/* =====================================================================
   common.css — Xinhai Mineral Processing EPC · global layer
   Brand: deep navy (#143A7B) + signal red (#C8161C), industrial/engineered
   Edit shared things here (topbar / nav / footer / buttons / tokens / 版心)
   ===================================================================== */

/* ===== 1. Design tokens ===== */
:root{
  --blue:#143A7B;        /* primary brand navy */
  --blue-deep:#0E2A5C;   /* darker navy for depth */
  --blue-700:#1C4C9C;
  --red:#C8161C;         /* signal red accent */
  --red-deep:#A2101A;
  --ink:#16202E;         /* near-black text */
  --body:#3C4858;        /* body grey */
  --mid:#6B7686;         /* muted */
  --line:#E2E7EE;        /* borders */
  --bg:#FFFFFF;
  --bg-soft:#F4F6FA;     /* soft panel */
  --bg-steel:#EAEEF4;    /* steel panel */
  --footer:#0C1B33;      /* footer navy */
  --footer-2:#0A1629;
  --gold:#E8A12C;        /* subtle "ore" accent for stats */
  --max:1280px;          /* 版心 — single switch for the whole site */
  --r:4px;               /* industrial = small radii, not pillowy */
  --ease:cubic-bezier(.4,0,.2,1);
  --shadow:0 10px 30px rgba(16,32,60,.10);
  --shadow-lg:0 24px 60px rgba(16,32,60,.16);
}

/* ===== 2. Reset / base ===== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Barlow","Public Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  color:var(--body);background:var(--bg);line-height:1.7;font-size:16px;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .2s var(--ease)}
ul{list-style:none}
h1,h2,h3,h4{font-family:"Saira Condensed","Barlow Semi Condensed","Barlow",sans-serif;color:var(--ink);line-height:1.08;font-weight:700;letter-spacing:.2px}
strong{color:var(--ink)}
::selection{background:var(--blue);color:#fff}

/* ===== 3. Container (版心) ===== */
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 28px}

/* ===== 4. Section helpers ===== */
.section{padding:96px 0}
.section--soft{background:var(--bg-soft)}
.section--steel{background:var(--bg-steel)}
.section--dark{background:var(--footer);color:#C7D2E4}
.section-head{max-width:760px;margin:0 0 52px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font:700 13px/1 "Barlow",sans-serif;letter-spacing:.16em;text-transform:uppercase;
  color:var(--red);margin-bottom:16px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--red)}
.center .eyebrow::after{content:"";width:26px;height:2px;background:var(--red)}
.section-title{font-size:clamp(30px,3.6vw,46px);color:var(--ink);letter-spacing:.3px}
.section-title .hl{color:var(--blue)}
.section-sub{margin-top:18px;font-size:17px;color:var(--mid);line-height:1.75}

/* ===== 5. Buttons ===== */
.btn{
  --bg:var(--red);--fg:#fff;
  display:inline-flex;align-items:center;gap:10px;
  padding:15px 30px;background:var(--bg);color:var(--fg);
  font:700 14px/1 "Barlow",sans-serif;letter-spacing:.06em;text-transform:uppercase;
  border:2px solid var(--bg);border-radius:var(--r);cursor:pointer;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s,color .25s,border-color .25s;
}
.btn svg{width:16px;height:16px}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(200,22,28,.32)}
.btn--blue{--bg:var(--blue);box-shadow:none}
.btn--blue:hover{box-shadow:0 10px 24px rgba(20,58,123,.32)}
.btn--ghost{--bg:transparent;--fg:#fff;border-color:rgba(255,255,255,.55)}
.btn--ghost:hover{background:#fff;color:var(--blue);border-color:#fff;box-shadow:none}
.btn--outline{--bg:transparent;--fg:var(--blue);border-color:var(--blue)}
.btn--outline:hover{background:var(--blue);color:#fff}
.btn--lg{padding:18px 38px;font-size:15px}

/* ===== 6. Reveal animation ===== */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.visible{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}.reveal.d5{transition-delay:.4s}

