/* roulang page: index */
:root{
  --brand:#2563EB;
  --brand-l:#60A5FA;
  --brand-bg:#EEF4FF;
  --bg:#F7F9FC;
  --white:#FFFFFF;
  --dark:#0F172A;
  --text:#1E293B;
  --text-2:#64748B;
  --text-3:#94A3B8;
  --border:#E4E9F0;
  --success:#10B981;
  --warning:#F59E0B;
  --r-lg:16px;
  --r-md:12px;
  --r-sm:8px;
  --r-pill:999px;
  --shadow:0 1px 3px rgba(30,41,59,.06), 0 4px 12px rgba(30,41,59,.04);
  --shadow-lg:0 4px 10px rgba(30,41,59,.06), 0 12px 24px rgba(30,41,59,.08);
  --t:.25s ease;
}

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

html{
  scroll-behavior:smooth;
}

body{
  font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}

a{
  color:var(--brand);
  text-decoration:none;
  transition:color var(--t);
}

a:hover{
  color:#1D4ED8;
}

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

button, input, textarea{
  font-family:inherit;
  font-size:inherit;
  color:inherit;
}

.container{
  width:min(1200px, 92%);
  margin-inline:auto;
}

.grid-container{
  width:100%;
  max-width:1200px;
  margin-left:auto;
  margin-right:auto;
  padding-left:20px;
  padding-right:20px;
}

@media screen and (min-width:1024px){
  .grid-container{
    padding-left:24px;
    padding-right:24px;
  }
}

.grid-x{
  display:flex;
  flex-flow:row wrap;
}

.grid-x > .cell{
  width:auto;
  padding-left:12px;
  padding-right:12px;
}

.grid-margin-x{
  margin-left:-12px;
  margin-right:-12px;
}

.cell.small-12{
  width:100%;
  flex:0 0 100%;
  max-width:100%;
}

@media screen and (min-width:640px){
  .cell.medium-6{
    flex:0 0 50%;
    max-width:50%;
  }
}

@media screen and (min-width:1024px){
  .cell.large-3{
    flex:0 0 25%;
    max-width:25%;
  }
  .cell.large-4{
    flex:0 0 33.3333%;
    max-width:33.3333%;
  }
  .cell.large-5{
    flex:0 0 41.6667%;
    max-width:41.6667%;
  }
  .cell.large-6{
    flex:0 0 50%;
    max-width:50%;
  }
  .cell.large-7{
    flex:0 0 58.3333%;
    max-width:58.3333%;
  }
}

section{
  scroll-margin-top:90px;
}

.section-pad{
  padding:80px 0;
}

@media screen and (max-width:640px){
  .section-pad{
    padding:56px 0;
  }
}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 24px;
  border-radius:var(--r-sm);
  font-weight:600;
  font-size:15px;
  line-height:1;
  border:1px solid transparent;
  cursor:pointer;
  transition:background var(--t), box-shadow var(--t), border-color var(--t), transform var(--t);
  outline:none;
}

.btn:focus-visible{
  box-shadow:0 0 0 3px rgba(37,99,235,.25);
}

.btn-primary{
  background:var(--brand);
  color:#fff;
}

.btn-primary:hover{
  background:#1D4ED8;
  color:#fff;
  transform:translateY(-2px);
  box-shadow:0 8px 18px rgba(37,99,235,.2);
}

.btn-primary:active{
  transform:translateY(0);
  background:#1E40AF;
}

.btn-secondary{
  background:var(--white);
  color:var(--text);
  border-color:#CBD5E1;
}

.btn-secondary:hover{
  border-color:var(--brand);
  color:var(--brand);
  transform:translateY(-2px);
}

.btn-pill{
  min-height:48px;
  padding:0 32px;
  border-radius:var(--r-pill);
}

.btn-block{
  width:100%;
}

.text-link{
  color:var(--brand);
  font-weight:600;
  display:inline-flex;
  align-items:center;
  gap:6px;
}

.text-link i{
  transition:transform var(--t);
}

.text-link:hover i{
  transform:translateX(4px);
}

/* 标签 / 徽章 */
.badge{
  display:inline-flex;
  align-items:center;
  gap:5px;
  background:rgba(37,99,235,.1);
  color:var(--brand);
  font-size:13px;
  font-weight:600;
  padding:4px 12px;
  border-radius:var(--r-pill);
  white-space:nowrap;
}

.badge-warning{
  background:rgba(245,158,11,.12);
  color:#D97706;
}

/* 头部导航 */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(255,255,255,.96);
  backdrop-filter:saturate(1.2);
  border-bottom:1px solid var(--border);
}

.header-inner{
  max-width:1280px;
  margin:0 auto;
  display:flex;
  align-items:center;
  min-height:72px;
  padding:0 24px;
  gap:20px;
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  flex-shrink:0;
  color:var(--text);
  font-weight:700;
  font-size:20px;
}

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

.brand-mark{
  width:40px;
  height:40px;
  border-radius:12px;
  background:linear-gradient(135deg, var(--brand), var(--brand-l));
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  font-size:18px;
  font-weight:700;
  letter-spacing:-.5px;
  box-shadow:0 4px 10px rgba(37,99,235,.18);
}

.site-nav{
  flex:1;
  display:flex;
  align-items:center;
  justify-content:flex-end;
}

.nav-menu{
  list-style:none;
  display:flex;
  align-items:center;
  gap:0px;
}

.nav-menu > li > a{
  display:block;
  padding:8px 15px;
  color:var(--text-2);
  font-size:15px;
  font-weight:500;
  border-radius:6px;
  transition:all var(--t);
  position:relative;
}

.nav-menu > li > a:hover{
  background:var(--brand-bg);
  color:var(--brand);
}

.nav-menu > li > a.active{
  color:var(--brand);
  font-weight:600;
}

.nav-menu > li > a.active::after{
  content:"";
  position:absolute;
  left:15px;
  right:15px;
  bottom:-2px;
  height:2px;
  background:var(--brand);
  border-radius:2px;
}

.header-cta{
  flex-shrink:0;
}

.nav-toggle{
  display:none;
}

.nav-toggle-label{
  display:none;
  width:44px;
  height:44px;
  align-items:center;
  justify-content:center;
  border-radius:10px;
  cursor:pointer;
  color:var(--text);
  font-size:20px;
  transition:background var(--t);
}

.nav-toggle-label:hover{
  background:var(--brand-bg);
  color:var(--brand);
}

@media screen and (max-width:1023px){
  .header-inner{
    flex-wrap:wrap;
    gap:12px;
    padding:0 16px;
    min-height:64px;
  }

  .site-nav{
    order:3;
    flex:1 1 100%;
    max-height:0;
    overflow:hidden;
    transition:max-height .3s ease;
  }

  .nav-menu{
    flex-direction:column;
    align-items:flex-start;
    padding:8px 0 12px;
    gap:2px;
  }

  .nav-menu > li{
    width:100%;
  }

  .nav-menu > li > a{
    display:flex;
    align-items:center;
    min-height:48px;
    padding:0 16px;
    border-radius:10px;
    width:100%;
  }

  .nav-menu > li > a.active::after{
    display:none;
  }

  .nav-toggle-label{
    display:flex;
    margin-left:auto;
    order:2;
  }

  .header-cta{
    margin-left:auto;
    order:1;
    min-height:40px;
    padding:0 16px;
    font-size:14px;
  }

  .header-cta + .nav-toggle-label{
    margin-left:8px;
  }

  #nav-toggle:checked ~ .site-nav{
    max-height:480px;
    border-top:1px solid var(--border);
  }

  #nav-toggle:checked ~ .nav-toggle-label{
    background:var(--brand-bg);
    color:var(--brand);
  }
}

@media screen and (max-width:520px){
  .brand{
    font-size:18px;
  }

  .brand-mark{
    width:36px;
    height:36px;
    font-size:16px;
  }

  .header-cta{
    min-width:40px;
    width:40px;
    padding:0;
    justify-content:center;
    font-size:0;
    gap:0;
    border-radius:10px;
  }

  .header-cta::before{
    content:"参与";
    font-size:14px;
    font-weight:600;
  }
}

/* Hero */
.hero{
  background:linear-gradient(135deg, #EEF4FF 0%, #FFFFFF 70%);
  position:relative;
  overflow:hidden;
}

.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:url('/assets/images/backpic/back-1.webp') no-repeat center/cover;
  opacity:.3;
  mix-blend-mode:luminosity;
  z-index:0;
}

.hero::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(135deg, rgba(238,244,255,.88) 0%, rgba(255,255,255,.55) 100%);
  z-index:1;
}

.hero-inner{
  position:relative;
  z-index:2;
  padding:80px 0 90px;
}

@media screen and (max-width:1023px){
  .hero-inner{
    padding:56px 0 64px;
  }
}

.hero-title{
  font-size:clamp(28px, 4vw, 44px);
  line-height:1.25;
  font-weight:700;
  color:var(--text);
  letter-spacing:-.01em;
  margin-bottom:22px;
}

.hero-title span{
  color:var(--brand);
}

.hero-sub{
  font-size:17px;
  color:var(--text-2);
  line-height:1.8;
  max-width:600px;
  margin-bottom:32px;
}

.hero-actions{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:16px;
  margin-bottom:36px;
}

.hero-trust{
  display:flex;
  flex-wrap:wrap;
  gap:20px 28px;
  color:var(--text-2);
  font-size:14px;
}

.hero-trust span{
  display:inline-flex;
  align-items:center;
  gap:8px;
}

.hero-trust i{
  color:var(--success);
}

.hero-visual{
  border-radius:var(--r-lg);
  overflow:hidden;
  box-shadow:var(--shadow-lg);
  background:var(--white);
  border:1px solid var(--border);
  position:relative;
}

.hero-visual img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
}

.hero-visual-card{
  background:var(--white);
  border-radius:var(--r-lg);
  box-shadow:0 12px 36px rgba(30,41,59,.12);
  border:1px solid var(--border);
}

.hero-visual .visual-info{
  position:absolute;
  left:16px;
  right:16px;
  bottom:16px;
  background:rgba(255,255,255,.9);
  backdrop-filter:blur(6px);
  border-radius:12px;
  border:1px solid rgba(228,233,240,.9);
  padding:16px;
}

.visual-info-title{
  font-weight:700;
  font-size:15px;
  display:flex;
  align-items:center;
  gap:8px;
}

.visual-info-desc{
  font-size:13px;
  color:var(--text-2);
  margin-top:2px;
}

.hero-metrics{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  background:var(--white);
  border:1px solid var(--border);
  box-shadow:var(--shadow);
  border-radius:var(--r-md);
  overflow:hidden;
  margin-top:60px;
}

.metric-item{
  padding:20px 28px;
  border-right:1px solid var(--border);
}

.metric-item:last-child{
  border-right:none;
}

.metric-num{
  font-size:26px;
  font-weight:700;
  color:var(--brand);
  line-height:1.2;
  letter-spacing:-.01em;
}

.metric-label{
  font-size:13px;
  color:var(--text-2);
  margin-top:2px;
}

@media screen and (max-width:1023px){
  .hero-metrics{
    grid-template-columns:repeat(2,1fr);
  }

  .metric-item:nth-child(2){
    border-right:none;
  }

  .metric-item:nth-child(-n+2){
    border-bottom:1px solid var(--border);
  }
}

@media screen and (max-width:520px){
  .hero-metrics{
    grid-template-columns:1fr 1fr;
  }

  .metric-item{
    padding:16px 16px;
  }

  .metric-num{
    font-size:22px;
  }
}

/* trust strip */
.trust-strip{
  background:var(--white);
  border-bottom:1px solid var(--border);
  padding:18px 0;
}

.trust-inner{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:14px 28px;
}

.trust-item{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:14px;
  color:var(--text-2);
  font-weight:500;
}

.trust-item i{
  color:var(--brand);
  font-size:17px;
}

/* section heading */
.section-head{
  margin-bottom:48px;
}

.section-kicker{
  color:var(--brand);
  font-size:14px;
  font-weight:600;
  letter-spacing:.08em;
  text-transform:uppercase;
  margin-bottom:10px;
}

.section-title{
  font-size:clamp(22px, 2.6vw, 32px);
  line-height:1.35;
  font-weight:700;
  color:var(--text);
  padding-left:14px;
  position:relative;
}

.section-title::before{
  content:"";
  width:4px;
  height:60%;
  background:var(--brand);
  border-radius:4px;
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
}

.section-lead{
  color:var(--text-2);
  max-width:680px;
  margin-top:16px;
  font-size:16px;
}

