/* ============================================================
   徐州宏昌工程机械培训学校 · 首页设计稿 v2
   主色：宏昌红  辅色：警示黄 / 工程蓝
   响应式：PC ≥1025 / 平板 769-1024 / 手机 ≤768 / 小屏 ≤480
   ============================================================ */
:root{
  --red:#D7261E;
  --red-dark:#B01812;
  --red-deep:#8A110D;
  --yellow:#FFC629;
  --yellow-dark:#F0A800;
  --blue:#1B4FA0;
  --ink:#22262C;
  --ink-2:#4A515A;
  --gray:#7A828E;
  --line:#E8EAEE;
  --bg:#F5F6F8;
  --white:#fff;
  --shadow:0 10px 30px rgba(34,38,44,.10);
  --shadow-sm:0 4px 14px rgba(34,38,44,.08);
  --radius:10px;
  --w:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;
  color:var(--ink);background:var(--white);line-height:1.7;font-size:15px;
  overflow-x:hidden;
}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
ul{list-style:none}
.wrap{width:var(--w);max-width:calc(100% - 32px);margin:0 auto}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 30px;border-radius:6px;font-size:16px;font-weight:700;
  cursor:pointer;border:2px solid transparent;transition:.2s;white-space:nowrap}
.btn-red{background:var(--red);color:#fff}
.btn-red:hover{background:var(--red-dark);transform:translateY(-2px);box-shadow:0 8px 20px rgba(215,38,30,.35)}
.btn-yellow{background:var(--yellow);color:var(--ink)}
.btn-yellow:hover{background:var(--yellow-dark);transform:translateY(-2px)}
.btn-outline{border-color:rgba(255,255,255,.85);color:#fff;background:transparent}
.btn-outline:hover{background:#fff;color:var(--red)}
.btn-block{width:100%;border:none;padding:14px}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--red-deep);color:rgba(255,255,255,.92);font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;gap:16px;height:38px}
.topbar .tb-right{display:flex;gap:22px;align-items:center;white-space:nowrap}
.topbar b{color:var(--yellow);font-weight:700}
.topbar .dot{width:5px;height:5px;border-radius:50%;background:var(--yellow);display:inline-block;margin-right:7px;vertical-align:2px}

/* ---------- 头部导航 ---------- */
.header{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.header .wrap{display:flex;align-items:center;height:80px;gap:18px}
.logo{display:flex;align-items:center;gap:11px;flex-shrink:0}
.logo-mark{width:50px;height:50px;border-radius:50%;overflow:hidden;
  border:2px solid #eee;box-shadow:var(--shadow-sm);flex-shrink:0}
.logo-mark svg{display:block;width:100%;height:100%}
.logo-name{font-size:18px;font-weight:800;color:var(--ink);line-height:1.25;
  letter-spacing:.3px;white-space:nowrap}
.logo-name small{display:block;font-size:10px;color:var(--gray);font-weight:400;
  letter-spacing:1.6px;margin-top:2px}
.nav{display:flex;gap:2px;margin-left:auto;align-items:center}
.nav>li{position:relative}
.nav>li>a{display:block;padding:29px 9px 27px;font-size:15px;font-weight:700;color:var(--ink);
  position:relative;white-space:nowrap}
.nav>li>a::after{content:"";position:absolute;left:9px;right:9px;bottom:20px;height:3px;
  background:var(--red);border-radius:2px;transform:scaleX(0);transition:.2s}
.nav>li:hover>a,.nav>li>a.active{color:var(--red)}
.nav>li:hover>a::after,.nav>li>a.active::after{transform:scaleX(1)}
.nav .caret{font-size:9px;margin-left:3px;color:var(--gray)}
.submenu{position:absolute;top:100%;left:0;min-width:180px;background:#fff;border-radius:0 0 8px 8px;
  box-shadow:var(--shadow);padding:8px 0;opacity:0;visibility:hidden;transform:translateY(8px);transition:.18s;z-index:50}
.nav>li:hover .submenu{opacity:1;visibility:visible;transform:translateY(0)}
.submenu a{display:block;padding:10px 18px;font-size:14px;color:var(--ink-2);font-weight:400;white-space:nowrap}
.submenu a:hover{background:#FDF1F0;color:var(--red);padding-left:22px}
.header .btn{margin-left:4px;padding:10px 20px;font-size:14px;flex-shrink:0}
/* 手机端子菜单展开按钮 / 关闭按钮：PC端隐藏 */
.sub-toggle{display:none}
.nav-close{display:none}

