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h1{font-size:35px}.lesson-section{padding:18px}.lesson-hero{padding:25px 22px}.option-list{grid-template-columns:1fr}.search-panel{flex-wrap:wrap}.search-panel label{width:100%}.paper-cards{grid-template-columns:1fr}.chapter-menu{grid-template-columns:1fr}.lesson-actions{flex-wrap:wrap}.chapter-next{flex-wrap:wrap}.site-footer{font-size:8px}}

/* ---- Advertising (see advertising.html): reserved, labelled, non-shifting ---- */
.ad-slot{margin:18px auto;display:flex;align-items:center;justify-content:center;min-height:0;overflow:hidden;border:1px dashed rgba(45,36,50,.18);border-radius:10px;background:rgba(45,36,50,.03)}
.ad-slot:empty::before{content:"Advertisement";font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:rgba(45,36,50,.42);padding:6px 0}
.ad-slot--leaderboard{max-width:768px;min-height:94px}
.ad-slot--rectangle{max-width:320px;min-height:254px;float:right;margin:8px 0 16px 24px}
.ad-fallback{font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:rgba(45,36,50,.42);padding:10px}
.footer-links{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;width:100%;margin-top:8px}
.footer-links a{color:inherit;opacity:.75;text-decoration:none;font-size:12.5px}
.footer-links a:hover{opacity:1;text-decoration:underline}
@media (max-width:760px){.ad-slot--rectangle{float:none;margin:18px auto}}
@media (prefers-color-scheme: dark){.ad-slot{border-color:rgba(246,241,233,.16);background:rgba(246,241,233,.04)}.ad-slot:empty::before,.ad-fallback{color:rgba(246,241,233,.45)}}