:root{--bg:#f6f8fa;--fg:#161b22;--muted:#586069;--line:#d8dee4;--accent:#0a6a8a;--panel:#ffffff;color-scheme:light}
:root[data-theme="dark"]{--bg:#0e1217;--fg:#e4e8ed;--muted:#8d97a3;--line:#252c35;--accent:#5cc8e6;--panel:#141a21;color-scheme:dark}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0e1217;--fg:#e4e8ed;--muted:#8d97a3;--line:#252c35;--accent:#5cc8e6;--panel:#141a21;color-scheme:dark}}
*{box-sizing:border-box}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;min-height:100vh;display:flex;flex-direction:column;background:var(--bg);color:var(--fg);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;padding:env(safe-area-inset-top,0px) 0 env(safe-area-inset-bottom,0px)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
a{color:var(--accent);text-underline-offset:3px}
a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}
header,main,footer{width:100%;max-width:680px;margin:0 auto;padding-left:24px;padding-right:24px}
header{display:flex;justify-content:space-between;align-items:center;padding-top:28px;padding-bottom:12px;gap:16px}
.brand{font-size:.95rem;color:var(--fg);text-decoration:none}
.brand b{color:var(--accent);font-weight:600}
nav{display:flex;align-items:center;gap:20px;font-size:.95rem}
nav a{color:var(--muted);text-decoration:none}
nav a:hover,nav a[aria-current="page"]{color:var(--fg)}
#theme-toggle{background:none;border:1px solid var(--line);color:var(--muted);width:34px;height:34px;border-radius:6px;cursor:pointer;font-size:1rem;line-height:1}
#theme-toggle:hover{color:var(--fg);border-color:var(--muted)}
main{flex:1;padding-top:12vh;padding-bottom:64px}
h1{font-size:clamp(2.2rem,7vw,3.2rem);line-height:1.1;margin:0 0 16px;letter-spacing:-.02em;font-weight:650}
h2{font-size:1.05rem;margin:40px 0 8px;font-weight:650}
p{margin:0 0 16px;max-width:60ch}
.meta{color:var(--muted);font-size:.9rem;margin-bottom:28px}
.lead{font-size:1.2rem;color:var(--fg)}
.box{border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:16px 20px;margin-top:32px;font-size:.95rem}
.box p{margin:0}
footer{padding-top:20px;padding-bottom:28px;border-top:1px solid var(--line);color:var(--muted);font-size:.85rem;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
@media (prefers-reduced-motion:no-preference){body{animation:in .4s ease-out}@keyframes in{from{opacity:0}to{opacity:1}}}