/* Background with gradient */
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea, #764ba2);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: #fff;
}

/* Main container */
.container {
  text-align: center;
  width: 400px;
}

/* Heading */
h1 {
  margin-bottom: 20px;
}

/* Converter card */
.converter-box {
  background: rgba(255, 255, 255, 0.1);
  padding: 20px;
  border-radius: 15px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(10px);
}

/* Inputs and selects */
input, select {
  width: 100%;
  padding: 10px;
  margin: 8px 0;
  border-radius: 8px;
  border: none;
  outline: none;
  font-size: 16px;
}

/* Row for units */
.row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.row select {
  width: 100%;
}

/* Button */
button {
  width: 100%;
  padding: 12px;
  margin-top: 12px;
  background: #ff7eb3;
  border: none;
  border-radius: 8px;
  color: white;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
}

button:hover {
  background: #ff4f81;
}

/* Result display */
.result {
  margin-top: 15px;
  font-size: 20px;
  font-weight: bold;
  color: #ffe082;
}