/* 汉堡按钮（PC隐藏） */
.nav-toggle{display:none;margin-left:auto;width:44px;height:44px;border:none;background:#fff;
  border-radius:8px;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.nav-toggle span{display:block;width:22px;height:2.5px;background:var(--ink);border-radius:2px;transition:.25s}
.nav-toggle.open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
/* 层级必须低于 .header(100)，否则会盖住 header 内的抽屉菜单；同时高于悬浮栏(90)以盖住页面 */
.nav-mask{display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:95}
.nav-mask.show{display:block}

/* ---------- HERO ---------- */
.hero{position:relative;color:#fff;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;
  background-image:url("../img/og-default.jpg");
  transform:scale(1.03)}
.hero-mask{position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(138,17,13,.93) 0%,rgba(176,24,18,.82) 42%,rgba(34,38,44,.45) 100%)}
.hero .wrap{position:relative;display:flex;align-items:center;gap:46px;padding:72px 16px 80px}
.hero-left{flex:1;min-width:0}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:22px}
.hero-tags span{font-size:13px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.35);
  padding:5px 13px;border-radius:30px;backdrop-filter:blur(4px)}
.hero h1{font-size:44px;line-height:1.28;font-weight:900;letter-spacing:1px;text-shadow:0 4px 18px rgba(0,0,0,.25)}
.hero h1 em{font-style:normal;color:var(--yellow)}
.hero p.sub{margin:20px 0 30px;font-size:17px;color:rgba(255,255,255,.92);max-width:560px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-btns .btn{padding:15px 38px;font-size:17px}
.hero-points{display:flex;gap:28px;margin-top:34px;font-size:14px;color:rgba(255,255,255,.9);flex-wrap:wrap}
.hero-points b{color:var(--yellow);font-size:20px;margin-right:5px}
/* 报名卡 */
.sign-card{width:360px;flex-shrink:0;background:#fff;border-radius:12px;padding:28px 26px;color:var(--ink);
  box-shadow:0 24px 60px rgba(0,0,0,.35)}
.sign-card h3{font-size:21px;font-weight:800;text-align:center}
.sign-card h3 i{color:var(--red);font-style:normal}
.sign-card .tip{text-align:center;font-size:12.5px;color:var(--gray);margin:7px 0 18px}
.sign-card input,.sign-card select{width:100%;height:46px;border:1.5px solid var(--line);border-radius:6px;
  padding:0 13px;font-size:14.5px;margin-bottom:12px;font-family:inherit;color:var(--ink);background:#fff}
.sign-card input:focus,.sign-card select:focus{outline:none;border-color:var(--red)}
.sign-card .privacy{font-size:12px;color:var(--gray);text-align:center;margin-top:10px}

/* ---------- 快捷入口 ---------- */
.quick{margin-top:-46px;position:relative;z-index:20}
.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.quick-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);
  transition:.22s;display:block}
.quick-card:hover{transform:translateY(-6px)}
.qc-img{height:168px;overflow:hidden;position:relative}
.qc-img img{width:100%;height:100%;object-fit:cover;transition:.4s}
.quick-card:hover .qc-img img{transform:scale(1.07)}
.qc-tag{position:absolute;left:14px;top:14px;background:var(--red);color:#fff;font-size:12.5px;
  padding:4px 12px;border-radius:4px;font-weight:700}
.qc-body{padding:18px 20px 20px}
.qc-body h3{font-size:20px;font-weight:800;margin-bottom:6px}
.qc-body p{font-size:13.5px;color:var(--gray);margin-bottom:12px}
.qc-meta{display:flex;justify-content:space-between;align-items:center;border-top:1px dashed var(--line);padding-top:13px;gap:10px}
.qc-price{color:var(--red);font-weight:800;font-size:14px;white-space:nowrap}
.qc-price b{font-size:21px}
.qc-go{color:var(--red);font-weight:700;font-size:14px;white-space:nowrap}
.quick-card:hover .qc-go{letter-spacing:2px}

