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

html {
  font-size: 18px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: system-ui, Georgia, "Times New Roman", serif;
  line-height: 1.6;
  color: #1a1a1a;
  background: #fff;
}

a {
  color: #1a1a1a;
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  color: #444;
}

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

.site-wrapper {
  max-width: 680px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #e5e5e5;
}

.site-name {
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  gap: 1.25rem;
}

.site-nav a {
  text-decoration: none;
  font-size: 0.95rem;
}

.site-nav a:hover {
  text-decoration: underline;
}

.hero {
  margin-bottom: 2.5rem;
}

.hero h1 {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0;
  font-size: 1.05rem;
  color: #444;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1.25rem;
  letter-spacing: -0.01em;
}

.article-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.article-card {
  padding: 1.25rem 0;
  border-top: 1px solid #e5e5e5;
}

.article-card:first-child {
  border-top: none;
  padding-top: 0;
}

.article-card h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
  line-height: 1.35;
}

.article-card h2 a {
  text-decoration: none;
}

.article-card h2 a:hover {
  text-decoration: underline;
}

.article-meta {
  font-size: 0.85rem;
  color: #666;
  margin: 0 0 0.5rem;
}

.article-excerpt {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  color: #333;
}

.read-more {
  display: inline-block;
  padding: 0.45rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  color: #fff;
  background: #1a1a1a;
  border-radius: 4px;
}

.read-more:hover {
  color: #fff;
  background: #444;
}

.article-page h1 {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.article-page .article-meta {
  margin-bottom: 1.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid #e5e5e5;
}

.article-body h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  letter-spacing: -0.01em;
}

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

.article-body p {
  margin: 0 0 1.25rem;
}

.article-body p:last-child {
  margin-bottom: 0;
}

.about-page h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0 0 1.5rem;
  letter-spacing: -0.02em;
}

.about-portrait {
  margin: 0 0 1.75rem;
  text-align: center;
}

.about-portrait img {
  display: block;
  width: 280px;
  height: 280px;
  margin: 0 auto;
  border-radius: 50%;
  object-fit: cover;
}

.about-portrait figcaption {
  margin-top: 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #333;
}

.about-page p {
  margin: 0 0 1.25rem;
}

.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e5e5e5;
  font-size: 0.85rem;
  color: #666;
}

.site-footer p {
  margin: 0;
}