/* ===== Gongmao — Black & Gold Industrial ===== */
:root{
  --bg:#0b0d10; --bg2:#10131a; --panel:#141822; --line:rgba(212,165,69,.18);
  --gold:#d4a545; --gold-l:#f3dd9a; --gold-d:#9a7420;
  --txt:#eceae4; --muted:#9aa2ad;
  --serif:"Cinzel","Noto Serif SC",Georgia,serif;
  --sans:"Inter","Noto Sans SC","Segoe UI",system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--txt);font-family:var(--sans);font-weight:300;line-height:1.7;letter-spacing:.01em;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(1200px,92%);margin:0 auto}
html[lang="zh"] body{line-height:1.85}

/* ===== Nav ===== */
.nav{position:fixed;inset:0 0 auto 0;z-index:100;transition:.35s;padding:18px 0}
.nav.scrolled{background:rgba(11,13,16,.92);backdrop-filter:blur(14px);padding:10px 0;border-bottom:1px solid var(--line)}
.nav-inner{width:min(1280px,94%);margin:0 auto;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;margin-right:auto}
.brand-logo{height:44px;width:auto;display:block}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-family:var(--serif);font-size:1.15rem;color:var(--gold-l);letter-spacing:.14em}
.brand-text em{font-style:normal;font-size:.62rem;color:var(--muted);letter-spacing:.22em;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:26px;font-size:.86rem;font-weight:400}
.nav-links a:not(.btn){color:#cfd4da;position:relative;padding:6px 0}
.nav-links a:not(.btn)::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--gold);transition:.3s}
.nav-links a:not(.btn):hover::after{width:100%}
.nav-links a:not(.btn):hover{color:var(--gold-l)}
.nav-tools{display:flex;align-items:center;gap:14px}
.lang-btn{background:transparent;border:1px solid var(--line);color:var(--gold-l);padding:7px 14px;border-radius:2px;cursor:pointer;font-size:.8rem;letter-spacing:.1em;transition:.3s}
.lang-btn:hover{border-color:var(--gold);background:rgba(212,165,69,.1)}
.burger{display:none;background:none;border:0;cursor:pointer;flex-direction:column;gap:5px;padding:6px}
.burger span{width:22px;height:2px;background:var(--gold-l);transition:.3s}

/* ===== Buttons ===== */
.btn{display:inline-block;padding:14px 34px;font-size:.85rem;letter-spacing:.16em;text-transform:uppercase;font-weight:500;border:1px solid transparent;cursor:pointer;transition:.3s;border-radius:2px;background:transparent}
.btn-gold{background:linear-gradient(120deg,var(--gold-d),var(--gold) 45%,var(--gold-l));color:#151005;box-shadow:0 6px 24px rgba(212,165,69,.28)}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(212,165,69,.4)}
.btn-ghost{border-color:rgba(255,255,255,.28);color:var(--txt)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold-l)}
.btn-sm{padding:9px 20px;font-size:.75rem}

/* ===== Hero ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;animation:heroZoom 22s ease-in-out infinite alternate}
@keyframes heroZoom{from{transform:scale(1)}to{transform:scale(1.12)}}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(100deg,rgba(8,9,12,.94) 8%,rgba(8,9,12,.72) 42%,rgba(8,9,12,.32) 78%),linear-gradient(to top,var(--bg),transparent 30%)}
.hero-content{position:relative;z-index:2;padding-top:70px}
.hero-kicker{color:var(--gold);letter-spacing:.34em;font-size:.78rem;text-transform:uppercase;margin-bottom:22px}
.hero h1{font-family:var(--serif);font-size:clamp(2.1rem,5.2vw,4.1rem);font-weight:600;line-height:1.18;color:#fff;max-width:18ch}
html[lang="zh"] .hero h1{font-size:clamp(2.2rem,5.4vw,4rem);letter-spacing:.06em}
.hero-sub{margin:26px 0 38px;max-width:62ch;color:#c9cdd4;font-size:1.02rem}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.hero-scroll{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);width:1px;height:54px;background:linear-gradient(var(--gold),transparent);z-index:2}
.hero-scroll::before{content:"";position:absolute;top:0;left:-3px;width:7px;height:7px;border-radius:50%;background:var(--gold);animation:drop 1.8s infinite}
@keyframes drop{0%{top:0;opacity:1}80%{top:46px;opacity:0}100%{opacity:0}}

