:root{--ink:#1f2140;--muted:#6b6f8a;--bg:#f5f2ff;--p:#6c4cff;--p2:#8f75ff;--pink:#ff4f8b;--mint:#16c49a;--amber:#ffb020;--red:#ff4d5e;--blue:#3a8bff;--line:#e7e2f7;--card:#fff;--sh:0 8px 28px rgba(76,52,180,.10)}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0}
body{font-family:'Rubik',system-ui,sans-serif;color:var(--ink);background:var(--bg);background-image:radial-gradient(circle at 10% 0%,#ffe7f1 0,transparent 35%),radial-gradient(circle at 100% 20%,#e3f1ff 0,transparent 40%);min-height:100vh;font-size:18px;line-height:1.55;padding-bottom:84px}
button{font-family:inherit}
header.top{position:sticky;top:0;z-index:20;background:linear-gradient(120deg,#5b3df5,#8b5cf6 55%,#d946ef);color:#fff;padding:10px 14px;display:flex;align-items:center;gap:8px;box-shadow:0 4px 18px rgba(91,61,245,.3)}
.logo{font-weight:800;font-size:19px;flex:1;cursor:pointer;white-space:nowrap;display:flex;align-items:center;gap:6px}
.logo .owl{font-size:26px}
.chip{background:rgba(255,255,255,.18);border-radius:999px;padding:4px 10px;font-weight:700;font-size:14px;white-space:nowrap}
nav.bottom{position:fixed;bottom:0;left:0;right:0;z-index:30;background:#fff;border-top:1px solid var(--line);display:flex;justify-content:space-around;padding:6px 4px calc(6px + env(safe-area-inset-bottom));box-shadow:0 -6px 20px rgba(76,52,180,.08)}
nav.bottom button{background:none;border:none;display:flex;flex-direction:column;align-items:center;font-size:12px;font-weight:700;color:var(--muted);padding:4px 6px;border-radius:12px;cursor:pointer;min-width:58px;position:relative}
nav.bottom button span{font-size:23px;line-height:1.2}
nav.bottom button.on{color:var(--p);background:#f0ecff}
nav.bottom .badge{position:absolute;top:0;left:8px;background:var(--pink);color:#fff;border-radius:999px;font-size:11px;min-width:18px;height:18px;display:flex;align-items:center;justify-content:center;padding:0 4px}
main{max-width:880px;margin:0 auto;padding:16px 14px 30px}
.card{background:var(--card);border-radius:24px;padding:18px;box-shadow:var(--sh);margin-bottom:16px;border:1px solid #f0edfb}
h1{font-size:27px;margin:0 0 6px;line-height:1.25}
h2{font-size:21px;margin:2px 0 10px}
h3{font-size:19px;margin:18px 0 6px;color:var(--p)}
p{margin:6px 0}
.muted{color:var(--muted)}.small{font-size:14px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.center{text-align:center;justify-content:center}
.sp{justify-content:space-between}
.btn{font-size:18px;font-weight:700;border:none;border-radius:16px;padding:12px 20px;cursor:pointer;background:var(--p);color:#fff;box-shadow:0 4px 0 #4b30d6;transition:transform .08s,box-shadow .08s;display:inline-flex;align-items:center;gap:6px;justify-content:center}
.btn:active{transform:translateY(3px);box-shadow:0 1px 0 #4b30d6}
.btn.sec{background:#efeaff;color:var(--p);box-shadow:0 4px 0 #d9d0ff}
.btn.green{background:var(--mint);box-shadow:0 4px 0 #0e9a78}
.btn.pink{background:var(--pink);box-shadow:0 4px 0 #d12f69}
.btn.amber{background:var(--amber);box-shadow:0 4px 0 #d18a00;color:#3b2a00}
.btn.big{font-size:20px;padding:14px 26px}
.btn.wide{width:100%}
.btn:disabled{opacity:.5}
/* hero */
.hero{background:linear-gradient(135deg,#6c4cff,#b44cff 60%,#ff4f8b);color:#fff;position:relative;overflow:hidden;border:none}
.hero:after{content:'';position:absolute;width:220px;height:220px;border-radius:50%;background:rgba(255,255,255,.08);left:-60px;bottom:-90px}
.hero .cd{display:inline-flex;gap:6px;align-items:center;background:rgba(255,255,255,.2);padding:5px 14px;border-radius:999px;font-weight:700;margin-top:6px}
.ring{position:relative;width:118px;height:118px;flex:none}
.ring svg{transform:rotate(-90deg)}
.ring .v{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;font-weight:800;font-size:26px;line-height:1}
.ring .v small{font-size:12px;font-weight:600;opacity:.9;margin-top:4px}
