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ol{counter-reset:s;gap:var(--s4);grid-template-columns:repeat(3,minmax(0,1fr));margin:0;padding:0;list-style:none;display:grid}.how li{counter-increment:s;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:var(--s5);position:relative}.how li:before{content:counter(s);font-family:var(--display);color:#fff;background:var(--c);border-radius:12px;place-items:center;width:38px;height:38px;margin-bottom:14px;font-size:1.1rem;font-weight:800;display:grid}.how li:first-child{--c:var(--k0)}.how li:nth-child(2){--c:var(--k1)}.how li:nth-child(3){--c:var(--k3)}.how li h3{margin-bottom:6px}.how li p{color:var(--text-muted);margin:0}.feats{max-width:1180px;margin:0 auto var(--s7);padding:0 var(--s5)}.feat{transition:transform .15s,box-shadow .15s}.feat:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}.feat .shape{width:26px;height:26px;margin-bottom:12px}@media (width<=800px){.how ol{grid-template-columns:1fr}.demo{transform:none}}.bar{background:var(--surface-2);border-radius:99px;min-width:80px;height:12px;overflow:hidden}.bar>i{background:var(--grad);border-radius:99px;height:100%;transition:width .6s cubic-bezier(.2,.8,.2,1);display:block}.hist{grid-template-columns:repeat(10,1fr);align-items:end;gap:6px;height:170px;padding-top:8px;display:grid}.hist .col{height:100%;color:var(--text-muted);align-content:end;justify-items:center;gap:4px;font-size:.78rem;font-weight:700;display:grid}.hist .col i{background:var(--grad);border-radius:8px 8px 0 0;width:100%;min-height:3px;transition:height .5s cubic-bezier(.2,.8,.2,1);display:block}.join-box{text-align:center}.join-code{font-family:var(--display);letter-spacing:.14em;background:var(--grad);color:#0000;-webkit-background-clip:text;background-clip:text;font-size:clamp(2.4rem,9vw,4rem);font-weight:800}.qr{border:2px solid var(--border);width:220px;box-shadow:var(--shadow-md);background:#fff;border-radius:18px;padding:10px;line-height:0}.qr svg{width:100%;height:auto;display:block}.copybox{align-items:stretch;gap:8px;display:flex}.copybox input{font-family:var(--mono);font-size:.9rem}.option-row{gap:var(--s2);margin-bottom:var(--s2);grid-template-columns:28px minmax(0,1fr) auto;align-items:center;display:grid}.picker{border:2px solid var(--border);border-radius:var(--radius-sm);max-height:440px;overflow:auto}.picker-item{gap:var(--s3);padding:var(--s3) var(--s4);border-bottom:1px solid var(--border);align-items:flex-start;transition:background .1s;display:flex}.picker-item:last-child{border-bottom:0}.picker-item:hover{background:var(--primary-soft)}.steps{gap:var(--s2);margin-bottom:var(--s5);flex-wrap:wrap;padding:0;list-style:none;display:flex}.steps li{align-items:center;gap:var(--s2);border:2px solid var(--border);background:var(--surface);color:var(--text-muted);border-radius:999px;padding:6px 16px 6px 6px;font-size:.9rem;font-weight:700;transition:all .2s;display:flex}.steps li .n{background:var(--surface-2);border-radius:50%;place-items:center;width:28px;height:28px;font-size:.82rem;display:grid}.steps li[aria-current=step]{color:var(--primary);border-color:var(--primary);box-shadow:0 4px 14px #5b3df533}.steps li[aria-current=step] .n{background:var(--grad);color:#fff}.steps li.done .n{background:var(--k3);color:#fff}.player{grid-template-rows:auto 1fr auto;min-height:100vh;display:grid}.player-top{background:var(--surface);border-bottom:1px solid var(--border);padding:var(--s3) var(--s4);justify-content:space-between;align-items:center;gap:var(--s3);z-index:30;flex-wrap:wrap;display:flex;position:sticky;top:0}.timer{font-variant-numeric:tabular-nums;font-family:var(--display);background:var(--primary-soft);color:var(--primary);border-radius:999px;align-items:center;gap:8px;padding:6px 16px;font-size:1.3rem;font-weight:800;transition:background .3s,color .3s;display:inline-flex}.timer.low{background:var(--danger-soft);color:var(--danger);animation:1s ease-in-out infinite throb}@keyframes throb{50%{transform:scale(1.06)}}.player-body{gap:var(--s5);padding:var(--s5);grid-template-columns:minmax(0,1fr) 290px;align-items:start;width:100%;max-width:1200px;margin:0 auto;display:grid}@media (width<=900px){.player-body{padding:var(--s4);grid-template-columns:1fr}}.progress{background:var(--surface-2);border-radius:99px;height:10px;overflow:hidden}.progress>i{background:var(--grad);border-radius:99px;height:100%;transition:width .4s cubic-bezier(.2,.8,.2,1);display:block}.qnum{color:var(--primary);margin:0;font-size:.95rem;font-weight:800}.qtext{font-family:var(--display);white-space:pre-wrap;overflow-wrap:anywhere;margin-bottom:var(--s5);font-size:clamp(1.25rem,1.05rem + 1vw,1.7rem);font-weight:700;line-height:1.25}.choices{gap:var(--s3);border:0;min-width:0;margin:0;padding:0;display:grid}.choice{gap:var(--s3);padding:var(--s3) var(--s4);border:2px solid var(--border);background:var(--surface);cursor:pointer;border-radius:18px;align-items:center;min-height:62px;transition:transform .12s,border-color .12s,background .12s,box-shadow .12s;display:flex}.choice:hover{border-color:var(--ck,var(--border-strong));transform:translate(4px)}.choice:active{transform:scale(.985)}.choice:has(input:checked){border-color:var(--ck);background:color-mix(in srgb, var(--ck) 12%, var(--surface));box-shadow:0 6px 18px color-mix(in srgb, var(--ck) 25%, transparent);animation:.3s bump}.choice:has(input:focus-visible){box-shadow:var(--focus)}.choice input{opacity:0;width:1px;height:1px;position:absolute}.choice .t{overflow-wrap:anywhere;white-space:pre-wrap;flex:1;font-weight:600}.choice:after{content:"✓";background:var(--ck);color:#fff;opacity:0;border-radius:50%;flex:none;place-items:center;width:26px;height:26px;font-weight:800;transition:all .18s;display:grid;transform:scale(.4)}.choice:has(input:checked):after{opacity:1;transform:none}.key{isolation:isolate;color:#fff;flex:none;place-items:center;width:38px;height:38px;font-weight:800;display:grid;position:relative}.key:before{content:"";z-index:-1;background:var(--ck);position:absolute;inset:0}.choice.k0,.key.k0{--ck:var(--k0)}.choice.k1,.key.k1{--ck:var(--k1)}.choice.k2,.key.k2{--ck:var(--k2)}.choice.k3,.key.k3{--ck:var(--k3)}.key.k0:before{border-radius:50%}.key.k1:before{border-radius:8px}.key.k2:before{clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%)}.key.k3:before{clip-path:polygon(25% 3%,75% 3%,100% 50%,75% 97%,25% 97%,0 50%)}.navgrid{grid-template-columns:repeat(auto-fill,minmax(46px,1fr));gap:8px;display:grid}.navbtn{border:2px solid var(--border);background:var(--surface);min-height:46px;font:inherit;cursor:pointer;color:var(--text);border-radius:12px;font-weight:800;transition:transform .1s,background .1s,border-color .1s;position:relative}.navbtn:hover{border-color:var(--primary);transform:translateY(-2px)}.navbtn.answered{background:var(--primary);border-color:var(--primary);color:#fff}.navbtn[aria-current=true]{box-shadow:0 0 0 3px var(--surface), 0 0 0 5px var(--primary)}.navbtn .mk{background:var(--k2);color:#fff;border-radius:99px;padding:0 6px;font-size:.75rem;font-weight:800;line-height:1.6;position:absolute;top:-8px;right:-6px}.legend{color:var(--text-muted);margin-top:var(--s4);gap:6px;font-size:.84rem;display:grid}.savebar{background:var(--teal-soft);color:var(--success);border-radius:999px;align-items:center;gap:6px;padding:6px 14px;font-size:.85rem;font-weight:700;display:inline-flex}.savebar.bad{background:var(--danger-soft);color:var(--danger)}.savebar.busy{background:var(--surface-2);color:var(--text-muted)}.player-bottom{padding:var(--s3) var(--s4);background:var(--surface);border-top:1px solid var(--border);z-index:20;position:sticky;bottom:0}.player-bottom .inner{gap:var(--s3);flex-wrap:wrap;justify-content:space-between;max-width:1200px;margin:0 auto;display:flex}.result-hero{text-align:center;position:relative;overflow:hidden}.result-hero:before{content:"";background:var(--grad);height:8px;position:absolute;inset:0 0 auto}.score-ring{background:conic-gradient(var(--primary) calc(var(--p) * 1%), var(--surface-2) 0);border-radius:50%;place-items:center;width:160px;height:160px;transition:background .1s;display:grid}.score-ring>div{background:var(--surface);text-align:center;width:126px;height:126px;font-family:var(--display);border-radius:50%;place-items:center;font-size:2rem;font-weight:800;display:grid}.review-q{padding:var(--s4) 0;border-bottom:1px solid var(--border)}.review-q:last-child{border-bottom:0}.review-opt{border:2px solid var(--border);border-radius:12px;align-items:flex-start;gap:8px;margin-top:6px;padding:9px 14px;display:flex}.review-opt.correct{border-color:var(--success);background:var(--success-soft)}.review-opt.wrong{border-color:var(--danger);background:var(--danger-soft)}.confetti{pointer-events:none;z-index:70;position:fixed;inset:0;overflow:hidden}.confetti i{background:var(--c);width:10px;height:14px;animation:fall var(--d) cubic-bezier(.3, .6, .5, 1) forwards;animation-delay:var(--w);opacity:0;border-radius:2px;position:absolute;top:-20px}@keyframes fall{0%{opacity:1;transform:translateY(0)rotate(0)}to{opacity:0;transform:translate(var(--x), 105vh) rotate(var(--r))}}