/* 页面样式：桌面布局、移动端适配、减少动态效果设置 */

* {
  box-sizing:border-box;
}

html {
  scroll-behavior:smooth;
  scroll-padding-top:74px;
}

body {
  margin:0;
  background:#fff;
  color:#16171a;
  font-family:"Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",sans-serif;
  line-height:1.8;
}

a {
  color:inherit;
  text-decoration:none;
}

img {
  max-width:100%;
  display:block;
}

header {
  height:94px;
  padding:20px 5%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  border-bottom:1px solid #ddd;
}

header img {
  width:164px;
}

header nav {
  display:flex;
  gap:28px;
  font-size:14px;
}

.wrap {
  max-width:1280px;
  margin:auto;
  padding:0 4%;
}

.crumb {
  color:#777;
  font-size:13px;
  padding-top:25px;
}

.hero {
  display:grid;
  grid-template-columns:1.15fr 1fr;
  gap:55px;
  align-items:center;
  padding:55px 0 65px;
}

.tag {
  font:12px monospace;
  color:#8b8d8f;
  letter-spacing:1.5px;
}

.tag:before {
  content:"";
  display:inline-block;
  background:#d02928;
  width:24px;
  height:2px;
  vertical-align:middle;
  margin-right:12px;
}

h1 {
  font-size:clamp(34px,4vw,56px);
  line-height:1.2;
  letter-spacing:-2px;
  margin:24px 0;
  font-weight:900;
}

h1 span {
  color:#626466;
}

h2 {
  font-size:36px;
  line-height:1.35;
  margin:16px 0 22px;
  letter-spacing:-1px;
}

h3 {
  font-size:21px;
  line-height:1.5;
  margin:10px 0;
}

h4 {
  font-size:18px;
  margin:7px 0;
}

p {
  color:#555;
  margin:12px 0;
  font-size:16px;
}

.hero figure {
  margin:0;
  position:relative;
}

.hero figure img {
  width:100%;
  aspect-ratio:1.4;
  object-fit:cover;
}

.hero figcaption {
  font-size:12px;
  color:#888;
  margin-top:10px;
}

.btn {
  display:inline-block;
  background:#d02928;
  color:#fff;
  padding:12px 24px;
  font-size:14px;
  margin-top:20px;
}

.subnav {
  position:sticky;
  top:0;
  background:#fff;
  z-index:4;
  border-top:1px solid #ddd;
  border-bottom:1px solid #ddd;
  display:flex;
  justify-content:center;
  gap:40px;
  overflow:auto;
}

.subnav a {
  padding:18px 0;
  white-space:nowrap;
  font-size:14px;
}

section {
  padding:76px 0;
}

.head {
  display:grid;
  grid-template-columns:1.1fr 1fr;
  gap:60px;
  align-items:end;
  margin-bottom:32px;
}

.head p {
  margin-bottom:22px;
}

.gray {
  background:#f7f7f5;
}

.four {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
}

.principle {
  border-top:1px solid #aaa;
  padding-top:20px;
}

.principle p {
  font-size:14px;
}

.num {
  font:13px monospace;
  color:#8b8d8f;
}

.route {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  margin-top:40px;
  border:1px solid #ddd;
}

.route article {
  padding:25px 32px;
  border-right:1px solid #ddd;
}

.route article:last-child {
  border:0;
}

.route p {
  font-size:14px;
}

.twocol {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:45px;
}

.service {
  border-top:1px solid #bbb;
  padding:20px 0;
  display:grid;
  grid-template-columns:48px 1fr;
  gap:12px;
}

.service p {
  font-size:15px;
}

.service strong {
  font-weight:500;
  color:#333;
}

.resource {
  display:grid;
  grid-template-columns:170px 1fr;
  gap:30px;
  padding:30px 0;
  border-top:1px solid #ccc;
}

.chips {
  display:flex;
  flex-wrap:wrap;
  gap:9px;
  margin-top:15px;
}

.chips span {
  padding:6px 12px;
  border:1px solid #ddd;
  font-size:13px;
  background:white;
}

.software {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:22px;
}

.software img {
  width:100%;
  aspect-ratio:1.6;
  object-fit:cover;
}

.software p {
  font-size:14px;
}

.hardware {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
}

.hardware img {
  width:100%;
  aspect-ratio:2;
  object-fit:contain;
  background:#fff;
}

.hardware p {
  font-size:14px;
}

.labs {
  display:grid;
  grid-template-columns:280px 1fr;
  border:1px solid #ddd;
}

.labmenu {
  background:#f7f7f5;
}

.labmenu button {
  display:block;
  border:0;
  border-bottom:1px solid #ddd;
  background:transparent;
  padding:17px 20px;
  text-align:left;
  width:100%;
  font:15px inherit;
  color:#555;
  cursor:pointer;
}

.labmenu button[aria-selected=true] {
  background:#16171a;
  color:white;
}

.labcontent {
  padding:36px;
}

.labcontent h3 {
  font-size:27px;
}

.labcontent ul {
  padding-left:20px;
  color:#555;
  columns:2;
  column-gap:30px;
}

