/* ========================================
   返回顶部按钮
   ======================================== */

.back-to-top {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 50px;
  height: 50px;
  background-image: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  color: var(--color-primary-dark);
  border: none;
  border-radius: 50%;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  z-index: 999;
  transition: all var(--transition-base);
  box-shadow: var(--box-shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--box-shadow-xl);
}

.back-to-top:active {
  transform: translateY(0);
}

/* ========================================
   面包屑导航
   ======================================== */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-gray);
}

.breadcrumb a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.breadcrumb-separator {
  color: var(--color-text-gray);
}

/* ========================================
   标签与徽章
   ======================================== */

.badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: rgba(33, 36, 40, 0.9);
  color: var(--color-text-light);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.badge-secondary {
  background-color: rgba(255, 193, 7, 0.2);
  color: var(--color-secondary-dark);
}

.badge-success {
  background-color: rgba(76, 175, 80, 0.2);
  color: var(--color-success);
}

.badge-warning {
  background-color: rgba(255, 152, 0, 0.2);
  color: var(--color-accent);
}

.badge-error {
  background-color: rgba(255, 82, 82, 0.2);
  color: var(--color-error);
}

.badge-outline {
  background-color: transparent;
  border: 1px dashed rgba(93, 96, 102, 0.6);
  color: var(--color-primary);
}

/* ========================================
   警告框与提示框
   ======================================== */

.alert {
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  border-radius: var(--border-radius-base);
  border-left: 4px solid;
}

.alert-info {
  background-color: #E3F2FD;
  border-color: #2196F3;
  color: #1565C0;
}

.alert-success {
  background-color: #E8F5E9;
  border-color: var(--color-success);
  color: #2E7D32;
}

.alert-warning {
  background-color: #FFF3E0;
  border-color: var(--color-warning);
  color: #E65100;
}

.alert-error {
  background-color: #FFEBEE;
  border-color: var(--color-error);
  color: #C62828;
}

.alert-close {
  float: right;
  font-size: var(--font-size-lg);
  cursor: pointer;
  color: inherit;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.alert-close:hover {
  opacity: 1;
}

/* ========================================
   进度条
   ======================================== */

.progress {
  width: 100%;
  height: 8px;
  background-color: var(--color-background-light);
  border-radius: var(--border-radius-full);
  overflow: hidden;
  margin-bottom: var(--spacing-md);
}

.progress-bar {
  height: 100%;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
  border-radius: var(--border-radius-full);
}

.progress-bar-secondary {
  background-color: var(--color-secondary);
}

.progress-bar-success {
  background-color: var(--color-success);
}

/* ========================================
   分页
   ======================================== */

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xs);
  margin: var(--spacing-lg) 0;
  list-style: none;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-base);
  color: var(--color-text-dark);
  text-decoration: none;
  transition: all var(--transition-fast);
  font-weight: var(--font-weight-medium);
}

.pagination a:hover {
  background-color: var(--color-secondary);
  color: var(--color-primary-dark);
  border-color: var(--color-secondary);
}

.pagination .active {
  background-color: var(--color-secondary);
  color: var(--color-primary-dark);
  border-color: var(--color-secondary);
}

.pagination .disabled {
  color: var(--color-text-light-gray);
  cursor: not-allowed;
}

/* ========================================
   模态框
   ======================================== */

.modal {
  display: none;
  position: fixed;
  z-index: 1100;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  animation: fadeIn var(--transition-fast);
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background-color: var(--color-background);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--box-shadow-xl);
  max-width: 500px;
  width: 90%;
  animation: slideUp var(--transition-base);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border-light);
}

.modal-header h2 {
  margin: 0;
  font-size: var(--font-size-h3);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  color: var(--color-text-gray);
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--color-text-dark);
}

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

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border-light);
}

/* ========================================
   标签页
   ======================================== */

.tabs {
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: var(--spacing-lg);
}

.tab-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-lg);
}

.tab-button {
  background: none;
  border: none;
  padding: var(--spacing-md) 0;
  color: var(--color-text-gray);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.tab-button:hover {
  color: var(--color-text-dark);
}

.tab-button.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn var(--transition-fast);
}

/* ========================================
   手风琴
   ======================================== */

.accordion {
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-base);
  overflow: hidden;
}

.accordion-item {
  border-bottom: 1px solid var(--color-border-light);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-header {
  background-color: var(--color-background-light);
  padding: var(--spacing-md);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-fast);
}

.accordion-header:hover {
  background-color: var(--color-background-dark);
}

.accordion-header.active {
  background-color: #1F2128;
  color: var(--color-secondary);
}

.accordion-icon {
  transition: transform var(--transition-fast);
}

.accordion-header.active .accordion-icon {
  transform: rotate(180deg);
}

.accordion-content {
  display: none;
  padding: var(--spacing-md);
  background-color: var(--color-background);
}

.accordion-content.active {
  display: block;
  animation: slideDown var(--transition-fast);
}

/* ========================================
   动画
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideDown {
  from {
    max-height: 0;
    opacity: 0;
  }
  to {
    max-height: 1000px;
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    transform: translateX(-20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

[data-animate] {
  opacity: 0;
  animation: slideIn var(--transition-base) forwards;
}

[data-animate].animated {
  opacity: 1;
}

/* ========================================
   响应式设计
   ======================================== */

@media (max-width: 768px) {
  .back-to-top {
    width: 45px;
    height: 45px;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    font-size: var(--font-size-lg);
  }
  
  .modal-content {
    max-width: 90%;
  }
  
  .tab-list {
    gap: var(--spacing-md);
    overflow-x: auto;
  }
  
  .tab-button {
    white-space: nowrap;
  }
}