/* ===== ① 吸顶导航条 ===== */
.top {
  position: -webkit-sticky;
  position: sticky;   /* 关键：页面滚动时始终吸附在顶部 */
  top: 0;
  z-index: 1000;
}

.main-nav {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .2);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}


.logo-text {
  display: inline-block;
  padding: 18px 0;
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 1px;
}
.logo img { display: block; max-width: 100%; height: auto; padding-bottom:10px;}

/* ===== 导航主体 ===== */
.nav ul { list-style: none; margin: 0; padding: 0; }
.nav a { text-decoration: none; }
.nav > ul { display: flex; flex-wrap: nowrap; }  /* 菜单项不换行、不挤压 */

.nav > ul > li { position: relative; flex-shrink: 0; }
.nav > ul > li > a {
  display: block;
  padding: 20px 18px;
  color: #000;
  font-size: 16px;
  font-weight:bold;
  white-space: nowrap;  /* 文字始终横向显示，不竖排 */
  transition: background .2s;
}
.nav > ul > li > a:hover,
.nav > ul > li > a:focus { background: rgba(255, 255, 255, .12); }
/* 下拉箭头用 CSS 三角绘制，不依赖任何特殊字符（GB2312 编码下也不会乱码） */
.nav > ul > li.has-sub > a::after {
  content: "";
  display: inline-block;
  margin-left: 6px;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid #000;
  vertical-align: middle;
}

/* ===== ② 二级下拉菜单 ===== */
.nav .sub {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  padding: 6px 0;
  background: #fff;
  border-radius: 4px;
  font-size:16px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, .18);
  z-index: 1001;
}
.nav > ul > li:hover > .sub,
.nav > ul > li:focus-within > .sub { display: block; }

.nav .sub > li { position: relative; }
.nav .sub > li > a {
  display: block;
  padding: 10px 18px;
  color: #333;
  white-space: nowrap;
}
.nav .sub > li > a:hover { background: #ffb027; color: #fff; }
/* 三级菜单指示箭头（指向右侧） */
.nav .sub > li.has-sub > a::after {
  content: "";
  display: inline-block;
  margin-left: 8px;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 5px solid #333;
  vertical-align: middle;
}

/* ===== ② 三级下拉菜单（显示在二级菜单的右侧） ===== */
.nav .sub2 {
  display: none;
  position: absolute;
  top: 0;
  left: 100%;          /* 关键：紧贴二级菜单右侧展开 */
  min-width: 160px;
  padding: 6px 0;
  background: #fff;
  border-radius: 4px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, .18);
  z-index: 1002;
}
.nav .sub li:hover > .sub2,
.nav .sub li:focus-within > .sub2 { display: block; }
.nav .sub2 > li > a {
  display: block;
  padding: 9px 16px;
  color: #333;
  white-space: nowrap;
}
.nav .sub2 > li > a:hover { background: #ffb027; color: #fff; }

/* 最右侧一级菜单下的三级菜单改为向左展开，避免超出屏幕右缘 */
.nav > ul > li:last-child .sub li:hover > .sub2,
.nav > ul > li:last-child .sub li:focus-within > .sub2 { left: auto; right: 100%; }

/* ===== ③ 汉堡按钮（窄屏显示） ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  color:#000;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #000;
  transition: transform .3s, opacity .3s;
}
.nav.open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav.open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 中屏（993~1200px）：收紧间距，防止菜单挤在一起 */
@media (min-width: 993px) and (max-width: 1200px) {
  .container { padding: 0 12px; }
  .nav > ul > li > a { padding: 20px 10px; font-size: 15px; }
}

/* ===== ③ 自适应：窄屏（≤992px）切换为汉堡 + 纵向菜单 ===== */
@media (max-width: 992px) {
  .logo { max-width: 70%; }

  /* 兜底覆盖：原站样式若对 #nav/.nav 设了固定宽度或竖排(writing-mode)，
     会把菜单项挤成细长竖条、文字竖排；这里强制归位为横向整行 */
  .nav > ul,
  .nav .sub,
  .nav .sub2 {
    width: 100% !important;
    float: none !important;
  }
  .nav > ul > li,
  .nav .sub > li,
  .nav .sub2 > li {
    width: 100% !important;
    float: none !important;
    display: block !important;
  }
  .nav > ul > li > a,
  .nav .sub > li > a,
  .nav .sub2 > li > a {
    width: auto !important;
    min-width: 0 !important;
    white-space: nowrap !important;
    writing-mode: horizontal-tb !important;
    text-align: left !important;
  }

  /* 菜单改为全屏覆盖层：打开时盖住整屏（含左侧公司名），
     关闭按钮(×)保持在最上层，始终可点击 */
  .nav { position: relative; }
  .nav-toggle {
    display: flex !important;
    position: relative;
    z-index: 10;
  }
  .nav > ul {
    display: none !important;  /* !important：防止被原站 #nav 样式覆盖导致菜单异常 */
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    flex-direction: column;
    background: #ffb027;
    padding: 76px 0 24px;   /* 顶部留出关闭按钮的位置 */
    overflow-y: auto;
    z-index: 5;
  }
  .nav.open > ul { display: flex !important; }

  .nav > ul > li > a { padding: 14px 16px; border-bottom: 1px solid rgba(255, 255, 255, .08); }
  .nav > ul > li.has-sub > a::after { float: right; transition: transform .3s; }
  .nav > ul > li.open > a::after { transform: rotate(180deg); }

  /* 子菜单在窄屏改为纵向展开（点击父级展开），不再悬浮 */
  .nav .sub,
  .nav .sub2 {
    display: none !important;
    position: static;
    min-width: 0;
    padding: 0;
    background: rgba(0, 0, 0, .18);
    box-shadow: none;
    border-radius: 0;
  }
  .nav li.open > .sub { display: block !important; }
  .nav li.open > .sub2 { display: block !important; }
  .nav .sub > li > a { padding: 12px 16px 12px 36px; color: #d9e4f2; }
  .nav .sub2 > li > a { padding: 12px 16px 12px 56px; color: #b8cbdf; }
  .nav .sub > li > a:hover,
  .nav .sub2 > li > a:hover { color: #fff; background: rgba(255, 255, 255, .06); }
  .nav .sub > li.has-sub > a::after { float: right; transition: transform .3s; border-left-color: #d9e4f2; }
  .nav .sub > li.open > a::after { transform: rotate(90deg); }
}


.form-row {display: flex;align-items: center; gap: 0px; padding-top:10px;}
.form-row input,
.form-row button {
  height: 40px;          /* 高度必须一致 */
  box-sizing: border-box;
  margin: 0;
  border: 1px solid #ccc;
  font: 14px/1.4 "Microsoft YaHei", sans-serif;
  
}

.form-row input {
  flex: 1;               /* 输入框占满剩余宽度 */
  padding: 0 10px;
  color:#666;
}

.form-row button {
  padding: 0 16px 0 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  width:48px;
  background:url(../images/search.jpg) #ffb027; background-repeat:no-repeat; border:0;
}