/* ─────────────── RESET & BASE ─────────────── */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --bg-primary: #0b0e14;
            --bg-secondary: #131a24;
            --bg-card: #1a232f;
            --bg-card-hover: #212d3d;
            --bg-input: #0f1620;
            --border-color: #2a3a4a;
            --text-primary: #e8edf5;
            --text-secondary: #8a9bb5;
            --text-muted: #5a6f8a;
            --accent-blue: #3b82f6;
            --accent-green: #22c55e;
            --accent-red: #ef4444;
            --accent-yellow: #eab308;
            --accent-purple: #8b5cf6;
            --accent-cyan: #06b6d4;
            --shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
            --radius: 12px;
            --radius-sm: 6px;
            --transition: 0.25s ease;
        }

        html {
            font-size: 14px;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            padding: 0;
            margin: 0;
        }

        /* ─── SCROLLBAR ─── */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-secondary);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 8px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ─── LOGIN OVERLAY ─── */
        .login-overlay {
            position: fixed;
            inset: 0;
            background: rgba(11, 14, 20, 0.92);
            backdrop-filter: blur(12px);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            padding: 20px;
            transition: opacity 0.4s ease, visibility 0.4s ease;
        }
        .login-overlay.hidden {
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
        }

        .login-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 40px 36px 36px;
            max-width: 400px;
            width: 100%;
            box-shadow: var(--shadow);
            animation: modalIn 0.3s ease;
        }

        .login-card .logo {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .login-card .logo i {
            color: var(--accent-cyan);
        }
        .login-card .logo span {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .login-card .sub {
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
            margin-bottom: 28px;
        }

        .login-card .form-group {
            margin-bottom: 16px;
        }
        .login-card .form-group label {
            display: block;
            font-size: 0.78rem;
            font-weight: 500;
            color: var(--text-secondary);
            margin-bottom: 4px;
        }
        .login-card .form-group input {
            width: 100%;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            background: var(--bg-input);
            color: var(--text-primary);
            font-size: 0.9rem;
            outline: none;
            transition: var(--transition);
        }
        .login-card .form-group input:focus {
            border-color: var(--accent-blue);
        }
        .login-card .form-group input::placeholder {
            color: var(--text-muted);
        }

        .login-card .login-error {
            color: var(--accent-red);
            font-size: 0.8rem;
            margin-bottom: 12px;
            text-align: center;
            min-height: 20px;
        }

        .login-card .btn-login {
            width: 100%;
            padding: 12px;
            background: var(--accent-blue);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .login-card .btn-login:hover {
            background: #2563eb;
            transform: translateY(-1px);
        }
        .login-card .btn-login:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .login-card .footer-msg {
            text-align: center;
            margin-top: 20px;
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        /* ─── MAIN APP (hidden by default) ─── */
        .app-wrapper {
            display: none;
            flex-direction: column;
            min-height: 100vh;
        }
        .app-wrapper.visible {
            display: flex;
        }

        /* ─── HEADER ─── */
        .header {
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(12px);
        }

        .header-left {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.2rem;
            letter-spacing: -0.5px;
        }
        .header-logo i {
            color: var(--accent-cyan);
            font-size: 1.4rem;
        }
        .header-logo span {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .header-badge {
            font-size: 0.65rem;
            background: var(--accent-blue);
            color: #fff;
            padding: 2px 10px;
            border-radius: 20px;
            font-weight: 600;
            letter-spacing: 0.3px;
            -webkit-text-fill-color: #fff;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .header-user {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }
        .header-user i {
            color: var(--accent-cyan);
        }
        .header-user .username {
            color: var(--text-primary);
            font-weight: 500;
        }

        .header-stats {
            display: flex;
            gap: 16px;
            font-size: 0.75rem;
        }
        .header-stats .stat-item {
            display: flex;
            align-items: center;
            gap: 6px;
            color: var(--text-secondary);
        }
        .header-stats .stat-item .num {
            color: var(--text-primary);
            font-weight: 600;
        }
        .header-stats .stat-item .num.online {
            color: var(--accent-green);
        }
        .header-stats .stat-item .num.offline {
            color: var(--accent-red);
        }

