/* roulang page: index */
:root{
  --brand-600:#2D5BD7;
  --brand-700:#1E44A8;
  --brand-100:#E9F0FF;
  --accent-600:#D9543A;
  --accent-100:#FFF0EC;
  --bg:#F5F7FB;
  --surface:#FFFFFF;
  --ink:#101B2D;
  --muted:#5F6F86;
  --line:#E2E8F2;
  --ok:#1F9D6A;
  --radius-lg:18px;
  --radius-md:14px;
  --radius-sm:10px;
  --shadow-sm:0 4px 14px rgba(16,27,45,.05);
  --shadow-md:0 10px 30px rgba(16,27,45,.07);
  --shadow-lg:0 18px 44px rgba(16,27,45,.12);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--brand-700);text-decoration:none;transition:color .2s ease;}
a:hover{color:var(--brand-600);}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.35;color:var(--ink);letter-spacing:.2px;}
h1{font-size:clamp(2.2rem,4.2vw,3.4rem);}
h2{font-size:clamp(1.6rem,2.4vw,2.1rem);}
h3{font-size:1.25rem;}
p{margin:0 0 16px;}
ul{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}
:focus-visible{outline:3px solid rgba(45,91,215,.28);outline-offset:2px;}
.container{max-width:1200px;padding-left:20px;padding-right:20px;}
.section{padding:88px 0;}
.section--tight{padding:64px 0;}
.section--alt{background:var(--surface);}
.section--soft{background:var(--brand-100);}
.section-head{max-width:820px;margin-bottom:44px;}
.section-head p{color:var(--muted);font-size:1rem;margin-top:14px;margin-bottom:0;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--brand-100);color:var(--brand-700);
  border-radius:999px;padding:6px 14px;font-size:.78rem;font-weight:600;
  letter-spacing:.4px;margin-bottom:16px;
}
.eyebrow.accent{background:var(--accent-100);color:var(--accent-600);}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;background:var(--surface);
  border-bottom:1px solid var(--line);transition:box-shadow .2s ease;
}
.site-header.is-scrolled{box-shadow:0 6px 20px rgba(16,27,45,.08);}
.nav-inner{display:flex;align-items:center;gap:24px;height:72px;}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;flex-shrink:0;}
.brand-mark{
  width:40px;height:40px;border-radius:12px;background:var(--brand-600);
  display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0;
  box-shadow:0 6px 16px rgba(45,91,215,.28);
}
.brand-mark svg{width:22px;height:22px;}
.brand-text strong{display:block;font-size:1.05rem;font-weight:700;color:var(--ink);line-height:1.2;}
.brand-text small{display:block;font-size:.72rem;color:var(--muted);letter-spacing:.2px;line-height:1.4;}
.nav-main{margin-left:auto;}
.nav-links{display:flex;align-items:center;gap:4px;}
.nav-item-link{
  position:relative;display:inline-block;padding:8px 15px;border-radius:999px;
  color:var(--muted);font-weight:500;font-size:.94rem;transition:all .2s ease;
}
.nav-item-link::after{
  content:"";position:absolute;left:15px;right:15px;bottom:4px;height:2px;
  background:var(--brand-600);border-radius:2px;transform:scaleX(0);
  transform-origin:left;transition:transform .2s ease;
}
.nav-item-link:hover{color:var(--brand-700);background:rgba(233,240,255,.7);}
.nav-item-link:hover::after{transform:scaleX(1);}
.nav-item-link.is-active{background:var(--brand-100);color:var(--brand-700);font-weight:600;}
.nav-actions{display:flex;align-items:center;gap:10px;margin-left:8px;}
.nav-toggle{
  margin-left:auto;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);
  background:var(--surface);color:var(--ink);font-size:1.05rem;
}
.nav-toggle:hover{background:var(--brand-100);color:var(--brand-700);}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;border-radius:var(--radius-sm);transition:all .2s ease;border:1px solid transparent;}
.btn-brand{background:var(--brand-600);color:#fff;height:46px;padding:0 20px;font-size:.95rem;box-shadow:0 8px 20px rgba(45,91,215,.22);}
.btn-brand:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:0 12px 26px rgba(45,91,215,.28);}
.btn-brand:active{transform:translateY(0);}
.btn-ghost{background:var(--surface);color:var(--brand-700);border-color:var(--brand-600);height:46px;padding:0 20px;font-size:.95rem;}
.btn-ghost:hover{background:var(--brand-100);color:var(--brand-700);transform:translateY(-1px);}
.btn-soft{background:var(--brand-100);color:var(--brand-700);height:44px;padding:0 18px;font-size:.92rem;}
.btn-soft:hover{background:#DCE7FF;color:var(--brand-700);}
.btn-accent{background:var(--accent-600);color:#fff;height:46px;padding:0 20px;}
.btn-accent:hover{background:#BE452E;color:#fff;transform:translateY(-1px);}
.btn:disabled,[disabled].btn{opacity:.55;pointer-events:none;}
.btn-sm{height:38px;padding:0 14px;font-size:.85rem;}

/* ---------- badges / chips ---------- */
.chip{
  display:inline-flex;align-items:center;gap:6px;background:var(--brand-100);color:var(--brand-700);
  border-radius:999px;padding:4px 12px;font-size:.75rem;font-weight:600;letter-spacing:.2px;
}
.chip--accent{background:var(--accent-100);color:var(--accent-600);}
.chip--line{background:transparent;border:1px solid var(--line);color:var(--muted);}
.chip--v{background:var(--brand-600);color:#fff;}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:var(--bg);padding:72px 0 76px;}
.hero::before{
  content:"";position:absolute;inset:0;
  background:url('/assets/images/038e672cb11f333c.jpg') center/cover no-repeat;
  opacity:.09;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(45,91,215,.12) 1px,transparent 1px);
  background-size:24px 24px;opacity:.55;
}
.hero .container{position:relative;z-index:2;}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:48px;align-items:start;}
.hero-title{margin-bottom:16px;}
.hero-title .hl{color:var(--brand-700);}
.hero-sub{font-size:1.08rem;color:var(--ink);font-weight:600;margin-bottom:14px;}
.hero-lead{color:var(--muted);font-size:1rem;line-height:1.85;margin-bottom:24px;}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:22px;}
.trust-row{display:flex;flex-wrap:wrap;gap:10px;}
.trust-item{
  display:inline-flex;align-items:center;gap:8px;background:var(--surface);
  border:1px solid var(--line);border-radius:999px;padding:7px 14px;
  font-size:.82rem;color:var(--muted);box-shadow:var(--shadow-sm);
}
.trust-item i{color:var(--brand-600);}

/* hero side: plan cards */
.plan-stack{display:flex;flex-direction:column;gap:16px;}
.plan-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:20px 22px;box-shadow:var(--shadow-md);transition:all .2s ease;position:relative;
}
.plan-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:#C9D8FA;}
.plan-card.is-featured{
  border:2px solid var(--brand-600);box-shadow:0 20px 46px rgba(45,91,215,.18);
  transform:translateY(-4px);order:-1;
}
.plan-card.is-featured:hover{transform:translateY(-7px);}
.plan-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:8px;}
.plan-name{font-size:1.02rem;font-weight:700;color:var(--ink);}
.plan-desc{font-size:.86rem;color:var(--muted);margin-bottom:12px;}
.plan-list{display:flex;flex-direction:column;gap:7px;margin-bottom:16px;}
.plan-list li{position:relative;padding-left:22px;font-size:.88rem;color:var(--muted);}
.plan-list li::before{
  content:"\f00c";font-family:"Font Awesome 6 Free";font-weight:900;
  position:absolute;left:0;top:1px;font-size:.72rem;color:var(--ok);
}

