/* roulang page: index */
:root {
  --primary: #2E6BED;
  --primary-dark: #1F54C4;
  --primary-light: #EAF1FE;
  --accent: #FF6B35;
  --teal: #12A5A0;
  --bg: #F7F9FC;
  --card: #FFFFFF;
  --title: #1F2D3D;
  --body: #3D4C5C;
  --muted: #8A94A6;
  --border: #E1E8F0;
  --success: #22C55E;
  --warning: #F59E0B;
  --error: #EF4444;
  --radius-card: 16px;
  --radius-btn: 12px;
  --radius-badge: 6px;
  --shadow-card: 0 4px 16px rgba(30,60,90,0.06);
  --shadow-card-hover: 0 14px 32px rgba(30,60,90,0.12);
  --shadow-btn: 0 4px 14px rgba(46,107,237,0.25);
  --focus-ring: 0 0 0 3px rgba(46,107,237,0.2);
  --max-width: 1200px;
  --spacing-section: 80px;
  --spacing-mobile: 56px;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font-stack); font-size: 16px; line-height: 1.75; color: var(--body); background-color: var(--bg); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--primary-dark); }
ul, ol { list-style: none; }
button, input { font-family: inherit; font-size: inherit; border: none; outline: none; background: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section-pad { padding: var(--spacing-section) 0; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: 72px;
}
.header-inner { display: flex; align-items: center; height: 72px; gap: 32px; }
.logo { flex-shrink: 0; }
.logo a { display: flex; align-items: center; gap: 10px; }
.logo-icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 16px;
  box-shadow: 0 4px 12px rgba(46,107,237,0.3);
}
.logo-text { font-size: 18px; font-weight: 700; color: var(--title); letter-spacing: -0.3px; }
.logo-text .highlight { color: var(--primary); }
.main-nav { display: flex; gap: 32px; margin-left: 8px; }
.main-nav .nav-link {
  font-size: 15px; font-weight: 500; color: var(--body);
  padding: 24px 0; position: relative; transition: color 0.2s ease;
}
.main-nav .nav-link:hover { color: var(--primary); }
.main-nav .nav-link.active { color: var(--primary); }
.main-nav .nav-link.active::after {
  content: ''; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 2px; background: var(--primary); border-radius: 2px;
}
.header-actions { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.search-box {
  display: flex; align-items: center; gap: 8px;
  background: #F1F5F9; border: 1px solid transparent;
  border-radius: 999px; padding: 0 16px; height: 40px; width: 240px;
  transition: all 0.3s ease;
}
.search-box i { color: var(--muted); font-size: 14px; }
.search-box input { flex: 1; background: transparent; font-size: 14px; color: var(--title); }
.search-box input::placeholder { color: var(--muted); }
.search-box:focus-within {
  background: #fff; border-color: var(--primary);
  box-shadow: var(--focus-ring); width: 260px;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: var(--radius-btn); font-weight: 600; cursor: pointer;
  transition: all 0.25s ease; text-align: center;
}
.btn-primary {
  background: var(--primary); color: #fff; padding: 12px 24px;
  box-shadow: var(--shadow-btn);
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; box-shadow: 0 6px 20px rgba(46,107,237,0.35); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(1px); box-shadow: 0 2px 8px rgba(46,107,237,0.2); }
.btn-primary:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn-secondary {
  background: #fff; color: var(--primary); border: 1.5px solid var(--primary);
  padding: 12px 24px;
}
.btn-secondary:hover { background: var(--primary-light); color: var(--primary-dark); transform: translateY(-1px); }
.btn-secondary:active { transform: translateY(1px); }
.btn-secondary:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-lg { padding: 14px 32px; font-size: 16px; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #E85A2A; color: #fff; transform: translateY(-1px); }
.menu-toggle { display: none; font-size: 20px; color: var(--title); cursor: pointer; padding: 8px; border-radius: 8px; }
.menu-toggle:hover { background: var(--primary-light); }

/* Hero */
.hero {
  position: relative;
  background: linear-gradient(135deg, #F2F7FD 0%, #F7F9FC 50%, #EAF1FE 100%);
  padding: 96px 0 88px;
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -120px; right: -80px;
  width: 400px; height: 400px; border-radius: 50%;
  background: radial-gradient(circle, rgba(46,107,237,0.08) 0%, transparent 70%);
}
.hero::after {
  content: ''; position: absolute; bottom: -60px; left: 10%;
  width: 300px; height: 300px; border-radius: 50%;
  background: radial-gradient(circle, rgba(18,165,160,0.06) 0%, transparent 70%);
}
.hero-inner { display: flex; align-items: center; gap: 64px; position: relative; z-index: 2; }
.hero-content { flex: 1.3; }
.hero-content h1 {
  font-size: 40px; font-weight: 700; line-height: 1.3; color: var(--title);
  margin-bottom: 20px; letter-spacing: -0.5px;
}
.hero-content h1 .highlight { color: var(--primary); position: relative; }
.hero-content h1 .highlight::after {
  content: ''; position: absolute; left: 0; bottom: 4px;
  width: 100%; height: 8px; background: rgba(46,107,237,0.12);
  border-radius: 4px; z-index: -1;
}
.hero-subtitle {
  font-size: 17px; color: var(--body); line-height: 1.75;
  max-width: 540px; margin-bottom: 32px;
}
.hero-actions { display: flex; gap: 16px; margin-bottom: 32px; flex-wrap: wrap; }
.hero-tags { display: flex; gap: 12px; flex-wrap: wrap; }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--primary-light); color: var(--primary);
  font-size: 13px; font-weight: 500; padding: 6px 14px;
  border-radius: var(--radius-badge); border: 1px solid rgba(46,107,237,0.1);
}
.badge i { font-size: 12px; }
.hero-image { flex: 0.7; }
.hero-image .img-wrap {
  border-radius: 24px; overflow: hidden;
  box-shadow: 0 20px 48px rgba(30,60,90,0.15);
  position: relative; aspect-ratio: 4/3; background: var(--primary-light);
}
.hero-image img { width: 100%; height: 100%; object-fit: cover; }
.hero-image .float-card {
  position: absolute; bottom: 24px; left: -32px;
  background: rgba(255,255,255,0.95); backdrop-filter: blur(8px);
  border-radius: 14px; padding: 14px 20px;
  box-shadow: 0 8px 24px rgba(30,60,90,0.12);
  display: flex; align-items: center; gap: 12px;
}
.hero-image .float-card .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); box-shadow: 0 0 0 3px rgba(34,197,94,0.2); }
.hero-image .float-card span { font-size: 14px; font-weight: 600; color: var(--title); }

