/* ============================================
   荣华特种橡胶官网 — 简洁工业白设计系统
   ============================================ */
:root{
  --bg:#FAFAF8;
  --surface:#FFFFFF;
  --ink:#1A1D21;
  --ink2:#5A6068;
  --accent:#1E3A52;
  --accent-soft:#EDF1F5;
  --cta:#C8501E;
  --line:#E5E3DE;
  --radius:6px;
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"PingFang SC","Noto Sans SC","Microsoft YaHei",-apple-system,sans-serif;
  background:var(--bg);color:var(--ink);
  line-height:1.7;font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--accent);color:rgba(255,255,255,.85);font-size:12.5px;}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:34px;}
.topbar a:hover{color:#fff;}

/* ---------- 导航 ---------- */
header.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);transition:box-shadow .3s;}
header.nav.scrolled{box-shadow:0 4px 24px rgba(26,29,33,.08);}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px;}
.brand{display:flex;align-items:center;gap:12px;}
.brand-logo{width:46px;height:46px;object-fit:contain;background:#fff;border-radius:6px;border:1px solid var(--line);padding:3px;}
.brand-name{font-size:17px;font-weight:700;line-height:1.3;}
.brand-sub{font-size:11px;color:var(--ink2);letter-spacing:.5px;}
nav.main{display:flex;gap:34px;}
nav.main a{font-size:15px;color:var(--ink2);position:relative;padding:6px 0;transition:color .2s;}
nav.main a:hover,nav.main a.active{color:var(--ink);}
nav.main a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--cta);transition:width .25s;}
nav.main a:hover::after,nav.main a.active::after{width:100%;}
.nav-tel{display:flex;align-items:center;gap:8px;color:var(--accent);font-weight:700;font-size:16px;white-space:nowrap;}
.nav-tel svg{width:18px;height:18px;}

/* ---------- Hero ---------- */
.hero{position:relative;height:88vh;min-height:560px;overflow:hidden;background:#DDE3E9;}
.hero-slide{position:absolute;inset:0;opacity:0;transition:opacity 1.1s ease;z-index:1;}
.hero-slide.active{opacity:1;z-index:2;}
.hero-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;animation:kenburns 18s ease-in-out infinite alternate;}
@keyframes kenburns{from{transform:scale(1);}to{transform:scale(1.08);}}
.hero-slide::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(250,250,248,.92) 0%,rgba(250,250,248,.5) 32%,rgba(250,250,248,0) 58%);}
.hero-content{position:relative;z-index:3;height:100%;display:flex;flex-direction:column;justify-content:flex-start;align-items:flex-start;max-width:none;width:100%;margin:0;padding:56px 6vw 0;}
.hero-copy{max-width:560px;opacity:0;transform:translateY(24px);transition:opacity .8s ease .15s,transform .8s ease .15s;}
.hero-slide.active .hero-copy{opacity:1;transform:none;}
.hero h1{font-size:clamp(28px,3.6vw,46px);font-weight:700;line-height:1.28;letter-spacing:-.4px;color:var(--ink);}
.hero h1 em{font-style:normal;color:var(--accent);}
.hero p{margin:16px 0 28px;font-size:15.5px;color:var(--ink2);max-width:480px;}
.hero-kicker{display:inline-flex;align-items:center;gap:10px;color:var(--cta);font-size:13px;font-weight:600;letter-spacing:3px;text-transform:uppercase;margin-bottom:14px;}
.hero-kicker::before{content:"";width:36px;height:2px;background:var(--cta);}
.hero-actions .btn{padding:13px 30px;font-size:15px;}
/* 轮播指示点 */
.hero-dots{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);z-index:5;display:flex;gap:10px;}
.hero-dots button{width:34px;height:4px;border:none;border-radius:2px;background:rgba(26,29,33,.22);cursor:pointer;transition:all .3s;padding:0;}
.hero-dots button.on{background:var(--cta);width:52px;}
/* 左右箭头 */
.hero-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:5;width:44px;height:44px;border:none;border-radius:50%;background:rgba(255,255,255,.7);backdrop-filter:blur(4px);color:var(--ink);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .25s;opacity:0;}
.hero:hover .hero-arrow{opacity:1;}
.hero-arrow:hover{background:#fff;box-shadow:0 6px 18px rgba(26,29,33,.18);}
.hero-arrow svg{width:20px;height:20px;}
.hero-arrow.prev{left:26px;}
.hero-arrow.next{right:26px;}
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 32px;border-radius:var(--radius);font-size:15px;font-weight:600;transition:all .25s;cursor:pointer;border:none;}
.btn-primary{background:var(--cta);color:#fff;}
.btn-primary:hover{background:#A84215;transform:translateY(-2px);box-shadow:0 10px 24px rgba(200,80,30,.28);}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--ink);}
.btn-ghost:hover{background:var(--ink);color:#fff;}
.hero-actions{display:flex;gap:16px;}