/* ---------- generic cards ---------- */
.card-base{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card-base:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#C9D8FA;}

/* ---------- audience ---------- */
.audience-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.audience-card{padding:30px 28px;}
.audience-card h3{display:flex;align-items:center;gap:10px;margin-bottom:18px;font-size:1.15rem;}
.audience-card h3 i{width:34px;height:34px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-size:.9rem;}
.audience-card.fit h3 i{background:var(--brand-100);color:var(--brand-600);}
.audience-card.unfit h3 i{background:var(--accent-100);color:var(--accent-600);}
.audience-list li{
  position:relative;padding-left:24px;margin-bottom:12px;color:var(--muted);font-size:.94rem;
}
.audience-list li:last-child{margin-bottom:0;}
.audience-list li::before{
  content:"";position:absolute;left:0;top:11px;width:8px;height:8px;border-radius:50%;
  background:var(--brand-600);opacity:.65;
}
.audience-card.unfit .audience-list li::before{background:var(--accent-600);}

/* ---------- capability ---------- */
.cap-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:24px;}
.cap-card{padding:28px;grid-column:span 12;}
.cap-card.a{grid-column:span 7;}
.cap-card.b{grid-column:span 5;}
.cap-card.c{grid-column:span 5;}
.cap-card.d{grid-column:span 7;}
.cap-icon{
  width:46px;height:46px;border-radius:13px;background:var(--brand-100);color:var(--brand-600);
  display:flex;align-items:center;justify-content:center;font-size:1.05rem;margin-bottom:16px;
}
.cap-card h3{font-size:1.15rem;margin-bottom:10px;}
.cap-card p{color:var(--muted);font-size:.94rem;margin-bottom:14px;}
.cap-link{font-size:.86rem;font-weight:600;color:var(--brand-700);display:inline-flex;align-items:center;gap:6px;}
.cap-link:hover{gap:10px;}
.cap-strip{
  margin-top:24px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-md);box-shadow:var(--shadow-sm);
  display:grid;grid-template-columns:repeat(4,1fr);overflow:hidden;
}
.cap-strip div{
  padding:16px 18px;font-size:.9rem;color:var(--muted);font-weight:500;
  border-right:1px solid var(--line);display:flex;align-items:center;gap:8px;
}
.cap-strip div:last-child{border-right:0;}
.cap-strip i{color:var(--brand-600);font-size:.85rem;}

/* ---------- highlights ---------- */
.hl-scroll{display:flex;gap:12px;overflow-x:auto;padding-bottom:8px;scrollbar-width:thin;}
.hl-scroll::-webkit-scrollbar{height:6px;}
.hl-scroll::-webkit-scrollbar-thumb{background:#C9D8FA;border-radius:6px;}
.hl-item{
  flex:0 0 auto;background:var(--surface);border:1px solid #C9D8FA;border-radius:999px;
  padding:10px 18px;font-size:.88rem;font-weight:600;color:var(--brand-700);
  display:inline-flex;align-items:center;gap:8px;box-shadow:var(--shadow-sm);
}
.hl-item i{font-size:.8rem;color:var(--accent-600);}

/* ---------- plans compare ---------- */
.compare-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch;}
.compare-card{padding:26px 24px;display:flex;flex-direction:column;}
.compare-card h3{font-size:1.08rem;margin-bottom:6px;}
.compare-tag{font-size:.78rem;color:var(--muted);margin-bottom:16px;}
.compare-card ul{display:flex;flex-direction:column;gap:9px;margin-bottom:20px;}
.compare-card ul li{position:relative;padding-left:20px;font-size:.9rem;color:var(--muted);}
.compare-card ul li::before{
  content:"\f0da";font-family:"Font Awesome 6 Free";font-weight:900;
  position:absolute;left:0;top:0;font-size:.72rem;color:var(--brand-600);
}
.compare-card .btn{margin-top:auto;width:100%;}
.compare-card.is-pick{border:2px solid var(--brand-600);box-shadow:0 16px 40px rgba(45,91,215,.15);}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative;}
.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px 22px;box-shadow:var(--shadow-sm);transition:all .2s ease;}
.step:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#C9D8FA;}
.step-num{
  width:40px;height:40px;border-radius:12px;background:var(--brand-600);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.95rem;margin-bottom:16px;
}
.step h3{font-size:1.02rem;margin-bottom:8px;}
.step p{font-size:.88rem;color:var(--muted);margin:0;}

/* ---------- scenes ---------- */
.scene-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.scene-col{display:flex;flex-direction:column;gap:24px;}
.scene-card{overflow:hidden;display:flex;flex-direction:column;}
.scene-thumb{position:relative;overflow:hidden;border-radius:var(--radius-lg) var(--radius-lg) 0 0;}
.scene-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease;}
.scene-card:hover .scene-thumb img{transform:scale(1.04);}
.scene-card.lg .scene-thumb{aspect-ratio:16/10;}
.scene-card.sm .scene-thumb{aspect-ratio:16/9;}
.scene-body{padding:20px 22px 22px;}
.scene-body h3{font-size:1.05rem;margin:10px 0 8px;}
.scene-body p{font-size:.88rem;color:var(--muted);margin-bottom:14px;}
.scene-link{font-size:.86rem;font-weight:600;color:var(--brand-700);display:inline-flex;align-items:center;gap:6px;}
.scene-link:hover{gap:10px;}

/* ---------- safety ---------- */
.safety-wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;}
.safety-row{
  display:flex;gap:16px;padding:18px 0;border-bottom:1px dashed var(--line);
}
.safety-row:last-child{border-bottom:0;}
.safety-row i{
  width:40px;height:40px;border-radius:12px;background:var(--brand-100);color:var(--brand-600);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.safety-row h3{font-size:1rem;margin-bottom:4px;}
.safety-row p{font-size:.88rem;color:var(--muted);margin:0;}
.safety-figure{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg);aspect-ratio:4/3;}
.safety-figure img{width:100%;height:100%;object-fit:cover;}

/* ---------- platform stats/dimension ---------- */
.dim-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.dim-card{padding:26px 22px;}
.dim-card i{font-size:1.2rem;color:var(--brand-600);margin-bottom:14px;display:block;}
.dim-card h3{font-size:1rem;margin-bottom:8px;}
.dim-card p{font-size:.86rem;color:var(--muted);margin:0;}

/* ---------- tags ---------- */
.tag-cloud{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:28px;}
.tag-item{
  background:var(--surface);border:1px solid var(--line);border-radius:999px;
  padding:9px 18px;font-size:.88rem;color:var(--muted);transition:all .2s ease;
}
.tag-item:hover{border-color:var(--brand-600);color:var(--brand-700);background:var(--brand-100);}
.topic-entry{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:22px 26px;box-shadow:var(--shadow-sm);
}
.topic-entry strong{display:block;font-size:1rem;margin-bottom:4px;}
.topic-entry span{font-size:.88rem;color:var(--muted);}

