:root {
  --bg-a: #e6f4ff;
  --bg-b: #f7fbff;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --accent: #0ea5e9;
  --chip: #f8fafc;
  --chip-border: #cbd5e1;
  --chip-active-bg: #0ea5e9;
  --chip-active-text: #ffffff;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.16);
  --soft-shadow: 0 10px 24px rgba(14, 165, 233, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "SF Pro Text", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, var(--bg-b), var(--bg-a));
  min-height: 100vh;
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}

.game-shell {
  width: min(100%, 560px);
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.top-bar h1 {
  margin: 0;
  font-size: clamp(1.2rem, 2.5vw, 1.55rem);
}

.sub {
  margin: 6px 0 14px;
  color: var(--muted);
  font-size: 0.95rem;
}

.canvas-wrap {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.08);
}

canvas {
  width: 100%;
  height: auto;
  display: block;
  outline: none;
}

canvas:focus-visible {
  box-shadow: inset 0 0 0 3px rgba(14, 165, 233, 0.8);
}

.overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.88));
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 10px;
  text-align: center;
  padding: 24px;
  backdrop-filter: blur(2px);
}

.overlay h2 {
  margin: 0;
  font-size: 1.6rem;
}

.overlay p {
  margin: 0;
  color: var(--muted);
}

.customize {
  width: min(100%, 420px);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(203, 213, 225, 0.8);
  border-radius: 12px;
  padding: 10px;
  display: grid;
  gap: 10px;
  text-align: left;
}

.custom-row {
  display: grid;
  gap: 6px;
}

.custom-row.split {
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.custom-label {
  margin: 0;
  font-size: 0.85rem;
  color: #334155;
  font-weight: 600;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  border: 1px solid var(--chip-border);
  border-radius: 999px;
  background: var(--chip);
  color: #1e293b;
  font: inherit;
  font-size: 0.86rem;
  padding: 7px 12px;
  cursor: pointer;
  transition: transform 120ms ease, background-color 120ms ease, color 120ms ease;
}

.chip:hover,
.chip:focus-visible {
  transform: translateY(-1px);
}

.chip.active,
.chip[aria-pressed="true"] {
  background: var(--chip-active-bg);
  color: var(--chip-active-text);
  border-color: var(--chip-active-bg);
}

.hidden {
  display: none;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 10px 20px;
  font: inherit;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  box-shadow: var(--soft-shadow);
  cursor: pointer;
  transition: transform 130ms ease, filter 130ms ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  filter: brightness(1.04);
}

.btn:active {
  transform: translateY(0);
}

.hud {
  position: absolute;
  top: 10px;
  left: 12px;
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.84);
  color: var(--text);
  box-shadow: 0 6px 14px rgba(15, 23, 42, 0.1);
}

.hud p {
  margin: 0;
  font-weight: 600;
  line-height: 1.45;
}

kbd {
  background: #f1f5f9;
  border-radius: 5px;
  border: 1px solid #cbd5e1;
  padding: 1px 4px;
  font-size: 0.85em;
}

@media (max-width: 560px) {
  .game-shell {
    padding: 12px;
    border-radius: 12px;
  }

  .overlay {
    padding: 14px;
    align-content: start;
    overflow-y: auto;
  }

  .custom-row.split {
    grid-template-columns: 1fr;
  }
}