/* ============================================================
   ZHONGRUN HUAXING — Global Power Solution Provider
   Brand: navy #1B3A6B / emerald #0FA57C / gray-blue #8A9AB0
   ============================================================ */
:root{
  --navy:#1B3A6B;
  --navy-deep:#12294D;
  --navy-ink:#0E2140;
  --emerald:#0FA57C;
  --emerald-dark:#0B7E60;
  --gray-blue:#8A9AB0;
  --ink:#1F2A3A;
  --muted:#5B6B80;
  --line:#E4E9F0;
  --bg-soft:#F5F7FA;
  --white:#FFFFFF;
  --radius:12px;
  --shadow:0 12px 32px rgba(18,41,77,.10);
  --font:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:104px} /* 避免吸顶导航遮挡锚点目标 */
body{font-family:var(--font);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}
ul{list-style:none}
::selection{background:rgba(15,165,124,.22);color:var(--navy-ink)}

/* ---------- language visibility ---------- */
/* 仅隐藏 span 级语言标记；不能对 .lang-zh 整体隐藏，否则 html 根节点会被隐藏 */
span.lang-en,span.lang-zh{display:none}
html.lang-zh span.lang-zh{display:inline}
html.lang-en span.lang-en{display:inline}

.container{max-width:1200px;margin:0 auto;padding:0 28px}
.section{padding:96px 0}
.section.soft{background:var(--bg-soft)}

/* ---------- typography ---------- */
.eyebrow{display:inline-block;font-size:12.5px;font-weight:600;letter-spacing:.2em;
  text-transform:uppercase;color:var(--emerald);margin-bottom:14px}
h1,h2,h3,h4{color:var(--navy-ink);font-weight:600;line-height:1.3}
h2{font-size:38px;letter-spacing:-.01em;margin-bottom:18px}
h3{font-size:20px}
.lead{font-size:17.5px;color:var(--muted);max-width:780px}
.section-head{max-width:820px;margin-bottom:52px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head.center .lead{margin:0 auto}

/* ---------- buttons ---------- */
.btn{display:inline-block;padding:14px 30px;border-radius:8px;font-size:15px;font-weight:600;
  letter-spacing:.02em;transition:all .25s ease;border:1.5px solid transparent;cursor:pointer}
.btn-primary{background:linear-gradient(160deg,#22497F,var(--navy) 55%,#152E55);color:#fff;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.14),0 6px 16px rgba(18,41,77,.18)}
.btn-primary:hover{background:linear-gradient(160deg,#1D3E6C,var(--navy-deep) 55%,#122544);transform:translateY(-2px);box-shadow:inset 0 1px 0 rgba(255,255,255,.14),var(--shadow)}
.btn-accent{background:linear-gradient(160deg,#14B589,var(--emerald) 50%,var(--emerald-dark));color:#fff;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.2),0 6px 16px rgba(15,165,124,.22)}
.btn-accent:hover{background:linear-gradient(160deg,#0FA57C,var(--emerald-dark) 60%,#096B50);transform:translateY(-2px);box-shadow:inset 0 1px 0 rgba(255,255,255,.2),var(--shadow)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-outline{border-color:var(--navy);color:var(--navy)}
.btn-outline:hover{background:var(--navy);color:#fff}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:96px}
.brand{display:flex;align-items:center;flex-shrink:0}
.brand img{height:74px;width:auto;display:block}
.main-nav{display:flex;align-items:center;gap:34px}
.main-nav a{font-size:15px;font-weight:500;color:var(--ink);position:relative;padding:6px 0}
.main-nav a:hover{color:var(--navy)}
.main-nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;
  background:var(--emerald);transition:width .25s}
.main-nav a:hover::after,.main-nav a.active::after{width:100%}
.main-nav a.active{color:var(--navy);font-weight:600}
.header-actions{display:flex;align-items:center;gap:16px}
.lang-switch{background:none;border:1.5px solid var(--line);border-radius:8px;
  padding:8px 14px;font-family:var(--font);font-size:13.5px;font-weight:600;
  color:var(--navy);cursor:pointer;transition:all .2s;
  display:inline-flex;align-items:center;line-height:1;white-space:nowrap}
.lang-switch:hover{border-color:var(--navy)}
.header-cta{padding:10px 22px;font-size:14px}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--navy);margin:5px 0;transition:.3s}

