body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
}

.container {
  text-align: center;
  background: rgba(0,0,0,0.3);
  padding: 30px;
  border-radius: 15px;
}

h1 {
  margin-bottom: 20px;
}

#timeInput {
  padding: 10px;
  border: none;
  border-radius: 8px;
}

button {
  margin-left: 10px;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  background: #ff6b6b;
  color: white;
  cursor: pointer;
}

button:hover {
  background: #ff4757;
}

#timer {
  margin-top: 30px;
  font-size: 2rem;
  font-weight: bold;
}
#celebration {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.8);
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

#celebration img {
  max-width: 100%;
  max-height: 100%;
  object-fit: cover;
}