/* roulang page: index */
:root {
  --primary: #3E8FA3;
  --primary-dark: #2F7186;
  --primary-light: #E3F0F4;
  --primary-lighter: #F0F7F9;
  --accent: #E09A3C;
  --accent-hover: #C9862E;
  --bg: #F6F8FA;
  --card-bg: #FFFFFF;
  --text: #293840;
  --text-secondary: #5E6E77;
  --text-light: #8A9AA3;
  --border: #D8E2E7;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 2px 8px rgba(41,56,64,0.04);
  --shadow-lg: 0 10px 28px rgba(41,56,64,0.08);
  --shadow-float: 0 4px 16px rgba(41,56,64,0.1);
  --transition: 0.25s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: color var(--transition); }
ul, ol { list-style: none; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }
input { font-family: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 76px 0; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: 24px; font-weight: 600; color: var(--text); margin-bottom: 12px; letter-spacing: 0.5px; }
.section-head p { font-size: 15px; color: var(--text-secondary); max-width: 640px; margin: 0 auto; line-height: 1.7; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  border: 1px solid transparent;
  line-height: 1.4;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(224,154,60,0.25); }
.btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); color: var(--primary-dark); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(224,154,60,0.3); }
.btn-large { padding: 14px 44px; font-size: 16px; }
.btn-sm { padding: 8px 22px; font-size: 14px; }
.btn:focus-visible { outline: 2px solid rgba(62,143,163,0.4); outline-offset: 2px; }

/* Text link */
.text-link { font-size: 13px; color: var(--primary); font-weight: 500; display: inline-flex; align-items: center; gap: 4px; transition: color var(--transition); }
.text-link:hover { color: var(--primary-dark); text-decoration: underline; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 64px;
  background: #fff;
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 2px 12px rgba(41,56,64,0.06); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.header-left { display: flex; align-items: center; gap: 32px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--primary-dark);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700;
  flex-shrink: 0;
}
.logo-text { font-size: 18px; font-weight: 700; color: var(--primary-dark); letter-spacing: 0.5px; white-space: nowrap; }
.main-nav ul { display: flex; gap: 6px; }
.main-nav ul li a {
  display: block;
  padding: 6px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 6px;
  transition: all var(--transition);
  position: relative;
}
.main-nav ul li a:hover { color: var(--primary); background: var(--primary-lighter); }
.main-nav ul li a.active { color: var(--primary); font-weight: 600; }
.main-nav ul li a.active::after {
  content: '';
  position: absolute;
  bottom: -15px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}
.header-right { display: flex; align-items: center; gap: 14px; }
.search-wrap { position: relative; display: flex; align-items: center; }
.search-btn {
  width: 38px; height: 38px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  font-size: 15px;
  transition: all var(--transition);
}
.search-btn:hover { background: var(--primary-light); color: var(--primary); }
.search-input {
  width: 0;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0;
  font-size: 14px;
  color: var(--text);
  background: #fff;
  transition: all 0.3s ease;
  outline: none;
  opacity: 0;
}
.search-wrap.open .search-input {
  width: 200px;
  padding: 0 14px;
  opacity: 1;
  margin-left: 4px;
}
.search-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(62,143,163,0.12); }
.nav-toggle { display: none; width: 38px; height: 38px; border-radius: 8px; align-items: center; justify-content: center; color: var(--text); font-size: 18px; }
.nav-toggle:hover { background: var(--primary-lighter); }
.mobile-cta { display: none; }

/* Hero */
.hero {
  min-height: 520px;
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  min-height: 520px;
  padding-top: 40px;
  padding-bottom: 40px;
}
.hero-content h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.hero-sub {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 480px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 32px; }
.hero-trust { display: flex; gap: 32px; flex-wrap: wrap; }
.trust-item { display: flex; flex-direction: column; }
.trust-item strong { font-size: 20px; font-weight: 700; color: var(--primary-dark); line-height: 1.3; }
.trust-item span { font-size: 13px; color: var(--text-light); }
.hero-visual { position: relative; }
.hero-visual img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  background: var(--primary-light);
}
.float-card {
  position: absolute;
  background: #fff;
  border-radius: var(--radius-md);
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  box-shadow: var(--shadow-float);
  border: 1px solid #EDF2F4;
}
.float-card i { color: var(--primary); font-size: 15px; }
.float-card-1 { bottom: 24px; left: -20px; }
.float-card-2 { top: 28px; right: -12px; }

/* Pain Points */
.pain-points { background: var(--bg); }
.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pain-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}
.pain-card:hover { box-shadow: var(--shadow-lg); border-color: var(--primary); transform: translateY(-3px); }
.pain-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1.5px solid var(--primary);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary);
  font-size: 17px;
  margin-bottom: 18px;
  transition: all var(--transition);
}
.pain-card:hover .pain-icon { background: var(--primary-light); }
.pain-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 10px; color: var(--text); }
.pain-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* Solutions */
.solutions { background: #fff; border-top: 1px solid var(--border); }
.solution-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: center;
  margin-bottom: 56px;
}
.solution-block:last-child { margin-bottom: 0; }
.solution-block.reverse .solution-img { order: 2; }
.solution-block.reverse .solution-text { order: 1; }
.solution-text h3 { font-size: 22px; font-weight: 600; color: var(--text); margin-bottom: 14px; line-height: 1.4; }
.solution-text p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 20px; }
.solution-img img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--primary-lighter);
  transition: box-shadow var(--transition);
}
.solution-img img:hover { box-shadow: var(--shadow-lg); }

