/* Edition 09 — a course notebook, with topic-first navigation. */
:root{--bg:#f5f1e9;--white:#fcfaf6;--ink:#24211c;--muted:#746e64;--line:#dcd5c9;--green:#38342d;--shadow:none}
body{font-size:14px}.content{max-width:1220px;padding:38px 42px 60px}.side{background:#eee9df;padding:30px 16px;position:sticky;top:0;height:100vh}.brand{padding:0 8px 24px;border-bottom:1px solid var(--line)}.logo{font:italic 23px Georgia,serif;border-radius:2px;width:32px;height:36px}.label{color:#847c70;font-weight:500}.nav{gap:3px}.nav button{border-radius:2px;font-size:12px;padding:12px 10px;font-weight:500}.nav button:hover,.nav button.active{background:#dfd6c6;color:#24211c}.side-note{border:0;border-top:1px solid var(--line);padding:16px 8px 0;border-radius:0;font-size:11px}.top{height:58px;background:var(--bg)}.owner{gap:14px}.crumb{color:var(--muted)}
.panel,.stat,.mode,.subject{border-radius:3px;box-shadow:none}.btn{border-radius:3px;font-size:12px;min-height:42px}.btn:hover{filter:brightness(.96)}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid #87683a;outline-offset:3px}.text-button{border:0;background:none;color:var(--ink);font:inherit;font-size:12px;padding:8px 0;text-decoration:underline;text-underline-offset:4px;cursor:pointer}.title{font-size:36px;letter-spacing:-1px}.eyebrow{color:#81735e;font-size:10px;letter-spacing:1.5px}.sub{font-size:13px;max-width:750px}.section{margin:30px 0 12px;gap:14px}.section h2{font:500 23px Georgia,serif}.notebook-head{display:flex;justify-content:space-between;gap:20px;border-bottom:2px solid var(--ink);padding-bottom:23px;margin-bottom:0}.notebook-head h1{font:400 clamp(30px,3.4vw,44px)/1.1 Georgia,serif;letter-spacing:-1.2px;margin:13px 0 10px}.notebook-head p{font-size:13px;color:var(--muted);margin:0;line-height:1.6}.edition{font:12px/1.8 Georgia,serif;text-align:right;white-space:nowrap;padding-top:5px}.edition small{font:9px 'DM Sans',sans-serif;letter-spacing:1px;color:var(--muted)}
.stats{gap:0;margin:0;border-bottom:1px solid var(--line);grid-template-columns:repeat(4,minmax(0,1fr))}.stat{background:none;border:0;border-right:1px solid var(--line);padding:18px 20px;border-radius:0}.stat:first-child{padding-left:0}.stat:last-child{border-right:0}.stat small{font-size:11px}.stat strong{font:400 29px Georgia,serif;margin-top:5px}.recent-strip{margin-top:22px;border-left:3px solid #ad936c;background:#eee7db;padding:15px 18px;display:flex;justify-content:space-between;gap:16px;align-items:center}.recent-strip h2{font-size:13px;margin:0 0 5px}.recent-strip p{font-size:12px;color:var(--muted);margin:0;line-height:1.6}.index-meta{font-size:10px;text-align:right;color:var(--muted);line-height:1.6}.index-note{font-size:12px;line-height:1.65;color:var(--muted);margin:0 0 16px}.course-index{border-top:1px solid var(--ink)}.course{border-bottom:1px solid var(--line)}.course>summary{padding:21px 0;display:flex;align-items:center;gap:14px;cursor:pointer;list-style:none}.course>summary::-webkit-details-marker{display:none}.course-number{font:italic 19px Georgia,serif;color:#a29176;width:25px}.course-name{font:400 23px Georgia,serif;flex:1}.course-total{font-size:10px;color:var(--muted)}.course>summary:after{content:'+';font-size:20px;font-weight:400;margin-left:12px}.course[open]>summary:after{content:'−'}.course-description{padding:0 0 12px 39px;color:var(--muted);font-size:11px;line-height:1.7}.topic-row{display:grid;grid-template-columns:32px