/* Reset and base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: 'Poppins', Arial, sans-serif;
  background: #f4f6fb;
  color: #222;
  min-height: 100vh;
  background-color: rgb(13, 25, 92);
}
.container {
  max-width: 850px;
  margin: 2rem auto;
  background: #fff;
  border-radius: 16px;
  border: 3px solid #062557;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  padding: 2.5rem 2rem;
}
header {
  text-align: center;
  margin-bottom: 2rem;
}
header h1 {
  color: #062557;
  font-size: 2.5rem;
  letter-spacing: 1px;
}
.add-transaction, .stats, .filters, .transactions {
  margin-bottom: 2rem;
}
.add-transaction h2, .stats h2, .filters h2, .transactions h2 {
  margin-bottom: 1rem;
  color: #3a86ff;
  font-size: 1.3rem;
}
#transaction-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
#transaction-form input, #transaction-form select, #transaction-form button {
  flex: 1 1 120px;
  padding: 0.6rem;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
}
#transaction-form button {
  background: #3a86ff;
  color: #fff;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}
#transaction-form button:hover {
  background: #265d97;
}
.stat-cards {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.card {
  flex: 1 1 150px;
  background: #f1f8ff;
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
  box-shadow: 0 2px 8px rgba(58,134,255,0.07);
}
.card h3 {
  color: #265d97;
  margin-bottom: 0.5rem;
}
.card p {
  font-size: 1.3rem;
  font-weight: bold;
}
.filters {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.filters select, .filters input {
  padding: 0.5rem;
  border-radius: 8px;
  border: 1px solid #ddd;
}
.transactions ul {
  list-style: none;
}
#transaction-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #f9fafb;
  margin-bottom: 0.5rem;
  padding: 0.7rem 1rem;
  border-radius: 8px;
  border-left: 5px solid #3a86ff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.03);
}
#transaction-list li.income {
  border-left-color: #06d6a0;
}
#transaction-list li.expense {
  border-left-color: #ff006e;
}
#transaction-list .desc {
  flex: 2;
}
#transaction-list .amount {
  flex: 1;
  text-align: right;
  font-weight: bold;
}
#transaction-list .date {
  flex: 1;
  text-align: right;
  color: #888;
  font-size: 0.95rem;
}
#transaction-list .category {
  flex: 1;
  text-align: right;
  color: #3a86ff;
  font-size: 0.95rem;
}
@media (max-width: 600px) {
  .container {
    padding: 1rem 0.2rem;
  }
  .stat-cards {
    flex-direction: column;
    gap: 0.5rem;
  }
  #transaction-form {
    flex-direction: column;
    gap: 0.5rem;
  }
  .filters {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}