/* service core */
.service-core{
  background:var(--bg);
}

.service-grid{
  display:grid;
  grid-template-columns:1fr 1.4fr;
  gap:48px;
  align-items:flex-start;
}

.service-sticky{
  position:sticky;
  top:110px;
}

.service-item{
  display:grid;
  grid-template-columns:1fr 1.2fr;
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  overflow:hidden;
  box-shadow:var(--shadow);
  transition:transform var(--t), box-shadow var(--t);
  margin-bottom:28px;
}

.service-item:last-child{
  margin-bottom:0;
}

.service-item:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-lg);
}

.service-item:nth-child(even){
  grid-template-columns:1.2fr 1fr;
  direction:rtl;
}

.service-item:nth-child(even) > *{
  direction:ltr;
}

.service-media img{
  width:100%;
  height:100%;
  object-fit:cover;
  aspect-ratio:1.2/1;
}

.service-body{
  padding:32px 28px;
}

.service-body h3{
  font-size:20px;
  font-weight:700;
  margin-bottom:10px;
}

.service-body p{
  color:var(--text-2);
  font-size:15px;
  line-height:1.75;
  margin-bottom:18px;
}

@media screen and (max-width:1023px){
  .service-grid{
    grid-template-columns:1fr;
  }

  .service-sticky{
    position:static;
  }

  .service-item,
  .service-item:nth-child(even){
    grid-template-columns:1fr;
    direction:ltr;
  }

  .service-item:nth-child(even) > *{
    direction:ltr;
  }

  .service-media img{
    aspect-ratio:16/10;
  }
}

@media screen and (max-width:640px){
  .service-body{
    padding:24px 20px;
  }
}

/* rewards */
.rewards{
  background:var(--white);
}

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

.reward-card{
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:28px 24px;
  transition:transform var(--t), box-shadow var(--t), background var(--t);
}

.reward-card:hover{
  transform:translateY(-4px);
  background:var(--white);
  box-shadow:var(--shadow-lg);
}

.reward-card:nth-child(2){
  transform:translateY(10px);
}

.reward-card:nth-child(2):hover{
  transform:translateY(6px);
}

.reward-icon{
  width:48px;
  height:48px;
  border-radius:14px;
  background:var(--brand-bg);
  color:var(--brand);
  font-size:20px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:16px;
}

.reward-card h3{
  font-size:18px;
  font-weight:700;
  margin-bottom:8px;
}

.reward-card p{
  font-size:14px;
  color:var(--text-2);
  margin-bottom:18px;
  line-height:1.7;
}

.reward-badge{
  position:absolute;
  top:16px;
  right:16px;
}

@media screen and (max-width:1023px){
  .rewards-grid{
    grid-template-columns:repeat(2, 1fr);
  }

  .reward-card:nth-child(2){
    transform:none;
  }

  .reward-card:nth-child(2):hover{
    transform:translateY(-4px);
  }
}

@media screen and (max-width:640px){
  .rewards-grid{
    grid-template-columns:1fr;
  }
}

/* steps */
.steps-section{
  background:linear-gradient(180deg, #FFFFFF 0%, #EEF4FF 100%);
}

.steps-grid{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:28px;
  margin-top:56px;
}

.step-item{
  position:relative;
}

.step-item::before{
  content:"";
  position:absolute;
  top:26px;
  left:calc(14% + 34px);
  right:calc(-100% + 100px);
  height:2px;
  border-top:2px dashed #CBD5E1;
}

.step-item:last-child::before{
  display:none;
}

.step-node{
  width:56px;
  height:56px;
  border-radius:50%;
  background:var(--white);
  border:2px solid var(--brand);
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  font-size:18px;
  color:var(--brand);
  position:relative;
  z-index:2;
  box-shadow:0 0 0 6px rgba(255,255,255,.7);
}

.step-item.done .step-node{
  background:var(--brand);
  color:#fff;
}

.step-item.done::before{
  border-color:var(--brand);
}

.step-item.offset-card{
  margin-top:16px;
}

.step-card{
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--r-md);
  padding:22px;
  margin-top:18px;
  box-shadow:var(--shadow);
  transition:transform var(--t), box-shadow var(--t);
}

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

.step-card h3{
  font-size:17px;
  font-weight:700;
  margin-bottom:8px;
}

.step-card p{
  font-size:14px;
  color:var(--text-2);
  line-height:1.65;
}

@media screen and (max-width:1023px){
  .steps-grid{
    grid-template-columns:1fr 1fr;
    gap:24px;
  }

  .step-item::before{
    display:none;
  }
}

@media screen and (max-width:640px){
  .steps-grid{
    grid-template-columns:1fr;
  }

  .step-item.offset-card{
    margin-top:0;
  }
}

/* compact stats */
.stats-mini{
  margin-top:56px;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:16px;
}

.stat-mini{
  background:rgba(255,255,255,.72);
  border:1px solid var(--border);
  backdrop-filter:blur(6px);
  border-radius:var(--r-md);
  padding:20px;
  text-align:center;
}

.stat-mini strong{
  display:block;
  font-size:22px;
  color:var(--brand);
}

.stat-mini span{
  font-size:13px;
  color:var(--text-2);
}

@media screen and (max-width:640px){
  .stats-mini{
    grid-template-columns:repeat(2,1fr);
  }
}

/* news section */
.news-section{
  background:var(--white);
}

.news-feature-card{
  display:flex;
  flex-direction:column;
  border-radius:var(--r-lg);
  overflow:hidden;
  background:var(--white);
  border:1px solid var(--border);
  box-shadow:var(--shadow);
  transition:transform var(--t), box-shadow var(--t);
  height:100%;
}

.news-feature-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-lg);
}

.news-feature-card .news-media{
  overflow:hidden;
  aspect-ratio:16/9;
}

.news-feature-card .news-media img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .4s ease;
}

.news-feature-card:hover .news-media img{
  transform:scale(1.03);
}

.news-feature-body{
  padding:28px;
  display:flex;
  flex-direction:column;
  flex:1;
}

.news-feature-body .badge{
  align-self:flex-start;
  margin-bottom:14px;
}

.news-feature-title{
  font-size:20px;
  font-weight:700;
  line-height:1.5;
  margin-bottom:10px;
}

.news-feature-title a{
  color:var(--text);
}

.news-feature-title a:hover{
  color:var(--brand);
}

.news-feature-summary{
  color:var(--text-2);
  font-size:15px;
  margin-bottom:20px;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}

.news-meta{
  margin-top:auto;
  display:flex;
  align-items:center;
  gap:14px;
  font-size:13px;
  color:var(--text-3);
}

.news-meta .badge{
  background:#F1F5F9;
  color:var(--text-2);
  font-size:12px;
  padding:3px 10px;
}

.news-list{
  display:flex;
  flex-direction:column;
  gap:0px;
}

.news-list-item{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 4px;
  border-bottom:1px solid var(--border);
  transition:background var(--t);
}

.news-list-item:first-child{
  padding-top:0;
}

.news-list-item:hover{
  background:#FAFCFF;
}

.news-list-main{
  min-width:0;
}

.news-list-title{
  font-size:16px;
  font-weight:600;
  color:var(--text);
  margin-bottom:4px;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  transition:color var(--t);
}

.news-list-item:hover .news-list-title{
  color:var(--brand);
}

.news-list-desc{
  color:var(--text-3);
  font-size:13px;
  display:-webkit-box;
  -webkit-line-clamp:1;
  -webkit-box-orient:vertical;
  overflow:hidden;
}

.news-list-side{
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  gap:8px;
  flex-shrink:0;
}

.news-list-side .badge{
  font-size:12px;
}

.news-list-side time{
  font-size:12px;
  color:var(--text-3);
}

.news-empty{
  border:1px dashed var(--border);
  background:#F8FAFC;
  border-radius:var(--r-lg);
  padding:72px 20px;
  text-align:center;
  color:var(--text-2);
}

.news-empty .empty-icon{
  width:64px;
  height:64px;
  border-radius:20px;
  background:var(--brand-bg);
  color:var(--brand);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:26px;
  margin:0 auto 18px;
}

.news-empty h3{
  font-size:18px;
  font-weight:600;
  margin-bottom:6px;
}

.news-empty p{
  font-size:14px;
  color:var(--text-3);
}

/* FAQ */
.faq-section{
  background:var(--bg);
}

.faq-grid{
  display:grid;
  grid-template-columns:1fr 1.6fr;
  gap:48px;
}

.faq-side .text-link{
  margin-top:20px;
}

.accordion{
  list-style:none;
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  box-shadow:var(--shadow);
  overflow:hidden;
}

.accordion-item{
  border-bottom:1px solid var(--border);
}

.accordion-item:last-child{
  border-bottom:none;
}

.accordion-title{
  display:block;
  padding:20px 56px 20px 24px;
  font-size:16px;
  font-weight:600;
  color:var(--text);
  position:relative;
  cursor:pointer;
  transition:background var(--t), color var(--t);
}

.accordion-title:hover{
  background:#F8FAFC;
  color:var(--brand);
}

.accordion-title::after{
  content:"\f078";
  font-family:"Font Awesome 6 Free";
  font-weight:900;
  position:absolute;
  right:22px;
  top:50%;
  transform:translateY(-50%);
  color:var(--text-3);
  font-size:13px;
  transition:transform .3s ease;
}

.accordion-item.is-active > .accordion-title{
  background:#F8FAFC;
  color:var(--brand);
}

.accordion-item.is-active > .accordion-title::after{
  transform:translateY(-50%) rotate(180deg);
  color:var(--brand);
}

.accordion-content{
  display:none;
  padding:0 24px 20px;
  font-size:15px;
  color:var(--text-2);
  line-height:1.8;
}

.accordion-item.is-active > .accordion-content{
  display:block;
}

/* CTA banner */
.cta-banner{
  background:linear-gradient(135deg, #EEF4FF 0%, #DBEAFE 100%);
  padding:72px 0;
}

.cta-box{
  background:linear-gradient(135deg, #2563EB 0%, #3B82F6 100%);
  border-radius:20px;
  padding:48px 40px;
  color:#fff;
  box-shadow:0 16px 40px rgba(37,99,235,.25);
  position:relative;
  overflow:hidden;
}

.cta-box::after{
  content:"";
  position:absolute;
  right:-80px;
  top:-80px;
  width:260px;
  height:260px;
  border-radius:50%;
  background:rgba(255,255,255,.08);
}

.cta-box::before{
  content:"";
  position:absolute;
  right:60px;
  bottom:-120px;
  width:200px;
  height:200px;
  border-radius:50%;
  background:rgba(255,255,255,.06);
}

.cta-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr;
  gap:36px;
  align-items:center;
  position:relative;
  z-index:2;
}

.cta-box h2{
  font-size:clamp(22px, 2.6vw, 30px);
  font-weight:700;
  margin-bottom:12px;
}

.cta-box p{
  color:rgba(255,255,255,.85);
  font-size:15px;
  line-height:1.7;
  margin-bottom:0;
}

.cta-form{
  background:rgba(255,255,255,.14);
  border:1px solid rgba(255,255,255,.2);
  backdrop-filter:blur(8px);
  border-radius:14px;
  padding:24px;
}

.cta-form label{
  font-size:14px;
  color:#fff;
  margin-bottom:10px;
  display:block;
}

.cta-form-row{
  display:flex;
  gap:12px;
}

.cta-form input[type="email"]{
  flex:1;
  min-width:0;
  height:46px;
  border:none;
  border-radius:8px;
  padding:0 14px;
  color:var(--text);
  background:var(--white);
  outline:none;
  font-size:14px;
}

.cta-form input[type="email"]:focus{
  box-shadow:0 0 0 3px rgba(255,255,255,.45);
}

.cta-form .btn{
  white-space:nowrap;
  background:var(--dark);
  border-color:var(--dark);
}

.cta-form .btn:hover{
  background:#1E293B;
  color:#fff;
}

@media screen and (max-width:1023px){
  .cta-grid{
    grid-template-columns:1fr;
  }

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

@media screen and (max-width:640px){
  .cta-box{
    padding:32px 20px;
  }

  .cta-form-row{
    flex-direction:column;
  }

  .cta-form input[type="email"]{
    width:100%;
  }
}

/* footer */
.site-footer{
  background:var(--dark);
  color:#94A3B8;
  padding:64px 0 24px;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.2fr;
  gap:40px;
  padding-bottom:44px;
  border-bottom:1px solid rgba(255,255,255,.08);
}

