:root {
  --light-grey: #f5f6f7;
  --dark-blue: #0a0a23;
  --fcc-blue: #1b1b32;
  --light-yellow: #fecc4c;
  --dark-yellow: #feac32;
  --light-pink: #ffadad;
  --dark-red: #850000;
  --light-green: #acd157;
  --card-bg: #2a2a40;
}

body {
  font-family: "Poppins", Helvetica, Arial, sans-serif;
  font-size: 18px;
  background: linear-gradient(135deg, var(--fcc-blue), var(--dark-blue));
  color: var(--light-grey);
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
}

main {
  max-width: 800px;
  margin: 40px auto;
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 25px 30px;
  box-shadow: 0px 6px 18px rgba(0,0,0,0.4);
}

h1 {
  text-align: center;
  font-size: 2.2rem;
  margin-bottom: 20px;
  color: var(--light-yellow);
}

.container {
  width: 100%;
}

label,
legend {
  font-weight: 600;
  margin-bottom: 6px;
}

fieldset {
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid var(--light-grey);
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 20px;
}

.input-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

input,
select {
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 1rem;
}

button {
  cursor: pointer;
  text-decoration: none;
  background: var(--light-yellow);
  border: 2px solid var(--dark-yellow);
  border-radius: 6px;
  padding: 10px 15px;
  font-weight: bold;
  transition: all 0.2s ease-in-out;
}

button:hover {
  background: var(--dark-yellow);
  color: white;
}

.controls {
  margin: 15px 0;
}

.output {
  border-radius: 8px;
  padding: 20px;
  margin-top: 25px;
  text-align: center;
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid var(--light-grey);
}

.output span {
  display: block;
  font-weight: bold;
  font-size: 1.5em;
  margin-bottom: 15px;
}

.surplus {
  color: var(--light-pink);
}

.deficit {
  color: var(--light-green);
}

a button {
  display: block;
  width: 100%;
  margin-top: 20px;
}