/* ============================================================
   0. 设计令牌 & 基础
   ============================================================ */

img{display:block;max-width:100%;height:auto;border:0;}
a{text-decoration:none;color:inherit;}
ul{margin:0;padding:0;list-style:none;}
h2,h4,p{margin:0;}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}

/* 统一容器宽度 */
.w1100{
  width:min(1100px, calc(100% - 2 * var(--gutter)));
  margin-inline:auto;
}

/* ============================================================
   1. 通用标题
   ============================================================ */
.section-header{
  text-align:center;
  margin-bottom:40px;
}
.section-title{
  font-size:clamp(24px, 3vw, 32px);
  font-weight:700;
  line-height:1.25;
  color:var(--c-dark);
  letter-spacing:-.02em;
}
.section-subtitle{
  position:relative;
  display:inline-block;
  margin-top:10px;
  font-size:clamp(14px, 1.6vw, 17px);
  font-weight:400;
  color:var(--c-muted);
}
.section-subtitle::after{
  content:"";
  display:block;
  width:48px;
  height:3px;
  margin:12px auto 0;
  border-radius:var(--pill);
  background:var(--c-primary);
}
.sect-head-wrap{padding-top:56px;}

/* ============================================================
   2. 按钮
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 34px;
  font:inherit;
  font-size:16px;
  font-weight:600;
  line-height:1;
  white-space:nowrap;
  color:#fff;
  background:var(--c-primary);
  border:0;
  border-radius:var(--pill);
  box-shadow:var(--sh-p);
  cursor:pointer;
  transition:transform .35s var(--ease), box-shadow .35s var(--ease), background-color .35s var(--ease);
}
.btn:hover{
  transform:translateY(-2px);
  background:var(--c-primary-lt);
  box-shadow:0 10px 30px rgba(74,142,255,.40);
}
.btn:active{
  transform:translateY(0);
  box-shadow:0 4px 14px rgba(74,142,255,.30);
}
.btn:focus-visible{
  outline:3px solid rgba(74,142,255,.45);
  outline-offset:3px;
}
.btn i{font-size:1.15em;line-height:1;}
.btn-outline{
  background:transparent;
  color:var(--c-primary);
  box-shadow:inset 0 0 0 2px var(--c-primary);
}
.btn-outline:hover{
  background:var(--c-primary);
  color:#fff;
  box-shadow:var(--sh-p);
}
.btn-white{
  background:#fff;
  color:var(--c-dark);
  box-shadow:0 4px 20px rgba(0,0,0,.10);
}
.btn-white:hover{
  background:#fff;
  box-shadow:0 10px 30px rgba(0,0,0,.18);
}

/* ============================================================
   3. 导航栏
   ============================================================ */
header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:1000;
  padding:0 var(--gutter);
  background:rgba(10,22,40,.85);
  backdrop-filter:blur(16px) saturate(180%);
  -webkit-backdrop-filter:blur(16px) saturate(180%);
  border-bottom:1px solid rgba(255,255,255,.06);
  transition:background-color .35s var(--ease), box-shadow .35s var(--ease);
}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
  header{background:rgba(10,22,40,.96);}
}
header.scrolled{
  background:rgba(10,22,40,.95);
  box-shadow:0 4px 30px rgba(0,0,0,.25);
}
header .w1100{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:var(--header-h);
}
header .logo{
  font-size:20px;
  font-weight:700;
  color:#fff;
  letter-spacing:-.02em;
}
header .logo span{color:var(--c-primary);}
header nav a{
  position:relative;
  margin-left:32px;
  font-size:14px;
  font-weight:500;
  color:rgba(255,255,255,.75);
  transition:color .2s ease;
}
header nav a::after{
  content:"";
  position:absolute;
  left:0;bottom:-6px;
  width:0;height:2px;
  border-radius:2px;
  background:var(--c-primary);
  transition:width .35s var(--ease);
}
header nav a:hover,
header nav a:focus-visible{color:#fff;}
header nav a:hover::after,
header nav a:focus-visible::after{width:100%;}
header nav a.active{color:#fff;}
header nav a.active::after{width:100%;}

