*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
--blue-deep:#1A3C7E;--blue:#2563A8;--blue-light:#EBF4FF;--blue-50:#F0F6FF;
--red:#C8102E;--red-light:#FFF1F1;--red-dark:#A00D24;
--white:#FFFFFF;--bg-gray:#F7FAFC;--bg-gray2:#EEF2F7;
--text:#1A202C;--text-gray:#4A5568;--text-light:#718096;
--border:#E2E8F0;--radius:12px;--radius-sm:8px;
--shadow:0 2px 12px rgba(26,60,126,.08);--shadow-lg:0 8px 30px rgba(26,60,126,.12);
--transition:all .3s cubic-bezier(.4,0,.2,1);--container:1200px
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);line-height:1.7;background:var(--white);overflow-x:hidden;font-size:15px}
a{color:inherit;text-decoration:none;transition:var(--transition)}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--container);margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:28px;color:var(--blue-deep);font-weight:700;margin-bottom:10px}
.section-title .subtitle{color:var(--text-gray);font-size:15px}
.section-title .divider{width:50px;height:3px;background:linear-gradient(90deg,var(--red),var(--blue));margin:12px auto 0;border-radius:2px}

/* ===== Navigation ===== */
.header{position:fixed;top:0;left:0;right:0;z-index:999;background:rgba(255,255,255,.98);box-shadow:0 1px 6px rgba(0,0,0,.06);transition:var(--transition)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{font-size:20px;font-weight:700;color:var(--blue-deep);white-space:nowrap;display:flex;align-items:center}
.nav-logo-img{height:44px;width:auto;display:block}
.nav-menu{display:flex;align-items:center;list-style:none;gap:4px}
.nav-menu>li{position:relative}
.nav-menu>li>a{display:block;padding:0 14px;line-height:64px;font-size:15px;font-weight:500;color:var(--text)}
.nav-menu>li>a:hover,.nav-menu>li>a.active{color:var(--red)}
.nav-menu>li>a::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:0;height:2px;background:var(--red);transition:var(--transition)}
.nav-menu>li>a:hover::after,.nav-menu>li>a.active::after{width:60%}
.nav-dropdown{position:absolute;top:64px;left:50%;transform:translateX(-50%) translateY(10px);background:var(--white);box-shadow:var(--shadow-lg);border-radius:var(--radius-sm);min-width:200px;padding:10px 0;opacity:0;visibility:hidden;transition:var(--transition)}
.nav-menu>li:hover .nav-dropdown{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.nav-dropdown a{display:block;padding:8px 20px;font-size:14px;color:var(--text-gray)}
.nav-dropdown a:hover{color:var(--red);background:var(--blue-50)}
.nav-dropdown a.current{color:var(--red);font-weight:600}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:var(--blue-deep);transition:var(--transition)}
.nav-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* ===== Breadcrumb ===== */
.breadcrumb{margin-top:64px;background:var(--bg-gray);padding:12px 0;border-bottom:1px solid var(--border)}
.breadcrumb-list{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-light);flex-wrap:wrap}
.breadcrumb-list a{color:var(--blue);transition:var(--transition)}
.breadcrumb-list a:hover{color:var(--red)}
.breadcrumb-sep{color:var(--text-light)}

/* ===== Article Detail Layout ===== */
.article-detail-section{padding:40px 0 60px}
.article-layout{display:grid;grid-template-columns:1fr 320px;gap:32px;align-items:flex-start}

/* Article Header */
.article-header{margin-bottom:32px;padding-bottom:24px;border-bottom:2px solid var(--border)}
.article-cat-badge{display:inline-block;padding:4px 14px;border-radius:16px;font-size:13px;font-weight:600;margin-bottom:16px;background:var(--blue-light);color:var(--blue-deep)}
.article-header h1{font-size:30px;color:var(--text);line-height:1.4;margin-bottom:16px;font-weight:700}
.article-meta{display:flex;flex-wrap:wrap;gap:20px;font-size:13px;color:var(--text-light);align-items:center}
.article-meta span{display:flex;align-items:center;gap:5px}
.article-meta svg{width:15px;height:15px;opacity:.6}

