:root {
  --bg: #fbfbfa;
  --fg: #24292f;
  --muted: #6b7280;
  --accent: #2563a8;
  --border: #e6e6e3;
  --code-bg: #f4f4f1;
  --card-bg: #ffffff;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: #fff;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 22px;
  padding-bottom: 22px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: inherit;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3a7bd5 0%, #00598a 55%, #1f3b57 100%);
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.5px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.15);
}

.brand-text .title {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  line-height: 1.2;
}

.brand-text .tagline {
  font-size: 13px;
  color: var(--muted);
  margin: 2px 0 0;
}

.site-nav {
  margin-left: auto;
  display: flex;
  gap: 20px;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}

.site-nav a:hover {
  color: var(--accent);
}

/* Main */
main {
  padding: 40px 0 60px;
}

.intro {
  margin-bottom: 36px;
}

.intro h1 {
  font-size: 28px;
  margin: 0 0 8px;
}

.intro p {
  color: var(--muted);
  margin: 0;
}

/* Post list cards */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px 24px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  border-color: #cfd6dd;
  box-shadow: 0 2px 10px rgba(20, 40, 60, 0.05);
}

.card .meta {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 6px;
  display: flex;
  gap: 10px;
  align-items: center;
}

.tag {
  display: inline-block;
  font-size: 12px;
  padding: 1px 9px;
  border-radius: 999px;
  background: #eef3f8;
  color: #2f5d80;
  font-weight: 500;
}

.card h2 {
  font-size: 20px;
  margin: 0 0 8px;
}

.card h2 a {
  color: var(--fg);
  text-decoration: none;
}

.card h2 a:hover {
  color: var(--accent);
}

.card .excerpt {
  margin: 0 0 12px;
  color: #404652;
  font-size: 16px;
}

.read-more {
  font-size: 14px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.read-more:hover {
  text-decoration: underline;
}

/* Article */
article {
  font-size: 17px;
}

article .post-meta {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 4px;
  display: flex;
  gap: 12px;
  align-items: center;
}

article h1 {
  font-size: 30px;
  line-height: 1.25;
  margin: 6px 0 26px;
}

article h2 {
  font-size: 22px;
  margin: 34px 0 12px;
}

article h3 {
  font-size: 18px;
  margin: 26px 0 10px;
}

article p {
  margin: 0 0 18px;
}

article ul,
article ol {
  margin: 0 0 18px;
  padding-left: 26px;
}

article li {
  margin-bottom: 6px;
}

article a {
  color: var(--accent);
}

blockquote {
  margin: 0 0 18px;
  padding: 4px 18px;
  border-left: 3px solid #cfd6dd;
  color: var(--muted);
}

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 5px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  margin: 0 0 20px;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
  font-size: 14px;
  color: #2b303a;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

.back-link {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
}

.back-link:hover {
  color: var(--accent);
}

/* About */
.about-card {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  margin-bottom: 28px;
}

.about-card .avatar-lg {
  width: 84px;
  height: 84px;
  border-radius: 16px;
  background: linear-gradient(135deg, #3a7bd5 0%, #00598a 55%, #1f3b57 100%);
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 30px;
  font-weight: 600;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
  padding: 24px 0;
  color: var(--muted);
  font-size: 13px;
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent);
}