:root{--b:#00cdff;--bd:#00b0dd;--y:#ffd900;--g:#4b4b4b;--l:#afafaf;--bg:#f7f7f7;--sh:0 4px 18px rgba(0,0,0,.09)}
*{box-sizing:border-box;margin:0;-webkit-tap-highlight-color:transparent}
body{font-family:'DIN Round Pro','Nunito',sans-serif;font-weight:700;color:var(--g);background:var(--bg)}
a{color:inherit;text-decoration:none}
header{height:64px;background:var(--b);display:flex;align-items:center;gap:18px;padding:0 24px;position:sticky;top:0;z-index:5}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-size:27px;font-weight:800;letter-spacing:-.5px}
.search{flex:1;max-width:520px;height:40px;border:0;border-radius:10px;padding:0 16px;background:rgba(255,255,255,.28);color:#fff;font:inherit;outline:0}
.search::placeholder{color:rgba(255,255,255,.85)}
nav{margin-left:auto;display:flex;gap:22px}nav a,nav label{color:#fff;font-size:14px;letter-spacing:.6px;text-transform:uppercase;height:64px;display:flex;align-items:center;cursor:pointer;border-bottom:3px solid transparent}nav a.on{border-color:#fff}
body.inStudy header{display:none}
main{max-width:1100px;margin:0 auto;padding:24px 16px 80px}
h2{font-size:22px;margin:30px 0 16px}.muted{color:var(--l)}
.hero{border-radius:14px;background:#8549ba;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:30px 44px;margin-bottom:8px}
.hero h1{font-size:34px;text-transform:uppercase;line-height:1.1}.hero p{margin:8px 0 18px;opacity:.9}
.hero .btn{display:inline-block;background:#fff;color:#8549ba;border-radius:12px;padding:12px 26px;box-shadow:0 4px 0 #d9c4ee;letter-spacing:.5px}
.row{display:flex;gap:22px;overflow-x:auto;padding:6px 4px 18px;scroll-snap-type:x proximity}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:22px}
.tile{flex:0 0 170px;scroll-snap-align:start;transition:transform .18s}.tile:hover{transform:translateY(-4px)}
.tile b{display:block;margin-top:12px;font-size:16px}.tile small{color:var(--l);font-size:13px}
.cv{aspect-ratio:1;border-radius:22px;display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.95);font-size:64px;font-weight:800;box-shadow:0 5px 0 rgba(0,0,0,.12),var(--sh);overflow:hidden}.cv img{width:100%;height:100%;object-fit:cover}
.dv{display:flex;gap:28px;align-items:flex-start}.side{width:230px;flex:none}.side .cv{width:100%;font-size:80px}.side h1{font-size:26px;margin:18px 0 6px}.side p{color:var(--l);font-size:15px;margin-bottom:18px}
.btn2{display:block;text-align:center;border:2px solid #7ee3ff;color:#00b8ec;border-radius:12px;padding:11px;letter-spacing:.6px;box-shadow:0 3px 0 #bdeeff;cursor:pointer;background:#fff;font:inherit;width:100%}
.panel{flex:1;background:#fff;border-radius:18px;box-shadow:var(--sh);padding:8px 26px 30px;min-width:0}
.tabs{display:flex;border-bottom:2px solid #eee;margin-bottom:26px}.tabs a{flex:1;text-align:center;padding:16px;color:var(--l);letter-spacing:.6px;font-size:14px;cursor:pointer;border-bottom:3px solid transparent;margin-bottom:-2px}.tabs a.on{color:var(--b);border-color:var(--b)}
.lg{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:20px}
.lt{aspect-ratio:1;border-radius:18px;background:#fff;box-shadow:0 4px 0 #e5e5e5,0 6px 14px rgba(0,0,0,.06);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;font-size:32px;transition:transform .15s}.lt:hover{transform:translateY(-3px)}
.lt.cur{background:var(--y);box-shadow:0 5px 0 #e0b800}.lt.lock{background:#eef0f2;box-shadow:none;color:#cdd2d6;pointer-events:none}
.pb{width:70%;height:8px;background:#eee;border-radius:5px;overflow:hidden}.pb u{display:block;height:100%;background:var(--y)}
.cg{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:18px}
