/* ========================
   滚动动画关键帧
   ======================== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes scrollDown {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(10px);
  }
}

@keyframes gridMove {
  0% { transform: translateY(0); }
  100% { transform: translateY(-50px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* 科技网格背景 */
.tech-grid {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.tech-grid::before {
  content: '';
  position: absolute;
  width: 200%;
  height: 200%;
  top: -50%;
  left: -50%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: gridMove 20s linear infinite;
}

/* 粒子效果 */
.particle {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  animation: float 6s ease-in-out infinite;
}

/* 动画初始状态（由JS添加visible类触发） */
.animate {
  opacity: 0;
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), 
              transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate.visible {
  opacity: 1;
  transform: translateY(0) translateX(0) scale(1);
}

.animate-fade-up {
  transform: translateY(30px);
}

.animate-fade-in {
  transform: none;
}

.animate-slide-left {
  transform: translateX(-30px);
}

.animate-slide-right {
  transform: translateX(30px);
}

.animate-scale-in {
  transform: scale(0.9);
}

/* 延迟类 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* 计数动画样式 */
.counter-value {
  font-variant-numeric: tabular-nums;
}

/* Hero 科技装饰圆 */
.hero-decoration {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.1);
  animation: pulse 4s ease-in-out infinite;
}

/* 下划线动画 */
.animated-underline {
  position: relative;
  display: inline-block;
}

.animated-underline::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--color-tech-blue);
  transition: width 0.4s ease;
}

.animated-underline:hover::after {
  width: 100%;
}

/* 时间线动画 */
.timeline-node {
  position: relative;
}

.timeline-node::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 4px solid var(--color-bg-blue);
  left: -8px;
  top: 0;
  transition: all 0.3s ease;
}

.timeline-node:hover::before {
  background: var(--color-tech-blue);
  transform: scale(1.2);
  box-shadow: 0 0 0 8px rgba(0, 168, 232, 0.2);
}

/* 图片悬停缩放 */
.img-zoom {
  overflow: hidden;
  border-radius: var(--radius-md);
}

.img-zoom img {
  transition: transform 0.5s ease;
}

.img-zoom:hover img {
  transform: scale(1.05);
}

/* 卡片列表项动画 */
.list-item-animate {
  opacity: 0;
  transform: translateX(-20px);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.list-item-animate.visible {
  opacity: 1;
  transform: translateX(0);
}

/* 标签切换 */
.tab-item {
  padding: 10px 24px;
  border-radius: 9999px;
  font-size: var(--text-small);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid var(--color-border);
  background: var(--color-white);
  color: var(--color-text-secondary);
}

.tab-item:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tab-item.active {
  background: var(--gradient-primary);
  color: var(--color-white);
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

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

::-webkit-scrollbar-track {
  background: var(--color-bg-light);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-secondary);
}

/* 选择文字颜色 */
::selection {
  background: var(--color-primary);
  color: var(--color-white);
}