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

body {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.container {
  background: rgba(255, 255, 255, 0.95);
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
  width: 100%;
  max-width: 700px;
}

h1 {
  text-align: center;
  color: #333;
  margin-bottom: 20px;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.input-group {
  display: flex;
  gap: 10px;
}

input {
  flex: 1;
  padding: 10px;
  border: 2px solid #eee;
  border-radius: 8px;
  outline: none;
}

button {
  padding: 10px 15px;
  background: #764ba2;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
}

button:hover {
  background: #5a368c;
}

.stat-card {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 12px;
  margin-top: 20px;
}

.balance-info {
  margin-bottom: 20px;
}

#displayBalance {
  color: #27ae60;
  font-weight: bold;
}

.chart-container {
  width: 100%;
  max-width: 250px;
  margin: 0 auto;
}

#expenseList {
  margin-top: 20px;
  list-style: none;
}

#expenseList li {
  background: white;
  padding: 12px;
  margin-bottom: 8px;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid #eee;
  animation: slideIn 0.3s ease-out;
}

.delete-btn {
  background: #ff4757;
  padding: 5px 10px;
  font-size: 0.8rem;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}