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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    margin: 0 2rem;
    font-size: 2rem;
    font-weight: 600;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    margin-top: 1rem;
    background-color: rgba(255, 255, 255, 0.1);
}

nav ul li {
    margin: 0;
}

nav ul li a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    transition: background-color 0.3s ease;
    border-bottom: 3px solid transparent;
}

nav ul li a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-bottom-color: #fff;
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem 5rem 2rem;
}

h2 {
    color: #667eea;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

h3 {
    color: #667eea;
    margin: 1.5rem 0 1rem 0;
    font-size: 1.3rem;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

form {
    display: flex;
    flex-direction: column;
}

label {
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: #555;
}

input, textarea, select {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    margin-bottom: 1rem;
    transition: border-color 0.3s ease;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 5px rgba(102, 126, 234, 0.3);
}

button {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-top: 0.5rem;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

table th {
    background-color: #667eea;
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

table td {
    padding: 1rem;
    border-bottom: 1px solid #eee;
}

table tr:hover {
    background-color: #f8f9fa;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    margin: 0 0.25rem;
}

.btn-delete {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.btn-edit {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 2rem;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.close {
    color: #aaa;
    float: right;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #000;
}

footer {
    background-color: #667eea;
    color: white;
    text-align: center;
    padding: 1.5rem;
    position: fixed;
    bottom: 0;
    width: 100%;
    box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.1);
}

.user-info {
    background-color: rgba(255, 255, 255, 0.15);
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    float: right;
    margin-top: 0.25rem;
}

.user-info span {
    color: white;
    font-weight: 600;
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
    }
    
    nav ul li {
        width: 100%;
    }
    
    nav ul li a {
        padding: 1rem;
    }
    
    main {
        padding: 1rem 1rem 5rem 1rem;
    }
    
    .card {
        padding: 1rem;
    }
}