/* ================= 公共基础样式 ================= */
/* 图片自适应：保证小屏设备上按比例缩放，不溢出容器 */
img {
  max-width: 100%;
  height: auto;
}

/* ================= 页面结构样式 ================= */
/* 头部 Banner：通栏背景图 + 悬浮海淀教育 Logo（设计稿画布 2244×616，等比还原） */
.header .banner {
  position: relative;
  width: 100%;
  overflow: hidden;
}
.header .banner .banner-bg {
  display: block;
  width: 100%;
}
.header .banner .banner-logo {
  position: absolute;
  /* 设计稿定位换算：left 552/2244 ≈ 24.6%，top 37/616 ≈ 6%，宽度 252/2244 ≈ 11.23% */
  left: 24.6%;
  top: 6%;
  width: 11.23%;
  max-width: 252px;
}

/* 图片直播模块：浅蓝底纹背景 + “开学现场 图片直播”标题 + 直播封面卡片（设计稿画布 1927×845，等比还原） */
.part_1 .live {
  position: relative;
  width: 100%;

  background: url(../images/live-bg.png) no-repeat center top / 100% 100%;
  overflow: hidden;
}
.part_1 .live .live-title {
  width: 22.11%;
  margin: 0 auto;
  margin-top: 100px;
}
.part_1 .live .live-title img {
  display: block;
  width: 100%;
}
.part_1 .live .live-cover {
  width: 1200px;
  margin: 0 auto;
  padding: 40px;
  background-color: #fff;
  border-radius: 8px;
  margin-top: 20px;
}
.part_1 .live .live-cover img {
  display: block;
  width: 100%;
  border-radius: 8px;
}
.part_1 .live .live-cover .live-cover-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 40px;
  gap: 20px;
}
.part_1 .live .live-cover .live-cover-btn .live-cover-btn-item {
  cursor: pointer;
}

/* 开学动态模块：浅蓝底纹背景 + 标题图 + 半透明卡片容器 + 头条大图 + 新闻网格 + 查看更多（设计稿画布 1920×1816，PC 端按 1920px 基线等比还原） */
.part_2 .dynamic {
  position: relative;
  width: 100%;
  padding: 78px 20px 80px;
  background: url(../images/dynamic-bg.png) no-repeat center top / cover;
  overflow: hidden;
}
.part_2 .dynamic .dynamic-title {
  width: 436px;
  max-width: 100%;
  margin: 0 auto 115px;
}
.part_2 .dynamic .dynamic-title img {
  display: block;
  width: 100%;
}
.part_2 .dynamic .dynamic-card {
  max-width: 1196px;
  margin: 0 auto;
  padding: 20px;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 20px;
}
.part_2 .dynamic .dynamic-card .dynamic-feature {
  display: flex;
  gap: 24px;
  /* align-items: flex-start; */
  padding: 20px;
  background-color: #ffffff;
  border-radius: 20px;
  margin-bottom: 24px;
}
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-image {
  flex: 0 0 auto;
  width: 48%;
  max-width: 554px;
  display: block;
  overflow: hidden;
  border-radius: 12px;
}
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-image img {
  display: block;
  width: 100%;
  transition: transform 0.4s ease;
}
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-body {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
}
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-body .feature-badge {
  align-self: flex-start;
  padding: 4px 12px;
  background-color: #e60012;
  color: #ffffff;
  font-size: 14px;
  line-height: 1;
  border-radius: 4px;
}
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-body .feature-title {
  margin: 0;
  font-size: 24px;
  line-height: 1.4;
  font-weight: 700;
  color: #333333;
}
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-body .feature-title a {
  color: inherit;
  text-decoration: none;
}
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-body .feature-title a:hover {
  color: #0d62bd;
}
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-body .feature-summary {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: #666666;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-body .feature-meta {
  /* margin-top: auto; */
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 14px;
  color: #999999;
}
/* 时间图标：使用 CSS 绘制日历形状，避免引入 SVG 文件 */
.part_2 .dynamic .dynamic-card .meta-date {
  position: relative;
  /* padding-left: 20px; */
}
/* .part_2 .dynamic .dynamic-card .meta-date::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border: 1px solid #999999;
  border-radius: 2px;
  box-sizing: border-box;
} */
/* .part_2 .dynamic .dynamic-card .meta-date::after {
  content: "";
  position: absolute;
  left: 3px;
  top: calc(50% - 4px);
  width: 8px;
  height: 3px;
  border-left: 1px solid #999999;
  border-right: 1px solid #999999;
  box-sizing: border-box;
} */
.part_2 .dynamic .dynamic-card .dynamic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item {
  display: flex;
  flex-direction: column;
  background-color: #ffffff;
  border-radius: 20px;
  overflow: hidden;
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item .item-image {
  display: block;
  overflow: hidden;
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item .item-image img {
  display: block;
  width: 100%;
  aspect-ratio: 361 / 241;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item .item-image:hover img,
.part_2 .dynamic .dynamic-card .dynamic-feature .feature-image:hover img {
  transform: scale(1.05);
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item .item-body {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item .item-body .item-title {
  margin: 0;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  color: #333333;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item .item-body .item-title a {
  color: inherit;
  text-decoration: none;
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item .item-body .item-title a:hover {
  color: #0d62bd;
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item .item-body .item-summary {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #666666;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.part_2 .dynamic .dynamic-card .dynamic-grid .dynamic-item .item-body .item-meta {
  margin-top: auto;
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 13px;
  color: #999999;
}
.part_2 .dynamic .dynamic-card .dynamic-more {
  display: block;
  width: fit-content;
  margin: 0 auto;
  padding: 14px 50px;
  background-color: #0d62bd;
  color: #ffffff;
  font-size: 16px;
  text-decoration: none;
  border-radius: 10px;
  transition: background-color 0.3s ease;
}
.part_2 .dynamic .dynamic-card .dynamic-more:hover {
  background-color: #0a4e99;
}

