.head{margin-bottom:20px}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:18px;align-items:start}
.player{padding:0;overflow:hidden}
.screen{position:relative;aspect-ratio:16/9;background:#05081a}
.screen video{width:100%;height:100%;display:block;object-fit:contain;background:#05081a}
.cap{position:absolute;left:50%;bottom:6%;transform:translateX(-50%);max-width:86%;text-align:center;pointer-events:none}
.cap span{display:inline;background:rgba(5,8,26,.78);color:#fff;font-weight:600;font-size:clamp(13px,2.1vw,22px);line-height:1.5;padding:4px 10px;border-radius:8px;-webkit-box-decoration-break:clone;box-decoration-break:clone}
.bigplay{position:absolute;inset:0;margin:auto;width:92px;height:92px;border-radius:50%;border:0;cursor:pointer;color:#fff;background:var(--grad);box-shadow:0 0 0 10px rgba(255,255,255,.1),0 20px 50px -10px rgba(236,72,153,.8);display:grid;place-items:center;transition:transform .2s}
.bigplay:hover{transform:scale(1.06)}.bigplay svg{width:40px;height:40px;margin-left:4px}
.bigplay[hidden]{display:none}
.qlayer{position:absolute;inset:0;display:grid;place-items:center;padding:4%;background:rgba(5,8,26,.62);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);animation:fade .25s}
.qlayer[hidden]{display:none}
@keyframes fade{from{opacity:0}}
.qbox{width:min(620px,100%);max-height:100%;overflow:auto;padding:22px 24px;border-radius:18px;background:linear-gradient(160deg,rgba(34,211,238,.16),rgba(124,58,237,.2) 60%,rgba(236,72,153,.16)),rgba(15,20,52,.95);border:1px solid rgba(255,255,255,.22);box-shadow:0 30px 60px -20px rgba(0,0,0,.8)}
.qbox h2{font-size:clamp(17px,2.2vw,22px);line-height:1.3;margin:4px 0 14px}
.qopts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.qopt{text-align:left;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.06);cursor:pointer;font-weight:600;font-size:14.5px;min-height:46px}
.qopt:hover:not([disabled]){border-color:var(--cy)}
.qopt.right{border-color:#34d399;background:rgba(52,211,153,.2)}.qopt.wrong{border-color:#fb7185;background:rgba(251,113,133,.16)}
.qopt.picked{border-color:var(--vi2);background:rgba(124,58,237,.3)}
.qopt .n{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:7px;background:rgba(255,255,255,.12);font-size:12px;margin-right:6px}
.qfb{margin-top:12px;font-size:14px;color:#dbe4f7;min-height:1.2em}
.qact{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.qact .btn{padding:10px 16px;font-size:14px;min-height:42px}
.seq{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 12px;min-height:36px}
.seq span{padding:6px 10px;border-radius:999px;background:rgba(124,58,237,.35);font-size:13px;font-weight:700}
.ctrl{display:flex;align-items:center;gap:10px;padding:10px 14px;border-top:1px solid var(--line);flex-wrap:nowrap}
.ib{width:42px;height:42px;flex:none;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.06);cursor:pointer;display:grid;place-items:center}
.ib svg{width:22px;height:22px}
.time{font-variant-numeric:tabular-nums;font-size:13px;color:var(--mut);white-space:nowrap;flex:none}
.prog{position:relative;flex:1;min-width:60px;height:42px;display:flex;align-items:center}
.prog .track{position:absolute;left:0;right:0;height:6px;border-radius:6px;background:rgba(255,255,255,.14);pointer-events:none;overflow:hidden}
.prog .track i{display:block;height:100%;width:0;background:var(--grad)}
.prog input{position:relative;z-index:2;width:100%;margin:0;opacity:0;height:42px;cursor:pointer}
.prog input:focus-visible+.track{outline:3px solid var(--cy);outline-offset:6px}
#marks{position:absolute;inset:0;pointer-events:none}
#marks b{position:absolute;top:50%;width:14px;height:14px;margin:-7px 0 0 -7px;border-radius:50%;background:#fbbf24;border:2px solid #0b1026;z-index:3}
#marks b.done{background:#34d399}
.cc{display:flex;border:1px solid var(--line);border-radius:12px;overflow:hidden;flex:none}
.cc button{background:none;border:0;padding:0 10px;height:40px;font-weight:800;font-size:12.5px;cursor:pointer;color:var(--mut)}
.cc button[aria-pressed="true"]{background:var(--grad);color:#fff}
.player:fullscreen{border-radius:0;display:flex;flex-direction:column;background:#05081a}
.player:fullscreen .screen{flex:1;aspect-ratio:auto}
.panel{display:grid;gap:14px}
.box{padding:16px}
.qs{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:10px}
