/* roulang page: index */
:root{
  --blue:#1f5fa8;
  --blue-dark:#0f3c6e;
  --blue-soft:#e8f0fb;
  --blue-mid:#c9dcf3;
  --orange:#f08a24;
  --orange-dark:#d9740f;
  --bg:#f7fafd;
  --white:#ffffff;
  --text:#1d2b3a;
  --muted:#5d7186;
  --border:#e3ebf5;
  --radius:12px;
  --radius-sm:8px;
  --radius-lg:16px;
  --shadow:0 6px 20px rgba(31,95,168,.07);
  --shadow-md:0 10px 28px rgba(31,95,168,.11);
  --shadow-lg:0 14px 34px rgba(31,95,168,.14);
  --max:1200px;
  --gap:24px;
  --section-pad:88px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--blue);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--blue-dark);text-decoration:underline}
h1,h2,h3,h4{margin:0;color:var(--blue-dark);line-height:1.35;font-weight:700}
h1{font-size:40px;letter-spacing:-.5px}
h2{font-size:30px}
h3{font-size:20px;font-weight:600}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit;cursor:pointer}
input,textarea,select{font-family:inherit;font-size:15px}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px}
.container{max-width:var(--max);margin:0 auto;padding:0 24px;width:100%}

/* ============ Header / Nav ============ */
.site-header{
  position:sticky;top:0;z-index:200;
  background:#fff;
  border-bottom:1px solid var(--border);
  transition:box-shadow .25s ease;
}
.site-header.scrolled{box-shadow:0 6px 20px rgba(15,60,110,.08)}
.header-inner{display:flex;align-items:center;gap:28px;height:72px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.logo:hover{text-decoration:none}
.logo-mark{
  width:38px;height:38px;border-radius:10px;flex-shrink:0;
  background:linear-gradient(140deg,var(--blue) 0%,var(--blue-dark) 100%);
  color:#fff;font-size:17px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(31,95,168,.28);
}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-main{font-size:17px;font-weight:700;color:var(--blue-dark);letter-spacing:.2px}
.logo-sub{font-size:11px;color:var(--muted);letter-spacing:1.6px;margin-top:2px}
.main-nav{display:flex;align-items:center;gap:6px;margin-left:8px}
.main-nav a{
  position:relative;
  display:inline-flex;align-items:center;
  height:40px;padding:0 14px;border-radius:var(--radius-sm);
  font-size:15px;color:#33475c;font-weight:500;
  transition:background .2s ease,color .2s ease;
}
.main-nav a::after{
  content:"";position:absolute;left:14px;right:14px;bottom:6px;height:2px;
  background:var(--blue);border-radius:2px;
  transform:scaleX(0);transform-origin:left;transition:transform .25s ease;
}
.main-nav a:hover{background:var(--blue-soft);color:var(--blue-dark);text-decoration:none}
.main-nav a:hover::after,.main-nav a.active::after{transform:scaleX(1)}
.main-nav a.active{color:var(--blue);font-weight:600;background:var(--blue-soft)}
.header-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.mega-toggle{
  display:inline-flex;align-items:center;gap:6px;
  height:40px;padding:0 14px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:#fff;color:var(--blue-dark);
  font-size:15px;font-weight:500;
  transition:border-color .2s ease,background .2s ease,color .2s ease;
}
.mega-toggle:hover{border-color:var(--blue-mid);background:var(--blue-soft);color:var(--blue)}
.mega-toggle .caret{transition:transform .25s ease;font-size:11px;color:var(--blue)}
.mega-toggle[aria-expanded="true"] .caret{transform:rotate(180deg)}
.nav-burger{
  display:none;width:44px;height:44px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:#fff;
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-burger span{display:block;width:18px;height:2px;background:var(--blue-dark);border-radius:2px;transition:transform .25s ease,opacity .25s ease}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:var(--radius-sm);border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;
  cursor:pointer;text-decoration:none;
  transition:background .22s ease,color .22s ease,border-color .22s ease,transform .18s ease,box-shadow .22s ease;
}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 6px 16px rgba(31,95,168,.22)}
.btn-primary:hover{background:#174a86;color:#fff;transform:translateY(-2px);box-shadow:0 10px 22px rgba(31,95,168,.28)}
.btn-primary:active{transform:translateY(0);background:#123c6e}
.btn-ghost{background:#fff;color:var(--blue);border-color:var(--blue-mid)}
.btn-ghost:hover{background:var(--blue-soft);color:var(--blue-dark);border-color:var(--blue)}
.btn-accent{background:var(--orange);color:#fff;box-shadow:0 6px 16px rgba(240,138,36,.28)}
.btn-accent:hover{background:var(--orange-dark);color:#fff;transform:translateY(-2px)}
.btn-accent:active{transform:translateY(0)}
.btn-sm{padding:11px 18px;font-size:14px}
.btn-block{width:100%}
.mega-panel{
  position:absolute;top:72px;right:0;left:0;
  background:transparent;pointer-events:none;
  opacity:0;transform:translateY(-8px);
  transition:opacity .2s ease,transform .2s ease;
}
.mega-panel.open{opacity:1;transform:translateY(0);pointer-events:auto}
.mega-inner{
  max-width:var(--max);margin:0 auto;padding:0 24px;
}
.mega-card{
  margin-left:auto;width:min(860px,100%);
  background:#fff;border:1px solid var(--border);border-radius:14px;
  box-shadow:var(--shadow-lg);
  padding:26px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:26px;
}
.mega-col h4{font-size:13px;color:var(--muted);font-weight:600;letter-spacing:1px;margin-bottom:12px;text-transform:uppercase}
.mega-col a,.mega-col .mega-post{
  display:block;padding:8px 10px;border-radius:var(--radius-sm);
  font-size:14px;color:#33475c;
  transition:background .2s ease,color .2s ease;
}
.mega-col a:hover{background:var(--blue-soft);color:var(--blue-dark);text-decoration:none}
.mega-col .mega-post:hover{background:var(--blue-soft);color:var(--blue-dark);text-decoration:none}
.mega-empty{font-size:13px;color:var(--muted);padding:8px 10px}
.mega-dl{
  background:var(--blue-soft);border:1px solid var(--blue-mid);border-radius:10px;
  padding:16px;
}
.mega-dl p{font-size:13px;color:var(--muted);margin-bottom:12px;line-height:1.6}

/* ============ Hero ============ */
.hero{
  position:relative;
  background-image:linear-gradient(105deg,rgba(15,60,110,.94) 0%,rgba(31,95,168,.86) 52%,rgba(31,95,168,.6) 100%),url(/assets/images/807948276310caba.jpg);
  background-size:cover;background-position:center;
  color:#fff;
  padding:76px 0 68px;
}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);
  color:#eaf2fd;font-size:13px;padding:6px 14px;border-radius:999px;
  margin-bottom:20px;letter-spacing:.6px;
}
.hero h1{color:#fff;font-size:42px;line-height:1.28;letter-spacing:-.5px}
.hero h1 em{font-style:normal;color:#ffd8a8}
.hero-lead{
  margin-top:20px;font-size:16px;line-height:1.9;color:rgba(255,255,255,.9);max-width:600px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero .btn-ghost{background:rgba(255,255,255,.1);color:#fff;border-color:rgba(255,255,255,.45)}
.hero .btn-ghost:hover{background:rgba(255,255,255,.2);color:#fff;border-color:#fff}
.hero-facts{
  display:flex;flex-wrap:wrap;gap:10px 26px;margin-top:30px;padding-top:22px;
  border-top:1px solid rgba(255,255,255,.22);
}
.hero-facts li{font-size:14px;color:rgba(255,255,255,.85);display:flex;align-items:center;gap:8px}
.hero-facts li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--orange);flex-shrink:0}
.hero-panel{
  background:rgba(255,255,255,.96);
  border-radius:var(--radius-lg);
  box-shadow:0 20px 50px rgba(6,32,64,.3);
  padding:26px;
  color:var(--text);
}
.hero-panel h2{font-size:17px;margin-bottom:6px;color:var(--blue-dark)}
.hero-panel .panel-sub{font-size:13px;color:var(--muted);margin-bottom:18px}
.panel-step{display:flex;gap:14px;padding:14px 0;border-bottom:1px dashed var(--border)}
.panel-step:last-of-type{border-bottom:none}
.panel-num{
  width:32px;height:32px;flex-shrink:0;border-radius:9px;
  background:var(--blue-soft);color:var(--blue);
  font-size:14px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.panel-step h3{font-size:15px;margin-bottom:2px}
.panel-step p{font-size:13px;color:var(--muted);line-height:1.65}
.panel-foot{
  margin-top:16px;padding-top:16px;border-top:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.panel-foot span{font-size:13px;color:var(--muted)}

