/* ============================================================
   seal 密封与防漏材料平台 —— 明亮科技风样式
   设计令牌：深蓝 #0A2540 / 电光蓝 #1E6FFF / 青 #00C2FF
   ============================================================ */
:root{
  --navy:#0A2540;
  --navy-2:#0E3A6B;
  --blue:#1E6FFF;
  --cyan:#00C2FF;
  --bg:#F5F8FC;
  --white:#FFFFFF;
  --ink:#0A2540;
  --muted:#5A6B7B;
  --line:#E2EAF3;
  --ok:#16A34A;
  --warn:#F59E0B;
  --danger:#DC2626;
  --radius:16px;
  --shadow:0 10px 30px rgba(10,37,64,.08);
  --shadow-lg:0 18px 50px rgba(10,37,64,.16);
  --h2-inset:0px;            /* 面包屑与 H2 共用容器左缘 */
  --maxw:1180px;
  --header-h:64px;
  font-family:"PingFang SC","Microsoft YaHei","思源黑体",system-ui,sans-serif;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-size:16px;line-height:1.75;font-weight:400;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--blue);text-decoration:none;}
a:hover{color:var(--cyan);}
img{max-width:100%;height:auto;display:block;}
h1,h2,h3,h4{line-height:1.3;font-weight:700;color:var(--navy);}
h1{font-size:34px;margin:.2em 0 .5em;}
h2{font-size:24px;margin:1.6em 0 .6em;scroll-margin-top:84px;}
h3{font-size:19px;margin:1.3em 0 .5em;}
p{margin:.6em 0;}

/* ---------- 顶部固定导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;height:var(--header-h);z-index:100;
  background:rgba(10,37,64,.86);backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.header-inner{
  max-width:var(--maxw);margin:0 auto;height:100%;
  padding:0 22px;display:flex;align-items:center;justify-content:space-between;
}
.brand{display:flex;align-items:center;gap:10px;}
.brand-logo{border-radius:8px;}
.brand-text{color:#fff;font-weight:700;font-size:18px;letter-spacing:.3px;}
.brand-accent{color:#9FC4FF;font-weight:600;font-size:14px;}
.primary-nav{display:flex;gap:26px;}
.nav-link{color:#DCE8F7;font-size:15px;font-weight:500;position:relative;padding:6px 0;}
.nav-link:hover{color:#fff;}
.nav-link::after{content:"";position:absolute;left:0;bottom:-2px;height:2px;width:0;background:linear-gradient(90deg,var(--blue),var(--cyan));transition:width .25s;}
.nav-link:hover::after{width:100%;}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px;}
.nav-toggle span{width:24px;height:2px;background:#fff;border-radius:2px;transition:.25s;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
.mobile-menu{display:none;background:var(--navy);border-bottom:1px solid rgba(255,255,255,.08);padding:10px 22px 18px;}
.mobile-menu[hidden]{display:none;}
.mobile-menu:not([hidden]){display:block;}
.m-link,.m-group-toggle,.m-sublink{display:block;color:#DCE8F7;padding:10px 4px;border-bottom:1px solid rgba(255,255,255,.06);font-size:15px;}
.m-group-toggle{width:100%;text-align:left;background:none;border:0;color:#9FC4FF;cursor:pointer;font-weight:600;}
.m-group[hidden]{display:none;}
.m-sublink{padding-left:18px;color:#Bcd;}

/* ---------- 布局容器 ---------- */
.layout-shell{max-width:var(--maxw);margin:0 auto;padding:calc(var(--header-h) + 28px) 22px 60px;}
.breadcrumb{margin:0 0 18px;font-size:13.5px;color:var(--muted);}
.breadcrumb-list{list-style:none;display:flex;flex-wrap:wrap;gap:8px;padding:0;margin:0;}
.breadcrumb-item:not(:last-child)::after{content:"›";margin-left:8px;color:#B7C4D2;}
.breadcrumb-item a{color:var(--muted);}
.breadcrumb-item a:hover{color:var(--blue);}

