:root {
  --ink: #1e252e;
  --soft: #5f6b78;
  --line: rgba(30, 37, 46, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 12%, rgba(57, 118, 206, 0.2), transparent 26%),
    radial-gradient(circle at 88% 86%, rgba(232, 109, 85, 0.2), transparent 28%),
    linear-gradient(180deg, #eef2e9, #e4e9de);
}

.shell {
  width: min(980px, calc(100vw - 22px));
  margin: 18px auto;
  display: grid;
  gap: 12px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.9);
}

h1 {
  margin: 0;
}

p {
  color: var(--soft);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.controls {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.controls label {
  display: grid;
  gap: 4px;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--soft);
}

.controls input,
.controls select {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 6px 9px;
  background: #fff;
  color: var(--ink);
}

button {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  padding: 7px 11px;
  font-weight: 700;
  cursor: pointer;
}

.status {
  margin-top: 8px;
  font-family: Consolas, monospace;
}

#arena {
  width: 100%;
  max-width: 640px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fdfdfd;
}

.feed {
  margin: 10px 0 0;
  padding-left: 16px;
  display: grid;
  gap: 7px;
}

.feed li {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--soft);
  padding: 7px;
  font-family: Consolas, monospace;
  font-size: 0.78rem;
}