/* 基础样式重置 */
*, *:before, *:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}

article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
  display: block;
}

body {
  line-height: 1;
  background: #0a0a1a;
  overflow: hidden;
  color: #fff;
  font-family: 'Source Sans Pro', sans-serif;
  font-size: 15pt;
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1.75em;
}

ol, ul {
  list-style: none;
}

blockquote, q {
  quotes: none;
}

blockquote:before, blockquote:after,
q:before, q:after {
  content: '';
  content: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* 链接样式 */
a {
  transition: border-color 0.2s ease-in-out;
  border-bottom: dotted 1px;
  color: inherit;
  outline: 0;
  text-decoration: none;
}

a:hover {
  border-color: transparent;
}

/* 图标样式 */
.icon {
  text-decoration: none;
  position: relative;
}

.icon:before {
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  display: inline-block;
  font-style: normal;
  font-variant: normal;
  text-rendering: auto;
  line-height: 1;
  text-transform: none !important;
  font-family: 'Font Awesome 6 Pro';
  font-weight: 400;
}

.icon > .label {
  display: none;
}

.icon.solid:before {
  font-weight: 900;
}

.icon.brands:before {
  font-family: 'Font Awesome 6 Brands';
}

/* 主容器动画 */
@keyframes wrapper {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

#wrapper {
  animation: wrapper 3s forwards;
  height: 100%;
  left: 0;
  opacity: 0;
  position: fixed;
  top: 0;
  width: 100%;
}



#moon-bg {
  background: url('../../Image/moon.jpg') center center;
  background-size: cover;
  height: 100%;
  left: 0;
  opacity: 1;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: -3;
}

#bg {
  backface-visibility: hidden;
  background: url('https://au-ra.tos-cn-shanghai.volces.com/IMG_20251124_131227.png'), url('https://au-ra.tos-cn-shanghai.volces.com/IMG_20251218_234434.png'), url('https://au-ra.tos-cn-shanghai.volces.com/8.5%E5%AE%813.png');
  background-repeat: no-repeat;
  background-size: auto 70vh;
  background-position: 0 center, 50% center, 100% center;
  height: 70vh;
  left: 0;
  opacity: 1;
  position: fixed;
  top: 15vh;
  width: 100%;
  z-index: -1;
  transition: background-image 1s ease-in-out;
}

/* PC端和平板端: 3张图片并排,左右有边距 */
@media screen and (min-width: 1024px) {
  #bg {
    background-position: 5% center, 50% center, 95% center !important;
  }
}

/* 顶部导航栏 */
#top-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(10, 10, 26, 0.8);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 10px 20px;
  box-sizing: border-box;
}

#top-nav ul {
  display: flex;
  justify-content: center;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

#top-nav li {
  margin: 0 20px;
}

#top-nav a {
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  transition: all 0.3s ease;
  padding: 5px 10px;
  border-radius: 4px;
}

#top-nav a:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* 移动端导航栏适配 */
@media screen and (max-width: 736px) {
  #top-nav {
    padding: 8px 15px;
  }
  
  #top-nav li {
    margin: 0 10px;
  }
  
  #top-nav a {
    font-size: 12px;
    padding: 4px 8px;
  }
}

/* 遮罩层动画 */
@keyframes overlay {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

#overlay {
  display: none;
}

/* 主内容区 */
#main {
  height: 100%;
  left: 0;
  position: fixed;
  text-align: center;
  top: 0;
  width: 100%;
}

#main:before {
  content: '';
  display: inline-block;
  height: 100%;
  margin-right: 0;
  vertical-align: middle;
  width: 1px;
}

/* 头部动画 */
@keyframes header {
  0% {
    transform: translate3d(0,1em,0);
    opacity: 0;
  }
  100% {
    transform: translate3d(0,0,0);
    opacity: 1;
  }
}

@keyframes nav-icons {
  0% {
    transform: translate3d(0,1em,0);
    opacity: 0;
  }
  100% {
    transform: translate3d(0,0,0);
    opacity: 1;
  }
}

#header {
  animation: header 1s 2.25s forwards;
  backface-visibility: hidden;
  transform: translate3d(0,0,0);
  cursor: default;
  display: inline-block;
  opacity: 0;
  position: relative;
  text-align: center;
  top: -1em;
  vertical-align: middle;
  width: 90%;
}

#header h1 {
  font-size: 4.35em;
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 1em;
}

#header p {
  font-size: 1.25em;
  margin: 0.75em 0 0.25em 0;
  opacity: 0.75;
}

#header nav {
  margin: 1.5em 0 0 0;
}

#header nav li {
  animation: nav-icons 0.5s ease-in-out forwards;
  backface-visibility: hidden;
  transform: translate3d(0,0,0);
  display: inline-block;
  height: 5.35em;
  line-height: 5.885em;
  opacity: 0;
  position: relative;
  top: 0;
  width: 5.35em;
}