/* ---------- 文章 / 产品双栏 ---------- */
.article-layout,.product-layout{
  display:grid;grid-template-columns:minmax(0,760px) 240px;gap:40px;align-items:start;
}
.article-main,.product-main{min-width:0;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:34px 36px;box-shadow:var(--shadow);}
.article-title,.product-title{font-size:32px;}
.product-lead{color:var(--muted);font-size:16px;margin-bottom:18px;}
.article-body{font-size:16px;}
.article-body img{border-radius:10px;margin:14px 0;}
.summary-block{background:linear-gradient(135deg,#EAF2FF,#F2FBFF);border-left:4px solid var(--blue);padding:16px 18px;border-radius:10px;color:var(--navy);font-weight:500;margin:18px 0;}
.keyword-line{font-size:14px;color:var(--muted);}
.update-time{font-size:13px;color:var(--muted);}

.cap-btn--icon svg{margin:0;}

/* 正文表格 .data 及内容区所有表格 */
table.data,.article-main table,.product-main table,.page-main table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;border:1px solid var(--line);}
table.data th,table.data td,.article-main table th,.article-main table td,.product-main table th,.product-main table td,.page-main table th,.page-main table td{border:1px solid var(--line);padding:10px 12px;text-align:left;}
table.data thead th,.article-main table thead th,.product-main table thead th,.page-main table thead th{background:var(--navy);color:#fff;font-weight:600;}
table.data tbody tr:nth-child(even),.article-main table tbody tr:nth-child(even),.product-main table tbody tr:nth-child(even),.page-main table tbody tr:nth-child(even){background:#F6F9FE;}

/* FAQ 裸 details */
.faq-section{margin-top:26px;}
.faq-heading{font-size:20px;}
.faq-item{background:#F6F9FE;border:1px solid var(--line);border-radius:12px;margin:10px 0;padding:0 16px;}
.faq-item summary{cursor:pointer;font-weight:600;padding:14px 0;color:var(--navy);}
.faq-item summary::-webkit-details-marker{color:var(--blue);}
.faq-item p{padding:0 0 14px;color:#33485c;}

/* 相关阅读 / 相关产品 */
.related{margin-top:26px;border-top:1px dashed var(--line);padding-top:16px;}
.related-list{list-style:none;padding:0;}
.related-list li{padding:8px 0;border-bottom:1px solid var(--line);}
.tag-text{display:inline-block;background:#EAF2FF;color:var(--blue);font-size:12.5px;padding:2px 10px;border-radius:999px;margin:2px 4px 2px 0;}

/* 右侧 TOC */
.toc-aside{position:sticky;top:calc(var(--header-h) + 20px);max-height:calc(100vh - 100px);overflow-y:auto;}
.toc-nav{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow);}
.toc-title{font-size:13px;color:var(--muted);margin:0 0 8px;font-weight:600;letter-spacing:.5px;}
.toc-nav ul{list-style:none;margin:0;padding-left:0;font-size:14px;}
.toc-nav li{margin:6px 0;}
.toc-nav a{color:var(--muted);}
.toc-nav a:hover{color:var(--blue);}

/* ---------- 列表 / 分类页 ---------- */
.list-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:34px;align-items:start;}
.cat-side{position:sticky;top:calc(var(--header-h) + 20px);background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);}
.cat-side-title{font-size:16px;margin:0 0 12px;}
.cat-details summary.cat-side-title{cursor:pointer;display:flex;align-items:center;justify-content:space-between;list-style:none;}
.cat-details summary.cat-side-title::-webkit-details-marker{display:none;}
.cat-details summary.cat-side-title::after{content:"▾";font-size:12px;color:var(--muted);transition:transform .2s ease;}
.cat-details[open] summary.cat-side-title::after{transform:rotate(180deg);}
.cat-details[open] summary.cat-side-title{margin-bottom:12px;}
.cat-details:not([open]) summary.cat-side-title{margin-bottom:0;}
.category-list{list-style:none;margin:0;padding:0;}
.cat-item{margin:2px 0;}
.cat-item a{display:block;padding:9px 12px;border-radius:10px;color:var(--ink);font-size:14.5px;}
.cat-item a:hover{background:#EAF2FF;}
.cat-item.active a{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;font-weight:600;}
.cat-content{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:26px 30px;box-shadow:var(--shadow);min-width:0;}
.list-title{font-size:28px;margin-top:0;}
.list-intro{color:var(--muted);}
.content-list{list-style:none;padding:0;margin:18px 0;}
.content-item{padding:16px 0;border-bottom:1px solid var(--line);}
.content-item-title{font-size:18px;font-weight:600;color:var(--navy);}
.content-item-desc{color:var(--muted);margin:6px 0;font-size:14.5px;}
.content-item-meta{font-size:13px;color:var(--muted);display:flex;gap:10px;align-items:center;flex-wrap:wrap;}
.pagination{display:flex;gap:8px;margin-top:20px;flex-wrap:wrap;}
.page-link{padding:8px 14px;border:1px solid var(--line);border-radius:10px;color:var(--ink);font-size:14px;}
.page-link.current{background:var(--navy);color:#fff;border-color:var(--navy);}
.page-link.disabled{opacity:.4;pointer-events:none;}

