/* ===== リセット & ベース ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #1f2937;
  --bg-code: #0f1729;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3ea8ff;
  --accent-hover: #0f83fd;
  --border: #334155;
  --tag-bg: #1e3a5f;
  --tag-text: #7dd3fc;
  --max-width: 780px;
}

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
}

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

/* ===== ヘッダー ===== */
.blog-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.blog-logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.blog-logo:hover {
  color: var(--accent);
}

.blog-nav {
  display: flex;
  gap: 20px;
}

.blog-nav a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

/* ===== メイン ===== */
.blog-main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 40px 24px;
}

/* ===== 記事一覧 ===== */
.list-title {
  font-size: 1.8rem;
  margin-bottom: 8px;
}

.list-description {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.posts-list {
  display: flex;
  flex-direction: column;
}

.post-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 16px;
  transition: border-color 0.2s, transform 0.2s;
}

.post-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.post-card-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.post-card-title {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin: 8px 0;
  line-height: 1.5;
}

.post-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.post-card-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ===== タグ ===== */
.tag {
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 20px;
}

/* ===== 記事ページ ===== */
.post-container {
  max-width: var(--max-width);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.post-meta time {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.post-tags {
  display: flex;
  gap: 8px;
}

.post-title {
  font-size: 2rem;
  line-height: 1.4;
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

/* ===== 記事本文 ===== */
.post-body h2 {
  font-size: 1.5rem;
  margin: 48px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.post-body h3 {
  font-size: 1.25rem;
  margin: 36px 0 12px;
}

.post-body h4 {
  font-size: 1.1rem;
  margin: 24px 0 8px;
}

.post-body p {
  margin-bottom: 20px;
  color: var(--text-primary);
}

.post-body ul, .post-body ol {
  margin: 0 0 20px 24px;
}

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

.post-body strong {
  color: #fff;
}

.post-body blockquote {
  border-left: 4px solid var(--accent);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--bg-secondary);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
}

.post-body code {
  font-family: 'JetBrains Mono', monospace;
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--tag-text);
}

.post-body pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
}

.post-body pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-primary);
}

.post-body img {
  max-width: 100%;
  border-radius: 8px;
  margin: 20px 0;
}

.post-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.post-body a:hover {
  color: var(--accent-hover);
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.post-body th, .post-body td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
}

.post-body th {
  background: var(--bg-secondary);
  font-weight: 700;
}

/* ===== フッター ===== */
.blog-footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
  .blog-main {
    padding: 24px 16px;
  }

  .post-title {
    font-size: 1.5rem;
  }

  .post-body h2 {
    font-size: 1.3rem;
  }

  .post-card {
    padding: 16px;
  }
}