:root {
  --paper: #edf5f1;
  --paper-deep: #dcebe6;
  --ink: #102d37;
  --ink-soft: #47636a;
  --line: #96b4ad;
  --brass: #a66e1f;
  --brass-pale: #f0dfbd;
  --seal: #b64738;
  --white: #fbfdfc;
  --shadow: 0 24px 70px rgba(16, 45, 55, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--paper);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(71, 99, 106, 0.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(71, 99, 106, 0.075) 1px, transparent 1px);
  background-size: 24px 24px;
}

button,
input {
  font: inherit;
}

button:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(166, 110, 31, 0.35);
  outline-offset: 3px;
}

.exchange-shell {
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 44px;
}

.page-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.45fr);
  align-items: end;
  gap: 28px;
  margin-bottom: 34px;
}

.eyebrow,
.section-kicker {
  grid-column: 1 / -1;
  margin: 0 0 -10px;
  color: var(--brass);
  font-family: Consolas, monospace;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

h1 {
  margin: 0;
  font-family: "Bahnschrift SemiCondensed", "Microsoft YaHei", sans-serif;
  font-size: clamp(2.75rem, 7vw, 5.8rem);
  font-stretch: condensed;
  font-weight: 650;
  letter-spacing: -0.055em;
  line-height: 0.9;
}

.intro {
  max-width: 18em;
  margin: 0 0 8px;
  color: var(--ink-soft);
  font-size: 0.98rem;
  line-height: 1.75;
}

.quote-board {
  position: relative;
  overflow: hidden;
  padding: 26px 30px 23px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--white);
  box-shadow: var(--shadow);
}

.quote-board::after {
  position: absolute;
  top: 0;
  right: 25px;
  bottom: 0;
  width: 9px;
  content: "";
  opacity: 0.7;
  background: repeating-linear-gradient(
    to bottom,
    var(--brass-pale) 0,
    var(--brass-pale) 1px,
    transparent 1px,
    transparent 12px
  );
}

.quote-heading,
.quote-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.quote-heading p,
.quote-meta,
.rate-message {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.quote-heading p,
.quote-meta {
  color: #b7ccc8;
}

.mode-badge {
  padding: 5px 9px;
  border: 1px solid rgba(240, 223, 189, 0.45);
  color: var(--brass-pale);
  font-size: 0.72rem;
}

.mode-badge.manual {
  border-color: #efb1a7;
  color: #ffd1c9;
}

.rate-equation {
  display: grid;
  grid-template-columns: auto auto 1fr auto;
  align-items: baseline;
  gap: clamp(10px, 3vw, 30px);
  margin: 34px 46px 30px 0;
  font-family: "Bahnschrift SemiCondensed", Consolas, monospace;
  font-variant-numeric: tabular-nums;
}

.rate-number {
  color: var(--brass-pale);
  font-size: clamp(3.2rem, 9vw, 7.4rem);
  font-weight: 600;
  letter-spacing: -0.06em;
  line-height: 0.8;
  text-align: right;
}

.unit {
  font-size: clamp(0.9rem, 2.1vw, 1.2rem);
  font-weight: 600;
  letter-spacing: 0.03em;
}

.equals {
  color: var(--line);
  font-size: 1.3rem;
}

.quote-meta {
  justify-content: flex-start;
  gap: 28px;
}

.quote-meta strong {
  color: var(--white);
}

.rate-message {
  min-height: 1.4em;
  margin-top: 11px;
  color: #b7ccc8;
}

.rate-message.error,
.rate-message.stale {
  color: #ffc1b8;
}

.converter {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 72px minmax(0, 1fr);
  align-items: end;
  gap: 18px;
  padding: 34px 30px 38px;
  border: 1px solid var(--line);
  border-top: 0;
  background: rgba(251, 253, 252, 0.88);
}

.amount-field label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
  font-weight: 700;
}

.amount-field label small {
  color: var(--ink-soft);
  font-size: 0.68rem;
  font-weight: 400;
}

.input-frame {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 11px;
  padding: 8px 0 9px;
  border-bottom: 2px solid var(--ink);
}

