.github-projects-container {
  max-width: var(--container-max-width-lg);
  margin: 0 auto;
  padding: 0;
  min-height: calc(100vh - 250px);
}

/* 顶部标签过滤区域 */
.filter-section {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--color-white-70);
  backdrop-filter: var(--blur-sm);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-primary-10);
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.06);
  position: relative;
}

.filter-label {
  font-weight: 600;
  color: var(--color-text-medium);
  white-space: nowrap;
  padding-top: 0.6rem;
  font-size: 0.95rem;
}

.filter-tags-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  flex: 1;
  max-height: 42px;
  overflow: hidden;
  transition: var(--transition-expand);
  position: relative;
}

.filter-tags-wrapper.expanded {
  max-height: 500px;
}

.toggle-tags-btn {
  padding: 0.6rem 1rem;
  background: var(--gradient-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-2xl);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-btn);
}

.toggle-tags-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-btn-hover);
}

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

.toggle-tags-btn.expanded .toggle-icon {
  transform: rotate(180deg);
}

.tag-filter {
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  border-radius: var(--radius-3xl);
  cursor: pointer;
  transition: var(--transition-normal);
  font-size: 0.9rem;
  color: var(--color-text-gray);
  font-weight: 500;
  box-shadow: var(--shadow-xs);
}

.tag-filter:hover {
  background: var(--color-light);
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px var(--color-primary-15);
}

.tag-filter.active {
  background: var(--gradient-primary);
  color: var(--color-white);
  border-color: transparent;
  box-shadow: var(--shadow-btn-hover);
}

/* 主内容区域：左右布局 */
.main-content {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 2rem;
  align-items: start;
}

/* 左侧项目列表 */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.project-card {
  background: var(--color-white-80);
  backdrop-filter: var(--blur-lg);
  border: 1px solid var(--color-primary-15);
  border-radius: var(--radius-xl);
  padding: 2rem;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-card);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--color-primary-18);
  border-color: var(--color-primary-30);
  background: var(--color-white-95);
}

.project-card.hidden {
  display: none;
}

.project-header {
  margin-bottom: 1rem;
}

.project-title-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.project-name {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  flex: 1;
}

.project-name a {
  color: var(--color-text-primary);
  text-decoration: none;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: var(--transition-normal);
}

.project-name a:hover {
  opacity: 0.8;
}

.project-stars {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border-radius: var(--radius-lg);
  color: #92400e;
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(251, 191, 36, 0.2);
}

.star-icon {
  fill: #f59e0b;
}

.project-description {
  color: var(--color-text-medium);
  line-height: var(--line-height);
  margin: 0 0 1.5rem 0;
  font-size: 1rem;
}

.project-meta {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.project-language-section,
.project-tags-section {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.meta-label {
  font-size: 0.85rem;
  color: var(--color-text-gray);
  font-weight: 600;
  white-space: nowrap;
}

.project-languages {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex: 1;
}

.project-language {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-text-gray);
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  background: var(--color-light-blue-80);
  border-radius: var(--radius-base);
}

.language-dot {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  display: inline-block;
  flex-shrink: 0;
}

.language-more {
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  background: var(--color-light-blue-50);
  border-radius: var(--radius-base);
  white-space: nowrap;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex: 1;
}

.project-tags .tag {
  padding: 0.4rem 0.9rem;
  background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
  border: 1px solid #a5b4fc;
  border-radius: var(--radius-lg);
  font-size: 0.8rem;
  color: #4338ca;
  font-weight: 500;
  transition: var(--transition-normal);
  box-shadow: 0 1px 3px rgba(67, 56, 202, 0.1);
}

.project-tags .tag:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(67, 56, 202, 0.2);
  background: linear-gradient(135deg, #c7d2fe 0%, #a5b4fc 100%);
}

/* 右侧时间线 */
.timeline-sidebar {
  position: sticky;
  top: 100px;
  background: linear-gradient(135deg, var(--color-white-95) 0%, var(--color-light-90) 100%);
  backdrop-filter: var(--blur-lg);
  border: 1px solid var(--color-primary-20);
  border-radius: var(--radius-xl);
  padding: 1.5rem 1rem;
  box-shadow: 0 4px 20px var(--color-primary-10);
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

.timeline-title {
  margin: 0 0 1.25rem 0;
  font-size: 1rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--color-primary-15);
  text-align: center;
  letter-spacing: 0.3px;
}

.timeline {
  position: relative;
  padding-left: 0;
}

.timeline::before {
  display: none;
}

.timeline-year-group {
  position: relative;
  margin-bottom: 1.5rem;
}

.timeline-year-group:last-child {
  margin-bottom: 0;
}

.timeline-year-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 0.5rem 0.75rem;
  margin: -0.5rem -0.75rem 0.75rem -0.75rem;
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
  background: rgba(102, 126, 234, 0.03);
  border-left: 3px solid transparent;
}

.timeline-year-header:hover {
  background: linear-gradient(90deg, var(--color-primary-10) 0%, var(--color-secondary-05) 100%);
  border-left-color: var(--color-primary);
}

.year-toggle-icon {
  transition: var(--transition-transform);
  color: var(--color-primary);
  flex-shrink: 0;
  width: 14px;
  height: 14px;
}

.timeline-year-group.collapsed .year-toggle-icon {
  transform: rotate(-90deg);
}