/* ---------- 数据带 ---------- */
.stats{background:var(--accent);color:#fff;}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);}
.stat{padding:44px 20px;text-align:center;border-right:1px solid rgba(255,255,255,.14);}
.stat:last-child{border-right:none;}
.stat-num{font-size:42px;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.1;}
.stat-num span{font-size:20px;font-weight:600;margin-left:2px;}
.stat-label{font-size:13.5px;color:rgba(255,255,255,.72);margin-top:8px;letter-spacing:1px;}

/* ---------- 板块标题 ---------- */
section.block{padding:104px 0;}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:52px;gap:24px;flex-wrap:wrap;}
.sec-eyebrow{color:var(--cta);font-size:13px;font-weight:600;letter-spacing:3px;text-transform:uppercase;margin-bottom:10px;display:flex;align-items:center;gap:10px;}
.sec-eyebrow::before{content:"";width:28px;height:2px;background:var(--cta);}
.sec-title{font-size:clamp(26px,3vw,36px);font-weight:700;line-height:1.3;}
.sec-more{color:var(--ink2);font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:6px;white-space:nowrap;border-bottom:1px solid var(--line);padding-bottom:4px;transition:all .2s;}
.sec-more:hover{color:var(--cta);border-color:var(--cta);}

/* ---------- 产品网格 ---------- */
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.prod-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:all .3s;cursor:pointer;}
.prod-card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(30,58,82,.12);border-color:transparent;}
.prod-img{aspect-ratio:4/3;overflow:hidden;background:var(--accent-soft);}
.prod-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}
.prod-card:hover .prod-img img{transform:scale(1.06);}
.prod-info{padding:18px 20px;}
.prod-tag{font-size:11px;color:var(--cta);letter-spacing:1.5px;text-transform:uppercase;font-weight:600;}
.prod-name{font-size:16.5px;font-weight:600;margin-top:5px;}
.prod-desc{font-size:13px;color:var(--ink2);margin-top:5px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}

/* ---------- 优势 ---------- */
.adv{background:var(--surface);}
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--bg);}
.adv-item{padding:40px 30px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface);transition:background .3s;}
.adv-item:hover{background:var(--accent-soft);}
.adv-no{font-size:13px;color:var(--cta);font-weight:700;letter-spacing:2px;}
.adv-item h3{font-size:18px;font-weight:700;margin:14px 0 12px;}
.adv-item p{font-size:13.5px;color:var(--ink2);line-height:1.8;}

/* ---------- 定制流程 ---------- */
.flow-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px;}
.flow-step{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:30px 18px;text-align:center;transition:all .3s;}
.flow-step:hover{border-color:var(--accent);transform:translateY(-4px);}
.flow-no{width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;}
.flow-step h4{font-size:15.5px;font-weight:600;}
.flow-step p{font-size:12px;color:var(--ink2);margin-top:6px;}

