/* ===== Гуаньцзяо (RU) — стили ===== */
:root{
  --blue:#1d4ed8; --blue-d:#1e3a8a; --steel:#0f172a; --ink:#0f172a;
  --muted:#64748b; --line:#e2e8f0; --bg:#f8fafc; --card:#fff;
  --ok:#16a34a; --err:#dc2626; --radius:12px;
}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI",Roboto,Arial,"Helvetica Neue",sans-serif;
  color:var(--ink);background:#fff;line-height:1.6;font-size:16px}
a{color:var(--blue);text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:1180px;margin:0 auto;padding:0 20px}
.narrow{max-width:860px}
.center{text-align:center;margin-top:28px}

/* Topbar */
.topbar{background:var(--steel);color:#cbd5e1;font-size:13px}
.topbar-in{display:flex;justify-content:space-between;align-items:center;padding:8px 20px;flex-wrap:wrap;gap:8px}
.topbar-left a{color:#cbd5e1;margin-right:16px;white-space:nowrap}
.topbar-left a:hover{color:#fff}
.btn-call{background:var(--blue);color:#fff;padding:6px 14px;border-radius:20px;font-weight:600}
.btn-call:hover{background:#2563eb}

/* Header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.header-in{display:flex;align-items:center;justify-content:space-between;height:72px;gap:16px}
.logo{display:flex;align-items:center;gap:12px;color:var(--ink)}
.logo-mark{background:var(--blue);color:#fff;font-weight:800;width:42px;height:42px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px}
.logo-text{display:flex;flex-direction:column;font-weight:700;line-height:1.1}
.logo-text small{font-weight:400;color:var(--muted);font-size:11px;max-width:240px}
.main-nav{display:flex;gap:22px}
.main-nav a{color:#334155;font-weight:500;padding:6px 0;border-bottom:2px solid transparent}
.main-nav a:hover,.main-nav a.active{color:var(--blue);border-color:var(--blue)}
.menu-toggle{display:none;background:none;border:0;font-size:26px;cursor:pointer;color:var(--steel)}

/* Hero */
.hero{background:linear-gradient(135deg,#0f172a,#1e3a8a);color:#fff;padding:72px 0}
.hero h1{font-size:42px;line-height:1.15;margin:0 0 16px}
.hero p{font-size:18px;max-width:680px;color:#cbd5e1;margin:0 0 26px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{background:var(--blue);color:#fff;padding:12px 24px;border-radius:8px;font-weight:600;display:inline-block;border:0;cursor:pointer}
.btn-primary:hover{background:#2563eb}
.btn-ghost{background:#fff;color:var(--blue);border:1px solid var(--blue);padding:11px 22px;border-radius:8px;font-weight:600;display:inline-block}
.btn-ghost:hover{background:#eff6ff}

/* Stats */
.stats{background:var(--bg);border-bottom:1px solid var(--line)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.stats-grid>div{padding:26px 20px;text-align:center;border-right:1px solid var(--line)}
.stats-grid>div:last-child{border-right:0}
.stats-grid b{display:block;font-size:30px;color:var(--blue)}
.stats-grid span{color:var(--muted);font-size:13px}

/* Sections */
.section{padding:64px 0}
.section.alt{background:var(--bg)}
.section-title{font-size:30px;text-align:center;margin:0 0 36px}
.page-title{font-size:34px;margin:0 0 18px}
.lead{font-size:18px;color:#475569;margin:0 0 28px}

/* Card grid */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.card:hover{box-shadow:0 10px 30px rgba(15,23,42,.12);transform:translateY(-3px)}
.card-img{height:200px;width:100%;object-fit:cover;background:#e2e8f0}
.img-ph{height:200px;width:100%;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1e3a8a,#0f172a);color:#fff;font-weight:800;font-size:40px;letter-spacing:2px}
.card-body{padding:18px;flex:1;display:flex;flex-direction:column}
.card-body h3{font-size:18px;margin:8px 0;line-height:1.3}
.card-body p{color:var(--muted);font-size:14px;margin:0 0 12px;flex:1}
.tag{display:inline-block;background:#eff6ff;color:var(--blue);font-size:12px;font-weight:600;padding:2px 10px;border-radius:20px;margin-right:6px}
.tag.alt{background:#f1f5f9;color:#475569}
.more{color:var(--blue);font-weight:600;font-size:14px}