/* Stats */
.stats { background: var(--primary-light); }
.section-head.light h2 { color: var(--primary-dark); }
.section-head.light p { color: var(--text-secondary); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 20px;
  text-align: center;
  border: 1px solid rgba(216,226,231,0.6);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.stat-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); border-color: var(--primary); }
.stat-num { font-size: 40px; font-weight: 700; color: var(--primary); line-height: 1.2; margin-bottom: 6px; }
.stat-label { font-size: 13px; color: var(--text-secondary); }

/* Testimonials */
.testimonials { background: var(--bg); }
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card {
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 28px;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.testimonial-card:hover { box-shadow: var(--shadow-lg); border-color: var(--primary); transform: translateY(-3px); }
.quote-mark { font-size: 48px; color: var(--primary-light); font-family: Georgia, serif; line-height: 1; margin-bottom: 4px; height: 30px; }
.testimonial-card p { font-size: 14px; color: var(--text-secondary); font-style: italic; line-height: 1.8; margin-bottom: 20px; min-height: 80px; }
.testimonial-user { display: flex; align-items: center; gap: 12px; }
.avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 600;
  flex-shrink: 0;
}
.testimonial-user strong { font-size: 14px; display: block; color: var(--text); }
.testimonial-user span { font-size: 13px; color: var(--text-light); }

/* News */
.news { background: #fff; border-top: 1px solid var(--border); }
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.news-card {
  display: flex;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.news-card:hover { box-shadow: var(--shadow-lg); border-color: var(--primary); transform: translateY(-2px); }
.news-thumb { flex-shrink: 0; }
.news-thumb img {
  width: 96px;
  height: 96px;
  object-fit: cover;
  border-radius: var(--radius-md);
  background: var(--primary-lighter);
  border: 1px solid var(--border);
}
.news-body { padding: 6px 0 0 16px; display: flex; flex-direction: column; flex: 1; min-width: 0; }
.news-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 8px;
  align-self: flex-start;
  white-space: nowrap;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}
.news-body h3 { font-size: 16px; font-weight: 600; color: var(--text); line-height: 1.4; margin-bottom: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-body > p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; flex: 1; }
.news-meta { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; }
.news-meta span { font-size: 13px; color: var(--text-light); }
.news-more { color: var(--primary) !important; font-weight: 500; }
.news-more:hover { color: var(--primary-dark) !important; text-decoration: underline; }
.news-empty {
  grid-column: 1 / -1;
  background: #fff;
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  color: var(--text-light);
  font-size: 14px;
}

/* FAQ */
.faq { background: var(--bg); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 0;
}
.faq-item:first-child { border-top: 1px solid var(--border); }
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  transition: color var(--transition);
}
.faq-question i { font-size: 14px; color: var(--text-light); transition: transform var(--transition); flex-shrink: 0; }
.faq-question:hover { color: var(--primary); }
.faq-item.active .faq-question { color: var(--primary); }
.faq-item.active .faq-question i { transform: rotate(45deg); color: var(--primary); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
  padding: 0;
}
.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 0 18px;
}
.faq-answer p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  background: var(--primary-light);
  border-radius: 8px;
  padding: 14px 16px;
}

/* Final CTA */
.final-cta {
  background: var(--primary-light);
  text-align: center;
  padding: 72px 0;
}
.final-cta h2 { font-size: 24px; font-weight: 600; color: var(--text); margin-bottom: 12px; }
.final-cta p { font-size: 15px; color: var(--text-secondary); margin-bottom: 28px; }

/* Footer */
.site-footer { background: #293840; color: rgba(255,255,255,0.7); font-size: 14px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 40px;
  padding: 56px 0 40px;
}
.footer-logo { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.footer-logo .logo-icon { background: var(--primary); }
.footer-brand p { font-size: 14px; line-height: 1.7; max-width: 260px; color: rgba(255,255,255,0.6); }
.footer-col h4 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: rgba(255,255,255,0.6); transition: all var(--transition); }
.footer-col ul li a:hover { color: #fff; text-decoration: underline; }
.footer-col ul li span { color: rgba(255,255,255,0.6); }
.footer-col ul li i { margin-right: 8px; color: var(--primary); font-size: 13px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* Responsive */
@media (max-width: 1024px) {
  .main-nav ul li a { padding: 6px 10px; font-size: 14px; }
  .hero-inner { gap: 32px; }
  .hero-content h1 { font-size: 28px; }
  .float-card-1 { left: -10px; }
  .float-card-2 { right: -6px; }
  .stat-num { font-size: 34px; }
}

@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .section-head { margin-bottom: 32px; }
  .section-head h2 { font-size: 21px; }
  .hero { min-height: auto; }
  .hero-inner { grid-template-columns: 1fr; gap: 32px; min-height: auto; padding-top: 40px; }
  .hero-content h1 { font-size: 26px; }
  .hero-sub { font-size: 15px; }
  .hero-visual img { aspect-ratio: 4/3; }
  .float-card-1 { left: 4px; bottom: 16px; }
  .float-card-2 { right: 4px; top: 16px; }
  
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 20px rgba(41,56,64,0.08);
    padding: 12px 24px 20px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s ease;
    z-index: 999;
  }
  .main-nav.open { opacity: 1; visibility: visible; transform: translateY(0); }
  .main-nav ul { flex-direction: column; gap: 0; }
  .main-nav ul li a { padding: 12px 0; font-size: 16px; border-bottom: 1px solid #F0F4F5; border-radius: 0; }
  .main-nav ul li a.active::after { display: none; }
  .main-nav ul li a:hover { background: transparent; color: var(--primary); }
  .mobile-cta { display: block; padding-top: 16px; }
  .mobile-cta .btn { width: 100%; }
  .search-wrap .search-input { display: none; }
  .search-wrap.open .search-input { display: block; width: 100%; position: absolute; right: 0; top: 44px; margin: 0; opacity: 1; }
  .header-right .btn-sm { display: none; }
  
