/* ==============================
   项目21：方形变换Loading
   Square Morphing Loader
   ============================== */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: #000;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    text-align: center;
}

/* ========== 标题样式 ========== */
header {
    margin-bottom: 60px;
}

.title {
    font-size: 2.5rem;
    color: #fff;
    margin-bottom: 10px;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
}

/* ========== Loading容器 ========== */
.loader-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
}

/* ========== Loading动画（原始代码）========== */
/* From Uiverse.io by alexruix */
.loader {
    width: 112px;
    height: 112px;
    position: relative;
}

.box1,
.box2,
.box3 {
    border: 16px solid #f5f5f5;
    box-sizing: border-box;
    position: absolute;
    display: block;
}

.box1 {
    width: 112px;
    height: 48px;
    margin-top: 64px;
    margin-left: 0px;
    animation: abox1 4s 1s forwards ease-in-out infinite;
}

.box2 {
    width: 48px;
    height: 48px;
    margin-top: 0px;
    margin-left: 0px;
    animation: abox2 4s 1s forwards ease-in-out infinite;
}

.box3 {
    width: 48px;
    height: 48px;
    margin-top: 0px;
    margin-left: 64px;
    animation: abox3 4s 1s forwards ease-in-out infinite;
}

/* ========== 动画定义 ========== */

@keyframes abox1 {
    0% {
        width: 112px;
        height: 48px;
        margin-top: 64px;
        margin-left: 0px;
    }

    12.5% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 0px;
    }

    25% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 0px;
    }

    37.5% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 0px;
    }

    50% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 0px;
    }

    62.5% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 0px;
    }

    75% {
        width: 48px;
        height: 112px;
        margin-top: 0px;
        margin-left: 0px;
    }

    87.5% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 0px;
    }

    100% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 0px;
    }
}

@keyframes abox2 {
    0% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 0px;
    }

    12.5% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 0px;
    }

    25% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 0px;
    }

    37.5% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 0px;
    }

    50% {
        width: 112px;
        height: 48px;
        margin-top: 0px;
        margin-left: 0px;
    }

    62.5% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 64px;
    }

    75% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 64px;
    }

    87.5% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 64px;
    }

    100% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 64px;
    }
}

@keyframes abox3 {
    0% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 64px;
    }

    12.5% {
        width: 48px;
        height: 48px;
        margin-top: 0px;
        margin-left: 64px;
    }

    25% {
        width: 48px;
        height: 112px;
        margin-top: 0px;
        margin-left: 64px;
    }

    37.5% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 64px;
    }

    50% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 64px;
    }

    62.5% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 64px;
    }

    75% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 64px;
    }

    87.5% {
        width: 48px;
        height: 48px;
        margin-top: 64px;
        margin-left: 64px;
    }

    100% {
        width: 112px;
        height: 48px;
        margin-top: 64px;
        margin-left: 0px;
    }
}

/* ========== Loading文本 ========== */
.loading-text {
    font-size: 1.2rem;
    color: #fff;
    font-weight: 500;
    letter-spacing: 2px;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
}

/* ========== 页脚 ========== */
footer {
    margin-top: 60px;
}

footer p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .loading-text {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    header {
        margin-bottom: 40px;
    }

    .loader-container {
        gap: 30px;
    }
}