/* Applications */
.app-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.app-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center}
.app-ico{color:var(--blue);font-size:22px}
.app-item h4{margin:10px 0 6px;font-size:16px}
.app-item p{color:var(--muted);font-size:13px;margin:0}

/* Features */
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.feat h4{margin:0 0 8px;color:var(--blue)}

/* CTA band */
.cta-band{background:linear-gradient(135deg,#1e3a8a,#0f172a);color:#fff;text-align:center;padding:56px 0}
.cta-band h2{font-size:28px;margin:0 0 12px}
.cta-band p{max-width:640px;margin:0 auto 22px;color:#cbd5e1}

/* Footer */
.site-footer{background:var(--steel);color:#cbd5e1;padding:48px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:28px}
.footer-grid h4{color:#fff;margin:0 0 14px}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin:6px 0}
.footer-grid a{color:#cbd5e1}
.footer-grid a:hover{color:#fff}
.footer-bottom{border-top:1px solid #1e293b;margin-top:32px;padding:18px 20px;display:flex;justify-content:space-between;font-size:13px;flex-wrap:wrap;gap:8px}

/* Product detail */
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:18px}
.breadcrumb a{color:var(--muted)}
.product-detail{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.product-img{height:380px;width:100%;object-fit:cover;border-radius:var(--radius);background:#e2e8f0}
.product-info h1{font-size:30px;margin:10px 0 14px}
.summary{font-size:17px;color:#334155}
.spec-table{width:100%;border-collapse:collapse;margin:18px 0}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:10px 12px;text-align:left;font-size:14px}
.spec-table th{background:var(--bg);width:45%;color:#475569}
.product-actions{display:flex;gap:12px;margin-top:18px;flex-wrap:wrap}
.product-desc{margin-top:40px}
.prose{font-size:16px;color:#334155;white-space:pre-wrap}
.cta-inline{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px;margin-top:40px;text-align:center}
.cta-inline h3{margin:0 0 8px}
.cta-inline p{color:var(--muted);margin:0 0 16px}

/* About / applications */
.about-cols{display:grid;grid-template-columns:1fr 1fr;gap:36px}
.tick{list-style:none;padding:0;margin:0}
.tick li{padding-left:24px;position:relative;margin:8px 0}
.tick li:before{content:"✓";color:var(--ok);position:absolute;left:0;font-weight:700}
.app-list{display:flex;flex-direction:column;gap:14px}
.app-block{display:flex;gap:18px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;scroll-margin-top:90px}
.app-num{color:var(--blue);font-size:24px}
.app-block h3{margin:0 0 6px}
.app-block h3 small{color:var(--muted);font-weight:400;font-size:14px}

/* Certificates */
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.cert-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-align:center}
.cert-badge{width:56px;height:56px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-weight:800}
.note-box{background:#eff6ff;border:1px solid #bfdbfe;border-radius:var(--radius);padding:26px;margin-top:28px}

/* News */
.date{color:var(--muted);font-size:13px}
.article-img{height:320px;width:100%;object-fit:cover;border-radius:var(--radius);background:#e2e8f0;margin:16px 0}
.article .prose{margin-top:8px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:40px}
.contact-list{list-style:none;padding:0;margin:16px 0}
.contact-list li{padding:8px 0;border-bottom:1px solid var(--line)}
.form{display:flex;flex-direction:column;gap:6px}
.form label{font-size:13px;font-weight:600;color:#334155;margin-top:10px}
.form input,.form textarea,.admin-form input,.admin-form select,.admin-form textarea{
  padding:11px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;background:#fff;width:100%}
.form textarea{min-height:110px;resize:vertical}
.msg-ok{background:#dcfce7;color:#14532d;border:1px solid #86efac;padding:14px;border-radius:8px;margin-bottom:18px}
.msg-err{background:#fee2e2;color:#7f1d1d;border:1px solid #fca5a5;padding:12px;border-radius:8px;margin-bottom:16px}
.empty{color:var(--muted);padding:30px;background:var(--bg);border-radius:var(--radius);text-align:center}

