/* 河北羽川科技有限公司 · 工程技术服务官网（浅色编辑风） */
:root{
  --bg:#f8f6f1;
  --paper:#fffdf9;
  --ink:#16211f;
  --muted:#5d6b67;
  --accent:#0e7a6b;
  --accent-soft:#e2efe9;
  --gold:#b08d4f;
  --line:#ded9cc;
  --dark:#0f2420;
  --max:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",system-ui,sans-serif;
  line-height:1.8;font-size:16px;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.wrap{width:min(var(--max),calc(100% - 56px));margin:0 auto}
.serif{font-family:"Noto Serif SC","Songti SC",Georgia,"Times New Roman",serif}
h1,h2,h3{margin:0;font-weight:600;line-height:1.3;letter-spacing:-.01em}
h1{font-size:clamp(36px,5.2vw,62px)}
h2{font-size:clamp(26px,3.2vw,36px)}
h3{font-size:19px}
p{margin:0;color:var(--muted)}
.lead{font-size:17.5px;color:#41504b;max-width:600px}

/* 顶栏 */
.top{
  position:sticky;top:0;z-index:50;background:rgba(248,246,241,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
}
.top-in{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:baseline;gap:12px}
.brand .cn{font-size:19px;font-weight:700;letter-spacing:.04em}
.brand .en{font-size:11px;letter-spacing:.28em;color:var(--muted);text-transform:uppercase}
.nav-links{display:flex;gap:30px;align-items:center}
.nav-links a{font-size:14.5px;color:#41504b;padding:6px 0;border-bottom:1px solid transparent;transition:.2s}
.nav-links a:hover{color:var(--accent)}
.nav-links a.on{color:var(--accent);border-bottom-color:var(--accent)}
.top-cta{font-size:14px;padding:10px 20px;border:1px solid var(--ink);border-radius:2px;transition:.2s}
.top-cta:hover{background:var(--ink);color:#fff}
.burger{display:none;border:1px solid var(--line);background:none;font-size:19px;width:40px;height:38px;color:var(--ink)}

/* 首屏 */
.hero{padding:clamp(64px,8vw,110px) 0 clamp(52px,6vw,80px);border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:end}
.kicker{font-size:12px;letter-spacing:.24em;text-transform:uppercase;color:var(--gold);margin-bottom:22px}
.hero h1{margin-bottom:26px}
.hero h1 .thin{display:block;font-weight:400;color:#3f4d48}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;font-size:14.5px;border-radius:2px;transition:.2s}
.btn-solid{background:var(--accent);color:#fff}
.btn-solid:hover{background:#0a5f54}
.btn-line{border:1px solid var(--line);color:var(--ink)}
.btn-line:hover{border-color:var(--accent);color:var(--accent)}
.hero-aside{border-left:1px solid var(--line);padding-left:34px}
.hero-aside h4{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin:0 0 18px;font-weight:600}
.mini-list{list-style:none;margin:0;padding:0}
.mini-list li{display:flex;justify-content:space-between;gap:16px;padding:13px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.mini-list li span:last-child{color:var(--muted);font-size:13px}

/* 数字条 */
.facts{border-bottom:1px solid var(--line);background:var(--paper)}
.facts-in{display:grid;grid-template-columns:repeat(4,1fr)}
.fact{padding:28px 8px 28px 0;border-right:1px solid var(--line)}
.fact:last-child{border-right:0;padding-left:28px}
.fact:not(:first-child){padding-left:28px}
.fact b{display:block;font-size:30px;font-weight:500;letter-spacing:-.02em}
.fact span{font-size:13px;color:var(--muted)}

/* 区块 */
.section{padding:clamp(60px,7vw,96px) 0}
.section.paper{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{display:grid;grid-template-columns:220px 1fr;gap:32px;padding-bottom:36px;border-bottom:1px solid var(--line);margin-bottom:44px}
.sec-no{font-size:12px;letter-spacing:.22em;color:var(--gold);padding-top:8px}
.sec-head h2{margin-bottom:10px}

