body {
    margin: 0;
    touch-action: none;
    overflow: hidden;
    display: grid;
    user-select: none;
}
canvas {
    width: 100%;
    height: auto;
    object-fit: contain;
}
body > * {
    grid-row: 1;
    grid-column: 1;
}
main {
    display: grid;
}
main > * {
    grid-row: 1;
    grid-column: 1;
}
article {
    position: relative;
    align-self: center;
    justify-self: center;
    width: 18ch;
    font: bold 20px/1 system-ui;
    color: #b5b5b5;
    text-rendering: optimizeLegibility;
}
article > h2 {
    font-size: 2em;
    opacity: 0;
    animation: fade-in 10s forwards 0s;
    margin: 0;
    line-height: 1.6;
}
article > p {
    opacity: 0;
    animation: fade-in 10s forwards 4s;
    margin: 0;
    line-height: 1.2;
}
article > p::before {
    opacity: 0;
    animation: fade-in 10s forwards 8s;
}
article > p::after {
    opacity: 0;
    animation: fade-in 10s forwards 8s;
}
article:nth-of-type(2) {
    margin-left: 5ch;
    text-align: right;
}
article:nth-of-type(3) {
    margin-left: 15ch;
}
article:nth-of-type(3) > h2 {
    text-align: center;
    line-height: 100%;
    margin: 0;
}
article:nth-of-type(3) > p {
    position: relative;
    font-size: 60px;
    line-height: 100%;
    margin: 0;
    color: #c51;
}
@media screen and (min-width: 600px) {
    article:nth-of-type(3) > p::before {
        content: "";
        position: absolute;
        height: 100vh;
        width: 100vw;
        border-top: 2px solid transparent;
        border-left: 2px solid transparent;
        border-image: linear-gradient(315deg, #b5b5b5, transparent) 1;
        left: -80px;
        top: -65px;
    }
    article:nth-of-type(3) > p::after {
        content: "";
        position: absolute;
        height: 100vh;
        width: 100vw;
        border-bottom: 2px solid transparent;
        border-right: 2px solid transparent;
        border-image: linear-gradient(135deg, #b5b5b5, transparent) 1;
        right: -80px;
        bottom: -55px;
    }
}
.hide > *,
.hide > *::before,
.hide > *::after {
    animation: fade-out 1s forwards 0s;
}
.hidden {
    visibility: hidden;
}
@keyframes fade-in {
    80% {
        transform: scale(0.8);
        opacity: 0;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}
@keyframes fade-out {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}
#bottomButton {
    position: fixed;
    bottom: 0; /* 贴合底部 */
    left: 0;
    width: 100%; /* 占满整个屏幕宽度 */
    height: 200px; /* 按钮高度，可调整 */
    font-size: 50px;
    font-weight: bold;
    color: rgba(255, 255, 255, 0.3); /* 字体颜色 */
    background: transparent; /* 无填充颜色 */
    border: 32px solid rgba(200, 200, 200, 0.0); /* 灰色边框 */
    cursor: pointer;
    text-align: center;
    line-height: 50px; /* 让文本垂直居中 */
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 悬停时改变样式 */
#bottomButton:hover {
    background: rgba(200, 200, 200, 0.1); /* 悬停时填充灰色 */
    color: rgba(00, 00, 00, 0.3); /* 悬停时文字变黑 */
}

/* 背景层 */
#backgroundLogo {
    position: fixed; /* 固定在屏幕上 */
    top: 50%;
    left: 50%;
    width: 800px; /* 控制 Logo 大小 */
    height: 800px;
    transform: translate(-50%, -50%); /* 确保 Logo 完全居中 */
    opacity: 0.02; /* 让 Logo 变淡 */
    pointer-events: none; /* 确保 Logo 不会影响交互 */


    filter: invert(1) grayscale(1); /* 反转颜色 + 灰度化，变成白色 */
}