/* Blog index layout */
.iframe-container {
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.iframe-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.blog-index {
  max-width: var(--max-width-container);
  margin: 2rem auto;
  padding: 0 1.5rem;
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.blog-header {
  text-align: center;
  margin: 2rem auto;
  max-width: 800px;
}

.blog-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.blog-header p {
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

main {
  padding-top: 75px;
}

.sidebar {
  flex: 0 0 240px;
  font-size: 0.9rem;
  line-height: 1.3;
}

.sidebar details {
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: .5rem;
}

.sidebar summary {
  font-weight: bold;
  cursor: pointer;
  list-style: none;
  position: relative;
  font-size: 0.95rem;
  line-height: 1.3;
  padding: 0.25rem 0;
}

.sidebar summary::after {
  content: '▶';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  transition: transform 0.2s ease;
}

.sidebar ul {
  margin: 0.5rem 0 0 1.25rem;
  padding: 0;
  list-style: disc;
}

.sidebar summary::-webkit-details-marker,
.sidebar summary::marker {
  display: none;
}

.sidebar details[open] summary::after {
  transform: translateY(-50%) rotate(90deg);
}

.sidebar h2 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.sidebar details {
  margin-bottom: 0.75rem;
}

.sidebar ul li {
  font-size: 0.9rem;
  line-height: 1.3;
  margin-bottom: 0.25rem;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 240px);
  justify-content: center;
  gap: 1.5rem;
  margin: 0 auto;
}

.grid-card {
  width: 220px;
  box-sizing: border-box;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.grid-card:hover {
  box-shadow: var(--shadow-lg);
}

.grid-card img {
  width: 100%;
  display: block;
}

.grid-card h3 {
  margin: .75rem 1rem .25rem;
  font-size: 1.1rem;
  color: var(--color-primary);
}

.grid-card time {
  display: block;
  margin: 0 1rem 1rem;
  font-size: .85rem;
  color: var(--color-text-muted);
}

.post-grid h3 a {
  color: var(--color-primary);
  text-decoration: none;
}

.post-grid h3 a:hover {
  text-decoration: underline;
}

@media (max-width: 1000px) {
  .post-grid {
    grid-template-columns: repeat(2, 240px);
  }
}

@media (max-width: 800px) {
  .blog-index {
    flex-direction: column;
  }

  .post-grid,
  .sidebar {
    flex: none;
    width: 100%;
    max-width: none;
    margin: 0 auto;
  }

  .sidebar {
    margin-bottom: 2rem;
  }

  .post-grid {
    order: 1;
  }

  .sidebar {
    order: 2;
  }
}