body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f7f9fb;
    margin: 0;
    color: #222;
}
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}
header {
    background: #232946;
    color: #fff;
    padding: 20px 0;
    margin-bottom: 30px;
}
header h1 {
    margin: 0;
    font-size: 2rem;
}
nav a {
    color: #fff;
    margin-right: 20px;
    text-decoration: none;
    font-weight: 500;
}
nav a:hover {
    text-decoration: underline;
}
main.container {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    padding: 30px;
    min-height: 400px;
}
footer {
    background: #232946;
    color: #fff;
    text-align: center;
    padding: 15px 0;
    margin-top: 40px;
    border-radius: 0 0 8px 8px;
}
form {
    margin: 20px 0;
}
input, select, textarea {
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    width: 100%;
    box-sizing: border-box;
}
button, input[type="submit"] {
    background: #232946;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}
button:hover, input[type="submit"]:hover {
    background: #3949ab;
}
.alert {
    background: #ffe082;
    color: #333;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
}
.success {
    background: #c8e6c9;
    color: #256029;
}
.error {
    background: #ffcdd2;
    color: #b71c1c;
}
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}
.table th, .table td {
    border: 1px solid #e0e0e0;
    padding: 10px;
    text-align: left;
}
.table th {
    background: #f5f5f5;
}