.btn{--btn-bg:var(--feather);--btn-edge:var(--feather-dark);--btn-fg:#fff;--btn-hover:var(--feather-hover);--btn-h:50px;--btn-lift:var(--edge);min-height:var(--btn-h);border-radius:var(--radius-lg);background:var(--btn-bg);color:var(--btn-fg);font-weight:800;font-size:var(--fs-label);letter-spacing:var(--ls-label);text-transform:uppercase;white-space:nowrap;cursor:pointer;-webkit-user-select:none;user-select:none;touch-action:manipulation;box-shadow:0 var(--btn-lift) 0 var(--btn-edge);margin-bottom:var(--btn-lift);transition:transform var(--dur-fast) var(--ease),box-shadow var(--dur-fast) var(--ease),background var(--dur-fast),color var(--dur-fast);border:0;justify-content:center;align-items:center;gap:8px;padding:0 16px;line-height:1;display:inline-flex;position:relative;transform:translateY(0)}@media (hover:hover){.btn:hover{background:var(--btn-hover)}}.btn:active,.btn.is-pressed{transform:translateY(var(--btn-lift));box-shadow:0 0 0 var(--btn-edge)}.btn:focus-visible{outline:3px solid var(--macaw);outline-offset:3px}.btn:disabled,.btn[aria-disabled=true]{--btn-bg:var(--swan);--btn-edge:var(--swan);--btn-fg:var(--hare);--btn-hover:var(--swan);cursor:not-allowed;box-shadow:none;margin-bottom:var(--btn-lift);transform:none}.btn.secondary{--btn-bg:var(--snow);--btn-edge:var(--swan);--btn-fg:var(--macaw);--btn-hover:var(--polar);--btn-lift:2px;border:var(--border) solid var(--swan)}.btn.secondary:disabled{--btn-fg:var(--hare);border-color:var(--swan)}.btn.secondary.gray{--btn-fg:var(--hare)}.btn.danger{--btn-bg:var(--cardinal);--btn-edge:var(--cardinal-dark);--btn-hover:#ff5c5c}.btn.blue{--btn-bg:var(--macaw);--btn-edge:var(--macaw-dark);--btn-hover:#2ebafa}.btn.yellow{--btn-bg:var(--bee);--btn-edge:var(--bee-dark);--btn-hover:#ffd11a;--btn-fg:var(--eel)}.btn.white{--btn-bg:var(--snow);--btn-edge:#00000024;--btn-fg:var(--feather-dark);--btn-hover:#f4fff0}.btn.ghost{--btn-bg:var(--polar);--btn-edge:var(--swan);--btn-fg:var(--macaw);--btn-hover:#efefef;--btn-lift:2px}.btn.sm{--btn-h:40px;border-radius:var(--radius);padding:0 14px;font-size:13px}.btn.lg{--btn-h:54px;padding:0 24px;font-size:17px}.btn.full{width:100%;display:flex}.btn.icon-only{width:var(--btn-h);padding:0}.btn .btn-ico{font-size:1.35em;line-height:1;display:inline-flex}.card{background:var(--snow);border:var(--border) solid var(--swan);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);color:var(--text);transition:background var(--dur-fast),border-color var(--dur-fast),color var(--dur-fast),transform var(--dur-fast) var(--ease),box-shadow var(--dur-fast) var(--ease);padding:16px}.card.tint-green{background:var(--feather-light);border-color:var(--feather-edge);box-shadow:0 2px 0 var(--feather-edge)}.card.tint-blue{background:var(--macaw-light);border-color:var(--macaw-edge);box-shadow:0 2px 0 var(--macaw-edge)}.card.tint-yellow{background:var(--bee-light);border-color:var(--bee-edge);box-shadow:0 2px 0 var(--bee-edge)}.card.tint-purple{background:var(--beetle-light);border-color:var(--beetle-edge);box-shadow:0 2px 0 var(--beetle-edge)}.card.tint-red{background:var(--cardinal-light);border-color:var(--cardinal-edge);box-shadow:0 2px 0 var(--cardinal-edge)}.card.clickable{cursor:pointer;-webkit-user-select:none;user-select:none}@media (hover:hover){.card.clickable:hover{background:var(--polar)}}.card.clickable:active{box-shadow:none;transform:translateY(2px)}.card.selected{border-color:var(--macaw-edge);background:var(--macaw-light);box-shadow:0 2px 0 