video.banner {
  width: 100%;
}

body {
  margin: 0;
  font-family: 'Open Sans', sans-serif;
  font-size: 20px;
  line-height: 1.5;
  color: #363636;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.centered {
  text-align: center;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
    monospace;
}

a {
  color: #3273dc;
  cursor: pointer;
  text-decoration: none;
}

ul {
  font-size: 16px;
}

.flex {
  display: flex;
}

.column-flex {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.flex-gap {
  gap: 8px;
}

button {
  outline: none;
  position: relative;
  display: inline-block;
  white-space: nowrap;
  text-align: center;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.645, 0.045, 0.355, 1);
  user-select: none;
  touch-action: manipulation;
  font-size: 16px;
  line-height: 1.5;
  height: 40px;
  color: #fff;
  background: #363636;
  border-radius: 40px;
  padding-inline-start: 20px;
  padding-inline-end: 20px;
}

button:hover {
  background: #000;
}

h1 {
  font-size: 40px;
  margin-bottom: 0.5em;
  font-weight: 600;
}

h2 {
  font-size: 44px;
  margin-bottom: 0em;
}

h3 {
  font-size: 36px;
  margin-bottom: 0em;
  margin-top: 1.5em;
}

#title-flex {
  text-align: center;
  max-width: 960px;
  padding: 0 16px;
  row-gap: 8px;
}

#abstract-flex {
  max-width: 960px;
  padding: 0 16px;
}

#sections {
  width: calc(100vw - 16px);
  max-width: 1280px;
}

#sections h3,
#sections p {
  width: 100%;
  padding: 0 16px;
  overflow-wrap: break-word;
  box-sizing: border-box;
}

.responsive-image-container {
  max-width: 100%;
  overflow: hidden;
}

.responsive-image-container img {
  width: 100%;
  height: auto;
  display: block;
  /* Ensure the image is displayed as a block element */
  max-width: none;
  /* Reset the max-width property */
}

.video-container {
  overflow: hidden;
}

.video-container>video {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  clip-path: inset(2px);
  border-radius: 20px;
}

.video-slider {
  width: 100%;
}

.image-slider {
  position: relative;
  width: 1200px;
  height: 700px;
  overflow: hidden;
  margin: 0 auto;
}

.image-slider img {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.5s;
}

.image-slider img.active {
  opacity: 1;
}

.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.5);
  color: #fff;
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  z-index: 10;
}

.slider-btn.left { left: 10px; }
.slider-btn.right { right: 10px; }

/* 圆点容器放到图片下方 */
.slider-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 10px;   /* 和图片间距 */
}

.slider-dots span {
  display: inline-block;
  width: 12px;
  height: 12px;
  background: gray;     /* 未选中颜色 */
  border-radius: 50%;
  cursor: pointer;
}

.slider-dots span.active {
  background: black;    /* 当前图片颜色 */
}

#sections h4,
#sections h5,
#sections h6 {
  width: 100%;          /* 跟随父容器宽度 */
  padding: 0 16px;
  margin-top: 1.2em;
  margin-bottom: 0.5em;
  overflow-wrap: break-word;
  box-sizing: border-box;
  font-size: 24px;      /* 可根据需要调整 */
  font-weight: 400;     /* 普通文字 */
  text-align: justify;     /* 默认靠左 */
}

/* 可选居中 */
#sections h4.centered,
#sections h5.centered,
#sections h6.centered {
  text-align: center;
}