/* ============================================================
   龙鼎鸿图（北京）科技有限公司 官网样式
   风格：简约 · 时尚 · 浅色
   ============================================================ */
:root{
  --c-primary:#4F46E5;
  --c-primary-2:#7C3AED;
  --c-accent:#F59E0B;
  --grad:linear-gradient(135deg,#4F46E5 0%,#7C3AED 100%);
  --c-ink:#0F172A;
  --c-body:#475569;
  --c-muted:#94A3B8;
  --c-line:#E6EAF3;
  --c-bg:#FFFFFF;
  --c-bg-alt:#F6F8FC;
  --c-dark:#0B1020;
  --radius:16px;
  --shadow-card:0 1px 3px rgba(15,23,42,.05),0 8px 24px rgba(15,23,42,.04);
  --shadow-hover:0 6px 12px rgba(79,70,229,.08),0 20px 44px rgba(79,70,229,.14);
  --maxw:1200px;
  --header-h:74px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 14px)}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;
  color:var(--c-ink);background:var(--c-bg);line-height:1.7;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section-alt{background:var(--c-bg-alt)}

/* ---------- 通用元素 ---------- */
.section-eyebrow{
  font-size:13px;font-weight:700;letter-spacing:4px;color:var(--c-primary);
  text-transform:uppercase;margin-bottom:10px;
}
.section-eyebrow.light{color:#C7D2FE}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px;flex-wrap:wrap}
.section-head.center{flex-direction:column;align-items:center;text-align:center}
.section-head h2{font-size:clamp(26px,3vw,34px);font-weight:800;letter-spacing:-.01em}
.h2-mark{color:var(--c-muted);font-weight:600}
.section-sub{color:var(--c-body);margin-top:10px;max-width:560px}
.section-head.center .section-sub{max-width:640px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 28px;border-radius:999px;font-size:15px;font-weight:600;
  transition:transform .25s,box-shadow .25s,background .25s,border-color .25s;white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 20px rgba(79,70,229,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(79,70,229,.36)}
.btn-ghost{background:#fff;color:var(--c-ink);border:1.5px solid var(--c-line)}
.btn-ghost:hover{border-color:var(--c-primary);color:var(--c-primary);transform:translateY(-2px)}
.btn-sm{padding:9px 20px;font-size:14px}
.btn-light{background:#fff;color:var(--c-primary);box-shadow:0 8px 20px rgba(0,0,0,.18)}
.btn-light:hover{transform:translateY(-2px)}
.nav-cta{margin-left:8px}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;height:var(--header-h);
  display:flex;align-items:center;background:rgba(255,255,255,.82);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:box-shadow .3s,border-color .3s;
}
.site-header.scrolled{border-color:var(--c-line);box-shadow:0 4px 24px rgba(15,23,42,.06)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;width:100%}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{width:42px;height:42px;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:20px;font-weight:800;letter-spacing:1px}
.brand-text small{font-size:11px;color:var(--c-muted);letter-spacing:.4px}
.nav{display:flex;align-items:center;gap:6px}
.nav-link{
  position:relative;padding:8px 14px;font-size:15px;color:var(--c-body);border-radius:10px;
  transition:color .2s,background .2s;
}
.nav-link:hover{color:var(--c-primary);background:rgba(79,70,229,.06)}
.nav-link.active{color:var(--c-primary);font-weight:600}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--c-ink);border-radius:2px;transition:.3s}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{position:relative;padding:calc(var(--header-h) + 72px) 0 72px;overflow:hidden;background:var(--c-bg)}
.hero-deco{position:absolute;inset:0;pointer-events:none}
.hero-deco svg{width:100%;height:100%;opacity:.7}
.hero-inner{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.pill{
  display:inline-flex;align-items:center;gap:8px;padding:7px 16px;border-radius:999px;
  background:rgba(79,70,229,.07);border:1px solid rgba(79,70,229,.16);
  color:var(--c-primary);font-size:13.5px;font-weight:600;letter-spacing:.3px;margin-bottom:22px;
}
.pill .dot{width:7px;height:7px;border-radius:50%;background:var(--c-accent);box-shadow:0 0 0 4px rgba(245,158,11,.18)}
.hero h1{font-size:clamp(34px,4.6vw,54px);line-height:1.18;font-weight:800;letter-spacing:-.02em}
.hero h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{color:var(--c-body);font-size:16.5px;margin:20px 0 30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:0;margin-top:44px;flex-wrap:wrap}
.stat{flex:1;min-width:110px;padding:0 20px;border-left:1px solid var(--c-line)}
.stat:first-child{border-left:0;padding-left:0}
.stat strong{display:block;font-size:26px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1.2}
.stat span{font-size:13px;color:var(--c-muted)}