var(--macaw-edge);color:var(--macaw-dark)}.card.correct{border-color:var(--feather-edge);background:var(--feather-light);color:var(--feather-dark);box-shadow:0 2px 0 var(--feather-edge)}.card.wrong{border-color:var(--cardinal-edge);background:var(--cardinal-light);color:var(--cardinal-dark);box-shadow:0 2px 0 var(--cardinal-edge)}.card.selected.clickable:hover,.card.correct.clickable:hover,.card.wrong.clickable:hover{background:inherit}.card.solid{color:#fff;box-shadow:0 var(--edge) 0 var(--card-edge);margin-bottom:var(--edge);border:0}.card.solid-green{--card-edge:var(--feather-dark);background:var(--feather)}.card.solid-blue{--card-edge:var(--macaw-dark);background:var(--macaw)}.card.solid-yellow{--card-edge:var(--bee-dark);background:var(--bee)}.card.solid-orange{--card-edge:var(--fox-dark);background:var(--fox)}.card.solid-purple{--card-edge:var(--beetle-dark);background:var(--beetle)}.card.solid-gray{--card-edge:var(--hare);background:var(--swan);color:var(--wolf)}.card.solid .eyebrow{font-size:var(--fs-label);letter-spacing:var(--ls-label);text-transform:uppercase;opacity:.8;font-weight:800}.card.solid h2,.card.solid h3{color:inherit}.card.solid.clickable:active{transform:translateY(var(--edge));box-shadow:none}.statcard{--sc:var(--bee);--sc-fg:var(--bee);border:var(--border) solid var(--sc);border-radius:var(--radius-lg);background:var(--sc);min-width:118px;animation:pop-in var(--dur-slow) var(--spring) both;flex-direction:column;flex:1;display:flex;overflow:hidden}.statcard-label{color:#fff;font-size:var(--fs-label);letter-spacing:var(--ls-label);text-transform:uppercase;text-align:center;padding:6px 10px;font-weight:800;line-height:20px}.statcard-body{background:var(--snow);min-height:72px;color:var(--sc-fg);font-size:var(--fs-title);font-variant-numeric:tabular-nums;border-radius:14px;justify-content:center;align-items:center;gap:8px;margin:0;padding:12px;font-weight:800;display:flex}.statcard-body .ico{font-size:26px;line-height:1}.statcard.green{--sc:var(--feather);--sc-fg:var(--feather-dark)}.statcard.yellow{--sc:var(--bee);--sc-fg:#e0a500}.statcard.blue{--sc:var(--macaw);--sc-fg:var(--macaw-dark)}.statcard.orange{--sc:var(--fox);--sc-fg:var(--fox-dark)}.statcard.purple{--sc:var(--beetle);--sc-fg:var(--beetle-dark)}.statcard.red{--sc:var(--cardinal);--sc-fg:var(--cardinal-dark)}.stat-row{grid-template-columns:repeat(auto-fit,minmax(100px,1fr));align-items:stretch;gap:12px;display:grid}.stat-row .statcard{min-width:0}.pbar-wrap{flex:1;min-width:0;position:relative}.pbar-caption{text-align:center;letter-spacing:var(--ls-label);text-transform:uppercase;color:var(--pbar-color,var(--feather));animation:rise-in var(--dur-slow) var(--spring) both;font-size:12px;font-weight:800;line-height:1;position:absolute;bottom:calc(100% + 4px);left:0;right:0}.pbar{border-radius:var(--radius-pill);background:var(--swan);width:100%;height:16px;position:relative;overflow:hidden}.pbar.sm{height:10px}.pbar.lg{height:20px}.pbar-fill{border-radius:var(--radius-pill);background:var(--pbar-color,var(--feather));min-width:16px;transition:width .4s var(--ease),background var(--dur-slow);position:absolute;inset:0 auto 0 0}.pbar-fill:after{content:"";background:#ffffff4d;border-radius:2px;height:4px;position:absolute;top:4px;left:8px;right:8px}.pbar.sm .pbar-fill{min-width:10px}.pbar.lg .pbar-fill{min-width:20px}.pbar.sm .pbar-fill:after{height:2px;top:3px;left:6px;right:6px}.pbar.lg .pbar-fill:after{height:5px;top:5px}.pbar-fill.tiny:after{display:none}.pbar-fill .sweep{opacity:0;background:linear-gradient(100deg,#0000 20%,#ffffff8c 50%,#0000 80%);position:absolute;inset:0;transform:translate(-100%)}.pbar-fill.bump .sweep{animation:pbar-sweep .7s var(--ease) both}@keyframes pbar-sweep{0%{opacity:1;transform:translate(-100%)}to{opacity:0;transform:translate(100%)}}.pseg{gap:4px;display:flex}.pseg span{border-radius:var(--radius-pill);background:var(--swan);height:12px;transition:background var(--dur) var(--ease);flex:1}.pseg span.on{background:var(--pbar-color,var(--feather))}.pseg span.now{background:var(--pbar-color,var(--feather));animation:1.2s infinite pulse}@keyframes pulse{0%,to{opacity:1}50%{opacity:.45}}.sheet{z-index:30;padding:14px 16px calc(14px + var(--safe-bottom));background:var(--snow);border-top:var(--border) solid var(--swan);transition:transform var(--dur-slow) var(--ease);position:fixed;bottom:0;left:0;right:0;transform:translateY(0)}.sheet.correct,.sheet.wrong{transition:transform var(--dur-slow) var(--ease),background .16s var(--ease),border-color .16s var(--ease)}.sheet.inline{z-index:auto;border-radius:var(--radius-lg);border:var(--border) solid var(--swan);padding-bottom:16px;position:relative}.sheet.hidden-sheet{transform:translateY(110%)}.sheet.correct{background:var(--feather-light);border-color:var(--feather-light)}.sheet.wrong{background:var(--cardinal-light);border-color:var(--cardinal-light)}.sheet-inner{max-width:var(--content-w);flex-direction:column;gap:12px;margin:0 auto;display:flex}.sheet.correct .sheet-inner,.sheet.wrong .sheet-inner{animation:sheet-up var(--dur) var(--ease) both}@keyframes sheet-up{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}.sheet-head{flex-direction:column;gap:6px;min-width:0;display:flex}.sheet-row{align-items:center;gap:12px;min-width:0;display:flex}.sheet-icon{--sheet-ico:40px;width:var(--sheet-ico);height:var(--sheet-ico);color:var(--feather-dark);animation:pop-in var(--dur-slow) var(--spring) both;background:#fff;border-radius:50%;flex:none;place-items:center;display:grid;position:relative}.sheet-icon svg{width:22px;height:22px}.sheet.correct .sheet-icon:after{content:"";opacity:0;animation:sheet-ring .7s var(--ease) .14s both;border:3px solid #fff;border-radius:50%;position:absolute;inset:-3px}@keyframes sheet-ring{0%{opacity:.9;transform:scale(.8)}to{opacity:0;transform:scale(1.7)}}.sheet.wrong .sheet-icon{color:var(--cardinal-dark)}.sheet-title{min-width:0;font-size:var(--fs-title);color:var(--text);overflow-wrap:anywhere;flex:1;font-weight:800;line-height:1.2}.sheet.correct .sheet-title{color:var(--feather-dark)}.sheet.wrong .sheet-title{color:var(--cardinal-dark)}.sheet-body{color:var(--text-body);font-size:16px;font-weight:600;line-height:1.3}.sheet.correct .sheet-body{color:var(--feather-dark)}.sheet.wrong .sheet-body{color:var(--cardinal-dark)}.sheet-meta{border-radius:var(--radius-pill);height:28px;letter-spacing:var(--ls-label);text-transform:uppercase;white-space:nowrap;color:var(--wolf);animation:pop-in var(--dur-slow) var(--spring) both;background:#ffffffbf;flex:none;align-items:center;gap:6px;padding:0 10px;font-size:12px;font-weight:800;animation-delay:.12s;display:inline-flex}.sheet.correct .sheet-meta{color:var(--feather-dark)}.sheet.wrong .sheet-meta{color:var(--cardinal-dark)}.sheet-space{width:100%;transition:height var(--dur) var(--ease);flex:none}.sheet-actions{gap:10px;display:flex}.sheet-actions .btn{flex:1}@media (width>=900px){.sheet{padding:24px 40px calc(24px + var(--safe-bottom))}.sheet.inline{padding:24px}.sheet-inner{max-width:var(--footer-w);flex-direction:row;justify-content:space-between;align-items:center;gap:24px}.sheet-icon{--sheet-ico:56px}.sheet-icon svg{width:30px;height:30px}.sheet-row{gap:16px}.sheet-body{font-size:var(--fs-body);line-height:1.35}.sheet-body.indent{padding-left:72px}.sheet-actions{flex:none}.sheet-actions .btn{flex:none;min-width:150px}.sheet-head,.sheet-spacer{flex:1}}.topbar{padding:calc(12px + var(--safe-top)) 0 12px;max-width:var(--footer-w);align-items:center;gap:16px;width:100%;margin:0 auto;display:flex}.topbar .x{width:40px;height:40px;color:var(--hare);cursor:pointer;transition:background var(--dur-fast),color var(--dur-fast),transform var(--dur-fast) var(--ease);background:0 0;border:0;border-radius:50%;place-items:center;margin:0 -8px;display:grid}.topbar .x svg{width:24px;height:24px}.topbar .x:hover{background:var(--polar);color:var(--wolf)}.topbar .x:active{transform:scale(.9)}.topbar .grow{flex:1;min-width:0}.topbar .title{color:var(--text);font-size:20px;font-weight:800}.stat{align-items:center;gap:6px;font-size:17px;font-weight:800;line-height:1;display:inline-flex}.stat .ico{font-size:24px;line-height:1}.stat.streak{color:var(--fox)}.stat.xp{color:var(--bee-dark)}.stat.gem{color:var(--macaw)}.stat.off{color:var(--hare);filter:grayscale()}.toast-host{bottom:calc(76px + var(--safe-bottom));z-index:40;pointer-events:none;flex-direction:column;align-items:center;gap:8px;padding:0 16px;display:flex;position:fixed;left:0;right:0}@media (width>=900px){.toast-host{bottom:32px}}.toast{--t-bg:var(--eel);--t-edge:#2a2a2a;pointer-events:auto;background:var(--t-bg);color:#fff;font-weight:800;font-size:var(--fs-label);letter-spacing:.2px;border-radius:var(--radius-lg);box-shadow:0 var(--edge) 0 var(--t-edge);max-width:420px;animation:toast-in var(--dur-slow) var(--spring);align-items:center;gap:10px;padding:12px 18px;display:flex}.toast .ico{font-size:20px;line-height:1}.toast.success{--t-bg:var(--feather);--t-edge:var(--feather-dark)}.toast.info{--t-bg:var(--macaw);--t-edge:var(--macaw-dark)}.toast.warn{--t-bg:var(--fox);--t-edge:var(--fox-dark)}@keyframes toast-in{0%{opacity:0;transform:translateY(20px)scale(.9)}to{opacity:1;transform:none}}.modal-back{z-index:50;animation:fade-in var(--dur) both;background:#00000080;place-items:center;padding:20px;display:grid;position:fixed;inset:0}.modal{background:var(--snow);border-radius:var(--radius-lg);width:100%;max-width:420px;animation:pop-in var(--dur-slow) var(--spring) both;overscroll-behavior:contain;flex-direction:column;gap:12px;max-height:calc(100dvh - 40px);padding:32px 24px 24px;display:flex;overflow-y:auto}.modal>*{flex-shrink:0}.modal .modal-art{text-align:center;margin-bottom:4px;font-size:56px;line-height:1}.modal h2{text-align:center;font-size:var(--fs-title);line-height:1.2}.modal p{text-align:center;color:var(--text-muted);font-weight:600;font-size:var(--fs-body);line-height:1.35}.modal p+.btn,.modal h2+.btn{margin-top:12px}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes pop-in{0%{opacity:0;transform:scale(.85)}to{opacity:1;transform:none}}.ibadge-wrap{flex:none;place-items:center;display:inline-grid;position:relative}.ibadge-wrap .ring{position:absolute;inset:0;transform:rotate(-90deg)}.ibadge-wrap .ring circle{fill:none;stroke-width:6px;stroke-linecap:round}.ibadge-wrap .ibadge{margin-bottom:var(--edge)}.ibadge-wrap .ibadge.big{margin-bottom:8px}.ibadge-wrap .ring .track{stroke:var(--swan)}.ibadge-wrap .ring .val{stroke:var(--ibadge-ring,var(--feather));transition:stroke-dashoffset .5s var(--ease)}.ibadge{--ibadge-edge:var(--feather-dark);background:var(--feather);color:#fff;box-shadow:0 var(--edge) 0 var(--ibadge-edge);-webkit-user-select:none;user-select:none;transition:transform var(--dur-fast) var(--ease),box-shadow var(--dur-fast) var(--ease);border-radius:50%;flex:none;place-items:center;font-weight:900;line-height:1;display:inline-grid}.ibadge.big{box-shadow:0 8px 0 var(--ibadge-edge)}.ibadge.pressable{cursor:pointer}.ibadge.pressable:active{transform:translateY(var(--edge));box-shadow:0 0 0 var(--ibadge-edge)}.ibadge.big.pressable:active{transform:translateY(8px)}.ibadge.green{background:var(--feather);--ibadge-edge:var(--feather-dark)}.ibadge.blue{background:var(--macaw);--ibadge-edge:var(--macaw-dark)}.ibadge.yellow{background:var(--bee);--ibadge-edge:var(--bee-dark)}.ibadge.red{background:var(--cardinal);--ibadge-edge:var(--cardinal-dark)}.ibadge.orange{background:var(--fox);--ibadge-edge:var(--fox-dark)}.ibadge.purple{background:var(--beetle);--ibadge-edge:var(--beetle-dark)}.ibadge.gray,.ibadge.locked{background:var(--swan);--ibadge-edge:var(--swan-dark);color:var(--hare)}.ibadge.locked{filter:grayscale()}.bob-tip{background:var(--snow);border:var(--border) solid var(--swan);border-radius:var(--radius);font-size:var(--fs-label);letter-spacing:var(--ls-label);text-transform:uppercase;color:var(--feather);padding:8px 14px;font-weight:800;animation:1.1s ease-in-out infinite bob;display:inline-block;position:relative}.bob-tip:after{content:"";background:var(--snow);border-right:var(--border) solid var(--swan);border-bottom:var(--border) solid var(--swan);width:12px;height:12px;margin-left:-7px;position:absolute;bottom:-8px;left:50%;transform:rotate(45deg)}@keyframes bob{0%,to{transform:translate(-50%)}50%{transform:translate(-50%,-6px)}}.bubble{background:var(--snow);border:var(--border) solid var(--swan);border-radius:var(--radius-lg);font-weight:600;font-size:var(--fs-body);color:var(--text);animation:bubble-in var(--dur-slow) var(--spring) both;padding:14px 18px;line-height:1.35;position:relative}@keyframes bubble-in{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:none}}.bubble.left:before{content:"";background:var(--snow);border-left:var(--border) solid var(--swan);border-bottom:var(--border) solid var(--swan);width:14px;height:14px;position:absolute;top:20px;left:-9px;transform:rotate(45deg)}.bubble.bottom:before{content:"";background:var(--snow);border-right:var(--border) solid var(--swan);border-bottom:var(--border) solid var(--swan);width:14px;height:14px;position:absolute;bottom:-9px;left:28px;transform:rotate(45deg)}.bubble.top:before{content:"";background:var(--snow);border-left:var(--border) solid var(--swan);border-top:var(--border) solid var(--swan);width:14px;height:14px;margin-left:-7px;position:absolute;top:-9px;left:50%;transform:rotate(45deg)}.choice{text-align:left;border-radius:var(--radius-lg);border:var(--border) solid var(--swan);background:var(--snow);width:100%;min-height:64px;color:var(--text);font-weight:700;font-size:var(--fs-body);cursor:pointer;box-shadow:0 2px 0 var(--swan);-webkit-user-select:none;user-select:none;touch-action:manipulation;transition:transform var(--dur-fast) var(--ease),background var(--dur-fast),border-color var(--dur-fast),box-shadow var(--dur-fast) var(--ease),color var(--dur-fast);align-items:center;gap:14px;padding:14px 