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/* A calm, sequential classroom */
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@media(min-width:1200px){.reader-layout{grid-template-columns:155px minmax(0,720px)}.outline{font-size:11px}}
@media(max-width:1000px){main{padding:32px}.workspace>header{padding:12px 22px}.breadcrumb{display:none}.ai-chip{margin-left:auto}.reader-layout{display:block}.outline{position:static;margin-bottom:22px}.continue-card{padding:30px;gap:24px}.continue-card h2{font-size:26px}}
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.practice-picker{max-width:780px;padding:32px}.practice-picker .form-grid{grid-template-columns:1fr 1fr}.practice-picker .form-grid label:first-child{grid-column:1/-1}.practice-details{border-top:1px solid var(--line);margin-top:28px;padding-top:12px}.practice-details summary{font-size:12px;color:var(--muted)}.practice-details p{font-size:12px}.practice-picker>.primary{padding:12px 22px;background:#24583f;color:#fff;border-color:#24583f}@media(max-width:700px){.practice-picker{padding:24px}.practice-picker .form-grid{grid-template-columns:1fr}}
.task-skills{max-width:400px}.task-skills summary{font-size:11px;color:var(--muted);padding:6px 0}.task-skills ul{padding-left:18px;font-size:12px}
/* Subject courses, source-linked visuals, and readable explanations */
.course-tabs{display:flex;gap:28px;border-bottom:1px solid var(--line);margin:-4px 0 30px;overflow:auto}.course-tabs button{border:0;border-radius:0;padding:12px 0 15px;font-size:13px;white-space:nowrap;color:var(--muted)}.course-tabs button[aria-current]{color:var(--accent);border-bottom:3px solid var(--accent);font-weight:650}.course-series{background:#fff;border:1px solid var(--line);border-radius:14px;padding:0 28px}.subject-course{display:grid;grid-template-columns:82px 1fr auto;gap:22px;padding:27px 0;border-bottom:1px solid var(--line);align-items:start}.subject-course:last-child{border:0}.subject-course small{font-size:9px;letter-spacing:1px}.subject-course h2{margin:5px 0 7px;font-size:20px}.subject-course h2 button{border:0;padding:0;font:inherit;text-align:left;color:var(--ink)}.subject-course h2 button:hover{text-decoration:underline;background:none}.subject-course p{font-size:12px;margin:0}.subject-course details{font-size:12px}.subject-course details summary{padding:7px 0;color:var(--accent);font-size:12px}.subject-course details p{margin:8px 0}.course-open{align-self:center;white-space:nowrap;font-size:12px;border-color:transparent}.course-thumb{display:block;width:82px;height:72px;border-radius:9px;background:#e5eef5;padding:10px}.course-thumb svg{width:100%;height:100%;fill:none;stroke:#2c617d;stroke-width:2.5;stroke-linejoin:round}.tone-1{background:#e9e7f5}.tone-1 svg{stroke:#665b91}.tone-2{background:#e3f0ed}.tone-2 svg{stroke:#35786f}.tone-3{background:#f5ecdf}.tone-3 svg{stroke:#987137}.tone-4{background:#e7edf6}.tone-4 svg{stroke:#466e9f}.back-link{border:0;padding:0;margin-bottom:24px;font-size:12px}.course-outcomes{margin:0 0 24px;border-bottom:1px solid var(--line);padding-bottom:8px;font-size:13px}.worked-learning{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:32px 0;margin:38px 0;display:grid;grid-template-columns:minmax(0,1fr);gap:24px}.worked-example h2{margin-top:9px}.worked-example ol{padding-left:23px}.worked-example li{padding:5px 0;color:var(--muted)}.example-result{background:#edf5eb;border-left:3px solid #75a17a;padding:16px 20px;margin:22px 0;border-radius:0 7px 7px 0}.example-result p{margin:5px 0 0}.lesson-visual{min-width:0;background:#f7faf8;border:1px solid #e1e9e3;border-radius:11px;padding:22px}.concept-figure{margin:0}.concept-figure h3{font-size:15px;margin:0 0 12px}.concept-figure svg{width:100%;height:auto;max-height:580px;display:block}.concept-figure figcaption{font-size:11px;line-height:1.6;color:var(--muted);margin:12px 0}.diagram-node{fill:#fff;stroke:#a7beb0;stroke-width:1.5}.diagram-label{fill:#244b3a;font:20px system-ui,sans-serif}.diagram-edge{fill:none;stroke:#4b7863;stroke-width:2}.diagram-edge-label{fill:#526e5c;font:15px