.landing-kostek{color-scheme:dark;--page:#050b15;--page-soft:#081221;--surface:#0d192a;--surface-2:#111f33;--line:rgba(143,166,198,0.2);--text:#f7f9ff;--muted:#a8b4c8;--blue:#2d86ff;--cyan:#23d4ee;--violet:#8c55ff;--green:#20d6a2;--orange:#ff8a2b;--yellow:#ffc447;--shell:1180px}.landing-kostek *{box-sizing:border-box}.landing-kostek{scroll-behavior:smooth;margin:0;overflow-x:hidden;background:var(--page);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;letter-spacing:0}.landing-kostek:before{position:fixed;z-index:-1;inset:0;background:radial-gradient(circle at 12% 35%,rgba(31,131,255,.05),transparent 24%),radial-gradient(circle at 88% 66%,rgba(140,85,255,.04),transparent 22%);content:"";pointer-events:none}.landing-kostek a{color:inherit;text-decoration:none}.landing-kostek button,.landing-kostek input{font:inherit}.landing-kostek img{display:block;max-width:100%}.landing-kostek svg{width:20px;height:20px;stroke-width:1.9}.landing-kostek .section-shell{width:min(var(--shell),calc(100% - 40px));margin-inline:auto}.landing-kostek .site-header{position:sticky;z-index:50;top:0;height:72px;border-bottom:1px solid rgba(129,153,189,.14);background:rgba(5,11,21,.88);backdrop-filter:blur(18px)}.landing-kostek .nav-shell{display:grid;width:min(var(--shell),calc(100% - 40px));height:100%;margin-inline:auto;grid-template-columns:220px 1fr auto;align-items:center;gap:28px}.landing-kostek .brand{display:flex;align-items:center;width:178px;height:46px;overflow:hidden}.landing-kostek .brand img{width:190px;height:58px;-o-object-fit:contain;object-fit:contain;-o-object-position:left center;object-position:left center}.landing-kostek .main-nav{display:flex;justify-content:center;gap:30px}.landing-kostek .main-nav a{color:#b9c4d5;font-size:14px;font-weight:650;transition:color .16s ease}.landing-kostek .main-nav a:hover{color:white}.landing-kostek .nav-actions{display:flex;gap:10px}.landing-kostek .menu-toggle{display:none;width:42px;height:42px;place-items:center;border:1px solid var(--line);border-radius:7px;background:var(--surface);color:white}.landing-kostek .button{display:inline-flex;min-height:48px;align-items:center;justify-content:center;gap:10px;padding:0 22px;border:1px solid transparent;border-radius:7px;font-size:15px;font-weight:750;transition:transform .16s ease,background .16s ease,border-color .16s ease}.landing-kostek .button:hover{transform:translateY(-2px)}.landing-kostek .button-small{min-height:40px;padding-inline:17px;font-size:13px}.landing-kostek .button-primary{border-color:rgba(78,156,255,.76);background:linear-gradient(135deg,#258cff,#316bf4 62%,#6948ea);box-shadow:0 14px 32px rgba(39,113,241,.22);color:white}.landing-kostek .button-quiet,.landing-kostek .button-secondary{border-color:rgba(116,149,195,.28);background:rgba(12,24,41,.72);color:#e9eef8}.landing-kostek .button-quiet:hover,.landing-kostek .button-secondary:hover{border-color:rgba(66,143,255,.65);background:#101e31}.landing-kostek .button-light{background:white;color:#0b1424}.landing-kostek .hero{position:relative;min-height:min(790px,calc(100svh - 72px));overflow:hidden;border-bottom:1px solid rgba(110,144,190,.16);background:linear-gradient(90deg,rgba(5,11,21,.99),rgba(5,11,21,.94) 39%,rgba(6,14,29,.56) 68%,rgba(6,12,24,.9)),linear-gradient(180deg,#071120,#050b15)}.landing-kostek .hero-grid{position:absolute;inset:0;opacity:.16;background-image:linear-gradient(rgba(75,122,187,.18) 1px,transparent 0),linear-gradient(90deg,rgba(75,122,187,.18) 1px,transparent 0);background-size:74px 74px;-webkit-mask-image:linear-gradient(90deg,transparent,#000 55%,transparent);mask-image:linear-gradient(90deg,transparent,#000 55%,transparent)}.landing-kostek .hero-aura{position:absolute;border-radius:50%;filter:blur(90px);opacity:.27}.landing-kostek .hero-aura-blue{top:8%;right:14%;width:440px;height:440px;background:#1678ff}.landing-kostek .hero-aura-violet{right:-5%;bottom:-20%;width:420px;height:420px;background:#7443ff}.landing-kostek .hero-shell{position:relative;display:grid;min-height:min(790px,calc(100svh - 72px));grid-template-columns:.9fr 1.1fr;align-items:center;gap:18px;padding-block:52px 38px}.landing-kostek .hero-copy{position:relative;z-index:4;max-width:610px}.landing-kostek .eyebrow{display:inline-flex;align-items:center;gap:10px;margin-bottom:22px;color:#bcd0ea;font-size:13px;font-weight:750;text-transform:uppercase}.landing-kostek .status-dot{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 18px rgba(32,214,162,.75)}.landing-kostek .cta-copy h2,.landing-kostek .faq-heading h2,.landing-kostek .hero h1,.landing-kostek .momentum-copy h2,.landing-kostek .product-copy h2,.landing-kostek .section-heading h2{margin:0;font-weight:820;letter-spacing:0;line-height:1.03}.landing-kostek .hero h1{max-width:650px;font-size:72px}.landing-kostek .hero h1 span{color:transparent;background:linear-gradient(90deg,#26d5ef,#328cff 44%,#8c58ff);-webkit-background-clip:text;background-clip:text}.landing-kostek .hero-copy>p{max-width:600px;margin:25px 0 0;color:#afbdd1;font-size:18px;line-height:1.7}.landing-kostek .hero-actions{display:flex;gap:12px;margin-top:31px}.landing-kostek .store-availability{margin-top:27px}.landing-kostek .store-label{display:block;margin-bottom:9px;color:#8496ae;font-size:11px;font-weight:650}.landing-kostek .store-badges{display:flex;flex-wrap:wrap;gap:8px}.landing-kostek .store-badge{display:flex;min-width:154px;min-height:50px;align-items:center;gap:10px;padding:7px 14px;border:1px solid rgba(128,160,204,.28);border-radius:7px;background:rgba(10,21,37,.72);transition:border-color .16s ease,background .16s ease,transform .16s ease}.landing-kostek .store-badge:hover{border-color:rgba(71,151,255,.65);background:#0e1d31;transform:translateY(-2px)}.landing-kostek .store-badge>svg{width:24px;height:24px;color:white}.landing-kostek .store-badge small,.landing-kostek .store-badge span,.landing-kostek .store-badge strong{display:block}.landing-kostek .store-badge small{color:#8fa1b8;font-size:9px;line-height:1}.landing-kostek .store-badge strong{margin-top:3px;font-size:14px;line-height:1}.landing-kostek .hero-stage{position:relative;align-self:stretch;min-height:620px}.landing-kostek .hero-kostek{z-index:4;right:31%;width:min(455px,38vw);max-height:650px;filter:saturate(1.04) drop-shadow(0 30px 40px rgba(0,0,0,.38));animation:none}.landing-kostek .hero-kostek,.landing-kostek .hero-professor{position:absolute;bottom:-4%;-o-object-fit:contain;object-fit:contain}.landing-kostek .hero-professor{z-index:2;right:-8%;width:min(600px,49vw);max-height:760px;filter:saturate(1.02) drop-shadow(0 30px 40px rgba(0,0,0,.4))}.landing-kostek .stage-ring{position:absolute;border:1px solid rgba(70,153,255,.32);border-radius:50%;box-shadow:inset 0 0 60px rgba(48,123,246,.06),0 0 70px rgba(54,122,255,.08)}.landing-kostek .ring-one{right:5%;bottom:3%;width:510px;height:510px}.landing-kostek .ring-two{right:17%;bottom:15%;width:330px;height:330px;border-color:rgba(141,84,255,.25)}.landing-kostek .feature-orbit{position:absolute;z-index:6;inset:0;pointer-events:none}.landing-kostek .orbit-chip{position:absolute;display:flex;min-height:64px;align-items:center;gap:13px;padding:13px 18px;border:1px solid rgba(130,166,218,.36);border-radius:7px;background:rgba(9,20,36,.92);box-shadow:0 18px 36px rgba(0,0,0,.26);backdrop-filter:blur(12px)}.landing-kostek .orbit-chip svg{flex:0 0 auto;width:24px;height:24px;color:#52a3ff}.landing-kostek .orbit-chip span{color:#e4ebf6;font-size:13px;font-weight:750;white-space:nowrap}.landing-kostek .orbit-flashcards{top:11%;left:8%}.landing-kostek .orbit-dictionary{top:34%;left:3%}.landing-kostek .orbit-battle{top:58%;left:4%}.landing-kostek .orbit-xp{top:80%;left:10%}.landing-kostek .orbit-questions{top:12%;right:-3%}.landing-kostek .orbit-ai{top:36%;right:4%}.landing-kostek .orbit-streak{top:60%;right:-2%}.landing-kostek .orbit-achievements{top:81%;right:4%}.landing-kostek .orbit-ai svg,.landing-kostek .orbit-questions svg{color:#9c72ff}.landing-kostek .orbit-dictionary svg{color:#30d6a8}.landing-kostek .orbit-battle svg,.landing-kostek .orbit-streak svg{color:#ff963d}.landing-kostek .orbit-xp svg{color:#42a4ff}.landing-kostek .orbit-achievements svg{color:#ffc94c}.landing-kostek .intro{padding-block:105px 115px}.landing-kostek .section-heading{max-width:700px}.landing-kostek .section-heading.centered{margin-inline:auto;text-align:center}.landing-kostek .kicker{margin:0 0 12px;color:#54a2ff;font-size:13px;font-weight:800;text-transform:uppercase}.landing-kostek .faq-heading h2,.landing-kostek .momentum-copy h2,.landing-kostek .product-copy h2,.landing-kostek .section-heading h2{font-size:58px}.landing-kostek .cta-copy>p,.landing-kostek .faq-heading>p:last-child,.landing-kostek .momentum-copy>p,.landing-kostek .product-copy>p,.landing-kostek .section-heading>p:last-child{color:var(--muted);font-size:16px;line-height:1.7}.landing-kostek .intro-lead{display:grid;min-height:500px;grid-template-columns:.66fr 1fr;align-items:center;gap:64px}.landing-kostek .intro-lead .section-heading{max-width:760px}.landing-kostek .intro-student-stage{position:relative;display:grid;align-self:stretch;place-items:end center;overflow:hidden}.landing-kostek .intro-student-stage img{position:relative;z-index:2;width:390px;filter:drop-shadow(0 26px 34px rgba(0,0,0,.34))}.landing-kostek .journey{position:relative;display:grid;margin-top:32px;grid-template-columns:repeat(3,1fr);gap:16px}.landing-kostek .journey-step{position:relative;min-height:250px;padding:34px 30px 38px;border:1px solid rgba(132,166,214,.29);border-radius:8px;background:#101f32;overflow:hidden}.landing-kostek .journey-step:before{position:absolute;inset:0;opacity:.18;content:""}.landing-kostek .step-blue:before{background:linear-gradient(145deg,#2788ff,transparent 58%)}.landing-kostek .step-violet:before{background:linear-gradient(145deg,#8358ff,transparent 58%)}.landing-kostek .step-green:before{background:linear-gradient(145deg,#20d6a2,transparent 58%)}.landing-kostek .step-number{position:absolute;top:22px;right:25px;color:rgba(209,220,237,.27);font-size:42px;font-weight:850}.landing-kostek .step-copy{position:relative;z-index:2;max-width:255px}.landing-kostek .step-copy>svg{width:34px;height:34px;margin-bottom:30px;color:#56a4ff}.landing-kostek .step-violet .step-copy>svg{color:#9b70ff}.landing-kostek .step-green .step-copy>svg{color:#36d7aa}.landing-kostek .step-copy h3{margin:0 0 11px;font-size:22px}.landing-kostek .step-copy p{margin:0;color:#9eacc0;font-size:14px;line-height:1.6}.landing-kostek .product-band{padding-block:112px;border-block:1px solid rgba(125,156,200,.14);background:#07111e}.landing-kostek .product-layout{display:grid;grid-template-columns:.76fr 