/* 全局配置 */
:root {
  --color-primary: #4A90E2;
  --color-secondary: #2D9C7A;
  --color-bg: #FFFFFF;
  --color-bg-light: #F5F7FA;
  --color-text: #333333;
  --color-text-light: #666666;
  --transition-speed: 0.3s;
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 全局字体 */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* 导航栏平滑过渡 */
.nav-link {
  position: relative;
  transition: color var(--transition-speed) ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-speed) ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--color-primary);
}

/* 页面切换动画 */
.page-section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.page-section.active {
  opacity: 1;
  transform: translateY(0);
}

.page-section.hidden {
  display: none;
}

/* 图片懒加载占位 */
img[data-src] {
  background: linear-gradient(90deg, var(--color-bg-light) 25%, #e0e0e0 50%, var(--color-bg-light) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

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

/* 卡片悬停效果 */
.card-hover {
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.card-hover:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(74, 144, 226, 0.15);
}

/* 轮播指示器 */
.carousel-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #d1d5db;
  transition: background-color var(--transition-speed) ease, width var(--transition-speed) ease;
  cursor: pointer;
}

.carousel-indicator.active {
  background-color: var(--color-primary);
  width: 32px;
  border-radius: 6px;
}

/* 按钮动效 */
.btn-primary {
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-speed) ease;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn-primary:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary:hover {
  transform: scale(1.05);
}

/* 服务图标动效 */
.service-icon {
  transition: transform var(--transition-speed) ease;
}

.service-icon:hover {
  transform: rotate(360deg) scale(1.1);
}

/* 响应式导航 */
@media (max-width: 768px) {
  .mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
  }
  
  .mobile-menu.open {
    max-height: 500px;
  }
}

/* 页脚样式 */
footer {
  border-top: 1px solid #e5e7eb;
  background-color: var(--color-bg-light);
}

/* 文字渐变效果 */
.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 分割线动效 */
.divider {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0.3;
}