:root {
  --dark-color: #004080;
  --light-color: #fff;
  --secondary-color: #222;
  --text-color: #333;
  --primary-color: #d00;
}

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

body {
  font-family: Arial, sans-serif;
  background: #f0f0f0;
  color: var(--text-color);
}

header {
  background: var(--light-color);
  padding: 20px;
  border-bottom: 3px solid #444;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header img {
  max-width: 150px;
}

nav {
  display: flex;
  gap: 15px;
}

nav a {
  color: var(--light-color);
  background: var(--secondary-color);
  text-decoration: none;
  padding: 10px 15px;
  border-radius: 5px;
  transition: background 0.3s ease;
}

nav a:hover {
  background: #444;
}

.container {
  max-width: 500px;
  margin: 20px auto;
  background: var(--light-color);
  padding: 30px;
  border-radius: 5px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

form {
  display: flex;
  flex-direction: column;
}

label {
  font-size: 18px;
  margin-bottom: 5px;
}

input {
  width: 100%;
  padding: 10px;
  font-size: 16px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

button {
  background: var(--primary-color);
  color: var(--light-color);
  border: none;
  padding: 12px;
  font-size: 18px;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background: #a00;
}

footer {
  background: var(--dark-color);
  padding: 20px;
  border-top: 3px solid #444;
  text-align: center;
  color: var(--light-color);
  font-size: 14px;
}

@media (max-width: 768px) {
  nav {
    flex-direction: column;
    align-items: center;
  }
}