:root{
  --navy:#0a2138;
  --navy-2:#0f3055;
  --blue:#1a6fb0;
  --accent:#e2711d;
  --ink:#151d28;
  --ink-2:#5a6a7d;
  --line:#e2e8ef;
  --bg:#fff;
  --bg-soft:#f4f7fa;
  --radius:4px;
  --wrap:1280px;
  --gutter:clamp(16px, 4vw, 40px);
  --sec-pad:clamp(64px, 9vw, 124px);
  --header-h:76px;
  --shadow-s:0 1px 2px rgba(10,33,56,.05), 0 6px 18px rgba(10,33,56,.06);
  --shadow-l:0 18px 50px rgba(10,33,56,.16);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;font-size:16px;line-height:1.75;color:var(--ink);background:var(--bg);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
h1,h2,h3,p,dl,dd,dt,ul,figure{margin:0}
ul{padding:0;list-style:none}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
section[id]{scroll-margin-top:calc(var(--header-h) + 8px)}

/* ================= 滚动渐显 ================= */
/* 只有在 html.js 存在时才先隐藏，保证禁用 JS 时内容依然完整可见 */
html.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
html.js .reveal.is-in{opacity:1;transform:none}

/* ================= 页头 ================= */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  --hd-fg:#fff; --hd-fg-dim:rgba(255,255,255,.72);
  transition:background .3s,box-shadow .3s,border-color .3s;
  border-bottom:1px solid transparent;
}
.site-header.is-solid{
  --hd-fg:var(--navy); --hd-fg-dim:var(--ink-2);
  background:rgba(255,255,255,.96);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom-color:var(--line);
  box-shadow:0 1px 12px rgba(10,33,56,.06);
}
.bar{
  max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter);
  height:var(--header-h);display:flex;align-items:center;gap:clamp(14px,2.4vw,34px);
}
.logo{display:flex;align-items:center;gap:11px;flex:0 0 auto}
.logo-mark{
  width:38px;height:38px;border-radius:var(--radius);
  background:var(--accent);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:19px;font-weight:700;flex:0 0 auto;
}
.logo-text{display:flex;flex-direction:column;line-height:1.16}
.logo-text strong{font-size:18px;letter-spacing:1.5px;color:var(--hd-fg);transition:color .3s}
.logo-text em{font-size:9px;font-style:normal;letter-spacing:1.6px;color:var(--hd-fg-dim);transition:color .3s}

.nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav a{
  padding:9px 14px;border-radius:var(--radius);font-size:15px;
  color:var(--hd-fg);white-space:nowrap;transition:color .2s,background .2s;
}
.nav a:hover{color:var(--accent)}
.nav a.is-active{color:var(--accent);font-weight:600}

.tel-top{
  flex:0 0 auto;font-size:15px;font-weight:700;letter-spacing:.5px;color:var(--hd-fg);
  padding:9px 18px;border:1px solid currentColor;border-radius:var(--radius);white-space:nowrap;
  transition:color .2s,border-color .2s,background .2s;
}
.tel-top:hover{color:var(--accent);border-color:var(--accent)}

.burger{display:none;width:44px;height:44px;margin-left:auto;background:none;border:0;
  cursor:pointer;padding:12px 10px;flex-direction:column;justify-content:space-between}
.burger span{display:block;height:2px;background:var(--hd-fg);border-radius:2px;transition:transform .22s,opacity .22s,background .3s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(9px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-9px) rotate(-45deg)}

