/* roulang page: index */
:root{
  --color-primary:#4A90D9;
  --color-primary-hover:#3B78B4;
  --color-primary-light:#E8F1FA;
  --color-text:#1E2A38;
  --color-text-secondary:#5A6B7B;
  --color-bg:#FFFFFF;
  --color-bg-alt:#F5F7FA;
  --color-border:#DEE4EA;
  --color-accent:#F0A622;
  --color-accent-hover:#D08E1B;
  --color-danger:#E74C3C;
  --color-success:#27AE60;
  --shadow-default:0 1px 4px rgba(30,42,56,.06);
  --shadow-hover:0 8px 24px rgba(30,42,56,.08);
  --radius-card:12px;
  --radius-btn:8px;
  --radius-search:40px;
  --radius-tag:20px;
  --container-width:1200px;
  --space-section:72px;
  --space-section-mobile:48px;
  --font-family:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font-family);font-size:15px;line-height:1.75;color:var(--color-text);background:var(--color-bg);letter-spacing:.02em}
img{max-width:100%;display:block;object-fit:cover}
a{color:inherit;text-decoration:none;transition:color .2s ease}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;font-size:inherit}
input{font-family:inherit;font-size:inherit;color:inherit}
ul,ol{list-style:none}
.container{max-width:var(--container-width);margin:0 auto;padding:0 24px}
.section{padding:var(--space-section) 0}
.section-heading{display:flex;align-items:center;gap:12px;margin-bottom:36px}
.heading-bar{display:inline-block;width:4px;height:22px;background:var(--color-primary);border-radius:2px}
.section-heading h2{font-size:24px;font-weight:600;letter-spacing:.01em;line-height:1.3}
.section-more{margin-left:auto;font-size:14px;color:var(--color-text-secondary);display:inline-flex;align-items:center;gap:6px;font-weight:500}
.section-more:hover{color:var(--color-primary)}
.section-more i{font-size:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 28px;border-radius:var(--radius-btn);font-size:15px;font-weight:500;transition:all .25s ease;white-space:nowrap}
.btn-primary{background:var(--color-primary);color:#fff;box-shadow:0 4px 12px rgba(74,144,217,.25)}
.btn-primary:hover{background:var(--color-primary-hover);transform:translateY(-2px);box-shadow:0 8px 20px rgba(74,144,217,.3)}
.btn-primary:active{transform:translateY(0)}
.btn-secondary{background:#fff;color:var(--color-primary);border:1px solid var(--color-primary)}
.btn-secondary:hover{background:var(--color-primary-light);border-color:var(--color-primary)}
.btn-secondary:active{transform:translateY(0)}
.btn-accent{background:var(--color-accent);color:#fff;box-shadow:0 4px 12px rgba(240,166,34,.3)}
.btn-accent:hover{background:var(--color-accent-hover);transform:translateY(-2px);box-shadow:0 8px 20px rgba(240,166,34,.35)}
.btn-accent:active{transform:translateY(0)}
.tag{display:inline-flex;align-items:center;padding:4px 14px;background:var(--color-primary-light);color:var(--color-primary);border-radius:var(--radius-tag);font-size:12px;font-weight:500;line-height:1.6}
.empty-state{padding:40px 20px;text-align:center;color:var(--color-text-secondary);background:var(--color-bg-alt);border-radius:var(--radius-card);font-size:14px}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid #F0F2F5;height:64px}
.header-inner{height:64px;display:flex;align-items:center;gap:20px}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-icon{width:36px;height:36px;border-radius:10px;background:var(--color-primary);display:flex;align-items:center;justify-content:center;color:#fff;font-size:17px;box-shadow:0 4px 10px rgba(74,144,217,.25)}
.logo-text{font-size:20px;font-weight:700;letter-spacing:.01em;white-space:nowrap}
.logo-text:hover{color:var(--color-primary)}
.search-box{position:relative;display:flex;align-items:center;max-width:420px;width:100%;flex:1;margin:0 auto;transition:all .25s ease}
.search-icon{position:absolute;left:16px;color:var(--color-text-secondary);font-size:14px;pointer-events:none;z-index:2}
.search-input{width:100%;height:44px;border-radius:var(--radius-search);border:1px solid transparent;background:var(--color-primary-light);padding:0 46px 0 42px;font-size:14px;outline:none;transition:all .25s ease;letter-spacing:.02em}
.search-input::placeholder{color:#8A96A3}
.search-input:focus{background:#fff;border-color:var(--color-primary);box-shadow:0 0 0 4px rgba(74,144,217,.15)}
.search-key{position:absolute;right:14px;color:#A9B4BE;font-size:13px;font-weight:500;background:rgba(255,255,255,.7);border:1px solid var(--color-border);border-radius:6px;padding:2px 8px;pointer-events:none;z-index:2}
.main-nav{display:flex;align-items:center;gap:6px;flex-shrink:0}
.desktop-links{display:flex;align-items:center;gap:2px}
.nav-link{display:inline-flex;align-items:center;height:64px;padding:0 14px;font-size:15px;font-weight:500;color:var(--color-text);position:relative;white-space:nowrap;transition:color .2s ease}
.nav-link:hover{color:var(--color-primary)}
.nav-link.active{color:var(--color-primary)}
.nav-link.active::after{content:"";position:absolute;left:14px;right:14px;bottom:0;height:3px;background:var(--color-primary);border-radius:3px 3px 0 0}
.category-dropdown{position:relative;display:none}
.dropdown-btn{display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 18px;border-radius:var(--radius-btn);font-size:14px;font-weight:500;color:var(--color-text);background:var(--color-bg-alt);border:1px solid var(--color-border);transition:all .2s ease}
.dropdown-btn:hover{color:var(--color-primary);border-color:var(--color-primary);background:var(--color-primary-light)}
.dropdown-panel{position:absolute;top:calc(100% + 8px);right:0;min-width:180px;background:#fff;border:1px solid var(--color-border);border-radius:var(--radius-card);box-shadow:var(--shadow-hover);padding:8px;opacity:0;visibility:hidden;transform:translateY(-6px);transition:all .25s ease;z-index:50}
.dropdown-panel.open{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown-panel a{display:block;padding:10px 14px;border-radius:8px;font-size:14px;color:var(--color-text);transition:all .15s ease}
.dropdown-panel a:hover{background:var(--color-primary-light);color:var(--color-primary)}
.nav-toggle{display:none;width:42px;height:42px;border-radius:10px;align-items:center;justify-content:center;font-size:18px;color:var(--color-text);background:var(--color-bg-alt);border:1px solid var(--color-border);flex-shrink:0;transition:all .2s ease}
.nav-toggle:hover{color:var(--color-primary);border-color:var(--color-primary)}
.mobile-drawer{position:fixed;top:64px;left:0;right:0;bottom:0;background:#fff;z-index:99;padding:24px 20px;display:flex;flex-direction:column;gap:24px;transform:translateX(-100%);transition:transform .35s cubic-bezier(.4,0,.2,1);overflow-y:auto}
.mobile-drawer.open{transform:translateX(0)}
.mobile-drawer .search-box{max-width:100%}
.mobile-nav-links{display:flex;flex-direction:column;gap:4px}
.mobile-nav-links .nav-link{display:block;height:auto;padding:14px 16px;border-radius:10px;font-size:16px;font-weight:500}
.mobile-nav-links .nav-link:hover{background:var(--color-primary-light)}
.mobile-nav-links .nav-link.active::after{display:none}
.mobile-nav-links .nav-link.active{background:var(--color-primary-light)}

/* Hero */
.hero{background:linear-gradient(135deg,#EBF3FB 0%,#FFFFFF 60%);padding:80px 0 72px;position:relative;overflow:hidden}
.hero-inner{display:flex;align-items:center;gap:60px}
.hero-content{max-width:520px;flex-shrink:0}
.hero h1{font-size:32px;font-weight:700;line-height:1.35;letter-spacing:.01em;margin-bottom:18px}
.hero h1 span{color:var(--color-primary)}
.hero-sub{font-size:16px;line-height:1.8;color:var(--color-text-secondary);margin-bottom:32px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-visual{flex:1;min-width:0}
.hero-img{width:100%;border-radius:16px;box-shadow:var(--shadow-hover);object-fit:cover;aspect-ratio:16/11}
.hero-stats{display:flex;gap:48px;margin-top:60px;padding-top:32px;border-top:1px solid rgba(74,144,217,.15)}
.hero-stat{display:flex;flex-direction:column;gap:4px}
.hero-stat strong{font-size:24px;font-weight:700;color:var(--color-primary);line-height:1.2}
.hero-stat span{font-size:13px;color:var(--color-text-secondary)}

/* Category cards */
.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.category-card{background:#fff;border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-default);border:1px solid #F0F2F5;transition:all .3s ease;display:flex;flex-direction:column}
.category-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.category-image{aspect-ratio:16/10;overflow:hidden;border-radius:0;margin:0}
.category-image img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.category-card:hover .category-image img{transform:scale(1.03)}
.category-body{padding:20px;display:flex;flex-direction:column;gap:8px;flex:1}
.category-body h3{font-size:17px;font-weight:600;color:var(--color-text)}
.category-body p{font-size:14px;color:var(--color-text-secondary);line-height:1.6}
.card-link{margin-top:auto;font-size:14px;font-weight:500;color:var(--color-primary);display:inline-flex;align-items:center;gap:6px;padding-top:8px}
.card-link i{font-size:12px;transition:transform .2s ease}
.category-card:hover .card-link i{transform:translateX(4px)}

/* Advantages */
.advantages{background:var(--color-bg-alt)}
.adv-feature{display:flex;align-items:center;gap:48px;background:#fff;border-radius:var(--radius-card);box-shadow:var(--shadow-default);overflow:hidden;margin-bottom:32px}
.adv-feature-text{padding:48px;flex:1}
.adv-feature-text h3{font-size:22px;font-weight:600;margin-bottom:16px;line-height:1.3}
.adv-feature-text p{font-size:15px;color:var(--color-text-secondary);line-height:1.8}
.adv-feature-img{width:44%;flex-shrink:0;min-height:260px;position:relative}
.adv-feature-img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.adv-cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.adv-mini-card{background:#fff;border-radius:var(--radius-card);padding:28px;box-shadow:var(--shadow-default);display:flex;flex-direction:column;gap:12px;transition:all .25s ease}
.adv-mini-card:hover{box-shadow:var(--shadow-hover)}
.adv-mini-card:nth-child(2){background:var(--color-primary-light)}
.adv-icon{width:48px;height:48px;border-radius:12px;background:var(--color-primary-light);color:var(--color-primary);display:flex;align-items:center;justify-content:center;font-size:20px}
.adv-mini-card:nth-child(2) .adv-icon{background:#fff}
.adv-mini-card h3{font-size:16px;font-weight:600}
.adv-mini-card p{font-size:14px;color:var(--color-text-secondary);line-height:1.7}