.xpbar{height:12px;background:#eee9ff;border-radius:999px;overflow:hidden}
.xpbar i{display:block;height:100%;background:linear-gradient(90deg,#ffb020,#ff4f8b);border-radius:999px;transition:width .6s}
.hero .xpbar{background:rgba(255,255,255,.25)}
.mission{display:flex;gap:12px;align-items:center;border-radius:20px;padding:14px;background:linear-gradient(135deg,#fff7e0,#ffe9f2);border:2px solid #ffd98a;cursor:pointer}
.mission .ic{font-size:40px}
.quick{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.qa{border:none;border-radius:20px;padding:14px;text-align:right;color:#fff;cursor:pointer;font-size:16px;font-weight:700;display:flex;flex-direction:column;gap:2px;min-height:92px;box-shadow:var(--sh)}
.qa span{font-size:28px}
.qa small{font-weight:500;opacity:.92;font-size:13px}
/* topics */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.topic{display:flex;gap:12px;align-items:center;background:#fff;border-radius:20px;padding:12px;border:2px solid var(--line);cursor:pointer;text-align:right;font-size:16px;color:var(--ink);box-shadow:var(--sh);width:100%}
.topic .ti{width:58px;height:58px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:30px;flex:none;color:#fff}
.topic .tt{flex:1;min-width:0}
.topic b{display:block;font-size:17px;line-height:1.25}
.topic small{color:var(--muted);font-size:13px}
.mbar{height:8px;background:#eee;border-radius:999px;overflow:hidden;margin-top:6px}
.mbar i{display:block;height:100%;border-radius:999px}
.stars{color:var(--amber);letter-spacing:1px;font-size:16px;white-space:nowrap}
.tag{display:inline-block;font-size:12px;font-weight:700;padding:2px 8px;border-radius:999px;background:#fff1d6;color:#a86a00}
.tabs{display:flex;gap:8px;margin-bottom:12px;background:#f3f0ff;padding:5px;border-radius:16px}
.tabs button{flex:1;font-size:16px;font-weight:700;padding:9px;border-radius:12px;border:none;background:none;cursor:pointer;color:var(--muted)}
.tabs button.on{background:#fff;color:var(--p);box-shadow:0 2px 8px rgba(0,0,0,.08)}
/* math */
.fr{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;line-height:1.05;font-size:.88em;margin:0 .1em}
.fr>span:first-child{border-bottom:2px solid currentColor;padding:0 .22em 1px}
.fr>span:last-child{padding-top:1px}
.mx{display:inline-flex;align-items:center;gap:1px}
.mx .w{font-size:1.1em;font-weight:700}
.ex{unicode-bidi:isolate;direction:ltr;display:inline-block;font-weight:700;white-space:nowrap}
.big{font-size:24px}.huge{font-size:32px}
.idea,.tip,.warn{border-radius:16px;padding:10px 14px;margin:10px 0}
.idea{background:#eef6ff;border-right:6px solid var(--blue)}
.tip{background:#e9fbf4;border-right:6px solid var(--mint)}
.warn{background:#fff1f2;border-right:6px solid var(--red)}
.owlsay{display:flex;gap:10px;align-items:flex-start;margin:10px 0}
.owlsay .o{font-size:38px;line-height:1}
.owlsay .b{background:#fff;border:2px solid var(--line);border-radius:18px;border-top-right-radius:4px;padding:10px 14px;flex:1}
.example{background:#fffbf0;border:2px dashed #ffd27a;border-radius:16px;padding:10px 14px;margin:10px 0}
ol.steps{margin:6px 0;padding-right:24px}
ol.steps li{margin:5px 0}
.vert{display:inline-block;direction:ltr;text-align:right;font-family:'Courier New',monospace;font-size:24px;font-weight:700;background:#f7f5ff;padding:8px 16px;border-radius:12px;margin:6px 0;line-height:1.3}
.vert .ln{border-top:3px solid var(--ink)}
table.t{border-collapse:collapse;width:100%;margin:8px 0;font-size:16px}
table.t th,table.t td{border:2px solid var(--line);padding:6px;text-align:center}
table.t th{background:#f4f0ff}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:10px}
.gallery div{background:#fafaff;border-radius:14px;padding:6px;text-align:center;font-weight:700;font-size:14px}
.gallery svg{width:100%;height:auto}
.widget{background:#f8f6ff;border-radius:18px;padding:12px;margin:12px 0;border:2px solid #ece7ff}
