:root{--blue:#254af5;--ink:#172448;--muted:#536078;--paper:#f5f7fc;--line:#dfe5f2;--lime:#daf57a;--green:#17634b;--orange:#965322;--radius:24px;font-size:16px;color-scheme:light}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}a{color:var(--blue);text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #ed971a;outline-offset:4px}button{touch-action:manipulation}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.18;letter-spacing:-.035em}h1{font-size:clamp(2rem,4vw,3rem);margin-bottom:14px}h2{font-size:1.5rem}h3{font-size:1.15rem}small{font-size:.875rem}.shell{display:flex;min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:240px;background:#fff;border-right:1px solid var(--line);padding:36px 26px;display:flex;flex-direction:column;z-index:3}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:1.65rem;line-height:1.15;letter-spacing:-.06em;font-weight:850;color:var(--ink)}.brand small{display:block;font-size:.62rem;font-weight:750;letter-spacing:.11em;margin-top:7px}.brand-icon{display:grid;place-items:center;background:var(--blue);color:white;width:42px;height:48px;border-radius:13px;flex-shrink:0;font-size:2rem;letter-spacing:0}.sidebar nav{display:grid;gap:10px;margin-top:57px}.sidebar nav a{color:var(--muted);text-decoration:none;font-weight:650;padding:12px 14px;display:flex;align-items:center;gap:12px;font-size:.94rem;border-radius:12px}.sidebar nav a.active{background:#edf1ff;color:var(--blue)}.sidebar nav a span{font-size:1.35rem}.side-note{margin-top:auto;padding-top:80px}.side-note p{font-size:.94rem;color:var(--muted);margin-top:14px}.mini-cross{display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;width:36px;height:36px;color:var(--blue);font-size:1.6rem}.workspace{margin-left:240px;width:calc(100% - 240px);padding:0 5vw}.topbar{min-height:96px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line)}.eyebrow{font-size:.75rem;font-weight:800;letter-spacing:.14em}.saved{font-size:.8rem;color:var(--muted)}main{max-width:1120px;margin:38px auto 50px;outline:none;min-height:65vh}footer{max-width:1120px;margin:0 auto;padding:20px 0 30px;border-top:1px solid var(--line);font-size:.85rem;color:var(--muted);display:flex;justify-content:space-between;gap:15px}.intro{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:24px}.intro p{color:var(--muted);margin:0}.pill{display:inline-block;padding:5px 12px;background:#e7edff;color:var(--blue);border-radius:100px;font-size:.85rem;font-weight:700}.play-layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,1fr);gap:20px}.start-card{background:var(--blue);color:#fff;border-radius:var(--radius);padding:30px;position:relative;overflow:hidden;display:flex;flex-direction:column;justify-content:space-between;min-height:287px}.start-card:after{content:"";position:absolute;width:220px;height:220px;border:42px solid #ffffff0d;border-radius:50%;right:-100px;top:25px;pointer-events:none}.start-card h2{font-size:clamp(1.8rem,3vw,2.4rem);max-width:340px;margin:22px 0 12px}.start-card p{color:#e2e8ff;margin-bottom:26px}.start-card .eyebrow{color:#d7e0ff}.btn{border:0;border-radius:13px;min-height:50px;padding:12px 20px;display:inline-flex;align-items:center;justify-content:center;gap:10px;background:var(--blue);color:white;font-weight:750;text-decoration:none;transition:transform .15s,background .15s}.btn:hover{filter:brightness(.96)}.btn:active{transform:translateY(1px)}.btn.lime{background:var(--lime);color:var(--ink)}.btn.secondary{background:white;color:var(--ink);border:1px solid var(--line)}.btn.subtle{background:#edf1ff;color:var(--blue)}.btn.full{width:100%}.btn:disabled{opacity:.55}.icon-arrow{font-size:1.25rem;margin-left:auto}.progress-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;display:flex;flex-direction:column;align-items:flex-start;justify-content:space-between}.progress-card h3{margin:0}.progress-card p{color:var(--muted);font-size:.92rem;margin:8px 0}.progress-number{font-size:3.5rem;font-weight:850;line-height:1;margin:18px 