body {
  font-family: "Inter", sans-serif;
  line-height: 1.6;
  color: #222;
  background: #fafafa;
  margin: 0;
  padding: 0;
}

header {
  text-align: center;
  padding: 80px 20px 40px;
  background: white;
}

h1 {
  font-size: 2.2em;
  margin-bottom: 0.3em;
}

.buttons .btn {
  background: #0b5fff;
  color: white;
  padding: 10px 18px;
  margin: 0 5px;
  border-radius: 8px;
  text-decoration: none;
}
.buttons .btn:hover {
  background: #003ecb;
}

section {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

h2 {
  border-left: 4px solid #0b5fff;
  padding-left: 10px;
}

img {
  width: 100%;
  border-radius: 10px;
  margin-top: 10px;
}
img.small {
  width: 40%;
  display: block;
  margin: 0 auto; /* 居中 */
}

footer {
  text-align: center;
  font-size: 0.9em;
  padding: 20px;
  color: #555;
}

.teaser {
  width: 80%;           /* 图片宽度占页面宽度的80% */
  max-width: 900px;     /* 最大宽度 */
  border-radius: 10px;  /* 圆角 */
  margin: 20px auto;    /* 上下留白、水平居中 */
  display: block;       /* 让图片在中间显示 */
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);  /* 微弱阴影 */
}