.footer-brand .brand{
  color:#fff;
  font-size:20px;
  margin-bottom:16px;
}

.footer-brand .brand-mark{
  background:linear-gradient(135deg, var(--brand), var(--brand-l));
}

.footer-brand p{
  font-size:14px;
  line-height:1.7;
  max-width:280px;
  margin-top:4px;
}

.footer-col h4{
  color:#fff;
  font-size:16px;
  font-weight:600;
  margin-bottom:18px;
}

.footer-col ul{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:10px;
}

.footer-col a{
  color:#94A3B8;
  font-size:14px;
  transition:color var(--t);
}

.footer-col a:hover{
  color:var(--brand-l);
}

.footer-contact a{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:12px;
}

.footer-bottom{
  padding-top:24px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
  gap:12px;
  font-size:13px;
}

@media screen and (max-width:1023px){
  .footer-grid{
    grid-template-columns:1fr 1fr;
  }
}

@media screen and (max-width:640px){
  .footer-grid{
    grid-template-columns:1fr;
    gap:28px;
  }

  .footer-bottom{
    flex-direction:column;
    align-items:flex-start;
  }
}

/* roulang page: article */
:root {
    --brand-blue: #2563EB;
    --brand-blue-hover: #1D4ED8;
    --aux-blue: #60A5FA;
    --soft-blue: #EEF4FF;
    --page-bg: #F7F9FC;
    --card-bg: #FFFFFF;
    --text-main: #1E293B;
    --text-muted: #64748B;
    --text-faint: #94A3B8;
    --border-light: #E4E9F0;
    --border-form: #CBD5E1;
    --success-green: #10B981;
    --warn-amber: #F59E0B;
    --radius-card: 16px;
    --radius-box: 12px;
    --radius-btn: 8px;
    --shadow-card: 0 1px 3px rgba(30, 41, 59, 0.06), 0 4px 12px rgba(30, 41, 59, 0.04);
    --shadow-hover: 0 4px 10px rgba(30, 41, 59, 0.06), 0 12px 24px rgba(30, 41, 59, 0.08);
    --font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-family);
    background: var(--page-bg);
    color: var(--text-main);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

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

a {
    color: var(--brand-blue);
    text-decoration: none;
    transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

a:hover {
    color: var(--brand-blue-hover);
}

:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.3);
    outline-offset: 2px;
}

ul,
ol {
    margin: 0;
    padding: 0;
}

.grid-container {
    max-width: 1200px;
    padding: 0 24px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--border-light);
    backdrop-filter: saturate(1.2) blur(10px);
    -webkit-backdrop-filter: saturate(1.2) blur(10px);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    height: 72px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 22px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
    white-space: nowrap;
    flex-shrink: 0;
}

.brand .brand-mark {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--brand-blue), var(--aux-blue));
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.2);
    flex-shrink: 0;
}

.site-header .brand:hover {
    color: var(--brand-blue);
}

.site-nav {
    margin-left: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}

.nav-menu a {
    display: inline-flex;
    align-items: center;
    padding: 10px 13px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-main);
    line-height: 1.2;
    position: relative;
}

.nav-menu a:hover {
    background: var(--soft-blue);
    color: var(--brand-blue);
}

.nav-menu a.active {
    color: var(--brand-blue);
    font-weight: 600;
}

.nav-menu a.active::after {
    content: "";
    position: absolute;
    left: 13px;
    right: 13px;
    bottom: 5px;
    height: 2px;
    border-radius: 2px;
    background: var(--brand-blue);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    border-radius: var(--radius-btn);
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition: all 0.25s ease;
    min-height: 44px;
    padding: 0 26px;
    vertical-align: middle;
    text-align: center;
}

.btn-primary {
    background: var(--brand-blue);
    color: #fff;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.18);
}

.btn-primary:hover {
    background: var(--brand-blue-hover);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 6px 12px rgba(37, 99, 235, 0.22);
}

.btn-primary:active {
    transform: translateY(1px);
    box-shadow: none;
}

.btn-secondary {
    background: #fff;
    border-color: var(--border-form);
    color: var(--text-main);
}

.btn-secondary:hover {
    border-color: var(--brand-blue);
    color: var(--brand-blue);
    background: #fff;
}

.header-cta {
    flex-shrink: 0;
    min-width: 108px;
    height: 42px;
    padding: 0 20px;
    margin-left: 18px;
}

.nav-toggle,
.nav-toggle-label {
    display: none;
}

/* ===== 面包屑 ===== */
.crumb-bar {
    background: #fff;
    border-bottom: 1px solid var(--border-light);
    padding: 16px 0;
}

.crumb-inner {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
}

.crumb-inner a {
    color: var(--text-muted);
}

.crumb-inner a:hover {
    color: var(--brand-blue);
}

.crumb-inner i {
    font-size: 12px;
    color: var(--text-faint);
}

.crumb-inner .crumb-current {
    color: var(--brand-blue);
    font-weight: 600;
    max-width: 420px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ===== 文章详情主体 ===== */
.article-page {
    padding: 56px 0 72px;
}

.article-layout {
    align-items: flex-start;
}

.article-main {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.article-head {
    padding: 38px 42px 0;
}

.article-meta-line {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px 18px;
    margin-bottom: 18px;
    font-size: 14px;
    color: var(--text-muted);
}

.article-meta-line i {
    margin-right: 5px;
    color: var(--aux-blue);
}

.article-tag {
    display: inline-flex;
    align-items: center;
    background: rgba(37, 99, 235, 0.08);
    color: var(--brand-blue);
    border-radius: 999px;
    padding: 5px 13px;
    font-size: 12px;
    font-weight: 600;
    line-height: 1.2;
}

.article-title {
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.3;
    color: var(--text-main);
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0 0 16px;
    word-break: break-word;
}

.article-cover {
    margin: 30px 42px 8px;
}

.article-cover img {
    width: 100%;
    aspect-ratio: 16 / 8;
    object-fit: cover;
    border-radius: var(--radius-box);
    background: #E2E8F0;
    border: 1px solid var(--border-light);
}

.article-content {
    padding: 28px 42px 40px;
    font-size: 16px;
    line-height: 1.9;
    color: var(--text-main);
}

.article-content p,
.article-content ul,
.article-content ol,
.article-content blockquote,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content table {
    max-width: 760px;
}

.article-content p {
    margin: 0 0 1.5em;
}

.article-content h2 {
    font-size: 26px;
    color: var(--text-main);
    font-weight: 700;
    margin: 1.6em 0 0.6em;
    padding-left: 14px;
    border-left: 4px solid var(--brand-blue);
    line-height: 1.4;
}

.article-content h3 {
    font-size: 21px;
    color: var(--text-main);
    font-weight: 700;
    margin: 1.5em 0 0.55em;
}

.article-content h4 {
    font-size: 18px;
    color: var(--text-main);
    font-weight: 600;
    margin: 1.4em 0 0.5em;
}

.article-content a {
    color: var(--brand-blue);
    border-bottom: 1px solid rgba(37, 99, 235, 0.3);
}

.article-content a:hover {
    border-bottom-color: var(--brand-blue-hover);
    color: var(--brand-blue-hover);
}

.article-content ul,
.article-content ol {
    margin: 0 0 1.5em;
    padding-left: 1.4em;
}

.article-content li {
    margin: 0.5em 0;
}

.article-content blockquote {
    margin: 0 0 1.5em;
    padding: 18px 24px;
    background: var(--soft-blue);
    border-left: 4px solid var(--brand-blue);
    border-radius: 0 var(--radius-box) var(--radius-box) 0;
    color: var(--text-muted);
}

.article-content img {
    border-radius: var(--radius-box);
    margin: 1.4em auto;
    max-height: 600px;
    object-fit: cover;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.4em 0;
    font-size: 15px;
    overflow: hidden;
    border-radius: var(--radius-box);
}

.article-content th {
    background: var(--soft-blue);
    color: var(--text-main);
    font-weight: 600;
    padding: 12px 14px;
    text-align: left;
}

.article-content td {
    border: 1px solid var(--border-light);
    padding: 10px 14px;
    vertical-align: top;
}

.article-content pre {
    background: #0F172A;
    color: #E2E8F0;
    padding: 20px;
    border-radius: var(--radius-box);
    overflow-x: auto;
    margin: 0 0 1.5em;
    line-height: 1.7;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--border-light);
    margin: 2em 0;
}

/* ===== 上一篇 / 下一篇导航位 ===== */
.post-pager {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    padding: 8px 42px 42px;
}

.pager-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-height: 84px;
    background: #F8FAFC;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-box);
    padding: 18px 20px;
    transition: all 0.25s ease;
}

.pager-card:hover {
    background: #fff;
    border-color: var(--aux-blue);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
    color: var(--text-main);
}

.pager-label {
    font-size: 13px;
    color: var(--text-faint);
}

.pager-card span + span {
    font-size: 15px;
    color: var(--text-main);
    font-weight: 600;
}

.pager-card:hover span + span {
    color: var(--brand-blue);
}

.pager-next {
    text-align: right;
    align-items: flex-end;
}

/* ===== 侧栏 ===== */
.article-side {
    display: flex;
    flex-direction: column;
    gap: 24px;
    align-self: start;
}

.side-card {
    background: #fff;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    padding: 24px;
}

.side-card h3 {
    margin: 0 0 18px;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
}

.side-card h3 i {
    color: var(--brand-blue);
    margin-right: 9px;
    font-size: 16px;
}

.side-nav {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.side-nav a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 13px 14px;
    border-radius: 10px;
    background: #F8FAFC;
    border: 1px solid transparent;
    color: var(--text-main);
    font-size: 15px;
    font-weight: 500;
    transition: all 0.22s ease;
}

.side-nav a:hover {
    background: var(--soft-blue);
    border-color: rgba(37, 99, 235, 0.22);
    color: var(--brand-blue);
    transform: translateX(2px);
}

.side-nav i {
    font-size: 13px;
    color: var(--text-faint);
    transition: transform 0.2s ease;
}

.side-nav a:hover i {
    color: var(--brand-blue);
    transform: translateX(2px);
}

.side-card p {
    color: var(--text-muted);
    font-size: 15px;
    margin: 0 0 16px;
}

.side-promo {
    background: linear-gradient(160deg, var(--soft-blue), #fff);
}

.side-promo .btn {
    width: 100%;
    margin-top: 4px;
}

.side-note {
    background: var(--soft-blue);
    border: 1px solid rgba(37, 99, 235, 0.15);
}

.side-note ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 14px;
    color: var(--text-muted);
}

.side-note li {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.side-note i {
    color: var(--success-green);
    margin-top: 4px;
    font-size: 14px;
}

/* ===== 延伸阅读 ===== */
.related-section {
    background: var(--soft-blue);
    padding: 72px 0;
    margin-top: 16px;
}

.section-heading {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 34px;
}

.section-heading-left {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.section-heading-left::before {
    content: "";
    width: 4px;
    height: 30px;
    background: var(--brand-blue);
    border-radius: 999px;
    margin-top: 4px;
}

.section-heading h2 {
    margin: 0;
    font-size: clamp(22px, 2.6vw, 30px);
    color: var(--text-main);
    line-height: 1.3;
}

.section-heading p {
    margin: 8px 0 0;
    color: var(--text-muted);
    font-size: 15px;
}

.section-more {
    font-weight: 600;
    font-size: 15px;
    color: var(--brand-blue);
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.section-more i {
    transition: transform 0.2s ease;
}

.section-more:hover i {
    transform: translateX(4px);
}

.related-grid {
    row-gap: 28px;
}

.related-card {
    height: 100%;
    background: #fff;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all 0.25s ease;
}

.related-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(37, 99, 235, 0.25);
}

.related-card:nth-child(even) .related-card-inner {
    transform: translateY(14px);
}

.related-card-thumb {
    aspect-ratio: 16 / 10;
    background: #E2E8F0;
    overflow: hidden;
}

.related-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.related-card:hover .related-card-thumb img {
    transform: scale(1.04);
}

.related-card-body {
    padding: 20px 22px 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.related-card-body h3 {
    margin: 0 0 8px;
    font-size: 18px;
    line-height: 1.5;
    color: var(--text-main);
}

.related-card-body h3 a {
    color: var(--text-main);
}

.related-card-body h3 a:hover {
    color: var(--brand-blue);
}

.related-card-body p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.7;
    margin: 0 0 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--brand-blue);
}

