html {
  height: -webkit-fill-available;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  background: #f3f4f6;
  margin: 0;
  padding: 20px;
}

.app {
  max-width: 600px;
  margin: auto;
}

.screen {
  display: none;
}

.screen.active {
  display: block;
}

h1 {
  text-align: center;
}

h2 {
  text-align: center;
}

label {
  font-size: 13px;
  margin-top: 12px;
  display: block;
}

input {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  border-radius: 6px;
  border: 1px solid #e5e7eb;
  box-sizing: border-box;
}

button {
  width: 100%;
  padding: 12px;
  margin-top: 20px;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: bold;
}

.summary {
  background: #ffffff;
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 20px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

th, td {
  border: 1px solid #e5e7eb;
  padding: 6px;
  text-align: right;
}

th:first-child,
td:first-child {
  text-align: center;
}

.formula {
  margin-left: 12px;
}