@import "https://fonts.googleapis.com/css2?family=Poppins:wght@500;600;700;800&family=Inter:wght@400;450;500;600;700&display=swap";
:root{--blue-700:#0a4cd8;--blue-600:#0b5cff;--blue-500:#2c6bff;--blue-300:#8fb4ff;--blue-100:#dce8ff;--blue-50:#eaf1ff;--blue-25:#f3f7ff;--navy-900:#0b1b3a;--ink-900:#0f1b34;--ink-800:#182a4a;--ink-600:#4c5b76;--ink-500:#5b6b85;--ink-400:#8593a9;--ink-300:#a9b4c6;--bg:#f6f8fc;--bg-alt:#f0f4fa;--card:#fff;--line:#e7edf6;--line-2:#edf1f8;--green-600:#17a05a;--green-50:#e8f8f0;--green-100:#d5f1e2;--red-600:#e23b2e;--red-50:#fdecea;--amber-600:#e29009;--amber-50:#fef4e2;--purple-600:#7c4dff;--purple-50:#f0ebff;--maple:#e23b2e;--star:#f6a609;--r-sm:8px;--r:12px;--r-lg:16px;--r-xl:20px;--pill:999px;--sh-1:0 1px 2px #101e360a,0 2px 6px #101e360d;--sh-2:0 2px 8px #101e360f,0 12px 28px #101e360f;--sh-pop:0 12px 40px #0b5cff2e;--maxw:1200px;--nav-h:72px}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{color:var(--ink-500);background:var(--bg);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:15px;line-height:1.6}img{max-width:100%;display:block}svg{flex:none;width:18px;height:18px}.link svg{width:16px;height:16px}a{color:inherit;text-decoration:none}button{cursor:pointer;background:0 0;border:0;font-family:inherit}h1,h2,h3,h4,h5{color:var(--ink-900);letter-spacing:-.01em;margin:0;font-family:Poppins,sans-serif;font-weight:700;line-height:1.18}p{margin:0}ul{margin:0;padding:0;list-style:none}small{font-size:12.5px}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}.wrap-wide{max-width:1280px;margin:0 auto;padding:0 24px}.section{padding:34px 0}.row{display:flex}.col{flex-direction:column;display:flex}.between{justify-content:space-between;align-items:center;display:flex}.center{align-items:center;display:flex}.gap-4{gap:4px}.gap-6{gap:6px}.gap-8{gap:8px}.gap-10{gap:10px}.gap-12{gap:12px}.gap-14{gap:14px}.gap-16{gap:16px}.gap-20{gap:20px}.gap-24{gap:24px}.gap-28{gap:28px}.mt-4{margin-top:4px}.mt-8{margin-top:8px}.mt-12{margin-top:12px}.mt-16{margin-top:16px}.mt-20{margin-top:20px}.mt-24{margin-top:24px}.mt-32{margin-top:32px}.wide{width:100%}.grow{flex:1}.wrap-flex{flex-wrap:wrap}.h1{letter-spacing:-.02em;font-size:52px;font-weight:800;line-height:1.06}.h2{letter-spacing:-.02em;font-size:34px;font-weight:800}.h3{font-size:22px;font-weight:700}.h4{font-size:17px;font-weight:700}.eyebrow{letter-spacing:.14em;text-transform:uppercase;color:var(--blue-600);font-family:Inter;font-size:12px;font-weight:700}.lead{color:var(--ink-500);font-size:16px;line-height:1.6}.muted{color:var(--ink-400)}.mut2{color:var(--ink-500)}.blue{color:var(--blue-600)}.navy{color:var(--ink-900)}.green{color:var(--green-600)}.red{color:var(--red-600)}.b6{font-weight:600}.b7{font-weight:700}.b8{font-weight:800}.t12{font-size:12px}.t13{font-size:13px}.t14{font-size:14px}.t15{font-size:15px}.t16{font-size:16px}.link{color:var(--blue-600);align-items:center;gap:6px;font-weight:600;display:inline-flex}.link:hover{color:var(--blue-700)}.center-t{text-align:center}.btn{border-radius:var(--r-sm);white-space:nowrap;justify-content:center;align-items:center;gap:8px;padding:11px 20px;font-family:Inter;font-size:14.5px;font-weight:600;line-height:1;transition:all .15s;display:inline-flex}.btn svg{width:17px;height:17px}.btn-primary{background:var(--blue-600);color:#fff;box-shadow:0 6px 16px #0b5cff38}.btn-primary:hover{background:var(--blue-700)}.btn-ghost{color:var(--ink-800);border:1.5px solid