/* roulang page: index */
:root{
  --primary:#2563EB;
  --primary-dark:#1D4ED8;
  --primary-light:#EFF6FF;
  --accent:#0D9488;
  --accent-light:#CCFBF1;
  --bg-body:#F7FAFD;
  --bg-panel:#F2F6FC;
  --bg-header:#1E2A3A;
  --bg-hero:#16202E;
  --border:#E5EDF8;
  --text-title:#1A2233;
  --text-body:#475569;
  --text-muted:#94A3B8;
  --white:#ffffff;
  --radius-lg:16px;
  --radius-md:10px;
  --radius-sm:6px;
  --shadow-card:0 2px 8px rgba(16,42,84,0.06);
  --shadow-hover:0 8px 24px rgba(16,42,84,0.10);
  --container:1200px;
  --space-section:96px;
  --font-base:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-base);
  font-size:15px;
  line-height:1.7;
  color:var(--text-body);
  background:var(--bg-body);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s ease}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit;font-size:14px}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}

/* ===== Header ===== */
.site-header{
  background:var(--bg-header);
  position:sticky;
  top:0;
  z-index:100;
  box-shadow:0 2px 8px rgba(0,0,0,0.08);
}
.header-inner{
  display:flex;
  align-items:center;
  height:68px;
  gap:32px;
}
.logo{
  display:flex;
  align-items:center;
  gap:10px;
  color:#fff;
  font-size:18px;
  font-weight:700;
  flex-shrink:0;
}
.logo-icon{
  width:36px;
  height:36px;
  background:var(--primary);
  border-radius:8px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:15px;
  color:#fff;
}
.logo-text{letter-spacing:0.5px}
.main-nav{
  display:flex;
  gap:6px;
  flex:1;
}
.nav-link{
  color:#AFC2D9;
  font-size:14px;
  padding:8px 14px;
  border-radius:6px;
  position:relative;
  transition:background .2s,color .2s;
}
.nav-link:hover{
  color:#fff;
  background:rgba(255,255,255,0.08);
}
.nav-link.active{
  color:#fff;
  background:rgba(255,255,255,0.12);
}
.nav-link.active::after{
  content:"";
  position:absolute;
  bottom:3px;
  left:50%;
  transform:translateX(-50%);
  width:16px;
  height:2px;
  background:var(--primary);
  border-radius:2px;
}
.nav-toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  background:none;
  border:none;
  padding:6px;
  margin-left:auto;
}
.nav-toggle span{
  width:22px;
  height:2px;
  background:#fff;
  border-radius:2px;
  transition:all .3s ease;
}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 24px;
  border-radius:8px;
  font-size:15px;
  font-weight:600;
  border:none;
  transition:all .2s ease;
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{
  background:var(--primary-dark);
  transform:translateY(-1px);
  box-shadow:0 6px 16px rgba(37,99,235,0.25);
}
.btn-primary:active{transform:translateY(0)}
.btn-outline{
  background:transparent;
  color:#fff;
  border:1px solid rgba(255,255,255,0.4);
}
.btn-outline:hover{
  background:rgba(255,255,255,0.1);
  border-color:rgba(255,255,255,0.6);
}
.btn-secondary{
  background:var(--white);
  color:var(--primary);
  border:1px solid var(--primary);
}
.btn-secondary:hover{
  background:var(--primary-light);
  color:var(--primary-dark);
}
.btn:focus-visible,
.nav-link:focus-visible,
.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible,
.faq-question:focus-visible{
  outline:2px solid var(--primary);
  outline-offset:2px;
}

/* ===== Hero ===== */
.hero{
  background:var(--bg-hero);
  position:relative;
  overflow:hidden;
}
.hero-bg{
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-1.jpg');
  background-size:cover;
  background-position:center;
  opacity:0.35;
}
.hero-bg::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,rgba(22,32,46,0.94) 0%,rgba(22,32,46,0.78) 55%,rgba(22,32,46,0.55) 100%);
}
.hero-inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.1fr 0.9fr;
  gap:64px;
  padding-top:80px;
  padding-bottom:72px;
  align-items:center;
}
.hero-content{color:#fff}
.hero-badge{
  display:inline-block;
  font-size:13px;
  color:#BFDBFE;
  background:rgba(37,99,235,0.2);
  border:1px solid rgba(59,130,246,0.35);
  padding:4px 14px;
  border-radius:999px;
  margin-bottom:20px;
}
.hero h1{
  font-size:32px;
  line-height:1.35;
  color:#fff;
  font-weight:700;
  margin-bottom:16px;
}
.hero-sub{
  font-size:15px;
  color:#C7D4E3;
  margin-bottom:28px;
  max-width:520px;
}
.hero-actions{
  display:flex;
  gap:12px;
  margin-bottom:36px;
  flex-wrap:wrap;
}
.hero-stats{
  display:flex;
  gap:24px;
  flex-wrap:wrap;
  padding-top:20px;
  border-top:1px solid rgba(255,255,255,0.14);
}
.hero-stats span{
  font-size:13px;
  color:#D3E0F0;
  padding-left:18px;
  position:relative;
}
.hero-stats span::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--accent);
}
.hero-panel{
  background:var(--white);
  border-radius:16px;
  padding:24px;
  box-shadow:0 8px 32px rgba(0,0,0,0.22);
}
.panel-head{
  color:var(--text-title);
  font-size:16px;
  font-weight:600;
  margin-bottom:18px;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.panel-head::after{
  content:"每 2 小时更新";
  font-size:12px;
  color:var(--text-muted);
  font-weight:400;
}
.panel-list{display:flex;flex-direction:column;gap:10px}
.panel-item{
  display:flex;
  align-items:center;
  gap:12px;
  background:var(--bg-panel);
  border-radius:8px;
  padding:10px 12px;
}
.rank{
  color:var(--primary);
  font-size:13px;
  font-weight:700;
  width:24px;
  flex-shrink:0;
}
.p-name{
  font-size:14px;
  color:var(--text-title);
  flex:1;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.p-bar{
  width:76px;
  height:6px;
  background:#E2E8F0;
  border-radius:99px;
  overflow:hidden;
  flex-shrink:0;
}
.p-bar i{
  display:block;
  height:100%;
  background:var(--primary);
  border-radius:99px;
}
.panel-link{
  display:block;
  margin-top:16px;
  text-align:center;
  padding:10px;
  border-radius:8px;
  background:var(--primary);
  color:#fff;
  font-size:14px;
  font-weight:600;
  transition:background .2s ease;
}
.panel-link:hover{background:var(--primary-dark)}