/* ============================================================
   4. Banner
   ============================================================ */
.banner{
  position:relative;
  overflow:hidden;
  padding:calc(var(--header-h) + 44px) 0 60px;
  background:linear-gradient(135deg,#0a1628 0%,#1a3a6b 50%,#2a5298 100%);
  color:#fff;
}
.banner::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(circle at 80% 30%, rgba(74,142,255,.18) 0%, transparent 62%);
}
.banner .w1100{
  position:relative;
  z-index:2;
  display:flex;
  align-items:center;
  gap:48px;
}
.banner .topbanner{
  flex:1 1 60%;
  min-width:0;
}
.banner .topbanner p:first-of-type{
  font-size:clamp(28px, 4vw, 40px);
  font-weight:700;
  line-height:1.2;
  letter-spacing:-.02em;
}
.banner .topbanner p:nth-of-type(2){
  max-width:620px;
  margin-top:16px;
  font-size:clamp(15px, 1.6vw, 17px);
  line-height:1.85;
  color:rgba(255,255,255,.85);
}
.banner-cta{margin-top:30px;}
.banner .tr{
  flex:0 0 auto;
  text-align:right;
}
.banner .tr img{
  width:clamp(220px, 32vw, 380px);
  margin-left:auto;
  filter:drop-shadow(0 20px 40px rgba(0,0,0,.28));
  animation:float 6s ease-in-out infinite;
}
@keyframes float{
  0%,100%{transform:translateY(0);}
  50%{transform:translateY(-12px);}
}

/* ============================================================
   5. 技术优势
   ============================================================ */
.productfun{padding:56px 0;}
.productfun .section-header{margin-bottom:24px;}
.productfun .h1{
  max-width:820px;
  margin:0 auto 40px;
  text-align:center;
  font-size:clamp(16px, 1.7vw, 19px);
  line-height:1.75;
  color:var(--c-muted);
}
.productfun ul{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:24px;
  counter-reset:item;
}
.productfun ul li{
  position:relative;
  padding:28px 24px;
  background:var(--c-soft);
  border:1px solid transparent;
  border-radius:var(--radius);
  counter-increment:item;
  transition:transform .35s var(--ease), box-shadow .35s var(--ease),
             border-color .35s var(--ease), background-color .35s var(--ease);
}
.productfun ul li:hover{
  transform:translateY(-4px);
  background:#fff;
  border-color:var(--c-primary);
  box-shadow:var(--sh-2);
}
.productfun ul li p:first-of-type{
  position:relative;
  min-height:30px;
  padding-left:52px;
  font-size:18px;
  font-weight:600;
  line-height:1.35;
  color:var(--c-primary);
}
.productfun ul li p:first-of-type::before{
  content:counter(item, decimal-leading-zero);
  position:absolute;
  left:0;top:0;
  font-family:"Inter",sans-serif;
  font-size:30px;
  font-weight:700;
  line-height:1;
  color:rgba(74,142,255,.18);
}
.productfun ul li p:last-of-type{
  margin-top:10px;
  font-size:14px;
  line-height:1.85;
  color:var(--c-text);
}

/* ============================================================
   6. 电商软件（#bg4）
   ============================================================ */
#bg4{
  background:var(--c-blue);
  padding:56px 0;
}
#bg4 .flex{
  display:flex;
  align-items:center;
  gap:48px;
}
#bg4 .flex-1{flex:0 0 auto;}
#bg4 .flex-1 img{width:min(300px, 100%);}
#bg4 .flex-2{flex:1 1 0;min-width:0;}
#bg4 .pmain .title{
  margin-bottom:12px;
  font-size:clamp(20px, 2.2vw, 24px);
  font-weight:700;
  color:var(--c-dark);
}
#bg4 .pmain p{
  font-size:clamp(14px, 1.5vw, 16px);
  line-height:2;
  color:var(--c-text);
}
#bg4 .btn{margin-top:16px;}

