/* roulang page: index */
:root {
  --brand-blue: #2E7CF6;
  --brand-blue-deep: #1C5FD1;
  --brand-blue-light: #EBF2FE;
  --accent-amber: #F5A524;
  --accent-amber-deep: #D97E00;
  --success-green: #21A35E;
  --text-primary: #17233A;
  --text-secondary: #5A6B83;
  --text-weak: #8A97AC;
  --bg-white: #FFFFFF;
  --bg-gray: #F5F8FC;
  --border-color: #E1E8F0;
  --dark-bg: #14283F;
  --font-main: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
  --font-num: Inter, "Helvetica Neue", Arial, sans-serif;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --shadow-1: 0 1px 3px rgba(23,35,58,.06), 0 2px 8px rgba(23,35,58,.05);
  --shadow-2: 0 8px 24px rgba(23,35,58,.10), 0 2px 8px rgba(23,35,58,.06);
  --transition: .25s ease;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: var(--brand-blue); transition: color var(--transition); }
a:hover { color: var(--brand-blue-deep); }
button { font-family: var(--font-main); }
.container { max-width: 1200px; padding-left: 24px; padding-right: 24px; }
.section { padding: 96px 0; }
.bg-gray { background: var(--bg-gray); }
.section-header { margin-bottom: 48px; display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.section-header h2 { font-size: 26px; font-weight: 700; line-height: 1.4; margin: 0 0 8px; }
.section-header .section-sub { font-size: 15px; color: var(--text-secondary); margin: 0; }
.more-link { font-size: 14px; font-weight: 500; color: var(--brand-blue); padding: 8px 16px; border: 1px solid var(--border-color); border-radius: 999px; transition: all var(--transition); white-space: nowrap; }
.more-link:hover { background: var(--brand-blue-light); border-color: var(--brand-blue); color: var(--brand-blue-deep); }
.btn { border-radius: var(--radius-sm); font-weight: 600; letter-spacing: .5px; transition: all var(--transition); }
.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--brand-blue);
  outline-offset: 2px;
}
.btn-download {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  background: var(--accent-amber); color: #fff; border: none;
  height: 56px; padding: 0 32px; min-width: 220px; border-radius: 12px;
  font-size: 16px; font-weight: 600; box-shadow: var(--shadow-1);
}
.btn-download:hover { background: var(--accent-amber-deep); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-2); }
.btn-download:active { transform: scale(.98); }
.btn-outline-blue {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--bg-white); color: var(--brand-blue); border: 1.5px solid var(--brand-blue);
  height: 48px; padding: 0 28px; border-radius: var(--radius-sm); font-size: 15px; font-weight: 600;
}
.btn-outline-blue:hover { background: var(--brand-blue-light); color: var(--brand-blue-deep); }
.btn-primary-blue {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--brand-blue); color: #fff; border: none;
  height: 44px; padding: 0 24px; border-radius: var(--radius-sm); font-size: 15px; font-weight: 500;
}
.btn-primary-blue:hover { background: var(--brand-blue-deep); color: #fff; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  background: var(--bg-white);
  box-shadow: var(--shadow-1);
}
.site-header .navbar { padding: 0; min-height: 72px; }
.site-header .navbar-brand { display: flex; align-items: center; gap: 10px; padding: 0; }
.brand-logo { display: flex; align-items: center; gap: 10px; }
.brand-icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--brand-blue); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.brand-text { font-size: 20px; font-weight: 700; color: var(--text-primary); letter-spacing: .5px; }
.site-header .navbar-nav { gap: 8px; }
.site-header .nav-link {
  font-size: 15px; font-weight: 500; color: var(--text-secondary);
  padding: 10px 18px !important; border-radius: 8px; position: relative;
  transition: color var(--transition), background var(--transition);
}
.site-header .nav-link:hover { color: var(--brand-blue); background: var(--brand-blue-light); }
.site-header .nav-link.active { color: var(--brand-blue); font-weight: 600; }
.site-header .nav-link.active::after {
  content: ""; position: absolute; left: 18px; right: 18px; bottom: 2px;
  height: 2px; background: var(--brand-blue); border-radius: 2px;
}
.nav-actions { display: flex; align-items: center; gap: 16px; }
.mega-trigger { position: relative; }
.mega-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: transparent; border: 1px solid var(--border-color);
  border-radius: 999px; padding: 8px 18px;
  font-size: 14px; font-weight: 500; color: var(--text-primary);
  transition: all var(--transition);
}
.mega-btn:hover { border-color: var(--brand-blue); color: var(--brand-blue); background: var(--brand-blue-light); }
.btn-download-small {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--accent-amber); color: #fff; border: none;
  height: 36px; padding: 0 20px; border-radius: 999px;
  font-size: 14px; font-weight: 600; transition: all var(--transition);
}
.btn-download-small:hover { background: var(--accent-amber-deep); color: #fff; transform: translateY(-1px); }
.mega-menu {
  min-width: 720px !important; padding: 24px !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 16px !important;
  box-shadow: var(--shadow-2) !important;
  inset: calc(100% + 12px) 0 auto auto !important;
  transition: opacity var(--transition), transform var(--transition);
}
.mega-menu::before {
  content: ""; position: absolute; top: -8px; right: 32px;
  width: 16px; height: 16px; background: #fff;
  border-left: 1px solid var(--border-color); border-top: 1px solid var(--border-color);
  transform: rotate(45deg);
}
.mega-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
.mega-col h4 { font-size: 14px; font-weight: 600; color: var(--text-weak); margin: 0 0 12px; letter-spacing: 1px; text-transform: uppercase; }
.mega-col a.mega-link {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 8px;
  font-size: 14px; font-weight: 500; color: var(--text-primary);
  transition: background var(--transition);
}
.mega-col a.mega-link:hover { background: var(--brand-blue-light); color: var(--brand-blue-deep); }
.mega-col a.mega-link i { width: 20px; text-align: center; color: var(--brand-blue); }
.mega-post-link {
  display: block; padding: 10px 12px; border-radius: 10px;
  background: var(--bg-gray); margin-bottom: 8px;
  transition: background var(--transition);
}
.mega-post-link:hover { background: var(--brand-blue-light); }
.mega-post-link span { display: block; font-size: 14px; font-weight: 500; color: var(--text-primary); line-height: 1.4; margin-bottom: 2px; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.mega-post-link em { font-style: normal; font-size: 12px; color: var(--text-weak); }
.mega-card {
  background: var(--dark-bg); color: #fff;
  border-radius: 12px; padding: 20px; text-align: center;
}
.mega-card h5 { font-size: 16px; font-weight: 600; margin: 0 0 6px; color: #fff; }
.mega-card p { font-size: 13px; color: #B8C6DB; margin: 0 0 14px; line-height: 1.5; }
.btn-mega {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--accent-amber); color: #fff;
  height: 34px; padding: 0 16px; border-radius: 8px;
  font-size: 13px; font-weight: 600;
}
.btn-mega:hover { background: var(--accent-amber-deep); color: #fff; }
.site-header .dropdown-menu { display: block; opacity: 0; visibility: hidden; transform: translateY(-6px); transition: opacity var(--transition), transform var(--transition); }
.site-header .dropdown-menu.show { opacity: 1; visibility: visible; transform: translateY(0); }
.navbar-toggler { border: 1px solid var(--border-color); border-radius: 10px; padding: 6px 10px; }
.navbar-toggler:focus { box-shadow: 0 0 0 3px rgba(46,124,246,.15); }

/* Hero */
.hero {
  position: relative;
  background-color: var(--bg-gray);
  background-image:
    linear-gradient(rgba(225,232,240,.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(225,232,240,.5) 1px, transparent 1px);
  background-size: 40px 40px;
  padding: 72px 0 80px;
  overflow: hidden;
}
.hero-row { display: flex; align-items: center; min-height: 480px; }
.hero-text { flex: 0 0 50%; max-width: 50%; padding-right: 48px; }
.hero-text h1 { font-size: 42px; font-weight: 700; line-height: 1.3; margin: 0 0 20px; color: var(--text-primary); }
.hero-text .hero-sub { font-size: 17px; line-height: 1.8; color: var(--text-secondary); margin: 0 0 36px; max-width: 440px; }
.hero-cta { display: flex; align-items: center; gap: 16px; margin-bottom: 32px; flex-wrap: wrap; }
.platform-badges { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.platform-badges span {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--bg-white); border: 1px solid var(--border-color);
  border-radius: 999px; padding: 5px 14px;
  font-size: 13px; font-weight: 500; color: var(--text-secondary);
}
.platform-badges span i { color: var(--brand-blue); }
.hero-visual { flex: 0 0 50%; max-width: 50%; position: relative; }
.screen-frame {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  border: 1px solid var(--border-color);
  overflow: hidden;
}
.screen-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 12px 16px; background: var(--bg-gray);
  border-bottom: 1px solid var(--border-color);
}
.screen-bar .dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-red { background: #FF5F57; } .dot-yellow { background: #FEBC2E; } .dot-green { background: #28C840; }
.screen-frame img { width: 100%; height: auto; min-height: 260px; object-fit: cover; }
.hero-visual::after {
  content: ""; position: absolute; left: 20px; right: -12px; bottom: -10px;
  height: 10px; background: rgba(46,124,246,.15); border-radius: 0 0 20px 20px; z-index: -1;
}

/* Stats */
.stats-bar { border-bottom: 1px solid var(--border-color); background: var(--bg-white); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat-item { padding: 32px 24px; text-align: center; position: relative; }
.stat-item + .stat-item::before {
  content: ""; position: absolute; left: 0; top: 25%; bottom: 25%; width: 1px; background: var(--border-color);
}
.stat-item .stat-num { font-family: var(--font-num); font-size: 36px; font-weight: 700; color: var(--brand-blue); line-height: 1.2; margin-bottom: 4px; }
.stat-item .stat-label { font-size: 14px; color: var(--text-secondary); }