.related-link i {
    font-size: 12px;
    transition: transform 0.2s ease;
}

.related-link:hover i {
    transform: translateX(4px);
}

/* ===== 空内容状态 ===== */
.article-missing {
    padding: 96px 20px;
    min-height: 55vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.missing-card {
    max-width: 560px;
    width: 100%;
    text-align: center;
    background: #fff;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    padding: 56px 40px;
}

.missing-icon {
    width: 88px;
    height: 88px;
    border-radius: 24px;
    background: var(--soft-blue);
    color: var(--brand-blue);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    margin-bottom: 24px;
}

.missing-card h1 {
    margin: 0 0 12px;
    font-size: clamp(28px, 4vw, 38px);
    color: var(--text-main);
}

.missing-card p {
    color: var(--text-muted);
    font-size: 16px;
    margin: 0 0 28px;
}

.missing-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
}

/* ===== 通用页脚 ===== */
.site-footer {
    background: #0F172A;
    color: #CBD5E1;
    padding: 64px 0 24px;
    margin-top: 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 36px;
    margin-bottom: 42px;
}

.footer-brand .brand {
    color: #fff;
    margin-bottom: 18px;
}

.footer-brand .brand .brand-mark {
    background: linear-gradient(135deg, var(--brand-blue), var(--aux-blue));
}

.footer-brand p {
    font-size: 15px;
    line-height: 1.8;
    color: #94A3B8;
    max-width: 280px;
    margin: 18px 0 0;
}

.site-footer h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 18px;
}

.site-footer ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 11px;
}

.site-footer a {
    color: #CBD5E1;
    font-size: 15px;
    transition: color 0.2s ease;
}

.site-footer a:hover {
    color: var(--aux-blue);
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 11px;
}

.footer-contact a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.footer-contact i {
    width: 20px;
    color: var(--aux-blue);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 14px;
    color: #94A3B8;
}

/* ===== 响应式 ===== */
@media screen and (max-width: 1023px) {
    .header-inner {
        gap: 14px;
    }

    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        border-bottom: 1px solid var(--border-light);
        box-shadow: 0 16px 28px rgba(15, 23, 42, 0.1);
        margin-left: 0;
        padding: 14px 16px;
        z-index: 50;
    }

    .nav-toggle:checked ~ .site-nav {
        display: block;
    }

    .nav-menu {
        flex-direction: column;
        gap: 6px;
        align-items: stretch;
        margin: 0 0 12px;
    }

    .nav-menu a {
        min-height: 48px;
        font-size: 16px;
        padding: 0 16px;
        border-radius: 8px;
    }

    .nav-menu a.active::after {
        display: none;
    }

    .header-cta {
        margin-left: auto;
    }

    .nav-toggle-label {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 42px;
        height: 42px;
        border: 1px solid var(--border-light);
        border-radius: var(--radius-btn);
        background: #fff;
        cursor: pointer;
        color: var(--text-main);
        font-size: 18px;
        flex-shrink: 0;
    }

    .nav-toggle-label:hover {
        border-color: var(--brand-blue);
        color: var(--brand-blue);
    }

    .article-head {
        padding: 28px 26px 0;
    }

    .article-cover {
        margin: 24px 26px 6px;
    }

    .article-content {
        padding: 24px 26px 32px;
    }

    .article-content p,
    .article-content ul,
    .article-content ol,
    .article-content blockquote,
    .article-content h2,
    .article-content h3,
    .article-content h4 {
        max-width: 100%;
    }

    .post-pager {
        padding: 4px 26px 28px;
    }

    .article-side {
        margin-top: 32px;
    }

    .related-grid {
        row-gap: 40px;
    }

    .related-card:nth-child(even) .related-card-inner {
        transform: none;
    }

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

@media screen and (max-width: 767px) {
    .grid-container {
        padding: 0 18px;
    }

    .article-page {
        padding: 32px 0 52px;
    }

    .article-title {
        font-size: 30px;
    }

    .article-head {
        padding: 22px 18px 0;
    }

    .article-cover {
        margin: 18px 18px 4px;
    }

    .article-content {
        padding: 20px 18px 24px;
    }

    .article-content table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    .post-pager {
        grid-template-columns: 1fr;
        padding: 2px 18px 22px;
    }

    .pager-next {
        text-align: left;
        align-items: flex-start;
    }

    .crumb-inner .crumb-current {
        max-width: 260px;
    }

    .related-section {
        padding: 52px 0;
    }

    .related-card:nth-child(even) .related-card-inner {
        transform: none;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .site-footer {
        padding: 44px 0 20px;
    }
}

@media screen and (max-width: 520px) {
    .header-inner {
        height: 64px;
        padding: 0 14px;
        gap: 10px;
    }

    .brand {
        font-size: 17px;
        gap: 7px;
        min-width: 0;
    }

    .brand .brand-mark {
        width: 32px;
        height: 32px;
        font-size: 16px;
        border-radius: 8px;
    }

    .brand span:last-child {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 142px;
    }

    .header-cta {
        min-width: 0;
        padding: 0 14px;
        font-size: 14px;
        height: 38px;
    }

    .nav-toggle-label {
        width: 38px;
        height: 38px;
        font-size: 16px;
    }

    .crumb-bar {
        padding: 12px 0;
    }

    .crumb-inner {
        font-size: 13px;
    }

    .crumb-inner .crumb-current {
        max-width: 180px;
    }

    .article-missing {
        padding: 60px 16px;
    }

    .missing-card {
        padding: 36px 20px;
    }

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

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

/* roulang page: category1 */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #60A5FA;
  --primary-soft: #EEF4FF;
  --bg: #F7F9FC;
  --white: #ffffff;
  --text: #1E293B;
  --text-secondary: #64748B;
  --muted: #94A3B8;
  --border: #E4E9F0;
  --line: #CBD5E1;
  --success: #10B981;
  --radius-large: 18px;
  --radius-medium: 14px;
  --radius-small: 10px;
  --shadow-sm: 0 1px 3px rgba(30,41,59,0.06), 0 4px 12px rgba(30,41,59,0.04);
  --shadow-md: 0 4px 10px rgba(30,41,59,0.06), 0 12px 24px rgba(30,41,59,0.08);
  --transition: all 0.25s ease;
}

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

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

html {
  scroll-behavior: smooth;
}

img {
  max-width: 100%;
  display: block;
  border: 0;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

ul, ol, p, figure, h1, h2, h3, h4 {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}

h1, h2, h3, h4 {
  color: var(--text);
  font-family: inherit;
  line-height: 1.3;
}

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

.grid-container {
  max-width: 1200px;
  padding-right: 24px;
  padding-left: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 28px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 14px rgba(37, 99, 235, 0.18);
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.22);
  transform: translateY(-1px);
}

.btn-primary:active {
  background: var(--primary-dark);
  transform: translateY(1px);
  box-shadow: none;
}

.btn-secondary {
  background: var(--white);
  border-color: #CBD5E1;
  color: var(--text);
}

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

.btn-secondary:active {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(1px);
}

.block {
  width: 100%;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-weight: 600;
  font-size: 15px;
  transition: gap 0.2s ease, color 0.2s ease;
}

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

.text-link:focus-visible, .btn:focus-visible, a:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.2);
  outline-offset: 2px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(1.2);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1240px;
  min-height: 72px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 19px;
  font-weight: 700;
  white-space: nowrap;
}

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

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  font-weight: 800;
  font-size: 19px;
  box-shadow: 0 5px 12px rgba(37, 99, 235, 0.22);
}

.site-nav {
  margin-left: 30px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu a {
  padding: 9px 14px;
  border-radius: 8px;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-menu a:hover {
  background: var(--primary-soft);
  color: var(--primary);
}

.nav-menu a.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
}

.header-cta {
  height: 42px;
  padding: 0 20px;
  font-size: 14px;
  margin-left: auto;
}

.nav-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.nav-toggle-label {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--white);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-toggle-label:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ---------- Hero ---------- */
.page-hero {
  padding: 50px 0 76px;
  background:
    linear-gradient(135deg, rgba(238, 244, 255, 0.97) 0%, rgba(255, 255, 255, 0.88) 50%, rgba(219, 234, 254, 0.7) 100%),
    url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
  border-bottom: 1px solid var(--border);
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  margin-bottom: 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(37, 99, 235, 0.15);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.crumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--muted);
}

.crumb-list a {
  color: var(--text-secondary);
}

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

.hero-title {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.25;
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: -0.4px;
}

.hero-lead {
  max-width: 580px;
  color: var(--text-secondary);
  font-size: 17px;
  line-height: 1.85;
  margin-bottom: 30px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 26px;
}

.hero-feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  color: var(--text-secondary);
  font-size: 14px;
}

.hero-feature-tags span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero-feature-tags i {
  color: var(--primary);
  font-size: 15px;
}

.hero-figure {
  background: linear-gradient(145deg, #E2EEFF, #F4F8FF);
  border-radius: 20px;
  border: 1px solid rgba(37, 99, 235, 0.12);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.hero-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- Category detail ---------- */
.cat-detail {
  padding: 56px 0 28px;
}

.cat-anchor {
  position: sticky;
  top: 96px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-sm);
  padding: 24px 20px;
  margin-bottom: 28px;
}

.anchor-heading {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.anchor-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.anchor-sub {
  margin-top: 5px;
  font-size: 13px;
  color: var(--muted);
}

.anchor-list {
  margin: 18px 0 22px;
}

.anchor-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 15px;
  transition: all 0.2s ease;
}

.anchor-list a:hover {
  background: var(--primary-soft);
  color: var(--primary);
}

.anchor-list .anchor-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 7px;
  background: #F1F5F9;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.anchor-list a:hover .anchor-index {
  background: var(--primary);
  color: #fff;
}

.anchor-foot {
  padding: 18px 12px 0;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

.anchor-foot .text-link {
  margin-top: 8px;
  font-size: 14px;
}

.cat-panels {
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin-bottom: 36px;
}

.panel-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-sm);
  padding: clamp(22px, 4vw, 36px);
}

section[id] {
  scroll-margin-top: 100px;
}

.panel-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.panel-card h2 {
  position: relative;
  font-size: clamp(23px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1.4;
  padding-left: 14px;
  margin-bottom: 14px;
}

.panel-card h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  bottom: 7px;
  width: 4px;
  border-radius: 999px;
  background: var(--primary);
}

.panel-intro {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 22px;
}

/* ---------- Intro visual list ---------- */
.intro-layout {
  margin-top: 14px;
}

.visual-frame {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, #E2EEFF, #F4F8FF);
  box-shadow: var(--shadow-sm);
}

.visual-frame img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.check-list {
  display: grid;
  gap: 20px;
}

.check-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.check-list i {
  color: var(--primary);
  font-size: 20px;
  margin-top: 3px;
}

.check-list strong {
  display: block;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.check-list span {
  display: block;
  color: var(--text-secondary);
  line-height: 1.75;
  font-size: 15px;
}

/* ---------- Scope ---------- */
.scope-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 6px;
}

.scope-card {
  background: #F8FAFC;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  transition: all 0.25s ease;
}

.scope-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.scope-icon {
  width: 46px;
  height: 46px;
  border-radius: 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 20px;
  margin-bottom: 16px;
}

.scope-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
}

.scope-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-secondary);
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  margin: 0 8px 8px 0;
  transition: all 0.2s ease;
}

.tag-chip:hover {
  border-color: var(--primary);
  color: var(--primary);
}

@media (min-width: 1024px) {
  .scope-offset {
    margin-top: 32px;
  }
}

/* ---------- Info note ---------- */
.info-note {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--primary-soft);
  border: 1px solid rgba(37, 99, 235, 0.16);
  border-radius: var(--radius-medium);
  padding: 16px 18px;
  margin-top: 26px;
}

.info-note i {
  color: var(--primary);
  font-size: 20px;
  margin-top: 2px;
}

.info-note p {
  color: #334155;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- Process ---------- */
.process-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 40px;
}

.process-grid::before {
  content: "";
  position: absolute;
  left: 10%;
  right: 10%;
  top: 0;
  border-top: 2px dashed var(--line);
}

.process-item {
  position: relative;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
  padding: 66px 18px 22px;
  z-index: 2;
  transition: all 0.25s ease;
}

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

.process-node {
  position: absolute;
  top: -21px;
  left: 50%;
  transform: translateX(-50%);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--line);
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
}

.process-item.done .process-node {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.process-item h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  text-align: center;
}

.process-item p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.75;
  text-align: center;
}

/* ---------- Advantage ---------- */
.advantage-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 30px;
  align-items: center;
}

