/* ========== 湘赣新材料官网 · 全局样式（工业 / 制造风） ========== */
:root{
  --navy:#0f2942;
  --navy2:#17456f;
  --blue:#1d5a8c;
  --orange:#cf6a2e;
  --orange2:#e8874f;
  --ink:#1d2a36;
  --muted:#5b6b78;
  --bg:#f4f6f8;
  --card:#ffffff;
  --line:#dde4ea;
  --radius:10px;
  --shadow:0 4px 18px rgba(15,41,66,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Microsoft YaHei","PingFang SC","Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:var(--navy2);text-decoration:none}
a:hover{color:var(--orange)}
img{max-width:100%;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
h1,h2,h3,h4{line-height:1.3;color:var(--navy)}

/* ========== 顶栏 ========== */
.topbar{background:var(--navy);color:#cfe0ee;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:40px}
.topbar .tl{opacity:.9}
.topbar a{color:#fff}
.brand{display:inline-flex;flex-direction:row;gap:12px;align-items:center;white-space:nowrap;writing-mode:horizontal-tb}
.brand .bname{color:#fff;font-size:21px;font-weight:800;letter-spacing:.04em;white-space:nowrap;writing-mode:horizontal-tb;display:inline-block}
.brand .ben{color:#9fb6cc;font-size:12px;letter-spacing:.12em;text-transform:uppercase;white-space:nowrap;writing-mode:horizontal-tb;display:inline-block}
header.main{background:var(--navy2);color:#fff;position:sticky;top:0;z-index:100;box-shadow:0 2px 10px rgba(0,0,0,.18)}
nav.main .wrap{display:flex;flex-direction:row;align-items:center;justify-content:center;min-height:70px;gap:40px}
nav.main .brand{flex:0 0 auto}
nav.main ul{list-style:none;display:flex;flex-direction:row;flex-wrap:nowrap;gap:4px;margin:0;padding:0;writing-mode:horizontal-tb;flex:0 0 auto}
nav.main ul li{display:inline-flex;flex:0 0 auto;margin:0;padding:0;float:none;writing-mode:horizontal-tb}
nav.main li a{display:inline-block;color:#e8f0f7;padding:24px 16px;font-size:16px;position:relative;transition:.2s;white-space:nowrap;writing-mode:horizontal-tb;text-orientation:mixed}
nav.main li a:hover,nav.main li a.active{color:#fff}
nav.main li a.active::after{content:"";position:absolute;bottom:16px;left:16px;right:16px;height:3px;background:var(--orange2);border-radius:3px}
nav.main .cta{margin-left:auto;background:var(--orange);color:#fff;padding:11px 22px;border-radius:6px;font-weight:700;transition:.2s;white-space:nowrap;writing-mode:horizontal-tb;display:inline-block}
nav.main .cta:hover{background:var(--orange2);color:#fff}
.hamb{display:none;background:none;border:0;color:#fff;font-size:24px;cursor:pointer}

@media(max-width:920px){
  nav.main .wrap{flex-wrap:wrap;justify-content:space-between;gap:10px}
  nav.main .brand{order:1;flex:0 0 auto}
  nav.main ul{order:3;width:100%;flex-direction:row;flex-wrap:wrap;gap:2px 10px;display:none;padding:10px 0;writing-mode:horizontal-tb;justify-content:flex-start}
  nav.main ul.open{display:flex}
  nav.main ul li{display:inline-flex;flex:0 0 auto}
  nav.main li a{padding:10px 12px;border-bottom:1px solid rgba(255,255,255,.08);white-space:nowrap;writing-mode:horizontal-tb}
  .hamb{display:block;order:2;flex:0 0 auto}
  nav.main .cta{display:none}
  nav.main li a.active::after{display:none}
}

