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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 30px;
}

header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e0e0e0;
}

header h1 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 2.5em;
}

.stats {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.stat-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 25px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.stat-label {
    font-weight: 500;
}

.stat-value {
    font-size: 1.5em;
    font-weight: bold;
}

.message {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
}

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

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

section {
    margin-bottom: 40px;
}

section h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.8em;
}

.add-subnet {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: #666;
    font-size: 0.9em;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.btn-delete {
    background: #dc3545;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.3s;
}

.btn-delete:hover {
    background: #c82333;
    transform: scale(1.1);
}

.subnets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.subnet-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 20px;
    transition: all 0.3s;
}

.subnet-card:hover {
    border-color: #667eea;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.2);
    transform: translateY(-2px);
}

.subnet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e0e0e0;
}

.subnet-header h3 {
    color: #667eea;
    font-size: 1.3em;
}

.subnet-info {
    margin-bottom: 15px;
}

.subnet-info p {
    margin-bottom: 8px;
    color: #666;
}

.subnet-info strong {
    color: #333;
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: #999;
    font-style: italic;
}

.all-ips-link {
    text-align: center;
    margin-top: 30px;
}

.filter-section {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.subnet-info-box {
    background: #e7f3ff;
    border-left: 4px solid #667eea;
    padding: 15px 20px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.subnet-info-box h3 {
    color: #667eea;
    margin-bottom: 10px;
}

.subnet-info-box p {
    margin-bottom: 5px;
    color: #555;
}

.ips-list {
    margin-top: 30px;
}

.count-info {
    margin-bottom: 20px;
    font-size: 1.1em;
    color: #666;
}

.ips-table-container {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.ips-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.ips-table thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.ips-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.ips-table td {
    padding: 12px 15px;
    border-bottom: 1px solid #e0e0e0;
}

.ips-table tbody tr:hover {
    background: #f8f9fa;
}

.ips-table tbody tr:last-child td {
    border-bottom: none;
}

.ips-table code {
    background: #f1f1f1;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: #667eea;
    font-weight: 600;
}

.inline-form {
    display: inline;
    margin: 0;
}

.inline-input {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.9em;
    min-width: 150px;
}

.inline-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.inline-select {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.9em;
    min-width: 150px;
    background: white;
}

.inline-select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.btn-edit {
    background: #667eea;
    color: white;
    border: none;
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s;
}

.btn-edit:hover {
    background: #5568d3;
    transform: scale(1.1);
}

.customers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.customer-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 20px;
    transition: all 0.3s;
}

.customer-card:hover {
    border-color: #667eea;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.2);
    transform: translateY(-2px);
}

.customer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e0e0e0;
}

.customer-header h3 {
    color: #667eea;
    font-size: 1.2em;
}

.customer-info {
    margin-bottom: 10px;
}

.customer-info p {
    margin-bottom: 5px;
    color: #666;
}

.customer-info strong {
    color: #333;
}

/* Popup Styles */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.popup-content {
    background: white;
    border-radius: 12px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e0e0e0;
}

.popup-header h2 {
    color: #667eea;
    margin: 0;
}

.popup-close {
    background: none;
    border: none;
    font-size: 2em;
    color: #999;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s;
}

.popup-close:hover {
    background: #f0f0f0;
    color: #333;
}

.search-section {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.search-section h2 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.5em;
}

.search-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 1.8em;
    }
    
    .subnets-grid {
        grid-template-columns: 1fr;
    }
    
    .customers-grid {
        grid-template-columns: 1fr;
    }
    
    .stats {
        flex-direction: column;
    }
    
    .ips-table {
        font-size: 0.9em;
    }
    
    .inline-input, .inline-select {
        min-width: 120px;
    }
    
    .popup-content {
        padding: 20px;
        width: 95%;
    }
    
    .search-section form {
        flex-direction: column;
    }
    
    .search-section form .btn {
        width: 100%;
    }
}