@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;400;500&display=swap');

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


/* =======================================================
   BOTÃO VOLTAR AO TOPO - FLUTUANTE
   ======================================================= */
.btn-voltar-topo {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9998;
    width: 50px;
    height: 50px;
    background: var(--btn-entrar-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    backdrop-filter: blur(10px);
    border: 3px solid rgba(255, 255, 255, 0.2);
}

.btn-voltar-topo:hover {
    background: var(--primay-color-azul);
    transform: translateY(-6px) scale(1.08);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.btn-voltar-topo.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Pequeno pulso suave quando aparece */
@keyframes pulseTop {
    0% { box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25); }
    50% { box-shadow: 0 6px 30px rgba(30, 144, 255, 0.4); }
    100% { box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25); }
}

.btn-voltar-topo.show {
    animation: pulseTop 2s infinite;
}

/* Responsivo - em telas pequenas fica um pouco menor */
@media (max-width: 480px) {
    .btn-voltar-topo {
        width: 45px;
        height: 45px;
        font-size: 24px;
        bottom: 20px;
        right: 20px;
    }
}