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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

header {
    background: #2c3e50;
    color: white;
    padding: 1.5rem;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    font-weight: normal;
}

nav ul {
    list-style: none;
    background: #34495e;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
}

nav li {
    flex: 1;
}

nav a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 1rem;
    text-align: center;
    border-right: 1px solid #2c3e50;
}

nav a:hover {
    background: #2c3e50;
}

.user-greeting {
    color: #ecf0f1;
    padding: 1rem;
    text-align: center;
}

.logout-btn {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 0.7rem 1.2rem;
    cursor: pointer;
}

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

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border: 1px solid #ddd;
}

h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #3498db;
    font-size: 1.8rem;
    font-weight: normal;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    border: 1px solid #ddd;
}

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

th {
    background: #3498db;
    color: white;
    font-weight: bold;
}

tr:nth-child(even) {
    background: #f9f9f9;
}

tr:hover {
    background: #e8f4f8;
}

form {
    margin: 1.5rem 0;
    padding: 1.5rem;
    background: #f9f9f9;
    border: 1px solid #ddd;
}

input[type="text"], input[type="time"], input[type="datetime-local"] {
    padding: 0.7rem;
    border: 1px solid #ccc;
    margin: 0.3rem;
    font-size: 1rem;
}

input[type="text"]:focus, input[type="time"]:focus, input[type="datetime-local"]:focus {
    border-color: #3498db;
    outline: none;
}

input[type="submit"], button {
    background: #3498db;
    color: white;
    padding: 0.7rem 1.5rem;
    border: none;
    cursor: pointer;
    margin: 0.3rem;
    font-size: 1rem;
}

input[type="submit"]:hover, button:hover {
    background: #2980b9;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.success {
    color: #27ae60;
    background: #d5f4e6;
    padding: 1rem;
    margin: 1.5rem 0;
    border: 1px solid #27ae60;
}
.normal {
    color: #000000;
    background: #d5f4e6;
    padding: 1rem;
    margin: 1.5rem 0;
    border: 1px solid #9c9c9c;
}

.error {
    color: #e74c3c;
    background: #fdf2f2;
    padding: 1rem;
    margin: 1.5rem 0;
    border: 1px solid #e74c3c;
}

.login-container {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border: 1px solid #ddd;
    border-radius: 5px;
}

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

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

.form-group input {
    width: 100%;
    padding: 0.7rem;
    border: 1px solid #ccc;
    border-radius: 3px;
    font-size: 1rem;
}

.demo-accounts {
    margin-top: 2rem;
    padding: 1rem;
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 3px;
}

.demo-accounts h3 {
    margin-bottom: 0.5rem;
    color: #495057;
}

.demo-accounts p {
    margin: 0.3rem 0;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
    }
    
    nav a {
        border-right: none;
        border-bottom: 1px solid #2c3e50;
    }
    
    main {
        margin: 1rem;
        padding: 1rem;
    }
    
    table {
        font-size: 0.9rem;
    }
    
    th, td {
        padding: 0.7rem 0.5rem;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
}