/* ============ Sections ============ */
section{padding:var(--section-pad) 0}
.section-alt{background:#fff}
.section-soft{background:var(--blue-soft)}
.section-head{max-width:760px;margin-bottom:44px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--blue);
  background:var(--blue-soft);border-radius:999px;padding:5px 14px;
  margin-bottom:16px;letter-spacing:.4px;
}
.section-soft .eyebrow{background:#fff}
.section-head h2{margin-bottom:14px}
.section-head p{font-size:16px;color:var(--muted);line-height:1.85}
.section-rule{
  width:48px;height:4px;border-radius:2px;background:var(--blue);
  margin-bottom:18px;
}
.section-head.center .section-rule{margin-left:auto;margin-right:auto}

/* ============ 服务矩阵 ============ */
.matrix-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.matrix-card{
  position:relative;background:#fff;border:1px solid var(--border);
  border-radius:var(--radius);padding:26px 24px 22px;
  box-shadow:var(--shadow);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.matrix-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue-mid)}
.matrix-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.matrix-num{
  font-size:13px;font-weight:700;color:var(--blue);
  background:var(--blue-soft);border-radius:var(--radius-sm);
  padding:4px 10px;letter-spacing:1px;
}
.tag{
  display:inline-block;font-size:12px;line-height:1;
  padding:6px 10px;border-radius:999px;
  background:var(--blue-soft);color:var(--blue-dark);font-weight:600;
}
.tag-warm{background:rgba(240,138,36,.14);color:var(--orange-dark)}
.matrix-card h3{font-size:18px;margin-bottom:10px}
.matrix-card p{font-size:14px;color:var(--muted);line-height:1.8;min-height:76px}
.matrix-meta{
  margin-top:16px;padding-top:14px;border-top:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;
  font-size:13px;color:var(--muted);
}
.matrix-meta strong{color:var(--blue);font-weight:600}

/* ============ 数据条 ============ */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.stat-card{
  background:#fff;border:1px solid var(--blue-mid);border-radius:var(--radius);
  padding:26px 22px;box-shadow:var(--shadow);
  transition:transform .25s ease,box-shadow .25s ease;
}
.stat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.stat-num{font-size:32px;font-weight:700;color:var(--blue);line-height:1.2;letter-spacing:-.5px}
.stat-label{font-size:15px;font-weight:600;color:var(--blue-dark);margin-top:8px}
.stat-desc{font-size:13px;color:var(--muted);margin-top:6px;line-height:1.7}

/* ============ 下载区 ============ */
.download-band{
  background:linear-gradient(120deg,#123c6e 0%,#1f5fa8 100%);
  color:#fff;position:relative;overflow:hidden;
}
.download-band::after{
  content:"";position:absolute;width:420px;height:420px;border-radius:50%;
  background:rgba(255,255,255,.06);right:-120px;top:-160px;
}
.download-band .section-head h2{color:#fff}
.download-band .section-head p{color:rgba(255,255,255,.82)}
.download-band .eyebrow{background:rgba(255,255,255,.16);color:#fff}
.download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap);position:relative;z-index:1}
.download-card{
  background:rgba(255,255,255,.97);border-radius:var(--radius);
  padding:26px 24px;color:var(--text);
  box-shadow:0 14px 34px rgba(6,32,64,.22);
  transition:transform .25s ease,box-shadow .25s ease;
  display:flex;flex-direction:column;
}
.download-card:hover{transform:translateY(-5px);box-shadow:0 20px 44px rgba(6,32,64,.3)}
.device-icon{
  width:52px;height:52px;border-radius:12px;
  background:var(--blue-soft);color:var(--blue);
  display:flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:700;letter-spacing:.5px;margin-bottom:16px;
}
.download-card h3{font-size:18px;margin-bottom:8px}
.download-card p{font-size:14px;color:var(--muted);line-height:1.75;margin-bottom:18px;flex:1}
.download-note{
  margin-top:26px;font-size:13px;color:rgba(255,255,255,.78);
  text-align:center;position:relative;z-index:1;
}

/* ============ 流程 ============ */
.flow-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap);position:relative}
.flow-grid::before{
  content:"";position:absolute;top:26px;left:8%;right:8%;height:2px;
  background:repeating-linear-gradient(90deg,var(--blue-mid) 0 10px,transparent 10px 20px);
}
.flow-item{position:relative;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px 22px 22px;box-shadow:var(--shadow);transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}
.flow-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--blue-mid)}
.flow-num{
  width:52px;height:52px;border-radius:50%;background:var(--blue);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:700;margin-bottom:16px;
  box-shadow:0 8px 18px rgba(31,95,168,.28);
}
.flow-item h3{font-size:17px;margin-bottom:8px}
.flow-item p{font-size:14px;color:var(--muted);line-height:1.8}

/* ============ 案例墙 ============ */
.case-grid{
  display:grid;grid-template-columns:repeat(4,1fr);
  grid-auto-rows:auto;gap:var(--gap);
}
.case-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
  display:flex;flex-direction:column;
}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue-mid)}
.case-card.wide{grid-column:span 2}
.case-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--blue-soft)}
.case-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.case-card:hover .case-thumb img{transform:scale(1.04)}
.case-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.case-body h3{font-size:17px}
.case-body p{font-size:14px;color:var(--muted);line-height:1.75}
.case-loc{font-size:12px;color:var(--blue);background:var(--blue-soft);border-radius:999px;padding:4px 10px;align-self:flex-start}

/* ============ 资讯列表 ============ */
.news-layout{display:grid;grid-template-columns:1.55fr .85fr;gap:36px;align-items:start}
.news-list{display:flex;flex-direction:column;gap:16px}
.news-item{
  display:grid;grid-template-columns:1fr auto;gap:22px;align-items:start;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:22px 24px;box-shadow:var(--shadow);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.news-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--blue-mid)}
.news-item h3{font-size:17px;margin-bottom:8px}
.news-item h3 a{color:var(--blue-dark)}
.news-item h3 a:hover{color:var(--blue)}
.news-item p{font-size:14px;color:var(--muted);line-height:1.75}
.news-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:12px;font-size:13px;color:var(--muted)}
.news-right{display:flex;flex-direction:column;align-items:flex-end;gap:8px;font-size:13px;color:var(--muted);white-space:nowrap}
.news-aside{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.news-aside h3{font-size:16px;margin-bottom:14px}
.aside-link{
  display:block;padding:12px 0;border-bottom:1px dashed var(--border);
  font-size:14px;color:#33475c;line-height:1.6;transition:color .2s ease;
}
.aside-link:last-child{border-bottom:none}
.aside-link:hover{color:var(--blue);text-decoration:none}
.empty-state{
  background:#fff;border:1px dashed var(--blue-mid);border-radius:var(--radius);
  padding:44px 24px;text-align:center;color:var(--muted);font-size:15px;
}
.empty-state .empty-icon{
  width:52px;height:52px;border-radius:50%;background:var(--blue-soft);
  margin:0 auto 14px;display:flex;align-items:center;justify-content:center;
  color:var(--blue);font-size:20px;font-weight:700;
}

