/* ==========================================================================
   PRSGROUP COMPANY LIMITED — 企业站样式
   纯手写 CSS，无外部依赖，任何静态托管都能跑
   ========================================================================== */

:root{
  --navy:#0d2f52;
  --blue:#1a5fa8;
  --blue-lt:#2b7fd4;
  --sky:#eef4fb;
  --accent:#e8590c;
  --green:#0f9d58;
  --txt:#1c2733;
  --dim:#5b6b7c;
  --line:#dde5ee;
  --bg:#ffffff;
  --bg-soft:#f6f9fc;
  --shadow:0 1px 3px rgba(13,47,82,.07),0 6px 20px rgba(13,47,82,.05);
  --radius:6px;
  --wrap:1180px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font:16px/1.7 -apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--txt);background:var(--bg);-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-lt)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* ---------------------------------- 顶栏 ---------------------------------- */
header{
  position:sticky;top:0;z-index:50;background:#fff;
  border-bottom:1px solid var(--line);
}
.topbar{
  background:var(--navy);color:#c8d8ea;font-size:13px;
}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;
  height:38px;flex-wrap:wrap;gap:8px}
.topbar a{color:#c8d8ea}
.topbar a:hover{color:#fff}
.topbar .t-right{display:flex;gap:18px}
nav.main{display:flex;align-items:center;justify-content:space-between;
  height:70px}
.logo{display:flex;align-items:center;gap:11px;font-weight:700;
  font-size:19px;color:var(--navy);letter-spacing:-.3px;white-space:nowrap}
.logo .mark{
  width:38px;height:38px;border-radius:5px;flex-shrink:0;
  background:linear-gradient(135deg,var(--blue) 0%,var(--navy) 100%);
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:17px;font-weight:800;
}
.logo small{display:block;font-size:10.5px;font-weight:500;color:var(--dim);
  letter-spacing:1.2px;text-transform:uppercase}
nav.main ul{display:flex;list-style:none;gap:4px;align-items:center}
nav.main ul a{
  display:block;padding:9px 14px;border-radius:4px;font-size:14.5px;
  font-weight:500;color:var(--txt);
}
nav.main ul a:hover{background:var(--sky);color:var(--blue)}
nav.main ul a.on{color:var(--blue);font-weight:600;background:var(--sky)}
.btn{
  display:inline-block;padding:11px 24px;border-radius:4px;font-size:14.5px;
  font-weight:600;cursor:pointer;border:none;transition:.15s;
  font-family:inherit;text-align:center;
}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--navy);color:#fff}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#c94a08;color:#fff}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.5)}
.btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff;border-color:#fff}
.btn-sm{padding:8px 16px;font-size:13.5px}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:4px;
  padding:7px 11px;font-size:18px;cursor:pointer;color:var(--navy)}

/* ---------------------------------- 英雄区 -------------------------------- */
.hero{
  background-image:linear-gradient(100deg,rgba(8,30,54,.92) 0%,rgba(13,47,82,.80) 38%,
                    rgba(18,62,108,.56) 100%),
    url('img/hero-pcb-1920.webp');
  background-position:center,center 42%;
  background-size:cover,cover;
  background-repeat:no-repeat,no-repeat;
  background-color:#0d2f52;
  color:#fff;padding:76px 0 82px;position:relative;overflow:hidden;
}
@media(max-width:1400px){
  .hero{background-image:linear-gradient(100deg,rgba(8,30,54,.92) 0%,rgba(13,47,82,.80) 38%,
                    rgba(18,62,108,.56) 100%),
    url('img/hero-pcb-1280.webp');
  background-position:center,center 42%;
  background-size:cover,cover;
  background-repeat:no-repeat,no-repeat;
  background-color:#0d2f52;}
}
@media(max-width:900px){
  .hero{background-image:linear-gradient(100deg,rgba(8,30,54,.92) 0%,rgba(13,47,82,.80) 38%,
                    rgba(18,62,108,.56) 100%),
    url('img/hero-pcb-900.webp');
  background-position:center,center 42%;
  background-size:cover,cover;
  background-repeat:no-repeat,no-repeat;
  background-color:#0d2f52;}
}

