body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    margin: 0;
    padding: 0;
    color: #333;
}

header {
    background-color: #2b2d42;
    color: white;
    padding: 20px;
    text-align: center;
}

nav {
    background-color: #8d99ae;
    padding: 10px;
    text-align: center;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
}

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

.container {
    max-width: 900px;
    margin: 30px auto;
    background-color: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
}

h1, h2, h3 {
    color: #2b2d42;
}

input, select, button {
    padding: 10px;
    margin: 10px 5px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

button {
    background-color: #2b2d42;
    color: white;
    font-weight: bold;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #1d1f31;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table, th, td {
    border: 1px solid #ccc;
}

th, td {
    padding: 12px;
    text-align: center;
}

th {
    background-color: #edf2f4;
    color: #2b2d42;
}