/* Featured */
.featured-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.featured-card{background:#fff;border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-default);border:1px solid #F0F2F5;transition:all .3s ease;display:flex;flex-direction:column}
.featured-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.featured-image{aspect-ratio:16/9;overflow:hidden}
.featured-image img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.featured-card:hover .featured-image img{transform:scale(1.03)}
.featured-body{padding:24px;display:flex;flex-direction:column;gap:10px;flex:1}
.featured-body .tag{align-self:flex-start}
.featured-body h3{font-size:18px;font-weight:600;line-height:1.4}
.featured-body h3 a:hover{color:var(--color-primary)}
.featured-body p{font-size:14px;color:var(--color-text-secondary);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.featured-meta{display:flex;align-items:center;gap:12px;margin-top:auto;padding-top:12px;border-top:1px solid #F0F2F5;font-size:13px;color:var(--color-text-secondary)}
.featured-meta i{font-size:12px;margin-right:4px}

/* Latest */
.latest-section{background:var(--color-bg-alt)}
.latest-layout{display:grid;grid-template-columns:1fr 320px;gap:40px}
.info-list{display:flex;flex-direction:column;gap:16px}
.info-card{background:#fff;border-radius:var(--radius-card);padding:24px;box-shadow:var(--shadow-default);border:1px solid #F0F2F5;transition:all .25s ease}
.info-card:hover{box-shadow:var(--shadow-hover);border-color:var(--color-primary-light)}
.info-card-top{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.info-date{font-size:13px;color:var(--color-text-secondary);margin-left:auto}
.info-title{font-size:17px;font-weight:600;margin-bottom:8px;line-height:1.4}
.info-title a:hover{color:var(--color-primary)}
.info-summary{font-size:14px;color:var(--color-text-secondary);line-height:1.7;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.read-more{font-size:14px;font-weight:500;color:var(--color-primary);display:inline-flex;align-items:center;gap:6px}
.read-more i{font-size:12px;transition:transform .2s ease}
.read-more:hover i{transform:translateX(4px)}
.side-widget{background:#fff;border-radius:var(--radius-card);padding:24px;box-shadow:var(--shadow-default);margin-bottom:24px}
.side-widget h3{font-size:17px;font-weight:600;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--color-primary-light)}
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-cloud .tag{transition:all .2s ease;cursor:pointer}
.tag-cloud .tag:hover{background:var(--color-primary);color:#fff}
.hot-list{display:flex;flex-direction:column}
.hot-list li{border-bottom:1px solid #F0F2F5}
.hot-list li:last-child{border-bottom:none}
.hot-list a{display:block;padding:12px 0;font-size:14px;color:var(--color-text);transition:color .2s ease}
.hot-list a:hover{color:var(--color-primary)}

/* Related */
.related-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.related-card{background:#fff;border-radius:var(--radius-card);padding:24px;box-shadow:var(--shadow-default);border:1px solid #F0F2F5;display:flex;flex-direction:column;gap:10px;transition:all .25s ease}
.related-card:hover{box-shadow:var(--shadow-hover);border-color:var(--color-primary-light);transform:translateY(-3px)}
.related-card h3{font-size:16px;font-weight:600;line-height:1.4}
.related-card h3:hover{color:var(--color-primary)}
.related-card p{font-size:13px;color:var(--color-text-secondary);line-height:1.6}

/* FAQ */
.faq-layout{display:grid;grid-template-columns:repeat(2,1fr);gap:32px;column-gap:64px}
.faq-item{border-bottom:1px solid var(--color-border)}
.faq-question{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 0;font-size:15px;font-weight:500;text-align:left;color:var(--color-text);transition:color .2s ease}
.faq-question:hover{color:var(--color-primary)}
.faq-icon{width:28px;height:28px;border-radius:50%;background:var(--color-primary-light);color:var(--color-primary);display:flex;align-items:center;justify-content:center;font-size:13px;flex-shrink:0;transition:all .3s ease}
.faq-item.active .faq-icon{background:var(--color-primary);color:#fff;transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease;line-height:1.7}
.faq-item.active .faq-answer{max-height:280px}
.faq-answer p{padding:0 0 20px;font-size:14px;color:var(--color-text-secondary)}

/* CTA */
.save-cta{padding:48px 0 80px}
.cta-box{background:linear-gradient(135deg,var(--color-primary-light),#F5F9FD);border-radius:16px;padding:48px;text-align:center;box-shadow:var(--shadow-default)}
.cta-box h2{font-size:26px;font-weight:600;margin-bottom:12px}
.cta-box p{font-size:15px;color:var(--color-text-secondary);margin-bottom:28px;max-width:520px;margin-left:auto;margin-right:auto}
.cta-actions{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap}
.share-label{font-size:14px;color:var(--color-text-secondary);margin-left:8px}
.share-btn{width:44px;height:44px;border-radius:12px;background:#fff;border:1px solid var(--color-border);display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--color-text);transition:all .2s ease}
.share-btn:hover{color:var(--color-primary);border-color:var(--color-primary);box-shadow:var(--shadow-default);transform:translateY(-2px)}

/* Footer */
.site-footer{background:#1E2A38;color:rgba(255,255,255,.8);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:40px;padding-bottom:48px}
.footer-brand .footer-logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:#fff;margin-bottom:14px}
.footer-brand .footer-logo .logo-icon{background:var(--color-primary)}
.footer-brand p{font-size:14px;line-height:1.7;max-width:260px}
.footer-col h4{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col ul{display:flex;flex-direction:column;gap:8px}
.footer-col li{line-height:1.4}
.footer-col a{font-size:14px;color:rgba(255,255,255,.7);transition:color .2s ease}
.footer-col a:hover{color:#fff;text-decoration:underline}
.footer-contact li{font-size:14px;display:flex;align-items:center;gap:10px;padding:6px 0}
.footer-contact i{width:18px;color:var(--color-primary);font-size:15px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;text-align:center;font-size:13px;color:rgba(255,255,255,.5)}
.footer-bottom a{color:rgba(255,255,255,.6)}
.footer-bottom a:hover{color:#fff}

/* Responsive */
@media (max-width:1023px){
  .desktop-links{display:none}
  .category-dropdown{display:block}
  .search-box{max-width:280px}
  .category-grid{grid-template-columns:repeat(2,1fr)}
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .hero-inner{gap:32px}
  .hero h1{font-size:28px}
  .adv-feature{gap:24px}
  .adv-feature-text{padding:32px}
  .adv-feature-img{width:38%}
}
@media (max-width:767px){
  :root{--space-section:48px}
  .section{padding:var(--space-section) 0}
  .container{padding:0 16px}
  .site-header{height:auto;padding:10px 0}
  .header-inner{height:auto;flex-wrap:wrap;gap:12px;padding:0 16px}
  .logo-text{font-size:18px}
  .nav-toggle{display:flex}
  .category-dropdown{display:none}
  .search-box{max-width:100%;order:3;flex-basis:100%}
  .hero{padding:48px 0 40px}
  .hero-inner{flex-direction:column;gap:28px}
  .hero-content{max-width:100%}
  .hero h1{font-size:26px}
  .hero-sub{font-size:15px}
  .hero-actions{gap:12px}
  .btn{height:44px;padding:0 20px}
  .hero-stats{gap:24px;margin-top:36px;flex-wrap:wrap}
  .hero-stat strong{font-size:20px}
  .category-grid{grid-template-columns:1fr;gap:16px}
  .category-image{aspect-ratio:16/9}
  .adv-feature{flex-direction:column}
  .adv-feature-img{width:100%;min-height:200px;order:-1}
  .adv-cards-grid{grid-template-columns:1fr;gap:16px}
  .featured-grid{grid-template-columns:1fr;gap:24px}
  .latest-layout{grid-template-columns:1fr;gap:32px}
  .related-grid{grid-template-columns:1fr;gap:16px}
  .faq-layout{grid-template-columns:1fr;gap:0}
  .cta-box{padding:32px 24px}
  .cta-box h2{font-size:22px}
  .cta-actions{gap:10px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px;padding-bottom:32px}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:479px){
  .footer-grid{grid-template-columns:1fr}
  .hero-visual{display:none}
}

/* roulang page: article */
:root {
  --primary: #4A90D9;
  --primary-hover: #3B78B4;
  --primary-soft: #E8F1FA;
  --text-main: #1E2A38;
  --text-secondary: #5A6B7B;
  --bg-main: #FFFFFF;
  --bg-section: #F5F7FA;
  --border: #DEE4EA;
  --accent: #F0A622;
  --accent-hover: #D08E1B;
  --shadow-sm: 0 1px 4px rgba(30,42,56,.06);
  --shadow-hover: 0 8px 24px rgba(30,42,56,.08);
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-input: 8px;
  --radius-search: 40px;
  --radius-tag: 20px;
  --container: 1200px;
  --spacer: 72px;
  --spacer-mobile: 48px;
  --font-stack: "PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font-stack);font-size:15px;line-height:1.75;color:var(--text-main);background:var(--bg-main);letter-spacing:.02em}
img{max-width:100%;display:block;border:0}
a{color:var(--primary);text-decoration:none;transition:color .25s ease,border-color .25s ease}
a:hover{color:var(--primary-hover)}
a:focus-visible{outline:3px solid rgba(74,144,217,.3);outline-offset:2px;border-radius:4px}
button{font-family:var(--font-stack);cursor:pointer;border:none;background:none}
input,select,textarea{font-family:var(--font-stack)}
ul,ol{list-style:none}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
@media(max-width:768px){.container{padding:0 16px}}