  .pain-grid { grid-template-columns: 1fr; }
  .solution-block { grid-template-columns: 1fr; gap: 24px; }
  .solution-block.reverse .solution-img { order: 0; }
  .solution-block.reverse .solution-text { order: 1; }
  .solution-img img { aspect-ratio: 16/10; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat-num { font-size: 30px; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .testimonial-card p { min-height: auto; }
  .news-grid { grid-template-columns: 1fr; }
  .news-thumb img { width: 80px; height: 80px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; padding: 40px 0 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .pain-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .pain-card { padding: 20px; }
  .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonial-card p { min-height: 96px; }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-trust { gap: 24px; }
  .trust-item strong { font-size: 18px; }
  .stats-grid { gap: 12px; }
  .stat-card { padding: 24px 12px; }
  .news-card { flex-direction: column; }
  .news-thumb img { width: 100%; height: 140px; }
  .news-body { padding: 12px 0 0; }
}

/* roulang page: article */
:root{
  --primary:#3E8FA3;
  --primary-dark:#2F7186;
  --primary-light:#E3F0F4;
  --primary-lighter:#F0F7F9;
  --accent:#E09A3C;
  --accent-hover:#C9862E;
  --bg:#F6F8FA;
  --card-bg:#FFFFFF;
  --text-main:#293840;
  --text-sub:#5E6E77;
  --text-weak:#8A9AA3;
  --border:#D8E2E7;
  --radius-lg:16px;
  --radius-md:12px;
  --radius-sm:8px;
  --shadow-sm:0 2px 8px rgba(41,56,64,0.04);
  --shadow-md:0 10px 28px rgba(41,56,64,0.08);
  --container:1200px;
  --font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:var(--font-family);
  background:var(--bg);
  color:var(--text-main);
  line-height:1.6;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--primary);text-decoration:none;transition:color .25s ease;}
a:hover{color:var(--primary-dark);}
button{font-family:inherit;cursor:pointer;}
input{font-family:inherit;}
ul,ol{list-style:none;}
.container{max-width:var(--container);margin:0 auto;padding:0 24px;}

/* ===== Header ===== */
.site-header{
  background:#fff;
  border-bottom:1px solid var(--border);
  height:64px;
  position:fixed;
  top:0;left:0;right:0;
  z-index:1000;
  transition:box-shadow .3s ease;
}
.site-header.scrolled{box-shadow:0 2px 12px rgba(41,56,64,.06);}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;
}
.header-left{display:flex;align-items:center;gap:32px;}
.logo{
  display:flex;align-items:center;gap:10px;
  font-weight:700;font-size:20px;color:var(--primary-dark);
  white-space:nowrap;
}
.logo-icon{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;background:var(--primary);color:#fff;
  border-radius:10px;font-size:18px;font-weight:700;
  flex-shrink:0;
}
.logo-text{line-height:1;}
.main-nav ul{display:flex;gap:8px;}
.main-nav a{
  display:block;padding:8px 16px;
  color:var(--text-main);font-size:15px;font-weight:500;
  border-radius:8px;position:relative;
  transition:color .25s ease,background .25s ease;
}
.main-nav a:hover{color:var(--primary);background:var(--primary-lighter);}
.main-nav a.active{color:var(--primary);font-weight:600;}
.main-nav a.active::after{
  content:'';position:absolute;left:16px;right:16px;bottom:0;
  height:2px;background:var(--primary);border-radius:2px;
}
.header-right{display:flex;align-items:center;gap:16px;}
.search-wrap{position:relative;display:flex;align-items:center;}
.search-btn{
  background:none;border:none;width:40px;height:40px;
  color:var(--text-sub);font-size:16px;border-radius:8px;
  transition:background .25s ease,color .25s ease;
}
.search-btn:hover{background:var(--primary-lighter);color:var(--primary);}
.search-input{
  display:none;position:absolute;right:0;top:100%;
  width:280px;padding:12px 16px;margin-top:8px;
  border:1px solid var(--border);border-radius:12px;
  background:#fff;box-shadow:var(--shadow-md);
  font-size:14px;outline:none;
}
.search-input:focus{border-color:var(--primary);}
.search-wrap.open .search-input{display:block;}
.search-wrap.open .search-btn{color:var(--primary);}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 32px;border-radius:8px;
  font-size:15px;font-weight:600;border:none;
  transition:all .25s ease;text-align:center;line-height:1.2;
}
.btn-primary{background:var(--accent);color:#fff !important;}
.btn-primary:hover{
  background:var(--accent-hover);
  transform:translateY(-2px);
  box-shadow:0 6px 20px rgba(224,154,60,.3);
}
.btn-outline{
  background:transparent;border:1px solid var(--primary);
  color:var(--primary);padding:12px 32px;
  border-radius:8px;font-size:15px;font-weight:600;
  transition:all .25s ease;
}
.btn-outline:hover{background:var(--primary-light);color:var(--primary-dark);}
.btn-sm{padding:8px 20px;font-size:14px;}
.nav-toggle{
  display:none;background:none;border:none;
  font-size:20px;color:var(--text-main);
  width:40px;height:40px;border-radius:8px;
  align-items:center;justify-content:center;
}
.nav-toggle:hover{background:var(--primary-lighter);}
.mobile-cta{display:none;}

