/* ===========================================================
   悦观察 YUE OBSERVER - 科技蓝新闻门户风格
   主色: #1657d6 / #2b6cf0   强调: #00b4ff   深色: #0b1e46
   =========================================================== */
:root{
  --blue:#1657d6; --blue2:#2b6cf0; --blue-l:#e8f0ff; --blue-d:#0b1e46;
  --cyan:#00b4ff; --ink:#1a2233; --gray:#6b7a90; --line:#e6ebf2;
  --bg:#f4f7fc; --white:#fff; --radius:8px;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",Arial,sans-serif;
  color:var(--ink);background:var(--bg);font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none;transition:color .2s}
a:hover{color:var(--blue)}
img{max-width:100%;vertical-align:middle;border:0}
ul,li{list-style:none}
.container{width:1200px;max-width:100%;margin:0 auto;padding:0 16px}
.fl{float:left}.fr{float:right}.clearfix::after{content:"";display:block;clear:both}
.br{border-radius:var(--radius);overflow:hidden}
.mb{margin-bottom:20px}
.ellipsis{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.multi{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.multi3{-webkit-line-clamp:3}
.hidden-sm-md-lg{}

/* ---------- 顶部工具条 ---------- */
.topbar{background:var(--blue-d);color:#c7d6f2;font-size:13px;height:36px;line-height:36px}
.topbar .container{display:flex;justify-content:space-between}
.topbar a{color:#c7d6f2}
.topbar a:hover{color:#fff}
.topbar .tb-l span{margin-right:16px;color:#8ea6d4}
.topbar .tb-r a{margin-left:18px}
.topbar .tb-r .cur{color:#8ea6d4}

/* ---------- 头部 ---------- */
.header{background:var(--white);box-shadow:0 2px 12px rgba(11,30,70,.06);position:sticky;top:0;z-index:999}
.h-wrap{display:flex;align-items:center;height:78px;gap:20px;position:relative}
.logo-area{flex-shrink:0}
.logo-area img{height:52px;display:block}
.pc-nav{flex:1;min-width:0}
.nav-ul{display:flex;gap:2px;flex-wrap:nowrap}
.nav-ul>li{position:relative;flex:0 0 auto}
.nav-ul>li>a{display:block;padding:0 15px;line-height:78px;font-size:16px;font-weight:500;color:var(--ink);position:relative;white-space:nowrap}
.nav-ul>li>a::after{content:"";position:absolute;left:15px;right:15px;bottom:18px;height:3px;border-radius:3px;background:var(--blue2);transform:scaleX(0);transition:transform .25s}
.nav-ul>li>a:hover::after,.nav-ul>li>a.active::after{transform:scaleX(1)}
.nav-ul>li>a.active{color:var(--blue)}
.sub-nav{position:absolute;top:78px;left:0;background:#fff;min-width:150px;box-shadow:0 8px 26px rgba(11,30,70,.14);
  border-radius:0 0 8px 8px;padding:8px 0;opacity:0;visibility:hidden;transform:translateY(8px);transition:.2s;z-index:99}
.nav-ul>li:hover .sub-nav{opacity:1;visibility:visible;transform:translateY(0)}
.sub-nav li a{display:block;padding:9px 20px;font-size:14.5px;color:var(--gray)}
.sub-nav li a:hover{background:var(--blue-l);color:var(--blue)}
.search-button{font-size:20px;color:var(--gray);cursor:pointer;padding:8px}
.search-button:hover{color:var(--blue)}
.search-area{display:none;position:absolute;top:78px;left:0;right:0;background:#fff;box-shadow:0 12px 30px rgba(11,30,70,.14);padding:16px;z-index:98}
.search-area.open{display:block}
.searchform{display:flex;gap:10px}
.searchform input{flex:1;height:46px;border:1px solid var(--line);border-radius:24px;padding:0 22px;font-size:15px;outline:none}
.searchform input:focus{border-color:var(--blue2)}
.s-button{height:46px;padding:0 34px;border:0;border-radius:24px;background:var(--blue);color:#fff;font-size:15px;cursor:pointer}
.s-button:hover{background:var(--blue2)}
.m-nav-btn{display:none;font-size:22px;cursor:pointer;color:var(--ink)}

