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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
  color: white;
}

.container {
  max-width: 800px;
  margin: auto;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

h1 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 30px;
}

.balance-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.balance-card {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 20px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.balance-card h3 {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.balance-card .amount {
  font-size: 1.8rem;
  font-weight: bold;
  color: white;
}

.income { color: #4ade80 !important; }
.expense { color: #f87171 !important; }

.form-section {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 15px;
  padding: 25px;
  margin-bottom: 30px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
}

input {
  width: 100%;
  padding: 15px;
  border: none;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  font-size: 16px;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

input:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.btn {
  background: linear-gradient(135deg, #4ade80, #22c55e);
  color: white;
  padding: 15px;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
  width: 100%;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(74, 222, 128, 0.3);
}

.filter-section {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 10px 20px;
  border: none;
  border-radius: 25px;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  cursor: pointer;
  transition: 0.3s;
}

.filter-btn.active {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.05);
}

.transactions-list {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  padding: 20px;
  min-height: 200px;
}

.transaction-item {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  padding: 15px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: 0.3s;
}

.transaction-item:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateX(5px);
}

.transaction-info {
  flex: 1;
}

.transaction-title {
  font-weight: 600;
  margin-bottom: 5px;
}

.transaction-date {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
}

.transaction-amount {
  font-size: 1.1rem;
  font-weight: bold;
  margin-right: 15px;
}

.delete-btn {
  background: #ef4444;
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 5px;
  cursor: pointer;
  transition: 0.3s;
}

.delete-btn:hover {
  background: #dc2626;
  transform: scale(1.1);
}

.empty-state {
  text-align: center;
  color: rgba(255, 255, 255, 0.7);
  padding: 40px;
}

@media (max-width: 768px) {
  .container {
    padding: 20px;
    margin: 10px;
  }

  h1 {
    font-size: 2rem;
  }

  .balance-section {
    grid-template-columns: 1fr;
  }

  .transaction-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .transaction-amount {
    margin-right: 0;
  }
}