system-ui,sans-serif;paint-order:stroke;stroke:#f7faf8;stroke-width:5px;stroke-linejoin:round}.visual-sources{font-size:10px;line-height:1.8;color:var(--muted)}.visual-sources a{display:inline-block}.tutor-tools{display:flex;flex-wrap:wrap;gap:7px;margin:18px 0}.tutor-tools button{font-size:11px;padding:7px 10px;border-radius:18px}.ai-answer{white-space:normal}.ai-answer section{margin:19px 0}.ai-answer h4{font-size:13px;margin:0 0 8px;color:var(--ink)}.ai-answer p{font-size:13px;margin:8px 0;line-height:1.8}.ai-answer ul{font-size:13px;color:var(--muted);padding-left:20px}.ai-answer li{margin:6px 0}.ai-answer details{margin-top:18px}.ai-answer details summary{font-size:12px}#ai-visual{background:#f7faf8;border:1px solid var(--line);border-radius:10px;padding:18px;margin-bottom:20px}.resource-list{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0 25px}.resource-row{padding:23px 0;border-bottom:1px solid var(--line)}.resource-row:last-child{border:0}.resource-row small{font-size:11px}.resource-row h3{font-size:17px;margin:4px 0 8px}.resource-row p{font-size:12px;margin:7px 0}.resource-row details{font-size:12px}.resource-row summary{font-size:11px;padding:7px 0}.access-label{display:inline-block;font-size:10px;color:#556b5c;background:#f0f4ee;padding:4px 8px;border-radius:4px}.practice-resources{max-width:780px;margin-top:40px}.practice-resources .section-title h2{font-size:22px}
@media(min-width:1500px){.reader-layout{grid-template-columns:150px minmax(0,850px)}.worked-learning{grid-template-columns:minmax(0,1fr) minmax(0,.9fr);gap:28px}.lesson-visual{align-self:start}}
@media(max-width:700px){.course-tabs{gap:22px;margin-bottom:24px}.course-tabs button{font-size:12px}.course-series{padding:0 18px}.subject-course{grid-template-columns:54px 1fr;gap:14px;padding:23px 0}.course-thumb{width:54px;height:54px;padding:7px}.subject-course h2{font-size:17px}.subject-course h2 button{font-size:17px}.course-open{grid-column:2;justify-self:start;margin-top:-8px;padding:4px 0}.worked-learning{padding:25px 0}.lesson-visual{padding:15px}.diagram-label{font-size:21px}.resource-list{padding:0 20px}.practice-resources .section-title h2{font-size:20px}}
.learning-summary{margin:18px 0 25px}.learning-summary h3{font-size:14px;margin:20px 0 10px}.learning-summary.lesson{background:#fff;border:1px solid var(--line);border-radius:12px;padding:5px 24px 20px;margin:24px 0 32px}.topic-tags,.service-tags{display:flex;flex-wrap:wrap;gap:7px}.topic-tags span,.service-tags span{font-size:11px;background:#eff4f0;border:1px solid #e0e8e1;padding:4px 9px;border-radius:5px;color:#456352}.service-tags span{background:#edf2f8;color:#365c79;border-color:#dfe7f0}.learning-skills{padding-left:21px;font-size:13px;color:var(--muted)}.learning-skills li{margin:7px 0}.service-glossary{margin:0}.service-glossary>div{border-top:1px solid var(--line);padding:13px 0}.service-glossary dt{font-size:13px;font-weight:650}.service-glossary dd{margin:6px 0 0;font-size:12px;color:var(--muted);line-height:1.75}.service-glossary dd small{font-size:10px}.module-learning{font-size:12px;margin-bottom:20px}.module-learning>summary{font-size:12px}.lesson-services{color:#527b65!important;font-size:10px!important}.section-recall{background:#f3f7f1;border:1px solid #dfe7db;border-radius:10px;padding:4px 20px 14px;margin-top:24px}.section-recall>summary{font-size:13px;color:#315e40}.section-recall .recall-question{font-size:14px;color:var(--ink);margin:12px 0 20px}.section-recall textarea{min-height:130px;background:#fff;font-size:13px;line-height:1.8}.section-recall .actions{gap:10px;flex-wrap:wrap}.section-recall button{font-size:12px}.section-recall>.recall-state{font-size:11px;margin:15px 0 7px}.section-recall>small{font-size:10px}.recall-result{border-top:1px solid #d5e0d1;margin-top:20px;padding-top:20px}.recall-result>p{font-size:13px;margin:10px 0}.recall-result>ul{padding:0;list-style:none}.recall-result li{border-top:1px solid var(--line);padding:17px 0;line-height:1.7}.recall-result li>strong{display:block;font-size:13px;margin:7px 0}.recall-result li>p{font-size:12px;margin:7px 