:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #1d1d1f;
  background: #f5f5f7;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  min-height: 100svh;
}

input,
select {
  font: inherit;
}

input,
label,
select {
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgb(0 0 0 / 8%);
}

.app-shell {
  min-height: 100vh;
  min-height: 100svh;
  padding: max(24px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
}

.converter {
  width: min(100%, 420px);
  margin: 0 auto;
}

.intro {
  margin-bottom: 20px;
  padding-inline: 4px;
}

.intro h1 {
  margin: 0;
  font-size: clamp(2rem, 10vw, 2.75rem);
  font-weight: 750;
  line-height: 1.05;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.intro h1 span {
  color: #d52b1e;
}

.intro .lede {
  max-width: 38ch;
  margin: 8px 0 0;
  color: #6e6e73;
  font-size: 0.9rem;
  line-height: 1.45;
  text-wrap: pretty;
}

.calculator-card {
  padding: 20px;
  border-radius: 20px;
  background: #fff;
  box-shadow:
    0 0 0 1px rgb(0 0 0 / 4%),
    0 10px 30px rgb(0 0 0 / 5%);
}

.field-label,
.province-picker legend {
  display: block;
  margin-bottom: 8px;
  color: #515154;
  font-size: 0.8rem;
  font-weight: 600;
}

.amount-field {
  display: flex;
  align-items: center;
  height: 64px;
  margin-bottom: 20px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: #f5f5f7;
}

.amount-field:focus-within {
  border-color: #1d1d1f;
  outline: 3px solid rgb(0 0 0 / 10%);
}

.amount-field input {
  min-width: 0;
  width: 100%;
  height: 100%;
  padding: 0 6px 0 16px;
  border: 0;
  outline: 0;
  color: #1d1d1f;
  background: transparent;
  font-size: 1.8rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.amount-field input::placeholder {
  color: #a3a3a3;
}

.amount-field span {
  padding: 0 16px 0 8px;
  color: #515154;
  font-size: 0.9rem;
  font-weight: 600;
}

.province-picker {
  min-width: 0;
  margin: 0 0 20px;
  padding: 0;
  border: 0;
}

.segments {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.segments label {
  position: relative;
  min-width: 0;
  cursor: pointer;
}

.segments input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.segments label > span {
  display: grid;
  place-items: center;
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: #f5f5f7;
  font-size: 0.9rem;
  font-weight: 700;
  transition:
    transform 120ms cubic-bezier(0.2, 0, 0, 1),
    color 120ms ease-out,
    background-color 120ms ease-out,
    border-color 120ms ease-out;
}

.segments label > small {
  position: absolute;
  overflow: hidden;
  width: 1px;
  height: 1px;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.segments input:checked + span {
  border-color: #1d1d1f;
  color: #fff;
  background: #1d1d1f;
}

.segments input:focus-visible + span {
  outline: 3px solid rgb(0 0 0 / 14%);
  outline-offset: 2px;
}

.segments label:active > span {
  transform: scale(0.96);
}

.option-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  padding: 10px 0;
  border-top: 1px solid #e5e5ea;
  border-bottom: 1px solid #e5e5ea;
  cursor: pointer;
}

.option-toggle span {
  display: grid;
  gap: 2px;
}

.option-toggle strong {
  font-size: 0.9rem;
}

.option-toggle small {
  color: #6e6e73;
  font-size: 0.8rem;
}

.option-toggle input {
  width: 20px;
  height: 20px;
  margin: 0 2px 0 16px;
  accent-color: #1d1d1f;
  cursor: pointer;
}

.option-toggle + .option-toggle {
  border-top: 0;
}

.tip-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  padding: 8px 0;
  border-bottom: 1px solid #e5e5ea;
}

.tip-option:not([hidden]) {
  transition:
    opacity 160ms cubic-bezier(0.2, 0, 0, 1),
    transform 160ms cubic-bezier(0.2, 0, 0, 1);
}

.tip-option[hidden] {
  display: none;
}

.tip-option label {
  color: #515154;
  font-size: 0.8rem;
  font-weight: 600;
}

.tip-option select {
  height: 40px;
  min-width: 92px;
  padding: 0 8px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: #1d1d1f;
  background: #f5f5f7;
}

.tip-option select:focus-visible {
  outline: 3px solid rgb(0 0 0 / 14%);
  outline-offset: 2px;
}

.result {
  display: grid;
  padding: 24px 0 20px;
  border-bottom: 1px solid #d2d2d7;
}

.result-label {
  color: #6e6e73;
  font-size: 0.8rem;
  font-weight: 600;
}

.result strong {
  margin: 3px 0 12px;
  font-size: clamp(2.7rem, 14vw, 3.5rem);
  font-weight: 750;
  line-height: 1;
  letter-spacing: -0.045em;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.result-detail,
.result-total {
  color: #6e6e73;
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.result-total {
  margin-top: 2px;
  color: #1d1d1f;
  font-weight: 700;
}

.province-info {
  display: grid;
  gap: 4px;
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  background: #f5f5f7;
  font-size: 0.8rem;
  line-height: 1.45;
  text-wrap: pretty;
}

.province-info strong {
  font-size: 0.8rem;
}

.province-info span {
  color: #515154;
}

footer {
  padding-top: 16px;
  color: #6e6e73;
  font-size: 0.7rem;
  line-height: 1.45;
  text-wrap: pretty;
}

footer p {
  margin: 0 0 6px;
}

.rate-status {
  display: flex;
  align-items: center;
  gap: 7px;
  color: #515154;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.rate-status > span:first-child {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #16803c;
}

.rate-status.is-stale > span:first-child {
  background: #a16207;
}

@media (hover: hover) {
  .segments label:hover > span,
  .tip-option select:hover {
    border-color: #c7c7cc;
  }

  .segments input:checked + span {
    border-color: #1d1d1f;
  }
}

@starting-style {
  .tip-option:not([hidden]) {
    opacity: 0;
    transform: translateY(-4px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .segments label > span {
    transition: opacity 80ms ease-out;
  }

  .segments label:active > span {
    opacity: 0.72;
    transform: none;
  }

  .tip-option:not([hidden]) {
    transform: none;
    transition: opacity 100ms ease-out;
  }
}

@media (min-width: 600px) {
  .app-shell {
    display: grid;
    place-items: center;
    padding-block: 48px;
  }
}