html,body{height:100%;overflow:hidden;background:#000}
#stage{position:absolute;left:50%;top:50%;width:1920px;height:1080px;transform-origin:center;overflow:hidden;background:var(--deep)}
.p-slide{position:absolute;inset:0;display:none;flex-direction:column;padding:70px 120px 110px;color:#fff;
 background:radial-gradient(1200px 700px at 85% 10%,rgba(29,95,209,.45),transparent 60%),
 repeating-linear-gradient(0deg,rgba(255,255,255,.035) 0 1px,transparent 1px 60px),
 repeating-linear-gradient(90deg,rgba(255,255,255,.035) 0 1px,transparent 1px 60px),linear-gradient(160deg,var(--navy) 0%,var(--deep) 100%)}
.p-slide.active{display:flex;animation:pin .4s ease}
@keyframes pin{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.p-slide.active{animation:none}}
.p-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:26px}
.p-mission{display:inline-flex;align-items:center;gap:16px;background:var(--gold);color:var(--deep);font-weight:900;font-size:30px;letter-spacing:.06em;padding:8px 26px;border-radius:8px;clip-path:polygon(0 0,100% 0,96% 100%,0 100%)}
.p-order{font-size:24px;color:var(--gold2);border:2px solid rgba(244,210,122,.5);padding:6px 16px;border-radius:6px}
.p-title{font-size:96px;font-weight:900;line-height:1.05;letter-spacing:-.01em}
.p-title .zh{display:block;font-size:44px;color:var(--gold2);font-weight:700;margin-top:10px}
.p-sub{font-size:34px;color:#c9d6f0;margin-top:18px}
.p-foot{position:absolute;left:0;right:0;bottom:0;height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 40px;background:rgba(3,12,30,.75);border-top:3px solid var(--gold);font-size:22px;color:#c9d6f0;z-index:5}
.p-foot button{font-family:var(--font);font-size:22px;font-weight:700;background:transparent;color:#fff;border:2px solid rgba(255,255,255,.35);border-radius:10px;padding:6px 18px;margin-left:10px;cursor:pointer;min-height:44px}
.p-foot .dots{display:flex;gap:10px}
.p-foot .dots i{width:14px;height:14px;border-radius:50%;background:rgba(255,255,255,.25);display:block}
.p-foot .dots i.on{background:var(--gold)}
/* cover */
.cover{display:grid;grid-template-columns:minmax(0,1fr) 680px;gap:60px;flex:1;min-height:0}
.cover .img{position:relative;border-radius:24px;overflow:hidden;border:4px solid var(--gold);box-shadow:0 20px 60px rgba(0,0,0,.5)}
.cover .img > img{width:100%;height:100%;object-fit:cover;display:block}
.cover .img .ai-cap{position:absolute;right:14px;top:14px}
.qrcard{position:absolute;left:24px;bottom:24px;right:24px;background:#fff;color:var(--ink);border-radius:18px;padding:18px 22px;display:flex;gap:22px;align-items:center}
.cover .qrcard img{width:170px;height:170px;flex:none}
.qrcard b{font-size:36px;display:block;color:var(--navy)}
.qrcard span{font-size:24px;color:var(--muted)}
.missions{display:flex;gap:12px;margin-top:auto}
.missions .m{width:132px;text-align:center;font-size:20px;font-weight:700;color:#c9d6f0;line-height:1.25}
.missions .m .badge{width:96px;margin:0 auto 8px}
/* word cloud */
.cloudbox{flex:1;background:rgba(255,255,255,.96);border-radius:28px;padding:30px 50px;display:flex;align-items:center;justify-content:center;border:4px solid var(--gold);position:relative;overflow:hidden}
.cloudbox .cloud{max-width:100%;max-height:100%}
.cloudbox .demo-tag{position:absolute;left:22px;top:18px;font-size:22px}
.livecount{position:absolute;right:26px;top:18px;font-size:26px;font-weight:800;color:var(--navy)}
.livecount::before{content:"● ";color:var(--bad);animation:blink 1.2s infinite}
@keyframes blink{50%{opacity:.2}}
/* votes */
.vrow{display:grid;grid-template-columns:110px 1fr 220px;gap:28px;align-items:center;background:rgba(255,255,255,.07);border:3px solid rgba(255,255,255,.15);border-radius:22px;padding:20px 30px;margin-bottom:22px;position:relative}
.vrow .n{font-size:80px;font-weight:900;color:var(--gold2);text-align:center}
.vrow .s{font-size:40px;font-weight:700}
.vrow .bar{grid-column:2/3;height:30px;background:rgba(255,255,255,.12);border-radius:16px;overflow:hidden;margin-top:12px}