/* Carousel section */
.carousel-wrap { position: relative; }
.feature-side-list {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-1);
}
.feature-side-list h5 { font-size: 14px; font-weight: 600; color: var(--text-weak); margin: 0 0 16px; letter-spacing: 1px; }
.feature-side-list ul { list-style: none; margin: 0; padding: 0; }
.feature-side-list li { display: flex; align-items: center; gap: 10px; padding: 9px 0; font-size: 14px; font-weight: 500; color: var(--text-primary); border-bottom: 1px dashed var(--border-color); }
.feature-side-list li:last-child { border-bottom: none; }
.feature-side-list li i { color: var(--success-green); font-size: 14px; }
#featureCarousel { padding: 0 20px; }
.carousel-slide {
  display: flex; align-items: center; gap: 32px;
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-1);
  min-height: 320px;
}
.slide-window { flex: 0 0 58%; max-width: 58%; }
.slide-window img { border-radius: var(--radius-md); box-shadow: var(--shadow-1); width: 100%; }
.slide-info { flex: 0 0 42%; max-width: 42%; }
.slide-info h3 { font-size: 20px; font-weight: 600; margin: 0 0 12px; color: var(--text-primary); }
.slide-info p { font-size: 14px; line-height: 1.7; color: var(--text-secondary); margin: 0 0 18px; }
.slide-link { font-size: 14px; font-weight: 600; color: var(--brand-blue); display: inline-flex; align-items: center; gap: 6px; }
.slide-link:hover { color: var(--brand-blue-deep); }
#featureCarousel .carousel-control-prev,
#featureCarousel .carousel-control-next {
  width: 44px; height: 44px; top: 50%; transform: translateY(-50%);
  background: var(--bg-white); border: 1px solid var(--border-color);
  border-radius: 50%; opacity: 1; box-shadow: var(--shadow-1);
  color: var(--text-primary);
}
#featureCarousel .carousel-control-prev:hover,
#featureCarousel .carousel-control-next:hover { background: var(--brand-blue-light); color: var(--brand-blue); }
#featureCarousel .carousel-control-prev { left: -24px; }
#featureCarousel .carousel-control-next { right: -24px; }
#featureCarousel .carousel-control-prev i,
#featureCarousel .carousel-control-next i { font-size: 16px; }
#featureCarousel .carousel-control-prev-icon,
#featureCarousel .carousel-control-next-icon { display: none; }
#featureCarousel .carousel-indicators { position: static; margin: 24px 0 0; display: flex; gap: 8px; justify-content: center; align-items: center; }
#featureCarousel .carousel-indicators button {
  width: 8px; height: 8px; border-radius: 999px;
  background: #C5D0DF; border: none; flex: 0 0 auto;
  margin: 0; padding: 0; transition: width .3s ease, background .3s ease;
}
#featureCarousel .carousel-indicators button.active { width: 28px; background: var(--brand-blue); }

/* Feature highlights */
.feature-row {
  display: flex; align-items: center; gap: 56px;
  margin-bottom: 80px;
}
.feature-row:last-child { margin-bottom: 0; }
.feature-media { flex: 0 0 50%; max-width: 50%; }
.feature-media img { border-radius: var(--radius-lg); box-shadow: var(--shadow-1); width: 100%; }
.feature-content { flex: 0 0 50%; max-width: 50%; }
.feature-icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: var(--brand-blue-light); color: var(--brand-blue);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; margin-bottom: 18px;
}
.feature-content h3 { font-size: 22px; font-weight: 600; margin: 0 0 12px; color: var(--text-primary); }
.feature-content p { font-size: 15px; line-height: 1.8; color: var(--text-secondary); margin: 0 0 18px; max-width: 440px; }
.feature-link { font-size: 14px; font-weight: 600; color: var(--brand-blue); display: inline-flex; align-items: center; gap: 6px; }
.feature-link:hover { color: var(--brand-blue-deep); }

/* System requirements */
.sysreq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.sysreq-card {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 28px;
  box-shadow: var(--shadow-1);
  position: relative;
  overflow: hidden;
}
.sysreq-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 4px; background: var(--accent-amber);
}
.sysreq-card h3 { font-size: 18px; font-weight: 600; margin: 0 0 20px; color: var(--text-primary); }
.sysreq-card .req-row { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border-bottom: 1px dashed var(--border-color); }
.sysreq-card .req-row:last-child { border-bottom: none; }
.req-row .req-label { font-size: 14px; color: var(--text-secondary); }
.req-row .req-value { font-family: var(--font-num); font-size: 15px; font-weight: 600; color: var(--text-primary); text-align: right; }
.sysreq-note { margin-top: 20px; font-size: 13px; color: var(--text-weak); }

/* News cards */
.news-card {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  transition: transform var(--transition), box-shadow var(--transition);
  height: 100%;
  display: flex; flex-direction: column;
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); }
.news-thumb { display: block; overflow: hidden; aspect-ratio: 16 / 9; }
.news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.news-card:hover .news-thumb img { transform: scale(1.04); }
.news-body { padding: 22px 24px 20px; display: flex; flex-direction: column; flex: 1; }
.badge-cat {
  display: inline-block;
  background: var(--brand-blue-light); color: var(--brand-blue-deep);
  font-size: 12px; font-weight: 500;
  padding: 3px 12px; border-radius: 999px;
  margin-bottom: 12px; width: fit-content;
}
.news-title { font-size: 17px; font-weight: 600; line-height: 1.5; margin: 0 0 10px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-title a { color: var(--text-primary); }
.news-title a:hover { color: var(--brand-blue); }
.news-summary { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin: 0 0 16px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; flex: 1; }
.news-meta { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--bg-gray); padding-top: 14px; }
.news-date { font-size: 12px; color: var(--text-weak); }
.read-link { font-size: 13px; font-weight: 600; color: var(--brand-blue); }
.read-link:hover { color: var(--brand-blue-deep); }
.empty-state .empty-box {
  background: var(--bg-gray);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  min-height: 280px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px;
}
.empty-box i { font-size: 48px; color: #C5D0DF; }
.empty-box p { font-size: 15px; color: var(--text-secondary); margin: 0; }

/* Testimonials */
.testimonial-card {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 26px 22px;
  box-shadow: var(--shadow-1);
  position: relative;
  border-left: 4px solid var(--brand-blue);
  height: 100%;
  transition: border-color var(--transition);
}
.testimonial-card:hover { border-color: var(--brand-blue); }
.testimonial-card .t-stars { color: var(--accent-amber); font-size: 16px; letter-spacing: 2px; margin-bottom: 12px; }
.testimonial-card .t-text { font-size: 14px; line-height: 1.7; color: var(--text-secondary); margin: 0 0 20px; }
.t-person { display: flex; align-items: center; gap: 12px; }
.t-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--brand-blue-light); color: var(--brand-blue-deep);
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 600;
}
.t-person .t-name { font-size: 14px; font-weight: 600; color: var(--text-primary); display: block; line-height: 1.3; }
.t-person .t-role { font-size: 12px; color: var(--text-weak); display: block; line-height: 1.4; }
.badge-recommend {
  position: absolute; top: 20px; right: 20px;
  background: var(--accent-amber); color: #fff;
  font-size: 11px; font-weight: 600;
  padding: 3px 10px; border-radius: 999px;
}

/* Download section */
.download-wrap {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-1);
}
.download-left { display: flex; flex-direction: column; justify-content: center; }
.download-left h2 { font-size: 24px; font-weight: 700; margin: 0 0 12px; }
.download-left .dl-sub { font-size: 14px; color: var(--text-secondary); margin: 0 0 28px; }
.btn-group-dl { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.btn-win, .btn-mac {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--bg-white); color: var(--text-primary);
  border: 1px solid var(--border-color);
  height: 44px; padding: 0 20px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; transition: all var(--transition);
}
.btn-win:hover, .btn-mac:hover { border-color: var(--brand-blue); color: var(--brand-blue); background: var(--brand-blue-light); }
.btn-win i, .btn-mac i { font-size: 16px; }
.dl-version { font-size: 12px; color: var(--text-weak); margin-top: 14px; }
.qr-block { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; }
.qr-box {
  width: 120px; height: 120px;
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.qr-box::before,
.qr-box::after {
  content: ""; position: absolute;
  background: var(--text-primary);
}
.qr-box::before { width: 80px; height: 80px; background-image: linear-gradient(to right, var(--text-primary) 25%, transparent 25%, transparent 50%, var(--text-primary) 50%, var(--text-primary) 75%, transparent 75%); background-size: 12px 12px; opacity: .35; border-radius: 4px; mask-image: radial-gradient(circle at center, #000 30%, transparent 70%); -webkit-mask-image: radial-gradient(circle at center, #000 30%, transparent 70%); }
.qr-box span {
  width: 20px; height: 20px; background: var(--bg-white);
  border: 2px solid var(--text-primary); border-radius: 4px;
  position: relative; z-index: 2;
}
.qr-block .qr-label { font-size: 12px; color: var(--text-weak); }

/* FAQ */
.accordion-item {
  background: var(--bg-white);
  border: 1px solid var(--border-color) !important;
  border-radius: 12px !important;
  margin-bottom: 16px;
  overflow: hidden;
}
.accordion-header .accordion-button {
  padding: 18px 24px;
  font-size: 16px; font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-white);
  box-shadow: none;
  font-family: var(--font-main);
}
.accordion-button:not(.collapsed) { color: var(--text-primary); background: var(--brand-blue-light); border-top: 2px solid var(--brand-blue); }
.accordion-button:focus { box-shadow: 0 0 0 3px rgba(46,124,246,.15); border-color: transparent; }
.accordion-button::after {
  font-family: "Font Awesome 6 Free"; font-weight: 900;
  content: "\2b"; background-image: none;
  width: 16px; height: 16px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 14px; color: var(--brand-blue);
}
.accordion-button:not(.collapsed)::after { content: "\f068"; }
.accordion-body { padding: 4px 24px 20px; font-size: 15px; line-height: 1.8; color: var(--text-secondary); }

