*{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#fff;--color-text:#000;--color-muted:#888;--color-border:#ddd;--color-success:#0f0;--color-error:red}body{color:var(--color-text);background-color:var(--color-bg);min-height:100vh;font-family:SF Mono,Monaco,Inconsolata,Roboto Mono,monospace;font-size:14px;line-height:1.5}button{font-family:inherit;font-size:inherit;cursor:pointer;border:1px solid var(--color-text);background:var(--color-bg);color:var(--color-text);padding:8px 16px}button:hover{background:var(--color-text);color:var(--color-bg)}button:disabled{opacity:.5;cursor:not-allowed}input{font-family:inherit;font-size:inherit;border:1px solid var(--color-border);outline:none;padding:8px 12px}input:focus{border-color:var(--color-text)}