var(--line);background:#fff}.btn-ghost:hover{border-color:var(--blue-300);color:var(--blue-600)}.btn-soft{background:var(--blue-50);color:var(--blue-600)}.btn-soft:hover{background:var(--blue-100)}.btn-lg{padding:14px 26px;font-size:15.5px}.btn-sm{padding:8px 14px;font-size:13px}.btn-block{width:100%}.btn-outline{color:var(--blue-600);border:1.5px solid var(--blue-100);background:#fff}.btn-outline:hover{border-color:var(--blue-600)}.chip{border-radius:var(--pill);border:1px solid var(--line);color:var(--ink-600);white-space:nowrap;background:#fff;align-items:center;gap:7px;padding:8px 15px;font-size:13.5px;font-weight:500;transition:all .15s;display:inline-flex}.chip:hover{border-color:var(--blue-300);color:var(--blue-600)}.chip.active,.chip-blue{background:var(--blue-600);color:#fff;border-color:var(--blue-600)}.chip-soft{background:var(--blue-50);color:var(--blue-600);border-color:#0000}.tag{background:var(--blue-50);color:var(--blue-600);border-radius:8px;align-items:center;padding:5px 11px;font-size:12.5px;font-weight:600;display:inline-flex}.tag-grey{color:var(--ink-500);background:#f0f3f9}.badge{border-radius:var(--pill);align-items:center;gap:5px;padding:3px 10px;font-size:12px;font-weight:600;line-height:1.6;display:inline-flex}.badge-blue{background:var(--blue-50);color:var(--blue-600)}.badge-green{background:var(--green-50);color:var(--green-600)}.badge-amber{background:var(--amber-50);color:var(--amber-600)}.badge-purple{background:var(--purple-50);color:var(--purple-600)}.badge-grey{color:var(--ink-500);background:#eef2f8}.diff-easy{background:var(--green-50);color:var(--green-600)}.diff-medium{background:var(--amber-50);color:var(--amber-600)}.diff-hard{background:var(--red-50);color:var(--red-600)}.verified{width:16px;height:16px;color:var(--blue-600);display:inline-flex}.verified svg{width:16px;height:16px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-1)}.card-pad{padding:22px}.card-hover{transition:all .18s}.card-hover:hover{box-shadow:var(--sh-2);border-color:var(--blue-100);transform:translateY(-2px)}.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-1);padding:20px}.divider{background:var(--line);border:0;height:1px;margin:0}.input{border:1px solid var(--line);border-radius:var(--r-sm);width:100%;color:var(--ink-800);background:#fff;padding:12px 14px;font-family:Inter;font-size:14.5px}.input:focus{border-color:var(--blue-500);box-shadow:0 0 0 3px var(--blue-50);outline:none}.input::placeholder{color:var(--ink-300)}textarea.input{resize:vertical;line-height:1.55}.search{border:1px solid var(--line);border-radius:var(--pill);color:var(--ink-400);background:#f1f5fb;align-items:center;gap:10px;padding:9px 16px;display:flex}.search input{width:100%;color:var(--ink-800);background:0 0;border:0;outline:none;font-family:Inter;font-size:13.5px}.av{object-fit:cover;background:#dde6f2;border-radius:50%;flex:none}.av-20{width:20px;height:20px}.av-24{width:24px;height:24px}.av-28{width:28px;height:28px}.av-32{width:32px;height:32px}.av-36{width:36px;height:36px}.av-40{width:40px;height:40px}.av-44{width:44px;height:44px}.av-48{width:48px;height:48px}.av-56{width:56px;height:56px}.av-64{width:64px;height:64px}.av-80{width:80px;height:80px}.av-96{width:96px;height:96px}.av-ring{box-shadow:0 0 0 3px #fff,0 0 0 4px var(--blue-100)}.av-stack{display:flex}.av-stack .av{border:2px solid #fff;margin-left:-10px}.av-stack .av:first-child{margin-left:0}.tile{border-radius:14px;flex:none;place-items:center;width:52px;height:52px;display:grid}.tile-round{border-radius:50%}.tile