:root {
            --nav-height: 10vw;
            --title-height: 19vw; 
            --total-header-height: calc(var(--nav-height) + var(--title-height));
        }

        body {
            margin: 0;
            font-family: "Heiti SC", "Microsoft YaHei", sans-serif;
            background-color: #f7c707;
            color: black;
            padding-top: var(--total-header-height);
        }

        /* 1. The Fixed Navigation Banner */
        .mobile-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background-color: #f7c707;
            z-index: 10;
            display: flex;
            justify-content: space-around;
            align-items: center;
        }

        .mobile-nav a {
            font-size: 4vw;
            font-weight: bold;
            color: black;
            text-decoration: none;
        }
        
        /* 2. The Fixed "兰岛设计" Title */
        .mobile-title {
            position: fixed;
            top: var(--nav-height);
            left: 0;
            width: 100%;
            height: var(--title-height);
            background-color: #f7c707;
            z-index: 9;
            display: flex;
padding: 0 0 5vw 0;
            align-items: center;
            justify-content: center;
            overflow: hidden; 
        }

        .mobile-title h1 {
            margin: 0;
            line-height: 1;
            white-space: nowrap;
            font-size: 18.5vw; 
            font-weight: normal; 
            transform: scaleX(1.3); 
        }
        
        .mobile-title a {
            text-decoration: none;
            color: inherit;
        }