:root {
            --font-family: 'Segoe UI Variable', 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
            --bg-body: #ffffff; /* Clean White instead of gray */
            --bg-card: rgba(255, 255, 255, 0.7); /* Acrylic effect */
            --bg-sidebar: rgba(243, 243, 243, 0.85);
            --border-color: rgba(0, 0, 0, 0.05); /* Very subtle borders */
            --text-main: #202020;
            --text-muted: #5c5c5c;
            --primary: #0067c0; /* Windows accent color */
            --primary-hover: #005a9e;
            --primary-light: rgba(0, 103, 192, 0.1);
            --success: #0f7b0f;
            --success-light: rgba(15, 123, 15, 0.1);
            --warning: #9d5d00;
            --warning-light: rgba(157, 93, 0, 0.1);
            --danger: #c42b1c;
            --danger-light: rgba(196, 43, 28, 0.1);
            --cyan: #0078d4;
            --radius-lg: 12px;
            --radius-md: 8px;
            --radius-sm: 4px;
            --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1); /* Snappy Fluent motion */
            --shadow-elevation-1: 0 2px 4px rgba(0,0,0,0.04), 0 0 2px rgba(0,0,0,0.06);
            --shadow-elevation-4: 0 16px 32px rgba(0,0,0,0.1), 0 0 2px rgba(0,0,0,0.08);
        }

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

        body {
            font-family: var(--font-family);
            background-color: var(--bg-body);
            background-image: radial-gradient(circle at 15% 50%, rgba(0, 120, 212, 0.05), transparent 25%),
                              radial-gradient(circle at 85% 30%, rgba(0, 103, 192, 0.04), transparent 25%);
            background-attachment: fixed;
            color: var(--text-main);
            min-height: 100vh;
            overflow-x: hidden;
            display: flex;
            flex-direction: column;
        }

        /* WINDOWS 11 MICA / ACRYLIC EFFECT */
        .glass-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-top: 1px solid rgba(255, 255, 255, 0.6); /* Highlight border on top */
            border-radius: var(--radius-lg);
            backdrop-filter: blur(40px) saturate(150%);
            -webkit-backdrop-filter: blur(40px) saturate(150%);
            padding: 24px;
            box-shadow: var(--shadow-elevation-1);
            transition: var(--transition);
        }

        .glass-card:hover {
            box-shadow: var(--shadow-elevation-4);
            border-color: rgba(0, 0, 0, 0.1);
        }

        /* NAVIGATION BAR */
        header {
            background-color: var(--bg-sidebar);
            border-bottom: 1px solid var(--border-color);
            padding: 16px 40px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 3px rgba(0,0,0,0.02);
        }

        .logo-section {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 20px;
            color: var(--text-main);
            cursor: pointer;
        }

        .logo-icon {
            background: linear-gradient(135deg, var(--primary), var(--cyan));
            width: 36px;
            height: 36px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 10px rgba(79, 70, 229, 0.2);
        }

        nav {
            display: flex;
            gap: 20px;
        }

        .nav-btn {
            background: none;
            border: none;
            color: var(--text-muted);
            font-size: 14.5px;
            font-weight: 600;
            cursor: pointer;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

        .nav-btn:hover, .nav-btn.active {
            color: var(--text-main);
            background-color: #f1f5f9;
        }

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

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

        /* LAYOUT MAIN CONTAINER */
        main {
            flex: 1;
            padding: 40px;
            max-width: 1400px;
            width: 100%;
            margin: 0 auto;
        }

        .hidden {
            display: none !important;
        }

        /* FORM ELEMENTS */
        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            font-size: 13px;
            font-weight: 700;
            color: var(--text-muted);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        input, select, textarea {
            width: 100%;
            background-color: #f8fafc;
            border: 1px solid var(--border-color);
            color: var(--text-main);
            padding: 12px 16px;
            border-radius: var(--radius-md);
            font-family: var(--font-family);
            font-size: 14.5px;
            transition: var(--transition);
        }

