* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Arial', sans-serif;
  background-color: #f4f4f4;
  color: #333;
  line-height: 1.6;
}

header {
  background-color: #222;
  color: #fff;
  padding: 20px;
  text-align: center;
}

nav a {
  color: #fff;
  margin: 0 15px;
  text-decoration: none;
}

main {
  padding: 20px;
}

.intro {
  text-align: center;
  margin-bottom: 30px;
}

.workouts {
  margin-bottom: 40px;
}

.workout-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 15px;
}

.workout-card {
  background-color: #fff;
  border: 1px solid #ddd;
  padding: 20px;
  text-align: center;
  border-radius: 8px;
  transition: transform 0.2s ease-in-out;
}

.workout-card:hover {
  transform: scale(1.05);
  background-color: #eaf4ea;
}

.timer-section {
  text-align: center;
  padding: 20px;
  background-color: #fff;
  border-radius: 10px;
}

.timer {
  font-size: 2em;
  margin: 10px 0;
}

.timer-controls button {
  padding: 10px 20px;
  margin: 5px;
  background-color: #28a745;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.timer-controls button:hover {
  background-color: #218838;
}

footer {
  text-align: center;
  padding: 15px;
  background-color: #222;
  color: white;
  margin-top: 40px;
}