.timeline-year {
  font-size: 1.1rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  padding-left: 0;
  position: relative;
  letter-spacing: 0.5px;
}

.timeline-year::before {
  display: none;
}

.timeline-year-items {
  overflow: hidden;
  transition: var(--transition-slow);
  max-height: 2000px;
  opacity: 1;
}

.timeline-year-group.collapsed .timeline-year-items {
  max-height: 0;
  opacity: 0;
  margin-top: 0;
}

.timeline-year-group::before {
  display: none;
}

.timeline-item {
  position: relative;
  padding-bottom: 1rem;
  cursor: pointer;
  transition: var(--transition-normal);
  padding-left: 0;
}

.timeline-item.hidden {
  display: none;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item:hover .timeline-content {
  background: linear-gradient(90deg, var(--color-primary-12) 0%, rgba(118, 75, 162, 0.06) 100%);
}

.timeline-dot {
  display: none;
}

.timeline-content {
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-base);
  transition: var(--transition-smooth);
  border-left: 3px solid transparent;
  background: var(--color-light-50);
}

.timeline-item:hover .timeline-content {
  border-left-color: var(--color-primary);
}

.timeline-project-name {
  font-weight: 600;
  color: var(--color-text-primary);
  font-size: 0.875rem;
  margin-bottom: 0.3rem;
  line-height: var(--line-height-tight);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.timeline-time {
  font-size: 0.75rem;
  color: var(--color-text-light);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.timeline-time::before {
  content: '';
  font-size: 0.7rem;
}

/* 滚动条样式 */
.timeline-sidebar::-webkit-scrollbar {
  width: 8px;
}

.timeline-sidebar::-webkit-scrollbar-track {
  background: var(--color-primary-05);
  border-radius: var(--radius-md);
  margin: 8px 0;
}

.timeline-sidebar::-webkit-scrollbar-thumb {
  background: var(--gradient-primary-vertical);
  border-radius: var(--radius-md);
  border: 2px solid var(--color-white-30);
}

.timeline-sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--gradient-secondary-vertical);
  box-shadow: 0 0 6px var(--color-primary-50);
}

/* 移动端悬浮时间线按钮 */
.mobile-timeline-toggle {
  display: none; /* 默认隐藏，JavaScript 会在移动端显示 */
  position: fixed;
  right: 20px;
  bottom: 80px;
  width: 56px;
  height: 56px;
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 20px var(--color-primary-40);
  cursor: pointer;
  z-index: var(--z-floating);
  transition: var(--transition-normal);
  padding: 0;
  align-items: center;
  justify-content: center;
}

.mobile-timeline-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-focus);
}

.mobile-timeline-toggle:active {
  transform: scale(0.95);
}

.timeline-icon {
  font-size: 32px;
  line-height: 1;
  filter: brightness(1.2);
}

/* 移动端时间线遮罩 */
.mobile-timeline-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--color-overlay);
  z-index: var(--z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.mobile-timeline-overlay.show {
  opacity: 1;
  visibility: visible;
}

/* 移动端底部弹出时间线 */
.mobile-bottom-timeline {
  position: fixed;
  bottom: -100%;
  left: 0;
  width: 100%;
  max-height: 70vh;
  background: var(--color-white-98);
  backdrop-filter: var(--blur-lg);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  box-shadow: var(--shadow-top);
  z-index: var(--z-modal);
  transition: bottom 0.3s ease;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.mobile-bottom-timeline.open {
  bottom: 0;
}

.mobile-bottom-timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 2px solid var(--color-primary-15);
  background: var(--gradient-primary-light);
}

.mobile-bottom-timeline-header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mobile-bottom-timeline-close {
  width: 32px;
  height: 32px;
  background: var(--color-primary-10);
  border: none;
  border-radius: var(--radius-base);
  font-size: 24px;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-normal);
}

.mobile-bottom-timeline-close:hover {
  background: var(--color-primary-20);
  transform: scale(1.1);
}

.mobile-bottom-timeline-nav {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  padding-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
}

/* 响应式设计 */
@media (max-width: 768px) {
  /* 显示移动端悬浮按钮 */
  .mobile-timeline-toggle {
    display: flex !important;
  }

  .github-projects-container {
    min-height: calc(100vh - 200px);
  }

  .main-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  /* 隐藏桌面端时间线 */
  .timeline-sidebar {
    display: none;
  }

  .project-card {
    padding: 1.5rem;
  }

  .project-name {
    font-size: 1.25rem;
  }

  .filter-section {
    padding: 1rem;
    flex-direction: column;
    align-items: stretch;
  }

  .filter-label {
    padding-top: 0;
  }

  .filter-tags-wrapper {
    max-height: 42px;
  }

  .tag-filter {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
  }

  .timeline-sidebar {
    padding: 1.25rem 0.875rem;
  }
}

@media (max-width: 480px) {
  .github-projects-container {
    padding: 0;
    min-height: calc(100vh - 180px);
  }

  .project-title-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .project-stars {
    align-self: flex-start;
  }

  .filter-section {
    gap: 0.75rem;
  }

  .filter-label {
    font-size: 0.9rem;
  }

  .toggle-tags-btn {
    font-size: 0.8rem;
    padding: 0.5rem 0.8rem;
  }
}