/* ========== 基础重置与变量 ========== */
:root{
  --navy:#0B2A4E;
  --navy-2:#123A66;
  --blue:#1565D8;
  --blue-d:#0E4FA8;
  --blue-l:#E8F1FD;
  --ink:#1B2733;
  --ink-2:#33475E;
  --muted:#5A6E86;
  --muted-2:#7A8CA3;
  --line:#E2EAF3;
  --line-2:#EEF3F9;
  --soft:#F5F8FC;
  --white:#FFFFFF;
  --amber:#B8730F;
  --green:#2F7A4C;
  --red:#B03A3A;
  --radius:10px;
  --shadow:0 1px 2px rgba(16,42,67,.04), 0 8px 24px rgba(16,42,67,.05);
  --shadow-lg:0 2px 6px rgba(16,42,67,.06), 0 18px 48px rgba(16,42,67,.10);
  --max:1200px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth; -webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans CN",sans-serif;
  color:var(--ink);
  background:var(--white);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.35;letter-spacing:.01em;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}

.wrap{max-width:var(--max);margin:0 auto;padding:0 24px;}

/* ========== 顶部导航 ========== */
.hdr{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.hdr-in{display:flex;align-items:center;gap:32px;height:66px;}
.brand{display:flex;align-items:center;gap:11px;flex-shrink:0;}
.brand-mark{
  width:30px;height:30px;border-radius:7px;
  background:linear-gradient(135deg,var(--blue),var(--navy));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:14px;font-weight:700;letter-spacing:-.5px;
}
.brand-txt{font-size:16.5px;font-weight:700;color:var(--navy);letter-spacing:.02em;white-space:nowrap;}
.nav{display:flex;align-items:center;gap:2px;margin-left:auto;}
.nav a{
  padding:8px 13px;border-radius:7px;font-size:14.5px;color:var(--ink-2);
  transition:background .18s,color .18s;white-space:nowrap;
}
.nav a:hover{background:var(--soft);color:var(--blue);}
.nav a.on{color:var(--blue);font-weight:600;background:var(--blue-l);}
.hdr-cta{
  margin-left:14px;padding:9px 18px;border-radius:7px;background:var(--blue);color:#fff;
  font-size:14.5px;font-weight:600;white-space:nowrap;transition:background .18s;
}
.hdr-cta:hover{background:var(--blue-d);}
.burger{display:none;margin-left:auto;width:40px;height:40px;border:1px solid var(--line);
  background:#fff;border-radius:8px;cursor:pointer;position:relative;}
.burger span{position:absolute;left:11px;width:18px;height:2px;background:var(--ink-2);transition:.2s;}
.burger span:nth-child(1){top:14px;}
.burger span:nth-child(2){top:19px;}
.burger span:nth-child(3){top:24px;}
.burger.act span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.burger.act span:nth-child(2){opacity:0;}
.burger.act span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* ========== Hero ========== */
.hero{position:relative;background:var(--navy);color:#fff;overflow:hidden;}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.95;}
.hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(6,20,38,.94) 0%,rgba(8,28,52,.80) 46%,rgba(10,36,66,.42) 100%);
}
.hero-in{position:relative;z-index:2;padding:104px 0 92px;max-width:760px;}
.tagline{
  display:inline-flex;align-items:center;gap:9px;
  padding:6px 14px 6px 10px;border-radius:999px;
  border:1px solid rgba(140,190,255,.32);background:rgba(21,101,216,.16);
  font-size:13.5px;color:#BBD9FF;letter-spacing:.03em;margin-bottom:26px;
}
.tagline i{width:6px;height:6px;border-radius:50%;background:#4DA3FF;display:block;}
.hero h1{font-size:47px;line-height:1.22;letter-spacing:.01em;margin-bottom:20px;}
.hero .sub{font-size:19px;color:#CFE2FB;font-weight:500;margin-bottom:18px;line-height:1.6;}
.hero .desc{font-size:16px;color:#A9C4E4;line-height:1.95;max-width:660px;}
.hero-btns{display:flex;gap:14px;margin-top:36px;flex-wrap:wrap;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:13px 28px;border-radius:8px;font-size:15px;font-weight:600;transition:.2s;
}
.btn-p{background:var(--blue);color:#fff;}
.btn-p:hover{background:#0F56BE;transform:translateY(-1px);}
.btn-g{border:1px solid rgba(160,200,255,.4);color:#DCE9FB;}
.btn-g:hover{background:rgba(255,255,255,.08);}

.hero-stats{
  position:relative;z-index:2;border-top:1px solid rgba(255,255,255,.13);
  display:grid;grid-template-columns:repeat(4,1fr);
}
.hero-stats div{padding:26px 0 30px;border-right:1px solid rgba(255,255,255,.10);}
.hero-stats div:last-child{border-right:none;}
.hero-stats b{display:block;font-size:32px;font-weight:700;color:#fff;line-height:1.2;}
.hero-stats span{display:block;font-size:13.5px;color:#9FBEE6;margin-top:6px;letter-spacing:.04em;}