/* ============ 专题 / 场景 / 索引 ============ */
.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.topic-card{
  display:block;background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);color:inherit;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.topic-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--blue-mid);text-decoration:none}
.topic-card h3{font-size:17px;margin:14px 0 8px}
.topic-card p{font-size:14px;color:var(--muted);line-height:1.75}
.topic-mark{
  width:44px;height:44px;border-radius:11px;background:var(--blue-soft);color:var(--blue);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;
}
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.scene-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow);display:flex;gap:16px;align-items:flex-start;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.scene-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--blue-mid)}
.scene-ico{
  width:44px;height:44px;flex-shrink:0;border-radius:11px;
  background:linear-gradient(140deg,var(--blue) 0%,#2d7bc9 100%);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:700;
}
.scene-card h3{font-size:16px;margin-bottom:6px}
.scene-card p{font-size:14px;color:var(--muted);line-height:1.7}
.region-cloud{display:flex;flex-wrap:wrap;gap:10px}
.region-cloud span,.region-cloud a{
  display:inline-block;font-size:14px;color:#33475c;
  background:#fff;border:1px solid var(--border);border-radius:999px;
  padding:8px 16px;transition:all .2s ease;
}
.region-cloud a:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-soft);text-decoration:none}
.keyword-cloud{display:flex;flex-wrap:wrap;gap:10px}
.keyword-cloud a{
  display:inline-block;font-size:14px;color:var(--blue-dark);
  background:var(--blue-soft);border:1px solid var(--blue-mid);border-radius:999px;
  padding:8px 16px;transition:all .2s ease;
}
.keyword-cloud a:hover{background:var(--blue);color:#fff;border-color:var(--blue);text-decoration:none}

/* ============ 合作伙伴 ============ */
.partner-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.partner-card{
  background:#fff;border:1px dashed var(--blue-mid);border-radius:var(--radius);
  padding:26px 22px;text-align:center;
  transition:border-color .25s ease,background .25s ease;
}
.partner-card:hover{border-color:var(--blue);background:#fbfdff}
.partner-card strong{display:block;font-size:16px;color:var(--blue-dark);margin-bottom:6px}
.partner-card span{font-size:13px;color:var(--muted);line-height:1.7;display:block}

/* ============ FAQ ============ */
.faq-list{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;transition:border-color .25s ease,box-shadow .25s ease;
}
.faq-item.open{border-color:var(--blue-mid);box-shadow:var(--shadow-md)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:20px 24px;background:transparent;border:none;text-align:left;
  font-size:16px;font-weight:600;color:var(--blue-dark);line-height:1.6;
  transition:background .2s ease,color .2s ease;
}
.faq-q:hover{background:var(--blue-soft);color:var(--blue)}
.faq-icon{
  width:22px;height:22px;flex-shrink:0;position:relative;
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--blue);border-radius:2px;
  transition:transform .25s ease,opacity .25s ease;
}
.faq-icon::before{left:4px;right:4px;top:10px;height:2px}
.faq-icon::after{top:4px;bottom:4px;left:10px;width:2px}
.faq-item.open .faq-icon::after{transform:scaleY(0);opacity:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease}
.faq-a p{padding:0 24px 22px;font-size:15px;color:var(--muted);line-height:1.85}

/* ============ 保障条 ============ */
.guard-band{background:var(--blue-soft);padding:30px 0}
.guard-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.guard-item{display:flex;align-items:flex-start;gap:12px;font-size:14px;color:var(--blue-dark);line-height:1.7}
.guard-item::before{
  content:"";width:8px;height:8px;border-radius:50%;background:var(--orange);
  margin-top:9px;flex-shrink:0;
}

/* ============ 更新时间线 ============ */
.timeline{max-width:820px;margin:0 auto;position:relative;padding-left:28px}
.timeline::before{
  content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;
  background:linear-gradient(180deg,var(--blue-mid),transparent);
}
.timeline-item{position:relative;padding:0 0 26px 8px}
.timeline-item:last-child{padding-bottom:0}
.timeline-item::before{
  content:"";position:absolute;left:-28px;top:8px;width:12px;height:12px;border-radius:50%;
  background:#fff;border:3px solid var(--blue);
}
.timeline-item h3{font-size:16px;margin-bottom:6px}
.timeline-item p{font-size:14px;color:var(--muted);line-height:1.8}

/* ============ 联系表单 ============ */
.contact-wrap{
  display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;
}
.contact-info h2{margin-bottom:16px}
.contact-info p{font-size:15px;color:var(--muted);line-height:1.85;margin-bottom:18px}
.contact-points{display:flex;flex-direction:column;gap:12px}
.contact-points li{
  display:flex;gap:12px;font-size:14px;color:#33475c;line-height:1.7;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:14px 16px;box-shadow:var(--shadow);
}
.contact-points li b{color:var(--blue);font-weight:600;flex-shrink:0}
.contact-form{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:30px;box-shadow:var(--shadow-md);
}
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;font-weight:600;color:var(--blue-dark);margin-bottom:8px}
.field input,.field textarea,.field select{
  width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:10px;
  background:#fbfdff;color:var(--text);line-height:1.6;
  transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
}
.field input:hover,.field textarea:hover,.field select:hover{border-color:var(--blue-mid)}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--blue);background:#fff;
  box-shadow:0 0 0 3px rgba(31,95,168,.14);
}
.field textarea{resize:vertical;min-height:110px}
.form-hint{font-size:12px;color:var(--muted);margin-top:12px;line-height:1.7}

/* ============ Footer ============ */
.site-footer{background:#0d2f56;color:#c9d9ea;padding:64px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr .8fr .8fr 1fr;gap:36px;padding-bottom:40px}
.footer-brand h3{color:#fff;font-size:18px;margin-bottom:12px}
.footer-brand p{font-size:14px;line-height:1.85;color:#a7c0da;max-width:340px}
.footer-col h4{font-size:14px;color:#fff;margin-bottom:14px;letter-spacing:.5px}
.footer-col a,.footer-col span{display:block;font-size:14px;color:#a7c0da;padding:5px 0;transition:color .2s ease}
.footer-col a:hover{color:#fff;text-decoration:none}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);
  padding:20px 0;display:flex;flex-wrap:wrap;gap:12px;
  align-items:center;justify-content:space-between;
  font-size:13px;color:#8aa7c4;
}
.footer-bottom a{color:#a7c0da}
.footer-bottom a:hover{color:#fff;text-decoration:none}

/* ============ Responsive ============ */
@media (max-width:1199px){
  .container{padding:0 20px}
  .mega-inner{padding:0 20px}
  .hero h1{font-size:36px}
  .matrix-grid{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:1024px){
  :root{--section-pad:70px}
  .main-nav a{padding:0 10px;font-size:14px}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero h1{font-size:34px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .flow-grid{grid-template-columns:repeat(2,1fr)}
  .flow-grid::before{display:none}
  .topic-grid{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .case-card.wide{grid-column:span 2}
  .news-layout{grid-template-columns:1fr}
  .contact-wrap{grid-template-columns:1fr;gap:32px}
  .partner-grid{grid-template-columns:repeat(2,1fr)}
  .guard-grid{grid-template-columns:repeat(2,1fr)}
  .scene-grid{grid-template-columns:repeat(2,1fr)}
  .download-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:860px){
  .nav-burger{display:flex}
  .main-nav{
    position:absolute;top:72px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;
    background:#fff;border-bottom:1px solid var(--border);
    box-shadow:0 16px 30px rgba(15,60,110,.12);
    padding:12px 20px 20px;margin:0;
    max-height:0;overflow:hidden;opacity:0;pointer-events:none;
    transition:max-height .3s ease,opacity .25s ease,padding .25s ease;
  }
  .main-nav.open{max-height:400px;opacity:1;pointer-events:auto}
  .main-nav a{height:46px;border-radius:10px;padding:0 14px}
  .main-nav a::after{display:none}
  .mega-toggle{display:none}
  .header-actions .btn-sm{padding:11px 14px;font-size:13px}
  .mega-panel{display:none}
  .matrix-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:30px}
  .section-head h2{font-size:24px}
}
@media (max-width:640px){
  :root{--section-pad:54px;--gap:16px}
  h1{font-size:26px}
  h2{font-size:22px}
  .container{padding:0 18px}
  .header-inner{height:64px;gap:12px}
  .logo-mark{width:34px;height:34px;font-size:15px}
  .logo-main{font-size:15px}
  .logo-sub{font-size:10px;letter-spacing:1px}
  .header-actions .btn-sm{padding:10px 12px;font-size:13px}
  .site-header{position:relative}
  .main-nav{top:64px}
  .hero{padding:52px 0 48px}
  .hero h1{font-size:25px;line-height:1.35}
  .hero-lead{font-size:15px}
  .hero-actions .btn{width:100%}
  .hero-facts{gap:8px 18px}
  .hero-facts li{font-size:13px}
  .hero-panel{padding:20px}
  .matrix-grid,.stats-grid,.flow-grid,.case-grid,.topic-grid,.scene-grid,.partner-grid,.download-grid,.footer-grid,.guard-grid{grid-template-columns:1fr}
  .case-card.wide{grid-column:span 1}
  .news-item{grid-template-columns:1fr;gap:10px}
  .news-right{flex-direction:row;align-items:center;justify-content:flex-start}
  .contact-form{padding:22px}
  .faq-q{font-size:15px;padding:16px 18px}
  .faq-a p{padding:0 18px 18px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .btn{width:100%}
  .header-actions .btn{width:auto}
}

