* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #0f172a;
  color: #e5e7eb;
  line-height: 1.7;
}

a {
  color: #dbeafe;
  text-decoration: none;
  margin-left: 18px;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 8%;
  background: rgba(2, 6, 23, 0.85);
}

.logo {
  font-weight: bold;
  font-size: 20px;
  color: #ffffff;
}

.hero {
  background: linear-gradient(135deg, #1d4ed8, #6d28d9, #111827);
  min-height: 520px;
}

.hero-content {
  max-width: 950px;
  padding: 90px 8%;
}

.hero h1 {
  font-size: 54px;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero p {
  font-size: 21px;
  max-width: 780px;
}

.btn {
  display: inline-block;
  margin-top: 25px;
  background: #38bdf8;
  color: #020617;
  padding: 14px 24px;
  border-radius: 8px;
  font-weight: bold;
}

main {
  max-width: 1200px;
  margin: auto;
  padding: 45px 20px;
}

.section {
  background: #111827;
  padding: 35px;
  border-radius: 14px;
  margin-bottom: 28px;
  border: 1px solid #1f2937;
}

.section.dark {
  background: #020617;
}

h2 {
  color: #60a5fa;
  font-size: 32px;
}

h3 {
  color: #93c5fd;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
  margin-bottom: 28px;
}

.card {
  background: #1e293b;
  padding: 25px;
  border-radius: 12px;
  border-left: 5px solid #38bdf8;
}

ul {
  padding-left: 22px;
}

footer {
  text-align: center;
  background: #020617;
  color: #94a3b8;
  padding: 28px;
}