svg{width:26px;height:26px}.tile-blue{background:var(--blue-50);color:var(--blue-600)}.tile-green{background:var(--green-50);color:var(--green-600)}.tile-red{background:var(--red-50);color:var(--maple)}.tile-amber{background:var(--amber-50);color:var(--amber-600)}.tile-purple{background:var(--purple-50);color:var(--purple-600)}.tile-navy{color:var(--ink-900);background:#eaf0fa}.stars{color:var(--star);gap:2px;display:inline-flex}.stars svg{width:15px;height:15px}.qk-header{z-index:50;-webkit-backdrop-filter:saturate(180%)blur(10px);backdrop-filter:saturate(180%)blur(10px);border-bottom:1px solid var(--line);background:#ffffffeb;position:sticky;top:0}.qk-header.on-navy{background:var(--navy-900);border-bottom-color:#ffffff14}.qk-nav{height:var(--nav-h);align-items:center;gap:16px;max-width:1360px;margin:0 auto;padding:0 24px;display:flex}.qk-logo{flex-direction:column;flex:none;gap:1px;display:flex}.qk-logo .word{color:var(--ink-900);letter-spacing:-.02em;align-items:center;gap:7px;font-family:Poppins;font-size:24px;font-weight:800;display:flex}.on-navy .qk-logo .word{color:#fff}.qk-logo .tag{color:var(--ink-400);letter-spacing:.005em;white-space:nowrap;margin-left:1px;font-size:9px;font-weight:500}.on-navy .qk-logo .tag{color:#9fb0cc}.qk-logo .qmark{flex:none;width:28px;height:28px}.qk-links{align-items:center;gap:2px;margin:0 auto;display:flex}.qk-links a{color:var(--ink-600);white-space:nowrap;border-radius:9px;align-items:center;gap:6px;padding:8px 11px;font-size:13.5px;font-weight:500;display:flex;position:relative}.qk-links a svg{opacity:.75;width:16px;height:16px}.qk-links a:hover{color:var(--blue-600);background:var(--blue-25)}.qk-links a.active{color:var(--blue-600);font-weight:600}.qk-links a.active:after{content:"";background:var(--blue-600);border-radius:2px;height:2.5px;position:absolute;bottom:-16px;left:13px;right:13px}.on-navy .qk-links a{color:#c7d3e8}.on-navy .qk-links a:hover{color:#fff;background:#ffffff14}.on-navy .qk-links a.active{color:#fff}.qk-actions{flex:none;align-items:center;gap:12px;display:flex}.qk-actions .qk-login,.qk-actions .btn{white-space:nowrap}.qk-search-ic{width:38px;height:38px;color:var(--ink-500);border:1px solid var(--line);border-radius:10px;place-items:center;display:grid}.on-navy .qk-search-ic{color:#c7d3e8;border-color:#ffffff24}.qk-searchbar{border:1px solid var(--line);border-radius:var(--pill);width:238px;color:var(--ink-400);background:#f1f5fb;flex:none;align-items:center;gap:9px;padding:9px 15px;font-size:12.5px;display:flex}.qk-searchbar span{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.qk-searchbar svg{width:16px;height:16px;margin-left:auto}.qk-login{color:var(--ink-700,#33425f);font-size:14px;font-weight:600}.on-navy .qk-login{color:#fff}.qk-login-ghost{border:1px solid var(--line);color:var(--ink-800);border-radius:9px;padding:9px 18px;font-size:14px;font-weight:600}.on-navy .qk-login-ghost{color:#fff;border-color:#fff3}.qk-stats{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:linear-gradient(#f7faff,#f1f6fd)}.qk-stats.plain{background:#fff}.qk-stats-inner{flex-wrap:wrap;justify-content:space-between;gap:16px;max-width:1200px;margin:0 auto;padding:22px 24px;display:flex}.qk-stat{align-items:center;gap:12px;display:flex}.qk-stat svg{width:26px;height:26px;color:var(--blue-600);flex:none}.qk-stat .n{color:var(--blue-600);font-family:Poppins;font-size:21px;font-weight:800;line-height:1}.qk-stat .l{color:var(--ink-500);margin-top:3px;font-size:12.5px}.qk-footer{background:var(--navy-900);color:#c3cee0;padding:56px 0 0}.qk-footer .cols{grid-template-columns:1.6fr 1fr 1fr 1fr 1fr 1.4fr;gap:30px;max-width:1200px;margin:0 auto;padding:0 24px;display:grid}.qk-footer h5{color:#fff;letter-spacing:.01em;margin-bottom:16px;font-family:Poppins;font-size:14px;font-weight:600}.qk-footer .brand .word{color:#fff;align-items:center;gap:7px;font-family:Poppins;font-size:23px;font-weight:800;display:flex}.qk-footer .brand .word .qmark{width:28px;height:28px}.qk-footer .brand .word .qmark circle[stroke],.qk-footer .brand .word .qmark path[stroke]{stroke:#fff}.qk-footer .brand p{color:#93a3c0;max-width:250px;margin-top:14px;font-size:13px;line-height:1.65}.qk-footer a{color:#a9b7d1;padding:5px 0;font-size:13.5px;display:block}.qk-footer a:hover{color:#fff}.qk-footer .social{gap:10px;margin-top:18px;display:flex}.qk-footer .social a{background:#ffffff14;border-radius:50%;place-items:center;width:36px;height:36px;padding:0;display:grid}.qk-footer .social a svg{width:16px;height:16px}.qk-footer .news input{color:#fff;background:#ffffff0f;border:1px solid #ffffff24;border-radius:8px;width:100%;margin-bottom:10px;padding:11px 13px;font-size:13px}.qk-footer .news input::placeholder{color:#8497b6}.qk-footer .news .btn{width:100%}.qk-footbar{border-top:1px solid #ffffff14;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;max-width:1200px;margin:36px auto 0;padding:20px 24px;display:flex}.qk-footbar,.qk-footbar a{color:#8497b6;font-size:12.5px}.qk-footbar .legal{gap:22px;display:flex}.qk-footbar .legal a:hover{color:#fff}.app-shell{grid-template-columns:230px minmax(0,1fr) 320px;align-items:start;gap:22px;max-width:1320px;margin:0 auto;padding:22px 24px;display:grid}.app-left{position:sticky;top:88px}.app-right{flex-direction:column;gap:18px;display:flex;position:sticky;top:88px}.side-nav a{color:var(--ink-600);border-radius:10px;align-items:center;gap:11px;padding:10px 13px;font-size:14px;font-weight:500;display:flex}.side-nav a svg{opacity:.8;width:18px;height:18px}.side-nav a.active{background:var(--blue-50);color:var(--blue-600);font-weight:600}.side-nav a:hover:not(.active){background:#f2f5fb}.feed-tabs{border-bottom:1px solid var(--line);gap:26px;padding:0 4px;display:flex}.feed-tabs a{color:var(--ink-400);border-bottom:2.5px solid #0000;align-items:center;gap:7px;margin-bottom:-1px;padding:14px 2px;font-size:14.5px;font-weight:600;display:flex}.feed-tabs a.active{color:var(--blue-600);border-color:var(--blue-600)}.pbar{background:#e9eef6;border-radius:99px;height:8px;overflow:hidden}.pbar>span{background:var(--blue-600);border-radius:99px;height:100%;display:block}.breadcrumb{color:var(--ink-400);flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;display:flex}.breadcrumb a{color:var(--blue-600)}.breadcrumb .sep{color:var(--ink-300)}.dot{background:var(--ink-300);border-radius:50%;width:3px;height:3px;display:inline-block}.pagi{justify-content:center;align-items:center;gap:6px;display:flex}.pagi a{border:1px solid var(--line);min-width:38px;height:38px;color:var(--ink-600);background:#fff;border-radius:9px;place-items:center;padding:0 6px;font-size:14px;font-weight:600;display:grid}.pagi a.active{background:var(--blue-600);color:#fff;border-color:var(--blue-600)}@media (max-width:1100px){.app-shell{grid-template-columns:1fr}.app-left,.app-right{display:none;position:static}.qk-links{display:none}.qk-footer .cols{grid-template-columns:1fr 1fr}}
