:root {
  --fg: #1a1a1a;
  --fg-muted: #555;
  --bg: #fafafa;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --border: #e5e5e5;
  --tag-bg: #eef2f7;
  --tag-fg: #444;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8e8e8;
    --fg-muted: #a8a8a8;
    --bg: #0d1117;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --border: #30363d;
    --tag-bg: #21262d;
    --tag-fg: #c9d1d9;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
}

.avatar {
  display: block;
  margin: 0 auto 1rem;
  border-radius: 50%;
  border: 2px solid var(--border);
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.25rem;
  font-weight: 600;
}

.tagline {
  color: var(--fg-muted);
  margin: 0;
  font-size: 1rem;
}

section {
  margin-bottom: 2.5rem;
}

h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

p {
  margin: 0 0 1rem;
}

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

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

ul {
  margin: 0;
  padding-left: 1.25rem;
}

ul li {
  margin-bottom: 0.4rem;
}

ul.projects {
  list-style: none;
  padding-left: 0;
}

ul.projects > li {
  margin-bottom: 1.5rem;
}

ul.projects > li p {
  margin: 0.4rem 0 0;
  color: var(--fg-muted);
  font-size: 0.95rem;
}

.tag {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.1rem 0.5rem;
  background: var(--tag-bg);
  color: var(--tag-fg);
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 500;
  vertical-align: middle;
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

ul.contact {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

ul.contact li {
  margin: 0;
}

@media (max-width: 480px) {
  main {
    padding: 2rem 1rem 3rem;
  }
  h1 {
    font-size: 1.5rem;
  }
  ul.contact {
    flex-direction: column;
    gap: 0.5rem;
  }
}