:root{--paper:#f7f7ed;--ink:#19332d;--green:#13785d;--line:#d7e3d9;--muted:#60746b}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 system-ui,Segoe UI,sans-serif}a{color:var(--green);text-decoration:none}a:hover{text-decoration:underline}.shell{max-width:1320px;margin:auto;padding:24px}.nav{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:16px}.brand{font-weight:800;font-size:1.3rem;color:var(--ink)}.navlinks{display:flex;gap:18px}.hero{padding:55px 0 30px}.eyebrow{letter-spacing:.15em;text-transform:uppercase;color:var(--green);font-size:.78rem;font-weight:800}h1{font-family:Georgia,serif;font-size:clamp(2.1rem,5vw,4.4rem);line-height:1.12;max-width:950px;margin:12px 0}h2{font-family:Georgia,serif;font-size:1.8rem}.lead{font-size:1.15rem;max-width:850px;color:var(--muted)}.stats{display:flex;gap:24px;flex-wrap:wrap;padding:20px 0}.stat strong{display:block;font-size:1.8rem;color:var(--green)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}.tile{display:block;background:white;border:1px solid var(--line);border-radius:13px;padding:20px;color:var(--ink);box-shadow:0 3px 13px #163b2310}.tile:hover{border-color:var(--green);text-decoration:none}.tile small{color:var(--green);font-weight:700}.tile h3{font-family:Georgia,serif;font-size:1.3rem;line-height:1.25}.tile p{color:var(--muted)}.search{width:100%;max-width:580px;padding:14px 18px;border:1px solid #b8cec0;border-radius:10px;font:inherit}.lecture-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:25px}.sidebar{position:sticky;top:12px;align-self:start;max-height:90vh;overflow:auto;background:white;padding:18px;border:1px solid var(--line);border-radius:12px}.sidebar a{display:block;padding:7px;border-radius:6px;font-size:.85rem}.sidebar a:hover{background:#eaf4ed}.paper{background:white;border:1px solid var(--line);border-radius:12px;padding:20px;margin:18px 0}.page-image{display:block;width:100%;height:auto;border:1px solid #d8d8d8;box-shadow:0 5px 16px #0001;background:white}.page-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.extract{white-space:pre-wrap;overflow-wrap:anywhere;font:13px/1.6 ui-monospace,monospace;background:#f6f8f5;padding:15px;max-height:450px;overflow:auto}.math-note{background:#eaf5ed;border-left:4px solid var(--green);padding:16px;margin:20px 0}.pager{display:flex;justify-content:space-between;gap:16px;margin:30px 0}.footer{border-top:1px solid var(--line);padding:25px 0;margin-top:40px;color:var(--muted)}.chip{display:inline-block;border:1px solid var(--line);padding:4px 9px;border-radius:15px;font-size:.8rem;margin:4px}.equation{overflow:auto;padding:18px;background:#f0f6f1;border-radius:10px;text-align:center}@media(max-width:800px){.lecture-layout{display:block}.sidebar{position:static;max-height:220px;margin-bottom:20px}.shell{padding:15px}.paper{padding:10px}}