.learn-breadcrumb {
  margin: 0 0 1rem;
  font-size: 0.8125rem;
  color: #64748b;
}

.learn-breadcrumb a {
  color: #475569;
  text-decoration: none;
  font-weight: 600;
}

.learn-breadcrumb a:hover,
.learn-breadcrumb a:focus-visible {
  color: #1d4ed8;
  text-decoration: underline;
}

.learn-roadmap {
  display: grid;
  gap: 1rem;
}

.learn-roadmap__group {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 1rem 1.15rem;
}

.learn-roadmap__group h2 {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 800;
  color: #1d4ed8;
}

.learn-roadmap__purpose {
  margin: 0.3rem 0 0.75rem;
  color: #64748b;
  font-size: 0.875rem;
  line-height: 1.55;
}

.learn-roadmap__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.learn-roadmap__list li + li {
  margin-top: 0.35rem;
}

.learn-roadmap__list a {
  color: #1d4ed8;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.9375rem;
}

.learn-roadmap__list a:hover,
.learn-roadmap__list a:focus-visible {
  text-decoration: underline;
}

.learn-roadmap__list .is-soon {
  color: #94a3b8;
  font-weight: 500;
}

.learn-roadmap__badge {
  margin-left: 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0;
}

.learn-frame {
  margin: 0 0 1.25rem;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 1rem 1.15rem 1.1rem;
}

.learn-frame h2 {
  margin: 0 0 0.65rem;
  font-size: 1.0625rem;
  font-weight: 800;
  color: #1d4ed8;
}

.learn-frame ol {
  margin: 0;
  padding-left: 1.25rem;
  color: #334155;
  line-height: 1.7;
}

.learn-frame p {
  margin: 0.75rem 0 0;
  color: #64748b;
  font-size: 0.875rem;
  line-height: 1.6;
}

.learn-chapter {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.06);
  padding: 1.5rem;
}

.learn-chapter__step {
  margin: 0 0 1.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #e2e8f0;
}

.learn-chapter__step:last-of-type {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.learn-chapter__label {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #2563eb;
}

.learn-chapter__step h2 {
  margin: 0 0 0.75rem;
  font-size: 1.3125rem;
  font-weight: 800;
  color: #1d4ed8;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.learn-chapter__step p,
.learn-chapter__step li {
  margin: 0.45rem 0 0;
  color: #334155;
  line-height: 1.7;
}

.learn-chapter__step ul {
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
}

.learn-caution {
  margin-top: 1.25rem;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  border: 1px solid #fcd34d;
  background: #fffbeb;
}

.learn-caution__title {
  margin: 0 0 0.35rem;
  font-size: 0.8125rem;
  font-weight: 700;
  color: #92400e;
}

.learn-caution p {
  margin: 0;
  font-size: 0.9375rem;
  color: #78350f;
  line-height: 1.6;
}

.learn-more {
  margin-top: 1rem;
  border-top: 1px solid #e2e8f0;
  padding-top: 1rem;
}

.learn-more summary {
  cursor: pointer;
  font-weight: 600;
  color: #475569;
  font-size: 0.9375rem;
}

.learn-more__body {
  margin-top: 0.65rem;
  color: #475569;
  font-size: 0.9375rem;
  line-height: 1.65;
}

.learn-macro-cta {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid #e2e8f0;
}

.learn-macro-cta a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 700;
  color: #1d4ed8;
  text-decoration: none;
  font-size: 0.9375rem;
}

.learn-macro-cta a:hover,
.learn-macro-cta a:focus-visible {
  text-decoration: underline;
}

.learn-chapter-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
  font-size: 0.875rem;
}

.learn-chapter-nav a {
  color: #475569;
  font-weight: 600;
  text-decoration: none;
}

.learn-chapter-nav a:hover,
.learn-chapter-nav a:focus-visible {
  color: #1d4ed8;
  text-decoration: underline;
}

.learn-gateway-link {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
}

.learn-gateway-link a {
  color: #64748b;
  text-decoration: none;
}

.learn-gateway-link a:hover {
  color: #1d4ed8;
  text-decoration: underline;
}

.learn-diagram {
  margin: 0.75rem 0 0;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  background: #f8fafc;
  font-family: ui-monospace, "Cascadia Code", "Segoe UI Mono", monospace;
  font-size: 0.75rem;
  line-height: 1.55;
  color: #334155;
  overflow-x: auto;
  white-space: pre;
}

.learn-more__body h3 {
  margin: 1rem 0 0.35rem;
  font-size: 0.875rem;
  color: #0f172a;
}

