/* 北京信得技术服务有限责任公司 —— 官网样式（蓝色商务风） */
:root{
  --blue:#2563EB; --blue-d:#1D4ED8; --blue-l:#60A5FA; --blue-xl:#EFF6FF;
  --ink:#0F172A; --ink-2:#1E3A5F; --gray:#64748B; --gray-l:#94A3B8;
  --bg:#FFFFFF; --bg-2:#F8FAFC; --bg-3:#F1F5F9; --line:#E2E8F0;
  --green:#16A34A; --radius:14px; --shadow:0 4px 24px rgba(15,23,42,.07);
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
h1,h2,h3,h4{line-height:1.35;font-weight:700}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:10px;font-weight:600;font-size:15px;transition:.25s;border:1.5px solid transparent;cursor:pointer;white-space:nowrap}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d);transform:translateY(-2px);box-shadow:0 8px 20px rgba(37,99,235,.28)}
.btn-outline{border-color:rgba(255,255,255,.55);color:#fff}
.btn-outline:hover{background:#fff;color:var(--blue)}
.btn-ghost{border-color:var(--blue);color:var(--blue)}
.btn-ghost:hover{background:var(--blue);color:#fff}

/* ============ 导航 ============ */
.navbar{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.9);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:.3s}
.navbar.scrolled{border-bottom-color:var(--line);box-shadow:0 2px 16px rgba(15,23,42,.06)}
.nav-container{max-width:var(--maxw);margin:0 auto;padding:0 24px;height:72px;display:flex;align-items:center;justify-content:space-between}
.nav-logo{display:flex;align-items:center;gap:11px;font-size:20px;font-weight:800;color:var(--ink);letter-spacing:.5px}
.nav-logo .logo-text b{color:var(--blue)}
.nav-menu{display:flex;align-items:center;gap:30px}
.nav-link{font-size:15px;color:var(--ink-2);font-weight:500;position:relative;padding:6px 0;transition:.2s}
.nav-link:hover,.nav-link.active{color:var(--blue)}
.nav-link.active::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--blue);border-radius:2px}
.nav-toggle{display:none;width:42px;height:42px;align-items:center;justify-content:center;background:none;border:none;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);position:relative;transition:.3s}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:22px;height:2px;background:var(--ink);transition:.3s}
.nav-toggle span::before{top:-7px}.nav-toggle span::after{top:7px}

/* ============ 首屏 ============ */
.hero{margin-top:72px;padding:110px 0 90px;background:linear-gradient(135deg,#0F172A 0%,#16305C 45%,#1D4ED8 100%);color:#fff;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(96,165,250,.28),transparent 65%);top:-180px;right:-120px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center;position:relative}
.hero-tag{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;background:rgba(96,165,250,.18);border:1px solid rgba(147,197,253,.35);border-radius:999px;font-size:13.5px;color:#BFDBFE;margin-bottom:24px}
.hero h1{font-size:50px;letter-spacing:1px;margin-bottom:20px}
.hero h1 em{font-style:normal;color:var(--blue-l)}
.hero .sub{font-size:18px;color:#CBD5E1;margin-bottom:34px;max-width:560px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:44px}
.hero-stats{display:flex;gap:44px;flex-wrap:wrap}
.hero-stats b{display:block;font-size:32px;color:#fff;line-height:1.2}
.hero-stats span{font-size:14px;color:#94A3B8}
.hero-card{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:20px;padding:28px;backdrop-filter:blur(8px)}
.hero-card h4{font-size:16px;margin-bottom:18px;color:#BFDBFE}
.hero-card ul li{display:flex;align-items:flex-start;gap:12px;padding:12px 0;border-bottom:1px dashed rgba(255,255,255,.14);font-size:14.5px;color:#E2E8F0}
.hero-card ul li:last-child{border-bottom:none}
.hero-card ul li i{flex:none;width:20px;height:20px;margin-top:3px;color:var(--blue-l)}

/* ============ 通用区块 ============ */
section{padding:96px 0}
.section-head{text-align:center;max-width:720px;margin:0 auto 56px}
.section-head .tag{display:inline-block;font-size:14px;font-weight:700;color:var(--blue);background:var(--blue-xl);padding:6px 16px;border-radius:999px;margin-bottom:16px;letter-spacing:1px}
.section-head h2{font-size:36px;margin-bottom:16px}
.section-head p{color:var(--gray);font-size:16.5px}
.alt{background:var(--bg-2)}
.alt2{background:var(--bg-3)}

/* ============ 关于我们 ============ */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.about-txt p{color:var(--gray);margin-bottom:18px;font-size:16px}
.about-txt h2{font-size:34px;margin-bottom:20px}
.about-list{margin-top:26px;display:grid;gap:14px}
.about-list li{display:flex;gap:12px;align-items:flex-start;font-size:15.5px}
.about-list li i{flex:none;width:22px;height:22px;color:var(--blue);margin-top:3px}
.about-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.acard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;box-shadow:var(--shadow);transition:.3s}
.acard:hover{transform:translateY(-6px);border-color:var(--blue)}
.acard i{width:34px;height:34px;color:var(--blue);margin-bottom:14px}
.acard h4{font-size:17px;margin-bottom:8px}
.acard p{font-size:14px;color:var(--gray)}

