/* ============================================================
   Gaosheng Huayu — gshydlsb.com v2.0
   Industrial manufacturer theme: deep navy + steel + safety orange
   ============================================================ */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --navy:#0d1b2e;--navy2:#14304f;--steel:#5b6b7c;--orange:#e8862e;
  --light:#f4f5f7;--white:#fff;--line:#dde3ea;--ink:#1f2a38;--muted:#6d7a89;
  --gold:#c9a034;
}
html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);line-height:1.7;background:var(--light);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:#1a5fb4;text-decoration:none}
.wrap{max-width:1140px;margin:0 auto;padding:0 24px}
.sec{padding:64px 0}
.center{text-align:center}
.lead{max-width:660px;margin:10px auto 0;color:var(--steel);font-size:1.02rem}
.sec-tag{display:inline-block;font-size:.72rem;font-weight:800;letter-spacing:2.5px;text-transform:uppercase;color:var(--orange);margin-bottom:8px}
.sub{display:inline-block;font-size:.72rem;font-weight:800;letter-spacing:2.5px;text-transform:uppercase;color:var(--gold);margin-bottom:6px}
h1,h2,h3,h4{line-height:1.28;font-weight:800}
h1{font-size:2.15rem}h2{font-size:1.65rem}h3{font-size:1.12rem}h4{font-size:.95rem}

/* ---------- Header / Nav ---------- */
header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px;gap:18px}
.logo{display:flex;align-items:center;gap:12px;color:var(--ink);font-weight:800;font-size:1.02rem}
.logo .mark{background:linear-gradient(135deg,var(--navy),var(--navy2));color:var(--orange);font-size:.74rem;font-weight:900;letter-spacing:1.5px;padding:9px 11px;border-radius:4px}
.logo small{display:block;font-size:.6rem;font-weight:600;color:var(--muted);letter-spacing:.4px;line-height:1.2}
.menu{display:flex;align-items:center;gap:20px}
.menu a{color:var(--steel);font-size:.86rem;font-weight:700;padding:4px 0;border-bottom:2px solid transparent;transition:color .2s,border-color .2s}
.menu a:hover,.menu a.on{color:var(--navy);border-color:var(--orange)}
.burger{display:none;flex-direction:column;justify-content:center;gap:5px;width:42px;height:42px;background:none;border:none;cursor:pointer}
.burger span{height:2px;width:24px;background:var(--navy);border-radius:2px;transition:.25s}
.dropdown{position:relative}
.dropdown:hover .drop-menu,.dropdown:focus-within .drop-menu{display:block}
.drop-menu{display:none;position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--line);border-radius:6px;box-shadow:0 12px 30px rgba(13,27,46,.12);min-width:270px;padding:8px;z-index:200}
.drop-menu a{display:block;padding:9px 12px;border-radius:4px;border-bottom:none;font-size:.82rem;color:var(--ink)}
.drop-menu a:hover{background:#f0f4f9;color:var(--navy);border-bottom:none}
.drop-menu a small{display:block;font-size:.68rem;color:var(--muted);font-weight:500;margin-top:1px}

/* ---------- Buttons ---------- */
.btn{display:inline-block;padding:12px 28px;border-radius:4px;font-weight:800;font-size:.9rem;letter-spacing:.4px;transition:background .2s,transform .2s,box-shadow .2s;cursor:pointer;border:2px solid transparent;text-align:center}
.btn-orange{background:var(--orange);color:#fff}
.btn-orange:hover{background:#d6751f;transform:translateY(-1px)}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy2);transform:translateY(-1px)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}