/* ===== Header & Navigation ===== */
.site-header{position:sticky;top:0;z-index:100;background:var(--bg-main);border-bottom:1px solid #F0F2F5;box-shadow:0 2px 12px rgba(30,42,56,.04)}
.header-inner{display:flex;align-items:center;gap:20px;height:64px;position:relative}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-icon{width:38px;height:38px;background:var(--primary);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;box-shadow:0 2px 8px rgba(74,144,217,.25);transition:transform .3s ease}
.logo:hover .logo-icon{transform:rotate(-8deg)}
.logo-text{font-size:20px;font-weight:700;color:var(--text-main);letter-spacing:.01em;white-space:nowrap}
.search-box{flex:1;max-width:420px;height:44px;background:var(--primary-soft);border-radius:var(--radius-search);display:flex;align-items:center;padding:0 18px;margin:0 auto;transition:background .3s ease,box-shadow .3s ease,border-color .3s ease;border:1px solid transparent}
.search-box:focus-within{background:var(--bg-main);border-color:var(--primary);box-shadow:0 0 0 4px rgba(74,144,217,.15)}
.search-icon{color:var(--text-secondary);font-size:14px;margin-right:10px;flex-shrink:0}
.search-input{flex:1;border:none;outline:none;background:transparent;font-size:14px;color:var(--text-main);line-height:44px;min-width:0}
.search-input::placeholder{color:#8B9BA9}
.search-key{color:var(--text-secondary);font-size:12px;background:rgba(0,0,0,.04);border-radius:6px;padding:2px 8px;border:1px solid var(--border);flex-shrink:0}
.main-nav{display:flex;align-items:center;gap:6px;flex-shrink:0}
.desktop-links{display:flex;align-items:center;gap:2px}
.nav-link{display:block;padding:8px 14px;font-size:15px;font-weight:500;color:var(--text-main);border-radius:6px;transition:background .25s ease,color .25s ease}
.nav-link:hover{background:var(--primary-soft);color:var(--primary)}
.nav-link.active{color:var(--primary);box-shadow:inset 0 -2px 0 var(--primary)}
.category-dropdown{position:relative;display:none}
.dropdown-btn{display:flex;align-items:center;gap:8px;padding:8px 16px;background:var(--primary-soft);color:var(--primary);border-radius:20px;font-size:14px;font-weight:500;transition:background .25s ease}
.dropdown-btn:hover{background:var(--primary);color:#fff}
.dropdown-panel{position:absolute;top:calc(100% + 10px);right:0;background:var(--bg-main);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow-hover);min-width:180px;padding:8px;display:none;z-index:50}
.dropdown-panel a{display:block;padding:10px 16px;font-size:14px;color:var(--text-main);border-radius:8px;transition:background .2s ease,color .2s ease}
.dropdown-panel a:hover{background:var(--primary-soft);color:var(--primary)}
.category-dropdown:hover .dropdown-panel,.category-dropdown:focus-within .dropdown-panel{display:block}
.nav-toggle{display:none;width:42px;height:42px;border-radius:8px;background:var(--primary-soft);color:var(--primary);font-size:18px;align-items:center;justify-content:center;transition:background .25s ease;flex-shrink:0}
.nav-toggle:hover{background:var(--primary);color:#fff}
.mobile-drawer{display:none;background:var(--bg-main);border-top:1px solid #F0F2F5;padding:16px 16px 24px}
.mobile-drawer .search-box{width:100%;max-width:100%;margin-bottom:16px}
.mobile-nav-links{display:flex;flex-direction:column;gap:2px}
.mobile-nav-links .nav-link{padding:14px 12px;font-size:16px}
.mobile-drawer.open{display:block;position:absolute;top:64px;left:0;right:0;box-shadow:0 12px 24px rgba(30,42,56,.08);max-height:calc(100vh - 64px);overflow-y:auto}
@media(max-width:1023px){
.desktop-links{display:none}
.category-dropdown{display:block}
.nav-toggle{display:flex}
.search-box{max-width:320px}
}
@media(max-width:767px){
.header-inner{flex-wrap:wrap;padding-top:10px;padding-bottom:10px;gap:10px;height:auto}
.logo{order:1}
.nav-toggle{order:3}
.search-box{order:4;width:100%;max-width:100%;margin:0}
.category-dropdown{order:2;display:none}
.main-nav{order:3}
.search-key{display:none}
}

/* ===== Breadcrumb ===== */
.breadcrumb{background:var(--bg-section);padding:14px 0;border-bottom:1px solid #F0F2F5;font-size:13px;color:var(--text-secondary)}
.breadcrumb a{color:var(--text-secondary);transition:color .25s ease}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{margin:0 8px;color:#B5C2CF}
.breadcrumb .current{color:var(--text-main);font-weight:500}

/* ===== Article Layout ===== */
.article-page{padding:48px 0 72px}
@media(max-width:768px){.article-page{padding:28px 0 48px}}
.article-wrap{max-width:760px;margin:0 auto}
.article-header{margin-bottom:36px}
.article-header .article-category{display:inline-flex;align-items:center;gap:6px;background:var(--primary-soft);color:var(--primary);font-size:13px;font-weight:500;padding:6px 16px;border-radius:20px;margin-bottom:18px}
.article-header h1{font-size:28px;font-weight:700;line-height:1.4;color:var(--text-main);letter-spacing:.01em;margin-bottom:16px}
@media(max-width:768px){.article-header h1{font-size:22px}}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px;color:var(--text-secondary);font-size:13px;padding-top:14px;border-top:1px solid #F0F2F5}
.article-meta .meta-item{display:inline-flex;align-items:center;gap:6px}
.article-meta .meta-item i{font-size:13px;color:var(--primary)}

/* ===== Article Body ===== */
.article-body{font-size:16px;line-height:1.8;color:var(--text-main);word-break:break-word}
.article-body p{margin-bottom:24px}
.article-body h2{font-size:22px;font-weight:600;line-height:1.5;margin:40px 0 16px;padding-left:14px;border-left:4px solid var(--primary);color:var(--text-main)}
.article-body h3{font-size:18px;font-weight:600;margin:32px 0 12px;color:var(--text-main)}
.article-body h4{font-size:16px;font-weight:600;margin:24px 0 10px;color:var(--text-main)}
.article-body ul,.article-body ol{margin-bottom:24px;padding-left:24px}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li{margin-bottom:8px;line-height:1.7}
.article-body img{border-radius:8px;object-fit:cover;margin:24px 0;box-shadow:var(--shadow-sm)}
.article-body blockquote{border-left:3px solid var(--primary);background:var(--bg-section);padding:16px 24px;margin:24px 0;border-radius:0 8px 8px 0;color:var(--text-secondary);font-size:15px;line-height:1.7}
.article-body a{color:var(--primary);border-bottom:1px solid rgba(74,144,217,.3)}
.article-body a:hover{border-bottom-color:var(--primary)}
.article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:14px}
.article-body table th{background:var(--primary-soft);color:var(--text-main);font-weight:600;padding:12px 16px;text-align:left;border:1px solid var(--border)}
.article-body table td{padding:12px 16px;border:1px solid var(--border);color:var(--text-secondary)}
.article-body table tr:nth-child(even){background:#FAFBFC}
.article-body code{background:var(--primary-soft);padding:2px 8px;border-radius:4px;font-size:14px;color:var(--primary);font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace}
.article-body pre{background:#1E2A38;color:#E8F1FA;padding:20px 24px;border-radius:8px;overflow-x:auto;margin:24px 0;font-size:14px;line-height:1.7}
.article-body pre code{background:none;padding:0;color:inherit;font-size:14px}
.article-body hr{border:none;border-top:1px solid var(--border);margin:40px 0}

/* ===== Article Footer / Tags ===== */
.article-footer{margin-top:40px;padding-top:28px;border-top:1px solid #F0F2F5}
.article-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}
.article-tags .tag{display:inline-flex;align-items:center;gap:6px;background:var(--primary-soft);color:var(--primary);font-size:12px;padding:6px 14px;border-radius:20px;transition:background .25s ease,color .25s ease}
.article-tags .tag:hover{background:var(--primary);color:#fff}
.share-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:16px 20px;background:var(--bg-section);border-radius:12px}
.share-row .share-label{font-size:14px;font-weight:500;color:var(--text-main);display:flex;align-items:center;gap:8px}
.share-row .share-label i{color:var(--primary)}
.share-btn{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;background:var(--bg-main);color:var(--text-secondary);font-size:16px;transition:all .25s ease;box-shadow:var(--shadow-sm)}
.share-btn:hover{background:var(--primary);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.share-btn.copy-btn{width:auto;padding:0 16px;border-radius:20px;font-size:13px;gap:6px;color:var(--primary);border:1px solid var(--primary)}
.share-btn.copy-btn:hover{background:var(--primary);color:#fff}

/* ===== Related Articles ===== */
.related-section{margin-top:56px}
.related-section .section-title{font-size:22px;font-weight:700;color:var(--text-main);margin-bottom:24px;display:flex;align-items:center;gap:10px}
.related-section .section-title::before{content:'';width:4px;height:20px;background:var(--primary);border-radius:2px}
.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media(max-width:768px){.related-grid{grid-template-columns:1fr}}
.related-card{background:var(--bg-main);border:1px solid #F0F2F5;border-radius:12px;padding:24px;box-shadow:var(--shadow-sm);transition:box-shadow .3s ease,transform .3s ease;display:flex;flex-direction:column;gap:12px}
.related-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.related-card .related-date{color:var(--text-secondary);font-size:13px;display:flex;align-items:center;gap:6px}
.related-card .related-date i{color:var(--primary)}
.related-card h3{font-size:16px;font-weight:600;color:var(--text-main);line-height:1.5}
.related-card h3 a{color:var(--text-main);transition:color .25s ease}
.related-card h3 a:hover{color:var(--primary)}
.related-card p{font-size:14px;color:var(--text-secondary);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related-card .read-more{font-size:13px;color:var(--primary);font-weight:500;display:inline-flex;align-items:center;gap:6px;margin-top:auto}
.related-card .read-more i{transition:transform .25s ease}
.related-card .read-more:hover i{transform:translateX(4px)}
.back-home{margin-top:36px;text-align:center}
.back-home a{display:inline-flex;align-items:center;gap:8px;color:var(--text-secondary);font-size:14px;transition:all .25s ease;padding:10px 20px;border-radius:8px}
.back-home a:hover{color:var(--primary);background:var(--primary-soft)}

/* ===== Not Found ===== */
.not-found{max-width:760px;margin:0 auto;text-align:center;padding:80px 24px}
.not-found .nf-icon{font-size:56px;color:var(--border);margin-bottom:24px}
.not-found h1{font-size:24px;font-weight:700;color:var(--text-main);margin-bottom:16px}
.not-found p{color:var(--text-secondary);font-size:15px;margin-bottom:32px}
.not-found .btn{display:inline-flex;align-items:center;gap:8px;padding:12px 32px;background:var(--primary);color:#fff;border-radius:8px;font-size:15px;font-weight:500;transition:all .3s ease}
.not-found .btn:hover{background:var(--primary-hover);transform:translateY(-2px);box-shadow:var(--shadow-hover)}

/* ===== Footer ===== */
.site-footer{background:#1E2A38;color:rgba(255,255,255,.8);margin-top:0;padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px}
@media(max-width:1023px){.footer-grid{grid-template-columns:1fr 1fr;gap:32px}}
@media(max-width:640px){.footer-grid{grid-template-columns:1fr;gap:28px}}
.footer-brand .footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:16px;color:#fff}
.footer-brand .footer-logo .logo-icon{background:var(--primary);color:#fff;width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:17px}
.footer-brand .footer-logo span:last-child{font-size:20px;font-weight:700}
.footer-brand p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.65);max-width:260px}
.footer-col h4{font-size:16px;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{color:rgba(255,255,255,.7);font-size:14px;transition:all .25s ease}
.footer-col ul a:hover{color:#fff;text-decoration:underline}
.footer-contact li{font-size:14px;color:rgba(255,255,255,.7);display:flex;align-items:center;gap:10px;margin-bottom:12px}
.footer-contact i{color:var(--primary);width:16px;flex-shrink:0}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:13px;color:rgba(255,255,255,.5)}
.footer-bottom p{margin:0}

/* ===== Responsive ===== */
@media(max-width:1023px){
.search-box{max-width:300px}
}
@media(max-width:767px){
body{font-size:15px;line-height:1.75}
.site-header{position:relative}
.article-page{padding:24px 0 48px}
.article-header h1{font-size:22px}
.article-body{font-size:15px}
.article-body p{margin-bottom:20px}
.article-body h2{font-size:20px;margin:32px 0 14px}
.share-row{gap:8px;padding:14px 16px}
.related-grid{gap:16px}
.footer-bottom{padding:16px 0}
}