/* ---------- 通用板块 ---------- */
.section{padding:64px 0}
.section.gray{background:var(--bg)}
.sec-head{text-align:center;margin-bottom:40px}
.sec-head .kicker{display:inline-block;color:var(--red);font-size:13px;font-weight:700;letter-spacing:3px;
  border:1px solid rgba(215,38,30,.35);padding:4px 16px;border-radius:30px;margin-bottom:14px;background:#fff}
.sec-head h2{font-size:32px;font-weight:900;letter-spacing:1px}
.sec-head h2 em{font-style:normal;color:var(--red)}
.sec-head .desc{color:var(--gray);margin-top:10px;font-size:15px}

/* ---------- 数据带 ---------- */
.stats{background:linear-gradient(120deg,var(--red-deep),var(--red) 60%,var(--red-dark));
  padding:42px 0;color:#fff}
.stat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;text-align:center}
.stat-item b{display:block;font-size:40px;font-weight:900;color:var(--yellow);line-height:1.15;
  font-family:Arial,"Microsoft YaHei",sans-serif}
.stat-item span{font-size:14.5px;color:rgba(255,255,255,.92)}

/* ---------- 学校简介 ---------- */
.about-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:46px;align-items:center}
.about-img{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.about-img img{width:100%;height:420px;object-fit:cover}
.about-img .badge{position:absolute;left:20px;bottom:20px;background:rgba(138,17,13,.92);color:#fff;
  padding:12px 20px;border-radius:8px;font-weight:700;font-size:15px}
.about-img .badge small{display:block;font-weight:400;font-size:12px;color:rgba(255,255,255,.85);margin-top:2px}
.about-text h2{font-size:30px;font-weight:900;line-height:1.35;margin-bottom:18px}
.about-text h2 em{font-style:normal;color:var(--red)}
.about-text p{color:var(--ink-2);margin-bottom:14px;font-size:15px}
.honor-tags{display:flex;flex-wrap:wrap;gap:9px;margin:20px 0 26px}
.honor-tags li{font-size:13.5px;background:#fff;border:1.5px solid #F3C3C0;color:var(--red-dark);
  padding:6px 13px;border-radius:5px;font-weight:600}