.vrow .bar i{display:block;height:100%;background:linear-gradient(90deg,var(--sky),var(--blue));border-radius:16px;transition:width .6s}
.vrow .pct{font-size:64px;font-weight:900;text-align:right}
.vrow.lie{border-color:var(--bad);background:rgba(210,69,59,.18)}
.vrow.lie::after{content:"LIE 假话";position:absolute;right:260px;top:50%;transform:translateY(-50%) rotate(-8deg);font-size:54px;font-weight:900;color:#ff7b70;border:6px solid #ff7b70;padding:0 18px;border-radius:12px}
.p-btn{font-family:var(--font);font-size:32px;font-weight:900;background:var(--gold);color:var(--deep);border:0;border-radius:14px;padding:14px 34px;cursor:pointer;min-height:64px}
.p-btn.ghost{background:transparent;color:#fff;border:3px solid rgba(255,255,255,.4)}
/* vocab */
.vocab{display:grid;grid-template-columns:520px 1fr;gap:80px;align-items:center;flex:1}
.vocab .icon{width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(29,95,209,.55),rgba(10,35,80,.2) 70%);display:flex;align-items:center;justify-content:center;border:4px dashed rgba(244,210,122,.45)}
.vocab .icon svg{width:360px;height:360px}
.vocab .w{font-size:200px;font-weight:900;line-height:1;letter-spacing:-.02em}
.vocab .ipa{font-size:44px;color:#c9d6f0;margin-top:10px;font-family:"Noto Sans","Segoe UI","Lucida Sans Unicode",sans-serif}
.vocab .cn{font-size:80px;font-weight:900;color:var(--gold2);margin-top:14px}
.vocab .ex{font-size:44px;margin-top:30px;border-left:10px solid var(--gold);padding-left:26px;line-height:1.3}
.vocab .ex .zh{display:block;font-size:30px;color:#a9b9d8}
.majors{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.majors span{font-size:26px;font-weight:700;background:rgba(255,255,255,.1);border:2px solid rgba(255,255,255,.3);border-radius:40px;padding:6px 20px}
/* course */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:36px;margin-top:10px}
.stat{background:rgba(255,255,255,.08);border:3px solid rgba(244,210,122,.5);border-radius:24px;padding:26px 34px}
.stat b{display:block;font-size:120px;font-weight:900;line-height:1;color:var(--gold2)}
.stat span{font-size:34px;font-weight:700}
.stat small{display:block;font-size:26px;color:#a9b9d8;margin-top:6px}
.abar{display:flex;height:150px;border-radius:20px;overflow:hidden;margin-top:44px;border:3px solid rgba(255,255,255,.2)}
.abar div{display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:28px;font-weight:800;text-align:center;line-height:1.15}
.abar div b{font-size:54px}
.abar .a1{background:#3a5b8f}.abar .a2{background:#2f6db3}.abar .a3{background:#24508a}.abar .a4{background:var(--gold);color:var(--deep)}.abar .a5{background:#0c1d3d}
.callout{margin-top:26px;font-size:40px;font-weight:800;color:var(--gold2)}
/* leaderboard */
.board{display:grid;grid-template-columns:1.3fr .7fr;gap:60px;flex:1}
.lb{display:flex;flex-direction:column;gap:6px}
.lb .r{display:grid;grid-template-columns:80px 150px 1fr 80px;align-items:center;gap:18px;font-size:30px;font-weight:800;height:58px}
.lb .r .rank{font-size:36px;color:var(--gold2);text-align:center}
.lb .r .bar{height:32px;background:rgba(255,255,255,.1);border-radius:10px;overflow:hidden}
.lb .r .bar i{display:block;height:100%;background:linear-gradient(90deg,var(--gold),var(--gold2));transition:width .6s}
.lb .r.top .bar i{background:linear-gradient(90deg,#ffcc3d,#fff0b3)}
.badges{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;align-content:start}
.badges .b{text-align:center;font-size:24px;font-weight:700}
.badges .badge{width:118px;margin:0 auto 6px}
/* notes */
.notes{display:none}
body.show-notes .p-slide.active .notes{display:block;position:absolute;left:120px;right:120px;bottom:84px;background:#fffbe6;color:#3b2f10;border:4px solid var(--gold);border-radius:16px;padding:18px 26px;font-size:26px;line-height:1.45;z-index:6}
.notes::before{content:"Teacher notes 教师备注 (N)";display:block;font-weight:900;color:#7a5600}