/* 全局基础设置 */
:root {
  --color-primary: #1a1a1a;   /* 深灰主色 */
  --color-secondary: #f5f5f5; /* 浅灰背景 */
  --color-accent: #2c5282;    /* 深蓝点缀 */
  --font-base: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

body {
  font-family: var(--font-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--color-secondary);
  color: var(--color-primary);
  overflow-x: hidden;
  line-height: 1.6;
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background-color: #cbd5e0;
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background-color: #a0aec0;
}

/* 文本选择样式 */
::selection {
  background-color: #2d3748;
  color: #ffffff;
}

/* 页面淡入过渡动画 */
.page-transition {
  animation: fadeInPage 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes fadeInPage {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 滚动显现元素动画 */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s ease-out, transform 1s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 图片悬停缩放微动效 */
.hover-zoom-container {
  overflow: hidden;
}
.hover-zoom-img {
  transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.group:hover .hover-zoom-img {
  transform: scale(1.03);
}

/* 导航栏动态样式 */
#main-nav {
  transition: background-color 0.4s ease, padding 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}
#main-nav.scrolled {
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  padding-top: 1rem;
  padding-bottom: 1rem;
}
#main-nav.scrolled .nav-link {
  color: #1a1a1a;
}

/* 灯箱组件样式 */
#lightbox {
  backdrop-filter: blur(20px);
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
#lightbox.active {
  opacity: 1;
  visibility: visible;
}
#lightbox:not(.active) {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* 收藏心形图标动画 */
.heart-icon {
  transition: fill 0.3s ease, transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.heart-icon.active {
  fill: currentColor; 
  transform: scale(1.1);
}
.heart-btn:active .heart-icon {
  transform: scale(0.9);
}

/* 加载骨架屏动画 */
.skeleton-loader {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 瀑布流布局辅助 */
.masonry-grid {
  column-count: 1;
  column-gap: 1.5rem;
}
@media (min-width: 640px) { .masonry-grid { column-count: 2; } }
@media (min-width: 1024px) { .masonry-grid { column-count: 3; } }

.masonry-item {
  break-inside: avoid;
  margin-bottom: 1.5rem;
}

/* 极简按钮悬停效果 */
.btn-minimal {
  position: relative;
  overflow: hidden;
}
.btn-minimal::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.btn-minimal:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}