* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background: #f5f5f5;
}

.container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 320px;
  background: #fff;
  border-right: 1px solid #e0e0e0;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  overflow-y: auto;
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid #e0e0e0;
  background: #2c3e50;
  color: #fff;
}

.sidebar-header h1 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.sidebar-header p {
  font-size: 0.875rem;
  opacity: 0.8;
}

.search-box {
  padding: 1rem;
  border-bottom: 1px solid #e0e0e0;
}

.search-box input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 0.875rem;
}

.search-box input:focus {
  outline: none;
  border-color: #3498db;
}

.filters {
  padding: 1rem;
  border-bottom: 1px solid #e0e0e0;
}

.filter-group {
  margin-bottom: 1rem;
}

.filter-group:last-child {
  margin-bottom: 0;
}

.filter-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: #666;
  margin-bottom: 0.5rem;
}

.filter-group select {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 0.875rem;
  background: #fff;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  padding: 0.25rem 0.5rem;
  background: #e8e8e8;
  border: none;
  border-radius: 3px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: background 0.2s;
}

.tag:hover {
  background: #d0d0d0;
}

.tag.active {
  background: #3498db;
  color: #fff;
}

.skills-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0;
}

.skill-item {
  display: block;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #f0f0f0;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s;
}

.skill-item:hover {
  background: #f8f8f8;
}

.skill-item.active {
  background: #e8f4fc;
  border-left: 3px solid #3498db;
}

.skill-item h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.skill-item p {
  font-size: 0.8rem;
  color: #666;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.skill-item .meta {
  font-size: 0.7rem;
  color: #999;
  margin-top: 0.25rem;
}

.loading {
  padding: 1rem;
  color: #666;
  text-align: center;
}

/* Content */
.content {
  flex: 1;
  margin-left: 320px;
  padding: 2rem 3rem;
  max-width: 900px;
}

.welcome {
  text-align: center;
  padding: 4rem 2rem;
  color: #666;
}

.welcome h2 {
  color: #333;
  margin-bottom: 1rem;
}

/* Markdown Content Styling */
.markdown-body {
  line-height: 1.7;
}

.markdown-body h1 {
  font-size: 2rem;
  border-bottom: 2px solid #e0e0e0;
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

.markdown-body h2 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: #2c3e50;
}

.markdown-body h3 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.markdown-body p {
  margin-bottom: 1rem;
}

.markdown-body ul, .markdown-body ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.markdown-body li {
  margin-bottom: 0.5rem;
}

.markdown-body code {
  font-family: "SF Mono", Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.875rem;
  background: #f4f4f4;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
}

.markdown-body pre {
  background: #2d2d2d;
  color: #f8f8f2;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 1rem;
}

.markdown-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.markdown-body blockquote {
  border-left: 4px solid #3498db;
  padding-left: 1rem;
  margin: 1rem 0;
  color: #666;
}

.markdown-body a {
  color: #3498db;
  text-decoration: none;
}

.markdown-body a:hover {
  text-decoration: underline;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}

.markdown-body th, .markdown-body td {
  border: 1px solid #ddd;
  padding: 0.5rem;
  text-align: left;
}

.markdown-body th {
  background: #f4f4f4;
}

.markdown-body hr {
  border: none;
  border-top: 1px solid #e0e0e0;
  margin: 2rem 0;
}

/* Skill Metadata Header */
.skill-meta {
  background: #f8f9fa;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.skill-meta-row {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.skill-meta-item {
  font-size: 0.875rem;
}

.skill-meta-item strong {
  color: #666;
}

.skill-meta-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.skill-meta-tag {
  background: #e8e8e8;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-size: 0.75rem;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    position: relative;
    border-right: none;
    border-bottom: 1px solid #e0e0e0;
  }

  .content {
    margin-left: 0;
    padding: 1rem;
  }

  .container {
    flex-direction: column;
  }
}