        .header-actions {
            display: flex;
            gap: 6px;
            align-items: center;
        }

        /* ─── BUTTONS ─── */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            border: none;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.85rem;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            background: var(--bg-card);
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }
        .btn:hover {
            background: var(--bg-card-hover);
            transform: translateY(-1px);
        }
        .btn-primary {
            background: var(--accent-blue);
            color: #fff;
            border-color: var(--accent-blue);
        }
        .btn-primary:hover {
            background: #2563eb;
            border-color: #2563eb;
        }
        .btn-success {
            background: var(--accent-green);
            color: #fff;
            border-color: var(--accent-green);
        }
        .btn-success:hover {
            background: #16a34a;
            border-color: #16a34a;
        }
        .btn-danger {
            background: var(--accent-red);
            color: #fff;
            border-color: var(--accent-red);
        }
        .btn-danger:hover {
            background: #dc2626;
            border-color: #dc2626;
        }
        .btn-outline {
            background: transparent;
            border: 1px solid var(--border-color);
        }
        .btn-outline:hover {
            background: var(--bg-card);
        }
        .btn-sm {
            padding: 4px 12px;
            font-size: 0.75rem;
        }
        .btn-icon {
            padding: 8px 10px;
            font-size: 0.9rem;
        }
        .btn-logout {
            background: transparent;
            border: 1px solid var(--accent-red);
            color: var(--accent-red);
        }
        .btn-logout:hover {
            background: var(--accent-red);
            color: #fff;
        }

        /* ─── MAIN LAYOUT ─── */
        .main {
            flex: 1;
            padding: 24px 32px 40px;
            max-width: 1600px;
            margin: 0 auto;
            width: 100%;
        }

        /* ─── FILTER BAR ─── */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
            margin-bottom: 24px;
            background: var(--bg-secondary);
            padding: 12px 20px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
        }

        .filter-bar .search-wrap {
            flex: 1;
            min-width: 180px;
            position: relative;
        }
        .filter-bar .search-wrap i {
            position: absolute;
            left: 12px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
        }
        .filter-bar .search-wrap input {
            width: 100%;
            padding: 8px 12px 8px 36px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            background: var(--bg-input);
            color: var(--text-primary);
            font-size: 0.85rem;
            outline: none;
            transition: var(--transition);
        }
        .filter-bar .search-wrap input:focus {
            border-color: var(--accent-blue);
        }
        .filter-bar .search-wrap input::placeholder {
            color: var(--text-muted);
        }

        .filter-bar .filter-group {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }
        .filter-bar .filter-group .filter-btn {
            padding: 6px 16px;
            border-radius: 20px;
            border: 1px solid var(--border-color);
            background: transparent;
            color: var(--text-secondary);
            font-size: 0.78rem;
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
        }
        .filter-bar .filter-group .filter-btn:hover {
            background: var(--bg-card);
            color: var(--text-primary);
        }
        .filter-bar .filter-group .filter-btn.active {
            background: var(--accent-blue);
            color: #fff;
            border-color: var(--accent-blue);
        }

        /* ─── STATS ROW ─── */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 14px;
            margin-bottom: 24px;
        }