/* ---------- 课程 ---------- */
.course-sub{display:flex;align-items:center;gap:14px;margin:8px 0 22px}
.course-sub .bar{width:6px;height:26px;background:var(--red);border-radius:3px;flex-shrink:0}
.course-sub h3{font-size:22px;font-weight:800;white-space:nowrap}
.course-sub .line{flex:1;height:1px;background:var(--line)}
.course-sub .more{font-size:14px;color:var(--red);font-weight:700;white-space:nowrap}
.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.course-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 22px;
  transition:.2s;display:flex;flex-direction:column;position:relative;overflow:hidden}
.course-card:hover{box-shadow:var(--shadow);border-color:transparent;transform:translateY(-4px)}
.course-card .cc-hot{position:absolute;top:0;right:0;background:var(--red);color:#fff;font-size:12px;
  padding:4px 14px 5px;border-radius:0 0 0 10px;font-weight:700}
.course-card .cc-name{font-size:19px;font-weight:800;margin-bottom:4px}
.course-card .cc-duration{font-size:13px;color:var(--gray);margin-bottom:14px}
.course-card ul{margin-bottom:18px;flex:1}
.course-card li{font-size:13.5px;color:var(--ink-2);padding-left:18px;position:relative;margin-bottom:7px;line-height:1.55}
.course-card li::before{content:"";position:absolute;left:0;top:9px;width:7px;height:7px;background:var(--yellow);
  border-radius:2px;transform:rotate(45deg)}
.cc-foot{display:flex;justify-content:space-between;align-items:flex-end;border-top:1px dashed var(--line);padding-top:15px;gap:10px}
.cc-price{color:var(--red);font-weight:900;white-space:nowrap}
.cc-price small{font-size:13px;font-weight:400;color:var(--gray);display:block}
.cc-price b{font-size:26px}
.cc-foot .mini-btn{background:#FDF1F0;color:var(--red);font-size:13.5px;font-weight:700;padding:8px 16px;border-radius:5px;white-space:nowrap}
.cc-foot .mini-btn:hover{background:var(--red);color:#fff}
.course-note{margin-top:20px;background:#FFF9E6;border:1px solid #F5DFA0;border-radius:8px;padding:14px 20px;
  font-size:13.5px;color:#7A5B00;line-height:1.8}

/* ---------- 考证 ---------- */
.cert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cert-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);
  display:flex;flex-direction:column;transition:.2s}
.cert-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.cert-top{padding:24px 24px 20px;color:#fff;position:relative}
.cert-card:nth-child(1) .cert-top{background:linear-gradient(135deg,var(--red),var(--red-dark))}
.cert-card:nth-child(2) .cert-top{background:linear-gradient(135deg,#21508F,var(--blue))}
.cert-card:nth-child(3) .cert-top{background:linear-gradient(135deg,#E8A900,var(--yellow-dark))}
.cert-top .ct-ico{width:42px;height:42px;border-radius:9px;background:rgba(255,255,255,.18);
  display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.cert-top h3{font-size:20px;font-weight:800}
.cert-top .from{font-size:12.5px;opacity:.92;margin-top:4px;line-height:1.6}
.cert-body{padding:20px 24px;flex:1;display:flex;flex-direction:column}
.cert-body li{font-size:14px;color:var(--ink-2);padding:7px 0;border-bottom:1px dashed var(--line)}
.cert-body li:last-of-type{border-bottom:none}
.cert-body .ct-price{margin:14px 0;font-size:14px;color:var(--ink-2);line-height:1.7}
.cert-body .ct-price b{color:var(--red);font-size:24px;font-weight:900}
.cert-body .mini-btn{align-self:flex-start;margin-top:auto;background:var(--ink);color:#fff;font-size:13.5px;
  font-weight:700;padding:8px 18px;border-radius:5px}
.cert-body .mini-btn:hover{background:var(--red)}
.cert-disclaim{margin-top:22px;text-align:center;font-size:12.5px;color:var(--gray);line-height:1.8}

/* ---------- 优势 ---------- */
.adv-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.adv-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 14px;text-align:center;transition:.2s}
.adv-item:hover{border-color:var(--red);box-shadow:var(--shadow-sm);transform:translateY(-4px)}
.adv-ico{width:56px;height:56px;margin:0 auto 14px;border-radius:50%;background:#FDF1F0;
  display:flex;align-items:center;justify-content:center}
.adv-item h4{font-size:16px;font-weight:800;margin-bottom:7px}
.adv-item p{font-size:12.5px;color:var(--gray);line-height:1.55}

/* ---------- 师资 ---------- */
.teacher-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.teacher-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);
  display:flex;transition:.2s}
.teacher-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.tc-photo{width:200px;flex-shrink:0;position:relative}
.tc-photo img{width:100%;height:100%;object-fit:cover}
.tc-photo span{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(transparent,rgba(0,0,0,.75));
  color:#fff;text-align:center;padding:24px 8px 10px;font-size:14px;font-weight:700}
.tc-body{padding:22px 24px}
.tc-body h3{font-size:20px;font-weight:800;margin-bottom:4px}
.tc-body .exp{color:var(--red);font-size:13px;font-weight:700;margin-bottom:12px}
.tc-body li{font-size:13.5px;color:var(--ink-2);padding-left:16px;position:relative;margin-bottom:6px}
.tc-body li::before{content:"";position:absolute;left:0;top:10px;width:6px;height:2px;background:var(--red)}

