*{box-sizing:border-box}:root{--bg: #fafbfc;--card: #fff;--line: #e5e7eb;--ink: #1a202c;--mut: #6b7280;--accent: #003CA6;--accent-ink: #fff}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.45 -apple-system,Segoe UI,system-ui,sans-serif;-webkit-tap-highlight-color:transparent;-webkit-font-smoothing:antialiased}button{font:inherit;cursor:pointer}input,select{font:inherit;color:inherit}button:focus-visible,input:focus-visible,a:focus-visible,[role=dialog] :focus-visible{outline:2px solid var(--accent);outline-offset:2px}.center{display:grid;place-items:center;height:100vh;color:var(--mut)}.hint{color:var(--mut);font-size:13px;margin:4px 0}.opt{color:var(--mut);font-weight:400;font-size:12px}.app{max-width:640px;margin:0 auto}header{position:sticky;top:0;z-index:5;background:#ffffffe6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;justify-content:space-between;align-items:center;padding:13px 16px;border-bottom:1px solid 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