/* roulang page: index */
:root {
  --primary: #1B5F9C;
  --primary-dark: #154F82;
  --accent: #F25C3A;
  --accent-light: #FEF3EF;
  --bg: #F5F8FB;
  --white: #FFFFFF;
  --text: #1A2B3D;
  --text-secondary: #526A82;
  --text-tertiary: #8A9BAE;
  --border: #E4EBF2;
  --primary-light: #EAF1F8;
  --primary-lighter: #DCE8F3;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 999px;
  --shadow-xs: 0 2px 12px rgba(27, 95, 156, 0.06);
  --shadow-sm: 0 4px 20px rgba(27, 95, 156, 0.08);
  --shadow-md: 0 12px 36px rgba(27, 95, 156, 0.14);
  --transition: 0.25s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.row { max-width: 1200px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 28px;
  border-radius: var(--radius-lg);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: all var(--transition);
  line-height: 44px;
  text-align: center;
  white-space: nowrap;
}
.btn i { margin-right: 8px; font-size: 14px; }
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; box-shadow: 0 8px 20px rgba(27, 95, 156, 0.2); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(1px); }
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover { background: var(--primary-light); border-color: var(--primary-dark); color: var(--primary-dark); }
.btn-light {
  background: #fff;
  color: var(--primary);
}
.btn-light:hover { background: var(--primary-light); color: var(--primary-dark); box-shadow: 0 8px 24px rgba(0,0,0,0.12); }
.btn-outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.7);
}
.btn-outline-light:hover { background: rgba(255,255,255,0.12); color: #fff; border-color: #fff; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.section { padding: 72px 0; }
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 5px 16px;
  border-radius: var(--radius-lg);
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.section-header { text-align: center; margin-bottom: 48px; }
.section-header .section-title { font-size: 1.75rem; font-weight: 700; color: var(--text); line-height: 1.4; }
.section-header .section-desc { font-size: 0.95rem; color: var(--text-secondary); margin-top: 8px; }

/* ===== Header Nav ===== */
.site-header {
  position: fixed;
  top: 12px;
  left: 0;
  right: 0;
  z-index: 999;
  transition: all .3s;
}
.site-header.scrolled .nav-capsule {
  background: rgba(255,255,255,0.92);
  box-shadow: var(--shadow-md);
}
.nav-capsule {
  max-width: 1200px;
  height: 64px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  transition: all .3s;
}
.nav-logo { display: flex; align-items: baseline; gap: 4px; flex-shrink: 0; }
.logo-main { font-size: 22px; font-weight: 800; color: var(--primary); letter-spacing: 0.5px; }
.logo-sub { font-size: 13px; font-weight: 500; color: var(--text-secondary); letter-spacing: 0.5px; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-link {
  padding: 8px 20px;
  border-radius: var(--radius-lg);
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  transition: all var(--transition);
}
.nav-link:hover { background: var(--primary-light); color: var(--primary); }
.nav-link.active { background: var(--primary); color: #fff; }
.nav-cta { margin-left: 12px; height: 40px; padding: 0 22px; line-height: 40px; font-size: 14px; }
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 12px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span { width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: all .3s; }
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  display: none;
  position: fixed;
  top: 88px;
  left: 24px;
  right: 24px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 12px;
  z-index: 998;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity .2s, transform .2s;
}
.mobile-menu.open { opacity: 1; transform: translateY(0); }
.mobile-menu a {
  display: block;
  padding: 14px 20px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  border-radius: 8px;
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { background: var(--primary-light); color: var(--primary); }
.mobile-menu a.active { color: var(--primary); font-weight: 600; }
.mobile-menu .btn { margin: 12px 20px 8px; display: flex; }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  background: linear-gradient(90deg, #F5F8FB 0%, #FFFFFF 80%);
  overflow: hidden;
  padding: 120px 0 96px;
}
.hero-content { padding-right: 30px; }
.hero-badge-line { margin-bottom: 20px; }
.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 18px;
  border-radius: var(--radius-lg);
}
.hero-badge-pill i { font-size: 12px; }
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.hero-title .highlight { color: var(--primary); }
.hero-subtitle {
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 480px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual { position: relative; }
.hero-image-wrap {
  aspect-ratio: 4/3;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(27, 95, 156, 0.18);
  position: relative;
  background: var(--primary-light);
}
.hero-image-wrap img { width: 100%; height: 100%; object-fit: cover; }
.hero-image-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.08), transparent 40%);
}
.hero-corner-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-lg);
  z-index: 2;
  box-shadow: 0 4px 16px rgba(242, 92, 58, 0.3);
}
.scroll-indicator {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 18px;
  animation: floatDown 2s ease-in-out infinite;
  background: #fff;
}
@keyframes floatDown {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 4px); }
}

