:root{--ink:#152c3b;--muted:#5c6d78;--blue:#165bc4;--paper:#f6f8f9;--line:#dce4e9;--mint:#e3f5ee;--white:#fff}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:inherit}button,input{font:inherit}a,button,input{outline-offset:5px}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--blue)}.skip{position:absolute;left:12px;top:-100px;background:white;padding:8px}.skip:focus{top:10px;z-index:9}.wrap{width:min(1120px,calc(100% - 48px));margin:auto}header{background:white;border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:88px}.brand{text-decoration:none;font-size:22px;font-weight:800;letter-spacing:-.8px;display:flex;align-items:center;gap:12px}.mark{width:35px;height:35px;display:grid;place-items:center;background:var(--blue);color:white;border-radius:11px;font-size:21px}.navlinks{display:flex;gap:32px;align-items:center}.navlinks a{text-decoration:none;color:var(--muted);font-size:14px;font-weight:600}.navlinks a[aria-current=page]{color:var(--blue)}.by{color:var(--muted);font-size:12px;border-left:1px solid var(--line);padding-left:24px}.hero{padding:76px 0 60px;display:grid;grid-template-columns:1.2fr 1fr;gap:72px;align-items:center}.eyebrow{font-size:12px;font-weight:750;letter-spacing:2px;text-transform:uppercase;color:var(--blue);margin:0 0 20px}h1{font-size:clamp(38px,5.5vw,68px);letter-spacing:-3px;line-height:1.08;margin:0 0 24px;font-weight:780}h1 em{color:var(--blue);font-style:normal}h2{font-size:28px;line-height:1.25;letter-spacing:-.7px;margin:0 0 14px}h3{font-size:20px;line-height:1.3;margin:0 0 10px;letter-spacing:-.3px}p{margin:0 0 18px}.lead{font-size:18px;max-width:600px;color:var(--muted)}.buttons{display:flex;gap:14px;flex-wrap:wrap;margin:30px 0 0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:18px;border:1px solid transparent;padding:12px 20px;border-radius:7px;text-decoration:none;font-size:14px;font-weight:700;background:var(--blue);color:white;cursor:pointer}.btn.secondary{background:transparent;border-color:var(--line);color:var(--ink)}.route{background:#112f47;border-radius:16px;box-shadow:0 18px 40px #122f4716;color:#e9f4fc;overflow:hidden}.route-top{padding:16px 22px;border-bottom:1px solid #ffffff20;display:flex;gap:7px;align-items:center;font:12px ui-monospace,monospace;color:#a9c1d3}.dot{width:7px;height:7px;border-radius:50%;background:#618099}.route-top span:last-child{margin-left:14px}.route-body{padding:28px}.route-item{display:flex;gap:16px;padding:17px 0;border-bottom:1px solid #ffffff15}.route-item:last-child{border-bottom:0}.route-num{color:#79b8fb;font:13px ui-monospace,monospace;padding-top:2px}.route-item strong{display:block;font-size:17px}.route-item small{color:#aec3d2;display:block;margin-top:5px}.route-note{display:flex;align-items:center;gap:8px;font-size:12px;color:#b6dfcf;margin:20px 0 0}.status{width:7px;height:7px;border-radius:50%;background:#82d7b0}.section{padding:44px 0}.section-top{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px}.muted{color:var(--muted)}.section-top p{margin:0;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{background:white;border:1px solid var(--line);border-radius:12px;padding:27px;display:flex;flex-direction:column}.card p{color:var(--muted);font-size:15px}.card .link{margin-top:auto;color:var(--blue);font-size:14px;font-weight:750;text-decoration:none;padding-top:14px}.icon{width:42px;height:42px;display:grid;place-items:center;border-radius:11px;background:#eaf1fc;color:var(--blue);margin-bottom:25px;font-size:21px}.tag{font-size:11px;letter-spacing:1px;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:12px}.strip{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center;background:var(--mint);padding:35px 40px;border-radius:12px;margin:6px 0 62px}.strip p{margin:0;color:#3e6658}.strip .buttons{margin:0;justify-content:end}footer{border-top:1px solid var(--line);padding:27px 0;color:var(--muted);font-size:12px}.foot{display:flex;justify-content:space-between;gap:20px}.crumb{padding-top:32px;font-size:12px;color:var(--muted)}.crumb a{text-decoration:none}.page-intro{padding:44px 0 26px;max-width:760px}.page-intro h1{font-size:48px}.page-intro .eyebrow{margin-bottom:15px}.article{max-width:800px;background:white;border:1px solid var(--line);padding:38px;border-radius:12px;margin:12px 0 38px}.article h2{font-size:25px;margin-top:32px}.article h2:first-child{margin-top:0}.article ul{padding-left:23px;color:var(--muted)}.article li{margin-bottom:10px}.next{display:flex;justify-content:space-between;gap:20px;margin:20px 0 60px;font-weight:650;font-size:14px}.next a{color:var(--blue);text-decoration:none}.formula{font:18px ui-monospace,monospace;background:#f2f6f9;border-radius:8px;padding:20px;line-height:1.8}.simulator{background:white;border:1px solid var(--line);border-radius:12px;padding:32px;margin-bottom:26px}.simgrid{display:grid;grid-template-columns:1fr 1fr;gap:44px}.simulator label{display:block;font-weight:650;margin-bottom:8px}.simulator input[type=range]{width:100%;accent-color:var(--blue);margin:12px 0 24px}.result{padding:30px;background:#eaf1fc;border-radius:10px}.big{font-size:64px;line-height:1;font-weight:780;letter-spacing:-3px;color:var(--blue);display:block;margin-bottom:12px}.caption{font-size:12px;color:var(--muted)}.search{padding:12px 15px;border:1px solid var(--line);border-radius:8px;width:min(100%,420px);background:white;margin-bottom:22px}.quiz{padding:32px;background:white;border:1px solid var(--line);border-radius:12px;margin-bottom:35px;max-width:850px}.quiz fieldset{border:0;border-bottom:1px solid var(--line);margin:0 0 26px;padding:0 0 23px}.quiz legend{font-weight:750;margin-bottom:14px}.quiz label{display:block;margin:8px 0;cursor:pointer}.quiz input{accent-color:var(--blue);margin-right:10px}.feedback{padding:16px;border-radius:8px;background:var(--mint);margin-top:22px}.explanations{padding-left:20px}.explanations li{margin:8px 0}.empty{padding:15px;color:var(--muted)}[hidden]{display:none!important}
@media(max-width:800px){.by{display:none}.hero{grid-template-columns:1fr;gap:34px;padding-top:42px}.grid{grid-template-columns:1fr}.strip{grid-template-columns:1fr;padding:25px}.strip .buttons{justify-content:start}.simgrid{grid-template-columns:1fr;gap:12px}.section-top{display:block}.navlinks{gap:18px}.page-intro h1{font-size:38px}.article{padding:24px}.foot{flex-direction:column;gap:6px}}
@media(max-width:430px){.wrap{width:calc(100% - 32px)}.nav{flex-wrap:wrap;gap:10px;padding:16px 0}.navlinks{gap:22px}h1{letter-spacing:-1.7px}.page-intro h1{font-size:35px}.hero{padding-bottom:25px}.route-body{padding:22px}.simulator,.quiz{padding:22px}}