:root{--ink:#17231e;--muted:#68726c;--paper:#f4f0e7;--card:#fffdf8;--raised:#fff;--dark:#718268;--light:#e7d9ba;--line:#ddd6c9;--soft:#ede7da;--accent:#c75d36;--accent-dark:#9d452b;--maia:#4f775f;--engine:#56627c;--good:#467353;--warn:#a66a24;--bad:#a24335;--sidebar:248px;--bar:68px;--shadow:0 12px 36px #382b1b12}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--paper);color:var(--ink);font:15px/1.45 ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}a{color:inherit;text-decoration:none}[hidden]{display:none!important}.brand-mark{display:grid;place-items:center;width:48px;height:48px;border-radius:15px;background:var(--accent);color:#fff;font:700 27px Georgia,serif;box-shadow:0 7px 16px #9d452b2b}.brand-mark.small{width:36px;height:36px;border-radius:11px;font-size:20px}.center-card{width:min(430px,calc(100% - 32px));margin:20vh auto;text-align:center}.center-card .brand-mark{margin:auto}.center-card h1{font:700 31px Georgia,serif;margin:18px 0 5px}.center-card p,.muted{color:var(--muted)}.login-view{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at 70% 20%,#e4d5b8 0,transparent 36%),var(--paper)}.login-card{width:min(420px,100%);display:grid;gap:22px;background:var(--card);border:1px solid var(--line);border-radius:22px;padding:32px;box-shadow:var(--shadow)}.login-brand,.product{display:flex;align-items:center;gap:12px}.login-brand div,.product>span:last-child{display:flex;flex-direction:column}.login-brand strong,.product strong{font:700 20px Georgia,serif}.login-brand small,.product small{color:var(--muted);font-size:10px;letter-spacing:.08em;text-transform:uppercase}.login-card h1{margin:0;font:700 30px Georgia,serif}.login-card p{margin:5px 0 0;color:var(--muted)}label{display:grid;gap:6px;font-weight:650;font-size:13px}input,select,textarea{width:100%;border:1px solid var(--line);border-radius:8px;background:#fffefa;padding:10px 11px;outline:none}input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px #c75d3622}textarea{resize:vertical;line-height:1.5}.form-error{min-height:20px;margin:0!important;color:var(--bad)!important}.primary,.secondary,.icon-button,.account-button,.link-button,.nav-item,.file-action{border-radius:8px;padding:9px 13px}.primary{border:1px solid var(--accent);background:var(--accent);color:#fff;font-weight:700}.primary:hover{background:var(--accent-dark)}.secondary,.file-action{border:1px solid var(--line);background:var(--card);font-weight:650}.large{min-height:48px}.icon-button{border:0;background:transparent;font-size:19px;line-height:1}.link-button{border:0;background:transparent;color:var(--accent);font-weight:700;padding:4px}.file-action{position:relative;display:inline-flex;align-items:center}.file-action input{position:absolute;inset:0;opacity:0;cursor:pointer}.studio{min-height:100vh}.appbar{position:fixed;z-index:30;inset:0 0 auto 0;height:var(--bar);display:flex;align-items:center;gap:28px;padding:0 20px;border-bottom:1px solid var(--line);background:#fbf9f4eF;backdrop-filter:blur(16px)}.product{width:calc(var(--sidebar) - 20px)}.course-identity{display:flex;align-items:center;gap:10px;min-width:0}.course-identity>span:first-child{font:700 18px Georgia,serif;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.save-state{border-radius:99px;background:var(--soft);color:var(--muted);padding:3px 8px;font-size:11px;font-weight:700}.save-state.dirty{background:#fff0d6;color:var(--warn)}.save-state.saving{background:#e6edf4;color:var(--engine)}.appbar-actions{margin-left:auto;display:flex;align-items:center;gap:8px}.account-button{display:flex;align-items:center;gap:8px;border:0;background:transparent}.account-button>span:first-child{display:grid;place-items:center;width:31px;height:31px;border-radius:50%;background:var(--dark);color:white;font-weight:800}.account-menu{position:fixed;z-index:40;right:18px;top:60px;width:220px;padding:13px;background:var(--raised);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow)}.account-menu span{display:block;color:var(--muted);font-size:12px;padding:5px 8px 10px;overflow:hidden;text-overflow:ellipsis}.account-menu