* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", sans-serif;
    background-color: #111;
    color: var(--text-primary);
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    transition: background-color 1s var(--ease-out), color 1s var(--ease-out);
    position: relative;
}

#bg-layer-color {
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, #222, #000);
    opacity: 0.4;
    z-index: -2;
    transition: background 1s var(--ease-out);
}

#bg-layer-img {
    position: fixed;
    inset: -60px;
    background-size: cover;
    background-position: center;
    filter: blur(90px) brightness(0.6);
    opacity: 0.6;
    z-index: -1;
    transition: opacity 1s var(--ease-out);
}

body.light-mode #bg-layer-img {
    filter: blur(90px) brightness(1.1) saturate(1.1);
    opacity: 0.4;
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    background-image: var(--noise);
    opacity: 0.04;
    pointer-events: none;
    z-index: 0;
    mix-blend-mode: overlay;
}