.chapters,.transcript{list-style:none;display:grid;gap:4px}
.chapters button{width:100%;display:flex;gap:10px;align-items:center;text-align:left;padding:8px 10px;border-radius:10px;border:0;background:none;cursor:pointer;font-size:14px;font-weight:600}
.chapters button:hover{background:rgba(255,255,255,.06)}
.chapters button.on{background:rgba(34,211,238,.12);color:#a5f3fc}
.chapters button[aria-disabled="true"]{opacity:.5;cursor:not-allowed}
.chapters .tc{margin-left:auto;font-size:12px;color:var(--mut);font-variant-numeric:tabular-nums}
.chapters .q{font-size:11px;font-weight:800;padding:2px 7px;border-radius:999px;background:rgba(251,191,36,.18);color:#fde68a}
.chapters .q.ok{background:rgba(52,211,153,.18);color:#6ee7b7}
.transcript{max-height:260px;overflow:auto;padding-right:4px}
.transcript li{font-size:13.5px;padding:6px 8px;border-radius:8px;color:var(--mut);line-height:1.45}
.transcript li.on{color:#fff;background:rgba(124,58,237,.25)}
.keys{margin-top:14px}
kbd{font:inherit;font-size:11.5px;padding:1px 6px;border-radius:5px;border:1px solid var(--line);background:rgba(255,255,255,.06)}
.done-card{text-align:center}.done-card .big{font-size:48px;font-weight:800;margin:6px 0}
@media(max-width:980px){.layout{grid-template-columns:1fr}.transcript{max-height:200px}}
@media(max-width:560px){.qopts{grid-template-columns:1fr}.ctrl{gap:6px;padding:8px}.time{display:none}.ib{width:38px;height:38px}.cc button{padding:0 7px}
 .screen.asking{aspect-ratio:auto;min-height:56.25vw}.screen.asking video{position:absolute;inset:0}.screen.asking .qlayer{position:relative;inset:auto;min-height:56.25vw}
 .qbox{padding:16px}.keys{display:none}}
/* v2 */
.feat{list-style:none;display:flex;flex-wrap:wrap;gap:8px;padding:0;margin:14px 0 6px}
.feat li{padding:6px 12px;border-radius:999px;background:#ffffff0d;border:1px solid #ffffff1f;font-size:.85rem;font-weight:600}
.screen{overflow:hidden;border-radius:18px 18px 0 0}
.screen video{width:100%;height:100%;object-fit:cover;display:block}
.screen:after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse at center,transparent 60%,#05081a66 100%)}
.ib.tx{width:auto;padding:0 10px;font:inherit;font-size:12.5px;font-weight:800;color:var(--mut)}
.ib.tx[aria-pressed=true]{color:#fff;border-color:#22d3ee88;background:#22d3ee1f}
#qual{color:#fff}
.ann{position:absolute;inset:0;pointer-events:none;z-index:2}
.an{position:absolute;transform:translate(-50%,-50%) scale(.9);display:flex;align-items:center;gap:8px;padding:7px 13px 7px 9px;border-radius:999px;background:#0b1026b8;border:1px solid #ffffff40;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);color:#fff;font-weight:700;font-size:clamp(11px,1.3vw,15px);white-space:nowrap;opacity:0;transition:opacity .6s,transform .6s cubic-bezier(.2,.9,.3,1.3);box-shadow:0 10px 30px -10px #000}
.an.on{opacity:1;transform:translate(-50%,-50%) scale(1)}
.an i{width:22px;height:22px;border-radius:50%;flex:none;background:var(--grad);position:relative}
.an i:after{content:"";position:absolute;inset:-6px;border-radius:50%;border:2px solid #22d3ee;opacity:0;animation:annp 2s infinite}
@keyframes annp{0%{opacity:.8;transform:scale(.6)}100%{opacity:0;transform:scale(1.6)}}
.an.k-up i:before,.an.k-flow i:before,.an.k-rain i:before{content:"";position:absolute;left:50%;top:50%;width:8px;height:8px;border:solid #fff;border-width:2px 2px 0 0;transform:translate(-50%,-30%) rotate(-45deg)}
.an.k-rain i:before,.an.k-flow i:before{transform:translate(-50%,-70%) rotate(135deg)}
.an.k-up span:after{content:"";display:inline-block;width:2px;height:0}
.an.k-sun i{background:radial-gradient(circle,#fff7c2,#fbbf24 60%,#f59e0b)}
.an.k-cloud i{background:radial-gradient(circle at 40% 40%,#fff,#bae6fd)}
.screen.asking .ann{opacity:0}
@media(max-width:560px){.an{padding:5px 9px 5px 6px;gap:6px}.an i{width:16px;height:16px}.feat li{font-size:.78rem}}
@media(prefers-reduced-motion:reduce){.an i:after{animation:none}}
@media(max-width:700px){.ctrl{flex-wrap:wrap}.prog{order:-1;flex-basis:100%;height:30px}.prog input{height:30px}.time{display:inline!important;margin-right:auto;font-size:12px}
 .cap{bottom:4%;max-width:94%}.cap span{font-size:12px;padding:2px 7px}.an{font-size:10.5px}}
@media(max-width:440px){.time{display:none!important}.ib.tx{padding:0 7px}}