button{width:100%;border:0;border-top:1px solid var(--line);background:transparent;text-align:left;padding:10px 8px}.sidebar{position:fixed;z-index:20;left:0;top:var(--bar);bottom:0;width:var(--sidebar);display:flex;flex-direction:column;padding:18px 13px;background:#ede8dd;border-right:1px solid var(--line);overflow:auto}.sidebar nav{display:grid;gap:4px}.nav-item{display:flex;align-items:center;gap:11px;width:100%;border:0;background:transparent;text-align:left;color:#4d5751;font-weight:600}.nav-item>span{width:20px;text-align:center;font-size:17px}.nav-item:hover{background:#fff8}.nav-item.active{background:var(--card);color:var(--ink);box-shadow:0 2px 8px #392b180b}.nav-item i{margin-left:auto;min-width:20px;border-radius:99px;background:#dbc4ac;color:var(--bad);font-style:normal;text-align:center;font-size:11px}.nav-label{margin:21px 12px 5px;color:#8d918c;font-size:10px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.sidebar-note{margin:auto 10px 0;padding-top:20px;color:var(--muted);font-size:11px}.content{margin-left:var(--sidebar);padding:calc(var(--bar) + 34px) 38px 60px;min-height:100vh}.view{display:none;max-width:1220px;margin:0 auto}.view.active{display:block}.page-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:30px;margin-bottom:27px}.page-heading.compact{margin-bottom:20px}.page-heading h1{margin:0;font:700 clamp(28px,3vw,38px) Georgia,serif;letter-spacing:-.02em}.page-heading p:not(.eyebrow){margin:6px 0 0;color:var(--muted)}.eyebrow{margin:0 0 5px;color:var(--accent);font-size:10px;font-weight:800;letter-spacing:.13em;text-transform:uppercase}.heading-actions{display:flex;gap:9px;flex-wrap:wrap}.stat-strip{display:flex;gap:1px;margin-bottom:22px;border:1px solid var(--line);border-radius:11px;background:var(--line);overflow:hidden}.stat{flex:1;min-width:120px;padding:13px 17px;background:var(--card)}.stat strong{display:block;font:700 22px Georgia,serif}.stat span{color:var(--muted);font-size:11px}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:15px}.course-card,.loading-card{background:var(--card);border:1px solid var(--line);border-radius:13px;padding:19px;box-shadow:0 4px 14px #392b1808}.course-card{display:grid;gap:15px;text-align:left;cursor:pointer}.course-card:hover{border-color:#bea98b;transform:translateY(-1px)}.course-card header{display:flex;justify-content:space-between;gap:15px}.course-card h2{margin:0;font:700 22px Georgia,serif}.course-card p{margin:4px 0 0;color:var(--muted)}.course-meta{display:flex;gap:13px;color:var(--muted);font-size:11px}.tag{display:inline-flex;border-radius:99px;padding:4px 8px;background:var(--soft);color:var(--muted);font-size:10px;font-weight:750;white-space:nowrap}.tag.live{background:#e4efe6;color:var(--good)}.tag.draft{background:#fff0d6;color:var(--warn)}.form-card,.tool-card{background:var(--card);border:1px solid var(--line);border-radius:13px;padding:20px;box-shadow:0 4px 14px #392b1808}.two-column{display:grid;grid-template-columns:1fr 1fr;gap:18px}.span-two{grid-column:span 2}label small{color:var(--muted);font-weight:400}.editor-layout{display:grid;grid-template-columns:minmax(340px,610px) minmax(330px,1fr);gap:25px;align-items:start}.board-pane{position:sticky;top:calc(var(--bar) + 22px);min-width:0}.chessboard{width:100%;max-width:610px;aspect-ratio:1;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));overflow:hidden;border:1px solid #594d3b33;border-radius:8px;box-shadow:var(--shadow);touch-action:none}.chessboard.small{max-width:390px}.chessboard .square{position:relative;display:grid;place-items:center;min-width:0;min-height:0;overflow:hidden;border:0;border-radius:0;padding:0}.chessboard .light{background:var(--light)}.chessboard .dark{background:var(--dark)}.chessboard .piece{display:block;width:84%;height:84%;object-fit:contain;pointer-events:none;user-select:none;position:relative;z-index:2}.chessboard .selected{box-shadow:inset 0 0 0 4px #d49c38}.chessboard .target:after{content:"";position:absolute;z-index:3;width:21%;aspect-ratio:1;border-radius:50%;background:#d49c38cc}.chessboard .capture:after{width:77%;background:transparent;border:4px solid #d49c38cc}.chessboard .coord{position:absolute;font:bold 9px system-ui;z-index:4;opacity:.7}.chessboard .rank{top:2px;left:3px}.chessboard .file{right:3px;bottom:2px}.board-controls{display:grid;grid-template-columns:repeat(4,1fr) 1.5fr 1fr;gap:7px;margin-top:10px}.board-controls button{min-height:42px;border:1px solid var(--line);border-radius:8px;background:var(--card)}.author-pane{display:grid;gap:14px;min-width:0}.card-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:15px;margin-bottom:15px}.card-heading h2{margin:0;font:700 21px Georgia,serif}.card-heading p{margin:3px 0 0;color:var(--muted);font-size:12px}.move-tree{display:flex;align-items:center;flex-wrap:wrap;gap:5px;line-height:1.8;max-height:260px;overflow:auto}.move-chip{border:0;background:transparent;border-radius:6px;padding:3px 6px;color:var(--muted);font:650 13px ui-monospace,monospace}.move-chip:hover{background:#e7d9ba66}.move-chip.current{background:var(--accent);color:#fff}.variation{display:inline-flex;align-items:center;flex-wrap:wrap;gap:3px;border-radius:7px;padding:1px 4px;background:var(--paper);color:#8a8073}.inspector-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:13px}.inspector-head h2{margin:0;font:700 23px Georgia,serif}.inspector-actions{display:flex;gap:6px}.inspector-actions button{border:1px solid var(--line);border-radius:7px;background:transparent;padding:6px 8px}.danger{color:var(--bad)}.wrong-list{display:grid;gap:8px}.wrong-row{display:grid;grid-template-columns:84px 1fr auto;align-items:start;gap:8px}.wrong-row input{min-width:0}.wrong-row button{border:0;background:transparent;color:var(--bad);padding:9px 5px}.empty-state{padding:20px;text-align:center;color:var(--muted)}.empty-state strong{color:var(--ink)}.analysis-position{display:flex;justify-content:space-between;align-items:center;margin:-8px 0 18px;padding:10px 14px;border:1px solid var(--line);border-radius:9px;background:var(--card)}.move-path{font:650 13px ui-monospace,monospace}.analysis-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px}.accent-maia{border-top:3px solid var(--maia)}.accent-engine{border-top:3px solid var(--engine)}.suggestion-list{display:grid;gap:8px}.suggestion-row{display:grid;grid-template-columns:38px minmax(80px,auto) 1fr auto;align-items:center;gap:10px;padding:10px;border:1px solid var(--line);border-radius:8px;background:#faf8f1}.suggestion-row .move{font:700 18px Georgia,serif}.suggestion-row .meter{height:5px;border-radius:4px;background:var(--soft);overflow:hidden}.suggestion-row .meter i{display:block;height:100%;background:var(--maia)}.suggestion-row button{border:1px solid var(--line);border-radius:6px;background:var(--card);padding:6px 8px;font-size:11px}.gap-card{margin-top:17px}.quality-list{display:grid;gap:9px}.quality-item{display:grid;grid-template-columns:28px 1fr auto;gap:10px;align-items:start;padding:13px 15px;border:1px solid var(--line);border-radius:9px;background:var(--card)}.quality-icon{display:grid;place-items:center;width:24px;height:24px;border-radius:50%;font-weight:900}.quality-item.blocker .quality-icon{background:#f3d9d4;color:var(--bad)}.quality-item.warning .quality-icon{background:#f6e8c9;color:var(--warn)}.quality-item.good .quality-icon{background:#dfece1;color:var(--good)}.quality-item h3{margin:0;font-size:14px}.quality-item p{margin:2px 0 0;color:var(--muted);font-size:12px}.quality-item button{border:0;background:transparent;color:var(--accent);font-weight:700}.chapter-layout{display:grid;grid-template-columns:minmax(380px,1fr) minmax(280px,390px);gap:22px;align-items:start}.chapter-preview{position:sticky;top:calc(var(--bar) + 20px)}.chapter-timeline{display:grid;gap:2px}.studio-chapter{border:1px solid var(--line);border-radius:10px;background:var(--card);overflow:hidden}.studio-chapter+.studio-chapter{margin-top:11px}.studio-chapter-head{display:grid;grid-template-columns:auto 1fr auto auto;align-items:center;gap:9px;padding:10px;background:#ece6da;cursor:grab}.studio-chapter-head