* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1, h2, h3 {
    margin-bottom: 20px;
    color: #2c3e50;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    margin: 5px;
    border: none;
    cursor: pointer;
}

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

.btn-danger {
    background: #e74c3c;
}

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

input[type="text"], input[type="email"], input[type="password"], input[type="number"] {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

table th, table td {
    padding: 10px;
    border: 1px solid #ddd;
    text-align: left;
}

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

.error {
    background: #e74c3c;
    color: white;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}

.success {
    background: #27ae60;
    color: white;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.stat-box {
    background: #ecf0f1;
    padding: 15px;
    border-radius: 5px;
    text-align: center;
}

.actions {
    margin: 20px 0;
    text-align: center;
}

@media (max-width: 600px) {
    .container {
        margin: 10px;
        padding: 15px;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
}