/* ===== 7. Top bar ===== */
.topbar{background:var(--blue-deep);color:#AFC0DD;font-size:13.5px}
.topbar .container{display:flex;align-items:center;justify-content:space-between;height:42px}
.topbar a{color:#C7D5EC}
.topbar a:hover{color:#fff}
.topbar-left{display:flex;gap:26px;align-items:center}
.topbar-left .ti{display:flex;align-items:center;gap:7px}
.topbar-left svg{width:14px;height:14px;color:var(--red);flex:none}
.topbar-right{display:flex;gap:14px;align-items:center}
.topbar-social{display:flex;gap:10px}
.topbar-social a{width:24px;height:24px;border:1px solid rgba(255,255,255,.18);border-radius:3px;display:grid;place-items:center}
.topbar-social a:hover{background:var(--red);border-color:var(--red)}
.topbar-social svg{width:12px;height:12px}

/* ===== 8. Header / nav ===== */
.header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 1px 0 rgba(16,32,60,.04)}
.header.scrolled{box-shadow:0 6px 22px rgba(16,32,60,.10)}
.nav{display:flex;align-items:center;justify-content:space-between;height:84px}
.nav-logo img{height:50px;width:auto}
.nav-menu{display:flex;align-items:center;gap:4px;height:100%}
.nav-menu>li{position:relative;height:100%;display:flex;align-items:center}
.nav-link{
  display:flex;align-items:center;gap:6px;height:100%;padding:0 17px;
  font:600 15px/1 "Barlow",sans-serif;color:var(--ink);letter-spacing:.01em;position:relative;
}
.nav-link .caret{width:10px;height:10px;transition:transform .25s}
.nav-menu>li>.nav-link::after{content:"";position:absolute;left:17px;right:17px;bottom:24px;height:2px;background:var(--red);transform:scaleX(0);transform-origin:left;transition:transform .28s var(--ease)}
.nav-menu>li:hover>.nav-link::after,.nav-menu>li.active>.nav-link::after{transform:scaleX(1)}
.nav-menu>li:hover>.nav-link{color:var(--blue)}
.nav-menu>li:hover .caret{transform:rotate(180deg)}
/* dropdown */
.dropdown{
  position:absolute;top:100%;left:0;min-width:280px;background:#fff;
  border:1px solid var(--line);border-top:3px solid var(--red);box-shadow:var(--shadow);
  padding:10px;opacity:0;visibility:hidden;transform:translateY(10px);
  transition:all .26s var(--ease);border-radius:0 0 var(--r) var(--r);
}
.nav-menu>li:hover .dropdown{opacity:1;visibility:visible;transform:none}
.dropdown a{display:flex;align-items:center;gap:10px;padding:11px 14px;font-size:14.5px;font-weight:500;color:var(--body);border-radius:3px}
.dropdown a::before{content:"";width:6px;height:6px;background:var(--line);transform:rotate(45deg);transition:background .2s}
.dropdown a:hover{background:var(--bg-soft);color:var(--blue)}
.dropdown a:hover::before{background:var(--red)}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-tel{display:flex;align-items:center;gap:11px}
.nav-tel .ic{width:42px;height:42px;border-radius:50%;background:var(--bg-soft);display:grid;place-items:center;color:var(--blue)}
.nav-tel .ic svg{width:19px;height:19px}
.nav-tel .t{font-size:12px;color:var(--mid);line-height:1.3}
.nav-tel .n{font:700 16px/1.2 "Barlow",sans-serif;color:var(--ink)}
.hamburger{display:none;width:46px;height:46px;border:1px solid var(--line);background:#fff;border-radius:var(--r);cursor:pointer;flex-direction:column;gap:5px;align-items:center;justify-content:center}
.hamburger span{width:22px;height:2px;background:var(--ink);transition:.3s}