/* ===== News Section ===== */
.news-section { background: var(--bg); position: relative; }
.news-header-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
}
.news-header-flex .section-title { margin-bottom: 0; }
.more-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
  min-height: 36px;
  min-width: 36px;
  padding: 0 12px;
  border-radius: var(--radius-lg);
  transition: all .2s;
}
.more-link:hover { color: var(--accent); }
.more-link i { transition: transform .2s; }
.more-link:hover i { transform: translateX(4px); }
.news-grid { display: flex; flex-wrap: wrap; margin: 0 -12px; }
.news-grid .column { padding: 0 12px; margin-bottom: 24px; }
.news-card-link { display: block; height: 100%; color: var(--text); }
.news-card-link:hover .news-card { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.news-card {
  display: flex;
  flex-direction: column;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  height: 100%;
  transition: all var(--transition);
}
.news-card-img { aspect-ratio: 16/10; overflow: hidden; background: var(--primary-light); }
.news-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.news-card-link:hover .news-card-img img { transform: scale(1.05); }
.news-card-body { padding: 20px; display: flex; flex-direction: column; flex: 1; }
.news-card-tag {
  align-self: flex-start;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
}
.news-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--text);
  min-height: 50px;
}
.news-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
  flex: 1;
}
.news-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  border-top: 1px solid var(--border);
  padding-top: 14px;
  margin-top: auto;
}
.news-card-meta i { font-size: 12px; margin-right: 4px; }
.empty-state {
  text-align: center;
  padding: 64px 20px;
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px dashed var(--border);
}
.empty-state .empty-icon {
  width: 64px;
  height: 64px;
  border: 1px solid var(--border);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}
.empty-state p { color: var(--text-tertiary); font-size: 15px; }

/* ===== Feature Section ===== */
.feature-section { background: #fff; }
.feature-grid { display: flex; flex-wrap: wrap; margin: 0 -12px; }
.feature-grid .column { padding: 0 12px; margin-bottom: 24px; }
.feature-item {
  background: var(--bg);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  height: 100%;
  border: 1px solid transparent;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-item:hover { border-color: var(--primary-lighter); background: #fff; box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.feature-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: 20px;
  margin-bottom: 18px;
  transition: all .3s;
}
.feature-item:hover .feature-icon { background: var(--primary); color: #fff; }
.feature-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; color: var(--text); }
.feature-text { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.65; }

/* ===== Featured Grid ===== */
.grid-section { background: var(--bg); }
.grid-list { display: flex; flex-wrap: wrap; margin: 0 -12px; }
.grid-list .column { padding: 0 12px; margin-bottom: 24px; }
.grid-card {
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.grid-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.grid-card-img { aspect-ratio: 1/1; overflow: hidden; }
.grid-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.grid-card:hover .grid-card-img img { transform: scale(1.05); }
.grid-card-body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; }
.grid-card-title { font-size: 1.05rem; font-weight: 600; margin-bottom: 4px; color: var(--text); }
.grid-card-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 12px; flex: 1; }
.grid-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
}
.grid-card-link:hover { color: var(--accent); }
.grid-card-link i { transition: transform .2s; font-size: 12px; }
.grid-card-link:hover i { transform: translateX(3px); }

/* ===== Testimonials ===== */
.testimonial-section {
  background: linear-gradient(135deg, #F5F8FB 0%, #fff 70%);
  position: relative;
}
.testimonial-carousel { max-width: 860px; margin: 0 auto; position: relative; }
.testimonial-track { overflow: hidden; padding: 20px 0; }
.testimonial-slide { display: none; }
.testimonial-slide.active { display: block !important; }
.testimonial-card {
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 48px 40px;
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
  position: relative;
  border: 1px solid transparent;
}
.testimonial-card::before {
  content: '"';
  font-family: Georgia, serif;
  font-size: 72px;
  color: var(--primary);
  opacity: 0.25;
  position: absolute;
  top: 16px;
  left: 28px;
  line-height: 1;
}
.testimonial-quote { font-size: 1.05rem; color: var(--text); line-height: 1.8; margin-bottom: 24px; max-width: 560px; margin-left: auto; margin-right: auto; min-height: 96px; }
.testimonial-author { display: flex; align-items: center; justify-content: center; gap: 14px; }
.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 600;
}
.testimonial-name { font-size: 14px; font-weight: 600; color: var(--text); }
.testimonial-meta { font-size: 0.85rem; color: var(--text-tertiary); }
.carousel-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 24px;
}
.carousel-arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--primary);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .2s;
}
.carousel-arrow:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.carousel-dots { display: flex; gap: 8px; }
.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #C5D3E0;
  border: none;
  padding: 0;
  transition: all .2s;
}
.carousel-dot.active { background: var(--primary); width: 28px; border-radius: 999px; }