.widget label{display:block;font-weight:700;margin:6px 0}
.widget input[type=range]{width:100%;accent-color:var(--p)}
.widget select{font-family:inherit;font-size:16px;padding:4px 8px;border-radius:10px}
.bar{display:flex;direction:ltr;border:3px solid var(--ink);border-radius:10px;overflow:hidden;margin:8px auto;max-width:520px}
.bar div{flex:1;text-align:center;padding:9px 0;font-weight:700;border-left:2px solid var(--ink);font-size:16px}
.bar div:first-child{border-left:none}
.bar div.on{background:#ffd166}
/* quiz */
.qtop{display:flex;justify-content:space-between;align-items:center;font-weight:700;color:var(--muted);font-size:14px;margin-bottom:6px;gap:8px}
.qbar{height:10px;background:#eee;border-radius:999px;overflow:hidden;margin-bottom:14px}
.qbar i{display:block;height:100%;background:linear-gradient(90deg,var(--p),var(--pink));transition:width .4s}
.prompt{font-size:21px;font-weight:500;margin:6px 0 12px}
.visual{text-align:center;margin:8px 0}
.visual svg{max-width:100%;height:auto}
.opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.opt{font-size:23px;font-weight:700;padding:12px 8px;border-radius:18px;border:3px solid var(--line);background:#fff;cursor:pointer;color:var(--ink);min-height:66px;box-shadow:0 3px 0 var(--line);transition:transform .08s}
.opt.small{font-size:17px}
.opt:active{transform:translateY(2px)}
.opt.right{background:#e3fbef;border-color:var(--mint);box-shadow:0 3px 0 var(--mint)}
.opt.wrong{background:#ffecee;border-color:var(--red);opacity:.75;box-shadow:none}
.opt:disabled{cursor:default}
.numin{display:flex;gap:10px;justify-content:center;align-items:center;flex-wrap:wrap}
.numin input{font-family:inherit;font-size:28px;font-weight:700;width:170px;text-align:center;padding:10px;border-radius:16px;border:3px solid var(--line);direction:ltr;color:var(--ink)}
.numin input:focus{outline:none;border-color:var(--p)}
.fb{border-radius:18px;padding:12px 16px;margin-top:14px;font-size:17px}
.fb.good{background:#e6fbf2;border:2px solid var(--mint)}
.fb.bad{background:#fff3f2;border:2px solid #ffb4a8}
.fb.hint{background:#fff9e3;border:2px solid var(--amber)}
.fb h4{margin:0 0 4px;font-size:19px}
details summary{cursor:pointer;font-weight:700;color:var(--p)}
svg.nl{max-width:100%;height:auto;touch-action:manipulation}
svg.nl .hit{cursor:pointer}
.res{text-align:center}
.res .st{font-size:52px;letter-spacing:6px}
/* games */
.ggrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
.gcard{border:none;border-radius:22px;padding:14px;color:#fff;text-align:right;cursor:pointer;min-height:150px;display:flex;flex-direction:column;gap:4px;box-shadow:var(--sh);position:relative;overflow:hidden;font-size:15px}
.gcard .gi{font-size:40px}
.gcard b{font-size:17px}
.gcard small{opacity:.92;flex:1}
.gcard .best{background:rgba(255,255,255,.25);border-radius:999px;padding:2px 10px;font-weight:700;font-size:13px;align-self:flex-start}
.ghud{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:10px;flex-wrap:wrap}
.ghud .chip{background:#f0ecff;color:var(--p)}
.timer{height:10px;background:#eee;border-radius:999px;overflow:hidden;margin-bottom:10px}
.timer i{display:block;height:100%;background:linear-gradient(90deg,var(--mint),var(--amber),var(--red));transition:width 1s linear}
.stage{background:linear-gradient(180deg,#eaf6ff,#fff);border-radius:20px;padding:12px;text-align:center;border:2px solid #dcefff}
.cup{display:inline-flex;flex-direction:column-reverse;width:46px;height:96px;border:3px solid var(--ink);border-top:none;border-radius:0 0 14px 14px;margin:4px;overflow:hidden;background:#fff;vertical-align:bottom}
.cup i{flex:1;border-top:1px dashed #c9c3e6}
.cup i.f{background:linear-gradient(180deg,#fff3c4,#ffd36b);border-top:1px solid #e6b84a}
