/*
=================================
字体
=================================
*/

@font-face {
    font-family: "PixelFont";
    src: url("fonts/pixel-font.otf") format("opentype");
    font-weight: normal;
    font-style: normal;
}


/*
=================================
基础
=================================
*/

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    width: 100%;
    height: 100%;
}

body {
    background: black;
    color: white;
    overflow: hidden;
}


/*
=================================
整个场景
=================================
*/

#scene {
    position: relative;

    width: 100vw;
    height: 100vh;

    display: flex;
    justify-content: center;
    align-items: center;

    background: black;

    overflow: hidden;

    cursor: pointer;

    touch-action: manipulation;
}


/*
=================================
沙漠背景
=================================
*/

#desert {
    position: absolute;

    inset: 0;

    width: 100%;
    height: 100%;

    background-image: url("images/desert.png");
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;

    opacity: 0;

    transition: opacity 2.5s ease;

    z-index: 0;
}

#desert.show {
    opacity: 1;
}


/*
=================================
第一幕文字
=================================
*/

#text {
    position: relative;

    z-index: 4;

    font-family: "PixelFont", sans-serif;

    font-size: 38px;

    text-align: center;

    padding: 20px;

    user-select: none;

    opacity: 0;

    transition: opacity 1.5s ease;
}

#text.show {
    opacity: 1;
}


/*
=================================
蛇是神的珠宝
=================================
*/

#desert-title {
    position: absolute;

    top: 18%;
    left: 50%;

    transform: translateX(-50%);

    width: 100%;

    z-index: 3;

    font-family: "PixelFont", sans-serif;

    font-size: 56px;

    text-align: center;

    user-select: none;

    pointer-events: none;

    opacity: 0;

    transition: opacity 2.5s ease;
}

#desert-title.show {
    opacity: 1;
}


/*
=================================
蛇的 Canvas
=================================
*/

#snake-canvas {
    position: absolute;

    left: 0;
    top: 34%;

    width: 100%;
    height: 66%;

    z-index: 2;

    opacity: 0;

    transition: opacity 2.5s ease;

    pointer-events: none;

    touch-action: none;
}

#snake-canvas.show {
    opacity: 1;

    pointer-events: auto;
}


/*
=================================
手机
=================================
*/

@media (max-width: 600px) {

    #text {
        font-size: 28px;
        padding: 30px;
    }

    #desert-title {
        top: 16%;

        font-size: 40px;

        padding: 0 20px;
    }

    #snake-canvas {
        top: 31%;
        height: 69%;
    }

}