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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

header {
    background: #1f6f8b;
    color: white;
    padding: 20px;
    text-align: center;
}

nav {
    background: #164e63;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 15px 20px;
    display: block;
}

nav a:hover {
    background: #28a745;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: auto;
    padding: 5px 0;
}

.card {
    background: white;
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

button {
    background: #28a745;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: #218838;
}

footer {
    background: #1f6f8b;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
    }
}