/* CTA */
.cta-bar {
  background: var(--brand-blue-light);
  border-radius: var(--radius-lg);
  padding: 48px 56px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  flex-wrap: wrap;
}
.cta-bar h2 { font-size: 24px; font-weight: 700; margin: 0; color: var(--text-primary); }
.cta-bar .cta-action { display: flex; align-items: center; gap: 16px; }

/* Footer */
.site-footer { background: var(--dark-bg); color: #B8C6DB; padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 48px; margin-bottom: 48px; }
.footer-brand .brand-text-lg { font-size: 22px; font-weight: 700; color: #fff; display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand .brand-icon-lg {
  width: 40px; height: 40px; border-radius: 12px;
  background: var(--brand-blue); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 18px;
}
.footer-brand p { font-size: 14px; line-height: 1.7; color: #8A97AC; margin: 0 0 20px; max-width: 300px; }
.footer-icp { font-size: 12px; color: #5F6E85; }
.footer-col h4 { font-size: 16px; font-weight: 600; color: #fff; margin: 0 0 18px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { font-size: 14px; color: #B8C6DB; transition: color var(--transition); }
.footer-col ul a:hover { color: #fff; }
.footer-subscribe { display: flex; gap: 8px; margin-bottom: 24px; }
.footer-subscribe input {
  flex: 1; height: 40px; border: none; border-radius: 8px;
  padding: 0 14px; font-size: 14px; background: rgba(255,255,255,.1); color: #fff;
  font-family: var(--font-main);
}
.footer-subscribe input::placeholder { color: #82909F; }
.footer-subscribe input:focus { outline: none; background: rgba(255,255,255,.16); }
.footer-subscribe .btn-subscribe {
  height: 40px; padding: 0 18px; border: none; border-radius: 8px;
  background: var(--accent-amber); color: #fff; font-size: 14px; font-weight: 600;
  transition: background var(--transition);
}
.footer-subscribe .btn-subscribe:hover { background: var(--accent-amber-deep); }
.footer-contact { font-size: 14px; color: #8A97AC; margin-bottom: 6px; }
.footer-contact i { margin-right: 8px; color: var(--brand-blue); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  padding: 20px 0; text-align: center;
  font-size: 12px; color: rgba(255,255,255,.5);
}

/* Responsive */
@media (max-width: 991.98px) {
  .container { padding-left: 16px; padding-right: 16px; }
  .hero-row { flex-direction: column; min-height: 0; padding: 32px 0 0; }
  .hero-text { flex: 0 0 100%; max-width: 100%; padding-right: 0; text-align: center; margin-bottom: 40px; }
  .hero-text .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .platform-badges { justify-content: center; }
  .hero-visual { flex: 0 0 100%; max-width: 100%; }
  .hero { padding: 48px 0 64px; }
  .feature-row { flex-direction: column !important; gap: 24px; margin-bottom: 56px; }
  .feature-media, .feature-content { flex: 0 0 100%; max-width: 100%; }
  .feature-content { text-align: left; }
  .sysreq-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(2)::before { display: none; }
  .stat-item:nth-child(n+3)::before { display: none; }
  .stats-grid .stat-item:nth-child(2) { border-left: none; }
  .carousel-slide { flex-direction: column; }
  .slide-window, .slide-info { flex: 0 0 100%; max-width: 100%; }
  .carousel-wrap { padding: 0; }
  .mega-menu { min-width: 280px !important; }
  .mega-grid { grid-template-columns: 1fr; }
  .navbar-collapse { padding: 16px 0; }
  .navbar-nav { gap: 4px; }
  .nav-actions { padding-top: 12px; width: 100%; }
  .section { padding: 56px 0; }
  .download-wrap { padding: 32px 24px; }
  .qr-block { margin-top: 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 767.98px) {
  .hero-text h1 { font-size: 30px; }
  .section-header h2 { font-size: 24px; }
  .stat-item .stat-num { font-size: 28px; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .btn-group-dl { width: 100%; }
  .btn-download { width: 100%; }
  .btn-win, .btn-mac { flex: 1; }
  .cta-bar { padding: 32px 24px; flex-direction: column; text-align: center; }
  .cta-action { flex-direction: column; width: 100%; }
  .cta-action .btn { width: 100%; }
  #featureCarousel { padding: 0; }
  #featureCarousel .carousel-control-prev { left: -6px; }
  #featureCarousel .carousel-control-next { right: -6px; }
}
@media (max-width: 575.98px) {
  .hero-text h1 { font-size: 28px; }
  .hero-text .hero-sub { font-size: 15px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { padding: 20px 12px; }
  .stat-item .stat-num { font-size: 24px; }
  .section-header { flex-direction: column; align-items: flex-start; }
  .news-title { font-size: 16px; }
  .news-body { padding: 18px 18px 16px; }
  .download-wrap { padding: 24px 16px; }
  .btn-download { min-width: 100%; }
}

/* roulang page: article */
:root {
            --primary: #2e7cf6;
            --primary-dark: #1c5fd1;
            --primary-light: #ebf2fe;
            --accent: #f5a524;
            --accent-dark: #d97e00;
            --success: #21a35e;
            --text-main: #17233a;
            --text-secondary: #5a6b83;
            --text-weak: #8a97ac;
            --bg-white: #ffffff;
            --bg-gray: #f5f8fc;
            --border: #e1e8f0;
            --dark-bg: #14283f;
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 20px;
            --shadow-sm: 0 1px 3px rgba(23, 35, 58, .06), 0 2px 8px rgba(23, 35, 58, .05);
            --shadow-lg: 0 8px 24px rgba(23, 35, 58, .10), 0 2px 8px rgba(23, 35, 58, .06);
            --transition: .25s ease;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-main);
            background: var(--bg-white);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

        a:hover {
            color: var(--primary-dark);
        }

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input,
        textarea {
            font-family: inherit;
        }

        ul,
        ol {
            list-style: none;
        }

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

        .section {
            padding: 96px 0;
        }

        /* ===== Buttons ===== */
        .btn {
            border-radius: var(--radius-sm);
            font-weight: 500;
            transition: all var(--transition);
            border: none;
            padding: 12px 24px;
        }

        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            box-shadow: none;
        }

        .btn-primary {
            background: var(--primary);
            border-color: var(--primary);
            padding: 12px 28px;
            border-radius: var(--radius-sm);
        }

        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-radius: 12px;
            font-weight: 600;
            padding: 14px 32px;
            height: 56px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            transition: all var(--transition);
        }

        .btn-accent:hover {
            background: var(--accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .btn-accent:active {
            transform: scale(.98);
        }

        .btn-outline-primary {
            background: #fff;
            border: 1.5px solid var(--primary);
            color: var(--primary);
            border-radius: var(--radius-sm);
            padding: 10px 24px;
        }

        .btn-outline-primary:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1030;
            background: transparent;
            transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
            border-bottom: 1px solid transparent;
        }

        .site-header.header-scrolled,
        .site-header.header-expanded {
            background: rgba(255, 255, 255, .97);
            border-bottom-color: var(--border);
            box-shadow: var(--shadow-sm);
        }

        .site-header .navbar {
            padding-top: 14px;
            padding-bottom: 14px;
            min-height: 72px;
        }

        .navbar-brand {
            padding: 0;
            margin: 0;
            display: inline-flex;
            align-items: center;
        }

        .brand-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .brand-icon {
            width: 38px;
            height: 38px;
            background: var(--primary);
            border-radius: 10px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            box-shadow: 0 4px 10px rgba(46, 124, 246, .25);
        }

        .brand-text {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: .5px;
        }

        .navbar-nav {
            gap: 4px;
        }

        .navbar-nav .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
            padding: 10px 14px !important;
            position: relative;
            transition: color var(--transition);
        }

        .navbar-nav .nav-link::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transform: scaleX(0);
            transition: transform var(--transition);
        }

        .navbar-nav .nav-link:hover {
            color: var(--primary);
        }

        .navbar-nav .nav-link:hover::after,
        .navbar-nav .nav-link.active::after {
            transform: scaleX(1);
        }

        .navbar-nav .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .mega-btn {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 8px 18px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-main);
            transition: all var(--transition);
            line-height: 1.5;
        }

        .mega-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }

        .mega-btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        .nav-download-btn {
            background: var(--accent);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            padding: 8px 20px;
            border-radius: 999px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
            border: none;
            line-height: 1.5;
        }

        .nav-download-btn:hover {
            background: var(--accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        .mega-menu {
            width: 720px;
            max-width: 92vw;
            border: 1px solid var(--border);
            border-radius: 16px;
            box-shadow: var(--shadow-lg);
            padding: 24px;
            margin-top: 10px;
            border-top: 3px solid var(--primary);
        }

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

        .mega-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-weak);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 16px;
            padding-bottom: 8px;
            border-bottom: 1px solid var(--border);
        }

        .mega-link {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-main);
            border-radius: 8px;
            transition: all var(--transition);
        }

        .mega-link i {
            color: var(--primary);
            width: 18px;
            text-align: center;
        }

        .mega-link:hover {
            color: var(--primary);
            padding-left: 6px;
            background: var(--primary-light);
        }

        .mega-post-link {
            display: block;
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
            transition: all var(--transition);
        }

        .mega-post-link:last-child {
            border-bottom: none;
        }

        .mega-post-link span {
            display: block;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-main);
            line-height: 1.5;
            margin-bottom: 4px;
            transition: color var(--transition);
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        .mega-post-link em {
            font-style: normal;
            font-size: 12px;
            color: var(--text-weak);
        }