input{background:transparent;border:0;font:700 17px Georgia,serif;padding:5px}.chapter-count{font-size:11px;color:var(--muted)}.chapter-count.outside{color:var(--warn);font-weight:800}.chapter-position-row{display:grid;grid-template-columns:44px 1fr auto;gap:8px;align-items:center;width:100%;padding:9px 12px;border:0;border-top:1px solid var(--line);background:var(--card);text-align:left}.chapter-position-row:hover,.chapter-position-row.selected{background:#faf3e7}.chapter-drop{height:22px;display:grid;place-items:center;border:1px dashed transparent;color:transparent;font-size:10px}.chapter-drop.active,.chapter-timeline.adding .chapter-drop{height:32px;border-color:#c89f73;color:var(--accent);background:#fff9ed}.preview-layout{display:grid;grid-template-columns:minmax(340px,610px) minmax(300px,1fr);gap:24px;align-items:start}.learner-card{position:sticky;top:calc(var(--bar) + 20px)}.learner-card h2{font:700 25px Georgia,serif}.learner-answer{display:flex;align-items:center;gap:12px;padding:13px;border-radius:9px;background:#e5ede4}.learner-answer strong{font:700 22px Georgia,serif}.history-list{display:grid;gap:10px}.history-row{display:grid;grid-template-columns:1fr auto;gap:18px;padding:16px 18px;border:1px solid var(--line);border-radius:11px;background:var(--card)}.history-row h2{margin:0;font:700 19px Georgia,serif}.history-row p{margin:5px 0;color:var(--muted);font-size:12px}.history-row button{align-self:center}.toast{position:fixed;z-index:80;right:24px;bottom:24px;max-width:390px;padding:12px 16px;border-radius:9px;background:#26342d;color:#fff;box-shadow:var(--shadow)}.toast.error{background:var(--bad)}dialog{border:0;border-radius:16px;padding:0;background:transparent;box-shadow:var(--shadow)}dialog::backdrop{background:#1a221d66;backdrop-filter:blur(3px)}.dialog-card{width:min(500px,calc(100vw - 32px));display:grid;gap:17px;margin:0;padding:24px;background:var(--card)}.dialog-heading{display:flex;justify-content:space-between;align-items:start}.dialog-heading h2{margin:0;font:700 27px Georgia,serif}.dialog-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:5px}.publish-dialog{width:min(650px,calc(100vw - 32px))}
@media(max-width:980px){:root{--sidebar:210px}.content{padding-left:26px;padding-right:26px}.editor-layout,.preview-layout{grid-template-columns:minmax(310px,1fr) minmax(300px,1fr)}.analysis-grid{grid-template-columns:1fr}.chapter-layout{grid-template-columns:1fr}.chapter-preview{position:static}.appbar{gap:10px}.course-identity{display:none!important}}
@media(max-width:760px){:root{--bar:58px}.appbar{padding:0 10px}.product{width:auto}.product>span:last-child,.account-button>span:last-child,.appbar .icon-button{display:none}.sidebar{position:fixed;top:auto;bottom:0;right:0;width:auto;height:61px;padding:5px 7px;border:0;border-top:1px solid var(--line);overflow-x:auto;overflow-y:hidden}.sidebar nav{display:flex;min-width:max-content}.sidebar #course-navigation{display:flex!important}.sidebar .nav-label,.sidebar-note,.nav-item[data-view=details],.nav-item[data-view=history]{display:none}.nav-item{width:62px;display:grid;place-items:center;gap:0;padding:5px 3px;font-size:8px}.nav-item>span{font-size:18px}.nav-item i{position:absolute;margin:0 0 19px 27px}.content{margin:0;padding:calc(var(--bar) + 22px) 14px 86px}.page-heading{display:grid;gap:14px;margin-bottom:19px}.page-heading h1{font-size:29px}.heading-actions{width:100%}.editor-layout,.preview-layout{grid-template-columns:1fr}.board-pane{position:static}.author-pane{gap:10px}.chessboard{width:min(100%,calc(100vw - 28px));max-width:none}.analysis-grid{grid-template-columns:1fr}.chapter-layout{grid-template-columns:minmax(0,1fr)}.two-column{grid-template-columns:1fr}.span-two{grid-column:auto}.stat-strip{overflow-x:auto}.stat{min-width:130px}.course-grid{grid-template-columns:1fr}.suggestion-row{grid-template-columns:32px 70px 1fr}.suggestion-row button{grid-column:2/4}.wrong-row{grid-template-columns:70px 1fr auto}.appbar-actions{gap:5px}.appbar-actions .primary,.appbar-actions .secondary{padding:8px 9px}.account-menu{top:52px}.chapter-preview{padding:13px}.chapter-preview .chessboard{width:100%}}