/* ---------- Hero (home) ---------- */
.hero{background:linear-gradient(135deg,#0d1b2e,#14304f 55%,#1b4a78);color:#fff;padding:92px 0 80px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 82% 18%,rgba(232,134,46,.16),transparent 40%)}
.hero::after{content:'';position:absolute;bottom:0;left:0;width:100%;height:4px;background:var(--orange)}
.hero .tagline{display:inline-block;font-size:.74rem;font-weight:800;letter-spacing:3px;text-transform:uppercase;color:#9fc3ea;border:1px solid rgba(255,255,255,.22);padding:8px 20px;border-radius:30px;margin-bottom:24px;position:relative}
.hero h1{font-size:2.6rem;font-weight:900;letter-spacing:.5px;max-width:860px;margin:0 auto;position:relative}
.hero h1 em{color:var(--orange);font-style:normal}
.hero p{font-size:1.02rem;opacity:.95;max-width:780px;margin:18px auto 0;position:relative}
.cta-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:30px;position:relative}
.stat-row{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:48px;position:relative}
.stat{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:6px;padding:18px 10px}
.stat b{display:block;font-size:1.5rem;color:#ffd76a;font-weight:900}
.stat span{font-size:.74rem;color:#c4d6ea;letter-spacing:.3px}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{background:linear-gradient(135deg,#0d1b2e,#14304f);color:#fff;padding:60px 0 54px;text-align:center}
.page-hero h1{font-size:2rem}
.page-hero p{max-width:700px;margin:14px auto 0;color:#c4d6ea;font-size:.98rem}
.crumb{margin-top:16px;font-size:.8rem;color:#8ba5c4}
.crumb a{color:#8ba5c4}
.crumb a:hover{color:#fff}
.crumb span{margin:0 8px;color:#55708f}

/* ---------- Grids & Cards ---------- */
.grid{display:grid;gap:22px}
.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:6px;padding:28px 24px;transition:transform .22s,box-shadow .22s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(13,27,46,.08)}
.card h3{margin-top:12px;font-size:1.02rem}
.card p{color:var(--muted);font-size:.9rem;margin-top:6px}
.ico{width:46px;height:46px;border-radius:5px;background:#eef3f9;display:flex;align-items:center;justify-content:center;color:var(--orange)}
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:44px;align-items:center}
.split ul{list-style:none;margin-top:14px}
.split ul li{padding:7px 0 7px 26px;position:relative;color:var(--steel);font-size:.95rem}
.split ul li::before{content:'';position:absolute;left:4px;top:16px;width:9px;height:9px;background:var(--orange);transform:rotate(45deg)}
.img-frame{border-radius:6px;overflow:hidden;box-shadow:0 14px 40px rgba(13,27,46,.14)}
.img-frame img{width:100%;height:100%;object-fit:cover;min-height:280px}

/* ---------- Trust / numbers ---------- */
.trust{background:linear-gradient(135deg,#0d1b2e,#14304f);color:#fff}
.trust .sec-tag{color:var(--orange)}
.trust h2{color:#fff}
.chips{display:flex;gap:10px;flex-wrap:wrap}
.trust .chips{display:flex;gap:10px;flex-wrap:wrap}
.trust .chip{border:1px solid rgba(255,255,255,.28);color:#d3e2f2;background:rgba(255,255,255,.06);border-radius:30px;padding:7px 16px;font-size:.78rem;font-weight:700;letter-spacing:.5px}
.chip{border:1px solid var(--line);color:var(--steel);background:#fff;border-radius:30px;padding:7px 16px;font-size:.78rem;font-weight:700;letter-spacing:.5px}
.t-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:34px}
.t-item{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:6px;padding:20px 12px;text-align:center}
.t-item b{display:block;font-size:1.6rem;color:#ffd76a;font-weight:900}
.t-item span{font-size:.76rem;color:#c4d6ea}

/* ---------- Product cards / pages ---------- */
.p-card .ph{border-radius:5px;overflow:hidden;height:190px}
.p-card .ph img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.p-card:hover .ph img{transform:scale(1.05)}
.badge{display:inline-block;background:#eef3f9;color:var(--navy);font-size:.68rem;font-weight:800;letter-spacing:1.5px;text-transform:uppercase;padding:4px 10px;border-radius:3px;margin-bottom:8px}
.link{display:inline-block;margin-top:10px;color:var(--orange);font-weight:800;font-size:.85rem}
.link:hover{color:var(--navy)}

