:root {
  --bg-color: #ffffff;
  --text-color: #111111;
  --link-color: #000000;
  --hover-color: #666666;
  --border-color: #e5e5e5;
  --meta-color: #666666;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  --font-serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #111111;
    --text-color: #eeeeee;
    --link-color: #ffffff;
    --hover-color: #aaaaaa;
    --border-color: #333333;
    --meta-color: #999999;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-serif);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  font-size: 19px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  line-height: 1.2;
  margin-top: 2em;
  margin-bottom: 0.5em;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; }

a {
  color: var(--link-color);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--hover-color);
  text-decoration-thickness: 2px;
}

header.site-header {
  border-bottom: 1px solid var(--border-color);
  padding: 2rem 0;
  margin-bottom: 4rem;
  font-family: var(--font-sans);
}

.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1rem;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-color);
  text-decoration: none;
  letter-spacing: -0.04em;
  text-transform: lowercase;
}

.site-title:hover {
  text-decoration: none;
  color: var(--hover-color);
}

.nav-links a {
  margin-left: 1.5rem;
  font-weight: 500;
  color: var(--meta-color);
  text-decoration: none;
}

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

main.page-content {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Post List */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-item {
  margin-bottom: 4rem;
}

.post-item h2 {
  margin: 0 0 0.5rem 0;
}

.post-item h2 a {
  color: var(--text-color);
  text-decoration: none;
}

.post-item h2 a:hover {
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

.post-meta {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--meta-color);
  margin-bottom: 1rem;
  display: block;
}

.post-excerpt {
  margin: 0;
  color: var(--text-color);
}

/* Single Post */
.post-header {
  margin-bottom: 3rem;
}

.post-header h1 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.post-content {
  margin-bottom: 4rem;
}

.post-content p {
  margin-bottom: 1.5em;
}

.post-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2rem auto;
  border-radius: 4px;
}

.post-content blockquote {
  border-left: 4px solid var(--text-color);
  margin: 2rem 0;
  padding-left: 1.5rem;
  font-style: italic;
  font-size: 1.1em;
  color: var(--meta-color);
}

.post-content pre {
  background: var(--border-color);
  padding: 1rem;
  overflow-x: auto;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.85rem;
  margin-bottom: 1.5em;
}

.post-content code {
  background: var(--border-color);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-family: inherit;
  font-size: 0.85em;
}

.post-content pre code {
  background: none;
  padding: 0;
  font-size: 1em;
}

/* Footer */
footer.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  margin-top: 5rem;
  text-align: center;
  font-family: var(--font-sans);
  color: var(--meta-color);
  font-size: 0.9rem;
}

.hero {
  margin-bottom: 3rem;
  padding: 2.25rem;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  background:
    radial-gradient(circle at 10% 10%, rgba(0, 0, 0, 0.04), transparent 40%),
    linear-gradient(135deg, rgba(0, 0, 0, 0.03), transparent 60%);
}

.hero-kicker {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--meta-color);
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  margin-top: 0.7rem;
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.hero p {
  font-size: 1.1rem;
  color: var(--meta-color);
  max-width: 60ch;
  font-family: var(--font-sans);
  margin-top: 1rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.62rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border-color);
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.btn-primary {
  background-color: var(--text-color);
  color: var(--bg-color);
  border-color: var(--text-color);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--text-color);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-color);
}

.btn-secondary:hover {
  border-color: var(--text-color);
}

.home-highlights {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 4rem;
}

.highlight {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.1rem;
  background: color-mix(in srgb, var(--bg-color) 94%, var(--text-color));
}

.highlight h2 {
  margin: 0;
  font-size: 1.1rem;
}

.highlight p {
  margin: 0.5rem 0 0;
  color: var(--meta-color);
  font-family: var(--font-sans);
  font-size: 0.96rem;
}

@media (max-width: 768px) {
  body {
    font-size: 17px;
  }

  header.site-header {
    padding: 1.2rem 0;
    margin-bottom: 2rem;
  }

  .site-nav {
    align-items: center;
  }

  .site-title {
    font-size: 1.25rem;
  }

  .nav-links a {
    margin-left: 1rem;
    font-size: 0.95rem;
  }

  .hero {
    padding: 1.25rem;
    border-radius: 10px;
    margin-bottom: 1.8rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .home-highlights {
    grid-template-columns: 1fr;
    gap: 0.7rem;
    margin-bottom: 2.2rem;
  }

  .post-item {
    margin-bottom: 2.2rem;
  }

  footer.site-footer {
    margin-top: 3rem;
    padding: 2rem 0;
  }
}