/* ===== Section common ===== */
.stats-section,
.compare-section,
.quick-section,
.info-section,
.faq-section{
  padding:var(--space-section) 0;
}
.services-section,
.news-section{
  background:var(--bg-panel);
  padding:var(--space-section) 0;
}
.security-section{
  background:var(--bg-header);
  color:#fff;
  padding:var(--space-section) 0;
  position:relative;
  overflow:hidden;
}
.contact-section{
  background:var(--bg-panel);
  padding:var(--space-section) 0;
}
.app-section{
  padding:var(--space-section) 0;
}
.section-head{
  text-align:center;
  max-width:640px;
  margin:0 auto 48px;
}
.section-tag{
  display:inline-block;
  font-size:12px;
  color:var(--primary);
  background:var(--primary-light);
  padding:4px 12px;
  border-radius:999px;
  margin-bottom:12px;
  font-weight:600;
}
.section-head h2{
  font-size:24px;
  color:var(--text-title);
  margin-bottom:10px;
}
.section-head p{
  font-size:14px;
  color:var(--text-muted);
}

/* ===== Stats ===== */
.stats-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.stat-card{
  background:var(--white);
  border-radius:var(--radius-lg);
  padding:28px;
  box-shadow:var(--shadow-card);
  position:relative;
  overflow:hidden;
  transition:box-shadow .3s ease,transform .3s ease;
}
.stat-card::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:3px;
  background:var(--primary);
  opacity:0;
  transition:opacity .3s ease;
}
.stat-card:hover{
  box-shadow:var(--shadow-hover);
  transform:translateY(-2px);
}
.stat-card:hover::before{opacity:1}
.stat-num{
  font-size:32px;
  font-weight:700;
  color:var(--text-title);
  display:flex;
  align-items:baseline;
  gap:2px;
}
.stat-num span{
  font-size:16px;
  color:var(--primary);
}
.stat-label{
  font-size:13px;
  color:var(--text-muted);
  margin-top:6px;
}
.stat-bar{
  margin-top:16px;
  height:6px;
  background:var(--bg-panel);
  border-radius:99px;
  overflow:hidden;
}
.stat-bar i{
  display:block;
  height:100%;
  background:var(--primary);
  border-radius:99px;
}

/* ===== Services ===== */
.services-grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:24px;
}
.service-card{
  background:var(--white);
  border-radius:var(--radius-lg);
  padding:28px;
  box-shadow:var(--shadow-card);
  transition:box-shadow .3s ease,transform .3s ease;
}
.service-card:hover{
  box-shadow:var(--shadow-hover);
  transform:translateY(-2px);
}
.card-large{grid-column:span 7}
.card-small{grid-column:span 5}
.card-shift-left{grid-column:2 / span 5}
.card-shift-right{grid-column:7 / span 5}
.card-wide-left{grid-column:1 / span 6}
.card-wide-right{grid-column:7 / span 6}
.service-icon{
  width:48px;
  height:48px;
  border-radius:12px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:var(--primary-light);
  color:var(--primary);
  margin-bottom:16px;
  font-size:22px;
}
.service-title{
  font-size:17px;
  font-weight:600;
  color:var(--text-title);
  margin-bottom:8px;
}
.service-desc{
  font-size:14px;
  line-height:1.65;
  color:var(--text-body);
  margin-bottom:14px;
}
.service-tags{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
}
.service-tags span{
  font-size:12px;
  background:var(--bg-panel);
  color:var(--text-muted);
  padding:3px 10px;
  border-radius:999px;
}
.card-img{
  border-radius:10px;
  overflow:hidden;
  margin-bottom:18px;
}
.card-img img{
  width:100%;
  aspect-ratio:16/9;
  object-fit:cover;
}