/* ===== Page main ===== */
.page-main{padding-top:64px;}

/* ===== Breadcrumb ===== */
.breadcrumb{
  background:#fff;
  border-bottom:1px solid var(--border);
  padding:16px 0;
  margin-bottom:40px;
}
.breadcrumb-list{
  display:flex;align-items:center;flex-wrap:wrap;
  gap:8px;font-size:13px;color:var(--text-weak);
}
.breadcrumb-list a{color:var(--text-weak);}
.breadcrumb-list a:hover{color:var(--primary);}
.breadcrumb-list li{display:flex;align-items:center;gap:8px;}
.breadcrumb-list li:not(:last-child)::after{content:'/';color:var(--border);}
.breadcrumb-list li.current{color:var(--text-sub);max-width:300px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}

/* ===== Article Section ===== */
.article-section{padding:32px 0 32px;}
.article-header{
  max-width:760px;margin:0 auto 40px;
  text-align:center;
}
.article-category{
  display:inline-block;
  background:var(--primary-light);color:var(--primary);
  font-size:12px;font-weight:600;
  padding:4px 14px;border-radius:4px;
  margin-bottom:16px;
}
.article-header h1{
  font-size:32px;font-weight:700;line-height:1.3;
  color:var(--text-main);margin-bottom:18px;
  word-break:break-word;
}
.article-meta{
  display:flex;align-items:center;justify-content:center;
  gap:20px;font-size:13px;color:var(--text-weak);
}
.article-meta i{margin-right:5px;}

.article-body{
  max-width:760px;margin:0 auto;
  background:#fff;
  padding:48px;
  border-radius:var(--radius-lg);
  border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
}
.article-body h2{
  font-size:22px;font-weight:600;
  margin:32px 0 16px;color:var(--text-main);
  line-height:1.4;
}
.article-body h3{
  font-size:18px;font-weight:600;
  margin:24px 0 12px;color:var(--text-main);
  line-height:1.4;
}
.article-body p{
  font-size:16px;line-height:1.9;color:var(--text-sub);
  margin-bottom:20px;
}
.article-body img{
  border-radius:12px;border:1px solid var(--border);
  margin:24px auto;
}
.article-body blockquote{
  border-left:3px solid var(--primary);
  background:var(--primary-lighter);
  padding:16px 20px;border-radius:8px;
  color:var(--text-sub);margin:24px 0;
  line-height:1.8;font-style:italic;
}
.article-body ul,.article-body ol{
  margin:16px 0 20px;padding-left:24px;
  color:var(--text-sub);
}
.article-body li{margin-bottom:8px;line-height:1.8;}
.article-body li::marker{color:var(--primary);}
.article-body a{color:var(--primary);font-weight:500;}
.article-body a:hover{color:var(--primary-dark);text-decoration:underline;}

.article-not-found{
  max-width:760px;margin:0 auto;
  background:#fff;padding:56px 32px;
  border-radius:var(--radius-lg);
  border:1px dashed var(--border);
  text-align:center;
}
.article-not-found h2{
  font-size:20px;font-weight:600;color:var(--text-main);
  margin-bottom:12px;
}
.article-not-found p{
  font-size:14px;color:var(--text-weak);
  margin-bottom:20px;
}
.article-not-found .btn{margin-top:8px;}

/* ===== Related ===== */
.related-section{padding:48px 0 64px;}
.related-section .section-title{
  font-size:24px;font-weight:600;text-align:center;
  margin-bottom:36px;color:var(--text-main);
}
.related-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
.related-card{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  overflow:hidden;
  transition:all .25s ease;
  display:block;
}
.related-card:hover{
  box-shadow:var(--shadow-md);
  border-color:var(--primary);
  transform:translateY(-4px);
}
.related-card img{
  width:100%;height:160px;object-fit:cover;
  border-bottom:1px solid var(--border);
}
.related-card .related-body{padding:20px;}
.related-card h3{
  font-size:16px;font-weight:600;
  margin-bottom:8px;line-height:1.4;
}
.related-card h3 a{color:var(--text-main);}
.related-card h3 a:hover{color:var(--primary);}
.related-card p{
  font-size:14px;color:var(--text-weak);line-height:1.6;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
  overflow:hidden;
}

/* ===== Back Link ===== */
.back-link-wrap{
  max-width:760px;margin:32px auto 0;text-align:center;
}
.back-link{
  display:inline-flex;align-items:center;gap:8px;
  color:var(--primary);font-size:14px;font-weight:500;
  padding:10px 20px;border-radius:8px;
  transition:background .25s ease,color .25s ease;
}
.back-link:hover{
  color:var(--primary-dark);background:var(--primary-lighter);
  text-decoration:none;
}

/* ===== CTA ===== */
.cta-section{
  background:var(--primary-light);
  padding:56px 0;
}
.cta-inner{
  text-align:center;max-width:640px;margin:0 auto;
}
.cta-inner h2{
  font-size:24px;font-weight:600;color:var(--text-main);
  margin-bottom:12px;
}
.cta-inner p{
  font-size:15px;color:var(--text-sub);
  margin-bottom:28px;
}

/* ===== Footer ===== */
.site-footer{
  background:#293840;color:#B8C4CC;
  padding:60px 0 0;
}
.footer-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;padding-bottom:48px;
}
.footer-brand .footer-logo{
  display:flex;align-items:center;gap:10px;
  font-size:20px;font-weight:700;color:#fff;
  margin-bottom:16px;
}
.footer-brand p{
  font-size:14px;line-height:1.8;color:#9AA8AF;
}
.footer-col h4{
  font-size:15px;font-weight:600;color:#fff;
  margin-bottom:16px;
}
.footer-col ul li{
  margin-bottom:8px;font-size:14px;
}
.footer-col ul a{color:#B8C4CC;}
.footer-col ul a:hover{color:#fff;text-decoration:underline;}
.footer-col i{margin-right:6px;color:var(--primary);}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding:20px 0;
  display:flex;justify-content:space-between;
  font-size:13px;color:#9AA8AF;
}