minmax(120px,1fr) auto;gap:10px;padding:14px 0 14px 39px;border-top:1px solid #e8e1d5;align-items:center}.topic-number{font-size:10px;color:#a19179}.topic-name{font-size:13px;font-weight:600;margin-bottom:5px}.topic-metadata{font-size:10px;color:var(--muted);line-height:1.7}.topic-actions{display:flex;gap:6px;flex-wrap:wrap}.topic-actions button{border:1px solid #d4c9b8;border-radius:2px;min-height:36px;background:transparent;color:#4b4438;font-size:11px;padding:7px 10px}.topic-actions button:first-child{background:#2b2822;color:#fcfaf6;border-color:#2b2822}.topic-actions button:hover{border-color:#8a775b}.status{display:inline-block;font-size:10px;font-weight:500;line-height:1.5;padding:3px 7px;white-space:nowrap;border-radius:2px;vertical-align:middle}.status.available{color:#46543e;background:#e6e9df}.status.pending{color:#776039;background:#eee3ca}.status.waiting{color:#7c7469;background:#e8e3da}.notebook-footer{display:flex;justify-content:space-between;gap:15px;margin-top:28px;padding-top:16px;border-top:1px solid var(--line);font-size:10px;color:var(--muted);align-items:center}
.map-intro{background:transparent;color:var(--ink);border-bottom:2px solid var(--ink);border-radius:0;padding:16px 0 22px;margin-top:0}.map-intro .map-overline{color:#887658}.map-intro h2{font-size:32px}.map-intro p{color:var(--muted);font-size:13px;max-width:680px}.badge{background:#e8e0d3;color:#6e604a;border-radius:2px}.map-outline{display:flex;gap:7px;flex-wrap:wrap;align-items:center;padding:0 0 20px;margin:0 0 10px;border-bottom:1px solid var(--line)}.map-outline .outline-label{font-size:10px;color:var(--muted);margin-right:5px}.map-outline button{border:1px solid var(--line);background:transparent;border-radius:2px;padding:9px 11px;min-height:38px;text-align:left;font-size:11px;color:#4d4539}.map-outline button:hover{background:#eee6d8}.map-branches{display:block}.map-branch{padding:0;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent}.map-branch>summary{padding:18px 0;cursor:pointer;display:flex;align-items:center;gap:12px;list-style:none}.map-branch>summary::-webkit-details-marker,.map-node>summary::-webkit-details-marker{display:none}.map-branch>summary:after{content:'+';margin-left:auto;color:#9a8565;font-size:19px}.map-branch[open]>summary:after{content:'−'}.map-branch h3{font:400 22px Georgia,serif;margin:0}.map-branch-no{min-width:70px}.map-nodes{margin:0 0 18px 31px;padding-left:24px;border-left:1px solid #cfc0aa}.map-node{padding:0;border-bottom:1px solid #e5ded2}.map-node>summary{font-size:13px;font-weight:600;padding:14px 20px 14px 0;cursor:pointer;list-style:none;position:relative}.map-node>summary:after{content:'↗';position:absolute;right:0;color:#927a55;font-weight:400}.map-node[open]>summary:after{content:'↓'}.map-node p{font-size:13px;line-height:1.8;margin:0 0 13px;max-width:760px}.map-node p span{font-weight:400}.map-node p:last-child{margin-bottom:17px}.map-check{margin-top:30px}.map-check .map-branch-head{border-bottom:1px solid var(--ink);padding-bottom:12px}.map-check h3{margin:0;font:400 23px Georgia,serif}.map-quiz{padding:12px 0;border-bottom:1px solid var(--line)}.map-quiz summary{font-size:13px;cursor:pointer;line-height:1.6}.map-quiz p{font-size:13px;line-height:1.8;color:var(--muted);padding-left:16px}.mindmap-note{font-size:11px;line-height:1.9;margin-top:25px}.mindmap-note a{color:var(--ink)}.map-tools{display:flex;gap:6px;flex-wrap:wrap}.topic-share{border:0;border-bottom:1px