/* 浙江国亨滤纸有限公司 — 站点样式表 */
:root{
  --brand:#0b6fbf;
  --brand-dark:#0a4b7c;
  --brand-deep:#083c62;
  --brand-tint:#eaf3fb;
  --accent:#f2c200;
  --ink:#16232e;
  --body:#3b4a57;
  --muted:#6b7b88;
  --line:#e3e9ef;
  --bg:#f5f8fa;
  --white:#fff;
  --radius:10px;
  --shadow:0 6px 24px rgba(10,60,98,.08);
  --shadow-lg:0 14px 40px rgba(10,60,98,.14);
  --wrap:1200px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--body);
  background:var(--white);
}
img{max-width:100%;height:auto;border:0;vertical-align:middle}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dark);text-decoration:underline}
h1,h2,h3,h4{color:var(--ink);line-height:1.3;margin:0 0 .6em;font-weight:700}
h1{font-size:34px}
h2{font-size:26px}
h3{font-size:19px}
p{margin:0 0 1em}
ul{margin:0 0 1em;padding-left:1.2em}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;z-index:99;background:var(--white);padding:10px 16px;border-radius:var(--radius);box-shadow:var(--shadow-lg)}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--brand-deep);color:#cfe2f2;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;min-height:38px;gap:16px}
.topbar a{color:#cfe2f2}
.topbar a:hover{color:var(--white);text-decoration:none}
.topbar .contact{display:flex;gap:18px;flex-wrap:wrap}
.langsw{display:flex;align-items:center;gap:6px;white-space:nowrap}
.langsw a{display:inline-flex;align-items:center;gap:4px;padding:2px 9px;border-radius:999px;border:1px solid rgba(255,255,255,.28)}
.langsw a.on{background:var(--accent);border-color:var(--accent);color:#3a2f00;font-weight:700}

/* ---------- 页头 ---------- */
.masthead{background:var(--white);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}
.masthead .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:84px}
.brand{display:flex;align-items:center;gap:14px;min-width:0}
.brand img{width:96px;height:auto}
.brand .names{min-width:0}
.brand .cn{display:block;font-size:20px;font-weight:700;color:var(--ink);letter-spacing:.5px;line-height:1.3}
.brand .en{display:block;font-size:12px;color:var(--muted);letter-spacing:.6px;text-transform:uppercase}
.navbar{display:flex;align-items:center}
.navbar ul{display:flex;gap:2px;list-style:none;margin:0;padding:0}
.navbar li{position:relative}
.navbar a.top{display:block;padding:12px 14px;color:var(--ink);font-size:15px;font-weight:600;border-radius:8px;white-space:nowrap}
.navbar a.top:hover,.navbar li:hover>a.top{background:var(--brand-tint);color:var(--brand-dark);text-decoration:none}
.navbar li.current>a.top{color:var(--brand);box-shadow:inset 0 -3px 0 var(--accent)}
.navbar .sub{display:none;position:absolute;left:0;top:100%;min-width:170px;background:var(--white);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:8px;list-style:none;margin:0;z-index:50}
.navbar .sub li{display:block}
.navbar .sub a{display:block;padding:8px 12px;font-size:14px;color:var(--body);border-radius:6px}
.navbar .sub a:hover{background:var(--brand-tint);color:var(--brand-dark);text-decoration:none}
.navbar li.has-sub:hover .sub,.navbar li.has-sub:focus-within .sub{display:block}
.navtoggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;cursor:pointer}
.navtoggle span{display:block;width:20px;height:2px;background:var(--ink);margin:4px 0;border-radius:2px}

/* ---------- 通用区块 ---------- */
.section{padding:56px 0}
.section.alt{background:var(--bg)}
.section.tight{padding:36px 0}
.sec-head{max-width:760px;margin:0 0 32px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-head .kicker{display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--brand);margin-bottom:8px}
.sec-head h2{margin-bottom:10px}
.sec-head p{margin:0;color:var(--muted)}
.lead{font-size:17px;color:var(--body)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,background .15s ease}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 16px rgba(11,111,191,.28)}
.btn-primary:hover{background:var(--brand-dark);color:#fff}
.btn-accent{background:var(--accent);color:#3a2f00}
.btn-accent:hover{background:#e0b400;color:#3a2f00}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.1)}
.btn-line{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-line:hover{border-color:var(--brand);color:var(--brand)}

/* ---------- 首屏 ---------- */
.hero{position:relative;background:linear-gradient(135deg,var(--brand-deep) 0%,var(--brand-dark) 55%,#0b5f9e 100%);color:#e9f3fb;overflow:hidden}
.hero:after{content:"";position:absolute;inset:auto -10% -40% 55%;height:420px;background:radial-gradient(closest-side,rgba(242,194,0,.22),transparent);pointer-events:none}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center;padding-top:64px;padding-bottom:64px}
.hero h1{color:#fff;font-size:40px;margin-bottom:14px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{color:#cfe2f2;font-size:17px;max-width:560px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.hero .facts{display:flex;gap:28px;flex-wrap:wrap;margin-top:30px;padding-top:22px;border-top:1px solid rgba(255,255,255,.18)}
.hero .facts div strong{display:block;font-size:24px;color:#fff;line-height:1.2}
.hero .facts div span{font-size:13px;color:#a9c8e0}
.hero .shot{border-radius:14px;overflow:hidden;box-shadow:0 22px 50px rgba(0,0,0,.3);background:#0a3f66}
.hero .shot img{display:block;width:100%}