/* ============ 优势 ============ */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.adv{background:#fff;border-radius:var(--radius);padding:34px 26px;border:1px solid var(--line);transition:.3s;position:relative;overflow:hidden}
.adv:hover{box-shadow:var(--shadow);border-color:var(--blue-l);transform:translateY(-5px)}
.adv .ico{width:54px;height:54px;border-radius:14px;background:var(--blue-xl);display:flex;align-items:center;justify-content:center;margin-bottom:20px}
.adv .ico i{width:26px;height:26px;color:var(--blue)}
.adv h4{font-size:18px;margin-bottom:10px}
.adv p{font-size:14.5px;color:var(--gray)}
.adv .num{position:absolute;right:18px;top:14px;font-size:44px;font-weight:800;color:var(--bg-3)}

/* ============ 业务 ============ */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.svc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;display:flex;flex-direction:column}
.svc:hover{box-shadow:var(--shadow);transform:translateY(-6px);border-color:var(--blue-l)}
.svc-top{padding:32px 26px 0}
.svc-top i{width:38px;height:38px;color:var(--blue);margin-bottom:16px}
.svc h3{font-size:19px;margin-bottom:10px}
.svc p{font-size:14.5px;color:var(--gray);padding-bottom:16px}
.svc-tags{display:flex;flex-wrap:wrap;gap:8px;padding:0 26px 26px}
.svc-tags span{font-size:12.5px;color:var(--ink-2);background:var(--bg-3);padding:5px 11px;border-radius:6px}
.svc-link{margin-top:auto;padding:14px 26px;border-top:1px solid var(--line);font-size:14px;color:var(--blue);font-weight:600;display:flex;align-items:center;gap:6px}
.svc-link:hover{background:var(--blue-xl)}

/* ============ 流程 ============ */
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:0;margin-top:8px}
.flow-item{text-align:center;position:relative;padding:0 12px}
.flow-item:not(:last-child)::after{content:"";position:absolute;top:26px;right:-6px;width:44%;height:2px;background:linear-gradient(90deg,var(--blue-l),transparent)}
.flow-item .dot{width:52px;height:52px;margin:0 auto 16px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;box-shadow:0 6px 18px rgba(37,99,235,.25)}
.flow-item h4{font-size:16px;margin-bottom:6px}
.flow-item p{font-size:13.5px;color:var(--gray)}

/* ============ 客户 ============ */
.clients{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.client{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 20px;text-align:center;transition:.3s}
.client:hover{border-color:var(--blue-l);box-shadow:var(--shadow)}
.client .ico{width:44px;height:44px;margin:0 auto 14px;color:var(--blue)}
.client h4{font-size:16px;margin-bottom:6px}
.client p{font-size:13.5px;color:var(--gray)}

/* ============ 新闻 ============ */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.news{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s}
.news:hover{box-shadow:var(--shadow);transform:translateY(-5px)}
.news-img{height:150px;background:linear-gradient(135deg,var(--blue-xl),#DBEAFE);display:flex;align-items:center;justify-content:center;overflow:hidden}
.news-img i{width:42px;height:42px;color:var(--blue);opacity:.55}
.news-img img{width:100%;height:100%;object-fit:cover;display:block}
.news-body{padding:22px}
.news-body .date{font-size:13px;color:var(--gray-l);margin-bottom:8px}
.news-body h3{font-size:17px;margin-bottom:10px;line-height:1.5}
.news-body p{font-size:14px;color:var(--gray);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ============ 联系 ============ */
.contact{background:linear-gradient(135deg,#0F172A,#16305C);color:#fff}
.contact .section-head h2,.contact .section-head{color:#fff}
.contact .section-head p{color:#94A3B8}
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:start}
.ct-info{display:grid;gap:22px}
.ct-item{display:flex;gap:16px;align-items:flex-start}
.ct-item .ico{flex:none;width:46px;height:46px;border-radius:12px;background:rgba(96,165,250,.16);display:flex;align-items:center;justify-content:center}
.ct-item .ico i{width:22px;height:22px;color:var(--blue-l)}
.ct-item b{display:block;font-size:15.5px;margin-bottom:2px}
.ct-item span{font-size:14px;color:#CBD5E1}
.form{background:#fff;border-radius:18px;padding:30px;color:var(--ink)}
.form h3{font-size:20px;margin-bottom:4px}
.form .tips{font-size:13.5px;color:var(--gray);margin-bottom:22px}
.f-row{margin-bottom:16px}
.f-row label{display:block;font-size:14px;font-weight:600;margin-bottom:7px;color:var(--ink-2)}
.f-row label i{color:#E11D48;font-style:normal;margin-right:3px}
.f-row input,.f-row select,.f-row textarea{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:12px 14px;font-size:15px;font-family:inherit;color:var(--ink);transition:.2s;background:#fff}
.f-row textarea{min-height:96px;resize:vertical}
.f-row input:focus,.f-row select:focus,.f-row textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.f-2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form .btn-primary{width:100%;justify-content:center;margin-top:6px}
.f-row.bad input,.f-row.bad select,.f-row.bad textarea{border-color:#E11D48;background:#FFF5F5}
.form-msg{display:none;margin-top:14px;padding:14px 16px;border-radius:10px;font-size:14.5px;line-height:1.6}
.form-msg.ok{display:block;background:#F0FDF4;border:1px solid #BBF7D0;color:#166534}
.form-msg.err{display:block;background:#FEF2F2;border:1px solid #FECACA;color:#991B1B}