.checkbox-label{display:flex;align-items:center;gap:9px;align-self:end;min-height:42px}.checkbox-label input{width:18px;height:18px;accent-color:var(--accent)}

/* Course Studio hardening: accessibility, touch authoring and compact layouts. */
:root{--accent:#a94b2d;--accent-dark:#823620;--maia:#426b52;--engine:#4d5870;--good:#396543;--warn:#865217;--bad:#913629}
button{min-height:44px}
.course-card{width:100%;color:inherit;font:inherit}
.course-card:focus-visible{outline:3px solid #a94b2d55;outline-offset:2px}
.course-card-head{display:flex;justify-content:space-between;gap:15px}.course-card-head>span:first-child{display:grid}.course-card-title{font:700 22px Georgia,serif}.course-card-description{margin-top:4px;color:var(--muted)}
.studio-chapter-head{grid-template-columns:auto minmax(120px,1fr) auto auto auto}
.boundary-controls{display:flex;gap:3px}
.boundary-controls button{min-width:40px;min-height:40px;border:1px solid var(--line);border-radius:7px;background:var(--card)}
.chapter-drop{min-height:18px;height:auto}
.chapter-drop.active,.chapter-timeline.adding .chapter-drop,.chapter-drop:focus-visible{min-height:40px;height:auto;border-color:#9d7147;color:var(--accent);background:#fff9ed}
.chapter-drop[aria-pressed=true]{min-height:30px;color:var(--accent)}
.learner-answer{align-items:flex-start}
.learner-answer.wrong{background:#f4dfda}
.learner-answer.pending{background:var(--soft);color:var(--muted)}
.wide-dialog{width:min(900px,calc(100vw - 32px))}
.wide-dialog textarea{font:13px/1.45 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre}
.inline-control{display:flex;align-items:center;gap:8px}
.inline-control select{min-width:180px}
.quality-actions{display:flex;gap:7px;flex-wrap:wrap;margin-top:8px}
.quality-context{display:flex;gap:12px;flex-wrap:wrap;margin-top:5px;color:var(--muted);font-size:11px}
.change-list,.warning-list{display:grid;gap:7px;margin:12px 0;padding:0;list-style:none}
.change-list li,.warning-list li{padding:9px 11px;border-radius:8px;background:var(--paper)}

@media(max-width:980px){.course-identity{display:flex!important;max-width:220px}}
@media(max-width:760px){:root{--bar:104px}.appbar{padding:2px 8px;display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-rows:44px 52px;gap:2px 8px}.product{width:auto}.product>span:last-child,.account-button>span:last-child{display:none}.course-identity{display:flex!important;min-width:0;gap:4px}.course-identity>span:first-child{font-size:14px}.appbar .icon-button{display:inline-grid;padding:6px}.appbar-actions{grid-column:1/3;grid-row:2;width:100%;justify-content:flex-end;gap:4px}.appbar-actions .primary,.appbar-actions .secondary{font-size:12px;padding:7px}.sidebar{height:67px}.sidebar .nav-item[data-view=details],.sidebar .nav-item[data-view=history]{display:grid}.content{padding-top:calc(var(--bar) + 22px);padding-bottom:92px}.account-menu{top:98px}.studio-chapter-head{grid-template-columns:auto minmax(100px,1fr) auto}.studio-chapter-head .chapter-count{grid-column:2}.boundary-controls{grid-column:2/4}.history-row{grid-template-columns:1fr}.inline-control{width:100%}.inline-control select{min-width:0}}

/* Round-two accessibility and narrow-layout review. */
:root{--muted:#4f5b55}
.nav-label{color:#626b65}
.variation{color:#5b625d}
.chapter-position-row{grid-template-columns:70px minmax(0,1fr) auto}
.chapter-position-row>span:nth-child(2){min-width:0;overflow-wrap:anywhere}
.chapter-position-row small{display:block;margin-top:2px;color:var(--muted)}
@media(max-width:760px){
  .stat-strip{overflow:visible}
  .stat{min-width:0;padding:12px}
  .stat span{overflow-wrap:anywhere}
  .chapter-position-row{grid-template-columns:minmax(0,1fr) auto;gap:5px 10px;padding:11px 12px}
  .chapter-position-row>span:first-child{grid-column:1/3;color:var(--muted);font-size:11px}
  .chapter-position-row>span:nth-child(2){grid-column:1}
  .chapter-position-row>strong{grid-column:2;grid-row:2;align-self:start}
}