/* roulang page: category1 */
:root {
  --primary: #4A90D9;
  --primary-hover: #3B78B4;
  --primary-light: #E8F1FA;
  --text-main: #1E2A38;
  --text-secondary: #5A6B7B;
  --bg-main: #FFFFFF;
  --bg-section: #F5F7FA;
  --border: #DEE4EA;
  --accent: #F0A622;
  --accent-hover: #D08E1B;
  --shadow: 0 1px 4px rgba(30,42,56,0.06);
  --shadow-hover: 0 8px 24px rgba(30,42,56,0.08);
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-input: 8px;
  --radius-search: 40px;
  --radius-tag: 20px;
  --max-width: 1200px;
  --space-section: 72px;
  --font: "PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font); font-size: 15px; line-height: 1.8; letter-spacing: 0.02em; color: var(--text-main); background: var(--bg-main); }
a { color: var(--primary); text-decoration: none; transition: color 0.25s ease; }
a:hover, a:focus { color: var(--primary-hover); text-decoration: underline; }
img { max-width: 100%; display: block; object-fit: cover; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }
input { font-family: var(--font); }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5 { line-height: 1.4; color: var(--text-main); }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.section { padding: var(--space-section) 0; }
.section-alt { background: var(--bg-section); }
.section-header { display: flex; align-items: center; gap: 12px; margin-bottom: 40px; }
.section-header::before { content: ""; display: block; width: 4px; height: 26px; background: var(--primary); border-radius: 4px; flex-shrink: 0; }
.section-header h2 { font-size: 24px; font-weight: 600; letter-spacing: 0.01em; }
.section-header p { color: var(--text-secondary); font-size: 14px; margin-left: 8px; }
.link-more { font-size: 14px; font-weight: 500; color: var(--primary); white-space: nowrap; }
.link-more i { font-size: 12px; margin-left: 4px; transition: margin-left 0.25s ease; }
.link-more:hover { text-decoration: none; color: var(--primary-hover); }
.link-more:hover i { margin-left: 8px; }

.site-header { position: sticky; top: 0; z-index: 1000; background: #fff; border-bottom: 1px solid #F0F2F5; box-shadow: 0 1px 8px rgba(30,42,56,0.04); }
.header-inner { display: flex; align-items: center; gap: 16px; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; text-decoration: none; }
.logo:hover { text-decoration: none; }
.logo-icon { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; background: var(--primary-light); color: var(--primary); border-radius: 10px; font-size: 18px; }
.logo-text { font-size: 20px; font-weight: 700; letter-spacing: 0.01em; color: var(--text-main); }
.search-box { flex: 0 1 420px; display: flex; align-items: center; gap: 8px; height: 44px; padding: 0 14px; background: var(--primary-light); border: 1px solid transparent; border-radius: 22px; transition: all 0.25s ease; margin: 0 auto; }
.search-box:focus-within { background: #fff; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(74,144,217,0.15); }
.search-icon { color: var(--text-secondary); font-size: 14px; flex-shrink: 0; }
.search-input { flex: 1; border: none; outline: none; background: transparent; font-size: 14px; color: var(--text-main); }
.search-input::placeholder { color: var(--text-secondary); opacity: 0.8; }
.search-key { width: 22px; height: 22px; border-radius: 6px; border: 1px solid var(--border); text-align: center; line-height: 20px; font-size: 12px; color: var(--text-secondary); flex-shrink: 0; }
.main-nav { display: flex; align-items: center; flex-shrink: 0; }
.desktop-links { display: flex; align-items: center; gap: 4px; }
.nav-link { display: inline-block; padding: 8px 14px; font-size: 15px; font-weight: 500; color: var(--text-main); border-radius: 8px; transition: all 0.25s ease; position: relative; }
.nav-link:hover { background: var(--primary-light); color: var(--primary); text-decoration: none; }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px; height: 2px; background: var(--primary); border-radius: 2px; }
.category-dropdown { position: relative; display: none; }
.dropdown-btn { display: flex; align-items: center; gap: 6px; padding: 8px 14px; font-size: 15px; font-weight: 500; color: var(--text-main); border-radius: 8px; transition: all 0.25s ease; }
.dropdown-btn:hover { background: var(--primary-light); color: var(--primary); }
.dropdown-panel { position: absolute; top: calc(100% + 8px); right: 0; min-width: 180px; background: #fff; border-radius: 12px; box-shadow: var(--shadow-hover); border: 1px solid var(--border); padding: 8px; opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all 0.3s ease; z-index: 100; }
.category-dropdown:hover .dropdown-panel, .category-dropdown:focus-within .dropdown-panel { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-panel a { display: block; padding: 10px 14px; color: var(--text-main); font-size: 14px; border-radius: 8px; }
.dropdown-panel a:hover { background: var(--primary-light); color: var(--primary); text-decoration: none; }
.nav-toggle { display: none; width: 42px; height: 42px; border-radius: 10px; align-items: center; justify-content: center; font-size: 20px; color: var(--text-main); transition: background 0.25s ease; }
.nav-toggle:hover { background: var(--bg-section); }
.mobile-drawer { position: fixed; top: 64px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); box-shadow: 0 12px 32px rgba(30,42,56,0.1); padding: 20px; transform: translateY(-100%); opacity: 0; visibility: hidden; transition: all 0.3s ease; z-index: 999; }
.mobile-drawer.open { transform: translateY(0); opacity: 1; visibility: visible; }
.mobile-drawer .search-box { width: 100%; margin-bottom: 16px; max-width: none; }
.mobile-nav-links { display: flex; flex-direction: column; gap: 2px; }
.mobile-nav-links .nav-link { padding: 12px 16px; border-radius: 8px; }
.mobile-nav-links .nav-link.active { background: var(--primary-light); }

.pb-hero { position: relative; background: linear-gradient(135deg, #EBF3FB 0%, #FFFFFF 100%); padding: 72px 0 64px; overflow: hidden; }
.pb-hero-inner { position: relative; z-index: 2; }
.breadcrumb { font-size: 13px; color: var(--text-secondary); margin-bottom: 20px; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { margin: 0 8px; color: var(--border); }
.pb-hero-tag { display: inline-flex; align-items: center; gap: 6px; background: var(--primary-light); color: var(--primary); font-size: 13px; font-weight: 500; padding: 4px 14px; border-radius: var(--radius-tag); margin-bottom: 16px; }
.pb-hero h1 { font-size: 32px; font-weight: 700; letter-spacing: 0.01em; line-height: 1.3; margin-bottom: 14px; }
.pb-hero-desc { max-width: 780px; font-size: 16px; line-height: 1.8; color: var(--text-secondary); margin-bottom: 28px; }
.pb-hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.btn-primary { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding: 0 28px; background: var(--primary); color: #fff; border-radius: var(--radius-btn); font-size: 15px; font-weight: 500; text-decoration: none; border: 1px solid var(--primary); transition: all 0.3s ease; }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(74,144,217,0.25); text-decoration: none; }
.btn-primary:active { transform: translateY(0); }
.btn-outline { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding: 0 28px; background: #fff; color: var(--primary); border: 1px solid var(--primary); border-radius: var(--radius-btn); font-size: 15px; font-weight: 500; text-decoration: none; transition: all 0.3s ease; }
.btn-outline:hover { background: var(--primary-light); color: var(--primary-hover); text-decoration: none; transform: translateY(-2px); }
.btn-outline:active { transform: translateY(0); }
.btn-accent { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding: 0 28px; background: var(--accent); color: #fff; border-radius: var(--radius-btn); font-size: 15px; font-weight: 500; text-decoration: none; transition: all 0.3s ease; box-shadow: 0 4px 14px rgba(240,166,34,0.25); }
.btn-accent:hover { background: var(--accent-hover); color: #fff; transform: translateY(-2px); text-decoration: none; box-shadow: 0 8px 22px rgba(240,166,34,0.35); }
.pb-hero-stats { display: flex; flex-wrap: wrap; gap: 36px; margin-top: 44px; padding-top: 28px; border-top: 1px solid rgba(222,228,234,0.6); }
.pb-stat { display: flex; flex-direction: column; gap: 2px; }
.pb-stat-num { font-size: 26px; font-weight: 700; color: var(--primary); line-height: 1.2; }
.pb-stat-label { font-size: 13px; color: var(--text-secondary); }
.pb-hero-thumb { position: absolute; right: 0; bottom: 0; width: 46%; height: 100%; background: url('/assets/images/backpic/back-2.png') no-repeat center / cover; border-top-left-radius: 24px; opacity: 0.35; }

.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card { background: #fff; border-radius: var(--radius-card); overflow: hidden; box-shadow: var(--shadow); border: 1px solid rgba(222,228,234,0.5); transition: all 0.3s ease; display: flex; flex-direction: column; }
.product-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.product-card-img { height: 180px; overflow: hidden; position: relative; }
.product-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.35s ease; }
.product-card:hover .product-card-img img { transform: scale(1.04); }
.pc-tag { position: absolute; top: 12px; left: 12px; background: rgba(255,255,255,0.92); color: var(--primary); font-size: 12px; font-weight: 500; padding: 3px 12px; border-radius: var(--radius-tag); box-shadow: 0 2px 8px rgba(30,42,56,0.08); }
.product-card-body { padding: 20px 22px 22px; display: flex; flex-direction: column; flex: 1; }
.product-card-body h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.product-card-body p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; flex: 1; margin-bottom: 14px; }
.pc-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.pc-meta span { font-size: 12px; background: var(--bg-section); color: var(--text-secondary); padding: 3px 10px; border-radius: var(--radius-tag); }
.pc-link { font-size: 14px; font-weight: 500; color: var(--primary); display: inline-flex; align-items: center; gap: 6px; }
.pc-link:hover { text-decoration: none; color: var(--primary-hover); }
.pc-link i { font-size: 12px; transition: margin-left 0.25s ease; }
.pc-link:hover i { margin-left: 6px; }

.process-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.process-step { position: relative; background: #fff; border-radius: var(--radius-card); padding: 32px 24px 24px; box-shadow: var(--shadow); border-top: 3px solid var(--primary); transition: all 0.3s ease; }
.process-step:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.process-step-num { width: 40px; height: 40px; border-radius: 50%; background: var(--primary-light); color: var(--primary); font-weight: 700; font-size: 16px; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.process-step h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.process-step p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

.scenario-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.scenario-card { background: #fff; border-radius: var(--radius-card); padding: 28px 24px; box-shadow: var(--shadow); border: 1px solid rgba(222,228,234,0.6); text-align: center; transition: all 0.3s ease; }
.scenario-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); border-color: var(--primary); }
.scenario-icon { width: 56px; height: 56px; margin: 0 auto 16px; background: var(--primary-light); color: var(--primary); border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 24px; }
.scenario-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.scenario-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

