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

:root {
  --bg: #fafafa;
  --text: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --code-bg: #f3f4f6;
  --max-w: 640px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

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

/* Layout */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}
.site-header nav {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.site-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}
.site-title:hover {
  text-decoration: none;
}
.site-nav a {
  color: var(--muted);
  font-size: 14px;
  margin-left: 24px;
}
.site-nav a:hover {
  color: var(--text);
  text-decoration: none;
}

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 20px;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

/* Home - Post list */
.post-list {
  list-style: none;
}
.post-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.post-item:last-child {
  border-bottom: none;
}
.post-date {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 4px;
}
.post-link {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}
.post-link:hover {
  color: var(--accent);
  text-decoration: none;
}
.post-excerpt {
  margin-top: 8px;
  color: var(--muted);
  font-size: 15px;
}

/* Post */
.post-header {
  margin-bottom: 40px;
}
.post-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
}
.post-meta {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}
.post-content h2 {
  font-size: 24px;
  margin: 40px 0 16px;
}
.post-content h3 {
  font-size: 20px;
  margin: 32px 0 12px;
}
.post-content p {
  margin-bottom: 16px;
}
.post-content ul,
.post-content ol {
  margin: 0 0 16px 24px;
}
.post-content blockquote {
  border-left: 3px solid var(--border);
  padding-left: 16px;
  color: var(--muted);
  margin-bottom: 16px;
}
.post-content code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 14px;
}
.post-content pre {
  background: var(--code-bg);
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 16px;
}
.post-content pre code {
  background: none;
  padding: 0;
}
.post-content img {
  max-width: 100%;
  border-radius: 6px;
}

/* Hero */
.hero {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}
.hero-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 16px;
}
.hero-title {
  font-size: 24px;
  font-weight: 700;
}
.hero-desc {
  color: var(--muted);
  font-size: 15px;
  margin-top: 4px;
}

/* About */
.about-avatar {
  width: 160px;
  height: 160px;
  border-radius: 12px;
  object-fit: cover;
  margin-bottom: 24px;
}

/* Skill grid */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 16px;
}
.skill-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
}
.skill-card img {
  width: 36px;
  height: 36px;
}
.skill-card span {
  font-size: 13px;
  color: var(--muted);
}
@media (max-width: 480px) {
  .skill-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Page */
.page-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 32px;
}