/* ===== Phong cách bảng lật / Bikablo: viền đen vẽ tay, tô màu phẳng, bóng xám, ruy băng, ghim ===== */
:root{
  --ink:#1f1f1f;--paper:#fffdf6;--dots:#ebe5d2;--grey:#9AA0A6;
  --yellow:#FFD230;--yellow-l:#FFF1B8;--blue:#2E8CC9;--blue-l:#D3EAF8;--orange:#F28A2E;--orange-l:#FFE3C6;
  --red:#E8412D;--green:#3BA55D;--green-l:#D9F0DF;--pink-l:#FBD3D8;--mute:#6f6a5b;
  --hand:'Patrick Hand','Itim','Comic Sans MS','Segoe Print',cursive;--head:'Itim','Patrick Hand','Comic Sans MS',cursive;
  --r:11px 15px 12px 16px / 15px 11px 16px 12px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--hand);font-size:18px;line-height:1.35;color:var(--ink);background:var(--paper);
  background-image:radial-gradient(var(--dots) 1.2px,transparent 1.3px);background-size:26px 26px;min-height:100vh}
button{font-family:inherit;font-size:inherit;cursor:pointer;color:var(--ink)}
h1,h2,h3{margin:0;line-height:1.15;font-family:var(--head);font-weight:400}
.wrap{max-width:1000px;margin:0 auto;padding:0 18px}
a{color:var(--blue)}

/* ---- khối vẽ tay dùng chung: nền + viền lệch (::before), bóng xám (::after) ---- */
.card,.art,.judge,.lv,.btn,.tb,.opt,.err,.task,.box,.toast,.chip,.pl,.seg button,.rs button,.pod .b,.frame,details.auto{position:relative;isolation:isolate;border:0}
.card::before,.art::before,.judge::before,.lv::before,.btn::before,.tb::before,.opt::before,.err::before,.task::before,.box::before,.toast::before,.chip::before,.pl::before,.seg button::before,.rs button::before,.pod .b::before,.frame::before,details.auto::before{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;background:var(--fill,#fff);border:var(--bw,2.5px) solid var(--ink);border-radius:var(--r);filter:url(#wob)}
.card::after,.art::after,.judge::after,.btn::after,.box::after,.frame::after,.pod .b::after{
  content:"";position:absolute;inset:0;z-index:-2;pointer-events:none;transform:translate(var(--sx,5px),var(--sy,6px));background:rgba(31,31,31,.16);border-radius:var(--r);filter:url(#wob2)}

.card{--fill:var(--yellow-l);padding:18px 18px 16px}
.card.plain{--fill:#fff}.card.blue{--fill:var(--blue-l)}.card.orange{--fill:var(--orange-l)}.card.green{--fill:var(--green-l)}.card.yellow{--fill:var(--yellow-l)}.card.pink{--fill:var(--pink-l)}
.card h3{font-size:24px;margin-bottom:4px}
.card p{margin:0 0 12px;font-size:18px}

/* ---- đầu trang ---- */
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 0 12px;
  background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='8' viewBox='0 0 120 8'><path d='M0 4 Q10 0 20 4 T40 4 T60 4 T80 4 T100 4 T120 4' fill='none' stroke='%231f1f1f' stroke-width='2.2' stroke-linecap='round'/></svg>") repeat-x bottom/120px 8px}
.logo{display:flex;align-items:center;gap:10px;min-width:0}
.logo svg{width:38px;height:38px;flex:none}
.logo b{font-family:var(--head);font-weight:400;font-size:26px;white-space:nowrap}
.logo small{color:var(--mute);font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
@media(max-width:560px){.logo small{display:none}}
.top-r{display:flex;align-items:center;gap:12px;flex-shrink:0}
.chip{--fill:var(--blue-l);padding:2px 12px;font-size:16px}
.link{background:none;border:0;padding:4px 2px;font-size:18px;color:var(--ink);text-decoration:underline wavy var(--orange) 2px;text-underline-offset:5px}
.link:hover{color:var(--orange)}

