*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  color: #1c2530;
  background: #f5f7f9;
}

.page-header,
main,
.page-footer {
  width: 100%;
  max-width: 56rem;
  margin: 0 auto;
  padding: 0 1rem;
}

.page-header {
  padding-top: 1.5rem;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  line-height: 1.2;
}

h2 {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
}

h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

p {
  margin: 0 0 0.75rem;
}

button,
input {
  font: inherit;
}

:focus-visible {
  outline: 3px solid #e08a00;
  outline-offset: 2px;
}

.notice {
  padding: 0.75rem 1rem;
  background: #fff4d6;
  border-radius: 6px;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.tab {
  flex: 1 1 6rem;
  min-height: 2.75rem;
  padding: 0.5rem 1rem;
  border: 2px solid #245b8f;
  border-radius: 6px;
  background: #fff;
  color: #245b8f;
  font-weight: 600;
  cursor: pointer;
}

.tab[aria-selected="true"] {
  background: #245b8f;
  color: #fff;
}

.panel {
  padding: 1.25rem 1rem;
  background: #fff;
  border: 1px solid #d8dee4;
  border-radius: 8px;
}

.fields {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 13rem), 1fr));
  gap: 0.75rem 1rem;
  margin: 1rem 0;
}

.field label {
  display: block;
  font-weight: 600;
}

.field input {
  display: block;
  width: 100%;
  min-height: 2.75rem;
  margin-top: 0.25rem;
  padding: 0.5rem 0.625rem;
  border: 1px solid #8894a0;
  border-radius: 6px;
  background: #fff;
  color: inherit;
}

.field input[aria-invalid="true"] {
  border: 2px solid #b3261e;
}

.hint,
.error {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
}

.hint {
  color: #52606d;
}

.error {
  color: #b3261e;
  font-weight: 600;
}

.error:empty {
  display: none;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.actions button {
  min-height: 2.75rem;
  padding: 0.5rem 1.25rem;
  border: 2px solid #245b8f;
  border-radius: 6px;
  background: #fff;
  color: #245b8f;
  font-weight: 600;
  cursor: pointer;
}

.actions .primary {
  background: #245b8f;
  color: #fff;
}

.result:not(:empty) {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-left: 4px solid #2e7d32;
  background: #eef6ee;
  border-radius: 4px;
}

.result.has-error {
  border-left-color: #b3261e;
  background: #fbeceb;
}

.summary {
  font-size: 1.2rem;
}

.steps {
  margin: 0;
  padding-left: 1.25rem;
}

.steps li,
.formula li,
.result-error {
  overflow-wrap: anywhere;
}

.result-error {
  margin: 0;
  color: #b3261e;
  font-weight: 600;
}

.formula {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid #d8dee4;
}

.formula ul {
  margin: 0 0 0.75rem;
  padding-left: 1.25rem;
}

.page-footer {
  padding-top: 1rem;
  padding-bottom: 2rem;
  color: #52606d;
  font-size: 0.9rem;
}

[hidden] {
  display: none !important;
}