.page {
  flex: 1;
  max-width: 520px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tool {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.option-group { display: flex; flex-direction: column; gap: 8px; }

.option-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 14px;
  color: var(--ink);
  line-height: 1.4;
}
.radio-label input[type="radio"] { accent-color: var(--accent); width: 15px; height: 15px; cursor: pointer; }
.radio-sub { font-size: 12px; color: var(--muted); margin-left: 2px; }

.input-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.input-row input {
  flex: 1;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: "JetBrains Mono", monospace;
  font-size: 18px;
  font-weight: 500;
  background: var(--surface);
  color: var(--ink);
  transition: border-color 140ms, box-shadow 140ms;
  appearance: none;
  -moz-appearance: textfield;
}
.input-row input::-webkit-outer-spin-button,
.input-row input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.input-row input::placeholder { color: var(--muted); font-weight: 400; }
.input-row input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.unit {
  font-size: 15px;
  color: var(--muted);
  white-space: nowrap;
}

.result {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.result-row {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  gap: 12px;
}
.result-row + .result-row { border-top: 1px solid var(--border); }
.result-total {
  background: var(--accent-soft);
}
.result-label {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  min-width: 80px;
}
.result-tax .result-label,
.result-tax .result-value { color: var(--muted); }
.result-value {
  flex: 1;
  font-family: "JetBrains Mono", monospace;
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  text-align: right;
  letter-spacing: -0.01em;
}
.result-total .result-value {
  color: var(--accent-deep);
  font-size: 20px;
}

.custom-rate-input {
  display: none;
  width: 52px;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  font-weight: 500;
  background: var(--surface);
  color: var(--ink);
  transition: border-color 140ms;
  appearance: none;
  -moz-appearance: textfield;
  vertical-align: middle;
}
.custom-rate-input.visible { display: inline-block; }
.custom-rate-input::-webkit-outer-spin-button,
.custom-rate-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.custom-rate-input::placeholder { color: var(--muted); font-weight: 400; }
.custom-rate-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.unit-inline { display: none; font-size: 13px; color: var(--muted); }
.unit-inline.visible { display: inline; }

.copy-btn {
  appearance: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  padding: 4px;
  border-radius: 4px;
  display: grid;
  place-items: center;
  transition: color 120ms, background 120ms;
  flex-shrink: 0;
}
.copy-btn:hover { color: var(--accent); background: var(--accent-soft); }