/* ============================================================
   上海洁兴新材料科技有限公司 · 官网统一样式
   定位：原材料平台型研发生产制造企业
   ============================================================ */
:root{
  --navy:#0d1b2a;
  --navy2:#10243e;
  --navy3:#16304f;
  --red:#c8102e;
  --red-d:#a30d26;
  --ink:#1c2733;
  --gray:#5a6675;
  --line:#e3e8ef;
  --bg2:#f4f6f9;
  --white:#ffffff;
  --gold:#b98a2f;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Source Han Sans SC","Noto Sans SC","HarmonyOS Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#3a4763;background:var(--white);line-height:1.85;font-size:15px;letter-spacing:.015em}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* ---------- 导航 ---------- */
nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.97);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);box-shadow:0 1px 14px rgba(13,27,42,.05)}
.bar{max-width:1240px;margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:26px;height:68px}
.logo{display:flex;align-items:center;margin-right:auto}
.logo .logo-img{height:44px;width:auto;display:block}
.links{display:flex;align-items:center;gap:4px}
.links a{color:#3c4a63;font-size:14px;padding:8px 12px;border-radius:6px;transition:.2s;white-space:nowrap}
.links a:hover{color:var(--red);background:#faf2f4}
.links a.active{color:var(--red);font-weight:600;background:#fdf0f2}
.nav-cta{background:var(--red);color:#fff !important;padding:9px 18px !important;border-radius:6px;font-weight:600}
.nav-cta:hover{background:var(--red-d) !important}
.menu-btn{display:none;background:none;border:none;color:var(--navy);font-size:24px;cursor:pointer}

/* ---------- Hero ---------- */
.hero{position:relative;background:var(--navy);color:#fff;padding:170px 0 100px;overflow:hidden}
.hero .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.32}
.hero .inner{position:relative;z-index:2}
.kicker{font-size:13px;letter-spacing:3px;color:#8fb3d9;text-transform:uppercase;margin-bottom:18px;font-weight:600}
.hero h1{font-size:52px;line-height:1.26;font-weight:600;letter-spacing:2px}
.hero h1 strong{color:#fff}
.hero .sub{margin-top:22px;font-size:16px;color:#c4d4e8;max-width:760px}
.hero .sub.big{font-size:20px;color:#dce9f8}
.cta{margin-top:36px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 30px;border-radius:6px;font-size:15px;font-weight:600;transition:.2s;cursor:pointer;border:none}
.btn.red{background:var(--red);color:#fff}
.btn.red:hover{background:var(--red-d)}
.btn.ghost{border:1px solid rgba(255,255,255,.45);color:#fff}
.btn.ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.hero-tags{margin-top:34px;display:flex;gap:10px;flex-wrap:wrap}
.hero-tags span{font-size:13px;color:#a8c3de;border:1px solid rgba(255,255,255,.22);padding:5px 14px;border-radius:20px}

/* ---------- 通用区块 ---------- */
section{padding:90px 0}
section.gray{background:var(--bg2)}
section.dark{background:var(--navy);color:#fff}
.sec-head{margin-bottom:52px}
.sec-head .no{font-size:12px;letter-spacing:3px;color:var(--red);font-weight:700;text-transform:uppercase;margin-bottom:10px}
.sec-head h2{font-size:34px;font-weight:700;color:var(--navy);line-height:1.3}
section.dark .sec-head h2{color:#fff}
.sec-head h2 small{display:block;font-size:13px;color:#8a97a8;font-weight:400;letter-spacing:1.5px;margin-top:6px;text-transform:uppercase}
section.dark .sec-head h2 small{color:#7d95b0}
.sec-head .rule{width:56px;height:3px;background:var(--red);margin-top:18px}
.sec-head .intro{margin-top:18px;font-size:16px;color:var(--gray);max-width:820px}
section.dark .sec-head .intro{color:#9fb3c6}

