body{font-family:Arial,sans-serif;background-color:#f4f4f9;padding:20px;color:#333}.app-container{max-width:450px;margin:0 auto;background:#fff;padding:30px;border-radius:8px;border:1px solid #ddd;box-shadow:0 4px 8px #0000000d}.yeller-section{background-color:#f1f5f9;padding:15px;border-radius:6px;border:1px solid #cbd5e1;margin-bottom:25px}.yeller-input{width:100%;padding:8px;font-size:1rem;border:1px solid #94a3b8;border-radius:4px;box-sizing:border-box;margin-top:5px}.yeller-output{font-family:monospace;font-size:1.2rem;color:#dc2626;word-break:break-all;margin-top:10px}.counter-box{border:1px solid #e2e8f0;padding:15px;margin:15px 0;border-radius:6px;background-color:#fafafa}.counter-btn{padding:6px 12px;font-size:.9rem;cursor:pointer;border:1px solid #cbd5e1;background-color:#fff;border-radius:4px}.counter-btn:hover{background-color:#f8fafc}