:root{color-scheme:light dark;--bg:#fff;--fg:#2c2c2b;--muted:#66635f;--line:#e6e5e3;--surface:#f9f8f7;--accent:#1769b0}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif}
a{color:inherit;text-underline-offset:4px}a:focus-visible{outline:3px solid var(--accent);outline-offset:4px;border-radius:4px}
.page{width:min(100% - 64px,1000px);margin:0 auto}header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 0;border-bottom:1px solid var(--line)}
.brand{font-size:24px;font-weight:700;text-decoration:none;letter-spacing:-.8px;padding:4px 0}.dot{color:var(--accent)}nav a,footer a{display:inline-flex;align-items:center;min-height:44px;padding:4px 0}
main{padding:64px 0 48px}.eyebrow{margin:0 0 16px;color:var(--accent);font-size:14px;font-weight:600}
h1{font-size:clamp(36px,5vw,56px);line-height:1.13;letter-spacing:-1.8px;margin:0 0 24px;font-weight:700}.lead{font-size:18px;line-height:1.6;max-width:600px;margin:0;color:var(--muted)}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:48px}.grid article{border:1px solid var(--line);border-radius:12px;background:var(--surface);padding:24px}
.number{font-size:14px;letter-spacing:.6px;color:var(--muted);margin:0 0 16px}h2{font-size:24px;line-height:1.3;letter-spacing:-.4px;margin:0 0 12px}.grid article>p:last-child{margin:0;color:var(--muted)}
footer{display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding:16px 0 24px;font-size:14px;color:var(--muted)}
.prose{max-width:640px;margin-top:40px}.prose h2{margin-top:32px}.prose p{color:var(--muted);margin:0}.back{display:inline-flex;align-items:center;min-height:44px;margin-top:24px;color:var(--accent)}
.skip{position:absolute;top:8px;left:8px;transform:translateY(-180%);background:var(--bg);color:var(--accent);padding:8px 16px;border:1px solid var(--line);z-index:1}.skip:focus{transform:none}
@media(max-width:600px){.page{width:calc(100% - 40px)}header{padding:16px 0;gap:16px}.brand{font-size:22px}main{padding:40px 0 32px}h1{letter-spacing:-1.2px}.lead{font-size:17px}.wide{display:none}.grid{grid-template-columns:1fr;gap:16px;margin-top:32px}.grid article{padding:24px}footer{align-items:flex-start;flex-direction:column;gap:0}.prose{margin-top:32px}}
@media(prefers-color-scheme:dark){:root{--bg:#191919;--fg:#fff;--muted:#b9b7b3;--line:#464644;--surface:#202020;--accent:#5e9fe8}}