:root{--night-950:#06111f;--night-900:#071525;--night-800:#0c2138;--night-700:#173653;--amber:#f2ae3d;--amber-light:#ffd88a;--ivory:#f7f0df;--ivory-deep:#e8ddc5;--ink:#11243a;--ink-soft:#43546a;--line:#11243a2e;--night-line:#f7f0df38;--shell:min(100% - 2rem, 76rem);--section-space:clamp(4rem, 9vw, 8rem);--sans:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;--serif:"Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:5.5rem}body{background:var(--ivory);color:var(--ink);font-family:var(--sans);text-rendering:optimizelegibility;margin:0;font-size:1rem;line-height:1.7;overflow-x:hidden}img{max-width:100%;display:block}a{color:inherit;text-underline-offset:.2em}button,input{font:inherit}a,button,summary{touch-action:manipulation}a,button,.copy-channel__row input{min-height:44px}:focus-visible{outline:3px solid 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