/* =========================================
           1. VARIABLES & SETUP
           ========================================= */
        :root {
            --primary-color: #336699;       /* 0f172a Deep Navy */
            --secondary-color: #0ea5e9;     /* Bright Blue */
            --accent-color: #f97316;        /* Orange */
            --text-dark: #334155;           /* Charcoal */
            --text-light: #94a3b8;          /* Grey */
            --bg-light: #f8fafc;            /* Off-white */
            /* Typography 
            --font-heading: "Poppins", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            --font-body: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            */
            --font-heading: 'Montserrat', sans-serif;
            --font-body: 'Open Sans', sans-serif;
        }

        body {
            font-family: var(--font-body);
            color: var(--text-dark);
            background-color: var(--bg-light);
            line-height: 1.7;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-heading);
            font-weight: 700;
            color: var(--primary-color);
        }

        a {
            text-decoration: none;
            color: var(--secondary-color);
            transition: all 0.3s ease;
        }

        a:hover {
            color: var(--primary-color);
        }

        /* =========================================
           2. NAVBAR
           ========================================= */
        .navbar {
            background-color: var(--primary-color);
            
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        }

        .navbar-brand {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.5rem;
            color: #fff !important;
        }

        .nav-link {
            color: #cbd5e1 !important;
            font-weight: 500;
            margin-right: 15px;
        }

        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color) !important;
        }

        .dropdown-menu {
            border-top: 3px solid var(--secondary-color);
            border-radius: 0 0 5px 5px;
        }

        /* =========================================
           3. HERO SECTION
           ========================================= */
        .hero-section {
            /* Using a tech/cyber gradient placeholder since we don't have local images in preview */
            background: linear-gradient(rgba(71, 117, 163, 0.9), rgba(71, 117, 163, 0.85)), 
                        url('https://images.unsplash.com/photo-1550751827-4bd374c3f58b?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 60px 0;
            position: relative;
        }

        .hero-title {
            font-size: 3rem;
            margin-bottom: 1rem;
            color: #fff;
        }

        .hero-subtitle {
            font-size: 1.25rem;
            color: #cbd5e1;
            margin-bottom: 2rem;
        }

        .btn-custom-primary {
            background-color: var(--secondary-color);
            color: white;
            padding: 12px 30px;
            border-radius: 5px;
            font-weight: 600;
            border: none;
        }

        .btn-custom-primary:hover {
            background-color: #0284c7;
            color: white;
            transform: translateY(-2px);
        }

        /* =========================================
           4. COMPONENTS (Cards, Sections)
           ========================================= */
        .section-padding {
            padding: 60px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
        }

        .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--secondary-color);
            margin: 15px auto 0;
        }

        .feature-card {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: transform 0.3s ease;
            border-bottom: 3px solid transparent;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            border-bottom: 3px solid var(--secondary-color);
        }

        .feature-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }

        /* =========================================
           5. FOOTER
           ========================================= */
        .site-footer {
            background-color: var(--primary-color);
            color: #cbd5e1;
            padding: 60px 0 20px;
        }

        .site-footer h5 {
            color: white;
            margin-bottom: 20px;
        }

        .site-footer a {
            color: #cbd5e1;
        }

        .site-footer a:hover {
            color: var(--secondary-color);
        }

        .footer-bottom {
            border-top: 1px solid #1e293b;
            margin-top: 40px;
            padding-top: 20px;
            text-align: center;
            font-size: 0.9rem;
        }
        
        /* Helper for the mock image */
        .mock-image {
            width: 100%;
            height: 400px;
            background-color: #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #64748b;
            border-radius: 8px;
        }