:root{--bg:#f7f7f7;--canvas-bg:#fff;--sidebar-bg:#fff;--button-bg:#fff;--button-bg-hover:#f3f4f6;--border:#475569;--text:#000;--muted-text:#6b7280;--sidebar-padding:.5rem;--sidebar-scrollbar-gutter:1rem;--keypad-gap:.125rem;--keypad-button-size:3rem;--sidebar-width:calc((var(--keypad-button-size) * 4) + (var(--keypad-gap) * 3) + (var(--sidebar-padding) * 2) + var(--sidebar-scrollbar-gutter))}*{box-sizing:border-box}html,body{width:100%;height:100%;margin:0;overflow:hidden}body{color:var(--text);background:var(--bg);font-family:Computer Modern,serif}.mathgrid-container{width:100vw;height:100vh;margin:0;padding:0;display:flex}.sidebar{z-index:2;flex:0 0 var(--sidebar-width);height:100vh;padding:var(--sidebar-padding);scrollbar-gutter:stable;background:var(--sidebar-bg);border-right:1px solid var(--border);position:relative;overflow-y:auto}.sidebar h1{margin:0;padding:0 0 .5rem;font-size:1rem}.sidebar-section{border-top:1px solid var(--border);padding:1.5rem 0}.sidebar-section h2{color:var(--muted-text);letter-spacing:.04em;text-align:center;text-transform:uppercase;margin:0 0 .5rem;padding:0;font-size:1.2rem;font-weight:700}.sidebar-section.navigation-pad{flex-direction:column;justify-content:center;align-items:center;display:flex}.sidebar-section.navigation-pad>.sidebar-navigation-pad{background:var(--button-bg-hover);width:9rem;height:9rem;box-shadow:inset 0 0 0 1px var(--border);border-radius:50%;grid-template-rows:repeat(3,3rem);grid-template-columns:repeat(3,3rem);grid-template-areas:".up.""left center right"".down.";place-items:center;display:grid}.sidebar-button.navigation{width:2.5rem;height:2.5rem;color:var(--text);font:inherit;cursor:pointer;background:0 0;border:0;border-radius:50%;font-size:1.5rem}.sidebar-button.navigation:hover{background:var(--button-bg)}.navigation-up{grid-area:up}.navigation-left{grid-area:left}.navigation-center{grid-area:center}.navigation-right{grid-area:right}.navigation-down{grid-area:down}.sidebar-button-grid{grid-template-columns:repeat(4, var(--keypad-button-size));gap:var(--keypad-gap);display:grid}.sidebar-button-grid .sidebar-button,.sidebar-button-grid .sidebar-double-button{width:var(--keypad-button-size);height:var(--keypad-button-size);border:1px solid var(--border);color:var(--text);background:var(--button-bg);font:inherit;cursor:pointer;border-radius:2px;font-size:1.25rem}.sidebar-button-grid .sidebar-button:hover,.sidebar-button-grid .sidebar-double-button:hover{background:var(--button-bg-hover)}.sidebar-button-grid .sidebar-double-button{grid-column:span 2;width:auto}.palette-button,.double-palette-button{width:var(--keypad-button-size);height:var(--keypad-button-size);position:relative}.sidebar-button-grid .double-palette-button{grid-column:span 2;width:auto}.sidebar-button-grid .palette-main{width:100%;height:100%}.sidebar-button-grid .palette-trigger{border:1px solid var(--border);background:var(--button-bg);width:1rem;height:1rem;padding:0;font-size:.625rem;line-height:1;position:absolute;bottom:0;right:0}.palette-menu{z-index:20;top:var(--palette-menu-top,0);left:var(--palette-menu-left,0);grid-template-columns:repeat(var(--palette-column-count,3), var(--keypad-button-size));gap:var(--keypad-gap);padding:var(--keypad-gap);background:var(--sidebar-bg);border:1px solid var(--border);display:none;position:fixed}.palette-button.is-open .palette-menu,.double-palette-button.is-open .palette-menu{display:grid}.canvas{z-index:1;background:var(--canvas-bg);flex:auto;min-width:0;height:100vh;position:relative}#mathgrid{width:100%;height:100%;display:block}