/* Unimach — 工业风混凝土设备站，无外部依赖 */
:root{
  --yellow:#F5A800;
  --yellow-dark:#D89400;
  --ink:#1A1A1A;
  --ink-soft:#2B2B2B;
  --muted:#6B7280;
  --bg:#FFFFFF;
  --bg-alt:#F4F4F2;
  --border:#E5E2DC;
  --radius:12px;
  --shadow:0 12px 32px rgba(26,26,26,.10);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:120px}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.container{max-width:1180px;margin:0 auto;padding:0 24px}
.section{padding:84px 0}
.section-alt{background:var(--bg-alt)}
.section-head{max-width:660px;margin:0 auto 48px;text-align:center}
.section-head h2{font-size:clamp(26px,4vw,36px);letter-spacing:.01em;margin:10px 0 10px}
.section-head p{color:var(--muted)}
.eyebrow{display:inline-block;font-size:12.5px;font-weight:700;color:#7A5B00;background:#FFF3D1;border:1px solid #F5D67A;padding:4px 14px;border-radius:999px;letter-spacing:.1em;text-transform:uppercase}
.muted{color:var(--muted)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;border-radius:8px;padding:11px 24px;border:2px solid transparent;cursor:pointer;transition:transform .15s ease,background .15s ease;font-size:15px}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--yellow);color:var(--ink)}
.btn-primary:hover{background:var(--yellow-dark)}
.btn-outline{border-color:rgba(255,255,255,.55);color:#fff;background:transparent}
.btn-outline:hover{border-color:#fff}
.btn-light{background:#fff;color:var(--ink)}
.btn-lg{padding:14px 34px;font-size:16px}

/* 顶栏 */
.topbar{background:var(--ink);color:#CFCFCF;font-size:13px}
.topbar-inner{display:flex;gap:26px;align-items:center;height:38px}
.topbar-item em{font-style:normal;opacity:.55}
.topbar-right{margin-left:auto;opacity:.75}

/* 页眉 */
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:3px solid var(--yellow);transition:box-shadow .2s}
.site-header.scrolled{box-shadow:0 6px 20px rgba(26,26,26,.10)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:22px;letter-spacing:.04em}
.logo em{font-style:normal;color:var(--yellow-dark)}
.main-nav{display:flex;align-items:center;gap:26px;font-size:15px;font-weight:600}
.main-nav a{color:#333;transition:color .15s}
.main-nav a:hover{color:var(--yellow-dark)}
.nav-cta{color:var(--ink) !important}
.menu-toggle{display:none;background:none;border:0;cursor:pointer;flex-direction:column;gap:5px;padding:8px}
.menu-toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:transform .2s,opacity .2s}

/* Hero */
.hero{background:linear-gradient(115deg,#1A1A1A 55%,#2b2b2b 100%);color:#fff;padding:96px 0;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(-45deg,transparent 0 26px,rgba(245,168,0,.05) 26px 40px);pointer-events:none}
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.badge{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--yellow);border:1px solid rgba(245,168,0,.5);padding:6px 16px;border-radius:999px;margin-bottom:20px}
.hero h1{font-size:clamp(34px,5vw,54px);line-height:1.2;margin-bottom:18px}
.lead{font-size:17px;color:#CFCFCF;max-width:500px;margin-bottom:30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:40px}
.hero-stats{display:flex;gap:38px}
.hero-stats dt{font-size:30px;font-weight:800;color:var(--yellow)}
.hero-stats dd{font-size:13px;color:#A9A9A9;margin:0}
.machine-card{background:#fff;border-radius:16px;padding:26px;box-shadow:var(--shadow);color:var(--ink)}
.machine-svg{width:100%;height:auto;display:block}
.machine-caption{text-align:center;font-size:13px;color:var(--muted);margin-top:8px}

/* 卡片 */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:30px 26px;box-shadow:0 2px 8px rgba(26,26,26,.05);transition:transform .18s ease,box-shadow .18s ease}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.card h3{font-size:19px;margin-bottom:10px}
.card p{font-size:14.5px;color:var(--muted)}
.card-dark{background:var(--ink);color:#fff;border-color:var(--ink)}
.card-dark p{color:#BDBDBD}
.card-kicker{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--ink);background:var(--yellow);padding:4px 12px;border-radius:6px;margin-bottom:14px}
.card-link{display:inline-block;margin-top:16px;font-weight:700;color:var(--yellow-dark)}
.card-dark .card-link{color:var(--yellow)}

/* 分类卡 */
.cat-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:26px 22px;text-align:center;transition:transform .18s ease,box-shadow .18s ease,border-color .18s}
.cat-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--yellow)}
.cat-icon{font-size:38px;display:block;margin-bottom:12px}
.cat-card h3{font-size:16.5px;margin-bottom:6px}
.cat-card p{font-size:13.5px;color:var(--muted)}