/* ================= 组件样式 ================= */
/* 页脚：主办信息 + 备案信息 */
.footer {
  padding: 32px;
  background-color: #0d62bd;
  display: flex;
  justify-content: center;
  gap: 20px;
  align-items: center;
  color: #fff;
  font-size: 14px;
  position: relative;
}
.footer .footer-shield img {
  width: 62px;
  height: 72px;
  display: block;
}
.footer .footer-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.footer .footer-info .footer-filing {
  display: flex;
  gap: 20px;
}
.footer .footer-info .footer-filing .footer-filing-link {
  display: flex;
  align-items: center;
  gap: 4px;
}
.footer .footer-placeholder {
  width: 62px;
}

/* ================= 开学指南模块 part_3 ================= */
.part_3 .guides {
  width: 100%;
  padding: 80px 20px 178px;
  background: linear-gradient(180deg, rgba(226, 239, 247, 0) 0%, #cfecfa 100%);
  overflow: hidden;
}

.part_3 .guides .guides-title {
  width: 439px;
  max-width: 100%;
  margin: 0 auto 42px;
}

.part_3 .guides .guides-title img {
  display: block;
  width: 100%;
  height: auto;
}

.part_3 .guides .guide-module {
  max-width: 1200px;
  margin: 0 auto 42px;
}

.part_3 .guides .guide-module:last-child {
  margin-bottom: 0;
}

/* 模块标题区 */
.part_3 .guides .guide-module .module-header {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 50px;
  margin-bottom: 10px;
}

.part_3 .guides .guide-module .module-header .module-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  flex-shrink: 0;
}

.part_3 .guides .guide-module .module-header .module-icon-blue {
  background-color: #0d62bd;
}

.part_3 .guides .guide-module .module-header .module-icon-red,
.part_3 .guides .guide-module .module-header .module-icon-teal {
  width: 44px;
  height: 44px;
}

.part_3 .guides .guide-module .module-header .module-icon-red {
  background-color: #c70915;
}

.part_3 .guides .guide-module .module-header .module-icon-teal {
  background-color: #62bdb4;
}

.part_3 .guides .guide-module .module-header .module-icon svg {
  display: block;
}

.part_3 .guides .guide-module .module-header h3 {
  margin: 0;
  font-size: 36px;
  font-weight: 400;
  color: #000000;
  font-family: "Source Han Sans CN", "Microsoft YaHei", "PingFang SC", sans-serif;
}

