.learning-main { width: min(100% - 80px, 1200px); padding-block: 24px 72px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 10px; color: var(--home-muted, var(--text-secondary)); font-size: .875rem; line-height: 1.6; }
.breadcrumbs > * + *::before { content: "/"; margin-right: 10px; color: var(--text-secondary); }
.breadcrumbs a { text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }
.learning-intro { max-width: 850px; padding-block: 56px 44px; }
.learning-intro h1 { max-width: 850px; font-size: clamp(2.25rem, 4.5vw, 3.6rem); line-height: 1.12; letter-spacing: -.045em; }
.learning-intro h1 span { color: var(--brand); }
.learning-intro .lead { max-width: 690px; margin-top: 24px; }
.learning-note { margin-top: 24px; color: var(--text-secondary); font-size: .875rem; }
.learning-section-heading { padding-block: 24px; border-top: 1px solid var(--outline); }
.learning-section-heading h2, .learning-featured h2, .learning-guide h2 { font-size: 1.65rem; letter-spacing: -.025em; }
.learning-section-heading p { margin-bottom: 0; color: var(--text-secondary); }
.level-links { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0 32px; }
.level-links a { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 24px; border-bottom: 1px solid var(--outline); text-decoration: none; font-size: 1.25rem; font-weight: 650; }
.level-links a:hover, .topic-link:hover h3 { color: var(--brand); }
.level-links span { color: var(--text-secondary); font-size: .875rem; font-weight: 400; white-space: nowrap; }
.learning-featured { margin-top: 64px; }
.topic-list { border-top: 1px solid var(--outline); }
.topic-link { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 32px; align-items: center; padding-block: 26px; border-bottom: 1px solid var(--outline); text-decoration: none; }
.topic-link h3 { margin: 0 0 7px; font-size: 1.2rem; line-height: 1.4; font-weight: 650; letter-spacing: -.015em; }
.topic-link div > span { color: var(--text-secondary); font-size: .9375rem; }
.topic-link p { max-width: 760px; margin: 10px 0 0; color: var(--text-secondary); font-size: .9375rem; }
.topic-action { display: inline-flex; align-items: center; gap: 12px; color: var(--brand); font-size: .875rem; white-space: nowrap; }
.topic-action svg { flex: none; }
.level-switch { display: flex; flex-wrap: wrap; gap: 8px 12px; margin-bottom: 32px; }
.level-switch a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 16px; border-radius: 6px; text-decoration: none; }
.level-switch a[aria-current="page"] { background: var(--ink); color: #fff; }
.level-switch a:not([aria-current]):hover { background: var(--surface-muted); }
.learning-guide { max-width: 820px; margin-top: 64px; }
.learning-guide ol { padding-left: 22px; }
.learning-guide li { padding: 8px 0 8px 6px; line-height: 1.7; }
.learning-guide p { color: var(--text-secondary); }
.home-page .home-practice { padding-block: 56px 64px; border-top: 1px solid var(--home-rule); }
.home-practice h2 { max-width: 700px; font-size: clamp(1.875rem, 3.2vw, 2.75rem); letter-spacing: -.04em; }
.home-practice p { max-width: 660px; color: var(--text-secondary); }
.home-practice > a { display: inline-flex; align-items: center; min-height: 44px; margin-top: 24px; color: var(--brand); font-weight: 600; }
@media (max-width: 960px) { .level-links { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 760px) {
  .learning-main { width: calc(100% - 40px); padding-top: 16px; }
  .learning-intro { padding-block: 36px 28px; }
  .learning-intro h1 { font-size: clamp(2rem, 7vw, 2.75rem); }
  .level-links { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 24px; }
  .level-links a { font-size: 1.125rem; gap: 8px; }
  .level-links span { font-size: .8125rem; }
  .topic-link { grid-template-columns: minmax(0, 1fr); gap: 16px; padding-block: 24px; }
  .learning-featured, .learning-guide { margin-top: 44px; }
  .home-page .home-practice { padding-block: 40px 44px; }
}