.metrics-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-bottom: 48px; }
.metric-box { background: #fff; border-radius: var(--radius-card); padding: 32px 24px; text-align: center; box-shadow: var(--shadow); border-bottom: 3px solid var(--primary); }
.metric-box .num { font-size: 30px; font-weight: 700; color: var(--primary); line-height: 1.2; }
.metric-box .label { font-size: 14px; color: var(--text-secondary); margin-top: 6px; }
.metric-box .num-accent { color: var(--accent); }

.faq-wrap { max-width: 860px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:first-child { border-top: 1px solid var(--border); }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 8px; font-size: 15px; font-weight: 500; color: var(--text-main); text-align: left; transition: color 0.25s ease; }
.faq-q:hover { color: var(--primary); }
.faq-q .faq-icon { width: 24px; height: 24px; border-radius: 50%; background: var(--primary-light); color: var(--primary); font-size: 13px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; transition: transform 0.3s ease; }
.faq-item.active .faq-q .faq-icon { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-a-inner { padding: 0 8px 22px; font-size: 14px; color: var(--text-secondary); line-height: 1.8; }

.cta-panel { background: var(--primary-light); border-radius: 16px; padding: 48px 40px; display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-text h2 { font-size: 24px; font-weight: 600; margin-bottom: 8px; }
.cta-text p { font-size: 15px; color: var(--text-secondary); max-width: 520px; }
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.related-cats { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.related-cats a { display: inline-flex; align-items: center; gap: 8px; background: #fff; border: 1px solid var(--border); color: var(--text-main); font-size: 14px; padding: 10px 20px; border-radius: var(--radius-btn); transition: all 0.25s ease; }
.related-cats a:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); text-decoration: none; }
.related-cats a i { color: var(--primary); font-size: 12px; }

.site-footer { background: #1E2A38; color: rgba(255,255,255,0.8); padding: 64px 0 0; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 0.8fr 1fr 1fr; gap: 48px; padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,0.12); }
.footer-brand .footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand .footer-logo .logo-icon { background: rgba(255,255,255,0.12); color: #fff; }
.footer-brand .footer-logo span:last-child { font-size: 20px; font-weight: 700; color: #fff; }
.footer-brand p { font-size: 14px; line-height: 1.8; max-width: 320px; }
.footer-col h4 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: rgba(255,255,255,0.7); font-size: 14px; transition: all 0.25s ease; text-decoration: none; }
.footer-col ul li a:hover { color: #fff; text-decoration: underline; }
.footer-contact li { font-size: 14px; display: flex; align-items: center; gap: 10px; }
.footer-contact i { color: var(--primary-light); width: 18px; }
.footer-bottom { padding: 24px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,0.5); border-top: 1px solid rgba(255,255,255,0.08); }

@media (max-width: 1023px) {
  .desktop-links { display: none; }
  .category-dropdown { display: block; }
  .header-inner { gap: 12px; }
  .search-box { flex-basis: 280px; }
  .pb-hero-thumb { width: 38%; opacity: 0.2; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .metrics-row { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 767px) {
  :root { --space-section: 48px; }
  .container { padding: 0 16px; }
  .header-inner { height: 56px; }
  .nav-toggle { display: flex; }
  .category-dropdown { display: none; }
  .search-box.search-box-header { display: none; }
  .mobile-drawer .search-box { display: flex; }
  .logo-text { font-size: 17px; }
  .logo-icon { width: 32px; height: 32px; font-size: 16px; }
  .pb-hero { padding: 48px 0 40px; }
  .pb-hero h1 { font-size: 26px; }
  .pb-hero-desc { font-size: 15px; }
  .pb-hero-thumb { display: none; }
  .pb-hero-stats { gap: 20px; margin-top: 32px; }
  .pb-stat-num { font-size: 22px; }
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 20px; }
  .section-header p { display: none; }
  .product-grid { grid-template-columns: 1fr; gap: 16px; }
  .product-card-img { height: 200px; }
  .process-steps { grid-template-columns: 1fr; gap: 16px; }
  .scenario-grid { grid-template-columns: 1fr; gap: 16px; }
  .metrics-row { grid-template-columns: 1fr 1fr; gap: 16px; }
  .metric-box { padding: 24px 16px; }
  .metric-box .num { font-size: 24px; }
  .cta-panel { padding: 32px 24px; flex-direction: column; align-items: flex-start; }
  .cta-actions { width: 100%; }
  .cta-actions .btn-primary, .cta-actions .btn-accent { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; padding-bottom: 32px; }
  .footer-brand p { max-width: 100%; }
}

/* roulang page: category3 */
:root{
  --primary:#4A90D9;
  --primary-hover:#3B78B4;
  --primary-light:#E8F1FA;
  --text-main:#1E2A38;
  --text-secondary:#5A6B7B;
  --bg-white:#FFFFFF;
  --bg-section:#F5F7FA;
  --border:#DEE4EA;
  --accent:#F0A622;
  --accent-hover:#D08E1B;
  --shadow:0 1px 4px rgba(30,42,56,0.06);
  --shadow-hover:0 8px 24px rgba(30,42,56,0.08);
  --radius-card:12px;
  --radius-btn:8px;
  --radius-input:8px;
  --radius-search:40px;
  --radius-tag:20px;
  --container:1200px;
  --section-space:72px;
  --transition:all .25s ease;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
  font-size:15px;line-height:1.8;color:var(--text-main);background:var(--bg-white);
  letter-spacing:0.02em;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--primary-hover)}
a:focus-visible,input:focus-visible,button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.site-header{
  position:sticky;top:0;z-index:1000;background:var(--bg-white);
  border-bottom:1px solid #F0F2F5;box-shadow:0 1px 8px rgba(30,42,56,0.04);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;height:64px;gap:24px;
}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-icon{
  width:36px;height:36px;background:var(--primary);border-radius:10px;
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;
  box-shadow:0 2px 8px rgba(74,144,217,0.3);
}
.logo-text{font-size:20px;font-weight:700;color:var(--text-main);letter-spacing:0.02em}
.search-box{
  flex:0 1 420px;display:flex;align-items:center;gap:0;height:44px;
  background:var(--primary-light);border-radius:var(--radius-search);
  padding:0 14px;transition:var(--transition);border:1px solid transparent;
}
.search-box:focus-within{
  background:#fff;border-color:var(--primary);box-shadow:0 0 0 4px rgba(74,144,217,0.15);
}
.search-icon{color:var(--text-secondary);font-size:14px;margin-right:10px}
.search-input{
  flex:1;border:none;background:transparent;font-size:14px;color:var(--text-main);
  outline:none;height:100%;
}
.search-input::placeholder{color:#8a9aa8}
.search-key{
  width:24px;height:24px;border-radius:6px;background:rgba(74,144,217,0.12);
  color:var(--primary);font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center;
}
.main-nav{display:flex;align-items:center;gap:8px;flex-shrink:0}
.desktop-links{display:flex;align-items:center;gap:6px}
.nav-link{
  display:inline-block;padding:8px 16px;font-size:15px;font-weight:500;color:var(--text-main);
  border-radius:var(--radius-btn);transition:var(--transition);
}
.nav-link:hover{color:var(--primary);background:var(--primary-light)}
.nav-link.active{color:var(--primary);font-weight:600;background:var(--primary-light)}
.category-dropdown{position:relative;display:none}
.dropdown-btn{
  display:flex;align-items:center;gap:8px;background:var(--bg-section);
  border:1px solid var(--border);border-radius:var(--radius-btn);
  padding:9px 16px;font-size:14px;font-weight:500;color:var(--text-main);cursor:pointer;transition:var(--transition);
}
.dropdown-btn:hover{border-color:var(--primary);color:var(--primary)}
.dropdown-panel{
  position:absolute;top:calc(100% + 8px);right:0;background:#fff;border:1px solid var(--border);
  border-radius:var(--radius-card);box-shadow:var(--shadow-hover);padding:8px;min-width:160px;
  display:none;z-index:200;
}
.dropdown-panel.show{display:block}
.dropdown-panel a{
  display:block;padding:10px 16px;font-size:14px;color:var(--text-main);border-radius:8px;
}
.dropdown-panel a:hover{background:var(--primary-light);color:var(--primary)}
.nav-toggle{
  display:none;background:none;border:1px solid var(--border);border-radius:var(--radius-btn);
  width:40px;height:40px;font-size:18px;color:var(--text-main);cursor:pointer;align-items:center;justify-content:center;
}
.mobile-drawer{
  display:none;background:#fff;border-top:1px solid #F0F2F5;padding:16px 24px;
  position:fixed;top:64px;left:0;right:0;z-index:999;box-shadow:0 12px 24px rgba(30,42,56,0.08);
}
.mobile-drawer.open{display:block}
.mobile-drawer .search-box{margin-bottom:16px;max-width:100%}
.mobile-nav-links{display:flex;flex-direction:column;gap:4px}
.mobile-nav-links .nav-link{padding:12px 12px;border-radius:8px;font-size:15px}
.mobile-nav-links .nav-link:hover{background:var(--primary-light);color:var(--primary)}

/* ===== Page Banner ===== */
.page-banner{
  background:linear-gradient(180deg,#EBF3FB 0%,#FFFFFF 100%);
  padding:56px 0 40px;border-bottom:1px solid #F0F2F5;
  position:relative;overflow:hidden;
}
.page-banner .container{position:relative;z-index:2}
.banner-badge{
  display:inline-flex;align-items:center;gap:6px;background:rgba(74,144,217,0.1);
  color:var(--primary);font-size:13px;font-weight:500;padding:4px 16px;border-radius:var(--radius-tag);
  margin-bottom:16px;
}
.page-banner h1{
  font-size:28px;font-weight:700;color:var(--text-main);letter-spacing:0.01em;line-height:1.4;
  margin-bottom:14px;
}
.banner-desc{
  font-size:16px;line-height:1.8;color:var(--text-secondary);max-width:760px;
}

/* ===== Advantage Tech Grid ===== */
.tech-section{padding:var(--section-space) 0}
.tech-section:nth-child(even){background:var(--bg-section)}
.section-head{
  display:flex;align-items:flex-start;gap:12px;margin-bottom:40px;
}
.section-head::before{
  content:"";width:4px;height:32px;background:var(--primary);border-radius:4px;
  flex-shrink:0;margin-top:6px;
}
.section-head h2{font-size:24px;font-weight:600;color:var(--text-main);line-height:1.5}
.section-head p{font-size:15px;color:var(--text-secondary);margin-top:6px;max-width:640px}
.tech-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
.tech-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);
  padding:24px;box-shadow:var(--shadow);transition:var(--transition);display:flex;flex-direction:column;
}
.tech-card:hover{
  box-shadow:var(--shadow-hover);border-color:#c9d6e3;transform:translateY(-3px);
}
.tech-card-icon{
  width:48px;height:48px;border-radius:12px;background:var(--primary-light);
  color:var(--primary);font-size:20px;display:flex;align-items:center;justify-content:center;margin-bottom:18px;
}
.tech-card h3{font-size:17px;font-weight:600;color:var(--text-main);margin-bottom:8px;line-height:1.5}
.tech-card p{font-size:14px;color:var(--text-secondary);line-height:1.75;flex:1}
.tech-card .card-link{
  display:inline-flex;align-items:center;gap:6px;margin-top:16px;font-size:14px;font-weight:500;
  color:var(--primary);
}
.tech-card .card-link i{font-size:12px;transition:transform .3s ease}
.tech-card:hover .card-link i{transform:translateX(4px)}
.tech-card:hover .card-link{color:var(--primary-hover)}