/* ---------- FAQ ---------- */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:8px;margin-bottom:12px;overflow:hidden}
.faq-item summary{list-style:none;cursor:pointer;padding:19px 24px;font-size:16.5px;font-weight:700;
  display:flex;justify-content:space-between;align-items:center;gap:14px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:24px;color:var(--red);font-weight:400;transition:.2s;flex-shrink:0}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item[open] summary{color:var(--red)}
.faq-item .faq-a{padding:0 24px 20px;color:var(--ink-2);font-size:14.5px}
.faq-more{text-align:center;margin-top:26px}

/* ---------- 新闻 ---------- */
.news-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.news-col h3{font-size:20px;font-weight:800;padding-bottom:14px;border-bottom:3px solid var(--red);
  display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px}
.news-col h3 a{font-size:13px;color:var(--gray);font-weight:400}
.news-col h3 a:hover{color:var(--red)}
.news-item{padding:16px 4px;border-bottom:1px dashed var(--line)}
.news-item>a{display:flex;gap:16px;align-items:flex-start;min-width:0}
.news-item>a>div{min-width:0;flex:1}
.news-item .nd{width:62px;height:62px;flex-shrink:0;background:#FDF1F0;border-radius:8px;text-align:center;
  padding-top:9px;color:var(--red)}
.news-item .nd b{display:block;font-size:23px;line-height:1;font-family:Arial}
.news-item .nd span{font-size:12px}
.news-item h4{font-size:16px;font-weight:700;margin-bottom:5px;line-height:1.5;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.news-item:hover h4{color:var(--red)}
.news-item p{font-size:13px;color:var(--gray);line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-item .tag{display:inline-block;font-size:11px;background:#EEF3FB;color:var(--blue);
  padding:1px 8px;border-radius:3px;margin-right:7px;font-weight:700;vertical-align:2px}
.news-item .tag.weld{background:#FDF1F0;color:var(--red)}

/* ---------- CTA ---------- */
.cta{background:linear-gradient(120deg,var(--red-deep),var(--red));color:#fff;padding:48px 0}
.cta .wrap{display:flex;align-items:center;justify-content:space-between;gap:30px}
.cta h2{font-size:29px;font-weight:900;margin-bottom:8px}
.cta p{color:rgba(255,255,255,.9);font-size:15.5px}
.cta .btn{padding:16px 44px;font-size:18px}

/* ---------- 页脚 ---------- */
.footer{background:#1D2025;color:#A8AEB8;padding:54px 0 0;font-size:13.5px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.35fr;gap:34px;padding-bottom:38px}
.footer .logo-name{color:#fff;font-size:16px;white-space:normal;line-height:1.4}
.footer .logo-name small{color:#7C838E}
.foot-about p{margin-top:16px;line-height:1.8}
.foot-qual{margin-top:14px;font-size:12.5px;color:#7C838E;line-height:1.9}
.footer h5{color:#fff;font-size:16px;margin-bottom:18px;font-weight:800;position:relative;padding-left:12px}
.footer h5::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:3px;background:var(--red);border-radius:2px}
.foot-links li{margin-bottom:11px}
.foot-links a:hover{color:var(--yellow)}
.foot-contact li{margin-bottom:13px;display:flex;gap:9px;line-height:1.6}
.foot-contact .fi{color:var(--yellow);flex-shrink:0}
.foot-contact b{color:#DDE1E7;font-weight:700}
.foot-bottom{border-top:1px solid #2C3037;padding:18px 0;text-align:center;font-size:12.5px;color:#6E757F;line-height:1.8}
.foot-bottom a:hover{color:var(--yellow)}