/* Trust Bar */
.trust-bar { background: #fff; border-bottom: 1px solid var(--border); padding: 28px 0; }
.trust-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.trust-item { display: flex; align-items: center; gap: 12px; }
.trust-item .icon-circle {
  width: 44px; height: 44px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0;
}
.trust-item .bg-blue { background: var(--primary-light); color: var(--primary); }
.trust-item .bg-teal { background: rgba(18,165,160,0.1); color: var(--teal); }
.trust-item .bg-orange { background: rgba(255,107,53,0.1); color: var(--accent); }
.trust-item .bg-green { background: rgba(34,197,94,0.1); color: var(--success); }
.trust-item .num { font-size: 22px; font-weight: 700; color: var(--title); line-height: 1.2; }
.trust-item .label { font-size: 13px; color: var(--muted); }

/* Story Section */
.story-section { background: var(--bg); }
.story-inner { display: flex; align-items: center; gap: 64px; }
.story-content { flex: 1; }
.story-content .section-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary-light); color: var(--primary);
  font-size: 13px; font-weight: 600; padding: 6px 16px;
  border-radius: 999px; margin-bottom: 16px;
}
.story-content h2 { font-size: 30px; font-weight: 700; color: var(--title); line-height: 1.3; margin-bottom: 20px; }
.story-content p { font-size: 16px; line-height: 1.75; color: var(--body); margin-bottom: 16px; }
.story-list { margin-top: 20px; display: grid; gap: 12px; }
.story-list li { display: flex; align-items: flex-start; gap: 12px; font-size: 15px; color: var(--body); }
.story-list li i { color: var(--teal); font-size: 14px; margin-top: 5px; flex-shrink: 0; }
.story-image { flex: 1; }
.story-image .img-wrap {
  border-radius: 24px; overflow: hidden;
  box-shadow: var(--shadow-card); position: relative; aspect-ratio: 16/11; background: var(--primary-light);
}
.story-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.story-image .img-wrap:hover img { transform: scale(1.03); }

/* Steps Section */
.steps-section { background: #fff; }
.steps-header { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.steps-header .section-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary-light); color: var(--primary);
  font-size: 13px; font-weight: 600; padding: 6px 16px;
  border-radius: 999px; margin-bottom: 16px;
}
.steps-header h2 { font-size: 30px; font-weight: 700; color: var(--title); line-height: 1.3; }
.steps-header p { color: var(--muted); margin-top: 12px; }
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-card {
  position: relative; background: var(--card);
  border: 1px solid var(--border); border-radius: var(--radius-card);
  padding: 32px 24px; transition: all 0.3s ease; text-align: left;
}
.step-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-4px); border-color: rgba(46,107,237,0.3); }
.step-num {
  font-size: 40px; font-weight: 800; color: var(--primary-light);
  line-height: 1; margin-bottom: 16px; display: block;
}
.step-card h3 { font-size: 17px; font-weight: 600; color: var(--title); margin-bottom: 10px; }
.step-card p { font-size: 14px; color: var(--muted); line-height: 1.6; }
.step-line {
  position: absolute; top: 50%; right: -12px; transform: translateY(-50%);
  color: var(--border); font-size: 18px; z-index: 2;
}
.step-card:last-child .step-line { display: none; }

/* News Section */
.news-section { background: var(--bg); }
.news-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 40px; flex-wrap: wrap; }
.news-header .left .section-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary-light); color: var(--primary);
  font-size: 13px; font-weight: 600; padding: 6px 16px;
  border-radius: 999px; margin-bottom: 12px;
}
.news-header h2 { font-size: 30px; font-weight: 700; color: var(--title); line-height: 1.3; }
.news-header .right { color: var(--muted); font-size: 14px; }
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.news-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 24px;
  transition: all 0.3s ease; display: flex; flex-direction: column;
}
.news-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-4px); border-color: rgba(46,107,237,0.3); }
.news-tag {
  display: inline-flex; align-items: center;
  background: var(--primary-light); color: var(--primary);
  font-size: 12px; font-weight: 600; padding: 4px 12px;
  border-radius: var(--radius-badge); align-self: flex-start; margin-bottom: 14px;
}
.news-card h3 { font-size: 18px; font-weight: 600; color: var(--title); line-height: 1.4; margin-bottom: 10px; }
.news-card h3 a { color: inherit; }
.news-card h3 a:hover { color: var(--primary); }
.news-excerpt {
  font-size: 14px; color: var(--muted); line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; margin-bottom: 18px; flex: 1;
}
.news-meta { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--border); padding-top: 14px; }
.news-meta .time { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.news-meta .read-more { font-size: 14px; font-weight: 600; color: var(--primary); }
.news-meta .read-more:hover { color: var(--primary-dark); }
.empty-state {
  grid-column: 1 / -1; text-align: center; padding: 48px 24px;
  background: var(--card); border: 1px dashed var(--border); border-radius: var(--radius-card);
  color: var(--muted);
}
.empty-state i { font-size: 40px; margin-bottom: 16px; color: var(--border); display: block; }
.empty-state p { font-size: 16px; }

