:root{--ink:#172033;--muted:#5b6475;--brand:#176b50;--line:#e3e8ef;--paper:#fff;--soft:#f4f7f6;--accent:#e9f5ef}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.7 system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--ink);background:#f7f9fb}
a{color:#126b52;text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:1120px;margin:auto;padding:0 20px}
header{background:#102a24;color:#fff}.top{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 0}.brand{font-size:1.3rem;font-weight:800;color:#fff}.nav a{color:#e8f5ef;margin-left:18px}
.hero{padding:42px 0 48px}.hero h1{font-size:clamp(2rem,5vw,3.4rem);line-height:1.1;max-width:850px;margin:0 0 18px}.hero p{max-width:760px;color:#d8e8e2;font-size:1.08rem}
main{padding:28px 0 60px}.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:26px}.panel,.article-card,.sidebar-card{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:0 4px 18px #17203308}
h2{line-height:1.25;margin-top:0}h3{line-height:1.3}.search{display:flex;gap:10px;margin:20px 0}.search input{width:100%;min-width:0;padding:13px 14px;border:1px solid #cbd5df;border-radius:10px;font:inherit}.pill{display:inline-block;background:var(--accent);color:#155d46;padding:4px 10px;border-radius:99px;font-size:.82rem;font-weight:700}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.article-card{padding:18px}.article-card h3{font-size:1.05rem;margin:8px 0}.article-card p{font-size:.92rem;color:var(--muted);margin:0}.formula{display:block;white-space:pre-wrap;overflow-wrap:anywhere;background:#f0f4f8;border:1px solid #dfe6ed;border-radius:10px;padding:14px;font: .95rem ui-monospace,SFMono-Regular,Consolas,monospace;color:#152b45}
.ad-slot{border:2px dashed #c5ced8;background:#f8fafc;color:#697586;text-align:center;border-radius:12px;padding:18px;margin:22px 0;font-size:.86rem;min-height:100px;display:flex;flex-direction:column;align-items:center;justify-content:center}.ad-slot small{display:block}.toc{background:#f6faf8;border-left:4px solid var(--brand);padding:14px 18px;margin:22px 0}.breadcrumbs{font-size:.9rem;color:var(--muted);margin-bottom:14px}.meta{color:var(--muted);font-size:.9rem}.btn{display:inline-block;background:var(--brand);color:#fff;padding:10px 16px;border-radius:9px;font-weight:700;border:0;cursor:pointer}.pagination{display:flex;justify-content:center;gap:10px;align-items:center;margin-top:24px}.sidebar-card{margin-bottom:18px}.sidebar-card ul{padding-left:20px}.note{background:#fff7df;border:1px solid #f0dfaa;padding:14px;border-radius:10px}
footer{background:#102a24;color:#d9e8e2;padding:30px 0}footer a{color:#fff}.footer-links{display:flex;flex-wrap:wrap;gap:16px}
@media(max-width:850px){.layout{grid-template-columns:1fr}.nav{display:none}.grid{grid-template-columns:1fr}.top{padding:16px 0}.panel{padding:18px}}