:root{--navy:#050927;--blue:#0867ff;--cyan:#0dd7ff;--purple:#6d28d9;--pink:#f54aa5;--yellow:#ffd85a;--green:#19b97b;--text:#101936;--muted:#65738e;--line:#e6ebf5;--bg:#f7f9ff;--card:#fff;--shadow:0 18px 45px rgba(8,15,59,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}button,input{font:inherit}a{text-decoration:none;color:inherit}.container{width:min(1320px,calc(100% - 32px));margin:auto}
.header{position:sticky;top:0;z-index:60;background:rgba(5,9,39,.96);backdrop-filter:blur(16px);border-bottom:1px solid rgba(255,255,255,.08)}.nav{height:68px;display:flex;align-items:center;gap:18px;position:relative}.logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:950;line-height:.9;white-space:nowrap}.logo-mark{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--cyan),var(--blue));box-shadow:0 0 24px rgba(13,215,255,.4)}.logo .wave{color:var(--cyan)}.logo small{font-size:10px;letter-spacing:.5em;color:#d9e7ff}.menu{display:flex;align-items:center;justify-content:center;gap:6px;flex:1}.menu a{color:#fff;font-size:14px;font-weight:850;padding:11px 13px;border-radius:11px}.menu a:hover{background:#211063}.nav-actions{display:flex;gap:9px}.icon-btn,.mobile-menu-btn{width:42px;height:42px;border-radius:12px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.06);color:#fff;display:grid;place-items:center;cursor:pointer;font-size:18px}.mobile-menu-btn{display:none}.top-pill{padding:12px 15px;border-radius:12px;background:linear-gradient(135deg,#3715d7,var(--purple));color:#fff;font-size:13px;font-weight:900;white-space:nowrap}
.search-pop{display:none;position:absolute;right:0;top:58px;width:min(460px,calc(100vw - 24px));background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 24px 60px rgba(0,0,0,.22);overflow:hidden}.search-pop.open{display:block}.search-box{padding:12px;border-bottom:1px solid var(--line)}.search-box input{width:100%;border:1px solid #d7e0f0;border-radius:12px;padding:13px;outline:none}.search-list{max-height:360px;overflow:auto;padding:8px}.search-item{display:flex;align-items:center;gap:10px;padding:11px;border-radius:11px}.search-item:hover{background:#f3f6ff}.search-item b{display:block;font-size:14px}.search-item small{display:block;color:var(--muted);margin-top:2px}.search-emoji{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:linear-gradient(135deg,#eef4ff,#f2eaff)}
.hero{position:relative;overflow:hidden;background:radial-gradient(circle at 78% 25%,rgba(13,215,255,.25),transparent 25rem),radial-gradient(circle at 20% 50%,rgba(109,40,217,.35),transparent 24rem),linear-gradient(135deg,#03102f,#071653 55%,#082f49);color:#fff}.hero:before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(155deg,rgba(255,255,255,.04) 0 1px,transparent 1px 24px)}.hero-inner{position:relative;padding:44px 0 74px}.crumb{display:inline-flex;padding:9px 13px;border-radius:999px;background:rgba(4,12,50,.5);border:1px solid rgba(150,175,255,.35);font-size:13px;font-weight:850}.hero-grid{display:grid;grid-template-columns:1fr 320px;align-items:center;gap:30px}.hero h1{font-size:clamp(38px,5vw,64px);line-height:1.02;letter-spacing:-.05em;margin:18px 0 12px}.hero h1 span{background:linear-gradient(90deg,#38bdf8,#c084fc);-webkit-background-clip:text;color:transparent}.hero p{max-width:760px;color:#eef6ff;font-size:17px;line-height:1.65;margin:0}.hero-art{height:210px;border-radius:28px;border:1px solid rgba(255,255,255,.18);background:linear-gradient(135deg,rgba(13,215,255,.18),rgba(109,40,217,.45));display:grid;place-items:center;font-size:92px;box-shadow:0 25px 70px rgba(13,215,255,.2)}
.main{position:relative;z-index:3;margin-top:-38px;padding-bottom:48px}.layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:26px;align-items:start}.game-card,.info-card,.side-card{background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}.game-card{padding:24px}.game-top{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:17px}.game-top h2{margin:0;font-size:27px}.score-row{display:flex;gap:8px;flex-wrap:wrap}.score-chip{padding:9px 12px;border-radius:999px;background:#f2f6ff;border:1px solid #dae4fb;font-size:13px;font-weight:900}.score-chip span{color:var(--blue)}
.game-stage{min-height:410px;border:1px solid #dfe6f4;border-radius:22px;background:radial-gradient(circle at 20% 20%,rgba(13,215,255,.10),transparent 18rem),linear-gradient(180deg,#fbfdff,#f3f7ff);padding:24px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;overflow:hidden;position:relative}.prompt{font-size:clamp(22px,4vw,34px);font-weight:950;margin-bottom:20px}.objects{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;max-width:760px;margin-bottom:24px}.object{font-size:48px;animation:pop .3s ease both}.object.balloon{animation:float 2.5s ease-in-out infinite alternate}.equation{font-size:clamp(44px,7vw,74px);font-weight:950;letter-spacing:.02em;margin-bottom:24px;color:#172554}.sequence{display:flex;flex-wrap:wrap;justify-content:center;gap:11px;margin-bottom:24px}.num-box{min-width:66px;padding:15px 