.hero::after{
  content:'';position:absolute;right:-120px;top:-120px;width:520px;height:520px;
  border-radius:50%;background:radial-gradient(circle,rgba(43,127,212,.36),transparent 68%);
}
.hero .wrap{position:relative;z-index:1}
.hero .tag{
  display:inline-block;background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.24);
  padding:5px 14px;border-radius:99px;font-size:12.5px;letter-spacing:.7px;
  text-transform:uppercase;margin-bottom:22px;
}
.hero h1{
  font-size:clamp(30px,4.4vw,48px);line-height:1.18;font-weight:700;
  letter-spacing:-1px;max-width:16em;margin-bottom:20px;
  text-shadow:0 2px 12px rgba(4,18,34,.65),0 1px 3px rgba(4,18,34,.5);
}
.hero p.lead{font-size:17.5px;color:#dceaf7;max-width:44em;margin-bottom:32px;
  text-shadow:0 1px 8px rgba(4,18,34,.7)}
.hero .btns{display:flex;gap:14px;flex-wrap:wrap}
.hero .facts{
  display:grid;grid-template-columns:repeat(4,1fr);gap:22px;
  margin-top:54px;padding-top:34px;border-top:1px solid rgba(255,255,255,.18);
}
.hero .facts div strong{display:block;font-size:26px;font-weight:700;letter-spacing:-.6px;\n  text-shadow:0 2px 10px rgba(4,18,34,.7)}
.hero .facts div span{font-size:13px;color:#c2d6ea;\n  text-shadow:0 1px 6px rgba(4,18,34,.85)}

/* ---------------------------------- 通用区块 ------------------------------ */
section{padding:74px 0}
section.soft{background:var(--bg-soft)}
section.tight{padding:52px 0}
.sec-head{max-width:660px;margin-bottom:46px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-head .kicker{
  font-size:12.5px;font-weight:700;color:var(--blue);letter-spacing:1.4px;
  text-transform:uppercase;margin-bottom:11px;
}
.sec-head h2{
  font-size:clamp(24px,2.9vw,33px);line-height:1.25;font-weight:700;
  letter-spacing:-.6px;color:var(--navy);margin-bottom:14px;
}
.sec-head p{color:var(--dim);font-size:16px}

.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 26px;box-shadow:var(--shadow);transition:.18s;
}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 28px rgba(13,47,82,.11);
  border-color:#c3d5e8}
.card .ico{
  width:46px;height:46px;border-radius:5px;background:var(--sky);
  display:flex;align-items:center;justify-content:center;font-size:22px;
  margin-bottom:17px;
}
.card h3{font-size:17.5px;font-weight:650;color:var(--navy);margin-bottom:9px}
.card p{color:var(--dim);font-size:14.5px;line-height:1.68}

ul.ticks{list-style:none;display:grid;gap:11px}
ul.ticks li{padding-left:27px;position:relative;color:var(--dim);font-size:15px}
ul.ticks li::before{
  content:'✓';position:absolute;left:0;top:0;color:var(--green);
  font-weight:700;font-size:15px;
}
ul.ticks li b{color:var(--txt);font-weight:600}

/* ---------------------------------- 表格 ---------------------------------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);
  background:#fff;box-shadow:var(--shadow)}
table.spec{width:100%;border-collapse:collapse;font-size:14.5px;min-width:560px}
table.spec th,table.spec td{padding:13px 20px;text-align:left;
  border-bottom:1px solid var(--line)}
table.spec th{background:var(--bg-soft);font-weight:650;color:var(--navy);
  font-size:13.5px;letter-spacing:.3px;white-space:nowrap}
table.spec tr:last-child td{border-bottom:none}
table.spec td:first-child{font-weight:600;color:var(--txt);width:34%}
table.spec td{color:var(--dim)}
table.spec tbody tr:hover{background:#fbfdff}

