:root{--bg:#ffffff;--surface:#f7f9fc;--card:#ffffff;--text:#172033;--muted:#5d6879;--border:#dce3ec;--primary:#2563eb;--primary-strong:#1d4ed8;--success:#0f766e;--danger:#b42318;--shadow:0 12px 30px rgba(19,35,62,.08);--radius:18px;color-scheme:light}
:root[data-theme="dark"]{--bg:#0f141b;--surface:#161d26;--card:#151b23;--text:#edf2f7;--muted:#a9b4c2;--border:#2b3746;--primary:#60a5fa;--primary-strong:#93c5fd;--success:#5eead4;--danger:#fca5a5;--shadow:0 16px 40px rgba(0,0,0,.28);color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:inherit}button,input,textarea,select{font:inherit}button{cursor:pointer}img{max-width:100%;display:block}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:12px;top:-60px;background:var(--card);color:var(--text);padding:10px 14px;border:1px solid var(--border);border-radius:8px;z-index:100}.skip-link:focus{top:12px}.eyebrow{font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;font-weight:800;color:var(--primary)}h1,h2,h3,h4{line-height:1.2;margin:.2rem 0 .8rem}h1{font-size:clamp(2.4rem,6vw,4.6rem);letter-spacing:-.04em}h2{font-size:clamp(1.8rem,3vw,2.7rem)}h3{margin-top:2.4rem}p{margin:.65rem 0;color:var(--muted)}strong{color:var(--text)}code{background:var(--surface);border:1px solid var(--border);padding:.12em .35em;border-radius:5px}.lead{font-size:1.12rem}.section-pad{padding:76px 0}.alt-section{background:var(--surface)}