:root {
    --loader-primary: #0066cc;
    --loader-secondary: #00aaff;
    --loader-tertiary: #004d99;
}

#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.85);
    z-index: 10000;
}

#loader {
    display: block;
    position: relative;
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 7px solid transparent;
    border-top-color: var(--loader-primary);
    animation: spin 2s linear infinite;
}

#loader:before {
    content: "";
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border-radius: 50%;
    border: 7px solid transparent;
    border-top-color: var(--loader-secondary);
    animation: spin 3s linear infinite;
}

#loader:after {
    content: "";
    position: absolute;
    top: 15px;
    left: 15px;
    right: 15px;
    bottom: 15px;
    border-radius: 50%;
    border: 7px solid transparent;
    border-top-color: var(--loader-tertiary);
    animation: spin 1.5s linear infinite;
}

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