* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  background: linear-gradient(to right, #0f2027, #203a43, #2c5364);
  color: #fff;
  margin: 0;
  padding: 20px;
}

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

.container {
  max-width: 900px;
  margin: auto;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 0 15px rgba(0,0,0,0.3);
  animation: fadeIn 1s ease-in;
}

@keyframes fadeIn {
  from {opacity: 0; transform: translateY(-20px);}
  to {opacity: 1; transform: translateY(0);}
}

form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin-bottom: 20px;
}

form div {
  display: flex;
  flex-direction: column;
}

label {
  font-weight: 600;
  margin-bottom: 5px;
}

input, select {
  padding: 8px;
  border: none;
  border-radius: 5px;
  font-size: 16px;
}

button {
  padding: 10px;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
  color: white;
  transition: background 0.3s ease;
}

button:hover {
  opacity: 0.9;
}

.summary {
  display: flex;
  justify-content: space-around;
  margin-bottom: 20px;
  text-align: center;
}

.summary div {
  background: rgba(255, 255, 255, 0.1);
  padding: 15px;
  border-radius: 10px;
  width: 30%;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 10px;
  text-align: center;
}

th {
  background-color: #1f1f1f;
}

tr:nth-child(even) {
  background-color: rgba(255, 255, 255, 0.05);
}

.income {
  color: #00e676;
  font-weight: bold;
}

.expense {
  color: #ff5252;
  font-weight: bold;
}

.delete-btn {
  background-color: #ff1744;
  padding: 5px 10px;
  border-radius: 5px;
}