/* ---------- download ---------- */
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.dl-card{padding:30px 26px;text-align:left;display:flex;flex-direction:column;}
.dl-icon{
  width:52px;height:52px;border-radius:15px;background:var(--brand-100);color:var(--brand-600);
  display:flex;align-items:center;justify-content:center;font-size:1.25rem;margin-bottom:18px;
}
.dl-card h3{font-size:1.1rem;margin-bottom:8px;}
.dl-card p{font-size:.9rem;color:var(--muted);margin-bottom:20px;}
.dl-card .btn{width:100%;margin-top:auto;}
.dl-note{
  margin-top:24px;display:flex;gap:12px;align-items:flex-start;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);
  padding:16px 20px;font-size:.88rem;color:var(--muted);
}
.dl-note i{color:var(--accent-600);margin-top:4px;}

/* ---------- news ---------- */
.news-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.news-card{display:flex;gap:18px;padding:18px;align-items:flex-start;}
.news-thumb{
  flex:0 0 150px;width:150px;aspect-ratio:4/3;border-radius:var(--radius-md);overflow:hidden;display:block;
}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease;}
.news-card:hover .news-thumb img{transform:scale(1.05);}
.news-body{flex:1;min-width:0;}
.news-body .chip{margin-bottom:8px;}
.news-title{font-size:1rem;margin-bottom:8px;line-height:1.5;}
.news-title a{color:var(--ink);}
.news-title a:hover{color:var(--brand-700);}
.news-excerpt{font-size:.86rem;color:var(--muted);margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.news-meta{font-size:.78rem;color:#8A99AE;}
.empty-state{
  background:var(--surface);border:1px dashed var(--line);border-radius:var(--radius-lg);
  padding:56px 24px;text-align:center;color:var(--muted);
}
.empty-state i{font-size:1.6rem;color:#C9D8FA;margin-bottom:12px;display:block;}
.empty-state strong{display:block;color:var(--ink);margin-bottom:6px;}
.list-more{margin-top:32px;text-align:center;}

/* ---------- faq ---------- */
.accordion-item{
  border:1px solid var(--line);border-radius:var(--radius-md)!important;overflow:hidden;
  margin-bottom:12px;background:var(--surface);box-shadow:var(--shadow-sm);
}
.accordion-button{
  font-weight:600;font-size:1rem;color:var(--ink);background:var(--surface);
  padding:18px 22px;box-shadow:none!important;border-radius:0!important;
}
.accordion-button:not(.collapsed){color:var(--brand-700);background:var(--brand-100);}
.accordion-button::after{
  content:"+";background-image:none;font-size:1.4rem;line-height:1;color:var(--brand-600);
  width:auto;height:auto;transform:none!important;font-weight:400;
}
.accordion-button:not(.collapsed)::after{content:"−";}
.accordion-body{padding:0 22px 20px;font-size:.92rem;color:var(--muted);background:var(--surface);}

/* ---------- guarantee bar ---------- */
.guarantee{background:var(--brand-700);color:#fff;padding:64px 0;}
.guarantee h2{color:#fff;}
.guarantee .lead-line{color:rgba(255,255,255,.78);margin-top:14px;margin-bottom:0;font-size:.95rem;}
.guarantee-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:40px;}
.guarantee-item{padding:0 24px;border-left:1px solid rgba(255,255,255,.18);}
.guarantee-item:first-child{border-left:0;padding-left:0;}
.guarantee-item i{font-size:1.1rem;color:#BBD0FF;margin-bottom:12px;display:block;}
.guarantee-item h3{color:#fff;font-size:1rem;margin-bottom:8px;}
.guarantee-item p{color:rgba(255,255,255,.76);font-size:.86rem;margin:0;}

/* ---------- contact ---------- */
.contact-wrap{display:grid;grid-template-columns:1fr 1.05fr;gap:48px;align-items:start;}
.contact-list li{
  display:flex;gap:12px;align-items:flex-start;margin-bottom:16px;font-size:.92rem;color:var(--muted);
}
.contact-list i{color:var(--brand-600);margin-top:5px;}
.form-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:30px;box-shadow:var(--shadow-md);}
.form-label{font-size:.88rem;font-weight:600;color:var(--ink);margin-bottom:6px;}
.form-control,.form-select{
  height:48px;border-radius:var(--radius-sm);border:1px solid var(--line);
  font-size:.92rem;color:var(--ink);padding:0 14px;box-shadow:none;
}
textarea.form-control{height:auto;padding:12px 14px;resize:vertical;}
.form-control:focus,.form-select:focus{
  border-color:var(--brand-600);box-shadow:0 0 0 3px rgba(45,91,215,.18);
}
.form-control::placeholder{color:#A6B2C4;}
.form-check-input{border-color:var(--line);}
.form-check-input:checked{background-color:var(--brand-600);border-color:var(--brand-600);}
.form-check-input:focus{box-shadow:0 0 0 3px rgba(45,91,215,.18);}
.form-check-label{font-size:.84rem;color:var(--muted);}
.form-check-input.is-invalid,.form-control.is-invalid{border-color:#D64545;}
.invalid-hint{display:none;font-size:.78rem;color:#D64545;margin-top:6px;}
.is-invalid ~ .invalid-hint{display:block;}

/* ---------- footer ---------- */
.site-footer{background:#0E1A2E;color:#A9B7CB;padding:64px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px;}
.footer-brand .brand-mark{box-shadow:none;}
.footer-brand strong{display:block;color:#fff;font-size:1.02rem;margin-bottom:10px;}
.footer-brand p{font-size:.86rem;line-height:1.8;color:#9AABC2;margin-bottom:14px;}
.footer-col h4{color:#fff;font-size:.92rem;margin-bottom:16px;font-weight:600;}
.footer-col ul li{margin-bottom:10px;}
.footer-col ul li a{color:#9AABC2;font-size:.86rem;}
.footer-col ul li a:hover{color:#fff;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding:20px 0;
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:.8rem;color:#7F8FA6;
}
.footer-bottom a{color:#9AABC2;}

/* ---------- offcanvas ---------- */
.nav-drawer{width:min(360px,86vw);background:var(--surface);}
.offcanvas-header{border-bottom:1px solid var(--line);padding:18px 20px;}
.drawer-links{display:flex;flex-direction:column;gap:6px;padding:18px 20px;}
.drawer-links a{
  display:flex;align-items:center;min-height:46px;padding:10px 14px;border-radius:var(--radius-sm);
  color:var(--ink);font-weight:500;
}
.drawer-links a:hover,.drawer-links a.is-active{background:var(--brand-100);color:var(--brand-700);}
.drawer-actions{display:flex;flex-direction:column;gap:10px;padding:0 20px 24px;}
.drawer-actions .btn{width:100%;}

