:root{--ink:#1d2a33;--muted:#5b6b75;--bg:#f7f5f0;--card:#fff;--line:#e3ded3;--accent:#d9661f;--accent2:#2f5d50}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55}a{color:var(--accent2)}.wrap{max-width:1080px;margin:0 auto;padding:0 20px}.top{background:#fff;border-bottom:1px solid var(--line)}.nav{justify-content:space-between;align-items:center;padding:14px 20px;gap:10px}.nav,.nav nav{display:flex;flex-wrap:wrap}.nav nav{gap:18px}.nav nav a{font-weight:500}.logo,.nav nav a{text-decoration:none;color:var(--ink)}.logo{font-weight:800;font-size:1.25rem}.logo:before{content:"▣ ";color:var(--accent)}main{padding:28px 20px 60px}h1{font-size:clamp(1.8rem,4vw,2.6rem);line-height:1.15;margin:.3em 0}.lede{font-size:1.15rem;color:var(--muted);max-width:720px}.chips{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}.chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 14px;text-decoration:none;color:var(--ink)}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));grid-gap:16px;gap:16px;margin:16px 0}.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px}.card h3{margin:8px 0;font-size:1.08rem}.card h3 a{color:var(--ink);text-decoration:none}.card p{margin:6px 0}.meta{display:flex;gap:6px;flex-wrap:wrap}.pill{font-size:.75rem;background:#efeae0;border-radius:4px;padding:2px 8px}.diff-easy{background:#dcefe3}.diff-medium{background:#fbe9c9}.diff-hard{background:#f6d3cd}.small{font-size:.88rem;color:var(--muted)}.btn{background:var(--accent);color:#fff;border:0;border-radius:6px;padding:10px 16px;font-weight:600;cursor:pointer;text-decoration:none;display:inline-block}.btn:disabled{background:#b9b3a8;cursor:not-allowed}.signup{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px;margin:28px 0}.signup form{display:flex;gap:8px;flex-wrap:wrap}.filters input,.filters select,.signup input{padding:10px;border:1px solid var(--line);border-radius:6px;font-size:1rem}.signup input{flex:1 1;min-width:220px}.filters{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.filters input{flex:1 1;min-width:220px}.prompt{background:#1d2a33;color:#f2efe8;padding:16px;border-radius:8px;white-space:pre-wrap;font-family:ui-monospace,Menlo,monospace;font-size:.9rem}.callout{border-left:4px solid var(--accent);padding:12px 16px;margin:16px 0}.callout,.foot{background:#fff}.foot{border-top:1px solid var(--line);padding:20px 0}dl.facts{display:grid;grid-template-columns:160px 1fr;grid-gap:6px 16px;gap:6px 16px}dl.facts dt{font-weight:600}@media (max-width:600px){dl.facts{grid-template-columns:1fr}}