        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 10px rgba(79, 70, 229, 0.1);
            background-color: #ffffff;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            font-size: 14.5px;
            font-weight: 600;
            border-radius: var(--radius-md);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
        }

        .btn-primary {
            background-color: var(--primary);
            color: white;
            box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-1px);
        }

        .btn-secondary {
            background-color: #f1f5f9;
            color: var(--text-main);
            border: 1px solid var(--border-color);
        }

        .btn-secondary:hover {
            background-color: #e2e8f0;
        }

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

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

        /* GRID SYSTEM */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        /* STATS CARDS */
        .kpi-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            display: flex;
            align-items: center;
            gap: 20px;
            box-shadow: 0 2px 4px rgba(148, 163, 184, 0.05);
        }

        .kpi-icon {
            font-size: 32px;
            width: 54px;
            height: 54px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .kpi-info h3 {
            font-size: 28px;
            font-weight: 800;
            margin-bottom: 2px;
        }

        .kpi-info p {
            font-size: 13px;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* BADGES */
        .badge {
            display: inline-block;
            padding: 4px 10px;
            font-size: 11px;
            font-weight: 700;
            border-radius: 50px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .badge-info { background-color: #e0e7ff; color: #4f46e5; }
        .badge-success { background-color: #dcfce7; color: #16a34a; }
        .badge-warning { background-color: #fef3c7; color: #d97706; }
        .badge-danger { background-color: #fee2e2; color: #dc2626; }
        .badge-cyan { background-color: #ecfeff; color: #0891b2; }

        /* DEFECTS GRID (CHECKBOXES) */
        .defects-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 12px;
            margin-top: 10px;
        }

        .defect-item {
            display: flex;
            align-items: center;
            gap: 10px;
            background: #f8fafc;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            cursor: pointer;
            user-select: none;
            transition: var(--transition);
        }

        .defect-item input {
            width: auto;
            cursor: pointer;
        }

        .defect-item:hover {
            background: #ffffff;
            border-color: var(--primary);
            box-shadow: 0 4px 6px -1px rgba(148, 163, 184, 0.08);
        }

        /* TABLES */
        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            margin-top: 20px;
        }

        th {
            padding: 14px 16px;
            border-bottom: 2px solid var(--border-color);
            font-weight: 700;
            font-size: 13px;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        td {
            padding: 16px;
            border-bottom: 1px solid var(--border-color);
            font-size: 14.5px;
            vertical-align: middle;
        }

        tr:hover td {
            background-color: #f1f5f9;
        }

        /* CLIENT PORTAL LOOKUP AREA */
        .lookup-box {
            text-align: center;
            max-width: 600px;
            margin: 40px auto;
        }

        /* TIME LINE DIAGNOSTIC LOG */
        .timeline {
            margin-top: 20px;
            border-left: 2px solid var(--border-color);
            padding-left: 20px;
            position: relative;
        }

        .timeline-item {
            margin-bottom: 20px;
            position: relative;
        }

        .timeline-item::before {
            content: "";
            position: absolute;
            left: -27px;
            top: 4px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: var(--primary);
            border: 2px solid var(--bg-body);
        }

        .timeline-date {
            font-size: 12px;
            color: var(--text-muted);
            font-weight: 600;
        }

        .timeline-title {
            font-weight: 700;
            margin: 4px 0;
            font-size: 14.5px;
        }

        .timeline-desc {
            font-size: 13.5px;
            color: var(--text-muted);
        }

        /* PRINT STYLING */
        @media print {
            header, nav, .btn, .no-print {
                display: none !important;
            }
            body {
                background: white;
                color: black;
                padding: 0;
            }
            .glass-card {
                border: none;
                box-shadow: none;
                padding: 0;
            }
        }

        .admin-tabs button.active {
            background: linear-gradient(135deg, var(--cyan), var(--primary)) !important;
            color: white !important;
            border-color: transparent !important;
            box-shadow: 0 4px 10px rgba(8, 145, 178, 0.15);
        }

