/* ============================================================
   宇宙星系轮换背景  galaxy-bg.css（记忆海同款样式）
   背景：四张星系图交叉淡入 + 缓慢缩放，外加透明遮罩
   兼容：Chrome / Edge / Firefox / Safari / Opera / IE9+
        IE8 及更早通过页面内条件注释做静态兜底
   层级：galaxy-bg(0) < bg-veil(1) < 黄色粒子canvas(2)
        < 导航(11) < 左上角logo(999)
   ============================================================ */

/* ---------- 1. 星系背景容器：固定全屏 ---------- */
#galaxy-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
  background: #02060f;
}

/* ---------- 2. 四张星系图：交叉淡入 + 轻微缩放 ---------- */
#galaxy-bg .galaxy-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
  opacity: 0;
  -webkit-animation: galaxyRotate 32s infinite;
     -moz-animation: galaxyRotate 32s infinite;
       -o-animation: galaxyRotate 32s infinite;
          animation: galaxyRotate 32s infinite;
}

/* 负延迟错开，各显示约 8 秒；第一张默认可见做静态兜底 */
#galaxy-bg .galaxy-slide:nth-child(1) {
  -webkit-animation-delay: 0s;
     -moz-animation-delay: 0s;
       -o-animation-delay: 0s;
          animation-delay: 0s;
  opacity: 1;
}
#galaxy-bg .galaxy-slide:nth-child(2) {
  -webkit-animation-delay: -24s;
     -moz-animation-delay: -24s;
       -o-animation-delay: -24s;
          animation-delay: -24s;
}
#galaxy-bg .galaxy-slide:nth-child(3) {
  -webkit-animation-delay: -16s;
     -moz-animation-delay: -16s;
       -o-animation-delay: -16s;
          animation-delay: -16s;
}
#galaxy-bg .galaxy-slide:nth-child(4) {
  -webkit-animation-delay: -8s;
     -moz-animation-delay: -8s;
       -o-animation-delay: -8s;
          animation-delay: -8s;
}

/* ---------- 3. 关键帧：淡入淡出 + 缓慢 Ken Burns 缩放 ---------- */
@-webkit-keyframes galaxyRotate {
  0%   { opacity: 0; -webkit-transform: scale(1.06); }
  4%   { opacity: 1; }
  25%  { opacity: 1; -webkit-transform: scale(1); }
  29%  { opacity: 0; }
  100% { opacity: 0; -webkit-transform: scale(1.06); }
}
@-moz-keyframes galaxyRotate {
  0%   { opacity: 0; transform: scale(1.06); }
  4%   { opacity: 1; }
  25%  { opacity: 1; transform: scale(1); }
  29%  { opacity: 0; }
  100% { opacity: 0; transform: scale(1.06); }
}
@-o-keyframes galaxyRotate {
  0%   { opacity: 0; transform: scale(1.06); }
  4%   { opacity: 1; }
  25%  { opacity: 1; transform: scale(1); }
  29%  { opacity: 0; }
  100% { opacity: 0; transform: scale(1.06); }
}
@keyframes galaxyRotate {
  0%   { opacity: 0; transform: scale(1.06); }
  4%   { opacity: 1; }
  25%  { opacity: 1; transform: scale(1); }
  29%  { opacity: 0; }
  100% { opacity: 0; transform: scale(1.06); }
}

/* ---------- 4. 透明遮罩：轻微压暗背景，突出前景 ---------- */
#bg-veil {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  background:
    radial-gradient(ellipse at center, rgba(4, 10, 24, 0.10), rgba(2, 6, 15, 0.36) 82%),
    rgba(4, 10, 24, 0.16);
}

/* ---------- 5. 原 banner 透明，并隐藏旧轮播画面与控件 ---------- */
#banner {
  background: transparent !important;
}
#fwslider .slide,
#fwslider .timers,
#fwslider .slidePrev,
#fwslider .slideNext {
  display: none !important;
}

/* ---------- 6. 页脚版权：提升到背景之上并改为浅色 ---------- */
body > p {
  position: relative;
  z-index: 2;
  color: #d6e0ee;
  padding: 12px 22px;
}
body > p a {
  color: #9fc3e8;
}

/* ---------- 7. 响应式 ---------- */
@media only screen and (max-width: 768px) {
  body > p {
    font-size: 10px;
    line-height: 1.7;
    padding: 10px 12px;
  }
}
@media only screen and (max-width: 480px) {
  body > p {
    font-size: 9px;
    padding: 8px 10px;
  }
}

/* ---------- 8. 减少动态效果：静态显示第一张 ---------- */
@media (prefers-reduced-motion: reduce) {
  #galaxy-bg .galaxy-slide {
    -webkit-animation: none;
       -moz-animation: none;
         -o-animation: none;
            animation: none;
  }
  #galaxy-bg .galaxy-slide:first-child {
    opacity: 1;
  }
}