        .mega-post-link:hover span {
            color: var(--primary);
        }

        .mega-card {
            background: var(--dark-bg);
            border-radius: 14px;
            padding: 24px;
            color: #fff;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            min-height: 160px;
        }

        .mega-card h4 {
            color: #fff;
            border-bottom: none;
            font-size: 18px;
            font-weight: 700;
            padding-bottom: 0;
            margin-bottom: 8px;
        }

        .mega-card p {
            font-size: 13px;
            color: #b8c6db;
            margin-bottom: 16px;
            line-height: 1.6;
        }

        .mega-card-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--accent);
            color: #fff;
            border-radius: 8px;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 600;
            transition: background var(--transition), transform var(--transition);
        }

        .mega-card-btn:hover {
            background: var(--accent-dark);
            color: #fff;
            transform: translateY(-2px);
        }

        .navbar-toggler {
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 8px 10px;
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(46, 124, 246, .25);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-wrap {
            background: var(--bg-gray);
            padding: 16px 0;
            border-bottom: 1px solid var(--border);
        }

        .breadcrumb-wrap .breadcrumb {
            margin-bottom: 0;
            font-size: 14px;
        }

        .breadcrumb-wrap .breadcrumb-item a {
            color: var(--text-secondary);
            transition: color var(--transition);
        }

        .breadcrumb-wrap .breadcrumb-item a:hover {
            color: var(--primary);
        }

        .breadcrumb-wrap .breadcrumb-item.active {
            color: var(--text-weak);
        }

        .breadcrumb-wrap .breadcrumb-item+.breadcrumb-item::before {
            color: var(--text-weak);
            opacity: .5;
        }

        /* ===== Article Page ===== */
        .article-page {
            background: var(--bg-white);
            padding: 64px 0 96px;
        }

        .article-wrap {
            max-width: 840px;
            margin: 0 auto;
            background: #fff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            padding: 48px 56px;
        }

        .article-header {
            text-align: center;
            margin-bottom: 24px;
        }

        .article-title {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-main);
            line-height: 1.4;
            margin-bottom: 16px;
            letter-spacing: .3px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            gap: 12px 20px;
            font-size: 14px;
            color: var(--text-secondary);
        }

        .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .meta-item i {
            color: var(--text-weak);
            font-size: 13px;
        }

        .meta-cat {
            display: inline-flex;
            align-items: center;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 999px;
            padding: 3px 12px;
            font-size: 13px;
            font-weight: 500;
            transition: all var(--transition);
        }

        .meta-cat:hover {
            background: var(--primary);
            color: #fff;
        }

        .article-divider {
            border-top: 1px solid var(--border);
            margin: 28px 0 36px;
            position: relative;
        }

        .article-divider::after {
            content: '';
            position: absolute;
            top: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 48px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
        }

        /* ===== Article Content Typography ===== */
        .article-content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text-main);
        }

        .article-content h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-main);
            margin: 36px 0 16px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border);
            position: relative;
        }

        .article-content h2::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -1px;
            width: 56px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }

        .article-content h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-main);
            margin: 28px 0 12px;
        }

        .article-content p {
            margin-bottom: 24px;
            color: var(--text-main);
        }

        .article-content ul {
            margin: 0 0 24px;
            padding-left: 0;
        }

        .article-content ul li {
            position: relative;
            padding-left: 20px;
            margin-bottom: 10px;
            line-height: 1.8;
        }

        .article-content ul li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 12px;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--primary);
        }

        .article-content ol {
            margin: 0 0 24px;
            padding-left: 24px;
            list-style: decimal;
        }

        .article-content ol li {
            margin-bottom: 10px;
            padding-left: 4px;
        }

        .article-content img {
            border-radius: 12px;
            box-shadow: var(--shadow-sm);
            margin: 32px auto;
            display: block;
        }

        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--bg-gray);
            padding: 20px 24px;
            border-radius: 0 12px 12px 0;
            margin: 32px 0;
            color: var(--text-secondary);
            font-size: 15px;
        }

        .article-content blockquote p {
            margin-bottom: 0;
            color: var(--text-secondary);
        }

        .article-content pre {
            background: #f0f3f8;
            border-radius: 10px;
            padding: 18px 22px;
            overflow-x: auto;
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
            font-size: 14px;
            line-height: 1.7;
            margin: 32px 0;
            border: 1px solid var(--border);
        }

        .article-content code {
            background: #f0f3f8;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 14px;
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
            color: var(--primary-dark);
        }

        .article-content pre code {
            background: transparent;
            padding: 0;
            color: var(--text-main);
        }

        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-content a:hover {
            color: var(--primary-dark);
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 32px 0;
            font-size: 14px;
        }

        .article-content table th,
        .article-content table td {
            border: 1px solid var(--border);
            padding: 12px 16px;
            text-align: left;
        }

        .article-content table th {
            background: var(--bg-gray);
            font-weight: 600;
        }

        .article-content table tr:hover {
            background: var(--bg-gray);
        }

        /* ===== Article Footer ===== */
        .article-footer {
            margin-top: 48px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
        }

        .tag-label,
        .share-label {
            font-size: 14px;
            color: var(--text-weak);
            margin-right: 4px;
        }

        .tag-pill {
            display: inline-block;
            background: var(--bg-gray);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            font-size: 12px;
            font-weight: 500;
            padding: 4px 14px;
            border-radius: 999px;
            transition: all var(--transition);
        }

        .tag-pill:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }

        .article-share {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .share-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: 1px solid var(--border);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            font-size: 16px;
            transition: all var(--transition);
            background: #fff;
        }

        .share-icon:hover {
            background: var(--primary-light);
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
        }

        /* ===== Related Posts ===== */
        .related-posts {
            max-width: 840px;
            margin: 64px auto 0;
        }

        .section-title-sm {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 24px;
            position: relative;
            padding-left: 16px;
        }

        .section-title-sm::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 4px;
            height: 22px;
            background: var(--accent);
            border-radius: 4px;
        }

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

        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: block;
            color: var(--text-main);
        }

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

        .related-cover {
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--bg-gray);
        }

        .related-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }

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

        .related-info {
            padding: 18px 20px 16px;
        }

        .related-info h3 {
            font-size: 16px;
            font-weight: 600;
            line-height: 1.55;
            margin-bottom: 10px;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            transition: color var(--transition);
        }

        .related-card:hover .related-info h3 {
            color: var(--primary);
        }

        .related-date {
            font-size: 13px;
            color: var(--text-weak);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .related-date i {
            font-size: 12px;
        }

        /* ===== Back to list ===== */
        .article-back {
            max-width: 840px;
            margin: 32px auto 0;
            text-align: center;
        }

        .article-back a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 10px 24px;
            border: 1px solid var(--border);
            border-radius: 999px;
            transition: all var(--transition);
            background: #fff;
        }

        .article-back a:hover {
            color: var(--primary);
            border-color: var(--primary);
            background: var(--primary-light);
        }

        .article-back a i {
            transition: transform var(--transition);
        }

        .article-back a:hover i {
            transform: translateX(-4px);
        }

        /* ===== Not Found ===== */
        .content-not-found {
            text-align: center;
            padding: 80px 40px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .content-not-found i {
            font-size: 64px;
            color: var(--text-weak);
            margin-bottom: 20px;
            display: inline-block;
            animation: float 3s ease-in-out infinite;
        }

        @keyframes float {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-8px);
            }
        }

        .content-not-found h1 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }

        .content-not-found p {
            color: var(--text-secondary);
            margin-bottom: 28px;
            max-width: 400px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--dark-bg);
            color: #fff;
            padding-top: 72px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 48px;
            padding-bottom: 48px;
        }

        .brand-text-lg {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .brand-icon-lg {
            width: 38px;
            height: 38px;
            background: var(--primary);
            border-radius: 10px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
        }

        .footer-brand p {
            color: #b8c6db;
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 16px;
            max-width: 280px;
        }

        .footer-icp {
            font-size: 12px;
            color: rgba(255, 255, 255, .4);
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 24px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
        }

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

        .footer-col ul li a {
            color: #b8c6db;
            font-size: 14px;
            transition: all var(--transition);
        }

        .footer-col ul li a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-subscribe {
            display: flex;
            gap: 8px;
            margin-bottom: 20px;
        }

        .footer-subscribe input {
            flex: 1;
            height: 40px;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, .2);
            background: rgba(255, 255, 255, .08);
            color: #fff;
            padding: 0 14px;
            font-size: 14px;
            outline: none;
            transition: all var(--transition);
        }

        .footer-subscribe input::placeholder {
            color: rgba(255, 255, 255, .4);
        }

        .footer-subscribe input:focus {
            border-color: var(--primary);
            background: rgba(255, 255, 255, .12);
            box-shadow: 0 0 0 3px rgba(46, 124, 246, .2);
        }

        .btn-subscribe {
            height: 40px;
            padding: 0 20px;
            border-radius: 8px;
            background: var(--accent);
            border: none;
            color: #fff;
            font-size: 14px;
            font-weight: 500;
            transition: all var(--transition);
            white-space: nowrap;
        }

        .btn-subscribe:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
        }

        .footer-contact {
            color: #b8c6db;
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 8px;
        }