/* ---------- 应用领域 ---------- */
.apps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.app-card{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/5;background:var(--accent);display:flex;align-items:flex-end;padding:26px;transition:transform .3s;}
.app-card:hover{transform:translateY(-6px);}
.app-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .6s;}
.app-card:hover .app-bg{transform:scale(1.07);}
.app-card::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(22,32,42,.05) 25%,rgba(22,32,42,.88));z-index:1;transition:background .3s;}
.app-icon{position:absolute;top:24px;left:26px;width:44px;height:44px;color:rgba(255,255,255,.9);z-index:2;}
.app-body{position:relative;z-index:2;color:#fff;}
.app-body h3{font-size:21px;font-weight:700;}
.app-body p{font-size:13px;color:rgba(255,255,255,.82);margin-top:8px;}

/* ---------- CTA 条 ---------- */
.cta-band{background:var(--accent);color:#fff;padding:76px 0;}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;}
.cta-inner h2{font-size:clamp(24px,3vw,34px);font-weight:700;line-height:1.35;}
.cta-inner h2 span{color:#E8A87C;}
.cta-inner p{color:rgba(255,255,255,.7);margin-top:10px;font-size:15px;}
.cta-phone{font-size:clamp(26px,3vw,38px);font-weight:700;letter-spacing:1px;}
.btn-white{background:#fff;color:var(--accent);}
.btn-white:hover{background:#E8A87C;color:#fff;transform:translateY(-2px);}

/* ---------- 关于摘要 ---------- */
.about-split{display:grid;grid-template-columns:1.05fr 1fr;gap:64px;align-items:center;}
.about-media{position:relative;border-radius:var(--radius);overflow:hidden;}
.about-media img{aspect-ratio:4/3;object-fit:cover;width:100%;}
.about-badge{position:absolute;right:-18px;bottom:32px;background:var(--cta);color:#fff;padding:22px 28px;border-radius:var(--radius);text-align:center;box-shadow:0 16px 40px rgba(200,80,30,.3);}
.about-badge b{display:block;font-size:34px;font-weight:700;line-height:1;}
.about-badge span{font-size:12px;letter-spacing:1px;opacity:.9;}
.about-text p{color:var(--ink2);font-size:15.5px;margin-bottom:16px;}
.about-points{margin:24px 0 30px;display:grid;gap:12px;}
.about-points li{display:flex;gap:10px;align-items:flex-start;font-size:15px;font-weight:500;}
.about-points svg{width:19px;height:19px;color:var(--cta);flex-shrink:0;margin-top:4px;}

/* ---------- 新闻 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.news-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:all .3s;display:flex;flex-direction:column;}
.news-card:hover{transform:translateY(-5px);box-shadow:0 14px 36px rgba(30,58,82,.1);}
.news-date{font-size:12.5px;color:var(--ink2);letter-spacing:1px;}
.news-card h3{font-size:17px;font-weight:600;margin:10px 0;line-height:1.5;}
.news-card p{font-size:13.5px;color:var(--ink2);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;flex:1;}
.news-card .sec-more{margin-top:18px;font-size:13px;}

/* ---------- 页脚 ---------- */
footer{background:#14181D;color:rgba(255,255,255,.65);padding:72px 0 0;}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:48px;padding-bottom:56px;}
.foot-brand .brand-name{color:#fff;}
.foot-brand p{font-size:13.5px;margin-top:18px;line-height:1.9;}
footer h4{color:#fff;font-size:15px;font-weight:600;margin-bottom:20px;letter-spacing:1px;}
footer li{margin-bottom:12px;font-size:13.5px;}
footer li a:hover{color:#fff;}
.foot-contact li{display:flex;gap:10px;align-items:flex-start;}
.foot-contact svg{width:16px;height:16px;flex-shrink:0;margin-top:5px;color:#E8A87C;}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding:22px 0;font-size:12.5px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;}

/* ---------- 详情页真实图册 ---------- */
.real-gallery{margin:48px 0 0;}
.real-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.real-item{background:var(--surface);border:1px solid var(--line);border-radius:6px;overflow:hidden;transition:all .3s;}
.real-item:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(30,58,82,.12);}
.real-item img{aspect-ratio:5/4;object-fit:cover;width:100%;background:#fff;}
.real-item figcaption{padding:10px 14px;font-size:12px;color:var(--ink2);text-align:center;letter-spacing:.5px;}
@media(max-width:1024px){.real-grid{grid-template-columns:repeat(3,1fr);}}
@media(max-width:640px){.real-grid{grid-template-columns:repeat(2,1fr);}}

