*{box-sizing:border-box}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:#0b1220;color:#e8eef9;margin:0;padding:2rem}
.container{max-width:760px;margin:0 auto}
h1{margin-top:0}
.card{background:#111a2b;border:1px solid #1e2a44;border-radius:14px;padding:1rem;margin:1rem 0}
.row{display:flex;gap:1rem;margin:.6rem 0;align-items:center}
.row label{width:200px}
input,select,button{padding:.5rem;border-radius:8px;border:1px solid #2a3a5e;background:#0e1626;color:#e8eef9}
button{cursor:pointer}
.error{background:#3b0d0d;border:1px solid #7c1919;color:#ffd6d6;border-radius:10px;padding:.75rem;margin-bottom:1rem}
.result p{margin:.3rem 0}
.api code, .api pre{display:block;background:#0e1626;border:1px solid #2a3a5e;padding:8px;border-radius:10px;overflow-x:auto}