.labcontent li {
  break-inside:avoid;
  margin-bottom:14px;
}

.labcontent .foot {
  padding:18px;
  background:#f7f7f5;
  font-size:14px;
  margin-top:28px;
}

.expand {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
  margin-top:28px;
}

.expand article {
  padding:25px;
  background:#f7f7f5;
}

.expand p {
  font-size:14px;
}

.gallery {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:26px 20px;
}

.gallery img {
  width:100%;
  aspect-ratio:1.48;
  object-fit:cover;
}

.gallery p {
  font-size:14px;
  margin:10px 0;
}

.note {
  font-size:12px;
  color:#888;
}

.cta {
  background:#16171a;
  color:white;
}

.cta p {
  color:#ccc;
  max-width:760px;
}

.cta h2 {
  font-size:38px;
}

footer {
  padding:30px 5%;
  color:#777;
  font-size:12px;
}

.step {
  border-top:1px solid #aaa;
  padding-top:18px;
}

.step p {
  font-size:14px;
}

a:focus-visible,button:focus-visible {
  outline:2px solid #d02928;
  outline-offset:4px;
}

@media(max-width:800px) {
  header nav {
    display:none;
  }
  .hero,.head,.twocol {
    grid-template-columns:1fr;
    gap:20px;
  }
  .hero {
    padding-top:30px;
  }
  .hero figure img {
    aspect-ratio:1.8;
  }
  h2 {
    font-size:28px;
  }
  .four,.gallery {
    grid-template-columns:repeat(2,1fr);
  }
  .subnav {
    justify-content:flex-start;
    padding:0 5%;
    gap:25px;
  }
  .resource {
    grid-template-columns:1fr;
    gap:8px;
  }
  .labs {
    grid-template-columns:1fr;
  }
  .labmenu {
    display:flex;
    overflow:auto;
  }
  .labmenu button {
    min-width:150px;
    border-right:1px solid #ddd;
  }
  .labcontent {
    padding:24px;
  }
  .software {
    grid-template-columns:repeat(2,1fr);
  }
  section {
    padding:48px 0;
  }
  .route article {
    padding:20px;
  }
  .route {
    grid-template-columns:1fr;
  }
  .route article {
    border-right:0;
    border-bottom:1px solid #ddd;
  }
  .labcontent ul {
    columns:1;
  }
  .cta h2 {
    font-size:28px;
  }
}

@media(max-width:480px) {
  .hardware,.expand {
    grid-template-columns:1fr;
  }
  .gallery {
    gap:20px 12px;
  }
  .four {
    gap:20px 16px;
  }
}
/* 教学实训、实操工厂、实践应用的配图 */
.route-img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: center;
  margin-bottom: 24px;
}

/* 保留第三张图下方的无人车主体 */
.route article:nth-child(3) .route-img {
  object-position: center bottom;
}
/* 专业建设：四个模块的上方配图 */
#major .service {
  align-content: start;
  align-items: start;
}

/* 图片横跨编号列和文字列 */
#major .service-media {
  grid-column: 1 / -1;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-bottom: 16px;
  overflow: hidden;
  background: #fff;
}

#major .service-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* 方案封面、教材图片完整展示，避免文字被裁切 */
#major .service-img--contain {
  object-fit: contain;
}

/* 手机端图片与文字的间距 */
@media (max-width: 800px) {
  #major .service-media {
    margin-bottom: 10px;
  }
}
/* 实训空间：左侧名称，右侧图文介绍 */
#framework .labs {
  grid-template-columns: 280px minmax(0, 1fr);
}

#framework .labcontent {
  min-width: 0;
  padding: 32px;
}

#framework .lab-detail {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 28px;
  align-items: start;
}

#framework .lab-detail-text {
  min-width: 0;
}

#framework .lab-detail-text h3 {
  font-size: 25px;
  line-height: 1.5;
  margin: 14px 0;
}

#framework .lab-intro {
  font-size: 15px;
  margin-bottom: 24px;
}

#framework .lab-detail-text h4 {
  font-size: 16px;
  margin-bottom: 12px;
}

#framework .lab-detail-text ul {
  columns: 1;
  padding-left: 20px;
  margin: 0;
  font-size: 14px;
}

#framework .lab-detail-text li {
  margin-bottom: 10px;
}

#framework .lab-detail-image {
  min-width: 0;
  margin: 0;
}

#framework .lab-detail-image img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

#framework .lab-detail-image figcaption {
  margin-top: 10px;
  color: #8b8d8f;
  font-size: 12px;
}

/* 平板：介绍和图片上下排列 */
@media (max-width: 1100px) {
  #framework .lab-detail {
    grid-template-columns: 1fr;
  }
}

/* 手机：名称横向滑动，下面显示图文 */
@media (max-width: 800px) {
  #framework .labs {
    grid-template-columns: 1fr;
  }

  #framework .labcontent {
    padding: 24px;
  }

  #framework .labmenu button {
    flex: 0 0 180px;
    white-space: normal;
  }
}

@media(prefers-reduced-motion:reduce) {
  html {
    scroll-behavior:auto;
  }
}