/* 杭州双久金属 · 官网B 全局样式（工业大厂版） */
:root{
  --navy:#0A2A49;      /* 深藏蓝 */
  --navy-2:#12406B;    /* 中蓝 */
  --navy-3:#1A5487;    /* 亮蓝 */
  --steel:#1F2D3D;     /* 钢灰 */
  --ink:#14212D;       /* 深墨 */
  --gray:#F5F7FA;      /* 浅灰底 */
  --line:#E6EBF1;      /* 边框 */
  --accent:#E8601C;    /* 工业橙 */
  --accent-2:#F2762F;  /* 亮橙 */
  --gold:#F2A93B;      /* 金色数据 */
  --muted:#64788A;     /* 次要文字 */
  --muted-2:#96A5B4;
  --radius:14px;
  --shadow-sm:0 4px 14px rgba(10,42,73,.06);
  --shadow-md:0 14px 34px rgba(10,42,73,.12);
  --shadow-lg:0 24px 60px rgba(10,42,73,.20);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--steel);line-height:1.75;background:#fff;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== 顶部信息条 ===== */
.topbar{background:#081F35;color:#9fb2c6;font-size:13px;border-bottom:1px solid rgba(255,255,255,.05)}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;padding:7px 24px;gap:12px;flex-wrap:wrap}
.topbar b{color:#fff;font-weight:600}

/* ===== 导航 ===== */
header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);box-shadow:0 1px 0 rgba(10,42,73,.02)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.logo{display:flex;flex-direction:column;line-height:1.15}
.logo b{font-size:25px;font-weight:800;color:var(--navy);letter-spacing:1px}
.logo small{font-size:10px;color:var(--muted);letter-spacing:4px;text-transform:uppercase;margin-top:2px}
.menu{display:flex;gap:30px;font-size:15px;font-weight:500}
.menu a{color:var(--steel);padding:8px 0;border-bottom:2px solid transparent;transition:.2s}
.menu a:hover,.menu a.on{color:var(--navy-3);border-color:var(--accent)}
.tel{font-size:19px;font-weight:800;color:var(--accent);text-align:right;line-height:1.25}
.tel small{display:block;font-size:11px;color:var(--muted);font-weight:400;letter-spacing:1px}

/* ===== Hero ===== */
.hero{position:relative;overflow:hidden;background:linear-gradient(120deg,#06182B 0%,#0A2A49 45%,#12406B 100%);color:#fff}
.hero::before{content:"";position:absolute;inset:0;background:
  radial-gradient(900px 400px at 85% 10%,rgba(26,84,135,.55),transparent 60%),
  radial-gradient(700px 500px at 0% 100%,rgba(232,96,28,.18),transparent 55%),
  repeating-linear-gradient(115deg,rgba(255,255,255,.022) 0,rgba(255,255,255,.022) 1px,transparent 1px,transparent 26px);}
.hero::after{content:"";position:absolute;left:-120px;bottom:-160px;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(242,169,59,.14),transparent 70%)}
.hero .wrap{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center;padding:74px 24px 84px}
.hero .badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);backdrop-filter:blur(6px);color:#dfeaf5;font-size:13px;letter-spacing:1px;padding:7px 16px;border-radius:30px;margin-bottom:22px}
.hero .badge i{width:7px;height:7px;border-radius:50%;background:var(--gold);box-shadow:0 0 0 4px rgba(242,169,59,.22);display:inline-block}
.hero h1{font-size:48px;line-height:1.28;font-weight:800;letter-spacing:1px;margin-bottom:20px}
.hero h1 .hl{color:var(--gold)}
.hero h1 .ac{color:var(--accent-2)}
.hero p{font-size:17px;color:#c3d4e6;margin-bottom:28px;max-width:540px}
.cta{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;padding:14px 32px;border-radius:8px;font-size:16px;font-weight:700;letter-spacing:.5px;transition:.22s;box-shadow:0 8px 22px rgba(232,96,28,.32)}
.btn:hover{background:var(--accent-2);transform:translateY(-2px);box-shadow:0 12px 28px rgba(232,96,28,.42)}
.btn.ghost{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.28);box-shadow:none}
.btn.ghost:hover{border-color:#fff;background:rgba(255,255,255,.12)}
.hero .trust{display:flex;gap:22px;margin-top:30px;flex-wrap:wrap}
.hero .trust span{display:flex;align-items:center;gap:7px;font-size:13px;color:#aec3d6}
.hero .trust svg{width:16px;height:16px;stroke:var(--gold)}
.hero figure{position:relative}
.hero figure img{width:100%;border-radius:16px;box-shadow:0 30px 70px rgba(0,0,0,.45);border:1px solid rgba(255,255,255,.14)}
.hero figure::after{content:"";position:absolute;inset:0;border-radius:16px;background:linear-gradient(160deg,rgba(255,255,255,.12),transparent 40%)}

