/* Blog CSS - Inherits Valuup dark theme */
:root {
  --c-bg-base: #f8fafc;
  --c-bg-surface: rgba(0, 0, 0, 0.03);
  --c-bg-glass: rgba(255, 255, 255, 0.75);
  --c-bg-glass-hover: rgba(255, 255, 255, 0.95);
  --c-text-primary: #0f172a;
  --c-text-secondary: #334155;
  --c-text-muted: #64748b;
  --c-accent-1: #0ea5e9;
  --c-accent-2: #2563eb;
  --c-accent-3: #0d9488;
  --gradient-primary: linear-gradient(135deg, var(--c-accent-1) 0%, var(--c-accent-2) 100%);
  --gradient-text: linear-gradient(135deg, #0f172a 0%, #2563eb 100%);
  --font-en: 'Outfit', sans-serif;
  --font-jp: 'Noto Sans JP', sans-serif;
  --container-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --border-glass: 1px solid rgba(0, 0, 0, 0.08);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-jp);
  background-color: var(--c-bg-base);
  color: var(--c-text-primary);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
h1,h2,h3,h4,h5,h6 { font-family: var(--font-jp); font-weight: 700; line-height: 1.4; }
a { text-decoration: none; color: inherit; transition: color var(--transition-smooth); }
ul, ol { list-style: none; }

/* Layout */
.container { max-width: var(--container-width); margin: 0 auto; padding: 0 24px; }
.section-padding { padding: 80px 0; }

/* Background Effects */
.bg-blur-circle { position: fixed; border-radius: 50%; filter: blur(120px); opacity: 0.15; pointer-events: none; z-index: -1; }
.blur-1 { width: 500px; height: 500px; background: var(--c-accent-1); top: -100px; right: -100px; }
.blur-2 { width: 400px; height: 400px; background: var(--c-accent-3); bottom: -50px; left: -50px; }

/* Glass Effect */
.glass-card {
  background: var(--c-bg-glass);
  border: var(--border-glass);
  border-radius: var(--radius-md);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* Text */
.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-badge {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-accent-1);
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 24px;
}

/* Buttons */
.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(14,165,233,0.3); }
.btn-secondary {
  display: inline-block;
  padding: 12px 28px;
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--c-text-primary);
  border-radius: 50px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all var(--transition-smooth);
}
.btn-secondary:hover { background: rgba(0,0,0,0.05); border-color: rgba(0,0,0,0.15); }

/* Header */
.glass-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(20px);
  border-bottom: var(--border-glass);
}
.header-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo { font-family: var(--font-en); font-size: 1.5rem; font-weight: 800; }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-link { color: var(--c-text-secondary); font-size: 0.9rem; }
.nav-link:hover, .nav-link.active { color: var(--c-text-primary); }

/* Footer */
.footer { padding: 48px 0 0; border-top: var(--border-glass); }
.footer-content { display: flex; justify-content: space-between; align-items: flex-start; }
.footer-text { color: var(--c-text-muted); font-size: 0.85rem; margin-top: 8px; }
.footer-bottom { margin-top: 32px; padding: 20px 0; border-top: var(--border-glass); text-align: center; color: var(--c-text-muted); font-size: 0.8rem; }

/* =====================
   Blog Index Page
   ===================== */
.blog-hero { padding-top: 140px; text-align: center; }
.blog-hero-desc { color: var(--c-text-secondary); font-size: 1.1rem; }

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.blog-card {
  padding: 28px;
  transition: transform var(--transition-smooth), background var(--transition-smooth);
  cursor: pointer;
}
.blog-card:hover { transform: translateY(-4px); background: var(--c-bg-glass-hover); }
.blog-card-meta { display: flex; gap: 12px; margin-bottom: 12px; }
.blog-card-date { font-size: 0.8rem; color: var(--c-text-muted); font-family: var(--font-en); }
.blog-card-category {
  font-size: 0.75rem;
  color: var(--c-accent-1);
  background: rgba(14,165,233,0.1);
  padding: 2px 10px;
  border-radius: 20px;
}
.blog-card-title { font-size: 1.15rem; margin-bottom: 10px; line-height: 1.5; }
.blog-card-desc { font-size: 0.9rem; color: var(--c-text-secondary); line-height: 1.6; margin-bottom: 12px; }
.blog-card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.blog-tag {
  font-size: 0.7rem;
  color: var(--c-text-muted);
  background: rgba(0,0,0,0.05);
  padding: 2px 8px;
  border-radius: 4px;
}

/* =====================
   Blog Article Page
   ===================== */
.blog-article { padding-top: 120px; }
.blog-article-header { max-width: 1100px; margin: 0 auto 48px; }
.blog-back { color: var(--c-accent-1); font-size: 0.9rem; display: inline-block; margin-bottom: 24px; }
.blog-back:hover { text-decoration: underline; }
.blog-article-meta { display: flex; gap: 12px; margin-bottom: 16px; }
.blog-article-title { font-size: clamp(1.6rem, 3.5vw, 2.4rem); line-height: 1.4; margin-bottom: 16px; }
.blog-article-tags { display: flex; flex-wrap: wrap; gap: 8px; }

/* Two Column Layout */
.blog-two-column {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  max-width: 1100px;
  margin: 0 auto;
  align-items: start;
}