/* ---------- hero ---------- */
.hero{position:relative;min-height:740px;display:flex;align-items:center;overflow:hidden;
  background:radial-gradient(1100px 560px at 82% 118%,rgba(15,165,124,.16),transparent 62%),var(--navy-deep)}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.55;
  filter:saturate(1.18) brightness(1.08) contrast(1.03)}
.hero::after{content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(14,33,64,.92) 0%,rgba(18,41,77,.72) 45%,rgba(18,41,77,.25) 100%)}
.hero .container{position:relative;z-index:2;width:100%}
.hero-content{max-width:720px;padding:60px 0}
.hero-kicker{display:inline-flex;align-items:center;gap:10px;color:#7BE0C3;font-size:13px;
  font-weight:600;letter-spacing:.22em;text-transform:uppercase;margin-bottom:22px}
.hero-kicker::before{content:"";width:34px;height:2px;background:var(--emerald)}
.hero h1{color:#fff;font-size:56px;line-height:1.16;margin-bottom:24px;font-weight:600;letter-spacing:-.01em}
.hero h1 em{font-style:normal;color:#5FD6AE}
.hero p{color:rgba(255,255,255,.85);font-size:18px;max-width:600px;margin-bottom:36px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}

/* page hero (subpages) */
.page-hero{position:relative;background:radial-gradient(900px 420px at 88% 120%,rgba(15,165,124,.14),transparent 62%),var(--navy-deep);color:#fff;overflow:hidden}
.page-hero .hero-bg{opacity:.4}
.page-hero::after{content:"";position:absolute;inset:0;
  background:linear-gradient(95deg,rgba(14,33,64,.94) 0%,rgba(18,41,77,.7) 55%,rgba(18,41,77,.3) 100%)}
.page-hero .container{position:relative;z-index:2;padding-top:120px;padding-bottom:96px}
.page-hero h1{color:#fff;font-size:42px;margin-bottom:14px}
.page-hero .crumb{color:var(--gray-blue);font-size:14px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:26px}
.page-hero p{color:rgba(255,255,255,.82);max-width:640px;font-size:17px}

/* ---------- stats band ---------- */
.stats-band{background:var(--navy);color:#fff;padding:56px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:center}
.stat b{display:block;font-size:44px;font-weight:600;color:#fff;line-height:1.15;
  font-variant-numeric:tabular-nums;letter-spacing:.01em}
.stat b i{font-style:normal;color:#5FD6AE}
.stat span{font-size:14px;color:rgba(255,255,255,.72);letter-spacing:.04em}
@media(min-width:1025px){
  .stats-grid .stat+.stat{position:relative}
  .stats-grid .stat+.stat::before{content:"";position:absolute;left:-16px;top:14%;height:72%;width:1px;
    background:linear-gradient(180deg,transparent,rgba(255,255,255,.22),transparent)}
}

/* ---------- cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.card-grid.two{grid-template-columns:repeat(2,1fr)}
.card-grid.four{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 30px;transition:transform .3s,box-shadow .3s,border-color .3s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#CBD8E7}
.card .icon{width:52px;height:52px;border-radius:12px;background:linear-gradient(135deg,#EAF6F1,#DFF2EC);
  display:flex;align-items:center;justify-content:center;margin-bottom:22px}
.card .icon svg{width:26px;height:26px;stroke:var(--emerald);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.card h3{margin-bottom:12px;font-size:19px}
.card p{font-size:14.5px;color:var(--muted);flex:1}
.card .more{margin-top:18px;font-size:14px;font-weight:600;color:var(--emerald);display:inline-flex;align-items:center;gap:6px}
.card .more:hover{gap:10px}
.card .more{transition:gap .2s}