/* ---------- responsive ---------- */
@media (max-width:1199.98px){
  .section{padding:72px 0;}
  .hero-grid{gap:32px;}
  .cap-grid{gap:20px;}
  .compare-grid{gap:18px;}
  .dim-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:32px;}
}
@media (max-width:991.98px){
  .nav-inner{height:66px;}
  .hero{padding:56px 0 60px;}
  .hero-grid{grid-template-columns:1fr;}
  .plan-card.is-featured{transform:none;}
  .audience-grid{grid-template-columns:1fr;}
  .cap-card.a,.cap-card.b,.cap-card.c,.cap-card.d{grid-column:span 12;}
  .cap-strip{grid-template-columns:1fr 1fr;}
  .cap-strip div:nth-child(2){border-right:0;}
  .cap-strip div:nth-child(1),.cap-strip div:nth-child(2){border-bottom:1px solid var(--line);}
  .compare-grid{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr 1fr;}
  .scene-grid{grid-template-columns:1fr;}
  .safety-wrap{grid-template-columns:1fr;}
  .dl-grid{grid-template-columns:1fr;}
  .news-grid{grid-template-columns:1fr;}
  .guarantee-grid{grid-template-columns:1fr 1fr;gap:28px 0;}
  .guarantee-item:nth-child(3){border-left:0;padding-left:0;}
  .contact-wrap{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:767.98px){
  .section{padding:56px 0;}
  .section--tight{padding:44px 0;}
  .hero-sub{font-size:1rem;}
  .steps{grid-template-columns:1fr;}
  .dim-grid{grid-template-columns:1fr;}
  .news-card{flex-direction:column;}
  .news-thumb{width:100%;flex:0 0 auto;aspect-ratio:16/9;}
  .guarantee-item{padding:0 18px;}
  .footer-grid{grid-template-columns:1fr;}
  .form-panel{padding:22px;}
}
@media (max-width:575.98px){
  h1{font-size:1.85rem;}
  h2{font-size:1.42rem;}
  .hero-cta .btn{width:100%;}
  .cap-strip{grid-template-columns:1fr;}
  .cap-strip div{border-right:0;border-bottom:1px solid var(--line);}
  .cap-strip div:last-child{border-bottom:0;}
  .guarantee-grid{grid-template-columns:1fr;}
  .guarantee-item{border-left:0;padding-left:0;border-top:1px solid rgba(255,255,255,.16);padding-top:20px;}
  .guarantee-item:first-child{border-top:0;padding-top:0;}
  .topic-entry{flex-direction:column;align-items:flex-start;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;scroll-behavior:auto!important;}
}

