@media (max-width: 900px) {
    .header {
        padding: 0 20px;
        justify-content: space-between;
    }

    .hamburger {
        display: block;
        order: 3;
    }

    .plantao-btn {
        order: 1;
        padding: 8px 16px;
        font-size: 0.9rem;
    }

    #nav {
        order: 2;
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #050505;
        flex-direction: column;
        padding: 25px 20px;
        border-top: 1px solid rgba(255,255,255,0.1);
    }

    #nav.open {
        display: flex;
    }

    .sobre {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .areas-grid {
        grid-template-columns: 1fr;
    }

    footer {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }

    /* Cards no mobile */
    .stack-card {
        position: relative;
        top: 0;
        margin: 0 auto 80px;
        width: 92%;
        padding: 30px;
    }

    .cards-container {
        padding: 80px 5% 100px;
    }

    /* Botão WhatsApp no mobile */
    .whatsapp-float {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (min-width: 901px) {
    .hamburger {
        display: none;
    }
}