/* =============================================
   전기 계산기 페이지 전용 스타일 (electric-calculator.css)
   — common.css 변수 활용
   ============================================= */

/* ===== 기본 레이아웃 ===== */
body {
  background: #FFFFFF;
  min-height: 100vh;
}

.calc-container {
  max-width: 870px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* ===== 상단 타이틀 영역 ===== */
.calc-header {
  text-align: center;
  margin-bottom: 1.2rem;
}

.calc-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.2rem;
}

.calc-header p {
  color: var(--text-sec);
  font-size: 1.125rem;
  margin: 0;
}

/* ===== 콘텐츠 그리드 ===== */
.calc-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .calc-content {
    grid-template-columns: 1fr 400px;
  }
}

/* 직접입력 활성화 시 데스크탑 가운데 정렬 */
@media (min-width: 768px) {
  body.direct-active .calc-content { grid-template-columns: 1fr; justify-items: center; }
  body.direct-active .input-section { max-width: 620px; width: 100%; margin: 0 auto; }
  body.direct-active .calc-content > div { max-width: 620px; width: 100%; margin: 0 auto; }
  body.direct-active .results-section { max-width: 620px; width: 100%; margin: 1.5rem auto 0; }
  body.direct-active .selected-items { display: none !important; }
}

/* ===== 입력 섹션 ===== */
.input-section {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text);
}

/* ===== 탭 메뉴 ===== */
.tab-menu {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-alt);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
}

.tab-btn {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-sec);
  font-weight: 600;
  font-size: 1.05rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.tab-btn.active {
  background: var(--accent);
  color: #FFFFFF;
}

/* ===== 탭 콘텐츠 ===== */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== 가전제품 선택 ===== */
.appliance-categories {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.category {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.category-header {
  padding: 0.75rem 1rem;
  background: var(--bg-alt);
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  color: var(--text);
}

.category-content {
  padding: 0.75rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.5rem;
  background: #FFFFFF;
}

.appliance-item {
  padding: 0.75rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.appliance-item:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.appliance-item.selected {
  background: var(--accent);
  border-color: var(--accent-hover);
  color: #FFFFFF;
}

.appliance-name {
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
  color: inherit;
}

.appliance-power {
  font-size: 0.75rem;
  color: var(--text-sec);
}

.appliance-item.selected .appliance-power {
  color: rgba(255, 255, 255, 0.9);
}

/* ===== 직접 입력 ===== */
.direct-input { display: grid; gap: 1rem; }
.input-group { display: grid; gap: 0.5rem; }
.input-label { font-weight: 600; color: var(--text); }
.input-wrapper { display: flex; gap: 0.5rem; }

.input-field {
  flex: 1;
  padding: 0.75rem 1rem;
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
}

.input-field:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.input-unit {
  padding: 0.75rem 1rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: var(--text-sec);
}

/* 단위 선택 셀렉트(W/kW) 글자 잘림 방지 */
#powerUnit {
  line-height: normal;
  padding: 0 1rem;
  vertical-align: middle;
  -webkit-appearance: menulist;
  appearance: menulist;
  box-sizing: border-box;
  height: 48px;
}

/* ===== 전압 선택 버튼 ===== */
.voltage-buttons {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-alt);
  padding: 0.25rem;
  border-radius: var(--radius-md);
}

.voltage-btn {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-sec);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.voltage-btn.active {
  background: var(--accent);
  color: #FFFFFF;
}

.voltage-btn:hover:not(.active) {
  background: var(--accent-light);
  color: var(--accent);
}

/* 직접입력: 입력칸과 단위 선택 동일 높이 통일 */
#direct-tab .input-wrapper .input-field { height: 48px; padding: 0.75rem 1rem; }

/* ===== 선택된 항목 ===== */
.selected-items {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: sticky;
  top: 5rem;
  box-shadow: var(--shadow);
}

.selected-list {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  max-height: none;
  overflow: visible;
}

.selected-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.item-info { display: grid; gap: 0.25rem; }
.item-name { font-weight: 600; color: var(--text); }
.item-details { font-size: 0.875rem; color: var(--text-sec); }

/* ===== 수량 조절 ===== */
.quantity-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.25rem;
}

.qty-btn {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-light);
  border: none; border-radius: 4px;
  color: var(--accent);
  cursor: pointer; font-weight: 600;
}

.qty-btn:hover { background: #DBEAFE; }

.qty-value {
  min-width: 32px;
  text-align: center;
  font-weight: 600;
  color: var(--text);
}

/* ===== 삭제 버튼 ===== */
.remove-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  background: #fee2e2; border: none; border-radius: 6px;
  color: #dc2626; cursor: pointer; font-size: 1.25rem;
}

.remove-btn:hover { background: #fecaca; }

/* ===== 계산 버튼 ===== */
.calc-button {
  width: 100%; padding: 1rem;
  background: var(--accent); border: none;
  border-radius: var(--radius-md);
  color: #FFFFFF; font-weight: 700; font-size: 1.125rem;
  cursor: pointer; transition: all 0.2s;
  text-decoration: none; display: block;
}