/* ---- hero: poster ghim trên tường ---- */
.hero{padding:22px 4px 8px}
.paper{padding:22px 16px 6px;text-align:center;--fill:#fff}
.pin{position:absolute;top:-9px;width:20px;height:20px;border-radius:50%;background:var(--orange);border:3px solid var(--ink);z-index:3}
.pin.l{left:9%}.pin.r{right:9%}
.rib{display:block;width:min(640px,100%);margin:0 auto;overflow:visible}
.rib text{font-family:var(--head);font-size:42px;fill:var(--ink)}
.tag{font-family:var(--head);font-size:clamp(20px,3.6vw,26px);margin:8px 0 0;color:var(--ink)}
.tag u{text-decoration:underline wavy var(--orange) 2px;text-underline-offset:6px}
.hero-art{display:block;width:100%;height:auto;max-height:310px;margin-top:6px}

/* ---- tiêu đề mục: số tròn cam + gạch chân vẽ tay ---- */
.sec{margin:34px 0 16px;display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.sec .n{flex:none;width:38px;height:38px;border:3px solid var(--orange);border-radius:50%;display:inline-flex;align-items:center;justify-content:center;color:var(--orange);font-family:var(--head);font-size:22px;transform:rotate(-4deg)}
.sec h2{font-size:30px;padding-bottom:5px;background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='60' height='8' viewBox='0 0 60 8'><path d='M0 5 Q7 1 15 5 T30 5 T45 5 T60 5' fill='none' stroke='%23F28A2E' stroke-width='2.6' stroke-linecap='round'/></svg>") repeat-x bottom/60px 8px}
.sec small{color:var(--mute);font-size:17px}

.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(auto-fit,minmax(270px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.g3 .card:nth-child(3n+1){transform:rotate(-.6deg)}.g3 .card:nth-child(3n+2){transform:rotate(.5deg)}.g3 .card:nth-child(3n){transform:rotate(-.3deg)}

/* ---- nút ---- */
.btn{--fill:var(--yellow);--bw:2.8px;--sx:3px;--sy:4px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:9px 20px;font-family:var(--head);font-size:20px;text-decoration:none;color:var(--ink);transition:transform .08s;background:none}
.btn:hover{--fill:#FFC400}
.btn:active{transform:translate(2px,3px)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.ghost{--fill:#fff}.btn.ghost:hover{--fill:var(--yellow-l)}
.btn.blue{--fill:#8CC8EC}.btn.blue:hover{--fill:#6DB8E4}
.btn.sm{padding:5px 14px;font-size:17px}
.btn.block{display:flex;width:100%}
.row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.row.sp{justify-content:space-between}
.mt{margin-top:14px}.mt2{margin-top:26px}

/* ---- ô nhập ---- */
label.f{display:block;font-size:17px;margin:14px 0 5px;color:var(--ink)}
input[type=text],select{width:100%;font:inherit;font-size:20px;padding:8px 12px;border:2.8px solid var(--ink);border-radius:12px 9px 14px 8px / 9px 13px 8px 12px;background:#fff;color:var(--ink)}
input[type=text]:focus,select:focus{outline:none;background:var(--yellow-l)}
.code-in{font-family:var(--head);font-size:36px!important;letter-spacing:8px;text-transform:uppercase;text-align:center}
.back{background:none;border:0;color:var(--mute);font-size:18px;padding:16px 0 0}
.page{padding:6px 0 70px}
.hint{font-size:16px;color:var(--mute);margin:6px 0 0}

/* ---- phòng chờ ---- */
.roomcode{font-family:var(--head);font-size:clamp(46px,11vw,84px);letter-spacing:10px;line-height:1.05;color:var(--ink);text-shadow:4px 4px 0 var(--yellow)}
.qr svg{width:140px;height:140px;display:block;background:#fff;padding:6px;border:2.5px solid var(--ink);border-radius:8px}
.players{display:flex;flex-wrap:wrap;gap:12px}
.pl{--fill:var(--blue-l);padding:2px 14px;font-size:18px;display:inline-flex;gap:6px;align-items:center}
.pl:nth-child(3n+2){--fill:var(--orange-l)}.pl:nth-child(3n){--fill:var(--green-l)}
.pl.ok{--fill:var(--green-l)}.pl i{font-style:normal;color:var(--green);font-weight:700}

