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

body {
    background-color: #f5f5f5;
    color: #333;
}

.container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 220px;
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 20px 0;
}

.logo {
    text-align: center;
    padding: 10px 0 30px;
    border-bottom: 1px solid #34495e;
    margin-bottom: 20px;
}

.nav-menu {
    list-style: none;
}

.nav-menu li {
    padding: 12px 20px;
    cursor: pointer;
    transition: all 0.3s;
}

.nav-menu li:hover, .nav-menu li.active {
    background-color: #34495e;
}

.nav-menu li i {
    margin-right: 10px;
}

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

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid #ddd;
    margin-bottom: 20px;
}

.user-info {
    display: flex;
    align-items: center;
}

.search-box {
    display: flex;
    margin-bottom: 20px;
}

.search-input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
    outline: none;
}

.search-btn, .add-btn {
    padding: 10px 15px;
    color: white;
    border: none;
    cursor: pointer;
}

.search-btn {
    background-color: #3498db;
    border-radius: 0 4px 4px 0;
}

.add-btn {
    background-color: #2ecc71;
    border-radius: 4px;
    margin-left: 10px;
}

.card {
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.card-header {
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
}

.card-body {
    padding: 20px;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #f9f9f9;
    font-weight: 600;
}

tr:hover {
    background-color: #f5f5f5;
}

.btn {
    padding: 8px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

.btn-primary {
    background-color: #3498db;
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-danger {
    background-color: #e74c3c;
    color: white;
}

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

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 50%;
    border-radius: 5px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: black;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-control {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
    
    .modal-content {
        width: 90%;
    }
}