.adv-quote {
  background: linear-gradient(150deg, var(--primary-soft), rgba(255, 255, 255, 0.6));
  border: 1px solid rgba(37, 99, 235, 0.14);
  border-radius: 18px;
  padding: 28px;
  position: relative;
}

.adv-quote .quote-mark {
  font-size: 44px;
  color: var(--primary-light);
  line-height: 1;
  font-weight: 800;
  display: block;
  margin-bottom: 6px;
}

.adv-quote p {
  color: var(--text);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.7;
}

.adv-quote small {
  display: block;
  margin-top: 12px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 14px;
}

.advantage-list li {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.advantage-list li:last-child {
  border-bottom: none;
}

.adv-icon {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.advantage-list h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 5px;
}

.advantage-list p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- Scene ---------- */
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 6px;
}

.scene-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
  transition: all 0.25s ease;
}

.scene-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(37, 99, 235, 0.25);
  transform: translateY(-2px);
}

.scene-icon {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 19px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.scene-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 7px;
}

.scene-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- FAQ ---------- */
.faq-list {
  margin-top: 8px;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 12px;
  transition: border 0.2s ease, background 0.2s ease;
}

.faq-item[open] {
  border-color: rgba(37, 99, 235, 0.28);
  background: #F8FAFC;
}

.faq-item summary {
  display: flex;
  align-items: center;
  gap: 14px;
  list-style: none;
  padding: 18px 20px;
  cursor: pointer;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary i {
  margin-left: auto;
  color: var(--primary);
  transition: transform 0.3s ease;
}

.faq-item[open] summary i {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 20px 20px 50px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- CTA ---------- */
.cta-area {
  padding: 20px 0 60px;
}

.cta-banner {
  background:
    linear-gradient(rgba(255, 255, 255, 0.94), rgba(238, 244, 255, 0.96)),
    url('/assets/images/backpic/back-2.png') center / cover no-repeat;
  border: 1px solid rgba(37, 99, 235, 0.16);
  border-radius: 22px;
  box-shadow: var(--shadow-md);
  padding: 48px 36px;
  text-align: center;
}

.cta-banner .cta-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.cta-banner h2 {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-banner p {
  max-width: 680px;
  margin: 0 auto 24px;
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.8;
}

.cta-btns {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: #0F172A;
  padding: 60px 0 30px;
  color: #CBD5E1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.3fr;
  gap: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
}

.site-footer .brand {
  color: #fff;
  margin-bottom: 16px;
}

.footer-brand p {
  color: #94A3B8;
  font-size: 14px;
  line-height: 1.75;
  max-width: 340px;
}

.footer-col h4 {
  color: #F1F5F9;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col a {
  color: #CBD5E1;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  line-height: 1.7;
}

.footer-col a:hover {
  color: var(--primary-light);
}

.footer-contact a {
  display: flex;
  margin-bottom: 10px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 24px;
  color: #64748B;
  font-size: 13px;
}

/* ---------- Responsive ---------- */
@media (max-width: 1023px) {
  .header-inner {
    gap: 14px;
  }

  .site-nav {
    margin-left: 0;
  }

  .nav-menu a {
    padding: 9px 10px;
    font-size: 14px;
  }

  .header-cta {
    padding: 0 16px;
  }

  .process-grid {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 40px;
  }

  .process-grid::before {
    display: none;
  }

  .advantage-layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 767px) {
  .header-inner {
    flex-wrap: wrap;
    min-height: 64px;
    padding: 0 16px;
    gap: 10px;
  }

  .site-header {
    position: sticky;
  }

  .breadcrumb, .crumb-list {
    font-size: 13px;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 18px 24px rgba(30, 41, 59, 0.08);
    padding: 14px 16px;
    margin: 0;
  }

  .nav-toggle:checked ~ .site-nav {
    display: block;
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-menu a {
    display: block;
    padding: 14px 16px;
    font-size: 16px;
  }

  .nav-toggle-label {
    display: inline-flex;
  }

  .header-cta {
    margin-left: auto;
    height: 38px;
    padding: 0 14px;
    font-size: 13px;
  }

  .page-hero {
    padding: 32px 0 46px;
  }

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

  .hero-figure {
    margin-top: 24px;
  }

  .cat-detail {
    padding-top: 28px;
  }

  .cat-anchor {
    position: relative;
    top: auto;
  }

  .panel-card {
    padding: 22px;
  }

  .scope-grid, .scene-grid {
    grid-template-columns: 1fr;
  }

  .process-grid {
    grid-template-columns: 1fr;
    row-gap: 42px;
  }

  .cta-banner {
    padding: 30px 22px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 520px) {
  .brand {
    font-size: 16px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    font-size: 17px;
  }

  .header-cta {
    font-size: 12px;
    padding: 0 10px;
  }

  .hero-feature-tags {
    gap: 14px;
    font-size: 13px;
  }

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

  .check-list li {
    gap: 12px;
  }

  .info-note {
    padding: 14px;
  }

  .process-item {
    padding: 64px 16px 18px;
  }

  .cta-banner {
    padding: 28px 14px;
    text-align: center;
  }
}

/* roulang page: category2 */
/* ===== 设计变量与基础重置 ===== */
    :root {
      --primary: #2563EB;
      --primary-dark: #1D4ED8;
      --primary-light: #60A5FA;
      --primary-soft: #EEF4FF;
      --bg-body: #F7F9FC;
      --bg-card: #FFFFFF;
      --border: #E4E9F0;
      --border-strong: #CBD5E1;
      --text-main: #1E293B;
      --text-second: #64748B;
      --text-muted: #94A3B8;
      --success: #10B981;
      --warning: #F59E0B;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-sm: 0 1px 3px rgba(30,41,59,0.06), 0 4px 12px rgba(30,41,59,0.04);
      --shadow-hover: 0 4px 10px rgba(30,41,59,0.06), 0 12px 24px rgba(30,41,59,0.08);
      --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background: var(--bg-body);
      color: var(--text-main);
      font-size: 16px;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      margin: 0 0 0.55em;
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.35;
      text-rendering: optimizeLegibility;
    }

    p { margin: 0 0 1em; }
    a { color: var(--primary); text-decoration: none; transition: color 0.2s ease; }
    a:hover { color: var(--primary-dark); }
    img { display: block; max-width: 100%; height: auto; }
    ul { margin: 0; padding: 0; list-style: none; }
    button, input { font-family: inherit; font-size: inherit; }

    /* ===== 通用布局 ===== */
    .grid-container {
      max-width: 1200px;
      width: 100%;
    }

    /* ===== 按钮体系 ===== */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      height: 44px;
      padding: 0 26px;
      border: 1px solid transparent;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      line-height: 1;
      cursor: pointer;
      text-align: center;
      white-space: nowrap;
      transition: all 0.25s ease;
      border: none;
    }

    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      color: #FFFFFF;
      box-shadow: 0 8px 18px rgba(37, 99, 235, 0.22);
      transform: translateY(-1px);
    }
    .btn-primary:active {
      transform: translateY(0);
      box-shadow: none;
      background: var(--primary-dark);
    }
    .btn-primary:focus-visible {
      outline: 3px solid rgba(37, 99, 235, 0.25);
      outline-offset: 2px;
    }

    .btn-outline {
      background: #FFFFFF;
      border: 1px solid var(--border-strong);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #fff;
      transform: translateY(-1px);
      box-shadow: var(--shadow-sm);
    }
    .btn-outline:focus-visible {
      outline: 3px solid rgba(37, 99, 235, 0.2);
      outline-offset: 2px;
    }

    .btn-lg { height: 48px; padding: 0 30px; font-size: 15px; }

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

    /* ===== 文本笔记与标签 ===== */
    .card-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background: rgba(37, 99, 235, 0.08);
      border-radius: 999px;
      padding: 5px 13px;
      margin-bottom: 14px;
    }

    .card-tag .fa-solid { font-size: 12px; }

    .section-head {
      margin-bottom: 44px;
    }
    .section-head .head-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 10px;
      letter-spacing: 0.02em;
    }
    .section-head h2 {
      font-size: clamp(24px, 2.8vw, 32px);
      font-weight: 700;
      border-left: 4px solid var(--primary);
      padding-left: 16px;
      line-height: 1.4;
    }
    .section-head p {
      max-width: 680px;
      margin: 14px 0 0 20px;
      color: var(--text-second);
      font-size: 16px;
    }

    /* ===== 导航系统 ===== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 60;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: saturate(1.2) blur(8px);
      -webkit-backdrop-filter: saturate(1.2) blur(8px);
      border-bottom: 1px solid var(--border);
    }

    .header-inner {
      max-width: 1200px;
      margin: 0 auto;
      min-height: 70px;
      display: flex;
      align-items: center;
      gap: 22px;
      padding: 0 24px;
      position: relative;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
      white-space: nowrap;
      letter-spacing: -0.01em;
      flex-shrink: 0;
    }
    .brand .brand-mark {
      display: inline-flex;
      width: 36px;
      height: 36px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #fff;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 800;
    }
    .brand:hover span:last-child { color: var(--primary); }

    .site-nav { flex: 1; display: flex; justify-content: flex-end; }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .nav-menu li { margin: 0; }
    .nav-menu a {
      display: inline-block;
      padding: 10px 16px;
      color: var(--text-second);
      border-radius: 8px;
      font-size: 15px;
      font-weight: 500;
      position: relative;
      transition: all 0.25s;
    }
    .nav-menu a:hover {
      color: var(--primary);
      background: var(--primary-soft);
    }
    .nav-menu a.active {
      color: var(--primary);
      background: var(--primary-soft);
      font-weight: 600;
    }

    .header-cta {
      margin-left: auto;
      padding: 0 22px;
      height: 42px;
      font-size: 14px;
      flex-shrink: 0;
    }

    .nav-toggle, .nav-toggle-label { display: none; }

    /* ===== 横条/头部内容 ===== */
    .page-section {
      padding: 78px 0;
    }

    /* ===== 分类页 Hero ===== */
    .category-hero {
      position: relative;
      background: linear-gradient(135deg, #EEF4FF 0%, #F8FAFC 52%, #FFFFFF 100%);
      border-bottom: 1px solid var(--border);
      padding: 66px 0 56px;
      overflow: hidden;
    }

    .category-hero__row {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .category-hero__text { flex: 0 0 58%; max-width: 58%; }
    .category-hero__media { flex: 1; min-width: 0; }

    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 25px;
      flex-wrap: wrap;
    }
    .breadcrumb a { color: var(--text-second); }
    .breadcrumb a:hover { color: var(--primary); }
    .breadcrumb span { color: var(--text-muted); }

    .hero-kicker {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      background: rgba(37, 99, 235, 0.09);
      padding: 6px 14px;
      border-radius: 999px;
      margin-bottom: 18px;
    }

    .category-hero h1 {
      font-size: clamp(30px, 4vw, 44px);
      line-height: 1.25;
      margin-bottom: 16px;
      letter-spacing: -0.02em;
    }

    .category-hero__lead {
      font-size: 17px;
      color: var(--text-second);
      line-height: 1.8;
      max-width: 560px;
      margin-bottom: 26px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 30px;
    }

    .hero-trust-points {
      display: flex;
      flex-wrap: wrap;
      gap: 14px 26px;
      color: var(--text-muted);
      font-size: 13px;
      margin-top: -6px;
    }
    .hero-trust-points span { position: relative; }
    .hero-trust-points span + span::before {
      content: "";
      position: absolute;
      left: -13px;
      top: 50%;
      width: 4px;
      height: 4px;
      border-radius: 50%;
      background: var(--border-strong);
      transform: translateY(-50%);
    }

    .category-hero__media .hero-cover {
      border-radius: 18px;
      overflow: hidden;
      box-shadow: 0 14px 30px rgba(30, 41, 59, 0.12);
      border: 4px solid #fff;
    }
    .hero-cover img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: cover;
    }

    /* ===== 快速目录 ===== */
    .quick-nav-section {
      padding: 24px 0;
      background: var(--bg-card);
      border-bottom: 1px solid var(--border);
    }
    .quick-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 12px;
    }
    .quick-list a {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 12px 20px;
      background: #F7F9FC;
      border: 1px solid var(--border);
      border-radius: 999px;
      color: var(--text-main);
      font-size: 14px;
      font-weight: 600;
      transition: all 0.25s;
    }
    .quick-list a i {
      color: var(--primary);
      font-size: 14px;
    }
    .quick-list a:hover {
      border-color: var(--primary);
      background: var(--primary-soft);
      color: var(--primary);
    }