/* ---- chọn cấp: giấy note ---- */
.levels{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px}
.lv{--fill:#fff;padding:10px 12px;text-align:left;font-family:var(--head);font-size:20px;line-height:1.15;background:none}
.lv:nth-child(6n+1){--fill:var(--yellow-l)}.lv:nth-child(6n+2){--fill:var(--blue-l)}.lv:nth-child(6n+3){--fill:var(--orange-l)}.lv:nth-child(6n+4){--fill:var(--green-l)}.lv:nth-child(6n+5){--fill:var(--pink-l)}.lv:nth-child(6n){--fill:#E5DCF7}
.lv small{display:block;font-family:var(--hand);color:var(--mute);font-size:15px}
.lv.on{--bw:4px;transform:rotate(-1.5deg) scale(1.04)}
.lv.on .no{background:var(--orange);color:#fff}
.lv .no{display:inline-flex;width:26px;height:26px;border:2.5px solid var(--orange);color:var(--orange);border-radius:50%;align-items:center;justify-content:center;font-size:16px;margin-right:6px;background:#fff}
.seg{display:flex;flex-wrap:wrap;gap:10px}
.seg button{--fill:#fff;--bw:2.4px;padding:4px 14px;font-size:18px;background:none}
.seg button.on{--fill:var(--yellow);--bw:3.4px}
.seg button:disabled{opacity:.35;cursor:not-allowed}

/* ---- màn vẽ ---- */
.dhead{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:16px 0 8px}
.topic{font-family:var(--head);font-size:clamp(28px,6vw,44px)}
.topic small{display:block;font-family:var(--hand);font-size:16px;color:var(--mute)}
.timer{font-family:var(--head);font-size:54px;color:var(--red);min-width:80px;text-align:right;line-height:1}
.bar{height:16px;border:2.8px solid var(--ink);border-radius:10px 6px 10px 6px;margin-bottom:14px;background:#fff;overflow:hidden}
.bar i{display:block;height:100%;background:var(--orange);width:100%;transition:width .3s linear}
.dlay{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:26px;align-items:start}
@media(max-width:840px){.dlay{grid-template-columns:1fr}}
.frame{padding:10px;--fill:#fff;--sx:6px;--sy:7px}
.frame .tape{position:absolute;top:-12px;width:78px;height:24px;background:rgba(255,210,48,.75);border:2px solid rgba(31,31,31,.45);z-index:3}
.frame .tape.a{left:6%;transform:rotate(-6deg)}.frame .tape.b{right:6%;transform:rotate(5deg)}
.cv{display:block;width:100%;height:auto;background:#fff;touch-action:none;cursor:crosshair;border:2px solid rgba(31,31,31,.18)}
.poster-frame{max-width:540px;margin:0 auto}
.tools{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:18px}
.sw{width:38px;height:38px;border-radius:50%;border:3px solid var(--ink);padding:0;position:relative;transition:transform .1s}
.sw:hover{transform:scale(1.1)}
.sw.on{transform:scale(1.18);box-shadow:0 0 0 4px #fff,0 0 0 7px var(--orange)}
.sw.lock{opacity:.22;cursor:not-allowed}
.tb{--fill:#fff;--bw:2.4px;padding:3px 12px;font-size:17px;background:none}
.tb.on{--fill:var(--yellow);--bw:3.4px}
.sep{width:2px;height:28px;background:var(--ink);opacity:.25;margin:0 4px}
.side .card{margin-bottom:20px}
.tip{font-size:17px;margin:0 0 8px!important;padding-left:24px;position:relative}
.tip::before{content:"✱";position:absolute;left:0;color:var(--orange);font-weight:700}
.limit{font-size:17px;margin:8px 0 0!important}
.limit b{color:var(--red);font-size:21px}
.task{--fill:var(--blue-l);padding:8px 12px;font-size:17px;margin-bottom:16px}
.warnbar{background:#fff;border:2.5px dashed var(--red);color:var(--red);padding:6px 12px;font-size:17px;margin-top:14px;display:none;border-radius:10px}

