* {
  box-sizing: border-box;
}

:root {
  --bg: #1a1a2e;
  --fg: #f5f5f5;
  --accent: #00d4ff;
  --accent-dark: #0099cc;
  --grid-bg: #2d3a5c;
  --dot: #ff6b9d;
  --p1: #52b5e8;
  --p2: #ff6b9d;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f5f5;
    --fg: #1a1a2e;
    --grid-bg: #e8eef5;
    --dot: #ff2d55;
    --p1: #0099cc;
    --p2: #ff2d55;
  }
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

#wrap {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 100%;
  overflow: hidden;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  gap: 1rem;
}

.back-hub {
  font-size: 1.5rem;
  color: var(--accent);
  text-decoration: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 0.5rem;
  transition: background 0.2s;
}

.back-hub:active {
  background: rgba(0, 212, 255, 0.2);
}

.brand {
  flex: 1;
  font-size: 1.25rem;
  font-weight: bold;
  text-align: center;
}

.brand b {
  color: var(--accent);
}

.hchips {
  display: flex;
  gap: 0.5rem;
}

.chip {
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--accent);
  border-radius: 1rem;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-wrap: nowrap;
}

.coins-chip {
  cursor: pointer;
  transition: transform 0.2s;
}

.coins-chip:active {
  transform: scale(0.95);
}

.hud {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.05);
  flex-wrap: wrap;
  justify-content: center;
}

.board-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  overflow: hidden;
  min-height: 0;
}

canvas {
  max-width: 100%;
  max-height: 100%;
  display: block;
  touch-action: none;
}

footer {
  padding: 0.75rem 1rem;
  text-align: center;
  font-size: 0.85rem;
  background: rgba(0, 0, 0, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  padding: 1rem;
}

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

.card {
  background: var(--bg);
  border: 2px solid var(--accent);
  border-radius: 1rem;
  padding: 2rem;
  max-width: 400px;
  width: 100%;
  text-align: center;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.logo {
  font-size: 2.5rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}

.logo b {
  color: var(--accent);
}

.sub {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 1.5rem;
}

@media (prefers-color-scheme: light) {
  .sub {
    color: rgba(26, 26, 46, 0.7);
  }
}

.stats {
  display: flex;
  gap: 1rem;
  margin: 1rem 0;
  justify-content: center;
}

.stat {
  background: rgba(0, 212, 255, 0.1);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  min-width: 80px;
}

.lbl {
  font-size: 0.75rem;
  opacity: 0.7;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.val {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--accent);
}

.mode-select, .difficulty-select, .size-select {
  display: flex;
  gap: 0.5rem;
  margin: 1rem 0;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-ghost {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: var(--fg);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.2s;
  flex: 1;
  min-width: 60px;
}

.btn-ghost:active {
  background: rgba(0, 212, 255, 0.2);
  border-color: var(--accent);
}

.btn-ghost.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.btn-primary {
  background: var(--accent);
  border: none;
  color: var(--bg);
  padding: 0.75rem 2rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  font-weight: bold;
  transition: all 0.2s;
  width: 100%;
  margin: 0.75rem 0;
}

.btn-primary:active {
  transform: scale(0.98);
  box-shadow: 0 4px 8px rgba(0, 212, 255, 0.3);
}

.btn-share {
  background: rgba(255, 107, 157, 0.2);
  border: 2px solid #ff6b9d;
  color: #ff6b9d;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  width: 100%;
  margin: 0.5rem 0;
  transition: all 0.2s;
}

.btn-share:active {
  background: rgba(255, 107, 157, 0.3);
}

.big {
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--accent);
  margin: 1rem 0;
}

.home {
  max-width: 350px;
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 212, 255, 0.9);
  color: #1a1a2e;
  padding: 1rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  z-index: 200;
  pointer-events: none;
  animation: fadeInOut 3s ease;
}

@keyframes fadeInOut {
  0% { opacity: 0; transform: translateX(-50%) translateY(10px); }
  10% { opacity: 1; transform: translateX(-50%) translateY(0); }
  90% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(10px); }
}

@media (max-width: 600px) {
  header {
    padding: 0.5rem 0.75rem;
  }

  .chip {
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
  }

  .card {
    padding: 1.5rem;
  }

  .logo {
    font-size: 2rem;
  }
}