/* service detail rows */
.svc-row{display:grid;grid-template-columns:64px 1fr;gap:24px;padding:38px 0;border-bottom:1px solid var(--line)}
.svc-row:last-child{border-bottom:none}
.svc-num{font-size:15px;font-weight:600;color:var(--emerald);letter-spacing:.1em;padding-top:4px}
.svc-body h3{font-size:21px;margin-bottom:10px}
.svc-body p{color:var(--muted);font-size:15.5px;max-width:840px}
.svc-tags{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px}
.svc-tags span{font-size:13px;color:var(--navy);background:#EEF3FA;border-radius:6px;padding:5px 12px}

/* sector cards (image top) */
.sector-card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:#fff;transition:transform .3s,box-shadow .3s;display:flex;flex-direction:column}
.sector-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.sector-card .thumb{height:190px;background:var(--navy-deep);overflow:hidden}
.sector-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.sector-card:hover .thumb img{transform:scale(1.05)}
.sector-card .body{padding:26px 26px 30px;flex:1;display:flex;flex-direction:column}
.sector-card h3{font-size:18.5px;margin-bottom:10px}
.sector-card p{font-size:14.5px;color:var(--muted);flex:1}

/* lifecycle */
.lifecycle{display:grid;grid-template-columns:repeat(6,1fr);gap:18px}
.step{text-align:left;padding:26px 22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.step i{font-style:normal;font-size:13px;font-weight:600;color:var(--emerald);letter-spacing:.12em}
.step h4{font-size:16.5px;margin:10px 0 8px}
.step p{font-size:13.5px;color:var(--muted);line-height:1.6}

/* why us */
.why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.why-item{display:grid;grid-template-columns:56px 1fr;gap:20px;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius);padding:32px 30px;transition:box-shadow .3s}
.why-item:hover{box-shadow:var(--shadow)}
.why-item .icon{width:52px;height:52px;border-radius:50%;background:#EAF6F1;
  display:flex;align-items:center;justify-content:center}
.why-item .icon svg{width:24px;height:24px;stroke:var(--emerald);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.why-item h3{font-size:18px;margin-bottom:8px}
.why-item p{font-size:14.5px;color:var(--muted)}

/* ---------- projects ---------- */
.filters{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:40px}
.filter-chip{background:#fff;border:1.5px solid var(--line);border-radius:999px;
  padding:9px 20px;font-family:var(--font);font-size:14px;font-weight:500;color:var(--muted);
  cursor:pointer;transition:all .2s}
.filter-chip:hover{border-color:var(--navy);color:var(--navy)}
.filter-chip.active{background:var(--navy);border-color:var(--navy);color:#fff}
.filter-label{font-size:13px;font-weight:600;color:var(--gray-blue);letter-spacing:.1em;
  text-transform:uppercase;align-self:center;margin-right:4px}
.project-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.project-card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:#fff;display:flex;flex-direction:column;transition:transform .3s,box-shadow .3s}
.project-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.project-card .thumb{height:200px;overflow:hidden;background:var(--bg-soft)}
.project-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s;
  filter:saturate(1.06) contrast(1.02)}
.project-card:hover .thumb img{transform:scale(1.05);filter:saturate(1.12) contrast(1.04)}
.project-card .body{padding:24px 24px 26px;flex:1;display:flex;flex-direction:column}
.project-card .meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.project-card .meta span{font-size:12px;font-weight:600;letter-spacing:.05em;border-radius:5px;padding:3px 10px}
.project-card .meta .type{background:#EAF6F1;color:var(--emerald-dark)}
.project-card .meta .region{background:#EEF3FA;color:var(--navy)}
.project-card h3{font-size:17px;line-height:1.45;margin-bottom:10px}
.project-card .cap{font-size:13.5px;color:var(--emerald-dark);font-weight:600;margin-bottom:8px}
.project-card .scope{font-size:13.5px;color:var(--muted);flex:1}
.project-card .year{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line);
  font-size:12.5px;color:var(--gray-blue);letter-spacing:.05em}
.empty-tip{grid-column:1/-1;text-align:center;color:var(--gray-blue);padding:60px 0;font-size:15px}