        .stat-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 16px 20px;
            display: flex;
            align-items: center;
            gap: 14px;
            transition: var(--transition);
        }
        .stat-card:hover {
            border-color: var(--text-muted);
        }
        .stat-card .icon {
            width: 42px;
            height: 42px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        .stat-card .icon.blue {
            background: rgba(59, 130, 246, 0.18);
            color: var(--accent-blue);
        }
        .stat-card .icon.green {
            background: rgba(34, 197, 94, 0.18);
            color: var(--accent-green);
        }
        .stat-card .icon.red {
            background: rgba(239, 68, 68, 0.18);
            color: var(--accent-red);
        }
        .stat-card .icon.purple {
            background: rgba(139, 92, 246, 0.18);
            color: var(--accent-purple);
        }
        .stat-card .icon.cyan {
            background: rgba(6, 182, 212, 0.18);
            color: var(--accent-cyan);
        }
        .stat-card .info .label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--text-muted);
        }
        .stat-card .info .value {
            font-size: 1.4rem;
            font-weight: 700;
            line-height: 1.2;
        }
        .stat-card .info .value.green {
            color: var(--accent-green);
        }
        .stat-card .info .value.red {
            color: var(--accent-red);
        }
        .stat-card .info .value.blue {
            color: var(--accent-blue);
        }
        .stat-card .info .value.cyan {
            color: var(--accent-cyan);
        }

        /* ─── TABLE ─── */
        .table-wrap {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            overflow: hidden;
            overflow-x: auto;
        }

        .table-wrap table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.85rem;
            min-width: 900px;
        }

        .table-wrap thead {
            background: var(--bg-card);
            border-bottom: 1px solid var(--border-color);
        }
        .table-wrap thead th {
            text-align: left;
            padding: 14px 16px;
            font-weight: 600;
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--text-muted);
            white-space: nowrap;
        }
        .table-wrap tbody tr {
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .table-wrap tbody tr:last-child {
            border-bottom: none;
        }
        .table-wrap tbody tr:hover {
            background: var(--bg-card-hover);
        }
        .table-wrap tbody td {
            padding: 12px 16px;
            vertical-align: middle;
        }

        .device-type {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.7rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }
        .device-type.olt {
            background: rgba(139, 92, 246, 0.2);
            color: var(--accent-purple);
        }
        .device-type.switch {
            background: rgba(59, 130, 246, 0.2);
            color: var(--accent-blue);
        }
        .device-type.mikrotik {
            background: rgba(6, 182, 212, 0.2);
            color: var(--accent-cyan);
        }
        .device-type.other {
            background: rgba(234, 179, 8, 0.2);
            color: var(--accent-yellow);
        }

        .status-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.75rem;
            font-weight: 500;
        }
        .status-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            display: inline-block;
        }
        .status-badge .dot.online {
            background: var(--accent-green);
            box-shadow: 0 0 8px rgba(34, 197, 94, 0.4);
        }
        .status-badge .dot.offline {
            background: var(--accent-red);
            box-shadow: 0 0 8px rgba(239, 68, 68, 0.4);
        }
        .status-badge .dot.checking {
            background: var(--accent-yellow);
            animation: pulse 0.8s infinite alternate;
        }

        @keyframes pulse {
            0% {
                opacity: 0.4;
                transform: scale(0.9);
            }
            100% {
                opacity: 1;
                transform: scale(1.2);
            }
        }

        .ip-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--text-secondary);
            text-decoration: none;
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 0.8rem;
            transition: var(--transition);
        }
        .ip-link:hover {
            color: var(--accent-cyan);
        }
        .ip-link i {
            font-size: 0.65rem;
            opacity: 0.6;
        }

        .creds {
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 0.75rem;
            color: var(--text-muted);
        }
        .creds .label {
            color: var(--text-secondary);
            font-size: 0.6rem;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }

        .action-btns {
            display: flex;
            gap: 4px;
            flex-wrap: wrap;
        }
        .action-btns .btn {
            padding: 4px 10px;
            font-size: 0.7rem;
        }

        .empty-state {
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
        }
        .empty-state i {
            font-size: 3rem;
            margin-bottom: 16px;
            opacity: 0.3;
        }
        .empty-state h3 {
            color: var(--text-secondary);
            font-weight: 400;
            margin-bottom: 6px;
        }
        .empty-state p {
            font-size: 0.85rem;
        }