/* ---------- Tables (product params) ---------- */
table.params{width:100%;border-collapse:collapse;margin:12px 0;font-size:.84rem}
table.params th,table.params td{padding:9px 12px;border:1px solid var(--line);text-align:left;vertical-align:top}
table.params th{background:#eef3f9;color:var(--navy);font-weight:800;white-space:nowrap;min-width:150px}
table.params td{background:#fff}
table.params tr:nth-child(even) td{background:#f8fafc}
.param-note{font-size:.8rem;color:var(--muted);margin-top:-4px}

/* ---------- CTA section ---------- */
.cta-sec{background:linear-gradient(135deg,#0d1b2e,#1b4a78);color:#fff;text-align:center;padding:64px 0}
.cta-sec h2{color:#fff;font-size:1.7rem}
.cta-sec p{color:#c4d6ea;max-width:640px;margin:12px auto 0;font-size:.96rem}
.cta-sec .btn{margin-top:26px}

/* ---------- Contact / forms ---------- */
.cta-trio{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:34px 0}
.cta-card{border:2px solid var(--line);border-radius:6px;background:#fff;padding:26px 22px;cursor:pointer;transition:border-color .2s,box-shadow .2s;position:relative}
.cta-card:hover{border-color:#9db8d6}
.cta-card.sel{border-color:var(--orange);box-shadow:0 8px 24px rgba(232,134,46,.14)}
.cta-card .sel-mark{display:none;position:absolute;top:12px;right:14px;font-size:.66rem;font-weight:800;color:var(--orange);letter-spacing:1px;text-transform:uppercase}
.cta-card.sel .sel-mark{display:inline}
.cta-card h3{font-size:1rem;margin-top:12px}
.cta-card p{font-size:.84rem;color:var(--muted);margin-top:6px}
.contact-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:30px;align-items:start}
.form-box{background:#fff;border:1px solid var(--line);border-radius:6px;padding:32px 30px}
.form-ok{display:none;background:#e8f7ee;border:1px solid #bfe6cd;color:#1c7a3d;padding:14px 16px;border-radius:5px;margin-bottom:20px;font-size:.9rem}
.form-ok.show{display:block}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.f-field{margin-bottom:16px}
.f-field label{display:block;font-size:.8rem;font-weight:800;color:var(--navy);margin-bottom:6px}
.f-field input,.f-field select,.f-field textarea{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:4px;font-size:.9rem;font-family:inherit;background:#fbfcfd;transition:border-color .2s}
.f-field input:focus,.f-field select:focus,.f-field textarea:focus{outline:none;border-color:var(--orange);background:#fff}
.f-field textarea{min-height:120px;resize:vertical}
.info-card{background:#fff;border:1px solid var(--line);border-radius:6px;padding:24px 22px}
.info-card h3{font-size:1rem;margin-bottom:14px}
.info-card .row{display:flex;gap:10px;align-items:flex-start;padding:8px 0;color:var(--steel);font-size:.88rem}
.info-card .row svg{flex-shrink:0;margin-top:3px;color:var(--orange)}

/* ---------- Timeline (about) ---------- */
.timeline{position:relative;margin:36px 0 0;padding-left:26px}
.timeline::before{content:'';position:absolute;left:6px;top:4px;bottom:4px;width:2px;background:var(--line)}
.tl-item{position:relative;padding:0 0 26px 18px}
.tl-item::before{content:'';position:absolute;left:-26px;top:6px;width:12px;height:12px;background:var(--orange);border:3px solid #fff;border-radius:50%;box-shadow:0 0 0 2px var(--orange)}
.tl-item .yr{font-size:.72rem;font-weight:900;color:var(--orange);letter-spacing:1.5px}
.tl-item h3{font-size:1rem;margin:3px 0 4px}
.tl-item p{font-size:.88rem;color:var(--muted)}