/* mobile menu */
.mobile-menu{position:fixed;inset:0 0 0 auto;width:min(360px,86vw);background:#fff;z-index:120;transform:translateX(100%);transition:transform .35s var(--ease);box-shadow:var(--shadow-lg);overflow-y:auto;padding:24px}
.mobile-menu.open{transform:none}
.mobile-menu .mm-head{display:flex;justify-content:space-between;align-items:center;padding-bottom:18px;border-bottom:1px solid var(--line);margin-bottom:14px}
.mobile-menu .mm-head img{height:40px}
.mm-close{width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:var(--r);font-size:22px;cursor:pointer;color:var(--ink)}
.mobile-link{display:block;padding:14px 6px;font:600 16px "Barlow",sans-serif;color:var(--ink);border-bottom:1px solid var(--line)}
.mobile-link:hover{color:var(--blue)}
.mobile-sub a{display:block;padding:10px 6px 10px 22px;font-size:14.5px;color:var(--body)}
.menu-backdrop{position:fixed;inset:0;background:rgba(8,16,32,.5);z-index:110;opacity:0;visibility:hidden;transition:.3s}
.menu-backdrop.open{opacity:1;visibility:visible}

/* ===== 9. Page banner (inner pages) ===== */
.page-banner{position:relative;padding:118px 0 88px;background:var(--blue-deep);color:#fff;overflow:hidden}
.page-banner::before{content:"";position:absolute;inset:0;background:linear-gradient(115deg,rgba(12,27,51,.93),rgba(12,27,51,.62));z-index:1}
.page-banner .bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.04)}
.page-banner .container{position:relative;z-index:2}
.page-banner .crumb{display:flex;gap:9px;align-items:center;font-size:13.5px;color:#9DB2D6;margin-bottom:16px;letter-spacing:.04em}
.page-banner .crumb a:hover{color:#fff}
.page-banner .crumb .sep{opacity:.5}
.page-banner h1{font-size:clamp(34px,4.6vw,58px);color:#fff;letter-spacing:.4px}
.page-banner p{margin-top:14px;max-width:640px;color:#C7D5EC;font-size:17px}
.page-banner .accent{width:64px;height:4px;background:var(--red);margin-top:22px}

/* ===== 10. Footer ===== */
.footer{background:var(--footer);color:#94A6C4;font-size:14.5px}
.footer a:hover{color:#fff}
.footer-top{padding:74px 0 54px;display:grid;grid-template-columns:1.6fr 1fr 1fr 1.4fr;gap:44px}
.footer .f-logo{height:46px;margin-bottom:20px;filter:brightness(0) invert(1);opacity:.95}
.f-wordmark{font:800 30px/1 "Saira Condensed",sans-serif;color:#fff;letter-spacing:1px;margin-bottom:8px}
.f-wordmark span{color:var(--red)}
.f-tag{font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:#7C90B2;margin-bottom:18px}
.footer .f-desc{line-height:1.8;color:#93A5C3;max-width:360px}
.footer h4{color:#fff;font-size:18px;margin-bottom:22px;letter-spacing:.5px;position:relative;padding-bottom:12px}
.footer h4::after{content:"";position:absolute;left:0;bottom:0;width:34px;height:2px;background:var(--red)}
.footer-links li{margin-bottom:12px}
.footer-links a{display:inline-flex;align-items:center;gap:9px;color:#9CAFCD}
.footer-links a::before{content:"›";color:var(--red);font-size:16px;line-height:1}
.f-contact li{display:flex;gap:13px;margin-bottom:16px;align-items:flex-start}
.f-contact .ic{width:34px;height:34px;background:rgba(255,255,255,.06);border-radius:var(--r);display:grid;place-items:center;flex:none;color:var(--red)}
.f-contact .ic svg{width:16px;height:16px}
.f-contact .tx{color:#A9BAD6;line-height:1.55}
.f-contact .tx b{display:block;color:#fff;font-weight:600;font-size:13px;margin-bottom:1px;font-family:"Barlow"}
.f-social{display:flex;gap:10px;margin-top:8px}
.f-social a{width:38px;height:38px;border:1px solid rgba(255,255,255,.14);border-radius:var(--r);display:grid;place-items:center;color:#A9BAD6}
.f-social a:hover{background:var(--red);border-color:var(--red);color:#fff}
.f-social svg{width:16px;height:16px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.09);padding:22px 0;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13.5px;color:#7C90B2}
.footer-bottom a{color:#93A5C3}