        /* ─── MODAL (generic) ─── */
        .modal-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(6px);
            z-index: 999;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        .modal-overlay.open {
            display: flex;
        }

        .modal {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            max-width: 600px;
            width: 100%;
            max-height: 90vh;
            overflow-y: auto;
            padding: 28px 32px 32px;
            box-shadow: var(--shadow);
            animation: modalIn 0.2s ease;
        }
        .modal-sm {
            max-width: 440px;
        }

        @keyframes modalIn {
            from {
                opacity: 0;
                transform: scale(0.96) translateY(12px);
            }
            to {
                opacity: 1;
                transform: scale(1) translateY(0);
            }
        }

        .modal-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 24px;
        }
        .modal-header h2 {
            font-size: 1.2rem;
            font-weight: 600;
        }
        .modal-header .close-btn {
            background: none;
            border: none;
            color: var(--text-muted);
            font-size: 1.4rem;
            cursor: pointer;
            transition: var(--transition);
            padding: 4px 8px;
            border-radius: 6px;
        }
        .modal-header .close-btn:hover {
            background: var(--bg-card);
            color: var(--text-primary);
        }

        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-size: 0.78rem;
            font-weight: 500;
            color: var(--text-secondary);
            margin-bottom: 4px;
        }
        .form-group label .required {
            color: var(--accent-red);
            margin-left: 2px;
        }
        .form-group input,
        .form-group select {
            width: 100%;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            background: var(--bg-input);
            color: var(--text-primary);
            font-size: 0.9rem;
            outline: none;
            transition: var(--transition);
            font-family: inherit;
        }
        .form-group input:focus,
        .form-group select:focus {
            border-color: var(--accent-blue);
        }
        .form-group input::placeholder {
            color: var(--text-muted);
        }
        .form-group select option {
            background: var(--bg-secondary);
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
        }
        .form-row .form-group {
            margin-bottom: 0;
        }

        .form-actions {
            display: flex;
            gap: 10px;
            justify-content: flex-end;
            margin-top: 24px;
            padding-top: 16px;
            border-top: 1px solid var(--border-color);
        }

        /* ─── TOAST ─── */
        .toast-container {
            position: fixed;
            bottom: 24px;
            right: 24px;
            z-index: 9999;
            display: flex;
            flex-direction: column;
            gap: 10px;
            max-width: 360px;
        }
        .toast {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 14px 20px;
            box-shadow: var(--shadow);
            display: flex;
            align-items: center;
            gap: 12px;
            animation: slideIn 0.25s ease;
            font-size: 0.85rem;
        }
        .toast i {
            font-size: 1.1rem;
        }
        .toast.success i {
            color: var(--accent-green);
        }
        .toast.error i {
            color: var(--accent-red);
        }
        .toast.info i {
            color: var(--accent-blue);
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(24px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        /* ─── RESPONSIVE ─── */
        @media (max-width: 768px) {
            .header {
                padding: 12px 16px;
            }
            .header-left .header-badge {
                display: none;
            }
            .header-stats {
                gap: 12px;
                font-size: 0.7rem;
            }
            .main {
                padding: 16px;
            }
            .filter-bar {
                flex-direction: column;
                align-items: stretch;
                padding: 12px 16px;
            }
            .filter-bar .filter-group {
                justify-content: center;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .form-row {
                grid-template-columns: 1fr;
            }
            .modal {
                padding: 20px 16px;
            }
            .header-right .header-actions .btn span {
                display: none;
            }
            .table-wrap table {
                font-size: 0.75rem;
                min-width: 700px;
            }
            .table-wrap thead th,
            .table-wrap tbody td {
                padding: 8px 10px;
            }
            .login-card {
                padding: 28px 20px;
            }
        }

        @media (max-width: 480px) {
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-card {
                padding: 12px 14px;
            }
            .stat-card .info .value {
                font-size: 1.1rem;
            }
            .header-stats .stat-item .label {
                display: none;
            }
        }