:root{font-family:Inter,system-ui,-apple-system,sans-serif;--color-bg: #ffffff;--color-text: #1a1a2e;--color-primary: #6366f1;--color-primary-hover: #4f46e5}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--color-bg);color:var(--color-text);min-height:100vh}h1{font-size:2.5rem;margin-bottom:.5rem}button{background:var(--color-primary);color:#fff;border:none;padding:.5rem 1rem;border-radius:.375rem;cursor:pointer;font-size:1rem}button:hover{background:var(--color-primary-hover)}