:root{--primary:#4f46e5;--primary-dark:#4338ca;--bg:#ffffff;--fg:#111827;--muted:#6b7280;--border:#e5e7eb;--card:#ffffff;--success:#16a34a;--danger:#dc2626;--radius:12px}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--fg)}a{color:inherit;text-decoration:none}.quiz-card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:transform .15s ease,box-shadow .15s ease}.quiz-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(17,24,39,.08)}.quiz-card__cover{width:100%;height:150px;object-fit:cover;background:linear-gradient(135deg,#eef2ff,#e0e7ff)}.quiz-card__body{padding:16px;display:flex;flex-direction:column;gap:8px;flex:1 1}.quiz-card__title{font-size:1.05rem;font-weight:700}.quiz-card__desc{color:var(--muted);font-size:.9rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.quiz-card__meta{margin-top:auto;display:flex;justify-content:space-between;align-items:center;padding-top:8px}.badge{background:#eef2ff;color:var(--primary-dark);padding:4px 10px;border-radius:999px;font-size:.78rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:10px;padding:10px 18px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:background .15s ease}.btn-primary{background:var(--primary);color:white}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:white;border-color:var(--border)}.catalog{max-width:1100px;margin:0 auto;padding:24px}.catalog h1{font-size:1.8rem}.filters{display:flex;gap:8px;margin:16px 0}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));grid-gap:20px;gap:20px}