/* Advantage Section */
.advantage-section { background: #fff; }
.advantage-inner { display: flex; gap: 64px; align-items: stretch; }
.advantage-left { flex: 0.85; display: flex; flex-direction: column; gap: 20px; }
.advantage-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 28px; flex: 1;
  transition: all 0.3s ease;
}
.advantage-card:hover { border-color: rgba(46,107,237,0.3); box-shadow: var(--shadow-card); }
.advantage-card .big-num { font-size: 42px; font-weight: 800; color: var(--primary); line-height: 1; }
.advantage-card .desc { font-size: 14px; color: var(--muted); margin-top: 8px; }
.advantage-card.highlight { background: linear-gradient(135deg, var(--primary-light) 0%, #fff 100%); border-color: rgba(46,107,237,0.2); }
.advantage-right { flex: 1.15; }
.advantage-right .section-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary-light); color: var(--primary);
  font-size: 13px; font-weight: 600; padding: 6px 16px;
  border-radius: 999px; margin-bottom: 14px;
}
.advantage-right h2 { font-size: 30px; font-weight: 700; color: var(--title); line-height: 1.3; margin-bottom: 20px; }
.advantage-list { display: grid; gap: 0; }
.advantage-item {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 18px 0; border-bottom: 1px solid var(--border);
  transition: padding 0.25s ease;
}
.advantage-item:last-child { border-bottom: none; }
.advantage-item:hover { padding-left: 8px; }
.advantage-item .icon-box {
  width: 44px; height: 44px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0;
}
.advantage-item h4 { font-size: 16px; font-weight: 600; color: var(--title); margin-bottom: 4px; }
.advantage-item p { font-size: 14px; color: var(--muted); line-height: 1.6; }

/* FAQ */
.faq-section { background: var(--bg); }
.faq-header { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.faq-header .section-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary-light); color: var(--primary);
  font-size: 13px; font-weight: 600; padding: 6px 16px;
  border-radius: 999px; margin-bottom: 16px;
}
.faq-header h2 { font-size: 30px; font-weight: 700; color: var(--title); line-height: 1.3; }
.faq-list { max-width: 760px; margin: 0 auto; display: grid; gap: 14px; }
.faq-item {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; overflow: hidden; transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.faq-item:hover { border-color: var(--primary); }
.faq-item.active { border-color: var(--primary); box-shadow: var(--shadow-card); }
.faq-question {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; font-size: 16px; font-weight: 600; color: var(--title);
  cursor: pointer; text-align: left; transition: color 0.2s ease;
}
.faq-question:hover { color: var(--primary); }
.faq-question i { font-size: 14px; color: var(--muted); transition: transform 0.3s ease; }
.faq-item.active .faq-question i { transform: rotate(45deg); color: var(--primary); }
.faq-answer { padding: 0 24px; max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; }
.faq-item.active .faq-answer { max-height: 300px; padding: 0 24px 20px; }
.faq-answer p { font-size: 14px; color: var(--body); line-height: 1.75; }

/* CTA */
.cta-section { background: #fff; padding: 80px 0; }
.cta-box {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: 24px; padding: 56px 48px; position: relative; overflow: hidden;
}
.cta-box::before {
  content: ''; position: absolute; top: -40px; right: -40px;
  width: 200px; height: 200px; border-radius: 50%;
  background: rgba(255,255,255,0.08);
}
.cta-box::after {
  content: ''; position: absolute; bottom: -60px; left: 20%;
  width: 160px; height: 160px; border-radius: 50%;
  background: rgba(255,255,255,0.05);
}
.cta-inner { position: relative; z-index: 2; display: flex; align-items: center; gap: 48px; flex-wrap: wrap; }
.cta-text { flex: 1; min-width: 280px; }
.cta-text h2 { font-size: 28px; font-weight: 700; color: #fff; line-height: 1.4; margin-bottom: 12px; }
.cta-text p { color: rgba(255,255,255,0.9); font-size: 15px; line-height: 1.7; }
.cta-form { flex: 1; min-width: 260px; display: flex; gap: 12px; flex-wrap: wrap; }
.cta-form input {
  flex: 1; min-width: 200px; height: 48px; border-radius: 12px;
  padding: 0 18px; background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3); color: #fff; font-size: 14px;
  transition: all 0.25s ease;
}
.cta-form input::placeholder { color: rgba(255,255,255,0.7); }
.cta-form input:focus { background: rgba(255,255,255,0.25); border-color: #fff; box-shadow: 0 0 0 3px rgba(255,255,255,0.2); }
.btn-white {
  background: #fff; color: var(--primary); padding: 12px 24px;
  border-radius: 12px; font-weight: 600; font-size: 15px;
  display: inline-flex; align-items: center; gap: 8px;
  transition: all 0.25s ease; white-space: nowrap;
}
.btn-white:hover { background: var(--primary-light); color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.15); }

/* Footer */
.site-footer {
  background: #F1F5F9; border-top: 1px solid var(--border);
  padding: 56px 0 0;
}
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; padding-bottom: 40px; }
.footer-brand .logo-text { font-size: 18px; font-weight: 700; color: var(--title); margin-bottom: 12px; display: block; }
.footer-brand .logo-text .highlight { color: var(--primary); }
.footer-brand p { font-size: 14px; color: var(--muted); line-height: 1.7; max-width: 300px; }
.footer-col h4 { font-size: 15px; font-weight: 600; color: var(--title); margin-bottom: 16px; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { font-size: 14px; color: var(--body); }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--border); padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--muted);
}
.footer-bottom .links { display: flex; gap: 24px; }
.footer-bottom .links a { color: var(--muted); font-size: 13px; }
.footer-bottom .links a:hover { color: var(--primary); }

