/* roulang page: index */
:root {
  --c-bg: #0B1324;
  --c-bg-deep: #060D1E;
  --c-bg-soft: #081126;
  --c-blue-mid: #10306E;
  --c-blue-hi: #1A4C9B;
  --c-cyan: #2DE2E6;
  --c-amber: #FFB454;
  --c-text: #EAF2FF;
  --c-text-2: #9FB6D9;
  --c-text-3: #6680A8;
  --glass-bg: rgba(255,255,255,0.06);
  --glass-border: rgba(255,255,255,0.12);
  --radius-card: 16px;
  --radius-btn: 12px;
  --radius-input: 12px;
  --radius-pill: 999px;
  --shadow-low: 0 4px 20px rgba(0,0,0,0.25);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.4);
  --spacing-section: clamp(64px, 8vw, 110px);
  --container-w: 1200px;
  --font-main: "PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",sans-serif;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-main);
  background:var(--c-bg);
  color:var(--c-text);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select,textarea{font-family:inherit;font-size:inherit;color:inherit;outline:none}
ul,ol{list-style:none}
.container{max-width:var(--container-w);margin:0 auto;padding:0 20px}
section{position:relative}
.section{padding:var(--spacing-section) 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:40px;gap:20px}
.section-head h2{font-size:clamp(1.7rem,3.5vw,2.4rem);font-weight:700;line-height:1.3;letter-spacing:-0.01em}
.section-link{color:var(--c-text-2);font-size:14px;font-weight:500;display:inline-flex;align-items:center;gap:6px;transition:color .25s ease-out;white-space:nowrap}
.section-link:hover{color:var(--c-cyan)}
.section-link .arrow{transition:transform .25s ease-out}
.section-link:hover .arrow{transform:translateX(4px)}
.badge-pill{display:inline-block;padding:4px 14px;border-radius:var(--radius-pill);background:rgba(45,226,230,0.15);color:var(--c-cyan);font-size:12px;font-weight:500;letter-spacing:0.02em}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 28px;border-radius:var(--radius-btn);font-size:15px;font-weight:600;
  transition:all .25s ease-out;border:1px solid transparent;white-space:nowrap;
}
.btn-primary{background:var(--c-cyan);color:#0A1F44;box-shadow:0 0 0 rgba(45,226,230,0)}
.btn-primary:hover{box-shadow:0 0 24px rgba(45,226,230,0.45);transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,0.05);border-color:rgba(255,255,255,0.2);color:var(--c-text)}
.btn-ghost:hover{border-color:var(--c-cyan);color:var(--c-cyan)}
.btn:focus-visible,button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid rgba(45,226,230,0.6);outline-offset:2px;box-shadow:0 0 0 2px rgba(255,255,255,0.15)}
/* ===== Header / Nav ===== */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(6,13,30,0.78);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid rgba(255,255,255,0.06);
  height:72px;transition:height .3s ease,background .3s ease;
}
.site-header.scrolled{height:60px;background:rgba(6,13,30,0.92)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:20px}
.logo{display:flex;align-items:center;gap:10px;color:var(--c-text);font-weight:700;font-size:20px;letter-spacing:0.02em;white-space:nowrap}
.logo-icon{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--c-cyan),var(--c-blue-hi));display:flex;align-items:center;justify-content:center;color:#0A1F44;font-weight:900;font-size:15px;flex-shrink:0}
.main-nav{display:flex;align-items:center;gap:4px}
.nav-link{
  padding:8px 16px;border-radius:10px;color:var(--c-text-2);font-size:15px;font-weight:500;
  position:relative;transition:color .25s ease,background .25s ease;
}
.nav-link:hover{color:#fff;background:rgba(255,255,255,0.05)}
.nav-link.active{color:#fff;}
.nav-link.active::after{
  content:'';position:absolute;left:16px;right:16px;bottom:0;height:3px;
  background:linear-gradient(90deg,var(--c-cyan),rgba(45,226,230,0.1));
  border-radius:3px;
}
.header-actions{display:flex;align-items:center;gap:10px}
.search-box{
  position:relative;width:220px;transition:width .3s ease;
}
.search-box input{
  width:100%;height:38px;padding:0 38px 0 38px;border-radius:var(--radius-pill);
  background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.1);
  font-size:13px;color:var(--c-text);transition:all .3s ease;
}
.search-box input::placeholder{color:var(--c-text-3)}
.search-box input:focus{width:280px;border-color:rgba(45,226,230,0.5);box-shadow:0 0 0 3px rgba(45,226,230,0.15)}
.search-box .icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--c-text-3);font-size:14px;pointer-events:none}
.search-suggest{
  position:absolute;top:46px;left:0;right:0;background:rgba(6,13,30,0.95);
  border:1px solid rgba(255,255,255,0.1);border-radius:12px;padding:8px 0;
  display:none;box-shadow:var(--shadow-hover);backdrop-filter:blur(18px);z-index:100;
}
.search-box input:focus ~ .search-suggest,.search-suggest:hover{display:block}
.search-suggest a{display:block;padding:8px 16px;font-size:13px;color:var(--c-text-2);transition:background .2s,color .2s}
.search-suggest a:hover{background:rgba(45,226,230,0.08);color:var(--c-cyan)}
.header-cta{height:38px;padding:0 22px;font-size:14px;border-radius:var(--radius-pill);background:var(--c-cyan);color:#0A1F44;font-weight:600;display:inline-flex;align-items:center;gap:6px;transition:box-shadow .25s,transform .25s}
.header-cta:hover{box-shadow:0 0 20px rgba(45,226,230,0.4);transform:translateY(-2px)}
.nav-toggle{display:none;width:40px;height:40px;border-radius:10px;background:rgba(255,255,255,0.06);align-items:center;justify-content:center;font-size:18px}
/* ===== Hero ===== */
.hero{
  position:relative;padding:80px 0 90px;overflow:hidden;
  background:radial-gradient(ellipse at 80% 20%,#102A5C 0%,var(--c-bg) 60%);
}
.hero::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,0.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,0.04) 1px,transparent 1px);
  background-size:40px 40px;
}
.hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;position:relative;z-index:2}
.hero-content .hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(16,48,110,0.6);border:1px solid rgba(45,226,230,0.2);padding:7px 16px;border-radius:var(--radius-pill);font-size:13px;color:var(--c-text);margin-bottom:24px}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:var(--c-cyan);box-shadow:0 0 8px rgba(45,226,230,0.6)}
.hero h1{font-size:clamp(2.2rem,5.2vw,3.4rem);font-weight:800;line-height:1.2;letter-spacing:-0.01em;margin-bottom:22px}
.hero h1 .grad{
  background:linear-gradient(120deg,var(--c-cyan),#7AB8FF);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{font-size:clamp(1rem,1.4vw,1.15rem);color:var(--c-text-2);line-height:1.7;margin-bottom:32px;max-width:520px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:42px}
.hero-stats{display:flex;gap:32px;flex-wrap:wrap}
.stat-item .stat-num{font-size:clamp(1.4rem,2.5vw,1.8rem);font-weight:700;color:var(--c-cyan)}
.stat-item .stat-label{font-size:13px;color:var(--c-text-3);margin-top:2px}
.hero-visual{position:relative;min-height:420px}
.hero-visual .back-img{
  width:100%;height:420px;object-fit:cover;border-radius:var(--radius-card);
  border:1px solid rgba(255,255,255,0.12);box-shadow:var(--shadow-hover);
}
.hero-visual .glass-overlay{
  position:absolute;inset:0;border-radius:var(--radius-card);
  background:linear-gradient(135deg,rgba(11,19,36,0.2) 0%,rgba(16,48,110,0.05) 60%,rgba(45,226,230,0.15) 100%);
  pointer-events:none;
}
.hero-data-card{
  position:absolute;padding:16px 20px;border-radius:14px;
  background:rgba(10,20,45,0.85);border:1px solid rgba(45,226,230,0.25);
  backdrop-filter:blur(14px);box-shadow:var(--shadow-low);min-width:160px;
}
.hero-data-card .data-label{font-size:12px;color:var(--c-text-3);margin-bottom:4px}
.hero-data-card .data-value{font-size:18px;font-weight:700;color:var(--c-cyan)}
.hero-data-card .data-bar{height:4px;background:rgba(255,255,255,0.1);border-radius:4px;margin-top:8px;overflow:hidden}
.hero-data-card .data-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--c-cyan),#1A4C9B);border-radius:4px}
.card-a{top:24px;left:-24px}
.card-b{bottom:30px;right:-14px}
.hero-bottom-line{position:absolute;bottom:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(45,226,230,0.3),transparent)}
/* ===== Products Grid ===== */
.products{background:var(--c-bg);padding:var(--spacing-section) 0}
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.product-card{
  background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-card);
  overflow:hidden;transition:transform .3s ease-out,border-color .3s ease-out,box-shadow .3s ease-out;
  position:relative;
}
.product-card:hover{transform:translateY(-4px);border-color:rgba(45,226,230,0.4);box-shadow:var(--shadow-hover)}
.product-card .thumb{height:180px;overflow:hidden;position:relative}
.product-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease-out}
.product-card:hover .thumb img{transform:scale(1.03)}
.product-card .tag{position:absolute;top:12px;left:12px;background:var(--c-amber);color:#3A2400;font-size:12px;font-weight:600;padding:3px 10px;border-radius:var(--radius-pill);z-index:2}
.product-card .body{padding:24px 24px 22px}
.product-card h3{font-size:clamp(1.05rem,1.6vw,1.2rem);font-weight:600;margin-bottom:10px}
.product-card .desc{font-size:14px;color:var(--c-text-2);line-height:1.6;margin-bottom:16px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.product-card .spec{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;color:var(--c-text-3);border-top:1px solid rgba(255,255,255,0.07);padding-top:14px;margin-bottom:14px}
.product-card .spec span{white-space:nowrap}
.product-actions{display:flex;align-items:center;justify-content:space-between}
.btn-pickup{font-size:14px;color:var(--c-cyan);font-weight:500;display:inline-flex;align-items:center;gap:4px;transition:color .2s}
.btn-pickup:hover{color:var(--c-text)}
.btn-add{width:38px;height:38px;border-radius:50%;border:1px solid rgba(45,226,230,0.4);display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--c-cyan);transition:background .25s,transform .25s}
