/* 全局样式设定 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@100;300;400;500&display=swap');

:root {
  --font-primary: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --color-dark: #333333;
  --color-light: #666666;
  --color-bg: #ffffff;
  --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-dark);
  overflow-x: hidden;
}

/* 极简滚动条设计 */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #e5e5e5;
  border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
  background: #a3a3a3;
}

/* 动画工具类 */
.fade-in-up {
  animation: fadeInUp 0.8s var(--transition-smooth) forwards;
  opacity: 0;
  transform: translateY(20px);
}

.fade-in {
  animation: fadeIn 1s var(--transition-smooth) forwards;
  opacity: 0;
}

.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-500 { animation-delay: 500ms; }
.delay-700 { animation-delay: 700ms; }

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

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

/* 交互特效 */
.hover-zoom-img {
  transition: transform 0.6s var(--transition-smooth), filter 0.4s ease;
  will-change: transform;
}

.group:hover .hover-zoom-img {
  transform: scale(1.03);
}

.nav-link {
  position: relative;
  display: inline-block;
}

.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 1px;
  bottom: -2px;
  left: 50%;
  background-color: var(--color-dark);
  transition: width 0.3s ease, left 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
  left: 0;
}

/* 加载状态与骨架屏 */
.skeleton-bg {
  background: #f0f0f0;
  background: linear-gradient(90deg, #f0f0f0 25%, #f8f8f8 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

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

/* 细节页放大镜样式 */
.zoom-cursor {
  cursor: zoom-in;
}

.zoom-overlay {
  cursor: zoom-out;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(5px);
}

/* 极简主义辅助类 */
.text-balance {
  text-wrap: balance;
}

.tracking-widest-plus {
  letter-spacing: 0.2em;
}

/* 移动端菜单过渡 */
.mobile-menu-transition {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.mobile-menu-hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-10px);
}

.mobile-menu-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}