calc(100dvh - 40px);box-shadow:0 24px 80px #081e3540}.learn-dialog::backdrop,.glossary-dialog::backdrop{background:#10233475;backdrop-filter:blur(3px)}
.learn-dialog-top,.glossary-dialog-top{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 24px;border-bottom:1px solid var(--border,#d6e0e7);position:sticky;top:0;background:var(--panel,#fff);z-index:3}.learn-dialog-top h2,.glossary-dialog-top h2{margin:0;font-size:20px}.learn-dialog-top button,.glossary-dialog-top button,.learn-back{border:1px solid var(--border,#b9c9d6);border-radius:7px;background:var(--panel,#fff);color:inherit;min-height:40px;padding:7px 13px;cursor:pointer;font:inherit}.learn-body,.glossary-dialog .help-panel{padding:24px 32px;max-height:calc(100dvh - 125px);overflow:auto}.glossary-dialog .help-panel{display:block!important}.learn-body :focus-visible,.glossary-dialog :focus-visible{outline:3px solid var(--accent,#287bd0);outline-offset:3px}
.learn-kicker{font:600 11px/1.5 var(--font-ui,system-ui);letter-spacing:.08em;text-transform:uppercase;color:var(--accent,#2260a2)}.learn-home h1,.learn-article h1{font:600 clamp(28px,3.4vw,42px)/1.14 var(--font-display,Georgia,serif);letter-spacing:-.025em;margin:10px 0 16px}.learn-lede{font-size:17px;line-height:1.6;max-width:720px;color:var(--muted,#516577)}.learn-controls{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:24px 0}.learn-views{display:flex;border-bottom:1px solid var(--border,#cbd8e1);gap:18px}.learn-views button{font:600 15px var(--font-ui,system-ui);background:transparent;color:inherit;border:0;border-bottom:3px solid transparent;padding:13px 2px;cursor:pointer}.learn-views button[aria-pressed=true]{border-color:var(--accent,#287bd0);color:var(--accent,#2260a2)}.learn-controls input{flex:1;min-width:160px}.learn-controls input,.learn-controls select{background:var(--panel,#fff);color:inherit;border:1px solid var(--border,#b9c9d6);padding:12px;border-radius:7px;font:inherit}.learn-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.learn-card{display:block;text-decoration:none!important;color:inherit!important;border:1px solid var(--border,#cbd8e1);border-radius:10px;padding:23px;background:var(--panel,#fff);transition:border-color .15s,box-shadow .15s}.learn-card:hover{border-color:var(--accent,#287bd0);box-shadow:0 4px 15px #102c4610}.learn-card h3{font:600 23px/1.2 var(--font-display,Georgia,serif);margin:10px 0}.learn-card p{font-size:14px;line-height:1.55;color:var(--muted,#536779);margin:0 0 18px}.learn-card-link{font-size:13px;font-weight:600;color:var(--accent,#2260a2)}.learn-result-count{font-size:13px;color:var(--muted,#536779)}
.learn-article-heading{padding:10px 0 22px;border-bottom:1px solid var(--border,#d6e0e7)}.learn-article-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:38px;padding-top:24px}.learn-section{position:relative;margin:0 0 28px}.learn-section h2,.learn-next h2,.learn-mistakes h2,.learn-answer h2{font-size:19px;line-height:1.3;margin:0 0 10px}.learn-prose p,.learn-prose li{font-size:15px;line-height:1.75}.learn-prose p{margin:8px 0}.learn-equation{overflow:auto;border-left:3px solid var(--accent,#287bd0);background:var(--accent-soft,#eef4fa);border-radius:0 7px 7px 0;font:500 19px/1.65 var(--font-math,Georgia,serif);margin:16px 0;color:var(--text,#17334a);white-space:normal}.learn-step-number{display:inline-grid;place-items:center;background:var(--accent-soft,#e9f1f8);color:var(--accent,#2260a2);border-radius:50%;height:28px;width:28px;font:600 13px system-ui;margin-bottom:10px}.learn-practice{align-self:start;position:sticky;top:0;padding:21px;border:1px solid var(--border,#cbd8e1);border-radius:10px;background:var(--panel,#fff)}.learn-practice h2{font:600 22px/1.2 var(--font-display,Georgia,serif);margin:10px 0}.learn-practice p{font-size:13px;line-height:1.65}.learn-action{display:flex;justify-content:space-between;align-items:center;gap:10px;background:var(--accent,#2861a4);color:var(--accent-contrast,#fff)!important;text-decoration:none!important;border:1px solid transparent;border-radius:7px;padding:12px;font:600 13px/1.4 var(--font-ui,system-ui);margin:10px 0;cursor:pointer}.learn-secondary{background:transparent;color:var(--text,#17334a)!important;border-color:var(--border,#b9c9d6)}.learn-small-link{display:block;font-size:13px;margin:14px 0}.learn-note{color:var(--muted,#536779)}.learn-next,.learn-answer{padding:20px;background:var(--accent-soft,#eef4fa);border-radius:9px;margin:24px 0}.learn-sources{font-size:13px;line-height:1.6;border-top:1px solid var(--border,#ccd9e2);padding:18px 0}.learn-sources summary{cursor:pointer}.learn-terms{display:flex;flex-wrap:wrap;gap:7px;margin:10px 0}.learn-terms button{background:transparent;color:inherit;border:1px solid var(--border,#ccd9e2);border-radius:20px;padding:6px 10px;font:inherit;cursor:pointer}.learn-cross-results{margin-top:24px;border-top:1px solid var(--border,#cbd8e1);padding-top:18px}.learn-cross-results button{display:block;width:100%;text-align:left;margin:8px 0;border:1px solid var(--border,#ccd9e2);border-radius:7px;padding:12px;background:var(--panel,#fff);color:inherit;cursor:pointer}.learn-return{position:fixed;bottom:18px;right:18px;z-index:15000;border:1px solid var(--border,#aebfca);border-radius:30px;padding:12px 18px;background:var(--panel,#fff);color:var(--text,#17334a);box-shadow:0 4px 18px #10233430;cursor:pointer;font:600 13px system-ui}.learn-return[hidden]{display:none}