1.24fr;align-items:center;gap:70px}.landing-kostek .product-copy>p{max-width:475px}.landing-kostek .module-tabs{display:grid;max-width:420px;margin-top:30px;grid-template-columns:repeat(2,1fr);gap:8px}.landing-kostek .module-tab{display:flex;min-height:48px;align-items:center;gap:9px;padding:0 14px;border:1px solid var(--line);border-radius:7px;background:#0b1828;color:#a8b6ca;cursor:pointer}.landing-kostek .module-tab.active{border-color:rgba(60,142,255,.82);background:rgba(38,126,244,.14);color:white}.landing-kostek .module-tab.active svg{color:#4c9cff}.landing-kostek .app-preview{overflow:hidden;border:1px solid rgba(72,144,244,.42);border-radius:8px;background:#091524;box-shadow:0 38px 90px rgba(0,0,0,.3)}.landing-kostek .preview-topbar{display:flex;height:50px;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line);background:#0b1727}.landing-kostek .preview-brand{display:flex;align-items:center;gap:8px;font-size:13px}.landing-kostek .preview-brand svg{color:#35bfff}.landing-kostek .preview-avatar{display:grid;width:28px;height:28px;place-items:center;border-radius:50%;background:#2478f1;font-size:10px;font-weight:800}.landing-kostek .preview-body{display:grid;min-height:460px;grid-template-columns:58px 1fr}.landing-kostek .preview-nav{display:grid;align-content:start;justify-items:center;gap:13px;padding-top:23px;border-right:1px solid var(--line);background:#08121f}.landing-kostek .preview-nav span{display:grid;width:34px;height:34px;place-items:center;border-radius:6px;color:#71839b}.landing-kostek .preview-nav .active{background:rgba(40,131,255,.15);color:#3691ff}.landing-kostek .preview-content{padding:30px 32px}.landing-kostek .preview-title{display:flex;align-items:center;gap:13px}.landing-kostek .preview-icon{display:grid;width:48px;height:48px;place-items:center;border-radius:7px;background:linear-gradient(145deg,#2892ff,#315ee8)}.landing-kostek .preview-title small{color:#8da0b8}.landing-kostek .preview-title h3{margin:3px 0 0;font-size:22px}.landing-kostek .preview-progress{height:7px;margin:27px 0 22px;border-radius:7px;background:#17263a;overflow:hidden}.landing-kostek .preview-progress span{display:block;width:38%;height:100%;border-radius:inherit;background:linear-gradient(90deg,#2e8eff,#28cdea)}.landing-kostek .preview-card{display:grid;min-height:190px;align-content:center;gap:15px;padding:28px;border:1px solid var(--line);border-radius:7px;background:#0d1a2b;text-align:center}.landing-kostek .preview-card small{color:#7fa8df;font-weight:700}.landing-kostek .preview-card strong{font-size:19px;line-height:1.45}.landing-kostek .answer-row{display:flex;justify-content:center;gap:8px}.landing-kostek .answer-row span{min-width:38px;padding:7px 10px;border:1px solid rgba(72,143,240,.3);border-radius:5px;color:#9fbae0;font-size:11px}.landing-kostek .preview-stats{display:grid;margin-top:18px;grid-template-columns:repeat(3,1fr);gap:8px}.landing-kostek .preview-stats span{padding:12px;border:1px solid rgba(120,151,193,.15);border-radius:6px;background:#0a1625}.landing-kostek .preview-stats b,.landing-kostek .preview-stats small{display:block}.landing-kostek .preview-stats b{font-size:17px}.landing-kostek .preview-stats small{margin-top:3px;color:#8394aa;font-size:10px}.landing-kostek .app-preview[data-current-module=questions]{border-color:rgba(145,85,255,.48)}.landing-kostek .app-preview[data-current-module=questions] .preview-icon,.landing-kostek .app-preview[data-current-module=questions] .preview-progress span{background:linear-gradient(90deg,#a157ff,#7140dc)}.landing-kostek .app-preview[data-current-module=dictionary]{border-color:rgba(32,214,162,.46)}.landing-kostek .app-preview[data-current-module=dictionary] .preview-icon,.landing-kostek .app-preview[data-current-module=dictionary] .preview-progress span{background:linear-gradient(90deg,#15c58e,#1ba77d)}.landing-kostek .app-preview[data-current-module=ai]{border-color:rgba(139,85,255,.48)}.landing-kostek .app-preview[data-current-module=ai] .preview-icon,.landing-kostek .app-preview[data-current-module=ai] .preview-progress span{background:linear-gradient(90deg,#8e4aff,#5d54ea)}.landing-kostek .product-gallery{position:relative;display:grid;gap:42px}.landing-kostek .product-gallery .product-copy{display:grid;max-width:none;grid-template-columns:1fr 1fr;align-items:end;gap:22px 70px}.landing-kostek .product-gallery .product-copy>p{max-width:530px;margin:0 0 5px;justify-self:end}.landing-kostek .product-gallery .product-copy .kicker{grid-column:1/-1;margin-bottom:-10px}.landing-kostek .screenshot-tabs{display:flex;grid-column:1/-1;flex-wrap:wrap;gap:8px}.landing-kostek .screenshot-tab{display:flex;min-height:46px;align-items:center;gap:9px;padding:0 15px;border:1px solid var(--line);border-radius:7px;background:#0a1728;color:#90a1b7;cursor:pointer}.landing-kostek .screenshot-tab svg{width:18px;height:18px}.landing-kostek .screenshot-tab.active{border-color:rgba(65,151,255,.78);background:rgba(41,129,247,.17);color:#f3f7ff}.landing-kostek .screenshot-tab.active svg{color:#4b9fff}.landing-kostek .screenshot-stage{position:relative;width:calc(100% - 170px);aspect-ratio:2.025/1;border:1px solid rgba(72,144,244,.5);border-radius:8px;background:#06101c;box-shadow:0 38px 90px rgba(0,0,0,.32);overflow:hidden}.landing-kostek .gallery-professor{position:absolute;z-index:6;right:-18px;bottom:-34px;width:500px;height:auto;pointer-events:none;filter:drop-shadow(0 26px 30px rgba(0,0,0,.42))}.landing-kostek .product-shot{position:absolute;inset:0;margin:0;opacity:0;visibility:hidden;transition:opacity .18s ease}.landing-kostek .product-shot.active{opacity:1;visibility:visible}.landing-kostek .product-shot img{width:100%;height:100%;-o-object-fit:contain;object-fit:contain;-o-object-position:center;object-position:center}.landing-kostek .sidebar-conceal{position:absolute;right:auto;bottom:0;left:0;width:13.35%;height:8.7%;border-top:1px solid rgba(120,151,193,.11);background:linear-gradient(180deg,#060e17,#0a111d)}.landing-kostek .features{padding-block:112px 120px}.landing-kostek .feature-grid{display:grid;margin-top:55px;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}.landing-kostek .feature{position:relative;display:block;min-height:280px;padding:29px;border-right:1px solid rgba(137,169,213,.25);border-bottom:1px solid rgba(137,169,213,.25);background:#0d1b2e;overflow:hidden}.landing-kostek .feature:before{position:absolute;inset:0;opacity:.15;content:"";transition:opacity .18s ease}.landing-kostek .feature:hover:before{opacity:.24}.landing-kostek .feature-blue:before{background:linear-gradient(145deg,#2587ff,transparent 62%)}.landing-kostek .feature-purple:before,.landing-kostek .feature-violet:before{background:linear-gradient(145deg,#8d52ff,transparent 62%)}.landing-kostek .feature-green:before{background:linear-gradient(145deg,#1dce98,transparent 62%)}.landing-kostek .feature-orange:before{background:linear-gradient(145deg,#ff8525,transparent 62%)}.landing-kostek .feature-yellow:before{background:linear-gradient(145deg,#ffc23f,transparent 62%)}.landing-kostek .feature>*{position:relative;z-index:2}.landing-kostek .feature-icon{display:grid;width:46px;height:46px;place-items:center;border-radius:7px;background:rgba(45,134,255,.12);color:#4b9cff}.landing-kostek .feature-purple .feature-icon,.landing-kostek .feature-violet .feature-icon{background:rgba(140,85,255,.12);color:#a27cff}.landing-kostek .feature-green .feature-icon{background:rgba(32,214,162,.11);color:#32d6a6}.landing-kostek .feature-orange .feature-icon{background:rgba(255,138,43,.11);color:#ff963e}.landing-kostek .feature-yellow .feature-icon{background:rgba(255,196,71,.11);color:#ffca55}.landing-kostek .feature h3{margin:27px 0 10px;font-size:21px}.landing-kostek .feature p{max-width:310px;margin:0;color:#96a6bb;font-size:14px;line-height:1.6}.landing-kostek .feature-link{position:absolute;right:28px;bottom:25px;left:28px;display:flex;align-items:center;justify-content:space-between;color:#dce7f7;font-size:12px;font-weight:750}.landing-kostek .feature-link svg{width:17px;height:17px}.landing-kostek .rhythm-band{overflow:hidden;border-block:1px solid rgba(118,150,192,.15);background:#07111f}.landing-kostek .rhythm-layout{position:relative;display:grid;min-height:610px;grid-template-columns:.7fr 1fr 1fr;align-items:center;gap:45px}.landing-kostek .rhythm-kostek{align-self:end;width:390px;filter:drop-shadow(0 28px 40px rgba(0,0,0,.35));transform:translateX(-45px)}.landing-kostek .rhythm-copy>p{max-width:460px}.landing-kostek .week{display:grid;max-width:430px;margin-top:30px;grid-template-columns:repeat(7,1fr);gap:7px}.landing-kostek .week span{display:grid;height:62px;place-items:center;align-content:center;gap:6px;border:1px solid var(--line);border-radius:6px;color:#687b94}.landing-kostek .week b{color:#a5b3c6;font-size:11px}.landing-kostek .week svg{width:15px;height:15px}.landing-kostek .week .done{border-color:rgba(32,214,162,.25);background:rgba(32,214,162,.08);color:var(--green)}.landing-kostek .week .today{border-color:rgba(55,144,255,.56);background:rgba(45,134,255,.14);color:#51a1ff}.landing-kostek .rhythm-plan{padding:28px;border:1px solid rgba(83,145,229,.34);border-radius:8px;background:#0b1829;box-shadow:0 32px 70px rgba(0,0,0,.25)}.landing-kostek .plan-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:20px;border-bottom:1px solid var(--line)}.landing-kostek .plan-head span{font-weight:750}.landing-kostek .plan-head strong{color:#65a9ff}.landing-kostek .rhythm-plan ul{display:grid;margin:0;padding:8px 0 18px;list-style:none}.landing-kostek .rhythm-plan li{display:grid;min-height:76px;grid-template-columns:36px 1fr auto;align-items:center;gap:12px;border-bottom:1px solid rgba(122,153,193,.13)}.landing-kostek .rhythm-plan li>svg{display:block;width:20px;color:#4e9fff}.landing-kostek .rhythm-plan li.complete>svg{color:var(--green)}.landing-kostek .rhythm-plan li.locked{opacity:.5}.landing-kostek .rhythm-plan li b,.landing-kostek .rhythm-plan li small,.landing-kostek .rhythm-plan li span{display:block}.landing-kostek .rhythm-plan li b{font-size:13px}.landing-kostek .rhythm-plan li small{margin-top:4px;color:#8495aa;font-size:11px}.landing-kostek .rhythm-plan li em{color:#8092a9;font-size:11px;font-style:normal}.landing-kostek .rhythm-plan .button{width:100%}.landing-kostek .momentum-band{overflow:hidden;border-block:1px solid rgba(98,151,225,.2);background:radial-gradient(circle at 72% 45%,rgba(40,128,255,.15),transparent 34%),linear-gradient(180deg,#07121f,#06101c)}.landing-kostek .momentum-layout{display:grid;min-height:590px;grid-template-columns:.72fr 1.28fr;align-items:center;gap:78px}.landing-kostek .momentum-copy>p{max-width:470px}.landing-kostek .text-link{display:inline-flex;margin-top:18px;align-items:center;gap:10px;color:#5ca8ff;font-size:13px;font-weight:800}.landing-kostek .text-link svg{width:17px;height:17px}.landing-kostek .momentum-board{position:relative;display:grid;min-height:420px;grid-template-columns:220px 1fr;align-items:center;gap:34px;padding:42px;border:1px solid rgba(83,145,229,.38);border-radius:8px;background:rgba(10,24,42,.88);box-shadow:0 35px 80px rgba(0,0,0,.28)}.landing-kostek .level-orbit{position:relative;display:grid;width:205px;height:205px;place-items:center}.landing-kostek .level-orbit svg{position:absolute;inset:0;width:100%;height:100%;rotate:-90deg}.landing-kostek .level-orbit circle{fill:none;stroke:#182a41;stroke-width:11}.landing-kostek .level-orbit .level-progress{stroke:#35a8ff;stroke-dasharray:414;stroke-dashoffset:116;stroke-linecap:round;filter:drop-shadow(0 0 8px rgba(42,151,255,.55))}.landing-kostek .level-orbit>div{position:relative;display:grid;place-items:center}.landing-kostek .level-orbit small,.landing-kostek .level-orbit span{color:#8ca0b9}.landing-kostek .level-orbit small{font-size:12px;text-transform:uppercase}.landing-kostek .level-orbit strong{margin-block:-2px;font-size:74px;line-height:1}.landing-kostek .level-orbit span{font-size:11px}.landing-kostek .momentum-path{align-self:center}.landing-kostek .path-head{display:flex;align-items:center;justify-content:space-between;gap:20px}.landing-kostek .path-head span{font-size:20px;font-weight:800}.landing-kostek .path-head strong{color:#50a5ff;font-size:13px}.landing-kostek .path-track{height:10px;margin-block:19px 13px;border-radius:10px;background:#17283e;overflow:hidden}.landing-kostek .path-track span{display:block;width:38%;height:100%;border-radius:inherit;background:linear-gradient(90deg,#2584ff,#29cfe7)}.landing-kostek .momentum-path p{margin:0;color:#8497af;font-size:12px}.landing-kostek .momentum-metrics{display:grid;grid-column:1/-1;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}.landing-kostek .momentum-metrics>div{display:grid;min-height:92px;padding:20px 14px 0;grid-template-columns:32px 1fr;align-content:start;border-right:1px solid var(--line)}.landing-kostek .momentum-metrics>div:last-child{border-right:0}.landing-kostek .momentum-metrics svg{grid-row:1/3;color:#45a0ff}.landing-kostek .momentum-metrics>div:first-child svg{color:#ff9e36}.landing-kostek .momentum-metrics>div:nth-child(4) svg{color:#ffca49}.landing-kostek .momentum-metrics strong{font-size:20px;line-height:1}.landing-kostek .momentum-metrics span{margin-top:6px;color:#8597ae;font-size:11px}.landing-kostek .faq{display:grid;padding-block:110px;grid-template-columns:.75fr 1.25fr;gap:80px}.landing-kostek .faq-intro{display:grid;min-width:0;align-content:start}.landing-kostek .faq-heading>p{max-width:360px}.landing-kostek .faq-kostek{width:390px;max-height:440px;margin:18px auto -82px;-o-object-fit:contain;object-fit:contain;filter:drop-shadow(0 28px 32px rgba(0,0,0,.35))}.landing-kostek .faq-list{border-top:1px solid var(--line)}.landing-kostek .faq details{border-bottom:1px solid var(--line)}.landing-kostek .faq summary{display:flex;min-height:78px;align-items:center;justify-content:space-between;gap:20px;cursor:pointer;font-size:16px;font-weight:700;list-style:none}.landing-kostek .faq summary::-webkit-details-marker{display:none}.landing-kostek .faq summary svg{flex:0 0 auto;color:#6d8caf;transition:transform .16s ease}.landing-kostek .faq details[open] summary svg{transform:rotate(45deg);color:#4b9dff}.landing-kostek .faq details p{max-width:700px;margin:-4px 0 24px;color:#96a6ba;font-size:14px;line-height:1.7}.landing-kostek .final-cta{overflow:hidden;border-block:1px solid rgba(99,190,255,.56);background:radial-gradient(circle at 82% 28%,rgba(71,229,232,.45),transparent 30%),radial-gradient(circle at 30% 110%,rgba(142,46,244,.55),transparent 43%),linear-gradient(108deg,#087be8,#334deb 45%,#8d31dc)}.landing-kostek .cta-shell{position:relative;display:flex;min-height:440px;align-items:center}.landing-kostek .cta-copy{position:relative;z-index:4;max-width:620px;padding-block:62px}.landing-kostek .cta-copy .kicker{color:#c8e1ff}.landing-kostek .cta-copy>p{max-width:540px;color:rgba(255,255,255,.78)}.landing-kostek .cta-copy .button{margin-top:18px}.landing-kostek .cta-shell>img{position:absolute;filter:drop-shadow(0 24px 30px rgba(0,0,0,.22))}.landing-kostek .cta-kostek{z-index:2;right:200px;bottom:-86px;width:340px;transform:rotate(-2deg)}.landing-kostek .cta-professor{z-index:3;right:6px;bottom:-142px;width:380px}.landing-kostek .site-footer{padding-block:58px 28px;background:#040912}.landing-kostek .footer-grid{display:grid;grid-template-columns:1.7fr repeat(3,1fr);gap:50px}.landing-kostek .footer-brand img{width:175px;height:58px;-o-object-fit:contain;object-fit:contain;-o-object-position:left center;object-position:left center}.landing-kostek .footer-brand p{max-width:290px;color:#7f90a6;font-size:12px;line-height:1.6}.landing-kostek .footer-grid>div:not(.footer-brand){display:grid;align-content:start;gap:11px}.landing-kostek .footer-grid strong{margin-bottom:6px;font-size:13px}.landing-kostek .footer-grid a{color:#8091a7;font-size:12px}.landing-kostek .footer-grid a:hover{color:white}.landing-kostek .footer-bottom{display:flex;margin-top:42px;padding-top:22px;border-top:1px solid