/* ================= 首屏 ================= */
.hero{
  position:relative;isolation:isolate;
  min-height:clamp(560px, 92vh, 900px);
  display:flex;flex-direction:column;justify-content:flex-end;
  padding-top:var(--header-h);
  color:#fff;overflow:hidden;
}
.hero-media,.hero-media img{position:absolute;inset:0;width:100%;height:100%;z-index:-2}
.hero-media img{object-fit:cover;object-position:center 62%}
.hero-scrim{
  position:absolute;inset:0;z-index:-1;
  background:
    linear-gradient(90deg,rgba(6,20,34,.94) 0%,rgba(6,20,34,.78) 42%,rgba(6,20,34,.34) 78%,rgba(6,20,34,.22) 100%),
    linear-gradient(0deg,rgba(6,20,34,.82) 0%,transparent 46%);
}
.hero-inner{
  max-width:var(--wrap);margin:0 auto;width:100%;
  padding:clamp(48px,7vw,96px) var(--gutter) clamp(36px,4vw,56px);
}
.eyebrow{
  font-size:clamp(11px,1.3vw,13px);letter-spacing:3.5px;color:#7fc4f2;
  margin-bottom:clamp(14px,2vw,22px);font-weight:600;
}
.hero h1{
  font-size:clamp(30px,5.4vw,62px);line-height:1.2;font-weight:800;
  letter-spacing:1px;max-width:21em;text-shadow:0 2px 24px rgba(0,0,0,.35);
}
.hero h1 .hl{color:#ffb265}
.lead{
  margin-top:clamp(16px,2.2vw,26px);
  font-size:clamp(15px,1.5vw,19px);line-height:1.85;color:#d3e2f0;max-width:44em;
}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:clamp(26px,3.6vw,44px)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:15px 34px;border-radius:var(--radius);
  font-size:15px;font-weight:700;letter-spacing:1px;
  transition:transform .16s,background .16s,border-color .16s,color .16s;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 10px 26px rgba(226,113,29,.32)}
.btn-primary:hover{background:#c9631a}
.btn-ghost{border:1px solid rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.1)}

.hero-stats{background:rgba(6,20,34,.62);backdrop-filter:blur(8px);border-top:1px solid rgba(255,255,255,.14)}
.hero-stats .wrap-in{
  max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter);
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
}
.hero-stats>div>div{padding:clamp(18px,2.4vw,28px) 0}
.hero-stats dt{font-size:12px;letter-spacing:2px;color:#7fa3c4}
.hero-stats dd{font-size:clamp(14px,1.4vw,17px);font-weight:600;margin-top:6px}

/* ================= 通用区块 ================= */
.section{padding:var(--sec-pad) 0}
.section.alt{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.crumb{font-size:13px;color:var(--ink-2);margin-bottom:clamp(14px,2vw,22px)}
.crumb a:hover{color:var(--blue)}
.crumb span{margin:0 8px;color:#b9c4d0}
.sec-head{max-width:52em;margin-bottom:clamp(34px,4.4vw,60px)}
.sec-title{
  font-size:clamp(26px,4vw,42px);font-weight:800;color:var(--navy);
  letter-spacing:1px;line-height:1.25;
}
.sec-title::after{content:"";display:block;width:56px;height:4px;background:var(--accent);margin-top:16px;border-radius:2px}
.sec-sub{margin-top:clamp(16px,2vw,24px);font-size:clamp(15px,1.4vw,18px);color:var(--ink-2);line-height:1.9}

/* ================= 行业卡片 ================= */
.grid{display:grid;gap:clamp(14px,1.6vw,24px);grid-template-columns:repeat(4,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(22px,2.2vw,32px) clamp(20px,2vw,28px);
  box-shadow:var(--shadow-s);position:relative;overflow:hidden;
  transition:transform .26s,box-shadow .26s,border-color .26s;
}
.card::before{
  content:"";position:absolute;left:0;top:0;width:100%;height:3px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .3s;
}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-l);border-color:#cfdcea}
.card:hover::before{transform:scaleX(1)}
.ico{width:46px;height:46px;color:var(--blue);margin-bottom:16px}
.ico svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:clamp(16px,1.4vw,19px);color:var(--navy);margin-bottom:10px;letter-spacing:.5px}
.card p{font-size:14.5px;line-height:1.85;color:var(--ink-2)}

.brand-note{
  margin-top:clamp(24px,3vw,38px);padding:18px 22px;
  background:var(--bg-soft);border-left:3px solid var(--accent);border-radius:0 var(--radius) var(--radius) 0;
  font-size:15px;color:var(--ink-2);line-height:1.85;
}
.brand-note b{color:var(--navy);font-weight:700;letter-spacing:.5px}

