/* ==========================================================================
   云学谷智慧教育 · 招商官网 样式系统
   设计原则：移动优先 H5 响应式 / 系统中文字体 / 招商转化导向 / 自托管无外链
   更新静态资源后请同步 index.html 等页面里 site.css?v= 的版本号（nginx 7天强缓存）
   ========================================================================== */

:root{
  --brand:#4f46e5;
  --brand-2:#2563eb;
  --brand-light:#6366f1;
  --accent:#0ea5e9;
  --accent-2:#14b8a6;
  --gold:#f59e0b;
  --gold-deep:#d97706;
  --ink:#0f172a;
  --ink-2:#1e293b;
  --muted:#64748b;
  --muted-2:#94a3b8;
  --line:#e6e9f0;
  --bg:#ffffff;
  --bg-soft:#f7f9fc;
  --bg-tint:#eef2ff;
  --bg-tint-2:#ecfeff;
  --radius:20px;
  --radius-sm:14px;
  --radius-lg:28px;
  --shadow-sm:0 6px 18px rgba(15,23,42,.06);
  --shadow:0 18px 50px rgba(15,23,42,.10);
  --shadow-lg:0 30px 70px rgba(15,23,42,.16);
  --grad:linear-gradient(135deg,var(--brand),var(--brand-2));
  --grad-soft:linear-gradient(135deg,#eef2ff,#ecfeff);
  --maxw:1200px;
  --nav-h:64px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","微软雅黑",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.75;
  overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
ul,ol{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
:focus-visible{outline:3px solid var(--brand-light);outline-offset:2px}

.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.section{padding:72px 0}
.section-sm{padding:48px 0}
.bg-soft{background:var(--bg-soft)}
.bg-tint{background:linear-gradient(180deg,#f5f7ff, #ffffff)}

/* ---------- 文字/标题 ---------- */
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--brand);background:var(--bg-tint);padding:6px 14px;border-radius:999px;margin-bottom:16px}
h1,h2,h3{line-height:1.25;font-weight:800;color:var(--ink)}
.h-sec{font-size:clamp(26px,4vw,38px);margin-bottom:14px}
.sec-sub{color:var(--muted);font-size:16px;max-width:680px;margin:0 auto 40px;text-align:center}
.lead{font-size:17px;color:var(--ink-2)}
.muted{color:var(--muted)}
.center{text-align:center}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;font-size:16px;padding:13px 28px;border-radius:999px;transition:.2s;white-space:nowrap}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 12px 30px rgba(79,70,229,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 40px rgba(79,70,229,.42)}
.btn-ghost{background:#fff;color:var(--brand);border:1.5px solid var(--line);box-shadow:var(--shadow-sm)}
.btn-ghost:hover{border-color:var(--brand-light);background:var(--bg-tint)}
.btn-gold{background:linear-gradient(135deg,var(--gold),var(--gold-deep));color:#fff;box-shadow:0 12px 30px rgba(245,158,11,.32)}
.btn-gold:hover{transform:translateY(-2px)}
.btn-lg{padding:16px 38px;font-size:17px}
.btn-block{width:100%}

/* ---------- 顶部导航 ---------- */
.nav{position:sticky;top:0;z-index:200;height:var(--nav-h);background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}
.nav .wrap{height:100%;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--ink)}
.brand .logo{width:34px;height:34px;border-radius:9px;background:var(--grad);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900;font-size:18px;box-shadow:var(--shadow-sm)}
.brand .logo-img{width:34px;height:34px;border-radius:9px;object-fit:cover;box-shadow:var(--shadow-sm);flex:none}
.brand small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.04em}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{padding:8px 14px;border-radius:10px;font-weight:600;font-size:15px;color:var(--ink-2);transition:.15s}
.nav-links a:hover,.nav-links a.active{color:var(--brand);background:var(--bg-tint)}
.nav-cta{margin-left:8px}
.nav-toggle{display:none;width:42px;height:42px;border-radius:10px;align-items:center;justify-content:center}
.nav-toggle svg{width:24px;height:24px;stroke:var(--ink)}