/* ---------------------------------- 联系/CTA ------------------------------ */
.cta{
  background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;
  padding:66px 0;text-align:center;
}
.cta h2{font-size:clamp(23px,2.8vw,32px);font-weight:700;letter-spacing:-.6px;
  margin-bottom:14px}
.cta p{color:#c8dcef;max-width:38em;margin:0 auto 30px;font-size:16.5px}
.cta .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ---------------------------------- 页脚 ---------------------------------- */
footer{background:#0a2540;color:#8fa8c0;font-size:14px;padding:58px 0 0}
footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1.3fr;gap:36px;
  padding-bottom:42px}
footer h4{color:#fff;font-size:14.5px;font-weight:650;margin-bottom:17px;
  letter-spacing:.3px}
footer a{color:#8fa8c0;display:block;padding:4px 0;font-size:14px}
footer a:hover{color:#fff}
footer .about p{line-height:1.75;margin-top:14px;font-size:13.8px}
footer .foot-logo{display:flex;align-items:center;gap:10px;color:#fff;
  font-weight:700;font-size:17px}
footer .foot-logo .mark{width:34px;height:34px;border-radius:4px;
  background:linear-gradient(135deg,var(--blue-lt),var(--blue));
  display:flex;align-items:center;justify-content:center;font-size:15px}
footer .bottom{
  border-top:1px solid rgba(255,255,255,.1);padding:20px 0;font-size:13px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
}

/* ---------------------------------- 页面头 -------------------------------- */
.page-head{
  background-image:linear-gradient(100deg,rgba(8,30,54,.93) 0%,rgba(13,47,82,.84) 50%,
                    rgba(18,62,108,.64) 100%),
    url('img/head-pcb-1600.webp');
  background-position:center,center 45%;
  background-size:cover,cover;
  background-repeat:no-repeat,no-repeat;
  background-color:#0d2f52;
  color:#fff;padding:54px 0 48px;
}
@media(max-width:1100px){
  .page-head{background-image:linear-gradient(100deg,rgba(8,30,54,.93) 0%,rgba(13,47,82,.84) 50%,
                    rgba(18,62,108,.64) 100%),
    url('img/head-pcb-1100.webp');
  background-position:center,center 45%;
  background-size:cover,cover;
  background-repeat:no-repeat,no-repeat;
  background-color:#0d2f52;}
}
@media(max-width:800px){
  .page-head{background-image:linear-gradient(100deg,rgba(8,30,54,.93) 0%,rgba(13,47,82,.84) 50%,
                    rgba(18,62,108,.64) 100%),
    url('img/head-pcb-800.webp');
  background-position:center,center 45%;
  background-size:cover,cover;
  background-repeat:no-repeat,no-repeat;
  background-color:#0d2f52;}
}

.page-head .crumb{font-size:13px;color:#c2d6ea;margin-bottom:12px;\n  text-shadow:0 1px 6px rgba(4,18,34,.8)}
.page-head .crumb a{color:#a9c3dd}
.page-head h1{font-size:clamp(26px,3.4vw,38px);font-weight:700;
  letter-spacing:-.8px;margin-bottom:12px;
  text-shadow:0 2px 10px rgba(4,18,34,.6)}
.page-head p{color:#dceaf7;max-width:46em;font-size:16px}

/* ---------------------------------- 联系卡片 ------------------------------ */
.contact-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:34px;align-items:start}
.info-list{display:grid;gap:0;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;background:#fff;box-shadow:var(--shadow)}
.info-list .row{display:flex;gap:16px;padding:19px 24px;
  border-bottom:1px solid var(--line)}
.info-list .row:last-child{border-bottom:none}
.info-list .ico{width:40px;height:40px;border-radius:5px;background:var(--sky);
  display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.info-list .k{font-size:12.5px;color:var(--dim);text-transform:uppercase;
  letter-spacing:.7px;font-weight:650}
.info-list .v{font-size:15.5px;color:var(--txt);margin-top:2px;word-break:break-word}
.info-list .v a{font-weight:600}

form.inq{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow)}
form.inq label{display:block;font-size:13px;font-weight:650;color:var(--navy);
  margin-bottom:6px;margin-top:16px}
form.inq label:first-of-type{margin-top:0}
form.inq input,form.inq textarea,form.inq select{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:4px;
  font:15px inherit;font-family:inherit;color:var(--txt);background:#fcfdff;
}
form.inq input:focus,form.inq textarea:focus,form.inq select:focus{
  outline:none;border-color:var(--blue-lt);background:#fff;
  box-shadow:0 0 0 3px rgba(43,127,212,.13);
}
form.inq textarea{min-height:110px;resize:vertical}
form.inq .note{font-size:12.5px;color:var(--dim);margin-top:14px;line-height:1.6}
form.inq button{width:100%;margin-top:20px}

