/* 自定义滚动条样式，适配 Butterfly 主题 */

/* Chrome, Edge, Safari */
*::-webkit-scrollbar {
  width: 8px;
  height: 8px;
  background: transparent;
}
*::-webkit-scrollbar-thumb {
  background: #49b1f5;
  border-radius: 6px;
  transition: background 0.3s;
}
*::-webkit-scrollbar-thumb:hover {
  background: #2878b5;
}
*::-webkit-scrollbar-track {
  background: transparent;
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: #49b1f5 transparent;
}

/* 滚动条适配暗色模式 */
@media (prefers-color-scheme: dark) {
  *::-webkit-scrollbar-thumb {
    background: #2878b5;
  }
  * {
    scrollbar-color: #2878b5 transparent;
  }
}

/* 文章导航卡片样式 - 美化版 */
.article-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 25px;
  margin: 40px 0;
  padding: 20px 0;
}

.nav-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 25%, #f093fb 50%, #f5576c 75%, #ff6b6b 100%);
  background-size: 400% 400%;
  animation: gradientShift 8s ease infinite, cardFadeIn 0.6s ease-out forwards;
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 15px 35px rgba(102, 126, 234, 0.15);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-card:nth-child(1) { animation-delay: 0.1s; }
.nav-card:nth-child(2) { animation-delay: 0.2s; }
.nav-card:nth-child(3) { animation-delay: 0.3s; }

/* 卡片背景装饰 */
.nav-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(from 0deg, transparent, rgba(255, 255, 255, 0.1), transparent, rgba(255, 255, 255, 0.05), transparent);
  animation: rotate 20s linear infinite;
  opacity: 0.6;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.nav-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

/* 悬停效果 */
.nav-card:hover {
  transform: translateY(-10px) scale(1.03);
  box-shadow: 0 30px 60px rgba(102, 126, 234, 0.3);
  border-color: rgba(255, 255, 255, 0.3);
}

.nav-card:hover::before {
  opacity: 1;
  transform: scale(1.2);
  animation-duration: 10s;
}

.nav-card:hover::after {
  opacity: 1;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.08) 100%);
}

/* 添加卡片边缘光效 */
.nav-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
  opacity: 0;
  transition: all 0.4s ease;
  border-radius: 20px;
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.1);
}

/* 卡片内容 */
.nav-card h3 {
  color: #FFFFFF;
  margin: 0 0 20px 0;
  font-size: 1.8em;
  font-weight: 800;
  position: relative;
  z-index: 2;
  letter-spacing: 1px;
  background: linear-gradient(45deg, #FFFFFF, #F0F8FF, #FFFFFF);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titleGlow 4s ease-in-out infinite;
  text-transform: uppercase;
}

@keyframes titleGlow {
  0%, 100% {
    background-position: 0% 50%;
    filter: brightness(1);
  }
  50% {
    background-position: 100% 50%;
    filter: brightness(1.3);
  }
}

.nav-card p {
  color: rgba(255, 255, 255, 0.95);
  margin: 0 0 25px 0;
  line-height: 1.7;
  position: relative;
  z-index: 2;
  font-size: 1.05em;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* 链接按钮 */
.nav-link {
  display: inline-flex;
  align-items: center;
  color: white;
  text-decoration: none;
  font-weight: 600;
  padding: 14px 28px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 35px;
  transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  z-index: 2;
  backdrop-filter: blur(20px);
  border: 2px solid rgba(255, 255, 255, 0.15);
  font-size: 0.95em;
  letter-spacing: 0.8px;
  overflow: hidden;
  text-transform: uppercase;
  font-weight: 700;
}

.nav-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.8s ease;
}

.nav-link::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: all 0.6s ease;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateX(10px) scale(1.08);
  color: white;
  text-decoration: none;
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.3);
  border-color: rgba(255, 255, 255, 0.4);
  letter-spacing: 1.2px;
}

.nav-link:hover::before {
  left: 100%;
}

.nav-link:hover::after {
  width: 300px;
  height: 300px;
}

/* 添加音乐主题装饰 */
.nav-card h3::before {
  content: '♪';
  display: inline-block;
  font-size: 1.2em;
  margin-right: 12px;
  vertical-align: middle;
  transition: all 0.4s ease;
  animation: musicNote 3s ease-in-out infinite;
}

@keyframes musicNote {
  0%, 100% {
    transform: rotate(0deg) scale(1);
  }
  25% {
    transform: rotate(-10deg) scale(1.1);
  }
  75% {
    transform: rotate(10deg) scale(1.1);
  }
}

.nav-card:hover h3::before {
  transform: rotate(360deg) scale(1.3);
  animation-duration: 1s;
}

/* 添加卡片装饰元素 */
.nav-card::before {
  content: '';
  position: absolute;
  top: 15px;
  right: 15px;
  width: 30px;
  height: 30px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  opacity: 0.6;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.8;
  }
}



@keyframes gradientShift {
  0% {
    background-position: 0% 0%;
  }
  25% {
    background-position: 100% 0%;
  }
  50% {
    background-position: 100% 100%;
  }
  75% {
    background-position: 0% 100%;
  }
  100% {
    background-position: 0% 0%;
  }
}

/* 卡片进入动画 */
@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}



/* 添加卡片内容的光晕效果 */
.nav-card h3,
.nav-card p {
  position: relative;
}

.nav-card h3::after,
.nav-card p::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.nav-card:hover h3::after,
.nav-card:hover p::after {
  opacity: 1;
}

/* 响应式优化 */
@media (max-width: 768px) {
  .article-nav {
    grid-template-columns: 1fr;
    gap: 20px;
    margin: 30px 0;
  }
  
  .nav-card {
    padding: 25px;
    border-radius: 15px;
  }
  
  .nav-card h3 {
    font-size: 1.5em;
  }
  
  .nav-card p {
    font-size: 1em;
  }
  
  .nav-link {
    padding: 10px 20px;
    font-size: 0.9em;
  }
}

/* 添加加载动画 */
@keyframes shimmer {
  0% {
    background-position: -200px 0;
  }
  100% {
    background-position: calc(200px + 100%) 0;
  }
}

.nav-card.loading {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200px 100%;
  animation: shimmer 1.5s infinite;
}

/* 暗色模式适配 */
@media (prefers-color-scheme: dark) {
  .nav-card {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 25%, #8e44ad 50%, #9b59b6 75%, #e74c3c 100%);
    background-size: 400% 400%;
  }
  
  .nav-card h3 {
    background: linear-gradient(45deg, #FFFFFF, #F0F8FF, #FFFFFF);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.8em;
    font-weight: 800;
  }
  
  .nav-card:hover {
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5);
  }
  
  .nav-card.loading {
    background: linear-gradient(90deg, #2c3e50 25%, #34495e 50%, #2c3e50 75%);
  }
  
  .nav-link {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.1);
  }
  
  .nav-link:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.25);
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .article-nav {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .nav-card {
    padding: 20px;
  }
  
  .nav-card h3 {
    font-size: 1.2em;
  }
}