.part_3 .guides .guide-module .module-line {
  height: 1px;
  background-color: #dddddd;
  margin-bottom: 20px;
}

/* 模块内容区：海报 + 提示卡片 */
.part_3 .guides .guide-module .module-body {
  display: flex;
  gap: 16px;
  align-items: stretch;
}

.part_3 .guides .guide-module .module-poster {
  position: relative;
  width: 280px;
  flex-shrink: 0;
  border-radius: 20px;
  overflow: hidden;
  background-color: #f0f0f0;
}

.part_3 .guides .guide-module .module-poster img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.part_3 .guides .guide-module .module-poster .poster-text {
  position: absolute;
  left: 50%;
  bottom: 33px;
  transform: translateX(-50%);
  padding: 10px 12px;
  background-color: #ffffff;
  border-radius: 20px;
  text-align: center;
  box-sizing: border-box;
}

.part_3 .guides .guide-module .module-poster .poster-text-blue {
  width: 218px;
}

.part_3 .guides .guide-module .module-poster .poster-text-red,
.part_3 .guides .guide-module .module-poster .poster-text-teal {
  width: 267px;
}

.part_3 .guides .guide-module .module-poster .poster-text strong {
  display: block;
  font-size: 30px;
  font-weight: 400;
  color: #000000;
  line-height: 1.2;
  margin-bottom: 8px;
  white-space: nowrap;
}

.part_3 .guides .guide-module .module-poster .poster-text span {
  display: block;
  font-size: 14px;
  color: #000000;
  line-height: 1.4;
}

/* 提示卡片区域 */
.part_3 .guides .guide-module .module-tips {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 29px;
  padding: 20.91px;
  border-radius: 16px;
}

.part_3 .guides .guide-module .module-tips-blue {
  background-color: #2f7ec9;
}

.part_3 .guides .guide-module .module-tips-red {
  background-color: #c70915;
}

.part_3 .guides .guide-module .module-tips-teal {
  background-color: #62bdb4;
}

.part_3 .guides .guide-module .module-tips .tip-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 11px;
  background-color: #ffffff;
  border-radius: 10px;
  border: 1px solid #dddddd;
  box-sizing: border-box;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.part_3 .guides .guide-module .module-tips .tip-card:hover {
  /* transform: translateY(-4px); */
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.part_3 .guides .guide-module .module-tips .tip-card-wide {
  grid-column: 1 / -1;
}

.part_3 .guides .guide-module .module-tips .tip-card .tip-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.part_3 .guides .guide-module .module-tips .tip-card .tip-header .tip-chevron {
  display: block;
  width: 18px;
  height: 17px;
  flex-shrink: 0;
}

.part_3 .guides .guide-module .module-tips .tip-card .tip-header h4 {
  margin: 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.2;
}

.part_3 .guides .guide-module .module-tips-blue .tip-card .tip-header h4 {
  color: #0d62bd;
}

.part_3 .guides .guide-module .module-tips-red .tip-card .tip-header h4 {
  color: #c70915;
}

.part_3 .guides .guide-module .module-tips-teal .tip-card .tip-header h4 {
  color: #62bdb4;
}

.part_3 .guides .guide-module .module-tips .tip-card .tip-summary {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: #999999;
}
.part_3 .guides .guide-module .module-tips .tip-card .tip-summary-more {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: #999999;
  height: 0;
  overflow: hidden;
  interpolate-size: allow-keywords;
  transition: height 0.3s ease;
}

.part_3 .guides .guide-module .module-tips .tip-card .tip-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  font-size: 16px;
  text-decoration: none;
  transition: opacity 0.3s ease;
  cursor: pointer;
}

.part_3 .guides .guide-module .module-tips .tip-card .tip-more:hover {
  opacity: 0.8;
}

.part_3 .guides .guide-module .module-tips .tip-card .tip-more .tip-arrow {
  display: block;
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  transform: rotate(90deg);
  cursor: pointer;
}

.part_3 .guides .guide-module .module-tips-blue .tip-card .tip-more {
  color: #0d62bd;
}

.part_3 .guides .guide-module .module-tips-red .tip-card .tip-more {
  color: #c70915;
}

