* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  margin-bottom: 15px;
}

#hkbU-logo, #science-logo {
  height: auto;
  max-width: 300px;
}

#science-logo {
  border-left: 2px solid #003D79;
  padding-left: 20px;
}

.chat-frame {
  width: 100%;
  max-width: 100%;
  border: 1px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  background-color: #ffffff;
}

/* iframe占满整个chat-frame */
.chat-frame iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* 移动端专项优化 */
@media (max-width: 768px) {
  .container {
      padding: 5px;
  }

  .logo-container {
      flex-direction: column;
      gap: 10px;
      margin-bottom: 10px;
  }

  #hkbU-logo, #science-logo {
      max-width: 50vw; /* logo缩小到屏幕宽度的一半 */
  }

  #science-logo {
      border-left: none;
      padding-left: 0;
  }

  .chat-frame {
      width: 100%;
      max-width: 100vw;
      border-radius: 0; /* 小屏幕时可以去掉圆角，更充分利用空间 */
      border-left: none;
      border-right: none;
  }
}

/* 更小屏幕（<480px）进一步优化 */
@media (max-width: 480px) {
  #hkbU-logo, #science-logo {
      max-width: 70vw; /* 小屏幕时进一步缩小logo */
  }

  .chat-frame {
      box-shadow: none; /* 移除阴影，降低视觉负担 */
  }
}