:root{--bg:#eef4f6;--ink:#17283a;--muted:#4f6470;--deep:#142a27;--lime:#d9f36b;--line:#d3e0e5;--card:#fbfdfd;--teal:#2d6b62;--mono:'DM Mono',ui-monospace,monospace;--sans:'Manrope',system-ui,sans-serif;--disp:'Space Grotesk',system-ui,sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.7 var(--sans)}
a{color:var(--teal);text-underline-offset:3px}
a:hover{color:var(--deep)}
:focus-visible{outline:3px solid #2d6b62;outline-offset:3px;border-radius:4px}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:12px;top:-60px;background:var(--lime);color:var(--deep);padding:10px 14px;border-radius:8px;font-weight:700;z-index:10}
.skip:focus{top:12px}
main:focus{outline:none}
.top{background:var(--deep);color:#dce9df}
.top-in{display:flex;align-items:center;justify-content:space-between;padding-top:14px;padding-bottom:14px;gap:12px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none}
.brand strong{font:700 18px/1 var(--disp);display:block}
.brand small{font:400 9px/1 var(--mono);letter-spacing:.22em;text-transform:uppercase;color:#90a6a5}
.mark{width:32px;height:32px;border-radius:9px;background:var(--lime);color:var(--deep);display:grid;place-items:center;font:700 18px var(--disp)}
.back{color:var(--deep);background:var(--lime);padding:8px 14px;border-radius:10px;font-weight:700;font-size:14px;text-decoration:none}
.back:hover{color:var(--deep);background:#e6fa95}
.back:focus-visible,.brand:focus-visible{outline-color:var(--lime)}
.hero{background:var(--deep);color:#e6efe9;padding:48px 0 64px;border-bottom:4px solid var(--lime)}
.kicker{font:500 11px var(--mono);letter-spacing:.22em;text-transform:uppercase;color:var(--lime);margin:0}
h1{font:700 clamp(36px,6vw,64px)/1.05 var(--disp);margin:12px 0 16px;letter-spacing:-.02em;color:#fff}
.lede{max-width:640px;font-size:19px;color:#c4d6cf;margin:0}
.age{margin:24px 0 0;font-size:14px;color:#a9bfb8;display:flex;align-items:center;gap:10px}
.age span,.badge{font:500 12px var(--mono);background:var(--lime);color:var(--deep);padding:3px 8px;border-radius:6px}
.layout{display:grid;grid-template-columns:230px 1fr;gap:48px;padding-top:40px;padding-bottom:64px}
.toc{position:sticky;top:20px;align-self:start;font-size:14px}
.toc-h{font:500 10px var(--mono);letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}
.toc ol{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.toc a{display:block;padding:6px 12px;color:var(--muted);text-decoration:none;margin-left:-2px;border-left:2px solid transparent}
.toc a:hover{color:var(--deep);border-left-color:var(--teal)}
.prose{max-width:720px;min-width:0}
.prose section{padding:8px 0 28px;border-bottom:1px solid var(--line);margin-bottom:28px;scroll-margin-top:20px}
.prose section:last-child{border:0}
h2{font:700 clamp(24px,3vw,30px)/1.2 var(--disp);margin:0 0 14px;color:var(--deep)}
h3{font:600 19px/1.3 var(--disp);margin:22px 0 6px;color:var(--ink)}
p{margin:0 0 14px}
ul{padding-left:20px}
li{margin-bottom:6px}
code{font:500 15px var(--mono);background:#dfeaee;padding:2px 6px;border-radius:5px}
.note{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--lime);border-radius:12px;padding:16px 20px;margin:18px 0}
.note-h{font:500 10px var(--mono);letter-spacing:.2em;text-transform:uppercase;color:var(--teal);margin-bottom:6px}
.note p:last-child{margin:0}
details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:10px}
summary{cursor:pointer;padding:14px 18px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font:500 20px var(--mono);color:var(--teal)}
details[open] summary::after{content:"\2212"}
summary h3{margin:0;font-size:17px;display:inline}
details p{padding:0 18px 14px;margin:0;color:var(--muted)}
.cta{display:inline-block;background:var(--deep);color:#fff;text-decoration:none;font-weight:700;padding:12px 18px;border-radius:10px;margin-top:8px}
.cta:hover{color:var(--lime)}
.foot{background:var(--deep);color:#c4d6cf;font-size:14px}
.foot-in{padding-top:26px;padding-bottom:26px}
.foot a{color:var(--lime)}
.foot a:focus-visible{outline-color:var(--lime)}
.small{font-size:13px;color:#90a6a5;margin:0}
.top-in{flex-wrap:wrap}
.prose a{overflow-wrap:anywhere}
.prose ol{padding-left:24px}
@media (max-width:820px){.layout{grid-template-columns:1fr;gap:24px}.toc{position:static;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px}.hero{padding:36px 0 44px}.back{font-size:13px;padding:7px 10px}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}