:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #5b6470;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --card: #f6f7f9;
  --border: #e5e7eb;
  --max: 960px;
  --radius: 12px;
}

[data-theme="dark"] {
  --bg: #0b0d12;
  --fg: #e7ebf0;
  --muted: #9aa3b2;
  --accent: #60a5fa;
  --accent-fg: #0b0d12;
  --card: #141821;
  --border: #232936;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

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

.nav nav {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.nav nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

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

#theme-toggle {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  border-radius: 999px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  font-size: 1rem;
}

main { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

.hero { padding: 5rem 0 3rem; }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 1.25rem;
  color: var(--muted);
  margin: 0 0 1.25rem;
}

.lede {
  font-size: 1.05rem;
  max-width: 60ch;
  margin: 0 0 2rem;
}

.cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.7rem 1.1rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.05s ease, background 0.15s ease;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
}

.btn-ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}

.btn-ghost:hover { background: var(--card); }

.section { padding: 3rem 0; border-top: 1px solid var(--border); }

.section h2 {
  font-size: 1.5rem;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}

.skills {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skills li {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--muted);
}

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

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.card h3 { margin: 0 0 0.5rem; font-size: 1.1rem; }

.card p { margin: 0 0 1rem; color: var(--muted); font-size: 0.95rem; }

.card-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.contact-list a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.contact-list a:hover { text-decoration: underline; }

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

@media (max-width: 540px) {
  .nav nav a { display: none; }
  .nav nav #theme-toggle { display: inline-block; }
}