/* ===== Stats ===== */
.stats-band{
  padding:48px 0;background:var(--primary-light);border-radius:var(--radius-card);
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin:48px 0 0;
  text-align:center;
}
.stat-item .stat-num{font-size:28px;font-weight:700;color:var(--primary);line-height:1.3}
.stat-item .stat-label{font-size:14px;color:var(--text-secondary);margin-top:6px}

/* ===== Process ===== */
.process-section{padding:var(--section-space) 0;background:var(--bg-section)}
.process-wrap{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:16px;
}
.process-step{
  text-align:center;padding:32px 20px;background:#fff;border-radius:var(--radius-card);
  box-shadow:var(--shadow);border:1px solid var(--border);transition:var(--transition);position:relative;
}
.process-step:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.step-num{
  width:40px;height:40px;border-radius:50%;background:var(--primary);color:#fff;
  font-size:16px;font-weight:600;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;
  box-shadow:0 4px 12px rgba(74,144,217,0.3);
}
.process-step h3{font-size:16px;font-weight:600;margin-bottom:8px;color:var(--text-main)}
.process-step p{font-size:14px;color:var(--text-secondary);line-height:1.7}

/* ===== Reliability Cards ===== */
.reliability-grid{
  display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:24px;margin-top:8px;
}
.reli-main{
  grid-row:span 2;background:linear-gradient(150deg,var(--primary-light) 0%,#f0f6fd 100%);
  border-radius:var(--radius-card);padding:32px;border:1px solid #d6e4f2;
  box-shadow:var(--shadow);
}
.reli-main .badge-light{
  display:inline-block;background:rgba(74,144,217,0.12);color:var(--primary);
  font-size:13px;padding:4px 14px;border-radius:var(--radius-tag);font-weight:500;margin-bottom:16px;
}
.reli-main h3{font-size:20px;font-weight:600;color:var(--text-main);margin-bottom:12px;line-height:1.5}
.reli-main p{font-size:15px;color:var(--text-secondary);line-height:1.8}
.reli-card{
  background:#fff;border-radius:var(--radius-card);padding:24px;box-shadow:var(--shadow);
  border:1px solid var(--border);transition:var(--transition);display:flex;gap:16px;align-items:flex-start;
}
.reli-card:hover{box-shadow:var(--shadow-hover);border-color:#c9d6e3}
.reli-icon{
  width:44px;height:44px;flex-shrink:0;border-radius:10px;background:var(--primary-light);
  color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:17px;
}
.reli-card h4{font-size:16px;font-weight:600;margin-bottom:6px;color:var(--text-main)}
.reli-card p{font-size:14px;color:var(--text-secondary);line-height:1.7}

/* ===== Quality & Test List ===== */
.quality-wrap{
  display:grid;grid-template-columns:1.2fr 1fr;gap:32px;align-items:start;
}
.quality-text h3{font-size:20px;font-weight:600;margin-bottom:16px;color:var(--text-main);line-height:1.5}
.quality-text p{font-size:15px;color:var(--text-secondary);line-height:1.8;margin-bottom:16px}
.test-list{list-style:none;margin-top:8px}
.test-list li{
  display:flex;align-items:flex-start;gap:12px;padding:12px 0;
  border-bottom:1px solid var(--border);font-size:15px;color:var(--text-main);
}
.test-list li:last-child{border-bottom:none}
.test-list li i{color:var(--primary);margin-top:4px;font-size:14px}
.test-list li strong{font-weight:600;color:var(--text-main)}
.test-list li span{color:var(--text-secondary);font-size:14px;display:block}
.quality-image{
  border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-hover);
}
.quality-image img{width:100%;height:100%;object-fit:cover;min-height:320px;border-radius:var(--radius-card);}

/* ===== Related Categories ===== */
.related-cats{
  padding:48px 0;background:#fff;
}
.related-inner{
  display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:center;
}
.related-label{font-size:15px;font-weight:600;color:var(--text-main);margin-right:8px}
.related-link{
  display:inline-block;padding:8px 20px;background:var(--primary-light);color:var(--primary);
  border-radius:var(--radius-tag);font-size:14px;font-weight:500;transition:var(--transition);
}
.related-link:hover{background:var(--primary);color:#fff;transform:translateY(-2px);box-shadow:0 4px 12px rgba(74,144,217,0.3)}

/* ===== CTA ===== */
.cta-section{padding:0 0 var(--section-space);background:var(--bg-section)}
.cta-box{
  background:var(--primary-light);border-radius:var(--radius-card);padding:48px;
  text-align:center;box-shadow:var(--shadow);
  background-image:url(/assets/images/backpic/back-1.webp);
  background-size:cover;background-position:center;position:relative;
}
.cta-box::before{
  content:"";position:absolute;inset:0;background:rgba(232,241,250,0.92);
  border-radius:var(--radius-card);
}
.cta-box>*{position:relative;z-index:1}
.cta-box h2{font-size:26px;font-weight:700;color:var(--text-main);margin-bottom:12px}
.cta-box p{font-size:15px;color:var(--text-secondary);max-width:520px;margin:0 auto 28px}
.cta-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 28px;border-radius:var(--radius-btn);font-size:15px;
  font-weight:500;cursor:pointer;border:1px solid transparent;transition:var(--transition);
  text-decoration:none;
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover);color:#fff;transform:translateY(-2px);box-shadow:0 8px 20px rgba(74,144,217,0.35)}
.btn-outline{background:#fff;border-color:var(--primary);color:var(--primary)}
.btn-outline:hover{background:var(--primary-light);color:var(--primary-hover);transform:translateY(-2px)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-hover);color:#fff;transform:translateY(-2px);box-shadow:0 8px 20px rgba(240,166,34,0.3)}

/* ===== FAQ ===== */
.faq-section{padding:var(--section-space) 0;background:#fff}
.faq-list{max-width:860px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border);transition:background .3s ease}
.faq-item:first-child{border-top:1px solid var(--border)}
.faq-question{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:22px 8px;cursor:pointer;background:transparent;border:none;
  width:100%;text-align:left;font-size:16px;font-weight:500;color:var(--text-main);
  transition:var(--transition);font-family:inherit;
}
.faq-question:hover{color:var(--primary)}
.faq-question .faq-icon{
  width:28px;height:28px;border-radius:50%;background:var(--primary-light);color:var(--primary);
  display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0;
  transition:transform .3s ease;
}
.faq-item.active .faq-icon{transform:rotate(45deg)}
.faq-answer{
  max-height:0;overflow:hidden;transition:max-height .35s ease;
  
}
.faq-item.active .faq-answer{max-height:300px}
.faq-answer-inner{padding:0 8px 20px;font-size:14px;color:var(--text-secondary);line-height:1.7}

/* ===== Site Footer ===== */
.site-footer{background:#1E2A38;color:rgba(255,255,255,0.8);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px}
.footer-brand .footer-logo{
  display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;
  color:#fff;margin-bottom:16px;
}
.footer-brand p{font-size:14px;line-height:1.75;opacity:0.8;max-width:280px}
.footer-col h4{
  font-size:15px;font-weight:600;color:#fff;margin-bottom:18px;
  letter-spacing:0.03em;
}
.footer-col ul{list-style:none}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a{color:rgba(255,255,255,0.7);font-size:14px;transition:var(--transition)}
.footer-col ul li a:hover{color:#fff;text-decoration:underline}
.footer-contact li{
  display:flex;align-items:flex-start;gap:10px;font-size:14px;
  color:rgba(255,255,255,0.7);line-height:1.6;
}
.footer-contact li i{color:var(--primary);margin-top:4px;font-size:13px}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.1);margin-top:48px;padding:20px 0;
  font-size:13px;text-align:center;color:rgba(255,255,255,0.5);
}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .desktop-links{display:none}
  .category-dropdown{display:block}
  .search-box{flex:0 1 320px}
  .tech-grid{grid-template-columns:repeat(2,1fr)}
  .process-wrap{grid-template-columns:repeat(2,1fr)}
  .reliability-grid{grid-template-columns:1fr 1fr}
  .reli-main{grid-row:span 1}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats-band{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:767px){
  .container{padding:0 16px}
  .header-inner{height:60px;gap:8px}
  .search-box{display:none}
  .nav-toggle{display:flex}
  .category-dropdown{display:none}
  .mobile-drawer{display:none;top:60px}
  .mobile-drawer.open{display:block}
  .mobile-drawer .search-box{display:flex}
  .page-banner{padding:40px 0 32px}
  .page-banner h1{font-size:24px}
  .banner-desc{font-size:15px}
  .section-space{padding:48px 0}
  .tech-section{padding:48px 0}
  .process-section{padding:48px 0}
  .faq-section{padding:48px 0}
  .tech-grid{grid-template-columns:1fr}
  .process-wrap{grid-template-columns:1fr;gap:16px}
  .reliability-grid{grid-template-columns:1fr}
  .reli-main{padding:24px}
  .quality-wrap{grid-template-columns:1fr}
  .quality-image img{min-height:200px}
  .stats-band{grid-template-columns:1fr;gap:24px;padding:32px 24px}
  .cta-section{padding-bottom:48px}
  .cta-box{padding:32px 20px}
  .cta-box h2{font-size:22px}
  .btn{width:100%;max-width:280px;margin:0 auto}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{margin-top:32px}
  .section-head h2{font-size:20px}
}

/* roulang page: category2 */
:root {
  --primary: #4A90D9;
  --primary-hover: #3B78B4;
  --primary-light: #E8F1FA;
  --text-main: #1E2A38;
  --text-sub: #5A6B7B;
  --bg-main: #FFFFFF;
  --bg-section: #F5F7FA;
  --border: #DEE4EA;
  --accent: #F0A622;
  --shadow: 0 1px 4px rgba(30,42,56,0.06);
  --shadow-hover: 0 8px 24px rgba(30,42,56,0.08);
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-search: 40px;
  --radius-tag: 20px;
  --container: 1200px;
  --space: 72px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  font-size: 15px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--text-main);
  background: var(--bg-main);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color .2s;
}

a:hover {
  color: var(--primary-hover);
}

img {
  max-width: 100%;
  display: block;
}

ul, ol {
  list-style: none;
}

button, input {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #FFFFFF;
  border-bottom: 1px solid #F0F2F5;
  box-shadow: 0 1px 4px rgba(30,42,56,0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  color: var(--text-main);
}

.logo:hover {
  color: var(--text-main);
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  box-shadow: 0 2px 8px rgba(74,144,217,0.3);
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.search-box {
  flex: 1;
  max-width: 420px;
  height: 44px;
  background: var(--primary-light);
  border-radius: var(--radius-search);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 10px;
  border: 1px solid transparent;
  transition: background .2s, border-color .2s, box-shadow .2s;
  margin: 0 auto;
}

