:root {
  --bg: #fafaf8;
  --bg-alt: #ffffff;
  --text: #1c1c1c;
  --text-muted: #5a5a5a;
  --accent: #2a6f77;
  --border: #e2e0da;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #16181a;
    --bg-alt: #1e2124;
    --text: #edecea;
    --text-muted: #a8a8a8;
    --accent: #6fd0da;
    --border: #33383c;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #16181a;
  --bg-alt: #1e2124;
  --text: #edecea;
  --text-muted: #a8a8a8;
  --accent: #6fd0da;
  --border: #33383c;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

main, header, footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

.site-header {
  text-align: center;
  position: relative;
  padding-top: 3rem;
}

.theme-toggle {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  width: 2.5rem;
  height: 2.5rem;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text);
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.headshot {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--card-shadow);
  margin-bottom: 1rem;
}

.site-header h1 {
  margin: 0.25rem 0 0;
  font-size: 1.9rem;
}

.subtitle {
  margin: 0.2rem 0;
  font-size: 1.15rem;
  color: var(--accent);
  font-weight: 600;
}

.location {
  margin: 0.2rem 0 1rem;
  color: var(--text-muted);
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.25rem;
}

.links a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.links a:hover {
  border-bottom-color: var(--accent);
}

h2 {
  font-size: 1.4rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4rem;
}

.section-intro {
  color: var(--text-muted);
  margin-top: -0.4rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.project-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.15rem;
  box-shadow: var(--card-shadow);
}

.project-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.project-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.site-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
}

.site-footer .links {
  margin-bottom: 0.75rem;
}

.copyright {
  margin: 0;
}

@media (max-width: 650px) {
  .site-header {
    padding-top: 3.5rem;
  }

  .headshot {
    width: 120px;
    height: 120px;
  }
}