@font-face{font-family:Atkinson;src:url('assets/atkinson.woff2') format('woff2');font-style:normal;font-weight:400 700;font-display:swap}
:root{--blue:#153f52;--ink:#193640;--muted:#4d636b;--paper:#fffefa;--ground:#f2f3ed;--yellow:#f5cc62;--line:#c2cdc9;--green:#285f47;--soft-green:#e8f0e7;--amber:#6d4615;--soft-amber:#fff0d4;--focus:#a44b1c;--radius:12px}
*{box-sizing:border-box}html{scrollbar-color:#758d96 var(--ground);scroll-padding-top:20px}body{margin:0;background:var(--ground);color:var(--ink);font-family:Atkinson,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:18px;line-height:1.5;-webkit-text-size-adjust:100%;accent-color:var(--blue)}::selection{background:var(--yellow);color:var(--ink)}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent;touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.58}a{color:inherit;text-underline-offset:4px}button{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:4px}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.18;text-wrap:balance}h1{font-size:40px;font-weight:700;letter-spacing:-.025em}h2{font-size:27px;font-weight:650;letter-spacing:-.015em}h3{font-size:21px}p+p{margin-top:12px}svg{display:block;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.icon{width:25px;height:25px}.shell{width:min(1160px,calc(100% - 64px));margin-inline:auto}.header{background:var(--blue);color:var(--paper)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:92px}.brand{min-height:48px;display:flex;align-items:center;gap:13px;text-decoration:none;font-size:26px;font-weight:700;white-space:nowrap}.brand svg{width:37px;height:37px;color:var(--yellow);stroke-width:2.2}nav{display:flex;gap:8px}nav a{display:flex;align-items:center;justify-content:center;min-height:56px;padding:12px 19px;border-radius:8px;text-decoration:none;color:#e3edf0;font-weight:600}nav a.active{background:var(--yellow);color:var(--ink)}nav a:hover:not(.active){background:#28576b}.header :focus-visible{outline-color:var(--yellow)}#main{padding-top:38px;padding-bottom:52px;min-height:calc(100vh - 194px);outline:none}.page-head{margin-bottom:32px}.page-head p{color:var(--muted);margin-top:10px;max-width:72ch}.button,.text-button{display:inline-flex;justify-content:center;align-items:center;gap:12px;min-height:56px;padding:13px 22px;border-radius:8px;font-weight:600;text-decoration:none;border:0;line-height:1.35}.button{background:var(--yellow);color:var(--ink)}.button:hover:not(:disabled){background:#efbd42}.text-button{background:transparent;padding-inline:12px}.text-button:hover:not(:disabled){background:#e0e8e4}.actions{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-top:24px}.small{font-size:16px;line-height:1.5;color:var(--muted)}.trailhead{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}.signposts{display:flex;flex-direction:column;gap:12px}.signpost{display:flex;align-items:center;gap:18px;text-align:left;border:2px solid var(--line);border-radius:var(--radius);background:var(--paper);padding:21px 22px;min-height:102px;line-height:1.3}.signpost>span{flex:1;min-width:0}.signpost strong{font-size:25px;display:block;font-weight:650}.signpost span span{display:block;color:var(--muted);font-size:16px;margin-top:5px}.signpost>.icon:first-child{width:32px;height:32px}.signpost>.icon:last-child{width:22px}.signpost.chosen{background:var(--blue);color:var(--paper);border-color:var(--blue)}.signpost.chosen span span{color:#d1e2e7}.signpost.chosen>.icon{color:var(--yellow)}.signpost:hover:not(.chosen){border-color:var(--blue)}.briefing{padding:8px 0 0}.level-label{font-size:17px;color:var(--muted);margin-top:10px}.briefing h2{font-size:34px}.topic-list{color:var(--muted);margin-top:15px;min-height:54px}.length-picker{border:0;margin:30px 0 22px;padding:0}.length-picker legend{font-weight:600;font-size:20px;padding:0;margin-bottom:12px}.length-picker>div{display:grid;grid-template-columns:1fr 1fr;gap:12px}.length{display:flex;flex-direction:column;justify-content:center;align-items:flex-start;text-align:left;padding:15px;border:2px solid var(--line);border-radius:8px;background:transparent;min-height:95px}.length