:root {
  --theme-color: #2563eb;
  --theme-color-light: #dbeafe;
  --theme-color-dark: #1d4ed8;
  --base-background-color: #f8fafc;
  --sidebar-width: 296px;
  --content-max-width: 960px;
  --text-color: #0f172a;
  --text-color-secondary: #475569;
  --border-color: #e2e8f0;
  --mobile-header-height: 96px;
}

body {
  background: #f8fafc;
  color: var(--text-color);
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background: rgba(248, 250, 252, 0.96);
  backdrop-filter: blur(10px);
}

.site-brand {
  color: var(--text-color);
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  position: static;
  margin: 0;
}

.site-nav a {
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  color: var(--text-color-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
}

.site-nav a:hover,
.sidebar ul li a:hover,
.app-nav a:hover {
  color: var(--theme-color-dark);
}

.sidebar,
.markdown-section code,
.markdown-section pre,
.search input {
  border-color: var(--border-color);
}

.sidebar {
  top: 61px;
  padding-top: 1rem;
  background: #fff;
}

.sidebar-toggle {
  background: var(--theme-color);
}

.content {
  padding-top: 2rem;
}

.markdown-section {
  max-width: var(--content-max-width);
  padding: 0 2rem 3rem;
}

.markdown-section h1,
.markdown-section h2,
.markdown-section h3 {
  color: var(--text-color);
}

.markdown-section h1 {
  margin-top: 0;
  font-size: 2.4rem;
}

.markdown-section h2 {
  margin-top: 2.5rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border-color);
}

.markdown-section blockquote {
  border-left: 4px solid var(--theme-color);
  background: #eff6ff;
  color: var(--text-color-secondary);
}

.markdown-section pre {
  border-radius: 12px;
}

.markdown-section code {
  border-radius: 6px;
}

.app-name-link,
.sidebar ul li.active > a {
  color: var(--theme-color);
  font-weight: 700;
}

.search {
  margin-bottom: 1rem;
  padding: 0 1rem;
}

.search input {
  border-radius: 10px;
}

@media (max-width: 768px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.75rem 1rem;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .site-nav a {
    flex: 0 0 auto;
  }

  .sidebar {
    top: var(--mobile-header-height);
    height: calc(100vh - var(--mobile-header-height));
  }

  .markdown-section {
    padding: 0 1rem 2.5rem;
  }
}