body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
}

.app {
    position: relative;
    width: 100%;
    height: 100%;
    background-color: #3c3b39;
    display: flex;
    justify-content: center;
    align-items: center;
}

.brightness-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: black;
    opacity: 0; /* fully bright */
    pointer-events: none; /* allow interactions below */
    transition: opacity 0.2s ease;
    z-index: 2;
}

.sun {
    width: 65vw;
    height: 65vw;
    max-width: 65vh;
    max-height: 65vh;
    background: linear-gradient(135deg, #fff6d6 0%, #fbcc7a 100%);
    border-radius: 50%;
    box-shadow:
        0 0 60px 20px #ffe9b380,
        0 0 120px 40px #ffd58060,
        0 0 200px 60px #fcb04540;
    margin: 40px auto;
    transition: all 0.3s ease;
    display: block;
}