body { 
  font-family: 'Segoe UI', sans-serif; 
  text-align: center;
   background: #020617; 
   color: white; margin: 0; 
   padding: 20px; 
   user-select: none;
}
.header {
  display: flex; 
  justify-content: space-around; 
  background: #1e293b; padding: 15px; 
  border-radius: 12px; margin-bottom: 20px; 
  border: 2px solid #334155;
}
#grid {
  display: grid; 
  grid-template-columns: repeat(3, 100px); 
  gap: 15px; 
  justify-content: center;
}
.house {
  width: 100px; 
  height: 100px; 
  background: #1e293b; 
  border-radius: 12px; 
  cursor: pointer; 
  display: flex;
  align-items: center; 
  justify-content: center; 
  font-size: 2.5em; 
  border: 4px solid #334155;
  transition: all 0.1s;
}

.powered {
  background: #facc15;
  border-color: #fde047; 
  box-shadow: 0 0 15px #ca8a04;
}
.off {
  background: #1e293b; 
  border-color: #334155;
}
.leak {
  background: #450a0a; 
  border-color: #ef4444; 
  animation: shake 0.2s infinite;
}
.ai-mode {
  background: #064e3b !important; 
  border-color: #22c55e !important; 
  box-shadow: 0 0 25px #22c55e !important;
}

@keyframes shake {
  0% {
    transform: rotate(1deg); 
  }
  
  100% {
    transform: rotate(-1deg);
  }
}

#ai-btn {
  margin-top: 30px; 
  padding: 15px 30px; 
  font-size: 18px; 
  border-radius: 50px; 
  border: 2px solid #3b82f6; 
  background: #1e293b; 
  color: #3b82f6; 
  cursor: pointer; 
  font-weight: bold; 
  transition: 0.3s;
}
.can-afford {
  background: #3b82f6 !important; 
  color: white !important; 
  box-shadow: 0 0 15px #3b82f6;
}
#ai-btn:disabled {
  opacity: 0.5; 
  cursor: not-allowed;
}

#timer-box {
  width: 330px; 
  height: 10px; 
  background: #334155;
  margin: 15px auto; 
  border-radius: 5px; 
  overflow: hidden;
}
#timer-fill {
  width: 0%; 
  height: 100%; 
  background: #22c55e; 
  transition: width 0.1s linear;
}

#overlay {
  display: none; 
  position: fixed; 
  top: 0; 
  left: 0; 
  width: 100%; 
  height: 100%; 
  background: rgba(0,0,0,0.95); 
  z-index: 100; 
  flex-direction: column; 
  align-items: center; 
  justify-content: center;
}
.danger {
  color: #ef4444;
}