body { display: flex; flex-direction: column; background-color: #f7f9fb; }
.c-container { display: flex; flex: 1; max-width: 100%; }
.c-sidebar {
  width: 240px;
  background: #f5f5f5;
  padding: 1.5rem;
  border-right: 1px solid #ddd;
  position: sticky;
  top: 0;
  height: fit-content;
  max-height: 100vh;
  overflow-y: auto;
}
.c-sidebar h3 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #666;
  margin: 0 0 1rem 0;
  letter-spacing: 0.05em;
}
.c-sidebar ul { list-style: none; padding: 0; margin: 0; }
.c-sidebar li { margin: 0.3rem 0; }
.c-sidebar a {
  color: #0066cc;
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.3rem 0.5rem;
  display: block;
  border-radius: 4px;
  transition: background 0.15s;
}
.c-sidebar a:hover { background: #e0e0e0; }
.c-sidebar a.active { background: #CE422B; color: white; }
.c-content { flex: 1; padding: 2rem; max-width: 900px; }
.breadcrumb { font-size: 0.9rem; color: #666; margin-bottom: 1rem; }
.breadcrumb a { color: #0066cc; text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
h1 { font-size: 2.5rem; margin-top: 0; margin-bottom: 0.5rem; }
.intro-text { font-size: 1.1rem; color: #555; margin-bottom: 2rem; }
.progress-bar { background: #f0f0f0; border-radius: 8px; height: 8px; margin: 2rem 0; overflow: hidden; }
.progress-fill { background: linear-gradient(90deg, #CE422B, #8B2E20); height: 100%; width: 0%; transition: width 0.3s ease; }
.progress-text { font-size: 0.9rem; color: #666; margin-top: 0.3rem; }
h2 { font-size: 1.8rem; margin-top: 2.5rem; margin-bottom: 1rem; border-bottom: 2px solid #CE422B; padding-bottom: 0.5rem; }
h3 { font-size: 1.2rem; margin-top: 1.5rem; margin-bottom: 0.8rem; }
.why-learn-list { list-style: none; padding: 0; margin: 1rem 0; }
.why-learn-list li { padding: 0.8rem 1rem; margin: 0.5rem 0; background: #f9f9f9; border-left: 4px solid #CE422B; }
.learning-path { display: flex; flex-wrap: wrap; gap: 1rem; margin: 1.5rem 0; align-items: center; }
.path-step { background: #CE422B; color: #fff; padding: 1rem 1.5rem; border-radius: 8px; flex: 0 1 auto; text-align: center; font-weight: 600; font-size: 0.95rem; }
.path-arrow { font-size: 1.5rem; color: #CE422B; }
@media (max-width: 768px) {
  .learning-path { flex-direction: column; }
  .path-arrow { transform: rotate(90deg); }
}
details { margin: 1.5rem 0; border: 1px solid #ddd; border-radius: 8px; padding: 0; background: #fafafa; }
details[open] { padding: 1rem; }
summary { padding: 1rem; cursor: pointer; font-weight: 600; font-size: 1.05rem; user-select: none; display: flex; justify-content: space-between; align-items: center; }
summary:hover { background: #f0f0f0; }
details[open] summary { border-bottom: 1px solid #ddd; margin-bottom: 1rem; padding-bottom: 1rem; }
.lesson-content { margin-top: 0; }
pre[class*="language-"] { background: #1e1e1e !important; border-radius: 6px; margin: 1rem 0; }
.try-it-btn { display: inline-block; background: #CE422B; color: #fff; padding: 0.6rem 1.2rem; border-radius: 6px; text-decoration: none; font-weight: 600; margin: 1rem 0; transition: background 0.2s; border: none; cursor: pointer; font-size: 0.95rem; }
.try-it-btn:hover { background: #8B2E20; }
.completion-checkbox { display: flex; align-items: center; gap: 0.8rem; margin-top: 1rem; padding: 0.8rem; background: #fff5f3; border-radius: 6px; }
.completion-checkbox input[type="checkbox"] { width: 18px; height: 18px; cursor: pointer; accent-color: #CE422B; }
.projects-list { list-style: none; padding: 0; margin: 1.5rem 0; }
.project-item { background: #f9f9f9; padding: 1.5rem; margin: 1rem 0; border-radius: 8px; border-left: 4px solid #CE422B; }
.project-title { font-weight: 700; font-size: 1.1rem; margin-bottom: 0.5rem; }
.project-meta { font-size: 0.9rem; color: #666; margin-bottom: 0.8rem; }
.project-meta span { margin-right: 1.5rem; }
.project-concepts { font-size: 0.95rem; margin-top: 0.8rem; color: #555; }
.resources-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin: 1.5rem 0; }
.resource-card { background: #f9f9f9; padding: 1.5rem; border-radius: 8px; border: 1px solid #ddd; }
