*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: "Microsoft YaHei", sans-serif;
  background: #f2f5f9;
}
.header {
  height: 90px;
  background: #fff;
  border-bottom: 1px solid #e6e6e6;
  display: flex;
  align-items: center;
  padding: 0 20px;
}
.header img {
  height: 80px;
}
.nav {
  margin-left: auto;
  display: flex;
  gap: 15px;
  font-size: 14px;
}
.nav a {
  color: #333;
  text-decoration: none;
  line-height: 60px;
}
.container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 1200px;
  margin: 60px auto 0;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.left-panel, .right-panel {
  flex: 1 1 300px;
  min-width: 300px;
}
.left-panel {
  background: url('https://i.postimg.cc/bJC3wZ2s/Polestar-3.avif') no-repeat center/cover;
  min-height: 400px;
}
.right-panel {
  padding: 40px;
  display: flex;
  flex-direction: column;
}
.right-panel h1 {
  font-size: 24px;
  color: #333;
  margin-bottom: 20px;
}
.iframe-wrapper {
  position: relative;
  width: 100%;
  flex: 1 1 auto;
  padding-top: 56.25%;
  overflow: hidden;
}
.iframe-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}
.footer {
  text-align: center;
  font-size: 12px;
  color: #666;
  background: #f7f7f7;
  padding: 20px 0;
  margin-top: 20px;
}
.footer a {
  color: #666;
  text-decoration: none;
  margin: 0 5px;
}
.footer .licence {
  margin-top: 5px;
}
@media(max-width: 768px) {
  .nav {
    flex-wrap: wrap;
    gap: 10px;
  }
  .header, .nav a {
    line-height: normal;
  }
  .right-panel {
    padding: 20px;
  }
  .iframe-wrapper {
    padding-top: 75%;
  }
}