/* ===== Compare ===== */
.compare-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:48px;
  max-width:960px;
  margin:0 auto;
  position:relative;
}
.compare-vs{
  position:absolute;
  left:50%;
  top:50%;
  transform:translate(-50%,-50%);
  width:56px;
  height:56px;
  background:var(--primary);
  color:#fff;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:14px;
  font-weight:700;
  box-shadow:0 8px 24px rgba(37,99,235,0.25);
  z-index:2;
}
.compare-panel{
  border-radius:var(--radius-lg);
  padding:32px;
}
.compare-panel.bad{background:#F1F5F9}
.compare-panel.good{
  background:var(--white);
  border:1px solid var(--primary);
}
.compare-head{
  font-size:18px;
  font-weight:600;
  color:var(--text-title);
  margin-bottom:20px;
}
.compare-list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:16px;
}
.compare-list li{
  display:flex;
  gap:12px;
  align-items:flex-start;
  font-size:14px;
  line-height:1.6;
  color:var(--text-body);
}
.badge-x{
  width:22px;
  height:22px;
  border-radius:50%;
  background:#E2E8F0;
  color:#64748B;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:12px;
  flex-shrink:0;
  margin-top:2px;
}
.badge-check{
  width:22px;
  height:22px;
  border-radius:50%;
  background:var(--accent-light);
  color:var(--accent);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:12px;
  flex-shrink:0;
  margin-top:2px;
}

/* ===== Timeline ===== */
.timeline{
  max-width:760px;
  margin:0 auto;
  position:relative;
  padding-left:32px;
}
.timeline::before{
  content:"";
  position:absolute;
  left:8px;
  top:0;
  bottom:0;
  width:2px;
  background:var(--border);
}
.timeline-item{
  position:relative;
  padding-bottom:32px;
}
.timeline-item:last-child{padding-bottom:0}
.timeline-dot{
  position:absolute;
  left:-30px;
  top:4px;
  width:16px;
  height:16px;
  border-radius:50%;
  background:var(--primary);
  border:3px solid #fff;
  box-shadow:0 0 0 2px var(--primary-light);
}
.timeline-date{
  font-size:12px;
  color:var(--text-muted);
  margin-bottom:4px;
}
.timeline-title{
  font-size:16px;
  font-weight:600;
  color:var(--text-title);
  margin-bottom:6px;
}
.timeline-text{
  font-size:14px;
  color:var(--text-body);
}

/* ===== Quick ===== */
.quick-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
}
.quick-card{
  background:var(--white);
  border-radius:var(--radius-lg);
  padding:24px;
  box-shadow:var(--shadow-card);
  transition:box-shadow .3s ease;
}
.quick-card:hover{box-shadow:var(--shadow-hover)}
.quick-q{
  font-size:16px;
  font-weight:600;
  color:var(--text-title);
  margin-bottom:8px;
  display:flex;
  gap:10px;
  align-items:center;
}
.quick-q::before{
  content:"";
  width:6px;
  height:20px;
  background:var(--primary);
  border-radius:3px;
  flex-shrink:0;
}
.quick-a{
  font-size:14px;
  color:var(--text-body);
}

/* ===== Info ===== */
.info-layout{
  display:grid;
  grid-template-columns:1.6fr 1fr;
  gap:40px;
}
.info-list{
  display:flex;
  flex-direction:column;
}
.info-item{
  display:flex;
  gap:16px;
  padding:20px 0;
  border-bottom:1px solid var(--border);
  align-items:flex-start;
}
.info-item:last-child{border-bottom:none}
.info-content{flex:1}
.info-title{
  font-size:16px;
  font-weight:600;
  color:var(--text-title);
  margin-bottom:6px;
  line-height:1.5;
}
.info-title a{
  color:inherit;
  transition:color .2s ease;
}
.info-title a:hover{color:var(--primary)}
.info-meta{
  font-size:12px;
  color:var(--text-muted);
}
.info-sidebar{
  background:var(--bg-panel);
  border-radius:var(--radius-lg);
  padding:24px;
}
.sidebar-block{
  margin-bottom:28px;
}
.sidebar-block:last-child{margin-bottom:0}
.sidebar-title{
  font-size:16px;
  font-weight:600;
  color:var(--text-title);
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px solid var(--border);
}
.tag-cloud{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.tag-cloud a{
  font-size:13px;
  background:var(--white);
  border:1px solid var(--border);
  color:var(--text-body);
  padding:4px 12px;
  border-radius:999px;
  transition:all .2s ease;
}
.tag-cloud a:hover{
  border-color:var(--primary);
  color:var(--primary);
  background:var(--primary-light);
}
.sidebar-link-list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.sidebar-link-list li{
  font-size:14px;
  padding-left:16px;
  position:relative;
}
.sidebar-link-list li::before{
  content:"";
  position:absolute;
  left:0;
  top:8px;
  width:6px;
  height:6px;
  border-radius:2px;
  background:var(--primary);
}
.sidebar-link-list a{
  color:var(--text-body);
  transition:color .2s ease;
}
.sidebar-link-list a:hover{color:var(--primary)}

