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var(--line);min-width:40px;height:40px;box-shadow:var(--shadow-press);border-radius:10px;font-size:1.05rem;font-weight:800}.key:active{box-shadow:none;transform:translateY(2px)}.badge{background:var(--surface-2);color:var(--ink-2);white-space:nowrap;border-radius:999px;align-items:center;gap:4px;padding:2px 8px;font-size:.72rem;font-weight:800;display:inline-flex}.badge.new{background:var(--surface-2)}.badge.learning{background:var(--accent-soft);color:var(--warning)}.badge.learned{background:var(--success-soft);color:var(--success)}.badge.primary{background:var(--primary-soft);color:var(--primary-strong)}.list{border-radius:var(--r-l);background:var(--surface);border:1px solid var(--line);flex-direction:column;display:flex;overflow:hidden}.list-item{border-top:1px solid var(--line);text-align:start;content-visibility:auto;contain-intrinsic-size:auto 60px;align-items:center;gap:12px;width:100%;min-height:60px;padding:10px 14px;display:flex}.list-item:first-child{border-top:0}.list-item .title{font-weight:750}.list-item .subtitle{color:var(--ink-2);text-overflow:ellipsis;white-space:nowrap;font-size:.875rem;overflow:hidden}.unit{flex-direction:column;gap:12px;display:flex}.unit-head{align-items:center;gap:12px;display:flex}.lesson-track{scrollbar-width:none;margin:0 calc(var(--gutter) * -1);padding:4px var(--gutter) 8px;scroll-snap-type:x proximity;gap:10px;display:flex;overflow-x:auto}.lesson-track::-webkit-scrollbar{display:none}.lesson-node{scroll-snap-align:start;border-radius:var(--r-l);background:var(--surface);border:1.5px solid var(--line);width:148px;min-height:120px;box-shadow:var(--shadow-press);text-align:start;transition:transform .15s var(--ease);flex-direction:column;flex:none;justify-content:space-between;gap:8px;padding:14px;display:flex}.lesson-node:active:not(:disabled){box-shadow:none;transform:translateY(2px)}.lesson-node.available{border-color:var(--primary);box-shadow:0 3px 0 0 var(--primary)}.lesson-node.done{background:var(--primary-soft);box-shadow:none;border-color:#0000}.lesson-node.locked{opacity:.55;box-shadow:none}.lesson-node .num{background:var(--surface-2);border-radius:10px;place-items:center;width:30px;height:30px;font-size:.85rem;font-weight:800;display:grid}.lesson-node.available .num,.lesson-node.done .num{background:var(--primary);color:var(--on-primary)}.lesson-node .lesson-title{font-size:.92rem;font-weight:750;line-height:1.25}.path{flex-direction:column;gap:4px;display:flex;position:relative}.path-level{align-items:center;gap:10px;margin:14px 0 6px;display:flex}.path-level:after{content:"";background:var(--line);flex:1;height:1px}.step-node{text-align:start;align-items:center;gap:14px;width:100%;padding:8px 4px;display:flex;position:relative}.step-node:before{content:"";background:var(--line);z-index:0;width:3px;position:absolute;top:-6px;bottom:-6px;left:31px}.step-node.first:before{top:50%}.step-node.last:before{bottom:50%}.step-node.done:before{background:var(--primary)}.step-dot{z-index:1;background:var(--surface-2);width:56px;height:56px;color:var(--ink-3);border:3px solid var(--bg);transition:transform .2s var(--ease);border-radius:50%;flex:none;place-items:center;display:grid;position:relative}.step-node.done .step-dot{background:var(--primary);color:var(--on-primary)}.step-node.available .step-dot{background:var(--accent);color:#241503;box-shadow:0 0 0 6px var(--accent-soft);animation:pulse 2.2s var(--ease) infinite}.step-node:active .step-dot{transform:scale(.94)}@keyframes pulse{0%,to{box-shadow:0 0 0 4px var(--accent-soft)}50%{box-shadow:0 0 0 10px var(--accent-soft)}}.step-node.locked .step-title{color:var(--ink-3)}.step-title{font-weight:750}.player{max-width:640px;min-height:100dvh;padding:calc(8px + env(safe-area-inset-top)) var(--gutter) 0;flex-direction:column;margin:0 auto;display:flex}.player-top{align-items:center;gap:8px;min-height:52px;display:flex}.player-top .bar{flex:1;height:14px}.player-body{padding:16px 0 calc(150px + env(safe-area-inset-bottom));animation:slide-in .35s var(--ease);flex-direction:column;flex:1;gap:20px;display:flex}@keyframes slide-in{0%{opacity:0;transform:translate(24px)}to{opacity:1;transform:none}}.prompt{letter-spacing:-.01em;font-size:1.3rem;font-weight:800}.question{border-radius:var(--r-l);background:var(--surface);border:1.5px solid