rgba(127,154,190,.14);justify-content:space-between;color:#64758a;font-size:11px}@keyframes hero-float{0%,to{transform:translateY(0) rotate(0)}50%{transform:translateY(-9px) rotate(.5deg)}}@media (max-width:1040px){.landing-kostek .nav-shell{grid-template-columns:190px 1fr auto}.landing-kostek .main-nav{gap:18px}.landing-kostek .main-nav a:first-child{display:none}.landing-kostek .hero-shell{grid-template-columns:1fr 1fr}.landing-kostek .hero h1{font-size:60px}.landing-kostek .faq-heading h2,.landing-kostek .momentum-copy h2,.landing-kostek .product-copy h2,.landing-kostek .section-heading h2{font-size:50px}.landing-kostek .hero-stage{min-height:570px}.landing-kostek .hero-kostek{right:29%;width:390px}.landing-kostek .hero-professor{right:-10%;width:520px}.landing-kostek .orbit-chip{padding-inline:11px}.landing-kostek .orbit-chip span{font-size:11px}.landing-kostek .orbit-battle,.landing-kostek .orbit-dictionary,.landing-kostek .orbit-flashcards{left:0}.landing-kostek .orbit-questions,.landing-kostek .orbit-streak{right:-2%}.landing-kostek .intro-lead{grid-template-columns:.58fr 1fr;gap:30px}.landing-kostek .intro-student-stage img{width:340px}.landing-kostek .product-gallery .product-copy{gap:20px 36px}.landing-kostek .screenshot-stage{width:calc(100% - 112px)}.landing-kostek .gallery-professor{right:-20px;bottom:-25px;width:400px}.landing-kostek .momentum-layout{gap:42px}.landing-kostek .momentum-board{grid-template-columns:170px 1fr;padding:32px}.landing-kostek .level-orbit{width:165px;height:165px}.landing-kostek .level-orbit strong{font-size:60px}.landing-kostek .faq-kostek{width:330px}.landing-kostek .preview-body{min-height:420px}.landing-kostek .rhythm-layout{grid-template-columns:.65fr 1fr}.landing-kostek .rhythm-kostek{width:310px}.landing-kostek .rhythm-plan{grid-column:1/-1;width:min(650px,100%);margin:0 auto 70px}}@media (max-width:780px){.landing-kostek .nav-shell,.landing-kostek .section-shell{width:min(100% - 28px,var(--shell))}.landing-kostek .site-header{height:66px}.landing-kostek .nav-shell{grid-template-columns:1fr auto auto;gap:10px}.landing-kostek .brand{width:164px}.landing-kostek .brand img{width:174px}.landing-kostek .menu-toggle{display:grid}.landing-kostek .main-nav{position:absolute;top:66px;right:14px;left:14px;display:none;padding:10px;border:1px solid var(--line);border-radius:8px;background:rgba(8,17,30,.98);box-shadow:0 24px 50px rgba(0,0,0,.34)}.landing-kostek .main-nav.open{display:grid}.landing-kostek .main-nav a,.landing-kostek .main-nav a:first-child{display:block;padding:12px}.landing-kostek .nav-actions .button-quiet{display:none}.landing-kostek .nav-actions .button-primary{min-height:40px;padding-inline:13px;font-size:12px}.landing-kostek .hero{min-height:auto}.landing-kostek .hero-shell{min-height:auto;grid-template-columns:1fr;align-items:start;padding-block:58px 42px}.landing-kostek .hero-copy{z-index:8}.landing-kostek .hero h1{max-width:560px;font-size:clamp(42px,11vw,62px)}.landing-kostek .hero-copy>p{max-width:520px;font-size:15px}.landing-kostek .hero-stage{position:relative;right:auto;bottom:auto;width:100%;min-height:680px;opacity:1}.landing-kostek .hero-kostek{right:auto;bottom:145px;left:8%;width:340px;translate:none}.landing-kostek .hero-professor{right:3%;bottom:145px;width:430px}.landing-kostek .stage-ring{display:none}.landing-kostek .feature-orbit{display:grid;inset:auto 0 0;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.landing-kostek .orbit-chip{position:static;min-width:0;padding-inline:10px}.landing-kostek .orbit-chip span{overflow:hidden;font-size:10px;text-overflow:ellipsis}.landing-kostek .features,.landing-kostek .intro{padding-block:80px}.landing-kostek .intro-lead{min-height:auto;grid-template-columns:1fr;gap:18px}.landing-kostek .intro-student-stage{min-height:360px}.landing-kostek .intro-student-stage img{width:320px}.landing-kostek .journey{grid-template-columns:1fr}.landing-kostek .journey-step{min-height:220px}.landing-kostek .product-band{padding-block:80px}.landing-kostek .product-gallery{gap:28px}.landing-kostek .product-gallery .product-copy{grid-template-columns:1fr}.landing-kostek .product-gallery .product-copy>p{justify-self:start}.landing-kostek .product-gallery .product-copy .kicker,.landing-kostek .screenshot-tabs{grid-column:auto}.landing-kostek .screenshot-stage{aspect-ratio:2.025/1}.landing-kostek .product-copy{max-width:600px}.landing-kostek .feature-grid{grid-template-columns:repeat(2,1fr)}.landing-kostek .momentum-layout{grid-template-columns:1fr;gap:36px;padding-block:76px}.landing-kostek .momentum-board{min-height:390px}.landing-kostek .rhythm-layout{grid-template-columns:.75fr 1.25fr;min-height:550px}.landing-kostek .rhythm-kostek{width:270px;transform:translateX(-28px)}.landing-kostek .rhythm-plan{margin-bottom:55px}.landing-kostek .faq{grid-template-columns:1fr;gap:35px;padding-block:80px}.landing-kostek .faq-intro{grid-template-columns:1fr .7fr;align-items:end}.landing-kostek .faq-kostek{width:260px;max-height:320px;margin:0 0 -34px}.landing-kostek .cta-shell{min-height:410px}.landing-kostek .cta-kostek{right:150px;bottom:-55px;width:280px;opacity:.56}.landing-kostek .cta-professor{right:-12px;bottom:0;width:258px;opacity:.9}.landing-kostek .footer-grid{grid-template-columns:1.4fr 1fr 1fr}.landing-kostek .footer-grid>div:last-child{display:none}}@media (max-width:540px){.landing-kostek .nav-actions{display:none}.landing-kostek .nav-shell{grid-template-columns:1fr auto}.landing-kostek .hero{min-height:auto}.landing-kostek .hero-shell{min-height:auto;padding-top:46px}.landing-kostek .hero h1{font-size:40px}.landing-kostek .hero-copy>p{line-height:1.58}.landing-kostek .hero-actions{flex-direction:column;max-width:310px}.landing-kostek .store-badges{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.landing-kostek .store-badge{min-width:0;padding-inline:10px}.landing-kostek .store-badge strong{font-size:12px}.landing-kostek .hero-stage{min-height:650px}.landing-kostek .hero-kostek{bottom:165px;left:1%;width:270px}.landing-kostek .hero-professor{right:-4%;bottom:165px;width:350px}.landing-kostek .orbit-chip span{white-space:normal}.landing-kostek .faq-heading h2,.landing-kostek .momentum-copy h2,.landing-kostek .product-copy h2,.landing-kostek .section-heading h2{font-size:36px}.landing-kostek .intro-student-stage{min-height:330px}.landing-kostek .intro-student-stage img{width:285px}.landing-kostek .screenshot-tabs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr))}.landing-kostek .screenshot-tab{justify-content:center;padding:0}.landing-kostek .screenshot-tab span{display:none}.landing-kostek .screenshot-stage{aspect-ratio:2.025/1}.landing-kostek .product-shot img{-o-object-position:center;object-position:center}.landing-kostek .sidebar-conceal{width:13.35%;height:8.7%}.landing-kostek .feature-grid{grid-template-columns:1fr}.landing-kostek .feature{min-height:245px}.landing-kostek .momentum-board{grid-template-columns:1fr;padding:26px 20px}.landing-kostek .level-orbit{width:170px;height:170px;margin-inline:auto}.landing-kostek .momentum-metrics{grid-template-columns:repeat(2,1fr)}.landing-kostek .momentum-metrics>div:nth-child(2){border-right:0}.landing-kostek .momentum-metrics>div{border-bottom:1px solid var(--line)}.landing-kostek .momentum-metrics>div:nth-child(n+3){border-bottom:0}.landing-kostek .faq-intro{grid-template-columns:1fr}.landing-kostek .faq-kostek{width:270px;margin:6px auto -32px}.landing-kostek .rhythm-layout{display:block;padding-top:75px}.landing-kostek .rhythm-kostek{position:absolute;right:-115px;bottom:0;z-index:1;width:270px;opacity:.35;transform:none}.landing-kostek .rhythm-copy,.landing-kostek .rhythm-plan{position:relative;z-index:2}.landing-kostek .rhythm-plan{margin:45px 0 70px}.landing-kostek .week{max-width:100%}.landing-kostek .cta-kostek{right:94px;bottom:-26px;width:235px;opacity:.38}.landing-kostek .cta-professor{right:-28px;bottom:0;width:224px;opacity:.72}.landing-kostek .cta-copy{max-width:320px}.landing-kostek .footer-grid{grid-template-columns:1fr 1fr}.landing-kostek .footer-brand{grid-column:1/-1}.landing-kostek .footer-grid>div:nth-child(4){display:none}.landing-kostek .footer-bottom{align-items:flex-start;flex-direction:column;gap:7px}}@media (max-width:780px){.landing-kostek .nav-shell,.landing-kostek .section-shell{width:calc(100% - 32px)}.landing-kostek .site-header{height:64px;background:rgba(5,11,21,.96)}.landing-kostek .nav-shell{grid-template-columns:1fr auto auto}.landing-kostek .brand{width:154px;height:42px}.landing-kostek .brand img{width:164px;height:50px}.landing-kostek .menu-toggle{width:42px;height:42px}.landing-kostek .main-nav{top:64px;right:16px;left:16px}.landing-kostek .hero-shell{padding-block:40px 30px}.landing-kostek .hero h1{max-width:520px;font-size:48px;line-height:.99}.landing-kostek .hero-copy>p{max-width:560px;margin-top:22px;font-size:15px;line-height:1.65}.landing-kostek .hero-actions{margin-top:25px}.landing-kostek .hero-actions .button{min-height:50px}.landing-kostek .store-availability{margin-top:22px}.landing-kostek .store-badge{min-height:50px}.landing-kostek .hero-stage{min-height:555px;margin-top:12px}.landing-kostek .hero-kostek{bottom:80px;left:5%;width:315px}.landing-kostek .hero-professor{right:1%;bottom:80px;width:395px}.landing-kostek .feature-orbit{display:flex;inset:auto 0 0;gap:8px;padding-bottom:4px;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none;pointer-events:auto}.landing-kostek .feature-orbit::-webkit-scrollbar{display:none}.landing-kostek .orbit-chip{position:static;min-height:46px;flex:0 0 auto;padding:9px 13px;scroll-snap-align:start;background:rgba(10,24,42,.94)}.landing-kostek .orbit-chip svg{width:18px;height:18px}.landing-kostek .orbit-chip span{overflow:visible;font-size:11px;white-space:nowrap}.landing-kostek .features,.landing-kostek .intro{padding-block:72px}.landing-kostek .intro-lead{display:grid;gap:18px}.landing-kostek .intro-lead .section-heading{order:1}.landing-kostek .intro-student-stage{order:2;min-height:315px}.landing-kostek .intro-student-stage img{width:295px}.landing-kostek .faq-heading h2,.landing-kostek .momentum-copy h2,.landing-kostek .product-copy h2,.landing-kostek .section-heading h2{font-size:38px;line-height:1.06}.landing-kostek .cta-copy>p,.landing-kostek .faq-heading>p:last-child,.landing-kostek .momentum-copy>p,.landing-kostek .product-copy>p,.landing-kostek .section-heading>p:last-child{font-size:14px}.landing-kostek .journey{display:flex;margin-right:-16px;margin-left:-16px;padding-inline:16px;gap:10px;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none}.landing-kostek .journey::-webkit-scrollbar{display:none}.landing-kostek .journey-step{min-height:205px;flex:0 