/* global footprint */
.globe-band{color:#fff;position:relative;overflow:hidden;
  background:radial-gradient(1000px 480px at 88% -8%,rgba(15,165,124,.15),transparent 60%),var(--navy-deep)}
.globe-band .section-head h2{color:#fff}
.globe-band .section-head .lead{color:rgba(255,255,255,.75)}
.globe-band .eyebrow{color:#5FD6AE}
.country-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.country{border:1px solid rgba(255,255,255,.16);border-radius:10px;padding:18px 20px;
  display:flex;align-items:center;gap:12px;transition:background .25s}
.country:hover{background:rgba(255,255,255,.07)}
.country .dot{width:8px;height:8px;border-radius:50%;background:var(--emerald);flex-shrink:0}
.country b{font-size:14.5px;font-weight:600;color:#fff;display:block;line-height:1.3}
.country span{font-size:12.5px;color:rgba(255,255,255,.6)}

/* clients */
.client-band{background:var(--bg-soft)}
.client-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.client-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px 28px;text-align:center}
.client-card .icon{width:58px;height:58px;margin:0 auto 18px;border-radius:50%;
  background:#EAF6F1;display:flex;align-items:center;justify-content:center}
.client-card .icon svg{width:27px;height:27px;stroke:var(--emerald);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.client-card h3{font-size:17px;margin-bottom:8px}
.client-card p{font-size:13.5px;color:var(--muted)}

/* ---------- CTA band ---------- */
.cta-band{color:#fff;padding:96px 0;text-align:center;
  background:radial-gradient(820px 400px at 50% 128%,rgba(15,165,124,.2),transparent 62%),
    linear-gradient(115deg,var(--navy-deep),var(--navy) 60%,#1E4A80)}
.cta-band h2{color:#fff;font-size:36px;margin-bottom:14px}
.cta-band p{color:rgba(255,255,255,.78);max-width:640px;margin:0 auto 34px;font-size:16.5px}
.cta-band .btn-ghost{margin-left:14px}

/* ---------- footer ---------- */
.site-footer{background:var(--navy-ink);color:rgba(255,255,255,.72);padding:72px 0 0;font-size:14.5px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:48px;padding-bottom:56px}
/* 白色版标识直接压在深蓝底上，不再加白色底板，避免“贴膏药”感 */
.footer-brand{display:block;margin-bottom:24px;padding:0}
.footer-brand img{height:64px;width:auto;display:block}
.site-footer h4{color:#fff;font-size:15px;letter-spacing:.06em;margin-bottom:20px;font-weight:600}
.site-footer ul li{margin-bottom:11px}
.site-footer ul a{color:rgba(255,255,255,.72);transition:color .2s}
.site-footer ul a:hover{color:#5FD6AE}
.footer-about p{line-height:1.8;max-width:340px}
.footer-contact li{display:flex;gap:10px;margin-bottom:14px;line-height:1.6}
.footer-contact svg{width:17px;height:17px;stroke:#5FD6AE;fill:none;stroke-width:1.8;flex-shrink:0;margin-top:4px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:22px 0;
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;font-size:13px;color:rgba(255,255,255,.45)}