/* 服务列表 */
.rows{border-top:1px solid var(--line)}
.row{
  display:grid;grid-template-columns:64px 1.1fr 1fr;gap:28px;align-items:start;
  padding:30px 0;border-bottom:1px solid var(--line);transition:.22s;
}
.row:hover{background:var(--accent-soft)}
.row .idx{font-size:13px;color:var(--gold);letter-spacing:.1em;padding-top:4px}
.row h3{margin-bottom:8px}
.row p{font-size:14.5px}
.row ul{margin:0;padding-left:18px;color:var(--muted);font-size:14px;line-height:1.95}

/* 流程 */
.phases{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);background:var(--paper)}
.phase{padding:30px 24px;border-right:1px solid var(--line)}
.phase:last-child{border-right:0}
.phase .n{font-size:12px;letter-spacing:.18em;color:var(--gold);margin-bottom:14px}
.phase h3{font-size:17px;margin-bottom:8px}
.phase p{font-size:13.6px}

/* 引言块 */
.quote{border-left:3px solid var(--accent);padding:8px 0 8px 28px;margin:0}
.quote p{font-size:clamp(19px,2.2vw,24px);line-height:1.75;color:#2c3a35}
.quote cite{display:block;margin-top:14px;font-style:normal;font-size:13.5px;color:var(--muted)}

/* 页头 */
.page-head{padding:clamp(58px,7vw,92px) 0 clamp(36px,4vw,52px);border-bottom:1px solid var(--line);background:var(--paper)}
.page-head h1{font-size:clamp(32px,4.4vw,50px);margin:16px 0 16px}

/* 关于 */
.about{display:grid;grid-template-columns:1.1fr .9fr;gap:52px}
.fact-table{width:100%;border-collapse:collapse;font-size:14px}
.fact-table td{padding:13px 0;border-bottom:1px solid var(--line);vertical-align:top}
.fact-table td:first-child{color:var(--muted);width:140px}

/* 联系 */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.contact dl{margin:0}
.contact dt{font-size:12px;letter-spacing:.16em;color:var(--gold);margin-top:22px}
.contact dd{margin:6px 0 0;font-size:15.5px;color:#2c3a35;word-break:break-all}
.contact .note{background:var(--accent-soft);padding:30px;border-radius:2px}
.contact .note ul{margin:12px 0 0;padding-left:18px;color:#41504b;font-size:14.5px;line-height:2}

/* 页脚 */
.footer{background:var(--dark);color:#d9e4df;padding:56px 0 30px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr .8fr .8fr;gap:40px}
.footer h4{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:#87a49b;margin:0 0 14px;font-weight:600}
.footer p{color:#a9bdb6;font-size:13.5px;line-height:1.95}
.footer a{display:block;color:#cfe0da;font-size:13.5px;padding:4px 0}
.footer a:hover{color:#fff}
.footer .brandline{font-size:17px;font-weight:600;color:#fff;margin-bottom:12px;letter-spacing:.02em}
.footer .legal{margin-top:36px;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12.5px;color:#8fa8a0}
.footer .legal a{color:#c9dad4;display:inline}
.footer .legal a:hover{color:#fff}

/* 动效 */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

@media (max-width:980px){
  .hero-grid,.about,.contact,.footer-grid{grid-template-columns:1fr}
  .hero-aside{border-left:0;padding-left:0;border-top:1px solid var(--line);padding-top:28px}
  .facts-in{grid-template-columns:repeat(2,1fr)}
  .fact:nth-child(2){border-right:0}
  .fact:nth-child(3){padding-left:0}
  .sec-head{grid-template-columns:1fr;gap:10px}
  .phases{grid-template-columns:repeat(2,1fr)}
  .phase:nth-child(2){border-right:0}
  .row{grid-template-columns:44px 1fr;gap:16px}
  .row ul{grid-column:2}
  .nav-links{display:none;position:absolute;top:74px;left:28px;right:28px;background:var(--paper);
    border:1px solid var(--line);flex-direction:column;align-items:flex-start;gap:2px;padding:14px}
  .nav-links.open{display:flex}
  .nav-links a{width:100%;padding:10px 8px}
  .top-cta{display:none}
  .burger{display:block}
}
@media (max-width:600px){
  .facts-in{grid-template-columns:1fr}
  .fact{border-right:0;padding-left:0!important}
  .phases{grid-template-columns:1fr}
  .phase{border-right:0;border-bottom:1px solid var(--line)}
}