/* ===== 官网现代化动效样式（专业精致风格） ===== */

/* 滚动进场：默认隐藏 + 轻微下移，进入视口后淡入归位 */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s cubic-bezier(.16, 1, .3, 1),
              transform .7s cubic-bezier(.16, 1, .3, 1);
  will-change: opacity, transform;
}
.reveal.in {
  opacity: 1;
  transform: none;
}

/* 只淡入、不位移的变体（给带 hover 上浮的卡片用，避免 transform 冲突） */
.reveal-fade {
  opacity: 0;
  transition: opacity .7s cubic-bezier(.16, 1, .3, 1);
  will-change: opacity;
}
.reveal-fade.in { opacity: 1; }

/* Hero 大图缓慢缩放（Ken Burns），画面有呼吸感 */
@keyframes kenburns {
  from { transform: scale(1); }
  to   { transform: scale(1.08); }
}
.kenburns { animation: kenburns 22s ease-out forwards; }

/* 导航向下滚动后加柔和阴影 */
nav.scrolled { box-shadow: 0 4px 24px rgba(15, 23, 42, .06); }

/* 全站平滑滚动 */
html { scroll-behavior: smooth; }

/* 尊重系统"减少动画"偏好：关闭所有动效，保证可访问性 */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .reveal-fade { opacity: 1; transition: none; }
  .kenburns { animation: none; }
  html { scroll-behavior: auto; }
}