/* Notion Design System — Blog Styles (hikari-compare)
   ===================================================== */

/* CSS Variables */
:root {
  --notion-bg: #f8fafc;
  --notion-bg-gray: #f1f5f9;
  --notion-bg-hover: rgba(15, 23, 42, 0.04);
  --notion-text-default: #1e293b;
  --notion-text-gray: #64748b;
  --notion-border: rgba(15, 23, 42, 0.08);
  --notion-border-light: rgba(15, 23, 42, 0.06);
  --notion-radius: 8px;
  --accent-primary: #3b82f6;
  --accent-primary-light: rgba(59, 130, 246, 0.08);
  --font-body: 'Inter', 'Noto Sans JP', system-ui, -apple-system, sans-serif;
  --font-heading: 'Inter', 'Noto Sans JP', system-ui, -apple-system, sans-serif;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --header-height: 80px;
  --max-width: 1200px;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-primary);
  color: #fff;
  padding: 8px 16px;
  z-index: 1001;
  font-weight: 600;
  transition: top 0.2s;
  font-family: var(--font-body);
}
.skip-link:focus { top: 0; }

/* ========================================
   Main Layout
   ======================================== */
.blog-main {
  padding: 4rem 0 6rem;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
  background: var(--notion-bg);
  font-family: var(--font-body);
}

.blog-container,
.blog-layout,
.content-wrapper {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2.5rem;
  align-items: start;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 5%;
}

.main-content,
.blog-article { min-width: 0; }

/* ========================================
   Blog List Page
   ======================================== */
.article-header {
  margin-bottom: 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--notion-border);
}

.article-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  color: var(--notion-text-default);
  font-family: var(--font-heading);
}

.article-meta {
  font-size: 1rem;
  color: var(--notion-text-gray);
  line-height: 1.6;
  margin: 0;
}

/* Blog Grid */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* Blog Card - Notion Style */
.blog-card {
  background: #fff;
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  overflow: hidden;
  transition: all 0.2s ease;
  box-shadow: rgba(0, 0, 0, 0.02) 0px 2px 8px, rgba(0, 0, 0, 0.01) 0px 1px 2px;
}

.blog-card:hover {
  transform: translateY(-2px);
  box-shadow: rgba(0, 0, 0, 0.06) 0px 6px 20px, rgba(0, 0, 0, 0.03) 0px 3px 8px;
  border-color: var(--accent-primary);
}

.blog-card a {
  color: inherit;
  text-decoration: none;
  display: block;
}

/* Card Thumbnail */
.card-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
  background: linear-gradient(135deg, #e8eef4 0%, #f0f4f8 100%);
}

.card-thumb img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

/* Card Body */
.card-body {
  padding: 1.25rem;
}

.card-body time {
  display: block;
  font-size: 0.875rem;
  color: var(--notion-text-gray);
  margin-bottom: 0.625rem;
  font-weight: 500;
}

.card-body h3 {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
  color: var(--notion-text-default);
  font-family: var(--font-heading);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-body p {
  font-size: 0.9rem;
  color: var(--notion-text-gray);
  line-height: 1.6;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ========================================
   Article Detail Page
   ======================================== */
.page-wrapper {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2.5rem;
  align-items: start;
}

.hero-image {
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--notion-radius);
  margin-bottom: 2rem;
  border: 1px solid var(--notion-border);
}

.article-content {
  color: var(--notion-text-default);
  line-height: 1.8;
  font-size: 1rem;
}

.article-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--notion-text-default);
  margin: 2.5rem 0 1rem;
  padding-left: 1rem;
  border-left: 3px solid var(--accent-primary);
  letter-spacing: -0.015em;
  font-family: var(--font-heading);
}

.article-content h3 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--notion-text-default);
  margin: 2rem 0 0.875rem;
  letter-spacing: -0.01em;
  font-family: var(--font-heading);
}

.article-content h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--notion-text-default);
  margin: 1.5rem 0 0.625rem;
  font-family: var(--font-heading);
}

.article-content p { margin-bottom: 1.25rem; color: var(--notion-text-default); }

.article-content a {
  color: var(--accent-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-content a:hover { text-decoration: none; opacity: 0.8; }

.article-content ul,
.article-content ol {
  margin: 1.25rem 0 1.25rem 1.5rem;
  padding: 0;
}

.article-content li {
  color: var(--notion-text-default);
  margin-bottom: 0.625rem;
  line-height: 1.7;
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--notion-radius);
  margin: 1.5rem 0;
  border: 1px solid var(--notion-border);
}

.article-content blockquote {
  border-left: 3px solid var(--accent-primary);
  margin: 1.5rem 0;
  padding: 0.75rem 0 0.75rem 1.25rem;
  color: var(--notion-text-gray);
  font-style: italic;
  background: var(--notion-bg-gray);
  border-radius: 0 var(--notion-radius) var(--notion-radius) 0;
}