/* ===== Focus states ===== */
a:focus-visible,.btn:focus-visible,button:focus-visible,.search-input:focus-visible{
  outline:2px solid rgba(62,143,163,.4);
  outline-offset:2px;
}

/* ===== Responsive ===== */
@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr;}
  .related-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:768px){
  .nav-toggle{display:flex;}
  .header-left .main-nav{
    position:fixed;top:64px;left:0;right:0;
    background:#fff;border-bottom:1px solid var(--border);
    padding:16px 24px;display:none;
    box-shadow:0 12px 24px rgba(41,56,64,.08);
  }
  .header-left .main-nav.open{display:block;}
  .main-nav ul{flex-direction:column;gap:4px;}
  .main-nav a{padding:12px 16px;font-size:16px;}
  .main-nav a.active::after{display:none;}
  .main-nav a.active{background:var(--primary-light);border-radius:8px;}
  .header-right .btn-sm{display:none;}
  .mobile-cta{display:block;padding-top:12px;}
  .mobile-cta .btn{width:100%;}
  .article-header h1{font-size:26px;}
  .article-body{padding:28px 20px;}
  .breadcrumb{margin-bottom:24px;}
  .article-section{padding:16px 0 32px;}
  .related-section{padding:32px 0 48px;}
  .related-grid{grid-template-columns:1fr;gap:16px;}
  .cta-section{padding:40px 0;}
  .cta-inner h2{font-size:21px;}
  .footer-grid{grid-template-columns:1fr;gap:24px;}
  .footer-bottom{flex-direction:column;gap:8px;text-align:center;}
  .article-meta{flex-wrap:wrap;gap:12px;}
  .breadcrumb-list li.current{max-width:180px;}
}
@media (min-width:769px) and (max-width:1024px){
  .related-grid{grid-template-columns:repeat(2,1fr);}
}