main.home{max-width:1340px}.home .hero{padding:44px 0 30px}.hero-grid{grid-template-columns:1fr 1.02fr;align-items:center;gap:44px;display:grid}.hero-grid h1{letter-spacing:-.025em;font-size:54px;font-weight:800;line-height:1.04}.hero-grid .sub{color:var(--ink-500);max-width:440px;margin-top:20px;font-size:16.5px}.hero-grid .cta{flex-wrap:wrap;gap:14px;margin-top:26px;display:flex}.hero-grid .who{color:var(--ink-500);align-items:center;gap:14px;margin-top:26px;font-size:14.5px;display:flex}.tests-card{border:1px solid var(--line);box-shadow:var(--sh-2);background:#fff;border-radius:20px;padding:24px}.tests-grid{grid-template-columns:repeat(5,1fr);gap:12px;margin-top:18px;display:grid}.test-tile{border:1px solid var(--line);text-align:center;border-radius:14px;padding:16px 12px;transition:all .16s;display:block}.test-tile:hover{border-color:var(--blue-100);box-shadow:var(--sh-1)}.test-tile .tile{margin:0 auto 12px}.test-tile .tt{color:var(--ink-900);font-family:Poppins;font-size:13.5px;font-weight:600;line-height:1.25}.test-tile .tp{color:var(--ink-400);margin-top:6px;font-size:12px}.test-tile .tk{color:var(--blue-600);margin-top:2px;font-size:11.5px;font-weight:600}.topic-bar{flex-wrap:wrap;align-items:center;gap:0;display:flex;overflow:hidden}.topic-item{border-right:1px solid var(--line-2);color:var(--ink-800);flex:none;align-items:center;gap:9px;padding:6px 15px;font-size:13px;font-weight:600;line-height:1.2;display:flex}.topic-item:last-child{border-right:0}.topic-item .tico{border-radius:9px;flex:none;place-items:center;width:34px;height:34px;display:grid}.three{grid-template-columns:1fr 1fr 1fr;gap:22px;margin-top:22px;display:grid}.qrow{border-bottom:1px solid var(--line-2);gap:12px;padding:14px 0;display:flex}.qrow:last-of-type{border-bottom:0}.qrow .qt{color:var(--ink-900);font-size:14px;font-weight:600;line-height:1.35}.qrow .qm{color:var(--ink-400);margin-top:4px;font-size:12.5px}.ans-pill{border:1px solid var(--blue-100);text-align:center;width:52px;height:52px;color:var(--blue-600);border-radius:12px;flex:none;place-items:center;margin-left:auto;font-size:15px;font-weight:700;line-height:1;display:grid}.ans-pill small{color:var(--ink-400);font-size:10px;font-weight:500}.lead-row{border-bottom:1px solid var(--line-2);align-items:center;gap:12px;padding:11px 0;display:flex}.lead-row:last-child{border-bottom:0}.lead-row .rk{width:16px;color:var(--ink-400);text-align:center;font-size:14px;font-weight:700}.story{border-bottom:1px solid var(--line-2);gap:12px;padding:12px 0;display:flex}.story:last-of-type{border-bottom:0}.story .si{border-radius:50%;flex:none;place-items:center;width:36px;height:36px;display:grid}.story p{color:var(--ink-600);font-size:13.5px;line-height:1.5}.story .sn{color:var(--ink-400);margin-top:4px;font-size:12.5px}.bigstats{border:1px solid var(--line);background:#fff;border-radius:16px;flex-wrap:wrap;justify-content:space-between;gap:18px;margin-top:22px;padding:26px 30px;display:flex}.bigstat{align-items:center;gap:13px;display:flex}.bigstat .bi{width:34px;height:34px;color:var(--blue-600)}.bigstat .bn{color:var(--blue-600);font-family:Poppins;font-size:22px;font-weight:800;line-height:1}.bigstat .bl{color:var(--ink-500);margin-top:3px;font-size:12.5px}.card-head{justify-content:space-between;align-items:center;margin-bottom:6px;display:flex}.card-head h4{color:var(--ink-900);font-family:Poppins;font-size:16px;font-weight:700}.tp-head{grid-template-columns:1.2fr .95fr;align-items:start;gap:44px;padding:40px 0 26px;display:grid}.tp-head h2{letter-spacing:-.025em;color:var(--ink-900);font-size:44px;font-weight:800;line-height:1.05}.tp-head 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