/* 移动抽屉 */
.drawer-mask{position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:300;opacity:0;visibility:hidden;transition:.25s}
.drawer-mask.open{opacity:1;visibility:visible}
.drawer{position:fixed;top:0;right:0;height:100%;width:78%;max-width:340px;background:#fff;z-index:310;transform:translateX(100%);transition:.28s;padding:24px;display:flex;flex-direction:column;gap:6px;box-shadow:var(--shadow-lg)}
.drawer.open{transform:translateX(0)}
.drawer a{padding:14px 12px;border-radius:12px;font-weight:600;font-size:16px;border-bottom:1px solid var(--line)}
.drawer .btn{margin-top:14px}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;background:radial-gradient(1200px 600px at 80% -10%,#e0e7ff 0%,transparent 60%),linear-gradient(180deg,#f5f7ff,#ffffff)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding:64px 20px 72px}
.hero h1{font-size:clamp(30px,5vw,52px);margin-bottom:18px}
.hero p.lead{font-size:18px;margin-bottom:28px;max-width:560px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:30px}
.hero-badges{display:flex;gap:10px;flex-wrap:wrap}
.hero-badges span{font-size:13px;font-weight:600;color:var(--brand);background:#fff;border:1px solid var(--line);padding:7px 14px;border-radius:999px;box-shadow:var(--shadow-sm)}
.hero-visual{position:relative}
.hero-card{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:26px;position:relative;z-index:2}
.hero-card .hc-row{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px dashed var(--line)}
.hero-card .hc-row:last-child{border-bottom:none}
.hero-card .ic{width:44px;height:44px;border-radius:12px;background:var(--grad-soft);display:flex;align-items:center;justify-content:center;color:var(--brand);flex:none}
.hero-card .ic svg{width:24px;height:24px}
.hero-card h4{font-size:16px}
.hero-card p{font-size:13px;color:var(--muted)}
.hero-blob{position:absolute;width:280px;height:280px;border-radius:50%;background:conic-gradient(from 120deg,var(--brand-light),var(--accent),var(--accent-2),var(--brand-light));filter:blur(60px);opacity:.4;z-index:1;top:-40px;right:-40px}

/* ---------- 数据看板 ---------- */
.stats{background:var(--grad);color:#fff;border-radius:var(--radius-lg);padding:34px 28px;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;box-shadow:var(--shadow)}
.stats .s b{display:block;font-size:clamp(26px,4vw,38px);font-weight:900;line-height:1.1}
.stats .s span{font-size:14px;opacity:.9}
.stats .s{text-align:center;position:relative}
.stats .s:not(:last-child)::after{content:"";position:absolute;right:-10px;top:10%;height:80%;width:1px;background:rgba(255,255,255,.25)}

/* ---------- 通用网格/卡片 ---------- */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm);transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card .ic{width:52px;height:52px;border-radius:14px;background:var(--grad-soft);display:flex;align-items:center;justify-content:center;color:var(--brand);margin-bottom:16px}
.card .ic svg{width:28px;height:28px}
.card h3{font-size:19px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15px}

/* 产品卡 */
.prod-card{position:relative;overflow:hidden;border-radius:var(--radius-lg);padding:32px;color:#fff;box-shadow:var(--shadow);display:flex;flex-direction:column;min-height:300px}
.prod-card.a{background:linear-gradient(135deg,#4f46e5,#2563eb)}
.prod-card.b{background:linear-gradient(135deg,#0ea5e9,#14b8a6)}
.prod-card.c{background:linear-gradient(135deg,#d97706,#f59e0b)}
.prod-card .tag{font-size:13px;font-weight:700;opacity:.9;letter-spacing:.08em}
.prod-card h3{color:#fff;font-size:26px;margin:6px 0 12px}
.prod-card p{color:rgba(255,255,255,.9);font-size:15px}
.prod-card ul{margin:16px 0 22px;display:flex;flex-direction:column;gap:8px}
.prod-card li{display:flex;gap:8px;align-items:flex-start;font-size:14px;color:rgba(255,255,255,.95)}
.prod-card li svg{width:18px;height:18px;flex:none;margin-top:4px}
.prod-card .btn{margin-top:auto;align-self:flex-start;background:#fff;color:var(--brand)}

/* 步骤 */
.steps{counter-reset:step;display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 20px;text-align:center;box-shadow:var(--shadow-sm)}
.step::before{counter-increment:step;content:counter(step);width:40px;height:40px;border-radius:50%;background:var(--grad);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-size:18px}
.step h4{font-size:17px;margin-bottom:6px}
.step p{font-size:13px;color:var(--muted)}

/* 支持网格 */
.support{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.support .it{background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:20px;text-align:center;box-shadow:var(--shadow-sm)}
.support .it .ic{width:46px;height:46px;border-radius:12px;background:var(--grad-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;margin:0 auto 12px}
.support .it .ic svg{width:24px;height:24px}
.support .it h4{font-size:16px;margin-bottom:4px}
.support .it p{font-size:13px;color:var(--muted)}

/* 案例 */
.case{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);display:flex;flex-direction:column}
.case .ph{height:170px;background:var(--grad-soft);display:flex;align-items:center;justify-content:center;color:var(--brand-light)}
.case .ph svg{width:54px;height:54px;opacity:.8}
.case .body{padding:22px}
.case .body .meta{font-size:12px;color:var(--gold-deep);font-weight:700;margin-bottom:6px}
.case .body h4{font-size:17px;margin-bottom:8px}
.case .body p{font-size:14px;color:var(--muted)}

