/**
 * AIギフト診断 - Blog Stylesheet
 * Design: Gemini "Warm Taupe" Edition（LP統一デザイン）
 */

/* ============================================
   Blog Main Layout
   ============================================ */
.blog-main {
  padding-top: 5rem;
  min-height: 100vh;
  background-color: var(--stone-50);
}

/* ============================================
   Blog Hero Section（LPのセクションスタイル）
   ============================================ */
.blog-hero {
  position: relative;
  padding: 5rem 0 3rem;
  background-color: var(--stone-50);
  overflow: hidden;
}

.blog-hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background-color: #f2efe9;
  border-radius: 0 0 0 80px;
  opacity: 0.5;
  z-index: 0;
}

.blog-hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.blog-hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 400;
  color: var(--stone-900);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.1em;
}

.blog-hero-description {
  font-size: 1rem;
  color: var(--stone-500);
  line-height: 1.9;
}

/* ============================================
   Category Filter（LPのボタンスタイル）
   ============================================ */
.blog-categories {
  padding: var(--space-xl) 0;
  background: var(--stone-50);
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.category-tab {
  padding: 0.5rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--stone-500);
  background: white;
  border: 1px solid var(--stone-200);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  letter-spacing: 0.1em;
}

.category-tab:hover {
  border-color: var(--stone-400);
  color: var(--stone-700);
}

.category-tab.active {
  background: var(--stone-800);
  border-color: var(--stone-800);
  color: white;
}

/* ============================================
   Blog Grid Section
   ============================================ */
.blog-grid-section {
  padding: var(--space-2xl) 0 var(--space-4xl);
  background: var(--stone-50);
}

.blog-grid {
  display: grid;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .blog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ============================================
   Blog Card（LPのカードスタイル）
   ============================================ */
.blog-card {
  position: relative;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--stone-100);
  transition: all var(--transition-normal);
}

.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.1);
  border-color: var(--stone-200);
}

.blog-card a {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
}

.blog-card-image {
  height: 160px;
  background: linear-gradient(135deg, var(--stone-50) 0%, #f2efe9 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--stone-100);
  overflow: hidden;
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.blog-card:hover .blog-card-image img {
  transform: scale(1.05);
}

.blog-card-emoji {
  font-size: 3.5rem;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.blog-card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
}

.blog-card-category {
  display: inline-block;
  width: fit-content;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--primary-dark);
  background: var(--primary-light);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.1em;
}

.blog-card-title {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--stone-800);
  line-height: 1.5;
  margin-bottom: var(--space-sm);
  transition: color var(--transition-normal);
}

.blog-card:hover .blog-card-title {
  color: var(--primary-dark);
}

.blog-card-excerpt {
  flex: 1;
  font-size: 0.8125rem;
  color: var(--stone-500);
  line-height: 1.7;
}

/* ============================================
   Blog CTA Section（LPのCTAスタイル）
   ============================================ */
.blog-cta-section {
  position: relative;
  padding: var(--space-4xl) 0;
  background-color: var(--stone-50);
  text-align: center;
  overflow: hidden;
}

.blog-cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(168, 139, 125, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
}

.blog-cta-content {
  position: relative;
  z-index: 1;
}

.blog-cta-content h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 400;
  color: var(--stone-900);
  margin-bottom: var(--space-md);
  letter-spacing: 0.05em;
}

.blog-cta-content p {
  color: var(--stone-500);
  margin-bottom: var(--space-xl);
  line-height: 1.8;
}

/* ============================================
   Blog Article Page
   ============================================ */
.blog-article {
  max-width: 760px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg) var(--space-4xl);
}

.blog-article-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--stone-200);
}

.blog-article-category {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--primary-dark);
  background: var(--primary-light);
  padding: 0.375rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.15em;
}

.blog-article-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 400;
  color: var(--stone-900);
  line-height: 1.4;
  letter-spacing: 0.03em;
}

