body {
            background-color: #f0f2f5;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            padding: 1rem;
            margin: 0;
            font-family: 'Montserrat',"Montserrat Fallback", 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
        }

        /* Premium Business Card Styles */
        #premium-business-card {
            max-width: 380px;
            width: 100%;
            margin: 0 auto;
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2), 0 5px 15px rgba(0, 0, 0, 0.1);
            background: #fff;
            position: relative;
            transform: translateZ(0);
            backface-visibility: hidden;
            isolation: isolate;
        }

        /* Card Header */
        .card-header {
            position: relative;
            background: linear-gradient(135deg, #c70000, #a10000); /* Red gradient theme */
            padding: 2.5rem 1.5rem;
            text-align: center;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .card-header::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 60%);
            transform: rotate(30deg);
            z-index: 1;
        }

        .logo-container {
            width: 90px;
            height: 90px;
            border-radius: 50%;
            background: #fff;
            margin: 0 auto 1.25rem;
            padding: 5px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            overflow: hidden;
            border: 3px solid rgba(255,255,255,0.4);
        }

        .logo {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 50%;
        }

        h1 {
            color: #fff;
            font-size: 1.5rem;
            margin: 0;
            font-weight: 700;
            text-shadow: 0 2px 4px rgba(0,0,0,0.1);
            position: relative;
            z-index: 2;
        }

        .subtitle {
            color: rgba(255,255,255,0.9);
            font-size: 0.9rem;
            margin-top: 0.5rem;
            letter-spacing: 1px;
            font-weight: 500;
            text-transform: uppercase;
            position: relative;
            z-index: 2;
        }

        /* Card Body */
        .card-body {
            background: linear-gradient(to bottom, #f9f9f9, #fff);
            padding: 1.5rem;
        }

        .info-container {
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 10px 20px rgba(0,0,0,0.05);
            background: #fff;
            margin-bottom: 1.5rem;
        }

        .info-item {
            display: flex;
            align-items: center;
            padding: 1rem 1.25rem;
            border-bottom: 1px solid rgba(0,0,0,0.04);
            transition: all 0.3s ease;
        }

        .info-item:last-child { border-bottom: none; }
        .info-item:hover { background-color: rgba(0,0,0,0.01); }

        .info-icon {
            width: 40px;
            height: 40px;
            min-width: 40px;
            border-radius: 12px;
            background: linear-gradient(135deg, #c70000, #a10000); /* Red gradient */
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            box-shadow: 0 4px 8px rgba(199,0,0,0.3); /* Red shadow */
            color: white;
            font-size: 1.25rem;
        }

        .info-text { flex: 1; }
        .info-label {
            font-size: 0.7rem;
            color: #777;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 0.25rem;
            font-weight: 600;
        }
        .info-value {
            font-size: 0.95rem;
            color: #333;
            font-weight: 500;
        }
        a.info-value {
            text-decoration: none;
            color: #333;
            transition: color 0.2s ease;
        }
        a.info-value:hover { color: #c70000; } /* Red hover */

        /* Social Icons */
        .social-container {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        .social-icon {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #fff;
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
            color: #c70000; /* Red icon color */
            font-size: 1.25rem;
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid rgba(0,0,0,0.05);
        }
        .social-icon:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
            background: #c70000; /* Red background on hover */
            color: white;
        }

        /* Action Buttons */
        .primary-action-button {
            width: 100%;
            margin-bottom: 0.75rem;
            display: flex; /* Use Flexbox for centering */
            justify-content: center; /* Center horizontally */
        }
        
        .action-buttons {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 0.75rem;
        }
        .action-button {
            padding: 0.85rem 0.5rem;
            border-radius: 12px;
            font-weight: 600;
            font-size: 0.9rem;
            text-align: center;
            text-decoration: none;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            z-index: 1;
            border: none;
            cursor: pointer;
        }
        .action-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, #b00333, #c70000);
            z-index: -1;
            transition: all 0.3s ease;
        }
        .action-button:hover::before {
             background: linear-gradient(135deg, #444, #666);
        }
        .action-button span { color: white; }
        .action-icon { font-size: 1.1rem; }

        /* Specific Button Colors */
        #add-contact-btn::before { background: linear-gradient(135deg, #c70000, #a10000); } /* Red */
        #add-contact-btn:hover::before { background: linear-gradient(135deg, #a10000, #8a0000); }
        #book-btn::before { background: linear-gradient(135deg, #007bff, #0056b8); } /* Blue */
        #book-btn:hover::before { background: linear-gradient(135deg, #0069d9, #004294); }

        /* Pulse effect for save contact button */
        #add-contact-btn {
            animation: pulse-animation 2s infinite;
        }
        @keyframes pulse-animation {
            0% { box-shadow: 0 0 0 0 rgba(199, 0, 0, 0.7); } /* Red pulse */
            70% { box-shadow: 0 0 0 10px rgba(199, 0, 0, 0); }
            100% { box-shadow: 0 0 0 0 rgba(199, 0, 0, 0); }
        }

        /* Card Footer */
        .card-footer {
            background: #fafafa;
            padding: 1rem;
            text-align: center;
            font-size: 0.75rem;
            color: #888;
            border-top: 1px solid rgba(0,0,0,0.05);
        }
        
        /* Modal for "Add to Home Screen" */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            display: none; /* Hidden by default */
            align-items: center;
            justify-content: center;
            z-index: 1000;
        }
        .modal-content {
            background: white;
            padding: 2rem;
            border-radius: 16px;
            text-align: center;
            max-width: 320px;
            width: 90%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }
        .modal-content h3 { margin-top: 0; }
        .modal-close-btn {
            margin-top: 1.5rem;
            padding: 0.75rem 1.5rem;
            border: none;
            background: #c70000; /* Red */
            color: white;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .modal-close-btn:hover { background: #a10000; } /* Darker Red */

        @media (max-width: 380px) {
           .action-buttons { grid-template-columns: 1fr 1fr 1fr; }
           .action-button { font-size: 0.8rem; gap: 0.3rem;}
        }