    /* ===== 玩法瀑布目录 ===== */
    .waterfall-section {
      padding: 90px 0 70px;
      background: var(--bg-body);
    }
    .waterfall-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: start;
      gap: 32px;
    }
    .waterfall-start,
    .waterfall-end {
      display: grid;
      grid-template-columns: 1fr;
      gap: 32px;
      align-content: start;
    }
    .waterfall-end { padding-top: 90px; }

    .wf-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .wf-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .wf-media {
      position: relative;
      aspect-ratio: 16 / 9;
      background: #E2E8F0;
      overflow: hidden;
    }
    .wf-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .wf-media::after {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      bottom: 0;
      height: 90px;
      background: linear-gradient(to top, rgba(15, 23, 42, 0.55), transparent);
      pointer-events: none;
    }
    .wf-type {
      position: absolute;
      left: 18px;
      bottom: 15px;
      z-index: 2;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 255, 255, 0.92);
      color: var(--text-main);
      padding: 6px 13px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(0,0,0,0.06);
    }
    .wf-type i { color: var(--primary); font-size: 12px; }

    .wf-body {
      padding: 28px 28px 26px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }
    .wf-body .card-tag { margin-top: -4px; }

    .wf-body h3 {
      font-size: 20px;
      line-height: 1.5;
      font-weight: 700;
      margin-bottom: 14px;
    }
    .wf-body p {
      color: var(--text-second);
      font-size: 15px;
      line-height: 1.85;
      margin-bottom: 18px;
    }

    .feature-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px 18px;
      margin: 4px 0 20px;
      padding-top: 8px;
      border-top: 1px dashed var(--border);
    }
    .feature-list li {
      font-size: 14px;
      color: var(--text-second);
      line-height: 1.7;
      display: flex;
      gap: 8px;
    }
    .feature-list li i {
      color: var(--success);
      flex-shrink: 0;
      margin-top: 4px;
      font-size: 13px;
    }

    .text-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--primary);
      font-weight: 600;
      font-size: 14px;
      margin-top: auto;
      transition: gap 0.2s ease;
    }
    .text-link:hover { gap: 10px; color: var(--primary-dark); }
    .text-link i { font-size: 12px; }

    /* ===== 信息提示条 ===== */
    .category-tip-strip {
      padding: 56px 0 30px;
      background: var(--bg-body);
    }
    .tip-inner {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 26px 30px;
      display: flex;
      align-items: flex-start;
      gap: 22px;
      box-shadow: var(--shadow-sm);
      max-width: 1100px;
      margin: 0 auto;
    }
    .tip-inner .tip-icon {
      width: 46px;
      height: 46px;
      flex-shrink: 0;
      background: var(--primary-soft);
      color: var(--primary);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
    }
    .tip-inner .tip-body strong {
      display: block;
      font-size: 16px;
      margin-bottom: 6px;
    }
    .tip-inner .tip-body p {
      font-size: 15px;
      line-height: 1.8;
      color: var(--text-second);
      margin: 0;
    }

    /* ===== 学习路径 ===== */
    .path-section {
      padding: 70px 0 80px;
      background: #FFFFFF;
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }

    .path-grid {
      display: flex;
      align-items: flex-start;
      gap: 24px;
      margin-top: 48px;
      position: relative;
    }
    .path-card {
      flex: 1;
      position: relative;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 24px 22px;
      box-shadow: var(--shadow-sm);
      transition: 0.25s ease;
    }
    .path-card:nth-child(even) { margin-top: 22px; }
    .path-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
    .path-card::before {
      content: "";
      position: absolute;
      left: -25px;
      top: 64px;
      width: 25px;
      border-top: 2px dashed #CBD5E1;
      z-index: 0;
    }
    .path-card:first-child::before {
      display: none;
    }

    .step-node {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #EAF0F8;
      border: 2px solid var(--border-strong);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .path-card.step-done .step-node,
    .path-card:nth-child(2) .step-node {
      background: var(--primary);
      border-color: var(--primary);
      color: #FFFFFF;
    }
    .path-card.step-light .step-node {
      background: var(--primary-soft);
      border-color: var(--primary-light);
      color: var(--primary);
    }
    .path-card h3 {
      font-size: 17px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .path-card p {
      font-size: 14px;
      line-height: 1.75;
      color: var(--text-second);
      margin-bottom: 0;
    }

    /* ===== FAQ ===== */
    .faq-section {
      padding: 84px 0;
      background: #F7F9FC;
    }
    .faq-half {
      display: grid;
      grid-template-columns: 0.85fr 1.6fr;
      gap: 44px;
      align-items: start;
    }
    .faq-title-box h2 {
      border-left: 4px solid var(--primary);
      padding-left: 16px;
      font-size: clamp(23px, 2.6vw, 31px);
    }
    .faq-title-box p {
      color: var(--text-second);
      margin-left: 20px;
      font-size: 15px;
      margin-top: 14px;
    }

    .faq-list {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-item + .faq-item { border-top: 1px solid var(--border); }
    .faq-q {
      width: 100%;
      background: transparent;
      border: 0;
      text-align: left;
      display: flex;
      justify-content: space-between;
      gap: 16px;
      align-items: center;
      padding: 19px 22px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      transition: background 0.2s;
      min-height: 58px;
    }
    .faq-q:hover { background: #F8FAFC; }
    .faq-q:focus-visible {
      outline: 3px solid rgba(37,99,235,0.2);
      outline-offset: -3px;
    }
    .faq-q i {
      font-size: 14px;
      color: var(--text-muted);
      transition: transform 0.3s ease;
      flex-shrink: 0;
    }
    .faq-item.open .faq-q i { transform: rotate(180deg); color: var(--primary); }
    .faq-item.open .faq-q { background: #F8FAFC; }

    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }
    .faq-item.open .faq-a { max-height: 400px; }
    .faq-a p {
      margin: 0;
      padding: 2px 24px 24px;
      color: var(--text-second);
      font-size: 15px;
      line-height: 1.85;
      background: #F8FAFC;
      border-left: 3px solid var(--primary-light);
    }

    /* ===== CTA横幅 ===== */
    .cta-banner {
      padding: 0;
      background: linear-gradient(135deg, #EEF4FF 0%, #FFFFFF 80%);
      border-bottom: 1px solid var(--border);
    }
    .cta-inner {
      max-width: 1000px;
      margin: 0 auto;
      text-align: center;
      padding: 80px 24px;
    }
    .cta-inner h2 {
      font-size: clamp(24px, 3vw, 33px);
      margin-bottom: 14px;
    }
    .cta-inner p {
      color: var(--text-second);
      font-size: 16px;
      line-height: 1.8;
      margin-bottom: 28px;
    }
    .cta-btn-group {
      display: flex;
      justify-content: center;
      gap: 14px;
      flex-wrap: wrap;
    }

    /* ===== 页脚 ===== */
    .site-footer {
      background: #0F172A;
      color: #94A3B8;
      padding: 58px 0 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.6fr 0.9fr 0.9fr 1fr;
      gap: 34px;
      padding-bottom: 30px;
    }
    .site-footer .brand {
      color: #fff;
      margin-bottom: 14px;
    }
    .site-footer .brand .brand-mark {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #fff;
    }
    .site-footer .brand:hover span:last-child { color: var(--primary-light); }
    .footer-brand p {
      font-size: 14px;
      line-height: 1.8;
      max-width: 280px;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 16px;
      margin-bottom: 18px;
      font-weight: 600;
      border-left: 3px solid var(--primary-light);
      padding-left: 10px;
    }
    .footer-col ul li { margin-bottom: 11px; }
    .footer-col ul a,
    .footer-contact a {
      color: #94A3B8;
      font-size: 14px;
      transition: color 0.2s;
    }
    .footer-col ul a:hover,
    .footer-contact a:hover { color: var(--primary-light); }
    .footer-contact a {
      display: flex;
      align-items: center;
      gap: 9px;
      margin-bottom: 13px;
      font-size: 14px;
    }
    .footer-contact a i { color: var(--primary-light); width: 16px; }
    .footer-bottom {
      border-top: 1px solid rgba(148,163,184,0.14);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
      padding: 18px 0 22px;
      font-size: 13px;
      color: #64748B;
    }

    /* ===== 响应式 ===== */
    @media (max-width: 1023.98px) {
      .nav-toggle-label {
        display: inline-flex;
        width: 42px;
        height: 42px;
        align-items: center;
        justify-content: center;
        border-radius: 8px;
        border: 1px solid var(--border);
        color: var(--text-main);
        cursor: pointer;
        margin-left: 4px;
        flex-shrink: 0;
        font-size: 18px;
        transition: all 0.2s;
      }
      .nav-toggle-label:hover { background: var(--primary-soft); color: var(--primary); }

      .site-nav {
        position: fixed;
        top: 71px;
        right: 0;
        width: min(78vw, 360px);
        height: auto;
        max-height: calc(100vh - 80px);
        overflow-y: auto;
        background: #FFFFFF;
        border-left: 1px solid var(--border);
        box-shadow: 0 24px 48px rgba(15,23,42,0.18);
        border-radius: 0 0 0 16px;
        padding: 18px;
        transform: translateX(105%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.32s ease, opacity 0.32s ease;
      }
      .nav-menu {
        flex-direction: column;
        gap: 6px;
        align-items: stretch;
      }
      .nav-menu a {
        display: block;
        padding: 12px 18px;
        border-radius: 10px;
        font-size: 15px;
      }
      .nav-menu a.active {
        background: var(--primary-soft);
        color: var(--primary);
      }
      .nav-toggle:checked ~ .site-nav {
        transform: translateX(0);
        opacity: 1;
        pointer-events: auto;
      }
      .header-cta {
        margin-left: auto;
        padding: 0 18px;
        height: 40px;
        font-size: 13px;
      }

      .category-hero__row {
        display: flex;
        flex-direction: column;
        gap: 32px;
      }
      .category-hero__text,
      .category-hero__media { flex: 1 1 100%; max-width: 100%; width: 100%; }

      .waterfall-grid {
        grid-template-columns: 1fr;
      }
      .waterfall-end {
        padding-top: 0;
      }

      .faq-half {
        grid-template-columns: 1fr;
        gap: 28px;
      }

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

    @media (max-width: 639.98px) {
      .header-inner {
        padding: 0 14px;
        gap: 10px;
        min-height: 62px;
      }
      .brand { font-size: 17px; gap: 8px; }
      .brand .brand-mark { width: 30px; height: 30px; min-width: 30px; font-size: 16px; border-radius: 9px; }
      .brand span:last-child {
        max-width: 138px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
      }
      .header-cta {
        height: 36px;
        padding: 0 13px;
        font-size: 13px;
        margin-left: auto;
      }
      .nav-toggle-label { width: 36px; height: 36px; font-size: 15px; }
      .site-nav { top: 63px; }

      .category-hero {
        padding: 42px 0 38px;
      }
      .category-hero h1 {
        font-size: 32px;
      }
      .category-hero__lead {
        font-size: 16px;
      }
      .hero-actions .btn {
        width: 100%;
        margin-bottom: 0;
      }

      .quick-list a {
        padding: 10px 15px;
        font-size: 13px;
      }

      .waterfall-section,
      .path-section,
      .faq-section {
        padding: 54px 0;
      }
      .wf-body {
        padding: 20px 20px 18px;
      }
      .feature-list {
        grid-template-columns: 1fr;
      }
      .wf-type {
        left: 14px;
        bottom: 12px;
        padding: 5px 10px;
        font-size: 12px;
      }
      .wf-body h3 { font-size: 18px; }

      .tip-inner {
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
      }

      .path-grid {
        flex-direction: column;
      }
      .path-card::before { display: none; }
      .path-card:nth-child(even) { margin-top: 0; }

      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        justify-content: flex-start;
        text-align: left;
        align-items: flex-start;
      }
    }

    @media (max-width: 360px) {
      .header-cta { display: none; }
      .nav-toggle-label { margin-left: auto; }
    }

    @media (prefers-reduced-motion: reduce) {
      * { transition: none !important; animation: none !important; }
      html { scroll-behavior: auto; }
    }