/* ---------- 卡片 ---------- */
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:box-shadow .18s ease,transform .18s ease;display:flex;flex-direction:column}
.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.card .thumb{aspect-ratio:4/3;background:var(--bg);overflow:hidden;display:block}
.card .thumb img{width:100%;height:100%;object-fit:cover;display:block}
.card .body{padding:18px 20px 20px}
.card h3{margin-bottom:6px;font-size:17px}
.card h3 a{color:var(--ink)}
.card h3 a:hover{color:var(--brand);text-decoration:none}
.card p{margin:0;font-size:14px;color:var(--muted)}
.card .meta{margin-top:10px;font-size:13px;color:var(--muted)}

.catcard{position:relative;display:block;border-radius:var(--radius);overflow:hidden;background:var(--brand-deep);min-height:190px}
.catcard img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.catcard:hover img{transform:scale(1.04)}
.catcard .lbl{position:relative;display:flex;flex-direction:column;justify-content:flex-end;height:100%;min-height:190px;padding:18px;color:#fff;background:linear-gradient(to top,rgba(8,50,82,.92) 0%,rgba(8,50,82,.62) 34%,rgba(8,50,82,.12) 70%,rgba(8,50,82,0) 100%)}
.catcard .lbl strong{font-size:18px;text-shadow:0 1px 6px rgba(0,0,0,.45)}
.catcard .lbl small{text-shadow:0 1px 5px rgba(0,0,0,.5)}
.catcard.noimg{background:radial-gradient(120% 120% at 80% 10%,#1a7bbd 0%,#0b5f9e 45%,#083c62 100%)}
.catcard .lbl small{color:#c9e0f2;font-size:12.5px;letter-spacing:.4px}

/* ---------- 内容页 ---------- */
.crumb{background:var(--bg);border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.crumb .wrap{padding:12px 20px}
.crumb a{color:var(--muted)}
.crumb span.sep{margin:0 8px;color:#b9c6d1}
.page-head{background:linear-gradient(135deg,var(--brand-deep),var(--brand-dark));color:#fff;padding:44px 0}
.page-head h1{color:#fff;margin:0 0 8px}
.page-head p{margin:0;color:#cfe2f2;max-width:820px}
.layout{display:grid;grid-template-columns:264px 1fr;gap:36px;align-items:start;padding:40px 0 64px}
.aside{position:sticky;top:104px}
.aside .box{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.aside .box h2{font-size:16px;margin:0;padding:14px 18px;background:var(--brand-tint);color:var(--brand-dark);border-bottom:1px solid var(--line)}
.aside .box ul{list-style:none;margin:0;padding:8px}
.aside .box li a{display:block;padding:9px 12px;border-radius:7px;color:var(--body);font-size:14.5px}
.aside .box li a:hover{background:var(--bg);text-decoration:none;color:var(--brand-dark)}
.aside .box li.current a{background:var(--brand);color:#fff;font-weight:600}
.aside .help{margin-top:20px;background:var(--brand-deep);color:#d6e8f6;border-radius:var(--radius);padding:20px}
.aside .help strong{display:block;color:#fff;font-size:15px;margin-bottom:6px}
.aside .help a{color:var(--accent);font-weight:700}
.article{background:#fff}
.article h2{margin-top:1.4em}
.article h2:first-child{margin-top:0}
.prose{font-size:16.5px}
.prose img{border-radius:8px}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gallery figure{margin:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff}
.gallery img{display:block;width:100%;aspect-ratio:4/3;object-fit:cover}
.gallery figcaption{padding:8px 12px;font-size:13px;color:var(--muted);background:var(--bg)}

/* ---------- 产品 ---------- */
.tabs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.tabs a{padding:9px 16px;border:1px solid var(--line);border-radius:999px;font-size:14.5px;color:var(--body);background:#fff}
.tabs a:hover{border-color:var(--brand);color:var(--brand);text-decoration:none}
.tabs a.on{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}
.prodgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.product .thumb{aspect-ratio:4/3;background:#f7fafc;display:flex;align-items:center;justify-content:center;overflow:hidden}
.product .thumb img{width:100%;height:100%;object-fit:cover}
.pager{display:flex;gap:8px;flex-wrap:wrap;margin-top:32px;align-items:center}
.pager a,.pager strong{padding:8px 14px;border:1px solid var(--line);border-radius:7px;font-size:14px;background:#fff}
.pager strong{background:var(--brand);border-color:var(--brand);color:#fff}
.pd{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:start}
.pd .pic{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.spec{width:100%;border-collapse:collapse;font-size:15px}
.spec th,.spec td{border:1px solid var(--line);padding:10px 14px;text-align:left;vertical-align:top}
.spec th{background:var(--bg);width:120px;color:var(--ink);font-weight:600}

