* { box-sizing: border-box; }

:root {
  --max: 1100px;
  --pad: 20px;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.5;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* Header / Nav */
.site-header {
  border-bottom: 1px solid #e5e5e5;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.logo {
  font-weight: 700;
  text-decoration: none;
  color: inherit;
}

.nav-links {
  display: flex;
  gap: 16px;
}

.nav-links a {
  text-decoration: none;
  color: inherit;
}

/* Hero */
.hero {
  padding: 56px 0;
  text-align: center;
}

.btn {
  padding: 10px 14px;
  border: 0;
  cursor: pointer;
}

/* Cards */
.features {
  padding: 40px 0;
}

.cards {
  display: flex;
  gap: 16px;
  margin-top: 16px;
}

.card {
  flex: 1;
  border: 1px solid #e5e5e5;
  padding: 16px;
  border-radius: 12px;
}

/* Footer */
.site-footer {
  border-top: 1px solid #e5e5e5;
  padding: 18px 0;
  margin-top: 40px;
}

/* Responsive */
@media (max-width: 768px) {
  .cards { flex-direction: column; }
  .nav { flex-direction: column; gap: 12px; }
}