/* Mobile menu overlay */
.mobile-menu {
  display: none; position: fixed; top: 72px; left: 0; right: 0;
  background: rgba(255,255,255,0.98); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border); padding: 24px;
  box-shadow: 0 16px 32px rgba(30,60,90,0.1); z-index: 99;
}
.mobile-menu.open { display: block; }
.mobile-menu .mobile-nav { display: grid; gap: 4px; }
.mobile-menu .mobile-nav a {
  padding: 14px 16px; border-radius: 12px; font-size: 16px;
  font-weight: 500; color: var(--body);
}
.mobile-menu .mobile-nav a:hover { background: var(--primary-light); color: var(--primary); }
.mobile-menu .mobile-nav a.active { background: var(--primary-light); color: var(--primary); }
.mobile-menu .mobile-search {
  display: flex; align-items: center; gap: 10px;
  background: #F1F5F9; border-radius: 12px; padding: 0 16px;
  height: 44px; margin-top: 16px;
}
.mobile-menu .mobile-search input { flex: 1; background: transparent; font-size: 14px; color: var(--title); }
.mobile-menu .mobile-search i { color: var(--muted); }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 1024px) {
  .header-inner { gap: 20px; }
  .main-nav { gap: 20px; }
  .search-box { width: 200px; }
  .search-box:focus-within { width: 220px; }
  .hero-inner, .story-inner, .advantage-inner { flex-direction: column; gap: 40px; }
  .hero-content h1 { font-size: 36px; }
  .hero-image .float-card { left: 16px; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .step-line { display: none; }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .cta-box { padding: 40px 32px; }
}
@media (max-width: 768px) {
  .section-pad { padding: var(--spacing-mobile) 0; }
  .main-nav { display: none; }
  .search-box { display: none; }
  .menu-toggle { display: block; }
  .btn-sm { padding: 10px 16px; font-size: 14px; }
  .hero { padding: 64px 0 56px; }
  .hero-content h1 { font-size: 30px; }
  .hero-subtitle { font-size: 16px; }
  .hero-actions .btn-lg { padding: 12px 24px; font-size: 15px; }
  .trust-inner { justify-content: center; gap: 20px; }
  .trust-item { flex: 1 1 calc(50% - 20px); justify-content: center; }
  .steps-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .story-content h2, .steps-header h2, .news-header h2, .advantage-right h2, .faq-header h2 { font-size: 24px; }
  .cta-inner { flex-direction: column; gap: 24px; }
  .cta-form { flex-direction: column; }
  .cta-form input, .cta-form .btn-white { width: 100%; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { justify-content: center; text-align: center; }
  .footer-bottom .links { justify-content: center; flex-wrap: wrap; }
  .step-num { font-size: 32px; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .logo-text { font-size: 16px; }
  .header-actions .btn-sm { padding: 8px 14px; font-size: 13px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn-lg { width: 100%; }
  .hero-image .float-card { left: 12px; bottom: 12px; padding: 10px 14px; }
  .hero-image .float-card span { font-size: 13px; }
  .news-card { padding: 20px; }
  .cta-box { padding: 32px 20px; border-radius: 18px; }
  .faq-question { font-size: 15px; padding: 16px 18px; }
  .faq-answer { padding: 0 18px; }
  .faq-item.active .faq-answer { padding: 0 18px 18px; }
}

/* roulang page: category1 */
/* ===== CSS Variables ===== */
    :root {
      --primary: #2E6BED;
      --primary-dark: #1F54C4;
      --primary-light: #EAF1FE;
      --accent: #FF6B35;
      --teal: #12A5A0;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --title: #1F2D3D;
      --body: #3D4C5C;
      --muted: #8A94A6;
      --border: #E1E8F0;
      --success: #22C55E;
      --warning: #F59E0B;
      --danger: #EF4444;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 6px;
      --shadow: 0 4px 16px rgba(30,60,90,0.06);
      --shadow-hover: 0 14px 32px rgba(30,60,90,0.12);
      --shadow-btn: 0 4px 14px rgba(46,107,237,0.25);
      --container: 1200px;
      --spacer: 80px;
      --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }

    /* ===== Reset & Base ===== */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font);
      background: var(--bg);
      color: var(--body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    ul, ol {
      list-style: none;
    }
    input, button, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
    }
    button {
      cursor: pointer;
      background: none;
    }

    /* ===== Container ===== */
    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ===== Typography ===== */
    h1, h2, h3, h4 {
      color: var(--title);
      font-weight: 700;
      line-height: 1.3;
    }
    h1 {
      font-size: 40px;
    }
    h2 {
      font-size: 30px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }

    /* ===== Buttons ===== */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 24px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 15px;
      line-height: 1.4;
      transition: all 0.22s ease;
      white-space: nowrap;
    }
    .btn i {
      font-size: 14px;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: var(--shadow-btn);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 20px rgba(46,107,237,0.32);
      transform: translateY(-1px);
    }
    .btn-primary:active {
      transform: translateY(0);
    }
    .btn-primary:focus-visible {
      box-shadow: 0 0 0 3px rgba(46,107,237,0.2);
    }
    .btn-secondary {
      background: #fff;
      color: var(--primary);
      border: 1px solid var(--primary);
    }
    .btn-secondary:hover {
      background: var(--primary-light);
    }
    .btn-secondary:focus-visible {
      box-shadow: 0 0 0 3px rgba(46,107,237,0.2);
    }
    .btn-accent {
      background: var(--accent);
      color: #fff;
      box-shadow: 0 4px 14px rgba(255,107,53,0.25);
    }
    .btn-accent:hover {
      background: #e55a2b;
      transform: translateY(-1px);
    }

