/* CSS 변수 정의 */
.world-meeting-time-calculator {
  --bg-primary: #f5f5f0;
  --bg-secondary: #fff;
  --border-color: #333;
  --text-primary: #222;
  --text-secondary: #555;
  --text-light: #666;
  --color-primary: #3498db;
  --color-success: #27ae60;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --shadow-sm: 2px 2px 0 rgba(0,0,0,0.1);
  --shadow-md: 4px 4px 0 rgba(0,0,0,0.15);
  --shadow-lg: 8px 8px 0 rgba(0,0,0,0.15);
}

/* 전역 box-sizing */
.world-meeting-time-calculator,
.world-meeting-time-calculator *,
.world-meeting-time-calculator *::before,
.world-meeting-time-calculator *::after {
  box-sizing: border-box;
}

/* 메인 컨테이너 */
.meeting-calculator-container {
  max-width: 1180px;
  width: 100%;
  margin: 20px auto;
  padding: 15px;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  font-family: 'Noto Sans KR', 'Malgun Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  line-height: 1.5;
}

/* 헤더 */
.calculator-header {
  text-align: center;
  margin-bottom: 15px;
  padding-bottom: 12px;
  border-bottom: 3px double var(--border-color);
}

.calculator-header h2 {
  margin: 0 0 6px 0;
  font-size: 28px;
  font-weight: 700;
  color: #2c3e50;
  text-shadow: 2px 2px 0 rgba(255,255,255,0.5);
  line-height: 1.2;
}

.subtitle {
  margin: 0;
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.4;
}

/* 광고 섹션 */
.ad-section {
  display: block;
  width: 100%;
  min-height: 100px;
  padding: 12px;
  text-align: center;
  background: #fff;
  border: 1px solid #ddd;
  overflow: visible;
  margin-bottom: 15px;
}

.ad-label {
  display: block;
  font-size: 12px;
  color: #999;
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.ad-section .adsbygoogle {
  display: block;
  width: 100%;
  max-width: 100%;
  min-height: 90px;
  text-align: center;
}

/* 섹션 공통 */
.current-time-section,
.favorite-section,
.all-timezones-section,
.meeting-planner-section,
.info-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 12px;
  box-shadow: var(--shadow-md);
  margin-bottom: 15px;
}

/* 섹션 타이틀 */
.section-title {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 12px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  font-size: 18px;
  font-weight: 700;
  color: #2c3e50;
  line-height: 1.2;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 10px;
}

.section-description {
  margin: 0 0 12px 0;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.subsection-title {
  margin: 0 0 10px 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

/* 현재 시간 표시 */
.time-display-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.time-card {
  padding: 15px;
  background: #f9f9f9;
  border: 1px solid var(--border-color);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.time-card.local-time {
  border-left: 4px solid var(--color-primary);
}

.time-card.utc-time {
  border-left: 4px solid var(--color-success);
}

.time-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 600;
}

.time-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 6px 0;
  font-family: 'Courier New', monospace;
}

.date-value {
  font-size: 15px;
  color: var(--text-secondary);
  margin: 4px 0;
}

.location-name {
  font-size: 15px;
  color: var(--text-primary);
  font-weight: 600;
  margin-top: 6px;
}

/* 검색 박스 */
.search-box {
  position: relative;
  width: 260px;
  max-width: 100%;
}

.search-box svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
}

.search-box input {
  width: 100%;
  padding: 8px 12px 8px 35px;
  border: 1px solid var(--border-color);
  background: #fff;
  font-size: 15px;
  color: var(--text-primary);
  font-family: inherit;
}

.search-box input:focus {
  outline: 2px solid var(--color-warning);
  outline-offset: 2px;
  background: #fffacd;
}

/* 필터 버튼 */
.filter-buttons {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 16px;
  background: #fff;
  border: 1px solid var(--border-color);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.1);
  font-family: inherit;
}

.filter-btn:hover {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 rgba(0,0,0,0.1);
}

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

.filter-btn:focus-visible {
  outline: 2px solid var(--color-warning);
  outline-offset: 2px;
}

/* 시간대 그리드 */
.timezone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

/* 시간대 카드 */
.timezone-card {
  padding: 12px;
  background: #f9f9f9;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}

.timezone-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(0,0,0,0.2);
}

.timezone-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.timezone-location {
  display: flex;
  align-items: center;
  gap: 6px;
}

.timezone-flag {
  font-size: 20px;
}

.timezone-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.timezone-offset {
  font-size: 13px;
  color: var(--text-secondary);
  background: #e0e0e0;
  padding: 3px 8px;
  border: 1px solid var(--border-color);
}

.timezone-time {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 6px 0;
  font-family: 'Courier New', monospace;
}

.timezone-date {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 4px 0;
}

.timezone-status {
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border: 1px solid var(--border-color);
}

.status-working {
  background: var(--color-success);
}

.status-sleeping {
  background: var(--color-danger);
}

.status-text {
  color: var(--text-secondary);
}

/* 즐겨찾기 버튼 */
.btn-star {
  padding: 4px 8px;
  background: #fff;
  border: 1px solid var(--border-color);
  font-size: 16px;
  color: #ddd;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.btn-star:hover {
  color: var(--color-warning);
}

.btn-star.active {
  color: var(--color-warning);
  background: #fff8e6;
}

.btn-star:focus-visible {
  outline: 2px solid var(--color-warning);
  outline-offset: 2px;
}

/* 회의 계획 그리드 */
.planner-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
  margin-bottom: 15px;
}