/* ========== 通用区块 ========== */
.sec{padding:96px 0;}
.sec-soft{background:var(--soft);border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2);}
.sec-head{max-width:820px;margin-bottom:52px;}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;font-size:13px;font-weight:700;
  color:var(--blue);letter-spacing:.14em;margin-bottom:16px;text-transform:uppercase;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--blue);display:block;}
.sec-head h2{font-size:33px;color:var(--navy);margin-bottom:16px;letter-spacing:.01em;}
.sec-head p{font-size:16.5px;color:var(--muted);line-height:1.9;}
.lead{font-size:16.5px;color:var(--ink-2);line-height:1.95;}

/* ========== 概述三卡片 ========== */
.tri{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.tri-c{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:32px 30px 30px;transition:.22s;position:relative;overflow:hidden;
}
.tri-c::before{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:var(--blue);transform:scaleX(0);transform-origin:left;transition:transform .3s;}
.tri-c:hover{box-shadow:var(--shadow-lg);border-color:#CFE0F5;}
.tri-c:hover::before{transform:scaleX(1);}
.tri-n{font-size:13px;font-weight:700;color:var(--blue);letter-spacing:.1em;margin-bottom:14px;}
.tri-c h3{font-size:20px;color:var(--navy);margin-bottom:12px;}
.tri-c p{font-size:15px;color:var(--muted);line-height:1.9;}

/* ========== 难点对照 ========== */
.pain{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.pain-i{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 28px;display:flex;gap:18px;align-items:flex-start;
}
.pain-n{
  flex-shrink:0;width:30px;height:30px;border-radius:8px;background:var(--blue-l);
  color:var(--blue);font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:center;
}
.pain-b{flex:1;}
.pain-b h4{font-size:16.5px;color:var(--ink);margin-bottom:8px;}
.pain-b p{font-size:14.8px;color:var(--muted);line-height:1.85;}
.pain-b .ans{
  margin-top:12px;padding-top:12px;border-top:1px dashed var(--line);
  font-size:14.8px;color:var(--ink-2);line-height:1.85;position:relative;padding-left:20px;
}
.pain-b .ans::before{content:"";position:absolute;left:0;top:21px;width:9px;height:9px;border-radius:2px;background:var(--green);opacity:.85;}
.pain-b .ans b{color:var(--green);font-weight:600;margin-right:6px;}

/* ========== 图 ========== */
.fig{margin-top:44px;}
.fig-box{
  background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:22px;box-shadow:var(--shadow);
}
.fig-box img{width:100%;height:auto;border-radius:6px;}
.fig-cap{
  margin-top:14px;font-size:13.5px;color:var(--muted-2);text-align:center;line-height:1.7;
}

/* ========== 功能模块 ========== */
.mod{padding:88px 0;border-top:1px solid var(--line-2);}
.mod:first-of-type{border-top:none;}
.mod-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:56px;align-items:start;}
.mod-intro h3{font-size:28px;color:var(--navy);margin-bottom:6px;}
.mod-id{font-size:13px;font-weight:700;color:var(--blue);letter-spacing:.12em;margin-bottom:14px;}
.mod-intro .lead{margin-top:16px;}
.mod-meta{margin-top:26px;display:flex;flex-wrap:wrap;gap:10px;}
.chip{
  padding:6px 14px;border-radius:999px;background:var(--soft);border:1px solid var(--line);
  font-size:13.5px;color:var(--ink-2);
}
.feat{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;}
.feat-i{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 24px 22px;
  transition:.22s;
}
.feat-i:hover{border-color:#C9DDF8;box-shadow:var(--shadow);}
.feat-i .ic{
  width:38px;height:38px;border-radius:9px;background:var(--blue-l);
  display:flex;align-items:center;justify-content:center;margin-bottom:15px;
}
.feat-i .ic svg{width:20px;height:20px;stroke:var(--blue);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.feat-i h4{font-size:17px;color:var(--navy);margin-bottom:10px;}
.feat-i p{font-size:14.6px;color:var(--muted);line-height:1.85;}
.feat.wide{grid-template-columns:repeat(2,1fr);}
.feat-i.wide{grid-column:1 / -1;}
.feat-i.wide p{max-width:none;}

/* ========== 技术特性 ========== */
.tech{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.tech-i{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 28px;transition:.22s;
}
.tech-i:hover{box-shadow:var(--shadow);border-color:#CFE0F5;}
.tech-i h4{font-size:17.5px;color:var(--navy);margin-bottom:12px;padding-left:16px;position:relative;}
.tech-i h4::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--blue);}
.tech-i p{font-size:14.8px;color:var(--muted);line-height:1.9;}

