/* Learning surfaces share the application palette and typography in both themes. */
.course-heading h1{font-size:clamp(2rem,3.4vw,3.25rem);line-height:1.12;letter-spacing:-.05em}.course-heading{align-items:center}.course-heading .page-subtitle{margin-top:17px}.course-edition{font-size:2.15rem;font-weight:700;letter-spacing:-.06em;text-align:right;white-space:nowrap}.course-edition>span{display:block;font-size:.72rem;font-weight:450;color:var(--text-secondary);letter-spacing:0;margin-top:7px}.route-hero{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:45px;padding:31px 34px;margin:34px 0 46px;background:linear-gradient(115deg,#eee7fa,#f4f0fb 65%,#f1f5e7);border:1px solid #e4d9f0;border-radius:23px}.route-hero-copy .eyebrow{font-size:.56rem}.route-hero-copy,.route-next{min-width:0}.goal-selector{display:grid;gap:8px;min-width:0}.goal-selector>span{font-size:.72rem;color:var(--text-secondary)}.goal-selector select{width:100%;min-width:0;max-width:100%;padding:11px 34px 11px 0;background:transparent;border:0;border-bottom:1px solid #ccbddf;border-radius:0;color:var(--ink);font-size:1.45rem;line-height:1.5;font-weight:650;min-height:50px;letter-spacing:-.035em}.route-hero-copy>p:not(.eyebrow){font-size:.84rem;color:var(--text-secondary);margin:16px 0 18px;line-height:1.8}.material-badge{display:inline-flex;align-items:center;background:#e6ddef;color:#6a507c;padding:5px 8px;border-radius:6px;font-size:.65rem;line-height:1.6}.paper-link{display:inline-flex;margin-left:13px;font-size:.72rem;color:#73538c;line-height:1.7;min-height:30px;align-items:center}.route-next{padding-left:30px;border-left:1px solid #ddd3e7;display:flex;flex-direction:column;align-items:flex-start}.route-next-label{font-size:.56rem;font-weight:650;letter-spacing:.12em;color:var(--text-caption);margin:3px 0 13px}.route-next h2{font-size:1.35rem;line-height:1.35}.route-next>p{font-size:.78rem;color:var(--text-secondary);line-height:1.7;margin:12px 0 20px}.route-next .button{font-size:.78rem;min-height:45px}.route-progress-copy{display:flex;justify-content:space-between;gap:10px;width:100%;margin-top:23px;margin-bottom:9px;font-size:.6rem;color:var(--text-secondary);line-height:1.6}.route-next .progress-track{height:4px}.course-map-section>.section-heading h2{font-size:1.55rem;line-height:1.35}.map-key{display:flex;align-items:center;gap:7px;color:var(--text-secondary);font-size:.67rem;flex-shrink:0}.map-key i{width:7px;height:7px;border-radius:50%;background:var(--purple)}.map-description{color:var(--text-secondary);font-size:.8rem;line-height:1.8;margin:-7px 0 28px;max-width:630px}.map-scene{position:relative;margin:0 0 32px;background-image:radial-gradient(#aaa0bb25 1px,transparent 1px);background-size:17px 17px;border-radius:18px}.map-connections{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}.map-edge{fill:none;stroke:#c9c1d4;stroke-width:1.5;vector-effect:non-scaling-stroke;opacity:.75}.map-edge.on-route{stroke:#9b7bcf;stroke-width:2;opacity:.95}.map-connections marker path{fill:#a795bd}.map-nodes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:58px 5%;position:relative}.map-node{height:174px;min-width:0;background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:20px;text-align:left;display:flex;flex-direction:column;box-shadow:0 6px 20px #33233c04;color:var(--ink);transition:border-color .16s,box-shadow .16s}.map-node:hover{border-color:#b39bd0;box-shadow:0 8px 24px #66418a0c}.map-node.on-route{border-color:#c3a9e0}.map-node.selected{border:2px solid #9f7acf;padding:19px;box-shadow:0 0 0 4px #a781d30d}.map-node-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:13px}.map-node-index{display:inline-flex;font:600 .67rem "SFMono-Regular",monospace;background:#f1eaf8;color:#8e70ad;width:26px;height:26px;border-radius:7px;justify-content:center;align-items:center}.map-node-state{font-size:.59rem;color:var(--text-secondary);line-height:1.5;text-align:right}.map-node>strong{font-size:1rem;line-height:1.32;font-weight:650;letter-spacing:-.025em;overflow-wrap:anywhere}.map-node-progress{display:flex;justify-content:space-between;gap:5px;font-size:.58rem;color:var(--text-secondary);margin-top:auto;padding-top:10px;line-height:1.5}.map-node .progress-track{height:3px;margin-top:7px}.map-node.independent .map-node-index{background:#e7efdb;color:#6b813e}.map-topic-detail{padding:28px 29px;margin-bottom:22px}.map-topic-detail .page-subtitle{font-size:.82rem;margin:0 0 21px}.map-topic-detail .panel-heading{margin-bottom:15px}.map-topic-detail h2{font-size:1.4rem}.map-topic-detail .eyebrow{font-size:.56rem}.map-lesson-list{list-style:none;padding:0;margin:0;display:grid;gap:1px}.map-lesson-list>li{border-top:1px solid var(--line);padding:5px 0 12px}.map-lesson-list>li>a{display:flex;align-items:center;gap:14px;padding:15px 0;min-height:58px}.map-lesson-list>li>a>span:nth-child(2){flex:1;min-width:0}.map-lesson-list strong{display:block;font-size:.9rem;line-height:1.55;font-weight:600}.map-lesson-list small{display:block;font-size:.71rem;line-height:1.8;color:var(--text-secondary);margin-top:4px}.lesson-route-mark{width:29px;height:29px;display:flex;align-items:center;justify-content:center;border-radius:9px;background:#f0eaf7;color:#9173b1;font-size:.85rem;flex-shrink:0}.on-route .lesson-route-mark{background:#e9ddf8;color:#74518f}.map-lesson-list>li>a>span:last-child{color:#a18bb4}.prerequisite-detail{margin-left:43px;font-size:.72rem;color:var(--text-secondary)}.prerequisite-detail summary{cursor:pointer;min-height:36px;display:flex;align-items:center;line-height:1.6;color:#7c5b96}.prerequisite-detail summary::before{content:'+';margin-right:8px}.prerequisite-detail[open] summary::before{content:'−'}.prerequisite-detail ul{padding-left:17px;margin:8px 0 0}.prerequisite-detail li{padding:6px 0;line-height:1.8}.prerequisite-detail a{color:#7b5a98;text-decoration:underline;text-underline-offset:3px}.prerequisite-detail p{margin:5px 0 0}.no-prerequisites{font-size:.7rem;color:var(--text-caption);margin:0 0 0 43px;line-height:1.8}.map-accessible-list{padding:0;margin-bottom:42px}.map-accessible-list>summary{padding:21px 25px;cursor:pointer;font-size:.85rem;line-height:1.6;font-weight:550}.map-accessible-list>section{padding:18px 25px;border-top:1px solid var(--line)}.map-accessible-list h3{font-size:1rem}.map-accessible-list ul{padding-left:20px;color:var(--text-secondary);font-size:.78rem;line-height:1.9}.map-accessible-list li+li{margin-top:9px}.map-accessible-list a{text-decoration:underline;text-underline-offset:4px;color:#785492}.goal-stages>ol{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.goal-stage{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px 16px;min-width:0}.goal-stage-number{display:block;font:500 .7rem monospace;color:#9b87ad;margin-bottom:17px}.goal-stage h3{font-size:.91rem;line-height:1.5;font-weight:650;margin-bottom:11px}.goal-stage p{font-size:.72rem;line-height:1.8;color:var(--text-secondary);margin:12px 0}.goal-stage .material-badge{font-size:.56rem}.goal-stage .text-button{font-size:.7rem;min-height:36px;display:inline-flex;align-items:center}.goal-stage.planned{background:transparent;border-style:dashed}.goal-stage.available .material-badge{background:#ecf2e1;color:#66803b}.map-footnote{color:var(--text-secondary);font-size:.72rem;line-height:1.9;margin:19px 0 10px}.demo-banner{background:#fff1c9;border:1px solid #e7cb77;border-radius:12px;padding:16px 20px;font-size:.83rem;line-height:1.8;margin-bottom:25px;color:#775e21}.map-demo-shell{max-width:1280px;margin:0 auto;padding:40px}.map-demo-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:32px}.map-demo-header strong{font-size:1.15rem}.map-demo-header button{font-size:.8rem;border:1px solid var(--line);border-radius:10px;min-height:44px;padding:10px;background:var(--surface);color:var(--ink)}
:root[data-theme="dark"] .route-hero{background:linear-gradient(115deg,#30233e,#272130 65%,#242d24);border-color:#48354f}:root[data-theme="dark"] .goal-selector select{border-color:#60496c}:root[data-theme="dark"] .goal-selector option{background:var(--surface)}:root[data-theme="dark"] .route-next{border-color:#49394f}:root[data-theme="dark"] .material-badge{background:#45324f;color:#e0c4f3}:root[data-theme="dark"] .paper-link,:root[data-theme="dark"] .map-accessible-list a,:root[data-theme="dark"] .prerequisite-detail summary,:root[data-theme="dark"] .prerequisite-detail a{color:#cfb2e9}:root[data-theme="dark"] .map-edge{stroke:#61506f}:root[data-theme="dark"] .map-edge.on-route{stroke:#ac8ad9}:root[data-theme="dark"] .map-node.on-route{border-color:#665078}:root[data-theme="dark"] .map-node.selected{border-color:#b494e2}:root[data-theme="dark"] .map-node-index,:root[data-theme="dark"] .lesson-route-mark{background:#352840;color:#c9ace4}:root[data-theme="dark"] .on-route .lesson-route-mark{background:#443052;color:#dfbfff}:root[data-theme="dark"] .map-node.independent .map-node-index,:root[data-theme="dark"] .goal-stage.available .material-badge{background:#303c25;color:#cfdfad}:root[data-theme="dark"] .demo-banner{background:#3b3220;border-color:#6b5730;color:#f0d391}
@media(max-width:1100px){.goal-stages>ol{grid-template-columns:repeat(3,minmax(0,1fr))}.map-node{padding:17px}.map-node.selected{padding:16px}.map-node-progress{flex-wrap:wrap}.map-node-state{font-size:.54rem}.route-hero{gap:25px;padding:27px}.route-next{padding-left:23px}}
@media(max-width:900px){.map-connections{display:none}.map-nodes{grid-template-columns:1fr;gap:15px}.map-node{height:auto;min-height:138px;padding:20px}.map-node.selected{padding:19px}.map-node>strong{font-size:1.1rem}.map-node-state{font-size:.69rem}.map-node-progress{font-size:.7rem;padding-top:17px}.map-node-top{margin-bottom:11px}.map-scene{padding-left:18px;background:none}.map-scene::before{content:'';position:absolute;left:0;top:30px;bottom:30px;width:1px;background:var(--line)}.map-node::before{content:'';position:absolute;left:-23px;width:11px;height:11px;border-radius:50%;background:#c4acd9;margin-top:8px;border:3px solid var(--bg)}.map-node{position:relative}.course-map-section>.section-heading{align-items:flex-start}.map-key{margin-top:6px}.course-map-section>.section-heading h2{font-size:1.4rem}.course-edition{font-size:1.7rem}.route-hero{grid-template-columns:1fr}.route-next{border-left:0;border-top:1px solid #ddd3e7;padding:23px 0 0}.route-next h2{font-size:1.35rem}.route-progress-copy{margin-top:23px;font-size:.7rem}.goal-selector select{font-size:1.4rem}.route-hero-copy>p:not(.eyebrow){font-size:.88rem}.map-lesson-list strong{font-size:.9rem}.map-lesson-list small{font-size:.73rem}}