.planner-section {
  padding: 12px;
  background: #f9f9f9;
  border: 1px solid var(--border-color);
}

/* 참가자 목록 */
#participants-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}

.participant-item {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: 8px;
  align-items: center;
}

.participant-label {
  padding: 8px;
  background: var(--color-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  border: 1px solid var(--border-color);
}

.participant-item.primary .participant-label {
  background: var(--color-success);
}

/* 입력 그룹 */
.input-group {
  margin-bottom: 10px;
}

.input-group label {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
}

.input-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.timezone-select,
input[type="date"],
input[type="time"],
select {
  width: 100%;
  max-width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border-color);
  background: #fff;
  font-size: 15px;
  color: var(--text-primary);
  font-family: inherit;
}

.timezone-select:focus,
input[type="date"]:focus,
input[type="time"]:focus,
select:focus {
  outline: 2px solid var(--color-warning);
  outline-offset: 2px;
  background: #fffacd;
}

/* 체크박스 그룹 */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.checkbox-group label {
  font-size: 15px;
  color: var(--text-primary);
  cursor: pointer;
}

/* 버튼 */
.btn-add,
.btn-primary,
.btn-remove {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 16px;
  border: 1px solid var(--border-color);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 3px 3px 0 rgba(0,0,0,0.2);
  font-family: inherit;
}

.btn-add {
  width: 100%;
  background: #fff;
  color: var(--text-primary);
}

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

.btn-remove {
  padding: 6px 10px;
  background: var(--color-danger);
  color: #fff;
}

.btn-add:hover,
.btn-primary:hover,
.btn-remove:hover {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(0,0,0,0.2);
}

.btn-add:active,
.btn-primary:active,
.btn-remove:active {
  transform: translate(3px, 3px);
  box-shadow: none;
}

.btn-add:focus-visible,
.btn-primary:focus-visible,
.btn-remove:focus-visible {
  outline: 3px solid var(--color-warning);
  outline-offset: 2px;
}

/* 회의 시간 결과 */
.results-section {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 2px dashed #ddd;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.results-info {
  font-size: 15px;
  color: var(--text-secondary);
}

.result-count {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 18px;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  min-height: 150px;
}

.empty-message {
  grid-column: 1 / -1;
  text-align: center;
  padding: 30px 20px;
  color: var(--text-secondary);
  font-size: 15px;
  background: #f9f9f9;
  border: 2px dashed #ddd;
}

/* 회의 시간 카드 */
.meeting-time-card {
  background: #fff;
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}

.meeting-time-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(0,0,0,0.2);
}

.meeting-time-header {
  padding: 10px 12px;
  background: #f9f9f9;
  border-bottom: 1px solid var(--border-color);
}

.meeting-time-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 6px 0;
  font-family: 'Courier New', monospace;
}

.meeting-score {
  display: flex;
  align-items: center;
  gap: 8px;
}

.score-label {
  font-size: 14px;
  color: var(--text-secondary);
}

.score-bar {
  flex: 1;
  height: 6px;
  background: #e0e0e0;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.score-value {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-success));
}

.meeting-time-body {
  padding: 12px;
}

.participants-times {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.participant-time-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.participant-info {
  display: flex;
  align-items: center;
  gap: 6px;
}

.participant-name {
  font-size: 15px;
  color: var(--text-secondary);
}

.participant-local-time {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
}

.time-status {
  font-size: 13px;
  padding: 3px 8px;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.time-business {
  background: #d4edda;
  color: var(--color-success);
}

.time-non-business {
  background: #f8d7da;
  color: var(--color-danger);
}

/* 정보 섹션 */
.info-content {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.info-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 15px;
}

.info-card {
  padding: 12px;
  background: #f9f9f9;
  border: 1px solid #ddd;
  text-align: center;
}

.info-icon {
  font-size: 28px;
  margin-bottom: 6px;
}

.info-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.info-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.warning-box {
  padding: 12px;
  background: #fff8e6;
  border: 1px solid var(--color-warning);
  border-left: 4px solid var(--color-warning);
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.5;
}

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

/* 반응형: 태블릿 */
@media (max-width: 1024px) {
  .planner-grid {
    grid-template-columns: 1fr;
  }
  
  .info-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 반응형: 모바일 */
@media (max-width: 768px) {
  .meeting-calculator-container {
    margin: 8px 5px;
    padding: 10px;
    width: calc(100% - 10px);
    max-width: 100%;
  }
  
  .calculator-header h2 {
    font-size: 24px;
  }
  
  .subtitle {
    font-size: 14px;
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .search-box {
    width: 100%;
  }
  
  .filter-buttons {
    overflow-x: auto;
    flex-wrap: nowrap;
  }
  
  .filter-btn {
    flex-shrink: 0;
  }
  
  .time-display-grid {
    grid-template-columns: 1fr;
  }
  
  .timezone-grid {
    grid-template-columns: 1fr;
  }
  
  .info-cards {
    grid-template-columns: 1fr;
  }
  
  .input-row {
    grid-template-columns: 1fr;
  }
  
  .results-grid {
    grid-template-columns: 1fr;
  }
}

/* 반응형: 작은 모바일 */
@media (max-width: 480px) {
  .meeting-calculator-container {
    margin: 8px 5px;
    padding: 8px;
    width: calc(100% - 10px);
    border-width: 1px;
  }
  
  .calculator-header h2 {
    font-size: 22px;
  }
  
  .time-value {
    font-size: 24px;
  }
  
  .participant-item {
    grid-template-columns: 50px 1fr auto;
  }
}