:root {
  --bg: #0a0e14;
  --bg-alt: #10151f;
  --fg: #c9d1d9;
  --fg-dim: #8b949e;
  --accent: #00e0a4;
  --accent-dim: #0a5c46;
  --border: #1e2530;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 224, 164, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 224, 164, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -1;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 100%);
}

a { color: inherit; text-decoration: none; }

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 3rem;
  max-width: 1100px;
  margin: 0 auto;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.nav-links { display: flex; gap: 2rem; font-size: 0.9rem; }

.nav-links a {
  color: var(--fg-dim);
  transition: color 0.2s;
}

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

.hero {
  min-height: 90vh;
  display: flex;
  flex-direction: column;
}

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 3rem;
}

.hero-tag {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.hero-sub {
  color: var(--fg-dim);
  font-size: clamp(1rem, 2vw, 1.25rem);
  max-width: 32ch;
  margin-bottom: 2.5rem;
}

.hero-links { display: flex; gap: 1rem; }

.btn {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.85rem 1.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: #06140f;
  border-color: var(--accent);
}

.btn-primary:hover {
  box-shadow: 0 0 24px rgba(0, 224, 164, 0.35);
  transform: translateY(-2px);
}

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

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 6rem 3rem;
}

.section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 2rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.section-index {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 1.1rem;
}

.section-body p {
  color: var(--fg-dim);
  max-width: 65ch;
  font-size: 1.05rem;
}

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

.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-4px);
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.6rem;
}

.card p {
  color: var(--fg-dim);
  font-size: 0.95rem;
  margin-bottom: 1.1rem;
}

.tags { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.tags span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: rgba(0, 224, 164, 0.08);
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
}

.contact-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 1rem;
  font-family: var(--font-mono);
}

.contact-links a {
  color: var(--fg);
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
  transition: color 0.2s, border-color 0.2s;
}

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

.footer {
  text-align: center;
  padding: 2.5rem 0;
  color: var(--fg-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
  .nav { padding: 1.25rem 1.5rem; }
  .nav-links { gap: 1.25rem; font-size: 0.8rem; }
  .hero-content { padding: 2rem 1.5rem; }
  .section { padding: 4rem 1.5rem; }
}