var(--line);align-items:center;gap:12px;padding:16px;display:flex}.question .q-text{white-space:pre-line;font-size:1.35rem;font-weight:750}.options{gap:10px;display:grid}.option{border-radius:var(--r-m);border:2px solid var(--line);background:var(--surface);min-height:60px;box-shadow:var(--shadow-press);text-align:start;transition:transform .12s var(--ease), background .2s, border-color .2s;align-items:center;gap:12px;padding:12px 16px;font-size:1.05rem;font-weight:700;display:flex}.option .opt-key{border:1.5px solid var(--line);width:28px;height:28px;color:var(--ink-3);border-radius:8px;flex:none;place-items:center;font-size:.8rem;display:grid}.option:active:not(:disabled){box-shadow:none;transform:translateY(2px)}.option.picked{border-color:var(--primary);background:var(--primary-soft)}.option.right{border-color:var(--success);background:var(--success-soft);color:var(--success);box-shadow:none}.option.wrong{border-color:var(--error);background:var(--error-soft);color:var(--error);box-shadow:none;animation:.35s shake}@keyframes shake{25%{transform:translate(-6px)}50%{transform:translate(5px)}75%{transform:translate(-3px)}}.answer-zone{background-image:linear-gradient(var(--line) 2px, transparent 2px);background-position:0 54px;background-size:100% 58px;flex-wrap:wrap;align-content:flex-start;gap:8px;min-height:132px;padding:12px 0;display:flex}.tiles{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.tile{border:2px solid var(--line);background:var(--surface);min-height:46px;box-shadow:var(--shadow-press);animation:pop .18s var(--ease);border-radius:12px;padding:0 14px;font-size:1.05rem;font-weight:750;transition:opacity .15s}.tile:active:not(:disabled){box-shadow:none;transform:translateY(2px)}.tile.ghost{visibility:hidden}.tile.morph{color:var(--m-1)}.tile.root{color:var(--m-root)}.tile.on-ok{border-color:var(--success);color:var(--success)}.tile.on-bad{border-color:var(--error);color:var(--error)}@keyframes pop{0%{opacity:0;transform:scale(.85)}}.match-grid{grid-template-columns:1fr 1fr;gap:10px;display:grid}.match-col{flex-direction:column;gap:10px;display:flex}.match-cell{border-radius:var(--r-m);border:2px solid var(--line);background:var(--surface);min-height:56px;box-shadow:var(--shadow-press);transition:all .2s var(--ease);padding:8px 10px;font-size:.98rem;font-weight:700}.match-cell.sel{border-color:var(--primary);background:var(--primary-soft)}.match-cell.done{opacity:0;pointer-events:none;transform:scale(.9)}.match-cell.bad{border-color:var(--error);background:var(--error-soft);animation:.35s shake}.sheet{z-index:30;inset-inline:0;padding:16px var(--gutter) calc(16px + env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--line);position:fixed;bottom:0}.sheet-inner{flex-direction:column;gap:12px;max-width:640px;margin:0 auto;display:flex}.sheet.ok{background:var(--success-soft);animation:rise .25s var(--ease);border-color:#0000}.sheet.bad{background:var(--error-soft);animation:rise .25s var(--ease);border-color:#0000}.sheet.ok .sheet-title{color:var(--success)}.sheet.bad .sheet-title{color:var(--error)}.sheet-title{align-items:center;gap:8px;font-size:1.15rem;font-weight:800;display:flex}@keyframes rise{0%{transform:translateY(100%)}}.intro-card{border-radius:var(--r-xl);background:var(--surface);border:1.5px solid var(--line);box-shadow:var(--shadow-2);text-align:center;flex-direction:column;align-items:center;gap:14px;padding:28px 20px;display:flex}.example{border-radius:var(--r-m);background:var(--surface-2);text-align:start;width:100%;padding:12px 14px}.result{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:18px;padding:24px 0;display:flex}.result-stats{grid-template-columns:repeat(3,1fr);gap:10px;width:100%;display:grid}.result-stats .card{text-align:center;padding:12px 8px}.confetti{animation:pop .5s var(--ease);font-size:3.5rem}.morph{flex-wrap:wrap;align-items:baseline;font-weight:800;display:inline-flex}.morph .m{cursor:pointer;border-radius:6px;padding:0 1px;position:relative}.morph .m-root{color:var(--m-root)}.morph .m-0{color:var(--m-1)}.morph .m-1{color:var(--m-2)}.morph .m-2{color:var(--m-3)}.morph .m-3{color:var(--m-4)}.morph .sep{color:var(--ink-3);padding:0 1px;font-weight:400}.gloss{flex-wrap:wrap;gap:6px;margin-top:6px;display:flex}.gloss span{background:var(--surface-2);border-radius:999px;padding:2px 8px;font-size:.78rem;font-weight:700}.gloss .m-root{color:var(--m-root)}.gloss .m-0{color:var(--m-1)}.gloss .m-1{color:var(--m-2)}.gloss .m-2{color:var(--m-3)}.gloss .m-3{color:var(--m-4)}.theory{flex-direction:column;gap:14px;display:flex}.formula{border-radius:var(--r-l);background:var(--surface-2);flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;padding:18px 12px;font-size:1.3rem;font-weight:800;display:flex}.formula .f-root{color:var(--m-root)}.formula .f-suffix{color:var(--m-1)}.formula .f-plus{color:var(--ink-3)}.formula .f-note{color:var(--ink-2);font-size:.9rem;font-weight:600}.tip{border-radius:var(--r-m);background:var(--accent-soft);color:var(--ink);gap:10px;padding:14px;display:flex}.tip svg{color:var(--warning);flex:none;margin-top:2px}.table-wrap{border-radius:var(--r-m);border:1px solid var(--line);overflow-x:auto}table{border-collapse:collapse;background:var(--surface);width:100%;font-size:.92rem}th,td{text-align:start;border-top:1px solid var(--line);vertical-align:top;padding:10px 12px}th{background:var(--surface-2);border-top:0;font-size:.8rem;font-weight:800}.ex-list{border-radius:var(--r-m);background:var(--surface);border:1px solid var(--line);flex-direction:column;display:flex}.ex-item{border-top:1px solid var(--line);align-items:center;gap:10px;padding:10px 12px;display:flex}.ex-item:first-child{border-top:0}.dots{justify-content:center;gap:6px;display:flex}.dots span{background:var(--surface-3);width:8px;height:8px;transition:all .3s var(--ease);border-radius:999px}.dots span.on{background:var(--primary);width:22px}.empty{text-align:center;color:var(--ink-2);flex-direction:column;align-items:center;gap:12px;padding:36px 16px;display:flex}.empty .tile-icon{border-radius:22px;width:64px;height:64px}.error-box{border-radius:var(--r-m);background:var(--error-soft);color:var(--error);padding:14px;font-weight:700}.skeleton{border-radius:var(--r-l);background:linear-gradient(90deg, var(--surface-2), var(--surface-3), var(--surface-2));background-size:200% 100%;animation:1.3s linear infinite shimmer}@keyframes shimmer{to{background-position:-200% 0}}.banner{z-index:40;top:calc(10px + env(safe-area-inset-top));inset-inline:var(--gutter);border-radius:var(--r-m);background:var(--ink);max-width:600px;color:var(--bg);box-shadow:var(--shadow-2);animation:rise .3s var(--ease);align-items:center;gap:12px;margin:0 auto;padding:10px 10px 10px 16px;font-weight:700;display:flex;position:fixed}.offline-pill{color:var(--ink-3);align-items:center;gap:6px;font-size:.75rem;font-weight:700;display:inline-flex}.week{grid-template-columns:repeat(7,1fr);align-items:end;gap:6px;height:96px;display:grid}.week-col{flex-direction:column;justify-content:flex-end;align-items:center;gap:6px;height:100%;display:flex}.week-bar{background:var(--primary);width:100%;max-width:28px;min-height:4px;transition:height .5s var(--ease);border-radius:8px}.week-bar.zero{background:var(--surface-3)}.setting{border-top:1px solid var(--line);align-items:center;gap:12px;min-height:60px;padding:10px 14px;display:flex}.setting:first-child{border-top:0}.switch{flex:none;width:52px;height:32px;position:relative}.switch input{opacity:0;cursor:pointer;margin:0;position:absolute;inset:0}.switch span{background:var(--surface-3);pointer-events:none;border-radius:999px;transition:background .2s;position:absolute;inset:0}.switch span:after{content:"";width:24px;height:24px;box-shadow:var(--shadow-1);transition:transform .25s var(--ease);background:#fff;border-radius:50%;position:absolute;top:4px;left:4px}.switch input:checked+span{background:var(--primary)}.switch input:checked+span:after{transform:translate(20px)}.onboarding{max-width:520px;min-height:100dvh;padding:calc(24px + env(safe-area-inset-top)) var(--gutter) calc(24px + env(safe-area-inset-bottom));flex-direction:column;gap:24px;margin:0 auto;display:flex}.onboarding .art{flex:1;place-items:center;font-size:5rem;display:grid}.logo{letter-spacing:.04em;color:var(--primary);font-weight:900}.choice-cards{gap:10px;display:grid}.choice-card{border-radius:var(--r-l);border:2px solid var(--line);background:var(--surface);text-align:start;width:100%;box-shadow:var(--shadow-press);align-items:center;gap:14px;padding:16px;display:flex}.choice-card.on{border-color:var(--primary);background:var(--primary-soft)}.lock-note{color:var(--ink-3);align-items:center;gap:6px;font-size:.8rem;display:flex}@media (width>=720px){:root{--gutter:24px}}