/* ---------- Case cards ---------- */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.c-card{border:1px solid var(--line);background:#fff;border-radius:6px;overflow:hidden;display:flex;flex-direction:column}
.c-card .bg{height:170px;background-size:cover;background-position:center}
.c-card .ct{padding:20px 22px;flex:1;display:flex;flex-direction:column}
.c-card .tag{font-size:.68rem;font-weight:800;letter-spacing:1.5px;text-transform:uppercase;color:var(--orange)}
.c-card h3{font-size:1.02rem;margin:6px 0 8px}
.c-card p{font-size:.86rem;color:var(--muted);flex:1}
.c-card .result{margin-top:10px;font-size:.82rem;color:var(--navy);font-weight:700}

/* ---------- Article pages ---------- */
.article{max-width:820px;margin:0 auto}
.article h2{font-size:1.4rem;margin:36px 0 12px;padding-bottom:8px;border-bottom:2px solid var(--line)}
.article h3{font-size:1.1rem;margin:24px 0 8px;color:var(--navy)}
.article p{color:#37424f;margin-bottom:14px;font-size:.97rem}
.article ul,.article ol{margin:0 0 16px 22px;color:#37424f;font-size:.95rem}
.article li{margin-bottom:6px}
.article table.params{margin:18px 0}
.article .note{background:#f0f6fc;border-left:4px solid var(--orange);padding:14px 18px;border-radius:0 5px 5px 0;margin:18px 0;font-size:.9rem;color:#37424f}
.article .kicker{font-size:.72rem;font-weight:900;letter-spacing:2.5px;text-transform:uppercase;color:var(--orange)}
.article h1{font-size:1.9rem;margin:8px 0 10px}
.article .meta{font-size:.8rem;color:var(--muted);margin-bottom:26px}

/* ---------- Footer ---------- */
footer{background:#060d18;color:rgba(255,255,255,.55);padding:48px 0 26px;font-size:.84rem}
.f-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:30px;margin-bottom:30px}
.f-grid h4{color:#fff;font-size:.88rem;margin-bottom:12px;letter-spacing:.5px}
.f-grid a{display:block;color:rgba(255,255,255,.6);padding:4px 0;font-size:.82rem}
.f-grid a:hover{color:var(--orange)}
.f-grid p{font-size:.82rem;margin-bottom:6px}
.f-meta{border-top:1px solid rgba(255,255,255,.1);padding-top:16px;margin-top:14px;font-size:.74rem;color:rgba(255,255,255,.4)}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .g3,.g4{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .f-grid{grid-template-columns:1fr 1fr}
  .split,.contact-grid{grid-template-columns:1fr}
  .cta-trio{grid-template-columns:1fr}
  .stat-row{grid-template-columns:repeat(3,1fr)}
  .t-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:1.9rem}
  .menu{display:none;position:absolute;top:76px;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;padding:16px 24px 22px;gap:4px;box-shadow:0 14px 30px rgba(13,27,46,.15);border-top:1px solid var(--line)}
  .menu.open{display:flex}
  .menu a{padding:9px 0;width:100%}
  .burger{display:flex}
  .dropdown{width:100%}
  .dropdown:hover .drop-menu,.dropdown:focus-within .drop-menu{display:none}
  .dropdown.open .drop-menu{display:block;position:static;box-shadow:none;border:none;padding:0 0 6px 14px;min-width:0}
  .drop-menu a{padding:7px 0}
}
@media(max-width:620px){
  .g2,.g3,.g4{grid-template-columns:1fr}
  .case-grid{grid-template-columns:1fr}
  .stat-row{grid-template-columns:repeat(2,1fr)}
  .form-row{grid-template-columns:1fr}
  .f-grid{grid-template-columns:1fr}
}