:root{--ink:#191d1b;--muted:#68716d;--line:#d9dfd8;--paper:#f4f1e8;--panel:#fffefa;--accent:#0f766e;--accent-dark:#0a4f4a;--shadow:0 20px 55px #2026221f}*{box-sizing:border-box}html{background:var(--paper);color:var(--ink)}body{letter-spacing:0;margin:0;font-family:Arial,Helvetica,sans-serif}button,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.page-shell{place-items:center;min-height:100vh;padding:24px;display:grid}.tool{width:min(820px,100%)}h1{margin:0 0 16px;font-size:38px;line-height:1.08}.composer{grid-template-columns:minmax(0,1fr) 118px;gap:10px;display:grid}textarea{border:1px solid var(--line);background:var(--panel);width:100%;color:var(--ink);box-shadow:var(--shadow);resize:vertical;padding:16px;line-height:1.5}.composer textarea{min-height:170px}textarea::placeholder{color:var(--muted)}.send-button{border:1px solid var(--accent);background:var(--accent);color:#fff;min-height:52px;box-shadow:var(--shadow);justify-content:center;align-self:stretch;align-items:center;gap:8px;padding:0 16px;font-weight:800;display:inline-flex}.send-button:hover:not(:disabled){background:var(--accent-dark)}.result-box{white-space:pre-wrap;min-height:240px;margin-top:12px}.info-page{border:1px solid var(--line);background:var(--panel);max-width:760px;box-shadow:var(--shadow);margin:42px auto;padding:26px}.info-page h1{margin:18px 0 12px}.info-page p{color:var(--muted);font-size:17px;line-height:1.65}.back-link{color:var(--accent-dark);font-weight:800;text-decoration:none}@media (max-width:640px){.page-shell{place-items:start center;padding:18px 12px}h1{font-size:30px}.composer{grid-template-columns:1fr}.composer textarea{min-height:220px}.send-button{width:100%}}