* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    background-color: #f0f2f5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.sidebar {
    width: 250px;
    background: #2c3e50;
    color: white;
    height: 100vh;
    position: fixed;
    padding: 20px;
    transition: transform 0.3s ease;
}

.sidebar h2 {
    margin-bottom: 20px;
    font-size: 24px;
}

.sidebar a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 10px;
    margin: 5px 0;
    border-radius: 4px;
    transition: background 0.3s;
}

.sidebar a:hover {
    background: #34495e;
}

.main-content {
    margin-left: 270px;
    padding: 20px;
    flex: 1;
}

h1, h2 {
    color: #2c3e50;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #2c3e50;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.btn {
    background: #3498db;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

.btn:hover {
    background: #2980b9;
}

.btn-danger {
    background: #e74c3c;
}

.btn-danger:hover {
    background: #c0392b;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background: #3498db;
    color: white;
}

tr:hover {
    background: #f5f5f5;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
}

footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: auto;
}

.error {
    color: #e74c3c;
    margin-bottom: 10px;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-250px);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
}