/* ===== Security ===== */
.sec-bg{
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-2.jpg');
  background-size:cover;
  background-position:center;
  opacity:0.14;
}
.security-inner{position:relative;z-index:1}
.security-head{
  text-align:center;
  margin-bottom:48px;
}
.security-head .section-tag{
  background:rgba(37,99,235,0.25);
  color:#BFDBFE;
}
.security-head h2{
  color:#fff;
  font-size:24px;
  margin-bottom:10px;
}
.security-head p{
  color:#AFC2D9;
  font-size:14px;
}
.security-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
}
.security-card{
  background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.1);
  border-radius:var(--radius-lg);
  padding:24px;
  transition:background .3s ease,transform .3s ease;
}
.security-card:hover{
  background:rgba(255,255,255,0.1);
  transform:translateY(-2px);
}
.security-icon{
  width:40px;
  height:40px;
  border-radius:10px;
  background:rgba(37,99,235,0.3);
  color:#BFDBFE;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:14px;
  font-size:20px;
}
.security-title{
  font-size:16px;
  font-weight:600;
  color:#fff;
  margin-bottom:6px;
}
.security-desc{
  font-size:13px;
  color:#AFC2D9;
  line-height:1.6;
}

/* ===== App ===== */
.app-layout{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:48px;
  align-items:center;
}
.app-visual{
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow-hover);
}
.app-visual img{
  width:100%;
  aspect-ratio:16/10;
  object-fit:cover;
}
.app-content .section-tag{margin-bottom:12px}
.app-content h2{
  font-size:24px;
  color:var(--text-title);
  margin-bottom:12px;
}
.app-content p{
  font-size:14px;
  color:var(--text-body);
  margin-bottom:20px;
  max-width:460px;
}
.app-platforms{
  display:flex;
  gap:12px;
  margin-bottom:24px;
  flex-wrap:wrap;
}
.app-platform{
  background:var(--bg-panel);
  border-radius:10px;
  padding:8px 16px;
  font-size:13px;
  color:var(--text-body);
}
.app-btns{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}

/* ===== FAQ ===== */
.faq-list{
  max-width:800px;
  margin:0 auto;
}
.faq-item{
  background:var(--white);
  border-bottom:1px solid var(--border);
}
.faq-item:first-child{border-top:1px solid var(--border)}
.faq-question{
  background:none;
  border:none;
  width:100%;
  text-align:left;
  padding:20px 0;
  font-size:16px;
  font-weight:600;
  color:var(--text-title);
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  transition:color .2s ease;
}
.faq-question:hover{color:var(--primary)}
.faq-icon{
  position:relative;
  width:18px;
  height:18px;
  flex-shrink:0;
}
.faq-icon::before,
.faq-icon::after{
  content:"";
  position:absolute;
  background:var(--text-muted);
  border-radius:2px;
  transition:transform .3s ease,opacity .3s ease;
}
.faq-icon::before{
  width:18px;
  height:2px;
  top:8px;
  left:0;
}
.faq-icon::after{
  width:2px;
  height:18px;
  top:0;
  left:8px;
}
.faq-item.active .faq-icon::before{transform:rotate(180deg)}
.faq-item.active .faq-icon::after{transform:scaleY(0);opacity:0}
.faq-answer{
  max-height:0;
  overflow:hidden;
  transition:max-height .35s ease;
}
.faq-answer-inner{
  padding:0 0 20px;
  font-size:14px;
  line-height:1.7;
  color:var(--text-body);
}

/* ===== Contact ===== */
.contact-layout{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:48px;
  align-items:center;
}
.contact-info h2{
  font-size:24px;
  color:var(--text-title);
  margin-bottom:12px;
}
.contact-info p{
  font-size:14px;
  color:var(--text-body);
  margin-bottom:20px;
}
.contact-list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:8px;
}
.contact-list li{
  display:flex;
  gap:10px;
  align-items:center;
  font-size:14px;
  color:var(--text-body);
  padding:6px 0;
}
.ci-icon{
  width:20px;
  height:20px;
  border-radius:50%;
  background:var(--primary-light);
  color:var(--primary);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:11px;
  flex-shrink:0;
}
.contact-form-card{
  background:var(--bg-panel);
  border-radius:var(--radius-lg);
  padding:32px;
  box-shadow:var(--shadow-card);
}
.form-group{
  margin-bottom:20px;
}
.form-label{
  display:block;
  font-size:14px;
  font-weight:600;
  color:var(--text-title);
  margin-bottom:6px;
}
.form-input,
.form-select,
.form-textarea{
  width:100%;
  padding:10px 14px;
  border:1px solid var(--border);
  border-radius:8px;
  background:var(--white);
  color:var(--text-title);
  transition:border-color .2s ease,outline .2s ease;
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus{
  outline:2px solid var(--primary);
  outline-offset:2px;
  border-color:var(--primary);
}
.form-textarea{
  min-height:90px;
  resize:vertical;
}
.form-submit{
  width:100%;
  color:#fff;
}