solid var(--line);background:transparent;padding:12px 0}.topic-share input{background:transparent}.topic-share .row{display:flex}.source-ledger{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--ink);border-bottom:1px solid var(--line);gap:30px;padding:24px 0}.ledger-label{display:block;text-transform:uppercase;letter-spacing:1px;font-size:9px;color:#938168;margin-bottom:9px}.source-ledger strong{font-size:14px}.source-ledger p{color:var(--muted);line-height:1.8;font-size:12px;margin-bottom:0}.status-legend{border-top:1px solid var(--line);padding-top:8px}.status-legend p{display:flex;gap:14px;align-items:center;font-size:12px;line-height:1.8;color:var(--muted)}.register-row{padding:13px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 1.5fr;gap:20px;font-size:12px}.register-row a{color:var(--ink);text-decoration:underline;text-underline-offset:3px}.register-row small{display:block;font-size:10px;line-height:1.8;color:var(--muted);margin-top:5px}.version-history article{display:flex;gap:24px;border-top:1px solid var(--line);padding:20px 0}.version-history article>span{font:italic 25px Georgia,serif;color:#a18a68}.version-history h3{font-size:14px;margin:0 0 7px;font-weight:600}.version-history p{font-size:12px;color:var(--muted);line-height:1.8;margin:0;max-width:750px}.release-track{padding:0;list-style:none;border-left:1px solid #b9a587;margin-left:8px}.release-track li{padding:12px 0 12px 22px;position:relative}.release-track li:before{content:'';width:7px;height:7px;background:#c3b297;border:3px solid var(--bg);border-radius:50%;position:absolute;left:-7px;top:17px}.release-track li.current:before{background:#29251f}.release-track b{font-size:12px}.release-track span{display:block;font-size:11px;line-height:1.8;color:var(--muted);margin-top:5px}
.face{border-radius:3px;background:#2d2922;box-shadow:none;font-size:21px;min-height:260px;height:auto;line-height:1.6}.face.back{background:#eae1d2}.opt,select,input{border-radius:3px}.opt{line-height:1.6}.opt.pick{border-color:#8e7650;background:#efe6d6}.bar,.bar i{border-radius:0}.bar i{background:#a48a60}.source{font-size:11px;line-height:1.8}.source a{color:#6b5736}.qmeta{line-height:1.8}.q h2{font-size:21px;line-height:1.6}.feedback{border-radius:2px;font-size:13px;line-height:1.8}.form{min-width:145px;flex:1}.form select{width:100%;max-width:100%}.row{align-items:end}.quiz{max-width:780px}.actions{gap:8px;flex-wrap:wrap}.mobile button{min-width:48px;min-height:48px}.mobile{padding-bottom:env(safe-area-inset-bottom);height:calc(60px + env(safe-area-inset-bottom));background:#f8f4ec}.log{font-size:13px;line-height:1.8}
@media(max-width:1000px){.content{padding:28px 24px}.app{grid-template-columns:200px 1fr}.topic-row{padding-left:12px}.course-name{font-size:21px}.topic-actions{max-width:200px}.topic-actions button{padding:8px}.row{gap:12px}.map-tools{margin-top:8px}}