/* ============================================
   Article Content
   ============================================ */
.blog-article-content {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 2;
  color: var(--stone-600);
}

.blog-article-content h2 {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 500;
  color: var(--stone-900);
  margin: var(--space-3xl) 0 var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--primary-light);
  letter-spacing: 0.03em;
}

.blog-article-content h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--stone-800);
  margin: var(--space-2xl) 0 var(--space-md);
  letter-spacing: 0.02em;
}

.blog-article-content p {
  margin-bottom: var(--space-lg);
  color: var(--stone-600);
}

.blog-article-content strong {
  color: var(--stone-800);
  font-weight: 600;
}

.blog-article-content a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: var(--primary-light);
  text-underline-offset: 3px;
  transition: all var(--transition-normal);
}

.blog-article-content a:hover {
  color: var(--primary-dark);
  text-decoration-color: var(--primary);
}

.blog-article-content ul,
.blog-article-content ol {
  margin: var(--space-lg) 0;
  padding-left: var(--space-xl);
}

.blog-article-content li {
  margin-bottom: var(--space-sm);
  color: var(--stone-600);
  line-height: 1.8;
}

.blog-article-content li::marker {
  color: var(--primary);
}

/* Tables */
.blog-article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xl) 0;
  font-size: 0.9375rem;
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.blog-article-content th,
.blog-article-content td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--stone-100);
}

.blog-article-content th {
  background: var(--stone-800);
  color: white;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.blog-article-content tr:last-child td {
  border-bottom: none;
}

.blog-article-content tr:hover td {
  background: var(--stone-50);
}

/* Blockquote */
.blog-article-content blockquote {
  margin: var(--space-xl) 0;
  padding: var(--space-lg);
  background: white;
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-sm);
}

.blog-article-content blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--stone-600);
}

/* ============================================
   Article CTA Box
   ============================================ */
.blog-article-cta {
  margin: var(--space-3xl) 0;
  padding: var(--space-2xl);
  background: white;
  border-radius: var(--radius-xl);
  text-align: center;
  border: 1px solid var(--stone-200);
  box-shadow: var(--shadow-sm);
}

.blog-article-cta h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--stone-900);
  margin-bottom: var(--space-md);
  letter-spacing: 0.05em;
}

.blog-article-cta p {
  font-size: 0.9375rem;
  color: var(--stone-500);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.blog-article-cta .btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 2rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 400;
  color: white;
  background: var(--stone-800);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  letter-spacing: 0.15em;
}

.blog-article-cta .btn:hover {
  background: var(--stone-900);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -4px rgba(0, 0, 0, 0.15);
}

/* ============================================
   Blog Navigation
   ============================================ */
.blog-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--stone-200);
}

.blog-nav-back,
.blog-nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  color: var(--stone-500);
  transition: color var(--transition-normal);
  letter-spacing: 0.05em;
}

.blog-nav-back:hover,
.blog-nav-link:hover {
  color: var(--primary);
}

/* ============================================
   Header Active State
   ============================================ */
.header-nav a.active {
  color: var(--primary);
  font-weight: 400;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .blog-hero {
    padding: 4rem 0 2rem;
  }

  .blog-hero::before {
    display: none;
  }

  .category-tabs {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--space-sm);
    -webkit-overflow-scrolling: touch;
  }

  .category-tabs::-webkit-scrollbar {
    display: none;
  }

  .category-tab {
    flex-shrink: 0;
  }

  .blog-article {
    padding: var(--space-xl) var(--space-md) var(--space-3xl);
  }

  .blog-article-content {
    font-size: 0.9375rem;
  }

  .blog-article-content h2 {
    font-size: 1.25rem;
  }

  .blog-article-content h3 {
    font-size: 1.0625rem;
  }

  .blog-article-cta {
    padding: var(--space-xl);
  }

  .blog-nav {
    flex-direction: column;
    align-items: flex-start;
  }
}