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

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent-dim: #388bfd;
  --border: #30363d;
}

html {
  scroll-behavior: smooth;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--text-primary);
}

/* Header */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

nav {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  gap: 2rem;
  justify-content: center;
}

nav a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

nav a:hover {
  color: var(--text-primary);
}

/* Main */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 0;
}

h1 {
  font-size: 3rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 4rem;
}

.tagline {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* About */
#about p {
  color: var(--text-secondary);
  max-width: 600px;
  font-size: 1.1rem;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.skill-category {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.skill-category ul {
  list-style: none;
}

.skill-category li {
  color: var(--text-secondary);
  padding: 0.25rem 0;
  font-size: 0.95rem;
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.project {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}

.project:hover {
  border-color: var(--accent-dim);
}

.project p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

/* Contact */
#contact {
  text-align: center;
  padding-bottom: 4rem;
}

#contact p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.contact-links {
  display: flex;
  gap: 2rem;
  justify-content: center;
}

.contact-links a {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  transition: all 0.2s;
}

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

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 600px) {
  h1 {
    font-size: 2.25rem;
  }
  
  .tagline {
    font-size: 1rem;
  }
  
  nav {
    gap: 1rem;
  }
  
  section {
    padding: 3rem 0;
  }
}