/* roulang page: category3 */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #60A5FA;
  --bg-light: #F7F9FC;
  --bg-soft: #EEF4FF;
  --card-bg: #FFFFFF;
  --text-main: #1E293B;
  --text-sub: #64748B;
  --text-time: #94A3B8;
  --border: #E4E9F0;
  --success: #10B981;
  --warning: #F59E0B;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 1px 3px rgba(30,41,59,.06), 0 4px 12px rgba(30,41,59,.04);
  --shadow-hover: 0 4px 10px rgba(30,41,59,.06), 0 12px 24px rgba(30,41,59,.08);
  --transition: .25s ease;
  --footer-bg: #0F172A;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8;color:var(--text-main);background:var(--bg-light);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;cursor:pointer}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.grid-container{max-width:1200px}
h1,h2,h3{line-height:1.35;color:var(--text-main)}
::selection{background:rgba(37,99,235,.15)}

/* header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);backdrop-filter:saturate(1.2);border-bottom:1px solid var(--border)}
.header-inner{max-width:1200px;margin:0 auto;height:72px;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:700;color:var(--text-main);white-space:nowrap}
.brand-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;box-shadow:0 4px 10px rgba(37,99,235,.25)}
.site-nav{margin-left:auto}
.nav-menu{display:flex;gap:6px;align-items:center}
.nav-menu a{display:block;padding:9px 14px;border-radius:8px;font-size:15px;color:var(--text-main);font-weight:500;transition:background .2s,color .2s}
.nav-menu a:hover{background:var(--bg-soft);color:var(--primary)}
.nav-menu a.active{color:var(--primary);font-weight:600;position:relative}
.nav-menu a.active::after{content:"";position:absolute;bottom:0;left:14px;right:14px;height:2px;border-radius:2px;background:var(--primary)}
.header-cta{flex-shrink:0;height:42px;padding:0 24px;display:inline-flex;align-items:center;justify-content:center;background:var(--primary);color:#fff;border-radius:8px;font-size:15px;font-weight:600;letter-spacing:.02em;transition:background .25s,transform .2s,box-shadow .2s}
.header-cta:hover{background:var(--primary-dark);box-shadow:0 6px 16px rgba(37,99,235,.28);transform:translateY(-1px)}
.nav-toggle{display:none}
.nav-toggle-label{display:none}

/* btn */
.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:8px;height:46px;padding:0 28px;font-size:15px;font-weight:600;transition:all .25s ease}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 6px rgba(37,99,235,.18)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 8px 20px rgba(37,99,235,.25)}
.btn-primary:active{transform:translateY(0)}
.btn-outline{background:#fff;border:1px solid #CBD5E1;color:var(--text-main)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary);background:#fff}
.btn-light{background:#fff;color:var(--primary);border-radius:8px;height:46px;padding:0 30px;font-weight:600}
.btn-light:hover{background:#EFF6FF;transform:translateY(-1px)}
.btn-lg{min-width:180px;height:50px;padding:0 36px;border-radius:10px}

/* section spacing */
.section-block{padding:84px 0}
.section-header{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:36px}
.section-title{font-size:clamp(22px,2.6vw,32px);font-weight:700;padding-left:14px;position:relative;line-height:1.4}
.section-title::before{content:"";position:absolute;left:0;top:.15em;width:4px;height:1.1em;background:var(--primary);border-radius:4px}
.section-desc{color:var(--text-sub);margin-top:8px;font-size:15px;line-height:1.7}

/* page hero */
.page-hero{background:linear-gradient(135deg,#EEF4FF 0%,#FFFFFF 62%);position:relative;overflow:hidden;padding:64px 0 40px}
.page-hero .hero-grid{display:flex;align-items:center;gap:50px;max-width:1200px;margin:0 auto;padding:0 24px}
.hero-copy{flex:1.15}
.hero-copy .kicker{display:inline-flex;align-items:center;gap:8px;background:rgba(37,99,235,.1);color:var(--primary);font-size:13px;font-weight:600;padding:5px 14px;border-radius:999px;margin-bottom:18px}
.hero-copy .kicker i{font-size:12px}
.page-hero h1{font-size:clamp(30px,4vw,44px);font-weight:700;margin-bottom:14px;line-height:1.28}
.hero-sub{color:var(--text-sub);font-size:17px;max-width:600px;line-height:1.85;margin-bottom:30px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.hero-note-row{margin-top:26px;display:flex;flex-wrap:wrap;gap:18px;color:var(--text-time);font-size:13px}
.hero-note-row span{display:flex;align-items:center;gap:6px}
.hero-note-row i{color:var(--success)}
.hero-visual{flex:1;position:relative}
.hero-visual .img-wrap{border-radius:20px;overflow:hidden;box-shadow:0 20px 44px rgba(37,99,235,.16);background:#fff;transform:rotate(.6deg)}
.hero-visual .img-wrap img{width:100%;aspect-ratio:4/3.3;object-fit:cover}
.hero-float-badge{position:absolute;left:-14px;bottom:22px;background:#fff;box-shadow:var(--shadow-card);border-radius:14px;padding:12px 18px;display:flex;align-items:center;gap:12px}
.hero-float-badge .fb-icon{width:40px;height:40px;border-radius:10px;background:#EEF4FF;color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:18px}

/* full banner */
.full-guide-banner{margin:70px auto 0;border-radius:20px;position:relative;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;min-height:230px;display:flex;align-items:center;overflow:hidden;box-shadow:var(--shadow-card)}
.full-guide-banner::before{content:" ";position:absolute;inset:0;background:linear-gradient(100deg,rgba(37,99,235,.88),rgba(37,99,235,.52))}
.banner-content{position:relative;z-index:2;color:#fff;max-width:720px;padding:42px 44px}
.banner-content h3{color:#fff;font-size:clamp(22px,2.6vw,30px);margin-bottom:12px;font-weight:700}
.banner-content p{font-size:15px;line-height:1.8;opacity:.9;margin-bottom:0}
.banner-stats{display:flex;gap:32px;margin-top:24px;flex-wrap:wrap}
.banner-stats .stat .num{font-size:24px;font-weight:700;display:block;margin-top:6px}
.banner-stats .stat span{font-size:13px;opacity:.85}
.info-strip{margin-top:50px;background:#fff;border:1px solid #DDE7FA;border-radius:14px;padding:20px 26px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.info-strip i{color:var(--primary);font-size:22px}
.info-strip p{color:var(--text-sub);font-size:14px;line-height:1.75;max-width:760px}

/* vertical stack zone */
.zone-block{padding:72px 0;border-bottom:1px solid var(--border)}
.zone-block:last-of-type{border-bottom:none}
.zone-inner{display:flex;gap:56px;align-items:flex-start}
.zone-side{flex:0 0 280px;position:sticky;top:120px}
.zone-side .z-num{width:48px;height:48px;border-radius:12px;background:var(--bg-soft);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:700;margin-bottom:18px}
.zone-side h3{font-size:22px;font-weight:700;line-height:1.5;margin-bottom:12px}
.zone-side p{color:var(--text-sub);font-size:14px;line-height:1.8}
.zone-body{flex:1;}
.zone-img{border-radius:16px;overflow:hidden;box-shadow:var(--shadow-card);margin-bottom:30px}
.zone-img img{width:100%;aspect-ratio:16/6.5;object-fit:cover}
.zone-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.tiny-card{background:#fff;border:1px solid var(--border);box-shadow:var(--shadow-card);border-radius:14px;padding:22px}
.tiny-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px)}
.tc-icon{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;margin-bottom:14px}
.tc-icon.blue{background:#EEF4FF;color:var(--primary)}
.tc-icon.green{background:#D9F5EC;color:var(--success)}
.tc-icon.orange{background:#FFF3E0;color:var(--warning)}
.tc-icon.sky{background:#E8F2FC;color:#0EA5E9}
.tiny-card h4{font-size:16px;font-weight:600;margin-bottom:8px}
.tiny-card p{font-size:13px;color:var(--text-sub);line-height:1.7}
.tc-note{margin-top:10px;font-size:12px;color:var(--text-time);border-top:1px dashed #E4E9F0;padding-top:10px}
.tc-note i{margin-right:5px;color:var(--primary-light)}

/* membership zone */
.member-zone .zone-inner{flex-direction:row-reverse}
.member-benefit{display:flex;flex-wrap:wrap;gap:22px 38px;background:#fff;border:1px solid var(--border);border-radius:16px;padding:32px;box-shadow:var(--shadow-card)}
.mb-item{flex:1 1 200px}
.mb-item .mb-title{font-size:14px;font-weight:600;margin-bottom:4px;display:flex;align-items:center;gap:8px}
.mb-item .mb-title i{color:var(--primary)}
.mb-item p{font-size:13px;color:var(--text-time);line-height:1.7}
.member-note{margin-top:16px;font-size:13px;color:var(--text-sub);background:#F7F9FC;padding:12px 20px;border-radius:8px}

/* process block */
.process-list{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:36px}
.process-item{background:#fff;border:1px solid var(--border);border-radius:14px;padding:26px 22px;box-shadow:var(--shadow-card);position:relative;transition:all .25s}
.process-item:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.process-step{width:32px;height:32px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;margin-bottom:16px}
.process-item h4{font-size:16px;font-weight:600;margin-bottom:8px}
.process-item p{font-size:13px;color:var(--text-sub);line-height:1.75}
.process-line{display:none}

/* faq */
.faq-zone{background:var(--bg-soft)}
.faq-wrap{display:flex;gap:50px;align-items:flex-start}
.faq-side{flex:0 0 280px}
.faq-side h2{font-size:30px;font-weight:700;line-height:1.4;margin-bottom:14px}
.faq-side p{color:var(--text-lead);color:var(--text-sub);font-size:15px;line-height:1.8}
.faq-list{flex:1}
.faq-item{background:#fff;border-radius:12px;border:1px solid var(--border);margin-bottom:14px;overflow:hidden;box-shadow:0 1px 2px rgba(30,41,59,.04)}
.faq-item details>summary{list-style:none}
.faq-item details>summary::-webkit-details-marker{display:none}
.faq-question{display:flex;align-items:center;gap:14px;cursor:pointer;padding:18px 20px;font-weight:600;transition:background .2s}
.faq-question i{color:var(--primary);font-size:16px}
.faq-question .arrow{margin-left:auto;color:var(--text-time);transition:transform .3s;font-size:14px}
.faq-item details[open] .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 20px 20px 50px;font-size:14px;color:var(--text-sub);line-height:1.85}
.faq-item:first-child .faq-question{background:#F8FAFC}

/* cta */
.cta-area{background:url('/assets/images/backpic/back-1.webp') center/cover no-repeat;position:relative;padding:70px 0;text-align:center}
.cta-area::before{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(29,78,216,.93),rgba(37,99,235,.82))}
.cta-inner{position:relative;z-index:2}
.cta-area h2{color:#fff;font-size:clamp(24px,3vw,34px);margin-bottom:12px;font-weight:700}
.cta-area p{color:rgba(255,255,255,.9);font-size:15px;margin-bottom:28px}
.cta-area .btn-white{background:#fff;color:var(--primary);height:50px;padding:0 34px;border-radius:10px;font-weight:700;display:inline-flex;align-items:center;gap:8px}
.cta-area .btn-white:hover{background:#EFF6FF;transform:translateY(-2px)}
.cta-safe-row{display:flex;justify-content:center;gap:18px;margin-top:18px;font-size:13px;color:rgba(255,255,255,.8);flex-wrap:wrap}

/* footer */
.site-footer{background:#0F172A;color:#96A3B5;padding-top:64px;font-size:14px;line-height:2}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr .9fr 1.2fr;gap:48px;padding-bottom:40px}
.footer-brand .brand{color:#fff;font-size:17px;margin-bottom:12px}
.footer-brand p{margin-left:0;line-height:1.9;font-size:13px}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:16px;font-weight:600}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a{font-size:14px;transition:color .2s}
.footer-col ul li a:hover{color:#60A5FA}
.footer-contact a{display:block;color:#96A3B5;margin-bottom:10px;transition:color .2s}
.footer-contact a:hover{color:#60A5FA}
.footer-contact i{width:20px;margin-right:6px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.07);padding:18px 0;margin-top:10px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:12px}
.footer-bottom span{opacity:.65}

/* responsive */
@media screen and (max-width:1024px){
.header-inner{height:64px}
.nav-menu a{padding:8px 9px;font-size:14px}
.header-cta{height:38px;padding:0 14px;font-size:14px}
.hero-grid{flex-direction:column-reverse;gap:28px}
.hero-copy{max-width:720px}
.page-hero{padding:40px 0}
.zone-inner{display:block}
.zone-side{position:static;margin-bottom:24px}
.process-list{grid-template-columns:repeat(2,1fr)}
.faq-wrap{display:block}
.faq-side{margin-bottom:24px}
.footer-grid{grid-template-columns:1fr 1fr}
}