/* ===== Stats ===== */
.stats{padding:44px 0;position:relative}
.stats-bg{background:linear-gradient(rgba(11,13,16,.88),rgba(11,13,16,.88)),url('../img/crane-bw.jpg') center/cover no-repeat;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;text-align:center}
.stat-num{display:block;font-family:var(--serif);font-size:clamp(1.7rem,3vw,2.5rem);color:var(--gold-l);font-weight:600}
.stat-label{font-size:.8rem;color:var(--muted);letter-spacing:.04em}

/* ===== Sections ===== */
.section{padding:110px 0}
.section-dark{background:var(--bg2)}
.sec-head{max-width:720px;margin-bottom:56px}
.sec-kicker{color:var(--gold);letter-spacing:.3em;font-size:.75rem;text-transform:uppercase;margin-bottom:14px;display:flex;align-items:center;gap:12px}
.sec-kicker::before{content:"";width:34px;height:1px;background:var(--gold)}
.section h2{font-family:var(--serif);font-size:clamp(1.6rem,3.4vw,2.5rem);font-weight:600;line-height:1.25;color:#fff}
html[lang="zh"] .section h2{letter-spacing:.04em}

/* About */
.about-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:64px;align-items:center}
.about-media{position:relative}
.about-media img{border-radius:3px;box-shadow:0 30px 80px rgba(0,0,0,.5)}
.about-media::before{content:"";position:absolute;inset:18px -18px -18px 18px;border:1px solid var(--line);border-radius:3px;z-index:-1}
.about-badge{position:absolute;bottom:-24px;right:-14px;background:linear-gradient(135deg,var(--gold-d),var(--gold));color:#151005;padding:16px 24px;border-radius:3px;display:flex;flex-direction:column;line-height:1.35;box-shadow:0 14px 40px rgba(212,165,69,.35)}
.about-badge strong{font-size:.95rem}
.about-badge span{font-size:.72rem;opacity:.85}
.about-text p+p{margin-top:18px}
.about-text p:not(.sec-kicker){color:#c3c8cf;font-size:.98rem}

/* Segments */
.seg-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.seg-card{background:var(--panel);border:1px solid rgba(255,255,255,.05);border-radius:3px;overflow:hidden;transition:.4s;display:flex;flex-direction:column}
.seg-card:hover{transform:translateY(-8px);border-color:var(--line);box-shadow:0 24px 60px rgba(0,0,0,.45)}
.seg-img{overflow:hidden;aspect-ratio:4/3}
.seg-img img{width:100%;height:100%;object-fit:cover;transition:.6s}
.seg-card:hover .seg-img img{transform:scale(1.07)}
.seg-body{padding:26px 24px 30px;position:relative;flex:1}
.seg-no{position:absolute;top:18px;right:22px;font-family:var(--serif);font-size:1.5rem;color:rgba(212,165,69,.28);font-weight:700}
.seg-body h3{font-family:var(--serif);font-size:1.06rem;color:var(--gold-l);margin-bottom:12px;font-weight:600}
.seg-body p{color:var(--muted);font-size:.86rem}

/* Projects */
.case-list{display:flex;flex-direction:column;gap:28px}
.case-card{position:relative;overflow:hidden;border-radius:3px;height:clamp(300px,42vw,480px);background:var(--panel);border:1px solid rgba(255,255,255,.06)}
.case-card img{width:100%;height:100%;object-fit:cover;transition:.7s}
.case-card:hover img{transform:scale(1.04)}
.case-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:flex-end;padding:34px;background:linear-gradient(to top,rgba(7,8,10,.94) 24%,rgba(7,8,10,.3) 62%,transparent)}
.case-tag{color:var(--gold);font-size:.68rem;letter-spacing:.26em;text-transform:uppercase;margin-bottom:10px}
.case-overlay h3{font-family:var(--serif);font-size:1.35rem;color:#fff;font-weight:600;margin-bottom:8px}
.case-overlay p{color:#b9bec6;font-size:.9rem;max-width:60ch;opacity:0;transform:translateY(10px);transition:.45s}
.case-card:hover .case-overlay p{opacity:1;transform:none}