/* ---------- 版块标题 ---------- */
.sec-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;border-bottom:2px solid var(--line);padding-bottom:12px}
.sec-head .t{display:flex;align-items:baseline;gap:12px}
.sec-head .t h2{font-size:22px;font-weight:700;color:var(--ink);position:relative;padding-left:16px}
.sec-head .t h2::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:5px;border-radius:3px;background:linear-gradient(180deg,var(--blue2),var(--cyan))}
.sec-head .t em{font-style:normal;font-size:13px;color:var(--gray);letter-spacing:1px}
.sec-head .more{font-size:13.5px;color:var(--gray)}
.sec-head .more:hover{color:var(--blue)}

/* ---------- 首页英雄区 ---------- */
.hero{display:grid;grid-template-columns:1fr 380px;gap:20px;margin:24px 0}
.hero-main{position:relative;border-radius:12px;overflow:hidden;background:#000;min-height:420px;grid-row:span 1}
.hero-main img{width:100%;height:420px;object-fit:cover;display:block;opacity:.92}
.hero-main .mask{position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(6,18,44,.88))}
.hero-main .cap{position:absolute;left:0;right:0;bottom:0;padding:26px 30px}
.hero-main .tag{display:inline-block;background:var(--blue2);color:#fff;font-size:13px;padding:4px 12px;border-radius:4px;margin-bottom:12px}
.hero-main h3{color:#fff;font-size:27px;font-weight:700;line-height:1.4;margin-bottom:8px}
.hero-main h3 a{color:#fff}
.hero-main p{color:#c9d6ec;font-size:14px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.hero-side{display:grid;grid-template-rows:repeat(3,1fr);gap:16px}
.hero-side .item{display:flex;gap:14px;background:#fff;border-radius:10px;padding:12px;box-shadow:0 2px 12px rgba(11,30,70,.05);transition:.2s}
.hero-side .item:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(11,30,70,.12)}
.hero-side .item .th{width:132px;height:88px;flex-shrink:0;overflow:hidden;border-radius:8px}
.hero-side .item .th img{width:100%;height:100%;object-fit:cover;transition:.4s}
.hero-side .item:hover .th img{transform:scale(1.06)}
.hero-side .item .tx{display:flex;flex-direction:column;justify-content:space-between;min-width:0;flex:1}
.hero-side .item h4{font-size:15.5px;font-weight:600;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.hero-side .item .m{font-size:12.5px;color:var(--gray)}
.hero-side .item .m .cat{color:var(--blue)}

/* ---------- 首页区块(图文混排) ---------- */
.block{background:#fff;border-radius:12px;padding:22px;margin-bottom:24px;box-shadow:0 2px 12px rgba(11,30,70,.05)}
.block-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{display:flex;flex-direction:column}
.card .th{border-radius:8px;overflow:hidden;aspect-ratio:16/10;background:var(--blue-l)}
.card .th img{width:100%;height:100%;object-fit:cover;transition:.4s}
.card:hover .th img{transform:scale(1.05)}
.card h4{font-size:16px;font-weight:600;line-height:1.5;margin:12px 0 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card p{font-size:13.5px;color:var(--gray);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card .m{margin-top:10px;font-size:12.5px;color:#93a1b8;display:flex;gap:14px}
.card .m .cat{color:var(--blue);font-weight:500}

/* 左图右列表 */
.block-flex{display:grid;grid-template-columns:1.35fr 1fr;gap:24px}
.bl-list{display:flex;flex-direction:column;gap:14px}
.bl-list .row{display:flex;gap:14px;padding-bottom:14px;border-bottom:1px dashed var(--line)}
.bl-list .row:last-child{border:0;padding-bottom:0}
.bl-list .row .th{width:150px;height:96px;flex-shrink:0;border-radius:8px;overflow:hidden;background:var(--blue-l)}
.bl-list .row .th img{width:100%;height:100%;object-fit:cover;transition:.4s}
.bl-list .row:hover .th img{transform:scale(1.06)}
.bl-list .row h4{font-size:16px;font-weight:600;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.bl-list .row p{font-size:13.5px;color:var(--gray);margin-top:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.bl-list .row .m{font-size:12.5px;color:#93a1b8;margin-top:8px}

/* 首条大图(区块内) */
.feat{position:relative;border-radius:10px;overflow:hidden}
.feat img{width:100%;height:100%;min-height:322px;object-fit:cover;display:block;opacity:.94}
.feat .mask{position:absolute;inset:0;background:linear-gradient(180deg,transparent 45%,rgba(6,18,44,.86))}
.feat .cap{position:absolute;left:0;right:0;bottom:0;padding:18px 20px}
.feat .cap h4{color:#fff;font-size:18px;font-weight:600;line-height:1.45}
.feat .cap .m{color:#bccbe6;font-size:12.5px;margin-top:6px}

