:root{--bg:#0f1724;--card:#0b1220;--accent:#7dd3fc;--text:#e6eef8}
*{box-sizing:border-box;font-family:Inter,system-ui,Segoe UI,Arial}
body{margin:20px;background:linear-gradient(180deg,#071025 0%, #071522 100%);color:var(--text)}
.card{max-width:800px;margin:0 auto;padding:20px;background:var(--card);border-radius:10px;box-shadow:0 6px 24px rgba(2,6,23,.6)}
h1{margin:0 0 12px;font-size:20px;color:var(--accent)}
label{display:block;margin:12px 0 6px;font-size:13px;opacity:.9}
textarea{width:100%;min-height:100px;padding:10px;border-radius:6px;border:1px solid rgba(125,211,252,.08);background:#021221;color:var(--text);resize:vertical}
.row{display:flex;gap:12px}
.row > div{flex:1}
input[type=number], select{width:100%;padding:8px;border-radius:6px;border:1px solid rgba(125,211,252,.08);background:#021221;color:var(--text)}
.buttons{display:flex;gap:8px;margin-top:12px}
button{flex:1;padding:10px;border-radius:8px;border:0;background:linear-gradient(90deg,var(--accent),#60a5fa);color:#002033;font-weight:600;cursor:pointer}
button:active{transform:translateY(1px)}
#copy{flex:0 0 120px;background:transparent;border:1px solid rgba(125,211,252,.12);color:var(--text)}