/* ---- triển lãm: giấy ghim ---- */
.gal{display:grid;grid-template-columns:repeat(auto-fill,minmax(235px,1fr));gap:26px}
.art{--fill:#fff;padding:12px 10px 8px;--sx:4px;--sy:5px}
.art:nth-child(odd){transform:rotate(-.8deg)}.art:nth-child(even){transform:rotate(.7deg)}
.art img{display:block;width:100%;height:auto;border:2px solid rgba(31,31,31,.2)}
.art .cap{padding:8px 4px 2px;font-size:17px}
.art .cap b{display:block;font-family:var(--head);font-weight:400;font-size:21px}
.art .sc{position:absolute;top:-14px;right:-8px;min-width:48px;height:48px;padding:0 6px;border-radius:50%;background:var(--yellow);border:3px solid var(--ink);display:flex;align-items:center;justify-content:center;font-family:var(--head);font-size:22px;z-index:4;transform:rotate(8deg)}
.art .pin{position:absolute;top:-9px;left:50%;margin-left:-10px;width:20px;height:20px;border-radius:50%;background:var(--orange);border:3px solid var(--ink);z-index:3}

/* ---- đoán hình ---- */
.gbox{max-width:580px;margin:0 auto}
.gbox img{display:block;width:100%;border:3px solid var(--ink);background:#fff;box-shadow:6px 7px 0 rgba(31,31,31,.16)}
.opts{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:22px}
@media(max-width:480px){.opts{grid-template-columns:1fr}}
.opt{--fill:#fff;padding:12px 10px;font-family:var(--head);font-size:21px;text-align:center;background:none}
.opt:hover{--fill:var(--yellow-l)}
.opt.right{--fill:#BDE8C6;--bw:4px}.opt.wrong{--fill:var(--pink-l);--bw:4px}
.opt:disabled{cursor:default}
.prog{font-family:var(--head);color:var(--mute);font-size:20px;text-align:center;margin-bottom:10px}

/* ---- chấm điểm ---- */
.rub{margin-top:4px}
.rr{display:grid;grid-template-columns:1fr auto;gap:6px 10px;align-items:center;padding:8px 0;border-top:2px dashed rgba(31,31,31,.25)}
.rr .rt{font-size:18px}.rr .rt small{display:block;color:var(--mute);font-size:15px}
.rs{display:flex;gap:6px}
.rs button{--fill:#fff;--bw:2.2px;--r:50%;width:32px;height:32px;padding:0;font-size:17px;background:none}
.rs button.on{--fill:var(--orange);--bw:3px}
.jtot{font-family:var(--head);font-size:34px;color:var(--red);text-align:right;margin-top:6px}
.judge{--fill:#fff;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px;padding:16px;margin-bottom:26px}
@media(max-width:760px){.judge{grid-template-columns:1fr}}
.judge img{width:100%;border:2px solid rgba(31,31,31,.2)}

/* ---- bảng điểm: vở kẻ dòng ---- */
.lb{width:100%;border-collapse:collapse;font-size:19px}
.lb th{text-align:left;font-family:var(--head);font-weight:400;font-size:17px;color:var(--mute);padding:4px 8px;border-bottom:3px solid var(--ink)}
.lb td{padding:8px;border-bottom:2px dashed rgba(31,31,31,.25)}
.lb td.r,.lb th.r{text-align:right}
.lb .rk{font-family:var(--head);width:38px;color:var(--orange);font-size:24px}
.lb tr.me td{background:rgba(255,210,48,.35)}
.podium{display:flex;align-items:flex-end;justify-content:center;gap:18px;margin:26px 0;min-height:230px}
.pod{width:min(30%,180px);text-align:center}
.pod .nm{font-family:var(--head);font-size:22px;margin-bottom:8px;word-break:break-word}
.pod .b{--fill:var(--yellow);padding:12px 6px;font-family:var(--head);font-size:20px;display:flex;flex-direction:column;align-items:center;gap:6px;--sx:5px;--sy:6px}
.pod.p1 .b{height:170px}.pod.p2 .b{--fill:var(--blue-l);height:130px}.pod.p3 .b{--fill:var(--orange-l);height:104px}
.medal{width:46px;height:46px;border-radius:50%;border:3px solid var(--ink);background:#fff;display:flex;align-items:center;justify-content:center;font-size:26px}
.p1 .medal{background:var(--yellow)}.p2 .medal{background:#dfe5ea}.p3 .medal{background:#f0b27a}