0 8px;letter-spacing:-.07em}.progress-number span{font-size:1rem;color:var(--muted);letter-spacing:0;font-weight:500}.section-label{margin:32px 0 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}.section-label h2{margin:0;font-size:1.2rem}.topic-chips{display:flex;gap:8px;flex-wrap:wrap}.chip{border:1px solid var(--line);background:white;color:var(--muted);border-radius:100px;padding:9px 16px;min-height:43px;font-size:.92rem;font-weight:650}.chip[aria-pressed="true"]{background:var(--ink);color:white;border-color:var(--ink)}.games{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:22px}.game{border:1px solid var(--line);border-radius:19px;padding:20px;background:white;text-align:left;color:var(--ink);position:relative;transition:transform .18s,box-shadow .18s}.game:hover{transform:translateY(-3px);box-shadow:0 10px 30px #1724480b}.game-icon{font-size:1.5rem;width:44px;height:44px;display:grid;place-items:center;background:#edf1ff;border-radius:12px;margin-bottom:18px;color:var(--blue)}.game:nth-child(2) .game-icon{background:#e2f5ed;color:#17634b}.game:nth-child(3) .game-icon{background:#fff0dc;color:#97521d}.game:nth-child(4) .game-icon{background:#eee7ff;color:#7444b8}.game h3{margin-bottom:9px}.game p{font-size:.89rem;color:var(--muted);margin-bottom:0}.resume{display:flex;align-items:center;justify-content:space-between;gap:15px;background:#edf1ff;border:1px solid #d4dfff;border-radius:16px;padding:15px 20px;margin-bottom:22px}.resume p{margin:0;font-size:.95rem}.quiz-wrap{max-width:760px;margin:0 auto}.quiz-top{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:20px}.text-btn{border:0;background:transparent;color:var(--muted);padding:9px 0;font-size:.94rem;font-weight:650}.steps{display:flex;gap:6px;align-items:center}.step{height:8px;width:28px;background:#dce2f0;border-radius:10px}.step.done{background:var(--green)}.step.current{background:var(--blue)}.question-card{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:32px}.question-header{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:20px}.question-card h1{font-size:clamp(1.45rem,3vw,1.95rem);line-height:1.3;letter-spacing:-.025em;margin-bottom:22px}.instruction{font-size:.95rem;color:var(--muted)}.options{display:grid;gap:10px}.answer{display:flex;gap:13px;align-items:center;text-align:left;width:100%;min-height:62px;padding:14px 18px;border:2px solid #e1e6f1;border-radius:14px;background:#fff;color:var(--ink);font-weight:600;line-height:1.45}.answer:hover:not(:disabled){background:#f6f8ff;border-color:#9aaefb}.answer .letter{display:grid;place-items:center;background:#f0f3fa;border-radius:8px;min-width:30px;height:30px;font-size:.8rem;font-weight:800;flex-shrink:0}.answer.selected{border-color:var(--blue);background:#edf1ff}.answer.correct{border-color:#3a926b;background:#eef9f2;color:#12533c}.answer.incorrect{border-color:#ca8b51;background:#fff5e9}.answer:disabled{opacity:1}.answer.correct .letter{background:#17634b;color:white}.answer.incorrect .letter{background:#965322;color:white}.quiz-actions{display:flex;gap:12px;justify-content:space-between;margin-top:20px;align-items:center}.feedback{margin-top:22px;border:1px solid #b6d9c7;border-radius:18px;padding:22px;background:#effaf3;scroll-margin:20px}.feedback.neutral{background:#fff7ed;border-color:#edccac}.feedback h2{font-size:1.18rem;margin-bottom:10px}.feedback p{margin-bottom:10px}.mnemonic{padding:12px 15px;background:#ffffffb3;border-radius:10px;font-size:.95rem}.source-note{font-size:.8rem;color:var(--muted);margin:14px 0}.question-image{width:100%;height:205px;object-fit:contain;border-radius:15px;background:#f5f6fa;margin:-2px 0 22px;display:block}.question-image.map{height:auto;max-height:460px;border:1px solid var(--line)}.zoom-link{font-size:.85rem;display:inline-block;margin:-10px 0 16px}.