/* ---------- 文章列表页 ---------- */
.page-head{background:linear-gradient(120deg,var(--blue-d),var(--blue) 120%);border-radius:12px;padding:26px 30px;color:#fff;margin:24px 0}
.page-head h1{font-size:26px;font-weight:700}
.page-head p{color:#c9d9f5;font-size:14px;margin-top:8px}
.breadcrumb{font-size:13.5px;color:var(--gray);padding:16px 0}
.breadcrumb a{color:var(--gray)}
.breadcrumb a:hover{color:var(--blue)}
.layout{display:grid;grid-template-columns:1fr 340px;gap:24px;align-items:start}
.mainbox{min-width:0}
.news-list{background:#fff;border-radius:12px;padding:10px 22px;box-shadow:0 2px 12px rgba(11,30,70,.05)}
.news-list .row{display:flex;gap:18px;padding:18px 0;border-bottom:1px solid var(--line)}
.news-list .row:last-child{border:0}
.news-list .th{width:200px;height:126px;flex-shrink:0;border-radius:8px;overflow:hidden;background:var(--blue-l)}
.news-list .th img{width:100%;height:100%;object-fit:cover;transition:.4s}
.news-list .row:hover .th img{transform:scale(1.06)}
.news-list .tx{min-width:0;flex:1}
.news-list .tx h2{font-size:18px;font-weight:600;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-list .tx .intro{font-size:14px;color:var(--gray);margin:10px 0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-list .tx .data{font-size:12.5px;color:#93a1b8;display:flex;gap:16px;flex-wrap:wrap}
.news-list .tx .data .cat{color:var(--blue);font-weight:500}

/* 分页 */
.pagebar{margin:26px 0;text-align:center}
.nav-links{display:inline-flex;gap:8px;flex-wrap:wrap;justify-content:center}
.nav-links a,.nav-links span{display:inline-block;min-width:38px;height:38px;line-height:36px;padding:0 12px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:14px;color:var(--ink)}
.nav-links a:hover{border-color:var(--blue2);color:var(--blue)}
.nav-links .current{background:var(--blue);border-color:var(--blue);color:#fff}

/* ---------- 侧栏 ---------- */
.widget{background:#fff;border-radius:12px;padding:18px;margin-bottom:20px;box-shadow:0 2px 12px rgba(11,30,70,.05)}
.widget .wtitle{font-size:17px;font-weight:700;padding-bottom:12px;margin-bottom:12px;border-bottom:2px solid var(--line);position:relative}
.widget .wtitle::before{content:"";position:absolute;left:0;bottom:-2px;width:44px;height:2px;background:var(--blue2)}
.hot-list li{display:flex;gap:10px;padding:10px 0;border-bottom:1px dashed var(--line)}
.hot-list li:last-child{border:0}
.hot-list .no{width:20px;height:20px;line-height:20px;text-align:center;border-radius:5px;background:var(--blue-l);color:var(--blue);font-size:12px;font-weight:700;flex-shrink:0;margin-top:3px}
.hot-list li:nth-child(1) .no{background:var(--blue2);color:#fff}
.hot-list li:nth-child(2) .no{background:#4f8cf5;color:#fff}
.hot-list li:nth-child(3) .no{background:#7ba7f7;color:#fff}
.hot-list .t{font-size:14px;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.tagcloud{display:flex;flex-wrap:wrap;gap:8px}
.tagcloud a{font-size:13px;padding:5px 12px;background:var(--bg);border-radius:16px;color:var(--gray)}
.tagcloud a:hover{background:var(--blue);color:#fff}
.about-box .bg{height:96px;border-radius:8px;background:linear-gradient(120deg,var(--blue-d),var(--blue2));margin-bottom:-36px}
.about-box .av{width:72px;height:72px;border-radius:50%;border:4px solid #fff;background:var(--blue-d);margin:0 auto;display:flex;align-items:center;justify-content:center;color:#fff;font-size:30px;font-weight:700;position:relative}
.about-box .nm{text-align:center;font-size:18px;font-weight:700;margin-top:8px}
.about-box .ds{text-align:center;font-size:13px;color:var(--gray);margin-top:6px;line-height:1.6}