@media(max-width:560px){.course-heading{gap:16px;align-items:flex-start}.course-heading h1{font-size:2.05rem}.course-edition{display:none}.course-heading .page-subtitle{font-size:.86rem;line-height:1.8}.route-hero{padding:25px 22px;margin:27px 0 35px;border-radius:18px;gap:22px}.goal-selector select{font-size:1.25rem;padding-right:23px}.goal-selector>span{font-size:.76rem}.route-hero-copy .eyebrow{font-size:.52rem;line-height:1.7}.route-hero-copy>p:not(.eyebrow){font-size:.84rem}.material-badge{font-size:.65rem}.paper-link{margin-left:0;margin-top:7px;margin-right:15px;min-height:44px;font-size:.78rem;display:flex}.route-next .button{width:100%;min-height:46px;font-size:.82rem}.route-next-label{font-size:.56rem}.route-progress-copy{font-size:.65rem;flex-wrap:wrap}.map-key{font-size:.65rem;white-space:normal;max-width:98px;line-height:1.6}.course-map-section>.section-heading h2{font-size:1.35rem;line-height:1.4}.map-description{font-size:.8rem;margin-bottom:22px}.map-node{padding:19px;min-height:140px;border-radius:15px}.map-node.selected{padding:18px}.map-node>strong{font-size:1.07rem}.map-node-top{gap:8px}.map-node-index{width:26px;height:26px}.map-node-state{font-size:.66rem}.map-node-progress{font-size:.66rem;line-height:1.7}.map-topic-detail{padding:24px 20px}.map-topic-detail .panel-heading{align-items:flex-start;gap:10px}.map-topic-detail h2{font-size:1.3rem;line-height:1.4}.map-topic-detail .pill{white-space:nowrap}.map-lesson-list>li>a{gap:10px;min-height:64px}.map-lesson-list strong{font-size:.88rem}.map-lesson-list small{font-size:.72rem}.prerequisite-detail{margin-left:0;font-size:.76rem}.prerequisite-detail summary{min-height:44px}.no-prerequisites{margin-left:0;font-size:.73rem}.map-accessible-list>summary{padding:20px;font-size:.81rem;min-height:60px}.map-accessible-list>section{padding:20px}.map-accessible-list ul{font-size:.82rem;overflow-wrap:anywhere}.map-accessible-list a{display:inline-block;padding:5px 0}.goal-stages>ol{grid-template-columns:1fr;gap:12px}.goal-stage{display:flex;gap:16px;padding:22px 20px}.goal-stage-number{margin:2px 0 0;font-size:.8rem}.goal-stage h3{font-size:1rem}.goal-stage .material-badge{font-size:.65rem}.goal-stage p{font-size:.8rem}.goal-stage .text-button{font-size:.8rem;min-height:44px}.map-footnote{font-size:.76rem}.map-demo-shell{padding:24px 18px}.map-demo-header{gap:14px}.map-demo-header strong{font-size:1rem}.demo-banner{padding:17px;font-size:.8rem}}
@media(prefers-reduced-motion:reduce){.map-node,.map-edge{transition:none}}

/* A lesson is read in short, resumable chapters. */
.theory-heading h1{font-size:clamp(1.9rem,2.8vw,2.65rem);max-width:940px;line-height:1.2}.theory-position-line{display:flex;justify-content:space-between;gap:15px;color:var(--text-caption);font-size:.72rem;line-height:1.7;margin:-9px 0 25px;min-height:25px}.theory-position-line button{font-size:.72rem}.theory-position-line [hidden]{display:none}.theory-layout{display:grid;grid-template-columns:205px minmax(0,1fr);gap:28px;align-items:start}.theory-toc{position:sticky;top:25px;min-width:0}.theory-toc>p{font-size:.54rem;letter-spacing:.12em;color:var(--text-caption);margin:5px 0 13px 10px;font-weight:650}.theory-toc ol{padding:0;margin:0;list-style:none;display:grid;gap:5px}.theory-toc button{display:flex;align-items:flex-start;gap:11px;min-height:45px;padding:12px 10px;border:1px solid transparent;background:transparent;border-radius:9px;text-align:left;color:var(--text-secondary);font-size:.75rem;line-height:1.6;width:100%}.theory-toc button>span{font:500 .6rem monospace;color:#a18bb2;margin-top:4px;flex-shrink:0}.theory-toc button[aria-current="step"]{background:#eae0f4;border-color:#dfcfe9;color:#67477f}.theory-practice-jump{display:flex;align-items:center;min-height:44px;font-size:.76rem;color:#7b5897;margin:16px 0 0 