    /* ===== Header & Nav ===== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      height: 72px;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border);
    }
    .nav-wrap {
      display: flex;
      align-items: center;
      height: 72px;
      gap: 32px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .logo-mark {
      width: 40px;
      height: 40px;
      border-radius: 12px;
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 18px;
      box-shadow: 0 4px 12px rgba(46,107,237,0.24);
    }
    .logo-text {
      font-size: 18px;
      font-weight: 700;
      color: var(--title);
      letter-spacing: 0.2px;
    }
    .logo-text span {
      color: var(--primary);
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 32px;
      flex: 1;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--body);
      padding: 8px 0;
      position: relative;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-left: auto;
      flex-shrink: 0;
    }
    .search-box {
      position: relative;
      width: 240px;
    }
    .search-box input {
      width: 100%;
      height: 42px;
      padding: 0 16px 0 42px;
      border-radius: 999px;
      background: #F1F5F9;
      border: 1px solid transparent;
      color: var(--title);
      font-size: 14px;
      transition: all 0.25s ease;
    }
    .search-box input::placeholder {
      color: var(--muted);
    }
    .search-box input:hover {
      background: #EAEFF5;
    }
    .search-box input:focus {
      background: #fff;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(46,107,237,0.15);
    }
    .search-box > i {
      position: absolute;
      left: 15px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--muted);
      font-size: 14px;
    }
    .nav-console {
      width: 40px;
      height: 40px;
      border-radius: 12px;
      background: #F1F5F9;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--body);
      font-size: 15px;
      transition: all 0.2s ease;
    }
    .nav-console:hover {
      background: var(--primary-light);
      color: var(--primary);
    }
    .nav-cta {
      padding: 10px 20px;
      font-size: 14px;
    }
    .hamburger {
      display: none;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      background: #F1F5F9;
      color: var(--title);
      font-size: 18px;
      align-items: center;
      justify-content: center;
      transition: background 0.2s;
    }
    .hamburger:hover {
      background: var(--primary-light);
    }

    /* ===== Hero ===== */
    .hero {
      position: relative;
      padding: 100px 0 90px;
      background: linear-gradient(135deg, rgba(237,245,255,0.96) 0%, rgba(247,249,252,0.94) 60%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -120px;
      right: -100px;
      width: 420px;
      height: 420px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(46,107,237,0.08) 0%, transparent 70%);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--primary-light);
      color: var(--primary);
      padding: 6px 16px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .hero-badge i {
      font-size: 12px;
    }
    .hero h1 {
      font-size: 42px;
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .hero h1 .highlight {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 17px;
      color: var(--body);
      max-width: 500px;
      margin-bottom: 28px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      position: relative;
    }
    .hero-image img {
      border-radius: 20px;
      box-shadow: 0 16px 40px rgba(30,60,90,0.15);
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .hero-image-float {
      position: absolute;
      bottom: -18px;
      left: -18px;
      background: #fff;
      border-radius: 14px;
      padding: 14px 18px;
      box-shadow: 0 8px 24px rgba(30,60,90,0.12);
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 14px;
      color: var(--title);
      font-weight: 600;
    }
    .hero-image-float i {
      color: var(--success);
      font-size: 18px;
    }

    /* ===== Stats Bar ===== */
    .stats-bar {
      background: #fff;
      border-bottom: 1px solid var(--border);
      padding: 32px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-item {
      text-align: center;
      position: relative;
    }
    .stat-item:not(:last-child)::after {
      content: '';
      position: absolute;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 1px;
      height: 40px;
      background: var(--border);
    }
    .stat-num {
      font-size: 30px;
      font-weight: 700;
      color: var(--title);
      line-height: 1.2;
    }
    .stat-num span {
      color: var(--primary);
    }
    .stat-label {
      font-size: 14px;
      color: var(--muted);
      margin-top: 6px;
    }

    /* ===== Section ===== */
    .section {
      padding: var(--spacer) 0;
    }
    .section-alt {
      background: #fff;
    }
    .section-head {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 56px;
    }
    .section-head .tag {
      display: inline-block;
      background: var(--primary-light);
      color: var(--primary);
      padding: 5px 14px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 14px;
    }
    .section-head h2 {
      margin-bottom: 12px;
    }
    .section-head p {
      color: var(--muted);
      font-size: 16px;
    }

    /* ===== 分类说明区 ===== */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .intro-content h2 {
      margin-bottom: 16px;
    }
    .intro-content > p {
      color: var(--body);
      margin-bottom: 20px;
    }
    .intro-list {
      margin-top: 20px;
    }
    .intro-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 10px 0;
      color: var(--body);
      font-size: 15px;
    }
    .intro-list li i {
      color: var(--primary);
      margin-top: 4px;
      font-size: 15px;
    }
    .intro-image img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* ===== Advantage Cards ===== */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .adv-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      border: 1px solid transparent;
      box-shadow: var(--shadow);
      transition: all 0.3s ease;
    }
    .adv-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: rgba(46,107,237,0.25);
    }
    .adv-icon {
      width: 56px;
      height: 56px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
    }
    .adv-icon.blue {
      background: var(--primary-light);
      color: var(--primary);
    }
    .adv-icon.teal {
      background: rgba(18,165,160,0.12);
      color: var(--teal);
    }
    .adv-icon.orange {
      background: rgba(255,107,53,0.12);
      color: var(--accent);
    }
    .adv-card h3 {
      margin-bottom: 12px;
    }
    .adv-card p {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.7;
    }

