/* Web3・暗号資産業界サイト - ブログ記事スタイル */

:root {
  --primary-color: #6366f1;
  --secondary-color: #8b5cf6;
  --accent-color: #f59e0b;
  --dark-bg: #0f172a;
  --light-bg: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --border-color: #334155;
  --success-color: #10b981;
  --warning-color: #eab308;
  --error-color: #ef4444;
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --header-height: 80px;
  --z-header: 100;
  --z-nav: 90;
  --z-overlay: 80;
  --z-content: 10;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
  background: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.8;
  overflow-x: hidden;
}

/* ヘッダー */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: var(--z-header);
  transition: var(--transition);
}

header.scrolled {
  background: rgba(15, 23, 42, 0.98);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

nav {
  height: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: var(--z-nav);
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  white-space: nowrap;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo span {
  display: inline;
  margin-left: 0.2em;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-item a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: var(--transition);
  padding: 0.5rem 0;
}

.nav-item a:hover,
.nav-item a.active {
  color: var(--primary-color);
}

.nav-item a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width 0.3s ease;
}

.nav-item a:hover::after,
.nav-item a.active::after {
  width: 100%;
}

/* ハンバーガーメニュー */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 25px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: calc(var(--z-header) + 10);
}

.hamburger span {
  width: 100%;
  height: 3px;
  background: var(--text-primary);
  transition: var(--transition);
  border-radius: 3px;
}

/* メインコンテンツ */
main {
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

/* ブログ記事ヘッダー */
.blog-header {
  padding: 4rem 2rem 2rem;
  background: linear-gradient(180deg, var(--light-bg) 0%, var(--dark-bg) 100%);
  border-bottom: 1px solid var(--border-color);
}

.blog-header-content {
  max-width: 1200px;
  margin: 0 auto;
}

.blog-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.blog-meta {
  display: flex;
  gap: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.blog-meta span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.blog-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* メイン画像 */
.blog-featured-image {
  width: 100%;
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.blog-featured-image img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

/* 2カラムレイアウト */
.blog-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 3rem 2rem;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 3rem;
}

/* メインコンテンツエリア */
.blog-content {
  max-width: 800px;
}

/* 目次 */
.table-of-contents {
  background: var(--light-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.table-of-contents h2 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.table-of-contents ul {
  list-style: none;
  padding-left: 0;
}

.table-of-contents li {
  margin-bottom: 0.5rem;
}

.table-of-contents a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  display: block;
  padding: 0.3rem 0;
}

.table-of-contents a:hover {
  color: var(--primary-color);
  padding-left: 0.5rem;
}

/* 記事本文 */
.blog-content h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--text-primary);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-color);
}

.blog-content h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
  color: var(--text-primary);
}

.blog-content p {
  margin-bottom: 1.5rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.blog-content ul,
.blog-content ol {
  margin: 1.5rem 0;
  padding-left: 2rem;
  color: var(--text-secondary);
}

.blog-content li {
  margin-bottom: 0.75rem;
  line-height: 1.8;
}

.blog-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.blog-content em {
  color: var(--accent-color);
  font-style: italic;
}

.blog-content a {
  color: var(--primary-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.blog-content a:hover {
  color: var(--secondary-color);
  border-bottom-color: var(--secondary-color);
}

.blog-content code {
  background: var(--light-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 0.9em;
  color: var(--accent-color);
}

.blog-content pre {
  background: var(--light-bg);
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border-color);
}

.blog-content pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

.blog-content blockquote {
  border-left: 4px solid var(--primary-color);
  padding-left: 1.5rem;
  margin: 1.5rem 0;
  color: var(--text-secondary);
  font-style: italic;
  background: var(--light-bg);
  padding: 1rem 1.5rem;
  border-radius: 0 8px 8px 0;
}

/* サイドバー */
.blog-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 2rem);
  height: fit-content;
}

.sidebar-section {
  background: var(--light-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.sidebar-section h3 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.sidebar-section ul {
  list-style: none;
  padding: 0;
}

.sidebar-section li {
  margin-bottom: 0.75rem;
}

.sidebar-section a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  display: block;
  padding: 0.5rem 0;
  border-bottom: 1px solid transparent;
}

.sidebar-section a:hover {
  color: var(--primary-color);
  border-bottom-color: var(--border-color);
}

/* カテゴリー・タグ */
.categories,
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.category-tag,
.tag-item {
  background: var(--dark-bg);
  color: var(--text-secondary);
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}

.category-tag:hover,
.tag-item:hover {
  background: var(--primary-color);
  color: var(--text-primary);
  border-color: var(--primary-color);
}

/* 記事下部のアクション */
.blog-actions {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.blog-actions a {
  background: var(--primary-color);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.blog-actions a:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* フッター */
footer {
  background: var(--light-bg);
  border-top: 1px solid var(--border-color);
  padding: 3rem 2rem 2rem;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.footer-section a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  max-width: 1400px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* レスポンシブデザイン */
@media (max-width: 1024px) {
  .blog-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .blog-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    left: -100%;
    top: var(--header-height);
    flex-direction: column;
    background: rgba(15, 23, 42, 0.98);
    width: 100%;
    text-align: center;
    transition: left 0.3s ease;
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-menu.active {
    left: 0;
  }

  .blog-title {
    font-size: 1.8rem;
  }

  .blog-header {
    padding: 3rem 1rem 1.5rem;
  }

  .blog-container {
    padding: 2rem 1rem;
  }

  .blog-content h2 {
    font-size: 1.5rem;
  }

  .blog-content h3 {
    font-size: 1.2rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .blog-title {
    font-size: 1.5rem;
  }

  .blog-meta {
    flex-direction: column;
    gap: 0.5rem;
  }

  nav {
    padding: 0 1rem;
  }

  .blog-actions {
    flex-direction: column;
  }

  .blog-actions a {
    text-align: center;
  }
}