body {
  font-family: "Poppins", sans-serif;
  margin: 0;
  background: #f6f9fc;
  color: #333;
}

header {
  background: linear-gradient(90deg, #00b894, #0984e3);
  color: white;
  text-align: center;
  padding: 20px 0;
}

header h1 {
  margin-bottom: 5px;
}

section {
  width: 85%;
  margin: 20px auto;
  background: #fff;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.search, .calc, .chem, .tips {
  text-align: center;
}

.search input, .calc input {
  padding: 10px;
  width: 250px;
  border-radius: 6px;
  border: 1px solid #ccc;
}

button {
  padding: 10px 15px;
  background-color: #0984e3;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  margin: 5px;
}

button:hover {
  background-color: #0771c7;
}

.results, .chem-box, .impact-box {
  margin-top: 15px;
  background: #eef9f0;
  padding: 15px;
  border-radius: 8px;
  text-align: left;
}

.center-card {
  background: #e8f5e9;
  margin: 10px 0;
  padding: 15px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.tips ul {
  line-height: 1.8;
  text-align: left;
}

footer {
  text-align: center;
  background: #333;
  color: white;
  padding: 10px 0;
  margin-top: 30px;
}