/* ═══════════════════════════════════════════════════
   动画关键帧
   ═══════════════════════════════════════════════════ */

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideDown {
  from { opacity: 0; max-height: 0; }
  to   { opacity: 1; max-height: 600px; }
}

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

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.05); }
}

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

/* 应用动画 */
.animate-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--anim-enter), transform var(--anim-enter);
}
.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 悬停动画 */
.card, .stat-card, .repo-link, .nav-button, button, .asset-item, .file-tree-item, .commit-item, .data-table tbody tr {
  transition: all var(--anim-normal);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.repo-link:hover, .nav-button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.data-table tbody tr:hover {
  background: var(--accent-glow);
}

.file-tree-item:hover, .commit-item:hover, .asset-item:hover {
  background: var(--accent-glow);
}

.asset-item:hover {
  transform: translateX(4px);
  border-color: var(--accent);
}

.release-title::after {
  content: ' ↗';
  font-size: 0.7rem;
  opacity: 0;
  transition: opacity var(--anim-fast);
}
.release-title:hover::after {
  opacity: 1;
}

/* 骨架屏 */
.skeleton-line {
  background: linear-gradient(90deg, rgba(255,255,255,0.04) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.04) 75%);
  background-size: 200px 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 6px;
}

/* 加载动画 */
.spinner {
  width: 40px; height: 40px;
  border: 4px solid rgba(255,255,255,0.12);
  border-top-color: var(--orange);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}