:root{
  --bg1: #1f2041;
  --bg2: #262857;
  --glass-bg: rgba(255,255,255,0.06);
  --accent: linear-gradient(90deg,#8b5cf6,#06b6d4);
  --card-shadow: 0 8px 30px rgba(2,6,23,0.6);
  --radius: 14px;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color-scheme: dark;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background: radial-gradient(1200px 600px at 10% 10%, rgba(99,102,241,0.12), transparent),
              radial-gradient(1000px 500px at 90% 80%, rgba(34,211,238,0.06), transparent),
              linear-gradient(180deg,var(--bg1),var(--bg2));
  display:flex;
  align-items:center;
  justify-content:center;
  padding:28px;
  color:#e6eef8;
}

.container{width:100%;max-width:980px}

header{margin-bottom:16px;text-align:center}
h1{margin:0 0 6px 0;font-size:20px}
.muted{color:rgba(230,238,248,0.6);font-size:13px}

/* card / glass */
.card{
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));
  border-radius:var(--radius);
  padding:20px;
  box-shadow:var(--card-shadow);
  backdrop-filter: blur(8px) saturate(120%);
  border: 1px solid rgba(255,255,255,0.04);
}

/* form */
form{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;align-items:start}
label{display:flex;flex-direction:column;font-size:13px;color:rgba(230,238,248,0.9)}
input,select{margin-top:8px;padding:10px 12px;border-radius:10px;border:1px solid rgba(255,255,255,0.04);background:transparent;color:inherit;outline:none}
input[type="number"]{width:100%}

/* buttons */
.actions{grid-column:1/-1;display:flex;gap:12px;justify-content:flex-start;margin-top:4px}
.btn{padding:10px 14px;border-radius:999px;border:none;cursor:pointer;background:rgba(255,255,255,0.03);color:inherit;font-weight:600;box-shadow:0 6px 18px rgba(2,6,23,0.45)}
.btn.primary{
  background: linear-gradient(90deg,#7c3aed,#06b6d4);
  color:white;
  box-shadow: 0 10px 30px rgba(8,8,20,0.6);
}

/* output */
.output{margin-top:18px}
.result{
  width:100%;
  max-height:320px;
  overflow:auto;
  background:rgba(0,0,0,0.35);
  padding:12px;border-radius:10px;font-size:13px;line-height:1.45;
  white-space:pre-wrap;
  word-break:break-all;
}

/* responsive */
@media (max-width:640px){
  form{grid-template-columns:1fr}
}