/* roulang page: category1 */
:root {
  --primary: #3E8FA3;
  --primary-dark: #2F7186;
  --primary-light: #E3F0F4;
  --primary-lighter: #F0F7F9;
  --accent: #E09A3C;
  --accent-dark: #C9862E;
  --bg: #F6F8FA;
  --card: #FFFFFF;
  --text-main: #293840;
  --text-sub: #5E6E77;
  --text-weak: #8A9AA3;
  --border: #D8E2E7;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 2px 8px rgba(41,56,64,0.04);
  --shadow-hover: 0 10px 28px rgba(41,56,64,0.08);
  --container: 1200px;
  --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-stack);
  background: var(--bg);
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--primary);
  text-decoration: none;
  transition: color .25s ease;
}
a:hover {
  color: var(--primary-dark);
}
ul, ol {
  list-style: none;
}
button {
  font-family: inherit;
  cursor: pointer;
}
input {
  font-family: inherit;
}
:focus-visible {
  outline: 2px solid rgba(62,143,163,0.4);
  outline-offset: 2px;
}
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: all .25s ease;
  text-decoration: none;
  line-height: 1.4;
}
.btn-accent {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-accent:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #fff;
  transform: translateY(-1px);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}
.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
}
/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 64px;
  background: #fff;
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s ease;
}
.site-header.scrolled {
  box-shadow: 0 2px 12px rgba(41,56,64,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.header-left {
  display: flex;
  align-items: center;
  gap: 40px;
}
.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  font-weight: 700;
  font-size: 18px;
  line-height: 1;
}
.logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary-dark);
  white-space: nowrap;
}
.main-nav ul {
  display: flex;
  gap: 32px;
}
.main-nav a {
  display: block;
  padding: 20px 0 17px;
  color: var(--text-sub);
  font-size: 15px;
  font-weight: 500;
  border-bottom: 3px solid transparent;
  transition: color .2s, border-color .2s;
}
.main-nav a:hover {
  color: var(--primary);
}
.main-nav a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}
.search-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
}
.search-btn {
  background: none;
  border: none;
  color: var(--text-sub);
  font-size: 16px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  transition: color .2s, background .2s;
}
.search-btn:hover {
  color: var(--primary);
  background: var(--primary-lighter);
}
.search-input {
  width: 0;
  opacity: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 0;
  font-size: 14px;
  background: #fff;
  transition: width .3s ease, opacity .3s ease, padding .3s ease;
  pointer-events: none;
}
.search-wrap.open .search-input {
  width: 180px;
  opacity: 1;
  padding: 6px 12px;
  pointer-events: auto;
}
.search-input::placeholder {
  color: var(--text-weak);
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-main);
  padding: 6px 8px;
  border-radius: var(--radius-sm);
}
.mobile-cta {
  display: none;
}
/* ===== Category Hero ===== */
.cat-hero {
  background: linear-gradient(135deg, #EFF5F7 0%, #F9FBFC 55%, #E8F0F3 100%);
  border-bottom: 1px solid var(--border);
  padding: 64px 0 56px;
}
.cat-hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.cat-hero h1 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 14px;
}
.hero-sub {
  font-size: 16px;
  color: var(--text-sub);
  line-height: 1.8;
  max-width: 480px;
  margin-bottom: 28px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.hero-metrics {
  display: flex;
  gap: 32px;
}
.hero-metric {
  display: flex;
  flex-direction: column;
}
.hero-metric strong {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}
.hero-metric span {
  font-size: 13px;
  color: var(--text-weak);
  margin-top: 2px;
}
.cat-hero-image {
  position: relative;
}
.cat-hero-image img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  background: var(--primary-light);
}
.floating-card {
  position: absolute;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px rgba(41,56,64,0.10);
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}
.floating-card i {
  color: var(--accent);
  font-size: 15px;
}
.card-1 {
  bottom: 24px;
  left: -12px;
}
.card-2 {
  top: 24px;
  right: -12px;
}
/* ===== Pain Section ===== */
.pain-section {
  padding: 80px 0;
}
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}
.section-header .section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.section-header h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 12px;
}
.section-header p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.7;
}
.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.pain-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  transition: box-shadow .25s ease, border-color .25s ease, transform .25s ease;
}
.pain-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
  transform: translateY(-4px);
}
.pain-icon {
  width: 48px;
  height: 48px;
  border: 1.5px solid var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 20px;
  margin-bottom: 20px;
}
.pain-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-main);
}
.pain-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-sub);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}
.pain-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
}
.pain-link:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}
/* ===== Solution Alternate ===== */
.solution-section {
  background: var(--card);
  padding: 80px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.solution-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 40px 0;
}
.solution-block.reverse {
  direction: rtl;
}
.solution-block.reverse > * {
  direction: ltr;
}
.solution-text .sol-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-dark);
  background: #FBF1E1;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.solution-text h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 14px;
}
.solution-text p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-sub);
  margin-bottom: 18px;
}
.solution-features {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}
.solution-features span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-lighter);
  border: 1px solid #E1EDF1;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 999px;
}
.solution-features span i {
  font-size: 12px;
  color: var(--primary);
}
.solution-image img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  background: var(--primary-light);
}
/* ===== Industry Cards ===== */
.industry-cards-section {
  padding: 80px 0;
}
.industry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.industry-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow .25s ease, transform .25s ease, border-color .25s ease;
}
.industry-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: var(--primary);
}
.industry-card .card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--primary-light);
}
.industry-card .card-body {
  padding: 24px;
}
.industry-card .card-body h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}
.industry-card .card-body p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}
.card-link:hover {
  color: var(--primary-dark);
  gap: 10px;
}
/* ===== Process Section ===== */
.process-section {
  background: var(--primary-lighter);
  padding: 80px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.process-step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  box-shadow: var(--shadow-card);
  transition: box-shadow .25s ease, transform .25s ease;
}
.process-step:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.step-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary-light);
  line-height: 1;
  margin-bottom: 14px;
  display: block;
}
.process-step h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}
.process-step p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}
/* ===== Stats Section ===== */
.stats-section {
  padding: 80px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  text-align: center;
  box-shadow: var(--shadow-card);
}
.stat-number {
  font-size: 40px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 6px;
}
.stat-number span {
  font-size: 24px;
  color: var(--accent);
}
.stat-label {
  font-size: 14px;
  color: var(--text-sub);
}
/* ===== FAQ Section ===== */
.faq-section {
  padding: 80px 0;
  background: var(--card);
  border-top: 1px solid var(--border);
}
.faq-list {
  max-width: 840px;
  margin: 0 auto;
}
.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-item:first-child {
  border-top: 1px solid var(--border);
}
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  transition: color .2s;
}
.faq-question:hover {
  color: var(--primary);
}
.faq-question i {
  color: var(--text-weak);
  font-size: 14px;
  transition: transform .3s ease, color .3s;
}
.faq-item.open .faq-question i {
  transform: rotate(45deg);
  color: var(--primary);
}
.faq-answer {
  display: none;
  padding: 0 18px 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-sub);
  background: var(--primary-light);
  border-radius: 8px;
  margin-bottom: 16px;
}
.faq-item.open .faq-answer {
  display: block;
}
/* ===== Final CTA ===== */
.final-cta {
  padding: 80px 0;
  background: var(--primary-light);
}
.cta-box {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}
.cta-box h2 {
  font-size: 26px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.4;
}
.cta-box p {
  font-size: 15px;
  color: var(--text-sub);
  margin-bottom: 28px;
}
.cta-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
/* ===== Footer ===== */
.site-footer {
  background: #293840;
  color: #C7D2D8;
  padding: 56px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: #9FAEB6;
  max-width: 260px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul li {
  margin-bottom: 10px;
  font-size: 14px;
}
.footer-col ul li a {
  color: #9FAEB6;
  text-decoration: none;
  transition: color .2s;
}
.footer-col ul li a:hover {
  color: #fff;
  text-decoration: underline;
}
.footer-col ul li i {
  width: 18px;
  color: var(--accent);
  margin-right: 4px;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 18px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: #7E8E96;
}
/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .solution-block {
    gap: 40px;
  }
}
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  .header-inner {
    height: 60px;
  }
  .header-left {
    gap: 12px;
  }
  .main-nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 24px rgba(41,56,64,0.08);
    display: none;
    padding: 16px 24px 24px;
  }
  .main-nav.open {
    display: block;
  }
  .main-nav ul {
    flex-direction: column;
    gap: 0;
  }
  .main-nav a {
    padding: 14px 0;
    border-bottom: 1px solid #EEF2F5;
    border-bottom-color: #EEF2F5;
  }
  .main-nav a.active {
    border-bottom: 2px solid var(--primary);
    color: var(--primary);
  }
  .mobile-cta {
    display: block;
    margin-top: 16px;
  }
  .btn-sm {
    display: none;
  }
  .nav-toggle {
    display: block;
  }
  .search-btn {
    display: none;
  }
  .cat-hero {
    padding: 40px 0 48px;
  }
  .cat-hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .cat-hero h1 {
    font-size: 28px;
  }
  .hero-metrics {
    gap: 20px;
  }
  .floating-card {
    display: none;
  }
  .pain-section,
  .solution-section,
  .industry-cards-section,
  .process-section,
  .stats-section,
  .faq-section,
  .final-cta {
    padding: 48px 0;
  }
  .pain-grid,
  .industry-grid,
  .stats-grid,
  .process-grid {
    grid-template-columns: 1fr;
  }
  .section-header {
    margin-bottom: 32px;
  }
  .solution-block {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 0;
  }
  .solution-block.reverse {
    direction: ltr;
  }
  .solution-image img,
  .industry-card .card-img {
    height: 220px;
  }
  .cat-hero-image img {
    aspect-ratio: 16/10;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 4px;
    text-align: center;
  }
  .hero-actions .btn {
    flex: 1;
    min-width: 140px;
  }
  .cta-actions .btn {
    flex: 1;
  }
}
@media (max-width: 520px) {
  .hero-metrics {
    gap: 14px;
    flex-wrap: wrap;
  }
  .hero-metric strong {
    font-size: 24px;
  }
  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .section-header h2 {
    font-size: 21px;
  }
}

