* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}

body {
  background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
  color: white;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: backgroundMove 10s infinite alternate linear; 
}

@keyframes backgroundMove {
  0% { background-position: left; }
  100% { background-position: right; }
}

.container {
  text-align: center;
  background: rgba(0, 0, 0, 0.6);
  padding: 50px 40px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: transform 0.3s ease;
}

.container:hover {
  transform: scale(1.02);
}

#display {
  font-size: 4rem;
  margin: 20px 0;
  letter-spacing: 3px;
  font-weight: bold;
  text-shadow: 0 0 10px #00adb5;
}

.buttons button {
  margin: 10px 8px;
  padding: 12px 25px;
  font-size: 1.1rem;
  font-weight: 500;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: linear-gradient(145deg, #00adb5, #008891);
  color: white;
  box-shadow: 0 4px 15px rgba(0, 173, 181, 0.3);
  transition: 0.3s ease-in-out;
}

.buttons button:hover {
  background: linear-gradient(145deg, #007b80, #00696e);
  box-shadow: 0 6px 20px rgba(0, 123, 128, 0.6);
  transform: translateY(-2px);
}

#laps {
  margin-top: 25px;
  list-style: none;
  padding: 0;
  max-height: 180px;
  overflow-y: auto;
}

#laps li {
  padding: 8px 12px;
  background-color: rgba(255, 255, 255, 0.1);
  border-left: 4px solid #00adb5;
  border-radius: 6px;
  margin-bottom: 8px;
  text-align: left;
  transition: background 0.2s;
}

#laps li:hover {
  background-color: rgba(255, 255, 255, 0.15);
}