:root{--max-width:1100px;--border-radius:12px;--font-mono:ui-monospace,Menlo,Monaco,"Cascadia Mono","Segoe UI Mono","Roboto Mono","Oxygen Mono","Ubuntu Monospace","Source Code Pro","Fira Mono","Droid Sans Mono","Courier New",monospace;--foreground-rgb:255,255,255;--background-start-rgb:20,20,30;--background-end-rgb:10,10,20;--primary-glow:radial-gradient(rgba(1,65,255,.4),rgba(1,65,255,0));--secondary-glow:linear-gradient(to bottom right,rgba(1,65,255,0),rgba(1,65,255,0),rgba(1,65,255,.3));--tile-start-rgb:2,13,46;--tile-end-rgb:2,5,19;--tile-border:conic-gradient(#ffffff80,#ffffff40,#ffffff30,#ffffff20,#ffffff10,#ffffff10,#ffffff80);--callout-rgb:40,40,50;--callout-border-rgb:108,108,128;--card-rgb:60,60,80;--card-border-rgb:150,150,180;--sudoku-border:#555;--sudoku-text:#fff;--sudoku-input-bg:#2a2a3a;--sudoku-input-focus:rgba(100,100,150,.5);--sudoku-active-cell:#4caf50;--sudoku-pencil-text:#aaa;--label-text:#bbb;--rank-gold:gold;--rank-silver:silver;--rank-bronze:#cd7f32}*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden}body{color:rgb(var(--foreground-rgb));background:linear-gradient(to bottom,transparent,rgb(var(--background-end-rgb))) rgb(var(--background-start-rgb))}a{color:inherit;text-decoration:none}@media (prefers-color-scheme:dark){html{color-scheme:dark}}.btn{outline:none;-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;background-color:#6a4bcc;border-radius:6px;color:#fff;padding:12px 24px;cursor:pointer;display:inline-block;margin:8px 5px;font-weight:600;font-size:14px;transition:background-color .2s ease}.btn:hover{background-color:#7d58dd}h1,h2,h3,h4,h5,h6{color:var(--sudoku-text)}.sudoku{padding:0 15px;height:100vh}.wrapper{display:flex;align-items:center;justify-content:center;height:100%;width:100%}