* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", 
sans-serif;
  background: #0f172a;
  color: #e5e7eb;
}

a {
  color: #38bdf8;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #1f2937;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1rem;
}

.logo {
  margin: 0;
  font-size: 1.4rem;
}

.nav {
  display: flex;
  gap: 1rem;
  font-size: 0.95rem;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
}

.section {
  padding: 3rem 1rem;
}

.section.alt {
  background: #020617;
}

.section h2 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.8rem;
}

.hero {
  text-align: left;
}

.hero h2 {
  font-size: 2.2rem;
}

.hero-buttons {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  background: #38bdf8;
  color: #020617;
  font-weight: 600;
  border: none;
}

.btn.secondary {
  background: transparent;
  border: 1px solid #38bdf8;
  color: #e5e7eb;
}

.btn:hover {
  filter: brightness(1.1);
  text-decoration: none;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.card {
  background: #020617;
  border-radius: 0.75rem;
  padding: 1.25rem;
  border: 1px solid #1e293b;
}

.card h3 {
  margin-top: 0;
}

.site-footer {
  border-top: 1px solid #1f2937;
  padding: 1rem 0;
  text-align: center;
  font-size: 0.85rem;
  color: #9ca3af;
}

/* Mobile tweaks */
@media (max-width: 640px) {
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .nav {
    flex-wrap: wrap;
  }
}