/* ---------- 悬浮工具栏 ---------- */
.float-bar{position:fixed;right:18px;bottom:90px;z-index:90;width:62px}
.fb-item{width:62px;height:62px;background:#fff;box-shadow:0 6px 18px rgba(0,0,0,.15);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  font-size:11.5px;color:var(--ink-2);position:relative;cursor:pointer;border-bottom:1px solid #f0f0f0}
.fb-item:first-child{border-radius:10px 10px 0 0}
.fb-item:last-child{border-radius:0 0 10px 10px;border-bottom:none}
.fb-item.call{background:var(--red);color:#fff}
.fb-item:hover{background:#FDF1F0}
.fb-item.call:hover{background:var(--red-dark)}
.fb-qr{position:absolute;right:72px;top:0;width:150px;background:#fff;box-shadow:var(--shadow);
  border-radius:8px;padding:12px;display:none;text-align:center;color:var(--ink)}
.fb-item:hover .fb-qr{display:block}
.fb-qr .qrbox{height:120px;background:#F2F3F5;border-radius:6px;display:flex;align-items:center;
  justify-content:center;color:var(--gray);font-size:12px;line-height:1.6;margin-bottom:6px}
.fb-totop{margin-top:8px;border-radius:10px !important}

/* ============================================================
   响应式
   ============================================================ */

/* --- 中等PC / 小屏笔记本：保证导航一行不换行 --- */
@media (max-width:1280px){
  .logo-name{font-size:16px}
  .logo-mark{width:44px;height:44px}
  .nav>li>a{padding:29px 7px 27px;font-size:14.5px}
  .header .btn{padding:10px 15px}
  .hero h1{font-size:38px}
}

/* --- 平板及以下：汉堡菜单 --- */
@media (max-width:1024px){
  .header .wrap{height:64px;gap:12px}
  .topbar .tb-right span:last-child{display:none}
  .logo{min-width:0}
  .logo-mark{width:42px;height:42px}
  .logo-name{font-size:16px;min-width:0;white-space:normal}
  .header .btn{display:none}
  /* 汉堡按钮：抽屉滑出后仍浮于最上层，变 X 可直接关闭 */
  .nav-toggle{display:flex;order:3;position:relative;z-index:320}

  .nav{position:fixed;top:0;right:-86%;width:82%;max-width:340px;height:100vh;height:100dvh;
    background:#fff;flex-direction:column;align-items:stretch;gap:0;margin:0;padding:78px 0 30px;
    overflow-y:auto;box-shadow:-10px 0 40px rgba(0,0,0,.18);transition:right .3s ease;z-index:300}
  .nav.open{right:0}
  .nav>li{position:relative}
  .nav>li>a{padding:15px 58px 15px 24px;font-size:16px;border-bottom:1px solid #F1F2F4}
  .nav>li>a::after{display:none}
  /* 手机端隐藏链接内的小三角，改用右侧独立展开按钮 */
  .nav .caret{display:none}
  .sub-toggle{display:flex;align-items:center;justify-content:center;position:absolute;top:0;right:0;
    width:56px;height:51px;background:none;border:none;border-left:1px solid #F1F2F4;
    cursor:pointer;z-index:2}
  .sub-toggle span{display:block;font-size:11px;color:var(--gray);transition:transform .25s}
  .nav>li.open .sub-toggle span{transform:rotate(180deg);color:var(--red)}
  .submenu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border-radius:0;
    background:#FAFAFB;max-height:0;padding:0 0;overflow:hidden;transition:max-height .3s ease}
  .nav>li.open .submenu{max-height:520px;padding:6px 0}
  .submenu a{padding:12px 24px 12px 40px;font-size:14.5px;border-bottom:1px solid #F1F2F4}
  .submenu a:hover{padding-left:44px}
  /* 抽屉内关闭钮与右上角汉堡变X位置重合，手机端隐藏，统一用汉堡X/遮罩关闭 */
  .nav-close{display:none;align-items:center;justify-content:center;position:absolute;top:18px;right:18px;
    width:38px;height:38px;border:none;background:#F5F6F8;border-radius:50%;font-size:20px;line-height:1;
    color:var(--ink);cursor:pointer;padding:0}