/* roulang page: category1 */
:root{
  --blue:#1f5fa8;
  --blue-dark:#0f3c6e;
  --blue-soft:#e8f0fb;
  --blue-mid:#c9dcf3;
  --orange:#f08a24;
  --orange-dark:#d9740f;
  --bg:#f7fafd;
  --white:#ffffff;
  --text:#1d2b3a;
  --muted:#5d7186;
  --border:#e3ebf5;
  --radius:12px;
  --radius-sm:8px;
  --radius-lg:16px;
  --shadow:0 6px 20px rgba(31,95,168,.07);
  --shadow-md:0 10px 28px rgba(31,95,168,.11);
  --shadow-lg:0 14px 34px rgba(31,95,168,.14);
  --max:1200px;
  --gap:24px;
  --section-pad:88px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--blue);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--blue-dark)}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;line-height:1.35;color:var(--blue-dark)}
button{font-family:inherit;cursor:pointer}
input,textarea,select{font-family:inherit;font-size:15px}
.container{max-width:var(--max);margin:0 auto;padding:0 24px;width:100%}
/* ===== Header / Nav ===== */
.site-header{
  position:sticky;top:0;z-index:200;
  background:#fff;border-bottom:1px solid var(--border);
  transition:box-shadow .25s ease;
}
.site-header.scrolled{box-shadow:0 6px 20px rgba(15,60,110,.08)}
.header-inner{display:flex;align-items:center;gap:28px;height:72px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.logo-mark{
  width:38px;height:38px;border-radius:10px;flex-shrink:0;
  background:linear-gradient(140deg,var(--blue) 0%,var(--blue-dark) 100%);
  color:#fff;font-size:17px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(31,95,168,.28);
}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-main{font-size:17px;font-weight:700;color:var(--blue-dark);letter-spacing:.2px}
.logo-sub{font-size:11px;color:var(--muted);letter-spacing:1.6px;margin-top:2px}
.main-nav{display:flex;align-items:center;gap:6px;margin-left:8px}
.main-nav a{
  position:relative;display:inline-flex;align-items:center;
  height:40px;padding:0 14px;border-radius:var(--radius-sm);
  font-size:15px;color:#33475c;font-weight:500;
  transition:background .2s ease,color .2s ease;
}
.main-nav a::after{
  content:"";position:absolute;left:14px;right:14px;bottom:6px;height:2px;
  background:var(--blue);border-radius:2px;
  transform:scaleX(0);transform-origin:left;transition:transform .25s ease;
}
.main-nav a:hover{background:var(--blue-soft);color:var(--blue-dark)}
.main-nav a:hover::after,.main-nav a.active::after{transform:scaleX(1)}
.main-nav a.active{color:var(--blue);font-weight:600;background:var(--blue-soft)}
.header-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.mega-toggle{
  display:inline-flex;align-items:center;gap:6px;
  height:40px;padding:0 14px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:#fff;color:var(--blue-dark);
  font-size:15px;font-weight:500;
  transition:border-color .2s ease,background .2s ease,color .2s ease;
}
.mega-toggle:hover{border-color:var(--blue-mid);background:var(--blue-soft);color:var(--blue)}
.mega-toggle .caret{transition:transform .25s ease;font-size:11px;color:var(--blue)}
.mega-toggle[aria-expanded="true"] .caret{transform:rotate(180deg)}
.nav-burger{
  display:none;width:44px;height:44px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:#fff;
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-burger span{display:block;width:18px;height:2px;background:var(--blue-dark);border-radius:2px;transition:transform .25s ease,opacity .25s ease}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:var(--radius-sm);border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;cursor:pointer;text-decoration:none;
  transition:background .22s ease,color .22s ease,border-color .22s ease,transform .18s ease,box-shadow .22s ease;
}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 6px 16px rgba(31,95,168,.22)}
.btn-primary:hover{background:#174a86;color:#fff;transform:translateY(-2px);box-shadow:0 10px 22px rgba(31,95,168,.28)}
.btn-primary:active{transform:translateY(0);background:#123c6e}
.btn-ghost{background:#fff;color:var(--blue);border-color:var(--blue-mid)}
.btn-ghost:hover{background:var(--blue-soft);color:var(--blue-dark);border-color:var(--blue)}
.btn-accent{background:var(--orange);color:#fff;box-shadow:0 6px 16px rgba(240,138,36,.28)}
.btn-accent:hover{background:var(--orange-dark);color:#fff;transform:translateY(-2px)}
.btn-accent:active{transform:translateY(0)}
.btn-sm{padding:11px 18px;font-size:14px}
.btn-block{width:100%}
.btn:focus-visible,.main-nav a:focus-visible,.mega-toggle:focus-visible,.nav-burger:focus-visible,.faq-q:focus-visible{
  outline:2px solid var(--orange);outline-offset:2px;
}
.mega-panel{
  position:absolute;top:72px;right:0;left:0;
  background:transparent;pointer-events:none;
  opacity:0;transform:translateY(-8px);
  transition:opacity .2s ease,transform .2s ease;
}
.mega-panel.open{opacity:1;transform:translateY(0);pointer-events:auto}
.mega-inner{max-width:var(--max);margin:0 auto;padding:0 24px}
.mega-card{
  margin-left:auto;width:min(860px,100%);
  background:#fff;border:1px solid var(--border);border-radius:14px;
  box-shadow:var(--shadow-lg);padding:26px;
  display:grid;grid-template-columns:1fr 1fr 1fr;gap:26px;
}
.mega-col h4{font-size:13px;color:var(--muted);font-weight:600;letter-spacing:1px;margin-bottom:12px}
.mega-col a,.mega-col .mega-post{
  display:block;padding:8px 10px;border-radius:var(--radius-sm);
  font-size:14px;color:#33475c;
  transition:background .2s ease,color .2s ease;
}
.mega-col a:hover,.mega-col .mega-post:hover{background:var(--blue-soft);color:var(--blue-dark)}
.mega-empty{font-size:13px;color:var(--muted);padding:8px 10px;margin:0}
.mega-dl{background:var(--blue-soft);border:1px solid var(--blue-mid);border-radius:10px;padding:16px}
.mega-dl p{font-size:13px;color:var(--muted);margin:0 0 12px;line-height:1.7}
/* ===== Section base ===== */
.section{padding:var(--section-pad) 0}
.section-alt{background:var(--white)}
.section-head{max-width:760px;margin-bottom:36px}
.section-head .eyebrow{
  display:inline-block;font-size:13px;font-weight:600;color:var(--blue);
  background:var(--blue-soft);border-radius:999px;padding:5px 14px;margin-bottom:14px;
}
.section-head h2{font-size:30px;margin-bottom:12px}
.section-head p{color:var(--muted);font-size:15px;margin:0}
.tag{
  display:inline-flex;align-items:center;
  padding:3px 11px;border-radius:999px;
  background:var(--blue-soft);color:var(--blue-dark);
  font-size:12px;font-weight:600;line-height:1.9;
}
.tag-accent{background:#fdeed9;color:var(--orange-dark)}
/* ===== 分类页头 ===== */
.cat-hero{
  background:linear-gradient(120deg,#eef5fd 0%,#e2edfa 60%,#dbe9f9 100%);
  border-bottom:1px solid var(--border);
  padding:30px 0 34px;
}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--muted);margin-bottom:16px}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb span.sep{color:#a9bdd4}
.cat-hero-grid{display:grid;grid-template-columns:1fr 300px;gap:34px;align-items:start}
.cat-hero h1{font-size:34px;line-height:1.35;margin-bottom:12px;letter-spacing:.2px}
.cat-hero .lead{color:#3d5670;font-size:16px;max-width:680px;margin:0}
.cat-stat{
  background:#fff;border:1px solid var(--blue-mid);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:20px 22px;
}
.cat-stat h2{font-size:13px;letter-spacing:1px;color:var(--muted);font-weight:600;margin-bottom:12px}
.stat-row{display:flex;justify-content:space-between;gap:14px;padding:9px 0;border-bottom:1px dashed var(--border);font-size:14px}
.stat-row:last-child{border-bottom:0;padding-bottom:0}
.stat-row dt{color:var(--muted);margin:0}
.stat-row dd{margin:0;color:var(--blue-dark);font-weight:600;text-align:right}
/* ===== 分类导航条 ===== */
.cat-tabs-band{background:#fff;border-bottom:1px solid var(--border);padding:16px 0}
.cat-tabs{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.cat-tabs a{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 18px;border-radius:999px;
  border:1px solid var(--border);background:#fff;
  font-size:14px;font-weight:600;color:#33475c;
  transition:all .22s ease;
}
.cat-tabs a:hover{border-color:var(--blue-mid);background:var(--blue-soft);color:var(--blue-dark)}
.cat-tabs a.active{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 6px 16px rgba(31,95,168,.22)}
.cat-tabs-note{font-size:13px;color:var(--muted);margin:10px 0 0}
/* ===== 收录口径 ===== */
.scope-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.scope-text h2{font-size:28px;margin-bottom:16px}
.scope-text p{color:#40566d;font-size:15.5px}
.field-list{display:grid;gap:14px;margin-top:22px}
.field-item{display:flex;gap:14px;padding:16px 18px;background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}