/* ================= 图示带 ================= */
.strip{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--line)}
.strip-item{position:relative;background:var(--navy);overflow:hidden;aspect-ratio:4/3}
.strip-item img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease,opacity .5s}
.strip-item:hover img{transform:scale(1.05)}
.strip-cap{
  position:absolute;left:0;right:0;bottom:0;padding:22px 20px 18px;color:#fff;
  background:linear-gradient(0deg,rgba(6,20,34,.92),transparent);
  display:flex;flex-direction:column;gap:2px;
}
.strip-cap b{font-size:16px;letter-spacing:1px}
.strip-cap span{font-size:13px;color:#b9cfe3}

/* ================= 图文分栏 ================= */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,4.5vw,72px);align-items:center}
.split.reverse .split-media{order:2}
.split-media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-l)}
.split-media img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/11}
.split-text .sec-sub{margin-top:18px}
.split-text p{margin-top:16px;color:var(--ink-2)}

.list{margin-top:clamp(22px,2.6vw,34px);display:grid;gap:2px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.list li{background:#fff;padding:20px 24px;font-size:15px;color:var(--ink-2);line-height:1.85}
.list li b{display:block;color:var(--navy);font-size:16px;margin-bottom:4px;letter-spacing:.5px}

.about-figs{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:clamp(24px,3vw,36px)}
.fig{background:#fff;border-left:3px solid var(--accent);padding:14px 16px;border-radius:0 var(--radius) var(--radius) 0;box-shadow:var(--shadow-s)}
.fig b{display:block;color:var(--navy);font-size:15px}
.fig span{font-size:13px;color:var(--ink-2)}

/* ================= 服务流程 ================= */
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(14px,1.6vw,24px)}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:clamp(24px,2.4vw,34px);box-shadow:var(--shadow-s);transition:transform .26s,box-shadow .26s}
.step:hover{transform:translateY(-5px);box-shadow:var(--shadow-l)}
.step i{display:block;font-style:normal;font-size:clamp(28px,3vw,40px);font-weight:800;color:#d7e2ee;letter-spacing:1px;line-height:1}
.step h3{font-size:17px;color:var(--navy);margin:12px 0 8px}
.step p{font-size:14.5px;color:var(--ink-2);line-height:1.8}

/* ================= 联系我们 ================= */
.contact-box{display:grid;grid-template-columns:1.15fr 1fr 1.3fr;gap:clamp(14px,1.6vw,22px);margin-top:clamp(28px,3.4vw,44px)}
.c-item{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(22px,2.4vw,32px)}
.c-item.c-lead{background:var(--navy);border-color:var(--navy);color:#fff}
.c-label{display:block;font-size:12px;letter-spacing:2.5px;color:var(--ink-2)}
.c-lead .c-label{color:#7fa3c4}
.c-value{display:block;margin-top:10px;font-size:17px;font-weight:700;color:var(--navy);line-height:1.6}
.c-lead .c-value{color:#fff}
.c-value.big{font-size:clamp(26px,3.2vw,38px);letter-spacing:1px}
.c-value.big:hover{color:#ffb265}
.c-value.addr{font-size:15px;font-weight:500;line-height:1.7;color:var(--ink)}
.c-note{display:block;margin-top:8px;font-size:13px;color:#8fb0cd}

/* ================= 地址与导航 ================= */
.addr-list{margin-top:clamp(18px,2.2vw,26px);display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.addr-list li{background:#fff;padding:15px 20px;display:grid;grid-template-columns:56px 1fr;gap:14px;align-items:baseline}
.addr-list li > span{font-size:13px;letter-spacing:2px;color:var(--ink-2)}
.addr-list li b{font-size:15.5px;color:var(--navy);font-weight:600;line-height:1.65}
.addr-list li b a:hover{color:var(--accent)}

.map-links{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.btn-sm{padding:11px 22px;font-size:14px}
.btn-ghost.dark{color:var(--navy);border-color:var(--line);background:#fff}
.btn-ghost.dark:hover{border-color:var(--accent);color:var(--accent);background:var(--bg-soft)}
.map-hint{margin-top:14px;font-size:13px;color:var(--ink-2);line-height:1.7}