.calc-button.secondary { background: #e5e7eb; color: #111827; }
.calc-button.secondary:hover { background: #d1d5db; }

.action-buttons { display: flex; gap: .6rem; }
@media (max-width: 768px) { .action-buttons { flex-direction: column; } }

.calc-button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
}

/* ===== 결과 섹션 ===== */
.results-section {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 1.5rem;
  box-shadow: var(--shadow);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.result-card {
  padding: 1rem;
  background: var(--accent-light);
  border: 1px solid #DBEAFE;
  border-radius: var(--radius-md);
}

.result-label { font-size: 0.875rem; color: var(--text-sec); margin-bottom: 0.5rem; }
.result-value { font-size: 1.5rem; font-weight: 700; color: var(--accent); }
.result-unit { font-size: 1rem; color: var(--text-sec); margin-left: 0.25rem; }

/* ===== 결과 하단 안내 문구 ===== */
.results-notes { margin-top: 0.6rem; }
.results-notes p { margin: 0; color: #9ca3af; font-size: 0.875rem; word-break: keep-all; }
.br-appliance { display: inline; }
.br-direct { display: none; }
body.direct-active .br-appliance { display: none; }
body.direct-active .br-direct { display: inline; }
.results-notes p + p { margin-top: 0.28rem; }

/* 직접입력 모드 선택항목 숨김 */
body.direct-active .selected-items { display: none !important; }

/* ===== 사용 범위 초과 경고 ===== */
.range-warning {
  display: none;
  margin-top: 0.6rem;
  padding: 0.6rem 0.8rem;
  border-radius: 10px;
  background: #fee2e2;
  border: 1px solid #fecaca;
  color: #dc2626;
  font-weight: 700;
}

/* ===== 모바일 대응 ===== */
@media (max-width: 768px) {
  .calc-header h1 { font-size: 2rem; }
  .category-content { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .selected-items { position: static; margin-top: 2rem; }
  #direct-tab .input-wrapper .input-field { height: 48px; padding: 0.75rem 1rem; }
  #direct-tab #powerUnit { height: 48px; }
}

/* 데스크탑: 결과 표시 시 sticky 해제 */
@media (min-width: 768px) {
  body.has-results .selected-items { position: static; top: auto; }
}

/* ===== 카드 컴포넌트 (고급 계산기용) ===== */
.card { background:#fff; border-radius:var(--radius-lg); box-shadow:0 2px 14px rgba(0,0,0,.06); padding:1rem 1.2rem; margin:1rem 0; }
.card-title { margin:.2rem 0 .6rem 0; font-size:1.1rem; font-weight:700; color:#333; }
.card-desc { margin:0 0 .8rem 0; color:#555; line-height:1.45; }
.card.advanced summary { font-weight:700; cursor:pointer; margin-top:.4rem; }
.card.advanced .form-grid { margin-top:.6rem; }

/* ===== 폼 그리드 ===== */
.form-grid { display:grid; grid-template-columns:1fr; gap:.9rem; }
@media (min-width:640px){ .form-grid{ grid-template-columns:1fr 1fr; } }
.form-item { display:flex; flex-direction:column; gap:.35rem; }
.form-item .inline { display:flex; gap:.5rem; align-items:center; }
.form-item input, .form-item select { padding:.7rem .9rem; border:1.5px solid #cfd4e0; border-radius:10px; font-size:1rem; background:#fff; color:#333; }
.form-item.checkbox { flex-direction:row; align-items:center; gap:.5rem; }

/* ===== 프리셋 칩 ===== */
.preset-chips { display:flex; flex-wrap:wrap; gap:.4rem; margin-top:.4rem; }
.chip { border:1px solid #cfd4e0; background:var(--bg-alt); color:#334155; padding:.35rem .6rem; border-radius:999px; font-size:.85rem; cursor:pointer; }
.chip:hover { background:#eef2ff; border-color:#a5b4fc; }
.help-text { color:var(--text-sec); font-size:.85rem; }

/* ===== 액션/결과 (고급 계산기용) ===== */
.actions { display:flex; gap:.6rem; margin-top:.6rem; }
.results { display:grid; gap:.35rem; font-size:1rem; line-height:1.35; }
.results .row { display:flex; justify-content:space-between; gap:.75rem; padding:.55rem .7rem; background:#f7f9fb; border:1px solid #e6ebf2; border-radius:10px; }
.results .label { color:#334155; font-weight:600; }
.results .value { color:#111827; font-weight:700; }
.result-hint { color:#475569; font-size:.9rem; margin-top:.4rem; }

/* ===== 참고 테이블/링크 ===== */
.note { margin-top:.8rem; }
.note summary { cursor:pointer; font-weight:600; }
.ref-table { margin-top:.4rem; color:#334155; font-size:.92rem; }
.links { margin-top:.3rem; font-size:.9rem; }
.links a { color:#3b82f6; text-decoration:none; }
.links a:hover { text-decoration:underline; }