/* ============================================================
   7. 客户案例（#bg3）
   ============================================================ */
#bg3{
  background:var(--c-soft);
  padding:56px 0;
}
#bg3 ul{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:24px;
}
#bg3 ul li{
  display:flex;
  flex-direction:column;
  background:#fff;
  border-radius:var(--radius);
  border-top:6px solid var(--c-primary);
  box-shadow:var(--sh-1);
  overflow:hidden;
  transition:transform .35s var(--ease), box-shadow .35s var(--ease);
}
#bg3 ul li:hover{
  transform:translateY(-4px);
  box-shadow:var(--sh-2);
}
#bg3 ul li .mytit{
  display:flex;
  align-items:center;
  padding:18px 20px 0;
  font-size:17px;
  font-weight:600;
  color:var(--c-dark);
}
#bg3 ul li .mytit img{
  width:36px;height:36px;
  margin-right:12px;
  padding:4px;
  border:1px solid var(--c-line);
  border-radius:50%;
  background:#fff;
  object-fit:contain;
  flex:0 0 auto;
}
#bg3 ul li .mycont{
  padding:12px 20px 22px;
}
#bg3 ul li .mycont p{
  margin-bottom:8px;
  font-weight:600;
  color:var(--c-primary);
}
#bg3 ul li .mycont .mydes{
  font-size:14px;
  line-height:1.8;
  color:var(--c-text);
}

/* 案例顶部色条 */
#bg3 ul li:nth-child(1){border-top-color:#4595ff;}
#bg3 ul li:nth-child(2){border-top-color:#32be72;}
#bg3 ul li:nth-child(3){border-top-color:#eb911e;}
#bg3 ul li:nth-child(4){border-top-color:#6c4cf1;}
#bg3 ul li:nth-child(5){border-top-color:#e74c3c;}
#bg3 ul li:nth-child(6){border-top-color:#20b2aa;}
#bg3 ul li:nth-child(7){border-top-color:#d4a017;}

/* ============================================================
   8. 自研框架（#bg2）
   ============================================================ */
#bg2{
  background:var(--c-blue);
  padding:56px 0;
}
#bg2 ul{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:30px;
}
#bg2 ul li{
  background:#fff;
  border-radius:var(--radius);
  box-shadow:var(--sh-1);
  text-align:center;
  overflow:hidden;
  transition:transform .35s var(--ease), box-shadow .35s var(--ease);
}
#bg2 ul li:hover{
  transform:translateY(-4px);
  box-shadow:var(--sh-2);
}
#bg2 ul li > div{padding:30px 24px;}
#bg2 ul li img{
  width:72px;height:72px;
  margin:0 auto 16px;
  object-fit:contain;
  transition:transform .4s var(--ease);
}
#bg2 ul li:hover img{transform:translateY(-3px) scale(1.06);}
#bg2 ul li p:first-of-type{
  font-size:18px;
  font-weight:600;
  color:var(--c-dark);
}
#bg2 ul li p:last-of-type{
  margin-top:10px;
  font-size:14px;
  line-height:1.8;
  color:var(--c-muted);
}

/* ============================================================
   9. 行业覆盖（fwjg）
   ============================================================ */
.fwjg{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:24px;
  padding:12px 0;
}
.fwjg li{
  position:relative;
  display:flex;
  flex-direction:column;
  justify-content:center;
  min-height:140px;
  padding:22px 24px;
  border-radius:var(--radius);
  color:#fff;
  overflow:hidden;
  transition:transform .35s var(--ease), box-shadow .35s var(--ease);
}
.fwjg li::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(120deg, rgba(255,255,255,.20), transparent 65%);
  opacity:0;
  transition:opacity .35s var(--ease);
}
.fwjg li:hover{
  transform:translateY(-3px) scale(1.015);
  box-shadow:var(--sh-2);
}
.fwjg li:hover::before{opacity:1;}
.fwjg li p:first-of-type{
  margin-bottom:6px;
  font-size:clamp(17px, 1.8vw, 20px);
  font-weight:600;
  line-height:1.3;
}
.fwjg li p:last-of-type{
  font-size:14px;
  line-height:1.5;
  opacity:.9;
}
.fwjg li i{
  position:absolute;
  right:12px;bottom:12px;
  width:80px;height:80px;
  background-position:center;
  background-repeat:no-repeat;
  background-size:contain;
  opacity:.22;
  pointer-events:none;
  transition:opacity .35s var(--ease), transform .35s var(--ease);
}
.fwjg li:hover i{
  opacity:.45;
  transform:scale(1.06) rotate(-3deg);
}