.hero-visual{position:relative;min-height:420px}
.glow{position:absolute;border-radius:50%;filter:blur(60px);opacity:.55}
.glow-1{width:340px;height:340px;background:rgba(124,58,237,.22);top:10px;right:20px}
.glow-2{width:260px;height:260px;background:rgba(79,70,229,.20);bottom:0;left:0}
.hv-main{position:relative;height:100%}
.hv-img{border-radius:18px;box-shadow:0 24px 60px rgba(15,23,42,.18);border:6px solid #fff}
.hv-img-main{width:78%;transform:rotate(-4deg);position:relative;z-index:2}
.hv-img-mini{position:absolute;width:38%;bottom:6px;left:-14px;z-index:3;transform:rotate(5deg)}
.hv-img-ai{position:absolute;width:34%;top:8px;right:-6px;z-index:1;transform:rotate(6deg);opacity:.92}
.hv-chip{
  position:absolute;top:58%;right:8%;z-index:4;background:#0F172A;color:#fff;
  padding:10px 14px;border-radius:14px;font-size:15px;font-weight:700;text-align:center;line-height:1.3;
  box-shadow:0 14px 30px rgba(15,23,42,.28);
}
.hv-chip small{color:#A5B4FC;font-weight:500;font-size:12px}
.hv-tag{
  position:absolute;top:-10px;left:24%;z-index:4;background:#fff;color:var(--c-primary);
  font-size:12.5px;font-weight:700;padding:6px 14px;border-radius:999px;
  box-shadow:0 10px 24px rgba(79,70,229,.2);border:1px solid rgba(79,70,229,.2);
}

/* ---------- 产品筛选 ---------- */
.tabs{display:flex;gap:10px;flex-wrap:wrap}
.tab{
  padding:9px 20px;border-radius:999px;border:1.5px solid var(--c-line);background:#fff;
  font-size:14px;font-weight:600;color:var(--c-body);cursor:pointer;transition:.25s;
}
.tab:hover{border-color:var(--c-primary);color:var(--c-primary)}
.tab.active{background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 6px 16px rgba(79,70,229,.3)}

/* ---------- 产品卡片 ---------- */
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(264px,1fr));gap:26px}
.card{
  background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-card);transition:transform .3s,box-shadow .3s,border-color .3s;
  display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:rgba(79,70,229,.25)}
.card-media{position:relative;aspect-ratio:3/2;background:linear-gradient(160deg,#F8FAFD,#EBF0F8);overflow:hidden}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .45s}
.card:hover .card-media img{transform:scale(1.05)}
.card-tag{
  position:absolute;top:12px;left:12px;z-index:2;font-size:12px;font-weight:700;
  padding:4px 12px;border-radius:999px;color:#fff;background:var(--grad);box-shadow:0 4px 12px rgba(15,23,42,.18);
}
.card-cat{
  position:absolute;top:12px;right:12px;z-index:2;font-size:12px;font-weight:600;
  padding:4px 12px;border-radius:999px;background:rgba(255,255,255,.92);backdrop-filter:blur(4px);
  border:1px solid var(--c-line);color:var(--c-body);
}
.card-body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:17px;font-weight:700}
.card-spec{font-size:13.5px;color:var(--c-body);margin:6px 0 14px;line-height:1.6}
.card-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between}
.card-price{font-size:18px;font-weight:800;color:var(--c-primary)}
.card-price small{font-size:12px;font-weight:600;color:var(--c-muted)}
.card-link{
  font-size:13.5px;font-weight:600;color:var(--c-primary);padding:8px 16px;border-radius:999px;
  border:1.5px solid rgba(79,70,229,.3);transition:.25s;
}
.card-link:hover{background:var(--grad);border-color:transparent;color:#fff}
.grid-note{margin-top:28px;font-size:12.5px;color:var(--c-muted);text-align:center}