.ct{aspect-ratio:1;border-radius:20px;box-shadow:var(--sh);display:flex;align-items:center;justify-content:center;text-align:center;padding:12px;font-size:19px;cursor:pointer;background:#fff;overflow:hidden}.ct .b,.ct.bk .f{display:none}.ct.bk .b{display:block}.ct.off{opacity:.4}.ct img{max-width:100%;max-height:70px}
.fab{position:fixed;right:28px;bottom:28px;width:58px;height:58px;border-radius:50%;background:var(--b);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 18px rgba(0,205,255,.5);transition:transform .15s}.fab:hover{transform:scale(1.08)}
.study{min-height:100vh;background:#fff;display:flex;flex-direction:column;padding:18px 24px}
.top{display:flex;align-items:center;gap:18px;max-width:900px;width:100%;margin:0 auto}
.x{background:none;border:0;font-size:22px;color:#c4c4c4;cursor:pointer}
.bar{flex:1;height:12px;border-radius:8px;background:#eaeaea;overflow:hidden}.bar i{display:block;height:100%;width:0;background:var(--y);border-radius:8px;transition:width .45s cubic-bezier(.3,.9,.3,1)}
.stage{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;position:relative;padding-bottom:30px}
.lbl{color:#ffc800;font-size:18px;letter-spacing:.6px}
.scene{width:min(330px,80vw);height:min(390px,50vh);perspective:1200px;touch-action:pan-y;user-select:none;cursor:pointer}
.card3d{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.3,.9,.3,1)}.card3d.flip{transform:rotateY(180deg)}
.face,.qcard{background:#fff;border-radius:40px;box-shadow:0 6px 24px rgba(0,0,0,.12);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:24px;font-size:30px;text-align:center;color:var(--g);position:relative}
.face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden}.face.bk{transform:rotateY(180deg)}
.face img,.qcard img{max-width:85%;max-height:62%;object-fit:contain;pointer-events:none}
.spk{position:absolute;top:18px;right:20px;border:0;background:none;color:var(--b);cursor:pointer}
.go{width:min(330px,80vw);height:48px;border:0;border-radius:14px;background:var(--b);color:#fff;font:inherit;font-size:16px;letter-spacing:.6px;box-shadow:0 4px 0 var(--bd);cursor:pointer;transition:transform .1s}.go:active{transform:translateY(3px);box-shadow:none}
.hint{color:var(--l);font-size:15px;text-align:center}kbd{border:2px solid #ddd;border-radius:6px;padding:1px 6px;font:inherit;font-size:12px}
.tools{position:absolute;left:0;bottom:0}.tools button{border:0;background:none;color:#c8c8c8;cursor:pointer;padding:8px}.tools button:hover{color:var(--b)}
.qrow{display:flex;gap:40px;align-items:center;justify-content:center;flex-wrap:wrap;width:100%;max-width:900px}
.qcard{width:min(330px,80vw);height:min(330px,38vh)}.opts{display:flex;flex-direction:column;gap:14px;flex:1;min-width:260px;max-width:520px}
.opt{position:relative;border:2px solid #7ee3ff;background:#fff;color:#00b8ec;border-radius:16px;min-height:66px;font:inherit;font-size:22px;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:10px;box-shadow:0 3px 0 #bdeeff;padding:8px 40px;transition:background .15s}
.opt em{position:absolute;left:12px;font:700 12px 'Nunito';color:#bbb;border:2px solid #e3e3e3;border-radius:6px;padding:1px 6px}.opt img{height:80px;border-radius:10px}
.opt.ok{border-color:#58cc02;color:#58cc02;background:#e8f9da;box-shadow:0 3px 0 #a5e56b}.opt.no{border-color:#ff4b4b;color:#ff4b4b;background:#ffe6e6;box-shadow:0 3px 0 #ffb3b3}
.shake{animation:sh .4s}@keyframes sh{20%{transform:translateX(-12px)}40%{transform:translateX(10px)}60%{transform:translateX(-7px)}80%{transform:translateX(4px)}}
.fin{text-align:center;display:flex;flex-direction:column;align-items:center;gap:14px}.fin h1{font-size:34px;color:#ffc800}
