:root{
  --bg:#0b1020;
  --card:#121933;
  --muted:#9fb3ff;
  --text:#e8ecff;
  --accent:#6aa9ff;
  --warn:#ff6b6b;
  --ok:#2ecc71;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--text)}
.wrapper{max-width:1100px;margin:0 auto;padding:32px}
.header{display:flex;align-items:center;gap:12px;font-weight:700}
.header img{width:28px;height:28px}
h1{margin:8px 0 18px 0;font-size:28px}
.grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
@media(max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}}
.card{background:var(--card);border:1px solid #1e274c;border-radius:14px;padding:18px;box-shadow:0 4px 24px rgba(0,0,0,.3)}
.card h3{margin:0 0 6px 0}
.sub{color:var(--muted);font-size:14px}
.btn{background:var(--accent);color:#04102b;border:none;padding:10px 16px;border-radius:10px;font-weight:700;cursor:pointer}
.btn:disabled{opacity:.6;cursor:not-allowed}
.row{display:flex;gap:12px;flex-wrap:wrap}
.input,select{width:100%;padding:10px;border-radius:10px;border:1px solid #2a3563;background:#0f1733;color:var(--text)}
label{font-size:13px;color:var(--muted)}
.section{margin-top:22px}
.badge{display:inline-block;border-radius:999px;padding:4px 10px;background:#0f1733;border:1px solid #263166;color:var(--muted);font-size:12px}
.output{white-space:pre-wrap;background:#0f1733;border:1px dashed #2a3563;padding:12px;border-radius:10px;min-height:44px}
.error{color:var(--warn)}
.success{color:var(--ok)}
.center{display:flex;align-items:center;justify-content:center;height:70vh;flex-direction:column;gap:16px}
a{color:var(--accent)}
.footer{margin-top:40px;color:var(--muted);font-size:12px;text-align:center}