@media(max-width:680px){.app{display:block;padding-bottom:calc(66px + env(safe-area-inset-bottom))}.content{padding:26px 18px 35px}.top{padding:0 18px}.owner{gap:10px}.owner .btn{font-size:10px;padding:8px}.owner .text-button{font-size:10px}.notebook-head{gap:12px;padding-bottom:20px}.notebook-head h1{font-size:32px;max-width:240px}.edition{font-size:10px}.edition small{font-size:8px}.stats{grid-template-columns:repeat(4,minmax(0,1fr))}.stat{padding:15px 8px}.stat small{font-size:9px}.stat strong{font-size:24px}.recent-strip{padding:14px 12px;align-items:flex-start}.recent-strip .btn{white-space:nowrap;padding:9px}.section{align-items:flex-start}.section h2{font-size:22px}.index-meta{max-width:150px}.course>summary{gap:8px;padding:20px 0}.course-name{font-size:20px}.course-total{max-width:80px;text-align:right;line-height:1.6}.course-description{padding-left:0}.topic-row{grid-template-columns:20px minmax(0,1fr);padding:15px 0;gap:8px}.topic-actions{grid-column:2;max-width:none;gap:6px}.topic-actions button{min-height:40px;flex:1}.topic-number{align-self:start;padding-top:4px}.topic-name{font-size:14px}.topic-metadata{font-size:11px}.notebook-footer{align-items:flex-start;line-height:1.7}.source-ledger{grid-template-columns:1fr;gap:22px}.register-row{grid-template-columns:1fr;gap:6px}.status-legend p{align-items:flex-start;flex-direction:column;gap:5px}.row{display:flex;flex-wrap:wrap;gap:12px}.row .form{min-width:calc(50% - 8px);width:calc(50% - 8px);flex:1}.row #start{width:100%}.map-intro{padding:14px 0 22px}.map-intro h2{font-size:29px}.map-outline{gap:6px}.map-outline .outline-label{width:100%}.map-outline button{min-width:calc(50% - 4px);flex:1;font-size:11px}.map-branch h3{font-size:21px}.map-branch-no{min-width:56px;font-size:8px}.map-nodes{margin-left:9px;padding-left:15px}.map-node p{font-size:13px}.map-tools{width:100%}.map-tools button{flex:1;min-height:44px;padding:9px;font-size:11px}.topic-share .row{display:flex;flex-wrap:wrap}.topic-share input{width:100%;flex-basis:100%}.topic-share button{width:100%}.face{padding:24px 20px;min-height:270px;font-size:19px}.face.back{font-size:17px}.actions .btn{flex:1;min-width:100px}.title{font-size:32px}.topic-share,.panel{overflow-wrap:anywhere}.qhead{gap:12px}.q h2{font-size:19px}.map-intro .badge{align-self:flex-start}.index-note{font-size:11px}}
.map-branch-title{font:400 22px Georgia,serif}.topic-comparison{margin-top:30px}.topic-comparison h3{font:400 23px Georgia,serif}.table-scroll{overflow-x:auto}.topic-comparison table{width:100%;border-collapse:collapse;font-size:12px;line-height:1.7}.topic-comparison th,.topic-comparison td{text-align:left;vertical-align:top;border-bottom:1px solid var(--line);padding:12px}.topic-comparison thead{background:#eee6d8}.topic-comparison tbody th{font-weight:600;white-space:nowrap}.topic-comparison td{color:var(--muted)}#share-status{max-width:240px;overflow-wrap:anywhere;font-size:10px}
@media(max-width:680px){.map-branch-title{font-size:21px}.topic-comparison th,.topic-comparison td{padding:10px 7px;font-size:11px}#share-status{position:absolute;right:18px;top:55px;background:var(--bg);max-width:calc(100vw - 36px);z-index:10}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.progress-transfer{margin-top:24px}.progress-transfer h2{font:400 24px Georgia,serif;margin:0 0 12px}.progress-transfer .actions{justify-content:flex-start;margin-bottom:20px}.progress-transfer .form{max-width:560px}.progress-transfer input[type=file]{padding:12px;background:var(--white);font-size:12px}.progress-transfer #confirm-import{margin-top:8px}.migration-notice:empty{display:none}.migration-notice{margin-top:20px;border:1px solid #cbb895;background:#eee3ce;padding:15px 18px;font-size:12px;line-height:1.8}.migration-notice a{color:var(--ink);font-weight:600;text-underline-offset:3px}.migration-notice button{margin-left:12px}.transfer-hint{color:var(--muted);font-size:11px}