/* 引入现代无衬线中文字体 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500&display=swap');

/* 全局变量定义 */
:root {
  --color-bg: #f8f8f8;
  --color-text-primary: #333333;
  --transition-smooth: all 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

/* 基础样式重置与排版 */
body {
  font-family: 'Noto Sans SC', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 极简滚动条 */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #d1d5db; border-radius: 2px; }

/* 核心动画关键帧 */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUpFade { 
  from { opacity: 0; transform: translateY(20px); } 
  to { opacity: 1; transform: translateY(0); } 
}

/* 通用动效类 */
.animate-fade-in { animation: fadeIn 0.8s ease-out forwards; }
.animate-slide-up { animation: slideUpFade 0.8s ease-out forwards; opacity: 0; }
.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }

/* 视觉交互组件 */
.hover-zoom-container { overflow: hidden; position: relative; }
.hover-zoom-img { transition: transform 0.8s ease; will-change: transform; }
.hover-zoom-container:hover .hover-zoom-img { transform: scale(1.05); }

/* 遮罩层效果 */
.hover-overlay {
  background: linear-gradient(to top, rgba(0,0,0,0.5), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}
.hover-zoom-container:hover .hover-overlay { opacity: 1; }

/* 轮播图逻辑样式 */
.carousel-item {
  position: absolute; inset: 0; opacity: 0; transition: opacity 1.2s ease-in-out; z-index: 0;
}
.carousel-item.active { opacity: 1; z-index: 10; }

/* 页面切换逻辑 */
.page-section { display: none; opacity: 0; transition: opacity 0.5s ease; }
.page-section.active-page { display: block; opacity: 1; }

/* 文字排版增强 */
.text-balance { text-wrap: balance; }
.tracking-widest-plus { letter-spacing: 0.2em; }