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

body {
  font-family: system-ui;
  font-size: 1rem;
  line-height: 1.75;
  color: #111827;
  background: #fff;
  padding: 1.5rem 0.75rem;
}

#wrapper {
  max-width: 680px;
  margin: 0 auto;
}

/* ヘッダー */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.75rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid #e5e7eb;
}

header a {
  font-size: 1.5rem;
  font-weight: 700;
  color: #111827;
  text-decoration: none;
}

.github-link {
  font-size: 0;
  color: #374151;
  display: flex;
  align-items: center;
}

.github-link:hover {
  color: #111827;
}

/* タグ */
.tag-section {
  margin-top: 2rem;
  padding-top: 0.5rem;
}

.page-title {
  font-size: 1rem;
  font-weight: 700;
  color: #374151;
  margin-bottom: 0.75rem;
}

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-list li {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.tag-count {
  font-size: 0.75rem;
  color: #6b7280;
}

a {
  color: #1d4ed8;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* 記事一覧 */
.post-list {
  list-style: none;
}

.post-list li {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.25rem 0;
  flex-wrap: wrap;
}

.post-list a {
  font-weight: 700;
}

.post-list time {
  font-size: 0.875rem;
  color: #6b7280;
  white-space: nowrap;
  flex-shrink: 0;
}

.tags {
  font-size: 0.75rem;
  color: #374151;
  background: #e5e7eb;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
}

/* 記事ヘッダー */
article header {
  display: block;
  margin-bottom: 1.5rem;
}

article header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin: 0.5rem 0 0.25rem;
}

.meta {
  font-size: 0.875rem;
  color: #374151;
  margin-top: 0.25rem;
}

.back-link {
  display: inline-block;
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

article footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid #e5e7eb;
}

/* 本文 */
.post-body h1,
.post-body h2 {
  margin: 1.5rem 0 0.5rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid #e5e7eb;
  font-weight: 600;
}

.post-body h1 { font-size: 1.5rem; }
.post-body h2 { font-size: 1.25rem; }

.post-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

.post-body p {
  margin: 0.75rem 0;
}

.post-body ul {
  list-style: disc;
  margin: 0.75rem 0 0.75rem 2rem;
}

.post-body ol {
  list-style: decimal;
  margin: 0.75rem 0 0.75rem 2rem;
}

.post-body li {
  margin: 0.25rem 0;
}

.post-body pre {
  background: #f3f4f6;
  border-radius: 4px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
  font-size: 0.875rem;
}

.post-body code {
  font-family: 'SFMono-Regular', Consolas, Menlo, monospace;
  font-size: 0.875em;
}

.post-body p code,
.post-body li code {
  background: #e5e7eb;
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

.post-body blockquote {
  border-left: 4px solid #d1d5db;
  margin: 1rem 0;
  padding: 0.25rem 1rem;
  color: #374151;
}

.post-body img {
  max-width: 100%;
  height: auto;
}

.post-body hr {
  border: none;
  border-top: 1px solid #e5e7eb;
  margin: 2rem 0;
}

.post-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
}

.post-body th,
.post-body td {
  border: 1px solid #d1d5db;
  padding: 0.4rem 0.75rem;
  text-align: left;
}

.post-body th {
  background: #f3f4f6;
  font-weight: 600;
}