.field-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--blue-mid)}
.field-icon{
  width:34px;height:34px;flex-shrink:0;border-radius:9px;
  background:var(--blue-soft);color:var(--blue);font-size:15px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.field-item strong{display:block;font-size:15px;color:var(--blue-dark);margin-bottom:3px}
.field-item p{margin:0;font-size:14px;color:var(--muted);line-height:1.7}
.scope-figure{margin:0}
.scope-figure img{width:100%;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--border)}
.scope-figure figcaption{font-size:13px;color:var(--muted);margin-top:12px;text-align:center}
/* ===== 场景卡片 ===== */
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.scene-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow);position:relative;overflow:hidden;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.scene-card::before{
  content:"";position:absolute;left:0;top:0;height:3px;width:0;
  background:var(--orange);transition:width .3s ease;
}
.scene-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue-mid)}
.scene-card:hover::before{width:100%}
.scene-num{font-size:13px;font-weight:700;color:var(--blue-mid);letter-spacing:1px}
.scene-card h3{font-size:18px;margin:8px 0 10px}
.scene-card p{font-size:14.5px;color:var(--muted);margin:0 0 14px;line-height:1.75}
/* ===== 列表主体 ===== */
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.post-card{
  display:flex;flex-direction:column;gap:12px;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.post-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue-mid)}
.post-meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;font-size:13px;color:var(--muted)}
.post-card h3{font-size:17.5px;line-height:1.55;margin:0}
.post-card h3 a{color:var(--blue-dark)}
.post-card h3 a:hover{color:var(--blue)}
.post-excerpt{font-size:14px;color:var(--muted);line-height:1.75;margin:0}
.post-link{margin-top:auto;font-size:14px;font-weight:600;color:var(--blue);display:inline-flex;align-items:center;gap:6px}
.post-link:hover{color:var(--blue-dark)}
.post-link::after{content:"→";transition:transform .2s ease}
.post-link:hover::after{transform:translateX(3px)}
.list-foot{display:flex;justify-content:center;margin-top:36px}
.empty-state{
  grid-column:1/-1;text-align:center;color:var(--muted);font-size:15px;
  background:#fff;border:1px dashed var(--blue-mid);border-radius:var(--radius);
  padding:44px 24px;
}
/* ===== 热门条目 ===== */
.hot-list{display:grid;gap:14px}
.hot-item{
  display:flex;align-items:flex-start;gap:18px;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:20px 24px;box-shadow:var(--shadow);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.hot-item:hover{transform:translateX(4px);box-shadow:var(--shadow-md);border-color:var(--blue-mid)}
.hot-num{
  font-size:15px;font-weight:700;color:var(--blue);
  background:var(--blue-soft);border-radius:9px;
  width:36px;height:36px;flex-shrink:0;display:flex;align-items:center;justify-content:center;
}
.hot-body h3{font-size:16.5px;margin:0 0 6px}
.hot-body h3 a{color:var(--blue-dark)}
.hot-body h3 a:hover{color:var(--blue)}
.hot-body p{margin:0;font-size:14px;color:var(--muted);line-height:1.7}
/* ===== 专题卡 ===== */
.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.topic-card{
  display:flex;flex-direction:column;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.topic-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue-mid)}
.topic-card img{width:100%;aspect-ratio:4/3;object-fit:cover}
.topic-body{padding:18px 20px 22px}
.topic-body h3{font-size:16px;margin-bottom:8px}
.topic-body p{font-size:13.5px;color:var(--muted);margin:0;line-height:1.7}
/* ===== FAQ ===== */
.faq-wrap{max-width:880px;margin:0 auto}
.faq-item{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;margin-bottom:12px;
  transition:border-color .25s ease,box-shadow .25s ease;
}
.faq-item:hover{border-color:var(--blue-mid)}
.faq-item.open{border-color:var(--blue-mid);box-shadow:var(--shadow-md)}
.faq-q{
  width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:18px 22px;background:#fff;border:0;text-align:left;
  font-size:16px;font-weight:600;color:var(--blue-dark);line-height:1.6;
}
.faq-q .arrow{
  flex-shrink:0;width:22px;height:22px;border-radius:50%;
  background:var(--blue-soft);color:var(--blue);font-size:12px;
  display:flex;align-items:center;justify-content:center;
  transition:transform .25s ease,background .25s ease,color .25s ease;
}
.faq-item.open .faq-q .arrow{transform:rotate(180deg);background:var(--blue);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease,padding .28s ease;padding:0 22px}
.faq-a p{margin:0;font-size:14.5px;color:#42586e;line-height:1.85}
.faq-item.open .faq-a{padding:0 22px 20px}
/* ===== 下载条 ===== */
.dl-band{background:linear-gradient(120deg,#eef5fd 0%,#e6f0fb 100%);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.dl-head{max-width:720px;margin-bottom:30px}
.dl-head h2{font-size:28px;margin-bottom:10px}
.dl-head p{color:var(--muted);font-size:15px;margin:0}
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.dl-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:14px;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.dl-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue-mid)}
.dl-icon{
  width:48px;height:48px;border-radius:12px;background:var(--blue-soft);
  color:var(--blue);font-size:18px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.dl-card h3{font-size:18px;margin:0}
.dl-card p{font-size:14px;color:var(--muted);margin:0;line-height:1.75}
.dl-note{font-size:13px;color:var(--muted);margin-top:22px}
/* ===== 结尾 CTA ===== */
.cta-band{
  background:linear-gradient(120deg,var(--blue-dark) 0%,var(--blue) 100%);
  border-radius:var(--radius-lg);
  padding:52px 44px;display:grid;grid-template-columns:1fr auto;gap:32px;align-items:center;
  box-shadow:var(--shadow-lg);
}
.cta-band h2{color:#fff;font-size:28px;margin-bottom:10px}
.cta-band p{color:#cfe0f4;margin:0;font-size:15px;max-width:640px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}
.cta-band .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.14);color:#fff;border-color:#fff}
/* ===== Footer ===== */
.site-footer{background:var(--blue-dark);color:#c7d8ec;padding:62px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.1fr;gap:36px;padding-bottom:44px}
.footer-brand h3{color:#fff;font-size:19px;margin-bottom:14px}
.footer-brand p{font-size:14px;line-height:1.85;color:#a9c3de;margin:0}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:14px;letter-spacing:.4px}
.footer-col a,.footer-col span{display:block;font-size:14px;color:#a9c3de;padding:6px 0;transition:color .2s ease}
.footer-col a:hover{color:#fff;text-decoration:underline}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.14);
  padding:20px 0;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13px;color:#93aecd;
}
/* ===== Responsive ===== */
@media (max-width:1100px){
  .cat-hero-grid{grid-template-columns:1fr;gap:24px}
  .cat-stat{max-width:420px}
  .scope-grid{grid-template-columns:1fr;gap:30px}
  .topic-grid{grid-template-columns:repeat(2,1fr)}
  .cta-band{grid-template-columns:1fr;padding:40px 30px}
}
@media (max-width:1024px){
  :root{--section-pad:64px}
  .main-nav{
    position:absolute;top:72px;left:0;right:0;z-index:150;
    flex-direction:column;align-items:stretch;gap:2px;margin:0;
    background:#fff;border-bottom:1px solid var(--border);
    box-shadow:var(--shadow-md);padding:12px 24px 18px;display:none;
  }
  .main-nav.open{display:flex}
  .main-nav a{height:44px;padding:0 12px}
  .main-nav a::after{display:none}
  .nav-burger{display:flex}
  .mega-toggle{display:none}
  .mega-panel{display:none}
  .scene-grid,.post-grid,.dl-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:768px){
  :root{--section-pad:52px;--gap:16px}
  .container{padding:0 18px}
  .header-inner{gap:14px;height:64px}
  .site-header .mega-panel,.main-nav{top:64px}
  .logo-main{font-size:15px}
  .logo-sub{font-size:10px;letter-spacing:1px}
  .cat-hero h1{font-size:26px}
  .cat-hero .lead{font-size:15px}
  .section-head h2{font-size:23px}
  .scope-text h2{font-size:22px}
  .dl-head h2{font-size:22px}
  .cta-band h2{font-size:22px}
  .scene-grid,.post-grid,.dl-grid,.topic-grid{grid-template-columns:1fr}
  .hot-item{padding:18px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-bottom{flex-direction:column;gap:6px}
}
@media (max-width:520px){
  .header-actions .btn-accent{display:none}
  .cat-hero{padding:22px 0 26px}
  .cat-hero h1{font-size:23px}
  .btn{width:100%;padding:13px 18px}
  .cta-actions{width:100%}
  .logo-sub{display:none}
  .breadcrumb{font-size:12px}
}

