:root {
  --bg: #0b0f14;
  --panel: #111826;
  --panel-2: #0f1622;
  --border: #1f2b3a;
  --text: #e8eef7;
  --muted: #9fb0c3;
  --accent: #5eead4;
  --danger: #ffb4b4;
  --ok: #86efac;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(1200px 600px at top, #0f172a, #020617);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

.wrap {
  max-width: 860px;
  margin: 32px auto;
  padding: 0 16px;
}

h1 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  font-size: 32px;
}

.grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 16px;
}

@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr; }
}

.card {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 20px 40px rgba(0,0,0,.35);
}

.card h2 {
  margin: 0 0 12px;
  font-size: 20px;
}

.row {
  display: flex;
  gap: 10px;
  align-items: center;
}

input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #020617;
  color: var(--text);
  font-size: 14px;
}

button {
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, #1e293b, #020617);
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  transition: transform .05s ease, background .2s ease;
}

button:hover { transform: translateY(-1px); }
button:disabled { opacity: .4; cursor: not-allowed; }

.hint {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
}

.player {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  margin-bottom: 8px;
  border-radius: 14px;
  background: #020617;
  border: 1px solid var(--border);
}

.player b {
  font-size: 15px;
}

.player span {
  font-size: 13px;
  color: var(--muted);
}

#status {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 12px;
}

.msg {
  margin-top: 10px;
  font-size: 13px;
}
.msg.err { color: var(--danger); }
.msg.ok  { color: var(--ok); }

pre {
  white-space: pre-wrap;
  background: #020617;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  font-size: 14px;
}

.foot {
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}