span{font-size:16px;margin-top:3px}.length.chosen{border-color:var(--blue);background:#e3ebe7}.start-button{width:100%;justify-content:space-between;min-height:65px;font-size:22px}.briefing>.small{margin-top:12px}.trail-note{display:flex;justify-content:space-between;gap:32px;margin-top:36px;padding-top:22px;border-top:1px solid var(--line);font-size:16px;color:var(--muted)}.trail-note>span{display:flex;gap:10px;align-items:center;font-weight:600;white-space:nowrap}.trail-note p{max-width:54ch}.resume{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:20px 24px;margin-bottom:30px;background:#e0eae4;border-radius:var(--radius)}.resume p{font-size:16px;color:var(--muted);margin-top:4px}.game-top{display:flex;align-items:center;justify-content:space-between;gap:24px}.game-top strong{font-size:22px}.game-top p{font-size:16px;color:var(--muted);margin-top:3px}.game-top>.text-button{flex-shrink:0}.trail-progress{display:flex;gap:6px;margin:20px 0 28px}.trail-progress span{display:flex;align-items:center;justify-content:center;flex:1;min-width:0;height:30px;border-bottom:3px solid var(--line);font-size:15px;font-variant-numeric:tabular-nums;color:var(--muted)}.trail-progress .done{border-color:var(--green);color:var(--green)}.trail-progress .current{border-color:var(--blue);background:var(--yellow);border-radius:4px 4px 0 0;color:var(--ink);font-weight:700}.challenge-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:32px;align-items:start}.challenge-layout.no-source{display:block;max-width:760px;margin-inline:auto}.source-panel{background:var(--paper);padding:24px;border-radius:var(--radius)}.source-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:20px}.source-head h2{font-size:22px}.reading-tools{display:flex;gap:2px;flex-shrink:0}.reading-tools button{display:flex;align-items:center;justify-content:center;gap:7px;background:transparent;border:0;border-radius:6px;min-height:48px;min-width:48px;font-size:16px;padding:8px}.reading-tools button:hover{background:#e3ebe7}.passage{white-space:pre-line;line-height:1.7;font-size:19px;max-width:72ch;overflow-wrap:anywhere}.answer-panel{min-width:0;padding:0 0 12px}.answer-panel h1{font-size:27px;line-height:1.25;letter-spacing:-.012em;outline:none;text-wrap:pretty}.question-stages{display:flex;gap:20px;margin-bottom:20px;font-size:16px;color:var(--muted)}.question-stages span{padding-bottom:7px;border-bottom:2px solid transparent}.question-stages .active{border-color:var(--blue);color:var(--blue);font-weight:700}.instruction{font-size:16px;color:var(--muted);margin:12px 0 20px}.options{display:grid;gap:10px}.option{display:flex;align-items:center;gap:14px;min-height:66px;width:100%;padding:15px 16px;text-align:left;background:var(--paper);border:2px solid var(--line);border-radius:10px;line-height:1.4;font-size:18px}.option>span:last-child{min-width:0;overflow-wrap:anywhere}.option-letter{font-size:16px;font-weight:700;color:var(--muted);flex-shrink:0;width:22px}.option.selected{background:#e2ece5;border-color:var(--blue)}.option.selected .option-letter{color:var(--blue)}.option:hover{border-color:var(--blue)}.question-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:18px}.question-actions .button{padding-inline:18px}.chosen-answer{display:flex;align-items:center;gap:8px;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:20px;font-size:16px}.chosen-answer p{flex:1;min-width:0}.chosen-answer .text-button{font-size:16px;max-width:115px}.hint{background:var(--soft-amber);padding:18px 20px;border-radius:8px;margin-top:20px;font-size:17px}.hint p{margin-top:5px}.feedback-status{color:var(--green);font-size:17px;font-weight:600;margin-bottom:10px}.revisit .feedback-status{color:var(--amber)}.question-recap{font-size:17px;color:var(--muted);margin-top:16px}.solution{margin:22px 0;background:var(--soft-green);padding:22px;border-radius:var(--radius);line-height:1.55}.revisit .solution{background:var(--soft-amber)}.solution h2{font-size:18px;margin-bottom:8px}.solution p+h2{margin-top:25px}.solution p{font-size:18px}.solution p+p{margin-top:10px}.next-button{margin-top:22px;width:100%;justify-content:space-between}.rest-stop{max-width:680px;margin:42px auto 80px;text-align:center}.rest-marker{width:80px;height:80px;margin:0 