:root{--bg:#f7faf6;--fg:#1f2a22;--muted:#5f6f63;--line:#dfe8dc;--accent:#2f6b45;--chip:#e6f0e4}
@media (prefers-color-scheme:dark){:root{--bg:#141a16;--fg:#e6ede7;--muted:#93a398;--line:#25302a;--accent:#7bbf94;--chip:#1e2a22}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);
font:16px/1.65 "Segoe UI",system-ui,-apple-system,sans-serif}
.wrap{max-width:50rem;margin:0 auto;padding:0 1.5rem}
header{background:var(--chip);border-bottom:1px solid var(--line);padding:1.2rem 0}
header .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.brand{font-weight:700;font-size:1.15rem;color:var(--fg);text-decoration:none}
.brand small{display:block;font-weight:400;font-size:.75rem;color:var(--muted);margin-top:.1rem}
nav a{color:var(--muted);text-decoration:none;margin-left:1.3rem;font-size:.9rem}
nav a:hover{color:var(--accent)}
h1{font-size:1.75rem;margin:2rem 0 .8rem;font-weight:700;letter-spacing:-.01em}
h2{font-size:1.05rem;margin:2.4rem 0 .8rem;font-weight:700}
p{margin:0 0 1rem}
.lead{color:var(--muted);font-size:1.05rem}
.course{display:flex;gap:1rem;align-items:baseline;border-bottom:1px solid var(--line);
padding:.85rem 0;flex-wrap:wrap}
.lvl{background:var(--chip);color:var(--accent);border-radius:999px;padding:.15rem .7rem;
font-size:.76rem;font-weight:700;letter-spacing:.03em;white-space:nowrap}
.course .name{font-weight:600;flex:1;min-width:12rem}
.course .when{color:var(--muted);font-size:.9rem;white-space:nowrap}
dl{display:grid;grid-template-columns:9rem 1fr;gap:.5rem 1rem;margin:1rem 0 0}
dt{color:var(--muted)}
dd{margin:0}
a.cta{color:var(--accent);font-weight:600}
footer{border-top:1px solid var(--line);margin-top:3rem;padding:1.6rem 0 3rem;
color:var(--muted);font-size:.85rem}