:root{color-scheme:light;--ink: #061728;--muted: #596878;--line: #d7e2ec;--soft: #eef8ff;--water: #0a84d8;--water-dark: #061e35;--sun: #16a1ff;--pop: #ffcf4a;--coral: #ff6b65;--leaf: #11a981;--white: #ffffff;--panel: #f7fbff;--night: #041120;--shadow: 0 20px 55px rgba(6, 23, 40, .14);--lift: 0 14px 34px rgba(10, 132, 216, .16)}*{box-sizing:border-box}html{scroll-behavior:smooth}.bih-app{display:flex;flex-direction:column;min-height:100vh;color:var(--ink);background:var(--white);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5}.bih-main{flex:1}.bih-app a{color:inherit;text-decoration:none}.bih-app button,.bih-app input,.bih-app select,.bih-app textarea{font:inherit}.site-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:14px clamp(18px,4vw,52px);background:#ffffffe6;border-bottom:1px solid 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