:root{--bg: #fafafa;--fg: #1a1a1a;--fg-muted: #6b6b6b;--cell-red: #e0263f;--cell-blue: #2456e0;--cell-white: #f4f4f0;--cell-white-border: #c9c9c2;--panel-bg: #ffffff;--overlay-bg: rgba(0, 0, 0, .45);--accent: #1a1a1a;--radius: 0px;--transition-ms: .12s;--font-display: "Poppins", Futura, "Century Gothic", Avenir, "Avenir Next", "Helvetica Neue", Arial, sans-serif}@media (prefers-color-scheme: dark){:root{--bg: #121212;--fg: #f2f2f2;--fg-muted: #a0a0a0;--cell-red: #ef4a5f;--cell-blue: #5b7fff;--cell-white: #2a2a2a;--cell-white-border: #565656;--panel-bg: #1c1c1c;--overlay-bg: rgba(0, 0, 0, .65);--accent: #f2f2f2}}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;-webkit-tap-highlight-color:transparent}body{background:var(--bg);color:var(--fg);font-family:var(--font-display);font-weight:400;-webkit-font-smoothing:antialiased}#app{min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:12px 16px 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