/* ==============================
   项目15：Constellation Loading Animation
   星座连线Loading动画
   ============================== */

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

/* 页面主体 */
body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #070b1a; /* 深蓝色星空背景 */
    overflow: hidden; /* 防止滚动条出现 */
    font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
}

/* ========== Canvas画布 ========== */
canvas {
    display: block; /* 移除Canvas默认的inline间距 */
}

/* ========== 加载信息显示区域 ========== */
.loading-info {
    position: fixed; /* 固定定位 */
    bottom: 10%; /* 距离底部10% */
    left: 50%;
    transform: translateX(-50%); /* 水平居中 */
    text-align: center;
    pointer-events: none; /* 让鼠标事件穿透，不影响Canvas交互 */
}

/* 星座中文名称 */
.constellation-name-cn {
    font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    font-size: 28px;
    color: rgba(200, 230, 255, 0.85);
    letter-spacing: 12px; /* 字母间距 */
    margin-bottom: 4px;
    text-shadow: /* 文字发光效果 */
        0 0 20px rgba(100, 180, 255, 0.4),
        0 0 40px rgba(100, 180, 255, 0.15);
    transition: opacity 0.5s; /* 淡入淡出过渡 */
}

/* 星座英文名称 */
.constellation-name {
    font-family: "Georgia", serif;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.45);
    letter-spacing: 6px;
    margin-bottom: 6px;
    transition: opacity 0.5s;
}

/* 星座描述 */
.constellation-desc {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.28);
    letter-spacing: 3px;
    margin-bottom: 14px;
    min-height: 18px; /* 最小高度，防止文字变化时高度跳动 */
    transition: opacity 0.5s;
}

/* ========== Loading指示器 ========== */
.loading-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px; /* 元素间距 */
}

/* Loading文字 */
.loading-text {
    font-family: "Georgia", serif;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.35);
    letter-spacing: 4px;
    animation: fadeInOut 2.5s ease-in-out infinite; /* 呼吸闪烁动画 */
}

/* 淡入淡出动画 */
@keyframes fadeInOut {
    0%,
    100% {
        opacity: 0.25;
    }
    50% {
        opacity: 0.6;
    }
}

/* Loading点点容器 */
.loading-dots {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* 单个点 */
.loading-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%; /* 圆形 */
    background: rgba(255, 255, 255, 0.5);
    animation: dotBounce 1.4s ease-in-out infinite; /* 弹跳动画 */
}

/* 第2个点延迟 */
.loading-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

/* 第3个点延迟 */
.loading-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

/* 点弹跳动画 */
@keyframes dotBounce {
    0%,
    80%,
    100% {
        transform: scale(0.6); /* 缩小 */
        opacity: 0.3;
    }
    40% {
        transform: scale(1.2); /* 放大 */
        opacity: 1;
    }
}

/* ==============================
   响应式设计
   ============================== */

/* 平板横屏 (≤ 1199px) */
@media (max-width: 1199px) {
    .constellation-name-cn {
        font-size: 24px;
        letter-spacing: 10px;
    }

    .constellation-name {
        font-size: 13px;
        letter-spacing: 5px;
    }

    .constellation-desc {
        font-size: 11px;
        letter-spacing: 2px;
    }
}

/* 平板竖屏 (≤ 768px) */
@media (max-width: 768px) {
    .loading-info {
        bottom: 8%; /* 调整位置 */
    }

    .constellation-name-cn {
        font-size: 20px;
        letter-spacing: 8px;
    }

    .constellation-name {
        font-size: 12px;
        letter-spacing: 4px;
    }

    .constellation-desc {
        font-size: 10px;
        letter-spacing: 2px;
    }

    .loading-text {
        font-size: 12px;
    }
}

/* 手机屏幕 (≤ 576px) */
@media (max-width: 576px) {
    .loading-info {
        bottom: 6%;
        padding: 0 20px; /* 左右留白 */
    }

    .constellation-name-cn {
        font-size: 18px;
        letter-spacing: 6px;
    }

    .constellation-name {
        font-size: 11px;
        letter-spacing: 3px;
    }

    .constellation-desc {
        font-size: 9px;
        letter-spacing: 1px;
        min-height: 16px;
    }

    .loading-text {
        font-size: 11px;
        letter-spacing: 3px;
    }

    .loading-dots span {
        width: 5px;
        height: 5px;
    }
}

/* 小屏手机 (≤ 400px) */
@media (max-width: 400px) {
    .constellation-name-cn {
        font-size: 16px;
        letter-spacing: 4px;
    }

    .constellation-name {
        font-size: 10px;
        letter-spacing: 2px;
    }
}