/* ============================================================
   날짜 계산기 전용 스타일
   - 이 도구의 디자인 컨셉: "책상 위 계산 메모지"
     탭으로 두 계산(두 날짜 사이 / N일 후·전)을 오가고,
     왼쪽에 조건을 적으면 오른쪽 메모지에 답이 줄줄이 적힌다.
   - 색상·간격 등 공통 토큰은 common.css 재사용
   ============================================================ */

/* ---- 도입부 (다른 도구와 같은 골격) ---- */
.tool-intro {
  padding: var(--space-6) 0 var(--space-5);
  margin-bottom: var(--space-5);
}
.tool-intro h1 {
  margin: 0 0 var(--space-3);
  max-width: 20ch;
  font-size: clamp(2.1rem, 5vw, 3.1rem);
  line-height: 1.18;
  letter-spacing: -.02em;
}
.lead {
  color: var(--color-text-sub);
  margin: var(--space-2) 0 var(--space-2);
  max-width: 60ch;
  font-size: 1.02rem;
}
.lead-note {
  color: var(--color-text-sub);
  font-size: .85rem;
  opacity: .85;
  margin: 0 0 var(--space-5);
}

/* ---- 모드 탭 ---- */
.dc-tabs {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  margin-bottom: var(--space-4);
}
.dc-tab {
  font: inherit;
  font-size: .95rem;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
  border: 0;
  border-radius: 999px;
  padding: 10px 20px;
  background: transparent;
  color: var(--color-text-sub);
}
.dc-tab:not([aria-selected="true"]):hover { color: var(--color-text); }
.dc-tab[aria-selected="true"] {
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
}

/* ---- 입력 | 결과 2단 ---- */
.dc-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--space-4);
  align-items: start;
}
@media (max-width: 860px) {
  .dc-grid { grid-template-columns: 1fr; }
}

/* ---- 입력 카드 ---- */
.dc-form { display: flex; flex-direction: column; gap: var(--space-4); }
.dc-field { display: flex; flex-direction: column; gap: var(--space-2); }
.dc-label { font-weight: 700; font-size: .95rem; }
.dc-label small { font-weight: 400; color: var(--color-text-sub); }
.dc-field input[type="date"] {
  font: inherit;
  font-size: 1.02rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px var(--space-3);
  outline: 0;
  width: 100%;
  min-height: 44px;
  -webkit-appearance: none;
  appearance: none;
}
.dc-field input[type="date"]:focus { border-color: var(--color-primary); }

/* 숫자 입력 + 단위 */
.dc-input-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  padding: 0 var(--space-3);
}
.dc-input-wrap:focus-within { border-color: var(--color-primary); }
.dc-input-wrap input {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: 1.05rem;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--color-text);
  padding: 10px 0;
  font-variant-numeric: tabular-nums;
}
.dc-input-wrap input::-webkit-outer-spin-button,
.dc-input-wrap input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.dc-input-wrap input[type="number"] { -moz-appearance: textfield; appearance: textfield; }
.dc-unit { color: var(--color-text-sub); font-size: .9rem; flex: none; }

/* 방향 세그먼트 */
.dc-seg {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg);
  align-self: flex-start;
}
.dc-seg-btn {
  font: inherit;
  font-size: .88rem;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
  border: 0;
  border-radius: 999px;
  padding: 8px 18px;
  background: transparent;
  color: var(--color-text-sub);
}
.dc-seg-btn:not([aria-pressed="true"]):hover { color: var(--color-text); }
.dc-seg-btn[aria-pressed="true"] {
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
}

/* 체크박스 */
.dc-check {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-size: .92rem;
  cursor: pointer;
}
.dc-check input { accent-color: var(--color-primary); }
.dc-check small { color: var(--color-text-sub); }

/* 칩 */
.dc-chips { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.dc-chip {
  font: inherit;
  font-size: .85rem;
  cursor: pointer;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text);
  padding: 6px 14px;
  font-variant-numeric: tabular-nums;
}
.dc-chip:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* 바꾸기 버튼 줄 */
.dc-swap-row { display: flex; justify-content: center; margin: calc(var(--space-2) * -1) 0; }
.dc-swap { font-size: .82rem; padding: 4px 12px; }

.dc-form-note {
  margin: 0;
  font-size: .8rem;
  color: var(--color-text-sub);
}

/* ---- 결과 카드 ---- */
.dc-report { min-height: 320px; }

.dc-idle {
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.dc-idle-hint {
  margin: 0;
  text-align: center;
  color: var(--color-text-sub);
  font-size: .95rem;
  line-height: 1.7;
}

.dc-big {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 5.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  word-break: keep-all;
}
.dc-sub {
  margin: var(--space-2) 0 var(--space-4);
  color: var(--color-text-sub);
  font-size: .95rem;
}

/* 상세 행 (메모지 줄) */
.dc-rows { border-top: 1px dashed var(--color-border); }
.dc-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px dashed var(--color-border);
  flex-wrap: wrap;
}
.dc-row-label {
  flex: none;
  width: 8.5em;
  font-size: .88rem;
  font-weight: 700;
}
.dc-row-value {
  font-variant-numeric: tabular-nums;
  font-size: .98rem;
}
.dc-row-value b { font-size: 1.06rem; }
.dc-row-note {
  flex-basis: 100%;
  margin: 2px 0 0 calc(8.5em + var(--space-3));
  font-size: .8rem;
  color: var(--color-text-sub);
}
@media (max-width: 480px) {
  .dc-row-label { width: 100%; }
  .dc-row-note { margin-left: 0; }
}

.dc-result-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
}
.dc-btn-ghost { background: transparent; }

/* ---- 본문 표 ---- */
.dc-table-wrap { overflow-x: auto; }
.dc-table {
  border-collapse: collapse;
  width: 100%;
  font-size: .92rem;
  margin: var(--space-3) 0;
}
.dc-table th, .dc-table td {
  border: 1px solid var(--color-border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
.dc-table th { background: var(--color-bg); font-size: .85rem; }
.dc-table td { font-variant-numeric: tabular-nums; }

/* ---- 본문 프로즈(다른 도구와 같은 골격) ---- */
.prose { max-width: 760px; margin: var(--space-6) auto 0; }
.prose h2 { margin: 0 0 var(--space-3); }
.prose h3 { margin: var(--space-5) 0 var(--space-2); font-size: 1.1rem; }
.prose p, .prose li { color: var(--color-text); font-size: .95rem; line-height: 1.8; }
.prose ol, .prose ul { padding-left: 1.3em; }
.prose li { margin-bottom: var(--space-2); }
.prose details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-2);
}
.prose summary { cursor: pointer; font-weight: 700; font-size: .95rem; }
.prose details p { margin: var(--space-3) 0 var(--space-1); }