:root {
  --purple: #69e2a0;
  --silver: #c0c0c0;
  --dark-bg: #121212;
  --light-bg: #f5f5f5;
  --card-bg-dark: #1f1f1f;
  --card-bg-light: #ffffff;
  --text-dark: #ffffff;
  --text-light: #121212;
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 20px;
  transition: background 0.3s, color 0.3s;
}

body.dark {
  background: var(--dark-bg);
  color: var(--text-dark);
}

body.light {
  background: var(--light-bg);
  color: var(--text-light);
}

.logo {
  width: 150px;
  display: block;
  margin: 0 auto 10px;
}

.main-heading {
  text-align: center;
  font-size: 2em;
  color: var(--purple);
  margin-top: 10px;
}

.toggle-mode {
  position: fixed;
  top: 20px;
  right: 20px;
  cursor: pointer;
  padding: 8px 15px;
  border: none;
  background: var(--purple);
  color: white;
  border-radius: 20px;
}

.card {
  background: var(--card-bg-light);
  padding: 20px;
  margin: 20px auto;
  max-width: 500px;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  transition: background 0.3s, color 0.3s;
}

body.dark .card {
  background: var(--card-bg-dark);
  color: var(--text-dark);
}

.card h2 {
  margin-top: 0;
  color: var(--purple);
}

.input-group {
  margin: 15px 0;
}

.input-group label {
  display: block;
  margin-bottom: 5px;
}

.input-group input,
.input-group select {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--silver);
}

.results p {
  font-size: 1.1em;
  margin: 10px 0;
}

.note {
  font-size: 0.9em;
  color: var(--purple);
  text-align: center;
}

.card .note {
  font-weight: bold;
  margin-bottom: 10px;
}

#lotSize1 {
  font-weight: bold;
  color: var(--purple);
  font-size: 1.2em;
}

.contact-btn, button {
  padding: 10px 20px;
  background: var(--purple);
  border: none;
  border-radius: 10px;
  color: white;
  margin-top: 10px;
  cursor: pointer;
}

.warning {
  color: #ff4e4e;
  font-weight: bold;
}

#pl {
  font-weight: bold;
  color: var(--purple);
}