.topic-discovery{padding-bottom:32px}.topic-intro{display:flex;align-items:center;gap:24px;padding-block:24px}.topic-intro>img{flex:none;width:80px;height:80px}.topic-intro h1{font-size:clamp(28px,4vw,44px);line-height:1.15;margin:0 0 12px}.topic-intro p{margin:8px 0;line-height:1.6}.topic-discovery .topic-note{font-size:14px;color:var(--muted);line-height:1.6}.topic-discovery h2{font-size:24px;line-height:1.3;margin:0 0 20px}.topic-start{padding-block:16px 24px}.topic-levels{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.topic-level{display:flex;flex-direction:column;padding:24px;border:1px solid var(--line);border-top:4px solid var(--green);border-radius:16px;background:var(--card);color:var(--ink)}.topic-level-medium{border-top-color:var(--yellow)}.topic-level-hard{border-top-color:var(--navy)}.topic-level-label{font-size:14px;font-weight:800;color:var(--navy)}.topic-level h3{font-size:21px;line-height:1.35;margin:12px 0}.topic-level p{font-size:16px;line-height:1.6;color:var(--muted);margin:0 0 20px}.topic-play{display:flex;justify-content:space-between;gap:12px;margin-top:auto;font-size:16px;font-weight:800;color:var(--navy);min-height:32px;align-items:center}.topic-level:hover .topic-play,.topic-reading a:hover strong{text-decoration:underline;text-underline-offset:4px}.topic-discovery a:focus-visible,.topic-discovery summary:focus-visible{outline:3px solid var(--navy);outline-offset:4px}.topic-explore{display:grid;grid-template-columns:1fr 1fr;gap:32px;padding-block:24px 32px;border-top:1px solid var(--line)}.topic-explore p{line-height:1.7;margin:0 0 12px;max-width:55ch}.topic-more,.topic-note a{font-weight:700;text-decoration:underline;text-underline-offset:4px}.topic-more{display:inline-flex;align-items:center;min-height:44px;font-size:14px}.topic-reading{display:grid;gap:12px;align-content:start}.topic-reading a{display:grid;grid-template-columns:80px 1fr;gap:16px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--card)}.topic-reading img{width:80px;height:64px;object-fit:cover;border-radius:8px}.topic-reading strong{font-size:17px;line-height:1.45}.topic-faq details{border-top:1px solid var(--line)}.topic-faq summary{padding-block:16px;cursor:pointer;font-size:16px;font-weight:700}.topic-faq p{max-width:70ch;line-height:1.7;margin:0 0 20px}@media(max-width:700px){.topic-intro{gap:16px;align-items:flex-start;padding-top:16px}.topic-intro>img{width:48px;height:48px}.topic-levels,.topic-explore{grid-template-columns:1fr}.topic-level{padding:20px}.topic-level h3{margin:8px 0}.topic-level p{margin-bottom:12px}.topic-explore{gap:20px}.topic-reading strong{font-size:16px}}