/* Table of Contents */
.toc-box{background:var(--blue-50);border-radius:var(--radius);padding:20px 24px;margin-bottom:32px;border-left:4px solid var(--blue)}
.toc-box h3{font-size:15px;color:var(--blue-deep);margin-bottom:12px;display:flex;align-items:center;gap:6px}
.toc-box h3 svg{width:18px;height:18px}
.toc-list{list-style:none;counter-reset:toc}
.toc-list li{padding:5px 0 5px 28px;position:relative;font-size:14px}
.toc-list li::before{counter-increment:toc;content:counter(toc);position:absolute;left:0;top:5px;width:20px;height:20px;background:var(--blue);color:var(--white);border-radius:50%;font-size:11px;display:flex;align-items:center;justify-content:center;font-weight:600}
.toc-list li a{color:var(--text-gray);transition:var(--transition)}
.toc-list li a:hover{color:var(--red)}
.toc-list li.sub{padding-left:48px;font-size:13px}
.toc-list li.sub::before{display:none}
.toc-list li.sub::after{content:'·';position:absolute;left:28px;top:5px;color:var(--blue);font-weight:bold}

/* Article Body */
.article-body{font-size:16px;line-height:1.85;color:var(--text)}
.article-body h2{font-size:24px;color:var(--blue-deep);margin:36px 0 16px;padding-bottom:8px;border-bottom:2px solid var(--blue-50);font-weight:700}
.article-body h3{font-size:19px;color:var(--text);margin:28px 0 12px;font-weight:600;padding-left:12px;border-left:4px solid var(--red)}
.article-body h4{font-size:16px;color:var(--blue-deep);margin:20px 0 10px;font-weight:600}
.article-body p{margin-bottom:16px;color:var(--text-gray)}
.article-body strong{color:var(--text);font-weight:600}
.article-body ul,.article-body ol{margin:12px 0 20px;padding-left:24px}
.article-body li{margin-bottom:8px;color:var(--text-gray);line-height:1.75}
.article-body blockquote{background:var(--blue-50);border-left:4px solid var(--blue);padding:16px 20px;margin:20px 0;border-radius:0 var(--radius-sm) var(--radius-sm) 0}
.article-body blockquote p{margin-bottom:0;color:var(--blue-deep);font-style:italic}

/* Article Info Cards */
.info-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;margin:20px 0;box-shadow:var(--shadow)}
.info-card-title{font-size:15px;font-weight:600;color:var(--blue-deep);margin-bottom:12px;display:flex;align-items:center;gap:6px}
.info-card-title svg{width:18px;height:18px;flex-shrink:0}

/* Exam Stage Cards */
.exam-stage{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}
.exam-stage-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border-top:4px solid var(--blue-deep)}
.exam-stage-card:nth-child(2){border-top-color:var(--blue)}
.exam-stage-card:nth-child(3){border-top-color:var(--red)}
.exam-stage-card-header{padding:14px 16px;text-align:center}
.exam-stage-card:nth-child(1) .exam-stage-card-header{background:linear-gradient(135deg,#1A3C7E,#2563A8);color:var(--white)}
.exam-stage-card:nth-child(2) .exam-stage-card-header{background:linear-gradient(135deg,#2563A8,#3B82C4);color:var(--white)}
.exam-stage-card:nth-child(3) .exam-stage-card-header{background:linear-gradient(135deg,#C8102E,#E84042);color:var(--white)}
.exam-stage-card-header h4{font-size:16px;margin-bottom:2px}
.exam-stage-card-header p{font-size:12px;opacity:.85}
.exam-stage-card-body{padding:14px 16px;font-size:13px}
.exam-stage-card-body dl{margin:0}
.exam-stage-card-body dt{font-weight:600;color:var(--text-light);font-size:12px;margin-top:8px}
.exam-stage-card-body dt:first-child{margin-top:0}
.exam-stage-card-body dd{color:var(--text);font-size:13px;margin-bottom:4px}