.part_3 .guides .guide-module .module-tips-teal .tip-card .tip-more {
  color: #62bdb4;
}

/* ================= 科学教育“做中学”模块 part_4（设计稿画布 1921×2713，内容区宽 1195px 居中） ================= */
.part_4 .science {
  width: 100%;
  overflow: hidden;
  font-family: "Source Han Sans CN", "Microsoft YaHei", "PingFang SC", sans-serif;
}
/* 内容区通用容器：1195px 限宽居中，两侧各留 20px 安全边距 */
.part_4 .science .science-section {
  width: 100%;
  max-width: 1235px;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}
/* 区块标题：40px 加粗蓝色（设计稿 Source Han Sans CN 900，#2F7EC9） */
.part_4 .science .section-title {
  margin: 0;
  font-size: 40px;
  font-weight: 900;
  line-height: 1.2;
  color: #2f7ec9;
  text-align: center;
}
/* 标题下通栏分割线：1px 蓝色实线（还原设计稿 5.svg / 2.svg） */
.part_4 .science .section-divider {
  height: 1px;
  margin-top: 23px;
  background-color: #2f7ec9;
}

/* 头图区：黄色渐变背景 + 主视觉图 + 导语 + 大标题 */
.part_4 .science .science-hero {
  padding: 83px 20px 50px;
  background: linear-gradient(180deg, #fbf450 0%, rgba(252, 243, 79, 0) 100%);
  text-align: center;
}
.part_4 .science .science-hero .hero-img {
  width: 497px;
  max-width: 100%;
}
.part_4 .science .science-hero .hero-intro {
  max-width: 900px;
  margin: 26px auto 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.5;
  color: #000000;
}
.part_4 .science .science-hero .hero-title {
  margin: 26px 0 0;
  font-size: 36px;
  font-weight: 500;
  line-height: 1.4;
  color: #000000;
}

/* 学段目标：胶囊选项卡 + 渐变内容卡片 */
.part_4 .science .science-goal {
  padding-top: 11px;
}
/* 选项卡容器：两个胶囊相互交叠（小学 519px 居左叠在上层，中学 758px 居右） */
.part_4 .science .goal-tabs {
  display: flex;
  gap: 20px;
  height: 54px;
  margin-top: 40px;
}
.part_4 .science .goal-tabs .goal-tab {
  height: 54px;
  padding: 0;
  border: none;
  border-radius: 999px;
  font-family: inherit;
  font-size: 28px;
  line-height: 54px;
  text-align: center;
  cursor: pointer;
  background-color: #dddddd;
  color: #333333;
  z-index: 1;
  transition:
    background-color 0.3s ease,
    color 0.3s ease;
}
.part_4 .science .goal-tabs .goal-tab-primary {
  width: 50%;
}
.part_4 .science .goal-tabs .goal-tab-middle {
  width: 50%;
}
/* 激活态胶囊：蓝色底白字并置于上层 */
.part_4 .science .goal-tabs .goal-tab.active {
  background-color: #2f7ec9;
  color: #ffffff;
  z-index: 2;
}
.part_4 .science .goal-card {
  display: flex;
  gap: 40px;
  align-items: center;
  margin-top: 40px;
  padding: 80px 51px;
  background: linear-gradient(180deg, #c4dcfe 0%, #e6f0fe 100%);
  border-radius: 10px;
  box-sizing: border-box;
}
.part_4 .science .goal-card .goal-text {
  flex: 1 1 auto;
  margin: 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.5;
  color: #000000;
  text-align: justify;
}
.part_4 .science .goal-card .goal-img {
  flex: 0 0 auto;
  display: block;
  width: 433px;
  max-width: 100%;
}

