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

:root {
  --bg:        #0f1117;
  --surface:   #161b22;
  --border:    #21262d;
  --text:      #e6edf3;
  --muted:     #7d8590;
  --accent:    #58a6ff;
  --green:     #3fb950;
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Sections ────────────────────────────────────────── */

section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--border);
}

section:last-child {
  border-bottom: none;
}

h2 {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

p {
  color: var(--muted);
  max-width: 60ch;
}

p + p {
  margin-top: 1rem;
}

/* ── Hero ────────────────────────────────────────────── */

.hero {
  padding: 6rem 0 4rem;
  border-bottom: 1px solid var(--border);
}

.prompt {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  max-width: none;
  color: var(--muted);
}

.prompt .user  { color: var(--green); }
.prompt .at    { color: var(--muted); }
.prompt .host  { color: var(--accent); }
.prompt .symbol { color: var(--muted); }

.hero h1 {
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 1rem;
  color: var(--muted);
  margin-bottom: 2rem;
  max-width: none;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.hero-links a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}

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

/* ── Skills ──────────────────────────────────────────── */

.skill-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
}

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

.skill-group li {
  font-size: 0.9rem;
  color: var(--muted);
  padding: 0.25rem 0;
  border-bottom: 1px solid var(--border);
}

.skill-group li:last-child {
  border-bottom: none;
}

/* ── Homelab ─────────────────────────────────────────── */

.section-intro {
  margin-bottom: 2rem;
}

.nodes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.node {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem;
}

.node-header {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.node-name {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--green);
}

.node-os {
  font-size: 0.75rem;
  color: var(--muted);
}

.node-desc {
  font-size: 0.85rem;
  margin-bottom: 1rem;
  max-width: none;
}

.service-list {
  list-style: none;
}

.service-list li {
  font-size: 0.82rem;
  color: var(--muted);
  padding: 0.2rem 0;
  padding-left: 0.75rem;
  position: relative;
}

.service-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--border);
}

/* ── Contact ─────────────────────────────────────────── */

.contact p {
  margin-bottom: 1.25rem;
}

.contact-link {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.contact-link:hover {
  border-bottom-color: var(--accent);
}

/* ── Footer ──────────────────────────────────────────── */

footer {
  padding: 2rem 0;
  text-align: center;
}

footer p {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--border);
  max-width: none;
  text-align: center;
}

/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 480px) {
  .hero {
    padding: 4rem 0 3rem;
  }

  .skill-groups {
    grid-template-columns: 1fr;
  }

  .nodes {
    grid-template-columns: 1fr;
  }
}