/**
 * 加载动画和骨架屏样式
 */

/* ========== 骨架屏基础样式 ========== */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 4px;
}

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

.skeleton-line {
  background: inherit;
  height: 16px;
  border-radius: 4px;
  margin-bottom: 8px;
}

/* ========== 骨架屏类型 ========== */
.skeleton-navbar {
  display: flex;
  gap: 15px;
  align-items: center;
  padding: 12px 20px;
}

.skeleton-news {
  padding: 10px;
}

/* ========== 加载状态 ========== */
.loading {
  position: relative;
  min-height: 50px;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid #f3f3f3;
  border-top: 2px solid #1abc9c;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ========== 错误状态 ========== */
.loading-error {
  text-align: center;
  padding: 20px;
  color: #d9534f;
}

.loading-error p {
  margin: 0 0 10px 0;
}

.retry-btn {
  background-color: #007bff;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: background-color 0.2s;
}

.retry-btn:hover {
  background-color: #0056b3;
}

/* ========== 淡入动画 ========== */
.fade-in {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-on-scroll.fade-in-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== 图片懒加载 ========== */
img[data-src] {
  opacity: 0;
  transition: opacity 0.3s;
}

img.lazy-loading {
  opacity: 0.5;
  filter: blur(5px);
}

img.lazy-loaded {
  opacity: 1;
  filter: blur(0);
}

img.lazy-error {
  opacity: 0.3;
  background-color: #f0f0f0;
}

/* ========== 加载旋转动画 ========== */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(26, 188, 156, 0.3);
  border-radius: 50%;
  border-top-color: #1abc9c;
  animation: spin 1s ease-in-out infinite;
}

.spinner-large {
  width: 40px;
  height: 40px;
  border-width: 4px;
}

/* ========== 脉冲动画 ========== */
.pulse {
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ========== 响应式优化 ========== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}