/* roulang page: article */
:root{
  --blue:#1f5fa8;
  --blue-dark:#0f3c6e;
  --blue-soft:#e8f0fb;
  --blue-mid:#c9dcf3;
  --orange:#f08a24;
  --orange-dark:#d9740f;
  --bg:#f7fafd;
  --white:#ffffff;
  --text:#1d2b3a;
  --muted:#5d7186;
  --border:#e3ebf5;
  --radius:12px;
  --radius-sm:8px;
  --radius-lg:16px;
  --shadow:0 6px 20px rgba(31,95,168,.07);
  --shadow-md:0 10px 28px rgba(31,95,168,.11);
  --shadow-lg:0 14px 34px rgba(31,95,168,.14);
  --max:1200px;
  --gap:24px;
  --section-pad:88px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--blue);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--blue-dark);text-decoration:underline}
button{font-family:inherit;cursor:pointer}
input,textarea,select{font-family:inherit;font-size:15px}
h1,h2,h3,h4{margin:0}
p{margin:0}
ul,ol{margin:0;padding:0}
:focus-visible{outline:2px solid var(--orange);outline-offset:2px}
.container{max-width:var(--max);margin:0 auto;padding:0 24px;width:100%}

/* ============ Header / Nav ============ */
.site-header{
  position:sticky;top:0;z-index:200;
  background:#fff;
  border-bottom:1px solid var(--border);
  transition:box-shadow .25s ease;
}
.site-header.scrolled{box-shadow:0 6px 20px rgba(15,60,110,.08)}
.header-inner{display:flex;align-items:center;gap:28px;height:72px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.logo:hover{text-decoration:none}
.logo-mark{
  width:38px;height:38px;border-radius:10px;flex-shrink:0;
  background:linear-gradient(140deg,var(--blue) 0%,var(--blue-dark) 100%);
  color:#fff;font-size:17px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(31,95,168,.28);
}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-main{font-size:17px;font-weight:700;color:var(--blue-dark);letter-spacing:.2px}
.logo-sub{font-size:11px;color:var(--muted);letter-spacing:1.6px;margin-top:2px}
.main-nav{display:flex;align-items:center;gap:6px;margin-left:8px}
.main-nav a{
  position:relative;
  display:inline-flex;align-items:center;
  height:40px;padding:0 14px;border-radius:var(--radius-sm);
  font-size:15px;color:#33475c;font-weight:500;
  transition:background .2s ease,color .2s ease;
}
.main-nav a::after{
  content:"";position:absolute;left:14px;right:14px;bottom:6px;height:2px;
  background:var(--blue);border-radius:2px;
  transform:scaleX(0);transform-origin:left;transition:transform .25s ease;
}
.main-nav a:hover{background:var(--blue-soft);color:var(--blue-dark);text-decoration:none}
.main-nav a:hover::after,.main-nav a.active::after{transform:scaleX(1)}
.main-nav a.active{color:var(--blue);font-weight:600;background:var(--blue-soft)}
.header-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.mega-toggle{
  display:inline-flex;align-items:center;gap:6px;
  height:40px;padding:0 14px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:#fff;color:var(--blue-dark);
  font-size:15px;font-weight:500;
  transition:border-color .2s ease,background .2s ease,color .2s ease;
}
.mega-toggle:hover{border-color:var(--blue-mid);background:var(--blue-soft);color:var(--blue)}
.mega-toggle .caret{transition:transform .25s ease;font-size:11px;color:var(--blue)}
.mega-toggle[aria-expanded="true"] .caret{transform:rotate(180deg)}
.nav-burger{
  display:none;width:44px;height:44px;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:#fff;
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-burger span{display:block;width:18px;height:2px;background:var(--blue-dark);border-radius:2px;transition:transform .25s ease,opacity .25s ease}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ============ Buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:var(--radius-sm);border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;
  cursor:pointer;text-decoration:none;
  transition:background .22s ease,color .22s ease,border-color .22s ease,transform .18s ease,box-shadow .22s ease;
}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 6px 16px rgba(31,95,168,.22)}
.btn-primary:hover{background:#174a86;color:#fff;transform:translateY(-2px);box-shadow:0 10px 22px rgba(31,95,168,.28)}
.btn-primary:active{transform:translateY(0);background:#123c6e}
.btn-ghost{background:#fff;color:var(--blue);border-color:var(--blue-mid)}
.btn-ghost:hover{background:var(--blue-soft);color:var(--blue-dark);border-color:var(--blue)}
.btn-accent{background:var(--orange);color:#fff;box-shadow:0 6px 16px rgba(240,138,36,.28)}
.btn-accent:hover{background:var(--orange-dark);color:#fff;transform:translateY(-2px)}
.btn-accent:active{transform:translateY(0)}
.btn-sm{padding:11px 18px;font-size:14px}
.btn-block{width:100%}

