:root {
  --bg: #08111d;
  --panel: rgba(10, 19, 34, 0.92);
  --panel-border: rgba(141, 170, 215, 0.16);
  --text: #eef4ff;
  --muted: #9fb3d8;
  --accent: #63b3ff;
  --felt-1: #0d66ba;
  --felt-2: #0a4f95;
  --felt-3: #083e74;
  --gold: #d7b16a;
  --shadow: rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  background:
    radial-gradient(circle at top, rgba(26, 55, 97, 0.55), transparent 36%),
    linear-gradient(180deg, #0a1324 0%, #07101c 100%);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

button,
select {
  font: inherit;
}

body {
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--panel-border);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.28);
}

.left {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.title {
  font-weight: 800;
  letter-spacing: 0.02em;
  font-size: 1.05rem;
}

.status {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 2px;
  line-height: 1.35;
}

.right {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

select,
button {
  background: rgba(15, 28, 49, 0.96);
  color: var(--text);
  border: 1px solid rgba(152, 180, 224, 0.18);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

select:focus,
button:focus {
  border-color: rgba(108, 179, 255, 0.6);
  box-shadow:
    0 0 0 3px rgba(99, 179, 255, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

button {
  cursor: pointer;
  font-weight: 700;
  background:
    linear-gradient(180deg, rgba(31, 84, 153, 0.95), rgba(19, 55, 105, 0.95));
}

button:hover {
  filter: brightness(1.06);
}

.wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 12px 20px;
  gap: 12px;
  width: 100%;
}

canvas {
  width: min(96vw, 1040px);
  height: calc(min(96vw, 1040px) * 0.55);
  max-height: 72vh;
  border-radius: 24px;
  touch-action: none;
  display: block;
  box-shadow:
    0 28px 60px rgba(0, 0, 0, 0.42),
    0 12px 26px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  background:
    radial-gradient(circle at 50% 45%, rgba(110, 190, 255, 0.08), transparent 44%),
    linear-gradient(180deg, #09376a 0%, #082f59 100%);
}

.hud {
  width: min(96vw, 1040px);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.hud-item {
  min-height: 52px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(13, 24, 44, 0.94), rgba(9, 17, 33, 0.9));
  border: 1px solid rgba(144, 173, 219, 0.2);
  color: var(--muted);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.05),
    inset 0 -1px 0 rgba(255, 255, 255, 0.03),
    0 10px 24px rgba(0, 0, 0, 0.2);
}

.hud-item b,
.hud-item #turn,
.hud-item #bih {
  color: var(--text);
}

.group-display {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  min-height: 28px;
  border-radius: 999px;
  padding: 2px 4px;
  background: rgba(7, 13, 24, 0.34);
}

.group-empty {
  color: var(--muted);
}

.group-ball {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  position: relative;
  display: inline-block;
  box-shadow:
    inset -3px -4px 8px rgba(0, 0, 0, 0.22),
    inset 2px 3px 5px rgba(255, 255, 255, 0.2),
    0 3px 8px rgba(0, 0, 0, 0.32);
}

.group-ball::before {
  content: "";
  position: absolute;
  top: 3px;
  left: 4px;
  width: 9px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.65);
  transform: rotate(-28deg);
  filter: blur(0.4px);
}

.group-ball::after {
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: #ffffff;
  color: #0e1420;
  font-size: 10px;
  font-weight: 800;
  display: grid;
  place-items: center;
  content: attr(data-num);
}

.group-ball.solid-1 {
  background:
    radial-gradient(circle at 30% 28%, rgba(255, 255, 255, 0.35), transparent 26%),
    linear-gradient(145deg, #ffe26f 0%, #f2c700 58%, #c49d00 100%);
}

.group-ball.stripe-9 {
  background:
    radial-gradient(circle at 30% 28%, rgba(255, 255, 255, 0.28), transparent 24%),
    linear-gradient(180deg, #f0b800 0 28%, #ffffff 28% 72%, #d8a300 72% 100%);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 920px) {
  .hud {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .right {
    width: 100%;
    justify-content: stretch;
  }

  .right select,
  .right button {
    flex: 1 1 140px;
  }

  canvas {
    width: min(98vw, 1040px);
    height: calc(min(98vw, 1040px) * 0.6);
  }
}

@media (max-width: 560px) {
  .wrap {
    padding-left: 8px;
    padding-right: 8px;
  }

  .hud {
    grid-template-columns: 1fr;
  }

  .hud-item {
    min-height: 48px;
    padding: 11px 12px;
    font-size: 0.95rem;
  }

  .status {
    font-size: 0.74rem;
  }
}