/* ============ 页脚 ============ */
footer{background:#0B1220;color:#94A3B8;padding:56px 0 26px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:34px;border-bottom:1px solid rgba(255,255,255,.1)}
.foot-brand .logo{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;color:#fff;margin-bottom:14px}
.foot-brand p{font-size:14px;line-height:1.8;margin-bottom:14px}
.foot-col h4{color:#fff;font-size:15px;margin-bottom:16px}
.foot-col li{margin-bottom:10px}
.foot-col a:hover{color:var(--blue-l)}
.foot-bottom{padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px}
.foot-bottom a{color:#64748B}

/* ============ 新闻页 ============ */
.page-head{margin-top:72px;padding:70px 0 50px;background:linear-gradient(135deg,#0F172A,#1D4ED8);color:#fff;text-align:center}
.page-head h1{font-size:38px;margin-bottom:12px}
.page-head p{color:#CBD5E1}
.news-list{display:grid;gap:20px;max-width:900px;margin:0 auto}
.news-item{display:grid;grid-template-columns:130px 1fr;gap:24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.3s}
.news-item:hover{box-shadow:var(--shadow);border-color:var(--blue-l)}
.news-date{text-align:center;border-right:1px solid var(--line);padding-right:20px}
.news-date b{display:block;font-size:28px;color:var(--blue);line-height:1.1}
.news-date span{font-size:13px;color:var(--gray-l)}
.news-item h3{font-size:19px;margin-bottom:8px}
.news-item p{font-size:14.5px;color:var(--gray)}
.news-item.has-img{grid-template-columns:130px 1fr 170px;align-items:center}
.news-item .thumb-lg{width:170px;height:108px;object-fit:cover;border-radius:10px;border:1px solid var(--line)}
.news-more{margin-top:10px;font-size:14px;color:var(--gray);line-height:1.8;white-space:pre-wrap}

/* ============ 后台登录 ============ */
.login-page{max-width:380px;margin:90px auto;padding:0 24px}
.login-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow)}
.login-card h2{font-size:22px;margin-bottom:6px}
.login-card p.sub{font-size:14px;color:var(--gray);margin-bottom:24px}

/* ============ 响应式 ============ */
@media(max-width:1024px){
  .hero-grid,.about-grid,.contact-grid{grid-template-columns:1fr;gap:40px}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .svc-grid,.news-grid{grid-template-columns:repeat(2,1fr)}
  .clients{grid-template-columns:repeat(2,1fr)}
  .flow{grid-template-columns:repeat(3,1fr);gap:24px}
  .flow-item:not(:last-child)::after{display:none}
  .foot-grid{grid-template-columns:1fr 1fr;gap:30px}
}
@media(max-width:768px){
  .nav-toggle{display:flex}
  .nav-menu{position:fixed;top:72px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:12px 24px 24px;gap:0;border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(15,23,42,.1);transform:translateY(-12px);opacity:0;visibility:hidden;transition:.25s}
  .nav-menu.open{transform:none;opacity:1;visibility:visible}
  .nav-menu li{border-bottom:1px solid var(--bg-3)}
  .nav-menu li:last-child{border:none}
  .nav-link{display:block;padding:14px 0}
  .hero{padding:70px 0 60px}
  .hero h1{font-size:32px}
  .hero .sub{font-size:16px}
  .hero-stats{gap:26px}
  .hero-stats b{font-size:26px}
  section{padding:64px 0}
  .section-head h2{font-size:27px}
  .adv-grid,.svc-grid,.news-grid,.clients,.about-cards,.f-2{grid-template-columns:1fr}
  .flow{grid-template-columns:repeat(2,1fr);gap:20px}
  .news-item,.news-item.has-img{grid-template-columns:1fr;gap:12px}
  .news-item .thumb-lg{width:100%;height:180px}
  .news-date{text-align:left;border-right:none;border-bottom:1px solid var(--line);padding:0 0 10px}
  .foot-grid{grid-template-columns:1fr}
  .btn{padding:12px 20px;font-size:14.5px}
}
.hidden{display:none!important}