auto 25px;border:2px solid var(--blue);border-radius:50%;display:grid;place-items:center}.rest-marker .icon{width:38px;height:38px}.rest-stop p{margin-top:20px;font-size:21px;color:var(--muted)}.rest-stop .actions{justify-content:center;margin-top:30px}.finish{max-width:900px;margin:auto}.finish-note{padding:24px 28px;background:var(--soft-green);border-radius:var(--radius)}.finish-note>strong{font-size:24px}.finish-note p{margin-top:10px}.result-review{margin-top:48px}.result-review>p{margin-top:10px;color:var(--muted);margin-bottom:22px}.review-item{border-top:1px solid var(--line)}summary{cursor:pointer;min-height:56px;padding:16px 0;font-weight:600}summary::marker{color:var(--blue)}.review-item summary{display:flex;gap:18px;padding:22px 0}.review-item summary::after{content:'+';margin-left:auto;font-size:24px;line-height:1}.review-item[open] summary::after{content:'−'}.review-status{font-size:15px;color:var(--muted);min-width:76px;padding-top:3px}.review-body{padding:0 0 28px 94px}.review-body h3{margin:25px 0 10px}.review-passage{background:var(--paper);padding:22px;border-radius:8px}.journal{display:grid;grid-template-columns:1fr 1fr;gap:42px}.journal-subject h2{display:flex;align-items:center;gap:12px;margin-bottom:20px}.level-row{display:flex;gap:14px;align-items:center;min-height:96px;border-top:1px solid var(--line);padding:15px 0}.level-number{font-size:22px;font-weight:600;width:24px;flex-shrink:0}.level-row>div{flex:1;min-width:0}.level-row p{font-size:16px;color:var(--muted);margin-top:4px}.level-row>.icon{margin:12px}.journal-subject>.small{margin-top:16px}.explain-progress{margin-top:36px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-bottom:10px}.explain-progress p{max-width:74ch;padding-bottom:12px}.recent-trails{margin-top:38px}.recent-trails h2{margin-bottom:18px}.history-row{display:flex;justify-content:space-between;gap:24px;padding:18px 0;border-bottom:1px solid var(--line)}.history-row p{font-size:16px;color:var(--muted);margin-top:3px}.history-row>span{font-variant-numeric:tabular-nums}.parent-layout{display:grid;grid-template-columns:1fr 1fr;gap:48px}.settings-section{margin-bottom:38px}.settings-section h2{margin-bottom:15px}.settings-section>p{margin-bottom:20px}.field{display:flex;flex-direction:column;gap:8px;margin-bottom:18px;font-weight:600}.field select{width:100%;min-height:56px;background:var(--paper);border:1px solid #859b9f;border-radius:8px;padding:10px 12px;color:var(--ink);font-size:17px}.checkbox-field{flex-direction:row;align-items:center;min-height:56px;gap:14px;cursor:pointer}.checkbox-field input{width:24px;height:24px;flex-shrink:0}.reset-section{margin-top:24px}.danger{color:#882e22}.about{max-width:780px;margin:auto}.about h1{margin-bottom:20px}.about h2{margin:34px 0 14px}.about li{margin-bottom:12px}.about a{overflow-wrap:anywhere}.footer{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-block:20px;border-top:1px solid var(--line);font-size:15px;color:var(--muted)}.footer a{display:flex;align-items:center;min-height:48px}.notice{display:none;position:fixed;z-index:10;bottom:20px;left:50%;transform:translateX(-50%);max-width:min(600px,calc(100% - 32px));padding:15px 22px;border-radius:10px;background:var(--blue);color:var(--paper);box-shadow:0 8px 30px #153f5226;font-size:17px}.notice.show{display:block}.saved-warning{padding:18px;background:var(--soft-amber);margin-bottom:24px;border-radius:8px}.skip{position:absolute;left:16px;top:-100px;z-index:20;background:var(--yellow);padding:16px}.skip:focus{top:16px}.large-text .passage{font-size:23px}.large-text .option,.large-text .solution p{font-size:21px}.large-text .answer-panel h1{font-size:30px}.loading-error{padding:40px 0}.loading-error p{margin-top:20px}
@media(min-width:1050px){.source-panel{position:sticky;top:24px}.challenge-layout{gap:40px}.signpost{min-height:108px}}