.map-frame{
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:var(--bg-soft);box-shadow:var(--shadow-s);
  aspect-ratio:16/11;min-height:320px;
}
.map-frame iframe{width:100%;height:100%;border:0;display:block}

.c-value.mail{font-size:clamp(16px,1.8vw,21px);word-break:break-all}
.c-value.mail:hover{color:var(--accent)}

/* ================= 页脚 ================= */
.site-footer{background:var(--navy);color:#9fb6cb;padding:clamp(40px,5vw,64px) 0 0}
.foot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:28px;padding-bottom:34px}
.foot-brand{display:flex;flex-direction:column;gap:7px;max-width:34em}
.foot-brand strong{font-size:clamp(17px,1.8vw,21px);color:#fff;letter-spacing:1px}
.foot-brand span{font-size:13px}
.foot-addr{color:#7d97ae}
.foot-nav{display:flex;flex-wrap:wrap;gap:4px;align-self:center}
.foot-nav a{padding:8px 14px;font-size:14px;border-radius:var(--radius)}
.foot-nav a:hover{background:rgba(255,255,255,.09);color:#fff}
.copy{border-top:1px solid rgba(255,255,255,.11);padding:20px 0;font-size:13px}
.copy .wrap{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center}
.copy a:hover{color:#fff;text-decoration:underline}
.ai-note{width:100%;font-size:12px;color:#7d97ae;line-height:1.7}

/* ================= 响应式 ================= */
/* 主导航 8 项 + logo + 电话按钮约需 1044px，因此在 1080px 就折叠成抽屉，
   避免 860–1044px 区间（笔记本与中小桌面）横向挤压。
   布局类的移动端调整仍留在 860px，不让平板提前变成手机版。 */
@media (max-width:1080px){
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .contact-box{grid-template-columns:1fr 1fr}
  .burger{display:flex}
  .tel-top{display:none}
  .nav{
    position:fixed;left:0;right:0;top:var(--header-h);margin:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:#fff;border-bottom:1px solid var(--line);
    padding:8px var(--gutter) 18px;max-height:calc(100dvh - var(--header-h));overflow-y:auto;
    transform:translateY(-120%);visibility:hidden;pointer-events:none;
    transition:transform .28s ease,visibility 0s linear .28s;
    box-shadow:0 18px 34px rgba(10,33,56,.16);
  }
  .nav.is-open{transform:translateY(0);visibility:visible;pointer-events:auto;transition:transform .28s ease,visibility 0s}
  .nav a{padding:15px 8px;font-size:16px;color:var(--ink);border-bottom:1px solid var(--line);border-radius:0}
  .nav a:last-child{border-bottom:0}
  .nav a.is-active{background:none}
}

@media (max-width:860px){
  :root{--header-h:64px}
  .hero{min-height:clamp(520px,86vh,720px)}
  .hero-media img{object-position:68% 62%}
  .hero-stats .wrap-in{grid-template-columns:repeat(2,1fr);gap:0}
  .hero-stats>div>div{padding:16px 0;border-top:1px solid rgba(255,255,255,.09)}
  .hero-stats>div>div:nth-child(2){border-top:0}
  .hero-stats>div>div:nth-child(1){border-top:0}

  .strip{grid-template-columns:1fr}
  .strip-item{aspect-ratio:16/9}
  .split{grid-template-columns:1fr;gap:28px}
  .split.reverse .split-media{order:0}
  .split-media img{aspect-ratio:16/10}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .about-figs{grid-template-columns:1fr}
  .contact-box{grid-template-columns:1fr}
  .foot{flex-direction:column;gap:20px}
  .copy .wrap{flex-direction:column;align-items:flex-start;gap:8px}
}

@media (max-width:480px){
  .grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .hero-cta{flex-direction:column;align-items:stretch}
  .btn{padding:16px 22px}
  .logo-text em{display:none}
  .sec-sub br{display:none}
}

@media print{
  /* 打印与导出 PDF 时不能有任何隐藏内容 */
  html.js .reveal{opacity:1!important;transform:none!important}
  .site-header{position:static}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important}
  html.js .reveal{opacity:1;transform:none}
}