@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

body {
  margin: 0;
  height: 100vh;
  font-family: 'Poppins', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(-45deg, #f34a53, #ce4c9e, #6a11cb, #2575fc);
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
  color: #fff;
}

.container {
  background: rgba(0, 0, 0, 0.5);
  padding: 2.5rem 3rem;
  border-radius: 20px;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.4);
  text-align: center;
  width: 360px;
}

h1 {
  font-weight: 700;
  margin-bottom: 1.2rem;
  letter-spacing: 2px;
  font-size: 2.4rem;
  text-shadow: 0 0 8px #ff6ec4, 0 0 15px #7878ff;
}

.display {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: 3px;
  text-shadow: 0 0 10px #fff;
}

.buttons {
  display: flex;
  justify-content: space-between;
  gap: 0.7rem;
  flex-wrap: wrap;
}

button {
  flex: 1 1 40%;
  border: none;
  padding: 0.8rem 1.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  color: white;
  user-select: none;
}

button:active {
  transform: scale(0.95);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

#start {
  background: #00c851;
  box-shadow: 0 6px 12px #00c851cc;
}
#pause {
  background: #ed8864;
  box-shadow: 0 6px 12px #ffbb33cc;
  color: #222;
}
#reset {
  background: #ff4444;
  box-shadow: 0 6px 12px #ff4444cc;
}
#lap {
  background: #33b5e5;
  box-shadow: 0 6px 12px #33b5e5cc;
}

#laps {
  margin-top: 1.8rem;
  max-height: 180px;
  overflow-y: auto;
  padding-left: 0;
  list-style: none;
  text-align: left;
  font-size: 1rem;
  color: #eee;
  border-top: 1px solid #555;
}

#laps li {
  padding: 0.4rem 0;
  border-bottom: 1px solid #444;
  letter-spacing: 1px;
}