body {
  margin: 0;
  font-family: 'Helvetica Neue', sans-serif;
  background: #fdfdfd;
  overflow: hidden;
  color: #333;
}

#page-header {
  position: fixed;
  top: 0;
  width: 100%;
  height: 60px;
  background: rgba(255, 255, 255, 0.95);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 5vw;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  z-index: 1000;
}

#page-header .left {
  display: flex;
  align-items: center;
}

.logo {
  height: 40px;
  margin-right: 10px;
  border-radius: 4px;
}

.school-name {
  font-size: 18px;
  font-weight: bold;
  color: #222;
}

#music-toggle {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  background-color: rgba(240, 240, 240, 0.6);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  line-height: 40px;
  text-align: center;
}

.section {
  padding: 80px 10vw 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.section h1 {
  font-size: 2.2rem;
  margin: 20px 0 10px;
  color: #222;
}

.section p {
  width: 95%;
  font-size: 1.1rem;
  line-height: 1.8;
  color: #444;
  text-align: justify; /* 两端对齐 */
  text-justify: inter-word; /* 字间距调整 */
}

.main-image,
.section-image {
  display: block;
  margin: 0 auto 20px;
  max-width: 800px;     /* 统一最大宽度 */
  width: 90%;           /* 在小屏幕下也有弹性 */
  height: auto;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.section:nth-child(even) {
  background: #f9f9f9;
}

.section:nth-child(odd) {
  background: #ffffff;
}

.section5 .content-box {
  text-align: center;
}

.section5 .content-box p {
  text-align: center;
}

.section1 .content-box {
  text-align: center;
}

.section1 .content-box p {
  text-align: center;
}