.input-frame span {
  color: var(--brass);
  font-family: Georgia, serif;
  font-size: 1.35rem;
}

.input-frame input {
  width: 100%;
  min-width: 0;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-family: "Bahnschrift SemiCondensed", Consolas, monospace;
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  font-variant-numeric: tabular-nums;
  font-weight: 550;
}

.input-frame:focus-within {
  border-color: var(--brass);
}

.input-frame input::placeholder {
  color: #a9bbb7;
}

.exchange-axis {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 6px;
  padding-bottom: 18px;
  color: var(--brass);
}

.exchange-axis span {
  height: 1px;
  background: var(--line);
}

.exchange-axis b {
  font-size: 1.25rem;
}

.field-error {
  grid-column: 1 / -1;
  min-height: 1.3em;
  margin: 7px 0 -18px;
  color: var(--seal);
  font-size: 0.76rem;
}

.manual-panel {
  display: grid;
  grid-template-columns: minmax(190px, 0.55fr) minmax(0, 1fr);
  gap: 40px;
  margin-top: 24px;
  padding: 27px 30px 30px;
  border: 1px solid var(--line);
  background: var(--paper-deep);
}

.manual-panel h2 {
  margin: 7px 0 8px;
  font-family: "Bahnschrift SemiCondensed", "Microsoft YaHei", sans-serif;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.manual-panel p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.8rem;
  line-height: 1.65;
}

.manual-controls > label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.77rem;
  font-weight: 700;
}

.manual-row {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) auto auto;
  gap: 9px;
}

.manual-input {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  padding: 0 11px;
  border: 1px solid var(--line);
  background: var(--white);
}

.manual-input input {
  width: 100%;
  min-width: 0;
  padding: 10px 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-family: Consolas, monospace;
  font-variant-numeric: tabular-nums;
}

.manual-input span {
  flex: 0 0 auto;
  color: var(--ink-soft);
  font-family: Consolas, monospace;
  font-size: 0.67rem;
}

.button {
  min-height: 42px;
  padding: 0 15px;
  border: 1px solid var(--ink);
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 700;
  transition: transform 150ms ease, background-color 150ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--ink);
  color: var(--white);
}

.button-primary:hover {
  background: #1b424d;
}

.button-secondary {
  background: transparent;
  color: var(--ink);
}

.button-secondary:hover {
  background: rgba(251, 253, 252, 0.65);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  padding: 18px 2px 0;
  color: var(--ink-soft);
  font-size: 0.7rem;
  line-height: 1.6;
}

footer p {
  max-width: 40em;
  margin: 0;
}

@media (max-width: 760px) {
  .exchange-shell {
    width: min(100% - 24px, 600px);
    padding: 40px 0 30px;
  }

  .page-header {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-bottom: 24px;
  }

  .eyebrow {
    margin-bottom: -3px;
  }

  h1 {
    font-size: clamp(2.8rem, 15vw, 4.4rem);
  }

  .intro {
    max-width: none;
  }

  .quote-board {
    padding: 20px 18px;
  }

  .quote-board::after {
    right: 11px;
  }

  .quote-heading {
    align-items: flex-start;
  }

  .rate-equation {
    grid-template-columns: auto auto 1fr;
    gap: 9px;
    margin: 28px 22px 26px 0;
  }

  .rate-equation .unit:last-child {
    grid-column: 3;
    font-size: 0.75rem;
    text-align: right;
  }

  .rate-number {
    font-size: clamp(3.1rem, 18vw, 5rem);
  }

  .quote-meta {
    flex-wrap: wrap;
    gap: 7px 20px;
  }

  .converter {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 26px 18px 30px;
  }

  .exchange-axis {
    grid-template-columns: 1fr auto 1fr;
    padding: 0;
  }

  .exchange-axis b {
    transform: rotate(90deg);
  }

  .field-error {
    margin-bottom: -10px;
  }

  .manual-panel {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 23px 18px 27px;
  }

  .manual-row {
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  footer {
    flex-direction: column;
    gap: 7px;
  }
}

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