/* ===== Footer ===== */
.site-footer{
  background:var(--bg-header);
  color:#AFC2D9;
  padding:56px 0 0;
  font-size:14px;
}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1.2fr;
  gap:40px;
  padding-bottom:40px;
}
.footer-brand .logo{
  color:#fff;
  margin-bottom:14px;
  font-size:18px;
}
.footer-brand p{
  font-size:13px;
  line-height:1.7;
  max-width:280px;
}
.footer-title{
  font-size:15px;
  font-weight:600;
  color:#fff;
  margin-bottom:16px;
}
.footer-links{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:8px;
}
.footer-links a{
  color:#AFC2D9;
  font-size:14px;
  transition:color .2s ease;
}
.footer-links a:hover{color:var(--primary)}
.footer-contact{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:8px;
  font-size:13px;
  color:#AFC2D9;
}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.08);
  padding:20px 0;
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:12px;
  color:#7B8EA7;
  gap:12px;
  flex-wrap:wrap;
}

/* ===== Responsive ===== */
@media (max-width:1023px){
  .hero-inner{
    grid-template-columns:1fr;
    gap:40px;
  }
  .hero h1{font-size:28px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .info-layout{grid-template-columns:1fr}
  .contact-layout{grid-template-columns:1fr}
  .app-layout{grid-template-columns:1fr}
  .security-grid{grid-template-columns:repeat(2,1fr)}
  .card-large,
  .card-small,
  .card-shift-left,
  .card-shift-right,
  .card-wide-left,
  .card-wide-right{
    grid-column:span 6;
  }
}
@media (max-width:768px){
  :root{--space-section:56px}
  .header-inner{height:60px;gap:16px}
  .main-nav{
    display:none;
    position:absolute;
    top:60px;
    left:0;
    right:0;
    background:var(--bg-header);
    padding:12px 24px 20px;
    flex-direction:column;
    gap:4px;
    box-shadow:0 8px 16px rgba(0,0,0,0.2);
  }
  .main-nav.open{display:flex}
  .nav-link{
    display:block;
    padding:12px 14px;
    border-radius:8px;
  }
  .nav-toggle{
    display:flex;
    margin-left:auto;
  }
  .hero-inner{padding-top:56px;padding-bottom:48px}
  .hero h1{font-size:26px}
  .hero-sub{font-size:14px}
  .hero-stats{
    flex-direction:column;
    gap:10px;
  }
  .hero-panel{padding:20px}
  .stats-grid{
    grid-template-columns:1fr 1fr;
    gap:16px;
  }
  .stat-card{padding:20px}
  .stat-num{font-size:26px}
  .services-grid{
    grid-template-columns:1fr;
  }
  .card-large,
  .card-small,
  .card-shift-left,
  .card-shift-right,
  .card-wide-left,
  .card-wide-right{
    grid-column:1 / -1;
  }
  .compare-grid{
    grid-template-columns:1fr;
    gap:24px;
  }
  .compare-vs{display:none}
  .compare-panel{padding:24px}
  .quick-grid{grid-template-columns:1fr}
  .security-grid{grid-template-columns:1fr}
  .app-platforms{flex-direction:column;align-items:flex-start}
  .footer-grid{
    grid-template-columns:1fr;
    gap:32px;
  }
  .footer-bottom{
    flex-direction:column;
    text-align:center;
  }
  .contact-form-card{padding:24px}
  .info-item{
    flex-direction:column;
  }
  .info-thumb{
    width:100%;
    height:auto;
  }
}
@media (max-width:520px){
  .container{padding:0 16px}
  .stats-grid{
    grid-template-columns:1fr 1fr;
    gap:12px;
  }
  .stat-card{padding:16px}
  .stat-num{font-size:22px}
  .section-head h2{
    font-size:20px;
  }
  .hero-actions .btn{
    width:100%;
  }
  .panel-bar{display:none}
  .p-bar{width:54px}
  .btn{padding:10px 18px;font-size:14px}
}

