/* Base Styles and Variables */
:root {
  --primary-color: #3373dc;
  --primary-hover: #2360c3;
  --secondary-color: #f5f7fa;
  --success-color: #4CAF50;
  --error-color: #f44336;
  --text-color: #f5f7fa;
  --border-color: #2c374a;
  --border-radius: 4px;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  --transition: all 0.3s ease;
  --background-color: #F1F5F9;
  --card-background: #0F172A;
  --input-background: #141c2b;
}

/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Typography */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  padding: 20px;
}

h1 {
  color: var(--primary-color);
  margin-bottom: 20px;
  text-align: center;
  font-size: 28px;
  font-weight: 600;
}

h2 {
  font-size: 22px;
  margin-bottom: 15px;
  color: var(--text-color);
}

/* Container and Layout */
.container {
  max-width: 1000px;
  margin: 0 auto;
  background-color: var(--card-background);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

/* Selection Screen */
#calculator-selection {
  padding: 40px;
  text-align: center;
}

.calculator-selection {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  margin-top: 30px;
}

/* Autofill Animation */
@keyframes autofill {
  to {
    background: transparent;
    color: var(--text-color);
  }
}