:root{
  --bg:#0b1220;
  --panel:#121b2f;
  --text:#e8eefc;
  --muted:#b7c3e6;
  --border:rgba(255,255,255,0.12);
  --btn:#4ea1ff;
  --btn2:#7cf0c8;
  --danger:#ff5b5b;
}

*{box-sizing:border-box}

body{
  margin:0;
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  background: radial-gradient(1200px 600px at 15% 10%, rgba(78,161,255,0.25), transparent 55%),
              radial-gradient(900px 500px at 85% 20%, rgba(124,240,200,0.18), transparent 60%),
              var(--bg);
  color:var(--text);
}

.container{
  max-width:980px;
  margin:0 auto;
  padding:0 16px;
}

.topbar{
  position:sticky;
  top:0;
  border-bottom:1px solid var(--border);
  background: rgba(11,18,32,0.80);
  backdrop-filter: blur(10px);
}

.topbar .container{
  padding:14px 16px;
}

.brand{
  font-weight:800;
  letter-spacing:0.6px;
  font-size:14px;
}

.sub{
  color:var(--muted);
  font-size:12px;
  margin-top:2px;
}

.hero{
  margin:18px 0 14px;
  padding:16px;
  border:1px solid var(--border);
  border-radius:16px;
  background: rgba(18,27,47,0.60);
}

.hero h1{
  margin:0 0 8px;
  font-size:22px;
}

.hero p{
  margin:0 0 10px;
  color:var(--muted);
  line-height:1.45;
}

.hint{
  color:var(--muted);
  font-size:12.5px;
  line-height:1.4;
}

.card{
  margin:12px 0;
  padding:14px;
  border:1px solid var(--border);
  border-radius:16px;
  background: rgba(18,27,47,0.55);
}

.cardhead{
  display:flex;
  gap:12px;
  align-items:center;
  justify-content:space-between;
  margin-bottom:10px;
}

.cardhead h2{
  margin:0;
  font-size:14px;
  line-height:1.25;
}

.copybtn{
  border:1px solid var(--border);
  background: linear-gradient(90deg, var(--btn), var(--btn2));
  color:#06101f;
  padding:8px 10px;
  border-radius:12px;
  font-weight:750;
  cursor:pointer;
  min-width:92px;
}

.copybtn:active{ transform: translateY(1px); }

.copybtn.ok{
  background: rgba(124,240,200,0.20);
  color: var(--text);
}

.copybtn.err{
  background: rgba(255,91,91,0.18);
  color: var(--text);
}

.block{
  margin:0;
  white-space:pre-wrap;
  word-break:break-word;
  background: rgba(0,0,0,0.28);
  border:1px solid rgba(255,255,255,0.10);
  border-radius:12px;
  padding:12px;
  overflow:auto;
  line-height:1.35;
  color:var(--text);
}

.footer{
  border-top:1px solid var(--border);
  margin-top:22px;
  padding:16px 0;
  color:var(--muted);
  font-size:12px;
}