.step{display:inline-flex;align-items:center;gap:6px;background:#fff;border:2px solid var(--line);border-radius:16px;padding:4px}
.step button{width:40px;height:40px;border-radius:12px;border:none;background:#efeaff;color:var(--p);font-size:24px;font-weight:800;cursor:pointer}
.step b{min-width:34px;text-align:center;font-size:26px}
.tok{display:inline-block;font-size:25px;font-weight:800;padding:5px 4px;margin:2px;border-radius:12px}
.tok.op{background:#efeaff;color:var(--p);cursor:pointer;min-width:40px;border:2px solid #d9d0ff}
.tok.op:active{transform:scale(.95)}
.tok.flash{background:#ffd166;animation:pop .4s}
.shake{animation:shake .4s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-8px)}75%{transform:translateX(8px)}}
.objs{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;direction:ltr;max-width:440px;margin:10px auto}
.objs.groups{gap:14px}
.grp{display:flex;gap:6px;padding:6px;border:2px dashed #c9c3e6;border-radius:14px}
.obj{width:42px;height:42px;border-radius:50%;border:3px solid var(--ink);background:#fff;cursor:pointer;transition:background .15s}
.obj.sq{border-radius:8px}
.obj.on{background:var(--pink);border-color:#b8245a}
.balloons{display:flex;justify-content:center;gap:16px;align-items:flex-end;margin:12px 0}
.balloon{width:120px;height:140px;border-radius:50% 50% 46% 46%;border:none;color:#fff;font-size:34px;font-weight:800;cursor:pointer;position:relative;box-shadow:inset -10px -12px 0 rgba(0,0,0,.08);display:flex;align-items:center;justify-content:center}
.balloon:after{content:'';position:absolute;bottom:-22px;left:50%;width:2px;height:22px;background:#999}
.keypad{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;max-width:300px;margin:10px auto;direction:ltr}
.keypad button{font-size:26px;font-weight:800;padding:12px 0;border-radius:14px;border:2px solid var(--line);background:#fff;cursor:pointer;color:var(--ink);box-shadow:0 3px 0 var(--line)}
.keypad button:active{transform:translateY(2px)}
.disp{font-size:34px;font-weight:800;min-height:52px;text-align:center;direction:ltr;background:#f7f5ff;border-radius:14px;padding:4px;max-width:300px;margin:0 auto}
/* rank */
.ladder{display:flex;flex-direction:column;gap:8px}
.rung{display:flex;align-items:center;gap:10px;padding:10px;border-radius:16px;background:#faf9ff;border:2px solid var(--line)}
.rung.me{background:linear-gradient(135deg,#efeaff,#ffeaf3);border-color:var(--p)}
.rung.lock{opacity:.5}
.rung .ri{font-size:30px}
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:10px}
.bdg{text-align:center;padding:10px 6px;border-radius:16px;background:#faf9ff;border:2px solid var(--line);font-size:13px;font-weight:700}
.bdg .bi{font-size:34px;display:block}
.bdg.off{filter:grayscale(1);opacity:.45}
.list .it{display:flex;gap:10px;align-items:center;padding:10px;border-radius:14px;border:2px solid var(--line);margin-bottom:8px;background:#fff}
.list .it .grow{flex:1;min-width:0}
input.code{font-family:monospace;width:100%;padding:10px;border-radius:12px;border:2px solid var(--line);font-size:14px;direction:ltr}
.toast{position:fixed;top:70px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 18px;border-radius:999px;font-weight:700;z-index:60;animation:pop .3s;box-shadow:var(--sh);white-space:nowrap}
.confetti{position:fixed;top:-40px;font-size:28px;pointer-events:none;z-index:50;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(110vh) rotate(540deg)}}
.pop{animation:pop .35s}
@keyframes pop{0%{transform:scale(.94);opacity:.6}60%{transform:scale(1.03)}100%{transform:scale(1);opacity:1}}
.cert{border:6px double var(--amber);background:#fffdf3;border-radius:22px;padding:20px;text-align:center}
.frog{transition:transform .5s cubic-bezier(.3,1.6,.5,1)}
@media (max-width:480px){.opt{font-size:21px}.prompt{font-size:19px}h1{font-size:23px}.balloon{width:104px;height:124px;font-size:30px}.chip{font-size:13px;padding:3px 8px}.logo{font-size:17px}}