        .footer-contact i {
            color: var(--primary);
            width: 16px;
            text-align: center;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .12);
            padding: 24px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, .5);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1199px) {
            .navbar-nav .nav-link {
                margin: 0 8px;
                padding: 10px 10px !important;
            }
            .navbar-nav .nav-link::after {
                left: 10px;
                right: 10px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 991px) {
            .navbar-collapse {
                background: #fff;
                border-radius: 16px;
                padding: 16px 20px;
                box-shadow: var(--shadow-lg);
                margin-top: 12px;
                border: 1px solid var(--border);
            }
            .navbar-nav {
                text-align: left;
                margin-bottom: 16px !important;
            }
            .navbar-nav .nav-link {
                padding: 12px 14px !important;
                border-radius: 8px;
            }
            .navbar-nav .nav-link::after {
                display: none;
            }
            .navbar-nav .nav-link:hover {
                background: var(--primary-light);
            }
            .nav-actions {
                flex-direction: column;
                align-items: stretch;
                gap: 10px;
            }
            .mega-btn,
            .nav-download-btn {
                justify-content: center;
                width: 100%;
            }
            .mega-menu {
                width: 100%;
                position: static !important;
                transform: none !important;
                margin-top: 8px;
                box-shadow: none;
            }
            .mega-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .article-wrap {
                padding: 32px 28px;
            }
            .article-title {
                font-size: 26px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 767px) {
            .section {
                padding: 56px 0;
            }
            .article-page {
                padding: 40px 0 64px;
            }
            .article-wrap {
                padding: 24px 20px;
                border-radius: 14px;
            }
            .article-title {
                font-size: 22px;
            }
            .article-meta {
                flex-direction: column;
                gap: 6px;
            }
            .article-content {
                font-size: 15px;
            }
            .article-content h2 {
                font-size: 19px;
            }
            .article-content h3 {
                font-size: 16px;
            }
            .article-footer {
                flex-direction: column;
                align-items: flex-start;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .content-not-found {
                padding: 48px 20px;
            }
            .content-not-found h1 {
                font-size: 24px;
            }
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        @media (max-width: 575px) {
            .brand-text {
                font-size: 19px;
            }
            .brand-icon {
                width: 34px;
                height: 34px;
                font-size: 14px;
            }
            .related-info h3 {
                font-size: 15px;
            }
            .article-back a {
                font-size: 14px;
                padding: 8px 18px;
            }
        }

        /* ===== Focus accessibility ===== */
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

/* roulang page: category1 */
:root {
      --brand-blue: #2E7CF6;
      --brand-blue-dark: #1C5FD1;
      --brand-blue-light: #EBF2FE;
      --accent-amber: #F5A524;
      --accent-amber-dark: #D97E00;
      --success-green: #21A35E;
      --text-main: #17233A;
      --text-secondary: #5A6B83;
      --text-muted: #8A97AC;
      --bg-white: #FFFFFF;
      --bg-light: #F5F8FC;
      --border-color: #E1E8F0;
      --dark-bg: #14283F;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 20px;
      --radius-pill: 999px;
      --shadow-1: 0 1px 3px rgba(23,35,58,.06), 0 2px 8px rgba(23,35,58,.05);
      --shadow-2: 0 8px 24px rgba(23,35,58,.10), 0 2px 8px rgba(23,35,58,.06);
      --font-main: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font-main);
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-main);
      background: var(--bg-white);
      -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; display: block; }
    a { color: var(--brand-blue); text-decoration: none; transition: all .25s ease; }
    a:hover { color: var(--brand-blue-dark); }
    .container { max-width: 1200px; padding-left: 24px; padding-right: 24px; }
    .btn { border-radius: 10px; font-weight: 500; transition: all .25s ease; }
    .btn:focus-visible, .form-control:focus-visible, a:focus-visible {
      outline: 2px solid var(--brand-blue);
      outline-offset: 2px;
    }

    /* ---------- Header / Nav ---------- */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255,255,255,.96);
      transition: box-shadow .25s ease, background .25s ease;
    }
    .site-header.scrolled {
      background: #fff;
      box-shadow: var(--shadow-1);
    }
    .site-header .navbar {
      padding-top: 14px;
      padding-bottom: 14px;
      min-height: 72px;
    }
    .brand-logo { display: flex; align-items: center; gap: 10px; }
    .brand-icon {
      width: 38px; height: 38px; border-radius: 10px;
      background: var(--brand-blue); color: #fff;
      display: flex; align-items: center; justify-content: center;
      font-size: 18px;
    }
    .brand-text { font-size: 24px; font-weight: 700; color: var(--text-main); letter-spacing: .5px; }
    .navbar-nav { gap: 8px; }
    .navbar-nav .nav-link {
      font-size: 15px; font-weight: 500; color: var(--text-secondary);
      padding: 8px 16px !important; border-radius: 8px; position: relative;
    }
    .navbar-nav .nav-link:hover { color: var(--brand-blue); background: var(--bg-light); }
    .navbar-nav .nav-link.active {
      color: var(--brand-blue); font-weight: 600; background: var(--brand-blue-light);
    }
    .navbar-nav .nav-link.active::after {
      content: ""; position: absolute; left: 16px; right: 16px; bottom: 2px;
      height: 2px; background: var(--brand-blue); border-radius: 2px;
    }
    .nav-actions { display: flex; align-items: center; gap: 12px; }
    .mega-btn {
      border: 1px solid var(--border-color); background: #fff;
      font-size: 14px; font-weight: 500; color: var(--text-main);
      padding: 9px 16px; border-radius: var(--radius-pill); transition: all .25s ease;
    }
    .mega-btn:hover { border-color: var(--brand-blue); color: var(--brand-blue); }
    .btn-download-nav {
      background: var(--accent-amber); color: #fff; border-radius: var(--radius-pill);
      font-size: 14px; font-weight: 600; padding: 9px 20px; transition: all .25s ease;
      white-space: nowrap;
    }
    .btn-download-nav:hover { background: var(--accent-amber-dark); color: #fff; transform: translateY(-1px); }
    .navbar-toggler { border: 1px solid var(--border-color); border-radius: 8px; }
    .navbar-toggler:focus { box-shadow: 0 0 0 2px rgba(46,124,246,.3); }

    .mega-menu {
      width: 720px; max-width: calc(100vw - 32px);
      border: 1px solid var(--border-color) !important;
      border-radius: var(--radius-md) !important;
      box-shadow: var(--shadow-2) !important;
      padding: 24px !important;
      margin-top: 8px !important;
    }
    .mega-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
    .mega-col h4 {
      font-size: 14px; font-weight: 600; color: var(--text-muted);
      margin-bottom: 12px; letter-spacing: .5px;
    }
    .mega-link {
      display: block; padding: 8px 0; color: var(--text-main);
      font-size: 14px; font-weight: 500;
    }
    .mega-link i { color: var(--brand-blue); margin-right: 8px; width: 18px; text-align: center; }
    .mega-link:hover { color: var(--brand-blue); }
    .mega-post-link {
      display: block; padding: 10px 0; border-bottom: 1px solid var(--border-color);
      transition: all .25s ease;
    }
    .mega-post-link:last-child { border-bottom: none; }
    .mega-post-link span { display: block; font-size: 14px; font-weight: 500; color: var(--text-main); line-height: 1.5; }
    .mega-post-link em { font-style: normal; font-size: 12px; color: var(--text-muted); }
    .mega-post-link:hover span { color: var(--brand-blue); }
    .mega-card {
      background: var(--dark-bg); border-radius: 12px; padding: 20px; color: #fff;
      display: flex; flex-direction: column; gap: 8px; height: 100%;
    }
    .mega-card-title { font-size: 15px; font-weight: 600; color: #fff; }
    .mega-card p { font-size: 13px; color: #B8C6DB; line-height: 1.6; margin: 0; }
    .mega-card-btn {
      display: inline-block; margin-top: auto; background: var(--accent-amber); color: #fff;
      font-size: 13px; font-weight: 600; border-radius: 8px; padding: 8px 16px;
      transition: all .25s ease; align-self: flex-start;
    }
    .mega-card-btn:hover { background: var(--accent-amber-dark); color: #fff; }

    /* ---------- Page Hero ---------- */
    .page-hero {
      background-color: var(--bg-light);
      position: relative;
      overflow: hidden;
      padding: 96px 0 0;
    }
    .page-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-color: rgba(245, 248, 252, .92);
      z-index: 0;
    }
    .page-hero::after {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.png');
      background-size: cover;
      background-position: center;
      opacity: .18;
      z-index: 0;
    }
    .page-hero .container { position: relative; z-index: 1; }
    .hero-badge {
      display: inline-block; background: var(--brand-blue-light); color: var(--brand-blue);
      font-size: 13px; font-weight: 600; border-radius: var(--radius-pill);
      padding: 6px 16px; margin-bottom: 20px; letter-spacing: .5px;
    }
    .page-hero h1 {
      font-size: 42px; font-weight: 700; line-height: 1.3;
      color: var(--text-main); margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 17px; color: var(--text-secondary);
      line-height: 1.8; max-width: 520px; margin-bottom: 28px;
    }
    .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 28px; }
    .btn-accent {
      background: var(--accent-amber); color: #fff; font-size: 16px; font-weight: 600;
      padding: 14px 32px; border-radius: 12px; border: none;
      transition: all .25s ease;
    }
    .btn-accent:hover { background: var(--accent-amber-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-2); }
    .btn-accent:active { transform: scale(.98); }
    .btn-outline-brand {
      background: #fff; color: var(--brand-blue); font-size: 16px; font-weight: 600;
      padding: 12px 28px; border-radius: 10px; border: 1.5px solid var(--brand-blue);
      transition: all .25s ease;
    }
    .btn-outline-brand:hover { background: var(--brand-blue-light); color: var(--brand-blue-dark); }
    .platform-badges { display: flex; gap: 12px; flex-wrap: wrap; }
    .platform-badges span {
      display: inline-flex; align-items: center; gap: 6px;
      background: #fff; border: 1px solid var(--border-color);
      border-radius: var(--radius-pill); padding: 6px 14px;
      font-size: 13px; color: var(--text-secondary); font-weight: 500;
    }
    .platform-badges span i { color: var(--brand-blue); }
    .hero-visual {
      background: #fff; border: 1px solid var(--border-color);
      border-radius: var(--radius-lg); box-shadow: var(--shadow-2);
      overflow: hidden; position: relative;
    }
    .hero-visual img { width: 100%; height: 340px; object-fit: cover; }
    .hero-visual::after {
      content: ""; display: block; height: 8px;
      background: var(--brand-blue-light);
    }