/* 实践主题：左文右图渐变卡片 */
.part_4 .science .science-practice {
  margin-top: 41px;
}
.part_4 .science .practice-card {
  display: flex;
  gap: 84px;
  align-items: center;
  padding: 70px 50px;
  background: linear-gradient(180deg, #c4dcfe 0%, #e6f0fe 100%);
  border-radius: 10px;
  box-sizing: border-box;
}
.part_4 .science .practice-card .practice-info {
  flex: 1 1 auto;
  min-width: 0;
}
.part_4 .science .practice-card .practice-info .section-title {
  text-align: left;
}
/* 实践主题分割线宽 644px（还原设计稿 2.svg） */
.part_4 .science .practice-card .practice-info .section-divider {
  max-width: 100%;
}
.part_4 .science .practice-card .practice-heading {
  display: flex;
  align-items: center;
  margin-top: 54px;
}
.part_4 .science .practice-card .practice-heading .practice-number {
  font-size: 96px;
  font-weight: 900;
  line-height: 1;
  color: #000000;
}
.part_4 .science .practice-card .practice-heading .practice-name {
  margin-left: 35px;
  font-size: 30px;
  line-height: 1.5;
  color: #000000;
}
.part_4 .science .practice-card .practice-detail {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  margin-top: 60px;
}
/* 上下切换箭头：白底圆形描边按钮（还原设计稿 3.svg / 4.svg 的 chevron 图标） */
.part_4 .science .practice-card .practice-arrows {
  display: flex;
  flex-direction: column;
  gap: 20px;
  flex-shrink: 0;
  padding-top: 10px;
}
.part_4 .science .practice-card .practice-arrows .arrow-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background-color: #ffffff;
  border: 1px solid #333333;
  border-radius: 50%;
  cursor: pointer;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}
.part_4 .science .practice-card .practice-arrows .arrow-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}
.part_4 .science .practice-card .practice-detail .practice-text {
  flex: 1 1 auto;
  margin: 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.5;
  color: #000000;
  text-align: justify;
}
/* 主题配图：锁定设计稿 416×582 比例并裁切填充，保证切换不同比例图片时卡片高度一致 */
.part_4 .science .practice-card .practice-img {
  flex: 0 0 auto;
  display: block;
  width: 416px;
  max-width: 100%;
  aspect-ratio: 416 / 582;
  object-fit: cover;
  border: 1px solid #dddddd;
  box-sizing: border-box;
}

/* 课时与年级安排：双面板渐变卡片 */
.part_4 .science .science-schedule {
  margin-top: 48px;
  padding-bottom: 60px;
}
.part_4 .science .schedule-card {
  display: flex;
  gap: 68px;
  margin-top: 26px;
  padding: 52px 40px;
  background: linear-gradient(180deg, #c4dcfe 0%, #e6f0fe 100%);
  border-radius: 20px;
  box-sizing: border-box;
}
.part_4 .science .schedule-card .schedule-panel {
  flex: 1 1 0;
  min-width: 0;
  padding: 40px;
  background-color: #f0f5ff;
  box-sizing: border-box;
}
/* 面板配图：年级标签白色文字叠加于图片正中（设计稿图片自带 50% 黑色压暗） */
.part_4 .science .schedule-card .schedule-panel .panel-image {
  position: relative;
}
.part_4 .science .schedule-card .schedule-panel .panel-image img {
  display: block;
  width: 100%;
  aspect-ratio: 441 / 179;
  object-fit: cover;
}
.part_4 .science .schedule-card .schedule-panel .panel-image .panel-grade {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  line-height: 1.5;
  color: #ffffff;
}
.part_4 .science .schedule-card .schedule-panel .panel-text {
  margin: 25px 0 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.5;
  color: #000000;
}
.part_4 .science .schedule-card .schedule-panel .panel-text-center {
  text-align: center;
}

