:root {
    --primary-color: #0066cc;
    --primary-hover: #0052a3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --border-color: #dee2e6;
    --sidebar-width: 250px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--light-bg);
    color: var(--dark-text);
    line-height: 1.6;
}

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #1e3a5f 0%, #2c5282 100%);
    color: white;
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar-header {
    padding: 30px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h1 {
    font-size: 24px;
    font-weight: 600;
}

.user-info {
    margin-top: 20px;
    padding: 15px;
    background-color: rgba(255,255,255,0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 18px;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-weight: 600;
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-email {
    font-size: 12px;
    color: rgba(255,255,255,0.7);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-menu {
    list-style: none;
    padding: 20px 0;
    flex: 1;
}

.nav-menu li {
    margin: 5px 0;
}

.nav-link {
    display: block;
    padding: 12px 20px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background-color: rgba(255,255,255,0.1);
    color: white;
}

.nav-link.active {
    background-color: rgba(255,255,255,0.15);
    border-left-color: white;
    color: white;
    font-weight: 500;
}

.monitoring-status {
    padding: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 14px;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 5px;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--secondary-color);
    animation: pulse 2s infinite;
}

.status-dot.active {
    background-color: var(--success-color);
}

.status-dot.error {
    background-color: var(--danger-color);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.last-check {
    color: rgba(255,255,255,0.6);
    font-size: 12px;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.page {
    display: none;
}

.page.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-header h2 {
    font-size: 28px;
    font-weight: 600;
    color: var(--dark-text);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-left: 4px solid var(--primary-color);
}

.stat-card.alert {
    border-left-color: var(--danger-color);
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-card.alert .stat-value {
    color: var(--danger-color);
}

.stat-label {
    font-size: 14px;
    color: var(--secondary-color);
    text-transform: uppercase;
    font-weight: 500;
}

/* PPSK Cards */
.ppsk-list h3 {
    margin-bottom: 20px;
    font-size: 22px;
}

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

.ppsk-card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.ppsk-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.ppsk-card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 15px;
}

.ppsk-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--dark-text);
}

.ppsk-status {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.ppsk-status.ok {
    background-color: #d4edda;
    color: #155724;
}

.ppsk-status.exceeded {
    background-color: #f8d7da;
    color: #721c24;
}

.ppsk-info {
    font-size: 14px;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.device-count {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.device-progress {
    flex: 1;
    height: 8px;
    background-color: #e9ecef;
    border-radius: 10px;
    overflow: hidden;
}

.device-progress-bar {
    height: 100%;
    background-color: var(--success-color);
    transition: width 0.3s ease;
}

.device-progress-bar.warning {
    background-color: var(--warning-color);
}

.device-progress-bar.danger {
    background-color: var(--danger-color);
}

/* Table */
.table-container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
}

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

.data-table thead {
    background-color: var(--light-bg);
}

.data-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--dark-text);
    border-bottom: 2px solid var(--border-color);
}

.data-table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr:hover {
    background-color: rgba(0,102,204,0.05);
}

.text-center {
    text-align: center;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,102,204,0.3);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Forms */
.settings-container {
    max-width: 900px;
}

.settings-section {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.settings-section h3 {
    margin-bottom: 20px;
    font-size: 20px;
    color: var(--dark-text);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-text);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group input[type="checkbox"] {
    margin-right: 8px;
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: var(--secondary-color);
    font-size: 12px;
}

.info-box {
    background-color: #e7f3ff;
    border-left: 4px solid var(--info-color);
    padding: 15px;
    border-radius: 4px;
    margin-top: 15px;
    font-size: 14px;
}

.info-box strong {
    display: block;
    margin-bottom: 5px;
    color: var(--dark-text);
}

.form-actions {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    padding: 0;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    animation: slideUp 0.3s ease;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    font-size: 20px;
}

.close {
    font-size: 28px;
    font-weight: bold;
    color: var(--secondary-color);
    cursor: pointer;
    transition: color 0.3s;
}

.close:hover {
    color: var(--dark-text);
}

.modal-content form {
    padding: 30px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--dark-text);
    color: white;
    padding: 15px 25px;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 2000;
    max-width: 400px;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background-color: var(--success-color);
}

.toast.error {
    background-color: var(--danger-color);
}

.toast.warning {
    background-color: var(--warning-color);
    color: var(--dark-text);
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        position: relative;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    #ppskCards {
        grid-template-columns: 1fr;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* VLAN Badge */
.vlan-badge {
    display: inline-block;
    padding: 4px 8px;
    background-color: var(--secondary-color);
    border-radius: 4px;
    font-size: 0.9em;
    color: white;
}