.btn-add:hover{background:rgba(45,226,230,0.2);transform:scale(1.08)}
/* ===== Testimonials ===== */
.testimonials{background:var(--c-bg-soft);padding:var(--spacing-section) 0}
.testi-grid{position:relative}
.testi-track{display:flex;gap:24px;overflow:hidden;padding:10px 4px}
.testi-card{
  flex:0 0 calc((100% - 48px)/3);background:var(--glass-bg);border:1px solid var(--glass-border);
  border-radius:var(--radius-card);padding:28px;transition:border-color .3s ease;
}
.testi-card.active{border-color:rgba(45,226,230,0.5)}
.testi-card .stars{display:flex;gap:2px;color:var(--c-amber);font-size:14px;margin-bottom:18px;letter-spacing:2px}
.testi-card .quote{font-size:15px;line-height:1.7;color:var(--c-text);margin-bottom:22px}
.testi-card .author{display:flex;align-items:center;gap:12px}
.testi-card .avatar{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,#2DE2E6,#1A4C9B);flex-shrink:0}
.testi-card .author-name{font-size:13px;color:var(--c-text-2)}
.testi-nav{display:flex;gap:10px;position:absolute;top:-2px;right:0}
.testi-nav .nav-btn{width:40px;height:40px;border-radius:50%;background:var(--glass-bg);border:1px solid var(--glass-border);display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--c-text);transition:all .25s}
.testi-nav .nav-btn:hover{background:rgba(45,226,230,0.15);border-color:rgba(45,226,230,0.3);color:var(--c-cyan)}
/* ===== Guarantees ===== */
.guarantees{padding:var(--spacing-section) 0}
.guarantee-box{
  background:var(--c-bg-soft);border:1px solid rgba(255,255,255,0.06);border-radius:16px;
  padding:32px;display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
}
.g-item{text-align:center;padding:12px 8px;transition:transform .25s}
.g-item:hover{transform:translateY(-4px)}
.g-icon{width:48px;height:48px;border-radius:12px;background:rgba(45,226,230,0.12);display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-size:22px;color:var(--c-cyan);transition:background .25s}
.g-item:hover .g-icon{background:rgba(45,226,230,0.2)}
.g-item h3{font-size:16px;font-weight:600;margin-bottom:6px}
.g-item p{font-size:13px;color:var(--c-text-2);line-height:1.5;max-width:180px;margin:0 auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
/* ===== CTA ===== */
.cta{
  padding:var(--spacing-section) 0;position:relative;overflow:hidden;
  background:radial-gradient(ellipse at 60% 50%,#102A5C 0%,var(--c-bg) 70%);
}
.cta::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(120deg,rgba(45,226,230,0.08),transparent 40%,transparent 70%,rgba(45,226,230,0.08));pointer-events:none}
.cta-inner{max-width:760px;margin:0 auto;text-align:center;position:relative;z-index:2}
.cta h2{font-size:clamp(1.7rem,3.5vw,2.4rem);font-weight:700;margin-bottom:14px}
.cta p{color:var(--c-text-2);font-size:16px;margin-bottom:36px}
.cta-form{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}
.cta-form input,.cta-form .select-wrap{flex:1;min-width:170px;max-width:220px}
.cta-form .select-wrap{position:relative;max-width:240px}
.cta-form input,.select-trigger{
  width:100%;height:48px;padding:0 16px;border-radius:var(--radius-input);
  background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.15);
  font-size:14px;color:var(--c-text);transition:border-color .25s,box-shadow .25s;
}
.cta-form input::placeholder{color:var(--c-text-3)}
.cta-form input:focus,.select-trigger:focus{border-color:rgba(45,226,230,0.6);box-shadow:0 0 0 4px rgba(45,226,230,0.1)}
.select-trigger{display:flex;align-items:center;justify-content:space-between;cursor:pointer;text-align:left;font-size:14px;color:var(--c-text-2)}
.select-trigger .chevron{transition:transform .3s;font-size:10px;color:var(--c-text-3)}
.select-panel{
  position:absolute;top:calc(100% + 6px);left:0;right:0;z-index:20;display:none;
  background:rgba(6,13,30,0.97);border:1px solid rgba(255,255,255,0.12);border-radius:12px;
  padding:6px;box-shadow:var(--shadow-hover);backdrop-filter:blur(16px);
}
.select-panel.open{display:block}
.select-panel a{display:block;padding:10px 14px;border-radius:8px;font-size:14px;color:var(--c-text-2);transition:background .2s,color .2s}
.select-panel a:hover{background:rgba(45,226,230,0.1);color:var(--c-cyan)}
.btn-submit{
  height:48px;padding:0 30px;border-radius:var(--radius-btn);background:var(--c-cyan);color:#0A1F44;
  font-size:15px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  transition:box-shadow .25s,transform .25s;border:none;
}
.btn-submit:hover{box-shadow:0 0 24px rgba(45,226,230,0.45);transform:translateY(-2px)}
.btn-submit .spinner{width:16px;height:16px;border:2px solid rgba(10,31,68,0.3);border-top-color:#0A1F44;border-radius:50%;display:none;animation:spin .7s linear infinite}
.btn-submit.loading .spinner{display:inline-block}
.btn-submit.loading .btn-text{display:none}
.btn-submit.success .btn-text{display:none}
.btn-submit.success::after{content:'✓';font-size:18px}
@keyframes spin{to{transform:rotate(360deg)}}
.cta-privacy{font-size:13px;color:var(--c-text-3);margin-top:18px}
/* ===== News ===== */
.news{padding:var(--spacing-section) 0;background:var(--c-bg)}
.news-body{display:grid;grid-template-columns:8fr 4fr;gap:32px}
.news-list{display:flex;flex-direction:column;gap:16px}
.news-item{
  display:flex;gap:20px;background:var(--glass-bg);border:1px solid var(--glass-border);
  border-radius:var(--radius-card);padding:20px;transition:border-color .3s ease,transform .3s ease;
}
.news-item:hover{border-color:rgba(45,226,230,0.35);transform:translateY(-2px)}
.news-item .thumb{flex:0 0 96px;height:96px;border-radius:10px;overflow:hidden}
.news-item .thumb img{width:100%;height:100%;object-fit:cover}
.news-info{flex:1;display:flex;flex-direction:column;gap:6px;min-width:0}
.news-info h3{font-size:16px;font-weight:600;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color .2s}
.news-item:hover .news-info h3{color:var(--c-cyan)}
.news-info .summary{font-size:13px;color:var(--c-text-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.5}
.news-meta{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--c-text-3);margin-top:2px}
.news-meta .read-more{color:var(--c-cyan);font-weight:500;transition:transform .2s,color .2s;display:inline-block}
.news-meta .read-more:hover{transform:translateX(4px)}
.empty-state{
  padding:60px 20px;text-align:center;background:var(--glass-bg);border:1px solid var(--glass-border);
  border-radius:var(--radius-card);color:var(--c-text-3);font-size:15px;
}
.news-side{display:flex;flex-direction:column;gap:14px}
.news-side h3{font-size:15px;font-weight:600;color:var(--c-text);margin-bottom:6px}
.side-item{display:flex;gap:14px;background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:12px;padding:12px;transition:border-color .2s}
.side-item:hover{border-color:rgba(45,226,230,0.3)}
.side-item .thumb{flex:0 0 64px;height:64px;border-radius:8px;overflow:hidden}
.side-item .thumb img{width:100%;height:100%;object-fit:cover}
.side-item .info{flex:1;min-width:0}
.side-item .info h4{font-size:13px;font-weight:500;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color .2s}
.side-item:hover .info h4{color:var(--c-cyan)}
.side-item .info time{font-size:12px;color:var(--c-text-3)}
/* ===== Footer ===== */
.site-footer{background:var(--c-bg-deep);border-top:1px solid rgba(255,255,255,0.05);padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px}
.footer-brand .logo{margin-bottom:12px}
.footer-desc{font-size:13px;color:var(--c-text-3);line-height:1.7;max-width:280px}
.footer-col h3{font-size:15px;font-weight:600;margin-bottom:16px;color:var(--c-text)}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{font-size:13px;color:var(--c-text-2);transition:color .2s}
.footer-col ul a:hover{color:var(--c-cyan)}
.footer-contact li{font-size:13px;color:var(--c-text-2);display:flex;align-items:center;gap:8px;margin-bottom:10px}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.05);padding:18px 0;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:var(--c-text-3)}
/* ===== Responsive ===== */
@media (max-width:1199px){
  .product-grid{grid-template-columns:repeat(3,1fr)}
  .container{padding:0 24px}
}
@media (max-width:991px){
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .news-body{grid-template-columns:1fr}
  .guarantee-box{grid-template-columns:repeat(2,1fr)}
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero-visual{min-height:320px}
  .hero-visual .back-img{height:320px}
  .card-a{left:0}
  .card-b{right:0}
  .testi-card{flex-basis:calc((100% - 24px)/2)}
}
@media (max-width:767px){
  .main-nav{display:none}
  .nav-toggle{display:flex}
  .site-header .search-box{display:none}
  .header-cta{display:none}
  .mobile-open .main-nav{
    display:flex;flex-direction:column;align-items:center;gap:8px;padding:40px 0;
    position:fixed;top:60px;left:0;right:0;bottom:0;z-index:999;
    background:rgba(6,13,30,0.97);backdrop-filter:blur(24px);
  }
  .mobile-open .main-nav .nav-link{font-size:18px;padding:14px 20px}
  .mobile-open .header-actions{display:flex;flex-direction:column;align-items:center;gap:16px}
  .mobile-open .header-actions .search-box{display:block;width:80%}
  .mobile-open .header-actions .header-cta{display:inline-flex}
  .product-grid{grid-template-columns:1fr;max-width:400px;margin:0 auto}
  .testi-card{flex-basis:100%}
  .guarantee-box{grid-template-columns:1fr 1fr}
  .cta-form{flex-direction:column;align-items:stretch}
  .cta-form input,.cta-form .select-wrap{max-width:none;width:100%}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px}
  .hero{padding:56px 0 70px}
  .hero-stats{gap:20px}
}
@media (max-width:520px){
  .container{padding:0 16px}
  .product-card{padding:0}
  .section-head{flex-direction:column;align-items:flex-start;gap:10px}
  hr{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:center;text-align:center}
}