16px;line-height:1.3;display:flex}@media (hover:hover){.choice:hover:not(:disabled){background:var(--polar)}}.choice:active:not(:disabled){box-shadow:none;transform:translateY(2px)}.choice .key{border:var(--border) solid var(--swan);width:30px;height:30px;color:var(--wolf);border-radius:8px;flex:none;place-items:center;font-size:14px;font-weight:900;line-height:1;display:grid}.choice .ico{flex:none;font-size:28px;line-height:1}.choice.selected{border-color:var(--macaw-edge);background:var(--macaw-light);box-shadow:0 2px 0 var(--macaw-edge);color:var(--macaw-dark)}.choice.selected .key{border-color:var(--macaw-edge);color:var(--macaw)}.choice.correct{border-color:var(--feather-edge);background:var(--feather-light);color:var(--feather-dark);box-shadow:0 2px 0 var(--feather-edge)}.choice.correct .key{border-color:var(--feather-edge);color:var(--feather-dark)}.choice.wrong{border-color:var(--cardinal-edge);background:var(--cardinal-light);color:var(--cardinal-dark);box-shadow:0 2px 0 var(--cardinal-edge)}.choice.wrong .key{border-color:var(--cardinal-edge);color:var(--cardinal-dark)}.choice.selected:hover,.choice.correct:hover,.choice.wrong:hover{background:inherit}.choice:disabled{cursor:default}.choice:disabled:not(.selected):not(.correct):not(.wrong){color:var(--hare)}.choice:focus-visible{outline:3px solid var(--macaw);outline-offset:2px}.tile{border-radius:var(--radius);border:var(--border) solid var(--swan);background:var(--snow);min-height:44px;color:var(--text);font-weight:700;font-size:var(--fs-body);cursor:pointer;box-shadow:0 2px 0 var(--swan);-webkit-user-select:none;user-select:none;transition:transform var(--dur-fast) var(--ease),background var(--dur-fast),box-shadow var(--dur-fast);align-items:center;padding:10px 14px;display:inline-flex}@media 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.btn{flex:1}@media (width>=900px){.cta-end{justify-content:flex-end}.cta-end .btn{flex:none;min-width:150px}}::selection{background:var(--macaw-light)}.shell{flex-direction:column;min-height:100%;display:flex}.shell-main{width:100%;max-width:var(--content-w);padding:0 16px calc(84px + var(--safe-bottom));flex:1;margin:0 auto}.shell-main.wide{max-width:960px}.bottom-nav{background:var(--snow);border-top:2px solid var(--swan);padding:6px 8px calc(6px + var(--safe-bottom));z-index:20;justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0}.bottom-nav a{border-radius:var(--radius);color:var(--hare);text-transform:uppercase;letter-spacing:.04em;transition:background var(--dur-fast);flex-direction:column;align-items:center;gap:2px;padding:8px 14px;font-size:11px;font-weight:800;display:flex}.bottom-nav a .ico{font-size:24px;line-height:1}.bottom-nav a.active{color:var(--macaw);background:var(--macaw-light);border:2px solid #84d8ff}.side-nav{display:none}@media (width>=900px){.shell{flex-direction:row}.side-nav{border-right:2px solid var(--swan);flex-direction:column;gap:6px;width:240px;height:100vh;padding:24px 16px;display:flex;position:sticky;top:0}.side-nav .brand{color:var(--feather);padding:8px 12px 20px;font-size:26px;font-weight:900}.side-nav a{border-radius:var(--radius);text-transform:uppercase;letter-spacing:.05em;color:var(--wolf);border:2px solid #0000;align-items:center;gap:14px;padding:12px 14px;font-size:14px;font-weight:800;display:flex}.side-nav a .ico{font-size:24px}.side-nav a.active{color:var(--macaw);background:var(--macaw-light);border-color:#84d8ff}.bottom-nav{display:none}.shell-main{padding-bottom:40px}}