:root{color-scheme:light;font-family:Segoe UI,Arial,sans-serif;color:#172026;background:#f4f7f6;--surface: #ffffff;--surface-alt: #eef4f2;--border: #d7e1df;--border-strong: #bacac7;--text-muted: #5b6b66;--brand: #173f43;--brand-strong: #0d6b61;--accent: #b87913;--danger: #a23a35;--success: #207b55;--focus: #216fb5}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:#f4f7f6}button,input,select,textarea{font:inherit}a{color:#0b665d}h1,h2,h3,p{margin-top:0}h1{margin-bottom:0;font-size:28px;line-height:1.2}h2{margin-bottom:0;font-size:17px}input,select{min-height:38px;width:100%;padding:7px 10px;color:#172026;background:#fff;border:1px solid var(--border-strong);border-radius:6px}input:focus,select:focus,button:focus,a:focus{outline:2px solid var(--focus);outline-offset:2px}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.62}.app-header{position:sticky;top:0;z-index:10;display:grid;grid-template-columns:auto minmax(0,1fr) 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