/* 分类角标配色 */
.cat-chip{display:inline-block;font-size:12px;font-weight:600;padding:3px 10px;border-radius:8px;margin-right:8px}
.c-arm{background:rgba(79,70,229,.1);color:#4338CA}
.c-ai{background:rgba(6,182,212,.12);color:#0E7490}
.c-fpga{background:rgba(245,158,11,.14);color:#B45309}
.c-router{background:rgba(16,185,129,.12);color:#047857}

/* ---------- 定制区 ---------- */
.custom-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.custom-copy h3{font-size:24px;font-weight:800;margin-bottom:14px}
.custom-copy>p{color:var(--c-body);margin-bottom:26px}
.feature-list{display:grid;grid-template-columns:1fr 1fr;gap:18px 24px}
.feature-list li{display:flex;gap:12px;align-items:flex-start}
.f-icon{
  flex:none;width:36px;height:36px;border-radius:12px;background:rgba(79,70,229,.08);
  color:var(--c-primary);display:flex;align-items:center;justify-content:center;margin-top:2px;
}
.f-icon svg{width:16px;height:16px}
.feature-list strong{display:block;font-size:14.5px}
.feature-list small{color:var(--c-muted);font-size:12.5px}
.custom-actions{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}

.custom-collage{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.cc-item{
  background:#fff;border:1px solid var(--c-line);border-radius:14px;overflow:hidden;
  box-shadow:var(--shadow-card);transition:transform .3s,box-shadow .3s;
}
.cc-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.cc-item img{width:100%;aspect-ratio:16/10;object-fit:cover}
.cc-item figcaption{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;font-size:13.5px}
.c-badge{font-size:11.5px;font-weight:700;color:var(--c-primary);background:rgba(79,70,229,.08);padding:3px 10px;border-radius:999px}
.cc-2{transform:translateY(14px)}
.cc-4{transform:translateY(14px)}

/* ---------- 定制流程 ---------- */
.process{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:64px}
.process-step{
  position:relative;background:#fff;border:1px solid var(--c-line);border-radius:14px;
  padding:24px;box-shadow:var(--shadow-card);
}
.process-step .p-num{
  display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:12px;
  background:var(--grad);color:#fff;font-size:16px;font-weight:800;margin-bottom:14px;
  box-shadow:0 8px 18px rgba(79,70,229,.3);
}
.process-step h4{font-size:16px;margin-bottom:6px}
.process-step p{font-size:13px;color:var(--c-muted)}

/* ---------- CTA 横幅 ---------- */
.cta-band{
  margin-top:56px;border-radius:24px;padding:40px 48px;color:#fff;
  background:linear-gradient(120deg,#312E81 0%,#4F46E5 55%,#7C3AED 100%);
  display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;
  box-shadow:0 24px 60px rgba(79,70,229,.32);
}
.cta-band h3{font-size:22px;font-weight:800;margin-bottom:6px}
.cta-band p{color:rgba(255,255,255,.82);font-size:14.5px}

/* ---------- 关于我们 ---------- */
.about-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.about-card{
  background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:34px 30px;
  box-shadow:var(--shadow-card);transition:transform .3s,box-shadow .3s;
}
.about-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.a-icon{
  width:54px;height:54px;border-radius:16px;display:flex;align-items:center;justify-content:center;margin-bottom:18px;
}
.a-icon svg{width:26px;height:26px}
.a-1{background:rgba(79,70,229,.1);color:var(--c-primary)}
.a-2{background:rgba(245,158,11,.14);color:#B45309}
.a-3{background:rgba(6,182,212,.12);color:#0E7490}
.about-card h3{font-size:18px;margin-bottom:8px}
.about-card p{font-size:14px;color:var(--c-body)}

