:root {
  /* EASY CUSTOMIZATION */
  --primary-color: #2563eb;
  --bg-color: #f9fafb;
  --card-bg: #ffffff;
  --text-color: #111827;
  --border-color: #e5e7eb;
  --currency-symbol: "₹";
}

* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  margin: 0;
  background: var(--bg-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  padding: 20px;
}

.calculator {
  width: 100%;
  max-width: 420px;
  background: var(--card-bg);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.05);
}

h1 {
  font-size: 1.4rem;
  margin-bottom: 20px;
  text-align: center;
}

.field {
  margin-bottom: 14px;
}

label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 6px;
}

input,
select {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  outline: none;
}

input:focus,
select:focus {
  border-color: var(--primary-color);
}

.results {
  margin-top: 20px;
  padding: 15px;
  background: #f3f4f6;
  border-radius: 10px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.result-row strong {
  color: var(--primary-color);
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.25rem;
  }
}