  .hero .wrap{flex-direction:column;align-items:stretch;gap:34px;padding:48px 16px 56px}
  .sign-card{width:100%;max-width:480px;margin:0 auto}
  .hero h1{font-size:32px}
  .hero p.sub{font-size:15.5px}

  .quick{margin-top:-34px}
  .quick-grid{grid-template-columns:1fr;gap:16px;max-width:560px;margin:0 auto}
  .qc-img{height:190px}

  .stat-grid{grid-template-columns:repeat(3,1fr);gap:26px 10px}
  .section{padding:52px 0}
  .sec-head h2{font-size:27px}
  .about-grid{grid-template-columns:1fr;gap:30px}
  .about-img img{height:300px}
  .course-grid{grid-template-columns:1fr 1fr}
  .course-sub h3{font-size:18px;white-space:normal}
  .cert-grid{grid-template-columns:1fr;max-width:560px;margin:0 auto}
  .adv-grid{grid-template-columns:repeat(3,1fr)}
  .teacher-grid,.news-grid{grid-template-columns:1fr;gap:20px}
  .cta .wrap{flex-direction:column;text-align:center}
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px}
}

/* --- 手机 --- */
@media (max-width:768px){
  body{font-size:14.5px}
  .topbar{font-size:12px}
  .topbar .wrap{height:auto;padding:8px 0;line-height:1.6;flex-direction:column;
    align-items:flex-start;gap:3px}
  .topbar .tb-right{gap:2px 14px;flex-wrap:wrap;white-space:normal}
  .topbar .tb-right span{white-space:normal;word-break:break-word}
  .hero h1{font-size:26px}
  .hero-tags span{font-size:12px;padding:4px 11px}
  .hero-btns .btn{flex:1;padding:14px 20px;font-size:15.5px;min-width:140px}
  .hero-points{gap:14px 22px;margin-top:26px;font-size:13px}
  .hero-points b{font-size:17px}
  .sign-card{padding:22px 18px}

  .stat-grid{grid-template-columns:1fr 1fr;gap:22px 10px}
  .stat-item b{font-size:32px}
  .stat-item span{font-size:13px}

  .section{padding:42px 0}
  .sec-head{margin-bottom:30px}
  .sec-head h2{font-size:23px}
  .sec-head .desc{font-size:13.5px}

  .course-grid{grid-template-columns:1fr}
  .course-sub{flex-wrap:wrap;margin-bottom:18px}
  .course-sub .line{display:none}
  .course-sub h3{font-size:17px;flex:1;min-width:60%}
  .adv-grid{grid-template-columns:1fr 1fr;gap:12px}
  .adv-item{padding:22px 10px}

  .teacher-card{flex-direction:column}
  .tc-photo{width:100%;height:210px}
  .about-text h2{font-size:23px}
  .cta{padding:38px 0}
  .cta h2{font-size:22px}
  .cta .btn{width:100%;padding:15px 24px}
  .foot-grid{grid-template-columns:1fr;gap:26px}
  .float-bar{right:10px;bottom:70px;width:54px}
  .fb-item{width:54px;height:54px;font-size:11px}
  .faq-item summary{font-size:15px;padding:16px 18px}
  .faq-item .faq-a{padding:0 18px 16px}
  .news-item h4{white-space:normal}
}

/* --- 小屏手机 --- */
@media (max-width:400px){
  .hero h1{font-size:23px}
  .logo-name{font-size:14.5px}
  .logo-name small{letter-spacing:1px}
  .adv-grid{grid-template-columns:1fr}
  .qc-price b{font-size:18px}
}