/* back to top */
.totop{position:fixed;right:26px;bottom:26px;width:50px;height:50px;background:var(--blue);color:#fff;border:none;border-radius:var(--r);cursor:pointer;display:grid;place-items:center;opacity:0;visibility:hidden;transform:translateY(14px);transition:.3s;z-index:60;box-shadow:var(--shadow)}
.totop.show{opacity:1;visibility:visible;transform:none}
.totop:hover{background:var(--red)}
.totop svg{width:20px;height:20px}

/* ===== 10b. Shared content components (used on multiple pages) ===== */

/* breadcrumb-style intro grid helpers */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}

/* PRODUCT card */
.prod-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:transform .3s var(--ease),box-shadow .3s,border-color .3s;display:flex;flex-direction:column}
.prod-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.prod-thumb{position:relative;aspect-ratio:16/11;overflow:hidden;background:var(--bg-soft)}
.prod-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.prod-card:hover .prod-thumb img{transform:scale(1.07)}
.prod-cat{position:absolute;top:14px;left:14px;background:var(--blue);color:#fff;font:700 11px/1 "Barlow",sans-serif;letter-spacing:.1em;text-transform:uppercase;padding:7px 12px;border-radius:3px}
.prod-body{padding:24px 24px 26px;flex:1;display:flex;flex-direction:column}
.prod-body h3{font-size:21px;margin-bottom:10px;color:var(--ink)}
.prod-body p{font-size:14.5px;color:var(--mid);line-height:1.65;flex:1}
.prod-spec{display:flex;gap:18px;margin:16px 0 18px;padding-top:16px;border-top:1px solid var(--line)}
.prod-spec .s b{display:block;font:700 17px/1 "Saira Condensed",sans-serif;color:var(--blue)}
.prod-spec .s span{font-size:12px;color:var(--mid)}
.prod-more{display:inline-flex;align-items:center;gap:8px;font:700 13px/1 "Barlow",sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--red)}
.prod-more svg{width:15px;height:15px;transition:transform .25s}
.prod-card:hover .prod-more svg{transform:translateX(4px)}

/* APPLICATION card */
.app-card{position:relative;border-radius:var(--r);overflow:hidden;aspect-ratio:4/3;cursor:pointer;display:block}
.app-card img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.app-card:hover img{transform:scale(1.08)}
.app-card::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(10,22,41,.92) 0%,rgba(10,22,41,.25) 55%,transparent 100%)}
.app-card .ac{position:absolute;z-index:2;left:0;right:0;bottom:0;padding:26px 24px;color:#fff}
.app-card .ac .cat{font:700 11px/1 "Barlow",sans-serif;letter-spacing:.14em;text-transform:uppercase;color:#7FB0FF;margin-bottom:8px}
.app-card .ac h3{color:#fff;font-size:23px;margin-bottom:6px}
.app-card .ac p{font-size:13.5px;color:#C2D1EA;max-height:0;opacity:0;overflow:hidden;transition:.4s var(--ease)}
.app-card:hover .ac p{max-height:90px;opacity:1;margin-top:6px}

/* CASE card */
.case-card{display:flex;background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:.3s}
.case-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.case-card .ci{width:42%;flex:none;overflow:hidden;position:relative}
.case-card .ci img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.case-card:hover .ci img{transform:scale(1.07)}
.case-card .flag{position:absolute;top:12px;left:12px;background:var(--red);color:#fff;font:700 11px/1 "Barlow",sans-serif;letter-spacing:.08em;padding:6px 10px;border-radius:3px;text-transform:uppercase}
.case-card .cb{padding:26px;display:flex;flex-direction:column}
.case-card .cb .tpd{font:700 13px/1 "Saira Condensed",sans-serif;color:var(--red);letter-spacing:.06em;margin-bottom:8px;text-transform:uppercase}
.case-card .cb h3{font-size:21px;margin-bottom:10px;color:var(--ink);line-height:1.15}
.case-card .cb p{font-size:14px;color:var(--mid);line-height:1.6;flex:1}
.case-card .cb .more{margin-top:14px;font:700 12.5px/1 "Barlow",sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);display:inline-flex;gap:7px;align-items:center}