/* ---------- 卡片 ---------- */
.cards4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.cards5{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cards2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:30px 26px;transition:.25s;position:relative}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(13,27,42,.10);border-color:#cdd8e4}
.card .num{font-size:13px;font-weight:700;color:#b6c2d0;letter-spacing:1px}
.card .tag{display:inline-block;font-size:11.5px;letter-spacing:1px;color:var(--red);font-weight:700;margin:6px 0 10px;text-transform:uppercase}
.card h3{font-size:18px;color:var(--navy);margin-bottom:10px;font-weight:700}
.card p{font-size:13.5px;color:var(--gray);line-height:1.75}
.card .go{display:inline-block;margin-top:14px;font-size:13px;color:var(--red);font-weight:600}
section.dark .card{background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.14)}
section.dark .card h3{color:#fff}
section.dark .card p{color:#9fb3c6}

/* 产品家族卡（首页总览） */
.fam-card{display:flex;flex-direction:column;overflow:hidden;padding:0}
.fam-card img{height:150px;width:100%;object-fit:cover}
.fam-card .body{padding:22px 24px 26px}
.fam-card h3{font-size:17px}
.fam-card .en{font-size:11px;letter-spacing:1.5px;color:#9aa7b6;text-transform:uppercase;margin-bottom:4px}

/* ---------- 数据条 ---------- */
.stats{background:var(--navy2);padding:46px 0}
.stats .row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stats .num{font-size:34px;font-weight:700;color:#fff}
.stats .num sup{font-size:15px;font-weight:400;color:#8fb3d9}
.stats .lbl{font-size:13px;color:#8fb3d9;margin-top:6px}

/* ---------- 参数表 ---------- */
.table-scroll{overflow-x:auto}
table.spec{width:100%;border-collapse:collapse;font-size:13.5px;background:#fff}
table.spec th{background:var(--navy);color:#fff;text-align:left;padding:11px 14px;font-weight:600;white-space:nowrap}
table.spec td{border-bottom:1px solid var(--line);padding:10px 14px;color:var(--ink);vertical-align:top}
table.spec td.k{color:var(--gray);white-space:nowrap;width:34%}
table.spec tr:hover td{background:#f8fafc}
.tb{display:inline-block;font-size:11px;background:#eef3f8;color:#41608a;border:1px solid #d4e0ee;border-radius:4px;padding:1px 8px;margin-left:6px;white-space:nowrap}
.tb.warn{background:#fdf3e7;color:#9a6212;border-color:#f0dcb8}

/* ---------- 产品家族块 ---------- */
.pfam{border:1px solid var(--line);border-radius:12px;background:#fff;margin-bottom:40px;overflow:hidden}
.pfam .head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:26px 32px;background:var(--navy);flex-wrap:wrap}
.pfam .head h3{color:#fff;font-size:22px}
.pfam .head .code{font-size:12px;letter-spacing:1.5px;color:#ffb3bf;border:1px solid rgba(255,179,191,.4);padding:4px 12px;border-radius:20px;white-space:nowrap}
.pfam .body{padding:30px 32px}
.pfam .desc{font-size:14.5px;color:var(--gray);margin-bottom:18px}
.pfam .desc b{color:var(--navy)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 22px}
.chips span{font-size:12.5px;background:var(--bg2);border:1px solid var(--line);color:#41546c;padding:5px 13px;border-radius:20px}
.cols{display:grid;grid-template-columns:1.25fr 1fr;gap:34px}
.cols h4{font-size:15px;color:var(--navy);margin-bottom:12px;font-weight:700}
.cols ul{list-style:none}
.cols ul li{font-size:13.5px;color:var(--gray);padding:7px 0 7px 20px;position:relative;border-bottom:1px dashed var(--line)}
.cols ul li::before{content:"";position:absolute;left:2px;top:15px;width:7px;height:7px;background:var(--red);border-radius:2px}
.boundary{margin-top:22px;font-size:13px;color:#6b5b2e;background:#fbf6ea;border-left:3px solid var(--gold);padding:12px 16px;border-radius:0 6px 6px 0}

/* ---------- 流程 ---------- */
.flow{display:flex;align-items:stretch;gap:8px;flex-wrap:wrap}
.fnode{flex:1;min-width:150px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.16);border-radius:10px;padding:20px 16px}
.fnode .fn{font-size:11px;color:#ff97a6;font-weight:700;letter-spacing:1px}
.fnode h4{color:#fff;font-size:15.5px;margin:8px 0 6px}
.fnode p{font-size:12.5px;color:#9fb3c6;line-height:1.6}
.farrow{display:flex;align-items:center;color:#ff97a6;font-size:20px}