    /* ---------- Trust Strip ---------- */
    .trust-strip {
      background: #fff; border-bottom: 1px solid var(--border-color);
      padding: 24px 0;
    }
    .trust-strip .row { align-items: center; }
    .trust-item { text-align: center; padding: 8px 0; }
    .trust-item + .trust-item { border-left: 1px solid var(--border-color); }
    .trust-num { display: block; font-size: 28px; font-weight: 700; color: var(--brand-blue); line-height: 1.2; }
    .trust-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

    /* ---------- Section headers ---------- */
    .section-header { max-width: 640px; margin: 0 auto 48px; text-align: center; }
    .section-header h2 { font-size: 26px; font-weight: 700; line-height: 1.4; margin-bottom: 12px; color: var(--text-main); }
    .section-header p { font-size: 16px; color: var(--text-secondary); line-height: 1.8; margin: 0; }
    .section-header.left { text-align: left; margin-left: 0; }

    /* ---------- Product List ---------- */
    .product-list-section { background: var(--bg-white); padding: 96px 0; }
    .product-item {
      display: grid; grid-template-columns: 5fr 7fr; gap: 40px;
      padding: 40px 0; border-bottom: 1px solid var(--border-color);
      align-items: center;
    }
    .product-item:first-of-type { padding-top: 0; }
    .product-item:last-of-type { border-bottom: none; }
    .product-media {
      background: #fff; border: 1px solid var(--border-color);
      border-radius: var(--radius-md); box-shadow: var(--shadow-1);
      overflow: hidden; position: relative;
    }
    .browser-bar {
      display: flex; align-items: center; gap: 6px;
      background: #F0F3F8; padding: 10px 14px;
      border-bottom: 1px solid var(--border-color);
    }
    .browser-bar .dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
    .dot-red { background: #FF5F57; }
    .dot-yellow { background: #FEBC2E; }
    .dot-green { background: #28C840; }
    .product-media img { width: 100%; height: 220px; object-fit: cover; }
    .product-version-tag {
      position: absolute; top: 48px; right: 12px;
      background: var(--success-green); color: #fff;
      font-size: 12px; font-weight: 600; padding: 4px 12px;
      border-radius: var(--radius-pill);
    }
    .product-cat-tag {
      display: inline-flex; align-items: center; gap: 6px;
      background: var(--brand-blue-light); color: var(--brand-blue);
      font-size: 13px; font-weight: 600; border-radius: var(--radius-pill);
      padding: 5px 14px; margin-bottom: 12px;
    }
    .product-info h3 { font-size: 22px; font-weight: 700; color: var(--text-main); margin-bottom: 10px; }
    .product-info > p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 14px; max-width: 520px; }
    .product-meta {
      display: flex; gap: 16px; flex-wrap: wrap;
      font-size: 13px; color: var(--text-muted); margin-bottom: 18px;
    }
    .product-meta span { display: inline-flex; align-items: center; gap: 5px; }
    .product-meta i { color: var(--brand-blue); font-size: 13px; }
    .product-actions { display: flex; gap: 10px; flex-wrap: wrap; }
    .btn-brand-sm {
      background: var(--brand-blue); color: #fff; font-size: 14px; font-weight: 600;
      padding: 10px 22px; border-radius: 10px; border: none;
      transition: all .25s ease;
    }
    .btn-brand-sm:hover { background: var(--brand-blue-dark); color: #fff; transform: translateY(-1px); }
    .btn-outline-sm {
      background: #fff; color: var(--text-secondary); font-size: 14px; font-weight: 500;
      padding: 10px 18px; border-radius: 10px; border: 1px solid var(--border-color);
      transition: all .25s ease;
    }
    .btn-outline-sm:hover { border-color: var(--brand-blue); color: var(--brand-blue); }
    .product-detail {
      margin-top: 18px; background: var(--bg-light);
      border-radius: 12px; padding: 20px; border: 1px solid var(--border-color);
    }
    .param-table { width: 100%; border-collapse: collapse; }
    .param-table tr + tr { border-top: 1px solid var(--border-color); }
    .param-table td { padding: 10px 12px; font-size: 14px; vertical-align: top; }
    .param-key { width: 140px; color: var(--text-muted); font-weight: 500; }
    .param-table td:last-child { color: var(--text-main); font-weight: 500; }

    /* ---------- Capability ---------- */
    .capability-section { background: var(--bg-light); padding: 96px 0; }
    .capability-grid .col-md-6 { margin-bottom: 24px; }
    .capability-card {
      background: #fff; border: 1px solid var(--border-color);
      border-radius: var(--radius-md); padding: 28px;
      box-shadow: var(--shadow-1); transition: all .25s ease; height: 100%;
    }
    .capability-card:hover {
      box-shadow: var(--shadow-2); transform: translateY(-4px);
      border-color: var(--brand-blue);
    }
    .cap-icon {
      width: 48px; height: 48px; background: var(--brand-blue-light);
      color: var(--brand-blue); border-radius: 12px;
      display: flex; align-items: center; justify-content: center;
      font-size: 20px; margin-bottom: 16px;
    }
    .capability-card h3 { font-size: 18px; font-weight: 600; color: var(--text-main); margin-bottom: 10px; }
    .capability-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin: 0; }

    /* ---------- Scenario ---------- */
    .scenario-section { background: var(--bg-white); padding: 96px 0; }
    .scenario-visual {
      border-radius: var(--radius-lg); overflow: hidden;
      border: 1px solid var(--border-color); box-shadow: var(--shadow-1);
    }
    .scenario-visual img { width: 100%; height: 360px; object-fit: cover; }
    .scenario-list { display: flex; flex-direction: column; gap: 20px; margin-top: 32px; }
    .scenario-item {
      display: flex; gap: 18px; align-items: flex-start;
      background: var(--bg-light); border-radius: 14px; padding: 20px 24px;
      border-left: 4px solid var(--brand-blue); transition: all .25s ease;
    }
    .scenario-item:hover { box-shadow: var(--shadow-1); }
    .scenario-icon {
      flex-shrink: 0; width: 44px; height: 44px;
      background: var(--brand-blue); color: #fff;
      border-radius: 10px; display: flex; align-items: center; justify-content: center;
      font-size: 18px;
    }
    .scenario-item h3 { font-size: 17px; font-weight: 600; color: var(--text-main); margin-bottom: 4px; }
    .scenario-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin: 0; }

    /* ---------- Process ---------- */
    .process-section { background: var(--bg-light); padding: 96px 0; }
    .process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
    .process-step {
      background: #fff; border: 1px solid var(--border-color);
      border-radius: var(--radius-md); padding: 28px 24px;
      position: relative; box-shadow: var(--shadow-1);
      transition: all .25s ease;
    }
    .process-step:hover { box-shadow: var(--shadow-2); transform: translateY(-4px); }
    .step-num {
      font-size: 32px; font-weight: 700; color: var(--brand-blue-light);
      line-height: 1; margin-bottom: 16px; letter-spacing: 1px;
    }
    .process-step h3 { font-size: 17px; font-weight: 600; color: var(--text-main); margin-bottom: 8px; }
    .process-step p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin: 0; }
    .process-step::after {
      content: ""; position: absolute; top: 0; left: 0;
      width: 4px; height: 48px; border-radius: 0 0 4px 4px;
      background: var(--accent-amber);
    }

    /* ---------- FAQ ---------- */
    .faq-section { background: var(--bg-white); padding: 96px 0; }
    .faq-section .accordion { max-width: 800px; margin: 0 auto; }
    .accordion-item {
      border: 1px solid var(--border-color) !important;
      border-radius: 12px !important;
      margin-bottom: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-1);
      transition: border-color .25s ease;
    }
    .accordion-item:has(.accordion-button:not(.collapsed)) { border-color: var(--brand-blue) !important; }
    .accordion-button {
      background: #fff; color: var(--text-main);
      font-size: 16px; font-weight: 600;
      padding: 18px 24px;
      box-shadow: none !important;
      transition: all .25s ease;
    }
    .accordion-button:not(.collapsed) {
      background: var(--brand-blue-light);
      color: var(--text-main);
      border-bottom: 1px solid var(--border-color);
    }
    .accordion-button:focus { box-shadow: none; }
    .accordion-button::after {
      background-image: none;
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      content: "\f067";
      color: var(--brand-blue);
      font-size: 14px;
      display: flex; align-items: center; justify-content: center;
      transition: transform .25s ease;
    }
    .accordion-button:not(.collapsed)::after {
      transform: rotate(45deg);
    }
    .accordion-body {
      font-size: 15px; color: var(--text-secondary);
      line-height: 1.8; padding: 20px 24px;
      background: var(--bg-white);
    }

