:root{color-scheme:light;--ink:#182b34;--accent:#145c53;--line:#cddbd6}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:#f6f7f2;font:17px/1.6 system-ui,-apple-system,sans-serif}main{max-width:1120px;margin:auto;padding:32px 24px 72px}nav{font-size:15px}a{color:var(--accent);text-underline-offset:3px}header{max-width:820px;padding:42px 0 24px}.eyebrow{font-size:13px;letter-spacing:.16em;font-weight:750;color:var(--accent)}h1{font-size:clamp(2.4rem,5vw,3.8rem);line-height:1.1;margin:12px 0 20px;letter-spacing:-.04em}h2{line-height:1.25}h3{margin:0 0 12px;font-size:1.35rem}.intro{font-size:1.2rem}.setup,.activity{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px}.setup{margin-bottom:44px;border-top:4px solid var(--accent)}form{display:grid;grid-template-columns:1fr 1fr;gap:16px}label{display:grid;gap:6px;font-weight:650}input,select,button{font:inherit;border-radius:8px;padding:10px 12px;border:1px solid #96b2a8;max-width:100%;min-width:0}button{cursor:pointer;background:var(--accent);color:white;width:fit-content}button:disabled{opacity:.6;cursor:wait}#code-help{grid-column:1/-1;font-size:14px;margin:0}#catalog{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.activity{display:flex;flex-direction:column}.activity p{margin-top:0}.activity ul{padding-left:22px}.activity details{margin-bottom:18px}.activity .actions{margin-top:auto}.activity .kind{font-size:13px;color:#4b665e;font-weight:650}#generated{margin-top:20px;background:#edf4ef;padding:18px;border-radius:10px}#generated a{overflow-wrap:anywhere}#generated li{margin:14px 0}#generated button{font-size:14px;margin-left:10px}.warning{color:#8a3b00}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #e29535;outline-offset:3px}@media(max-width:720px){#catalog,form{grid-template-columns:1fr}main{padding:24px 16px}.setup,.activity{padding:20px}}

/* Catalog cards: separate reading, teaching detail, and try/teach actions. */
#catalog{gap:28px;align-items:stretch}
#catalog .activity{padding:30px}
#catalog .kind{font-size:11px;letter-spacing:.08em;line-height:1.5;margin-bottom:16px}
#catalog h3{font-family:Georgia,"Times New Roman",serif;font-size:1.65rem;font-weight:600;line-height:1.2;letter-spacing:-.02em;margin-bottom:18px}
#catalog .description{margin-bottom:22px;line-height:1.65}
#catalog .ai-relevance{padding:16px 18px;background:#f3f6f2;border-radius:10px;margin-bottom:22px;font-size:16px;line-height:1.6}
#catalog .ai-relevance p{margin:0}
#catalog .ai-relevance .relevance-label{font-size:11px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:#4b665e;margin-bottom:7px}
#catalog details{font-size:15px;margin-bottom:24px}
#catalog summary{cursor:pointer;font-weight:600;line-height:1.5}
#catalog details[open] summary{margin-bottom:16px}
#catalog .teaching-links{display:flex;flex-direction:column;align-items:flex-start;gap:12px;padding-top:8px}
#catalog .actions{border-top:1px solid var(--line);padding-top:20px;display:flex;flex-direction:column;align-items:flex-start;gap:14px}
#catalog .preview-links{display:flex;flex-wrap:wrap;gap:12px 24px;font-size:15px;font-weight:600}
#catalog .preview-links a{padding:4px 0;line-height:1.5}
#catalog .preview-note{font-size:13px;line-height:1.55;color:#53645e;margin:0;max-width:48ch}
#catalog .actions button{font-size:15px;padding:10px 16px;margin-top:3px}
@media(max-width:720px){#catalog .activity{padding:24px}#catalog h3{font-size:1.5rem}}