:root{--ink:#102f4d;--navy:#08294c;--blue:#2166ee;--mint:#35d4a4;--orange:#ff9d42;--pink:#ff6688;--purple:#7457ef;--muted:#688099;--line:#dce8f3;--cream:#fffaf0;--shadow:0 16px 42px #123a6418}*{box-sizing:border-box}body{margin:0;color:var(--ink);font-family:Nunito,"Segoe UI",sans-serif;background:linear-gradient(135deg,#f7fbff,#fff9ee 55%,#edfff8);min-height:100vh}button,input{font:inherit}.hidden{display:none!important}header{height:70px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(15px,4vw,50px);position:sticky;top:0;z-index:10;background:#ffffffef;border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.brand{border:0;background:transparent;color:var(--navy);font-size:21px;font-weight:1000;display:flex;align-items:center;gap:10px;cursor:pointer}.brand span{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:var(--navy);color:white;font-size:25px;transform:rotate(-4deg)}.stats{display:flex;gap:9px}.stats b{border:1px solid var(--line);border-radius:99px;padding:8px 12px;background:white}.stats i{font-style:normal;color:var(--blue)}main{max-width:1160px;margin:auto;padding:28px 20px 55px}.hero{display:grid;grid-template-columns:1.35fr .75fr;border-radius:28px;overflow:hidden;background:linear-gradient(135deg,#082d58,#1761c6);color:white;box-shadow:0 20px 50px #164f9c2c;min-height:245px}.hero>div{padding:36px}.hero small,.catalog-title small{color:#a7caff;font-weight:1000;letter-spacing:1.2px}.hero h1{font-size:clamp(32px,4vw,49px);line-height:1.05;margin:12px 0}.hero p{font-size:18px;color:#dceaff}.hero img{width:100%;height:100%;object-fit:cover;object-position:34% center}.heading{display:flex;justify-content:space-between;align-items:end;margin:29px 0 15px}.heading h2{margin:0;font-size:25px;color:var(--navy)}.heading p{margin:4px 0;color:var(--muted)}.heading>strong{color:var(--blue)}.areas{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}.area{--accent:var(--blue);border:1px solid var(--line);background:white;border-radius:22px;padding:20px;text-align:left;box-shadow:var(--shadow);cursor:pointer;position:relative;overflow:hidden;transition:.2s}.area:hover{transform:translateY(-5px);box-shadow:0 21px 46px #123a6425}.area:after{content:"";width:90px;height:90px;border-radius:50%;position:absolute;right:-35px;top:-35px;background:var(--accent);opacity:.14}.area .icon,.area-icon{width:53px;height:53px;border-radius:16px;display:grid;place-items:center;font-size:28px;background:color-mix(in srgb,var(--accent) 16%,white)}.area h3{margin:14px 0 5px;color:var(--navy);font-size:19px}.area p{font-size:13px;color:var(--muted);height:37px;margin:0 0 16px}.mini{height:7px;background:#edf3f8;border-radius:99px;overflow:hidden}.mini i{display:block;height:100%;background:var(--accent)}.area footer{display:flex;justify-content:space-between;color:#8091a2;font-size:12px;font-weight:900;margin-top:7px}.area footer b{color:var(--accent)}.crumb{display:flex;gap:9px;align-items:center;color:#9aabba;margin-bottom:20px}.crumb button{border:0;background:transparent;color:var(--blue);font-weight:900;cursor:pointer}.catalog-title{display:flex;align-items:center;gap:18px;background:linear-gradient(135deg,#0b315c,#135eba);color:white;border-radius:24px;padding:26px 30px;margin-bottom:18px}.catalog-title .area-icon{background:#ffffff20}.catalog-title h1{margin:5px 0;font-size:32px}.catalog-title p{margin:0;color:#dceaff}.skill-list{display:grid;gap:10px}.skill-row{display:grid;grid-template-columns:55px 1fr auto;align-items:center;gap:15px;width:100%;border:1px solid var(--line);border-radius:17px;background:white;padding:14px 17px;text-align:left;box-shadow:0 8px 25px #123a640d;cursor:pointer;transition:.17s}.skill-row:hover{border-color:var(--blue);transform:translateX(4px)}.code{display:grid;place-items:center;width:47px;height:47px;border-radius:14px;color:var(--blue);background:#edf4ff;font-weight:1000}.skill-row h3{margin:0 0 3px;color:var(--navy);font-size:16px}.skill-row p{margin:0;color:var(--muted);font-size:13px}.skill-row .go{font-size:22px;color:var(--blue)}.practice-head{display:flex;align-items:center;gap:12px;margin-bottom:16px}.practice-head>button{width:43px;height:43px;border:1px solid var(--line);background:white;border-radius:13px;cursor:pointer}.practice-head small{font-weight:1000;color:var(--blue)}.practice-head h1{font-size:22px;margin:1px 