/* ===================== 다크모드 토글 버튼 ===================== */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-card);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.icon {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===================== 탭 (계산 방향 전환) ===================== */
.calc-tab {
  display: flex;
  background: var(--color-card-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-button);
  padding: 4px;
  margin-bottom: var(--space-4);
}

.calc-tab__btn {
  flex: 1;
  border: none;
  background: transparent;
  padding: 11px 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-radius: calc(var(--radius-button) - 4px);
  cursor: pointer;
  font-family: var(--font-body);
  transition: background-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
  min-height: 44px;
  min-width: 0;
  white-space: normal;
  word-break: keep-all;
  line-height: 1.3;
}

.calc-tab__btn.is-active {
  background: var(--color-card);
  color: var(--color-primary);
  box-shadow: 0 1px 2px rgba(17, 24, 39, 0.08);
}

/* ===================== 입력 필드 ===================== */
.calc-field__label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.calc-field__control {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-input);
  background: var(--color-card);
  padding: 0 6px 0 var(--space-3);
  transition: border-color var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-fast) var(--ease-standard);
}

.calc-field__control:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.calc-field__won {
  color: var(--color-text-muted);
  font-size: 1.3rem;
  margin-right: 4px;
}

.calc-field__input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 22px;
  font-weight: 600;
  padding: 16px 4px;
  color: var(--color-text-primary);
  min-width: 0;
  height: 56px;
  font-family: var(--font-body);
}

.calc-field__input:focus { outline: none; }
.calc-field__input::placeholder { color: #9CA3AF; font-weight: 400; }

.calc-field__clear {
  border: none;
  background: none;
  font-size: 1.1rem;
  color: var(--color-text-muted);
  width: 32px;
  height: 32px;
  min-width: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: none;
}

.calc-field__control.has-value .calc-field__clear { display: block; }

.calc-field__error {
  color: var(--color-error);
  font-size: var(--fs-caption);
  margin: var(--space-2) 2px 0;
}

.calc-field__control.has-error {
  border-color: var(--color-error);
  border-width: 2px;
}

/* ===================== 결과: Result Box ===================== */
.result-box__title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-3);
}

.result-box {
  width: 100%;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-4);
}

.result-box__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  row-gap: 2px;
  font-size: var(--fs-result-line);
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: var(--space-1) 0;
}

.result-box__row > span:first-child {
  flex-shrink: 0;
  white-space: nowrap;
}

.result-box__num {
  white-space: nowrap;
  margin-left: auto;
}

.result-box__row em {
  font-style: normal;
  font-size: 0.78em;
  font-weight: 400;
  opacity: 0.85;
}

.result-box__rule {
  border-top: 1px solid var(--color-border);
  margin: var(--space-2) 0;
}

.result-box__row--total {
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--fs-result-total);
  padding-top: var(--space-1);
}

.result-box__num--total {
  color: var(--color-primary);
  font-size: var(--fs-result-total);
}

@media (max-width: 380px) {
  .result-box__num--total { font-size: 24px; }
}

.result-box__num .unit {
  font-size: 0.6em;
  font-weight: 400;
  margin-left: 1px;
}

/* 결과 값이 갱신될 때 합계금액에 은은한 하이라이트 페이드 */
.result-box__row--total.is-updated {
  animation: totalFlash var(--duration-base) var(--ease-standard);
}

@keyframes totalFlash {
  0% { background-color: var(--color-primary-soft); }
  100% { background-color: transparent; }
}

/* ===================== 버튼 ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--fs-button);
  font-weight: 600;
  border-radius: var(--radius-button);
  border: none;
  cursor: pointer;
  min-height: 48px;
  padding: 0 20px;
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  width: 100%;
  margin-top: var(--space-4);
}

.btn--primary:hover { background: var(--color-primary-hover); }
.btn--primary:active { background: var(--color-primary-hover); }
.btn--primary:disabled {
  background: var(--color-border);
  color: #9CA3AF;
  cursor: not-allowed;
}
.btn--primary .icon { width: 16px; height: 16px; }

.btn--ghost {
  background: var(--color-card);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover { background: var(--color-card-alt); }

.btn--sm { min-height: 40px; font-size: 0.8rem; padding: 0 14px; }

#copyStatus {
  min-height: 1.2em;
  margin: var(--space-2) 0 0;
  color: var(--color-success);
  font-weight: 600;
  font-size: var(--fs-caption);
}

/* ===================== 계산 과정 토글 / Alert 스타일 ===================== */
.detail-toggle__btn {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  padding: var(--space-2) 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.detail-toggle__chevron {
  display: inline-block;
  transition: transform var(--duration-fast) var(--ease-standard);
  color: var(--color-text-muted);
}

.detail-toggle__btn[aria-expanded="true"] .detail-toggle__chevron {
  transform: rotate(90deg);
}

.detail-toggle__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-base) var(--ease-standard);
  padding: 0 4px;
}

/* Alert: 계산식 / 안내 문구는 Primary 톤의 Alert 박스로 표현 */
.alert {
  background: var(--color-primary-soft);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-alert);
  padding: var(--space-3);
  margin-top: var(--space-2);
  color: var(--color-text-primary);
  font-size: 0.9rem;
}

/* ===================== 최근 계산 기록 ===================== */
.history-list {
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.history-list__item {
  width: 100%;
  text-align: left;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-alert);
  padding: var(--space-3);
  font-size: 0.85rem;
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: border-color var(--duration-fast) var(--ease-standard);
}

.history-list__item:hover { border-color: var(--color-primary); }
.history-list__meta { color: var(--color-text-muted); font-size: 0.72rem; }

/* ===================== 비교 표 ===================== */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-3) 0 var(--space-4);
  font-size: 0.9rem;
}

.compare-table th, .compare-table td {
  border: 1px solid var(--color-border);
  padding: 10px 12px;
  text-align: left;
}

.compare-table th {
  background: var(--color-card-alt);
  font-weight: 600;
  color: var(--color-text-primary);
}

.compare-table td { color: var(--color-text-secondary); }

/* ===================== 계산 예시 카드 ===================== */
.example-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-3) var(--space-4);
}

.example-card p { margin: 0 0 4px; font-size: 0.9rem; color: var(--color-text-secondary); }

.example-card__num {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
}

.example-card__total {
  font-weight: 700;
  color: var(--color-primary) !important;
  margin-top: var(--space-2) !important;
}

/* ===================== 실수 사례 리스트 ===================== */
.tip-list { padding-left: 20px; margin: 0 0 var(--space-4); }
.tip-list li { margin-bottom: var(--space-3); color: var(--color-text-secondary); }
.tip-list li strong { color: var(--color-text-primary); }

/* ===================== FAQ 아코디언 ===================== */
.accordion__item { border-bottom: 1px solid var(--color-border); }

.accordion__btn {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: var(--space-3) 4px;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--color-text-primary);
  cursor: pointer;
  position: relative;
  padding-right: 24px;
  font-family: var(--font-body);
}

.accordion__btn::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 14px;
  font-size: 1.2rem;
  color: var(--color-text-muted);
  transition: transform var(--duration-fast) var(--ease-standard);
}

.accordion__btn[aria-expanded="true"]::after { transform: rotate(45deg); }

.accordion__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-base) var(--ease-standard);
}

.accordion__body p {
  padding: 0 4px var(--space-3);
  color: var(--color-text-secondary);
  font-size: 0.92rem;
}