.catalog-search{margin:12px 0 42px;padding:30px;border:1px solid #3a526b;border-radius:22px;background:radial-gradient(ellipse at top right,#233f54,transparent 70%),#14243a}.catalog-search label{display:block;font-size:24px;font-weight:700;margin-bottom:18px}.search-line{display:flex;align-items:center;gap:14px;background:#0b1728;border:1px solid #536a80;border-radius:12px;padding:5px 15px}.search-line>span{font-size:32px;color:var(--blue)}.search-line input{width:100%;min-width:0;background:transparent;border:0;color:#fff;padding:15px 0;font-size:18px}.search-line input::placeholder{color:#a5b5c9}.search-line button{padding:4px 12px;font-size:24px}.search-chips{display:flex;gap:8px;flex-wrap:wrap}.search-chips button{font-size:13px;padding:9px 14px;border-radius:30px;background:#1c3248}.catalog-heading{display:flex;align-items:center;justify-content:space-between;gap:22px;margin-bottom:24px}.catalog-heading h2{margin-top:10px}.start-link{color:var(--orange);font-size:14px;white-space:nowrap;text-underline-offset:5px}.category-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.category-card{padding:26px;border:1px solid var(--line);border-radius:20px;background:var(--panel)}.category-art{display:flex;align-items:center;gap:20px;color:var(--blue)}.category-art svg{width:100px;height:78px}.category-art span{color:var(--muted);font-size:11px;letter-spacing:2px}.category-card:nth-child(2n) .category-art{color:var(--orange)}.category-card h3{font-size:26px;margin:16px 0 22px;letter-spacing:-.6px}.topic-row{display:flex;flex-direction:column;gap:7px;text-decoration:none;padding:18px 0;border-top:1px solid var(--line);line-height:1.5}.topic-row strong{font-size:17px}.topic-row span{font-size:14px;color:var(--muted)}.topic-row small{color:var(--orange);font-weight:600;font-size:12px}.topic-row[href]:hover strong{color:var(--blue)}.topic-row[href]:focus-visible{outline:2px solid var(--blue);outline-offset:5px}.upcoming small{color:#a5b5c9}.catalog-note{margin-top:26px}.catalog-pulse{animation:catalogPulse 3s ease-in-out infinite}@keyframes catalogPulse{50%{opacity:.25}}#topicResults{margin-bottom:35px}#resultList{max-width:850px}#resultList .topic-row{padding:22px;background:var(--panel);margin:12px 0;border:1px solid var(--line);border-radius:14px}@media(max-width:650px){.category-grid{grid-template-columns:1fr}.catalog-search{padding:20px}.catalog-heading{align-items:flex-start;flex-direction:column}.search-line input{font-size:16px}.category-card{padding:22px}}@media(prefers-reduced-motion:reduce){.catalog-pulse{animation:none}}

.math-start{display:grid;grid-template-columns:1.7fr 1fr;align-items:center;gap:25px;margin:8px 0 28px;padding:30px 34px;border:1px solid #516c80;border-radius:22px;background:linear-gradient(125deg,#20384d,#12243a);text-decoration:none}.math-start h2{font-size:clamp(26px,3vw,36px);margin:13px 0;line-height:1.2;letter-spacing:-1px}.math-start p{max-width:540px;font-size:15px}.math-start strong{color:var(--orange);font-size:15px}.math-start svg{width:100%;max-height:220px}.math-start:hover{border-color:var(--orange)}.math-start-shape{transform-origin:80px 175px;animation:mathShape 6s ease-in-out infinite}.math-start-dot{animation:mathDot 6s ease-in-out infinite}@keyframes mathShape{50%{transform:scale(.8,1.2)}}@keyframes mathDot{50%{transform:translateY(-22px)}}@media(max-width:650px){.math-start{grid-template-columns:1fr;padding:24px}.math-start svg{display:none}}@media(prefers-reduced-motion:reduce){.math-start-shape,.math-start-dot{animation:none}}