/* ================= 响应式媒体查询 ================= */
/* 平板适配：1024px 及以下 */
@media (max-width: 1024px) {
  /* 屏幕收窄后按百分比Logo会偏小，适当放大占比保证可读性 */
  .header .banner .banner-logo {
    width: 18%;
    left: 16%;
  }
  /* 开学动态模块：头条图与文字上下堆叠，卡片两列 */
  .part_2 .dynamic .dynamic-card .dynamic-feature {
    flex-direction: column;
  }
  .part_2 .dynamic .dynamic-card .dynamic-feature .feature-image {
    width: 100%;
    max-width: none;
  }
  .part_2 .dynamic .dynamic-card .dynamic-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  /* 开学指南模块：缩小标题与海报，提示卡片改为单列保证可读性 */
  .part_3 .guides {
    padding: 60px 20px 100px;
  }
  .part_3 .guides .guides-title {
    width: 320px;
  }
  .part_3 .guides .guide-module .module-header h3 {
    font-size: 28px;
  }
  .part_3 .guides .guide-module .module-body {
    flex-direction: column;
  }
  .part_3 .guides .guide-module .module-poster {
    width: 100%;
    height: 320px;
  }
  .part_3 .guides .guide-module .module-poster .poster-text {
    bottom: 24px;
  }
  .part_3 .guides .guide-module .module-poster .poster-text strong {
    font-size: 24px;
  }
  .part_3 .guides .guide-module .module-tips {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 16px;
  }
  .part_3 .guides .guide-module .module-tips .tip-card-wide {
    grid-column: auto;
  }
  /* 科学教育模块：标题与头图缩小，选项卡改为并排不交叠，卡片内容上下堆叠 */
  .part_4 .science .science-hero {
    padding: 60px 20px 40px;
  }
  .part_4 .science .science-hero .hero-img {
    width: 420px;
  }
  .part_4 .science .science-hero .hero-title {
    font-size: 30px;
  }
  .part_4 .science .section-title {
    font-size: 32px;
  }
  .part_4 .science .goal-tabs {
    display: flex;
    gap: 12px;
    height: auto;
  }
  .part_4 .science .goal-tabs .goal-tab {
    position: static;
    flex: 1 1 0;
    width: auto;
    font-size: 24px;
  }
  .part_4 .science .goal-card {
    flex-direction: column;
    padding: 50px 30px;
  }
  .part_4 .science .goal-card .goal-img {
    margin: 0 auto;
  }
  .part_4 .science .practice-card {
    flex-direction: column;
    gap: 40px;
    padding: 40px 30px;
  }
  .part_4 .science .practice-card .practice-heading {
    margin-top: 40px;
  }
  .part_4 .science .practice-card .practice-img {
    margin: 0 auto;
  }
  .part_4 .science .schedule-card {
    flex-direction: column;
    gap: 24px;
    padding: 32px 24px;
  }
}

/* 手机适配：768px 及以下 */
@media (max-width: 768px) {
  .header .banner .banner-logo {
    width: 26%;
    left: 5%;
    top: 8%;
  }
  /* 图片直播模块：加高容器并放大标题与封面卡片占比，保证封面文字在手机上可读 */
  .part_1 .live .live-cover {
    width: 100%;
    padding: 20px;
  }
  .part_1 .live .live-cover .live-cover-btn {
    margin-top: 20px;
  }
  .part_1 .live .live-cover .live-cover-btn .live-cover-btn-item img{
    
