body {
  font-family: "Arial", sans-serif;
  margin: 0;
  background: #fefefe;
  color: #222;
}

header.site-header {
  background: linear-gradient(to right, #ffe600, #00cfff);
  color: #000;
  padding: 20px 0;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.container {
  width: 90%;
  max-width: 800px;
  margin: auto;
}

.calc-card {
  background: #fffdf5;
  border: 2px solid #00cfff;
  border-radius: 12px;
  padding: 20px;
  margin-top: 30px;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

.calc-card input, .calc-card button {
  padding: 10px;
  font-size: 1rem;
  margin: 5px;
  border-radius: 8px;
  border: 1px solid #ccc;
}

.calc-card button {
  background: #ffe600;
  color: #000;
  border: none;
  cursor: pointer;
}

.calc-card button:hover {
  background: #fff154;
}

.product-item {
  margin: 10px 0;
  background: #f0fbff;
  padding: 10px;
  border-left: 4px solid #00cfff;
}

.results {
  margin-top: 20px;
  font-size: 1.1rem;
}

footer {
  text-align: center;
  padding: 20px;
  background: #222;
  color: #eee;
  margin-top: 40px;
}