/* 全局样式重置与基础配置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-gray-light: #f5f5f5;
  --color-gray: #999999;
  --color-gray-dark: #666666;
  --color-border: #e0e0e0;
  --font-primary: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: all var(--transition-smooth);
  backdrop-filter: blur(10px);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

/* 轮播图样式 */
.hero-slider {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.slide.active {
  opacity: 1;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* 图片悬停效果 */
.image-hover {
  overflow: hidden;
  position: relative;
}

.image-hover img {
  transition: transform var(--transition-smooth);
  will-change: transform;
}

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

/* 图片懒加载占位 */
img[loading="lazy"] {
  background: var(--color-gray-light);
}

/* 瀑布流布局 */
.masonry-grid {
  column-count: 3;
  column-gap: 24px;
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 24px;
}

/* 模态框样式 */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-smooth);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
}

/* 垂直导航 */
.vertical-nav {
  position: sticky;
  top: 120px;
  writing-mode: vertical-rl;
}

.vertical-nav a {
  display: block;
  padding: 16px 0;
  color: var(--color-gray-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.vertical-nav a:hover,
.vertical-nav a.active {
  color: var(--color-text);
}

/* 标签导航 */
.tag-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.tag-nav button {
  padding: 8px 24px;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-gray-dark);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-primary);
  font-size: 14px;
}

.tag-nav button:hover,
.tag-nav button.active {
  border-color: var(--color-text);
  color: var(--color-text);
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .masonry-grid {
    column-count: 2;
  }
}

@media (max-width: 768px) {
  .masonry-grid {
    column-count: 1;
  }
  
  .vertical-nav {
    position: static;
    writing-mode: horizontal-tb;
    display: flex;
    gap: 16px;
    overflow-x: auto;
  }
  
  .vertical-nav a {
    padding: 8px 16px;
    white-space: nowrap;
  }
}

/* 页脚样式 */
footer {
  padding: 40px 0;
  text-align: center;
  color: var(--color-gray);
  font-size: 12px;
  border-top: 1px solid var(--color-border);
}

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

.fade-in {
  animation: fadeIn 0.8s ease-out;
}

/* 加载状态 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-gray-light);
  border-top-color: var(--color-text);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 可访问性增强 */
:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}