/* ===== 数据条 ===== */
.stats{background:linear-gradient(90deg,#081F35,#0A2A49);color:#fff}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);padding:38px 24px}
.stats .it{text-align:center;position:relative}
.stats .it+.it::before{content:"";position:absolute;left:0;top:18%;bottom:18%;width:1px;background:linear-gradient(rgba(255,255,255,0),rgba(255,255,255,.18),rgba(255,255,255,0))}
.stats b{display:block;font-size:38px;font-weight:800;line-height:1.1;color:#fff}
.stats b em{font-style:normal;color:var(--gold);font-size:22px;margin-left:2px}
.stats span{font-size:14px;color:#8fa8bf;letter-spacing:1px}

/* ===== 通用区块 ===== */
.sec{padding:84px 0}
.sec.gray{background:var(--gray)}
.sec-h{text-align:center;margin-bottom:48px}
.sec-h .kicker{display:inline-block;font-size:13px;letter-spacing:3px;text-transform:uppercase;color:var(--accent);font-weight:700;margin-bottom:10px}
.sec-h h2{font-size:34px;font-weight:800;color:var(--navy);margin-bottom:12px;letter-spacing:.5px}
.sec-h h2::after{content:"";display:block;width:46px;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--accent),var(--gold));margin:16px auto 0}
.sec-h p{color:var(--muted);font-size:16px;max-width:640px;margin:0 auto}

/* ===== 产品分类卡片 ===== */
.cats{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.cat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;display:flex;flex-direction:column}
.cat:hover{box-shadow:var(--shadow-md);transform:translateY(-6px);border-color:#d7e0ea}
.cat .media{height:210px;overflow:hidden;position:relative;background:linear-gradient(135deg,#eef2f7,#e3eaf2)}
.cat .media img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.cat:hover .media img{transform:scale(1.07)}
.cat .bd{padding:24px 26px 26px;display:flex;flex-direction:column;flex:1}
.cat h3{font-size:21px;color:var(--navy);margin-bottom:10px;font-weight:700}
.cat .tag{display:inline-block;background:#eef3f8;color:var(--navy-2);font-size:12px;padding:3px 12px;border-radius:20px;margin:0 6px 12px 0;font-weight:600}
.cat .tag.hot{background:#fdeee3;color:var(--accent)}
.cat p{font-size:14px;color:var(--muted);margin-bottom:16px;flex:1}
.cat a.more{color:var(--accent);font-weight:700;font-size:14px;display:inline-flex;align-items:center;gap:6px;transition:.2s}
.cat a.more:hover{gap:10px}

/* 图片占位（精致版） */
.ph{height:210px;border:none;border-radius:0;font-size:14px;background:
  radial-gradient(400px 200px at 20% 10%,rgba(26,84,135,.14),transparent),
  linear-gradient(135deg,#eef2f7,#e3eaf2);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:var(--muted)}
.ph svg{width:46px;height:46px;stroke:var(--navy-3);opacity:.5}
.ph b{font-size:15px;color:var(--steel);font-weight:600}
.ph span{font-size:12px;color:var(--muted-2)}

/* ===== 价值卡片 ===== */
.vals{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.val{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;transition:.3s;position:relative;overflow:hidden}
.val::after{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--accent),var(--gold));opacity:0;transition:.3s}
.val:hover{box-shadow:var(--shadow-md);transform:translateY(-4px)}
.val:hover::after{opacity:1}
.val .ic{width:56px;height:56px;border-radius:14px;background:linear-gradient(135deg,var(--navy),var(--navy-3));display:flex;align-items:center;justify-content:center;margin-bottom:18px;box-shadow:0 8px 18px rgba(10,42,73,.22)}
.val .ic svg{width:26px;height:26px;stroke:#fff;fill:none;stroke-width:1.8}
.val b{display:block;font-size:18px;color:var(--steel);margin-bottom:8px;font-weight:700}
.val p{font-size:14px;color:var(--muted);line-height:1.7}