/* roulang page: category2 */
:root {
            --primary: #3E8FA3;
            --primary-dark: #2F7186;
            --primary-light: #E3F0F4;
            --primary-lighter: #F0F7F9;
            --accent: #E09A3C;
            --accent-dark: #C9862E;
            --bg: #F6F8FA;
            --card: #FFFFFF;
            --text-main: #293840;
            --text-secondary: #5E6E77;
            --text-weak: #8A9AA3;
            --border: #D8E2E7;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-card: 0 2px 8px rgba(41, 56, 64, 0.04);
            --shadow-hover: 0 10px 28px rgba(41, 56, 64, 0.08);
            --transition: 0.25s ease;
            --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

        img {
            max-width: 100%;
            display: block;
            border-radius: var(--radius-md);
        }

        ul,
        ol {
            list-style: none;
        }

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

        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            height: 64px;
            background: var(--card);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }

        .site-header.scrolled {
            box-shadow: 0 2px 12px rgba(41, 56, 64, 0.06);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 24px;
        }

        .header-left {
            display: flex;
            align-items: center;
            gap: 32px;
            flex: 1;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            background: var(--primary-dark);
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            border-radius: 8px;
            line-height: 1;
        }

        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.5px;
        }

        .main-nav ul {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .main-nav a {
            display: inline-block;
            padding: 20px 0 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-bottom: 2px solid transparent;
            line-height: 28px;
            transition: color var(--transition), border-color var(--transition);
        }

        .main-nav a:hover {
            color: var(--primary);
        }

        .main-nav a.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
            font-weight: 600;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .search-wrap {
            position: relative;
            display: flex;
            align-items: center;
        }

        .search-btn {
            background: none;
            border: none;
            font-size: 16px;
            color: var(--text-secondary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: color var(--transition), background var(--transition);
        }

        .search-btn:hover {
            color: var(--primary);
            background: var(--primary-lighter);
        }

        .search-input {
            width: 0;
            opacity: 0;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 0;
            font-size: 14px;
            font-family: var(--font);
            transition: width var(--transition), opacity var(--transition), padding var(--transition);
            outline: none;
            background: var(--card);
            color: var(--text-main);
        }

        .search-input.open {
            width: 180px;
            opacity: 1;
            padding: 7px 12px;
            margin-left: 8px;
        }

        .search-input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(62, 143, 163, 0.15);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 600;
            font-family: var(--font);
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
            outline: none;
            text-align: center;
            line-height: 1.4;
        }

        .btn-sm {
            padding: 8px 20px;
            font-size: 14px;
        }

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

        .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(224, 154, 60, 0.3);
        }

        .btn-primary:focus-visible {
            outline: 2px solid rgba(62, 143, 163, 0.4);
            outline-offset: 2px;
        }

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

        .btn-accent:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(224, 154, 60, 0.3);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 22px;
            color: var(--text-main);
            cursor: pointer;
            padding: 6px;
            border-radius: var(--radius-sm);
            transition: color var(--transition), background var(--transition);
        }

        .nav-toggle:hover {
            color: var(--primary);
            background: var(--primary-lighter);
        }

        .mobile-cta {
            display: none;
        }

        .page-banner {
            position: relative;
            background-size: cover;
            background-position: center;
            padding: 88px 0 92px;
        }

        .banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(41, 56, 64, 0.88) 0%, rgba(62, 143, 163, 0.72) 100%);
        }

        .banner-content {
            position: relative;
            z-index: 2;
            max-width: 760px;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 20px;
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
        }

        .breadcrumb a:hover {
            color: #fff;
        }

        .breadcrumb .sep {
            opacity: 0.6;
        }

        .page-banner h1 {
            font-size: 36px;
            font-weight: 700;
            color: #fff;
            line-height: 1.3;
            margin-bottom: 16px;
        }

        .page-banner p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.9);
            line-height: 1.8;
            max-width: 640px;
        }

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

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

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

        .split-item.reverse .split-text {
            order: 2;
        }

        .split-item.reverse .split-media {
            order: 1;
        }

        .section-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary-dark);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

        .split-text h2 {
            font-size: 24px;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 20px;
            color: var(--text-main);
        }

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

        .text-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            margin-top: 8px;
            transition: color var(--transition);
        }

        .text-link:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        .text-link i {
            font-size: 13px;
        }

        .split-media {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
        }

        .split-media img {
            width: 100%;
            height: 320px;
            object-fit: cover;
            border-radius: 0;
        }

        .process-list {
            margin-top: 24px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }

        .process-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 16px;
            box-shadow: var(--shadow-card);
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        .process-list li:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
        }

        .process-list .step-num {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
            flex-shrink: 0;
        }