/* Comparison Table */
.cmp-table{width:100%;border-collapse:collapse;font-size:14px;margin:20px 0;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.cmp-table th{background:var(--blue-deep);color:var(--white);padding:12px 14px;text-align:left;font-weight:600;font-size:13px}
.cmp-table td{padding:10px 14px;border-bottom:1px solid var(--border);color:var(--text-gray)}
.cmp-table tr:last-child td{border-bottom:none}
.cmp-table tr:hover td{background:var(--blue-50)}
.cmp-table td:first-child{font-weight:600;color:var(--blue-deep)}

/* Tip Box */
.tip-box{background:var(--red-light);border-left:4px solid var(--red);padding:16px 20px;margin:20px 0;border-radius:0 var(--radius-sm) var(--radius-sm) 0}
.tip-box-title{font-size:14px;font-weight:600;color:var(--red-dark);margin-bottom:6px;display:flex;align-items:center;gap:6px}
.tip-box-title svg{width:16px;height:16px}
.tip-box p{font-size:14px;color:var(--text-gray);margin-bottom:0}

/* Warning Box */
.warn-box{background:#FFF8E1;border-left:4px solid #F9A825;padding:16px 20px;margin:20px 0;border-radius:0 var(--radius-sm) var(--radius-sm) 0}
.warn-box-title{font-size:14px;font-weight:600;color:#E65100;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.warn-box-title svg{width:16px;height:16px}
.warn-box p{font-size:14px;color:var(--text-gray);margin-bottom:0}

/* SVG Figure */
.figure-box{margin:24px 0;text-align:center}
.figure-box svg{width:100%;max-width:680px;height:auto;display:block;margin:0 auto}
.figure-caption{font-size:13px;color:var(--text-light);margin-top:8px;text-align:center}

/* Timeline */
.timeline-box{position:relative;padding-left:32px;margin:24px 0}
.timeline-box::before{content:'';position:absolute;left:8px;top:0;bottom:0;width:2px;background:linear-gradient(180deg,var(--blue-deep),var(--blue),var(--red))}
.timeline-item{position:relative;margin-bottom:20px}
.timeline-item:last-child{margin-bottom:0}
.timeline-item::before{content:'';position:absolute;left:-28px;top:4px;width:12px;height:12px;border-radius:50%;background:var(--white);border:3px solid var(--blue);z-index:1}
.timeline-item:nth-child(3)::before{border-color:var(--red)}
.timeline-item h4{font-size:15px;color:var(--blue-deep);margin-bottom:4px}
.timeline-item p{font-size:14px;color:var(--text-gray);margin-bottom:0}

/* Article Tags */
.article-tags{display:flex;flex-wrap:wrap;gap:8px;margin:28px 0;padding-top:24px;border-top:1px solid var(--border)}
.article-tags-label{font-size:14px;color:var(--text-light);line-height:28px;margin-right:4px}
.article-tags a{padding:4px 12px;border-radius:14px;font-size:13px;color:var(--blue);background:var(--blue-50);transition:var(--transition)}
.article-tags a:hover{background:var(--blue);color:var(--white)}

/* Share Box */
.share-box{display:flex;align-items:center;gap:12px;padding:20px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin:24px 0}
.share-box-label{font-size:14px;color:var(--text-light);font-weight:500}
.share-box a{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:var(--transition)}
.share-box a:hover{transform:translateY(-2px)}
.share-box a svg{width:18px;height:18px}
.share-box .share-wechat{background:#07C160}
.share-box .share-wechat svg{fill:var(--white)}
.share-box .share-weibo{background:#E6162D}
.share-box .share-weibo svg{fill:var(--white)}
.share-box .share-link{background:var(--blue-50)}
.share-box .share-link svg{fill:var(--blue)}

/* Article Nav (prev/next) */
.article-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:28px 0}
.article-nav-item{background:var(--bg-gray);border-radius:var(--radius);padding:16px 20px;transition:var(--transition);display:flex;flex-direction:column}
.article-nav-item:hover{background:var(--blue-50);transform:translateY(-2px)}
.article-nav-item.next{text-align:right;align-items:flex-end}
.article-nav-label{font-size:12px;color:var(--text-light);margin-bottom:4px}
.article-nav-item h4{font-size:14px;color:var(--blue-deep);line-height:1.4;font-weight:500}