.resource-card h4 { margin-top: 0; margin-bottom: 1rem; color: #333; }
.resource-card ul { list-style: none; padding: 0; margin: 0; }
.resource-card li { margin: 0.5rem 0; font-size: 0.95rem; }
.resource-card a { color: #CE422B; text-decoration: none; }
.resource-card a:hover { text-decoration: underline; }
.repos-section { margin: 3rem 0; }
.repos-controls { display: flex; flex-direction: column; gap: 1.5rem; margin-bottom: 2rem; }
.repos-search { display: flex; gap: 1rem; }
.repos-search input { flex: 1; padding: 0.8rem 1rem; border: 1px solid #ddd; border-radius: 6px; font-size: 1rem; font-family: inherit; }
.repos-search input:focus { outline: none; border-color: #CE422B; box-shadow: 0 0 0 3px rgba(206, 66, 43, 0.1); }
.repos-filters { display: flex; flex-wrap: wrap; gap: 0.8rem; }
.filter-btn { padding: 0.6rem 1.2rem; border: 2px solid #ddd; background: white; border-radius: 20px; cursor: pointer; font-weight: 600; font-size: 0.95rem; transition: all 0.2s; }
.filter-btn:hover { border-color: #CE422B; color: #CE422B; }
.filter-btn.active { background: #CE422B; color: white; border-color: #CE422B; }
.repos-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(450px, 100%), 1fr)); gap: 1.5rem; margin: 2rem 0; }
.repo-card { background: #fafafa; border: 1px solid #ddd; border-radius: 8px; padding: 1.5rem; transition: all 0.2s; }
.repo-card:hover { border-color: #CE422B; box-shadow: 0 4px 12px rgba(206, 66, 43, 0.15); transform: translateY(-2px); }
.repo-header { display: flex; justify-content: space-between; align-items: start; margin-bottom: 1rem; gap: 1rem; }
.repo-name { flex: 1; margin: 0; font-size: 1.1rem; }
.repo-name a { color: #CE422B; text-decoration: none; font-weight: 600; }
.repo-name a:hover { text-decoration: underline; }
.repo-stars { white-space: nowrap; font-weight: 600; color: #666; font-size: 0.95rem; }
.repo-meta { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-bottom: 1rem; align-items: center; }
.category-badge { display: inline-block; padding: 0.3rem 0.8rem; border-radius: 12px; font-size: 0.8rem; font-weight: 600; text-transform: uppercase; }
.category-badge.learning { background: #dbeafe; color: #1e40af; }
.category-badge.patterns { background: #ede9fe; color: #6d28d9; }
.category-badge.project { background: #dcfce7; color: #15803d; }
.category-badge.tool { background: #fed7aa; color: #92400e; }
.activity-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin: 0 0.3rem; }
.activity-dot.active { background: #22c55e; }
.activity-dot.recent { background: #eab308; }
.activity-dot.stale { background: #999; }
.last-commit { font-size: 0.85rem; color: #666; }
.license-badge { display: inline-block; padding: 0.2rem 0.6rem; background: #f0f0f0; border-radius: 4px; font-size: 0.8rem; color: #555; font-weight: 600; }
.repo-topics { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
.topic-tag { display: inline-block; padding: 0.3rem 0.6rem; background: #e8e8e8; color: #555; border-radius: 4px; font-size: 0.8rem; }
.repo-rationale { margin: 1rem 0; font-size: 0.95rem; color: #555; line-height: 1.5; }
.repo-link { display: inline-block; margin-top: 1rem; padding: 0.6rem 1.2rem; background: #CE422B; color: #fff; text-decoration: none; border-radius: 6px; font-weight: 600; font-size: 0.95rem; transition: background 0.2s; }
.repo-link:hover { background: #8B2E20; }
.repos-loading { text-align: center; padding: 2rem; color: #666; }
.repos-error { padding: 1.5rem; background: #fee2e2; border: 1px solid #fecaca; border-radius: 6px; color: #991b1b; margin-bottom: 2rem; }
.repos-empty { text-align: center; padding: 2rem; color: #666; font-style: italic; }
@media (max-width: 768px) {
  .repos-grid { grid-template-columns: 1fr; }
  .repos-filters { flex-direction: column; }
  .filter-btn { width: 100%; text-align: center; }
  .repo-header { flex-direction: column; }
  .repo-stars { align-self: flex-start; }
}
@media (max-width: 900px) {
  .c-container { flex-direction: column; }
  .c-sidebar { width: 100%; position: static; border-right: none; border-bottom: 1px solid #ddd; max-height: none; }
  .c-content { padding: 1.5rem; }
}