/* Manufacturing */
.mfg-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:26px;margin-bottom:44px}
.mfg-media img{border-radius:3px;height:100%;object-fit:cover;box-shadow:0 24px 70px rgba(0,0,0,.45)}
.mfg-video video{width:100%;border-radius:3px;background:#000;box-shadow:0 24px 70px rgba(0,0,0,.45)}
.video-cap{margin-top:12px;color:var(--muted);font-size:.8rem;letter-spacing:.05em}
.mfg-sub{color:var(--gold);font-size:.78rem;letter-spacing:.3em;text-transform:uppercase;margin:0 0 18px}
.equip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.equip-card{background:#f5f4f0;border-radius:3px;overflow:hidden;border:1px solid rgba(255,255,255,.06);transition:.35s}
.equip-card:hover{transform:translateY(-6px)}
.equip-card img{aspect-ratio:4/3;object-fit:contain;width:100%;display:block;background:#f5f4f0;padding:10px}
.equip-card figcaption{background:var(--panel);padding:12px 10px;text-align:center;font-size:.78rem;color:#cfd4da;letter-spacing:.03em;min-height:56px;display:flex;align-items:center;justify-content:center}

/* Process */
.steps{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:20px;counter-reset:step}
.steps li{background:var(--panel);border:1px solid rgba(255,255,255,.05);border-radius:3px;padding:30px 24px;position:relative;transition:.35s}
.steps li:hover{border-color:var(--line);transform:translateY(-6px)}
.steps li span{font-family:var(--serif);font-size:2rem;color:rgba(212,165,69,.35);font-weight:700;display:block;margin-bottom:14px}
.steps h3{font-size:.98rem;font-weight:600;color:var(--gold-l);margin-bottom:10px}
.steps p{color:var(--muted);font-size:.83rem}

/* Certifications */
.cert-badges{display:flex;flex-wrap:wrap;gap:12px;margin:-26px 0 40px}
.cert-badges span{border:1px solid var(--gold);color:var(--gold-l);padding:10px 22px;border-radius:2px;font-size:.82rem;letter-spacing:.08em;background:rgba(212,165,69,.08)}
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cert-card{background:var(--panel);border:1px solid rgba(255,255,255,.05);border-radius:3px;overflow:hidden;transition:.35s}
.cert-card:hover{transform:translateY(-6px);border-color:var(--line)}
.cert-card img{aspect-ratio:3/4;object-fit:contain;width:100%;background:#f5f4f0;padding:10px}
.cert-card figcaption{padding:16px;text-align:center;font-size:.86rem;color:#cfd4da;letter-spacing:.05em}

/* Contact */
.contact{background:radial-gradient(1200px 500px at 85% 10%,rgba(212,165,69,.09),transparent 60%),var(--bg2)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start}
.contact-list{list-style:none;margin-top:34px;display:grid;gap:20px}
.contact-list strong{display:block;font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--gold);margin-bottom:4px;font-weight:500}
.contact-list span{color:#c9cdd4;font-size:.94rem}
.contact-form{background:var(--panel);border:1px solid var(--line);border-radius:3px;padding:38px}
.contact-form h3{font-family:var(--serif);color:#fff;font-size:1.3rem;margin-bottom:24px;font-weight:600}
.contact-form input,.contact-form textarea{width:100%;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);color:var(--txt);padding:13px 16px;margin-bottom:14px;border-radius:2px;font-family:var(--sans);font-size:.9rem;transition:.3s;resize:vertical}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--gold);background:rgba(212,165,69,.05)}
.form-hint{margin:-16px 0 18px;font-size:.78rem;color:var(--muted)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.form-grid input,.form-grid select{margin-bottom:0;width:100%}
.contact-form select{appearance:none;-webkit-appearance:none;background:rgba(255,255,255,.04) url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23d4a545' stroke-width='1.6'/%3E%3C/svg%3E") no-repeat right 14px center;border:1px solid rgba(255,255,255,.1);color:var(--txt);padding:13px 38px 13px 16px;border-radius:2px;font-family:var(--sans);font-size:.9rem;cursor:pointer;transition:.3s}
.contact-form select:focus{outline:none;border-color:var(--gold);background-color:rgba(212,165,69,.05)}
.contact-form select.untouched{color:var(--muted)}
.contact-form select option{background:#15181d;color:#e8eaed}
@media(max-width:720px){.form-grid{grid-template-columns:1fr}}
.form-btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:6px}
.form-btns .btn{flex:1;text-align:center;white-space:nowrap}
.form-note{margin-top:16px;font-size:.75rem;color:var(--muted)}

