.petrotopic-calculated {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f9fafb;
  margin: 0;
  padding: 20px;
  color: #333;
}

.petrotopic-calculated .pc-container {
  max-width: 1600px;
  margin: 0 auto;
  background: white;
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.petrotopic-calculated h1 {
  text-align: center;
  font-weight: 700;
  color: #222;
  margin-bottom: 30px;
}

.petrotopic-calculated form label {
  display: block;
  margin-top: 20px;
  font-size: 16px;
  font-weight: 600;
  color: #444;
}

.petrotopic-calculated form input[type=number] {
  width: 100%;
  padding: 12px 15px;
  font-size: 16px;
  border: 2px solid #ccc;
  border-radius: 6px;
  transition: border-color 0.3s ease;
}

.petrotopic-calculated form input[type=number]:focus {
  border-color: #007bff;
  outline: none;
  box-shadow: 0 0 5px rgba(0,123,255,0.5);
}

.petrotopic-calculated .pc-result {
  margin-top: 30px;
  padding-top: 15px;
  border-top: 1px solid #eee;
}

.petrotopic-calculated h2 {
  margin-bottom: 15px;
  font-weight: 700;
  color: #007bff;
  border-bottom: 2px solid #007bff;
  padding-bottom: 5px;
}

.petrotopic-calculated table.pc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.petrotopic-calculated table.pc-table th,
.petrotopic-calculated table.pc-table td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid #ddd;
}

.petrotopic-calculated table.pc-table th {
  background-color: #f0f8ff;
  color: #0056b3;
}

.petrotopic-calculated .pc-error {
  font-weight: bold;
  padding: 8px 12px;
  border: 1px solid red;
  background: #ffe5e5;
  border-radius: 4px;
}

@media (max-width: 480px) {
  .petrotopic-calculated .pc-container {
    padding: 20px 15px;
  }
  .petrotopic-calculated h1 {
    font-size: 22px;
  }
  .petrotopic-calculated form label {
    font-size: 14px;
  }
  .petrotopic-calculated form input[type=number] {
    font-size: 14px;
    padding: 10px 12px;
  }
  .petrotopic-calculated table.pc-table th,
  .petrotopic-calculated table.pc-table td {
    font-size: 13px;
    padding: 10px 8px;
  }
}