/* 全局样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  transition: background-color 0.5s ease, color 0.5s ease;
}

/* 导航栏样式 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  padding: 0.5rem 0;
  transition: background 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: 0.5rem;
}

.logo img {
  height: 50px;
  width: auto;
  transition: transform 0.3s ease;
  display: block;
}

.logo span {
  font-size: 1.5rem;
  font-weight: 700;
  color: #007aff;
  transition: color 0.3s ease;
}

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

@media (max-width: 768px) {
  .logo img {
    height: 40px;
  }
}

@media (max-width: 480px) {
  .logo img {
    height: 35px;
  }

  .logo span {
    font-size: 1rem;
  }
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  margin-left: 2rem;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.nav-menu a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  font-size: 16px;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: background 0.3s ease, color 0.3s ease;
}

.nav-menu a:hover {
  color: #fff;
  background: #007aff;
  border-radius: 4px;
}

.nav-menu a.active {
  color: #007aff;
  font-weight: 600;
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 80px;
    right: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    flex-direction: column;
    padding: 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 999;
  }

  .nav-menu.active {
    display: flex;
    opacity: 1;
    transform: translateY(0);
  }

  .menu-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
  }

  .menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #333;
    margin: 5px 0;
    transition: 0.3s;
  }

  .nav-menu a {
    font-size: 18px;
    padding: 1rem 2rem;
    width: 100%;
    text-align: center;
  }
}

/* 主横幅样式 */
.hero-section {
  height: 100vh;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 1rem;
  transition: background 0.5s ease;
}

.hero-content {
  max-width: 800px;
  padding: 2rem;
}

.hero-content h1 {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  color: #1a1a1a;
  letter-spacing: -1px;
  transition: all 0.5s ease;
}

.hero-content p {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: #444;
  line-height: 1.4;
  transition: all 0.5s ease;
}

.hero-subtitle {
  font-size: 1.4rem !important;
  color: #666 !important;
  margin-bottom: 2rem !important;
  transition: all 0.5s ease;
}

.cta-button {
  display: inline-block;
  padding: 1rem 2rem;
  background: #007aff;
  color: white;
  text-decoration: none;
  border-radius: 30px;
  font-weight: 600;
  transition: background 0.3s;
}

.cta-button:hover {
  background: #0056b3;
}

/* 页脚样式优化 */
.footer {
  background: #f8f9fa;
  padding: 2rem 0;
  text-align: center;
  position: relative;
  z-index: 1;
  width: 100%;
  bottom: 0;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.footer-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footer-info p {
  color: #666;
  margin: 0;
  font-size: 14px;
  line-height: 1.5;
}

/* 备案链接样式优化 */
.beian-link {
  color: #666;
  text-decoration: none;
  transition: color 0.3s ease;
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
}

.beian-link:hover {
  color: #007aff;
}

/* 通用容器样式 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 1rem;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: #1a1a1a;
  transition: all 0.5s ease;
}

/* 关于我们部分 */
.about-section {
  background: #fff;
  transition: background 0.5s ease;
}

.about-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  padding: 1rem 0;
}

.about-text {
  padding: 2.5rem;
  background: #f8f9fa;
  border-radius: 15px;
  transition: all 0.5s ease;
}

.about-text h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: #1a1a1a;
  transition: all 0.5s ease;
}

.about-text p {
  color: #666;
  line-height: 1.8;
  font-size: 1.1rem;
  transition: all 0.5s ease;
}

/* 产品展示部分 */
.products-section {
  background: #f8f9fa;
  padding: 4rem 0;
  transition: background 0.5s ease;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  padding: 2rem 0;
}

.product-card {
  background: #fff;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.5s ease;
  display: flex;
  flex-direction: column;
}

.product-card picture {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.product-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.product-card h3 {
  padding: 1.5rem 1.5rem 0.5rem;
  margin: 0;
  font-size: 1.5rem;
  color: #333;
  transition: all 0.5s ease;
}

.product-card p {
  padding: 0 1.5rem 1.5rem;
  color: #666;
  flex-grow: 1;
  margin: 0;
  transition: all 0.5s ease;
}

