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

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

.header {
    background: linear-gradient(135deg, #2c3e50, #3498db);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header h1 {
    font-size: 1.5rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-logout {
    background-color: #e74c3c;
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s;
}

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

.nav {
    background-color: #34495e;
    padding: 0;
}

.nav ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}

.nav li {
    margin: 0;
}

.nav a {
    color: white;
    text-decoration: none;
    padding: 1rem 1.5rem;
    display: block;
    transition: background-color 0.3s;
}

.nav a:hover {
    background-color: #2c3e50;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: center;
}

.login-header {
    margin-bottom: 2rem;
}

.login-header h2 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.login-header h3 {
    color: #7f8c8d;
    font-size: 1rem;
    font-weight: normal;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #2c3e50;
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e9ecef;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: #3498db;
}

.btn {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.btn-primary {
    background: linear-gradient(135deg, #3498db, #2980b9);
}

.btn-secondary {
    background: linear-gradient(135deg, #95a5a6, #7f8c8d);
}

.btn-success {
    background: linear-gradient(135deg, #27ae60, #219653);
}

.btn-danger {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
}

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.875rem;
}

.dashboard {
    padding: 0;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card h3 {
    font-size: 2.5rem;
    color: #3498db;
    margin-bottom: 0.5rem;
}

.stat-card p {
    color: #7f8c8d;
    margin-bottom: 1rem;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e9ecef;
}

.content-header h2 {
    color: #2c3e50;
    margin: 0;
}

.form-container {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.table-container {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    overflow-x: auto;
}

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

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
}

th {
    background-color: #34495e;
    color: white;
    font-weight: 600;
}

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

.actions {
    display: flex;
    gap: 0.5rem;
}

.btn-edit {
    background-color: #f39c12;
    color: white;
    padding: 0.4rem 0.8rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
}

.btn-delete {
    background-color: #e74c3c;
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    text-decoration: none;
    font-size: 0.875rem;
    display: inline-block;
}

.btn-delete-small {
    background-color: #e74c3c;
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    text-decoration: none;
    font-size: 0.75rem;
    display: inline-block;
    margin-left: 0.5rem;
}

.error {
    background-color: #e74c3c;
    color: white;
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.success {
    background-color: #27ae60;
    color: white;
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.footer {
    text-align: center;
    padding: 2rem;
    color: #7f8c8d;
    border-top: 1px solid #e9ecef;
    margin-top: 2rem;
}

.import-export-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.export-section, .import-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.info-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.info-section ul {
    padding-left: 1.5rem;
}

.info-section li {
    margin-bottom: 0.5rem;
}

/* DataTables Customization */
.dataTables_wrapper {
    margin-top: 1rem;
}

.dataTables_filter input {
    padding: 0.5rem;
    border: 2px solid #e9ecef;
    border-radius: 4px;
}

.dataTables_length select {
    padding: 0.5rem;
    border: 2px solid #e9ecef;
    border-radius: 4px;
}

.dataTables_paginate .paginate_button {
    padding: 0.5rem 1rem;
    margin: 0 0.25rem;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    text-decoration: none;
    color: #3498db;
}

.dataTables_paginate .paginate_button.current {
    background: #3498db;
    color: white;
    border-color: #3498db;
}

/* Responsive */
@media (max-width: 768px) {
    .nav ul {
        flex-direction: column;
    }
    
    .form-row {
        flex-direction: column;
        gap: 0;
    }
    
    .content-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .import-export-container {
        grid-template-columns: 1fr;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .actions {
        flex-direction: column;
    }
}