/* roulang page: article */
/* ============ Design Variables ============ */
:root {
  --bg-body: #0B1324;
  --bg-footer: #060D1E;
  --bg-deep: #081126;
  --bg-elev: #0F1B33;
  --primary: #10306E;
  --primary-light: #1A4C9B;
  --accent: #2DE2E6;
  --amber: #FFB454;
  --text-1: #EAF2FF;
  --text-2: #9FB6D9;
  --text-3: #6680A8;
  --glass-bg: rgba(255,255,255,0.06);
  --glass-border: rgba(255,255,255,0.12);
  --radius-card: 16px;
  --radius-btn: 12px;
  --radius-pill: 999px;
  --shadow-low: 0 4px 20px rgba(0,0,0,0.25);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.4);
  --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
  --container-w: 1200px;
  --transition: 0.3s ease-out;
}

/* ============ Reset ============ */
*, *::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);
  background: var(--bg-body);
  color: var(--text-1);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; font-size: 1rem; }

/* Focus visible */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============ Container ============ */
.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 20px;
}

/* ============ Header / Nav ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,19,36,0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  background: rgba(6,13,30,0.92);
  box-shadow: 0 8px 32px rgba(0,0,0,0.35);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
  transition: height var(--transition);
}
.site-header.scrolled .header-inner { height: 60px; }

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--text-1);
  white-space: nowrap;
}
.logo:hover { color: var(--accent); }
.logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: linear-gradient(135deg, #2DE2E6, #1A4C9B);
  color: #0A1F44;
  font-weight: 800;
  font-size: 18px;
  box-shadow: 0 0 18px rgba(45,226,230,0.35);
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-2);
  position: relative;
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--text-1); background: rgba(255,255,255,0.05); }
.nav-link.active {
  color: var(--text-1);
  background: rgba(45,226,230,0.1);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent), var(--primary-light));
  box-shadow: 0 0 12px rgba(45,226,230,0.5);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-box {
  position: relative;
  width: 220px;
  transition: width var(--transition);
}
.search-box:focus-within { width: 280px; }
.search-box .icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  color: var(--text-3);
  pointer-events: none;
}
.search-box input {
  width: 100%;
  height: 40px;
  padding: 0 14px 0 36px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.08);
  color: var(--text-1);
  font-size: 14px;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  outline: none;
}
.search-box input::placeholder { color: var(--text-3); }
.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(45,226,230,0.25);
  background: rgba(255,255,255,0.1);
}
.search-suggest {
  position: absolute;
  top: 48px;
  left: 0;
  width: 100%;
  background: rgba(6,13,30,0.95);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 8px;
  box-shadow: var(--shadow-hover);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 10;
}
.search-suggest.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.search-suggest a {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-2);
  transition: background var(--transition), color var(--transition);
}
.search-suggest a:hover { background: rgba(45,226,230,0.1); color: var(--accent); }