10px;line-height:1.8}.mobile-theory-toc{display:none}.theory-main{min-width:0}.theory-chapter{padding:29px 30px;margin-bottom:22px}.theory-chapter-top{display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:.56rem;font-weight:650;letter-spacing:.1em;color:var(--text-caption);margin-bottom:18px}.theory-chapter h2{font-size:1.6rem;line-height:1.35;margin-bottom:24px;overflow-wrap:anywhere}.theory-goal{font-size:1.04rem;line-height:1.9;color:var(--text-secondary);white-space:pre-wrap;overflow-wrap:anywhere;margin-bottom:22px}.theory-body{font-size:.95rem;line-height:1.95;color:var(--text-secondary);white-space:pre-wrap;overflow-wrap:anywhere}.theory-reading-note{padding:15px 17px;border:1px solid #e5d9ef;background:#f6f0fb;color:#7a5d90;font-size:.78rem;line-height:1.8;border-radius:10px;margin:19px 0 23px}.theory-overview-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:26px 0}.theory-overview-grid>span{font-size:.73rem;color:var(--text-secondary);padding:15px 13px;background:#f8f5fb;border-radius:9px;line-height:1.7}.theory-overview-grid strong{display:block;font-size:1.5rem;margin-bottom:4px;color:var(--ink);line-height:1.2}.theory-prerequisites{padding-top:21px;margin-top:22px;border-top:1px solid var(--line)}.theory-prerequisites h3{font-size:1rem;margin-bottom:14px}.theory-prerequisites ul{padding-left:19px;color:var(--text-secondary);font-size:.83rem;line-height:1.85}.theory-prerequisites a{color:#7b5498;text-decoration:underline;text-underline-offset:4px}.theory-prerequisites p{margin:5px 0 15px}.theory-code-label{font:500 .58rem "SFMono-Regular",monospace;color:var(--text-caption);letter-spacing:.08em;margin:25px 0 9px}.theory-code.code-block{font-size:.82rem;line-height:1.9;padding:18px;white-space:pre-wrap;overflow-wrap:anywhere}.theory-explanation-heading{font-size:1rem;margin:28px 0 14px}.theory-pitfall-label{display:inline-flex;color:#926a39;background:#faf0e0;border-radius:6px;padding:6px 8px;font-size:.61rem;margin-bottom:22px;line-height:1.7}.theory-summary{padding-left:21px;color:var(--text-secondary);font-size:.95rem;line-height:1.9}.theory-summary li+li{margin-top:13px}.theory-step-actions{display:flex;justify-content:space-between;align-items:center;gap:15px;border-top:1px solid var(--line);padding-top:23px;margin-top:29px}.theory-step-actions .button{min-height:45px;font-size:.82rem}.theory-practice{margin-bottom:22px;padding:28px 30px}.theory-practice .panel-heading{margin-bottom:16px}.theory-practice .eyebrow{font-size:.56rem}.theory-practice h2{font-size:1.3rem}.theory-practice .task-row{min-height:65px}.theory-practice .task-row-copy strong{font-size:.86rem}.theory-practice .task-row-copy small{font-size:.72rem}.theory-return{font-size:.77rem;margin:0 0 15px}.theory-sources{padding:0;margin-bottom:22px}.theory-sources summary{padding:20px 25px;font-size:.83rem;min-height:56px;line-height:1.7;cursor:pointer}.theory-sources ul{padding:0 25px 21px 44px;margin:0;color:var(--text-secondary)}.theory-sources a{display:inline-flex;align-items:center;min-height:44px;line-height:1.7;color:#795592;font-size:.8rem;text-decoration:underline;text-underline-offset:4px;overflow-wrap:anywhere}.next-lesson-card{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:24px 25px;background:#eee6f8;border:1px solid #ded1ec;border-radius:15px;margin-bottom:22px}.next-lesson-card small{font-size:.56rem;letter-spacing:.1em;color:#876c9d;display:block;margin-bottom:9px}.next-lesson-card 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/* Statistics show their denominators and never become a ranking. */
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