:root {
  --accent: #0077cc;
  --bg: #ffffff;
  --text: #333333;
  --footer-bg: #222;
  --footer-text: #ffffff;
}
body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  scroll-behavior: smooth;
}
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1rem;
}
header {
  background: var(--bg);
  border-bottom: 1px solid #eee;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: nowrap;
}
header .container {
  padding: 1rem 0;
}
.logo { font-weight: 700; }
nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0; padding: 0;
}
nav a, nav button {
  background: none; border: none;
  font: inherit; color: inherit;
  cursor: pointer; text-decoration: none;
}
#hero {
  text-align: center;
  padding: 6rem 1rem 4rem;
}
#hero h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}
#hero .tagline {
  font-size: 1.1rem;
  color: #666;
  max-width: 600px;
  margin: 0 auto 1.5rem;
}
.hero-highlights {
  list-style: disc inside;
  margin: 1rem auto 2rem;
  padding: 0;
  max-width: 500px;
  text-align: left;
}
.hero-highlights li {
  margin: 0.25rem 0;
}
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: #fff;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
}
section { padding: 4rem 0; }
#projects .project { margin-bottom: 3rem; }
.case-link { font-weight: 600; }
.highlights {
  list-style: disc inside;
  margin: 1.5rem 0;
}
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  text-align: center;
  padding: 3rem 1rem;
}
footer a {
  color: inherit;
  text-decoration: underline;
}
body.dark {
  --bg: #0d1117;
  --text: #e6edf3;
  --accent: #58a6ff;
  --footer-bg: #161b22;
  --footer-text: #e6edf3;
}