/* ===== 场景 ===== */
.scenes{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.scene{background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px 14px;text-align:center;transition:.25s}
.scene:hover{border-color:var(--navy-3);box-shadow:var(--shadow-sm);transform:translateY(-3px)}
.scene svg{width:34px;height:34px;stroke:var(--navy-3);margin:0 auto 12px}
.scene b{display:block;font-size:15px;color:var(--steel);font-weight:600}

/* ===== 参数表 ===== */
.tbl{width:100%;border-collapse:collapse;background:#fff;font-size:15px;margin:16px 0;border-radius:12px;overflow:hidden;box-shadow:var(--shadow-sm)}
.tbl th,.tbl td{border:1px solid var(--line);padding:13px 16px;text-align:left;vertical-align:top}
.tbl th{background:linear-gradient(135deg,#f0f4f9,#eaf0f6);color:var(--navy);font-weight:700;width:150px;white-space:nowrap}
.tbl td b{color:var(--accent)}

/* ===== CTA 区 ===== */
.ctasec{position:relative;overflow:hidden;background:linear-gradient(120deg,#06182B,#0A2A49 55%,#12406B);color:#fff}
.ctasec::before{content:"";position:absolute;inset:0;background:radial-gradient(700px 400px at 90% 0%,rgba(26,84,135,.5),transparent 60%),repeating-linear-gradient(115deg,rgba(255,255,255,.02) 0,rgba(255,255,255,.02) 1px,transparent 1px,transparent 24px)}
.ctasec .wrap{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;padding:72px 24px;align-items:center}
.ctasec h2{font-size:32px;margin-bottom:14px;font-weight:800}
.ctasec p{color:#c3d4e6;font-size:15px;margin-bottom:10px}
.ctasec .hot{font-size:30px;font-weight:800;color:var(--gold);margin-top:8px}
.form{background:#fff;border-radius:16px;padding:28px;color:var(--steel);box-shadow:var(--shadow-lg)}
.form h3{color:var(--navy);font-size:19px;margin-bottom:16px;font-weight:700}
.form input,.form textarea{width:100%;border:1px solid var(--line);border-radius:8px;padding:12px 14px;margin-bottom:12px;font-size:14px;font-family:inherit;transition:.2s;background:#fbfcfe}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--navy-3);box-shadow:0 0 0 3px rgba(26,84,135,.12);background:#fff}
.form textarea{height:84px;resize:vertical}
.form button{width:100%;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border:0;border-radius:8px;padding:14px;font-size:16px;font-weight:700;cursor:pointer;letter-spacing:1px;box-shadow:0 8px 20px rgba(232,96,28,.3);transition:.2s}
.form button:hover{transform:translateY(-2px)}
.form .tips{font-size:12px;color:var(--muted);margin-top:10px;text-align:center}

/* ===== 页脚 ===== */
footer{background:#071A2C;color:#8fa6bd;font-size:13px}
footer .wrap{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;padding:52px 24px 40px}
footer h4{color:#fff;font-size:15px;margin-bottom:14px;font-weight:700}
footer a{display:block;margin-bottom:9px;transition:.2s}
footer a:hover{color:#fff}
footer .logo-line{font-size:22px;font-weight:800;color:#fff;margin-bottom:10px}
.copyright{border-top:1px solid #13304c;padding:16px 0;text-align:center;color:#6f8499}
.copyright a{color:#8fa6bd}

/* ===== 内页 ===== */
.breadcrumb{background:var(--gray);font-size:13px;color:var(--muted);padding:12px 0;border-bottom:1px solid var(--line)}
.breadcrumb a{color:var(--navy-3)}
.breadcrumb a:hover{color:var(--accent)}
.article{max-width:880px;margin:0 auto;font-size:16px}
.article h1{font-size:32px;color:var(--navy);margin-bottom:18px;font-weight:800;letter-spacing:.5px}
.article h2{color:var(--navy);font-size:23px;margin:32px 0 14px;font-weight:700;padding-left:14px;border-left:4px solid var(--accent)}
.article h3{color:var(--steel);font-size:18px;margin:22px 0 10px;font-weight:700}
.article p{margin-bottom:14px;color:#33424f}
.article ul,.article ol{margin:8px 0 18px 22px}
.article li{margin-bottom:8px;color:#33424f}
.article img{border-radius:12px;box-shadow:var(--shadow-sm)}
.article .grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:6px 0 18px}
.article .grid3 img{border-radius:10px}
.article .btn{display:inline-flex}