/* ========== Hero（大图） ========== */
.hero{position:relative;min-height:50vh;display:flex;align-items:center;color:#fff;background:var(--navy)}
.hero.carousel{min-height:50vh}
.hero.carousel .slide{min-height:50vh}
.hero img.bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(15,41,66,.88) 0%,rgba(15,41,66,.55) 55%,rgba(15,41,66,.15) 100%)}
.hero .wrap{position:relative;z-index:2;text-align:center}
.hero h1{color:#fff;font-size:52px;margin:8px auto 16px;max-width:820px;letter-spacing:.01em;text-align:center}
.hero .kicker{color:var(--orange2);font-weight:700;letter-spacing:.22em;text-transform:uppercase;font-size:14px;text-align:center}
.hero p.sub{color:#e6eef6;font-size:19px;max-width:640px;margin:0 auto 28px;text-align:center}
.btn{display:inline-block;background:var(--orange);color:#fff;padding:14px 32px;border-radius:8px;font-weight:700;font-size:16px;transition:.2s}
.btn:hover{background:var(--orange2);color:#fff;transform:translateY(-2px)}
.btn.ghost{background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.6)}
.btn.ghost:hover{background:rgba(255,255,255,.28)}
.btn.navy{background:var(--navy2)}
.btn.navy:hover{background:var(--blue)}
.btn.sm{padding:9px 18px;font-size:14px}

/* 内页 banner */
.page-hero{background:var(--navy);position:relative;color:#fff;padding:74px 0;text-align:center}
.page-hero img.bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.35}
.page-hero::after{content:"";position:absolute;inset:0;background:rgba(15,41,66,.55)}
.page-hero .wrap{position:relative;z-index:2}
.page-hero h1{color:#fff;font-size:40px;margin-bottom:8px}
.page-hero p{color:#dfe9f2;font-size:16px;max-width:680px;margin:0 auto}
.crumb{font-size:13px;color:#a9c0d6;margin-top:16px}
.crumb a{color:#fff}

/* ========== 区块 ========== */
section.block{padding:78px 0}
section.block.alt{background:var(--card)}
.sec-head{text-align:center;max-width:760px;margin:0 auto 46px}
.sec-head .eyebrow{color:var(--orange);letter-spacing:.2em;font-weight:700;text-transform:uppercase;font-size:13px}
.sec-head h2{font-size:36px;margin:8px 0 14px;color:var(--navy)}
.sec-head p{color:var(--muted);font-size:16px}
.sec-head .line{width:56px;height:4px;background:var(--orange2);border-radius:4px;margin:16px auto 0}

/* 核心指标 */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat{background:var(--card);border-radius:var(--radius);padding:30px 20px;text-align:center;box-shadow:var(--shadow);border-top:4px solid var(--navy2)}
.stat .v{font-size:42px;font-weight:800;color:var(--navy2);line-height:1}
.stat .v small{font-size:16px;color:var(--orange)}
.stat .k{color:var(--muted);margin-top:10px;font-size:14px}
.stat.warn{border-top-color:var(--orange)}

/* 展示区两栏 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split img{width:100%;height:420px;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow)}
.split h3{font-size:28px;margin-bottom:14px;color:var(--navy)}
.split p{color:var(--muted);margin-bottom:14px;font-size:16px}
.tick{list-style:none}
.tick li{padding:5px 0 5px 30px;position:relative;color:var(--ink)}
.tick li::before{content:"✓";position:absolute;left:0;color:var(--orange);font-weight:800}
.icard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.25s}
.icard:hover{transform:translateY(-6px);box-shadow:0 14px 30px rgba(15,41,66,.14)}
.icard img{width:100%;height:210px;object-fit:cover}
.icard .body{padding:20px 22px}
.icard h4{font-size:20px;color:var(--navy);margin-bottom:8px}
.icard p{color:var(--muted);font-size:14px}
.icard .more{margin-top:12px;color:var(--orange);font-weight:700;font-size:14px;display:inline-block}

/* 产品卡片横排样式 */
.product-list .icard{display:flex;flex-direction:row;align-items:center;justify-content:center}
.product-list .icard img{width:45%;height:180px;object-fit:cover;flex-shrink:0}
.product-list .icard .body{padding:20px 24px;flex:1;text-align:center}

.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;justify-items:stretch}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
@media(max-width:920px){.grid3,.grid4{grid-template-columns:repeat(2,1fr)}.stats{grid-template-columns:repeat(2,1fr)}.split{grid-template-columns:1fr}.hero h1{font-size:34px}.product-list .icard{flex-direction:column}.product-list .icard img{width:100%;height:160px}}
@media(max-width:560px){.grid3,.grid4,.grid2,.stats{grid-template-columns:1fr}}