/* Search & filter */
.search-bar{display:flex;gap:10px;margin-bottom:18px;max-width:520px}
.search-bar input{flex:1;padding:11px 14px;border:1px solid var(--line);border-radius:8px;font:inherit}
.search-bar button{padding:11px 22px;background:var(--blue);color:#fff;border:0;border-radius:8px;cursor:pointer;font-weight:600}
.cat-filter{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.cat-filter a{background:var(--bg);border:1px solid var(--line);padding:7px 16px;border-radius:20px;color:#475569;font-size:14px}
.cat-filter a.active,.cat-filter a:hover{background:var(--blue);color:#fff;border-color:var(--blue)}

/* ===== Admin ===== */
body.admin{background:#f1f5f9}
.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh}
.login-box{background:#fff;padding:38px;border-radius:14px;width:360px;max-width:92vw;box-shadow:0 10px 40px rgba(0,0,0,.15)}
.login-box h1{margin:0 0 4px;font-size:22px}
.login-box .sub{color:var(--muted);font-size:13px;margin:0 0 22px}
.login-box label{display:block;font-size:13px;margin:12px 0 6px}
.login-box input{width:100%;padding:11px;border:1px solid var(--line);border-radius:8px;font:inherit}
.login-box button{width:100%;margin-top:20px}
.admin-bar{background:var(--steel);color:#fff}
.admin-bar-in{display:flex;align-items:center;justify-content:space-between;padding:0 20px;height:56px;flex-wrap:wrap;gap:8px}
.admin-logo{color:#fff;font-weight:700}
.admin-nav{display:flex;gap:14px;flex-wrap:wrap}
.admin-nav a{color:#cbd5e1;font-size:14px;padding:6px 0}
.admin-nav a:hover,.admin-nav a.active{color:#fff;border-bottom:2px solid var(--blue)}
.admin-main{padding:30px 20px 50px}
.admin-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:28px}
.acard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.acard b{font-size:28px;color:var(--blue);display:block}
.acard span{color:var(--muted);font-size:13px}
.acard a{display:inline-block;margin-top:8px;font-size:13px}
.admin-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:22px}
.admin-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.admin-table th,.admin-table td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
.admin-table th{background:var(--bg);color:#475569;font-weight:600}
.admin-table.plain th{width:160px;background:var(--bg)}
.row-actions a{margin-right:12px;font-size:13px}
.row-actions a.del{color:var(--err)}
.msg-body{background:var(--bg);border-radius:8px;padding:16px;margin:14px 0;white-space:pre-wrap}
.admin-form{max-width:760px;display:flex;flex-direction:column}
.admin-form label{font-size:13px;font-weight:600;margin-top:14px;color:#334155}
.admin-form.inline{flex-direction:row;flex-wrap:wrap;gap:10px;align-items:flex-end;max-width:none}
.admin-form.inline input{padding:9px 12px}
.form-actions{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.admin-foot{text-align:center;color:var(--muted);padding:18px;font-size:13px}

/* 图片上传预览 */
.img-preview{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.img-preview .hint{color:var(--muted);font-size:12px}
.admin-form input[type=file]{padding:8px 0;font-size:13px}
.app-img{width:100%;max-width:280px;border-radius:8px;object-fit:cover;flex-shrink:0}

/* Responsive */
@media(max-width:900px){
  .card-grid,.app-grid,.feat-grid,.cert-grid,.admin-cards{grid-template-columns:repeat(2,1fr)}
  .product-detail,.about-cols,.contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .main-nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:12px 20px;gap:4px;border-bottom:1px solid var(--line)}
  .main-nav.open{display:flex}
  .menu-toggle{display:block}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid>div:nth-child(2){border-right:0}
  .card-grid,.app-grid,.feat-grid,.cert-grid,.admin-cards{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  .footer-grid{grid-template-columns:1fr}
  .section{padding:44px 0}
}