:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #5a5a5a;
  --color-accent: #2563eb;
  --color-accent-contrast: #ffffff;
  --color-border: #e5e5e5;
  --color-card-bg: #f7f7f8;
  --max-width: 960px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #12141a;
    --color-text: #eaeaea;
    --color-muted: #a3a3a3;
    --color-accent: #5b8def;
    --color-accent-contrast: #0b0d12;
    --color-border: #2a2d35;
    --color-card-bg: #1a1d24;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

h1, h2, h3 {
  line-height: 1.2;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}

.brand {
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text);
}

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

.hero {
  padding: 5rem 1.5rem 4rem;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.tagline {
  color: var(--color-muted);
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

.button {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
}

.section {
  padding: 3rem 1.5rem;
  border-top: 1px solid var(--color-border);
}

.skills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin-top: 1.5rem;
}

.skills li {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.35rem 1rem;
  font-size: 0.9rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.project-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

.project-card h3 {
  margin-top: 0;
}

.project-tech {
  color: var(--color-muted);
  font-size: 0.85rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.footer-note {
  margin-top: 0.25rem;
}