@font-face{font-family:Atlas;src:local('Segoe UI')}*{box-sizing:border-box}html{scroll-behavior:smooth;--bg:#f4f7fa;--surface:#fff;--text:#14283c;--muted:#596c7c;--line:#dce5ec;--soft:#eaf0f5;--ocean:#dcecf3;--accent:#146bb1;--shadow:0 15px 55px #11273c20;color-scheme:light}html[data-theme=night]{--bg:#0b1421;--surface:#111f30;--text:#eaf2f8;--muted:#a1b4c6;--line:#293c50;--soft:#192c40;--ocean:#112c43;--accent:#70c4ff;--shadow:0 15px 55px #0006;color-scheme:dark}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 Atlas,'Segoe UI',Arial,sans-serif}button,input,select{font:inherit}button,summary,select{cursor:pointer}button{background:var(--surface);border:1px solid var(--line);color:var(--text);border-radius:8px;padding:9px 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#collapse-zone{font-size:13px;padding:8px 10px;min-height:40px}.sheet-actions{align-items:center}

#close-zone{font-size:14px;padding:8px 12px;min-height:40px}