#fwjg1 li:nth-child(1){background:linear-gradient(135deg,#1962ec,#3d86ff);}
#fwjg1 li:nth-child(1) i{background-image:url('../../../images/pptbus/fwjg01.png');}
#fwjg1 li:nth-child(2){background:linear-gradient(135deg,#f08a24,#ffab4d);}
#fwjg1 li:nth-child(2) i{background-image:url('../../../images/pptbus/fwjg02.png');}
#fwjg1 li:nth-child(3){background:linear-gradient(135deg,#e23b3b,#ff6b6b);}
#fwjg1 li:nth-child(3) i{background-image:url('../../../images/pptbus/fwjg03.png');}
#fwjg1 li:nth-child(4){background:linear-gradient(135deg,#0eb894,#38d9b8);}
#fwjg1 li:nth-child(4) i{background-image:url('../../../images/pptbus/fwjg04.png');}

#fwjg2 li:nth-child(1){background:linear-gradient(135deg,#7b2ff7,#a259ff);}
#fwjg2 li:nth-child(1) i{background-image:url('../../../images/pptbus/fwjg05.png');}
#fwjg2 li:nth-child(2){background:linear-gradient(135deg,#0a9fd8,#37c6ff);}
#fwjg2 li:nth-child(2) i{background-image:url('../../../images/pptbus/fwjg06.png');}
#fwjg2 li:nth-child(3){background:linear-gradient(135deg,#ff5e3a,#ff8a65);}
#fwjg2 li:nth-child(3) i{background-image:url('../../../images/pptbus/fwjg07.png');}
#fwjg2 li:nth-child(4){background:linear-gradient(135deg,#0fa3a3,#33c9c9);}
#fwjg2 li:nth-child(4) i{background-image:url('../../../images/pptbus/fwjg08.png');}


/* ============================================================
   11. 响应式
   ============================================================ */
@media (max-width:1024px){
  :root{--gutter:20px;}

  .productfun ul,
  #bg3 ul,
  #bg2 ul{grid-template-columns:repeat(2, 1fr);}
  #bg2 ul{gap:24px;}
  .fwjg{grid-template-columns:repeat(2, 1fr);}

  footer .footertop{grid-template-columns:repeat(2, 1fr);gap:32px;}

  .banner .w1100{gap:32px;}
  .banner .tr img{width:min(300px, 30vw);}

  #bg4 .flex{gap:32px;}
}

@media (max-width:820px){
  .banner{
    padding:calc(var(--header-h) + 32px) 0 46px;
  }
  .banner .w1100{
    flex-direction:column;
    align-items:center;
    text-align:center;
  }
  .banner .topbanner{flex:1 1 auto;}
  .banner .topbanner p:nth-of-type(2){margin-inline:auto;}
  .banner .tr{text-align:center;}
  .banner .tr img{
    width:min(260px, 62vw);
    margin:0 auto;
  }

  #bg4 .flex{
    flex-direction:column;
    text-align:center;
  }
  #bg4 .flex-1 img{margin:0 auto;}

  .sect-head-wrap{padding-top:44px;}
}

@media (max-width:640px){
  .productfun ul,
  #bg3 ul,
  #bg2 ul,
  .fwjg{grid-template-columns:1fr;}

  .productfun,
  #bg2,
  #bg3,
  #bg4{padding:44px 0;}

  .section-header{margin-bottom:28px;}
  .productfun .h1{margin-bottom:28px;}

  footer{padding:44px 0 24px;}
  footer .footertop{grid-template-columns:1fr;gap:28px;}
  footer .footer-bottom{margin-top:28px;padding-top:22px;}
}