* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
    text-decoration: none;
    transition: 0.25s;
}

body {
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    /*background: #e8ebef;*/

    --color: #E1E1E1;
    background-color: #F3F3F3;
    background-image: linear-gradient(0deg, transparent 24%, var(--color) 25%, var(--color) 26%, transparent 27%,transparent 74%, var(--color) 75%, var(--color) 76%, transparent 77%,transparent),
    linear-gradient(90deg, transparent 24%, var(--color) 25%, var(--color) 26%, transparent 27%,transparent 74%, var(--color) 75%, var(--color) 76%, transparent 77%,transparent);
    background-size: 55px 55px;
}

.container {
    display: flex;
    flex-direction: column;
    gap: 5rem;

    .top {
        display: flex;
        gap: 5rem;
    }

    .bottom {
        display: flex;
        align-items: center;
        gap: 2rem;
    }
}

.fx-layer {
    filter: contrast(3);
}

.box {
    --w: 100px;
    --h: 100px;
    --r: 9999px;
    --tr: 25%;
    z-index: 500;
    position: relative;
    width: var(--w);
    height: var(--h);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: var(--r);
    border: 1px double rgba(51, 51, 51, 0.08);

    box-shadow:
                inset 2px -2px 1px -1px rgba(255, 255, 255, 0.9),
                inset -2px 2px 1px -1px rgba(255, 255, 255, 0.9),
                inset 6px -6px 1px -6px rgba(255, 255, 255, 0.55),
                inset -6px 6px 1px -6px rgba(255, 255, 255, 0.55),
                inset 0 0 2px rgba(0, 0, 0, 0.8),
                0 4px 8px rgba(0, 0, 0, 0.2);

    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(2px);
    cursor: pointer;
    filter: brightness(0.9);

    svg {
        width: 28px;
        filter: drop-shadow(0 25px 3px rgba(102, 102, 102, 0.2));
    }

    span {
        filter:
            drop-shadow(
            0 25px 3px rgba(102, 102, 102, 0.15));
    }

    &:before {
        content: '';
        position: absolute;
        z-index: 1;
        top: 35%;
        left: 50%;
        transform: translateX(-50%);
        width: calc(var(--w) - 16px);
        height: calc(var(--h) - 16px);
        border-radius: var(--r);
        border: 1px solid rgba(0, 0, 0, 0.9);
        filter: blur(8px);
    }

    &:after {
        z-index: 501;
        content: '';
        position: absolute;
        width: var(--w);
        height: var(--h);
        border-radius: var(--r);
        filter: blur(3px);
        background: linear-gradient(
                45deg,
                rgba(255, 255, 255, 0.8) 0%,
                transparent var(--tr),
                transparent calc(100% - var(--tr)),
                rgba(255, 255, 255, 0.8) 100%
        );
    }

    .circle-overlay {
        position: absolute;
        width: calc(var(--w) - 9px);
        height: calc(var(--h) - 9px);
        border: 1px solid rgba(255, 255, 255, 0.2);
        border-radius: var(--r);
        filter: blur(1px);
    }
}

.start-btn {
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;

    span {
        font-size: 33px;
        font-family: "微软雅黑", serif;
        color: #3e3e3e;
    }

    .btn-icon {
        width: 60px;
        height: 60px;
        display: flex;
        justify-content: center;
        align-items: center;
        background: #3e3e3e;
        border-radius: 50%;
        box-shadow: 0 0 6px rgba(0, 0, 0, 0.3);

        svg {
            width: 24px;
            fill: #f5f5f5;
        }
    }
}