:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #2563eb;
  --alt-bg: #f5f7fb;
  --border: #e5e7eb;
}

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

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.hero {
  background: linear-gradient(135deg, #eef2ff 0%, #e0f2fe 100%);
  padding-bottom: 4rem;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--fg);
}

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

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

.hero-content {
  text-align: center;
  padding: 4rem 1.5rem 2rem;
  max-width: 700px;
  margin: 0 auto;
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 1rem;
}

.hero-content p {
  color: var(--muted);
  margin-bottom: 2rem;
  font-size: 1.125rem;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1.75rem;
  border-radius: 6px;
  font-weight: 500;
}

.btn:hover { background: #1d4ed8; text-decoration: none; }

.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.section-alt {
  background: var(--alt-bg);
  max-width: none;
}

.section-alt > * {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.section h2 {
  font-size: 1.875rem;
  margin-bottom: 1.5rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
}

.card h3 { margin-bottom: 0.5rem; }
.card p { color: var(--muted); }

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

@media (max-width: 600px) {
  .nav { flex-direction: column; gap: 0.75rem; }
  .nav-links { gap: 1rem; }
}