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 20px;
  border-radius: var(--radius-btn);
  background: var(--accent);
  color: #0A1F44;
  font-weight: 700;
  font-size: 14px;
  white-space: nowrap;
  transition: box-shadow var(--transition), transform var(--transition);
}
.header-cta:hover {
  color: #0A1F44;
  box-shadow: 0 0 24px rgba(45,226,230,0.45);
  transform: translateY(-2px);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(255,255,255,0.08);
  color: var(--text-1);
  font-size: 18px;
  transition: background var(--transition);
}
.nav-toggle:hover { background: rgba(45,226,230,0.15); }

/* ============ Breadcrumb ============ */
.breadcrumb-wrap {
  background: transparent;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0;
  font-size: 14px;
  color: var(--text-3);
  max-width: 780px;
  margin: 0 auto;
}
.breadcrumb a { color: var(--text-3); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: rgba(255,255,255,0.2); }
.breadcrumb .crumb-current {
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

/* ============ Article Main ============ */
.article-main {
  padding: 48px 0 64px;
}
.article-container {
  max-width: 780px;
}
.article-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: 48px;
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-low);
}
.article-header {
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 28px;
  margin-bottom: 32px;
}
.article-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text-1);
  margin-bottom: 16px;
}
.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
  color: var(--text-3);
}
.meta-category {
  background: rgba(45,226,230,0.15);
  color: var(--accent);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
}
.meta-time, .meta-views {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ============ Article Content Body ============ */
.article-body {
  color: var(--text-1);
  font-size: 16px;
  line-height: 1.75;
}
.article-body p {
  margin-bottom: 24px;
  color: var(--text-1);
}
.article-body h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-1);
  margin: 40px 0 12px;
  line-height: 1.4;
}
.article-body h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-1);
  margin: 32px 0 10px;
  line-height: 1.4;
}
.article-body blockquote {
  border-left: 4px solid var(--accent);
  background: rgba(45,226,230,0.06);
  padding: 16px 20px;
  border-radius: 0 12px 12px 0;
  margin: 24px 0;
  color: var(--text-2);
  font-style: normal;
}
.article-body blockquote p { margin-bottom: 0; }
.article-body ul, .article-body ol {
  padding-left: 1.5em;
  margin: 16px 0 24px;
}
.article-body li {
  margin-bottom: 12px;
  color: var(--text-2);
  line-height: 1.75;
}
.article-body li::marker { color: var(--accent); }
.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin: 24px 0;
  border: 1px solid rgba(255,255,255,0.08);
}
.article-body figure {
  margin: 24px 0;
}
.article-body figcaption {
  font-size: 14px;
  color: var(--text-3);
  text-align: center;
  margin-top: 8px;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
}
.article-body th {
  background: var(--bg-elev);
  color: var(--text-1);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.article-body td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  color: var(--text-2);
}
.article-body tr:nth-child(even) td {
  background: rgba(255,255,255,0.02);
}
.article-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.article-body a:hover { text-decoration-color: var(--amber); }
.article-body hr {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.1);
  margin: 32px 0;
}
.article-body strong { color: var(--text-1); font-weight: 600; }
.article-body code {
  background: rgba(45,226,230,0.1);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}
.article-body pre {
  background: var(--bg-elev);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
  line-height: 1.6;
}

/* ============ Article Not Found ============ */
.article-not-found {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-2);
}
.not-found-icon {
  font-size: 40px;
  margin-bottom: 16px;
  opacity: 0.6;
}
.article-not-found .btn-primary {
  display: inline-flex;
  margin-top: 24px;
}

/* ============ Buttons ============ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  padding: 0 24px;
  border-radius: var(--radius-btn);
  background: var(--accent);
  color: #0A1F44;
  font-weight: 600;
  font-size: 15px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.btn-primary:hover {
  color: #0A1F44;
  box-shadow: 0 0 24px rgba(45,226,230,0.4);
  transform: translateY(-2px);
}

/* ============ Related Section ============ */
.related-section {
  padding: 64px 0 80px;
  background: linear-gradient(180deg, transparent, rgba(6,13,30,0.5));
}
.related-section .section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}
.related-section .section-head h2 {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--text-1);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  display: flex;
  gap: 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: 16px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
}
.related-card img {
  width: 96px;
  height: 76px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
}
.related-body {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
}
.related-body h3 {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-1);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition);
}
.related-card:hover .related-body h3 { color: var(--accent); }
.related-body span {
  font-size: 13px;
  color: var(--text-3);
}
.related-footer {
  text-align: center;
  margin-top: 40px;
}
.back-list-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 42px;
  padding: 0 28px;
  border-radius: var(--radius-btn);
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.04);
  color: var(--text-1);
  font-size: 14px;
  font-weight: 500;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}
.back-list-btn:hover {
  border-color: var(--accent);
  background: rgba(45,226,230,0.1);
  color: var(--accent);
}

/* ============ Footer ============ */
.site-footer {
  background: var(--bg-footer);
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 64px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .logo {
  margin-bottom: 12px;
}
.footer-desc {
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.7;
  margin-top: 12px;
}
.footer-col h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; }
.footer-col li {
  margin-bottom: 10px;
}
.footer-col a {
  font-size: 14px;
  color: var(--text-2);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }
.footer-contact li {
  font-size: 14px;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  border-top: 1px solid rgba(255,255,255,0.05);
  font-size: 13px;
  color: var(--text-3);
}

/* ============ Responsive ============ */
@media (max-width: 992px) {
  .search-box { width: 180px; }
  .search-box:focus-within { width: 220px; }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .header-inner { height: 64px; }
  .site-header.scrolled .header-inner { height: 56px; }
  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 88%;
    max-width: 360px;
    height: 100vh;
    background: rgba(6,13,30,0.97);
    backdrop-filter: blur(24px);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 100px 32px 40px;
    gap: 8px;
    transform: translateX(100%);
    transition: transform 0.4s ease-out;
    z-index: 99;
    box-shadow: -10px 0 40px rgba(0,0,0,0.5);
  }
  .main-nav.open { transform: translateX(0); }
  .nav-link {
    font-size: 18px;
    padding: 12px 16px;
    width: 100%;
    border-radius: 10px;
  }
  .nav-link.active { background: rgba(45,226,230,0.12); }
  .nav-link.active::after { display: none; }
  .search-box { width: 100%; }
  .search-box:focus-within { width: 100%; }
  .header-actions {
    gap: 8px;
  }
  .header-actions .search-box { display: none; }
  .main-nav.open .search-box {
    display: block;
    margin: 16px 0;
    width: 100%;
  }
  .header-cta {
    height: 38px;
    padding: 0 14px;
    font-size: 13px;
  }
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
  }
  .search-suggest {
    width: 100%;
    left: 0;
    top: 46px;
  }
  .breadcrumb { padding: 12px 0; font-size: 13px; }
  .crumb-current { max-width: 120px; }
  .article-main { padding: 32px 0 48px; }
  .article-card { padding: 28px 20px; }
  .article-header h1 { font-size: 1.6rem; }
  .related-grid { grid-template-columns: 1fr; }
  .related-section { padding: 48px 0 64px; }
  .related-card img { width: 84px; height: 68px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; padding-bottom: 32px; }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  .article-body table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .header-cta { display: none; }
  .logo { font-size: 16px; }
  .logo-icon { width: 32px; height: 32px; font-size: 16px; }
  .article-header h1 { font-size: 1.4rem; }
  .article-card { padding: 24px 16px; }
  .article-meta { gap: 10px; font-size: 13px; }
  .related-card { padding: 12px; }
  .related-card img { width: 72px; height: 60px; }
  .footer-bottom { flex-direction: column; }
}