/* ===== Sidebar ===== */
.sidebar{position:sticky;top:80px}
.widget{background:var(--white);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin-bottom:20px}
.widget h3{font-size:16px;color:var(--blue-deep);margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--border);position:relative}
.widget h3::after{content:'';position:absolute;bottom:-2px;left:0;width:40px;height:2px;background:var(--red)}

/* Hot Articles Widget */
.hot-list{list-style:none}
.hot-list li{display:flex;align-items:flex-start;gap:10px;padding:10px 0;border-bottom:1px dashed var(--border)}
.hot-list li:last-child{border-bottom:none}
.hot-num{width:24px;height:24px;flex-shrink:0;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:var(--white)}
.hot-num.top1{background:var(--red)}
.hot-num.top2{background:#E84042}
.hot-num.top3{background:var(--blue)}
.hot-num.top4,.hot-num.top5{background:var(--text-light)}
.hot-list li a{font-size:13px;color:var(--text);line-height:1.5}
.hot-list li a:hover{color:var(--red)}

/* Tag Cloud Widget */
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-cloud a{padding:5px 12px;border-radius:16px;font-size:13px;color:var(--text-gray);background:var(--bg-gray);transition:var(--transition)}
.tag-cloud a:hover{background:var(--blue-light);color:var(--blue-deep)}

/* Course Links Widget */
.course-links{list-style:none}
.course-links .cl-group{margin-bottom:12px}
.course-links .cl-title{font-size:13px;font-weight:600;color:var(--text);margin-bottom:6px}
.course-links .cl-items{display:flex;flex-wrap:wrap;gap:6px}
.course-links .cl-items a{padding:3px 10px;border-radius:12px;font-size:12px;color:var(--blue);background:var(--blue-50);transition:var(--transition)}
.course-links .cl-items a:hover{background:var(--blue);color:var(--white)}

/* CTA Widget */
.cta-widget{background:linear-gradient(135deg,var(--blue-deep),var(--blue));border-radius:var(--radius);padding:24px;text-align:center;color:var(--white)}
.cta-widget h3{color:var(--white);border:none;font-size:17px;margin-bottom:8px}
.cta-widget p{font-size:13px;opacity:.85;margin-bottom:14px}
.cta-widget .cta-btn{display:inline-block;padding:10px 28px;background:var(--red);color:var(--white);border-radius:20px;font-size:14px;font-weight:600;transition:var(--transition)}
.cta-widget .cta-btn:hover{background:var(--red-dark);transform:translateY(-2px)}

/* ===== Related Articles ===== */
.related-section{background:var(--bg-gray)}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.related-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition);display:flex;flex-direction:column}
.related-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.related-card-thumb{height:140px;position:relative;overflow:hidden;background:linear-gradient(135deg,#1A3C7E,#2563A8)}
.related-card-thumb img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s ease}
.related-card:hover .related-card-thumb img{transform:scale(1.05)}
.related-card-cat{position:absolute;top:8px;left:8px;padding:3px 10px;border-radius:12px;font-size:11px;font-weight:600;color:var(--white);backdrop-filter:blur(4px)}
.related-card-body{padding:16px;flex:1;display:flex;flex-direction:column}
.related-card-body h3{font-size:15px;color:var(--text);margin-bottom:8px;line-height:1.4}
.related-card-body h3 a{color:inherit}
.related-card-body h3 a:hover{color:var(--red)}
.related-card-body p{font-size:13px;color:var(--text-gray);line-height:1.6;margin-bottom:10px;flex:1}
.related-card-meta{display:flex;gap:12px;font-size:12px;color:var(--text-light)}

