:root{--background:#ffffff;--foreground:#171717}html.dark{--background:#0a0a0a;--foreground:#ededed}body{font-family:Arial,Helvetica,sans-serif;margin:0;padding:0}.container,body{background:var(--background);color:var(--foreground)}.container{max-width:700px;margin:2rem auto;padding:2rem;border-radius:1rem;box-shadow:0 2px 10px rgba(0,0,0,.1)}h1{text-align:center;font-size:2rem;margin-bottom:1rem}button,select,textarea{font-size:1rem;border-radius:6px;padding:.6rem 1rem;border:1px solid #aaa;background-color:var(--background);color:var(--foreground);transition:background-color .2s ease,color .2s ease,border-color .2s ease}button:hover{cursor:pointer;opacity:.9}textarea{width:100%;resize:none;margin-bottom:1rem}label{display:block;margin:1rem 0 .4rem;font-weight:700}select{width:100%;margin-bottom:1rem}select option{background-color:var(--background);color:var(--foreground)}html.dark select,html.dark select option{background-color:#1f2937;color:#f9fafb;border-color:#4b5563}button:focus,select:focus,textarea:focus{outline:none;border-color:#666}footer{margin-top:2rem;text-align:center;font-size:.8rem;color:var(--foreground)}.toggle-button{display:flex;justify-content:flex-end;margin-bottom:1rem}.output-box{background-color:#f4f4f4;padding:1rem;border-radius:8px;margin-top:1rem;overflow-y:auto;max-height:400px}html.dark .output-box{background-color:#222;color:#eee}