:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #1d1d1b;
  background: #eceae5;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  --paper: #faf9f6;
  --ink-muted: #66635d;
  --line: #d5d1c8;
  --accent: #145c43;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
}

main {
  width: min(100% - 32px, 680px);
  margin: 48px auto;
  padding: 40px;
  background: var(--paper);
  box-shadow: 0 1px 2px rgb(0 0 0 / 8%), 0 16px 40px rgb(0 0 0 / 7%);
}

header { margin-block-end: 40px; }

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1, h2, p { margin-block-start: 0; }

h1 {
  margin-block-end: 8px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.3rem, 8vw, 4rem);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -.04em;
}

.intro {
  margin: 0;
  color: var(--ink-muted);
  line-height: 1.5;
}

h2 {
  margin-block-end: 20px;
  font-size: 1rem;
  letter-spacing: .01em;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr minmax(150px, 190px);
  align-items: center;
  gap: 20px;
  margin-block: 14px;
}

label { font-weight: 600; }
label small { display: block; margin-block-start: 3px; color: var(--ink-muted); font-weight: 400; }

.input-wrap {
  display: flex;
  align-items: center;
  border: 1px solid #aaa69d;
  background: #fff;
}

.input-wrap:focus-within {
  outline: 3px solid color-mix(in srgb, var(--accent) 30%, transparent);
  outline-offset: 1px;
  border-color: var(--accent);
}

input {
  min-width: 0;
  min-height: 44px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 1rem;
}

.input-wrap input {
  width: 100%;
  padding: 10px 4px 10px 12px;
  text-align: end;
  font-variant-numeric: tabular-nums;
  outline: 0;
}

.input-wrap span {
  min-width: 44px;
  padding-inline: 8px 12px;
  color: var(--ink-muted);
  font-size: .875rem;
  text-align: end;
}

summary:focus-visible,
button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 35%, transparent);
  outline-offset: 3px;
}

details { margin-block-start: 32px; }
summary { width: max-content; color: var(--accent); font-weight: 650; cursor: pointer; }

.rates {
  display: grid;
  grid-template-columns: 1fr 150px;
  align-items: center;
  gap: 12px 20px;
  margin-block-start: 20px;
}

.rates label { font-size: .875rem; }
.saved { margin: 12px 0 0; color: var(--ink-muted); font-size: .8125rem; }

.result {
  margin-block-start: 48px;
  padding-block-start: 28px;
  border-block-start: 2px solid #24231f;
}

.result-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
}

.result-head h2 { margin: 0; }
#total {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2.25rem;
  font-variant-numeric: tabular-nums;
}

pre {
  margin: 28px 0 20px;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #f1efe9;
  font: 0.875rem/1.65 ui-monospace, SFMono-Regular, Consolas, monospace;
  white-space: pre-wrap;
}

button {
  min-height: 44px;
  padding: 10px 16px;
  border: 0;
  border-radius: 2px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  transition: background-color 120ms ease, transform 120ms ease;
}

button:hover { background: #0d4833; }
button:active { transform: scale(.96); }
#copy-status { min-height: 1.25em; margin: 10px 0 0; color: var(--accent); font-size: .875rem; }

.login-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(100%, 440px);
  margin: 0;
}

.login-card h1 { font-size: clamp(2.5rem, 12vw, 3.75rem); }
.login-card .intro { max-width: 34ch; }

.login-form {
  display: grid;
  gap: 12px;
  margin-block-start: 40px;
}

.login-form button { margin-block-start: 4px; }
.login-error { margin: 0; color: #a1281c; font-size: .875rem; }
.login-card > .saved { margin-block-start: 16px; }

@media (max-width: 560px) {
  main { width: 100%; margin: 0; padding: 28px 20px; box-shadow: none; }
  header { margin-block-end: 32px; }
  .field-row { grid-template-columns: 1fr; gap: 8px; margin-block: 22px; }
  .rates { grid-template-columns: 1fr; gap: 7px; }
  .rates .input-wrap { margin-block-end: 8px; }
  .result { margin-block-start: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  button { transition: none; }
}