/* ========== 场景 ========== */
.scene{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.scene-i{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.22s;
}
.scene-i:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px);}
.scene-h{height:5px;background:linear-gradient(90deg,var(--blue),var(--navy-2));}
.scene-b{padding:26px 24px 28px;}
.scene-b h4{font-size:17.5px;color:var(--navy);margin-bottom:12px;}
.scene-b p{font-size:14.6px;color:var(--muted);line-height:1.85;}
.scene-b ul{margin-top:16px;border-top:1px dashed var(--line);padding-top:14px;}
.scene-b li{font-size:14px;color:var(--ink-2);line-height:1.8;padding-left:16px;position:relative;margin-bottom:6px;}
.scene-b li::before{content:"";position:absolute;left:0;top:11px;width:5px;height:5px;border-radius:1px;background:var(--blue);transform:rotate(45deg);}

/* ========== 实施流程 ========== */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;margin-top:8px;}
.step{position:relative;padding:0 22px;}
.step:not(:last-child)::after{
  content:"";position:absolute;right:0;top:16px;width:100%;height:1px;
  background:repeating-linear-gradient(90deg,var(--line) 0 6px,transparent 6px 12px);
}
.step-n{
  width:34px;height:34px;border-radius:50%;background:#fff;border:2px solid var(--blue);
  color:var(--blue);font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:center;
  position:relative;z-index:2;margin-bottom:16px;
}
.step h4{font-size:16.5px;color:var(--navy);margin-bottom:8px;}
.step p{font-size:14.2px;color:var(--muted);line-height:1.8;}

/* ========== 联系 ========== */
.cta{
  background:linear-gradient(120deg,var(--navy) 0%,var(--navy-2) 62%,#154C86 100%);
  color:#fff;padding:78px 0;
}
.cta-in{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center;}
.cta h2{font-size:30px;margin-bottom:14px;line-height:1.4;}
.cta p{font-size:16px;color:#B9D1EF;line-height:1.9;}
.cta-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;}
.cta-c{
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius);padding:20px 22px;
}
.cta-c span{display:block;font-size:12.5px;color:#93B5DF;letter-spacing:.08em;margin-bottom:7px;}
.cta-c b{display:block;font-size:17px;font-weight:600;color:#fff;line-height:1.55;word-break:break-all;}
.cta-c a:hover{text-decoration:underline;}

/* ========== 页脚 ========== */
.ftr{background:#071B33;color:#8FA6C2;padding:54px 0 34px;font-size:14px;}
.ftr-top{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:34px;border-bottom:1px solid rgba(255,255,255,.09);}
.ftr-brand{display:flex;align-items:center;gap:11px;margin-bottom:16px;}
.ftr-brand .brand-mark{background:linear-gradient(135deg,#2A7BFF,var(--navy));}
.ftr-brand span{font-size:16px;font-weight:700;color:#fff;}
.ftr p{font-size:13.8px;line-height:1.9;color:#7E96B4;max-width:420px;}
.ftr h5{font-size:14.5px;color:#D7E5F6;margin:0 0 16px;font-weight:600;letter-spacing:.04em;}
.ftr li{margin-bottom:10px;}
.ftr li a{font-size:13.8px;color:#7E96B4;transition:color .18s;}
.ftr li a:hover{color:#BDD6F5;}
.ftr-bot{padding-top:24px;display:flex;flex-wrap:wrap;gap:12px 26px;align-items:center;font-size:13px;color:#6E86A4;}
.ftr-bot .icp{margin-left:auto;}

/* ========== 通用动画钩子（默认全部可见） ========== */
.rv{opacity:1;transform:none;}

/* ========== 响应式 ========== */
@media (max-width:1080px){
  .hero h1{font-size:40px;}
  .mod-grid{grid-template-columns:1fr;gap:36px;}
  .scene{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(3,1fr);gap:28px 0;}
  .step:nth-child(3)::after{display:none;}
  .cta-in{grid-template-columns:1fr;gap:36px;}
}
@media (max-width:860px){
  .nav{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;
    padding:10px 16px 18px;gap:2px;box-shadow:0 12px 24px rgba(16,42,67,.08);}
  .nav.open{display:flex;}
  .nav a{padding:12px 10px;font-size:15.5px;}
  .hdr-cta{display:none;}
  .burger{display:block;}
  .hdr-in{height:66px;}
  .hero-in{padding:76px 0 62px;}
  .hero h1{font-size:33px;}
  .hero .sub{font-size:17px;}
  .hero-stats{grid-template-columns:repeat(2,1fr);}
  .hero-stats div{padding:20px 0 22px;}
  .hero-stats div:nth-child(2){border-right:none;}
  .hero-stats b{font-size:26px;}
  .sec{padding:66px 0;}
  .sec-head h2{font-size:26px;}
  .tri,.pain,.feat,.tech{grid-template-columns:1fr;}
  .cta-cards{grid-template-columns:1fr;}
  .ftr-top{grid-template-columns:1fr;gap:30px;}
  .ftr-bot .icp{margin-left:0;}
}
@media (max-width:560px){
  .scene{grid-template-columns:1fr;}
  .steps{grid-template-columns:repeat(2,1fr);}
  .hero h1{font-size:28px;}
  .fig-box{padding:12px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;}
  html{scroll-behavior:auto;}
}