/* roulang page: category1 */
:root{
  --primary:#2563EB;
  --primary-dark:#1D4ED8;
  --primary-light:#EFF6FF;
  --accent:#0D9488;
  --accent-light:#CCFBF1;
  --bg-body:#F7FAFD;
  --bg-panel:#F2F6FC;
  --bg-header:#1E2A3A;
  --bg-hero:#16202E;
  --border:#E5EDF8;
  --text-title:#1A2233;
  --text-body:#475569;
  --text-muted:#94A3B8;
  --white:#ffffff;
  --radius-lg:16px;
  --radius-md:10px;
  --radius-sm:6px;
  --shadow-card:0 2px 8px rgba(16,42,84,0.06);
  --shadow-hover:0 8px 24px rgba(16,42,84,0.10);
  --container:1200px;
  --space-section:96px;
  --font-base:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-base);
  font-size:15px;
  line-height:1.7;
  color:var(--text-body);
  background:var(--bg-body);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s ease}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit;font-size:14px}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
/* ===== Header ===== */
.site-header{
  background:var(--bg-header);
  position:sticky;
  top:0;
  z-index:100;
  box-shadow:0 2px 8px rgba(0,0,0,0.08);
}
.header-inner{
  display:flex;
  align-items:center;
  height:68px;
  gap:32px;
}
.logo{
  display:flex;
  align-items:center;
  gap:10px;
  color:#fff;
  font-size:18px;
  font-weight:700;
  flex-shrink:0;
}
.logo-icon{
  width:36px;
  height:36px;
  background:var(--primary);
  border-radius:8px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:15px;
  color:#fff;
}
.logo-text{letter-spacing:0.5px}
.main-nav{
  display:flex;
  gap:6px;
  flex:1;
}
.nav-link{
  color:#AFC2D9;
  font-size:14px;
  padding:8px 14px;
  border-radius:6px;
  position:relative;
  transition:background .2s,color .2s;
}
.nav-link:hover{
  color:#fff;
  background:rgba(255,255,255,0.08);
}
.nav-link.active{
  color:#fff;
  background:rgba(255,255,255,0.12);
}
.nav-link.active::after{
  content:"";
  position:absolute;
  bottom:3px;
  left:50%;
  transform:translateX(-50%);
  width:16px;
  height:2px;
  background:var(--primary);
  border-radius:2px;
}
.nav-toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  background:none;
  border:none;
  padding:6px;
  margin-left:auto;
}
.nav-toggle span{
  width:22px;
  height:2px;
  background:#fff;
  border-radius:2px;
  transition:all .3s ease;
}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* ===== Buttons ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 24px;
  border-radius:8px;
  font-size:15px;
  font-weight:600;
  border:none;
  transition:all .2s ease;
  gap:6px;
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{
  background:var(--primary-dark);
  transform:translateY(-1px);
  box-shadow:0 6px 16px rgba(37,99,235,0.25);
}
.btn-primary:active{transform:translateY(0)}
.btn-outline{
  background:transparent;
  color:#fff;
  border:1px solid rgba(255,255,255,0.4);
}
.btn-outline:hover{
  background:rgba(255,255,255,0.1);
  border-color:rgba(255,255,255,0.6);
}
.btn-secondary{
  background:var(--white);
  color:var(--primary);
  border:1px solid var(--primary);
}
.btn-secondary:hover{
  background:var(--primary-light);
  color:var(--primary-dark);
}
.btn:focus-visible,
.nav-link:focus-visible,
.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible,
.faq-question:focus-visible{
  outline:2px solid var(--primary);
  outline-offset:2px;
}
/* ===== Page Hero ===== */
.page-hero{
  background:var(--bg-hero);
  position:relative;
  overflow:hidden;
}
.hero-bg{
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-2.jpg');
  background-size:cover;
  background-position:center;
  opacity:0.30;
}
.hero-bg::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,rgba(22,32,46,0.95) 0%,rgba(22,32,46,0.82) 50%,rgba(22,32,46,0.60) 100%);
}
.page-hero-inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.1fr 0.9fr;
  gap:56px;
  padding-top:64px;
  padding-bottom:60px;
  align-items:center;
}
.page-hero-content{color:#fff}
.breadcrumb{
  font-size:13px;
  color:#AFC2D9;
  margin-bottom:14px;
  display:flex;
  align-items:center;
  gap:6px;
}
.breadcrumb a{
  color:#AFC2D9;
  transition:color .2s;
}
.breadcrumb a:hover{color:#fff}
.breadcrumb .sep{color:#4B657F}
.breadcrumb .current{color:#CBD5E1}
.page-hero-content h1{
  font-size:30px;
  line-height:1.35;
  color:#fff;
  font-weight:700;
  margin-bottom:12px;
  letter-spacing:0.5px;
}
.hero-desc{
  font-size:15px;
  color:#C7D4E3;
  max-width:520px;
  margin-bottom:24px;
}
.hero-actions{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}
.hero-note{
  margin-top:20px;
  font-size:12px;
  color:#8097AD;
  display:flex;
  align-items:center;
  gap:8px;
}
.hero-note .dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--accent);
  display:inline-block;
}
/* Hero Rank Panel */
.rank-panel{
  background:var(--white);
  border-radius:var(--radius-lg);
  padding:22px 24px;
  box-shadow:0 10px 36px rgba(0,0,0,0.25);
}
.rank-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:6px;
}
.rank-title{
  font-size:16px;
  font-weight:700;
  color:var(--text-title);
}
.rank-badge{
  font-size:11px;
  background:var(--primary-light);
  color:var(--primary);
  padding:3px 10px;
  border-radius:999px;
}
.rank-sub{
  font-size:12px;
  color:var(--text-muted);
  margin-bottom:14px;
}
.rank-list{
  list-style:none;