/* ---------------------------------- 响 应 式 ------------------------------ */
@media(max-width:1000px){
  .g4{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:repeat(2,1fr)}
  footer .cols{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
  .hero .facts{grid-template-columns:repeat(2,1fr);gap:26px}
}
@media(max-width:760px){
  section{padding:52px 0}
  nav.main{height:auto;padding:14px 0;flex-wrap:wrap;gap:12px}
  .burger{display:block}
  nav.main ul{
    display:none;width:100%;flex-direction:column;align-items:stretch;
    gap:2px;padding-top:10px;border-top:1px solid var(--line);margin-top:6px;
  }
  nav.main ul.open{display:flex}
  nav.main ul a{padding:12px 14px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .hero{padding:52px 0 58px}
  .topbar .t-right{display:none}
  footer .cols{grid-template-columns:1fr}
}


/* ---------------------------------- 产品实拍 ---------------------------------- */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
@media(max-width:1000px){.gallery{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.gallery{grid-template-columns:1fr}}
.shot{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);transition:.18s;
}
.shot:hover{transform:translateY(-5px);box-shadow:0 14px 36px rgba(13,47,82,.16);
  border-color:#b8cfe8}
.shot img{width:100%;aspect-ratio:1/1;object-fit:contain;display:block;
  padding:14px;transition:transform .32s cubic-bezier(.2,.7,.3,1),
  filter .32s ease;
  filter:drop-shadow(0 10px 16px rgba(13,47,82,.16))
         drop-shadow(0 2px 4px rgba(13,47,82,.10))}
.shot:hover img{transform:scale(1.06);
  filter:drop-shadow(0 18px 26px rgba(13,47,82,.24))
         drop-shadow(0 3px 6px rgba(13,47,82,.14))}
.shot .cap{padding:13px 15px;font-size:13px;color:var(--dim);
  border-top:1px solid var(--line)}
.shot .cap b{display:block;color:var(--navy);font-size:14px;
  font-weight:650;margin-bottom:3px}
.shot-wide{grid-column:span 2}
@media(max-width:560px){.shot-wide{grid-column:span 1}}


/* ---------------------------------- 交期区块 ---------------------------------- */
.speed{background:linear-gradient(180deg,#0d2f52 0%,#123f6b 100%);color:#fff;
  padding:74px 0}
.speed .sec-head h2{color:#fff}
.speed .sec-head p{color:#a9c3dd}
.speed .kicker{color:#7fb3e8}
.speed-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;
  margin-top:44px}
@media(max-width:1000px){.speed-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.speed-grid{grid-template-columns:1fr}}
.speed-card{
  background:#fff;border-radius:8px;padding:20px 18px 22px;text-align:center;
  box-shadow:0 10px 30px rgba(0,0,0,.25);transition:.2s;
}
.speed-card:hover{transform:translateY(-5px);box-shadow:0 16px 40px rgba(0,0,0,.34)}
.speed-stack{background:#f4f8fc;border:1px solid #e3ecf5;border-radius:6px;
  padding:10px 8px;margin-bottom:16px}
.speed-layers{font-size:14px;font-weight:700;color:#0d2f52;letter-spacing:.3px}
.speed-time{font-size:40px;font-weight:800;letter-spacing:-1.6px;color:#e8590c;
  line-height:1.05;margin:8px 0 2px}
.speed-time span{font-size:13px;font-weight:600;color:#5b6b7c;letter-spacing:0;
  margin-left:5px}
.speed-note{font-size:12px;color:#8a97a5}


/* ---------------------------------- 技术插画 ---------------------------------- */
.illus{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;box-shadow:var(--shadow);margin-top:20px}
.illus .cap{font-size:12.5px;color:var(--dim);margin-top:12px;text-align:center}
.finishes{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:22px}
@media(max-width:760px){.finishes{grid-template-columns:1fr}}