/* roulang page: category1 */
:root {
            --c-bg: #0B1324;
            --c-bg-alt: #060D1E;
            --c-bg-soft: #081126;
            --c-primary-1: #10306E;
            --c-primary-2: #1A4C9B;
            --c-cyan: #2DE2E6;
            --c-amber: #FFB454;
            --c-text-1: #EAF2FF;
            --c-text-2: #9FB6D9;
            --c-text-3: #6680A8;
            --c-border: rgba(255, 255, 255, 0.12);
            --c-border-light: rgba(255, 255, 255, 0.08);
            --c-glass-bg: rgba(255, 255, 255, 0.06);
            --radius-card: 16px;
            --radius-btn: 12px;
            --radius-pill: 999px;
            --shadow-low: 0 4px 20px rgba(0, 0, 0, 0.25);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.4);
            --ease: 0.25s ease-out;
            --container-w: 1200px;
            --header-h: 72px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
            background: var(--c-bg);
            color: var(--c-text-1);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        ::selection {
            background: rgba(45, 226, 230, 0.3);
            color: #fff;
        }

        ::-webkit-scrollbar {
            width: 10px;
            height: 10px;
        }
        ::-webkit-scrollbar-track {
            background: #060D1E;
        }
        ::-webkit-scrollbar-thumb {
            background: #1A4C9B;
            border-radius: 999px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #2DE2E6;
        }

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

        a {
            color: inherit;
            text-decoration: none;
        }

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

        input,
        select,
        textarea {
            font-family: inherit;
        }

        .container {
            max-width: var(--container-w);
            margin: 0 auto;
            padding: 0 20px;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.02em;
            color: var(--c-text-1);
            white-space: nowrap;
            transition: color 0.2s ease;
        }

        .logo:hover {
            color: #fff;
        }

        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, #2DE2E6, #1A4C9B);
            color: #0A1F44;
            font-weight: 800;
            font-size: 18px;
            box-shadow: 0 0 16px rgba(45, 226, 230, 0.3);
            flex-shrink: 0;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 19, 36, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--c-border-light);
            transition: background 0.3s ease, box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            background: rgba(6, 13, 30, 0.92);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            transition: height 0.3s ease;
            gap: 20px;
        }

        .site-header.scrolled .header-inner {
            height: 60px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 2px;
            margin-left: 12px;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            border-radius: var(--radius-pill);
            font-size: 15px;
            font-weight: 500;
            color: var(--c-text-2);
            transition: color 0.2s, background 0.2s;
            position: relative;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--c-text-1);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-link.active {
            color: var(--c-text-1);
            background: rgba(45, 226, 230, 0.1);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 22px;
            height: 3px;
            border-radius: 999px;
            background: linear-gradient(90deg, #2DE2E6, #1A4C9B);
            box-shadow: 0 0 8px rgba(45, 226, 230, 0.5);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-left: auto;
        }

        .search-box {
            position: relative;
            width: 220px;
            transition: width 0.3s ease;
        }

        .search-box:focus-within {
            width: 280px;
        }

        .search-box .icon {
            position: absolute;
            left: 13px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 13px;
            opacity: 0.6;
            pointer-events: none;
            line-height: 1;
        }

        .search-box input {
            width: 100%;
            height: 40px;
            border-radius: var(--radius-pill);
            border: 1px solid rgba(255, 255, 255, 0.12);
            background: rgba(255, 255, 255, 0.08);
            padding: 0 14px 0 36px;
            color: var(--c-text-1);
            font-size: 14px;
            outline: none;
            transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
        }

        .search-box input::placeholder {
            color: var(--c-text-3);
        }

        .search-box input:focus {
            border-color: rgba(45, 226, 230, 0.6);
            box-shadow: 0 0 0 3px rgba(45, 226, 230, 0.2), 0 0 16px rgba(45, 226, 230, 0.2);
            background: rgba(255, 255, 255, 0.1);
        }

        .search-suggest {
            position: absolute;
            top: calc(100% + 8px);
            left: 0;
            width: 260px;
            background: rgba(11, 19, 36, 0.94);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid var(--c-border);
            border-radius: 12px;
            padding: 6px 8px;
            display: none;
            box-shadow: var(--shadow-hover);
            z-index: 10;
        }

        .search-suggest.show {
            display: block;
        }

        .search-suggest a {
            display: block;
            padding: 8px 12px;
            border-radius: 8px;
            font-size: 14px;
            color: var(--c-text-2);
            transition: background 0.2s, color 0.2s;
        }

        .search-suggest a:hover {
            background: rgba(45, 226, 230, 0.12);
            color: var(--c-text-1);
        }

        .header-cta {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 40px;
            padding: 0 20px;
            border-radius: var(--radius-pill);
            background: var(--c-cyan);
            color: #0A1F44;
            font-size: 14px;
            font-weight: 700;
            white-space: nowrap;
            transition: box-shadow 0.25s, transform 0.25s;
        }

        .header-cta:hover {
            box-shadow: 0 0 24px rgba(45, 226, 230, 0.45);
            transform: translateY(-2px);
        }

        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 12px;
            border: 1px solid var(--c-border);
            background: rgba(255, 255, 255, 0.08);
            color: var(--c-text-1);
            font-size: 18px;
            align-items: center;
            justify-content: center;
            transition: background 0.2s, border-color 0.2s;
        }

        .nav-toggle:hover {
            background: rgba(45, 226, 230, 0.12);
            border-color: rgba(45, 226, 230, 0.4);
        }

        .breadcrumb {
            padding: 14px 0;
            border-bottom: 1px solid var(--c-border-light);
            background: rgba(6, 13, 30, 0.4);
        }

        .breadcrumb .container {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--c-text-3);
        }

        .breadcrumb a {
            color: var(--c-text-2);
            transition: color 0.2s;
        }

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

        .breadcrumb-sep {
            color: var(--c-text-3);
        }

        .breadcrumb .current {
            color: var(--c-text-1);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .category-hero {
            position: relative;
            padding: 72px 0 56px;
            background: radial-gradient(ellipse at 80% 0%, rgba(16, 42, 92, 0.9) 0%, rgba(11, 19, 36, 1) 60%);
            overflow: hidden;
            border-bottom: 1px solid rgba(45, 226, 230, 0.18);
        }

        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
            background-size: 44px 44px;
            -webkit-mask-image: radial-gradient(ellipse at 70% 20%, black 0%, transparent 70%);
            mask-image: radial-gradient(ellipse at 70% 20%, black 0%, transparent 70%);
            pointer-events: none;
        }

        .category-hero-inner {
            position: relative;
            z-index: 1;
            max-width: 820px;
            margin: 0 auto;
            text-align: center;
        }

        .category-hero-title {
            font-size: clamp(2.4rem, 6vw, 3.6rem);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.01em;
            background: linear-gradient(135deg, #FFFFFF 0%, #B8D0F0 50%, #2DE2E6 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            color: var(--c-text-1);
        }

        @supports not (background-clip: text) {
            .category-hero-title {
                background: none;
                -webkit-text-fill-color: currentColor;
                color: var(--c-text-1);
            }
        }

        .category-hero-subtitle {
            margin: 16px auto 0;
            max-width: 620px;
            font-size: 17px;
            color: var(--c-text-2);
            line-height: 1.75;
        }

        .category-hero-brand {
            margin-top: 10px;
            font-size: 14px;
            color: var(--c-text-3);
            letter-spacing: 0.04em;
        }

        .category-hero .btn-primary {
            margin-top: 28px;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 48px;
            padding: 0 28px;
            border-radius: var(--radius-btn);
            background: linear-gradient(135deg, #2DE2E6, #1A4C9B);
            color: #0A1F44;
            font-size: 15px;
            font-weight: 700;
            box-shadow: 0 2px 16px rgba(45, 226, 230, 0.3);
            transition: box-shadow 0.25s, transform 0.25s, filter 0.25s;
            cursor: pointer;
            border: none;
        }

        .btn-primary:hover {
            box-shadow: 0 0 24px rgba(45, 226, 230, 0.5);
            transform: translateY(-2px);
            filter: brightness(1.1);
        }

        .category-intro {
            padding: 40px 0 0;
        }

        .intro-text {
            max-width: 820px;
            margin: 0 auto;
            text-align: center;
            font-size: 16px;
            color: var(--c-text-2);
            line-height: 1.85;
            padding: 24px 28px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--c-border-light);
            border-radius: var(--radius-card);
        }

