.chapter03-learning-guide{
 margin:20px 0 24px;padding:18px 20px;border-radius:24px;
 background:linear-gradient(145deg,rgba(244,251,248,.95),rgba(255,253,248,.95));
 border:1px solid rgba(92,128,119,.12);box-shadow:0 12px 34px rgba(63,96,88,.045)
}
.chapter03-learning-guide small{font-size:10px;letter-spacing:.18em;font-weight:800;color:#78a49b}
.chapter03-learning-guide h3{margin:4px 0 10px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:19px;font-weight:500;color:#35564f}
.chapter03-learning-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.chapter03-learning-steps div{padding:11px 12px;border-radius:15px;background:rgba(255,255,253,.86);border:1px solid #e1ebe8;color:#657a75;font-size:12px;line-height:1.6}
.chapter03-learning-steps b{display:block;margin-bottom:2px;color:#579087;font-size:11px}
.back-to-toc{display:flex;justify-content:flex-end;margin:8px 3px 24px}
.back-to-toc a{padding:7px 12px;border-radius:999px;text-decoration:none;background:#f0f7f4;border:1px solid #dce9e5;color:#64867f;font-size:11px;font-weight:700}
.net-toc-card span:last-child{transition:.2s}.net-toc-card:hover span:last-child{transform:translateX(2px)}
@media(max-width:700px){.chapter03-learning-steps{grid-template-columns:1fr}.chapter03-learning-guide{padding:15px}}