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

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

/* Article Header */
.article-header {
  background-color: #fff;
  padding: 20px 0;
  border-bottom: 1px solid #eee;
  margin-bottom: 20px;
}

.breadcrumb-link {
  font-size: 12px;
  color: #999;
  text-decoration: none;
  margin-bottom: 15px;
  display: inline-block;
}

.breadcrumb-link:hover {
  color: #666;
}

.article-title {
  font-size: 28px;
  font-weight: bold;
  color: #333;
  margin-bottom: 15px;
  line-height: 1.3;
}

.article-meta {
  font-size: 12px;
  color: #999;
  margin-bottom: 15px;
}

.article-social {
  display: flex;
  gap: 10px;
}

.article-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background-color: #dc0000;
  border-radius: 50%;
  color: white;
  text-decoration: none;
  font-size: 14px;
  transition: opacity 0.3s;
}

.article-social a:hover {
  opacity: 0.8;
}

/* Main Content */
.article-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
  margin-bottom: 40px;
}

.article-content {
  order: 2;
}

.article-sidebar {
  order: 2;
}

/* Article Image */
.article-featured-image {
  width: 100%;
  height: 250px;
  background-color: #e0e0e0;
  border-radius: 8px;
  object-fit: cover;
  margin-bottom: 30px;
}

/* Article Body */
.article-body {
  background: white;
  padding: 20px;
  border-radius: 8px;
  line-height: 1.8;
}

.article-body p {
  margin-bottom: 15px;
  font-size: 14px;
  color: #555;
}

.article-body h2 {
  font-size: 20px;
  font-weight: bold;
  color: #333;
  margin-top: 15px;
  margin-bottom: 15px;
  text-transform: none;
}

.article-body h3 {
  font-size: 16px;
  font-weight: 600;
  color: #333;
  margin-top: 20px;
  margin-bottom: 10px;
  text-transform: none;
}

.article-body ul {
  margin-left: 20px;
  margin-bottom: 20px;
}

.article-body li {
  margin-bottom: 8px;
  font-size: 14px;
  color: #555;
}

.article-body strong {
  color: #333;
  font-weight: 600;
}

.article-body .highlight {
  background-color: #f5f5f5;
  padding: 20px;
  border-left: 4px solid #ffcc00;
  margin: 20px 0;
  border-radius: 4px;
}

.article-body img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 10px 0;
}

/* Author Sidebar */
.author-box {
  background: white;
  padding: 20px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  margin-bottom: 20px;
}

.author-image {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 15px;
  background-color: #e0e0e0;
}

.author-title {
  font-size: 12px;
  color: #dc0000;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 10px;
}

.author-name {
  font-size: 16px;
  font-weight: bold;
  color: #333;
  margin-bottom: 5px;
}

.author-position {
  font-size: 12px;
  color: #999;
  margin-bottom: 15px;
}

.author-description {
  font-size: 12px;
  color: #666;
  line-height: 1.6;
}

/* Share Button */
.share-button {
  background-color: #dc0000;
  color: white;
  border: none;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  width: 100%;
  margin-top: 20px;
  transition: background-color 0.3s;
}

.share-button:hover {
  background-color: #b30000;
}

.share-button-text::before {
  content: "↗ ";
}

/* Tablet */
@media (min-width: 640px) {
  .article-title {
    font-size: 36px;
  }

  .article-container {
    padding: 0 20px;
  }

  .article-featured-image {
    height: 300px;
  }

  .article-body {
    padding: 30px;
  }

  .article-body p {
    font-size: 15px;
  }

  .article-body h2 {
    font-size: 22px;
  }

  .article-body li {
    font-size: 15px;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .article-title {
    font-size: 42px;
  }

  .article-container {
    grid-template-columns: 1fr 300px;
    gap: 40px;
    max-width: 1100px;
  }

  .article-content {
    order: 1;
  }

  .article-sidebar {
    order: 2;
  }

  .article-featured-image {
    height: 400px;
  }

  .article-body {
    padding: 40px;
    font-size: 16px;
  }

  .article-body p {
    font-size: 16px;
  }

  .article-body h2 {
    font-size: 24px;
  }

  .article-body li {
    font-size: 15px;
  }

  .author-box {
    position: sticky;
    top: 20px;
  }
}

/* Article Header Section */
.article-header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 30px 15px;
}

@media (min-width: 640px) {
  .article-header-container {
    padding: 40px 20px;
  }
}

@media (min-width: 1024px) {
  .article-header-container {
    padding: 50px 20px;
  }
}

/* Back Link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #999;
  text-decoration: none;
  font-size: 13px;
  margin-bottom: 20px;
  transition: color 0.3s;
}

.back-link:hover {
  color: #666;
}

.back-link::before {
  content: "← ";
}