.visit-button {
  display: inline-block;
  margin: 0 1.5rem 1.5rem;
  padding: 0.8rem 1.5rem;
  background: #007aff;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  text-align: center;
  transition: all 0.5s ease;
}

.visit-button:hover {
  background: #0056b3;
  transform: translateY(-2px);
}

/* 暗色模式适配 */
.dark-mode .product-card {
  background: #2d2d2d;
  transition: background 0.5s ease;
}

.dark-mode .product-card h3 {
  color: #f5f5f5;
  transition: color 0.5s ease;
}

.dark-mode .product-card p {
  color: #ccc;
  transition: color 0.5s ease;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .products-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem 0;
  }

  .product-card h3 {
    font-size: 1.3rem;
    padding: 1.2rem 1.2rem 0.5rem;
  }

  .product-card p {
    padding: 0 1.2rem 1.2rem;
  }

  .visit-button {
    margin: 0 1.2rem 1.2rem;
  }
}

/* 友情链接部分 */
.friends-section {
  background: #fff;
  padding: 4rem 0;
  transition: background 0.5s ease;
}

.friends-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  padding: 2rem 0;
}

.friend-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  padding: 1.5rem;
  background: #f8f9fa;
  border-radius: 15px;
  transition: all 0.5s ease;
}

.friend-link img {
  width: 120px;
  height: auto;
  margin-bottom: 1rem;
  transition: transform 0.3s ease;
}

.friend-link span {
  color: #333;
  font-weight: 500;
  font-size: 1.1rem;
  transition: all 0.5s ease;
}

.friend-link:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

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

/* 暗色模式适配 */
.dark-mode .friend-link {
  background: #2d2d2d;
  transition: background 0.5s ease;
}

.dark-mode .friend-link span {
  color: #f5f5f5;
  transition: color 0.5s ease;
}

/* 汉堡菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  position: relative;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #333;
  margin: 5px 0;
  transition: 0.3s;
}

/* 移动端菜单展开时的样式 */
.nav-menu.active {
  transform: translateX(0);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* 页脚logo样式 */
.footer-logo {
  width: 100px;
  height: auto;
  margin-bottom: 1rem;
}

/* 动画效果 */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.animate {
  opacity: 1;
  transform: translateY(0);
}

/* 卡片悬停效果 */
.product-card,
.friend-link,
.about-text {
  transition: all 0.5s ease;
}

.product-card:hover,
.friend-link:hover,
.about-text:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

/* 按钮动画 */
.cta-button,
.visit-button {
  position: relative;
  overflow: hidden;
}

.cta-button::after,
.visit-button::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.cta-button:hover::after,
.visit-button:hover::after {
  width: 300px;
  height: 300px;
}

/* 页面加载动画 */
.loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s, visibility 0.5s;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-icon {
  width: 50px;
  height: 50px;
  border: 3px solid #f3f3f3;
  border-top: 3px solid #007aff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* 滚动进度条 */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: #007aff;
  z-index: 1002;
  transition: width 0.3s;
}

/* 暗色模式样式 */
.dark-mode {
  background: #1a1a1a;
  color: #f5f5f5;
}

.dark-mode .header {
  background: rgba(26, 26, 26, 0.98);
  transition: background 0.5s ease;
}

.dark-mode .nav-menu a {
  color: #f5f5f5;
  transition: color 0.5s ease;
}

.dark-mode .hero-section {
  background: linear-gradient(135deg, #2d3436 0%, #000000 100%);
  transition: background 0.5s ease;
}

.dark-mode .about-section,
.dark-mode .team-section {
  background: #1a1a1a;
  transition: background 0.5s ease;
}

.dark-mode .products-section,
.dark-mode .friends-section,
.dark-mode .footer {
  background: #2d2d2d;
  transition: background 0.5s ease;
}

.dark-mode .about-text,
.dark-mode .product-card,
.dark-mode .team-member,
.dark-mode .friend-link {
  background: #333;
  color: #f5f5f5;
  transition: background 0.5s ease, color 0.5s ease;
}

.dark-mode .section-title {
  color: #f5f5f5;
  transition: color 0.5s ease;
}

/* 控制按钮容器 */
.control-buttons {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1000;
}