/* Sidebar */
.blog-sidebar {
  position: sticky;
  top: 100px;
}

.blog-article-body {
  min-width: 0;
  font-size: 1.05rem;
  line-height: 2;
  color: var(--c-text-secondary);
}
.blog-article-body h2 {
  font-size: 1.5rem;
  color: var(--c-text-primary);
  margin: 48px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(0,0,0,0.1);
}
.blog-article-body h3 {
  font-size: 1.2rem;
  color: var(--c-text-primary);
  margin: 36px 0 16px;
}
.blog-article-body h4 {
  font-size: 1.08rem;
  color: var(--c-text-primary);
  margin: 28px 0 12px;
  padding-left: 12px;
  border-left: 3px solid var(--c-accent-1);
}
.blog-article-body p { margin-bottom: 24px; }
.blog-article-body ul, .blog-article-body ol {
  margin: 0 0 24px 20px;
  list-style: disc;
}
.blog-article-body ol { list-style: decimal; }
.blog-article-body li { margin-bottom: 8px; }
.blog-article-body li.nested { margin-left: 20px; }
.blog-article-body a { color: var(--c-accent-1); text-decoration: underline; }
.blog-article-body strong { color: var(--c-text-primary); font-weight: 700; }

/* Inline Code */
.blog-article-body code {
  background: rgba(37, 99, 235, 0.08);
  color: #1e40af;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'SFMono-Regular', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
  font-size: 0.9em;
}

/* Code Blocks */
.blog-article-body pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 24px;
  line-height: 1.6;
  font-size: 0.88rem;
}
.blog-article-body pre code {
  background: none;
  color: inherit;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
}

/* Tables */
.blog-article-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 0.95rem;
}
.blog-article-body thead th {
  background: rgba(37, 99, 235, 0.08);
  color: var(--c-text-primary);
  font-weight: 700;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 2px solid rgba(37, 99, 235, 0.2);
}
.blog-article-body tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  color: var(--c-text-secondary);
}
.blog-article-body tbody tr:hover {
  background: rgba(37, 99, 235, 0.03);
}

/* TOC sub2 (h4) */
.toc-sub2 { margin-left: 32px; font-size: 0.88rem; }

/* Thumbnail / Eyecatch */
.blog-thumbnail {
  max-width: 1100px;
  margin: 0 auto 32px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: var(--border-glass);
}
.blog-thumbnail img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* Card Thumbnail */
.blog-card-thumb {
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  overflow: hidden;
  margin: -28px -28px 16px -28px;
}
.blog-card-thumb img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

/* Table of Contents (Sidebar) */
.blog-toc {
  padding: 20px;
  background: rgba(14,165,233,0.03);
  border: 1px solid rgba(14,165,233,0.1);
  border-radius: var(--radius-md);
}
.toc-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-accent-1);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}
.toc-list {
  list-style: none;
  counter-reset: toc-counter;
  padding: 0;
  margin: 0;
}
.toc-list li {
  counter-increment: toc-counter;
  margin-bottom: 8px;
}
.toc-list li::before {
  content: counter(toc-counter) ".";
  color: var(--c-accent-1);
  font-weight: 600;
  margin-right: 8px;
  font-family: var(--font-en);
  font-size: 0.85rem;
}
.toc-list li a {
  color: var(--c-text-secondary);
  font-size: 0.95rem;
  transition: color var(--transition-smooth);
}
.toc-list li a:hover { color: var(--c-accent-1); }
.toc-list li.toc-sub {
  padding-left: 24px;
  font-size: 0.9rem;
}
.toc-list li.toc-sub::before {
  font-size: 0.8rem;
}

/* CTA Block */
.blog-cta {
  max-width: 1100px;
  margin: 60px auto;
  padding: 40px;
  text-align: center;
  background: rgba(14,165,233,0.05);
  border: 1px solid rgba(14,165,233,0.15);
}
.blog-cta h3 { font-size: 1.3rem; margin-bottom: 12px; color: var(--c-text-primary); }
.blog-cta p { color: var(--c-text-secondary); margin-bottom: 20px; }

.blog-article-footer {
  max-width: 1100px;
  margin: 40px auto 0;
  text-align: center;
}

/* Responsive */
@media (max-width: 960px) {
  .blog-two-column {
    grid-template-columns: 1fr;
  }
  .blog-sidebar {
    position: static;
    order: -1;
    margin-bottom: 32px;
  }
}
@media (max-width: 768px) {
  .blog-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 16px; }
  .blog-article-body { font-size: 1rem; }
}

/* Breadcrumb */
.breadcrumb {
  padding: 16px 0 0;
}
.breadcrumb-list {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.85rem;
  color: var(--c-text-muted);
  flex-wrap: wrap;
  gap: 4px;
}
.breadcrumb-list li:not(:last-child)::after {
  content: "›";
  margin-left: 8px;
  color: var(--c-text-muted);
}
.breadcrumb-list a {
  color: var(--c-accent-2);
  text-decoration: none;
}
.breadcrumb-list a:hover {
  text-decoration: underline;
}
.breadcrumb-list [aria-current="page"] {
  color: var(--c-text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 400px;
}

/* Category Filter */
.blog-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
  justify-content: center;
}
.filter-btn {
  padding: 8px 20px;
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 100px;
  background: transparent;
  color: var(--c-text-secondary);
  font-size: 0.85rem;
  font-family: 'Noto Sans JP', sans-serif;
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn:hover {
  border-color: var(--c-accent-2);
  color: var(--c-accent-2);
}
.filter-btn.active {
  background: var(--c-accent-2);
  color: #fff;
  border-color: var(--c-accent-2);
}