.empty{color:var(--mute);text-align:center;padding:26px 10px}
.big-wait{text-align:center;padding:46px 10px}
.big-wait .ic svg{width:92px;height:92px}
.big-wait h2{font-size:34px;margin:12px 0 6px}
.toast{--fill:var(--yellow);position:fixed;left:50%;bottom:26px;transform:translateX(-50%);padding:10px 20px;z-index:50;max-width:90vw;font-size:18px}
.modal{position:fixed;inset:0;background:rgba(31,31,31,.5);z-index:40;display:flex;align-items:center;justify-content:center;padding:16px}
.modal .box{--fill:var(--paper);max-width:580px;width:100%;max-height:88vh;overflow:auto;padding:24px;isolation:isolate}
.modal ol{padding:0;list-style:none;margin:14px 0}
.modal li{display:flex;gap:12px;margin-bottom:14px}
.modal li .no{flex:none;width:32px;height:32px;border:3px solid var(--orange);color:var(--orange);border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--head);font-size:18px}
.modal li b{display:block;font-family:var(--head);font-weight:400;font-size:21px}.modal li span{font-size:17px}
.err{--fill:var(--pink-l);padding:12px 14px;margin:16px 0}
.err code{background:#fff;padding:1px 5px}
.hide{display:none!important}

/* ---- nhận xét tự động ---- */
details.auto{--fill:var(--blue-l);--bw:2.2px;margin:12px 0;font-size:16px}
details.auto summary{cursor:pointer;padding:5px 10px;font-family:var(--head);font-size:18px}
details.auto ul{margin:0;padding:0 12px 6px 28px}
details.auto li{margin-bottom:8px}
details.auto .av{float:right;color:var(--blue);font-family:var(--head);font-size:19px}
details.auto small{color:#444;font-size:15px}
details.auto .aunote{display:block;padding:0 10px 8px;color:var(--mute);font-size:14px}
@media print{.top,.btn{display:none}}

/* ===== đấu 1-1 ===== */
.mute{color:var(--mute);font-size:15px}
.or{display:flex;align-items:center;gap:10px;color:var(--mute);margin:30px 0 14px;font-size:17px}
.or::before,.or::after{content:"";flex:1;border-top:2px dashed rgba(31,31,31,.3)}
.row.nowrap{flex-wrap:nowrap}.row.nowrap .code-in{flex:1;min-width:0}
.vsrow{display:flex;align-items:flex-end;justify-content:center;gap:14px;margin:10px 0 4px}
.side-p{display:flex;flex-direction:column;align-items:center;gap:2px;font-family:var(--head);font-size:22px;width:120px;word-break:break-word}
.side-p.ghost{opacity:.3}
.pawn{width:68px;height:auto}
.vsmark{font-family:var(--head);font-size:36px;color:var(--orange);padding-bottom:38px}
.wait{font-family:var(--head);font-size:22px;margin:14px 0 0}
.dots::after{content:"";animation:dots 1.2s steps(4) infinite}
@keyframes dots{0%{content:""}25%{content:"."}50%{content:".."}75%{content:"..."}}
.chips{display:flex;flex-direction:column;gap:12px;align-items:center;margin-top:14px}
.chips .seg{justify-content:center}
.duelbar{display:flex;align-items:center;gap:10px;padding:14px 0 6px}
.vschip{display:inline-block;padding:1px 12px;font-family:var(--head);font-size:19px;border:2.5px dashed rgba(31,31,31,.45);border-radius:14px;max-width:34vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.vschip.me{border-style:solid;border-color:var(--ink);background:var(--blue-l)}
.vschip.ok{border-style:solid;border-color:var(--ink);background:var(--green-l)}
.vsm{font-family:var(--head);color:var(--orange)}
.duelbar .timer{margin-left:auto}
.timer.hot{animation:pulse .5s infinite alternate}
@keyframes pulse{to{transform:scale(1.18)}}
.topic{text-align:center}
.stage{margin:14px auto 0;max-width:640px}
.cd{position:absolute;inset:0;display:none;align-items:center;justify-content:center;background:rgba(255,253,246,.9);font-family:var(--head);font-size:clamp(90px,26vw,170px);color:var(--orange);text-shadow:5px 5px 0 var(--ink);z-index:5}
.cd.on{display:flex}
.tools{max-width:640px;margin:18px auto 0}
.tools .sep{margin:0 2px}
.tipline{text-align:center;color:var(--mute);margin:18px 0 0;font-size:18px}
.tally{text-align:center;font-family:var(--head);font-size:24px;margin:16px 0 4px}
.tally span{display:inline-block;min-width:36px;height:36px;border-radius:50%;border:3px solid var(--ink);background:var(--yellow);line-height:30px;font-size:22px;margin:0 4px}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:28px;max-width:780px;margin:18px auto 0}
@media(max-width:560px){.pair{gap:16px}.art .cap b{font-size:18px}}
.art.win::before{--fill:var(--yellow-l);--bw:4px}
.noimg{aspect-ratio:640/500;display:flex;align-items:center;justify-content:center;color:var(--mute);border:2px dashed rgba(31,31,31,.25)}
.rib text{font-size:46px}