/* FAQ */
.faq{max-width:860px;margin:0 auto}
.faq .item{border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:12px;background:#fff;overflow:hidden}
.faq .q{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:18px 22px;font-weight:700;font-size:16px;cursor:pointer}
.faq .q .ar{width:26px;height:26px;flex:none;border-radius:50%;background:var(--bg-tint);color:var(--brand);display:flex;align-items:center;justify-content:center;transition:.2s;font-size:18px}
.faq .item.open .ar{transform:rotate(45deg)}
.faq .a{max-height:0;overflow:hidden;transition:max-height .3s;padding:0 22px;color:var(--muted);font-size:15px}
.faq .item.open .a{max-height:320px;padding:0 22px 20px}

/* CTA 横幅 */
.cta{background:linear-gradient(135deg,#1e1b4b,#312e81);color:#fff;border-radius:var(--radius-lg);padding:54px 40px;text-align:center;box-shadow:var(--shadow-lg)}
.cta h2{color:#fff;font-size:clamp(24px,4vw,34px);margin-bottom:12px}
.cta p{color:rgba(255,255,255,.85);max-width:600px;margin:0 auto 26px;font-size:16px}

/* 联系 */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.contact .info .row{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid var(--line)}
.contact .info .ic{width:42px;height:42px;border-radius:11px;background:var(--grad-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;flex:none}
.contact .info .ic svg{width:22px;height:22px}
.contact .info h4{font-size:15px}
.contact .info p{color:var(--muted);font-size:14px}
.form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm)}
.form label{display:block;font-weight:600;font-size:14px;margin:14px 0 6px}
.form input,.form select,.form textarea{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:11px;font-size:15px;font-family:inherit;background:#fff;transition:.15s}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--brand-light);outline:none;box-shadow:0 0 0 3px var(--bg-tint)}
.form textarea{resize:vertical;min-height:96px}
.form .hint{font-size:12px;color:var(--muted);margin-top:6px}
.form .ok{display:none;background:#ecfdf5;color:#047857;border:1px solid #a7f3d0;padding:12px 14px;border-radius:11px;font-size:14px;margin-top:14px}
.form .err{display:none;background:#fef2f2;color:#b91c1c;border:1px solid #fecaca;padding:12px 14px;border-radius:11px;font-size:14px;margin-top:14px}

/* 页脚 */
.footer{background:var(--ink);color:#cbd5e1;padding:54px 0 28px;margin-top:40px}
.footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
.footer .brand{color:#fff;margin-bottom:14px}
.footer h5{color:#fff;font-size:15px;margin-bottom:14px}
.footer a{display:block;color:#cbd5e1;font-size:14px;padding:5px 0;transition:.15s}
.footer a:hover{color:#fff}
.footer p{font-size:14px;line-height:1.9}
.footer .bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:20px;font-size:13px;color:#94a3b8;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.footer .bottom a{display:inline;color:#94a3b8}

/* 面包屑 / 子页头 */
.page-hero{background:var(--grad-soft);padding:48px 0 40px;border-bottom:1px solid var(--line)}
.page-hero h1{font-size:clamp(26px,4vw,40px);margin-bottom:10px}
.page-hero p{color:var(--muted);max-width:720px}
.crumb{font-size:13px;color:var(--muted);margin-bottom:12px}
.crumb a{color:var(--brand)}

/* 浮动咨询 */
.float-cta{position:fixed;right:18px;bottom:18px;z-index:220;display:flex;flex-direction:column;gap:10px}
.float-cta a{width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);color:#fff;background:var(--grad)}
.float-cta a svg{width:26px;height:26px}
.float-cta .wk{background:linear-gradient(135deg,#07c160,#04a152)}

/* 标注/提示 */
.note{font-size:13px;color:var(--muted);background:var(--bg-soft);border:1px dashed var(--line);border-radius:12px;padding:12px 16px;margin-top:16px}

/* ---------- 响应式 ---------- */
@media(min-width:640px){}
@media(max-width:1024px){
  .hero .wrap{grid-template-columns:1fr;gap:32px}
  .hero-visual{max-width:520px}
  .steps{grid-template-columns:repeat(3,1fr)}
  .support{grid-template-columns:repeat(2,1fr)}
  .footer .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .section{padding:54px 0}
  .nav-links{display:none}
  .nav-cta{display:none}
  .nav-toggle{display:flex}
  .grid-3,.grid-4{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr);gap:18px}
  .stats .s:not(:last-child)::after{display:none}
  .steps{grid-template-columns:1fr 1fr}
  .contact{grid-template-columns:1fr;gap:24px}
  .footer .cols{grid-template-columns:1fr 1fr}
  .float-cta{right:12px;bottom:12px}
}
@media(max-width:480px){
  .wrap{padding:0 16px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .support{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:1fr 1fr}
  .hero h1{font-size:30px}
  .btn{padding:12px 22px;font-size:15px}
  .footer .cols{grid-template-columns:1fr}
  .cta{padding:40px 22px}
}