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

body {
  background-color: #B0E7FC;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: 'DM Sans', 'Noto Sans JP', sans-serif;
  position: relative;
  overflow-x: hidden;
}

/* Header */
header {
  width: 100%;
  max-width: 800px;
  padding: 2rem;
  animation: fadeInUp 1s ease-out;
  position: relative;
}

.header-avatar {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #4A4B4A;
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  transition: all 0.3s ease;
  background: rgba(255, 255, 255, 0.3);
}

.back-link:hover {
  background: #FDF4CD;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Main content */
main {
  width: 100%;
  max-width: 800px;
  padding: 0 2rem 4rem;
  z-index: 1;
  animation: fadeInUp 1s ease-out 0.2s both;
}

/* Article */
article {
  background: rgba(255, 255, 255, 0.8);
  border-radius: 1rem;
  padding: 3rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.article-header {
  margin-bottom: 2rem;
  padding: 0 0 1.5rem 0;
  border-bottom: 1px solid rgba(74, 75, 74, 0.1);
  max-width: none;
  width: auto;
  animation: none;
}

.article-title {
  font-size: 1.75rem;
  font-weight: 600;
  color: #4A4B4A;
  line-height: 1.4;
  margin-top: 1.0rem;
  margin-bottom: 2.25rem;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.article-meta {
  font-size: 0.9rem;
  color: #4A4B4A;
  opacity: 0.6;
}

/* Share links */
.share-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.share-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: #4A4B4A;
  text-decoration: none;
  transition: all 0.3s ease;
  background: rgba(255, 255, 255, 0.5);
  border: none;
  cursor: pointer;
}

.share-icon:hover {
  background: #FDF4CD;
  transform: scale(1.1);
}

.share-icon svg {
  width: 18px;
  height: 18px;
}

.share-icon.copied {
  background: #4A4B4A;
  color: white;
}

@media (max-width: 480px) {
  .share-icon {
    width: 28px;
    height: 28px;
  }

  .share-icon svg {
    width: 16px;
    height: 16px;
  }
}

/* Article content */
.article-content {
  color: #4A4B4A;
  line-height: 1.8;
  font-size: 1rem;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #B0E7FC;
  position: relative;
  scroll-margin-top: 2rem;
}

.article-content h2 .heading-link {
  text-decoration: none;
  color: inherit;
}

.article-content h2 .heading-link:hover {
  text-decoration: none;
  color: inherit;
}

.article-content h2 .heading-anchor {
  position: absolute;
  left: -1.75rem;
  top: calc(50% - 0.25rem);
  transform: translateY(-50%);
  opacity: 0.4;
  transition: all 0.2s ease;
  text-decoration: none;
  color: #4A4B4A;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 4px;
}

.article-content h2 .heading-anchor:hover {
  opacity: 1;
  background: #FDF4CD;
  border-bottom: none;
}

.article-content h2 .heading-anchor svg {
  width: 1rem;
  height: 1rem;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content a {
  color: #0066cc;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.article-content a:hover {
  border-bottom-color: #0066cc;
}

.article-content code {
  font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
  background: rgba(176, 231, 252, 0.3);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

.article-content pre {
  background: #2d2d2d;
  color: #f8f8f2;
  padding: 1.25rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin-bottom: 1.25rem;
  font-size: 0.875rem;
  line-height: 1.6;
}

.article-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.article-content blockquote {
  border-left: 4px solid #B0E7FC;
  padding-left: 1rem;
  margin: 1.25rem 0;
  color: #666;
  font-style: italic;
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: 0.5rem;
  margin: 1rem 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.25rem;
}

.article-content th,
.article-content td {
  padding: 0.75rem;
  border: 1px solid rgba(74, 75, 74, 0.2);
  text-align: left;
}

.article-content th {
  background: rgba(176, 231, 252, 0.3);
  font-weight: 600;
}

/* OG Card styles */
.og-card {
  display: flex;
  border: 1px solid rgba(74, 75, 74, 0.2);
  border-radius: 0.5rem;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  margin: 1.25rem 0;
  transition: box-shadow 0.2s ease;
  background: white;
}

.og-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.og-card-content {
  flex: 1;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.og-card-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.og-card-description {
  font-size: 0.8rem;
  color: #666;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.og-card-site {
  font-size: 0.75rem;
  color: #888;
}

.og-card-image {
  width: 200px;
  flex-shrink: 0;
}

.og-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  margin: 0;
  border-radius: 0;
}

/* Twitter embed styles */
.twitter-embed {
  margin: 1.25rem 0;
}

.twitter-embed blockquote {
  border-left: none;
  font-style: normal;
  padding-left: 0;
}

/* Footer */
footer {
  margin-top: auto;
  padding: 2rem;
  text-align: center;
  z-index: 1;
  animation: fadeInUp 1s ease-out 0.8s both;
}

.copyright-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

footer .copyright {
  font-size: 0.875rem;
  color: #4A4B4A;
  opacity: 0.7;
}

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: #4A4B4A;
  text-decoration: none;
  transition: all 0.3s ease;
  background: rgba(255, 255, 255, 0.3);
}

.social-icon:hover {
  background: #FDF4CD;
  transform: scale(1.1);
}

.social-icon svg {
  width: 18px;
  height: 18px;
}

footer .gopher-credit {
  margin-top: 1.5rem;
  font-size: 0.7rem;
  color: #4A4B4A;
  opacity: 0.5;
  text-align: right;
}

footer .gopher-credit a {
  color: #4A4B4A;
  text-decoration: underline;
}

/* Utility classes */
.hidden {
  display: none;
}

/* Responsive */
@media (max-width: 768px) {
  article {
    padding: 2rem;
  }

  .article-title {
    font-size: 1.5rem;
  }

  .og-card {
    flex-direction: column-reverse;
  }

  .og-card-image {
    width: 100%;
    height: 150px;
  }
}

@media (max-width: 480px) {
  header {
    padding: 1.5rem;
  }

  main {
    padding: 0 1.5rem 3rem;
  }

  article {
    padding: 1.5rem;
  }

  .article-title {
    font-size: 1.25rem;
  }

  .article-content h2 .heading-anchor {
    display: none;
  }
}