:root {
  --page: #f6f8fb;
  --panel: #ffffff;
  --text: #18181b;
  --muted: #5f6b7a;
  --line: #d9e1ea;
  --input: #f9fbfd;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --warn: #be123c;
  --warn-bg: #fff1f4;
  --gold: #d9a441;
  --focus: 0 0 0 3px rgba(15, 118, 110, 0.22);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--page);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: var(--accent-strong);
}

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

.converter {
  width: min(100%, 520px);
  display: grid;
  gap: 16px;
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 55px rgba(24, 24, 27, 0.12);
}

.mast {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mark {
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
}

h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: 0;
}

.mast p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.control {
  display: grid;
  gap: 7px;
}

label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
}

input,
select {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--input);
  color: var(--text);
  font: inherit;
  outline: none;
}

input {
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%),
    linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position:
    calc(100% - 17px) 50%,
    calc(100% - 11px) 50%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 34px;
}

input:focus-visible,
select:focus-visible,
button:focus-visible {
  border-color: var(--accent);
  box-shadow: var(--focus);
}

select[disabled],
button[disabled] {
  cursor: not-allowed;
  opacity: 0.55;
}

.pair-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 46px minmax(0, 1fr);
  align-items: end;
  gap: 10px;
}

.swap {
  width: 46px;
  height: 46px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf6;
  color: var(--accent);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, transform 0.2s ease;
}

.swap:hover:not([disabled]) {
  border-color: var(--gold);
  color: var(--accent-strong);
}

.swap:active:not([disabled]) {
  transform: rotate(180deg);
}

.result {
  min-height: 104px;
  display: grid;
  place-items: center;
  gap: 4px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f3fbf8;
  text-align: center;
}

.result-value {
  max-width: 100%;
  color: var(--text);
  font-size: 34px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.result-rate {
  min-height: 1.4em;
  color: var(--muted);
  font-size: 14px;
}

.error {
  margin: 0;
  padding: 10px 12px;
  border: 1px solid var(--warn);
  border-radius: 8px;
  background: var(--warn-bg);
  color: var(--warn);
  font-size: 14px;
}

.foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.converter[aria-busy="true"] .result-value {
  opacity: 0.55;
}

.privacy-shell {
  align-items: start;
}

.privacy {
  width: min(100%, 760px);
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 55px rgba(24, 24, 27, 0.12);
}

.privacy h1 {
  margin-top: 12px;
}

.privacy code {
  padding: 2px 5px;
  border-radius: 6px;
  background: var(--input);
}

.back-link {
  font-size: 14px;
  font-weight: 700;
}

@media (max-width: 620px) {
  .shell {
    min-height: 100svh;
    padding: 14px;
    place-items: start center;
  }

  .converter,
  .privacy {
    padding: 18px;
  }

  .mast {
    align-items: flex-start;
  }

  h1 {
    font-size: 25px;
  }

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

  .swap {
    width: 100%;
  }

  .result-value {
    font-size: 30px;
  }

  .foot {
    flex-direction: column;
  }
}