/* ---------- 行业/应用块 ---------- */
.app-blk{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff;margin-bottom:36px}
.app-blk .top{display:flex;gap:0;flex-wrap:wrap}
.app-blk .top img{width:42%;min-width:300px;object-fit:cover;max-height:300px}
.app-blk .top .txt{flex:1;padding:30px 34px;min-width:300px}
.app-blk .who{display:inline-block;font-size:12px;font-weight:700;color:var(--red);letter-spacing:1.5px;margin-bottom:8px}
.app-blk h3{font-size:23px;color:var(--navy);margin-bottom:10px}
.app-blk .top p{font-size:14px;color:var(--gray)}
.app-blk .grid3{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line)}
.app-blk .grid3>div{padding:24px 28px;border-right:1px solid var(--line)}
.app-blk .grid3>div:last-child{border-right:none}
.app-blk .grid3 h4{font-size:14px;color:var(--navy);margin-bottom:10px}
.app-blk .grid3 h4 .role{font-size:11px;color:var(--red);display:block;letter-spacing:1px;margin-bottom:3px}
.app-blk .grid3 ul{list-style:none}
.app-blk .grid3 li{font-size:13px;color:var(--gray);padding:4px 0 4px 16px;position:relative}
.app-blk .grid3 li::before{content:"·";position:absolute;left:2px;color:var(--red);font-weight:700}
.app-blk .foot{padding:18px 30px;background:var(--bg2);display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}
.app-blk .foot .tags{display:flex;gap:8px;flex-wrap:wrap}
.app-blk .foot .tags span{font-size:12px;background:#fff;border:1px solid var(--line);padding:4px 12px;border-radius:16px;color:#41546c}

/* ---------- 案例 ---------- */
.case{border:1px solid var(--line);border-left:4px solid var(--red);border-radius:10px;background:#fff;padding:26px 30px;margin-top:26px}
.case .case-tag{font-size:12.5px;font-weight:700;color:var(--red);letter-spacing:1px;margin-bottom:14px}
.case-flow{display:flex;gap:10px;align-items:stretch;flex-wrap:wrap}
.case-step{flex:1;min-width:200px;background:var(--bg2);border-radius:8px;padding:16px 18px}
.case-step h5{font-size:12px;color:#8a97a8;letter-spacing:1px;margin-bottom:6px;text-transform:uppercase}
.case-step p{font-size:13px;color:var(--ink)}
.case-step.result{background:#fdf0f2}
.case-step.result p{color:var(--red-d)}
.case-arrow{display:flex;align-items:center;color:#b6c2d0;font-size:18px}

/* ---------- 承诺/交付 ---------- */
.dlist{list-style:none;display:grid;gap:16px}
.dlist li{display:flex;gap:16px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 22px}
.dlist .dn{font-size:20px;font-weight:800;color:var(--red);min-width:34px}
.dlist h4{font-size:15.5px;color:var(--navy);margin-bottom:4px}
.dlist p{font-size:13px;color:var(--gray)}

/* ---------- 表单 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:50px;align-items:start}
.c-line{display:flex;gap:14px;padding:12px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.c-line .k{min-width:52px;color:#8a97a8;font-size:13px;padding-top:2px}
.c-line span:last-child{color:var(--ink)}
.c-line a{color:var(--red);font-weight:600}
form .row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
form .row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--navy);font-weight:600;margin-bottom:6px}
.field label .req{color:var(--red)}
.field input,.field select,.field textarea{width:100%;border:1px solid #cfd8e3;border-radius:6px;padding:11px 13px;font-size:14px;font-family:inherit;color:var(--ink);background:#fff;transition:.2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(200,16,46,.10)}
.field textarea{resize:vertical;min-height:110px}
.submit{background:var(--red);color:#fff;border:none;padding:14px 40px;border-radius:6px;font-size:15px;font-weight:700;cursor:pointer;transition:.2s}
.submit:hover{background:var(--red-d)}
.form-note{font-size:12.5px;color:#8a97a8;margin-top:12px}
.form-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.btn-outline{display:inline-block;border:1px solid #cfd8e3;color:var(--navy);padding:12px 22px;border-radius:6px;font-size:14px;font-weight:600;cursor:pointer;background:#fff;transition:.2s}
.btn-outline:hover{border-color:var(--red);color:var(--red)}
#form-status{font-size:13.5px;color:var(--red-d);margin-top:10px;font-weight:600}

