/* ==============================
   项目24：方形路径加载动画
   Square Path Loader
   ============================== */

/* ========== 全局样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
}

/* ========== 加载器容器 ========== */
.loader {
    position: relative;
    width: 96px;
    height: 96px;
    transform: rotate(45deg);
}

/* ========== 方块样式 ========== */
.loader-square {
    position: absolute;
    top: 0;
    left: 0;
    width: 28px;
    height: 28px;
    margin: 2px;
    border-radius: 0px;
    background: white;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    animation: square-animation 10s ease-in-out infinite both;
}

/* ========== 动画延迟 ========== */
.loader-square:nth-of-type(1) {
    animation-delay: 0s;
}

.loader-square:nth-of-type(2) {
    animation-delay: -1.4285714286s;
}

.loader-square:nth-of-type(3) {
    animation-delay: -2.8571428571s;
}

.loader-square:nth-of-type(4) {
    animation-delay: -4.2857142857s;
}

.loader-square:nth-of-type(5) {
    animation-delay: -5.7142857143s;
}

.loader-square:nth-of-type(6) {
    animation-delay: -7.1428571429s;
}

.loader-square:nth-of-type(7) {
    animation-delay: -8.5714285714s;
}

/* ========== 方形路径动画 ========== */
@keyframes square-animation {
    0% {
        left: 0;
        top: 0;
    }

    10.5% {
        left: 0;
        top: 0;
    }

    12.5% {
        left: 32px;
        top: 0;
    }

    23% {
        left: 32px;
        top: 0;
    }

    25% {
        left: 64px;
        top: 0;
    }

    35.5% {
        left: 64px;
        top: 0;
    }

    37.5% {
        left: 64px;
        top: 32px;
    }

    48% {
        left: 64px;
        top: 32px;
    }

    50% {
        left: 32px;
        top: 32px;
    }

    60.5% {
        left: 32px;
        top: 32px;
    }

    62.5% {
        left: 32px;
        top: 64px;
    }

    73% {
        left: 32px;
        top: 64px;
    }

    75% {
        left: 0;
        top: 64px;
    }

    85.5% {
        left: 0;
        top: 64px;
    }

    87.5% {
        left: 0;
        top: 32px;
    }

    98% {
        left: 0;
        top: 32px;
    }

    100% {
        left: 0;
        top: 0;
    }
}