/* --- CORE VARIABLES & RESET --- */
        :root {
            --primary: #0056b3; /* ISP Blue */
            --primary-dark: #003d80;
            --secondary: #00a8e8; /* Light Blue */
            --accent: #28a745; /* Success Green */
            --warning-bg: #fff8e1;
            --warning-border: #ffe082;
            --warning-text: #856404;
            --info-bg: #e3f2fd;
            --info-text: #0d47a1;
            --text-main: #333333;
            --text-light: #666666;
            --bg-light: #f8f9fa;
            --white: #ffffff;
            --radius: 8px;
            --shadow: 0 4px 6px rgba(0,0,0,0.05);
            --shadow-hover: 0 10px 15px rgba(0,0,0,0.1);
        }

        * { box-sizing: border-box; }

        body {
            margin: 0;
            padding: 0;
            color: var(--text-main);
            line-height: 1.6;
            background-color: var(--white);
        }

        /* --- TYPOGRAPHY --- */
        h1, h2, h3, h4 { margin-top: 0; font-weight: 700; line-height: 1.2; }
        h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
        h2 { font-size: 2rem; color: var(--text-main); }
        p { margin-bottom: 1rem; color: var(--text-light); }

        .text-primary { color: var(--primary); }
        .text-small { font-size: 0.9rem; }
        .text-center { text-align: center; }

        /* --- LAYOUT --- */
        .container {
            margin: 0 auto;
        }

        /* --- HERO SECTION --- */
        .hero {
            background: linear-gradient(135deg, var(--bg-light) 0%, #eef2f5 100%);
            padding: 5rem 0 4rem;
            text-align: center;
            border-bottom: 1px solid #eee;
            
            /* make the background the width of the page */
            width: 100vw;
            margin-left: calc(50% - 50vw);
        }
        .hero h1 { margin-bottom: 1rem; max-width: 800px; margin-left: auto; margin-right: auto; }
        .hero p { font-size: 1.25rem; max-width: 600px; margin: 0 auto 2rem; }

        /* --- TOGGLE SWITCH --- */
        .toggle-container {
            display: flex;
            justify-content: center;
            margin-bottom: 3rem;
            gap: 1rem;
            flex-wrap: wrap; /* Ensure buttons wrap on small screens */
        }
        .toggle-btn {
            background: white;
            border: 2px solid #ddd;
            color: var(--text-light);
            padding: 0.75rem 2rem;
            border-radius: 50px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: all 0.3s ease;
            margin: 0.25rem; /* Add spacing for wrapping */
        }
        .toggle-btn.active {
            border-color: var(--primary);
            background: var(--primary);
            color: white;
            box-shadow: 0 4px 10px rgba(0,86,179, 0.3);
        }

        /* --- TECHNOLOGY EXPLAINER --- */
        .tech-explainer {
            background: var(--info-bg);
            border-left: 5px solid var(--info-text);
            padding: 2rem;
            border-radius: var(--radius);
            margin-bottom: 3rem;
        }
        .tech-explainer h3 { color: var(--info-text); margin-top: 0; }
        .tech-explainer p { color: #002147; }

        /* --- GRID SYSTEM --- */
        .install-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2rem;
            max-width: 1200px;
            margin: 0 auto;
            padding: 1rem;
            justify-items: center;
            margin-bottom: 4rem;
        }

        /* --- CARDS --- */
        .card {
            background: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid #eee;
            display: flex;
            flex-direction: column;
            max-width: initial !important;
        }
        .card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }

        /* Simulated Image Area */
        .card-img-container {
            height: 220px;
            background: #f1f3f5;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            cursor: pointer; /* Indicates clickable */
        }

        /* New Image Class */
        .real-photo {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: opacity 0.5s ease-in-out;
            opacity: 1;
        }
        .real-photo.fade-out {
            opacity: 0;
        }

        /* --- LIGHTBOX (ZOOM) --- */
        #lightbox {
            display: none; /* Hidden by default */
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.9);
            justify-content: center;
            align-items: center;
        }
        .lightbox-content {
            max-width: 90%;
            max-height: 90%;
            border-radius: 4px;
            box-shadow: 0 0 20px rgba(0,0,0,0.5);
        }
        .close-lightbox {
            position: absolute;
            top: 20px;
            right: 30px;
            color: #fff;
            font-size: 40px;
            font-weight: bold;
            cursor: pointer;
            transition: 0.3s;
        }
        .close-lightbox:hover { color: #bbb; }

        .card-body { padding: 1.5rem; flex-grow: 1; }
        .card-title { font-size: 1.25rem; margin-bottom: 0.5rem; color: var(--primary); }
        .feature-list {
            list-style: none;
            padding: 0;
            margin: 1rem 0 0;
        }
        .feature-list li {
            position: relative;
            padding-left: 1.5rem;
            margin-bottom: 0.5rem;
            font-size: 0.95rem;
            color: var(--text-light);
        }
        .feature-list li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--accent);
            font-weight: bold;
        }

        /* --- BUSINESS SECTION SPECIFICS --- */
        .business-card-row {
            display: flex;
            flex-direction: row;
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            margin-bottom: 2rem;
            border-left: 5px solid var(--primary);
        }
        .business-img {
            width: 40%;
            background: #e9ecef;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #adb5bd;
            font-weight: 600;
            overflow: hidden; /* Ensure image stays in bounds */
            cursor: pointer;
        }
        .business-content { padding: 2rem; width: 60%; }

        /* --- OTARD SECTION --- */
        .otard-section {
            background-color: var(--warning-bg);
            border: 1px solid var(--warning-border);
            border-radius: var(--radius);
            padding: 2rem;
            margin-top: 2rem;
            position: relative;
        }
        .otard-header {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1rem;
        }
        .otard-icon {
            font-size: 1.5rem;
        }
        .otard-content p { color: var(--warning-text); }
        .legal-quote {
            font-style: italic;
            border-left: 3px solid var(--warning-border);
            padding-left: 1rem;
            margin: 1rem 0;
            color: #6c5720;
        }

        /* --- INSTALLATION PROCESS SECTION --- */
        .process-section {
            background: #fff;
            padding: 3rem 0;
            margin-top: 3rem;
        }
        .process-title {
            text-align: center;
            margin-bottom: 2.5rem;
            font-size: 1.8rem;
            color: var(--text-main);
        }
        .process-step {
            display: flex;
            gap: 1.5rem;
            margin-bottom: 2rem;
            align-items: flex-start;
        }
        .step-number {
            background: var(--primary);
            color: white;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
            flex-shrink: 0;
            margin-top: 0.1rem;
            box-shadow: 0 4px 6px rgba(0,86,179, 0.2);
        }
        .step-content h4 {
            margin: 0 0 0.5rem 0;
            font-size: 1.15rem;
            color: var(--primary-dark);
        }
        .step-content p {
            margin: 0;
            font-size: 1rem;
            color: var(--text-light);
        }
        .step-contact {
            font-weight: 600;
            color: var(--primary);
        }

        /* --- RESPONSIVE --- */
        @media (max-width: 768px) {
            .business-card-row { flex-direction: column; }
            .business-img, .business-content { width: 100%; }
            .business-img { height: 200px; }
            h1 { font-size: 2rem; }
        }

        /* Utility for SVG Icons */
        .icon { width: 24px; height: 24px; vertical-align: middle; }
        .product-about.about p { max-width: initial !important; }