@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500&family=Noto+Sans+SC:wght@300;400;500&display=swap');

/* 基础设置 */
:root {
  --color-text-main: #333333;
  --color-text-sub: #666666;
  --bg-color: #FFFFFF;
  --transition-smooth: cubic-bezier(0.16, 1, 0.3, 1);
}

body {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  color: var(--color-text-main);
  background-color: var(--bg-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 极简滚动条 */
::-webkit-scrollbar {
  width: 4px;
  height: 4px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #E5E5E5;
  border-radius: 2px;
}
::-webkit-scrollbar-thumb:hover {
  background: #CCCCCC;
}

/* 工具类：文本选中颜色 */
::selection {
  background: #F0F0F0;
  color: #000;
}

/* 动画：优雅上浮淡入 */
.fade-in-up {
  opacity: 0;
  animation: fadeInUp 1.2s var(--transition-smooth) forwards;
}

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }

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

/* 图片交互：容器与缩放 */
.img-wrapper {
  overflow: hidden;
  background-color: #F9F9F9; /* 加载占位色 */
  position: relative;
}

.img-scale {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.5s var(--transition-smooth), opacity 0.5s ease;
  will-change: transform;
}

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

/* 导航链接下划线动效 */
.nav-link {
  position: relative;
  display: inline-block;
}

.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 1px;
  bottom: -2px;
  left: 0;
  background-color: #333;
  transition: width 0.4s var(--transition-smooth);
}

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

/* 移动端菜单过渡 */
.mobile-menu-enter {
  transform: translateX(100%);
  transition: transform 0.5s var(--transition-smooth);
}
.mobile-menu-enter-active {
  transform: translateX(0);
}

/* 辅助：隐藏滚动条但保留功能 */
.scrollbar-hide {
    -ms-overflow-style: none;
    scrollbar-width: none;
}
.scrollbar-hide::-webkit-scrollbar {
    display: none;
}