/* Formula box styling */
.formula-box {
  margin: 10px 0 0 0;
  padding: 12px 16px;
  background: #e3eafc;
  border-radius: 8px;
  color: #185a9d;
  font-size: 1.02rem;
  text-align: center;
  min-height: 28px;
  box-shadow: 0 1px 4px rgba(44, 62, 80, 0.07);
  transition: background 0.2s;
}
body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: linear-gradient(135deg, #74ebd5 0%, #acb6e5 100%);
  min-height: 100vh;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  max-width: 420px;
  margin: 40px auto;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 18px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.18);
  padding: 38px 28px 38px 28px;
  backdrop-filter: blur(2px);
}

h1 {
  text-align: center;
  color: #2d3a4a;
  margin-bottom: 32px;
  font-size: 2.1rem;
  letter-spacing: 1px;
  font-weight: 700;
}

.converter {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.input-group {
  display: flex;
  gap: 12px;
  align-items: center;
}

input[type="number"],
input[type="text"] {
  flex: 1;
  padding: 12px 14px;
  border: none;
  border-radius: 8px;
  font-size: 1.08rem;
  background: #f4f8fb;
  box-shadow: 0 1px 4px rgba(44, 62, 80, 0.07);
  outline: none;
  transition: box-shadow 0.2s;
}
input[type="number"]:focus,
input[type="text"]:focus {
  box-shadow: 0 2px 8px rgba(44, 62, 80, 0.13);
}

select {
  padding: 12px 10px;
  border: none;
  border-radius: 8px;
  font-size: 1.08rem;
  background: #e3eafc;
  color: #2d3a4a;
  box-shadow: 0 1px 4px rgba(44, 62, 80, 0.07);
  outline: none;
  transition: box-shadow 0.2s;
}
select:focus {
  box-shadow: 0 2px 8px rgba(44, 62, 80, 0.13);
}

button {
  padding: 13px;
  background: linear-gradient(90deg, #43cea2 0%, #185a9d 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 10px;
  box-shadow: 0 2px 8px rgba(44, 62, 80, 0.13);
  letter-spacing: 0.5px;
  transition: background 0.2s, transform 0.15s;
}
button:hover {
  background: linear-gradient(90deg, #185a9d 0%, #43cea2 100%);
  transform: translateY(-2px) scale(1.03);
}

.arrow {
  text-align: center;
  font-size: 2.3rem;
  color: #43cea2;
  margin: 0 auto;
  display: block;
  filter: drop-shadow(0 1px 2px #185a9d33);
}

@media (max-width: 600px) {
  body {
    padding: 0;
    min-height: 100vh;
    align-items: flex-start;
  }
  .container {
    max-width: 98vw;
    width: 98vw;
    margin: 16px auto;
    padding: 12px 2vw 18px 2vw;
    border-radius: 12px;
  }
  h1 {
    font-size: 1.1rem;
    margin-bottom: 18px;
  }
  .arrow {
    font-size: 1.2rem;
  }
  .input-group {
    flex-direction: column;
    gap: 7px;
    align-items: stretch;
  }
  input[type="number"],
  input[type="text"],
  select {
    font-size: 0.98rem;
    padding: 10px 8px;
    border-radius: 6px;
  }
  button {
    font-size: 1rem;
    padding: 10px;
    border-radius: 6px;
  }
  .formula-box {
    font-size: 0.95rem;
    padding: 8px 6px;
    border-radius: 6px;
  }
}