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

body {
  font-family: "Segoe UI", sans-serif;
  color: #222;
  line-height: 1.6;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
}

header {
  background: #004080;
  padding: 20px 0;
}

.logo {
  height: 50px;
  vertical-align: middle;
}

nav {
  float: right;
  margin-top: 10px;
}

nav a {
  color: white;
  margin-left: 20px;
  text-decoration: none;
  font-weight: bold;
}

.hero {
  background: #e6f2ff;
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 3em;
  color: #004080;
}

.cta-button {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 24px;
  background-color: #004080;
  color: white;
  text-decoration: none;
  border-radius: 6px;
}

#features,
#contact {
  padding: 60px 0;
}

#features ul {
  list-style: none;
  padding-left: 0;
}

#features li {
  margin-bottom: 10px;
  font-size: 1.2em;
}

footer {
  background: #004080;
  color: white;
  text-align: center;
  padding: 20px 0;
  margin-top: 40px;
}
:root[data-theme='light'] {
  --bg-color: #ffffff;
  --text-color: #000000;
}

:root[data-theme='dark'] {
  --bg-color: #121212;
  --text-color: #ffffff;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
}