    /* ===== Timeline ===== */
    .timeline {
      max-width: 880px;
      margin: 0 auto;
      position: relative;
    }
    .timeline::before {
      content: '';
      position: absolute;
      left: 28px;
      top: 0;
      bottom: 0;
      width: 2px;
      background: var(--border);
    }
    .timeline-item {
      display: flex;
      gap: 28px;
      padding: 20px 0;
      position: relative;
    }
    .timeline-dot {
      width: 58px;
      height: 58px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 700;
      flex-shrink: 0;
      border: 2px solid #fff;
      box-shadow: 0 0 0 2px var(--primary);
      z-index: 1;
    }
    .timeline-content {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 24px 28px;
      box-shadow: var(--shadow);
      flex: 1;
      border-left: 3px solid var(--primary);
      transition: all 0.25s ease;
    }
    .timeline-content:hover {
      box-shadow: var(--shadow-hover);
    }
    .timeline-content h3 {
      margin-bottom: 6px;
      font-size: 18px;
    }
    .timeline-content p {
      color: var(--muted);
      font-size: 14px;
    }

    /* ===== Scenario Cards ===== */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .scene-card {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 28px 32px;
      border: 1px solid var(--border);
      display: flex;
      gap: 20px;
      transition: all 0.25s ease;
    }
    .scene-card:hover {
      border-color: rgba(46,107,237,0.35);
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .scene-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      flex-shrink: 0;
    }
    .scene-card h3 {
      font-size: 17px;
      margin-bottom: 6px;
    }
    .scene-card p {
      color: var(--muted);
      font-size: 14px;
    }

    /* ===== FAQ ===== */
    .faq-wrap {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: #fff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      margin-bottom: 16px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }
    .faq-item:hover {
      border-color: var(--primary);
    }
    .faq-item.open {
      border-color: var(--primary);
      box-shadow: var(--shadow);
    }
    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--title);
      background: transparent;
      text-align: left;
    }
    .faq-question i {
      color: var(--muted);
      transition: transform 0.3s ease;
      font-size: 14px;
    }
    .faq-item.open .faq-question i {
      transform: rotate(45deg);
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: var(--body);
      font-size: 14px;
      line-height: 1.75;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
      padding-bottom: 20px;
    }

    /* ===== CTA ===== */
    .cta-section {
      padding: 0 0 var(--spacer);
    }
    .cta-box {
      background: #fff;
      border-radius: 24px;
      padding: 56px 48px;
      text-align: center;
      box-shadow: var(--shadow);
      border: 1px solid var(--border);
      position: relative;
      overflow: hidden;
    }
    .cta-box::before {
      content: '';
      position: absolute;
      top: -80px;
      left: -80px;
      width: 200px;
      height: 200px;
      border-radius: 50%;
      background: rgba(46,107,237,0.06);
    }
    .cta-box::after {
      content: '';
      position: absolute;
      bottom: -60px;
      right: -60px;
      width: 160px;
      height: 160px;
      border-radius: 50%;
      background: rgba(255,107,53,0.06);
    }
    .cta-box h2 {
      margin-bottom: 12px;
      position: relative;
      z-index: 1;
    }
    .cta-box > p {
      color: var(--muted);
      max-width: 520px;
      margin: 0 auto 32px;
      position: relative;
      z-index: 1;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      justify-content: center;
      flex-wrap: wrap;
      position: relative;
      z-index: 1;
    }
    .cta-form input {
      width: 320px;
      height: 48px;
      padding: 0 18px;
      border-radius: var(--radius-md);
      border: 1px solid #D5DEEB;
      background: var(--bg);
      font-size: 14px;
      transition: all 0.2s ease;
    }
    .cta-form input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(46,107,237,0.15);
      background: #fff;
    }
    .cta-form input::placeholder {
      color: var(--muted);
    }
    .cta-form .btn {
      height: 48px;
    }

    /* ===== Footer ===== */
    .site-footer {
      background: #fff;
      border-top: 1px solid var(--border);
      padding-top: 64px;
    }
    .footer-inner {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 48px;
      padding-bottom: 40px;
    }
    .footer-brand .logo-text {
      font-size: 20px;
      margin-bottom: 16px;
      display: inline-block;
    }
    .footer-brand p {
      color: var(--muted);
      font-size: 14px;
      max-width: 340px;
      margin-top: 12px;
      line-height: 1.7;
    }
    .footer-col h4 {
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--title);
    }
    .footer-col ul {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-col a {
      color: var(--muted);
      font-size: 14px;
    }
    .footer-col a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid var(--border);
      padding: 20px 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 13px;
      color: var(--muted);
      flex-wrap: wrap;
      gap: 12px;
    }
    .footer-bottom .links {
      display: flex;
      gap: 20px;
    }
    .footer-bottom .links a:hover {
      color: var(--primary);
    }

    /* ===== Mobile Menu ===== */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      background: #fff;
      border-bottom: 1px solid var(--border);
      padding: 20px 24px;
      z-index: 99;
      box-shadow: 0 8px 24px rgba(30,60,90,0.08);
    }
    .mobile-menu.open {
      display: block;
    }
    .mobile-menu a {
      display: block;
      padding: 12px 0;
      font-size: 16px;
      font-weight: 500;
      color: var(--title);
      border-bottom: 1px solid var(--border);
    }
    .mobile-menu a:last-child {
      border-bottom: none;
    }
    .mobile-menu a.active {
      color: var(--primary);
    }

    /* ===== Focus Visible ===== */
    a:focus-visible,
    button:focus-visible {
      outline: 3px solid rgba(46,107,237,0.3);
      outline-offset: 2px;
      border-radius: 4px;
    }