        .split-block {
            padding: 56px 0;
        }

        .split-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }

        .split-grid.reversed .split-media {
            order: 2;
        }

        .split-grid.reversed .split-content {
            order: 1;
        }

        .media-wrap {
            position: relative;
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-hover);
        }

        .media-wrap img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            display: block;
            transition: transform 0.6s ease;
        }

        .media-wrap:hover img {
            transform: scale(1.04);
        }

        .media-float-card {
            position: absolute;
            z-index: 2;
            background: rgba(11, 19, 36, 0.78);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(45, 226, 230, 0.35);
            border-radius: 12px;
            padding: 10px 16px;
            font-size: 13px;
            color: var(--c-text-1);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
            white-space: nowrap;
        }

        .media-float-card strong {
            color: var(--c-cyan);
            font-size: 20px;
            font-weight: 800;
            margin-right: 4px;
        }

        .media-float-card.card-tl {
            top: 16px;
            left: 16px;
        }

        .media-float-card.card-br {
            bottom: 16px;
            right: 16px;
        }

        .block-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 5px 14px;
            border-radius: var(--radius-pill);
            background: rgba(45, 226, 230, 0.12);
            color: var(--c-cyan);
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.03em;
            margin-bottom: 16px;
        }

        .block-tag::before {
            content: '';
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--c-cyan);
            box-shadow: 0 0 8px rgba(45, 226, 230, 0.6);
        }

        .split-content h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--c-text-1);
        }

        .split-content p {
            color: var(--c-text-2);
            line-height: 1.75;
            margin-bottom: 14px;
            font-size: 15px;
        }

        .check-list {
            list-style: none;
            margin-top: 12px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
        }

        .check-list li {
            position: relative;
            padding-left: 26px;
            font-size: 14px;
            color: var(--c-text-1);
            line-height: 1.7;
        }

        .check-list li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 6px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: rgba(45, 226, 230, 0.15);
            border: 1.5px solid var(--c-cyan);
        }

        .check-list li::after {
            content: '';
            position: absolute;
            left: 4px;
            top: 10.5px;
            width: 6px;
            height: 3px;
            border-left: 1.5px solid var(--c-cyan);
            border-bottom: 1.5px solid var(--c-cyan);
            transform: rotate(-45deg);
        }

        .wide-block {
            padding: 56px 0;
        }

        .wide-card {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
            box-shadow: var(--shadow-hover);
        }

        .wide-card img {
            width: 100%;
            height: 430px;
            object-fit: cover;
            display: block;
        }

        .wide-content {
            position: absolute;
            inset: 0;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 48px;
            background: linear-gradient(to top, rgba(6, 13, 30, 0.92) 0%, rgba(6, 13, 30, 0.35) 55%, transparent 100%);
        }

        .wide-content h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .wide-content p {
            max-width: 680px;
            color: #B8D0F0;
            font-size: 15px;
            line-height: 1.75;
        }

        .faq-section {
            padding: 56px 0;
        }

        .faq-section .container {
            max-width: 860px;
        }

        .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 32px;
            gap: 16px;
        }

        .section-head h2 {
            font-size: clamp(1.7rem, 3.5vw, 2.4rem);
            font-weight: 700;
            color: var(--c-text-1);
            line-height: 1.3;
        }

        .section-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: var(--c-cyan);
            white-space: nowrap;
            font-weight: 500;
        }

        .section-link .arrow {
            transition: transform 0.3s ease;
            display: inline-block;
        }

        .section-link:hover .arrow {
            transform: translateX(4px);
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .faq-item {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--c-border);
            border-radius: 14px;
            overflow: hidden;
            transition: border-color 0.25s, box-shadow 0.25s;
        }

        .faq-item.open {
            border-color: rgba(45, 226, 230, 0.4);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 20px 24px;
            background: transparent;
            border: none;
            text-align: left;
            color: var(--c-text-1);
            font-size: 16px;
            font-weight: 600;
            line-height: 1.5;
            transition: color 0.25s;
        }

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

        .faq-icon {
            position: relative;
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            margin-left: 16px;
        }

        .faq-icon::before,
        .faq-icon::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 14px;
            height: 2px;
            background: var(--c-cyan);
            border-radius: 2px;
            transform: translate(-50%, -50%);
            transition: transform 0.3s ease;
        }

        .faq-icon::after {
            transform: translate(-50%, -50%) rotate(90deg);
        }

        .faq-item.open .faq-icon::after {
            transform: translate(-50%, -50%) rotate(0deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
        }

        .faq-answer-inner {
            padding: 0 24px 22px;
            border-top: 1px solid rgba(45, 226, 230, 0.2);
        }

        .faq-answer p {
            padding-top: 16px;
            font-size: 14.5px;
            color: var(--c-text-2);
            line-height: 1.75;
        }

        .related-section {
            padding: 56px 0 80px;
        }

        .related-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .related-item {
            display: flex;
            align-items: center;
            gap: 20px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-card);
            padding: 16px;
            transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
        }

        .related-item:hover {
            transform: translateY(-3px);
            border-color: rgba(45, 226, 230, 0.4);
            box-shadow: var(--shadow-hover);
        }

        .related-thumb {
            flex-shrink: 0;
            width: 108px;
            height: 86px;
            border-radius: 12px;
            overflow: hidden;
            background: linear-gradient(135deg, #10306E, #1A4C9B);
        }

        .related-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .related-item:hover .related-thumb img {
            transform: scale(1.06);
        }

        .related-body {
            flex: 1;
            min-width: 0;
        }

        .badge-cyan {
            display: inline-block;
            padding: 3px 10px;
            border-radius: var(--radius-pill);
            background: rgba(45, 226, 230, 0.14);
            color: var(--c-cyan);
            font-size: 12px;
            font-weight: 500;
            margin-bottom: 6px;
        }

        .related-body h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--c-text-1);
            line-height: 1.5;
            margin-bottom: 6px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .related-body h3 a {
            color: var(--c-text-1);
            transition: color 0.2s;
        }

        .related-body h3 a:hover {
            color: var(--c-cyan);
        }

        .related-body p {
            font-size: 14px;
            color: var(--c-text-2);
            line-height: 1.6;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }

        .related-time {
            font-size: 13px;
            color: var(--c-text-3);
            white-space: nowrap;
        }

        .related-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 13px;
            color: var(--c-cyan);
            white-space: nowrap;
            transition: gap 0.25s;
        }

        .related-link:hover {
            gap: 8px;
        }

        .site-footer {
            background: var(--c-bg-alt);
            border-top: 1px solid var(--c-border-light);
            padding: 60px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.4fr;
            gap: 40px;
            padding-bottom: 48px;
        }

        .footer-brand .logo {
            margin-bottom: 14px;
        }

        .footer-desc {
            font-size: 14px;
            color: var(--c-text-3);
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-col h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--c-text-1);
            margin-bottom: 16px;
        }

        .footer-col ul {
            list-style: none;
        }

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

        .footer-col a {
            font-size: 14px;
            color: var(--c-text-2);
            transition: color 0.2s;
        }

        .footer-col a:hover {
            color: var(--c-cyan);
        }

        .footer-contact li {
            font-size: 14px;
            color: var(--c-text-2);
            line-height: 1.7;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 22px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 13px;
            color: var(--c-text-3);
            gap: 16px;
            flex-wrap: wrap;
        }

        :focus-visible {
            outline: 2px solid var(--c-cyan);
            outline-offset: 2px;
            box-shadow: 0 0 0 4px rgba(45, 226, 230, 0.2);
            border-radius: 4px;
        }

        @media (max-width: 1199.98px) {
            .search-box {
                width: 180px;
            }
            .search-box:focus-within {
                width: 220px;
            }
        }

        @media (max-width: 991.98px) {
            .search-box {
                display: none;
            }
            .split-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .split-grid.reversed .split-media {
                order: 0;
            }
            .split-grid.reversed .split-content {
                order: 0;
            }
            .media-wrap img {
                height: 320px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .wide-card img {
                height: 380px;
            }
            .wide-content {
                padding: 32px;
            }
        }