/* ---------- 联系我们 ---------- */
.section-contact{
  background:linear-gradient(160deg,#11182E 0%,#1B2450 100%);color:#fff;text-align:center;padding:88px 0;
}
.section-contact h2{font-size:34px;font-weight:800;margin-bottom:12px}
.section-contact p{color:rgba(255,255,255,.75);margin-bottom:30px}
.contact-mail{
  display:inline-block;font-size:clamp(20px,3vw,28px);font-weight:800;letter-spacing:.5px;
  color:#C7D2FE;border-bottom:2px solid rgba(199,210,254,.4);padding-bottom:6px;transition:.25s;
}
.contact-mail:hover{color:#fff;border-color:#fff}
.contact-meta{display:flex;gap:28px;justify-content:center;flex-wrap:wrap;margin-top:34px;color:rgba(255,255,255,.6);font-size:13.5px}

/* ---------- 底部版权区 ---------- */
.site-footer{background:var(--c-dark);color:#94A3B8}
.footer-top{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding:64px 24px 44px;
}
.f-brand .brand{margin-bottom:16px}
.f-brand .brand-text strong{color:#fff}
.f-brand p{font-size:13.5px;line-height:1.8;max-width:300px}
.f-col h5{color:#fff;font-size:15px;font-weight:700;margin-bottom:16px}
.f-col a{display:block;font-size:13.5px;padding:5px 0;transition:color .2s}
.f-col a:hover{color:#fff}
.f-col span{display:block;font-size:13.5px;padding:5px 0}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:1px solid rgba(255,255,255,.08);padding:20px 24px;font-size:13px;
}
.footer-bottom .icp{color:#C7D2FE;transition:color .2s}
.footer-bottom .icp:hover{color:#fff}

/* ---------- 返回顶部 ---------- */
.back-top{
  position:fixed;right:26px;bottom:26px;z-index:90;width:46px;height:46px;border-radius:14px;
  background:var(--grad);color:#fff;border:0;cursor:pointer;box-shadow:0 10px 26px rgba(79,70,229,.35);
  display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transform:translateY(12px);
  transition:.3s;
}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top svg{width:17px;height:17px}
.back-top:hover{transform:translateY(-3px)}

/* ---------- 滚动显现动画 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .hero-inner{grid-template-columns:1fr;gap:48px}
  .hero-visual{min-height:340px;max-width:520px;margin:0 auto}
  .custom-grid{grid-template-columns:1fr;gap:44px}
  .process{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
  .nav{
    position:fixed;top:var(--header-h);left:0;right:0;background:#fff;flex-direction:column;
    align-items:stretch;padding:18px 24px 26px;gap:4px;border-bottom:1px solid var(--c-line);
    box-shadow:0 20px 40px rgba(15,23,42,.08);
    transform:translateY(-12px);opacity:0;visibility:hidden;transition:.28s;
  }
  .nav.open{transform:none;opacity:1;visibility:visible}
  .nav-link{padding:12px 8px;font-size:16px}
  .nav-cta{margin:10px 0 0}
  .nav-toggle{display:flex}
}
@media (max-width:768px){
  .section{padding:72px 0}
  .about-grid{grid-template-columns:1fr}
  .product-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px}
  .section-head{flex-direction:column;align-items:flex-start}
  .hero h1{font-size:34px}
  .hide-sm{display:none}
  .hero-stats{margin-top:32px}
  .stat{padding:0 12px}
  .stat strong{font-size:21px}
  .cta-band{padding:30px 26px}
  .feature-list{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr;gap:28px;padding:48px 24px 32px}
  .footer-bottom{justify-content:center;text-align:center}
}