/* CTA 区块 */
.cta-band{background:linear-gradient(120deg,var(--navy),var(--blue));color:#fff;padding:70px 0;text-align:center}
.cta-band h2{color:#fff;font-size:34px;margin-bottom:12px}
.cta-band p{color:#dbe7f2;font-size:17px;margin-bottom:26px}
.cta-band .phone{font-size:22px;font-weight:800;color:var(--orange2);letter-spacing:.04em}

/* ========== 页脚 ========== */
footer.site{background:var(--navy);color:#aebccb;padding:64px 0 26px}
footer.site .grid4 .icard{display:none}
footer.site h4{color:#fff;margin-bottom:16px;font-size:17px}
footer.site ul{list-style:none}
footer.site li{margin:8px 0;font-size:14px}
footer.site li a{color:#c7d5e2}
footer.site .col p{font-size:14px;line-height:1.9}
footer.site .bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:40px;padding-top:22px;font-size:13px;color:#7f90a0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ========== 面包屑 / 分页 / banner轮播 ========== */
.carousel{position:relative;overflow:hidden;min-height:inherit}
.carousel .slide{display:none;width:100%;min-height:inherit}
.carousel .slide.active{display:flex;align-items:center;justify-content:center}
.carousel .dots{position:absolute;bottom:22px;left:0;right:0;display:flex;justify-content:center;gap:8px;z-index:3}
.carousel .dots span{width:11px;height:11px;border-radius:50%;background:rgba(255,255,255,.5);cursor:pointer}
.carousel .dots span.on{background:var(--orange2)}
.pager{display:flex;justify-content:center;gap:8px;margin-top:30px}
.pager a{background:var(--card);border:1px solid var(--line);padding:7px 15px;border-radius:6px;font-size:14px}
.pager a.cur{background:var(--navy2);color:#fff;border-color:var(--navy2)}

/* ========== 联系 / 表单 ========== */
.contact-split{display:grid;grid-template-columns:1fr 1fr;gap:48px}
form.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;font-weight:600;color:var(--navy);margin-bottom:6px}
.field input,.field textarea,.field select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit;background:#fbfcfd}
.field input:focus,.field textarea:focus{border-color:var(--blue);outline:none;box-shadow:0 0 0 3px rgba(29,90,140,.12)}
.btn-block{width:100%;border:0;cursor:pointer}
.info-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:22px 24px;margin-bottom:18px;border-left:4px solid var(--orange)}
.info-card h4{color:var(--navy);margin-bottom:8px}
.info-card p{color:var(--muted);font-size:14px}
.success{background:#e5f3ec;color:#1f7a4d;padding:14px 16px;border-radius:8px;margin-bottom:16px;font-size:15px}

/* 新闻列表 */
.news-item{display:flex;gap:20px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);margin-bottom:20px;transition:.2s}
.news-item:hover{transform:translateY(-3px)}
.news-item img{width:300px;height:170px;object-fit:cover}
.news-item .nbody{padding:20px 22px}
.news-item .date{color:var(--orange);font-size:13px;font-weight:700}
.news-item h3{font-size:20px;margin:8px 0}
.news-item h3 a{color:var(--navy)}
.news-item p{color:var(--muted);font-size:14px}
@media(max-width:640px){.news-item{flex-direction:column}.news-item img{width:100%;height:auto}}

.article{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:40px}
.article .meta{color:var(--muted);font-size:14px;margin-bottom:20px}
.article .content{line-height:1.9}
.article .content p{margin:12px 0}
.article .content h2,.article .content h3{margin:20px 0 10px}
.article .navlinks{display:flex;justify-content:space-between;margin-top:36px;border-top:1px solid var(--line);padding-top:20px;font-size:14px}

.product-top{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.product-top img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.chip{background:#eef2f6;border:1px solid var(--line);padding:6px 14px;border-radius:20px;font-size:14px}

/* FAQ（GEO） */
.faq details{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:16px 20px;margin-bottom:12px;cursor:pointer}
.faq summary{font-weight:700;color:var(--navy);font-size:16px}
.faq details p{margin-top:10px;color:var(--muted)}
.back{color:var(--orange);font-weight:700;font-size:14px}

/* ========== 合作客户 ========== */
.partners{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.partners .pitem{flex:0 1 auto;min-width:180px;text-align:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 18px;font-weight:700;color:var(--navy);box-shadow:var(--shadow)}
.partners .pitem:hover{border-color:var(--orange);color:var(--orange);transform:translateY(-2px);transition:.2s}