/* ============ Mega panel ============ */
.mega-panel{
  position:absolute;top:72px;right:0;left:0;
  background:transparent;pointer-events:none;
  opacity:0;transform:translateY(-8px);
  transition:opacity .2s ease,transform .2s ease;
}
.mega-panel.open{opacity:1;transform:translateY(0);pointer-events:auto}
.mega-inner{max-width:var(--max);margin:0 auto;padding:0 24px}
.mega-card{
  margin-left:auto;width:min(860px,100%);
  background:#fff;border:1px solid var(--border);border-radius:14px;
  box-shadow:var(--shadow-lg);
  padding:26px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:26px;
}
.mega-col h4{font-size:13px;color:var(--muted);font-weight:600;letter-spacing:1px;margin:0 0 12px}
.mega-col a,.mega-col .mega-post{
  display:block;padding:8px 10px;border-radius:var(--radius-sm);
  font-size:14px;color:#33475c;
  transition:background .2s ease,color .2s ease;
}
.mega-col a:hover,.mega-col .mega-post:hover{background:var(--blue-soft);color:var(--blue-dark);text-decoration:none}
.mega-empty{font-size:13px;color:var(--muted);padding:8px 10px}
.mega-dl{background:var(--blue-soft);border:1px solid var(--blue-mid);border-radius:10px;padding:16px}
.mega-dl p{font-size:13px;color:var(--muted);line-height:1.7;margin:0 0 12px}

/* ============ Article header band ============ */
.article-hero{
  background:linear-gradient(180deg,#eef4fd 0%,#f7fafd 100%);
  border-bottom:1px solid var(--border);
  padding:34px 0 38px;
}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:16px}
.breadcrumb a{color:var(--blue);font-weight:500}
.breadcrumb .sep{color:#b9cbe0}
.breadcrumb .current{color:var(--muted);max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.article-hero h1{
  font-size:clamp(23px,3vw,34px);
  line-height:1.42;
  font-weight:700;
  color:var(--blue-dark);
  margin:0 0 16px;
  max-width:920px;
}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:13px;color:var(--muted)}
.meta-chip{
  display:inline-flex;align-items:center;gap:6px;
  background:#fff;border:1px solid var(--border);border-radius:999px;
  padding:5px 14px;font-size:13px;color:#3d5a7a;
  box-shadow:0 2px 6px rgba(31,95,168,.05);
}
.meta-chip.accent{background:rgba(240,138,36,.1);border-color:rgba(240,138,36,.32);color:var(--orange-dark);font-weight:600}
.meta-chip .dot{width:6px;height:6px;border-radius:50%;background:var(--blue-mid);display:inline-block}

/* ============ Article layout ============ */
.article-wrap{padding:52px 0 24px}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:36px;align-items:start}
.article-paper{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);
  box-shadow:var(--shadow);padding:34px 38px 38px;
  min-width:0;
}
.summary-card{
  background:linear-gradient(180deg,#eef5ff 0%,#e8f0fb 100%);
  border:1px solid var(--blue-mid);
  border-radius:var(--radius);padding:22px 24px;margin-bottom:28px;
}
.summary-card h2{
  font-size:16px;color:var(--blue-dark);font-weight:700;
  margin:0 0 12px;display:flex;align-items:center;gap:8px;
}
.summary-card h2::before{content:"";width:4px;height:16px;border-radius:2px;background:var(--blue);display:inline-block}
.summary-card ul{list-style:none;margin:0;padding:0}
.summary-card li{
  position:relative;padding-left:20px;font-size:14.5px;line-height:1.85;color:#2f4a68;margin-bottom:8px;
}
.summary-card li:last-child{margin-bottom:0}
.summary-card li::before{
  content:"";position:absolute;left:2px;top:11px;width:7px;height:7px;border-radius:2px;
  background:var(--blue);transform:rotate(45deg);
}

/* ============ Prose ============ */
.article-body{font-size:16px;line-height:1.9;color:#26384a;max-width:780px;word-wrap:break-word;overflow-wrap:break-word}
.article-body>*:first-child{margin-top:0}
.article-body h2{
  position:relative;font-size:22px;line-height:1.5;font-weight:700;color:var(--blue-dark);
  margin:34px 0 14px;padding-left:15px;scroll-margin-top:96px;
}
.article-body h2::before{
  content:"";position:absolute;left:0;top:4px;bottom:4px;width:4px;border-radius:2px;background:var(--blue);
}
.article-body h3{
  font-size:18px;line-height:1.6;font-weight:600;color:var(--blue-dark);
  margin:24px 0 10px;padding-left:12px;border-left:3px solid var(--blue-mid);
  scroll-margin-top:96px;
}
.article-body h4{font-size:16px;font-weight:600;color:#2b4a6d;margin:20px 0 8px}
.article-body p{margin:0 0 1.05em}
.article-body ul,.article-body ol{margin:0 0 1.05em;padding-left:1.45em}
.article-body li{margin:6px 0}
.article-body li::marker{color:var(--blue)}
.article-body blockquote{
  margin:20px 0;padding:16px 20px;background:var(--blue-soft);
  border-left:4px solid var(--blue);border-radius:0 10px 10px 0;color:#2b4a6d;
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:10px;margin:20px auto;box-shadow:var(--shadow)}
.article-body figure{margin:20px 0}
.article-body figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:8px}
.article-body a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}
.article-body a:hover{color:var(--orange-dark)}
.article-body table{width:100%;border-collapse:collapse;font-size:14.5px;margin:18px 0;display:block;overflow-x:auto}
.article-body th,.article-body td{border:1px solid var(--border);padding:10px 12px;text-align:left}
.article-body th{background:var(--blue-soft);color:var(--blue-dark);font-weight:600}
.article-body hr{border:0;border-top:1px solid var(--border);margin:28px 0}
.article-body code{background:#eef4fd;color:#174a86;border-radius:4px;padding:1px 6px;font-size:14px}

/* ============ Side column ============ */
.side-col{min-width:0}
.side-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:22px;margin-bottom:20px;
  transition:box-shadow .25s ease,border-color .25s ease;
}
.side-card:hover{box-shadow:var(--shadow-md);border-color:var(--blue-mid)}
.side-card h3{
  font-size:15px;font-weight:700;color:var(--blue-dark);
  margin:0 0 14px;padding-bottom:10px;border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:8px;
}
.side-card h3::before{content:"";width:4px;height:14px;border-radius:2px;background:var(--orange);display:inline-block}
.toc-list{list-style:none;margin:0;padding:0;font-size:14px;max-height:340px;overflow:auto}
.toc-list li{margin:0 0 4px}
.toc-list a{
  display:block;padding:7px 10px;border-radius:6px;color:#3b5470;
  border-left:2px solid transparent;line-height:1.55;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.toc-list a:hover{background:var(--blue-soft);color:var(--blue-dark);text-decoration:none;border-left-color:var(--blue)}
.side-note{font-size:13.5px;line-height:1.8;color:var(--muted);margin:0}
.side-dl{background:linear-gradient(160deg,#f2f7fe 0%,#e8f0fb 100%);border:1px solid var(--blue-mid)}
.side-dl h3{border-bottom-color:var(--blue-mid)}
.side-dl p{font-size:13.5px;color:#3d5a7a;line-height:1.8;margin:0 0 14px}
.side-dl .btn{margin-bottom:8px}
.side-dl .btn:last-child{margin-bottom:0}
.back-links{display:flex;flex-direction:column;gap:8px;font-size:14px}
.back-links a{display:inline-flex;align-items:center;gap:6px;color:var(--blue);padding:6px 0}
.back-links a::before{content:"›";color:var(--orange);font-weight:700}

/* ============ Empty state ============ */
.empty-state{text-align:center;padding:56px 20px}
.empty-icon{
  width:56px;height:56px;border-radius:50%;margin:0 auto 18px;
  background:var(--blue-soft);color:var(--blue);font-size:26px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.empty-state h2{font-size:20px;color:var(--blue-dark);margin:0 0 10px}
.empty-state p{color:var(--muted);font-size:15px;margin:0 0 22px}

/* ============ Generic sections ============ */
.section{padding:var(--section-pad) 0}
.section-alt{background:#fff;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.section-head{max-width:760px;margin:0 0 36px}
.section-head .eyebrow{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:1.2px;
  color:var(--blue);background:var(--blue-soft);border-radius:999px;padding:5px 14px;margin-bottom:14px;
}
.section-head h2{font-size:clamp(21px,2.4vw,28px);line-height:1.45;color:var(--blue-dark);margin:0 0 12px}
.section-head p{font-size:15px;color:var(--muted);line-height:1.85;margin:0}