.article-content strong {
  color: var(--notion-text-default);
  font-weight: 600;
}

/* FAQ */
.faq-item {
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  background: var(--notion-bg-gray);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
}

.faq-item p { margin-bottom: 0.75rem; }
.faq-item p:last-child { margin-bottom: 0; }

/* TOC */
.toc-container {
  background: var(--notion-bg-gray);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.toc-container summary {
  cursor: pointer;
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--notion-text-default);
  list-style: none;
}

.toc-container summary::-webkit-details-marker { display: none; }

.toc-list { margin: 0; padding-left: 1.2rem; }

.toc-list li {
  margin: 0.5rem 0;
  line-height: 1.5;
  color: var(--notion-text-gray);
}

.toc-list a {
  text-decoration: none;
  color: var(--accent-primary);
}

.toc-list a:hover { text-decoration: underline; }

/* Share Links */
.share-links {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--notion-border);
}

.share-links-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--notion-text-default);
  margin-bottom: 1rem;
}

.share-buttons {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.share-buttons a {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  color: var(--notion-text-default);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s ease;
  background: #fff;
  text-decoration: none;
}

.share-buttons a:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-primary-light);
}

/* ========================================
   Sidebar
   ======================================== */
.blog-sidebar,
.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
  align-self: start;
}

.sidebar-widget,
.sidebar-section {
  background: #fff;
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  box-shadow: rgba(0, 0, 0, 0.02) 0px 2px 8px, rgba(0, 0, 0, 0.01) 0px 1px 2px;
}

.sidebar-widget .widget-title,
.sidebar-section h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--notion-text-default);
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--notion-border);
  letter-spacing: -0.01em;
  font-family: var(--font-heading);
}

.widget-list,
.sidebar-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.widget-list li,
.sidebar-nav li { margin-bottom: 0.625rem; }

.widget-list a,
.sidebar-nav a {
  color: var(--notion-text-gray);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s;
  display: block;
  padding: 0.25rem 0;
}

.widget-list a:hover,
.sidebar-nav a:hover { color: var(--accent-primary); }

.widget-content {
  font-size: 0.9rem;
  color: var(--notion-text-gray);
  line-height: 1.6;
}

/* Ad Widget */
.ad-widget,
.sidebar-ad {
  padding: 0.75rem;
  text-align: center;
}

.ad-widget .amazon-banner,
.ad-widget img,
.sidebar-ad img {
  max-width: 100%;
  border-radius: 4px;
  transition: opacity 0.2s;
}

.ad-widget img:hover,
.sidebar-ad img:hover { opacity: 0.9; }

.ad-widget a,
.sidebar-ad a { display: inline-block; }

/* Amazon Top */
.amazon-top {
  background: linear-gradient(135deg, #f8f6f3 0%, #f0ede8 100%);
  border: 1px dashed var(--notion-border);
}

.amazon-top .amazon-banner { padding: 0.5rem; }

.amazon-top .amazon-banner a {
  color: var(--notion-text-gray);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
}

/* sitenavi ad block */
.sitenavi-ad-block {
  margin-bottom: 1.5rem;
  padding: 0.5rem;
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  background: var(--notion-bg-gray);
  text-align: center;
}

.sitenavi-ad-block img {
  display: block;
  margin: 0.5rem auto;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

/* ========================================
   Article Detail Page (template.html)
   ======================================== */
.article-header { margin-bottom: var(--space-xl); text-align: center; }

.article-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--notion-text-default);
  line-height: 1.3;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
  font-family: var(--font-heading);
}

.article-hero-image {
  margin: 0 0 var(--space-xl);
  border-radius: var(--notion-radius);
  overflow: hidden;
  background: var(--notion-bg-gray);
}

.article-hero-image img {
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: cover;
  display: block;
}

.article-body.notion-content {
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--notion-text-default);
}

.article-body.notion-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--notion-text-default);
  margin: var(--space-xl) 0 var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--notion-border);
  border-left: none;
  padding-left: 0;
  font-family: var(--font-heading);
}

.article-body.notion-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--notion-text-default);
  margin: var(--space-lg) 0 var(--space-sm);
  font-family: var(--font-heading);
}

.article-body.notion-content p { margin-bottom: var(--space-md); }

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

.article-body.notion-content li { margin-bottom: var(--space-xs); }

.article-body.notion-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--notion-radius);
  margin: var(--space-lg) 0;
}

.article-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--notion-border);
}

.back-to-blog {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--notion-text-gray);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: var(--space-sm) 0;
  transition: color 0.2s ease;
  text-decoration: none;
}

.back-to-blog:hover { color: var(--accent-primary); }

.back-to-blog svg { transition: transform 0.2s ease; }
.back-to-blog:hover svg { transform: translateX(-3px); }