/* roulang page: category1 */
:root{
  --brand-600:#2D5BD7;
  --brand-700:#1E44A8;
  --brand-100:#E9F0FF;
  --accent-600:#D9543A;
  --accent-100:#FFF0EC;
  --bg:#F5F7FB;
  --surface:#FFFFFF;
  --ink:#101B2D;
  --muted:#5F6F86;
  --line:#E2E8F2;
  --ok:#1F9D6A;
  --radius-lg:18px;
  --radius-md:14px;
  --radius-sm:10px;
  --shadow-sm:0 4px 14px rgba(16,27,45,.05);
  --shadow-md:0 10px 30px rgba(16,27,45,.07);
  --shadow-lg:0 18px 44px rgba(16,27,45,.12);
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:16px;line-height:1.75;color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--brand-700);text-decoration:none;transition:color .2s ease;}
a:hover{color:var(--brand-600);}
ul,ol{list-style:none;margin:0;padding:0;}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.35;letter-spacing:-.2px;}
h1{font-size:clamp(1.85rem,3.5vw,2.85rem);}
h2{font-size:clamp(1.45rem,2.3vw,1.95rem);}
h3{font-size:1.14rem;}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
.section{padding:80px 0;}
.section--tight{padding:58px 0;}
.section--alt{background:var(--surface);}
.section--soft{background:var(--brand-100);}
.section-head{max-width:780px;margin-bottom:40px;}
.section-head p{color:var(--muted);margin-top:14px;margin-bottom:0;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;background:var(--brand-100);color:var(--brand-700);
  border-radius:999px;padding:6px 14px;font-size:.78rem;font-weight:600;letter-spacing:.3px;margin-bottom:14px;
}
.eyebrow.is-accent{background:var(--accent-100);color:var(--accent-600);}
/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;background:var(--surface);
  border-bottom:1px solid var(--line);transition:box-shadow .2s ease;
}
.site-header.is-scrolled{box-shadow:0 6px 20px rgba(16,27,45,.08);}
.nav-inner{display:flex;align-items:center;gap:20px;height:72px;}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;flex-shrink:0;}
.brand-mark{
  width:40px;height:40px;border-radius:12px;background:var(--brand-600);
  display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0;
  box-shadow:0 6px 16px rgba(45,91,215,.28);
}
.brand-mark svg{width:22px;height:22px;}
.brand-text strong{display:block;font-size:1.03rem;font-weight:700;color:var(--ink);line-height:1.2;}
.brand-text small{display:block;font-size:.71rem;color:var(--muted);letter-spacing:.2px;line-height:1.4;}
.nav-main{margin-left:auto;}
.nav-links{display:flex;align-items:center;gap:4px;}
.nav-item-link{
  position:relative;display:inline-block;padding:8px 15px;border-radius:999px;
  color:var(--muted);font-weight:500;font-size:.94rem;transition:all .2s ease;
}
.nav-item-link::after{
  content:"";position:absolute;left:15px;right:15px;bottom:4px;height:2px;background:var(--brand-600);
  border-radius:2px;transform:scaleX(0);transform-origin:left;transition:transform .2s ease;
}
.nav-item-link:hover{color:var(--brand-700);background:rgba(233,240,255,.7);}
.nav-item-link:hover::after{transform:scaleX(1);}
.nav-item-link.is-active{background:var(--brand-100);color:var(--brand-700);font-weight:600;}
.nav-actions{display:flex;align-items:center;gap:10px;margin-left:8px;}
.nav-toggle{
  margin-left:auto;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);
  background:var(--surface);color:var(--ink);font-size:1.05rem;display:inline-flex;
  align-items:center;justify-content:center;transition:all .2s ease;
}
.nav-toggle:hover{background:var(--brand-100);color:var(--brand-700);}
.offcanvas{max-width:320px;}
.offcanvas-title{font-size:1rem;font-weight:700;color:var(--ink);}
.mobile-nav-list{display:flex;flex-direction:column;gap:4px;}
.mobile-nav-list a{
  display:flex;align-items:center;justify-content:space-between;min-height:46px;padding:10px 14px;
  border-radius:12px;color:var(--ink);font-weight:500;border:1px solid transparent;
}
.mobile-nav-list a:hover,.mobile-nav-list a.is-active{background:var(--brand-100);color:var(--brand-700);}
.mobile-nav-actions{display:flex;flex-direction:column;gap:10px;margin-top:20px;}
/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;
  border-radius:var(--radius-sm);transition:all .2s ease;border:1px solid transparent;cursor:pointer;
}
.btn-brand{background:var(--brand-600);color:#fff;height:46px;padding:0 20px;font-size:.95rem;box-shadow:0 8px 20px rgba(45,91,215,.22);}
.btn-brand:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:0 12px 26px rgba(45,91,215,.28);}
.btn-brand:active{transform:translateY(0);}
.btn-ghost{background:var(--surface);color:var(--brand-700);border-color:var(--brand-600);height:46px;padding:0 20px;font-size:.95rem;}
.btn-ghost:hover{background:var(--brand-100);color:var(--brand-700);transform:translateY(-1px);}
.btn-ghost:active{transform:translateY(0);}
.btn-soft{background:var(--brand-100);color:var(--brand-700);height:44px;padding:0 18px;font-size:.92rem;}
.btn-soft:hover{background:#DCE7FF;color:var(--brand-700);}
.btn-accent{background:var(--accent-600);color:#fff;height:44px;padding:0 18px;font-size:.92rem;}
.btn-accent:hover{background:#BE452E;color:#fff;transform:translateY(-1px);}
.btn:focus-visible,.nav-item-link:focus-visible,a:focus-visible,button:focus-visible{
  outline:none;box-shadow:0 0 0 3px rgba(45,91,215,.28);
}
.btn-block{width:100%;}
/* ---------- chips ---------- */
.chip{
  display:inline-flex;align-items:center;gap:6px;background:var(--brand-100);color:var(--brand-700);
  border-radius:999px;padding:4px 12px;font-size:.75rem;font-weight:600;letter-spacing:.2px;
}
.chip--accent{background:var(--accent-100);color:var(--accent-600);}
.chip--line{background:transparent;border:1px solid var(--line);color:var(--muted);font-weight:500;}
.chip--solid{background:var(--brand-600);color:#fff;}
/* ---------- breadcrumb / category hero ---------- */
.cat-hero{position:relative;overflow:hidden;background:var(--surface);border-bottom:1px solid var(--line);padding:34px 0 52px;}
.cat-hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:url('/assets/images/9dd4a73dd6babbec.webp') center/cover no-repeat;opacity:.07;
}
.cat-hero .container{position:relative;z-index:2;}
.crumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:.84rem;color:var(--muted);margin-bottom:22px;}
.crumb-list li{display:flex;align-items:center;gap:8px;}
.crumb-list li+li::before{content:"/";color:#B9C4D6;}
.crumb-list a{color:var(--muted);}
.crumb-list a:hover{color:var(--brand-700);}
.crumb-list [aria-current="page"]{color:var(--ink);font-weight:600;}
.cat-hero h1{margin-bottom:16px;}
.cat-hero h1 .hl{color:var(--brand-700);}
.cat-lead{max-width:760px;color:var(--muted);font-size:1.02rem;line-height:1.85;}
.meta-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px;}
/* ---------- capability ---------- */
.cap-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:24px;}
.cap-grid+.cap-grid{margin-top:24px;grid-template-columns:.88fr 1.12fr;}
.cap-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:28px;box-shadow:var(--shadow-md);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.cap-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#C7D6F7;}
.cap-icon{
  width:46px;height:46px;border-radius:13px;background:var(--brand-100);color:var(--brand-700);
  display:flex;align-items:center;justify-content:center;font-size:1.1rem;margin-bottom:16px;
}
.cap-card.is-accent .cap-icon{background:var(--accent-100);color:var(--accent-600);}
.cap-card h3{margin-bottom:10px;}
.cap-card p{color:var(--muted);font-size:.95rem;margin-bottom:14px;}
.cap-points{display:flex;flex-wrap:wrap;gap:8px;}
/* ---------- scenes ---------- */
.scene-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.scene-card{
  position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
  display:flex;flex-direction:column;
}
.scene-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#C7D6F7;}
.scene-card:nth-child(1),.scene-card:nth-child(2){grid-column:span 2;}
.scene-media{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--brand-100);}
.scene-media img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease;}
.scene-card:hover .scene-media img{transform:scale(1.03);}
.scene-body{padding:20px 22px 24px;}
.scene-body h3{margin:10px 0 8px;font-size:1.05rem;}
.scene-body p{color:var(--muted);font-size:.92rem;margin:0;}
.scene-tag{
  position:absolute;left:14px;top:14px;background:rgba(255,255,255,.94);color:var(--brand-700);
  border-radius:999px;padding:4px 12px;font-size:.74rem;font-weight:600;backdrop-filter:blur(4px);
}
/* ---------- tags ---------- */
.tag-panel{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:32px;box-shadow:var(--shadow-md);
}
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px;}
.tag-cloud span{
  display:inline-flex;align-items:center;gap:6px;background:var(--bg);border:1px solid var(--line);
  color:var(--ink);border-radius:999px;padding:8px 16px;font-size:.86rem;transition:all .2s ease;
}
.tag-cloud span:hover{background:var(--brand-100);border-color:#C7D6F7;color:var(--brand-700);}
.tag-note{color:var(--muted);font-size:.9rem;margin-top:18px;}
/* ---------- steps ---------- */
.step-list{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative;}
.step-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:24px;box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease;
}
.step-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);}
.step-num{
  display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:10px;
  background:var(--brand-600);color:#fff;font-weight:700;font-size:.9rem;margin-bottom:14px;
}
.step-item h3{font-size:1.02rem;margin-bottom:8px;}
.step-item p{color:var(--muted);font-size:.9rem;margin:0;}
/* ---------- safety ---------- */
.safety-wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;}
.safety-rows{display:flex;flex-direction:column;gap:14px;margin-top:24px;}
.safety-row{
  display:flex;gap:16px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-md);padding:18px 20px;box-shadow:var(--shadow-sm);transition:border-color .2s ease;
}
.safety-row:hover{border-color:#C7D6F7;}
.safety-row i{
  width:38px;height:38px;border-radius:11px;background:var(--brand-100);color:var(--brand-700);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:.95rem;
}
.safety-row h3{font-size:1rem;margin-bottom:4px;}
.safety-row p{color:var(--muted);font-size:.9rem;margin:0;}
.safety-media{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-md);}
.safety-media img{width:100%;height:100%;object-fit:cover;}
/* ---------- download ---------- */
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.dl-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:28px 24px;text-align:center;box-shadow:var(--shadow-md);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;display:flex;flex-direction:column;
}
.dl-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#C7D6F7;}
.dl-icon{
  width:56px;height:56px;border-radius:16px;background:var(--brand-100);color:var(--brand-700);
  display:flex;align-items:center;justify-content:center;font-size:1.4rem;margin:0 auto 16px;
}
.dl-card h3{margin-bottom:6px;}
.dl-card p{color:var(--muted);font-size:.9rem;margin-bottom:20px;}
.dl-card .btn{margin-top:auto;}
.dl-note{
  margin-top:26px;background:var(--brand-100);border-radius:var(--radius-md);padding:16px 20px;
  color:var(--brand-700);font-size:.88rem;display:flex;gap:10px;align-items:flex-start;
}
.dl-note i{margin-top:4px;}
/* ---------- accordion ---------- */
.faq-accordion .accordion-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md)!important;
  margin-bottom:12px;overflow:hidden;box-shadow:var(--shadow-sm);
}
.faq-accordion .accordion-button{
  font-weight:600;font-size:1rem;color:var(--ink);background:var(--surface);
  padding:20px 22px;box-shadow:none;gap:12px;
}
.faq-accordion .accordion-button:not(.collapsed){background:var(--brand-100);color:var(--brand-700);}
.faq-accordion .accordion-button:focus{box-shadow:0 0 0 3px rgba(45,91,215,.28);border-color:var(--brand-600);}
.faq-accordion .accordion-button::after{
  background-image:none;content:"\2b";font-family:"Noto Sans SC",Arial,sans-serif;
  font-size:1.25rem;font-weight:600;width:auto;height:auto;transform:none;color:var(--brand-700);
  transition:transform .2s ease;
}
.faq-accordion .accordion-button:not(.collapsed)::after{content:"\2212";transform:none;}
.faq-accordion .accordion-body{color:var(--muted);font-size:.95rem;padding:18px 22px 22px;background:var(--surface);}
/* ---------- closing cta ---------- */
.cta-band{
  background:var(--brand-700);border-radius:var(--radius-lg);padding:44px 40px;color:#fff;
  display:grid;grid-template-columns:1.3fr .7fr;gap:32px;align-items:center;box-shadow:var(--shadow-lg);
}
.cta-band h2{color:#fff;margin-bottom:12px;}
.cta-band p{color:rgba(255,255,255,.82);margin:0;font-size:.96rem;}
.cta-band .cta-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:flex-end;}
.cta-band .btn-brand{background:#fff;color:var(--brand-700);box-shadow:none;}
.cta-band .btn-brand:hover{background:#EEF3FF;color:var(--brand-700);}
.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,.12);color:#fff;}
/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.72);padding:64px 0 26px;margin-top:0;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;}
.footer-brand p{font-size:.9rem;line-height:1.8;margin:0;color:rgba(255,255,255,.62);}
.footer-brand .brand-text strong{color:#fff;}
.footer-brand .brand-text small{color:rgba(255,255,255,.55);}
.footer-col h4{color:#fff;font-size:.95rem;margin-bottom:16px;font-weight:600;}
.footer-col ul{display:flex;flex-direction:column;gap:10px;}
.footer-col a{color:rgba(255,255,255,.66);font-size:.9rem;}
.footer-col a:hover{color:#fff;}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;font-size:.82rem;color:rgba(255,255,255,.5);
}
/* ---------- responsive ---------- */
@media (max-width:1199px){
  .section{padding:70px 0;}
  .cap-grid,.cap-grid+.cap-grid{grid-template-columns:1fr 1fr;}
  .step-list{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:991px){
  .section{padding:60px 0;}
  .section--tight{padding:48px 0;}
  .cat-hero{padding:26px 0 42px;}
  .scene-grid{grid-template-columns:1fr 1fr;}
  .scene-card:nth-child(1),.scene-card:nth-child(2){grid-column:span 2;}
  .safety-wrap{grid-template-columns:1fr;gap:28px;}
  .safety-media{order:-1;}
  .dl-grid{grid-template-columns:1fr;}
  .cta-band{grid-template-columns:1fr;padding:34px 26px;}
  .cta-band .cta-actions{justify-content:flex-start;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:767px){
  .section{padding:52px 0;}
  .section--tight{padding:42px 0;}
  h1{font-size:1.7rem;}
  .cat-lead{font-size:.98rem;}
  .cap-grid,.cap-grid+.cap-grid{grid-template-columns:1fr;}
  .cap-card{padding:22px;}
  .scene-grid{grid-template-columns:1fr;}
  .scene-card:nth-child(1),.scene-card:nth-child(2){grid-column:span 1;}
  .step-list{grid-template-columns:1fr;}
  .tag-panel{padding:24px;}
  .dl-card{padding:24px 20px;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .cta-band{padding:28px 22px;}
  .cta-band .cta-actions .btn{width:100%;}
}
@media (max-width:575px){
  .container{padding:0 16px;}
  .nav-inner{height:64px;}
  .brand-text small{display:none;}
  .meta-row .chip{font-size:.72rem;}
  .btn{min-height:44px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important;}
}

