* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: "Arial", sans-serif;
  background: linear-gradient(50deg, #33CCCC, #00CCFF);
  color: #333;
  text-align: center;
  padding: 0px;height: 100vh;
}

video {
  height: 100vh;  /* 高度不超过视口 */
  display: block; */
}

.container {
  width: 70%;
  float: right;
}
.container li {list-style-type: none;margin-top: 80px;}
.container li img {background: #FFF;    border-radius: 100px;    padding: 0px 50px; width: 700px;}
.container span {font-size: 24px;    background: #FF6600;    padding: 10px 30px;    color: #fff;    border-radius: 50px;}

h1 {
font-size: 35px;
    margin-bottom: 50px;
    color: #FFF;margin-top: 45px;
}
.sub-title {
font-size: 22px;
    margin-bottom: 30px;
    color: #660000;
    margin-top: 20px;
}
.card-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.version-card {
  background: white;
  border-radius: 0px;
  padding: 30px 20px 30px 20px;
  width: 320px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  transition: 0.3s;
  cursor: pointer;  border: 5px solid transparent;margin-right: 20px;    margin-left: 20px;
}
.version-card.selected {
  border: 5px solid #FF6600;
}


.version-card img {
  width: 100%;
  height: 220px;margin-top: 30px;
}
.version-card h2 {
  font-size: 1.8rem;
  margin: 10px 0 5px;
}
.version-card p {color: #999999;    font-size: 20px;    font-weight: 600;     margin-top: 10px;}
.start-button {
margin-top: 70px;
    padding: 20px 60px;
    background: #FF6600;
    border: none;
    color: white;
    font-size: 45px;
    cursor: pointer;
    transition: background 0.3s;
    border-radius: 0.5rem; 
}
.start-button i {    margin-left: 20px;}
.start-button:hover {
  background: linear-gradient(to right, #ff3366, #ff66aa);
}
@media (max-width: 768px) {
  .version-card {
    width: 90%;
  }
}

/* 新增样式 */
.info-section {
  margin-top: 60px;
  text-align: center;
}
.info-section h2 {
  font-size: 24px;
  margin-bottom: 30px;
}
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
  gap: 20px;
  padding: 0 10px;
}
.info-card {
  background: #fff;
  border-radius: 0px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: transform 0.3s;
}
.info-card:hover {
  transform: translateY(-0px);
}
.info-card img {
  width: 100%;
  object-fit: cover;
  border-radius: 10px;
}
.info-card h3 {
  font-size: 18px;
  margin: 10px 0;
}
.info-card p {
font-size: 16px;
    color: #555;
    line-height: 1.6;
    text-align: justify;
    margin-top: 10px;
}

.mbtitou {   padding: 15px 0px 10px 0px;   background: #1c7dc7;    width: 100%;    position: absolute;    top: 0;    left: 0;    text-align: center;}
.mbtitou li {color: #fff;    font-size: 28px;  display: inline-flex;  overflow: hidden;    }
.mbtitou li img {width: 35px;height:35px;margin-right: 10px;}
.mbtitou li span {line-height: 35px;}

.mbtidi {    background: #000;    width: 100%;    position: absolute;    margin-bottom: 0;    left: 0;padding-bottom: 20px;    padding-top: 20px;    margin-top: 20px;}
.mbtidi p {text-align: center;    line-height: 20px;color: #fff;    font-size: 16px;}
.mbtidi a {color: #CCCCCC;    font-size: 12px;}

@media (max-width: 768px) {

.mbtidi {    background: #000;    width: 100%;    position: absolute;    margin-bottom: 0;    left: 0;padding-bottom: 10px;    padding-top: 10px;margin-top: 15px;}
.mbtidi p {text-align: center;    line-height: 20px;color: #fff;    font-size: 16px;}
.mbtidi a {color: #fff;    font-size: 12px;}

}


.retrieve-button {
    position: fixed;
    right: 2rem;
    bottom: 1.5rem;
    width: 120px;
    height: 120px;
    background-color: #8663c921;
    border-radius: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.retrieve-button .retrieve-button-inner {
    height: 100px;
    width: 100px;
    background: #8663C9;
    border-radius: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFF;
    font-weight: 600;
    font-size: 20px;
    line-height: 15px;
    cursor: default;
}
.retrieve-button .retrieve-button-inner p {  text-align: center;    line-height: 28px;    width: 45px;}