body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: #ffffff;
  color: #0f172a;
  line-height: 1.6;
}

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

nav {
  background: #0f172a;
  padding: 18px 8%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .logo {
  color: #38bdf8;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 2px;
}

nav a {
  color: #e5e7eb;
  margin-left: 20px;
  font-weight: 600;
}

.hero {
  padding: 100px 8%;
  background: linear-gradient(135deg, #020617, #111827);
  color: white;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 12px;
}

.hero p {
  max-width: 700px;
  font-size: 1.2rem;
  color: #cbd5e1;
}

.section {
  padding: 70px 8%;
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 25px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 26px;
}

.card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 26px;
}

.card h3 {
  margin-top: 0;
}

.dark {
  background: #0f172a;
  color: white;
}

.dark p, .dark h2, .dark h3, .dark li {
  color: #e2e8f0;
}

.cta-button {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 24px;
  background: #0f766e;
  color: white;
  border-radius: 8px;
  font-weight: 600;
}

.cta-button:hover {
  background: #134e4a;
}

footer {
  background: #020617;
  padding: 40px 8%;
  color: #cbd5e1;
  margin-top: 60px;
}

footer h3 {
  color: #38bdf8;
}