/* roulang page: article */
:root{
  --brand-600:#2D5BD7;
  --brand-700:#1E44A8;
  --brand-100:#E9F0FF;
  --accent-600:#D9543A;
  --accent-100:#FFF0EC;
  --bg:#F5F7FB;
  --surface:#FFFFFF;
  --ink:#101B2D;
  --muted:#5F6F86;
  --line:#E2E8F2;
  --ok:#1F9D6A;
  --radius-lg:18px;
  --radius-md:14px;
  --radius-sm:10px;
  --shadow-sm:0 4px 14px rgba(16,27,45,.05);
  --shadow-md:0 10px 30px rgba(16,27,45,.07);
  --shadow-lg:0 18px 44px rgba(16,27,45,.12);
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:var(--brand-700);text-decoration:none;transition:color .2s ease,background .2s ease,border-color .2s ease;}
a:hover{color:var(--brand-600);}
button{font-family:inherit;}
ul,ol{list-style-position:outside;}
.container{width:100%;max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px;}
.section{padding:88px 0;}
.section--tight{padding:56px 0;}
.section--alt{background:var(--surface);}
.section--soft{background:var(--brand-100);}
.section-head{max-width:820px;margin-bottom:40px;}
.section-head h2{margin:0 0 12px;}
.section-head p{color:var(--muted);margin:0;font-size:1rem;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--brand-100);color:var(--brand-700);
  border-radius:999px;padding:6px 14px;font-size:.78rem;font-weight:600;
  letter-spacing:.4px;margin-bottom:14px;
}
.eyebrow.accent{background:var(--accent-100);color:var(--accent-600);}
h1,h2,h3,h4{color:var(--ink);font-weight:700;line-height:1.4;margin:0;}
h1{font-size:clamp(1.8rem,3.4vw,2.6rem);}
h2{font-size:clamp(1.45rem,2.3vw,2rem);}
h3{font-size:1.18rem;}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;background:var(--surface);
  border-bottom:1px solid var(--line);transition:box-shadow .2s ease;
}
.site-header.is-scrolled{box-shadow:0 6px 20px rgba(16,27,45,.08);}
.nav-inner{display:flex;align-items:center;gap:24px;height:72px;}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;flex-shrink:0;}
.brand-mark{
  width:40px;height:40px;border-radius:12px;background:var(--brand-600);
  display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0;
  box-shadow:0 6px 16px rgba(45,91,215,.28);
}
.brand-mark svg{width:22px;height:22px;}
.brand-text strong{display:block;font-size:1.05rem;font-weight:700;color:var(--ink);line-height:1.2;}
.brand-text small{display:block;font-size:.72rem;color:var(--muted);letter-spacing:.2px;line-height:1.4;}
.nav-main{margin-left:auto;}
.nav-links{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0;}
.nav-item-link{
  position:relative;display:inline-block;padding:8px 15px;border-radius:999px;
  color:var(--muted);font-weight:500;font-size:.94rem;transition:all .2s ease;
}
.nav-item-link::after{
  content:"";position:absolute;left:15px;right:15px;bottom:4px;height:2px;
  background:var(--brand-600);border-radius:2px;transform:scaleX(0);
  transform-origin:left;transition:transform .2s ease;
}
.nav-item-link:hover{color:var(--brand-700);background:rgba(233,240,255,.7);}
.nav-item-link:hover::after{transform:scaleX(1);}
.nav-item-link.is-active{background:var(--brand-100);color:var(--brand-700);font-weight:600;}
.nav-actions{display:flex;align-items:center;gap:10px;margin-left:8px;}
.nav-toggle{
  margin-left:auto;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);
  background:var(--surface);color:var(--ink);font-size:1.05rem;display:inline-flex;
  align-items:center;justify-content:center;
}
.nav-toggle:hover{background:var(--brand-100);color:var(--brand-700);}
.offcanvas{border-radius:0;max-width:320px;}
.offcanvas-header{border-bottom:1px solid var(--line);padding:18px 20px;}
.offcanvas-title{font-size:1rem;font-weight:700;}
.mobile-nav-list{list-style:none;margin:0;padding:0;}
.mobile-nav-list li + li{border-top:1px solid var(--line);}
.mobile-nav-list a{
  display:flex;align-items:center;justify-content:space-between;
  min-height:48px;padding:4px 2px;color:var(--ink);font-weight:500;
}
.mobile-nav-list a:hover,.mobile-nav-list a.is-active{color:var(--brand-700);}
.mobile-dl-title{font-size:.8rem;color:var(--muted);margin:26px 0 10px;font-weight:600;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:600;border-radius:var(--radius-sm);transition:all .2s ease;
  border:1px solid transparent;text-decoration:none;line-height:1;
}
.btn-brand{background:var(--brand-600);color:#fff;height:46px;padding:0 20px;font-size:.95rem;box-shadow:0 8px 20px rgba(45,91,215,.22);}
.btn-brand:hover,.btn-brand:focus-visible{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:0 12px 26px rgba(45,91,215,.28);}
.btn-brand:active{transform:translateY(0);box-shadow:0 6px 14px rgba(45,91,215,.22);}
.btn-ghost{background:var(--surface);color:var(--brand-700);border-color:var(--brand-600);height:46px;padding:0 20px;font-size:.95rem;}
.btn-ghost:hover,.btn-ghost:focus-visible{background:var(--brand-100);color:var(--brand-700);transform:translateY(-1px);}
.btn-soft{background:var(--brand-100);color:var(--brand-700);height:44px;padding:0 18px;font-size:.92rem;}
.btn-soft:hover,.btn-soft:focus-visible{background:#DCE7FF;color:var(--brand-700);}
.btn-accent{background:var(--accent-600);color:#fff;height:46px;padding:0 20px;}
.btn-accent:hover,.btn-accent:focus-visible{background:#BE452E;color:#fff;transform:translateY(-1px);}
.btn:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(45,91,215,.28);}
.btn:disabled,[disabled].btn{opacity:.55;pointer-events:none;}
.btn-sm{height:38px;padding:0 14px;font-size:.85rem;}