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.match-col{display:grid;gap:10px}.match-col .answer{font-size:.92rem;min-height:70px;justify-content:center;text-align:center;padding:12px}.match-col .matched{border-color:#93c9ad;background:#eff9f3}.match-note{color:var(--muted);min-height:1.5em;font-size:.9rem;margin:12px 0}.sort-picked{display:grid;gap:8px;margin-bottom:16px}.sort-picked .answer{background:#eef2ff;border-color:#c6d2ff}.sort-number{font-size:.85rem;font-weight:800;color:var(--blue);padding-right:4px}.finish{max-width:650px;margin:0 auto;background:white;border:1px solid var(--line);border-radius:28px;padding:36px;text-align:center}.finish-symbol{background:var(--lime);height:90px;width:90px;display:grid;place-items:center;border-radius:28px;font-size:2.8rem;margin:0 auto 24px;color:var(--ink);transform:rotate(-5deg)}.finish p{color:var(--muted)}.results{display:grid;gap:10px;text-align:left;margin:25px 0}.results details{border:1px solid var(--line);border-radius:12px;padding:13px 16px}.results summary{font-weight:650;cursor:pointer;font-size:.94rem}.results p{margin:12px 0 0;font-size:.94rem}.finish-actions{display:grid;gap:10px}.deck-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.learn-card{padding:24px;border:1px solid var(--line);border-radius:20px;background:white}.learn-card p{color:var(--muted)}.learn-card ul{padding-left:21px}.learn-card li{margin:9px 0}.learn-card h2{font-size:1.25rem}.content-sheet{background:white;padding:30px;border-radius:24px;border:1px solid var(--line)}.content-sheet h2{margin-top:28px}.content-sheet h2:first-child{margin-top:0}.content-sheet p{max-width:75ch}.table-wrap{overflow-x:auto;margin:16px 0;border:1px solid var(--line);border-radius:13px}table{width:100%;border-collapse:collapse;font-size:.94rem}th,td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:#edf1ff;font-size:.84rem}tr:last-child td{border-bottom:0}.reference-image{max-width:100%;display:block;margin:20px auto;border-radius:12px}.warning{padding:18px 20px;border-left:4px solid #bf873a;background:#fff7e9;border-radius:0 12px 12px 0;margin:20px 0}.timeline{border-left:2px solid #bdcaf8;margin:24px 0 20px 7px;padding-left:26px}.timeline article{position:relative;padding-bottom:25px}.timeline article:before{content:"";position:absolute;left:-33px;top:6px;width:12px;height:12px;background:var(--blue);border:3px solid white;border-radius:50%;box-sizing:content-box}.timeline strong{color:var(--blue)}.timeline p{margin:5px 0 0}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:24px 0}.stat{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.stat strong{display:block;font-size:2.3rem;line-height:1.3;letter-spacing:-.05em}.stat span{font-size:.9rem;color:var(--muted)}.topic-progress{display:grid;gap:16px}.progress-row{display:grid;grid-template-columns:150px 1fr 95px;gap:16px;align-items:center;font-size:.92rem}.progress-row progress{width:100%;height:9px;accent-color:var(--blue)}.badge-row{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.badge{padding:16px 19px;border:1px dashed #b7bfd1;border-radius:15px;color:var(--muted);font-size:.9rem}.badge.unlocked{border:1px solid #a5be56;background:#eff8d7;color:#354c0d}.empty{padding:30px 0;text-align:center}.skip{position:fixed;left:15px;top:-100px;background:white;padding:12px;z-index:20}.skip:focus{top:10px}.book-search{width:100%;border:1px solid var(--line);border-radius:13px;background:#fff;padding:13px 16px;margin-bottom:20px}.vocab-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.vocab-item{border:1px solid var(--line);border-radius:14px;padding:16px;text-align:center;background:white}.vocab-item img{width:100%;height:120px;object-fit:contain;margin-bottom:12px}.vocab-item p{font-size:.85rem;margin:6px 0;color:var(--muted)}.back-line{margin-bottom:22px}.inline-actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.quiet{color:var(--muted);font-size:.9rem}.storage-warning{color:#965322}.keycap{border:1px solid var(--line);border-radius:5px;padding:1px 6px}.form-label{display:block;font-size:.9rem;font-weight:650;margin-bottom:8px}.select-row{display:flex;gap:10px;align-items:center;margin-top:18px}.select-row select{min-height:44px;border:1px solid var(--line);border-radius:10px;background:white;padding:8px;color:var(--ink);max-width:100%}.reading-list{display:grid;gap:10px;margin-top:20px}.reading-list a{display:block;text-decoration:none;padding:17px 20px;background:#fff;border:1px solid var(--line);border-radius:12px;color:var(--ink);font-weight:650}.reading-list a:hover{border-color:var(--blue)}.loading{padding:40px}