.learn-more__body h3:first-child {
  margin-top: 0;
}

.learn-more__body .learn-diagram {
  font-size: 0.6875rem;
}

.learn-data {
  margin: 0.85rem 0 0;
  max-height: 280px;
  overflow: auto;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #fff;
}

.learn-data table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.learn-data th,
.learn-data td {
  padding: 0.28rem 0.55rem;
  border-bottom: 1px solid #e2e8f0;
  text-align: right;
  color: #334155;
}

.learn-data th:nth-child(2),
.learn-data td:nth-child(2) {
  text-align: left;
}

.learn-data th {
  position: sticky;
  top: 0;
  background: #f8fafc;
  font-weight: 700;
}

.learn-data tr.is-outlier td {
  background: #fff7ed;
  color: #9a3412;
  font-weight: 700;
}

.learn-chart {
  margin: 0.85rem 0 0;
  padding: 0.75rem;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  background: #f8fafc;
}

.learn-chart svg {
  display: block;
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  height: auto;
}

.learn-chart__caption {
  margin: 0.5rem 0 0;
  font-size: 0.8125rem;
  color: #64748b;
  text-align: center;
  line-height: 1.5;
}

.learn-capture {
  margin: 0.85rem 0 0;
  padding: 0;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  background: #f8fafc;
  overflow: hidden;
}

.learn-capture img {
  display: block;
  width: 100%;
  height: auto;
}

.learn-capture__caption {
  margin: 0;
  padding: 0.65rem 0.85rem;
  font-size: 0.8125rem;
  color: #64748b;
  line-height: 1.5;
  border-top: 1px solid #e2e8f0;
  background: #fff;
}

.learn-macro-mock {
  font-size: 0.75rem;
  line-height: 1.45;
  color: #e2e8f0;
  background: #0f172a;
}

.learn-macro-mock__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  padding: 0.5rem 0.65rem;
  background: #1e293b;
  border-bottom: 1px solid #334155;
  font-size: 0.6875rem;
  color: #94a3b8;
}

.learn-macro-mock__bar strong {
  color: #f8fafc;
  font-weight: 600;
}

.learn-macro-mock__body {
  padding: 0.65rem;
}

.learn-macro-mock table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.6875rem;
}

.learn-macro-mock th,
.learn-macro-mock td {
  padding: 0.35rem 0.45rem;
  border: 1px solid #334155;
  text-align: right;
}

.learn-macro-mock th:first-child,
.learn-macro-mock td:first-child,
.learn-macro-mock th:nth-child(2),
.learn-macro-mock td:nth-child(2) {
  text-align: left;
}

.learn-macro-mock th {
  background: #1e293b;
  color: #cbd5e1;
  font-weight: 600;
}

.learn-macro-mock td {
  background: #0f172a;
  color: #e2e8f0;
  font-variant-numeric: tabular-nums;
}

.learn-macro-mock .is-highlight {
  background: #172554;
  color: #93c5fd;
}

.learn-macro-mock__card {
  border: 1px solid #4338ca;
  border-radius: 8px;
  background: rgba(30, 27, 75, 0.35);
  padding: 0.55rem 0.65rem;
}

.learn-macro-mock__card-title {
  font-weight: 700;
  color: #c7d2fe;
  margin-bottom: 0.35rem;
}

.learn-macro-mock__card-row {
  border: 1px solid #312e81;
  border-radius: 6px;
  background: rgba(15, 23, 42, 0.8);
  padding: 0.45rem 0.55rem;
  margin-top: 0.35rem;
}

.learn-macro-mock__card-row strong {
  color: #f8fafc;
}

.learn-macro-mock__card-metrics {
  margin-top: 0.2rem;
  color: #94a3b8;
  font-size: 0.625rem;
}

.learn-macro-mock__help {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 0.95rem;
  height: 0.95rem;
  margin-left: 0.15rem;
  border-radius: 999px;
  border: 1px solid #6366f1;
  color: #a5b4fc;
  font-size: 0.625rem;
  font-weight: 700;
  vertical-align: middle;
}

.learn-draft-note {
  margin: 0 0 1rem;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  font-size: 0.8125rem;
  color: #1e40af;
  line-height: 1.5;
}

/* —— 오른쪽 목차. 제목 아래, 본문 카드와 같은 높이에서 시작 —— */
.page.learn-stats--with-sidebar {
  max-width: 1180px;
}

.learn-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(200px, 240px);
  gap: 1.5rem;
  align-items: start;
}