/* ===== Internal Links: Certification Navigation ===== */
.cert-nav-section{background:var(--white)}
.cert-nav-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.cert-nav-card{background:var(--bg-gray);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.cert-nav-card-header{padding:18px 20px;color:var(--white)}
.cert-nav-card:nth-child(1) .cert-nav-card-header{background:linear-gradient(135deg,#1A3C7E,#2563A8)}
.cert-nav-card:nth-child(2) .cert-nav-card-header{background:linear-gradient(135deg,#2563A8,#3B82C4)}
.cert-nav-card:nth-child(3) .cert-nav-card-header{background:linear-gradient(135deg,#C8102E,#E84042)}
.cert-nav-card-header h3{font-size:17px;margin-bottom:4px}
.cert-nav-card-header p{font-size:13px;opacity:.85}
.cert-nav-card-body{padding:16px 20px}
.cert-nav-card-body a{display:flex;align-items:center;justify-content:space-between;padding:10px 0;border-bottom:1px dashed var(--border);font-size:14px;color:var(--text)}
.cert-nav-card-body a:last-child{border-bottom:none}
.cert-nav-card-body a:hover{color:var(--red)}
.cert-nav-card-body a span{font-size:12px;color:var(--text-light)}
.cert-nav-card-body a:hover span{color:var(--red)}

/* ===== Footer ===== */
.footer{background:#0F1B3D;color:rgba(255,255,255,.75);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-col h4{font-size:15px;color:var(--white);margin-bottom:14px;font-weight:600}
.footer-col p{font-size:13px;line-height:1.7;margin-bottom:6px}
.footer-col ul{list-style:none}
.footer-col ul li{padding:4px 0;font-size:13px}
.footer-col ul li a{color:rgba(255,255,255,.7);transition:var(--transition)}
.footer-col ul li a:hover{color:var(--white)}
.footer-col .footer-sub-title{font-size:13px;color:rgba(255,255,255,.5);margin-top:10px;margin-bottom:4px}
.footer-contact p{display:flex;align-items:flex-start;gap:8px;font-size:13px;margin-bottom:6px}
.footer-contact svg{width:16px;height:16px;flex-shrink:0;margin-top:3px;opacity:.7}
.footer-qr{text-align:center;margin-top:10px}
.footer-qr .qr-box{width:100px;height:100px;background:rgba(255,255,255,.1);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;margin:0 auto 6px}
.footer-qr .qr-box svg{width:60px;height:60px;opacity:.8}
.footer-qr p{font-size:12px;text-align:center}
.footer-bottom{padding:20px 0;text-align:center}
.footer-bottom p{font-size:12px;color:rgba(255,255,255,.5);margin-bottom:4px;line-height:1.6}
.footer-trademark{margin-top:8px;padding-top:10px;border-top:1px solid rgba(255,255,255,.08)}

/* ===== Responsive ===== */
@media(max-width:1024px){
.article-layout{grid-template-columns:1fr}
.sidebar{position:static;display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.sidebar .widget{margin-bottom:0}
.exam-stage{grid-template-columns:1fr}
.related-grid{grid-template-columns:repeat(2,1fr)}
.cert-nav-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
.section{padding:40px 0}
.section-title h2{font-size:22px}
.article-header h1{font-size:22px}
.article-body{font-size:15px}
.article-body h2{font-size:20px}
.article-body h3{font-size:17px}
.nav-menu{display:none;position:fixed;top:64px;left:0;right:0;background:var(--white);flex-direction:column;padding:12px;box-shadow:var(--shadow-lg);max-height:calc(100vh - 64px);overflow-y:auto}
.nav-menu.active{display:flex}
.nav-menu>li{width:100%}
.nav-menu>li>a{line-height:44px;border-bottom:1px solid var(--border)}
.nav-dropdown{position:static;transform:none;opacity:1;visibility:visible;box-shadow:none;padding:0 0 0 20px;display:none}
.nav-menu>li:hover .nav-dropdown{display:block}
.nav-toggle{display:flex}
.related-grid{grid-template-columns:1fr}
.article-nav{grid-template-columns:1fr}
.sidebar{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr}
.article-meta{gap:12px}
.cmp-table{font-size:12px}
.cmp-table th,.cmp-table td{padding:8px 10px}
}
@media(max-width:480px){
.article-header h1{font-size:19px}
.article-body{font-size:14px}
.article-body h2{font-size:18px}
.article-body h3{font-size:16px}
.toc-box{padding:16px}
.article-meta{font-size:12px}
}