:root {
  color-scheme: dark;
  --bg: #06131f;
  --bg-soft: #0d2031;
  --card: rgba(13, 27, 40, 0.85);
  --card-border: rgba(138, 197, 255, 0.16);
  --text: #ecf5ff;
  --muted: #95b6d4;
  --accent: #61dafb;
  --accent-2: #ff7a59;
  --ok: #93ffab;
  --danger: #ff6b7b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background:
    radial-gradient(circle at top, rgba(56, 127, 196, 0.18), transparent 35%),
    linear-gradient(180deg, #04101a, var(--bg));
  color: var(--text);
  min-height: 100vh;
}

.shell {
  width: min(1280px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 20px 0 32px;
  display: grid;
  gap: 18px;
  grid-template-columns: 320px 1fr;
  grid-template-areas:
    "intro arena"
    "controls arena";
}

.panel {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  backdrop-filter: blur(12px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.28);
}

.intro {
  grid-area: intro;
  padding: 24px;
}

.controls {
  grid-area: controls;
  padding: 20px;
  display: grid;
  gap: 16px;
}

.arena-panel {
  grid-area: arena;
  padding: 18px;
}

.eyebrow,
.label,
.hint,
.status,
.rules,
label {
  color: var(--muted);
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
p,
ul {
  margin: 0;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  line-height: 0.95;
  margin-bottom: 14px;
}

h2 {
  font-size: 1rem;
  margin-bottom: 14px;
}

.lede {
  line-height: 1.6;
}

.rules {
  padding-left: 18px;
  margin-top: 18px;
  display: grid;
  gap: 8px;
}

.card {
  padding: 18px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 18px;
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 0.92rem;
}

input,
button {
  font: inherit;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

input {
  width: 100%;
  padding: 12px 14px;
  background: rgba(7, 18, 29, 0.92);
  color: var(--text);
}

button {
  padding: 12px 16px;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent), #5c8dff);
  color: #062334;
  font-weight: 700;
}

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.join-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
}

.join-row input {
  min-width: 0;
}

#add-bot,
#remove-bot {
  background: linear-gradient(135deg, #ffd166, var(--accent-2));
}

.lobby-list {
  display: grid;
  gap: 8px;
}

.lobby-row {
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
}

.lobby-row.self {
  color: var(--text);
  border: 1px solid rgba(97, 218, 251, 0.35);
}

.status {
  min-height: 44px;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
}

.hud {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.hud div {
  min-width: 0;
}

.label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: 4px;
}

#arena {
  width: 100%;
  aspect-ratio: 1;
  display: block;
  border-radius: 22px;
  background:
    radial-gradient(circle at center, rgba(97, 218, 251, 0.08), transparent 50%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
}

.hint {
  margin-top: 12px;
  font-size: 0.92rem;
}

@media (max-width: 980px) {
  .shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "intro"
      "controls"
      "arena";
  }
}