12px;border-radius:16px;background:#fff;border:2px solid #dce5f6;font-size:27px;font-weight:950;box-shadow:0 8px 18px rgba(8,15,59,.06)}.num-box.missing{border-style:dashed;color:var(--purple);background:#f7f0ff}.answers{display:flex;flex-wrap:wrap;justify-content:center;gap:12px}.answer-btn{min-width:92px;padding:15px 19px;border:0;border-radius:15px;background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;font-size:20px;font-weight:950;cursor:pointer;box-shadow:0 12px 24px rgba(86,51,211,.2);transition:.18s}.answer-btn:hover{transform:translateY(-2px)}.answer-btn.correct{background:linear-gradient(135deg,#13a86e,#28d18f)}.answer-btn.wrong{background:linear-gradient(135deg,#ef4444,#f97316)}.feedback{min-height:34px;margin-top:18px;font-size:18px;font-weight:900}.next-btn{margin-top:12px;border:0;border-radius:13px;padding:12px 18px;background:#101936;color:#fff;font-weight:900;cursor:pointer;display:none}.progress{height:9px;border-radius:999px;background:#e9eef7;overflow:hidden;margin-top:18px}.progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--cyan),var(--purple));transition:.25s}.celebrate{position:absolute;inset:0;pointer-events:none;overflow:hidden}.confetti{position:absolute;font-size:24px;animation:fall 1.4s linear forwards}
.info-card{padding:25px;margin-top:18px}.info-card h2{margin:0 0 13px;font-size:25px}.info-card p,.info-card li{color:#334563;line-height:1.75}.related{display:grid;grid-template-columns:repeat(3,1fr);gap:11px}.related a{padding:14px;border:1px solid var(--line);border-radius:14px;background:#f8fbff;font-weight:850;font-size:13px}.sidebar{position:sticky;top:86px}.ad{min-height:300px;padding:10px;margin-bottom:18px;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:var(--shadow);text-align:center}.ad-label{display:block;font-size:10px;letter-spacing:.12em;color:#6b7890;font-weight:900;text-transform:uppercase;margin-bottom:6px}.side-card{padding:20px;margin-bottom:18px}.side-card h3{margin:0 0 12px}.side-card p,.side-card li{color:#425472;line-height:1.65;font-size:14px}.side-card ul{padding-left:20px}.quick-links{display:grid;gap:8px}.quick-links a{padding:11px 12px;border-radius:12px;background:#f7f9ff;border:1px solid var(--line);font-size:13px;font-weight:850}
.footer{background:linear-gradient(135deg,#03102e,#061b4d);color:#d7e3ff;padding:34px 0 18px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:28px}.footer p{color:#c8d4f3;line-height:1.55}.footer h3{color:#fff;font-size:15px;margin:0 0 10px}.footer a{display:block;color:#d7e3ff;font-size:14px;margin:7px 0}.subscribe{display:flex;gap:8px}.subscribe input{min-width:0;flex:1;padding:11px;border:0;border-radius:8px;background:#1f2937;color:#fff}.subscribe button{border:0;border-radius:8px;background:var(--purple);color:#fff;font-weight:900;padding:11px 14px}.footer-bottom{margin-top:22px;padding-top:14px;border-top:1px solid rgba(255,255,255,.1);display:flex;justify-content:space-between;color:#aebce0;font-size:13px}
body.dark{--bg:#070b1f;--card:#0f1734;--text:#eef4ff;--muted:#a9b8d8;--line:rgba(255,255,255,.12)}body.dark .game-stage{background:radial-gradient(circle at 20% 20%,rgba(13,215,255,.07),transparent 18rem),linear-gradient(180deg,#111a38,#0d1530);border-color:rgba(255,255,255,.12)}body.dark .score-chip,body.dark .num-box,body.dark .related a,body.dark .quick-links a{background:#121f4a;border-color:rgba(255,255,255,.12);color:#fff}body.dark .search-pop{background:#0f1734;border-color:rgba(255,255,255,.12)}body.dark .search-item:hover{background:#17234b}body.dark .ad{background:#0f1734;border-color:rgba(255,255,255,.12)}body.dark .info-card p,body.dark .info-card li,body.dark .side-card p,body.dark .side-card li{color:#cbd7f1}
@keyframes pop{from{transform:scale(.4);opacity:0}to{transform:scale(1);opacity:1}}@keyframes float{to{transform:translateY(-12px)}}@keyframes fall{to{transform:translateY(460px) rotate(400deg);opacity:0}}
@media(max-width:1000px){.menu{display:none}.top-pill{display:none}.mobile-menu-btn{display:grid}.menu.open{display:flex;position:absolute;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;background:#071047;padding:12px;border-radius:15px}.hero-grid,.layout{grid-template-columns:1fr}.hero-art{display:none}.sidebar{position:static}.ad{display:none}.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.container{width:calc(100% - 22px)}.nav{gap:7px}.logo-mark{width:38px;height:38px}.nav-actions{margin-left:auto}.game-card{padding:14px}.game-stage{padding:16px;min-height:390px}.game-top{align-items:flex-start;flex-direction:column}.related{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column;text-align:center;gap:7px}.search-pop{position:fixed;top:74px;left:11px;right:11px;width:auto}.object{font-size:40px}.answer-btn{min-width:74px;padding:13px 15px}.hero-inner{padding:36px 0 66px}}