* {
  box-sizing: border-box;
  font-family: "Segoe UI", Arial, sans-serif;
}

body {
  margin: 0;
  background: #0f172a;
  color: #e5e7eb;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background: #020617;
  border-bottom: 1px solid #1e293b;
}

header img {
  height: 40px;
}

header a {
  color: #93c5fd;
  text-decoration: none;
  font-weight: 600;
}

main {
  max-width: 900px;
  margin: 60px auto;
  padding: 0 20px;
}

.card {
  background: #020617;
  border-radius: 14px;
  padding: 40px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

h1 {
  margin-top: 0;
  font-size: 2.2em;
}

ol li {
  margin-bottom: 12px;
}

.btn {
  display: inline-block;
  margin-top: 25px;
  padding: 14px 28px;
  background: #2563eb;
  color: white;
  text-decoration: none;
  border-radius: 10px;
  font-size: 1.1em;
}

.btn:hover {
  background: #1d4ed8;
}

footer {
  text-align: center;
  margin: 60px 0 30px;
  color: #9ca3af;
  font-size: 0.9em;
}