/* ===== 响应式 ===== */
@media(max-width:1000px){
  .scenes{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:900px){
  .hero .wrap,.ctasec .wrap{grid-template-columns:1fr;gap:32px}
  .hero .wrap{padding:56px 24px 60px}
  .hero h1{font-size:36px}
  .cats,.vals{grid-template-columns:1fr 1fr}
  .stats .wrap{grid-template-columns:repeat(2,1fr);gap:26px}
  .stats .it+.it::before{display:none}
  .menu{display:none}
  footer .wrap{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  .hero h1{font-size:30px}
  .sec{padding:60px 0}
  .sec-h h2{font-size:27px}
  .cats,.vals,.scenes{grid-template-columns:1fr}
  footer .wrap{grid-template-columns:1fr}
  .stats b{font-size:30px}
}

/* ===== 客户案例 ===== */
.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.case{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;display:flex;flex-direction:column}
.case:hover{box-shadow:var(--shadow-md);transform:translateY(-5px)}
.case .media{height:180px;overflow:hidden;position:relative;background:linear-gradient(135deg,#eef2f7,#e3eaf2)}
.case .media img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.case:hover .media img{transform:scale(1.06)}
.case .tag-t{position:absolute;top:14px;left:14px;background:rgba(10,42,73,.85);color:#fff;font-size:12px;padding:4px 12px;border-radius:20px;letter-spacing:1px}
.case .bd{padding:22px 24px 24px;flex:1;display:flex;flex-direction:column}
.case h3{font-size:18px;color:var(--navy);margin-bottom:8px;font-weight:700}
.case p{font-size:14px;color:var(--muted);margin-bottom:14px;flex:1}
.case .meta{display:flex;gap:16px;font-size:13px;color:var(--steel);font-weight:600;border-top:1px solid var(--line);padding-top:14px}
.case .meta b{color:var(--accent);font-size:18px}

/* ===== 资讯中心 ===== */
.news-list{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.news{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;transition:.3s;display:flex;gap:20px;align-items:flex-start}
.news:hover{box-shadow:var(--shadow-md);transform:translateY(-4px);border-color:#d7e0ea}
.news .date{flex:0 0 auto;text-align:center;background:linear-gradient(135deg,var(--navy),var(--navy-3));color:#fff;border-radius:10px;padding:12px 10px;min-width:64px}
.news .date b{display:block;font-size:24px;font-weight:800;line-height:1}
.news .date span{font-size:11px;color:#bcd0e4;letter-spacing:1px}
.news .info h3{font-size:17px;color:var(--navy);margin-bottom:8px;font-weight:700;line-height:1.5}
.news .info p{font-size:13px;color:var(--muted);margin-bottom:10px}
.news .info a{color:var(--accent);font-weight:700;font-size:13px}

/* ===== FAQ ===== */
.faq{max-width:820px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:14px;overflow:hidden;transition:.2s}
.faq-item:hover{border-color:#d7e0ea}
.faq-item details summary{cursor:pointer;list-style:none;padding:18px 22px;font-size:16px;font-weight:600;color:var(--steel);display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-item details summary::-webkit-details-marker{display:none}
.faq-item details summary::after{content:"+";font-size:22px;color:var(--accent);font-weight:700;transition:.25s;flex:0 0 auto}
.faq-item details[open] summary::after{transform:rotate(45deg)}
.faq-item details[open] summary{color:var(--navy)}
.faq-item .faq-a{padding:0 22px 20px;font-size:14px;color:var(--muted);line-height:1.8}
.faq-item .faq-a a{color:var(--accent);font-weight:600}

/* ===== 面包屑与文章 ===== */
.breadcrumb-schema{display:none}
.article .lead{font-size:17px;color:#33424f;background:var(--gray);border-left:4px solid var(--accent);padding:16px 20px;border-radius:8px;margin-bottom:22px}
.article .gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:6px 0 18px}
.article .gallery img{border-radius:10px}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}
.tag-row a{background:#eef3f8;color:var(--navy-2);font-size:13px;padding:6px 14px;border-radius:20px;font-weight:600;transition:.2s}
.tag-row a:hover{background:var(--navy);color:#fff}
.pager{display:flex;justify-content:space-between;margin-top:30px;padding-top:20px;border-top:1px solid var(--line)}
.pager a{color:var(--navy-3);font-size:14px;font-weight:600}
.pager a:hover{color:var(--accent)}
@media(max-width:900px){
  .cases,.news-list{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  .cases,.news-list{grid-template-columns:1fr}
}