0}.recall-result blockquote{font-size:12px;margin:10px 0;padding:9px 14px;background:#fff;border-left:2px solid #9ab69c;white-space:pre-wrap;overflow-wrap:anywhere}.recall-badge{font-size:10px;border-radius:4px;padding:3px 7px;background:#e5eadf;color:#4e6249}.recall-badge.met{background:#dfeeda;color:#34552f}.recall-badge.partial{background:#f5ebd4;color:#765a29}.recall-badge.missing{background:#f2e4dd;color:#7c4933}.recall-next{background:#fff;padding:15px 18px;border-radius:7px;margin-bottom:15px}.recall-next>p{margin:5px 0;font-size:13px}.recall-disclaimer{font-size:10px!important;color:var(--muted)}.published-diagram img{width:100%;height:auto;display:block;background:white;border-radius:4px;object-fit:contain}.published-diagram>a{display:block}.published-diagram figcaption{font-size:11px;line-height:1.8}.image-unavailable{font-size:12px}.worked-example>small{font-size:10px;margin-top:15px}.source-guide{padding:20px;border:1px solid var(--line);border-radius:10px;background:#fff}.source-guide p{margin:10px 0 0;font-size:12px}.worked-example h2 a{color:var(--ink)}
@media(max-width:700px){.learning-summary.lesson{padding:3px 17px 16px}.section-recall{padding:3px 15px 14px}.service-glossary dd{font-size:12px}}
.worked-learning.without-diagram{grid-template-columns:1fr}
:root{--sticky-nav-height:0px;--sticky-header-height:82px}html{scroll-padding-top:calc(var(--sticky-nav-height) + var(--sticky-header-height) + 20px)}.workspace>header{position:sticky;top:var(--sticky-nav-height);z-index:12;background:#fff;box-shadow:0 3px 12px #203a3608}.outline{top:calc(var(--sticky-nav-height) + var(--sticky-header-height) + 20px)}@media(max-width:760px){.sidebar{position:sticky;top:0;z-index:13;background:#fff}.workspace>header{top:var(--sticky-nav-height)}}
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.reading-prose{font-size:15px;line-height:1.9;color:#344b44}.reader .content-block>.reading-prose{font-size:16px;max-width:72ch}.reading-points{padding-left:24px;margin:12px 0 20px}.reading-points>li{padding-left:5px;margin:12px 0}.worked-example .reading-points>li{color:#61523a}.selectable h1,.selectable h2{user-select:text}.lesson-takeaway{background:transparent!important;border:0!important;padding:0!important;border-radius:0!important;margin:26px 0 0!important}.lesson-takeaway h3{font-size:17px}.lesson-takeaway>ul{padding-left:22px;margin:12px 0 24px}.lesson-takeaway>ul>li{margin:14px 0;line-height:1.85}.lesson-takeaway [data-reading-text]{display:inline}.recall-paper>.actions{margin-top:24px}@media(max-width:700px){.reader .content-block>.reading-prose{font-size:15px}.reading-points{padding-left:21px}.reading-points>li{padding-left:2px}}
.service-overview{padding:8px 0 24px;border-bottom:1px solid var(--line);margin:16px 0 28px}.service-overview h2{font-size:23px;margin:10px 0 15px}.service-overview>p{font-size:16px;line-height:1.85;color:#3c514a;max-width:72ch}.service-overview h3{font-size:15px;margin:24px 0 12px}.service-concepts{display:flex;flex-wrap:wrap;gap:9px}.service-concepts>span{font-size:12px;padding:6px 11px;background:#edf3ef;border-radius:5px;color:#355b48}.lesson-sequence{padding-left:24px;font-size:14px}.lesson-sequence li{margin:9px 0}.lesson-sequence a{text-decoration:none}.lesson-sequence a:hover{text-decoration:underline}.aws-term{color:#23648a;text-decoration:underline;text-decoration-style:dotted;text-underline-offset:3px;text-decoration-thickness:1px}.aws-term:hover{background:#edf4f8;text-decoration-style:solid}.term-popover{position:fixed;z-index:160;width:min(380px,calc(100vw - 24px));max-height:calc(100vh - 24px);overflow:auto;border:1px solid #c5d7df;background:#fff;box-shadow:0 14px 50px #15382930;border-radius:12px;padding:20px}.term-popover-head{display:flex;justify-content:space-between;gap:16px;align-items:start;font-size:15px}.term-popover-head button{padding:1px 8px;font-size:20px;line-height:1.3}.term-popover p{font-size:13px;line-height:1.8;margin:15px 0}.term-popover>a,.term-popover>.term-explain{display:block;margin:12px 0 0;font-size:12px;text-align:center}.term-popover>.term-explain{width:100%}.tutor-paper .followup-row{display:block}.tutor-paper .followup-row textarea{width:100%;min-height:100px}.tutor-paper .followup-row button{display:block;margin:10px 0 16px;width:100%;font-size:13px}.tutor-paper>summary{display:list-item}.roadmap-references{padding:20px;margin-top:28px;border-top:1px solid var(--line)}.roadmap-references summary{font-size:13px}.roadmap-references p,.roadmap-references li{font-size:12px}.roadmap-references li{margin:14px 0}.roadmap-references small{display:block;color:var(--muted)}@media(max-width:700px){.service-overview>p{font-size:15px}.service-overview h2{font-size:21px}.term-popover{padding:17px}}
.beginner-paper{background:#eef5fb;border:1px solid #d2e0ec;border-radius:16px;padding:30px;margin:28px 0;color:#243f53}.beginner-paper h2{font-size:25px;margin:10px 0 18px}.beginner-paper p,.starter-glossary dd{font-size:15px;line-height:1.9;color:#344f61}.context-story{background:#fff;border-radius:10px;padding:20px 24px;margin:24px 0}.context-story h3{margin-top:0}.context-story p{margin-bottom:0}.starter-glossary{margin:0}.starter-glossary>div{padding:17px 0;border-bottom:1px solid #d5e1eb}.starter-glossary dt{font-size:15px;font-weight:700}.starter-glossary dd{margin:7px 0 0}.starter-glossary a{font-size:12px;white-space:nowrap}.reading-route{font-size:13px!important;margin:24px 0 0}.lesson-objectives{padding:12px 20px;background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:32px}.lesson-objectives>summary{font-size:14px;color:#395c4a}.reader .content-block>p{font-size:16px;line-height:1.95;max-width:72ch;color:#344b44}.reader .content-block{padding-top:12px;margin-top:36px}.worked-learning{background:#fff6e7;border:1px solid #e9d9b9;border-radius:16px;padding:28px;gap:26px;margin:30px 0 42px}.worked-example p,.worked-example li{color:#61523a;font-size:14px;line-height:1.85}.worked-example>small{display:block;line-height:1.7;margin-top:20px}.worked-example h2{font-size:23px}.worked-learning .lesson-visual{background:#fffaf1;border-color:#e8dcc5}.recall-paper{background:#f1edf9;border:1px solid #ded5ef;border-radius:16px;padding:30px;margin:35px 0}.recall-paper h2{font-size:25px}.recall-paper textarea{background:#fff;min-height:145px}.lesson-takeaway{border-left:3px solid #9a83bd;background:#fff9;padding:17px 20px;border-radius:0 8px 8px 0;margin:25px 0}.lesson-takeaway p{margin:8px 0 0}.section-recall{background:#edf5ef;border-color:#cbded0}.section-recall>summary{font-weight:650}.rationale.wrong{background:#fff0ef;border:1px solid #e5a29d;border-left:5px solid #b43b35;color:#762d29}.rationale.wrong strong{color:#9c2b26}.rationale.wrong p{color:#762d29}.rationale.alternative{background:#fff8ef;border:1px solid #e6d4bb;border-left:4px solid #c29457}.rationale.alternative strong{color:#805c2d}.rationale.right{background:#edf8ed;border:1px solid #a8cfa8;border-left:5px solid #3b8049}.rationale.right strong{color:#27683a}.tutor-paper{border:1px solid;border-radius:12px;padding:5px 16px 16px;margin:22px 0}.tutor-paper>summary{font-size:14px;font-weight:650;padding:12px 0;display:list-item}.tutor-paper>summary span{display:block;font-size:10px;font-weight:400;opacity:.8;margin-left:16px}.followup-paper{background:#edf3fa;border-color:#cfdeee}.save-paper{background:#f2eff9;border-color:#dbd0eb}.tutor-paper label{font-size:12px}.tutor-paper input,.tutor-paper textarea,.tutor-paper select{background:#fff}.followup-row{display:flex;align-items:flex-end;gap:10px}.followup-row label{flex:1;min-width:0}.followup-row textarea{resize:vertical;min-height:82px;max-height:320px;line-height:1.7}.followup-row button{flex:none;margin-bottom:16px;font-size:12px}.tutor-paper[open]>summary{border-bottom:1px solid #d9dfeb;margin-bottom:16px}.save-paper small{display:block;line-height:1.7}.aside-bottom #how-to-use{display:block;margin-bottom:20px;font-size:12px;background:#fff}.tour-focus{outline:3px solid #277aa7!important;outline-offset:7px;border-radius:8px;scroll-margin-top:80px;scroll-margin-bottom:330px}#tour-welcome{width:min(540px,calc(100vw - 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