/* ---------- CTA 条 ---------- */
.cta-band{background:var(--navy);border-radius:14px;padding:46px 50px;display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap;color:#fff}
.cta-band h3{font-size:24px;margin-bottom:8px}
.cta-band p{color:#9fb3c6;font-size:14px;max-width:640px}

/* ---------- 页脚 ---------- */
footer{background:var(--navy);color:#9fb3c6;padding:60px 0 0;font-size:13.5px}
.foot-top{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:40px}
.foot-logo{display:flex;align-items:center}
.foot-logo .pill{display:inline-block;background:#fff;border-radius:8px;padding:9px 16px;line-height:0}
.foot-logo .pill img{height:30px;width:auto;display:block}
.foot-slogan{margin-top:10px;font-size:13px}
.foot-nav{display:grid;grid-template-columns:repeat(2,auto);gap:8px 40px}
.foot-nav a{color:#9fb3c6;transition:.2s}
.foot-nav a:hover{color:#fff}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.5px;color:#6d8099}

/* ---------- 子页 Hero ---------- */
.page-hero{position:relative;background:var(--navy);color:#fff;padding:160px 0 80px;overflow:hidden}
.page-hero .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.3}
.page-hero .inner{position:relative;z-index:2}
.page-hero h1{font-size:42px;font-weight:700;margin-top:6px}
.page-hero p{margin-top:14px;color:#c4d4e8;font-size:16px;max-width:720px}
.crumbs{font-size:13px;color:#7d95b0;margin-bottom:14px}
.crumbs a{color:#7d95b0}
.crumbs a:hover{color:#fff}

/* ---------- 面包屑区块标题 ---------- */
.blk-head{display:flex;align-items:center;gap:14px;margin-bottom:26px}
.blk-head .no{width:38px;height:38px;border-radius:8px;background:var(--red);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;flex-shrink:0}
.blk-head h2{font-size:24px;color:var(--navy)}
.blk-sub{color:var(--gray);font-size:14.5px;margin:-14px 0 26px 52px}

/* ---------- 关于我们行 ---------- */
.rows{display:grid;gap:18px}
.row-item{display:flex;gap:22px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:26px 30px}
.row-item .idx{font-size:26px;font-weight:800;color:var(--red);opacity:.85;min-width:44px}
.row-item h4{font-size:16.5px;color:var(--navy);margin-bottom:8px}
.row-item p{font-size:14px;color:var(--gray)}

/* ---------- 公司实景 ---------- */
.building{margin:0}
.building img{width:100%;border-radius:14px;box-shadow:0 16px 42px rgba(13,27,42,.10)}
.building figcaption{text-align:center;font-size:13px;color:#8a97a8;margin-top:12px;letter-spacing:1.5px}

/* ---------- 动画 ---------- */
.fade{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.fade.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.fade{opacity:1;transform:none;transition:none}}

/* ---------- 响应式 ---------- */
@media (max-width:1020px){
  .cards5{grid-template-columns:repeat(3,1fr)}
  .cards4{grid-template-columns:repeat(2,1fr)}
  .app-blk .grid3{grid-template-columns:1fr}
  .app-blk .grid3>div{border-right:none;border-bottom:1px solid var(--line)}
  .cols{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:860px){
  .menu-btn{display:block}
  .links{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:14px 20px;gap:2px;border-bottom:1px solid var(--line);box-shadow:0 18px 32px rgba(13,27,42,.10)}
  .links.open{display:flex}
  .links a{padding:12px 14px}
  .hero{padding:130px 0 70px}
  .hero h1{font-size:34px}
  .page-hero h1{font-size:30px}
  section{padding:64px 0}
  .sec-head h2{font-size:26px}
  .cards5{grid-template-columns:repeat(2,1fr)}
  .stats .row{grid-template-columns:repeat(2,1fr)}
  .app-blk .top img{width:100%;max-height:220px}
  .cta-band{padding:34px 28px}
  form .row2,form .row3{grid-template-columns:1fr}
}
@media (max-width:560px){
  .cards4,.cards3,.cards2,.cards5{grid-template-columns:1fr}
  .hero h1{font-size:28px}
  .pfam .body{padding:22px 18px}
  .pfam .head{padding:20px 18px}
}