body {
  font-family: Arial, Helvetica, sans-serif;
  background: #f6f7f9;
  margin: 0;
  color: #222;
}
.container {
  max-width: 1000px;
  margin: auto;
  padding: 20px;
}
h1,
h2 {
  color: #0b3c74;
}
.calculator {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 30px;
}
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
input,
select,
button {
  padding: 10px;
  font-size: 16px;
}
input,
select {
  border: 1px solid #bbb;
  border-radius: 4px;
}
button {
  background: #4f7f2c;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
button.clear {
  background: #999;
}
.result {
  font-weight: bold;
  color: #1b7e1b;
  margin-top: 10px;
  font-size: 18px;
}
@media (max-width: 600px) {
  .row {
    flex-direction: column;
    align-items: flex-start;
  }
}

.footer-bottom {
  background-color: #3b82f6;
  border-top: 1px solid rgba(245, 241, 235, 0.2);
  padding-top: 1rem;
  text-align: center;
}
.footer-bottom a {
  text-decoration: none;
  color: #f0f4f7;
  margin: 2px;
}
.footer-bottom a:hover {
  text-decoration: underline;
}

.footer-bottom p {
  color: #f0f4f7;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}