* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'SimSun', 'STSong', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: #f5f1e8;
}

::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.3);
}

/* 导航样式 */
.navigation {
  position: fixed;
  top: 30px;
  left: 30px;
  z-index: 1000;
  display: flex;
  gap: 20px;
}

.nav-link {
  color: #2c2c2c;
  text-decoration: none;
  padding: 10px 20px;
  font-size: 16px;
  font-weight: 600;
  border: 2px solid rgba(0, 0, 0, 0.3);
  border-radius: 25px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  font-family: 'SimSun', 'STSong', serif;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(0, 0, 0, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.nav-link.active {
  background: rgba(0, 0, 0, 0.1);
  border-color: rgba(0, 0, 0, 0.5);
}

/* 当背景较暗时，切换导航样式以保证可读性 */
body.bg-dark .nav-link {
  color: #ffffff;
  background: rgba(0, 0, 0, 0.35);
  border-color: rgba(255, 255, 255, 0.18);
}

body.bg-dark .nav-link:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 12px rgba(255,255,255,0.04);
}

body.bg-dark .nav-link.active {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.3);
}

body.bg-dark .language-toggle {
  color: #ffffff;
  background: rgba(0,0,0,0.35);
  border-color: rgba(255,255,255,0.18);
}

body.bg-dark .back-button,
body.bg-dark .back-link {
  color: #ffffff;
  background: rgba(0,0,0,0.25);
  border-color: rgba(255,255,255,0.12);
}

/* 语言切换按钮 */
.language-toggle {
  position: fixed;
  top: 30px;
  right: 30px;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(0, 0, 0, 0.3);
  color: #2c2c2c;
  padding: 10px 20px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  border-radius: 25px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  font-family: 'SimSun', 'STSong', serif;
}

.language-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(0, 0, 0, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* 页脚致谢 */
.site-footer {
  max-width: 1200px;
  margin: 60px auto 40px;
  padding: 30px;
  text-align: center;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(10px);
  color: #2c2c2c;
  font-family: 'SimSun', 'STSong', serif;
  line-height: 1.8;
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0;
  word-wrap: break-word;
  overflow-wrap: break-word;
  font-size: inherit;
}