.learn-main {
  min-width: 0;
}

.learn-toc__inner {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
  padding: 0.85rem 0.9rem;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.learn-toc__home {
  display: block;
  margin-bottom: 0.75rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid #e2e8f0;
  font-size: 0.75rem;
  font-weight: 600;
  color: #64748b;
  text-decoration: none;
}

.learn-toc__home:hover,
.learn-toc__home:focus-visible {
  color: #1d4ed8;
}

.learn-toc__heading {
  margin: 0 0 0.45rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #94a3b8;
}

.learn-toc__heading--sections {
  margin-top: 0.85rem;
  padding-top: 0.75rem;
  border-top: 1px solid #e2e8f0;
  color: #2563eb;
}

.learn-toc__group + .learn-toc__group {
  margin-top: 0.55rem;
}

.learn-toc__group-title {
  margin: 0 0 0.2rem;
  font-size: 0.6875rem;
  font-weight: 600;
  color: #94a3b8;
}

.learn-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.learn-toc__list li + li {
  margin-top: 0.1rem;
}

.learn-toc__list a {
  display: block;
  padding: 0.2rem 0.35rem;
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: #475569;
  text-decoration: none;
  line-height: 1.4;
}

.learn-toc__list a:hover,
.learn-toc__list a:focus-visible {
  color: #1d4ed8;
  background: #eff6ff;
}

.learn-toc__list a.is-current-chapter {
  color: #1d4ed8;
  font-weight: 700;
  background: #eff6ff;
}

.learn-toc__list .is-soon {
  display: block;
  padding: 0.2rem 0.35rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: #94a3b8;
  line-height: 1.4;
}

.learn-toc__list--sections a {
  font-size: 0.75rem;
  padding-left: 0.5rem;
  border-left: 2px solid transparent;
}

.learn-toc__list--sections a.is-active {
  color: #1d4ed8;
  font-weight: 700;
  border-left-color: #1d4ed8;
  background: #f8fafc;
}

.learn-chapter__step,
.learn-caution,
.learn-more,
.learn-macro-cta {
  scroll-margin-top: 1.25rem;
}

@media (max-width: 899px) {
  .learn-layout {
    grid-template-columns: 1fr;
  }

  .learn-toc {
    order: -1;
  }

  .learn-toc__inner {
    position: static;
    max-height: none;
    margin-bottom: 0.25rem;
  }
}

/* Expanded textbook chapter and desktop section navigation. */
.learn-toc { position: sticky; top: 1rem; }
.learn-toc__inner { position: static; }
.learn-toc__heading--sections { margin-top: 0; padding-top: 0; border-top: 0; }
.learn-course-details { margin-top: 1rem; border-top: 1px solid #e2e8f0; padding-top: .8rem; }
.learn-course-details summary { cursor: pointer; font-weight: 700; color: #334155; padding: .35rem 0; }
.learn-course-details .learn-toc__heading { margin-top: .8rem; }
.learn-nav-note, .learn-source-note { font-size: .875rem; line-height: 1.65; color: #64748b; }
.learn-start { display: inline-block; margin-top: 1rem; color: #1d4ed8; font-weight: 700; }
.learn-chapter-nav a { max-width: 48%; line-height: 1.6; }
.learn-chapter-nav a:last-child { text-align: right; }
.learn-chapter--expanded { padding: 2rem; box-shadow: none; }
.learn-chapter--expanded p { line-height: 1.85; word-break: keep-all; overflow-wrap: anywhere; }
.learn-chapter--expanded .learn-chapter__step { margin-bottom: 2rem; padding-bottom: 2rem; }
.learn-chart--wide { padding: 1rem; margin: 1.25rem 0; }
.learn-chart--wide svg { max-width: 680px; }
.learn-chart--wide svg text { font-size: 14px; fill: #334155; font-family: inherit; }
.learn-chart--wide .learn-chart__caption { text-align: left; line-height: 1.65; }
.learn-data--full { max-height: none; }
.learn-data--full th, .learn-data--full td { text-align: left; padding: .65rem; position: static; }
.learn-data caption { padding: .65rem; text-align: left; color: #475569; font-weight: 600; }
.learn-exercises { padding-left: 1.35rem; }
.learn-exercises > li { padding: .8rem 0; }
.learn-exercises details { margin-top: .5rem; padding: .7rem 1rem; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 6px; }
.learn-exercises summary { cursor: pointer; font-weight: 600; color: #1d4ed8; }
.learn-chapter--expanded a:focus-visible, .learn-toc a:focus-visible, summary:focus-visible { outline: 2px solid #2563eb; outline-offset: 3px; }
@media (max-width: 899px) { .learn-toc { position: static; } }