/* Learn section */
.learn-wrap { max-width: 900px; margin: 0 auto; padding: 40px 24px 80px; }
.learn-hero { margin-bottom: 36px; }
.learn-hero h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0 0 10px; }
.learn-hero p { color: var(--text-2); line-height: 1.55; margin: 0; }
.learn-path { display: flex; flex-direction: column; gap: 10px; margin: 24px 0; }
.learn-lesson-link {
  display: flex; align-items: center; gap: 16px; padding: 16px 18px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  text-decoration: none; color: inherit; transition: border-color .15s, box-shadow .15s;
}
.learn-lesson-link:hover { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-50); }
.learn-lesson-link .num { width: 36px; height: 36px; border-radius: 10px; background: var(--brand-50); color: var(--brand-700); font-weight: 800; display: grid; place-items: center; flex: none; }
.learn-lesson-link.done .num { background: var(--success-bg); color: var(--success); }
.learn-lesson-link b { display: block; font-size: 1rem; }
.learn-lesson-link span { font-size: .85rem; color: var(--text-2); }
.learn-tracks { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin-top: 32px; }
.learn-track { padding: 16px; background: var(--bg-2); border-radius: 12px; border: 1px solid var(--border); }
.learn-track h3 { font-size: .95rem; margin: 0 0 8px; }
.learn-track p { font-size: .82rem; color: var(--text-2); margin: 0; line-height: 1.45; }
.lesson-why { color: var(--brand-700); font-weight: 700; font-size: .92rem; margin-bottom: 20px; padding: 12px 16px; background: var(--brand-50); border-radius: 10px; border-left: 4px solid var(--brand); }
.lesson-body { line-height: 1.65; color: var(--text); }
.lesson-body h2 { font-size: 1.35rem; margin: 28px 0 12px; }
.lesson-body p { margin: 0 0 14px; color: var(--text-2); }
.lesson-diagram { background: var(--bg-2); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin: 20px 0; font-size: .9rem; }
.lesson-quiz { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--border); }
.lesson-quiz h3 { margin: 0 0 16px; }
.quiz-q { margin-bottom: 18px; }
.quiz-q label { display: block; font-weight: 600; margin-bottom: 8px; }
.quiz-q select, .quiz-q input { width: 100%; max-width: 400px; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border-strong); font-family: inherit; }
.lesson-nav { display: flex; justify-content: space-between; margin-top: 32px; gap: 12px; flex-wrap: wrap; }
.term { border-bottom: 1px dotted var(--brand); cursor: help; }
.glossary-list dt { font-weight: 700; margin-top: 14px; }
.glossary-list dd { margin: 4px 0 0; color: var(--text-2); }