:root{color-scheme:light dark;--ink: #081e37;--cream: #fff7df;--paper: #ffffff;--sky: #bfe7ff;--coral: #f4513b;--yellow: #ffd848;--shadow: 0 24px 60px rgba(8, 30, 55, .2);font-family:Arial Rounded MT Bold,PingFang SC,Microsoft YaHei,system-ui,sans-serif;color:var(--ink);background:var(--cream);scroll-behavior:smooth}html{overflow-x:clip}*{box-sizing:border-box}body{margin:0;background:var(--cream);overflow-x:hidden}img,video{display:block;max-width:100%}a{color:inherit}button,a{-webkit-tap-highlight-color:transparent}.skip-link{position:fixed;left:1rem;top:-5rem;z-index:100;background:var(--ink);color:#fff;padding:.8rem 1rem}.skip-link:focus{top:1rem}.lang-en{display:none}html[data-lang=en] .lang-en{display:initial}html[data-lang=en] .lang-zh{display:none}.site-header{position:fixed;inset:0 0 auto;z-index:20;height:74px;padding:0 clamp(1rem,4vw,4.5rem);display:flex;align-items:center;justify-content:space-between;gap:2rem;background:#ffffffeb;border-bottom:1px solid 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