/* ---------- chip ---------- */
.chip{
  display:inline-flex;align-items:center;gap:6px;background:var(--brand-100);color:var(--brand-700);
  border-radius:999px;padding:4px 12px;font-size:.75rem;font-weight:600;letter-spacing:.2px;
}
.chip--accent{background:var(--accent-100);color:var(--accent-600);}
.chip--line{background:transparent;border:1px solid var(--line);color:var(--muted);}

/* ---------- article head ---------- */
.article-head{
  position:relative;background:var(--bg);padding:36px 0 56px;border-bottom:1px solid var(--line);overflow:hidden;
}
.article-head::before{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(45,91,215,.10) 1px,transparent 1px);
  background-size:24px 24px;opacity:.6;
}
.article-head .container{position:relative;z-index:2;}
.crumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:.85rem;color:var(--muted);margin-bottom:24px;}
.crumb a{color:var(--muted);}
.crumb a:hover{color:var(--brand-700);}
.crumb i{font-size:.65rem;color:#A9B6C9;}
.crumb-now{color:var(--ink);font-weight:600;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.article-head-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:44px;align-items:center;}
.article-meta-top{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px;}
.article-head h1{margin-bottom:14px;word-break:break-word;}
.article-sub{color:var(--muted);font-size:1rem;margin:0 0 20px;line-height:1.8;}
.article-meta{display:flex;flex-wrap:wrap;gap:10px;}
.article-meta span{
  display:inline-flex;align-items:center;gap:7px;background:var(--surface);
  border:1px solid var(--line);border-radius:999px;padding:6px 13px;
  font-size:.82rem;color:var(--muted);box-shadow:var(--shadow-sm);
}
.article-meta i{color:var(--brand-600);}
.article-cover{
  margin:0;border-radius:var(--radius-lg);overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--shadow-md);background:var(--surface);
}
.article-cover img{width:100%;aspect-ratio:16/9;object-fit:cover;}

/* ---------- layout ---------- */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:44px;align-items:start;}
.article-main{min-width:0;}

/* ---------- points card ---------- */
.points-card{
  background:var(--brand-100);border:1px solid #D5E2FF;border-radius:var(--radius-lg);
  padding:26px 28px;margin-bottom:36px;
}
.points-card h2{font-size:1.12rem;margin:0 0 12px;display:flex;align-items:center;gap:9px;}
.points-card h2 i{color:var(--brand-600);font-size:1rem;}
.points-card .points-summary{color:#2B3A52;margin:0 0 14px;font-size:.98rem;line-height:1.85;}
.points-list{list-style:none;margin:0;padding:0;display:grid;gap:8px;}
.points-list li{display:flex;gap:9px;font-size:.92rem;color:#2B3A52;line-height:1.7;}
.points-list li i{color:var(--brand-600);font-size:.78rem;margin-top:.42em;flex-shrink:0;}

/* ---------- article body ---------- */
.article-body{
  max-width:760px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-lg);padding:36px 38px;box-shadow:var(--shadow-md);
  font-size:1.02rem;line-height:1.9;color:#1B2942;word-break:break-word;
}
.article-body > :first-child{margin-top:0;}
.article-body p{margin:0 0 18px;}
.article-body h2{
  font-size:1.42rem;margin:38px 0 16px;position:relative;padding-left:15px;line-height:1.5;
}
.article-body h2::before{
  content:"";position:absolute;left:0;top:.3em;bottom:.3em;width:4px;
  border-radius:3px;background:var(--brand-600);
}
.article-body h3{font-size:1.15rem;margin:28px 0 12px;}
.article-body h4{font-size:1.02rem;margin:22px 0 10px;}
.article-body ul,.article-body ol{padding-left:1.4em;margin:0 0 18px;}
.article-body li{margin-bottom:8px;}
.article-body img{border-radius:var(--radius-md);margin:22px 0;}
.article-body figure{margin:22px 0;}
.article-body figcaption{font-size:.85rem;color:var(--muted);text-align:center;margin-top:8px;}
.article-body blockquote{
  margin:22px 0;padding:16px 20px;background:var(--brand-100);
  border-left:4px solid var(--brand-600);border-radius:0 var(--radius-md) var(--radius-md) 0;
  color:#233650;
}
.article-body blockquote p:last-child{margin-bottom:0;}
.article-body a{color:var(--brand-700);text-decoration:underline;text-underline-offset:3px;}
.article-body a:hover{color:var(--brand-600);}
.article-body table{
  width:100%;border-collapse:collapse;font-size:.93rem;display:block;
  overflow-x:auto;margin:22px 0;
}
.article-body table th,.article-body table td{border:1px solid var(--line);padding:10px 14px;text-align:left;}
.article-body table th{background:var(--brand-100);color:var(--brand-700);font-weight:600;white-space:nowrap;}
.article-body code{background:#F0F3F9;border-radius:6px;padding:2px 6px;font-size:.9em;color:#2B3A52;}
.article-body hr{border:0;border-top:1px solid var(--line);margin:30px 0;}