/* Footer */
.footer{border-top:1px solid var(--line);padding:64px 0 0;background:var(--bg)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px;padding-bottom:48px}
.footer-brand .footer-logo{height:54px;margin-bottom:16px}
.footer-brand strong{font-family:var(--serif);color:var(--gold-l);letter-spacing:.14em;display:block;margin:14px 0 10px}
.footer-brand p{color:var(--muted);font-size:.86rem;max-width:34ch}
.social-row{display:flex;gap:14px;margin-top:20px}
.social-row a{width:54px;height:54px;border:1px solid var(--line);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#cfd4da;transition:.3s}
.social-row a:hover{border-color:var(--gold);color:var(--gold-l);transform:translateY(-3px)}
.social-row svg{width:26px;height:26px}
.contact-link{color:var(--gold-l);text-decoration:none;border-bottom:1px solid rgba(212,165,69,.4)}
.contact-link:hover{border-bottom-color:var(--gold-l)}
.footer-col h4{font-size:.78rem;letter-spacing:.22em;text-transform:uppercase;color:var(--gold);margin-bottom:18px;font-weight:500}
.footer-col ul{list-style:none;display:grid;gap:10px;color:#aab0b9;font-size:.85rem}
.footer-nav a:hover{color:var(--gold-l)}
.footer-bar{border-top:1px solid rgba(255,255,255,.05);padding:20px 0;text-align:center;color:#6d747d;font-size:.78rem;letter-spacing:.06em}

/* WhatsApp float */
.wa-float{position:fixed;bottom:28px;left:28px;z-index:90;width:58px;height:58px;border-radius:50%;background:#25d366;color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 30px rgba(37,211,102,.4);transition:.3s;animation:waPulse 2.4s infinite}
.wa-float:hover{transform:scale(1.1)}
.wa-float svg{width:30px;height:30px}
@keyframes waPulse{0%{box-shadow:0 0 0 0 rgba(37,211,102,.45)}70%{box-shadow:0 0 0 18px rgba(37,211,102,0)}100%{box-shadow:0 0 0 0 rgba(37,211,102,0)}}

/* Reveal animation */
.reveal{opacity:0;transform:translateY(28px);transition:.8s cubic-bezier(.16,1,.3,1)}
.reveal.visible{opacity:1;transform:none}
.delay-1{transition-delay:.12s}.delay-2{transition-delay:.24s}.delay-3{transition-delay:.36s}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .seg-grid{grid-template-columns:repeat(2,1fr)}
  .cert-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:36px}
  .equip-grid{grid-template-columns:repeat(2,1fr)}
  .case-list{gap:20px}
  .case-card{height:clamp(260px,52vw,380px)}
  .case-overlay{padding:24px}
  .case-overlay h3{font-size:1.15rem}
  .about-grid,.contact-grid,.mfg-grid{grid-template-columns:1fr;gap:44px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  .nav-links{position:fixed;top:64px;right:-100%;flex-direction:column;align-items:flex-start;background:rgba(11,13,16,.97);width:min(320px,84%);height:100vh;padding:36px 30px;gap:22px;transition:.4s;border-left:1px solid var(--line)}
  .nav-links.open{right:0}
  .burger{display:flex}
  .section{padding:76px 0}
  .hero{min-height:88vh}
  .seg-grid,.case-grid,.steps,.stats-grid,.cert-grid{grid-template-columns:1fr}
  .case-card{height:clamp(220px,58vw,320px)}
  .case-overlay p{opacity:1;transform:none}
  .footer-grid{grid-template-columns:1fr}
  .form-btns .btn{flex:none;width:100%}
}