/* 浮动按钮通用样式 */
.scroll-to-top,
.dark-mode-toggle,
.lang-toggle {
  position: fixed;
  right: 20px;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  background: #ffffff;
  color: #1a1a1a;
  border: 2px solid #e0e0e0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  padding: 0;
  z-index: 1000;
}

/* 设置各按钮位置 */
.scroll-to-top {
  bottom: 130px;
  opacity: 0;
  visibility: hidden;
}

.dark-mode-toggle {
  bottom: 75px;
}

.lang-toggle {
  bottom: 20px;
}

/* 返回顶部按钮显示状态 */
.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
}

/* 暗色模式图标 */
.dark-mode-toggle::before {
  content: "🌓";
}

/* 按钮悬停效果 */
.scroll-to-top:hover,
.dark-mode-toggle:hover,
.lang-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* 按钮点击效果 */
.scroll-to-top:active,
.dark-mode-toggle:active,
.lang-toggle:active {
  transform: scale(0.95);
}

/* 暗色模式下的按钮样式 */
.dark-mode .scroll-to-top,
.dark-mode .dark-mode-toggle,
.dark-mode .lang-toggle {
  background: #2d2d2d;
  color: #f5f5f5;
  border-color: #404040;
}

/* 移动端适配 */
@media (max-width: 768px) {
  .scroll-to-top,
  .dark-mode-toggle,
  .lang-toggle {
    right: 15px;
    width: 35px;
    height: 35px;
    font-size: 0.9rem;
  }

  .scroll-to-top {
    bottom: 120px;
  }

  .dark-mode-toggle {
    bottom: 65px;
  }

  .lang-toggle {
    bottom: 15px;
  }
}

/* 小屏幕进一步调整 */
@media (max-width: 480px) {
  .scroll-to-top {
    bottom: 135px;
  }
}

/* 错误页面样式 */
.error-page {
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.error-logo {
  width: 150px;
  height: auto;
  margin-bottom: 2rem;
}

.error-page h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: #1a1a1a;
}

.error-page p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  color: #666;
}

.dark-mode .error-page h1 {
  color: #f5f5f5;
}

.dark-mode .error-page p {
  color: #ccc;
}

/* 图片懒加载样式 */
.lazy {
  opacity: 0;
  transition: opacity 0.3s ease-in;
}

.lazy.loaded {
  opacity: 1;
}

/* 图片加载错误样式 */
.img-error {
  min-height: 100px;
  background-color: #f8f9fa;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #666;
  font-size: 0.9rem;
}

/* 响应式图片容器 */
picture {
  display: block;
  width: 100%;
  height: 100%;
}

picture img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 图片加载动画 */
.lazy:not(.loaded) {
  position: relative;
  background: #f8f9fa;
}

.lazy:not(.loaded)::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #f8f9fa 25%, #e9ecef 50%, #f8f9fa 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

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

/* 暗色模式适配 */
.dark-mode .lazy:not(.loaded) {
  background: #2d2d2d;
}

.dark-mode .lazy:not(.loaded)::after {
  background: linear-gradient(90deg, #2d2d2d 25%, #1a1a1a 50%, #2d2d2d 75%);
}

.dark-mode .img-error {
  background-color: #2d2d2d;
  color: #ccc;
}

/* 暗色模式适配 */
.dark-mode .hero-content h1 {
  color: #f5f5f5;
}

.dark-mode .hero-content p {
  color: #e0e0e0;
}

.dark-mode .hero-subtitle {
  color: #ccc !important;
}

.dark-mode .about-text h3 {
  color: #f5f5f5;
}

.dark-mode .about-text p {
  color: #ccc;
}

/* 暗色模式适配 */
.dark-mode .logo span {
  color: #f5f5f5;
}

/* 所有需要过渡的元素添加过渡效果 */
.header,
.nav-menu a,
.hero-section,
.about-section,
.products-section,
.friends-section,
.footer,
.about-text,
.product-card,
.friend-link,
.section-title,
.hero-content h1,
.hero-content p,
.about-text h3,
.about-text p,
.product-card h3,
.product-card p,
.friend-link span,
.logo span {
  transition: all 0.5s ease;
}

/* 暗色模式适配 */
.dark-mode .beian-link {
  color: #ccc;
}

.dark-mode .beian-link:hover {
  color: #3a9eff;
}