body {
  font-family: Arial, sans-serif;
  background: #f5f7fa;
  color: #222;
  margin: 0;
  padding: 0;
  text-align: center;
}
header {
  background: #111;
  color: #fff;
  padding: 10px;
  position: sticky;
  top: 0;
}
.lang-switcher {
  position: absolute;
  right: 20px;
  top: 15px;
}
.gas-dashboard {
  margin-top: 20px;
}
.gas-card {
  display: inline-block;
  margin: 10px;
  padding: 15px;
  border-radius: 10px;
  font-size: 18px;
}
.low { background: #b2f7ef; }
.standard { background: #fef9c7; }
.fast { background: #ffadad; }
.simulator {
  margin-top: 40px;
}
input {
  margin: 5px;
  padding: 8px;
}
button {
  padding: 8px 12px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}
footer {
  margin-top: 40px;
  padding: 10px;
  background: #eee;
}
.footer-links a {
  margin: 0 8px;
  color: #007bff;
  text-decoration: none;
}