.ov{position:fixed;inset:0;background:rgba(0,0,0,.35);display:flex;align-items:center;justify-content:center;z-index:20;animation:fi .2s}@keyframes fi{from{opacity:0}}
.md{background:#fff;border-radius:22px;padding:28px;width:min(380px,90vw);text-align:center;display:flex;flex-direction:column;gap:12px}.md h3{font-size:22px}.md p{color:var(--l)}
@media(max-width:720px){header{padding:0 12px;gap:10px}nav #exp,nav label{display:none}.hero{padding:22px;flex-direction:column;align-items:flex-start}.hero .cv{display:none}.dv{flex-direction:column}.side{width:100%;display:flex;gap:16px;align-items:center;flex-wrap:wrap}.side .cv{width:110px;font-size:48px}.side h1{margin:0}.panel{width:100%;padding:4px 14px 24px}.lg{grid-template-columns:repeat(3,1fr);gap:14px}.opts{min-width:0;width:100%}.qrow{gap:22px}}
.edm{max-width:900px}.ehead{display:flex;gap:22px;align-items:flex-start;flex-wrap:wrap;background:#fff;border-radius:18px;box-shadow:var(--sh);padding:24px;margin-bottom:28px}
.ecv{width:130px;height:130px;border-radius:22px;box-shadow:var(--sh);display:flex;align-items:center;justify-content:center;text-align:center;color:#bbb;font-size:12px;cursor:pointer;overflow:hidden;background:#fff;flex:none}.ecv img{width:100%;height:100%;object-fit:cover}
.ef{flex:1;min-width:220px;display:flex;flex-direction:column;gap:12px}.ef input,.ef select{border:0;border-bottom:2px solid #ddd;font:inherit;font-size:20px;padding:8px 2px;outline:0;color:var(--g);background:transparent}.ef input:focus,.ef select:focus{border-color:var(--b)}.ef select{font-size:15px;color:var(--l)}
.erow{display:flex;gap:14px;align-items:center;margin-bottom:22px}.erow>span{width:22px;color:var(--l)}
.eside{position:relative;flex:1;max-width:300px;aspect-ratio:1/1.05;background:#fff;border-radius:26px;box-shadow:var(--sh);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:34px 14px 14px;gap:6px}
.eside textarea{width:100%;border:0;resize:none;text-align:center;font:inherit;font-size:20px;color:var(--g);outline:0;flex:1;background:transparent}.eside img{max-width:80%;max-height:45%;border-radius:12px}
.pic{position:absolute;top:8px;left:12px;cursor:pointer;font-size:18px}.rm{position:absolute;top:8px;right:12px;border:0;background:none;color:#f55;cursor:pointer}
.ectl{display:flex;flex-direction:column;gap:4px}.ectl button{border:0;background:none;color:#c0c0c0;font-size:18px;cursor:pointer}.ectl button:hover{color:var(--b)}
@media(max-width:720px){.erow{gap:6px}.eside{aspect-ratio:1;border-radius:20px}}
.newd{display:inline-block;width:auto;padding:11px 24px;margin-bottom:16px}
.more{float:right;font-size:13px;color:var(--b);letter-spacing:.6px;margin-top:6px}
.sort{border:2px solid #dfe6ea;border-radius:10px;padding:8px;font:inherit;font-size:14px;color:var(--g);background:#fff}
.who{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;background:#fff;padding:24px;text-align:center}.who h1{font-size:30px}
.wl{display:flex;gap:18px;flex-wrap:wrap;justify-content:center}.wb{border:0;background:none;font:inherit;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--g)}
.wb i{width:84px;height:84px;border-radius:50%;color:#fff;font-size:38px;font-style:normal;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 0 rgba(0,0,0,.12);transition:transform .15s}.wb:hover i{transform:scale(1.08)}
.who input{border:2px solid #dfe6ea;border-radius:12px;padding:12px 16px;font:inherit;font-size:18px;text-align:center;outline:0;width:min(330px,80vw);color:var(--g)}.who input:focus{border-color:var(--b)}
@media(max-width:720px){nav{gap:12px}nav a{font-size:12px}nav a[data-r=""]{display:none}.search{min-width:0}}