  }
  .part_1 .live .live-title{
    margin-top: 40px;
  }
  .part_1 .live .live-title {
    width: 46%;
    left: 27%;
    top: 6%;
  }
  .part_1 .live .live-cover {
  }
  /* 开学动态模块：减小标题尺寸，卡片单列，文章内边距收紧 */
  .part_2 .dynamic {
    padding: 40px 16px 48px;
  }
  .part_2 .dynamic .dynamic-title {
    width: 70%;
    margin-bottom: 40px;
  }
  .part_2 .dynamic .dynamic-card {
    padding: 12px;
  }
  .part_2 .dynamic .dynamic-card .dynamic-feature {
    padding: 16px;
    gap: 16px;
  }
  .part_2 .dynamic .dynamic-card .dynamic-feature .feature-body .feature-title {
    font-size: 18px;
  }
  .part_2 .dynamic .dynamic-card .dynamic-feature .feature-body .feature-summary {
    font-size: 14px;
  }
  .part_2 .dynamic .dynamic-card .dynamic-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-bottom: 28px;
  }
  .part_2 .dynamic .dynamic-card .dynamic-more {
    width: 100%;
    text-align: center;
    padding: 12px 0;
  }
  .footer {
    flex-direction: column;
  }
  .footer .footer-placeholder {
    display: none;
  }
  .footer .footer-info .footer-filing {
    flex-direction: column;
    align-items: center;
    gap: 4px;
  }
  /* 开学指南模块：手机端进一步收紧，标题、卡片全宽单列 */
  .part_3 .guides {
    padding: 40px 16px 60px;
  }
  .part_3 .guides .guides-title {
    width: 80%;
    margin-bottom: 30px;
  }
  .part_3 .guides .guide-module {
    margin-bottom: 30px;
  }
  .part_3 .guides .guide-module .module-header {
    height: auto;
    gap: 12px;
  }
  .part_3 .guides .guide-module .module-header .module-icon,
  .part_3 .guides .guide-module .module-header .module-icon-red,
  .part_3 .guides .guide-module .module-header .module-icon-teal {
    width: 40px;
    height: 40px;
  }
  .part_3 .guides .guide-module .module-header .module-icon svg {
    width: 24px;
    height: 24px;
  }
  .part_3 .guides .guide-module .module-header h3 {
    font-size: 22px;
  }
  .part_3 .guides .guide-module .module-poster {
    height: 260px;
  }
  .part_3 .guides .guide-module .module-poster .poster-text {
    width: 90%;
    max-width: 240px;
    bottom: 20px;
    border-radius: 16px;
  }
  .part_3 .guides .guide-module .module-poster .poster-text strong {
    font-size: 20px;
  }
  .part_3 .guides .guide-module .module-poster .poster-text span {
    font-size: 13px;
  }
  .part_3 .guides .guide-module .module-tips {
    gap: 16px;
    padding: 12px;
  }
  .part_3 .guides .guide-module .module-tips .tip-card {
    gap: 12px;
    padding: 12px;
  }
  .part_3 .guides .guide-module .module-tips .tip-card .tip-header h4 {
    font-size: 16px;
  }
  .part_3 .guides .guide-module .module-tips .tip-card .tip-summary {
    font-size: 14px;
  }
  .part_3 .guides .guide-module .module-tips .tip-card .tip-summary-more {
    font-size: 14px;
  }
  .part_3 .guides .guide-module .module-tips .tip-card .tip-more {
    font-size: 14px;
  }
  /* 科学教育模块：手机端全面收紧字号与间距，箭头改为横向排列 */
  .part_4 .science .science-section {
    padding: 0 16px;
  }
  .part_4 .science .science-hero {
    padding: 40px 16px 32px;
  }
  .part_4 .science .science-hero .hero-img {
    width: 80%;
  }
  .part_4 .science .science-hero .hero-intro {
    margin-top: 20px;
    font-size: 16px;
  }
  .part_4 .science .science-hero .hero-title {
    margin-top: 20px;
    font-size: 22px;
  }
  .part_4 .science .section-title {
    font-size: 26px;
  }
  .part_4 .science .section-divider {
    margin-top: 16px;
  }
  .part_4 .science .goal-tabs {
    margin-top: 28px;
  }
  .part_4 .science .goal-tabs .goal-tab {
    height: 48px;
    font-size: 20px;
    line-height: 48px;
  }
  .part_4 .science .goal-card {
    margin-top: 28px;
    padding: 30px 20px;
  }
  .part_4 .science .goal-card .goal-text {
    font-size: 16px;
  }
  .part_4 .science .science-practice {
    margin-top: 32px;
  }
  .part_4 .science .practice-card {
    gap: 28px;
    padding: 28px 20px;
  }
  .part_4 .science .practice-card .practice-heading .practice-number {
    font-size: 56px;
  }
  .part_4 .science .practice-card .practice-heading .practice-name {
    margin-left: 20px;
    font-size: 22px;
  }
  .part_4 .science .practice-card .practice-detail {
    gap: 20px;
    margin-top: 32px;
  }
  .part_4 .science .practice-card .practice-arrows {
    flex-direction: row;
    padding-top: 0;
  }
  .part_4 .science .practice-card .practice-detail .practice-text {
    font-size: 16px;
  }
  .part_4 .science .science-schedule {
    margin-top: 36px;
    padding-bottom: 40px;
  }
  .part_4 .science .schedule-card {
    gap: 16px;
    margin-top: 20px;
    padding: 20px 16px;
  }
  .part_4 .science .schedule-card .schedule-panel {
    padding: 20px;
  }
  .part_4 .science .schedule-card .schedule-panel .panel-image .panel-grade {
    font-size: 22px;
  }
  .part_4 .science .schedule-card .schedule-panel .panel-text {
    margin-top: 18px;
    font-size: 16px;
  }
}