/* --- estilos responsivos (para tablets e telemóveis) --- */

@media (max-width: 768px) {

    /* --- 2. layout principal (header e footer) --- */
    #menu-hamburguer {
        display: flex;
    }

    header nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--cor-fundo-header);
        flex-direction: column;
        align-items: center;
        padding: 10px 0;
        border-top: 2px solid var(--cor-primaria);
    }

    header nav ul.ativo {
        display: flex;
    }

    header nav ul li {
        margin: 0;
        width: 100%;
    }
    
    header nav ul li a {
        display: block;
        width: 100%;
        padding: 15px 20px;
        text-align: center;
        color: var(--cor-texto-header);
        transition: background-color 0.2s ease-in-out;
    }
    
    header nav ul li a:hover,
    header nav ul li a:focus {
        color: var(--cor-fundo-header);
        background-color: var(--cor-primaria);
    }
    
    /* --- 3. secao inicio (hero) --- */
    #inicio {
        padding-top: 120px;
        min-height: auto;
    }

    section {
        scroll-margin-top: 140px;
    }

    .container-inicio {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }

    .intro-text-container h1 {
        font-size: 1.8em;
    }

    .intro-text-container .subtitulo-inicio {
        border-left: none;
        padding-left: 0;
        border-top: 3px solid var(--cor-secundaria);
        padding-top: 15px;
        margin-top: 15px;
    }

    /* --- 5. secao habilidades --- */
    .container-habilidades-icones {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }

    .skill-item {
        width: 90%;
        max-width: 300px;
    }

    .skill-details {
        opacity: 1;
        max-height: none;
        padding-top: 15px;
    }

    /* --- 6. secao projetos --- */
    .container-projetos-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* --- 9. secao contato --- */
    #contato p {
        font-size: 0.8em;
    }
    
    .container-contato-links {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .link-contato {
        width: 90%;
        max-width: 320px;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        align-items: center;
    }

    .footer-links .link-contato {
        width: 90%;
        max-width: 320px;
        text-align: center;
    }
}