* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #042354;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  background: #fff;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

h2 {
  text-align: center;
  margin-bottom: 25px;
}

.client-details,
.add-item {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.client-details input,
.add-item input {
  flex: 1;
  padding: 10px;
}

.add-item button {
  padding: 10px 15px;
  cursor: pointer;
  background: #111;
  color: #fff;
  border: none;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

table th,
table td {
  border: 1px solid #ddd;
  padding: 10px;
  text-align: center;
}

table th {
  background: #f1f1f1;
}

.total-section {
  text-align: right;
  margin-top: 20px;
}

.print-btn {
  margin-top: 20px;
  padding: 12px 20px;
  background: green;
  color: #fff;
  border: none;
  cursor: pointer;
}

/* RESPONSIVE */
@media(max-width: 768px) {
  .client-details,
  .add-item {
    flex-direction: column;
  }
}