:root{
  --bg:#0b0f14;
  --card:#121826;
  --text:#e8eef6;
  --muted:#a9b4c4;
  --border:#253043;
  --primary:#4f7cff;
  --success:#2fbf71;
  --danger:#ff5c5c;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 600px at 20% 0%, #14203a 0%, var(--bg) 60%);
  color:var(--text);
}

.container{
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 16px 40px;
}

.header h1{margin:0 0 6px;font-weight:800;letter-spacing:.2px}
.subtitle{margin:0;color:var(--muted)}

.card{
  margin-top: 18px;
  padding: 18px;
  background: rgba(18,24,38,.9);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 8px 24px rgba(0,0,0,.25);
}

.card h2{margin:0 0 10px;font-size: 18px}

.label{
  display:block;
  margin: 10px 0 6px;
  color: var(--muted);
  font-size: 13px;
}

input, textarea, select{
  width:100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0f1421;
  color: var(--text);
  outline: none;
}
textarea{resize: vertical; min-height: 84px;}
input:focus, textarea:focus, select:focus{border-color:#3b5bb8}

.row{display:flex; gap: 12px; align-items:flex-end; flex-wrap: wrap;}
.col{flex:1; min-width: 240px;}
.actions{display:flex; gap: 10px; flex-wrap: wrap; justify-content:flex-start;}

.btn{
  border: 1px solid var(--border);
  background: #0f1421;
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  transition: transform .02s ease, background .2s ease, border-color .2s ease;
}
.btn:hover{border-color:#3b5bb8}
.btn:active{transform: translateY(1px)}
.btn.primary{background: rgba(79,124,255,.14); border-color: rgba(79,124,255,.4)}
.btn.success{background: rgba(47,191,113,.14); border-color: rgba(47,191,113,.4)}
.btn.danger{background: rgba(255,92,92,.14); border-color: rgba(255,92,92,.4)}
.btn:disabled{opacity:.6; cursor:not-allowed}

.separator{
  margin: 14px 0;
  color: var(--muted);
  text-align:center;
}

.hint{
  color: var(--muted);
  margin: 6px 0 0;
  font-size: 13px;
}
.hint code{
  padding: 2px 6px;
  border-radius: 8px;
  background: #0f1421;
  border: 1px solid var(--border);
}

.msg{
  margin-top: 12px;
  min-height: 18px;
  color: var(--muted);
  font-size: 13px;
}
.msg.ok{color: var(--success)}
.msg.err{color: var(--danger)}

.output{
  margin-top: 12px;
  padding: 12px;
  background: #0a0f1a;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow:auto;
  max-height: 420px;
}

.footer{
  margin-top: 18px;
  color: var(--muted);
  font-size: 12px;
  text-align:center;
}