/* RANDOM BUY Blog - Shared Styles */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700;900&display=swap');

:root {
  --navy-deep: #0a0e1a;
  --navy-main: #0f1525;
  --navy-card: #141c2e;
  --navy-light: #1a2340;
  --cyan: #4cc9f0;
  --cyan-glow: rgba(76, 201, 240, 0.15);
  --cyan-border: rgba(76, 201, 240, 0.3);
  --white: #ffffff;
  --white-80: rgba(255, 255, 255, 0.8);
  --white-60: rgba(255, 255, 255, 0.6);
  --white-40: rgba(255, 255, 255, 0.4);
  --white-15: rgba(255, 255, 255, 0.15);
  --white-08: rgba(255, 255, 255, 0.08);
  --gradient-cyan: linear-gradient(135deg, #4cc9f0, #7b61ff);
  --max-width: 820px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--navy-deep);
  color: var(--white-80);
  line-height: 1.9;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* ===== HEADER ===== */
.blog-header {
  background: var(--navy-main);
  border-bottom: 1px solid var(--white-15);
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.blog-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.blog-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--white);
}

.blog-logo-text {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 2px;
}

.blog-logo-sub {
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 1px;
}

.blog-nav {
  display: flex;
  gap: 24px;
}

.blog-nav a {
  color: var(--white-60);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s;
}

.blog-nav a:hover {
  color: var(--cyan);
}

/* ===== ARTICLE HERO ===== */
.article-hero {
  background: linear-gradient(180deg, var(--navy-main) 0%, var(--navy-deep) 100%);
  padding: 80px 24px 60px;
  text-align: center;
}

.article-category {
  display: inline-block;
  background: var(--cyan-glow);
  border: 1px solid var(--cyan-border);
  color: var(--cyan);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

.article-hero h1 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 900;
  color: var(--white);
  line-height: 1.5;
  max-width: var(--max-width);
  margin: 0 auto 16px;
}

.article-meta {
  color: var(--white-40);
  font-size: 13px;
  display: flex;
  gap: 20px;
  justify-content: center;
  align-items: center;
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ===== ARTICLE CONTENT ===== */
.article-body {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.article-body h2 {
  font-size: 22px;
  font-weight: 900;
  color: var(--white);
  margin: 56px 0 20px;
  padding-left: 16px;
  border-left: 4px solid var(--cyan);
  line-height: 1.5;
}

.article-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin: 40px 0 16px;
  line-height: 1.5;
}

.article-body p {
  margin-bottom: 24px;
  color: var(--white-80);
}

.article-body ul, .article-body ol {
  margin: 0 0 24px 24px;
  color: var(--white-80);
}

.article-body li {
  margin-bottom: 8px;
}

.article-body strong {
  color: var(--white);
  font-weight: 700;
}

.article-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

.article-body a:hover {
  border-bottom-color: var(--cyan);
}

/* Callout Box */
.callout {
  background: var(--navy-card);
  border: 1px solid var(--white-15);
  border-radius: 12px;
  padding: 24px 28px;
  margin: 32px 0;
}

.callout.warning {
  border-left: 4px solid #ff6b6b;
}

.callout.info {
  border-left: 4px solid var(--cyan);
}

.callout.success {
  border-left: 4px solid #51cf66;
}

.callout-title {
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
  font-size: 15px;
}

.callout p {
  margin-bottom: 0;
  font-size: 14px;
}

/* Table */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0 32px;
  font-size: 14px;
}

.article-body th {
  background: var(--navy-light);
  color: var(--cyan);
  font-weight: 700;
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--white-15);
}

.article-body td {
  padding: 12px 16px;
  border: 1px solid var(--white-15);
  color: var(--white-80);
}

.article-body tr:nth-child(even) td {
  background: var(--white-08);
}

/* Blockquote */
.article-body blockquote {
  background: var(--navy-card);
  border-left: 4px solid var(--cyan);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--white-60);
}

/* ===== CTA SECTION ===== */
.cta-box {
  background: linear-gradient(135deg, var(--navy-card), var(--navy-light));
  border: 1px solid var(--cyan-border);
  border-radius: 16px;
  padding: 40px 32px;
  text-align: center;
  margin: 48px 0;
}

