:root{--navy:#16324f;--teal:#087e8b;--coral:#d5523f;--ink:#1c2935;--ink-muted:#596873;--paper:#fffef9;--canvas:#f5f1e8;--sand:#e8dfcf;--sky:#eaf5f5;--line:#c9d0d2;--shadow:0 12px 32px #16324f14;--font-display:Georgia, "Times New Roman", serif;color:var(--ink);background:var(--canvas);font-synthesis:none;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{min-width:320px;margin:0;line-height:1.6}a{color:var(--navy);text-underline-offset:.2em}button{background:var(--coral);color:#fff;font:inherit;cursor:pointer;border:0;border-radius:.45rem;padding:.7rem 1rem;font-weight:700}button.secondary{color:var(--navy);border:1px solid var(--line);background:#fff}button:disabled{opacity:.4;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible{outline-offset:3px;outline:3px solid #f2a541}h1,h2,h3{font-family:var(--font-display);color:var(--navy);text-wrap:balance;line-height:1.12}h1{margin:0 0 1rem;font-size:clamp(2.4rem,7vw,5rem)}h2{font-size:clamp(1.7rem,4vw,2.5rem)}p{max-width:70ch}.eyebrow{color:var(--coral);letter-spacing:.11em;text-transform:uppercase;margin:0 0 .6rem;font-size:.78rem;font-weight:800}.lede{color:var(--ink-muted);font-size:clamp(1.05rem,2vw,1.3rem)}.skip-link{z-index:10;background:#fff;padding:.6rem;position:fixed;top:-5rem;left:1rem}.skip-link:focus{top:1rem}.site-header{justify-content:space-between;align-items:center;gap:2rem;max-width:1200px;margin:auto;padding:1rem 1.5rem;display:flex}.brand{line-height:1.2;text-decoration:none;display:grid}.brand span{font:700 1.15rem var(--font-display)}.brand small{color:var(--ink-muted)}.site-header nav{gap:1.25rem;display:flex}.site-header nav a{font-size:.9rem;font-weight:650;text-decoration:none}main{min-height:75vh}footer{border-top:1px solid var(--line);max-width:1200px;color:var(--ink-muted);margin:3rem auto 0;padding:1.5rem;font-size:.85rem}.shell{max-width:1120px;margin:auto;padding:clamp(2rem,7vw,6rem) 1.5rem}.hero{background:linear-gradient(135deg, var(--navy), #245a70);color:#fff}.hero h1,.hero .eyebrow{color:#fff}.hero .lede{color:#d8eaed}.cards{grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem;margin-top:2rem;display:grid}.card{border:1px solid var(--line);background:var(--paper);box-shadow:var(--shadow);border-radius:.8rem;padding:1.4rem}.card h2,.card h3{margin-top:0}.card a{font-weight:750}.module-header{max-width:1120px;margin:auto;padding:3rem 1.5rem 1.5rem}.module-body{max-width:1120px;margin:auto;padding:0 1.5rem 3rem}.callout{border-left:.3rem solid var(--teal);background:var(--sky);padding:1rem 1.2rem}.equation{font:1.3rem var(--font-display);text-align:center;background:var(--canvas);border-radius:.6rem;margin:1.5rem 0;padding:1.25rem}@media (width<=700px){.site-header{align-items:flex-start}.site-header nav{text-align:right;flex-direction:column;gap:.25rem}.brand small{display:none}}.source-note{color:var(--ink-muted);font-size:.82rem}