/* ---------- contact page ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:56px;align-items:start}
.contact-info-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:38px 34px}
.contact-info-card h3{margin-bottom:8px}
.contact-info-card .sub{font-size:14px;color:var(--muted);margin-bottom:28px}
.contact-line{display:grid;grid-template-columns:44px 1fr;gap:14px;padding:16px 0;border-bottom:1px dashed var(--line)}
.contact-line:last-child{border-bottom:none}
.contact-line .icon{width:40px;height:40px;border-radius:10px;background:#EAF6F1;
  display:flex;align-items:center;justify-content:center}
.contact-line .icon svg{width:19px;height:19px;stroke:var(--emerald);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
/* WhatsApp 图标为填充型，需覆盖描边型图标默认样式；选择器权重须高于 .contact-line .icon svg */
svg.icon-wa,
.contact-line .icon svg.icon-wa,
.footer-contact svg.icon-wa{fill:#5FD6AE;stroke:none}
.contact-line b{display:block;font-size:13px;color:var(--gray-blue);letter-spacing:.06em;text-transform:uppercase;font-weight:600;margin-bottom:2px}
.contact-line span{font-size:15px;color:var(--ink)}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:40px 38px;box-shadow:var(--shadow)}
.contact-form h3{margin-bottom:6px}
.contact-form .sub{font-size:14px;color:var(--muted);margin-bottom:26px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:13.5px;font-weight:600;color:var(--navy-ink);margin-bottom:7px}
.form-group input,.form-group select,.form-group textarea{
  width:100%;padding:13px 15px;border:1.5px solid var(--line);border-radius:8px;
  font-family:var(--font);font-size:14.5px;color:var(--ink);background:#fff;transition:border .2s}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{
  outline:none;border-color:var(--emerald);box-shadow:0 0 0 3px rgba(15,165,124,.12)}
.form-group textarea{resize:vertical;min-height:120px}
.form-note{font-size:12.5px;color:var(--gray-blue);margin-top:14px}
.form-ok{display:none;background:#EAF6F1;border:1px solid #BCE5D6;color:var(--emerald-dark);
  border-radius:8px;padding:14px 18px;font-size:14.5px;margin-bottom:20px}
.form-msg{display:none;background:#FDECEC;border:1px solid #F4C2C2;color:#B42318;
  border-radius:8px;padding:14px 18px;font-size:14.5px;margin-bottom:20px}
.form-msg.show,.form-ok.show{display:block}

/* ---------- about page ---------- */
.about-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:60px;align-items:center}
.about-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.about-img img{width:100%;height:100%;object-fit:cover}
.values-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.value-card{text-align:left;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px}
.value-card i{font-style:normal;font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--emerald);text-transform:uppercase}
.value-card h3{font-size:18px;margin:10px 0 8px}
.value-card p{font-size:14px;color:var(--muted)}
.mv-band{background:var(--bg-soft)}
.mv-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.mv-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:44px 40px}
.mv-card .eyebrow{margin-bottom:10px}
.mv-card h3{font-size:22px;margin-bottom:14px}
.mv-card p{color:var(--muted);font-size:15.5px}

/* ---------- reveal animation ---------- */
/* ---------- FAQ (SEO: 长尾问答 + FAQPage 结构化数据) ---------- */
.faq-list{max-width:880px;margin:0 auto;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line);padding:24px 0}
.faq-q{position:relative;font-size:18px;font-weight:600;color:var(--navy-ink);padding-left:30px;margin:0}
.faq-q::before{content:"Q";position:absolute;left:0;top:1px;width:20px;height:20px;border-radius:5px;
  background:var(--navy);color:#fff;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}
.faq-a{position:relative;padding:12px 0 0 30px}
.faq-a::before{content:"A";position:absolute;left:0;top:14px;width:20px;height:20px;border-radius:5px;
  background:var(--emerald);color:#fff;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}
.faq-a p{color:var(--muted);font-size:16px;margin:0}
@media(max-width:680px){.faq-q{font-size:16.5px}.faq-a p{font-size:15px}}