/* ---------- 首页 ---------- */
.hero{position:relative;overflow:hidden;border-radius:22px;margin-bottom:46px;color:#fff;}
.hero-bg{position:absolute;inset:0;background:radial-gradient(120% 120% at 80% 0%,#1E6FFF 0%,#0A2540 55%,#0A2540 100%);}
.hero-bg::after{content:"";position:absolute;right:-80px;top:-80px;width:360px;height:360px;border-radius:50%;background:radial-gradient(circle,rgba(0,194,255,.45),transparent 70%);}
.hero-inner{position:relative;padding:64px 48px;max-width:760px;}
.hero-eyebrow{display:inline-block;background:rgba(255,255,255,.16);padding:6px 14px;border-radius:999px;font-size:13px;letter-spacing:1px;margin:0 0 16px;color:#fff;border:1px solid rgba(255,255,255,.2);}
.hero-title{font-size:46px;margin:0 0 16px;font-weight:800;color:#fff;line-height:1.2;text-shadow:0 2px 14px rgba(0,0,0,.35);}
.hero-sub{font-size:18px;color:#fff;margin:0 0 26px;line-height:1.7;max-width:640px;text-shadow:0 1px 8px rgba(0,0,0,.35);}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;}
.btn{display:inline-block;padding:13px 26px;border-radius:12px;font-weight:600;font-size:15px;transition:.25s;cursor:pointer;}
.btn-primary{background:linear-gradient(135deg,var(--cyan),var(--blue));color:#fff;box-shadow:0 8px 24px rgba(30,111,255,.35);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(30,111,255,.45);color:#fff;}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.3);}
.btn-ghost:hover{background:rgba(255,255,255,.22);color:#fff;}
.hero-stats{display:flex;gap:34px;margin-top:36px;flex-wrap:wrap;}
.hero-stats li{list-style:none;}
.hero-stats strong{display:block;font-size:26px;color:#fff;}
.hero-stats span{font-size:13px;color:#A9C2E0;}

.section{margin:54px 0;}
.section-head{text-align:center;margin-bottom:30px;}
.section-title{font-size:30px;margin:0 0 10px;}
.section-desc{color:var(--muted);max-width:680px;margin:0 auto;font-size:15.5px;}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.core-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:.25s;position:relative;overflow:hidden;}
.core-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:#C9DCF5;}
.core-card-icon{display:block;width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--blue),var(--cyan));margin-bottom:14px;}
.core-card-title{font-size:19px;margin:0 0 8px;}
.core-card-desc{color:var(--muted);font-size:14px;margin:0 0 14px;}
.core-card-arrow{color:var(--blue);font-weight:600;font-size:14px;}
.scenario-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.scenario-card{background:linear-gradient(160deg,#fff,#F3F8FF);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);}
.scenario-title{font-size:18px;margin:0 0 8px;}
.scenario-desc{color:var(--muted);font-size:14.5px;}
.scenario-tag{margin-top:12px;font-size:13px;color:var(--blue);font-weight:600;}
.ability-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;}
.ability-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);}
.ability-card h3{margin-top:0;color:var(--blue);}
.ability-card p{color:#33485c;font-size:14.5px;}
.latest-list{list-style:none;padding:0;}
.latest-item{padding:16px 0;border-bottom:1px solid var(--line);}
.latest-title{font-size:18px;font-weight:600;color:var(--navy);}
.latest-desc{color:var(--muted);font-size:14.5px;margin:6px 0 0;}

