:root {
            --primary: #ffcc00; /* Amarillo alerta/seguridad */
            --secondary: #1a1a1a; /* Negro profesional */
            --white: #ffffff;
            --accent: #25d366; /* Verde WhatsApp */
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body, html {
            height: 100%;
            font-family: 'Inter', sans-serif;
            background-color: var(--secondary);
            color: var(--white);
            overflow: hidden; /* Evita el scroll */
        }

        /* Contenedor Principal (Hero) */
        .hero {
            height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 20px;
            text-align: center;
            background: radial-gradient(circle at top, #333 0%, #1a1a1a 100%);
        }

        /* Logo o Icono visual */
        .icon-box {
            font-size: 3rem;
            margin-bottom: 1rem;
        }

        h1 {
            font-size: 1.8rem;
            font-weight: 900;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            max-width: 500px;
        }

        h1 span {
            color: var(--primary);
            display: block;
            font-size: 2.2rem;
            margin-top: 0.5rem;
        }

        p {
            font-size: 1rem;
            color: #ccc;
            margin-bottom: 2rem;
            max-width: 400px;
        }

        /* Contenedor de Botones */
        .btn-container {
            width: 100%;
            display: flex;
            flex-direction: column;
            gap: 15px;
            max-width: 350px;
        }

        .btn {
            text-decoration: none;
            padding: 18px;
            border-radius: 12px;
            font-weight: 700;
            font-size: 1.1rem;
            transition: transform 0.2s ease, filter 0.2s ease;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 10px;
        }

        .btn:active {
            transform: scale(0.96);
        }

        /* Estilos específicos de botones */
        .btn-whatsapp {
            background-color: var(--accent);
            color: white;
            box-shadow: 0 4px 15px rgba(37, 211, 102, 0.3);
        }

        .btn-schedule {
            background-color: var(--primary);
            color: var(--secondary);
            box-shadow: 0 4px 15px rgba(255, 204, 0, 0.2);
        }

        /* Media Query para escritorio */
        @media (min-width: 768px) {
            h1 { font-size: 2.5rem; }
            h1 span { font-size: 3rem; }
            .btn-container { flex-direction: row; max-width: 500px; }
            .btn { flex: 1; }
        }