  counter-reset:rank;
}
.rank-item{
  counter-increment:rank;
  display:flex;
  align-items:center;
  gap:12px;
  padding:9px 10px;
  border-radius:8px;
  transition:background .2s;
}
.rank-item:hover{background:var(--bg-panel)}
.rank-item::before{
  content:counter(rank);
  font-size:15px;
  font-weight:700;
  color:var(--text-muted);
  width:22px;
  text-align:center;
  flex-shrink:0;
}
.rank-item:nth-child(-n+3)::before{
  color:var(--primary);
}
.rank-item .rank-name{
  flex:1;
  font-size:14px;
  color:var(--text-title);
  font-weight:500;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.rank-item .rank-score{
  font-size:13px;
  color:var(--accent);
  font-weight:600;
  flex-shrink:0;
}
/* ===== Section Common ===== */
.section-head{
  text-align:center;
  max-width:640px;
  margin:0 auto 48px;
}
.section-tag{
  display:inline-block;
  font-size:12px;
  color:var(--primary);
  background:var(--primary-light);
  padding:4px 14px;
  border-radius:999px;
  margin-bottom:12px;
  font-weight:600;
}
.section-head h2{
  font-size:22px;
  font-weight:700;
  color:var(--text-title);
  margin-bottom:8px;
}
.section-head p{
  font-size:14px;
  color:var(--text-body);
}
.library-section{
  padding:var(--space-section) 0;
}
/* ===== Filter Bar ===== */
.filter-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-bottom:28px;
  background:var(--white);
  border-radius:var(--radius-md);
  padding:14px 18px;
  box-shadow:var(--shadow-card);
  flex-wrap:wrap;
}
.filter-tags{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
}
.tag{
  font-size:13px;
  padding:6px 16px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--white);
  color:var(--text-body);
  transition:all .2s ease;
}
.tag:hover{
  border-color:var(--primary);
  color:var(--primary);
  background:var(--primary-light);
}
.tag.active{
  background:var(--primary);
  border-color:var(--primary);
  color:#fff;
  font-weight:600;
}
.sort-select{
  font-size:13px;
  padding:7px 14px;
  border:1px solid var(--border);
  border-radius:8px;
  color:var(--text-body);
  background:var(--bg-panel);
  appearance:auto;
  cursor:pointer;
  transition:border-color .2s;
}
.sort-select:focus{
  outline:2px solid var(--primary);
  outline-offset:2px;
  border-color:var(--primary);
}
/* ===== Video List ===== */
.video-list{
  display:flex;
  flex-direction:column;
  gap:24px;
  margin-bottom:36px;
}
.video-card{
  display:grid;
  grid-template-columns:280px 1fr;
  background:var(--white);
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow-card);
  transition:box-shadow .3s ease,transform .3s ease;
  border:1px solid var(--border);
}
.video-card:hover{
  box-shadow:var(--shadow-hover);
  transform:translateY(-2px);
}
.video-cover{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  min-height:160px;
  background:var(--bg-panel);
}
.video-cover img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .4s ease;
}
.video-card:hover .video-cover img{
  transform:scale(1.04);
}
.video-cat{
  position:absolute;
  top:12px;
  left:12px;
  font-size:12px;
  background:rgba(30,42,58,0.85);
  color:#fff;
  padding:3px 12px;
  border-radius:999px;
  z-index:1;
  backdrop-filter:blur(4px);
}
.video-info{
  padding:22px 26px;
  display:flex;
  flex-direction:column;
  justify-content:center;
}
.video-title{
  font-size:18px;
  font-weight:600;
  color:var(--text-title);
  margin-bottom:8px;
  line-height:1.45;
}
.video-title a{color:var(--text-title)}
.video-title a:hover{color:var(--primary)}
.video-summary{
  font-size:14px;
  color:var(--text-body);
  line-height:1.7;
  margin-bottom:14px;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.video-meta{
  display:flex;
  align-items:center;
  gap:16px;
  font-size:12px;
  color:var(--text-muted);
  flex-wrap:wrap;
}
.video-meta span{display:inline-flex;align-items:center;gap:4px}
.video-actions{
  margin-top:14px;
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}
.btn-sm{
  padding:6px 18px;
  font-size:13px;
  border-radius:8px;
}
.btn-view{
  background:var(--primary);
  color:#fff;
  border:none;
  transition:all .2s;
}
.btn-view:hover{
  background:var(--primary-dark);
  transform:translateY(-1px);
}
.btn-like{
  background:var(--white);
  color:var(--text-body);
  border:1px solid var(--border);
  transition:all .2s;
}
.btn-like:hover{
  border-color:var(--primary);
  color:var(--primary);
  background:var(--primary-light);
}
/* ===== Pagination ===== */
.pagination{
  display:flex;
  justify-content:center;
  gap:8px;
  flex-wrap:wrap;
}
.page-link{
  min-width:40px;
  height:40px;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:0 8px;
  border-radius:10px;
  font-size:14px;
  border:1px solid var(--border);
  background:var(--white);
  color:var(--text-body);
  transition:all .2s ease;
}
.page-link:hover{
  background:var(--primary-light);
  border-color:var(--primary);
  color:var(--primary);
}
.page-link.active{
  background:var(--primary);
  border-color:var(--primary);
  color:#fff;
  font-weight:600;
}
.page-link.next{
  padding:0 16px;
}
/* ===== Feature Section ===== */
.feature-section{
  background:var(--bg-panel);
  padding:var(--space-section) 0;
}
.feature-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.feature-card{
