* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background: linear-gradient(180deg, #020617, #020617);
  color: #e5e7eb;
}

header {
  padding: 20px;
  text-align: center;
  background: #020617;
  border-bottom: 1px solid #0f172a;
}

header h1 {
  color: #38bdf8;
  margin-bottom: 10px;
}

nav a {
  color: #e5e7eb;
  margin: 0 10px;
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  color: #38bdf8;
}

section {
  max-width: 1100px;
  margin: 40px auto;
  padding: 0 20px;
}

.hero {
  background: #020617;
  padding: 30px;
  border-radius: 12px;
  border: 1px solid #0f172a;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.card {
  background: #020617;
  border: 1px solid #0f172a;
  border-radius: 14px;
  padding: 20px;
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  border-color: #38bdf8;
}

.card h3 {
  margin-bottom: 10px;
  color: #38bdf8;
}

.card p {
  font-size: 14px;
  line-height: 1.6;
}

.copy-btn {
  margin-top: 15px;
  background: #38bdf8;
  color: #020617;
  border: none;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
}

.copy-btn:hover {
  background: #0ea5e9;
}

.ad-box {
  grid-column: 1 / -1;
  background: #020617;
  border: 1px dashed #334155;
  text-align: center;
  padding: 30px;
  border-radius: 12px;
  color: #94a3b8;
}

footer {
  margin-top: 60px;
  padding: 20px;
  text-align: center;
  border-top: 1px solid #0f172a;
  color: #94a3b8;
}