* {
  box-sizing: border-box;
}
html, body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top, #6f8bef 0%, #2d3f7a 100%);
  color: #f3f3f3;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}
.game-shell {
  width: min(980px, 100%);
  background: rgba(12, 22, 58, 0.95);
  border: 2px solid rgba(255, 255, 255, 0.16);
  border-radius: 22px;
  padding: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}
header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.pause-btn {
  border: none;
  background: #ff6b9d;
  color: #fff;
  font-weight: 700;
  padding: 10px 16px;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
  font-size: 0.95rem;
}
.pause-btn:hover {
  transform: translateY(-1px);
  background: #ff5287;
}
.pause-btn.paused {
  background: #4ade80;
}
.pause-btn.paused:hover {
  background: #38a169;
}
.status {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.status div {
  background: rgba(255, 255, 255, 0.08);
  padding: 10px 14px;
  border-radius: 12px;
  min-width: 110px;
  text-align: center;
  font-weight: 600;
}
.hints {
  flex: 1 1 220px;
  align-self: center;
  color: #c9d3ff;
}
.canvas-container {
  border: 2px solid rgba(255, 255, 255, 0.12);
  border-radius: 20px;
  overflow: hidden;
  background: #111a42;
  position: relative;
}
.next-level-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: linear-gradient(135deg, #7ce8c9, #4ade80);
  color: #0c1734;
  border: none;
  padding: 18px 32px;
  font-size: 1.3rem;
  font-weight: 800;
  border-radius: 18px;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(124, 232, 201, 0.4);
  transition: all 0.2s ease;
  z-index: 10;
}
.next-level-btn:hover {
  transform: translate(-50%, -50%) scale(1.08);
  box-shadow: 0 12px 30px rgba(124, 232, 201, 0.6);
}
.next-level-btn:active {
  transform: translate(-50%, -50%) scale(0.98);
}
canvas {
  display: block;
  width: 100%;
  height: auto;
}
.panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 16px;
}
.panel {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  padding: 16px;
}
.panel h2 {
  margin: 0 0 10px;
  font-size: 1.08rem;
}
.skin-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.skin-card {
  flex: 1 1 160px;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  text-align: center;
  color: #d7dbff;
}
.skin-card.unlocked {
  border-color: #7ce8c9;
  background: rgba(124, 232, 201, 0.12);
}
.upgrade-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}
.upgrade-btn {
  flex: 1 1 120px;
  padding: 12px;
  border-radius: 12px;
  border: 2px solid #7ce8c9;
  background: rgba(124, 232, 201, 0.1);
  color: #d7dbff;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  font-weight: 600;
  font-size: 0.9rem;
}
.upgrade-btn:hover:not(:disabled) {
  background: rgba(124, 232, 201, 0.25);
  transform: translateY(-2px);
}
.upgrade-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  border-color: #888;
}
.upgrade-btn.purchased {
  border-color: #4ade80;
  background: rgba(74, 222, 128, 0.15);
}
.upgrade-title {
  font-weight: 700;
  font-size: 1rem;
}
.upgrade-cost {
  font-size: 0.85rem;
  color: #ffde59;
  margin: 4px 0;
}
.upgrade-status {
  font-size: 0.8rem;
  color: #c9d3ff;
}
#restartButton {
  border: none;
  background: #7ce8c9;
  color: #0c1734;
  font-weight: 700;
  padding: 12px 18px;
  border-radius: 16px;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}
#restartButton:hover {
  transform: translateY(-1px);
  background: #6bd4b2;
}
@media (max-width: 760px) {
  .panels {
    grid-template-columns: 1fr;
  }
}