/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /* border: 1px solid #FFFFFF; */
}

html {
    scroll-behavior: smooth;
    /* 缩放单位：1 设计稿px = 视口宽/1920，范围锁定 [1200, 1920] 对应 [0.625, 1]，实时计算 */
    --u: clamp(1200px / 1920, 100vw / 1920, 1920px / 1920);
}

body {
    font-family: "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: #333;
    background: #f5f7fa;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-width: 1200px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color .2s;
}

img {
    max-width: 100%;
    display: block;
    height: 100%;
}

ul {
    list-style: none;
}

.container {
    width: calc(1567 * var(--u));
    min-width: 1200px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}