body {
    font-family: Tahoma, sans-serif;
    margin: 0;
    background-color: #f5f5f5;
    color: #333;
}
.header {
    background-color: #2d3e50;
    color: #fff;
    padding: 15px 0;
}
.footer {
    text-align: center; 
    margin-top: 10px; 
    padding: 20px; 
    font-size: 14px; 
    color: #777;
}
.container {
    width: 90%;
    max-width: 960px;
    margin: auto;
}
nav a {
    color: white;
    margin-right: 15px;
    text-decoration: none;
}
nav a:hover {
    text-decoration: underline;
}
main {
    padding: 20px 0;
}

/* Error Page Styles */
.error-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
    background: #f8f9fa;
    padding: 40px 20px;
    text-align: center;
}

.error-container {
    background: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

.error-container h1 {
    font-size: 96px;
    margin-bottom: 20px;
    color: #dc3545;
}

.error-container h2 {
    font-size: 32px;
    margin-bottom: 10px;
    color: #333;
}

.error-container p {
    font-size: 18px;
    color: #555;
    margin-bottom: 30px;
}

.btn-primary {
    display: inline-block;
    background: #007bff;
    color: white;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 6px;
    font-size: 16px;
    transition: background 0.3s ease;
}

.btn-primary:hover {
    background: #0056b3;
}