@media screen and (max-width:768px){
.section-block{padding:56px 0}
.zone-block{padding:52px 0}
.view-more{font-size:13px}
.header-inner{flex-wrap:wrap;gap:0;padding:0 16px;height:auto;min-height:64px}
.site-nav{position:fixed;top:0;right:-286px;width:280px;height:100vh;background:#fff;padding:80px 20px 20px;box-shadow:-8px 0 30px rgba(0,0,0,.08);transition:right .3s;z-index:200}
.nav-menu{flex-direction:column;align-items:stretch;gap:6px}
.nav-menu a{display:block;padding:12px 16px;border-radius:8px}
.nav-menu a.active{background:var(--bg-soft)}
.nav-menu a.active::after{display:none}
.nav-toggle{display:none}
.nav-toggle:checked~.site-nav{right:0}
.nav-toggle-label{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;margin-left:auto;color:var(--text-main);border-radius:8px;font-size:18px;cursor:pointer}
.header-cta{margin-right:8px;order:2}
.brand{order:0}
.zone-cards{grid-template-columns:1fr 1fr}
.process-list{grid-template-columns:1fr;gap:12px}
.full-guide-banner .banner-content{padding:28px}
.hero-float-badge{display:none}
.footer-grid{grid-template-columns:1fr;gap:28px}
}

@media screen and (max-width:520px){
.zone-cards{grid-template-columns:1fr}
.hero-actions{display:grid;grid-template-columns:1fr 1fr}
.hero-actions .btn{width:100%;padding:0 10px}
.info-strip{flex-direction:column;align-items:flex-start;padding:18px}
.member-benefit{padding:22px;gap:18px}
.section-header{flex-direction:column;gap:10px}
.section-title{font-size:21px}
.page-hero h1{font-size:28px}
.header-cta{display:none}
}

/* roulang page: category4 */
:root {
  --blue: #2563EB;
  --blue-dark: #1D4ED8;
  --blue-light: #60A5FA;
  --blue-tint: #EEF4FF;
  --bg: #F7F9FC;
  --surface: #FFFFFF;
  --text: #1E293B;
  --muted: #64748B;
  --dim: #94A3B8;
  --line: #E4E9F0;
  --green: #10B981;
  --amber: #F59E0B;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(30,41,59,0.06), 0 4px 12px rgba(30,41,59,0.04);
  --shadow-md: 0 4px 10px rgba(30,41,59,0.06), 0 12px 24px rgba(30,41,59,0.08);
  --section-space: 90px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  transition: color 0.2s, background-color 0.2s, border-color 0.2s, box-shadow 0.2s;
}

ul,
ol {
  margin: 0;
}

.grid-container {
  max-width: 1200px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(1.4) blur(6px);
  -webkit-backdrop-filter: saturate(1.4) blur(6px);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  gap: 20px;
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 19px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  color: var(--blue);
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue), #7AA9FF);
  color: #FFFFFF;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 14px rgba(37, 99, 235, 0.25);
  flex: 0 0 36px;
}

.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-menu {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-menu a {
  display: inline-block;
  padding: 9px 13px;
  color: #334155;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 8px;
  position: relative;
}

.nav-menu a:hover {
  background: var(--blue-tint);
  color: var(--blue);
}

.nav-menu a.active {
  color: var(--blue);
  background: #F7FAFF;
}

.nav-menu a.active::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: var(--blue);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 30px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--blue);
  color: #FFFFFF;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background: var(--blue-dark);
  color: #FFFFFF;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.28);
  transform: translateY(-1px);
}

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

.btn-secondary {
  background: #FFFFFF;
  border-color: #CBD5E1;
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--blue);
  color: var(--blue);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.header-cta {
  height: 40px;
  padding: 0 20px;
  font-size: 14px;
}

.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  color: var(--text);
  cursor: pointer;
  border: 1px solid var(--line);
  background: #FFFFFF;
}

.nav-toggle-label:hover {
  color: var(--blue);
  border-color: var(--blue-light);
}

/* Hero */
.cat-hero {
  position: relative;
  padding: 82px 0 64px;
  background-color: var(--blue-tint);
  background-image: linear-gradient(120deg, rgba(238, 244, 255, 0.94), rgba(255, 255, 255, 0.92)), url("/assets/images/backpic/back-2.png");
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid #DDE6F5;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.8);
  padding: 6px 14px;
  border: 1px solid #D9E5FB;
  border-radius: 999px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 22px;
}

.hero-title {
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.25;
  font-weight: 700;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.hero-lead {
  color: #334155;
  font-size: 17px;
  line-height: 1.9;
  max-width: 560px;
  margin: 0 0 30px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 32px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  color: var(--muted);
  font-size: 14px;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.hero-meta i {
  color: var(--blue);
}

.hero-visual {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-md);
  background: #E2E8F0;
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* trust belt */
.trust-belt {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}

.trust-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.trust-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #475569;
  font-size: 14px;
  background: #F8FAFC;
  border: 1px solid #EEF1F5;
  border-radius: 999px;
  padding: 9px 18px;
}

.trust-list i {
  color: var(--blue);
  font-size: 15px;
}

/* Section base */
.site-section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

.section-white {
  background: var(--surface);
}

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

.section-title {
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.4;
  font-weight: 700;
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title::before {
  content: "";
  width: 4px;
  height: 24px;
  background: var(--blue);
  border-radius: 4px;
  flex: 0 0 4px;
}

.section-desc {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
  margin: 0 0 36px;
}

.section-head {
  margin-bottom: 18px;
}

/* Article narrow */
.reading-zone {
  padding: var(--section-space) 0;
}

.reading-card {
  max-width: 880px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 46px 54px;
}

.article-lead {
  font-size: 18px;
  line-height: 1.9;
  color: #334155;
  font-weight: 500;
  margin: 0 0 22px;
}

.reading-body p {
  color: #34465A;
  font-size: 16px;
  line-height: 1.9;
  margin: 0 0 22px;
}

.content-figure {
  margin: 34px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: #E2E8F0;
}

.content-figure img {
  width: 100%;
  aspect-ratio: 16 / 8.6;
  object-fit: cover;
}

.content-figure figcaption {
  padding: 10px 16px;
  background: #F8FAFC;
  color: var(--dim);
  font-size: 13px;
  border-top: 1px solid var(--line);
}

.info-callout {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--blue-tint);
  border: 1px solid #D6E4FF;
  border-radius: 14px;
  padding: 24px 26px;
  margin: 34px 0;
}

.info-callout i {
  color: var(--blue);
  font-size: 20px;
  margin-top: 4px;
}

.info-callout strong {
  display: block;
  color: var(--text);
  font-size: 15px;
  margin-bottom: 4px;
}

.info-callout p {
  margin: 0;
  color: #475569;
  font-size: 15px;
  line-height: 1.75;
}

.group-title {
  font-size: 22px;
  line-height: 1.5;
  font-weight: 700;
  margin: 34px 0 14px;
}

.group-title em {
  font-style: normal;
  color: var(--blue);
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0 0 30px;
  display: grid;
  gap: 14px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: #34465A;
  font-size: 15px;
  line-height: 1.8;
  background: #F8FAFC;
  border: 1px solid #EDF1F5;
  border-radius: var(--radius-sm);
  padding: 16px 18px;
}

.feature-list i {
  color: var(--green);
  margin-top: 5px;
}

/* service grid */
.service-zone {
  padding: var(--section-space) 0;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.service-zone .cell {
  margin-bottom: 28px;
}

.svc-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 28px 24px 26px;
  height: calc(100% - 28px);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  position: relative;
  overflow: hidden;
}

.svc-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--blue-light));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s ease;
}

.svc-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #D6E4FF;
}

.svc-card:hover::after {
  transform: scaleX(1);
}

.svc-icon {
  width: 48px;
  height: 48px;
  border-radius: 13px;
  background: var(--blue-tint);
  color: var(--blue);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 20px;
}

.svc-card h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  margin: 0 0 10px;
}

.svc-card p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
}

/* FAQ */
.faq-zone {
  background: var(--bg);
  padding: var(--section-space) 0;
}

.faq-wrap {
  max-width: 880px;
  margin: 0 auto;
}

.faq-wrap .section-title {
  justify-content: center;
}

.faq-wrap .section-title::before {
  display: none;
}

.faq-list {
  display: grid;
  gap: 16px;
}

details.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 26px;
  box-shadow: var(--shadow-sm);
}

details.faq-item[open] {
  border-color: #D6E4FF;
  box-shadow: var(--shadow-md);
}

summary {
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 4px 0;
}

summary::-webkit-details-marker {
  display: none;
}

summary .faq-arrow {
  color: var(--blue);
  font-size: 14px;
  transition: transform 0.3s ease;
  flex: 0 0 auto;
}

details[open] summary .faq-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  padding: 14px 0 4px;
  border-top: 1px dashed var(--line);
  margin-top: 14px;
}

.faq-answer p {
  margin: 0;
}

/* CTA */
.cta-zone {
  padding: 90px 0;
  background: linear-gradient(135deg, #E5EEFF, #F7FAFF 70%), var(--blue-tint);
  border-top: 1px solid #D8E4FB;
}

.cta-box {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

.cta-box h2 {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.4;
  margin: 0 0 14px;
}

.cta-box p {
  color: var(--muted);
  font-size: 16px;
  margin: 0 auto 32px;
  max-width: 520px;
}

.cta-box .hero-actions {
  justify-content: center;
  margin-bottom: 0;
}

/* Footer */
.site-footer {
  background: #0F172A;
  color: #CBD5E1;
  padding-top: 64px;
  border-top: 4px solid #1E2A44;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.4fr;
  gap: 36px;
  padding-bottom: 40px;
}

.site-footer .brand {
  color: #FFFFFF;
  margin-bottom: 14px;
}

.site-footer .brand-mark {
  background: linear-gradient(135deg, var(--blue), #7AA9FF);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.14);
}

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

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.footer-col a {
  color: #B4C1D6;
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--blue-light);
}

.footer-brand p {
  color: #8FA2BC;
  font-size: 14px;
  line-height: 1.8;
  max-width: 260px;
}

.footer-contact {
  display: grid;
  gap: 12px;
  align-content: start;
}

.footer-contact a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.footer-contact a i {
  width: 18px;
  color: var(--blue-light);
}

.footer-bottom {
  border-top: 1px solid #25324A;
  padding: 20px 0 28px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: #7F93AD;
  font-size: 13px;
}

/* focus states */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.3);
  outline-offset: 2px;
  border-radius: 6px;
}

@media (max-width: 1023px) {
  .reading-card {
    padding: 38px 40px;
  }
}

@media (max-width: 840px) {
  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .site-nav {
    display: none;
  }

  .nav-toggle-label {
    display: inline-flex;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #FFFFFF;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 30px rgba(15, 23, 42, 0.12);
    padding: 18px 22px 24px;
    border-radius: 0 0 16px 16px;
  }

  .nav-toggle:checked ~ .site-nav {
    display: block;
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .nav-menu a {
    display: block;
    padding: 12px 14px;
    font-size: 16px;
  }

  .nav-menu a.active::after {
    left: 14px;
    right: auto;
    width: 24px;
  }

  .header-cta {
    font-size: 13px;
    padding: 0 14px;
  }

  .hero-title {
    font-size: 32px;
  }

  .cat-hero {
    padding: 56px 0 48px;
  }

  .reading-zone {
    padding: 56px 0;
  }

  .service-zone,
  .faq-zone {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .cta-zone {
    padding: 60px 0;
  }

  .site-section {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 639px) {
  .brand {
    font-size: 16px;
    gap: 8px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
    font-size: 15px;
    flex-basis: 32px;
  }

  .header-cta {
    height: 36px;
    padding: 0 12px;
    font-size: 13px;
  }

  .header-inner {
    height: 64px;
  }

  .hero-eyebrow {
    font-size: 13px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-meta {
    font-size: 13px;
  }

  .trust-list {
    justify-content: flex-start;
  }

  .trust-list li {
    padding: 8px 14px;
  }

  .reading-card {
    padding: 24px 20px;
    border-radius: 14px;
  }

  .article-lead {
    font-size: 17px;
  }

  .reading-body p {
    font-size: 15px;
  }

  .info-callout {
    flex-direction: column;
    padding: 20px;
  }

  .section-title {
    flex-wrap: wrap;
  }

  .svc-card h3 {
    font-size: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-meta {
    align-items: flex-start;
  }

  .cta-box .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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