    /* ---------- CTA ---------- */
    .cta-section { background: var(--bg-light); padding: 96px 0; }
    .cta-box {
      background: var(--brand-blue-light);
      border-radius: var(--radius-lg);
      padding: 48px;
    }
    .cta-box h2 { font-size: 26px; font-weight: 700; color: var(--text-main); margin-bottom: 10px; }
    .cta-box > .row > div > p { font-size: 15px; color: var(--text-secondary); margin-bottom: 24px; }
    .dl-group { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 12px; }
    .btn-lg-dl {
      background: var(--accent-amber); color: #fff; font-size: 16px; font-weight: 600;
      padding: 16px 28px; border-radius: 12px; border: none;
      display: inline-flex; align-items: center; gap: 8px;
      min-width: 200px; justify-content: center;
      transition: all .25s ease;
    }
    .btn-lg-dl:hover { background: var(--accent-amber-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-2); }
    .btn-white-dl {
      background: #fff; color: var(--text-main); font-size: 14px; font-weight: 600;
      padding: 14px 20px; border-radius: 10px; border: 1px solid var(--border-color);
      display: inline-flex; align-items: center; gap: 8px;
      transition: all .25s ease;
    }
    .btn-white-dl:hover { border-color: var(--brand-blue); color: var(--brand-blue); }
    .version-note { font-size: 13px; color: var(--text-muted); margin: 0 !important; }
    .qr-box {
      background: #fff; border-radius: var(--radius-md);
      padding: 28px; text-align: center;
      border: 1px solid var(--border-color);
      max-width: 220px; margin-left: auto;
    }
    .qr-placeholder {
      width: 140px; height: 140px; margin: 0 auto 12px;
      background: var(--bg-light); border-radius: 12px;
      border: 1px dashed var(--border-color);
      display: flex; align-items: center; justify-content: center;
      color: var(--text-muted); font-size: 40px;
    }
    .qr-box p { font-size: 13px; color: var(--text-muted); margin: 0; }

    /* ---------- Footer ---------- */
    .site-footer { background: var(--dark-bg); color: #fff; padding-top: 64px; }
    .footer-grid {
      display: grid; grid-template-columns: 2fr 1fr 1fr 1.6fr;
      gap: 40px; padding-bottom: 48px;
    }
    .brand-text-lg {
      display: flex; align-items: center; gap: 10px;
      font-size: 24px; font-weight: 700; color: #fff; margin-bottom: 16px;
    }
    .brand-icon-lg {
      width: 36px; height: 36px; border-radius: 10px;
      background: var(--brand-blue); color: #fff;
      display: flex; align-items: center; justify-content: center; font-size: 17px;
    }
    .footer-brand p { font-size: 14px; color: #B8C6DB; line-height: 1.8; max-width: 320px; }
    .footer-icp { font-size: 12px; color: rgba(255,255,255,.5); margin-top: 12px; }
    .footer-col h4 { font-size: 16px; font-weight: 600; color: #fff; margin-bottom: 16px; }
    .footer-col ul { list-style: none; padding: 0; margin: 0; }
    .footer-col ul li { margin-bottom: 10px; }
    .footer-col ul a { font-size: 14px; color: #B8C6DB; transition: all .25s ease; }
    .footer-col ul a:hover { color: #fff; }
    .footer-subscribe { display: flex; gap: 8px; margin-bottom: 20px; }
    .footer-subscribe input {
      flex: 1; height: 40px; border-radius: 8px; border: 1px solid rgba(255,255,255,.2);
      background: rgba(255,255,255,.1); color: #fff; padding: 0 14px; font-size: 14px;
    }
    .footer-subscribe input::placeholder { color: rgba(255,255,255,.5); }
    .footer-subscribe input:focus { outline: 2px solid var(--brand-blue); border-color: transparent; }
    .btn-subscribe {
      height: 40px; background: var(--accent-amber); color: #fff;
      border: none; border-radius: 8px; padding: 0 20px;
      font-size: 14px; font-weight: 600; transition: all .25s ease;
    }
    .btn-subscribe:hover { background: var(--accent-amber-dark); }
    .footer-contact { font-size: 14px; color: #B8C6DB; margin-bottom: 8px; }
    .footer-contact i { color: var(--accent-amber); margin-right: 8px; width: 16px; }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,.12);
      padding: 20px 0; text-align: center;
      font-size: 12px; color: rgba(255,255,255,.5);
    }

    /* ---------- Responsive ---------- */
    @media (max-width: 1199.98px) {
      .container { padding-left: 20px; padding-right: 20px; }
    }

    @media (max-width: 991.98px) {
      .mega-menu {
        width: 100% !important;
        position: static !important;
        transform: none !important;
        box-shadow: none !important;
        border: 1px solid var(--border-color) !important;
        margin-top: 8px !important;
        padding: 0 !important;
      }
      .mega-grid { grid-template-columns: 1fr; gap: 16px; padding: 16px; }
      .nav-actions { width: 100%; margin-top: 12px; }
      .mega-btn { width: 100%; text-align: center; }
      .page-hero { padding: 64px 0 0; }
      .page-hero h1 { font-size: 32px; }
      .hero-visual { margin-top: 32px; }
      .hero-visual img { height: 280px; }
      .product-item { grid-template-columns: 1fr; gap: 24px; }
      .product-media img { height: 200px; }
      .cta-box { padding: 32px; }
      .qr-box { margin-left: 0; margin-top: 24px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 767.98px) {
      .page-hero { padding: 48px 0 0; }
      .page-hero h1 { font-size: 28px; }
      .hero-sub { font-size: 16px; }
      .trust-item { padding: 8px; }
      .trust-item + .trust-item { border-left: none; }
      .trust-num { font-size: 22px; }
      .process-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
      .product-list-section, .capability-section, .scenario-section,
      .process-section, .faq-section, .cta-section { padding: 56px 0; }
      .dl-group .btn-lg-dl, .dl-group .btn-white-dl { width: 100%; }
      .scenario-visual img { height: 240px; }
      .footer-grid { grid-template-columns: 1fr; gap: 32px; }
      .cta-box { padding: 24px; }
    }

    @media (max-width: 575.98px) {
      .container { padding-left: 16px; padding-right: 16px; }
      .hero-actions .btn-accent, .hero-actions .btn-outline-brand { width: 100%; text-align: center; }
      .process-grid { grid-template-columns: 1fr; }
      .product-item { padding: 28px 0; }
      .product-actions .btn-brand-sm, .product-actions .btn-outline-sm { width: 100%; text-align: center; }
      .param-table td { font-size: 13px; padding: 8px 6px; }
      .section-header h2 { font-size: 22px; }
      .cta-box h2 { font-size: 22px; }
      .brand-text { font-size: 20px; }
    }

/* roulang page: category2 */
:root {
  --primary: #2E7CF6;
  --primary-dark: #1C5FD1;
  --primary-light: #EBF2FE;
  --accent: #F5A524;
  --accent-dark: #D97E00;
  --success: #21A35E;
  --text-main: #17233A;
  --text-sub: #5A6B83;
  --text-weak: #8A97AC;
  --bg-white: #FFFFFF;
  --bg-light: #F5F8FC;
  --border-color: #E1E8F0;
  --dark-bg: #14283F;
  --radius-card: 16px;
  --radius-lg: 20px;
  --radius-btn: 10px;
  --shadow-1: 0 1px 3px rgba(23,35,58,.06), 0 2px 8px rgba(23,35,58,.05);
  --shadow-2: 0 8px 24px rgba(23,35,58,.10), 0 2px 8px rgba(23,35,58,.06);
  --font-main: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-main);
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--primary-dark); text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font-family: inherit; }

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

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

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1050;
  background: rgba(255,255,255,.9);
  border-bottom: 1px solid rgba(225,232,240,.7);
  transition: box-shadow .25s ease, background .25s ease;
}

.site-header.is-scrolled {
  background: var(--bg-white);
  box-shadow: var(--shadow-1);
}

.navbar { padding-top: 0; padding-bottom: 0; min-height: 70px; }

.navbar-brand { padding: 0; margin-right: 0; }

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: .5px;
}

.navbar-nav .nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  padding: 22px 14px !important;
  position: relative;
  transition: color .2s ease;
}

.navbar-nav .nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 8px;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
  opacity: 0;
  transform: scaleX(.4);
  transition: opacity .2s ease, transform .2s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--primary);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
  opacity: 1;
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mega-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  transition: all .2s ease;
}

.mega-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.mega-btn .fa-chevron-down { font-size: 12px; }

.nav-download-btn {
  background: var(--accent) !important;
  border: none;
  color: #fff !important;
  font-weight: 600;
  width: auto;
  height: 38px;
  padding: 0 20px;
  font-size: 14px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background .2s ease, box-shadow .2s ease, transform .2s ease;
}

.nav-download-btn:hover {
  background: var(--accent-dark) !important;
  box-shadow: var(--shadow-2);
  transform: translateY(-1px);
}

.nav-download-btn:active { transform: scale(.97); }

.dropdown-menu.mega-menu {
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-2);
  padding: 20px;
  width: 720px;
  max-width: calc(100vw - 32px);
  right: 0;
  left: auto;
  transition: opacity .2s ease, transform .2s ease;
}

.mega-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr .8fr;
  gap: 24px;
}

.mega-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-weak);
  margin-bottom: 14px;
  letter-spacing: .3px;
}

.mega-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  color: var(--text-main);
  font-size: 14px;
  font-weight: 500;
  transition: color .2s ease;
}

.mega-link i {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--primary-light);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  flex-shrink: 0;
  transition: background .2s ease;
}

.mega-link:hover { color: var(--primary); }
.mega-link:hover i { background: var(--primary); color: #fff; }

.mega-post-link {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  margin-bottom: 4px;
  transition: background .2s ease;
}

.mega-post-link span {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.mega-post-link em {
  display: block;
  font-style: normal;
  font-size: 12px;
  color: var(--text-weak);
  margin-top: 4px;
}

.mega-post-link:hover { background: var(--bg-light); }
.mega-post-link:hover span { color: var(--primary); }

.mega-card {
  background: var(--dark-bg);
  border-radius: 14px;
  padding: 20px;
  color: #fff;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.mega-card h4 { color: #fff; font-size: 16px; margin-bottom: 8px; }
.mega-card p { font-size: 13px; color: #B8C6DB; margin-bottom: 14px; line-height: 1.6; }

.mega-card .btn {
  align-self: flex-start;
  background: var(--accent);
  border: none;
  color: #fff;
  font-weight: 600;
  border-radius: 10px;
  padding: 8px 18px;
  font-size: 13px;
  transition: background .2s ease;
}