        @media (max-width: 767.98px) {
            .header-inner {
                height: 64px;
            }
            .site-header.scrolled .header-inner {
                height: 58px;
            }
            .main-nav {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(6, 13, 30, 0.97);
                backdrop-filter: blur(24px);
                -webkit-backdrop-filter: blur(24px);
                flex-direction: column;
                align-items: stretch;
                padding: 24px 20px 32px;
                gap: 6px;
                display: none;
                border-bottom: 1px solid var(--c-border);
                box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
                z-index: 999;
            }
            body.nav-open .main-nav {
                display: flex;
            }
            .nav-link {
                padding: 12px 16px;
                font-size: 16px;
                border-radius: 12px;
            }
            .nav-link.active::after {
                bottom: 4px;
            }
            .nav-toggle {
                display: flex;
            }
            .header-cta {
                font-size: 13px;
                padding: 0 14px;
            }
            .category-hero {
                padding: 56px 0 44px;
            }
            .category-hero-subtitle {
                font-size: 16px;
            }
            .split-block,
            .wide-block,
            .faq-section,
            .related-section {
                padding: 40px 0;
            }
            .check-list {
                grid-template-columns: 1fr;
            }
            .related-item {
                gap: 14px;
                padding: 14px;
            }
            .related-thumb {
                width: 96px;
                height: 76px;
            }
            .related-body p {
                -webkit-line-clamp: 2;
                white-space: normal;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 575.98px) {
            .container {
                padding: 0 16px;
            }
            .header-cta {
                display: inline-flex;
                width: 40px;
                padding: 0;
                justify-content: center;
                font-size: 0;
                background: transparent;
                border: 1px solid var(--c-border);
                color: var(--c-text-1);
            }
            .header-cta::after {
                content: '询';
                font-size: 14px;
                font-weight: 600;
            }
            .header-cta:hover {
                background: rgba(45, 226, 230, 0.12);
                box-shadow: none;
                transform: none;
            }
            .media-wrap img {
                height: 240px;
            }
            .media-float-card {
                padding: 8px 12px;
                font-size: 12px;
            }
            .media-float-card strong {
                font-size: 17px;
            }
            .wide-card img {
                height: 300px;
            }
            .wide-content {
                padding: 20px;
            }
            .wide-content h2 {
                font-size: 1.35rem;
            }
            .wide-content p {
                font-size: 14px;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 15px;
            }
            .faq-answer-inner {
                padding: 0 18px 18px;
            }
            .related-body h3 {
                font-size: 14.5px;
            }
            .related-body p {
                font-size: 13px;
            }
            .related-footer {
                flex-direction: column;
                align-items: flex-start;
                gap: 4px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .intro-text {
                padding: 18px 20px;
                font-size: 15px;
            }
        }

/* roulang page: category2 */
:root {
  --bg-main: #0B1324;
  --bg-deep: #060D1E;
  --brand-dark: #10306E;
  --brand-mid: #1A4C9B;
  --cyan: #2DE2E6;
  --amber: #FFB454;
  --text-main: #EAF2FF;
  --text-sub: #9FB6D9;
  --text-weak: #6680A8;
  --glass-bg: rgba(255,255,255,0.06);
  --glass-border: rgba(255,255,255,0.12);
  --line-light: rgba(255,255,255,0.08);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --shadow-low: 0 4px 20px rgba(0,0,0,0.25);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.4);
  --container-w: 1200px;
  --header-h: 72px;
  --header-scroll: 60px;
  --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
}
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-main);
  background-color: var(--bg-main);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img {
  max-width: 100%;
  display: block;
  border: 0;
}
a {
  color: var(--text-main);
  text-decoration: none;
  transition: color .25s ease-out;
}
a:hover {
  color: var(--cyan);
}
ul,
ol {
  list-style: none;
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}
input,
select,
textarea {
  font-family: inherit;
  font-size: 14px;
  outline: none;
}
h1,
h2,
h3,
h4 {
  line-height: 1.3;
  letter-spacing: -0.01em;
}
:focus-visible {
  outline: 2px solid rgba(45,226,230,0.7);
  outline-offset: 2px;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.6);
}
.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 20px;
}
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

/* ===== Top Header / SaaS Command Bar ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(11,19,36,0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: height .3s ease-out, background .3s ease-out, box-shadow .3s ease-out;
}
.site-header.scrolled {
  height: var(--header-scroll);
  background: rgba(6,13,30,0.95);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 20px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--brand-mid), var(--cyan));
  color: #0A1F44;
  font-size: 17px;
  font-weight: 800;
  box-shadow: 0 0 16px rgba(45,226,230,0.15);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav .nav-link {
  position: relative;
  color: var(--text-sub);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 2px;
  white-space: nowrap;
  transition: color .25s;
}
.main-nav .nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--brand-mid));
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .3s ease-out;
  box-shadow: 0 0 12px rgba(45,226,230,0.5);
}
.main-nav .nav-link:hover,
.main-nav .nav-link.active {
  color: #fff;
}
.main-nav .nav-link:hover::after,
.main-nav .nav-link.active::after {
  transform: scaleX(1);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-box {
  position: relative;
  width: 220px;
  transition: width .3s ease-out;
}
.search-box:focus-within {
  width: 280px;
}
.search-box .icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-weak);
  display: flex;
  pointer-events: none;
}
.search-box input {
  width: 100%;
  height: 38px;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 0 36px 0 34px;
  color: var(--text-main);
  font-size: 14px;
  transition: border-color .25s, box-shadow .25s, background .25s;
}
.search-box input::placeholder {
  color: var(--text-weak);
}
.search-box input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 16px rgba(45,226,230,0.15);
  background: rgba(255,255,255,0.1);
}
.search-suggest {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: rgba(11,19,36,0.96);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity .25s, transform .25s, visibility .25s;
  z-index: 50;
  box-shadow: var(--shadow-hover);
}
.search-suggest.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.search-suggest a {
  display: block;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--text-sub);
  font-size: 13px;
  transition: background .2s, color .2s;
}
.search-suggest a:hover {
  background: rgba(45,226,230,0.1);
  color: var(--cyan);
}
.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  padding: 0 22px;
  border-radius: var(--radius-md);
  background: var(--cyan);
  color: #0A1F44 !important;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  transition: transform .25s, box-shadow .25s;
}
.header-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 24px rgba(45,226,230,0.45);
  color: #0A1F44 !important;
}
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.15);
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  transition: background .2s, border-color .2s;
}
.nav-toggle:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--cyan);
}
@media (max-width: 992px) {
  .search-box {
    width: 160px;
  }
  .search-box:focus-within {
    width: 200px;
  }
  .main-nav {
    gap: 16px;
  }
}
@media (max-width: 768px) {
  .site-header {
    height: 60px !important;
  }
  .main-nav {
    position: fixed;
    inset: 0;
    top: 0;
    background: rgba(6,13,30,0.98);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 30px;
    z-index: 999;
    display: none;
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav .nav-link {
    font-size: 22px;
    color: var(--text-main);
  }
  .main-nav .nav-link::after {
    bottom: -4px;
  }
  .header-actions .search-box,
  .header-actions .header-cta {
    display: none;
  }
  .nav-toggle {
    display: inline-flex;
  }
}

/* ===== Breadcrumb ===== */
.breadcrumb-bar {
  padding: 104px 0 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-sub);
  padding-bottom: 16px;
}
.breadcrumb a {
  color: var(--text-sub);
  transition: color .25s;
}
.breadcrumb a:hover {
  color: var(--cyan);
}
.breadcrumb .sep {
  color: var(--text-weak);
}
.breadcrumb .current {
  color: var(--text-weak);
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
@media (max-width: 768px) {
  .breadcrumb-bar {
    padding-top: 76px;
  }
}