0 285px;padding:26px;scroll-snap-align:start}.landing-kostek .step-copy>svg{margin-bottom:24px}.landing-kostek .product-band{padding-block:72px}.landing-kostek .product-gallery{gap:24px}.landing-kostek .screenshot-tabs{display:flex;margin-right:-16px;padding-right:16px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}.landing-kostek .screenshot-tabs::-webkit-scrollbar{display:none}.landing-kostek .screenshot-tab{min-height:44px;flex:0 0 auto;padding-inline:14px}.landing-kostek .screenshot-tab span{display:inline;font-size:11px}.landing-kostek .screenshot-stage{width:calc(100% - 66px);aspect-ratio:1.72/1;background:#07111e}.landing-kostek .product-shot img{-o-object-fit:contain;object-fit:contain;-o-object-position:center;object-position:center}.landing-kostek .gallery-professor{right:-18px;bottom:-22px;width:300px}.landing-kostek .section-heading.centered{text-align:left}.landing-kostek .feature-grid{display:flex;margin:38px -16px 0;padding-inline:16px;gap:10px;border:0;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none}.landing-kostek .feature-grid::-webkit-scrollbar{display:none}.landing-kostek .feature{min-height:242px;flex:0 0 300px;padding:25px;border:1px solid rgba(137,169,213,.25);border-radius:8px;scroll-snap-align:start}.landing-kostek .feature h3{margin-top:22px}.landing-kostek .momentum-layout{padding-block:72px}.landing-kostek .momentum-board{min-height:350px;grid-template-columns:145px 1fr;gap:22px;padding:26px 22px}.landing-kostek .level-orbit{width:140px;height:140px}.landing-kostek .level-orbit strong{font-size:48px}.landing-kostek .path-head{align-items:flex-start;flex-direction:column;gap:7px}.landing-kostek .path-head span{font-size:17px}.landing-kostek .momentum-metrics{grid-template-columns:repeat(2,1fr)}.landing-kostek .momentum-metrics>div{min-height:82px;border-bottom:1px solid var(--line)}.landing-kostek .momentum-metrics>div:nth-child(2){border-right:0}.landing-kostek .momentum-metrics>div:nth-child(n+3){border-bottom:0}.landing-kostek .faq{gap:18px;padding-block:72px}.landing-kostek .faq-intro{grid-template-columns:1fr .72fr;align-items:end}.landing-kostek .faq-kostek{width:235px;max-height:285px;margin:0 -20px -28px auto}.landing-kostek .faq summary{min-height:70px;font-size:14px}.landing-kostek .cta-shell{min-height:590px;align-items:flex-start}.landing-kostek .cta-copy{max-width:100%;padding:48px 0 300px}.landing-kostek .cta-copy>p{max-width:440px}.landing-kostek .cta-kostek{right:auto;bottom:-45px;left:-30px;width:275px;opacity:.94}.landing-kostek .cta-professor{right:-8px;bottom:0;width:255px;opacity:1}.landing-kostek .site-footer{padding-top:46px}.landing-kostek .footer-grid{grid-template-columns:1fr 1fr;gap:34px 18px}.landing-kostek .footer-brand{grid-column:1/-1}.landing-kostek .footer-grid>div:last-child{display:grid}}@media (max-width:540px){.landing-kostek .nav-shell{grid-template-columns:1fr auto}.landing-kostek .nav-actions{display:none}.landing-kostek .hero-shell{padding-top:34px}.landing-kostek .hero h1{font-size:42px}.landing-kostek .hero-actions{max-width:none}.landing-kostek .hero-actions .button{width:100%}.landing-kostek .store-badges{grid-template-columns:repeat(2,minmax(0,1fr))}.landing-kostek .store-badge{padding-inline:9px}.landing-kostek .hero-stage{min-height:505px}.landing-kostek .hero-kostek{bottom:64px;left:-2%;width:245px}.landing-kostek .hero-professor{right:-8%;bottom:64px;width:320px}.landing-kostek .faq-heading h2,.landing-kostek .momentum-copy h2,.landing-kostek .product-copy h2,.landing-kostek .section-heading h2{font-size:34px}.landing-kostek .intro-student-stage{min-height:275px}.landing-kostek .intro-student-stage img{width:255px}.landing-kostek .journey-step{flex-basis:82vw}.landing-kostek .screenshot-stage{width:calc(100% - 34px);aspect-ratio:1.48/1}.landing-kostek .gallery-professor{right:-24px;bottom:-18px;width:240px}.landing-kostek .feature{flex-basis:84vw}.landing-kostek .momentum-board{grid-template-columns:112px 1fr;gap:14px;padding:22px 16px}.landing-kostek .level-orbit{width:110px;height:110px}.landing-kostek .level-orbit strong{font-size:39px}.landing-kostek .level-orbit span{font-size:9px}.landing-kostek .momentum-metrics{grid-column:1/-1}.landing-kostek .momentum-metrics>div{grid-template-columns:28px 1fr;padding-inline:10px}.landing-kostek .momentum-metrics strong{font-size:17px}.landing-kostek .faq-intro{grid-template-columns:1fr}.landing-kostek .faq-kostek{width:240px;margin:4px auto -26px}.landing-kostek .cta-shell{min-height:610px}.landing-kostek .cta-copy{padding-bottom:310px}.landing-kostek .cta-copy .button{width:100%}.landing-kostek .cta-kostek{bottom:-26px;left:-58px;width:235px;opacity:.9}.landing-kostek .cta-professor{right:-26px;bottom:0;width:220px;opacity:1}.landing-kostek .footer-grid{grid-template-columns:1fr 1fr}.landing-kostek .footer-grid>div:nth-child(4){display:grid}}@media (prefers-reduced-motion:reduce){.landing-kostek{scroll-behavior:auto}.landing-kostek *,.landing-kostek :after,.landing-kostek :before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.landing-kostek{min-height:100vh;position:relative}.landing-kostek .hero-kostek{right:21%}.landing-kostek .orbit-battle{top:63%;left:-6%}.landing-kostek .orbit-battle svg{color:#2f88ff}.landing-kostek .orbit-questions{right:-15%}.landing-kostek .hero h1 span{font-weight:900}