.gtb-center{text-align:center}
.gtb-h1{font-size:clamp(26px,3.6vw,38px);margin:8px 0 6px}
.gtb-subtitle{color:#5f6368;margin:0 0 16px}
.gtb-wrap{border:1px solid #eee;border-radius:14px;padding:14px;margin:16px 0;background:#fff}
.gtb-ui{max-width:900px;margin:0 auto}
.gtb-input{width:100%;min-height:200px;padding:12px;border:1px solid #ddd;border-radius:10px;font:16px/1.5 system-ui,Arial}
.gtb-bar{display:flex;gap:10px;align-items:center;justify-content:center;margin:10px 0}
.gtb-btn{background:#0b57d0;color:#fff;border:1px solid #0b57d0;border-radius:10px;padding:10px 14px;cursor:pointer;box-shadow:0 2px 8px rgba(11,87,208,.18)}
.gtb-btn.gtb-clear{background:#f5f5f5;color:#333;border-color:#ddd}
.gtb-count{color:#666}
.gtb-out{max-width:900px;margin:8px auto;border:1px solid #eee;border-radius:10px;padding:10px;background:#fafafa;white-space:normal}
.gtb-pre{white-space:pre-wrap;word-wrap:break-word;margin:0}
@media (max-width:560px){.gtb-bar{flex-wrap:wrap}}