:root {
  --primary-color: #6366f1;
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --secondary-color: #10b981;
  --text-color: #374151;
  --light-text: #9ca3af;
  --bg-color: #f9fafb;
  --card-bg: #ffffff;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --border-radius: 12px;
}

/* 暗色主题变量 */
[data-theme="dark"] {
  --primary-color: #818cf8;
  --primary-gradient: linear-gradient(135deg, #818cf8 0%, #a78bfa 100%);
  --secondary-color: #34d399;
  --text-color: #f3f4f6;
  --light-text: #d1d5db;
  --bg-color: #111827;
  --card-bg: #1f2937;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.15);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none; /* 禁止选择文本 */
  -webkit-user-select: none; /* Safari 浏览器 */
  -moz-user-select: none; /* Firefox 浏览器 */
  -ms-user-select: none; /* IE 浏览器 */
  cursor: default; /* 默认鼠标样式 */
}

/* 输入框等需要允许选择的元素可以单独设置 */
input, textarea {
  user-select: auto;
  -webkit-user-select: auto;
  -moz-user-select: auto;
  -ms-user-select: auto;
  cursor: text;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-touch-callout: none; /* 禁止iOS设备上的链接等元素的长按菜单 */
  transition: background-color 0.3s ease, color 0.3s ease;
}

img, svg {
  pointer-events: none; /* 禁止图片和SVG的鼠标事件 */
}

/* 指针样式的元素 */
a, button, .project-card, #searchButton, .theme-toggle {
  cursor: pointer;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* 头部区域 */
.header {
  margin-bottom: 4rem;
}

.header-content {
  text-align: center;
  margin-bottom: 2rem;
  position: relative;
}

/* 主题切换按钮 */
.theme-toggle {
  position: absolute;
  right: 0;
  top: 0;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-color);
  padding: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  transition: background-color 0.3s;
}

.theme-toggle:hover {
  background-color: rgba(99, 102, 241, 0.1);
}

.theme-toggle svg {
  width: 24px;
  height: 24px;
  transition: transform 0.5s ease;
}

.theme-toggle:hover svg {
  transform: rotate(30deg);
}

.header-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.header-subtitle {
  font-size: 1.1rem;
  color: var(--light-text);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* 搜索框 */
.search-box {
  display: flex;
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.search-box:focus-within {
  transform: translateY(-2px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.search-box input {
  flex: 1;
  padding: 1rem 1.5rem;
  border: none;
  outline: none;
  font-size: 1rem;
  background: transparent;
  color: var(--text-color);
}

.search-box button {
  padding: 1rem 1.5rem;
  border: none;
  background: var(--primary-gradient);
  color: white;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.3s;
}

.search-box button:hover {
  opacity: 0.9;
}

/* 项目网格布局 */
.projects-container {
  position: relative;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.project-card {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.project-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.project-card:hover::after {
  transform: scaleX(1);
}

.project-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.3s ease, filter 0.3s ease;
}

.project-card img.loaded {
  opacity: 1;
}

.project-card:hover img.loaded {
  filter: brightness(1.05);
}

.project-card .image-placeholder {
  width: 100%;
  height: 220px;
  background: #f3f4f6;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  top: 0;
  left: 0;
}

[data-theme="dark"] .project-card .image-placeholder {
  background: #374151;
}

.project-card .image-placeholder::after {
  content: '';
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 3px solid #e5e7eb;
  border-top-color: var(--primary-color);
  animation: spin 1s linear infinite;
}

[data-theme="dark"] .project-card .image-placeholder::after {
  border-color: #4b5563;
  border-top-color: var(--primary-color);
}

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

.project-info {
  padding: 1.5rem;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.5rem;
}

/* 分页控件 */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 3rem;
}

.pagination button {
  min-width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background-color: var(--card-bg);
  color: var(--text-color);
  border-radius: 8px;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: all 0.2s;
}

.pagination button:hover {
  background-color: rgba(99, 102, 241, 0.1);
  color: var(--primary-color);
}

.pagination button.active {
  background: var(--primary-gradient);
  color: white;
}

/* 加载动画 */
.loader {
  display: none;
  justify-content: center;
  margin: 2rem 0;
}

.loader.active {
  display: flex;
}

.loader div {
  width: 1rem;
  height: 1rem;
  background-color: var(--primary-color);
  border-radius: 50%;
  margin: 0 0.5rem;
  animation: bounce 0.5s infinite alternate;
}

.loader div:nth-child(2) {
  animation-delay: 0.1s;
}

.loader div:nth-child(3) {
  animation-delay: 0.2s;
}

@keyframes bounce {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-10px);
  }
}

/* 骨架屏样式 */
.skeleton {
  background: linear-gradient(90deg, var(--card-bg) 25%, rgba(99, 102, 241, 0.1) 50%, var(--card-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--border-radius);
}

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

.skeleton-card {
  height: 320px;
  border-radius: var(--border-radius);
  overflow: hidden;
}

.skeleton-image {
  height: 220px;
  width: 100%;
}

.skeleton-title {
  height: 24px;
  margin: 1rem;
  width: 80%;
}

.skeleton-text {
  height: 16px;
  margin: 0.5rem 1rem;
  width: 60%;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  .header {
    margin-bottom: 2rem;
  }
  
  .header-title {
    font-size: 2rem;
  }
  
  .projects-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
  }
  
  .theme-toggle {
    position: relative;
    margin: 0 auto 1rem;
  }
}

@media (max-width: 480px) {
  .header-title {
    font-size: 1.75rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .search-box {
    flex-direction: column;
  }
  
  .search-box input {
    padding: 0.75rem 1rem;
  }
  
  .search-box button {
    width: 100%;
    padding: 0.75rem;
  }
}