@media(min-width:1500px){.workspace{padding:0 7vw}}
@media(max-width:1100px){.sidebar{width:200px;padding:28px 17px}.workspace{margin-left:200px;width:calc(100% - 200px);padding:0 4vw}.brand{font-size:1.45rem}.games{grid-template-columns:repeat(2,minmax(0,1fr))}.saved{max-width:160px;text-align:right}.play-layout{grid-template-columns:minmax(0,1.5fr) minmax(200px,1fr)}}
@media(max-width:760px){.shell{display:block}.sidebar{position:static;width:auto;border-right:0;border-bottom:1px solid var(--line);padding:18px 20px 0;background:#fff}.brand{font-size:1.45rem}.brand small{font-size:.6rem}.brand-icon{height:38px;width:36px;font-size:1.6rem;border-radius:10px}.sidebar nav{display:flex;margin-top:18px;gap:4px;justify-content:space-between}.sidebar nav a{padding:11px 8px;border-radius:10px 10px 0 0;gap:5px;font-size:.875rem}.sidebar nav a span{font-size:1rem}.side-note{display:none}.workspace{margin:0;width:auto;padding:0 20px}.topbar{min-height:50px;border:0}.topbar .eyebrow{font-size:.75rem;letter-spacing:.06em}.saved{font-size:.75rem;max-width:132px}.intro{margin-bottom:20px;align-items:start}.intro h1{font-size:2rem}.intro p{font-size:.94rem}.intro .pill{display:none}main{margin:18px auto 36px;min-height:60vh}.play-layout{grid-template-columns:1fr}.start-card{padding:24px;min-height:235px}.start-card h2{font-size:2rem;margin-top:16px}.start-card p{font-size:.95rem;margin-bottom:20px}.progress-card{padding:18px 20px;display:grid;grid-template-columns:1fr auto;gap:0 15px;border-radius:18px;align-items:center}.progress-card h3{font-size:1rem}.progress-card .progress-number{grid-column:2;grid-row:1 / span 2;margin:0;font-size:2rem}.progress-card .progress-number span{font-size:.8rem}.progress-card p{margin-bottom:0;font-size:.86rem}.progress-card a{display:none}.games{gap:12px;margin-top:18px}.game{padding:18px 16px}.game h3{font-size:1.05rem}.game p{font-size:.85rem}.game-icon{margin-bottom:14px;width:38px;height:38px}.section-label{margin-top:26px}.chip{padding:8px 13px;font-size:.88rem}.question-card{padding:22px 18px;border-radius:20px}.question-card h1{font-size:1.5rem}.question-header{margin-bottom:16px}.question-header .pill{font-size:.8rem}.question-header button{font-size:.85rem}.quiz-top{margin-bottom:16px}.answer{padding:13px;min-height:60px}.steps{gap:4px}.step{width:22px}.quiz-actions{gap:10px}.feedback{padding:18px 16px}.feedback p{font-size:.96rem}.question-image{height:165px}.finish{padding:27px 20px}.resume{padding:14px;align-items:flex-start}.resume p{font-size:.85rem}.resume .btn{padding:9px 13px;min-height:44px;font-size:.85rem}.deck-grid{grid-template-columns:1fr}.content-sheet{padding:22px 18px}.stats{gap:8px}.stat{padding:15px 10px}.stat strong{font-size:1.8rem}.stat span{font-size:.79rem}.progress-row{grid-template-columns:100px 1fr 66px;gap:8px;font-size:.8rem}.vocab-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.vocab-item{padding:12px}.vocab-item img{height:105px}footer{display:block;font-size:.8rem}footer a{display:block;margin-top:8px}.text-btn{min-height:44px}.match-col .answer{font-size:.86rem;padding:9px;min-height:75px}.match-grid{gap:8px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.sidebar,.topbar,footer,.back-line,.inline-actions,.book-search{display:none!important}.workspace{margin:0;padding:0;width:100%}body{background:white}.content-sheet{border:0;padding:0}main{margin:0;max-width:none}a{color:inherit}.vocab-item{break-inside:avoid}h2,h3{break-after:avoid}tr{break-inside:avoid}}