.accordion {
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  background-color: #fff;
  border-radius: 6px;
  overflow: hidden;
  border: none;
}

/* accordion-item 去掉边框，改用标题底部线区分 */
.accordion-item {
  margin: 0;
  padding: 0;
  border: none;
  display: block;
}

/* 标题底部分隔线，微妙区分 */
.accordion-header {
  all: unset;
  box-sizing: border-box;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 16px 25px;
  font-size: 16px;
  font-weight: 600;
  color: #222;
  background-color: #fafafa; /* 轻微灰色背景，区分白色主体 */
  cursor: pointer;
  user-select: none;
  transition: background-color 0.25s ease, color 0.25s ease;
  border-bottom: 1px solid #ddd; /* 标题下边框分隔 */
  border-radius: 0;
  position: relative;
}

.accordion-header:hover {
  background-color: #f0f8ff;
  color: #0073e6;
}

.accordion-header[aria-expanded="true"] {
  background-color: #e6f0ff;
  color: #005bb5;
  border-bottom-color: #0073e6; /* 展开时边框颜色变化 */
}

.accordion-header::after {
  content: "›";
  font-size: 18px;
  color: #999;
  transition: transform 0.3s ease, color 0.3s ease;
  transform-origin: center;
  pointer-events: none;
}

.accordion-header[aria-expanded="true"]::after {
  transform: rotate(90deg);
  color: #0073e6;
}

.accordion-content {
  display: none;
  padding: 16px 25px;
  background-color: #fff;
  color: #444;
  font-size: 15px;
  line-height: 1.5;
  animation: fadeIn 0.3s ease forwards;
}

.accordion-content.active,
.accordion-content[style*="display: block"] {
  display: block;
}

.accordion-content p {
  all: unset;
  display: block;
  margin: 0 0 1em 0;
  font-size: 15px;
  line-height: 1.5;
  color: #444;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}