.search-box:focus-within {
  background: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(74,144,217,0.15);
}

.search-icon {
  color: var(--text-sub);
  font-size: 14px;
}

.search-input {
  flex: 1;
  height: 100%;
  background: transparent;
  color: var(--text-main);
  font-size: 14px;
}

.search-input::placeholder {
  color: var(--text-sub);
  opacity: .8;
}

.search-key {
  width: 24px;
  height: 24px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--text-sub);
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.desktop-links {
  display: flex;
  gap: 6px;
}

.nav-link {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  line-height: 1.4;
  transition: background .2s, color .2s, box-shadow .2s;
}

.nav-link:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-link.active {
  color: var(--primary);
  background: var(--primary-light);
  box-shadow: inset 0 -2px 0 var(--primary);
}

.category-dropdown {
  display: none;
  position: relative;
}

.dropdown-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 16px;
  border-radius: var(--radius-btn);
  background: var(--bg-section);
  color: var(--text-main);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background .2s, color .2s;
}

.dropdown-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.dropdown-panel {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 160px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-hover);
  padding: 8px;
  z-index: 20;
}

.category-dropdown:hover .dropdown-panel,
.category-dropdown:focus-within .dropdown-panel {
  display: block;
}

.dropdown-panel a {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-main);
  transition: background .2s, color .2s;
}

.dropdown-panel a:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--bg-section);
  color: var(--text-main);
  font-size: 18px;
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.mobile-drawer {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: #fff;
  padding: 16px 24px 24px;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-hover);
  z-index: 99;
}

.mobile-drawer.open {
  display: block;
}

.mobile-drawer .search-box {
  display: flex;
  width: 100%;
  max-width: 100%;
  margin: 0 0 12px;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mobile-nav-links .nav-link {
  padding: 12px 8px;
  border-radius: 8px;
  font-size: 16px;
}

.mobile-nav-links .nav-link.active {
  box-shadow: inset 3px 0 0 var(--primary);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 28px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  line-height: 1;
  white-space: nowrap;
  transition: background .2s, box-shadow .2s, transform .2s, color .2s, border-color .2s;
}

.btn i {
  font-size: 14px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(74,144,217,0.25);
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(59,120,180,0.3);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: #fff;
  border: 1px solid var(--primary);
  color: var(--primary);
}

.btn-secondary:hover {
  background: var(--primary-light);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(240,166,34,0.25);
}

.btn-accent:hover {
  background: #D08E1B;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(208,142,27,0.3);
}

.btn-lg {
  height: 52px;
  padding: 0 32px;
  font-size: 16px;
}

/* ===== Page Hero ===== */
.page-hero {
  position: relative;
  padding: 72px 0 64px;
  background: linear-gradient(110deg, rgba(235,243,251,0.96) 0%, rgba(255,255,255,0.92) 60%, rgba(235,243,251,0.7) 100%), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--text-sub);
}

.breadcrumb a:hover {
  color: var(--primary);
}

.breadcrumb i {
  font-size: 12px;
  opacity: .6;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.01em;
  margin-bottom: 14px;
}

.page-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-sub);
  max-width: 780px;
  margin-bottom: 28px;
}

.page-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ===== Section ===== */
.section {
  padding: var(--space) 0;
}

.section.alt {
  background: var(--bg-section);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.section-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 12px;
  letter-spacing: 0.01em;
}

.section-title::before {
  content: '';
  width: 4px;
  height: 22px;
  border-radius: 2px;
  background: var(--primary);
  flex-shrink: 0;
}

.section-desc {
  color: var(--text-sub);
  font-size: 14px;
  max-width: 520px;
  text-align: right;
}

/* ===== Featured Cards ===== */
.featured-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  grid-auto-rows: auto;
  gap: 24px;
}

.card {
  background: #fff;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 24px;
  transition: box-shadow .25s, transform .25s;
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

.card-featured {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}

.card-featured .card-image-wrap {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-card) var(--radius-card) 0 0;
}

.card-featured .card-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}

.card-featured:hover .card-image-wrap img {
  transform: scale(1.03);
}

.card-featured.featured-main {
  grid-row: span 2;
  min-height: 420px;
}

.card-featured.featured-main .card-image-wrap {
  flex: 1 1 auto;
  min-height: 280px;
}

.card-featured.featured-main .card-image-wrap img {
  height: 100%;
  min-height: 280px;
}

.card-featured-sm .card-image-wrap {
  height: 120px;
  flex-shrink: 0;
}

.card-featured-sm .card-image-wrap img {
  height: 120px;
}

.card-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 2;
}

.card-body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-body h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.5;
}

.card-body p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
  flex: 1;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.card-link {
  margin-left: auto;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap .2s;
}

.card-link:hover {
  gap: 10px;
  color: var(--primary-hover);
}

/* ===== Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 14px;
  border-radius: var(--radius-tag);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
  white-space: nowrap;
}

.badge-accent {
  background: rgba(240,166,34,0.15);
  color: #C77A00;
}

/* ===== Scenario Cards ===== */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scenario-card {
  background: #fff;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 28px 24px;
  border: 1px solid transparent;
  transition: box-shadow .25s, border-color .25s, transform .25s;
}

.scenario-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

.scenario-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
  transition: background .25s, color .25s;
}

.scenario-card:hover .scenario-icon {
  background: var(--primary);
  color: #fff;
}

.scenario-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.scenario-card p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== Process ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-card {
  background: #fff;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  transition: box-shadow .25s, transform .25s;
}

.step-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.step-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.step-card p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ===== Stats ===== */
.stats-section {
  background: var(--bg-section);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-item {
  background: #fff;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 36px 20px;
  text-align: center;
  transition: box-shadow .25s, transform .25s;
}

.stat-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.stat-number {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--primary);
  letter-spacing: 0.01em;
}

.stat-item:nth-child(2) .stat-number,
.stat-item:nth-child(3) .stat-number {
  color: var(--accent);
}

.stat-label {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-sub);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  transition: background .25s;
}

.faq-item:first-child {
  border-top: 1px solid var(--border);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 8px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-main);
  transition: color .2s;
  user-select: none;
}

.faq-question:hover {
  color: var(--primary);
}

.faq-question .faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  transition: transform .3s, background .3s, color .3s;
}

.faq-item.active .faq-question .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: #fff;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
}

.faq-answer p {
  padding: 0 8px 20px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
}

.faq-item.active {
  background: var(--bg-section);
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

/* ===== CTA ===== */
.cta-section {
  padding: 48px 0 72px;
}

.cta-block {
  background: var(--primary-light);
  border-radius: 16px;
  padding: 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-block::before {
  content: '';
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: rgba(74,144,217,0.08);
  top: -60px;
  right: -40px;
}

.cta-block h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 12px;
}

.cta-block p {
  font-size: 15px;
  color: var(--text-sub);
  max-width: 560px;
  margin: 0 auto 28px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* ===== Related Categories ===== */
.related-cats {
  padding: 24px 0 72px;
  text-align: center;
}

.related-cats h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 20px;
}

.related-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 22px;
  border-radius: 20px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 14px;
  font-weight: 500;
  transition: background .2s, color .2s, box-shadow .2s;
}

.related-links a:hover {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(74,144,217,0.3);
}

/* ===== Footer ===== */
.site-footer {
  background: #1E2A38;
  color: rgba(255,255,255,0.8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding: 64px 0 40px;
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  max-width: 320px;
  color: rgba(255,255,255,0.65);
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul a {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  transition: color .2s, text-decoration .2s;
}

.footer-col ul a:hover {
  color: #fff;
  text-decoration: underline;
}

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(255,255,255,0.7);
}

.footer-contact i {
  width: 18px;
  text-align: center;
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.55);
}

.footer-bottom p {
  margin: 0;
}

/* ===== Responsive ===== */
@media (max-width: 1023px) {
  .desktop-links {
    display: none;
  }

  .category-dropdown {
    display: block;
  }

  .search-box {
    max-width: 280px;
  }

  .featured-grid {
    grid-template-columns: 1fr 1fr;
  }

  .card-featured.featured-main {
    grid-column: span 2;
    grid-row: auto;
  }

  .scenario-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 767px) {
  .header-inner .search-box {
    display: none;
  }

  .category-dropdown {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .mobile-drawer {
    display: none;
  }

  .mobile-drawer.open {
    display: block;
  }

  .container {
    padding: 0 16px;
  }

  .header-inner {
    gap: 12px;
  }

  .section {
    padding: 48px 0;
  }

  .page-hero {
    padding: 48px 0 40px;
  }

  .page-title {
    font-size: 24px;
  }

  .page-lead {
    font-size: 15px;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .section-desc {
    text-align: left;
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .card-featured.featured-main {
    grid-column: span 1;
  }

  .scenario-grid {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .cta-section {
    padding: 32px 0 48px;
  }

  .cta-block {
    padding: 32px 20px;
  }

  .cta-actions {
    flex-direction: column;
  }

  .cta-actions .btn {
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 48px 0 32px;
  }

  .related-cats {
    padding-bottom: 48px;
  }

  .related-links a {
    width: 100%;
    justify-content: center;
  }

  .btn {
    height: 44px;
    padding: 0 20px;
  }
}

/* roulang page: category4 */
:root {
  --primary: #4A90D9;
  --primary-hover: #3B78B4;
  --primary-light: #E8F1FA;
  --text-main: #1E2A38;
  --text-secondary: #5A6B7B;
  --bg-white: #FFFFFF;
  --bg-section: #F5F7FA;
  --border-color: #DEE4EA;
  --accent: #F0A622;
  --accent-hover: #D08E1B;
  --shadow-default: 0 1px 4px rgba(30,42,56,0.06);
  --shadow-hover: 0 8px 24px rgba(30,42,56,0.08);
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-input: 8px;
  --radius-search: 40px;
  --radius-tag: 20px;
  --container-max: 1200px;
  --spacing-section: 72px;
  --spacing-card: 24px;
  --font-stack: "PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-stack);
  font-size: 15px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--text-main);
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; object-fit: cover; }

a { color: var(--primary); text-decoration: none; transition: color 0.25s ease; }
a:hover { color: var(--primary-hover); }

ul { list-style: none; }

button { font-family: inherit; cursor: pointer; border: none; background: none; }

input[type="search"], input[type="text"], input[type="email"] {
  font-family: inherit;
  height: 44px;
  border-radius: var(--radius-input);
  border: 1px solid var(--border-color);
  padding: 0 16px;
  font-size: 14px;
  background: var(--bg-white);
  outline: none;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

input[type="search"]:focus, input[type="text"]:focus, input[type="email"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(74,144,217,0.15);
}

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-white);
  border-bottom: 1px solid #F0F2F5;
  height: 64px;
  box-shadow: 0 1px 8px rgba(30,42,56,0.04);
}