  background:var(--white);
  border-radius:var(--radius-lg);
  padding:28px 26px;
  box-shadow:var(--shadow-card);
  transition:box-shadow .3s,transform .3s;
  border-top:3px solid var(--primary);
}
.feature-card:hover{
  box-shadow:var(--shadow-hover);
  transform:translateY(-2px);
}
.feature-icon{
  width:48px;
  height:48px;
  background:var(--primary-light);
  color:var(--primary);
  border-radius:12px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:21px;
  margin-bottom:18px;
}
.feature-card h3{
  font-size:17px;
  font-weight:600;
  color:var(--text-title);
  margin-bottom:8px;
}
.feature-card p{
  font-size:14px;
  color:var(--text-body);
  line-height:1.7;
}
/* ===== FAQ ===== */
.faq-section{
  padding:var(--space-section) 0;
}
.faq-list{
  max-width:800px;
  margin:0 auto;
}
.faq-item{
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  margin-bottom:12px;
  overflow:hidden;
  transition:box-shadow .2s;
}
.faq-item:hover{
  box-shadow:var(--shadow-card);
}
.faq-question{
  width:100%;
  background:none;
  border:none;
  padding:18px 20px;
  font-size:15px;
  font-weight:600;
  color:var(--text-title);
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  text-align:left;
  cursor:pointer;
  transition:color .2s;
}
.faq-question:hover{color:var(--primary)}
.faq-icon{
  width:24px;
  height:24px;
  border-radius:50%;
  background:var(--bg-panel);
  color:var(--text-body);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:16px;
  flex-shrink:0;
  transition:all .3s ease;
  line-height:1;
}
.faq-item.open .faq-icon{
  background:var(--primary);
  color:#fff;
  transform:rotate(45deg);
}
.faq-answer{
  max-height:0;
  overflow:hidden;
  transition:max-height .3s ease;
}
.faq-answer-inner{
  padding:0 20px 18px;
  font-size:14px;
  color:var(--text-body);
  line-height:1.75;
  border-top:1px solid var(--border);
  padding-top:14px;
}
/* ===== CTA Bar ===== */
.cta-section{
  padding-bottom:var(--space-section);
}
.cta-bar{
  background:var(--primary-light);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  padding:28px 36px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
}
.cta-bar p{
  font-size:16px;
  font-weight:600;
  color:var(--text-title);
  max-width:600px;
}
.cta-bar .btn{
  flex-shrink:0;
}
/* ===== Footer ===== */
.site-footer{
  background:var(--bg-header);
  color:#AFC2D9;
  padding:56px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:36px;
  padding-bottom:40px;
}
.footer-brand .logo{
  margin-bottom:14px;
}
.footer-brand p{
  font-size:13px;
  line-height:1.75;
  color:#7E93AC;
  margin-top:8px;
}
.footer-title{
  font-size:15px;
  font-weight:600;
  color:#fff;
  margin-bottom:16px;
}
.footer-links,
.footer-contact{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:9px;
}
.footer-links a{
  color:#AFC2D9;
  font-size:13px;
  transition:color .2s;
}
.footer-links a:hover{color:var(--primary-light)}
.footer-contact li{
  font-size:13px;
  color:#7E93AC;
  line-height:1.6;
}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.08);
  padding:20px 0;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
  font-size:12px;
  color:#60788F;
}
/* ===== Responsive ===== */
@media (max-width:1024px){
  .page-hero-inner{
    grid-template-columns:1fr;
    gap:36px;
  }
  .feature-grid{
    grid-template-columns:repeat(2,1fr);
  }
  .footer-grid{
    grid-template-columns:repeat(2,1fr);
  }
  .video-card{
    grid-template-columns:220px 1fr;
  }
}
@media (max-width:768px){
  .container{padding:0 16px}
  :root{--space-section:56px}
  .header-inner{
    height:60px;
    gap:16px;
  }
  .main-nav{
    position:fixed;
    top:60px;
    left:0;
    right:0;
    background:var(--bg-header);
    flex-direction:column;
    padding:12px 16px 18px;
    gap:4px;
    box-shadow:0 8px 20px rgba(0,0,0,0.15);
    display:none;
    z-index:99;
    border-top:1px solid rgba(255,255,255,0.06);
  }
  .main-nav.open{display:flex}
  .nav-link{
    padding:12px 16px;
    font-size:15px;
  }
  .nav-toggle{display:flex}
  .page-hero-inner{
    padding-top:44px;
    padding-bottom:44px;
  }
  .page-hero-content h1{
    font-size:24px;
  }
  .hero-desc{
    font-size:14px;
  }
  .filter-bar{
    flex-direction:column;
    align-items:stretch;
  }
  .filter-tags{
    justify-content:flex-start;
  }
  .sort-select{
    width:100%;
  }
  .video-card{
    grid-template-columns:1fr;
  }
  .video-cover{
    aspect-ratio:16/9;
    min-height:auto;
  }
  .video-info{
    padding:18px;
  }
  .video-title{
    font-size:16px;
  }
  .feature-grid{
    grid-template-columns:1fr;
  }
  .footer-grid{
    grid-template-columns:1fr;
    gap:28px;
  }
  .cta-bar{
    padding:22px 20px;
    flex-direction:column;
    text-align:center;
  }
  .cta-bar .btn{
    width:100%;
  }
  .footer-bottom{
    flex-direction:column;
    text-align:center;
  }
  .pagination{
    gap:6px;
  }
  .page-link{
    min-width:36px;
    height:36px;
    font-size:13px;
  }
}
@media (max-width:520px){
  .video-actions{
    flex-direction:column;
  }
  .video-actions .btn{
    width:100%;
  }
  .hero-actions{
    flex-direction:column;
  }
  .hero-actions .btn{
    width:100%;
  }
  .rank-panel{
    padding:16px;
  }
  .rank-item .rank-name{
    font-size:13px;
  }
}