* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f4f6f8;
  color: #222;
  line-height: 1.8;
}

header {
  background: linear-gradient(135deg, #111827, #1f2933);
  padding: 20px;
}

header nav {
  max-width: 1100px;
  margin: auto;
}

header nav a {
  color: #fff;
  margin-right: 20px;
  text-decoration: none;
  font-weight: 600;
}

header nav a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1100px;
  margin: 40px auto;
  padding: 40px;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

h1 {
  font-size: 2.4rem;
  margin-bottom: 20px;
}

h2 {
  font-size: 1.6rem;
  margin-top: 30px;
  margin-bottom: 15px;
}

h3 {
  margin-top: 20px;
}

p {
  margin-bottom: 16px;
}

ul {
  margin-left: 20px;
  margin-bottom: 20px;
}

li {
  margin-bottom: 10px;
}

a {
  color: #2563eb;
}

footer {
  text-align: center;
  padding: 30px;
  margin-top: 60px;
  background: #111827;
  color: #fff;
}