/* ============ Related posts ============ */
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--gap)}
.post-card{
  display:flex;flex-direction:column;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:24px;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.post-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue-mid)}
.post-card .post-no{
  font-size:13px;font-weight:700;color:var(--orange);
  letter-spacing:1px;margin-bottom:10px;
}
.post-card h3{font-size:16.5px;line-height:1.6;margin:0 0 10px;font-weight:600}
.post-card h3 a{color:var(--blue-dark)}
.post-card h3 a:hover{color:var(--blue);text-decoration:none}
.post-card p{font-size:14px;line-height:1.8;color:var(--muted);margin:0 0 16px;flex:1}
.post-card .post-meta{font-size:12.5px;color:#7b91a8;display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding-top:12px;border-top:1px dashed var(--border)}
.related-empty{
  background:#fff;border:1px dashed var(--blue-mid);border-radius:var(--radius);
  padding:34px;text-align:center;color:var(--muted);font-size:15px;
}

/* ============ Topic cards ============ */
.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:var(--gap)}
.topic-card{
  display:block;background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.topic-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue-mid);text-decoration:none}
.topic-thumb{aspect-ratio:4/3;overflow:hidden;background:var(--blue-soft)}
.topic-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.topic-card:hover .topic-thumb img{transform:scale(1.04)}
.topic-body{padding:16px 18px 20px}
.topic-body h3{font-size:15.5px;line-height:1.55;color:var(--blue-dark);margin:0 0 6px;font-weight:600}
.topic-body span{font-size:13px;color:var(--muted);line-height:1.7;display:block}

/* ============ Check list section ============ */
.check-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.check-item{
  display:flex;gap:14px;background:#fff;border:1px solid var(--border);
  border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow);
  transition:border-color .25s ease,box-shadow .25s ease;
}
.check-item:hover{border-color:var(--blue-mid);box-shadow:var(--shadow-md)}
.check-icon{
  flex-shrink:0;width:36px;height:36px;border-radius:10px;
  background:var(--blue-soft);color:var(--blue);font-weight:700;font-size:15px;
  display:flex;align-items:center;justify-content:center;
}
.check-item h3{font-size:15.5px;color:var(--blue-dark);margin:0 0 6px;font-weight:600}
.check-item p{font-size:14px;line-height:1.8;color:var(--muted);margin:0}

/* ============ FAQ ============ */
.faq-list{display:grid;gap:14px;max-width:900px}
.faq-item{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
  transition:border-color .25s ease,box-shadow .25s ease;
}
.faq-item[open]{border-color:var(--blue-mid);box-shadow:var(--shadow-md)}
.faq-item summary{
  list-style:none;cursor:pointer;padding:18px 54px 18px 22px;position:relative;
  font-size:15.5px;font-weight:600;color:var(--blue-dark);line-height:1.6;
  transition:background .2s ease,color .2s ease;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{background:var(--blue-soft);color:var(--blue)}
.faq-item summary::after{
  content:"";position:absolute;right:22px;top:50%;width:9px;height:9px;
  border-right:2px solid var(--blue);border-bottom:2px solid var(--blue);
  transform:translateY(-70%) rotate(45deg);transition:transform .25s ease;
}
.faq-item[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq-body{padding:0 22px 20px;font-size:14.5px;line-height:1.9;color:#42586e}
.faq-body p{margin:0}

/* ============ Download strip ============ */
.dl-section{padding:0 0 var(--section-pad)}
.dl-card{
  background:linear-gradient(135deg,#f2f7fe 0%,#e8f0fb 100%);
  border:1px solid var(--blue-mid);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md);padding:34px 38px;
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:32px;align-items:center;
}
.dl-intro h2{font-size:clamp(20px,2.3vw,26px);color:var(--blue-dark);margin:0 0 12px;line-height:1.45}
.dl-intro p{font-size:14.5px;line-height:1.85;color:#3d5a7a;margin:0}
.dl-buttons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.dl-btn{
  display:flex;flex-direction:column;align-items:center;gap:8px;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:18px 12px;text-align:center;text-decoration:none;
  box-shadow:0 4px 14px rgba(31,95,168,.06);
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease,background .22s ease;
}
.dl-btn:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue);text-decoration:none;background:#fbfdff}
.dl-btn .dl-icon{
  width:38px;height:38px;border-radius:10px;background:var(--blue-soft);color:var(--blue);
  display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700;
}
.dl-btn strong{font-size:15px;color:var(--blue-dark);font-weight:600}
.dl-btn span{font-size:12.5px;color:var(--muted)}
.dl-note{
  grid-column:1 / -1;font-size:13px;color:var(--muted);line-height:1.8;
  border-top:1px dashed var(--blue-mid);padding-top:16px;margin:0;
}

/* ============ Footer ============ */
.site-footer{background:#0f3c6e;color:#bdd3ec;padding:64px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:36px;padding-bottom:40px}
.footer-brand h3{color:#fff;font-size:18px;margin:0 0 12px;font-weight:700}
.footer-brand p{font-size:14px;line-height:1.9;color:#a9c4e2;margin:0}
.footer-col h4{color:#fff;font-size:14px;letter-spacing:1px;margin:0 0 14px;font-weight:600}
.footer-col a,.footer-col span{display:block;font-size:14px;color:#a9c4e2;padding:5px 0;transition:color .2s ease,transform .2s ease}
.footer-col a:hover{color:#fff;text-decoration:none;transform:translateX(2px)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.14);
  padding:18px 0 22px;display:flex;flex-wrap:wrap;gap:10px;
  justify-content:space-between;font-size:13px;color:#8fb0d4;
}

/* ============ Responsive ============ */
@media (max-width:1199px){
  :root{--section-pad:70px;--gap:20px}
  .article-layout{grid-template-columns:minmax(0,1fr) 290px;gap:28px}
  .article-paper{padding:30px 28px 32px}
  .topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:991px){
  .header-inner{gap:14px}
  .nav-burger{display:inline-flex}
  .mega-toggle{display:none}
  .mega-panel{display:none}
  .main-nav{
    display:none;position:absolute;top:72px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:4px;
    background:#fff;border-bottom:1px solid var(--border);
    padding:14px 18px 18px;box-shadow:var(--shadow-md);
  }
  .main-nav.open{display:flex}
  .main-nav a{height:46px;padding:0 14px;font-size:15px}
  .main-nav a::after{display:none}
  .article-layout{grid-template-columns:minmax(0,1fr)}
  .side-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
  .side-card{margin-bottom:0}
  .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .check-grid{grid-template-columns:minmax(0,1fr)}
  .dl-card{grid-template-columns:minmax(0,1fr);padding:28px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:767px){
  :root{--section-pad:54px;--gap:16px}
  .container{padding:0 18px}
  .header-actions .btn-accent{display:none}
  .logo-sub{display:none}
  .logo-main{font-size:16px}
  .article-hero{padding:24px 0 28px}
  .article-hero h1{font-size:22px;line-height:1.5}
  .breadcrumb .current{white-space:normal}
  .article-wrap{padding:32px 0 12px}
  .article-paper{padding:22px 18px 26px;border-radius:var(--radius)}
  .summary-card{padding:18px 18px}
  .article-body{font-size:15.5px;line-height:1.85}
  .article-body h2{font-size:19.5px;margin:28px 0 12px}
  .article-body h3{font-size:17px}
  .side-col{grid-template-columns:minmax(0,1fr)}
  .related-grid{grid-template-columns:minmax(0,1fr)}
  .topic-grid{grid-template-columns:minmax(0,1fr)}
  .dl-buttons{grid-template-columns:minmax(0,1fr)}
  .dl-card{padding:22px 18px;gap:22px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:24px;padding-bottom:30px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .btn{padding:12px 22px}
}
@media (max-width:520px){
  .meta-row{gap:8px}
  .meta-chip{font-size:12px;padding:4px 11px}
  .section-head h2{font-size:20px}
}