    /* ===== Responsive ===== */
    @media (max-width: 1200px) {
      .search-box {
        width: 200px;
      }
    }
    @media (max-width: 1024px) {
      .adv-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px 16px;
      }
      .stat-item:nth-child(2)::after {
        display: none;
      }
      .scene-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 992px) {
      .main-nav {
        display: none;
      }
      .search-box {
        display: none;
      }
      .nav-console {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .nav-actions {
        gap: 8px;
      }
      .nav-cta {
        padding: 10px 16px;
        font-size: 13px;
      }
    }
    @media (max-width: 768px) {
      .hero {
        padding: 64px 0 56px;
      }
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .hero h1 {
        font-size: 30px;
      }
      .hero-image {
        order: -1;
      }
      .intro-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .section {
        --spacer: 56px;
      }
      .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
      }
      .footer-brand {
        grid-column: 1 / -1;
      }
    }
    @media (max-width: 640px) {
      .adv-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline::before {
        left: 18px;
      }
      .timeline-item {
        gap: 16px;
      }
      .timeline-dot {
        width: 40px;
        height: 40px;
        font-size: 14px;
      }
      .timeline-content {
        padding: 18px;
      }
      .cta-box {
        padding: 32px 24px;
      }
      .cta-form {
        flex-direction: column;
      }
      .cta-form input,
      .cta-form .btn {
        width: 100%;
      }
      .footer-inner {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }
    @media (max-width: 520px) {
      .nav-cta {
        padding: 9px 12px;
        font-size: 13px;
      }
      .nav-cta i {
        display: none;
      }
      .logo-text {
        font-size: 15px;
      }
      .logo-mark {
        width: 34px;
        height: 34px;
        font-size: 15px;
      }
    }

/* roulang page: article */
:root {
  --primary: #2E6BED;
  --primary-dark: #1F54C4;
  --primary-light: #EAF1FE;
  --accent: #FF6B35;
  --teal: #12A5A0;
  --bg: #F7F9FC;
  --card: #FFFFFF;
  --title: #1F2D3D;
  --body: #3D4C5C;
  --muted: #8A94A6;
  --border: #E1E8F0;
  --success: #22C55E;
  --warning: #F59E0B;
  --error: #EF4444;
  --radius: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 2px 8px rgba(30,60,90,0.05);
  --shadow: 0 4px 16px rgba(30,60,90,0.06);
  --shadow-lg: 0 14px 32px rgba(30,60,90,0.12);
  --focus-ring: 0 0 0 3px rgba(46,107,237,0.2);
  --transition: all .25s ease;
  --container-w: 1200px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
button, input { font-family: inherit; }
.container { max-width: var(--container-w); margin: 0 auto; padding: 0 24px; }

/* ========== Header / Nav ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--teal));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 17px;
  box-shadow: 0 4px 12px rgba(46,107,237,0.28);
}
.logo-text { font-size: 18px; font-weight: 700; color: var(--title); white-space: nowrap; }
.logo-text .highlight { color: var(--primary); }

.main-nav { display: flex; align-items: center; gap: 32px; }
.nav-link {
  position: relative;
  text-decoration: none;
  color: var(--body);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 2px;
  transition: var(--transition);
}
.nav-link:hover { color: var(--primary); }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
}

.header-right { display: flex; align-items: center; gap: 14px; }
.search-box { position: relative; }
.search-box input {
  width: 240px;
  height: 40px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: #F1F5F9;
  padding: 0 16px 0 38px;
  font-size: 14px;
  color: var(--title);
  outline: none;
  transition: var(--transition);
}
.search-box input::placeholder { color: var(--muted); }
.search-box input:focus {
  background: #fff;
  border-color: var(--primary);
  box-shadow: var(--focus-ring);
  width: 280px;
}
.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 13px;
  pointer-events: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  padding: 12px 24px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  line-height: 1.4;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(46,107,237,0.25); }
.btn-primary:hover { background: var(--primary-dark); box-shadow: 0 8px 20px rgba(46,107,237,0.3); transform: translateY(-2px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn-outline { background: #fff; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-outline:active { transform: translateY(1px); }
.btn-outline:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn-sm { padding: 8px 18px; font-size: 13px; border-radius: 10px; }

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--title);
  font-size: 16px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}
.menu-toggle:hover { background: var(--primary-light); color: var(--primary); }

.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: #fff;
  padding: 16px 24px 20px;
  box-shadow: var(--shadow-lg);
  border-bottom: 1px solid var(--border);
  z-index: 99;
  flex-direction: column;
  gap: 8px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--title);
  text-decoration: none;
  transition: var(--transition);
}
.mobile-menu a:hover { background: var(--primary-light); color: var(--primary); }
.mobile-menu a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }

/* ========== Article ========== */
.article-section { padding: 56px 0 72px; }
.article-wrap { max-width: 880px; margin: 0 auto; }
.article-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 48px 52px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 28px;
}
.breadcrumb a { color: var(--muted); text-decoration: none; transition: var(--transition); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: #C0C8D4; }
.breadcrumb .now { color: var(--title); font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 360px; }

.article-header h1 {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--title);
  margin-bottom: 20px;
  word-break: break-word;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  padding-bottom: 24px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
}
.meta-item { display: inline-flex; align-items: center; gap: 7px; }
.meta-item i { color: var(--primary); font-size: 13px; }
.badge-category {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 6px;
  text-decoration: none;
  transition: var(--transition);
}
.badge-category:hover { background: var(--primary); color: #fff; }

.article-summary {
  background: linear-gradient(135deg, #F8FAFD 0%, #F0F5FF 100%);
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  padding: 18px 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body);
  margin-bottom: 36px;
}

