:root{--bg:#0b1020;--card:#121a2b;--text:#e5e7eb;--muted:#94a3b8;--accent:#60a5fa;--danger:#f87171}
*{box-sizing:border-box;font-family:Inter,system-ui,Segoe UI,Roboto,sans-serif}
body{margin:0;background:radial-gradient(1000px 500px at 10% -10%,#1e293b 0%,#0b1020 55%);color:var(--text)}
.app{max-width:1100px;margin:0 auto;padding:24px}
header h1{margin:0 0 6px;font-size:2rem}
.banner-btn{all:unset;cursor:pointer;font-size:2rem;font-weight:700;color:var(--text)}
.banner-btn:hover{color:var(--accent)}
header p{margin:0 0 18px;color:var(--muted)}
.card{background:rgba(18,26,43,.9);border:1px solid #1f2a44;border-radius:12px;padding:14px}
.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
button{background:#1b2942;color:var(--text);border:1px solid #2e446f;border-radius:10px;padding:8px 12px;cursor:pointer}
button:hover{background:#23365a}
label{color:var(--muted);font-size:14px;display:flex;align-items:center;gap:6px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
textarea{width:100%;min-height:380px;background:#0d1424;color:#e2e8f0;border:1px solid #263553;border-radius:10px;padding:12px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.preset-actions{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.preset-actions button{font-size:13px;padding:7px 10px}
.output-actions{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.output{min-height:380px;background:#0d1424;border:1px solid #263553;border-radius:10px;padding:14px;overflow:auto}
.error{color:var(--danger);min-height:22px}
footer{margin-top:12px;color:var(--muted)}
@media (max-width:900px){.grid{grid-template-columns:1fr}}