/* ---------- xem hình chuẩn + kết quả 3 cột ---------- */
.study{max-width:520px;margin:6px auto 0;text-align:center}
.refframe{position:relative;background:#fff;border:3px solid var(--ink);border-radius:6px;padding:10px;box-shadow:5px 6px 0 rgba(31,31,31,.18);transform:rotate(-.6deg)}
.refbox{aspect-ratio:1/1;width:100%}
.refbox svg{display:block;width:100%;height:100%}
.study .refbox{max-width:340px;margin:0 auto}
.stepcap{font-family:var(--head);font-size:26px;margin:12px 0 2px;color:var(--ink)}
.timer.study{background:#9ED8F7}
.trio{display:grid;grid-template-columns:1fr 1fr 1fr;gap:22px;max-width:980px;margin:18px auto 0;align-items:start}
.art.ref{cursor:pointer;background:#FFF8D6}
.art.ref .refbox{padding:6px}
.art .cap small{font-size:14px;opacity:.7}
@media(max-width:700px){.trio{grid-template-columns:1fr 1fr;gap:16px}.trio .art.ref{grid-column:1/-1;order:-1;max-width:260px;margin:0 auto;width:100%}}

/* ---------- hình chuẩn thật + tự luyện ---------- */
.refbox img{display:block;width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply}
.refbox.tall{aspect-ratio:4/5}
.study .refbox.tall{max-width:300px}
.cv.tallcv{max-width:380px;margin:0 auto}
.art.ref .refbox{background:#fff}
.catgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:8px 0 14px}
.catbtn{position:relative;display:flex;flex-direction:column;align-items:center;gap:2px;padding:10px 6px 8px;background:#fff;border:3px solid var(--ink);border-radius:10px;cursor:pointer;font:inherit;color:var(--ink);box-shadow:3px 4px 0 rgba(31,31,31,.18)}
.catbtn .cimg{display:block;width:78px;height:78px}
.catbtn img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply}
.catbtn b{font-family:var(--head);font-weight:400;font-size:20px}
.catbtn small{font-size:14px;opacity:.65}
.catbtn.on{background:#FFE98A;transform:rotate(-1.2deg);box-shadow:4px 5px 0 var(--ink)}
.newbest{display:inline-block;margin-left:6px;padding:2px 10px;background:var(--orange);color:#fff;border:2px solid var(--ink);border-radius:12px;font-family:var(--head);font-size:18px;transform:rotate(-3deg)}
.mute{opacity:.7}
@media(max-width:480px){.catgrid{gap:8px}.catbtn .cimg{width:60px;height:60px}.catbtn b{font-size:17px}}

.timer.study{background:transparent!important;color:#2E8CC9;border-color:transparent!important}