.mega-card .btn:hover { background: var(--accent-dark); }

.navbar-toggler {
  border: none;
  padding: 8px;
  border-radius: 8px;
}

.navbar-toggler:focus { box-shadow: none; border: none; }

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(23,35,58,.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ---------- Page Hero ---------- */
.page-hero {
  background-color: var(--bg-light);
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  position: relative;
  padding: 84px 0 76px;
  border-bottom: 1px solid var(--border-color);
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(245,248,252,.88);
}

.page-hero .container { position: relative; z-index: 1; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 20px;
}

.hero-badge i { font-size: 12px; }

.page-hero h1 {
  font-size: 38px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

.hero-sub {
  font-size: 17px;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 520px;
}

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

.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  border: none;
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  height: 52px;
  padding: 0 28px;
  border-radius: 12px;
  transition: all .25s ease;
}

.btn-hero-primary:hover {
  background: var(--accent-dark);
  color: #fff;
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.btn-hero-primary:active { transform: scale(.98); }

.btn-hero-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #fff;
  border: 1.5px solid var(--primary);
  color: var(--primary);
  font-weight: 500;
  font-size: 15px;
  height: 52px;
  padding: 0 26px;
  border-radius: 12px;
  transition: all .2s ease;
}

.btn-hero-secondary:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-color: var(--primary-dark);
}

.hero-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.platform-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--text-sub);
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 6px 16px;
}

.platform-badge i { color: var(--primary); }

.hero-visual {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: var(--shadow-2);
  padding: 10px;
  position: relative;
}

.hero-visual::after {
  content: "";
  display: block;
  height: 8px;
  background: var(--primary-light);
  border-radius: 0 0 16px 16px;
  margin: 10px -10px -10px;
}

.hero-visual img {
  border-radius: 14px;
  width: 100%;
  height: 260px;
  object-fit: cover;
  background: var(--bg-light);
}

/* ---------- Section Common ---------- */
.section {
  padding: 88px 0;
}

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

.section-head {
  margin-bottom: 44px;
}

.section-head .title {
  font-size: 30px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.4;
}

.section-head .desc {
  font-size: 15px;
  color: var(--text-sub);
  max-width: 640px;
  line-height: 1.8;
}

.text-center .section-head .desc { margin-left: auto; margin-right: auto; }

/* ---------- Solutions Matrix ---------- */
.solutions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.solution-card {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 30px;
  display: flex;
  flex-direction: column;
  transition: border-color .25s ease, box-shadow .25s ease, transform .25s ease;
  position: relative;
  overflow: hidden;
}

.solution-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 48px;
  background: var(--accent);
  border-radius: 0 0 4px 0;
}

.solution-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-2);
  transform: translateY(-3px);
}

.solution-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: var(--primary-light);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 22px;
}

.solution-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 12px;
}

.solution-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-sub);
  margin-bottom: 20px;
  flex: 1;
}

.solution-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.solution-meta a.link-detail {
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  transition: color .2s ease;
}

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

.solution-meta .btn-demo {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-sub);
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px 16px;
  transition: all .2s ease;
}

.solution-meta .btn-demo:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--primary-light);
}

/* ---------- Scenarios ---------- */
.scenario-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 64px;
}

.scenario-row:last-child { margin-bottom: 0; }

.scenario-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-1);
}

.scenario-image img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  transition: transform .4s ease;
}

.scenario-image:hover img { transform: scale(1.03); }

.scenario-text .tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
  background: var(--primary-light);
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: 16px;
}

.scenario-text h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 14px;
  line-height: 1.5;
}

.scenario-text p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.85;
  margin-bottom: 18px;
}

.scenario-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.scenario-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-sub);
  padding: 7px 0;
  line-height: 1.6;
}

.scenario-list li i {
  color: var(--success);
  margin-top: 5px;
  font-size: 13px;
  flex-shrink: 0;
}

/* ---------- Process ---------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.process-step {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  position: relative;
  transition: border-color .25s ease, box-shadow .25s ease;
}

.process-step:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-2);
}

.process-step .step-num {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 18px;
}

.process-step .step-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--bg-light);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 16px;
}

.process-step h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 10px;
}

.process-step p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  margin: 0;
}

/* ---------- Stats ---------- */
.stats-section {
  background: var(--dark-bg);
  color: #fff;
  padding: 64px 0;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.stat-item {
  text-align: center;
  padding: 8px 16px;
  border-right: 1px solid rgba(255,255,255,.12);
}

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

.stat-number {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.2;
  color: #fff;
}

.stat-number .suffix { font-size: 26px; color: var(--accent); }

.stat-label {
  font-size: 14px;
  color: #B8C6DB;
  margin-top: 8px;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 14px;
  padding: 0 24px;
  overflow: hidden;
  transition: border-color .2s ease;
}

.faq-item:has(.accordion-button:not(.collapsed)) {
  border-color: var(--primary);
  box-shadow: var(--shadow-1);
}

.accordion-button {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  padding: 18px 0;
  background: transparent;
  box-shadow: none;
  border: none;
}

.accordion-button:not(.collapsed) {
  color: var(--primary);
  background: transparent;
  box-shadow: none;
}

.accordion-button:focus {
  box-shadow: none;
  border: none;
}

.accordion-button::after {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%232E7CF6'%3e%3cpath fill-rule='evenodd' d='M8 4a.5.5 0 0 1 .5.5v3h3a.5.5 0 1 1 0 1h-3v3a.5.5 0 1 1-1 0v-3h-3a.5.5 0 1 1 0-1h3v-3A.5.5 0 0 1 8 4z'/%3e%3c/svg%3e");
  transition: transform .25s ease;
}

.accordion-button:not(.collapsed)::after {
  transform: rotate(45deg);
}

.accordion-body {
  padding: 0 0 20px;
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.8;
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  background: var(--primary-light);
  border-radius: var(--radius-lg);
  padding: 44px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  border: 1px solid rgba(46,124,246,.15);
}

.cta-banner h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-main);
  margin: 0;
}

.cta-banner p {
  font-size: 15px;
  color: var(--text-sub);
  margin: 8px 0 0;
}

.btn-cta-download {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--accent);
  border: none;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  height: 54px;
  padding: 0 32px;
  border-radius: 12px;
  white-space: nowrap;
  transition: all .25s ease;
}

.btn-cta-download:hover {
  background: var(--accent-dark);
  color: #fff;
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.btn-cta-download:active { transform: scale(.98); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--dark-bg);
  color: #B8C6DB;
  padding-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.10);
}

.brand-text-lg {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}

.brand-icon-lg {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 14px;
  color: #B8C6DB;
}

.footer-icp {
  font-size: 12px;
  color: rgba(255,255,255,.45);
}

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

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.footer-col ul li a {
  color: #B8C6DB;
  font-size: 14px;
  transition: color .2s ease;
}

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

.footer-subscribe {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  margin-top: 16px;
}

.footer-subscribe input {
  flex: 1;
  height: 42px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(255,255,255,.08);
  color: #fff;
  padding: 0 14px;
  font-size: 14px;
  min-width: 0;
}

.footer-subscribe input::placeholder { color: rgba(255,255,255,.45); }
.footer-subscribe input:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(255,255,255,.12);
}

.btn-subscribe {
  height: 42px;
  padding: 0 18px;
  border-radius: 8px;
  background: var(--accent);
  border: none;
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
  transition: background .2s ease;
}

.btn-subscribe:hover { background: var(--accent-dark); }

.footer-contact {
  font-size: 14px;
  color: #B8C6DB;
  margin-bottom: 8px;
}

.footer-contact i { color: var(--primary); margin-right: 8px; }

.footer-bottom {
  text-align: center;
  padding: 20px 0;
  font-size: 12px;
  color: rgba(255,255,255,.4);
}

/* ---------- Responsive ---------- */
@media (max-width: 991px) {
  .hero-grid { grid-template-columns: 1fr; }
  .page-hero { padding: 60px 0; }
  .hero-visual { max-width: 540px; }

  .scenario-row { grid-template-columns: 1fr; gap: 32px; }
  .scenario-row .scenario-image { order: -1; }

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

  .stats-row { grid-template-columns: 1fr 1fr; gap: 24px; }
  .stat-item { border-right: none; padding: 12px 0; }

  .navbar-collapse {
    background: #fff;
    border-radius: 0 0 16px 16px;
    box-shadow: var(--shadow-2);
    padding: 16px 20px;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    z-index: 1040;
  }

  .navbar-nav .nav-link { padding: 14px 0 !important; border-bottom: 1px solid var(--bg-light); }
  .navbar-nav .nav-link::after { display: none; }

  .nav-actions { padding-top: 12px; flex-direction: column; align-items: stretch; gap: 10px; }
  .nav-actions .mega-trigger { width: 100%; }
  .mega-btn { width: 100%; justify-content: center; border-radius: 10px; padding: 12px; }
  .nav-download-btn { justify-content: center; height: 44px; }
}

@media (max-width: 767px) {
  .section { padding: 56px 0; }
  .section-head .title { font-size: 24px; }
  .page-hero h1 { font-size: 28px; }

  .solutions-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .cta-banner { flex-direction: column; align-items: flex-start; padding: 28px 24px; }
  .btn-cta-download { width: 100%; justify-content: center; }

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

  .dropdown-menu.mega-menu {
    width: 100%;
    max-width: none;
    position: static;
    box-shadow: none;
    border: 1px solid var(--border-color);
    margin-top: 8px;
  }

  .mega-grid { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 575px) {
  .container { padding-left: 16px; padding-right: 16px; }

  .page-hero h1 { font-size: 26px; }
  .hero-sub { font-size: 15px; }
  .btn-hero-primary, .btn-hero-secondary { width: 100%; }

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

  .stats-row { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-number { font-size: 30px; }
  .stat-label { font-size: 12px; }

  .scenario-image img { height: 200px; }
  .faq-item { padding: 0 18px; }
  .cta-banner h2 { font-size: 22px; }
}