/* BLOG card */
.blog-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:.3s;display:flex;flex-direction:column}
.blog-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-6px);border-color:transparent}
.blog-thumb{aspect-ratio:16/10;overflow:hidden;display:block}
.blog-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.blog-card:hover .blog-thumb img{transform:scale(1.07)}
.blog-body{padding:24px;flex:1;display:flex;flex-direction:column}
.blog-meta{display:flex;gap:14px;font-size:12.5px;color:var(--mid);margin-bottom:12px;letter-spacing:.02em}
.blog-meta .tag{color:var(--red);font-weight:700;text-transform:uppercase;letter-spacing:.08em}
.blog-body h3{font-size:19px;line-height:1.25;margin-bottom:10px;color:var(--ink)}
.blog-body p{font-size:14px;color:var(--mid);line-height:1.6;flex:1}
.blog-body .more{margin-top:14px;font:700 12.5px/1 "Barlow",sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);display:inline-flex;gap:7px;align-items:center}

/* INQUIRY form (shared) */
.cta-form{background:#fff;border-radius:var(--r);padding:38px;box-shadow:var(--shadow-lg)}
.cta-form h3{color:var(--ink);font-size:24px;margin-bottom:6px}
.cta-form .fsub{color:var(--mid);font-size:14px;margin-bottom:22px}
.cta-form .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.cta-form input,.cta-form textarea,.cta-form select{width:100%;padding:13px 15px;border:1px solid var(--line);border-radius:var(--r);font:500 14.5px "Barlow",sans-serif;color:var(--ink);margin-bottom:14px;background:var(--bg-soft);transition:.2s}
.cta-form input:focus,.cta-form textarea:focus,.cta-form select:focus{outline:none;border-color:var(--blue);background:#fff}
.cta-form textarea{resize:vertical;min-height:96px}
.cta-form .btn{width:100%;justify-content:center}

/* prose (detail/article body) */
.prose{font-size:16.5px;color:var(--body);line-height:1.85}
.prose h2{font-size:28px;color:var(--ink);margin:38px 0 16px}
.prose h3{font-size:22px;color:var(--ink);margin:30px 0 12px}
.prose p{margin-bottom:18px}
.prose ul{margin:0 0 20px;padding-left:4px}
.prose ul li{position:relative;padding:6px 0 6px 26px}
.prose ul li::before{content:"";position:absolute;left:0;top:14px;width:7px;height:7px;background:var(--red);transform:rotate(45deg)}
.prose blockquote{border-left:4px solid var(--blue);background:var(--bg-soft);padding:20px 26px;margin:24px 0;font-style:italic;color:var(--ink)}
.prose table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px}
.prose th{background:var(--blue);color:#fff;text-align:left;padding:13px 16px;font-family:"Barlow",sans-serif;font-weight:600}
.prose td{padding:12px 16px;border:1px solid var(--line)}
.prose tr:nth-child(even) td{background:var(--bg-soft)}
.prose img{border-radius:var(--r);margin:24px 0}

/* responsive for shared components */
@media(max-width:980px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-2{grid-template-columns:1fr}
}
@media(max-width:640px){
  .grid-3,.grid-4{grid-template-columns:1fr}
  .case-card{flex-direction:column}.case-card .ci{width:100%;aspect-ratio:16/10}
  .cta-form .row{grid-template-columns:1fr}
}

/* ===== 11. Shared responsive (header/footer/版心) ===== */
@media(max-width:1080px){
  .nav-menu,.nav-tel,.topbar-left .ti.hide-md{display:none}
  .hamburger{display:flex}
  .footer-top{grid-template-columns:1fr 1fr;gap:36px}
}
@media(max-width:640px){
  .section{padding:64px 0}
  .container{padding:0 20px}
  .topbar-left{gap:16px}
  .footer-top{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
}