/* ---------- 叶子页 ---------- */
.page-wrap{display:flex;justify-content:center;}
.page-main{max-width:820px;width:100%;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:40px 44px;box-shadow:var(--shadow);}
.page-title{font-size:32px;margin-top:0;}
.archive-list{columns:2;column-gap:30px;list-style:none;padding:0;}
.archive-list li{break-inside:avoid;padding:8px 0;border-bottom:1px solid var(--line);}
.notfound{text-align:center;padding:40px 0;}
.notfound-text{color:var(--muted);margin:10px 0 22px;}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--navy);color:#C9D6E6;margin-top:60px;}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:44px 22px 20px;display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:28px;}
.footer-name{color:#fff;font-weight:700;margin:8px 0;}
.footer-desc{font-size:14px;color:#9FB2C8;line-height:1.7;}
.footer-col h4{color:#fff;font-size:15px;margin:0 0 12px;}
.footer-col a,.footer-col p{display:block;color:#AFC2D8;font-size:14px;margin:7px 0;}
.footer-col a:hover{color:#fff;}
.footer-bottom{max-width:var(--maxw);margin:0 auto;padding:16px 22px;border-top:1px solid rgba(255,255,255,.08);display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:13px;color:#8DA3BC;}

/* ---------- 悬浮工具胶囊 ---------- */
.float-capsule{position:fixed;right:22px;top:50%;transform:translateY(-50%);z-index:120;display:flex;flex-direction:column;gap:10px;}
.cap-btn{display:flex;flex-direction:column;align-items:center;gap:3px;width:58px;height:58px;justify-content:center;border:0;border-radius:18px;cursor:pointer;
  background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;box-shadow:0 8px 22px rgba(30,111,255,.4);transition:.2s;}
.cap-btn:hover{transform:translateY(-3px) scale(1.04);box-shadow:0 12px 28px rgba(30,111,255,.55);}
.cap-label{font-size:11px;font-weight:600;}

.card-modal{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;}
.card-modal[hidden]{display:none;}
.card-modal-backdrop{position:absolute;inset:0;background:rgba(10,37,64,.6);backdrop-filter:blur(4px);}
.card-modal-box{position:relative;background:#fff;border-radius:16px;padding:18px;box-shadow:var(--shadow-lg);text-align:center;}
.card-modal-img{width:300px;height:500px;object-fit:contain;border-radius:8px;}
.card-modal-close{position:absolute;top:-12px;right:-12px;width:34px;height:34px;border-radius:50%;border:0;background:var(--navy);color:#fff;font-size:20px;cursor:pointer;line-height:1;}
.card-modal-tip{font-size:13px;color:var(--muted);margin:10px 0 0;}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .article-layout,.product-layout{grid-template-columns:1fr;}
  .toc-aside{position:static;max-height:none;margin-top:18px;}
  .toc-nav{box-shadow:none;}
  .card-grid,.scenario-grid,.ability-grid{grid-template-columns:1fr 1fr;}
  .footer-inner{grid-template-columns:1fr 1fr;}
  .archive-list{columns:1;}
}
@media (max-width:680px){
  .primary-nav{display:none;}
  .nav-toggle{display:flex;}
  .mobile-menu{display:none;}
  .mobile-menu:not([hidden]){display:block;}
  .list-layout{grid-template-columns:1fr;}
  .cat-side{position:static;}
  .card-grid,.scenario-grid,.ability-grid{grid-template-columns:1fr;}
  .footer-inner{grid-template-columns:1fr;}
  .hero-inner{padding:46px 26px;}
  .hero-title{font-size:32px;}
  h1{font-size:28px;}
  .article-main,.product-main,.cat-content,.page-main{padding:22px 18px;}
  .float-capsule{right:12px;}
  .cap-btn{width:50px;height:50px;}
  .card-modal-img{width:260px;height:433px;}
}