#preloader {
    display: none;
    position: fixed;
    background-color: white;
    opacity: 0.7;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
}

/* Mensagem */
#preloader-msg {
    display: none;
    position: fixed;
    top: 50%;
    left: 0;
    right: 0;
    color: #555;
    font-size: medium;
    font-weight: bold;
    margin: 50px auto;
    text-align: center;
    width: 300px;
    z-index: 999;
}

/* Anel principal (suave, tons de cinza) */
#preloader #preloader-inner {
    display: block;
    position: relative;
    left: 0;
    right: 0;
    margin: -75px auto;
    top: 50%;
    width: 100px;
    height: 100px;
    border-radius: 50%;

    border: 5px solid #e0e0e0;       /* cinza claro */
    border-top-color: #8e8e8e;       /* cinza escuro para contraste */

    animation: spin 1s linear infinite;
}

/* Removidos os anéis coloridos internos */
#preloader #preloader-inner:before,
#preloader #preloader-inner:after {
    content: none !important;
}

/* Animação */
@keyframes spin {
    0%   { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}