body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  display: flex;
  justify-content: center;
  padding-top: 40px;
  background-color: #f0f2f5;
}

.tracker-card {
  background: white;
  padding: 1.5rem;
  border-radius: 16px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.1);
  width: 350px;
  text-align: center;
}

select {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #ddd;
  margin-bottom: 15px;
  font-size: 1rem;
}

#display {
  font-size: 3.5rem;
  font-weight: bold;
  color: #1a73e8;
  margin: 15px 0;
  font-variant-numeric: tabular-nums;
}

.controls button {
  width: 45%;
  padding: 12px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: 0.2s;
}

#startBtn { background: #34a853; color: white; }
#stopBtn { background: #ea4335; color: white; }
button:disabled { background: #ccc; cursor: not-allowed; }

.stats-header {
  margin-top: 25px;
  font-weight: bold;
  text-align: left;
  border-bottom: 2px solid #eee;
  padding-bottom: 5px;
}

#log {
  list-style: none;
  padding: 0;
  margin-top: 10px;
  max-height: 200px;
  overflow-y: auto;
  text-align: left;
}

.log-item {
  font-size: 0.85rem;
  padding: 8px;
  border-bottom: 1px solid #f9f9f9;
  display: flex;
  justify-content: space-between;
}

.log-category { font-weight: bold; color: #555; }