/* ---------- 文章详情 ---------- */
.art-main{background:#fff;border-radius:12px;padding:34px 40px;box-shadow:0 2px 12px rgba(11,30,70,.05)}
.art-head h1.art-title{font-size:30px;font-weight:700;line-height:1.45;margin-bottom:18px}
.head-info{display:flex;gap:20px;font-size:13.5px;color:var(--gray);padding-bottom:18px;border-bottom:1px solid var(--line);margin-bottom:24px;flex-wrap:wrap}
.head-info .cat{color:var(--blue);font-weight:500}
.art-content{font-size:16.5px;line-height:1.95;color:#2b3547}
.art-content p{margin:0 0 20px}
.art-content h3{font-size:20px;font-weight:700;margin:30px 0 16px;padding-left:14px;border-left:4px solid var(--blue2);line-height:1.4}
.art-content img{border-radius:10px;margin:6px 0}
.art-content a{color:var(--blue)}
.art-content strong{color:var(--ink)}
.art-content code{background:var(--blue-l);color:var(--blue);padding:1px 8px;border-radius:5px;font-size:14px}
.art-copyright{margin-top:30px;padding:16px 18px;background:var(--bg);border-radius:10px;font-size:13px;color:var(--gray);line-height:1.9}
.art-copyright a{color:var(--blue)}
.prev-next{display:flex;gap:16px;margin-top:20px}
.prev-next p{flex:1;background:#fff;border-radius:10px;padding:14px 18px;font-size:14px;box-shadow:0 2px 12px rgba(11,30,70,.05);overflow:hidden}
.related-art{background:#fff;border-radius:12px;padding:22px;margin-top:20px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.related-grid .item .th{aspect-ratio:16/10;border-radius:8px;overflow:hidden;background:var(--blue-l)}
.related-grid .item .th img{width:100%;height:100%;object-fit:cover}
.related-grid .item h4{font-size:14.5px;font-weight:600;margin-top:10px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- 页脚 ---------- */
.footer{background:var(--blue-d);color:#a9bcdd;margin-top:40px;padding:40px 0 24px}
.footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px}
.footer .title{color:#fff;font-size:16px;font-weight:600;margin-bottom:14px}
.footer .intro{font-size:13.5px;line-height:1.9;color:#93a6c9}
.footer .f-contact p{font-size:13.5px;line-height:2.1}
.footer .f-contact i{margin-right:6px}
.footer .f-qr img{width:108px;height:108px;border-radius:8px;background:#fff;padding:5px}
.footer .cpy{margin-top:28px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;text-align:center;color:#8ea2c6}
.footer a{color:#a9bcdd}.footer a:hover{color:#fff}
.toolbar{position:fixed;right:20px;bottom:60px;z-index:900;display:flex;flex-direction:column;gap:10px}
.toolbar .btn{width:46px;height:46px;line-height:46px;text-align:center;background:#fff;border-radius:10px;box-shadow:0 4px 16px rgba(11,30,70,.14);color:var(--gray);cursor:pointer;position:relative}
.toolbar .btn:hover{background:var(--blue);color:#fff}
.toolbar .btn i{font-size:20px}
#qr-img{position:absolute;right:56px;top:0;width:120px;height:120px;border-radius:10px;background:#fff;padding:6px;box-shadow:0 4px 16px rgba(11,30,70,.18);display:none}
#qr:hover #qr-img{display:block}
#totop{display:none}

/* ---------- 响应式 ---------- */
@media(max-width:992px){
  .container{width:100%}
  .hidden-sm-md-lg{display:none!important}
  .hero{grid-template-columns:1fr}
  .hero-side{grid-template-rows:none;grid-template-columns:1fr}
  .block-grid{grid-template-columns:1fr 1fr}
  .block-flex{grid-template-columns:1fr}
  .layout{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr;gap:24px}
  .pc-nav{display:none}
  .m-nav-btn{display:block}
  .header.nav-toggle-open .pc-nav{display:block;position:absolute;top:78px;left:0;right:0;background:#fff;box-shadow:0 12px 30px rgba(11,30,70,.14);padding:8px 0}
  .header.nav-toggle-open .nav-ul{flex-direction:column}
  .header.nav-toggle-open .nav-ul>li>a{line-height:46px;padding:0 22px}
  .header.nav-toggle-open .nav-ul>li>a::after{display:none}
  .header.nav-toggle-open .sub-nav{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;padding-left:14px}
}
@media(max-width:640px){
  .block-grid{grid-template-columns:1fr}
  .hero-main img{height:260px}
  .hero-main h3{font-size:20px}
  .news-list .row{flex-direction:column}
  .news-list .th{width:100%;height:190px}
  .art-main{padding:22px 18px}
  .art-head h1.art-title{font-size:23px}
  .related-grid{grid-template-columns:1fr}
  .bl-list .row .th{width:120px;height:80px}
  .footer .cols{grid-template-columns:1fr}
}