/* ---------- empty ---------- */
.empty-state{
  text-align:center;padding:48px 24px;border:1px dashed #CBD8EC;border-radius:var(--radius-md);
  background:#FAFCFF;
}
.empty-state i{font-size:2rem;color:var(--brand-600);margin-bottom:14px;}
.empty-state h2{font-size:1.2rem;margin-bottom:10px;}
.empty-state p{color:var(--muted);margin-bottom:20px;}

/* ---------- aside ---------- */
.article-aside{position:sticky;top:96px;display:flex;flex-direction:column;gap:18px;}
.toc-card,.aside-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:20px 22px;box-shadow:var(--shadow-sm);
}
.toc-title{font-size:.95rem;margin:0 0 12px;display:flex;align-items:center;gap:8px;}
.toc-title i{color:var(--brand-600);font-size:.85rem;}
.toc-list{list-style:none;margin:0;padding:0;max-height:46vh;overflow:auto;}
.toc-list li{margin-bottom:9px;line-height:1.6;}
.toc-list a{font-size:.87rem;color:var(--muted);display:block;border-left:2px solid transparent;padding-left:10px;}
.toc-list a:hover{color:var(--brand-700);border-left-color:var(--brand-600);}
.toc-list .toc-h3 a{padding-left:22px;font-size:.83rem;}
.toc-empty{font-size:.82rem;color:var(--muted);margin:0;display:none;}
.aside-card h3{font-size:.95rem;margin-bottom:8px;}
.aside-card p{font-size:.85rem;color:var(--muted);margin:0 0 14px;line-height:1.75;}

/* ---------- related ---------- */
.rel-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}
.rel-card{
  display:flex;flex-direction:column;gap:8px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--radius-lg);padding:22px 22px 24px;
  box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.rel-card:hover,.rel-card:focus-visible{
  transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#C4D6F8;color:inherit;
}
.rel-card h3{font-size:1rem;margin:0;color:var(--ink);line-height:1.6;}
.rel-card p{font-size:.86rem;color:var(--muted);margin:0;line-height:1.7;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;}
.rel-more{display:inline-flex;align-items:center;gap:6px;font-size:.82rem;color:var(--brand-700);margin-top:auto;font-weight:600;}

/* ---------- download ---------- */
.download-block{
  position:relative;overflow:hidden;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:38px;
}
.download-block::before{
  content:"";position:absolute;right:-90px;top:-90px;width:280px;height:280px;border-radius:50%;
  background:var(--brand-100);opacity:.7;
}
.download-inner{position:relative;z-index:2;}
.download-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:26px;}
.download-card{
  background:#FAFCFF;border:1px solid var(--line);border-radius:var(--radius-md);
  padding:24px 22px;text-align:center;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.download-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#C4D6F8;}
.dl-icon{
  width:52px;height:52px;border-radius:14px;background:var(--brand-100);color:var(--brand-700);
  display:inline-flex;align-items:center;justify-content:center;font-size:1.2rem;margin-bottom:14px;
}
.download-card h3{font-size:1rem;margin-bottom:8px;}
.download-card p{font-size:.85rem;color:var(--muted);margin:0 0 18px;line-height:1.7;}
.download-card .btn{width:100%;}

/* ---------- nav-next ---------- */
.nav-next{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:22px 26px;box-shadow:var(--shadow-sm);
}
.nav-next p{margin:0;color:var(--muted);font-size:.9rem;}
.nav-next .nav-next-links{display:flex;flex-wrap:wrap;gap:10px;}

/* ---------- safety strip ---------- */
.safety-strip{background:var(--brand-700);color:#fff;padding:56px 0;}
.safety-strip h2{color:#fff;margin-bottom:26px;font-size:clamp(1.35rem,2.1vw,1.75rem);}
.safety-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}
.safety-item{display:flex;gap:14px;align-items:flex-start;}
.safety-item i{
  width:42px;height:42px;border-radius:12px;background:rgba(255,255,255,.14);
  display:inline-flex;align-items:center;justify-content:center;font-size:1rem;flex-shrink:0;
}
.safety-item h3{color:#fff;font-size:.98rem;margin:0 0 6px;}
.safety-item p{color:#C9D8F2;font-size:.86rem;margin:0;line-height:1.7;}

/* ---------- footer ---------- */
.site-footer{background:#0E1A2E;color:#C9D4E6;padding:64px 0 0;margin-top:0;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;}
.footer-brand .brand{margin-bottom:14px;}
.footer-brand p{font-size:.88rem;color:#9FB0CA;margin:0;line-height:1.85;}
.footer-col h4{font-size:.95rem;color:#fff;margin:0 0 14px;font-weight:600;}
.footer-col ul{list-style:none;padding:0;margin:0;}
.footer-col li{margin-bottom:10px;}
.footer-col a{color:#A9B8D0;font-size:.88rem;}
.footer-col a:hover{color:#fff;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);margin-top:44px;padding:18px 0 22px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
  font-size:.82rem;color:#8FA0BC;
}

/* ---------- responsive ---------- */
@media (max-width:1199.98px){
  .section{padding:72px 0;}
  .article-layout{grid-template-columns:minmax(0,1fr) 270px;gap:32px;}
  .article-head-grid{gap:32px;}
}
@media (max-width:991.98px){
  .section{padding:64px 0;}
  .article-head{padding:28px 0 44px;}
  .article-head-grid{grid-template-columns:minmax(0,1fr);gap:24px;}
  .article-cover{order:-1;}
  .article-layout{grid-template-columns:minmax(0,1fr);}
  .article-aside{position:static;display:none;}
  .rel-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .download-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .safety-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px;}
}
@media (max-width:767.98px){
  .section{padding:56px 0;}
  .section--tight{padding:44px 0;}
  .article-body{padding:24px 20px;font-size:1rem;border-radius:var(--radius-md);}
  .points-card{padding:22px 20px;}
  .article-head h1{font-size:1.65rem;}
  .download-block{padding:26px 20px;}
  .download-grid{grid-template-columns:minmax(0,1fr);}
  .rel-grid{grid-template-columns:minmax(0,1fr);}
  .safety-grid{grid-template-columns:minmax(0,1fr);}
  .nav-next{flex-direction:column;align-items:flex-start;}
  .article-meta span{font-size:.78rem;}
}
@media (max-width:575.98px){
  .container{padding-left:16px;padding-right:16px;}
  .article-head h1{font-size:1.45rem;}
  .article-body h2{font-size:1.22rem;}
  .article-body h3{font-size:1.06rem;}
  .crumb-now{max-width:180px;}
  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-bottom{flex-direction:column;}
  .btn{width:100%;}
  .nav-next .nav-next-links{width:100%;}
  .download-card .btn{width:100%;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
}