        /* MOBILE MODE OVERRIDES */
        body.mobile-mode-active {
            font-size: 14px;
        }
        body.mobile-mode-active header {
            padding: 12px 16px;
            justify-content: center;
        }
        body.mobile-mode-active header nav button:not(#btn-nav-logout) {
            display: none !important;
        }
        body.mobile-mode-active #sec-home .grid-2 {
            display: block !important;
        }
        body.mobile-mode-active #sec-home .grid-2 > div:first-child {
            display: none !important; /* Hide left column on homepage (tracking and contacts) */
        }
        body.mobile-mode-active #sec-home .glass-card {
            border: 1px solid var(--border-color);
            margin: 0 auto;
            max-width: 100%;
        }
        body.mobile-mode-active #sec-home p a {
            display: none !important; /* Hide registration prompt and other links */
        }
        body.mobile-mode-active #sec-home h1,
        body.mobile-mode-active #sec-home p {
            display: none !important; /* Hide home banners */
        }
        body.mobile-mode-active #sec-dashboard-cliente .btn-primary {
            display: none !important; /* Hide "Nuovo ticket" button */
        }
        body.mobile-mode-active #sec-dettagli-pratica .grid-2 {
            display: block !important;
        }
        body.mobile-mode-active #sec-dettagli-pratica .grid-2 > div:first-child table tr:not(#det-row-ransomware-info):not(#det-row-phone-creds):not(#det-row-cliente-partner):not(:first-child) {
            display: none !important; /* Hide technical table details except support type */
        }
        body.mobile-mode-active #sec-dettagli-pratica #det-device-image,
        body.mobile-mode-active #sec-dettagli-pratica #det-device-image-lbl,
        body.mobile-mode-active #sec-dettagli-pratica #det-timeline,
        body.mobile-mode-active #sec-dettagli-pratica h3,
        body.mobile-mode-active #sec-dettagli-pratica .timeline-container,
        body.mobile-mode-active #sec-dettagli-pratica #det-technician-card {
            display: none !important; /* Hide technical photos, logs, timelines, headers, progress bars */
        }
        body.mobile-mode-active #desktop-qrcode-access {
            display: none !important; /* Hide QR Code within mobile view itself */
        }
        body.mobile-mode-active #demo-floating-trigger {
            display: none !important; /* Hide demo panel on mobile view */
        }

        /* SVG COMPONENT BLUEPRINT STYLING */
        #det-componenti-svg-panel svg {
            transition: var(--transition);
        }
        @keyframes pulse-danger {
            0% { fill: rgba(239, 68, 68, 0.04); stroke-width: 1.8px; }
            50% { fill: rgba(239, 68, 68, 0.28); stroke-width: 2.5px; }
            100% { fill: rgba(239, 68, 68, 0.04); stroke-width: 1.8px; }
        }
        @keyframes pulse-cyan {
            0% { fill: rgba(8, 145, 178, 0.04); stroke-width: 1.8px; }
            50% { fill: rgba(8, 145, 178, 0.28); stroke-width: 2.5px; }
            100% { fill: rgba(8, 145, 178, 0.04); stroke-width: 1.8px; }
        }
        .svg-highlight-guasto {
            animation: pulse-danger 2s infinite ease-in-out;
            stroke: var(--danger) !important;
            filter: drop-shadow(0 0 4px rgba(239, 68, 68, 0.5));
        }
        .svg-highlight-sostituito {
            animation: pulse-cyan 2s infinite ease-in-out;
            stroke: var(--cyan) !important;
            filter: drop-shadow(0 0 4px rgba(8, 145, 178, 0.5));
        }
        .svg-highlight-ok {
            stroke: var(--success) !important;
            fill: rgba(22, 163, 74, 0.04) !important;
        }

        @media (min-width: 992px) {
            #det-componenti-layout-grid {
                grid-template-columns: 240px 1fr !important;
            }
        }
        
        @keyframes pulseGreen {
            0% { transform: scale(0.95); opacity: 0.7; }
            50% { transform: scale(1.15); opacity: 1; }
            100% { transform: scale(0.95); opacity: 0.7; }
        }
        .pulse-green {
            animation: pulseGreen 1.6s infinite ease-in-out;
        }