.welcome-strip{margin:0 20px 14px;padding:20px 26px;border:1px solid var(--border,#cbd8e1);background:var(--panel,#fff);border-radius:12px;display:flex;align-items:center;justify-content:space-between;gap:24px}.welcome-strip[hidden]{display:none}.welcome-strip h1{font:600 25px/1.2 var(--font-display,Georgia,serif);margin:0 0 8px}.welcome-strip p{font-size:14px;line-height:1.6;max-width:570px;margin:0;color:var(--muted,#52687a)}.welcome-actions{display:flex;flex-wrap:wrap;gap:8px;}.welcome-actions button{padding:11px 14px;border:1px solid var(--border,#b9c9d6);border-radius:7px;background:var(--panel,#fff);color:inherit;font:600 13px system-ui;cursor:pointer}.welcome-actions .welcome-primary{background:var(--accent,#2861a4);color:var(--accent-contrast,#fff);border-color:transparent}.welcome-dismiss{align-self:start;background:transparent;border:0;font:22px system-ui;color:inherit;cursor:pointer;min-width:32px;min-height:32px}.biology-learn-link{margin:4px 0 14px;display:inline-block;color:var(--accent-text,var(--accent,#2260a2));font-size:13px}.biology-workflow-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.biology-workflow-actions button{padding:10px 12px;border:1px solid var(--border,#bdcbd6);border-radius:7px;color:inherit;background:var(--panel,#fff);cursor:pointer}.biology-number-cells{display:flex;flex-wrap:wrap;gap:8px}.biology-number-cells input{width:92px}.biology-record-card .biology-number-cells label{font-size:12px}
.learn-public{--text:#18384a;--muted:#506575;--panel:#fff;--border:#cfdae2;--accent:#245c98;--accent-soft:#eef4f9;margin:0;background:#f0f5f8;color:var(--text);font:15px/1.6 system-ui,sans-serif}.learn-public-header{display:flex;align-items:center;justify-content:space-between;gap:20px;max-width:1080px;margin:auto;padding:20px 24px}.learn-public-brand{display:flex;align-items:center;gap:10px;font:600 25px Georgia,serif;text-decoration:none;color:inherit}.learn-public-header nav{display:flex;gap:20px;font-size:14px}.learn-public a{color:var(--accent)}.learn-public-main{max-width:1040px;margin:0 auto 40px;padding:32px;background:white;border:1px solid var(--border);border-radius:14px}.learn-public-footer{max-width:1040px;margin:24px auto;padding:0 24px;font-size:13px;color:var(--muted)}.learn-breadcrumb{font-size:13px;margin-bottom:20px}.learn-public .learn-home>p{max-width:700px}.learn-public *{box-sizing:border-box}
@media(max-width:1000px){.toolbar{flex-wrap:wrap}.learning-nav{order:3;width:100%;justify-content:center;margin:0;padding-top:4px}.welcome-strip{flex-wrap:wrap}.welcome-actions{min-width:0}.learn-article-layout{grid-template-columns:minmax(0,1fr) 230px;gap:24px}}
@media(max-width:650px){.learning-nav{justify-content:flex-start;border-top:1px solid var(--border,#d6e0e7);gap:6px}.learning-nav button{padding:8px 12px;min-height:42px}.learn-dialog,.glossary-dialog{width:100%;max-height:100dvh;height:100dvh;border-radius:0;border:0;margin:0}.learn-dialog-top,.glossary-dialog-top{padding:12px 16px}.learn-body,.glossary-dialog .help-panel{padding:20px 18px;max-height:calc(100dvh - 67px)}.learn-grid{grid-template-columns:1fr}.learn-article-layout{display:flex;flex-direction:column;gap:20px}.learn-practice{position:static;order:0;width:100%;box-sizing:border-box}.learn-practice>.learn-kicker,.learn-practice>p:not(.learn-note){display:none}.learn-practice h2{font-size:20px}.learn-article h1{font-size:31px}.learn-action{min-height:42px;box-sizing:border-box}.welcome-strip{margin:8px 12px 16px;padding:19px;position:relative;gap:14px}.welcome-strip h1{font-size:24px;padding-right:16px}.welcome-dismiss{position:absolute;right:6px;top:6px}.welcome-actions{width:100%}.welcome-actions button{min-height:44px}.learn-return{bottom:74px;right:12px}.learn-public-header{flex-wrap:wrap}.learn-public-main{padding:22px 18px;border-radius:0;border-left:0;border-right:0}.learn-public .learn-practice{order:0}.learn-dialog button,.glossary-dialog button{touch-action:manipulation}}
@media(prefers-reduced-motion:reduce){.learn-card{transition:none}}
@media print{.learning-nav,.welcome-strip,.learn-return{display:none!important}.learn-public-header nav,.learn-practice{display:none}.learn-public-main{border:0;margin:0;padding:0}.learn-article-layout{display:block}}

