:root {
    --bg-color: #f4f4f4;
    --text-color: #333;
    --primary-color: #4285f4;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
}

@media (max-width: 768px) {
    .container {
        width: 95%;
        padding: 10px;
    }
    nav {
        flex-direction: column;
    }
}

body.dark {
    --bg-color: #222;
    --text-color: #f4f4f4;
    --primary-color: #8ab4f8;
}

@media (max-width: 768px) {
    .login-container {
        margin: 50px auto;
        padding: 1rem;
    }
    #main-nav {
        flex-direction: column;
        gap: 0.5rem;
    }
    table {
        font-size: 0.9rem;
    }
}
.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.login-container h1 {
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
}

.form-group input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

header {
    background-color: #333;
    color: white;
    padding: 1rem;
    text-align: center;
}
#main-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 1rem;
}
#main-nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}
#main-nav a:hover {
    background-color: #555;
}
#content {
    padding: 2rem;
}
.module-content {
    margin-top: 1rem;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}
table th, table td {
    border: 1px solid #ddd;
    padding: 0.75rem;
    text-align: left;
}
table th {
    background-color: #f4f4f4;
}
button {
    padding: 0.5rem 1rem;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}
button:hover {
    background-color: #0056b3;
}
.delete-btn {
    background-color: #dc3545;
}
.delete-btn:hover {
    background-color: #a71d2a;
}
.edit-btn {
    background-color: #28a745;
}
.edit-btn:hover {
    background-color: #1e7e34;
}
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0,0,0,0.1);
    border-radius: 50%;
    border-top-color: #007BFF;
    animation: spin 1s ease-in-out infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}