:root {
            /* Vibrant, Non-Blue Professional Palette */
            --primary: #6D28D9; /* Royal Purple */
            --primary-light: #8B5CF6; /* Bright Purple */
            --secondary: #EC4899; /* Vibrant Rose/Coral */
            --accent: #10B981; /* Emerald Green for positive accents */
            --bg-light: #FAF5FF; /* Very soft purple-tinted white */
            --text-dark: #1F2937; /* Charcoal */
            --text-muted: #4B5563; /* Medium Gray */
            --white: #FFFFFF;
            --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 10px 15px -3px rgba(109, 40, 217, 0.1);
            --shadow-hover: 0 20px 25px -5px rgba(109, 40, 217, 0.15);
            --radius: 12px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Poppins', sans-serif;
        }

        body {
            background-color: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Glassmorphism Header */
        header {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.3);
            z-index: 1000;
            padding: 1rem 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: var(--shadow-sm);
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-decoration: none;
        }

        .nav-links {
            display: flex;
            gap: 1.5rem;
            align-items: center;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 500;
            transition: color 0.3s ease;
        }

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

        .btn {
            padding: 0.6rem 1.5rem;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            cursor: pointer;
            border: none;
            display: inline-block;
        }

        .btn-outline {
            border: 2px solid var(--primary);
            color: var(--primary);
            background: transparent;
        }

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

        .btn-gradient {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            box-shadow: var(--shadow-md);
        }

        .btn-gradient:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
            color: var(--white);
        }

        .profile-icon {
            width: 40px;
            height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 999px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            text-decoration: none;
            box-shadow: var(--shadow-sm);
        }

        .profile-icon:hover {
            color: var(--white);
        }

        /* Hero Section */
        .hero {
            padding: 180px 5% 100px;
            text-align: center;
            max-width: 1000px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 3.5rem;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            color: var(--text-dark);
        }

        .hero h1 span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--text-muted);
            margin-bottom: 2.5rem;
            max-width: 700px;
            margin-inline: auto;
        }

        /* Features/Tests Grid */
        .features-section {
            padding: 5rem 5%;
            background: var(--white);
        }

        .section-title {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: 3rem;
            color: var(--text-dark);
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        .card {
            background: var(--white);
            padding: 2.5rem 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(0,0,0,0.05);
            transition: all 0.4s ease;
            text-align: center;
        }

        .card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-light);
        }

        .card-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, var(--bg-light), #F3E8FF);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin: 0 auto 1.5rem;
        }

        .card h3 {
            font-size: 1.3rem;
            margin-bottom: 1rem;
            color: var(--text-dark);
        }

        .card p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .hero h1 { font-size: 2.5rem; }
            .nav-links { display: none; } /* Add a mobile menu toggle here for production */
        }