:root {
  --page-bg: #ffffff;
  --text-color: #1a1a1a;
  --shell-bg: #ffffff;
  --shell-border: #e5e7eb;
  --button-bg: #f2f4f8;
  --button-border: #d2d7df;
  --button-text: #0f172a;
  --button-hover: #e8edf7;
  --primary-bg: #0d9488;
  --primary-text: #ffffff;
  --overlay-backdrop: rgba(15, 23, 42, 0.22);
  --card-bg: #ffffff;
  --card-text: #0f172a;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--page-bg);
  color: var(--text-color);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  user-select: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

body.theme-dark {
  --page-bg: #0b1220;
  --text-color: #e2e8f0;
  --shell-bg: #0f172a;
  --shell-border: #334155;
  --button-bg: #1e293b;
  --button-border: #3d4a5f;
  --button-text: #edf2ff;
  --button-hover: #2c3a53;
  --primary-bg: #0f766e;
  --primary-text: #f1f5f9;
  --overlay-backdrop: rgba(0, 0, 0, 0.4);
  --card-bg: #111827;
  --card-text: #f8fafc;
}

.app-wrap {
  min-height: 9vh;
  padding: 0;
}

.top-controls {
  position: fixed;
  top: 8px;
  right: 8px;
  z-index: 50;
  display: flex;
  gap: 8px;
}

.control-btn,
.primary-btn {
  border: 1px solid var(--button-border);
  background: var(--button-bg);
  color: var(--button-text);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.control-btn:hover,
.primary-btn:hover {
  background: var(--button-hover);
}

.primary-btn {
  border: 1px solid transparent;
  background: var(--primary-bg);
  color: var(--primary-text);
}

.game-shell {
  max-width: 900px;
  margin: 44px auto 0;
  padding: 0;
  border-radius: 14px;
  background: var(--shell-bg);
  border: 1px solid var(--shell-border);
  box-shadow: 0 10px 28px rgba(20, 23, 29, 0.12);
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

body.theme-dark .game-shell {
  box-shadow: 0 10px 28px rgba(2, 6, 23, 0.35);
}

#gameCanvas {
  width: 100%;
  height: auto;
  display: block;
  background: #ffffff;
  border-radius: 10px;
  touch-action: none;
}

.board-wrap {
  position: relative;
}

.bottom-panel {
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 0 2px;
}

#statusText {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.win-overlay {
  position: absolute;
  inset: 0;
  border-radius: 10px;
  background: var(--overlay-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.win-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.confetti-layer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: 10px;
  pointer-events: none;
}

.confetti {
  position: absolute;
  top: -18px;
  width: 10px;
  height: 16px;
  border-radius: 2px;
  left: var(--x, 50%);
  background: var(--c, #f59e0b);
  opacity: 0.95;
  transform: rotate(var(--r, 0deg));
  animation: confetti-fall var(--d, 2s) ease-in forwards;
  animation-delay: var(--delay, 0s);
}

.win-card {
  position: relative;
  z-index: 2;
  text-align: center;
  background: var(--card-bg);
  color: var(--card-text);
  border-radius: 14px;
  padding: 22px 22px 18px;
  min-width: 260px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.28);
}

.win-card h2 {
  margin: 0 0 8px;
  font-size: 34px;
}

.win-card p {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 600;
}

@keyframes confetti-fall {
  from {
    transform: translate3d(0, -16px, 0) rotate(0deg);
    opacity: 0.95;
  }
  to {
    transform: translate3d(var(--drift, 0px), 430px, 0) rotate(720deg);
    opacity: 0.08;
  }
}

@media (max-width: 760px) {
  .top-controls {
    top: 8px;
    right: 8px;
  }

  .control-btn,
  .primary-btn {
    font-size: 13px;
    padding: 7px 10px;
  }

  .game-shell {
    margin-top: 44px;
    padding: 0;
  }

  #statusText {
    font-size: 16px;
  }
}