/* ===== Category Hero ===== */
.category-hero {
  position: relative;
  padding: 96px 0 88px;
  background: radial-gradient(ellipse at 82% 22%, #102A5C 0%, #0B1324 60%),
              linear-gradient(145deg, rgba(11,19,36,0.72), rgba(11,19,36,0.92)),
              url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  overflow: hidden;
}
.category-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}
.category-hero .container {
  position: relative;
  z-index: 1;
  text-align: left;
  max-width: 980px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(26,76,155,0.3);
  border: 1px solid rgba(45,226,230,0.2);
  color: var(--text-sub);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
}
.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(45,226,230,0.8);
}
.category-hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
}
.hero-brand-line {
  color: var(--text-sub);
  font-size: 15px;
  margin-bottom: 20px;
}
.hero-brand-line strong {
  color: var(--cyan);
  font-weight: 600;
}
.hero-subtitle {
  color: var(--text-sub);
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.7;
  max-width: 560px;
  margin-bottom: 32px;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 32px;
  border-radius: var(--radius-md);
  background: var(--cyan);
  color: #0A1F44 !important;
  font-size: 15px;
  font-weight: 700;
  transition: transform .25s, box-shadow .25s;
  box-shadow: 0 4px 18px rgba(45,226,230,0.2);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 24px rgba(45,226,230,0.45);
  color: #0A1F44 !important;
}
.hero-metrics {
  display: flex;
  gap: 36px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.hero-metrics .metric-num {
  font-size: 26px;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.2;
}
.hero-metrics .metric-label {
  font-size: 13px;
  color: var(--text-weak);
}
@media (max-width: 768px) {
  .category-hero {
    padding: 64px 0 56px;
    text-align: left;
  }
  .category-hero .container {
    text-align: left;
  }
  .hero-metrics {
    gap: 20px;
  }
}

/* ===== Feature Blocks ===== */
.feature-section {
  padding: 80px 0 20px;
}
.feature-block {
  padding: 60px 0 20px;
}
.feature-block.reverse .feature-grid {
  direction: rtl;
}
.feature-block.reverse .feature-grid > * {
  direction: ltr;
}
.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.feature-media {
  position: relative;
}
.feature-media img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: var(--shadow-hover);
}
.float-card {
  position: absolute;
  bottom: 24px;
  right: 24px;
  background: rgba(11,19,36,0.85);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(45,226,230,0.3);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  min-width: 140px;
  box-shadow: var(--shadow-low);
  animation: floatY 4s ease-in-out infinite;
}
.float-card .num {
  font-size: 28px;
  font-weight: 800;
  color: var(--cyan);
  line-height: 1.2;
}
.float-card .txt {
  font-size: 13px;
  color: var(--text-sub);
  margin-top: 4px;
}
.feature-content {
  padding: 10px 0;
}
.feature-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--cyan);
  background: rgba(45,226,230,0.12);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}
.feature-content h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
}
.feature-content p {
  color: var(--text-sub);
  margin-bottom: 16px;
  line-height: 1.75;
}
.feature-content ul {
  margin-top: 16px;
}
.feature-content li {
  position: relative;
  padding-left: 22px;
  color: var(--text-main);
  font-size: 15px;
  margin-bottom: 10px;
  line-height: 1.6;
}
.feature-content li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--brand-mid));
  box-shadow: 0 0 6px rgba(45,226,230,0.5);
}
.feature-full {
  margin-top: 40px;
}
.feature-full .feature-media {
  margin-top: 40px;
}
.feature-full .feature-media img {
  height: 420px;
  width: 100%;
  object-fit: cover;
}
.feature-full .feature-content {
  max-width: 820px;
}
.feature-full .feature-float-left {
  position: absolute;
  left: 24px;
  bottom: 24px;
  right: auto;
}
@media (max-width: 992px) {
  .feature-grid {
    gap: 36px;
  }
  .feature-media img {
    height: 300px;
  }
}
@media (max-width: 768px) {
  .feature-section {
    padding: 40px 0 10px;
  }
  .feature-block {
    padding: 30px 0 10px;
  }
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .feature-block.reverse .feature-grid {
    direction: ltr;
  }
  .feature-media img {
    height: 240px;
  }
  .feature-full .feature-media img {
    height: 260px;
  }
  .float-card {
    bottom: 14px;
    right: 14px;
    padding: 12px 14px;
  }
  .feature-full .feature-float-left {
    left: 14px;
  }
}

/* ===== FAQ Section ===== */
.faq-section {
  padding: 80px 0;
}
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 44px;
}
.section-header h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 700;
  line-height: 1.3;
}
.section-header .sub {
  color: var(--text-sub);
  font-size: 15px;
}
.faq-subtitle {
  color: var(--text-sub);
  font-size: 15px;
  margin-bottom: 32px;
  max-width: 640px;
}
.faq-list {
  max-width: 860px;
}
.faq-item {
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color .25s, background .25s;
}
.faq-item:hover,
.faq-item.active {
  border-color: rgba(45,226,230,0.4);
  background: rgba(255,255,255,0.08);
}
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  transition: color .2s;
}
.faq-q:hover {
  color: var(--cyan);
}
.faq-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid rgba(45,226,230,0.4);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  transition: transform .3s ease-out, background .3s;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: rgba(45,226,230,0.15);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  padding: 0 24px;
  transition: max-height .45s ease-out, padding .3s ease-out;
}
.faq-item.active .faq-a {
  max-height: 600px;
  padding-bottom: 24px;
}
.faq-a-inner {
  padding-top: 18px;
  border-top: 1px solid rgba(45,226,230,0.25);
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.8;
}
.faq-a-inner p + p {
  margin-top: 12px;
}
@media (max-width: 768px) {
  .faq-section {
    padding: 40px 0;
  }
  .faq-q {
    padding: 16px 18px;
    font-size: 15px;
  }
  .faq-a {
    padding: 0 18px;
  }
  .faq-item.active .faq-a {
    padding-bottom: 18px;
  }
}

/* ===== Related Articles ===== */
.related-section {
  padding: 20px 0 80px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform .3s ease-out, border-color .3s, box-shadow .3s;
  display: flex;
  flex-direction: column;
}
.related-card:hover {
  transform: translateY(-4px);
  border-color: rgba(45,226,230,0.4);
  box-shadow: var(--shadow-hover);
}
.related-badge {
  display: inline-self: flex-start;
  width: fit-content;
  font-size: 12px;
  font-weight: 600;
  color: var(--amber);
  background: rgba(255,180,84,0.12);
  border-radius: var(--radius-pill);
  padding: 4px 10px;
  margin-bottom: 14px;
}
.related-card h3 {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color .25s;
}
.related-card:hover h3 {
  color: var(--cyan);
}
.related-card p {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 13px;
  color: var(--text-weak);
}
.related-link {
  color: var(--cyan);
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap .25s;
}
.related-link:hover {
  gap: 8px;
  color: var(--cyan);
}
.related-choice {
  margin-top: 36px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-sub);
  font-size: 14px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-pill);
  padding: 8px 20px;
  transition: border-color .25s, color .25s;
}
.related-choice:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}
@media (max-width: 992px) {
  .related-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 768px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
  .related-card {
    padding: 20px;
  }
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 36px;
}
.footer-brand .logo {
  margin-bottom: 14px;
}
.footer-desc {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.7;
  margin-top: 14px;
  max-width: 260px;
}
.footer-col h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-main);
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col a {
  color: var(--text-sub);
  font-size: 14px;
  transition: color .25s;
}
.footer-col a:hover {
  color: var(--cyan);
}
.footer-contact li {
  color: var(--text-sub);
  font-size: 14px;
  margin-bottom: 12px;
  padding-left: 24px;
  position: relative;
}
.footer-contact li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 6px rgba(45,226,230,0.4);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 24px 0;
  font-size: 13px;
  color: var(--text-weak);
}
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}
@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-bottom: 24px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== Animations ===== */
@keyframes floatY {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}