/* ---------- 新闻 ---------- */
.newslist{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.newslist li{display:flex;gap:18px;align-items:baseline;padding:16px 4px;border-bottom:1px solid var(--line)}
.newslist .date{color:var(--muted);font-size:14px;white-space:nowrap;font-variant-numeric:tabular-nums}
.newslist a{font-size:16.5px;color:var(--ink);font-weight:600}
.newslist a:hover{color:var(--brand)}

/* ---------- 表单 / 表格 ---------- */
.form{display:grid;gap:16px;max-width:720px}
.frow{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.field label{display:block;font-size:14px;font-weight:600;color:var(--ink);margin-bottom:6px}
.field input,.field select,.field textarea{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:8px;font:inherit;color:var(--ink);background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid rgba(11,111,191,.35);border-color:var(--brand)}
.field .hint{font-size:12.5px;color:var(--muted);margin-top:4px}
.table{width:100%;border-collapse:collapse;font-size:15px}
.table th,.table td{border:1px solid var(--line);padding:11px 14px;text-align:left}
.table th{background:var(--brand-tint);color:var(--brand-dark);font-weight:600;white-space:nowrap}
.notice{border-left:4px solid var(--accent);background:#fffbeb;padding:14px 18px;border-radius:0 8px 8px 0;color:#5c4a00}

/* ---------- 联系 / FAQ ---------- */
.contactgrid{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:start}
.infolist{list-style:none;margin:0;padding:0}
.infolist li{display:flex;gap:12px;padding:12px 0;border-bottom:1px dashed var(--line)}
.infolist li b{color:var(--ink);min-width:76px;font-weight:600}
.faq details{border:1px solid var(--line);border-radius:var(--radius);margin-bottom:12px;background:#fff}
.faq summary{cursor:pointer;padding:15px 18px;font-weight:600;color:var(--ink);list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary:before{content:"+";color:var(--brand);font-weight:700;margin-right:10px}
.faq details[open] summary:before{content:"−"}
.faq .a{padding:0 18px 16px 44px;color:var(--body)}
.cta{background:linear-gradient(135deg,var(--brand-dark),var(--brand));color:#fff;border-radius:14px;padding:34px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.cta h2{color:#fff;margin:0 0 6px}
.cta p{margin:0;color:#cfe2f2}

/* ---------- 页脚 ---------- */
.footer{background:#0a2d49;color:#a9c4d9;font-size:14.5px;margin-top:0}
.footer .cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px;padding:48px 0 34px}
.footer h3{color:#fff;font-size:15px;margin-bottom:14px}
.footer a{color:#a9c4d9}
.footer a:hover{color:#fff;text-decoration:none}
.footer ul{list-style:none;margin:0;padding:0}
.footer li{padding:5px 0}
.footer .about p{color:#8fb0c9;font-size:13.5px}
.footer .bottom{border-top:1px solid rgba(255,255,255,.12);padding:16px 0;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:13px;color:#7f9db6}
.footer .bottom a{color:#9dbad1}
.totop{position:fixed;right:20px;bottom:24px;width:42px;height:42px;border-radius:50%;background:var(--brand);color:#fff;border:0;cursor:pointer;box-shadow:var(--shadow-lg);display:none;z-index:60;font-size:18px;line-height:1}
.totop.show{display:block}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .hero .wrap{grid-template-columns:1fr;gap:30px}
  .g4{grid-template-columns:repeat(2,1fr)}
  .footer .cols{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  .navtoggle{display:block}
  .masthead .wrap{min-height:70px}
  .navbar{position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow);display:none;padding:10px 16px 18px}
  .navbar.open{display:block}
  .navbar ul{flex-direction:column;gap:0}
  .navbar li{width:100%}
  .navbar a.top{padding:12px 6px;border-bottom:1px solid var(--line);border-radius:0}
  .navbar .sub{position:static;display:block;border:0;box-shadow:none;padding:0 0 6px 14px}
  .navbar li.current>a.top{box-shadow:inset 3px 0 0 var(--accent)}
  .layout{grid-template-columns:1fr;gap:26px;padding:26px 0 48px}
  .aside{position:static}
  .pd{grid-template-columns:1fr}
  .contactgrid{grid-template-columns:1fr}
  .g3,.prodgrid,.gallery{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:620px){
  body{font-size:15.5px}
  h1{font-size:26px}
  .hero h1{font-size:28px}
  h2{font-size:22px}
  .section{padding:38px 0}
  .hero .wrap{padding-top:36px;padding-bottom:40px}
  .g2,.g3,.g4,.prodgrid,.gallery,.frow,.footer .cols{grid-template-columns:1fr}
  .topbar .wrap{flex-direction:column;align-items:flex-start;padding-top:8px;padding-bottom:8px;gap:6px}
  .brand img{width:72px}
  .brand .cn{font-size:17px}
  .brand .en{font-size:10.5px}
  .cta{padding:24px}
}
@media print{
  .masthead,.topbar,.footer,.cta,.totop,.aside{display:none}
  .hero,.page-head{background:#fff;color:#000}
  .hero h1,.page-head h1{color:#000}
}