.header-inner {
  height: 64px;
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: 1400px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.search-box {
  flex: 1;
  max-width: 420px;
  height: 44px;
  display: flex;
  align-items: center;
  background: var(--primary-light);
  border-radius: var(--radius-search);
  padding: 0 18px;
  gap: 10px;
  margin: 0 auto;
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  border: 1px solid transparent;
}

.search-box:focus-within {
  background: var(--bg-white);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(74,144,217,0.15);
}

.search-icon { font-size: 14px; color: var(--text-secondary); }

.search-input {
  flex: 1;
  height: 40px;
  border: none;
  background: transparent;
  font-size: 14px;
  color: var(--text-main);
  padding: 0;
}

.search-input:focus { outline: none; box-shadow: none; border: none; }
.search-input::placeholder { color: #8A9AA8; }

.search-key {
  font-size: 13px;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.7);
  border-radius: 6px;
  padding: 2px 8px;
  border: 1px solid var(--border-color);
  line-height: 1.4;
}

.main-nav { display: flex; align-items: center; flex-shrink: 0; }

.desktop-links { display: flex; gap: 4px; }

.nav-link {
  display: inline-block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  border-radius: 8px;
  position: relative;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link:hover { color: var(--primary); background: var(--primary-light); }

.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 2px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

.category-dropdown { display: none; position: relative; }

.dropdown-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--text-main);
  transition: color 0.2s ease, background 0.2s ease;
}

.dropdown-btn:hover { color: var(--primary); background: var(--primary-light); }

.dropdown-panel {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  background: var(--bg-white);
  border-radius: var(--radius-card);
  box-shadow: 0 8px 24px rgba(30,42,56,0.1);
  border: 1px solid var(--border-color);
  padding: 8px;
  width: 180px;
  z-index: 100;
}

.dropdown-panel a {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-main);
}

.dropdown-panel a:hover { background: var(--primary-light); color: var(--primary); }

.category-dropdown:hover .dropdown-panel { display: block; }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.nav-toggle:hover { background: var(--primary-light); color: var(--primary); }

.mobile-drawer {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 8px 24px rgba(30,42,56,0.08);
  padding: 20px 24px 24px;
  z-index: 999;
}

.mobile-drawer.open { display: block; }

.mobile-drawer .search-box { width: 100%; max-width: none; margin-bottom: 16px; }

.mobile-nav-links { display: flex; flex-direction: column; gap: 4px; }

.mobile-nav-links .nav-link { display: block; padding: 12px 16px; border-radius: 8px; }
.mobile-nav-links .nav-link:hover { background: var(--primary-light); }

.mobile-nav-links .nav-link.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }

/* ============ Page Hero / Title Section ============ */
.page-hero {
  background: linear-gradient(135deg, #EBF3FB 0%, #FFFFFF 60%, #F0F4F8 100%);
  padding: 80px 0 64px;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 320px;
  height: 320px;
  background: rgba(74,144,217,0.06);
  border-radius: 50%;
}

.page-hero .container {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 48px;
}

.page-hero-text { max-width: 560px; }

.page-hero h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-bottom: 16px;
  color: var(--text-main);
  position: relative;
  padding-left: 20px;
}

.page-hero h1::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 28px;
  border-radius: 2px;
  background: var(--primary);
}

.page-hero-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.page-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 14px;
  border-radius: var(--radius-tag);
  font-weight: 500;
}

.hero-tag i { font-size: 12px; }

.page-hero-image {
  flex-shrink: 0;
  width: 420px;
  height: 260px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(30,42,56,0.12);
  background: var(--primary-light);
}

.page-hero-image img { width: 100%; height: 100%; }

/* ============ Breadcrumb ============ */
.breadcrumb {
  padding: 20px 0 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.breadcrumb .container { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }

.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }

.breadcrumb .sep { color: #B0BCC8; }

.breadcrumb .current { color: var(--primary); font-weight: 500; }

/* ============ Section Base ============ */
.section { padding: var(--spacing-section) 0; }

.section-alt { background: var(--bg-section); }

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
}

.section-title-wrap { display: flex; align-items: flex-start; gap: 16px; }

.section-bar {
  width: 4px;
  height: 28px;
  background: var(--primary);
  border-radius: 2px;
  flex-shrink: 0;
  margin-top: 6px;
}

.section-title {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-main);
  margin-bottom: 6px;
}

.section-sub {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ============ Cards Grid ============ */
.content-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-card);
}

.info-card {
  background: var(--bg-white);
  border-radius: var(--radius-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-default);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.info-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

.info-card-image {
  position: relative;
  width: 100%;
  height: 180px;
  overflow: hidden;
  background: var(--primary-light);
}

.info-card-image img {
  width: 100%;
  height: 100%;
  transition: transform 0.3s ease;
}

.info-card:hover .info-card-image img { transform: scale(1.03); }

.info-card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(74,144,217,0.92);
  color: #fff;
  font-size: 12px;
  font-weight: 500;
  padding: 3px 12px;
  border-radius: var(--radius-tag);
  backdrop-filter: blur(4px);
}

.info-card-body { padding: 20px; display: flex; flex-direction: column; flex: 1; }

.info-card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.5;
  transition: color 0.2s ease;
}

.info-card:hover .info-card-title { color: var(--primary); }

.info-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
  flex: 1;
}

.info-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
  padding-top: 12px;
  border-top: 1px solid #F0F2F5;
}

.info-card-meta .meta-left { display: flex; align-items: center; gap: 8px; }
.info-card-meta i { font-size: 12px; }

.info-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
  white-space: nowrap;
  transition: gap 0.2s ease;
}

.info-card-link:hover { gap: 10px; color: var(--primary-hover); }

/* ============ Feature Split ============ */
.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.feature-image {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-hover);
}

.feature-image img { width: 100%; height: 320px; }

.feature-content h3 { font-size: 22px; font-weight: 600; margin-bottom: 16px; color: var(--text-main); }

.feature-content p { color: var(--text-secondary); margin-bottom: 16px; font-size: 15px; }

.feature-list { margin: 20px 0; }

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  font-size: 15px;
  color: var(--text-main);
}

.feature-list li i {
  color: var(--primary);
  font-size: 14px;
  margin-top: 5px;
  width: 20px;
  height: 20px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ============ Data Highlights ============ */
.data-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  background: var(--bg-white);
  border-radius: var(--radius-card);
  border: 1px solid var(--border-color);
  padding: 32px 40px;
  box-shadow: var(--shadow-default);
}

.data-item { text-align: center; }

.data-number {
  font-size: 32px;
  font-weight: 700;
  font-family: var(--font-stack);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.data-label { font-size: 14px; color: var(--text-secondary); }

/* ============ Topic Links ============ */
.related-topic {
  background: var(--bg-white);
  border-radius: var(--radius-card);
  border: 1px solid var(--border-color);
  padding: 32px;
  box-shadow: var(--shadow-default);
}

.related-topic h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.related-topic h3 i { color: var(--primary); font-size: 18px; }

.topic-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.topic-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--radius-tag);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.topic-link:hover { background: var(--primary); color: #fff; transform: translateY(-1px); }

.topic-link i { font-size: 12px; }

/* ============ CTA ============ */
.cta-section { padding: 72px 0; }

.cta-box {
  background: var(--primary-light);
  border-radius: 16px;
  padding: 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 160px;
  height: 160px;
  background: rgba(74,144,217,0.1);
  border-radius: 50%;
}

.cta-box h2 { font-size: 24px; font-weight: 600; color: var(--text-main); margin-bottom: 12px; }

.cta-box p { color: var(--text-secondary); margin-bottom: 28px; max-width: 560px; margin-left: auto; margin-right: auto; }

.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 28px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.25s ease;
  cursor: pointer;
  border: none;
  line-height: 1;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(74,144,217,0.3); color: #fff; }

.btn-secondary { background: var(--bg-white); color: var(--primary); border: 1px solid var(--primary); }
.btn-secondary:hover { background: var(--primary-light); transform: translateY(-1px); }

.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(240,166,34,0.3); color: #fff; }

/* ============ FAQ ============ */
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 48px; }

.faq-item { border-bottom: 1px solid var(--border-color); padding: 20px 0; }

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  user-select: none;
  transition: color 0.25s ease;
}

.faq-question:hover { color: var(--primary); }

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  color: var(--primary);
  transition: transform 0.3s ease, background 0.3s ease, color 0.3s ease;
}

.faq-item.active .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease, opacity 0.3s ease;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  opacity: 0;
  padding: 0;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-top: 12px;
  opacity: 1;
}

/* ============ Footer ============ */
.site-footer {
  background: var(--text-main);
  color: rgba(255,255,255,0.8);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  max-width: 260px;
}

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-col ul li { margin-bottom: 12px; }

.footer-col ul li a {
  color: rgba(255,255,255,0.8);
  font-size: 14px;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-col ul li a:hover {
  color: #fff;
  padding-left: 4px;
  text-decoration: underline;
}

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: rgba(255,255,255,0.8);
}

.footer-contact li i { color: var(--primary); width: 16px; }

.footer-bottom {
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  gap: 16px;
  flex-wrap: wrap;
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .header-inner { gap: 16px; }
  .search-box { max-width: 280px; }
  .desktop-links { display: none; }
  .category-dropdown { display: block; }

  .content-grid { grid-template-columns: repeat(2, 1fr); }

  .data-strip { grid-template-columns: repeat(2, 1fr); grid-template-rows: auto auto; gap: 24px; }

  .page-hero-image { width: 320px; height: 220px; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  :root { --spacing-section: 48px; }

  .container { padding: 0 16px; }

  .nav-toggle { display: flex; }
  .main-nav .category-dropdown { display: none; }
  .search-box { display: none; }
  .header-inner { gap: 12px; }

  .logo-text { font-size: 18px; }

  .page-hero { padding: 48px 0 40px; }
  .page-hero .container { flex-direction: column-reverse; gap: 32px; }
  .page-hero-text { max-width: 100%; }
  .page-hero h1 { font-size: 24px; padding-left: 16px; }
  .page-hero-desc { font-size: 15px; }
  .page-hero-image { width: 100%; height: 200px; }
  .hero-tag { font-size: 12px; padding: 3px 10px; }

  .section-head { flex-direction: column; gap: 12px; margin-bottom: 28px; }
  .section-title { font-size: 20px; }
  .section-bar { height: 22px; }

  .content-grid { grid-template-columns: 1fr; }

  .feature-split { grid-template-columns: 1fr; gap: 24px; }
  .feature-image img { height: 220px; }

  .data-strip { grid-template-columns: 1fr 1fr; padding: 24px; }
  .data-number { font-size: 24px; }

  .faq-grid { grid-template-columns: 1fr; gap: 0; }

  .cta-box { padding: 32px 20px; }
  .cta-box h2 { font-size: 20px; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-brand p { max-width: 100%; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .desktop-links { display: none; }
  .header-inner .search-box { display: none; }
}

@media (max-width: 520px) {
  .logo-text { display: none; }
  .logo-icon { width: 32px; height: 32px; }
  .data-strip { grid-template-columns: 1fr; }
  .content-grid .info-card-image { height: 160px; }
  .related-topic { padding: 24px; }
}