/* Modern Frutiger Aero Theme - White, Blue, Green, & Orange */
            body {
                font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
                /* Soft, optimistic gradient: clean white, pale aero blue, and a hint of mint */
                background: linear-gradient(135deg, #f0f9ff 0%, #d4f1f9 40%, #e8f5e9 80%, #ffffff 100%);
                background-attachment: fixed;
                color: #37474f; 
            }
            
            /* Glassmorphism Navbar with White Base */
            #mainNav {
                background: rgba(255, 255, 255, 0.85);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                border-bottom: 1px solid rgba(255, 255, 255, 0.9);
                box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
            }
            #mainNav .navbar-brand {
                color: #0059b3 !important; /* Aero Blue */
                font-weight: 700;
                letter-spacing: 0.5px;
            }
            #mainNav .nav-link {
                color: #546e7a !important;
                font-weight: 600;
                transition: color 0.2s ease;
            }
            #mainNav .nav-link:hover {
                color: #ff9800 !important; /* Energetic Orange on hover */
            }

            /* Airy, Optimistic Header */
            .masthead {
                padding-top: 11rem;
                padding-bottom: 7rem;
                text-align: center;
                background: radial-gradient(circle at top center, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0) 100%);
            }
            .site-heading h1 {
                font-size: 4.5rem;
                font-weight: 800;
                color: #1a365d; /* Deep Blue Slate */
                letter-spacing: -1.5px;
                text-shadow: 0px 4px 15px rgba(255, 255, 255, 0.8);
            }
            .site-heading .subheading {
                font-size: 1.5rem;
                font-weight: 600;
                display: block;
                margin-top: 10px;
                color: #4caf50; /* Vibrant Green */
            }

            /* Content Cards - Clean White Glass */
            .glass-card {
                background: rgba(255, 255, 255, 0.85);
                backdrop-filter: blur(15px);
                -webkit-backdrop-filter: blur(15px);
                border: 1px solid #ffffff;
                border-radius: 12px;
                padding: 3rem;
                margin-bottom: 2.5rem;
                box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04), 
                            inset 0 1px 0 rgba(255, 255, 255, 1); 
                border-top: 4px solid #0073e6; /* Grounding the card with Aero Blue */
            }

            h2.section-heading {
                color: #1a365d;
                border-bottom: 2px solid rgba(76, 175, 80, 0.3); /* Green subtle underline */
                padding-bottom: 12px;
                margin-bottom: 25px;
                font-weight: 700;
            }
            
            h2.section-heading i {
                color: #0073e6; /* Aero Blue icons */
                margin-right: 10px;
            }

            h3 {
                font-size: 1.25rem;
                color: #2e7d32; /* Green for sub-headers */
                font-weight: 600;
                margin-top: 20px;
            }

            /* Classic Frutiger Aero Glossy Button (Blue) */
            .btn-glossy {
                background: linear-gradient(180deg, #66b3ff 0%, #3399ff 49%, #0073e6 50%, #0059b3 100%);
                border: 1px solid #004080;
                color: white !important;
                border-radius: 25px;
                padding: 12px 30px;
                text-decoration: none;
                font-weight: 600;
                box-shadow: inset 0px 1px 2px rgba(255, 255, 255, 0.8), 
                            0px 4px 10px rgba(0, 115, 230, 0.3);
                transition: all 0.2s ease-in-out;
                display: inline-block;
                margin-top: 20px;
            }
            .btn-glossy:hover {
                background: linear-gradient(180deg, #80c1ff 0%, #4facfe 49%, #0073e6 50%, #0059b3 100%);
                box-shadow: inset 0px 1px 2px rgba(255, 255, 255, 0.9), 
                            0px 6px 15px rgba(0, 115, 230, 0.4);
                transform: translateY(-2px);
            }

            /* Footer */
            footer {
                background: rgba(255, 255, 255, 0.7);
                padding: 3rem 0 2rem;
                margin-top: 4rem;
                border-top: 1px solid rgba(255, 255, 255, 0.9);
            }
            .fa-stack {
                color: #0073e6; /* Aero Blue */
                transition: all 0.3s ease;
            }
            .fa-stack:hover {
                transform: translateY(-3px) scale(1.1);
                color: #ff9800; /* Icons turn orange on hover */
            }
            .fa-inverse {
                color: white;
            }
            .fa-stack:hover .fa-circle {
                color: #ff9800;
            }
            
            /* Typography Tweaks */
            p, li {
                font-size: 1.05rem;
                line-height: 1.7;
            }
            ul {
                padding-left: 1.5rem;
            }
            li {
                margin-bottom: 10px;
            }