/* The resource row stays visible without squeezing document/file controls. */
body > .toolbar{flex-wrap:wrap!important;row-gap:8px!important;max-width:100%;box-sizing:border-box}
body > .toolbar .learning-nav{flex:0 0 100%;order:5;margin:0;justify-content:flex-start;border-top:1px solid var(--border,#d4dfe7);padding-top:4px;box-sizing:border-box}
body > .toolbar .document-meta{min-width:150px;flex:1 1 240px;overflow:hidden}
body > .toolbar .toolbar-actions{margin-left:auto}
body > .toolbar #help-button{display:none}
.welcome-strip{box-sizing:border-box;flex-wrap:wrap;position:relative;padding-right:42px}
.welcome-strip>div:first-child{flex:1 1 380px;min-width:0}.welcome-actions{flex:1 1 400px;min-width:0}.welcome-dismiss{position:absolute;right:8px;top:8px}
.brand-mark .chemistry-mark{shape-rendering:geometricPrecision}.brand{gap:10px}.brand-mark{flex-shrink:0}
@media(max-width:650px){body > .toolbar .learning-nav{justify-content:space-evenly}.welcome-strip>div:first-child,.welcome-actions{flex-basis:100%}.welcome-strip{padding-right:24px}}
/* Welcome: one clear first step, two alternatives, and Learn as a quieter link. */
.welcome-actions .welcome-link{border-color:transparent;background:transparent;padding-inline:4px;color:var(--accent-text,var(--accent,#2260a2));font-weight:600;text-decoration:underline;text-underline-offset:3px}
@media(max-width:650px){.welcome-strip{margin:0 12px 10px;padding:16px 40px 16px 16px;gap:12px}.welcome-strip h1{font-size:21px;margin-bottom:6px}.welcome-strip p{font-size:13.5px}.welcome-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.welcome-actions .welcome-primary,.welcome-actions .welcome-link{grid-column:1/-1}.welcome-actions button{min-height:44px}}