/* ---------- 内页 Banner ---------- */
.page-banner{position:relative;background:#22394D;color:#fff;min-height:300px;overflow:hidden;}
.page-banner-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.92;}
.page-banner::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(24,38,50,.66) 0%,rgba(24,38,50,.28) 38%,rgba(24,38,50,0) 62%);}
.page-banner .container{position:absolute;left:4vw;right:4vw;top:38px;bottom:auto;z-index:2;max-width:none;margin:0;padding:0;}
.page-banner .crumb{font-size:12px;color:rgba(255,255,255,.85);margin-bottom:10px;letter-spacing:1px;}
.page-banner .crumb a:hover{color:#fff;}
.page-banner h1{display:inline-block;font-size:clamp(20px,2.2vw,28px);font-weight:700;position:relative;z-index:2;background:rgba(20,30,40,.42);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-radius:8px;padding:9px 18px;line-height:1.3;}
.page-banner p{display:inline-block;color:rgba(255,255,255,.95);margin-top:10px;font-size:13px;max-width:520px;position:relative;z-index:2;background:rgba(20,30,40,.36);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border-radius:6px;padding:6px 14px;text-shadow:none;}

/* ---------- 联系页 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:start;}
.contact-item{display:flex;gap:18px;padding:24px 0;border-bottom:1px solid var(--line);}
.contact-item:first-child{padding-top:0;}
.ci-icon{width:46px;height:46px;border-radius:var(--radius);background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.ci-icon svg{width:22px;height:22px;}
.contact-item h4{font-size:15px;font-weight:600;margin-bottom:4px;}
.contact-item p{font-size:14.5px;color:var(--ink2);}
.contact-form{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:40px;}
.contact-form h3{font-size:20px;font-weight:700;margin-bottom:8px;}
.contact-form>p{font-size:13.5px;color:var(--ink2);margin-bottom:26px;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.field{margin-bottom:16px;}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:7px;color:var(--ink2);}
.field label b{color:var(--cta);}
.field input,.field textarea,.field select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:4px;font-size:14.5px;font-family:inherit;background:var(--bg);transition:border .2s;color:var(--ink);}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--accent);}
.field textarea{min-height:120px;resize:vertical;}

/* ---------- 动画 ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease;}
.reveal.in{opacity:1;transform:none;}
.d1{transition-delay:.08s;}.d2{transition-delay:.16s;}.d3{transition-delay:.24s;}.d4{transition-delay:.32s;}

/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .prod-grid{grid-template-columns:repeat(3,1fr);}
  .adv-grid{grid-template-columns:repeat(2,1fr);}
  .flow-grid{grid-template-columns:repeat(3,1fr);}
  .apps-grid{grid-template-columns:repeat(2,1fr);}
  .news-grid{grid-template-columns:repeat(2,1fr);}
  .about-split{grid-template-columns:1fr;gap:44px;}
  .about-badge{right:16px;}
  .foot-grid{grid-template-columns:1fr 1fr;}
  nav.main{display:none;}
}
@media(max-width:640px){
  .prod-grid{grid-template-columns:repeat(2,1fr);}
  .adv-grid{grid-template-columns:1fr;}
  .flow-grid{grid-template-columns:repeat(2,1fr);}
  .news-grid{grid-template-columns:1fr;}
  .stats-grid{grid-template-columns:repeat(2,1fr);}
  .stat{border-bottom:1px solid rgba(255,255,255,.14);}
  .contact-grid{grid-template-columns:1fr;}
  .form-row{grid-template-columns:1fr;}
  .topbar .container span.hide-m{display:none;}
  section.block{padding:72px 0;}
  .contact-form{padding:26px;}
}