:root{--ink:#172526;--muted:#5a6967;--paper:#f4f0e7;--card:#fffdf7;--line:#d9d4c8;--navy:#102f38;--teal:#1d6b68;--clay:#b85c38;--gold:#ddb967;--focus:#0067c5;color-scheme:light}
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0}.catalog-tools input,.catalog-tools select{width:100%;padding:.8rem;border:1px solid var(--line);border-radius:6px;background:var(--card);font:inherit}.catalog-list{display:grid;grid-template-columns:repeat(2,1fr);gap:.7rem}.lesson-link{display:flex;gap:.8rem;align-items:flex-start;background:var(--card);border:1px solid var(--line);padding:.9rem;border-radius:7px;text-decoration:none;color:var(--ink)}.lesson-link:hover{border-color:var(--teal);transform:translateY(-1px)}.lesson-code{font-size:.72rem;color:var(--clay);font-weight:850;white-space:nowrap}.lesson-title{font-size:.92rem;line-height:1.35}.doc{max-width:900px;margin:2.5rem auto 5rem;background:var(--card);border:1px solid var(--line);padding:clamp(1.2rem,4vw,3.4rem);box-shadow:0 18px 50px rgba(22,43,43,.08)}.doc h1{font-family:Georgia,serif;font-size:clamp(2rem,4vw,3.25rem);line-height:1.05;margin-top:.3rem}.doc h2{font-family:Georgia,serif;font-size:1.65rem;margin-top:2.4rem;padding-top:1rem;border-top:1px solid 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.resource-card b{display:block;margin:.15rem 0 .35rem}.resource-card span{display:block}