.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media(max-width:1024px){
  h2{font-size:29px}
  .hero h1{font-size:40px}
  .header-inner{height:88px}
  .brand img{height:64px}
  .card-grid,.card-grid.four,.project-grid,.client-grid,.values-grid{grid-template-columns:repeat(2,1fr)}
  .lifecycle{grid-template-columns:repeat(3,1fr)}
  .stats-grid,.country-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .about-grid,.contact-grid,.why-grid,.mv-grid{grid-template-columns:1fr}
  .procure-imgs{grid-template-columns:1fr !important}
}
@media(max-width:680px){
  .section{padding:64px 0}
  .main-nav{position:fixed;inset:96px 0 auto 0;background:#fff;flex-direction:column;
    align-items:flex-start;gap:0;padding:10px 28px 22px;border-bottom:1px solid var(--line);
    display:none;box-shadow:0 18px 30px rgba(18,41,77,.12)}
  .main-nav.open{display:flex}
  .main-nav a{padding:13px 0;width:100%;border-bottom:1px solid var(--bg-soft)}
  .nav-toggle{display:block}
  .header-cta{display:none}
  .header-inner{height:80px}
  .brand img{height:54px}
  .footer-brand img{height:52px}
  .hero{min-height:600px}
  .hero h1{font-size:34px}
  .page-hero h1{font-size:31px}
  .card-grid,.card-grid.two,.card-grid.four,.project-grid,.client-grid,.values-grid,
  .lifecycle,.stats-grid,.country-grid,.form-row,.footer-grid{grid-template-columns:1fr}
  .stat b{font-size:34px}
  .footer-bottom{justify-content:center;text-align:center}
}

/* ============ 项目详情页 ============ */
a.card-title{color:var(--navy);text-decoration:none;transition:color .2s}
a.card-title:hover{color:var(--emerald)}
.detail-hero .detail-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.detail-tags span{font-size:12.5px;font-weight:600;letter-spacing:.04em;padding:6px 14px;border-radius:999px;
  background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.28)}
.detail-tags .year{background:rgba(15,165,124,.9);border-color:transparent}
.detail-facts{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:-46px;position:relative;z-index:3}
.fact{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 22px;box-shadow:0 14px 30px rgba(18,41,77,.06)}
.fact-k{display:block;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--gray-blue);font-weight:600;margin-bottom:8px}
.fact-v{display:block;font-size:16px;font-weight:700;color:var(--navy);line-height:1.4}
.detail-layout{display:grid;grid-template-columns:1fr 320px;gap:48px;align-items:start}
.detail-main .lead{font-size:16.5px;line-height:1.9;color:var(--ink)}
.detail-main .lead.wide{max-width:920px}
.callout{margin-top:26px;background:var(--bg-soft);border-left:4px solid var(--emerald);border-radius:0 12px 12px 0;padding:20px 24px}
.callout-k{font-size:13px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--emerald-dark);margin-bottom:8px}
.callout p{margin:0 0 10px;line-height:1.85;color:var(--ink)}
.callout-cap{font-size:14px !important;color:var(--muted) !important;font-weight:600}
.detail-side{position:sticky;top:110px}
.side-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:0 14px 30px rgba(18,41,77,.06)}
.side-card h4{margin:0 0 14px;color:var(--navy)}
.side-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.side-list li{position:relative;padding-left:20px;font-size:14.5px;line-height:1.6;color:var(--ink)}
.side-list li:before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:2px;background:var(--emerald)}
.detail-gallery{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:8px}
.detail-gallery picture,.detail-gallery img{width:100%;border-radius:14px;display:block;aspect-ratio:16/9;object-fit:cover}
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:8px}
.rel-card{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;text-decoration:none;
  color:inherit;transition:transform .2s,box-shadow .2s}
.rel-card:hover{transform:translateY(-4px);box-shadow:0 18px 34px rgba(18,41,77,.12)}
.rel-thumb picture,.rel-thumb img{width:100%;display:block;aspect-ratio:16/9;object-fit:cover}
.rel-body{padding:16px 18px}
.rel-type{font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--emerald-dark)}
.rel-body h4{margin:8px 0 6px;font-size:16px;color:var(--navy);line-height:1.4}
.rel-cap{font-size:13.5px;color:var(--muted);line-height:1.5}
@media(max-width:980px){
  .detail-layout{grid-template-columns:1fr;gap:28px}
  .detail-side{position:static}
  .detail-facts{grid-template-columns:repeat(2,1fr)}
  .rel-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  .detail-facts,.rel-grid,.detail-gallery{grid-template-columns:1fr}
}