/* ===== 탭 네비게이션 ===== */
.region-tabs {
  display: flex;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xs);
  margin-bottom: var(--spacing-xl);
  gap: var(--spacing-xs);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab-button {
  background: none;
  border: none;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 500;
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 0;
}

.tab-button:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.tab-button.active {
  background-color: var(--primary-color);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.tab-button:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* ===== 탭 패널 ===== */
.tab-panels {
  position: relative;
  min-height: 300px;
}

.tab-panel {
  opacity: 0;
  visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  transition: all var(--transition-normal);
  transform: translateY(10px);
}

.tab-panel.active {
  opacity: 1;
  visibility: visible;
  position: relative;
  transform: translateY(0);
}

/* ===== 호선 그리드 ===== */
.line-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

@media (max-width: 768px) {
  .line-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .line-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xs);
  }
}

/* ===== 호선 버튼 ===== */
.line-btn {
  background: white;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  width: 100%;
  font-size: var(--font-size-base);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  color: var(--text-primary) !important;
}

.line-btn:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.line-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.line-btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* 호선별 원형 숫자 배지 색상 */
.line-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: white;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

/* 서울 지하철 */
.line-btn[data-line="1"] .line-badge { background: #0052a4; }
.line-btn[data-line="2"] .line-badge { background: #00a84d; }
.line-btn[data-line="3"] .line-badge { background: #ef7c1c; }
.line-btn[data-line="4"] .line-badge { background: #00a4e3; }
.line-btn[data-line="5"] .line-badge { background: #996cac; }
.line-btn[data-line="6"] .line-badge { background: #cd7f00; }
.line-btn[data-line="7"] .line-badge { background: #747f00; }
.line-btn[data-line="8"] .line-badge { background: #e6186c; }
.line-btn[data-line="9"] .line-badge { background: #bdb092; }

/* 부산지하철 */
.line-btn[data-region="busan"][data-line="1"] .line-badge { background: #f06a00; }
.line-btn[data-region="busan"][data-line="2"] .line-badge { background: #81c562; }
.line-btn[data-region="busan"][data-line="3"] .line-badge { background: #fabe00; }
.line-btn[data-region="busan"][data-line="4"] .line-badge { background: #1e90ff; }

/* 서울 특수 노선 */
.line-btn[data-line="airport"] .line-badge { background: #0090d2; }
.line-btn[data-line="bundang"] .line-badge { background: #d4003b; }
.line-btn[data-line="gyeongui"] .line-badge { background: #77c4a3; }
.line-btn[data-line="uisinseol"] .line-badge { background: #b0ce18; }
.line-btn[data-line="suinbundang"] .line-badge { background: #fabe00; }

/* 대전지하철 */
.line-btn[data-region="daejeon"][data-line="1"] .line-badge { background: #007448; }

/* 대구지하철 */
.line-btn[data-region="daegu"][data-line="1"] .line-badge { background: #d93f00; }
.line-btn[data-region="daegu"][data-line="2"] .line-badge { background: #00a84d; }
.line-btn[data-region="daegu"][data-line="3"] .line-badge { background: #ffb100; }

/* 광주지하철 */
.line-btn[data-region="gwangju"][data-line="1"] .line-badge { background: #009639; }

/* 인천지하철 */
.line-btn[data-region="incheon"][data-line="1"] .line-badge { background: #759cce; }
.line-btn[data-region="incheon"][data-line="2"] .line-badge { background: #f5a251; }

.line-info {
  flex: 1;
  min-width: 0; /* flexbox overflow 방지 */
}

.line-number {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary) !important;
  margin-bottom: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.line-icon {
  font-size: var(--font-size-lg);
}

.line-operator {
  font-size: var(--font-size-sm);
  color: var(--text-secondary) !important;
  margin-bottom: var(--spacing-xs);
}

.line-phone {
  font-size: var(--font-size-sm);
  color: var(--text-muted) !important;
  font-family: 'Courier New', monospace;
}

.line-btn:hover .line-badge {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ===== 빈 상태 ===== */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.empty-state-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.empty-state-description {
  font-size: var(--font-size-base);
}

/* ===== 알림 토스트 ===== */
.toast {
  position: fixed;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  max-width: 400px;
  width: calc(100% - var(--spacing-xl));
  opacity: 0;
  transition: all var(--transition-normal);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.success {
  border-color: var(--success-color);
  background-color: #f0fdf4;
}

.toast.error {
  border-color: var(--error-color);
  background-color: #fef2f2;
}

.toast.warning {
  border-color: var(--warning-color);
  background-color: #fffbeb;
}

.toast-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.toast-icon {
  flex-shrink: 0;
  font-size: var(--font-size-lg);
}

.toast-message {
  flex: 1;
  font-size: var(--font-size-sm);
}

.toast-close {
  background: none;
  border: none;
  font-size: var(--font-size-lg);
  cursor: pointer;
  color: var(--text-muted);
  padding: 0;
  margin-left: var(--spacing-sm);
}

.toast-close:hover {
  color: var(--text-primary);
}

/* ===== 모달 ===== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  padding: var(--spacing-md);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: scale(1);
}

.modal-header {
  margin-bottom: var(--spacing-lg);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  color: var(--text-muted);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.modal-close:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-body {
  margin-bottom: var(--spacing-lg);
}

.modal-footer {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

.modal-footer .btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-footer .btn:hover {
  background-color: var(--bg-secondary);
  border-color: var(--border-hover);
}

.modal-footer .btn.primary {
  background-color: var(--primary-color);
  color: var(--text-inverse);
  border-color: var(--primary-color);
}

.modal-footer .btn.primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}

/* ===== 반응형 컴포넌트 ===== */
@media (max-width: 480px) {
  .line-btn {
    padding: var(--spacing-md);
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }
  
  .line-action {
    width: 2.5rem;
    height: 2.5rem;
  }
  
  .region-tabs {
    padding: var(--spacing-xs);
  }
  
  .tab-button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }
  
  .modal-content {
    padding: var(--spacing-lg);
    margin: var(--spacing-sm);
  }
  
  .modal-footer {
    flex-direction: column;
  }
  
  .toast {
    bottom: var(--spacing-md);
    width: calc(100% - var(--spacing-md));
  }
}

/* ===== 애니메이션 ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.3s ease-out;
}

.animate-slide-in {
  animation: slideIn 0.3s ease-out;
}

/* ===== 스켈레톤 로딩 ===== */
.skeleton {
  background: linear-gradient(90deg, 
    var(--bg-tertiary) 25%, 
    transparent 37%, 
    var(--bg-tertiary) 63%);
  background-size: 400% 100%;
  animation: skeleton-loading 1.4s ease-in-out infinite;
}

@keyframes skeleton-loading {
  0% {
    background-position: 100% 50%;
  }
  100% {
    background-position: -100% 50%;
  }
}

.skeleton-line {
  height: 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
}

.skeleton-line.short {
  width: 60%;
}

.skeleton-line.long {
  width: 80%;
}

.skeleton-button {
  height: 3rem;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
}