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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  font-size: 17px;
  line-height: 1.75;
  color: #1a1a1a;
  background: #fff;
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }

header { margin-bottom: 56px; }
header a { font-size: 17px; letter-spacing: 0.01em; }

h1.site-title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* Index */
.post-list { list-style: none; }
.post-list li {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid #f0f0f0;
}
.post-list li:first-child { border-top: 1px solid #f0f0f0; }
.post-date {
  font-size: 13px;
  color: #999;
  white-space: nowrap;
  min-width: 90px;
}
.post-title {
  font-size: 16px;
  color: #1a1a1a;
}
.post-title:hover { text-decoration: underline; }

/* Article */
article header { margin-bottom: 40px; }
article h1 {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 10px;
}
.article-date {
  font-size: 13px;
  color: #999;
}

.article-body { line-height: 1.8; }
.article-body p { margin: 1em 0; }
.article-body h2, .article-body h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 2em 0 0.75em;
}
.article-body ul, .article-body ol {
  margin: 1em 0 1em 1.5em;
}
.article-body li { margin: 0.4em 0; }
.article-body blockquote {
  border-left: 3px solid #e0e0e0;
  padding-left: 16px;
  color: #666;
  margin: 1.5em 0;
}
.article-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5em 0;
  border-radius: 4px;
}
.article-body strong, .article-body b { font-weight: 600; }
.article-body em, .article-body i { font-style: italic; }

.back {
  display: inline-block;
  font-size: 14px;
  color: #999;
  margin-top: 48px;
}
.back:hover { color: #1a1a1a; text-decoration: none; }