@media (max-width: 1779px) {
  .hero-logo { margin-left: -20px; }
  .hero-bar-right { margin-right: -20px; }
}
/* 平板适配：三列改单列、水印隐藏、导航收紧 */
@media (max-width: 1080px) {
  .row.three-col { grid-template-columns: 1fr; }
  .footer-inner { flex-wrap: wrap; justify-content: center; padding: 0 20px; }
  .nav-list a { font-size: 14px; letter-spacing: 1px; }
  .watermark { display: none; }
  .hero-search-input { width: 130px; }
  /* 取消桌面端的负边距，避免窄屏横向溢出 */
  .hero-logo { margin-left: 0; }
  .hero-bar-right { gap: 10px; margin-right: 0; }
  .hero-carousel { height: 300px; }
  .dropdown {
    min-width: 120px;
  }
}
/* 手机适配：压缩顶部、导航横滑、页脚纵向排列 */
@media (max-width: 720px) {
  /* 顶栏：Logo + 学校主页 + 汉堡合并到一行固定白条 */
  .hero-bar { height: 0; background: none; backdrop-filter: none; }
  .hero-bar-inner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: auto;
    margin: 0;
    height: 48px;
    padding: 0 56px 0 15px; /* 右侧预留汉堡按钮位置 */
    background: #009ad9;
    align-items: center;
    justify-content: space-between;
    z-index: 1150;
    box-shadow: 0 2px 8px rgba(0,0,0,.12);
  }
  .hero-logo { width: auto; }
  .hero-logo img {height: 35px;}
  /* 学校主页图标与文字：白底上用主色调 */
  .hero-school {color: #fff;font-size: 15px;padding-right: 0;}
  .hero-bar-right svg path {fill: ##fff;}
  .hero-carousel {height: 144px;}
  .hero-search { display: none; }
  .hero-bar-right { gap: 8px; }
  .row.three-col { grid-template-columns: 1fr; }
  /* ===== 移动端导航：固定顶栏 + 汉堡按钮 + 右侧滑入深色面板 ===== */
  body { padding-top: 48px; }
  /* 汉堡按钮所在容器：透明，只占右上角一小块，与白条内元素同行 */
  .nav {
    position: fixed;
    top: 0; right: 0;
    width: auto;
    margin: 0; padding: 0 6px 0 0;
    height: 48px;
    background: none;
    display: flex;
    align-items: center;
    z-index: 1200;
    box-shadow: none;
  }
  .nav-toggle { display: flex; }
  /* 菜单面板：主色调，用 translateX 滑入（宽度全程恒定，不会中途变窄） */
  .nav-list {
    position: fixed;
    top: 48px; left: 0; right: 0; bottom: 0;
    z-index: 1100;
    display: block;
    background: var(--lake-primary);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 8px 0 30px;
    transform: translateX(100%);
    transition: transform .3s ease;
  }
  .nav.open .nav-list { transform: translateX(0); }
  .nav-list li {
    display: block;
    flex: none;
    border-bottom: 1px solid rgba(255,255,255,.18);
  }
  .nav-list > li > a {
    height: 48px; line-height: 48px;
    text-align: left;
    padding: 0 20px;
    color: #fff;
    font-size: 15px;
    font-weight: bold;
  }
  /* 激活项：主色底上用深色叠加区分 */
  .nav-list li.active a { background: rgba(0,0,0,.18); }
  /* 一级项右侧的展开指示符 +/? */
  .has-dropdown > a { position: relative; }
  .has-dropdown > a::after {
    content: "+";
    position: absolute;
    right: 20px; top: 0;
    line-height: 48px;
    font-size: 18px;
    color: rgba(255,255,255,.7);
  }
  .has-dropdown.open > a::after { content: "-"; }
  /* 子菜单：手风琴展开（点击一级项切换，见 main.js） */
  .has-dropdown .dropdown {
    position: static;
    display: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    min-width: 100%;
    width: auto;
    background: rgba(255,255,255,.06);
    box-shadow: none;
    border-radius: 0;
    padding: 0;
  }
  .has-dropdown .dropdown::before { display: none; }
  /* 展开与 hover 时都锁定位移：防止桌面端 translateX(-50%) 规则让子菜单左右跳动 */
  .has-dropdown.open .dropdown
 {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .dropdown li {border-bottom: none;}
  .dropdown li a {
    text-align: left;
    color: rgb(255 255 255);
    padding-left: 36px;
  }
  .footer-inner { flex-direction: column; gap: 14px; text-align: center; }
  .qr-item { margin: 0 auto; }
  /* 双重保险：取消负边距，防止横向滚动 */
  .hero-logo { margin-left: 0; }
  .hero-bar-right { margin-right: 0; }
  /* 图片卡轮播与标题的移动端尺寸 */
  .feature-carousel { height: 200px; }
  .feature-carousel .feature-img img { height: 200px; }
  .feature-caption { font-size: 12px; padding: 14px 10px 8px; }
  .feature-carousel .feature-dots .dot { width: 7px; height: 7px; }
  /* 二维码间距归零，避免小屏挤压 */
  .qr-item-left, .qr-item-right { margin-left: 0; }
}
/* 小屏手机适配：进一步压缩 Banner 与图片卡 */
@media (max-width: 480px) {
  .hero-logo img {height: 0.5rem;}
  .hero-title { font-size: 14px; letter-spacing: 1px; }
  .hero-carousel { height: 170px; }
  .feature-carousel { height: 170px; }
  .feature-carousel .feature-img img { height: 170px; }
  .feature-caption { font-size: 11px; }
  .card-body { padding: 10px 12px; }
  .footer-inner { padding: 0 10px; }
}