/* 부가세·VAT 계산기 전용 스타일 */

nav { max-width: 820px; }
main { max-width: 820px; }

.subtitle {
  color: var(--text-sub);
  margin-bottom: 1.25rem;
}

/* 모드 탭 */
.mode-tabs {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.mode-tab {
  flex: 1;
  min-width: 220px;
  padding: 0.65rem 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--surface);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
}

.mode-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.mode-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* 폼 */
.form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.field label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text);
}

.field input[type="text"], .field input[type="number"] {
  padding: 0.6rem 0.75rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 1.05rem;
  font-weight: 700;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  text-align: right;
  width: 100%;
  box-sizing: border-box;
}

.field input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}

.hint-line {
  font-size: 0.72rem;
  color: var(--text-sub);
  font-weight: 500;
  text-align: right;
  min-height: 1em;
}

.rate-field {
  gap: 0.3rem;
}

.rate-row {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex-wrap: wrap;
}

.rate-row input {
  flex: 0 0 80px;
  text-align: center !important;
  font-size: 1rem !important;
}

.rate-preset {
  padding: 0.5rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.rate-preset:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* 결과 그리드 */
.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
  margin-bottom: 1rem;
}

.rcell {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 0.95rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.rcell.highlight {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.06));
  border-color: var(--primary);
}

.rcell-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-sub);
}

.rcell-val {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.1;
}

.rcell.highlight .rcell-val {
  color: var(--primary);
}

.rcell-words {
  font-size: 0.72rem;
  color: var(--text-sub);
  font-weight: 500;
  min-height: 1em;
}

/* 액션 */
.action-row {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 1.5rem;
}

.btn-copy {
  padding: 0.55rem 1.2rem;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-copy:hover {
  filter: brightness(1.08);
}

/* 안내 박스 */
.info-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-sub);
  margin-bottom: 1.5rem;
}

.info-box strong {
  color: var(--text);
}

.info-box em {
  font-style: normal;
  font-weight: 700;
  color: var(--text);
}

@media (max-width: 700px) {
  .form { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; gap: 0.5rem; }
  .rcell-val { font-size: 1.25rem; }
  .mode-tab { min-width: 0; padding: 0.55rem 0.7rem; font-size: 0.8rem; }
}