        .process-list .step-text strong {
            display: block;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 2px;
        }

        .process-list .step-text span {
            font-size: 13px;
            color: var(--text-weak);
            line-height: 1.5;
            display: block;
        }

        .cards-section {
            padding: 80px 0;
            background: var(--card);
        }

        .cards-section .section-tag,
        .faq-section .section-tag,
        .cta-section .section-tag {
            display: inline-block;
        }

        .cards-section h2,
        .faq-section h2 {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--text-main);
        }

        .section-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 680px;
            margin-bottom: 40px;
        }

        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .card-item {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
            display: flex;
            flex-direction: column;
        }

        .card-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .card-item img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
            border-bottom: 1px solid var(--border);
        }

        .card-item .card-body {
            padding: 24px 24px 28px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .card-item h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 10px;
        }

        .card-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 16px;
        }

        .card-item .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color var(--transition);
        }

        .card-item .card-link:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        .faq-section {
            padding: 80px 0;
            background: var(--bg);
        }

        .faq-list {
            max-width: 820px;
            margin-top: 36px;
        }

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

        .faq-item:first-child {
            border-top: 1px solid var(--border);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            background: none;
            border: none;
            padding: 20px 0;
            font-size: 16px;
            font-weight: 600;
            font-family: var(--font);
            color: var(--text-main);
            cursor: pointer;
            text-align: left;
            transition: color var(--transition);
            outline: none;
        }

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

        .faq-question .faq-icon {
            font-size: 20px;
            font-weight: 300;
            color: var(--text-weak);
            transition: transform var(--transition), color var(--transition);
            flex-shrink: 0;
            margin-left: 16px;
        }

        .faq-item.open .faq-question {
            color: var(--primary);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--primary);
        }

        .faq-answer {
            display: none;
            padding: 0 0 20px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .faq-item.open .faq-answer {
            display: block;
            background: var(--primary-light);
            border-radius: var(--radius-sm);
            padding: 16px 20px;
            margin-bottom: 20px;
        }

        .cta-section {
            padding: 72px 0;
            background: var(--primary-light);
            text-align: center;
        }

        .cta-section .container {
            max-width: 720px;
        }

        .cta-section h2 {
            font-size: 24px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 28px;
            line-height: 1.8;
        }

        .site-footer {
            background: #293840;
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 0;
        }

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

        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
            color: #fff;
            font-size: 18px;
            font-weight: 700;
        }

        .footer-brand .footer-logo .logo-icon {
            background: var(--primary);
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.7);
            max-width: 280px;
        }

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

        .footer-col ul li {
            margin-bottom: 10px;
            font-size: 14px;
        }

        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.7);
            transition: color var(--transition);
        }

        .footer-col ul li a:hover {
            color: #fff;
            text-decoration: underline;
        }

        .footer-col ul li i {
            margin-right: 8px;
            color: var(--primary);
            width: 16px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
        }

        @media (max-width: 1024px) {
            .header-left {
                gap: 20px;
            }
            .main-nav ul {
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }

            .header-inner {
                gap: 12px;
            }

            .header-left {
                gap: 12px;
                flex: 1;
            }

            .main-nav {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--card);
                border-bottom: 1px solid var(--border);
                box-shadow: 0 8px 24px rgba(41, 56, 64, 0.08);
                padding: 16px 24px 24px;
                transform: translateY(-16px);
                opacity: 0;
                visibility: hidden;
                transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
                z-index: 999;
            }

            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }

            .main-nav ul {
                flex-direction: column;
                align-items: stretch;
                gap: 0;
            }

            .main-nav ul li a {
                display: block;
                padding: 14px 0;
                border-bottom: 1px solid var(--border);
                border-bottom-width: 1px;
                font-size: 16px;
                line-height: 24px;
            }

            .main-nav ul li a.active {
                border-bottom-color: var(--border);
                color: var(--primary);
                font-weight: 600;
                position: relative;
                padding-left: 12px;
            }

            .main-nav ul li a.active::before {
                content: '';
                position: absolute;
                left: 0;
                top: 50%;
                transform: translateY(-50%);
                width: 4px;
                height: 20px;
                background: var(--primary);
                border-radius: 2px;
            }

            .mobile-cta {
                display: block;
                margin-top: 20px;
            }

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

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

            .header-right .btn-sm {
                display: none;
            }

            .search-input.open {
                width: 120px;
            }

            .page-banner {
                padding: 56px 0 60px;
            }

            .page-banner h1 {
                font-size: 26px;
            }

            .page-banner p {
                font-size: 15px;
            }

            .split-section {
                padding: 48px 0;
            }

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

            .split-item.reverse .split-text {
                order: 1;
            }

            .split-item.reverse .split-media {
                order: 2;
            }

            .split-text h2 {
                font-size: 21px;
            }

            .split-media img {
                height: 220px;
            }

            .process-list {
                grid-template-columns: 1fr 1fr;
            }

            .cards-section {
                padding: 48px 0;
            }

            .cards-section h2,
            .faq-section h2 {
                font-size: 21px;
            }

            .card-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .faq-section {
                padding: 48px 0;
            }

            .faq-question {
                font-size: 15px;
            }

            .cta-section {
                padding: 48px 0;
            }

            .cta-section h2 {
                font-size: 21px;
            }

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

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 480px) {
            .logo-text {
                font-size: 16px;
            }

            .search-input.open {
                width: 100px;
            }

            .process-list {
                grid-template-columns: 1fr;
            }

            .card-item img {
                height: 160px;
            }
        }

        @media (min-width: 769px) and (max-width: 1024px) {
            .split-item {
                gap: 32px;
            }

            .split-media img {
                height: 260px;
            }

            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }