:root{--bark:#3a2314;--bark2:#5a3a22;--gold:#e3a41c;--gold-d:#9a6a00;--sage:#e9eddf;--leaf:#2f7d4f;--paper:#fbfaf5;--ink:#2a2118;--muted:#6b5e50;--line:#d9d3c3;color-scheme:light}
@media(prefers-color-scheme:dark){:root{--paper:#1c1510;--sage:#261d15;--ink:#efe7d8;--muted:#b9ac9a;--line:#443628;--gold-d:#e3a41c;--leaf:#6fc28f}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:1.0625rem/1.65 "Source Sans 3",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper)}
h1,h2,h3{font-family:Bitter,Georgia,serif;line-height:1.2;margin:0 0 .6em;color:var(--ink)}
h1{font-size:clamp(2rem,4.5vw,3.3rem)}h2{font-size:clamp(1.5rem,3vw,2.1rem)}h3{font-size:1.2rem}
p{margin:0 0 1em;max-width:68ch}a{color:var(--gold-d)}img{max-width:100%;height:auto;display:block}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
.wrap{width:min(1120px,92%);margin-inline:auto}
header.site{background:var(--bark);position:sticky;top:0;z-index:10}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.5rem 0}
.brand{display:flex;align-items:center;gap:.7rem;color:#fff;text-decoration:none;font:700 1.35rem Bitter,Georgia,serif;letter-spacing:.04em}
.brand img{width:44px;height:auto}
nav ul{display:flex;gap:1.4rem;list-style:none;margin:0;padding:0;flex-wrap:wrap}
nav a{color:#f1e6d2;text-decoration:none;padding:.3rem 0;border-bottom:2px solid transparent}
nav a:hover,nav a[aria-current]{border-color:var(--gold);color:#fff}
.hero{position:relative;background:var(--bark) url(../images/biocrust.jpg) center/cover;color:#fff}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(40,24,12,.92) 30%,rgba(40,24,12,.35))}
.hero .wrap{position:relative;padding:clamp(3rem,9vw,7rem) 0}
.hero h1{color:#fff;max-width:18ch}.hero p{font-size:1.2rem;color:#f1e6d2}
.btn{display:inline-block;background:var(--gold);color:#2a1a08;font-weight:700;padding:.75rem 1.4rem;border-radius:4px;text-decoration:none;margin:.4rem .6rem .4rem 0}
.btn.alt{background:transparent;color:#fff;border:2px solid var(--gold)}
section{padding:clamp(2.5rem,6vw,4.5rem) 0}section.tint{background:var(--sage)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.5rem,4vw,3.5rem);align-items:center}
.split.top{align-items:start}
figure{margin:0}figcaption{font-size:.95rem;color:var(--muted);margin-top:.6rem}
figure img{border-radius:4px;border:1px solid var(--line);background:#fff}
.facts{list-style:none;padding:0;margin:1.5rem 0 0;display:grid;gap:.9rem}
.facts li{padding-left:1.1rem;border-left:4px solid var(--gold)}
.facts strong{font-family:Bitter,Georgia,serif}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem}
.grid.three{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.pagehead{background:var(--bark);color:#fff;padding:clamp(2.2rem,5vw,3.5rem) 0}
.pagehead h1{color:#fff;margin:0 0 .3em}.pagehead p{color:#f1e6d2;margin:0}
.callout{border-left:6px solid var(--leaf);background:var(--sage);padding:1.2rem 1.5rem;margin:1.5rem 0}
section.tint .callout{background:var(--paper)}
footer{background:var(--bark);color:#e6d9c3;padding:2.5rem 0;font-size:.95rem}
footer a{color:var(--gold)}footer .wrap{display:flex;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}
@media(max-width:760px){.split{grid-template-columns:1fr}.hero::before{background:rgba(40,24,12,.85)}header.site .wrap{flex-direction:column}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}