/* ── Breadcrumbs ── */
.breadcrumbs {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
}

.breadcrumbs__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  font-size: var(--text-sm);
}

@media (min-width: 768px) { .breadcrumbs__inner { padding: 0 var(--space-2xl); } }
@media (min-width: 1400px) { .breadcrumbs__inner { padding: 0 var(--space-3xl); } }

.breadcrumbs__item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-muted);
}

.breadcrumbs__link {
  color: var(--color-ocean);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.breadcrumbs__link:hover { color: var(--color-tangerine); }

.breadcrumbs__sep {
  color: var(--color-border);
  user-select: none;
}

.breadcrumbs__current {
  color: var(--color-muted);
  font-weight: 500;
}

/* ── Task-list checkboxes ── */
.contains-task-list {
  list-style: none;
  padding-left: 0;
}

.contains-task-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.contains-task-list li:hover { background: var(--color-code-bg); }

.task-list-item-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  min-width: 18px;
  border: 2px solid var(--color-ocean);
  border-radius: 4px;
  background: var(--color-surface);
  cursor: pointer;
  position: relative;
  margin-top: 3px;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.task-list-item-checkbox:checked {
  background: var(--color-ocean);
  border-color: var(--color-ocean);
}

.task-list-item-checkbox:checked::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 12 10' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 5l3.5 3.5L11 1' stroke='%23fff' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/12px no-repeat;
}

.task-list-item-checkbox:focus-visible {
  outline: 2px solid var(--color-sky);
  outline-offset: 2px;
}

.task-list-item--checked {
  color: var(--color-muted);
  text-decoration: line-through;
  text-decoration-color: var(--color-muted);
}

/* ── Responsive tables ── */
.table-scroll {
  width: 100%;
  overflow-x: auto;
  margin: var(--space-lg) 0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  min-width: 480px;
}

.article-body table thead { background: var(--color-navy); }

.article-body table thead th {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  font-weight: 600;
  color: #fff;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.article-body table tbody tr:nth-child(even) {
  background: var(--color-code-bg);
}

.article-body table tbody tr:hover { background: #daeeff; }

.article-body table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
  line-height: 1.5;
}

/* ── FAQ / Accordions ── */
.faq-section { margin: var(--space-lg) 0; }

details.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

details.faq-item[open] {
  box-shadow: var(--shadow-sm);
  border-color: var(--color-ocean);
}

summary.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-navy);
  cursor: pointer;
  list-style: none;
  gap: var(--space-md);
  background: var(--color-surface);
  transition: background var(--transition-fast);
  user-select: none;
}

summary.faq-question::-webkit-details-marker { display: none; }

summary.faq-question:hover { background: var(--color-code-bg); }

details.faq-item[open] summary.faq-question {
  background: var(--color-code-bg);
  border-bottom: 1px solid var(--color-border);
}

.faq-question__icon {
  width: 20px;
  height: 20px;
  min-width: 20px;
  border-radius: 50%;
  background: var(--color-code-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--color-ocean);
  transition: transform var(--transition-base), background var(--transition-fast);
}

details.faq-item[open] .faq-question__icon {
  transform: rotate(180deg);
  background: var(--color-ocean);
  color: #fff;
}

.faq-answer {
  padding: var(--space-lg);
  background: var(--color-surface);
}

.faq-answer p:last-child { margin-bottom: 0; }

/* ── Section cards (homepage) ── */
.section-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  margin: var(--space-2xl) 0;
}

@media (min-width: 640px) { .section-cards { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1024px) { .section-cards { grid-template-columns: repeat(3, 1fr); } }

.section-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.section-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  color: inherit;
}

.section-card--fundamentals:hover { border-color: var(--color-ocean); }
.section-card--branching:hover { border-color: var(--color-tangerine); }
.section-card--conflict:hover { border-color: var(--color-sky); }

.section-card__icon {
  font-size: 2.5rem;
  line-height: 1;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

.section-card--fundamentals .section-card__icon { background: linear-gradient(135deg, #EDF4FF, #C8DCF5); }
.section-card--branching .section-card__icon { background: linear-gradient(135deg, #FFF3E8, #FDDCB8); }
.section-card--conflict .section-card__icon { background: linear-gradient(135deg, #E8F6FF, #BADEFC); }

.section-card__title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.3;
}

.section-card__desc {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.6;
  flex: 1;
  margin: 0;
}

.section-card__links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.section-card__links li { margin: 0; }

.section-card__links a {
  font-size: var(--text-sm);
  color: var(--color-ocean);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 0;
  transition: color var(--transition-fast);
}

.section-card__links a:hover { color: var(--color-tangerine); }
.section-card__links a::before { content: '›'; font-weight: 700; }

/* ── Home intro ── */
.home-intro {
  max-width: var(--max-width);
  margin: var(--space-3xl) auto 0;
  padding: 0 var(--space-lg);
}

@media (min-width: 768px) { .home-intro { padding: 0 var(--space-2xl); } }
@media (min-width: 1400px) { .home-intro { padding: 0 var(--space-3xl); } }

.home-intro__text {
  max-width: 800px;
  font-size: var(--text-lg);
  line-height: 1.75;
  color: var(--color-text);
}

.home-intro__text p { margin-bottom: var(--space-lg); }