0;color:var(--navy)}.run{margin-left:auto;display:flex;align-items:center;gap:10px}.run>span{width:155px;height:10px;background:#e2ecf5;border-radius:99px;overflow:hidden}.run i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--mint));transition:.35s}.game{background:white;border:1px solid var(--line);border-radius:27px;overflow:hidden;box-shadow:0 22px 58px #123a641b}.body{padding:clamp(25px,5vw,48px)}.kind{color:var(--blue);font-weight:1000;letter-spacing:1px}.body h2{font-size:clamp(25px,4vw,38px);line-height:1.2;color:var(--navy);margin:12px 0 22px}.visual{min-height:155px;padding:20px;border:2px dashed #c7dcf0;border-radius:20px;background:linear-gradient(145deg,#f0f7ff,#f6fffb);display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:11px;margin-bottom:21px}.group{display:flex;flex-wrap:wrap;gap:5px;max-width:110px;padding:10px;border:2px solid #accbff;background:white;border-radius:13px}.dot{width:17px;height:17px;border-radius:50%;background:linear-gradient(#4c89ff,#1856d3);box-shadow:inset 0 -3px #1746a7}.array{display:grid;gap:8px}.tile{width:25px;height:25px;border-radius:7px;background:var(--purple);box-shadow:inset 0 -4px #5140b1}.equation{font-size:clamp(30px,6vw,54px);font-weight:1000;color:var(--navy);letter-spacing:5px}.property{display:flex;align-items:center;gap:18px;font-size:34px;font-weight:1000}.property span{background:white;border:2px solid #bcd2ff;border-radius:16px;padding:14px}.estimate{font-size:30px;text-align:center;font-weight:1000}.answers{display:grid;grid-template-columns:repeat(2,1fr);gap:11px}.answer{border:2px solid var(--line);background:white;border-radius:15px;padding:17px;text-align:left;font-size:18px;font-weight:900;color:var(--ink);cursor:pointer}.answer:hover{border-color:var(--blue);transform:translateY(-2px)}.answer.correct{background:#e7fbf4;border-color:var(--mint);color:#147052}.answer.wrong{background:#fff0f4;border-color:var(--pink);color:#a32b48}.answer:disabled{transform:none}.entry{display:flex;gap:10px}.entry input{width:220px;border:3px solid var(--line);border-radius:15px;padding:14px 17px;font-size:24px;font-weight:1000}.entry button,.finish-actions button{border:0;background:var(--blue);color:white;border-radius:14px;padding:14px 21px;font-weight:1000;cursor:pointer}.helpers{display:flex;justify-content:space-between;margin-top:18px}.helpers button{border:0;background:transparent;color:var(--blue);font-weight:900;cursor:pointer}.hintbox{display:none;margin-top:13px;padding:14px 17px;border-radius:13px;background:#fff6d8;color:#72591a}.hintbox.show{display:block}.feedback{display:none;align-items:center;gap:14px;padding:19px clamp(25px,5vw,48px)}.feedback.show{display:flex}.feedback.good{background:#e7fbf3;color:#12664a}.feedback.bad{background:#fff0e4;color:#805020}.feedback>span{font-size:34px}.feedback>div{flex:1}.feedback strong{font-size:20px}.feedback p{margin:3px 0}.feedback button{border:0;background:var(--navy);color:white;border-radius:13px;padding:13px 18px;font-weight:1000;cursor:pointer}.finish{text-align:center;background:white;border:1px solid var(--line);border-radius:27px;padding:55px 25px;box-shadow:var(--shadow)}.finish>div:first-child{font-size:75px}.finish h1{font-size:38px;color:var(--navy);margin:10px}.finish p{color:var(--muted);font-size:18px}.finish-actions{display:flex;justify-content:center;gap:10px;margin-top:22px}.finish-actions button:last-child{background:white;color:var(--navy);border:2px solid var(--line)}#toast{position:fixed;bottom:22px;left:50%;transform:translate(-50%,120px);background:var(--navy);color:white;border-radius:13px;padding:12px 17px;font-weight:900;transition:.25s;z-index:20}#toast.show{transform:translate(-50%,0)}@media(max-width:900px){.areas{grid-template-columns:repeat(2,1fr)}.hero{grid-template-columns:1fr}.hero img{height:200px;object-position:center 36%}}@media(max-width:600px){header{height:62px}.brand{font-size:17px}.brand span{width:37px;height:37px}.stats b:first-child{display:none}main{padding:17px 12px 40px}.hero>div{padding:23px}.hero img{height:160px}.heading{align-items:start}.heading>strong{font-size:12px}.areas{gap:10px}.area{padding:15px;border-radius:17px}.area p{display:none}.skill-row{grid-template-columns:45px 1fr auto;padding:12px}.catalog-title{padding:21px}.catalog-title h1{font-size:25px}.run>span{width:80px}.body{padding:23px 17px}.answers{grid-template-columns:1fr}.feedback.show{flex-wrap:wrap}.feedback button{width:100%}.entry input{width:100%}}