/* 促销横幅 */
.promo{background:linear-gradient(120deg,#1A1A1A,#333);color:#fff;padding:72px 0}
.promo-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.promo-tag{display:inline-block;background:var(--yellow);color:var(--ink);font-size:12.5px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;padding:5px 14px;border-radius:6px;margin-bottom:16px}
.promo-copy h2{font-size:clamp(24px,3.6vw,34px);margin-bottom:20px}
.checklist{list-style:none;margin:0 0 28px;display:grid;gap:12px}
.checklist li{position:relative;padding-left:34px;font-size:15.5px;color:#EDEDED}
.checklist li::before{content:"✓";position:absolute;left:0;top:2px;width:23px;height:23px;border-radius:50%;background:var(--yellow);color:var(--ink);font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center}
.promo-visual{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:16px;padding:24px}
.plant-svg{width:100%;height:auto;display:block}

/* 数字行 */
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat b{display:block;font-size:44px;font-weight:800;color:var(--ink)}
.stat span{font-size:14px;color:var(--muted)}

/* 配件 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.split h2{font-size:clamp(26px,4vw,36px);margin:10px 0 14px}
.parts-panel{background:var(--ink);color:#fff;border-radius:16px;padding:44px 36px;text-align:center;box-shadow:var(--shadow)}
.parts-panel .gear{font-size:64px;margin-bottom:18px;display:block;animation:spin 14s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.parts-panel p{font-size:16px;color:#D8D8D8}

/* 新闻 */
.news-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px 26px;transition:transform .18s ease,box-shadow .18s ease}
.news-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.news-date{display:inline-block;font-size:12.5px;font-weight:700;color:#7A5B00;background:#FFF3D1;padding:3px 12px;border-radius:999px;margin-bottom:14px}
.news-card h3{font-size:17.5px;margin-bottom:10px;line-height:1.45}
.news-card p{font-size:14px;color:var(--muted)}

/* CTA */
.cta{background:var(--yellow);padding:72px 0;text-align:center;color:var(--ink)}
.cta-inner h2{font-size:clamp(26px,4vw,36px);margin-bottom:10px}
.cta-inner p{margin-bottom:26px;font-weight:600}

/* 联系 */
.contact-list{list-style:none;margin-top:26px;display:grid;gap:14px}
.contact-list li{display:flex;gap:14px;font-size:15px}
.contact-list b{flex:none;width:64px}
.contact-list span{color:var(--muted)}
.contact-form{background:#fff;border:1px solid var(--border);border-radius:16px;padding:32px;box-shadow:var(--shadow);display:grid;grid-template-columns:1fr 1fr;gap:16px}
.contact-form label{display:grid;gap:8px;font-size:14px;font-weight:600}
.contact-form .full{grid-column:1/-1}
.contact-form input,.contact-form select,.contact-form textarea{font-family:var(--font);font-size:15px;border:1px solid var(--border);border-radius:8px;padding:12px 14px;width:100%;background:#FDFDFD}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:none;border-color:var(--yellow-dark);box-shadow:0 0 0 3px rgba(245,168,0,.18)}
.contact-form textarea{resize:vertical}
.form-note{grid-column:1/-1;font-size:14px;min-height:22px}
.form-note.ok{color:#15803D}
.form-note.err{color:#DC2626}

/* 页脚 */
.site-footer{background:var(--ink);color:#BDBDBD;padding:54px 0 0;font-size:14.5px}
.footer-inner{display:flex;justify-content:space-between;gap:32px;padding-bottom:34px;align-items:flex-start}
.footer-brand .logo{color:#fff;margin-bottom:10px}
.footer-brand p{max-width:300px;font-size:13.5px}
.site-footer nav{display:flex;gap:24px;flex-wrap:wrap}
.site-footer nav a:hover{color:var(--yellow)}
.footer-bottom{border-top:1px solid #333;padding:18px 0;font-size:13px;color:#8a8a8a}

/* 动画 */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .55s ease,transform .55s ease}
.reveal.visible{opacity:1;transform:none}

@media (max-width:960px){
  .hero-inner,.promo-inner,.split{grid-template-columns:1fr;gap:40px}
  .hero{padding:72px 0}
  .grid-4{grid-template-columns:1fr 1fr}
  .grid-3{grid-template-columns:1fr}
  .stats-row{grid-template-columns:1fr 1fr;gap:28px}
  .section{padding:60px 0}
}
@media (max-width:640px){
  .main-nav{position:fixed;top:110px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 20px;border-bottom:3px solid var(--yellow);box-shadow:0 12px 24px rgba(26,26,26,.12);transform:translateY(-135%);transition:transform .25s ease;z-index:99}
  .main-nav.open{transform:none}
  .main-nav a{padding:12px 0;border-bottom:1px solid var(--bg-alt)}
  .main-nav .nav-cta{margin-top:12px;text-align:center}
  .menu-toggle{display:flex}
  .menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .menu-toggle.open span:nth-child(2){opacity:0}
  .menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .grid-4{grid-template-columns:1fr}
  .contact-form{grid-template-columns:1fr;padding:24px 18px}
  .hero-stats{gap:24px;flex-wrap:wrap}
  .footer-inner{flex-direction:column}
  .topbar-right{display:none}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .parts-panel .gear{animation:none}
  html{scroll-behavior:auto}
}