        /* ============================================= */
        /*          DARK MODE — COMPLETE THEME           */
        /* ============================================= */
        body.dark-mode {
            --bg-body: #0f172a;
            --bg-card: rgba(30, 41, 59, 0.85);
            --bg-sidebar: rgba(15, 23, 42, 0.95);
            --border-color: rgba(255, 255, 255, 0.08);
            --text-main: #e2e8f0;
            --text-muted: #94a3b8;
            --primary: #60a5fa;
            --primary-hover: #3b82f6;
            --primary-light: rgba(96, 165, 250, 0.15);
            --success: #34d399;
            --success-light: rgba(52, 211, 153, 0.15);
            --warning: #fbbf24;
            --warning-light: rgba(251, 191, 36, 0.15);
            --danger: #f87171;
            --danger-light: rgba(248, 113, 113, 0.15);
            --cyan: #22d3ee;
            --shadow-elevation-1: 0 2px 8px rgba(0,0,0,0.3), 0 0 2px rgba(0,0,0,0.2);
            --shadow-elevation-4: 0 16px 40px rgba(0,0,0,0.5), 0 0 4px rgba(0,0,0,0.3);
            background-color: var(--bg-body);
            background-image: radial-gradient(circle at 15% 50%, rgba(96, 165, 250, 0.06), transparent 25%),
                              radial-gradient(circle at 85% 30%, rgba(34, 211, 238, 0.04), transparent 25%);
            color: var(--text-main);
        }

        /* Header & Nav */
        body.dark-mode header {
            background-color: var(--bg-sidebar);
            border-bottom-color: var(--border-color);
            box-shadow: 0 1px 6px rgba(0,0,0,0.3);
        }
        body.dark-mode .nav-btn:hover,
        body.dark-mode .nav-btn.active {
            background-color: rgba(255, 255, 255, 0.08);
            color: var(--text-main);
        }

        /* Cards */
        body.dark-mode .glass-card {
            background: var(--bg-card);
            border-color: var(--border-color);
            border-top-color: rgba(255, 255, 255, 0.06);
        }
        body.dark-mode .glass-card:hover {
            border-color: rgba(255, 255, 255, 0.12);
        }

        /* KPI Cards */
        body.dark-mode .kpi-card {
            background: rgba(30, 41, 59, 0.9);
            border-color: var(--border-color);
        }

        /* Form Elements */
        body.dark-mode input,
        body.dark-mode select,
        body.dark-mode textarea {
            background-color: rgba(15, 23, 42, 0.6);
            border-color: var(--border-color);
            color: var(--text-main);
        }
        body.dark-mode input:focus,
        body.dark-mode select:focus,
        body.dark-mode textarea:focus {
            background-color: rgba(15, 23, 42, 0.8);
            border-color: var(--primary);
            box-shadow: 0 0 10px rgba(96, 165, 250, 0.15);
        }
        body.dark-mode input::placeholder,
        body.dark-mode textarea::placeholder {
            color: var(--text-muted);
        }

        /* Buttons */
        body.dark-mode .btn-secondary {
            background-color: rgba(51, 65, 85, 0.7);
            color: var(--text-main);
            border-color: var(--border-color);
        }
        body.dark-mode .btn-secondary:hover {
            background-color: rgba(71, 85, 105, 0.7);
        }

        /* Tables */
        body.dark-mode th {
            border-bottom-color: var(--border-color);
            color: var(--text-muted);
        }
        body.dark-mode td {
            border-bottom-color: var(--border-color);
        }
        body.dark-mode tr:hover td {
            background-color: rgba(255, 255, 255, 0.04);
        }

        /* Defect Items */
        body.dark-mode .defect-item {
            background: rgba(30, 41, 59, 0.5);
            border-color: var(--border-color);
        }
        body.dark-mode .defect-item:hover {
            background: rgba(51, 65, 85, 0.5);
            border-color: var(--primary);
        }

