/* ═══════════════════════════════════════════
   Motion — 动效层（在 layout.css 之后加载，级联覆盖）
   编排原则：expo-out 入场 / 短促微反馈 / 全程可降级
   ═══════════════════════════════════════════ */

/* ── 页面切换：上浮 + 渐显（替代纯淡入）── */
@keyframes pageIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.page.active { animation: pageIn 0.55s var(--ease-emph); }

/* ── 滚动渐入升级（类名契约不变，曲线与位移精修）── */
.fade-up, .fade-left, .fade-right, .fade-in {
  transition: opacity 0.9s var(--ease-emph), transform 0.9s var(--ease-emph);
  will-change: opacity, transform;
}
.fade-up { transform: translateY(32px); }
.fade-left { transform: translateX(-32px); }
.fade-right { transform: translateX(32px); }
.fade-up.in, .fade-left.in, .fade-right.in { transform: none; }

/* ── Hero 主图 Ken Burns（10s 与轮播同周期，极轻呼吸）── */
@keyframes heroKB {
  from { transform: scale(1); }
  to   { transform: scale(1.055); }
}
.hero__slide { will-change: transform, opacity; }
.hero__slide.active { animation: heroKB 10.5s linear forwards; }

/* ── Hero 标题行遮罩入场（motion.js 注入 .hero-line 结构）── */
.hero-line { display: block; overflow: hidden; }
.hero-line-inner { display: block; transform: translateY(110%); }
/* 无 GSAP / 降级时直接可见 */
.no-motion .hero-line-inner, .motion-done .hero-line-inner { transform: none; }

/* ── 骨架屏 shimmer ── */
@keyframes skelShimmer {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}
.skel {
  position: relative; overflow: hidden;
  background: var(--bg-soft);
  border-radius: var(--radius);
}
.skel::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(100deg, transparent 20%, rgba(255,255,255,0.55) 50%, transparent 80%);
  background-size: 200% 100%;
  animation: skelShimmer 1.6s linear infinite;
}
[data-theme="dark"] .skel::after {
  background: linear-gradient(100deg, transparent 20%, rgba(255,255,255,0.08) 50%, transparent 80%);
  background-size: 200% 100%;
}
.skel-card { aspect-ratio: 1; border-radius: var(--radius-lg); }

/* ── 漂浮拼贴慢速漂移（stylesFloat 子元素，motion.js 指派延迟）── */
@keyframes floatDrift {
  0%, 100% { transform: translateY(0) rotate(var(--rot, 0deg)); }
  50%      { transform: translateY(-12px) rotate(var(--rot, 0deg)); }
}
.float-drift { animation: floatDrift 7s var(--ease) infinite; animation-delay: var(--fd, 0s); will-change: transform; }

/* ── 生成中脉冲点（聊天/结果区等待态）── */
@keyframes pulseDot {
  0%, 80%, 100% { opacity: 0.25; transform: scale(0.85); }
  40%           { opacity: 1;    transform: scale(1); }
}
.pulse-dots { display: inline-flex; gap: 5px; align-items: center; }
.pulse-dots i {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--fg-muted);
  animation: pulseDot 1.2s ease-in-out infinite;
}
.pulse-dots i:nth-child(2) { animation-delay: 0.15s; }
.pulse-dots i:nth-child(3) { animation-delay: 0.3s; }

/* ── 按钮按下微反馈 ── */
.btn:active, .hero__capsule:active, .slider-all:active { transform: scale(0.97); }

/* ── 卡片悬浮精修：位移 + 阴影分层（配合 cards.css 边框态）── */
.card { transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease); }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }

/* ── 链接下划线滑动（导航/页内文本链）── */
.nav__links a::before {
  content: ''; position: absolute; left: 12px; right: 12px; bottom: 8px;
  height: 2px; background: currentColor; border-radius: 1px;
  transform: scaleX(0); transform-origin: left center;
  transition: transform 0.3s var(--ease-emph);
}
.nav__links a:hover::before { transform: scaleX(1); }
/* 当前页横杠由 navbar.css 的 ::after 常显，此处仅处理非当前页的悬停滑动 */
.nav__links a.active::before { content: none; }