:root {
  --mint-50: #effaf6;
  --mint-100: #d7f2e9;
  --mint-300: #7fe1c9;
  --mint-500: #28c5a5;
  --mint-600: #17a98d;
  --teal-700: #0f7b6a;
  --teal-900: #172f2a;
  --lime-100: #dff2cf;
  --yellow-100: #fff1bd;
  --canvas: #dfecea;
  --surface: #f7fbf9;
  --panel: rgba(255, 255, 255, 0.88);
  --line: #dbe8e3;
  --muted: #728681;
  --text: #213b36;
  --danger: #d94c4c;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --font: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  font-family: var(--font);
  background:
    radial-gradient(circle at 78% 0%, rgba(40, 197, 165, 0.22), transparent 32%),
    radial-gradient(circle at 12% 12%, rgba(223, 242, 207, 0.88), transparent 30%),
    linear-gradient(90deg, rgba(15, 123, 106, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(15, 123, 106, 0.06) 1px, transparent 1px),
    var(--canvas);
  background-size: auto, auto, 34px 34px, 34px 34px, auto;
}

button {
  cursor: pointer;
  font: inherit;
}

h1,
h2,
h3,
p {
  margin: 0;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(420px, 1fr) minmax(300px, 360px);
  gap: 14px;
  width: min(1180px, calc(100% - 32px));
  min-height: calc(100vh - 32px);
  margin: 16px auto;
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.74);
  border-radius: 30px;
  background: rgba(246, 250, 248, 0.84);
  box-shadow: 0 22px 70px rgba(28, 63, 55, 0.09);
  backdrop-filter: blur(18px);
}

.panel {
  border: 1px solid rgba(219, 232, 227, 0.9);
  border-radius: var(--radius-md);
  background: var(--panel);
  backdrop-filter: blur(14px);
}

.game-panel {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  gap: 10px;
  padding: 16px;
}

.hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow {
  color: var(--mint-600);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin-top: 4px;
  font-size: clamp(32px, 4.4vw, 52px);
  line-height: 0.94;
  letter-spacing: 0;
}

h2 {
  margin-top: 2px;
  font-size: 22px;
  line-height: 1.05;
  letter-spacing: 0;
}

h3 {
  font-size: 14px;
  line-height: 1.2;
}

.badge,
.rule-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 28px;
  border-radius: 999px;
  color: var(--teal-700);
  background: var(--mint-100);
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.badge {
  padding: 0 10px;
}

.badge i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint-500);
  box-shadow: 0 0 0 4px rgba(40, 197, 165, 0.14);
}

.board-wrap {
  display: grid;
  place-items: center;
  min-height: 0;
  padding: 10px;
  border: 1px solid rgba(40, 197, 165, 0.25);
  border-radius: var(--radius-md);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.78), rgba(239, 250, 246, 0.7)),
    radial-gradient(circle at 100% 0%, rgba(40, 197, 165, 0.18), transparent 42%);
}

canvas {
  display: block;
  width: min(100%, calc(100vh - 128px));
  max-width: 760px;
  aspect-ratio: 1;
  border: 1px solid rgba(15, 123, 106, 0.18);
  border-radius: var(--radius-sm);
  background: #172f2a;
  box-shadow: 0 18px 46px rgba(28, 63, 55, 0.12);
}

.side-panel {
  display: grid;
  align-content: start;
  gap: 14px;
  padding: 16px;
}

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

.ai-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(145deg, var(--mint-500), var(--teal-700));
  font-size: 12px;
  font-weight: 800;
}

.status {
  min-height: 46px;
  padding: 12px;
  border-radius: var(--radius-sm);
  color: var(--teal-700);
  background: var(--lime-100);
  font-size: 13px;
  font-weight: 800;
}

.status.paused {
  color: #8d6800;
  background: var(--yellow-100);
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.mobile-stats,
.mobile-controls {
  display: none;
}

.metric-card {
  min-height: 96px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
}

.metric-card span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-size: 34px;
  line-height: 1;
}

.actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.mobile-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  width: min(100%, 360px);
  margin: 0 auto;
}

.btn {
  min-height: 42px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0 14px;
  font-weight: 800;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease, transform 160ms ease;
}

.btn:hover,
.dpad button:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: #fff;
  background: var(--mint-500);
}

.btn-primary:hover {
  background: var(--mint-600);
}

.btn-secondary {
  color: var(--teal-700);
  border-color: var(--mint-100);
  background: var(--mint-50);
}

.btn-ghost {
  color: var(--muted);
  border-color: var(--line);
  background: #fff;
}

.control-card {
  display: grid;
  gap: 10px;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.control-card p {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.dpad {
  display: grid;
  grid-template-columns: repeat(3, 54px);
  grid-template-areas:
    ". up ."
    "left down right";
  justify-content: center;
  gap: 8px;
}

.dpad button {
  width: 54px;
  height: 54px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--teal-700);
  background: #fff;
  font-size: 24px;
  font-weight: 800;
}

.dpad [data-dir="up"] {
  grid-area: up;
}

.dpad [data-dir="left"] {
  grid-area: left;
}

.dpad [data-dir="down"] {
  grid-area: down;
}

.dpad [data-dir="right"] {
  grid-area: right;
}

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

.rule-chip {
  padding: 0 9px;
  color: var(--muted);
  border: 1px solid var(--line);
  background: #fff;
}

@media (max-width: 940px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .game-panel {
    grid-template-rows: auto auto auto auto;
    gap: 14px;
    padding: 20px;
  }

  .mobile-stats {
    display: grid;
  }

  .mobile-controls {
    display: grid;
    gap: 10px;
    justify-items: center;
  }

  .mobile-controls > .btn-primary {
    width: min(100%, 360px);
  }

  .side-panel {
    display: none;
  }

  .side-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .panel-title,
  .status,
  .stats,
  .actions,
  .control-card,
  .rules {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .app-shell {
    width: 100%;
    min-height: 100vh;
    margin: 0;
    border-radius: 0;
    padding: 10px;
  }

  .game-panel,
  .side-panel {
    padding: 12px;
  }

  h1 {
    font-size: clamp(38px, 7vw, 76px);
    line-height: 0.9;
  }

  .hero {
    flex-direction: column;
  }

  canvas {
    width: 100%;
  }

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

  .mobile-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .metric-card {
    min-height: 76px;
    padding: 12px;
  }

  .metric-card strong {
    font-size: 28px;
  }

  .board-wrap {
    padding: 8px;
  }

  .dpad {
    grid-template-columns: repeat(3, 62px);
    gap: 9px;
  }

  .dpad button {
    width: 62px;
    height: 58px;
    touch-action: manipulation;
  }
}