body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #fafafa;
  color: #222;
  line-height: 1.6;
}

/* HEADER */
header {
  text-align: center;
  background: #0c2b4a;
  color: #fff;
  padding: 20px 10px;
}

.logo-main {
  display: block;
  margin: 10px auto;
  max-width: 260px;
  height: auto;
}

/* NAVIGATION */
nav {
  background: #123b63;
  padding: 10px;
  text-align: center;
}

nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
  font-weight: bold;
  display: inline-block;
}

/* BANNER */
.banner-container {
  width: 100%;
  display: flex;
  justify-content: center;
  margin: 0 auto;
  padding: 0;
}

.banner-center {
  width: 100%;
  max-width: 600px;
  height: auto;
  display: block;
}

/* SECTIONS */
section {
  max-width: 900px;
  background: white;
  margin: 10px auto;
  padding: 15px;
  border-radius: 10px;
}

h1, h2 {
  color: #0c2b4a;
}

/* BUTTON */
.btn {
  display: inline-block;
  margin-top: 15px;
  padding: 12px 20px;
  background: #0066ff;
  color: white;
  text-decoration: none;
  border-radius: 6px;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 20px;
  color: #777;
}

/* MOBILE FIX */
@media (max-width: 600px) {
  header {
    padding: 15px 5px;
  }
  .logo-main {
    max-width: 180px;
  }
  header h1 {
    font-size: 18px;
  }
  nav a {
    margin: 3px 6px;
    font-size: 13px;
  }
}