.cta-box h3 {
  font-size: 20px;
  color: var(--white);
  margin-bottom: 12px;
}

.cta-box p {
  color: var(--white-60);
  margin-bottom: 24px;
  font-size: 14px;
}

.cta-btn {
  display: inline-block;
  background: var(--gradient-cyan);
  color: #ffffff;
  font-weight: 700;
  padding: 14px 40px;
  border-radius: 50px;
  text-decoration: none;
  font-size: 15px;
  transition: transform 0.3s, box-shadow 0.3s;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(76, 201, 240, 0.3);
}

.cta-sub {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  color: var(--white-40);
}

/* ===== RELATED ARTICLES ===== */
.related-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px 80px;
  border-top: 1px solid var(--white-15);
}

.related-section h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 32px;
  text-align: center;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.related-card {
  background: var(--navy-card);
  border: 1px solid var(--white-15);
  border-radius: 12px;
  padding: 24px;
  text-decoration: none;
  transition: transform 0.3s, border-color 0.3s;
  display: block;
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-border);
}

.related-card .card-category {
  font-size: 11px;
  color: var(--cyan);
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.related-card .card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.6;
  margin-bottom: 8px;
}

.related-card .card-excerpt {
  font-size: 13px;
  color: var(--white-40);
  line-height: 1.6;
}

/* ===== FOOTER ===== */
.blog-footer {
  background: var(--navy-main);
  border-top: 1px solid var(--white-15);
  padding: 40px 24px;
  text-align: center;
}

.blog-footer p {
  color: var(--white-40);
  font-size: 13px;
  margin-bottom: 8px;
}

.blog-footer a {
  color: var(--cyan);
  text-decoration: none;
}

/* ===== BLOG INDEX ===== */
.blog-index-hero {
  background: linear-gradient(180deg, var(--navy-main) 0%, var(--navy-deep) 100%);
  padding: 80px 24px 48px;
  text-align: center;
}

.blog-index-hero h1 {
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 12px;
}

.blog-index-hero p {
  color: var(--white-60);
  font-size: 15px;
}

.category-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.category-filter button {
  background: var(--navy-card);
  border: 1px solid var(--white-15);
  color: var(--white-60);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.3s;
  font-family: 'Noto Sans JP', sans-serif;
}

.category-filter button:hover,
.category-filter button.active {
  background: var(--cyan-glow);
  border-color: var(--cyan-border);
  color: var(--cyan);
}

.articles-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--navy-card);
  border: 1px solid var(--white-15);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s, border-color 0.3s;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-border);
}

.article-card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card .card-category {
  font-size: 11px;
  color: var(--cyan);
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.article-card .card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.6;
  margin-bottom: 12px;
}

.article-card .card-excerpt {
  font-size: 13px;
  color: var(--white-40);
  line-height: 1.7;
  flex: 1;
}

.article-card .card-meta {
  font-size: 12px;
  color: var(--white-40);
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--white-08);
}

/* Number badge */
.num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--gradient-cyan);
  color: var(--navy-deep);
  font-weight: 900;
  font-size: 14px;
  border-radius: 50%;
  margin-right: 8px;
  flex-shrink: 0;
}

.numbered-list {
  list-style: none;
  margin-left: 0;
  counter-reset: none;
}

.numbered-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  padding: 16px;
  background: var(--navy-card);
  border-radius: 8px;
  border: 1px solid var(--white-08);
}

/* ===== TOC ===== */
.toc {
  background: var(--navy-card);
  border: 1px solid var(--white-15);
  border-radius: 12px;
  padding: 24px 28px;
  margin: 0 0 40px;
}

.toc-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}

.toc ol {
  list-style: decimal;
  margin: 0 0 0 20px;
}

.toc li {
  margin-bottom: 4px;
}

.toc a {
  color: var(--white-60);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s;
}

.toc a:hover {
  color: var(--cyan);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .blog-header-inner {
    flex-direction: column;
    gap: 12px;
  }
  .blog-nav {
    gap: 16px;
  }
  .article-hero {
    padding: 60px 16px 40px;
  }
  .article-body {
    padding: 32px 16px 60px;
  }
  .cta-box {
    padding: 32px 20px;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .article-meta {
    flex-direction: column;
    gap: 8px;
  }
}