:root{color-scheme:dark;--bg:#080f1d;--panel:#101e32;--line:#2b3f59;--text:#edf4ff;--muted:#aebed4;--blue:#71b5ff;--mint:#83e2c8}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at top right,#153252,transparent 65%),var(--bg);color:var(--text);font:17px/1.65 system-ui,sans-serif}a{color:var(--blue)}header{display:flex;justify-content:space-between;gap:16px;padding:20px max(5vw,20px);border-bottom:1px solid var(--line);background:#080f1df5}header a{text-decoration:none;font-size:13px}.brand{font-weight:800;letter-spacing:.1em;color:var(--text)}.brand span{color:var(--muted);font-weight:400}main{max-width:1160px;margin:auto;padding:48px 24px}.intro{max-width:850px}.eyebrow{font-size:12px;letter-spacing:.16em;color:var(--mint);font-weight:700}h1{font-size:clamp(35px,5vw,60px);line-height:1.12;letter-spacing:-.045em;margin:18px 0}h2{font-size:clamp(27px,3vw,38px);line-height:1.2;letter-spacing:-.025em}h3{font-size:20px}.lead{color:var(--muted);max-width:700px}.tags{display:flex;flex-wrap:wrap;gap:10px}.tags span,.tag{border:1px solid var(--line);border-radius:30px;padding:5px 12px;font-size:12px;color:var(--mint)}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:36px 0 20px}button,select{font:inherit;color:var(--text);background:var(--panel);border:1px solid var(--line);padding:12px 18px;border-radius:10px;cursor:pointer}button[aria-current=step]{background:#1a4169;border-color:var(--blue)}button:disabled{opacity:.35;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--mint);outline-offset:4px}.chapter{border:1px solid var(--line);border-radius:20px;padding:32px;background:#0c1728e8}.chapter[hidden]{display:none}.chapter>p{max-width:900px}.metrics,.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:26px 0}article{padding:22px;border:1px solid var(--line);background:var(--panel);border-radius:14px;min-width:0}article small,article span{display:block;color:var(--muted);font-size:13px}article strong{display:block;font-size:32px;color:var(--mint);margin:10px 0;overflow-wrap:anywhere}article p{font-size:15px;color:var(--muted)}.note{font-size:13px;color:var(--muted);overflow-wrap:anywhere}.action{display:inline-block;margin-top:12px;text-decoration:none;font-weight:650}.strip{padding:20px;border-left:3px solid var(--mint);background:var(--panel)}.arena{display:grid;grid-template-columns:1fr 1fr;gap:32px}li{margin:12px 0}.calculator{padding:24px;background:var(--panel);border-radius:14px}.calculator label,.calculator small{display:block}.calculator input{display:block;width:100%;margin:20px 0;accent-color:var(--mint)}.calculator select{width:100%;margin-top:8px}.calculator strong{display:block;font-size:45px;color:var(--mint);margin-top:12px}.calculator p,.calculator small{color:var(--muted);font-size:13px}.controls{display:flex;align-items:center;justify-content:space-between;margin-top:20px;gap:12px}footer{padding:30px 24px;text-align:center;color:var(--muted);font-size:12px}@media(max-width:700px){header{flex-wrap:wrap}.brand span{display:none}main{padding:28px 16px}.chapter{padding:22px 18px}.metrics,.cards,.arena{grid-template-columns:1fr}.steps{grid-template-columns:1fr 1fr}.steps button{font-size:14px}.controls button{font-size:13px;padding:12px}h1 br{display:none}}