#header nav li:nth-child(1) { animation-delay: 2.5s; }
#header nav li:nth-child(2) { animation-delay: 2.75s; }
#header nav li:nth-child(3) { animation-delay: 3s; }
#header nav li:nth-child(4) { animation-delay: 3.25s; }
#header nav li:nth-child(5) { animation-delay: 3.5s; }
#header nav li:nth-child(6) { animation-delay: 3.75s; }
#header nav li:nth-child(7) { animation-delay: 4s; }
#header nav li:nth-child(8) { animation-delay: 4.25s; }
#header nav li:nth-child(9) { animation-delay: 4.5s; }
#header nav li:nth-child(10) { animation-delay: 4.75s; }

#header nav a {
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  -webkit-touch-callout: none;
  border: 0;
  display: inline-block;
}

#header nav a:before {
  transition: all 0.2s ease-in-out;
  border-radius: 100%;
  border: solid 1px #fff;
  display: block;
  font-size: 1.75em;
  height: 2.5em;
  line-height: 2.5em;
  position: relative;
  text-align: center;
  top: 0;
  width: 2.5em;
}

#header nav a:hover {
  font-size: 1.1em;
}

#header nav a:hover:before {
  background-color: rgba(255, 255, 255, 0.175);
  color: #fff;
}

#header nav a:active {
  font-size: 0.95em;
  background: none;
}

#header nav a:active:before {
  background-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

#header nav a span {
  display: none;
}

/* 页脚 */
#footer {
  background-image: linear-gradient(top, rgba(0,0,0,0), rgba(0,0,0,0.5) 75%);
  bottom: 0;
  cursor: default;
  height: auto;
  min-height: 6em;
  padding: 2em 0 1em;
  left: 0;
  position: absolute;
  text-align: center;
  width: 100%;
}

#footer .copyright {
  display: inline-block;
  line-height: 1.8;
}

/* 响应式设计 - 大屏幕 */
@media screen and (min-width: 737px) {
  #bg {
    background: url('../../Image/12.24/IMG_20251124_131227.png'), url('../../Image/12.24/IMG_20251218_234434.png'), url('../../Image/12.24/8.5宁3.png');
    background-repeat: no-repeat;
    background-size: auto 70vh;
    background-position: 2vw center, 50% center, calc(98vw - auto) center;
    width: 100%;
    height: 70vh;
    top: 15vh;
    transition: background-image 1s ease-in-out;
  }
}

/* 手机端优化 - 小屏幕适配 */
@media screen and (max-width: 736px) {
  body {
    font-size: 13pt;
  }

  #moon-bg {
    background: url('../../Image/moon.jpg') center center;
    background-size: cover;
    height: 100%;
    top: 0;
  }

  #bg {
    background: url('https://au-ra.tos-cn-shanghai.volces.com/IMG_20251124_131227.png'), url('https://au-ra.tos-cn-shanghai.volces.com/IMG_20251218_234434.png'), url('https://au-ra.tos-cn-shanghai.volces.com/8.5%E5%AE%813.png');
    background-repeat: no-repeat;
    background-size: auto 70vh;
    background-position: 0 center, 50% center, 100% center;
    width: 100%;
    height: 70vh;
    top: 15vh;
    transition: background-image 1s ease-in-out;
  }



  #header {
    width: 95%;
    padding: 0 10px;
  }

  #header h1 {
    font-size: 2.5em;
    letter-spacing: -0.02em;
  }

  #header p {
    font-size: 1em;
    margin: 0.5em 0 0.25em 0;
  }

  #header nav {
    margin: 1em 0 0 0;
  }

  #header nav li {
    height: 4.5em;
    line-height: 4.885em;
    width: 4.5em;
    margin: 0 0.25em;
  }

  #header nav a:before {
    font-size: 1.5em;
    height: 2.2em;
    line-height: 2.2em;
    width: 2.2em;
  }

  #header nav a:hover,
  #header nav a:active {
    transform: scale(1.05);
  }

  #footer {
    height: auto;
    min-height: 4em;
    line-height: 1.5em;
    padding: 1.5em 0.5em 1em;
    font-size: 0.85em;
  }

  #footer .copyright {
    display: inline-block;
    line-height: 1.6;
  }

  #footer .copyright a {
    color: #fff;
    border-bottom: 1px dotted rgba(255,255,255,0.5);
  }
}
}

@media screen and (min-width: 1281px) {
  #bg {
    background: url('https://au-ra.tos-cn-shanghai.volces.com/IMG_20251124_131227.png'), url('https://au-ra.tos-cn-shanghai.volces.com/IMG_20251218_234434.png'), url('https://au-ra.tos-cn-shanghai.volces.com/8.5%E5%AE%813.png');
    background-repeat: no-repeat;
    background-size: auto 70vh;
    background-position: 0 center, 50% center, 100% center;
    width: 100%;
    height: 70vh;
    top: 15vh;
    transition: background-image 1s ease-in-out;
  }
}

@media screen and (min-width: 1681px) {
  #bg {
    background: url('https://au-ra.tos-cn-shanghai.volces.com/IMG_20251124_131227.png'), url('https://au-ra.tos-cn-shanghai.volces.com/IMG_20251218_234434.png'), url('https://au-ra.tos-cn-shanghai.volces.com/8.5%E5%AE%813.png');
    background-repeat: no-repeat;
    background-size: auto 70vh;
    background-position: 0 center, 50% center, 100% center;
    width: 100%;
    height: 70vh;
    top: 15vh;
    transition: background-image 1s ease-in-out;
  }
}