:root {
  color-scheme: dark;
  --bg: #1b1b1b;
  --panel: #242424;
  --text: #f2f2f2;
  --muted: #b7b7b7;
  --border: #3a3a3a;
  --focus: #7aa8ff;
  --danger: #ff6b6b;
  --ok: #6ee7b7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
}

.app {
  width: min(720px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
}

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.auth {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: rgba(0, 0, 0, 0.12);
  margin-bottom: 14px;
  display: grid;
  gap: 10px;
}

.authRow {
  display: grid;
  gap: 10px;
}

@media (min-width: 680px) {
  .authRow {
    grid-template-columns: 1fr auto;
    align-items: end;
    gap: 12px;
  }
}

.authFields {
  display: grid;
  gap: 12px;
}

@media (min-width: 680px) {
  .authFields {
    grid-template-columns: 1fr 1fr;
  }
}

.authActions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.authMeta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: baseline;
  color: var(--muted);
  font-size: 13px;
}

.authState {
  color: var(--text);
}

.authNote {
  color: var(--muted);
}

h1 {
  font-size: 20px;
  line-height: 1.2;
  margin: 0;
}

.hint {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 680px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.field {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.03);
}

input {
  appearance: none;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 12px 12px;
  font-size: 16px;
  outline: none;
}

input::placeholder {
  color: #8f8f8f;
}

.suffix {
  display: grid;
  place-items: center;
  padding: 0 10px;
  color: var(--muted);
  border-left: 1px solid var(--border);
  font-size: 13px;
  user-select: none;
  white-space: nowrap;
}

.field:focus-within {
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(122, 168, 255, 0.16);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

button {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 14px;
}

button:hover {
  background: rgba(255, 255, 255, 0.09);
}

#logIn,
#logOut,
#clearSaved {
  background: transparent;
}

#logIn:hover,
#logOut:hover,
#clearSaved:hover {
  background: transparent;
}

#calc {
  background: rgba(34, 197, 94, 0.22);
  border-color: rgba(34, 197, 94, 0.55);
}

#calc:hover {
  background: rgba(34, 197, 94, 0.3);
  border-color: rgba(34, 197, 94, 0.7);
}

button:focus-visible {
  outline: 3px solid rgba(122, 168, 255, 0.45);
  outline-offset: 2px;
}

.results {
  margin-top: 18px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.18);
  display: grid;
  gap: 8px;
}

.resultRow {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.resultRow span:first-child {
  color: var(--muted);
}

.value {
  font-variant-numeric: tabular-nums;
}

.cost {
  font-size: 20px;
  font-weight: 700;
}

.status {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
  min-height: 1.2em;
}

.status.error {
  color: var(--danger);
}

.status.ok {
  color: var(--ok);
}

.kbd {
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 12px;
}