        /* Badges */
        body.dark-mode .badge-info { background-color: rgba(96, 165, 250, 0.15); color: #93bbfd; }
        body.dark-mode .badge-success { background-color: rgba(52, 211, 153, 0.15); color: #6ee7b7; }
        body.dark-mode .badge-warning { background-color: rgba(251, 191, 36, 0.15); color: #fcd34d; }
        body.dark-mode .badge-danger { background-color: rgba(248, 113, 113, 0.15); color: #fca5a5; }
        body.dark-mode .badge-cyan { background-color: rgba(34, 211, 238, 0.15); color: #67e8f9; }

        /* Timeline */
        body.dark-mode .timeline {
            border-left-color: rgba(255, 255, 255, 0.1);
        }
        body.dark-mode .timeline-item::before {
            border-color: var(--bg-body);
        }

        /* Scrollbar */
        body.dark-mode ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        body.dark-mode ::-webkit-scrollbar-track {
            background: rgba(15, 23, 42, 0.5);
        }
        body.dark-mode ::-webkit-scrollbar-thumb {
            background: rgba(148, 163, 184, 0.3);
            border-radius: 4px;
        }
        body.dark-mode ::-webkit-scrollbar-thumb:hover {
            background: rgba(148, 163, 184, 0.5);
        }

        /* Dark Mode Toggle Button itself */
        body.dark-mode #dark-mode-toggle {
            background: rgba(255, 255, 255, 0.08) !important;
            border-color: var(--border-color) !important;
        }

        /* Online Users Pill */
        body.dark-mode #online-users-pill {
            background: rgba(52, 211, 153, 0.1) !important;
            border-color: rgba(52, 211, 153, 0.2) !important;
        }
        body.dark-mode #online-users-dropdown {
            background: #1e293b !important;
            border-color: var(--border-color) !important;
        }

        /* Clock */
        body.dark-mode [id="crm-realtime-clock"] {
            color: var(--text-main) !important;
        }

        /* Floating Support Widget */
        body.dark-mode #floating-support-panel {
            background: #1e293b !important;
            border-color: var(--border-color) !important;
        }
        body.dark-mode #fs-chat-history {
            background: rgba(15, 23, 42, 0.6) !important;
        }
        body.dark-mode #fs-chat-history > div {
            background: rgba(51, 65, 85, 0.7) !important;
            color: var(--text-main) !important;
        }
        body.dark-mode #fs-chat-input {
            background: rgba(15, 23, 42, 0.6) !important;
            border-color: var(--border-color) !important;
            color: var(--text-main) !important;
        }

        /* Lookup section */
        body.dark-mode .lookup-box input {
            background-color: rgba(15, 23, 42, 0.6);
        }

        /* Generic inline-style overrides for common patterns */
        body.dark-mode [style*="background: #ffffff"],
        body.dark-mode [style*="background:#ffffff"],
        body.dark-mode [style*="background: white"],
        body.dark-mode [style*="background-color: #fff"] {
            background: rgba(30, 41, 59, 0.9) !important;
            color: var(--text-main) !important;
        }
        body.dark-mode [style*="background: #f8fafc"],
        body.dark-mode [style*="background:#f8fafc"],
        body.dark-mode [style*="background-color: #f8fafc"] {
            background: rgba(15, 23, 42, 0.5) !important;
        }
        body.dark-mode [style*="background: #f1f5f9"],
        body.dark-mode [style*="background:#f1f5f9"],
        body.dark-mode [style*="background-color: #f1f5f9"] {
            background: rgba(30, 41, 59, 0.6) !important;
        }
        body.dark-mode [style*="color: #1e293b"],
        body.dark-mode [style*="color:#1e293b"] {
            color: var(--text-main) !important;
        }
        body.dark-mode [style*="color: #334155"],
        body.dark-mode [style*="color:#334155"] {
            color: var(--text-main) !important;
        }
        body.dark-mode [style*="color: #64748b"],
        body.dark-mode [style*="color:#64748b"] {
            color: var(--text-muted) !important;
        }

        /* Admin tabs */
        body.dark-mode .admin-tabs button {
            color: var(--text-muted);
        }
        body.dark-mode .admin-tabs button:hover {
            color: var(--text-main);
        }