.workspace-learning-footer{border-top:1px solid var(--border,#d0dce6);color:var(--muted,#526779)}.workspace-learning-footer h2{font-size:17px;color:var(--text,#17334a)}.workspace-learning-footer p{max-width:720px;line-height:1.6}.workspace-learning-footer a{color:var(--accent-text,var(--accent,#245c98))}@media print{}

/* Size the workspace from the actual header/welcome height. */
body:not(.learn-public){display:flex;flex-direction:column}
body > .toolbar{height:auto!important;min-height:0!important;flex-shrink:0;padding-top:8px;padding-bottom:6px;column-gap:18px}
body > .app-shell{flex:1 1 auto;min-height:0;height:auto!important}
body > .welcome-strip{flex-shrink:0}
body > .toolbar .document-meta{display:grid;grid-template-columns:minmax(100px,1fr) minmax(100px,1fr);gap:0 8px;max-width:550px}
body > .toolbar .document-meta input{width:100%;min-width:0;box-sizing:border-box}
body > .toolbar .document-meta .save-state{display:block;grid-column:1 / -1;padding-left:8px;font-size:10px}
body:not(.learn-public){--text:var(--ink);--border:var(--line);--accent:var(--accent-ui);--accent-contrast:var(--on-accent-ui);--accent-soft:var(--c96)}
.workspace-learning-footer{flex-shrink:0;padding:7px 24px;font-size:12px;display:flex;gap:14px;align-items:center}.workspace-learning-footer h2,.workspace-learning-footer p{display:none}
@media(max-width:650px){body > .toolbar .document-meta{display:none!important}.workspace-learning-footer{display:none}}

@media print{.workspace-learning-footer{display:none!important}}

.learn-controls input::placeholder{color:var(--muted,#536779);opacity:1}

/* Equations are typeset once; semantic MathML accompanies the visual layout. */
.learn-equation{position:relative;line-height:1.6;max-width:100%;box-sizing:border-box;padding:20px 18px;overflow-x:auto;font-size:19px}
.learn-math-accessible{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.learn-table-wrap{overflow-x:auto;margin:20px 0}.learn-table{width:100%;border-collapse:collapse;font:14px/1.6 var(--font-ui,system-ui);text-align:left}.learn-table caption{text-align:left;font-weight:600;margin-bottom:10px}.learn-table th,.learn-table td{padding:10px 12px;border:1px solid var(--border,#cbd8e1)}.learn-table thead{background:var(--accent-soft,#eef4fa)}
.learn-deeper,.learn-solution{border:1px solid var(--border,#cbd8e1);border-radius:8px;padding:14px 18px;margin:18px 0;line-height:1.7}.learn-deeper summary,.learn-solution summary{font-weight:600;cursor:pointer}.learn-deeper[open] summary,.learn-solution[open] summary{margin-bottom:12px}.learn-practice-problem{margin:28px 0;padding:22px;border:2px solid var(--accent,#2861a4);border-radius:10px}.learn-practice-problem h2{margin-top:0}.learn-solution h3{font-size:17px}
.learn-fragments{margin:20px 0;color:var(--text,#17334a)}.learn-fragments figcaption{font-size:14px;font-weight:600;margin-bottom:14px}.learn-fragments svg{width:100%;height:auto;min-width:280px;font:15px system-ui;display:block}.learn-fragments{overflow-x:auto}
@media(max-width:650px){.learn-equation{font-size:17px;padding:18px 12px}.learn-prose p{font-size:16px}.learn-practice-problem{padding:18px 14px}.learn-table th,.learn-table td{padding:8px}.learn-section{margin-bottom:32px}}

.learn-public-brand sup { font-size:.55em;line-height:0;vertical-align:super;margin-left:1px; }

/* Only authored alternate layouts opt into stacked long equations. */
.learn-prose:has(.learn-responsive-equation){container-type:inline-size}
.learn-responsive-equation .learn-equation-wide{display:none}
.learn-responsive-equation .learn-equation-narrow{display:block}
@container (min-width:620px){.learn-responsive-equation .learn-equation-wide{display:block}.learn-responsive-equation .learn-equation-narrow{display:none}}