.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s, border-color 0.3s;
}

main {
  margin-top: var(--nav-h);
}

section {
  padding: 80px 0;
}

section:nth-child(odd) {
  background: var(--bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-family: var(--font-headings);
  font-weight: 600;
  font-size: 2.5rem;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-header p {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* Responsive */
@media (max-width: 768px) {
  .section-header h2 {
    font-size: 2rem;
  }
  section {
    padding: 60px 0;
  }
}
@media (max-width: 480px) {
  .section-header h2 {
    font-size: 1.75rem;
  }
}