/* Sidebar Card (template sidebar) */
.article-sidebar .sidebar-card {
  background: #fff;
  border-radius: var(--notion-radius);
  border: 1px solid var(--notion-border);
  overflow: hidden;
  margin-bottom: var(--space-lg);
}

.sidebar-card-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--notion-text-default);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--notion-border);
  margin: 0;
  background: var(--notion-bg-gray);
  font-family: var(--font-heading);
}

.sidebar-card-title svg { color: var(--notion-text-gray); }

.toc-nav { padding: var(--space-md); }

.toc-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-nav li {
  margin: 0;
  border-bottom: 1px solid var(--notion-border-light);
}

.toc-nav li:last-child { border-bottom: none; }

.toc-nav a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--notion-text-gray);
  font-size: 0.9375rem;
  transition: all 0.2s ease;
  border-radius: var(--notion-radius);
  text-decoration: none;
}

.toc-nav a:hover {
  background: var(--notion-bg-hover);
  color: var(--notion-text-default);
}

.related-list {
  list-style: none;
  margin: 0;
  padding: var(--space-md);
}

.related-list li { margin-bottom: var(--space-sm); }

.related-list a {
  display: block;
  padding: var(--space-sm);
  color: var(--notion-text-default);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--notion-radius);
  transition: all 0.2s ease;
  text-decoration: none;
}

.related-list a:hover {
  background: var(--notion-bg-hover);
  color: var(--accent-primary);
}

.sidebar-links { padding: var(--space-md); }

.sidebar-link-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  color: var(--notion-text-gray);
  font-size: 0.9375rem;
  border-radius: var(--notion-radius);
  transition: all 0.2s ease;
  text-decoration: none;
}

.sidebar-link-item:hover {
  background: var(--notion-bg-hover);
  color: var(--notion-text-default);
}

.ad-card {
  text-align: center;
  padding: var(--space-md);
}

.ad-card a { display: inline-block; }

.ad-card img {
  max-width: 100%;
  height: auto;
  border-radius: var(--notion-radius);
}

/* Breadcrumb */
.breadcrumb {
  background: var(--notion-bg-gray);
  padding: 1rem 0;
  border-bottom: 1px solid var(--notion-border);
}

.breadcrumb ol {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 0.5rem;
  flex-wrap: wrap;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 5%;
}

.breadcrumb li {
  font-size: 0.875rem;
  color: var(--notion-text-gray);
}

.breadcrumb a {
  color: var(--notion-text-gray);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--accent-primary); }

.breadcrumb-current {
  color: var(--notion-text-default);
  font-weight: 500;
}

/* ========================================
   Scroll to Top
   ======================================== */
.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--accent-primary);
  color: #fff;
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 100;
  display: none;
  font-weight: 700;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  align-items: center;
  justify-content: center;
}

.scroll-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.scroll-to-top.is-visible { display: flex; }

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1080px) {
  .blog-container,
  .blog-layout,
  .content-wrapper,
  .page-wrapper { grid-template-columns: 1fr; }

  .blog-sidebar,
  .sidebar {
    position: static;
    order: 2;
  }

  .blog-article,
  .main-content { order: 1; }
}

@media (max-width: 768px) {
  .blog-main { padding: 2rem 0 4rem; }

  .blog-container,
  .blog-layout,
  .content-wrapper {
    gap: 1.5rem;
    padding: 0 4%;
  }

  .article-title { font-size: 1.75rem; }
  .article-meta { font-size: 0.9rem; }
  .blog-grid { grid-template-columns: 1fr; }

  .ad-widget,
  .sidebar-ad {
    display: block !important;
    margin: 1rem 0;
    padding: 0.5rem;
  }

  .ad-widget img,
  .sidebar-ad img {
    max-width: 100%;
    height: auto;
  }

  .sidebar-widget,
  .sidebar-section {
    padding: 1rem;
    display: block;
    margin-bottom: 1rem;
  }

  .card-body { padding: 1rem; }
  .card-body h3 { font-size: 1rem; }

  .article-content h2 { font-size: 1.5rem; }
  .article-content h3 { font-size: 1.25rem; }

  .scroll-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 42px;
    height: 42px;
    font-size: 1.25rem;
  }
}

@media (max-width: 480px) {
  .blog-container,
  .blog-layout,
  .content-wrapper { padding: 0 3%; }

  .article-header { margin-bottom: 2rem; }
  .article-title { font-size: 1.5rem; }

  .card-body time { font-size: 0.8rem; }
  .card-body h3 { font-size: 0.95rem; }
  .card-body p { font-size: 0.85rem; }
}

/* Print styles */
@media print {
  .header,
  .article-sidebar,
  .footer,
  .scroll-to-top { display: none !important; }

  .blog-layout { display: block; }
  .article-content { max-width: 100%; }
}