@media(max-width:900px){.shell{width:calc(100% - 40px)}.header-inner{gap:12px}.brand{font-size:23px;gap:8px}nav{gap:2px}nav a{padding-inline:14px}.trailhead{gap:28px}.signpost{padding:20px 16px;gap:13px}.signpost strong{font-size:23px}.briefing h2{font-size:30px}.length-picker>div{grid-template-columns:1fr}.length{min-height:68px;padding:10px 14px}.length-picker{margin-top:24px}.topic-list{min-height:0}.source-panel{padding:19px}.challenge-layout{gap:24px;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.source-head{flex-wrap:wrap;gap:6px}.source-head h2{font-size:21px}.passage{font-size:18px;line-height:1.65}.answer-panel h1{font-size:25px}.option{font-size:17px;padding:14px 12px;gap:8px}.question-actions{flex-wrap:wrap}.question-actions .button{flex:1}.parent-layout{gap:32px}.journal{gap:30px}.level-row .text-button{padding-inline:7px}.level-row{gap:10px}}
@media(max-width:700px){.shell{width:calc(100% - 32px)}.header-inner{flex-direction:column;gap:8px;padding-top:17px;padding-bottom:8px}.brand{font-size:25px}.brand svg{width:30px;height:30px}nav{width:100%;justify-content:center}nav a{flex:1;min-height:50px;padding:10px 9px;font-size:17px}#main{padding-top:28px;padding-bottom:38px}.page-head{margin-bottom:24px}.page-head h1{font-size:31px}.page-head p{font-size:17px}.trailhead{grid-template-columns:1fr;gap:30px}.signposts{gap:9px}.signpost{min-height:86px;padding:16px;gap:16px}.signpost strong{font-size:23px}.signpost span span{font-size:15px}.briefing{padding:0}.length-picker>div{grid-template-columns:1fr 1fr}.length{min-height:96px}.trail-note{flex-direction:column;gap:12px;margin-top:28px}.trail-note>span{white-space:normal}.resume{flex-direction:column;align-items:stretch;gap:15px;padding:20px}.resume .button{width:100%}.challenge-layout{grid-template-columns:1fr;gap:26px}.source-panel{padding:20px}.source-head{flex-wrap:nowrap}.passage{font-size:19px;line-height:1.65}.game-top{gap:10px;align-items:flex-start}.game-top strong{font-size:20px}.game-top p{font-size:15px}.game-top .text-button{min-width:64px;padding:8px;gap:6px;font-size:16px}.game-top .text-button .icon{width:18px}.trail-progress{gap:3px;margin:15px 0 22px}.trail-progress span{font-size:13px}.answer-panel h1{font-size:26px}.option{font-size:18px;padding:15px 14px;gap:12px}.question-stages{margin-bottom:18px}.question-actions{gap:8px}.question-actions .text-button{font-size:16px;padding-inline:5px}.question-actions .button{font-size:17px;padding-inline:13px}.chosen-answer{align-items:flex-start}.rest-stop{margin:26px auto 50px}.rest-stop p{font-size:19px}.rest-stop .actions{flex-direction:column;align-items:stretch}.finish-note{padding:22px}.journal,.parent-layout{grid-template-columns:1fr;gap:32px}.settings-section{margin-bottom:30px}.history-row{font-size:16px;gap:14px}.review-item summary{gap:12px;font-size:17px}.review-status{min-width:63px;font-size:14px}.review-body{padding-left:0}.footer{flex-direction:column;align-items:flex-start;gap:0}.about{font-size:17px}.about h1{font-size:30px}.notice{bottom:12px;font-size:16px}.large-text .passage{font-size:22px}}
@media(prefers-reduced-motion:no-preference){.trail-progress .current{transition:background-color .22s cubic-bezier(.16,1,.3,1),border-color .22s cubic-bezier(.16,1,.3,1)}.option,.signpost,.length{transition:border-color .15s ease,background-color .15s ease}}
@media print{.header,.footer,.notice,button{display:none}.shell{width:100%}.challenge-layout,.parent-layout,.journal{display:block}.source-panel{position:static}.review-item{break-inside:avoid}body{background:white}}

.about table{width:100%;border-collapse:collapse;margin:20px 0;font-size:16px}.about th,.about td{text-align:left;vertical-align:top;padding:15px 10px;border-bottom:1px solid var(--line)}.about th{font-weight:700}.about th:first-child{width:40%}.about .back-link{margin-bottom:22px}

.about li a{display:inline-flex;align-items:center;min-height:48px}

/* Offline status uses existing surfaces and touch targets. */
[hidden]{display:none!important}.offline-link{font-size:16px;padding-inline:0;text-decoration:underline;text-underline-offset:4px}.offline-status-panel{background:var(--soft-green);padding:20px 24px;border-radius:var(--radius);margin:24px 0 18px}.offline-status-panel>strong{display:block;font-size:23px;line-height:1.25}.offline-status-panel p{margin-top:10px}.offline-panel ol{padding-left:26px}.offline-panel li{padding-left:5px;margin-bottom:16px}.offline-controls{margin-top:18px}