.article-body { font-size: 16px; line-height: 1.9; color: var(--body); word-break: break-word; }
.article-body h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--title);
  margin: 42px 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  line-height: 1.4;
}
.article-body h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--title);
  margin: 32px 0 12px;
  line-height: 1.45;
}
.article-body p { margin-bottom: 18px; }
.article-body ul, .article-body ol { margin: 0 0 20px; padding-left: 24px; }
.article-body li { margin-bottom: 8px; }
.article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.article-body a:hover { color: var(--primary-dark); }
.article-body img { max-width: 100%; border-radius: var(--radius-md); margin: 24px 0; box-shadow: var(--shadow-sm); }
.article-body blockquote {
  border-left: 4px solid var(--teal);
  background: #F0FAFA;
  padding: 18px 22px;
  border-radius: 0 12px 12px 0;
  margin: 24px 0;
  color: var(--body);
}
.article-body pre {
  background: #1E293B;
  color: #E2E8F0;
  padding: 20px 22px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.7;
  margin: 24px 0;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}
.article-body code {
  background: #F1F5F9;
  color: #D63384;
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 14px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}
.article-body pre code { background: transparent; color: inherit; padding: 0; }
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
  border-radius: 8px;
  overflow: hidden;
}
.article-body th, .article-body td {
  border: 1px solid var(--border);
  padding: 11px 14px;
  text-align: left;
}
.article-body th { background: var(--primary-light); color: var(--title); font-weight: 600; }

.article-footer {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.article-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  display: inline-flex;
  align-items: center;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 6px;
  text-decoration: none;
  transition: var(--transition);
}
.tag:hover { background: var(--primary); color: #fff; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}
.back-link:hover { color: var(--primary-dark); gap: 12px; }

.not-found { text-align: center; padding: 72px 40px; }
.not-found-icon { font-size: 46px; color: var(--muted); margin-bottom: 16px; }
.not-found h1 { font-size: 28px; color: var(--title); margin-bottom: 12px; }
.not-found p { color: var(--muted); margin-bottom: 24px; }

/* ========== Related ========== */
.related-section { padding: 72px 0; background: var(--bg); border-top: 1px solid var(--border); }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}
.section-title { font-size: 28px; font-weight: 700; color: var(--title); }
.section-sub { color: var(--muted); font-size: 14px; margin-top: 6px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.related-card {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(46,107,237,0.3); }
.related-card:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.card-cover { height: 180px; overflow: hidden; position: relative; background: #EAF1FE; }
.card-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.related-card:hover .card-cover img { transform: scale(1.05); }
.card-body { padding: 20px 20px 18px; flex: 1; display: flex; flex-direction: column; }
.card-body .tag { align-self: flex-start; }
.card-body h3 { font-size: 17px; font-weight: 600; color: var(--title); margin: 12px 0 8px; line-height: 1.45; transition: var(--transition); }
.related-card:hover .card-body h3 { color: var(--primary); }
.card-text {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}
.card-meta { margin-top: auto; display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--muted); }
.card-meta i { font-size: 11px; margin-right: 3px; }

/* ========== CTA ========== */
.cta-section { padding: 24px 0 80px; }
.cta-card {
  background: linear-gradient(135deg, #F0F6FF 0%, #FFFFFF 60%);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.cta-card::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46,107,237,0.10) 0%, transparent 70%);
  pointer-events: none;
}
.cta-card h2 { font-size: 27px; font-weight: 700; color: var(--title); margin-bottom: 10px; line-height: 1.4; }
.cta-card > p { color: var(--muted); max-width: 560px; margin: 0 auto 28px; font-size: 15px; line-height: 1.7; }
.cta-form { display: flex; gap: 12px; max-width: 500px; margin: 0 auto 18px; }
.cta-form input {
  flex: 1;
  height: 46px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 0 16px;
  font-size: 14px;
  outline: none;
  transition: var(--transition);
  background: #fff;
}
.cta-form input::placeholder { color: var(--muted); }
.cta-form input:focus { border-color: var(--primary); box-shadow: var(--focus-ring); }
.cta-note { margin-top: 14px; }

/* ========== Footer ========== */
.site-footer { background: #fff; border-top: 1px solid var(--border); padding: 64px 0 32px; }
.footer-inner { display: grid; grid-template-columns: 2.4fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand .logo-text { font-size: 18px; font-weight: 700; color: var(--title); }
.footer-brand .logo-text .highlight { color: var(--primary); }
.footer-brand p { font-size: 14px; color: var(--muted); margin-top: 14px; max-width: 340px; line-height: 1.7; }
.footer-col h4 { font-size: 15px; font-weight: 600; color: var(--title); margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--body); text-decoration: none; font-size: 14px; transition: var(--transition); }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom .links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-bottom .links a { color: var(--muted); text-decoration: none; font-size: 13px; transition: var(--transition); }
.footer-bottom .links a:hover { color: var(--primary); }

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .search-box input { width: 180px; }
  .search-box input:focus { width: 220px; }
  .main-nav { gap: 20px; }
  .article-card { padding: 40px 36px; }
}

@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .main-nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .header-right .search-box { display: none; }
  .header-right { gap: 10px; }
  .btn-header { padding: 8px 14px; font-size: 13px; }
  .article-section { padding: 32px 0 48px; }
  .article-card { padding: 24px 20px; border-radius: 14px; }
  .article-header h1 { font-size: 26px; }
  .meta-line { gap: 10px 16px; }
  .article-summary { padding: 14px 16px; }
  .article-body h2 { font-size: 22px; }
  .related-section { padding: 56px 0; }
  .cta-card { padding: 36px 20px; }
  .cta-form { flex-direction: column; }
  .cta-form .btn { width: 100%; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .section-head { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 520px) {
  .related-grid { grid-template-columns: 1fr; }
  .article-body { font-size: 15px; }
  .article-body h2 { font-size: 20px; }
  .breadcrumb .now { max-width: 220px; }
  .cta-card h2 { font-size: 22px; }
  .cta-card > p { font-size: 14px; }
  .card-cover { height: 200px; }
  .footer-bottom { gap: 8px; }
  .btn-header { display: none; }
}