/* ===== Guarantee ===== */
.guarantee-section { background: #fff; padding: 48px 0; }
.guarantee-list {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg);
  padding: 32px 20px;
}
.guarantee-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 24px;
  position: relative;
}
.guarantee-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: var(--border);
}
.guarantee-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  flex-shrink: 0;
}
.guarantee-text { font-size: 15px; font-weight: 500; color: var(--text); white-space: nowrap; }

/* ===== FAQ ===== */
.faq-section { background: var(--bg); }
.faq-wrap { max-width: 800px; margin: 0 auto; }
.faq-accordion.accordion { list-style: none; background: transparent; }
.faq-accordion .accordion-item {
  background: #fff;
  border-radius: var(--radius-md);
  margin-bottom: 8px;
  box-shadow: var(--shadow-xs);
  border: 1px solid transparent;
  transition: all .2s;
  overflow: hidden;
}
.faq-accordion .accordion-item:hover { border-color: var(--primary-lighter); }
.faq-accordion .accordion-item.is-active { border-color: var(--primary-lighter); box-shadow: var(--shadow-sm); }
.faq-accordion .accordion-title {
  background: transparent;
  border-bottom: none;
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  position: relative;
  transition: all .2s;
}
.faq-accordion .accordion-title:hover { background: var(--bg); color: var(--primary); }
.faq-accordion .accordion-title::before {
  content: '+';
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--primary);
  transition: transform .25s;
}
.faq-accordion .accordion-item.is-active .accordion-title::before { transform: translateY(-50%) rotate(45deg); }
.faq-accordion .accordion-title::after { display: none; }
.faq-accordion .accordion-title:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; border-radius: var(--radius-md); }
.faq-accordion .accordion-content {
  background: #fff;
  border-top: 1px solid var(--border);
  padding: 18px 24px 22px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
}
.faq-accordion .accordion-content[data-tab-content] { background: #fff; }

/* ===== CTA ===== */
.cta-banner {
  background: var(--primary);
  padding: 72px 0;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
}
.cta-banner::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: 10%;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
}
.cta-inner { text-align: center; position: relative; z-index: 2; }
.cta-title {
  color: #fff;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 28px;
  line-height: 1.4;
}
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Footer ===== */
.site-footer {
  background: #1A2B3D;
  padding: 48px 0 24px;
  color: #B0C1D0;
}
.footer-grid { display: flex; flex-wrap: wrap; margin: 0 -12px; }
.footer-grid .column { padding: 0 12px; margin-bottom: 32px; }
.footer-logo { margin-bottom: 16px; display: flex; align-items: baseline; gap: 4px; }
.footer-logo .logo-main { color: #fff; font-size: 22px; font-weight: 800; }
.footer-logo .logo-sub { color: #8A9BAE; font-size: 13px; }
.footer-desc { font-size: 0.85rem; color: #8A9BAE; line-height: 1.7; max-width: 260px; }
.footer-icp { font-size: 0.8rem; color: #6A8198; margin-top: 12px; }
.footer-title {
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: #8A9BAE;
  font-size: 14px;
  transition: all .2s;
}
.footer-links a:hover { color: #fff; padding-left: 4px; }
.footer-contact { font-size: 0.85rem; color: #8A9BAE; line-height: 1.7; }
.footer-btm {
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 24px;
  padding-top: 20px;
  text-align: center;
}
.footer-btm p { font-size: 12px; color: #6A8198; line-height: 1.5; }

/* ===== Responsive ===== */
@media screen and (max-width: 1024px) {
  .section { padding: 56px 0; }
  .nav-links { gap: 2px; }
  .nav-link { padding: 8px 14px; font-size: 14px; }
  .nav-cta { display: none; }
  .hero { padding: 100px 0 80px; }
  .hero-title { font-size: clamp(2rem, 4.5vw, 3rem); }
}
@media screen and (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }
  .mobile-menu.open { display: block; }
  .hero { min-height: auto; padding: 100px 0 64px; }
  .hero-content { padding-right: 0; text-align: center; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual { margin-top: 40px; }
  .scroll-indicator { display: none; }
  .guarantee-list { flex-direction: column; gap: 16px; }
  .guarantee-item:not(:last-child)::after { display: none; }
  .testimonial-card { padding: 36px 24px; }
}
@media screen and (max-width: 640px) {
  .section { padding: 48px 0; }
  .nav-capsule { border-radius: 16px; height: 58px; padding: 0 14px; }
  .logo-main { font-size: 19px; }
  .logo-sub { font-size: 11px; }
  .secondary-nav-hide { display: none; }
  .news-header-flex { flex-direction: row; }
  .more-link { font-size: 14px; }
  .feature-item { padding: 24px 20px; }
  .testimonial-card { padding: 28px 18px; }
  .testimonial-quote { font-size: 0.95rem; min-height: auto; }
  .carousel-controls { gap: 14px; }
  .cta-banner { padding: 56px 0; }
  .cta-title { font-size: 1.4rem; }
  .footer-grid .column { margin-bottom: 24px; }
  .btn { height: 42px; padding: 0 22px; font-size: 14px; line-height: 42px; }
}

/* roulang page: category1 */
/* ========== 1. 设计变量 ========== */
    :root {
      --primary: #1B5F9C;
      --primary-dark: #154F82;
      --primary-light: #EAF1F8;
      --primary-lighter: #DCE8F3;
      --primary-soft: #F0F5FA;
      --accent: #F25C3A;
      --accent-light: #FEF3EF;
      --bg: #F5F8FB;
      --white: #FFFFFF;
      --text: #1A2B3D;
      --text-secondary: #526A82;
      --text-muted: #8A9BAE;
      --border: #E4EBF2;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-full: 999px;
      --shadow-xs: 0 2px 12px rgba(27, 95, 156, 0.06);
      --shadow-sm: 0 4px 20px rgba(27, 95, 156, 0.08);
      --shadow-md: 0 12px 36px rgba(27, 95, 156, 0.14);
      --transition: 0.25s ease;
      --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }

    /* ========== 2. Reset/Base ========== */
    *, *::before, *::after {
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
    }
    body {
      margin: 0;
      padding: 0;
      font-family: var(--font-family);
      font-size: 16px;
      line-height: 1.8;
      color: var(--text);
      background: var(--bg);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: color var(--transition);
    }
    a:hover {
      color: var(--accent);
    }
    ul, ol {
      margin: 0;
      padding: 0;
      list-style: none;
    }
    h1, h2, h3, h4, h5, h6 {
      margin: 0;
      padding: 0;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text);
    }
    p {
      margin: 0;
      padding: 0;
    }
    button {
      font-family: var(--font-family);
      cursor: pointer;
      border: none;
      background: none;
    }
    input, textarea {
      font-family: var(--font-family);
    }
    :focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    /* ========== 3. 布局容器 ========== */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .section {
      padding: 72px 0;
    }
    .section-light {
      background: var(--white);
    }
    .section-bg {
      background: var(--bg);
    }

    /* ========== 4. 导航 ========== */
    .site-header {
      position: fixed;
      top: 12px;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 0 16px;
      pointer-events: none;
    }
    .site-header .container {
      pointer-events: auto;
    }
    .nav-capsule {
      max-width: 1200px;
      margin: 0 auto;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: rgba(255, 255, 255, 0.82);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-full);
      box-shadow: 0 4px 24px rgba(27, 95, 156, 0.1);
      padding: 0 20px 0 24px;
      border: 1px solid rgba(228, 235, 242, 0.6);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .site-header.scrolled .nav-capsule {
      background: rgba(255, 255, 255, 0.94);
      box-shadow: 0 8px 32px rgba(27, 95, 156, 0.14);
    }
    .nav-logo {
      display: flex;
      align-items: baseline;
      gap: 2px;
      flex-shrink: 0;
      text-decoration: none;
    }
    .nav-logo .logo-main {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .nav-logo .logo-sub {
      font-size: 0.8rem;
      font-weight: 500;
      color: var(--text-secondary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-left: 16px;
    }
    .nav-link {
      display: inline-block;
      padding: 8px 20px;
      border-radius: var(--radius-full);
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text);
      transition: all 0.2s ease;
      white-space: nowrap;
    }
    .nav-link:hover {
      color: var(--primary);
      background: var(--primary-light);
    }
    .nav-link.active {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 4px 14px rgba(27, 95, 156, 0.25);
    }
    .nav-link.active:hover {
      background: var(--primary-dark);
      color: #fff;
    }
    .nav-cta {
      margin-left: auto;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      flex-shrink: 0;
    }
    .nav-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .nav-toggle span {
      display: block;
      width: 18px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: all 0.3s ease;
    }
    .nav-toggle.active span:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }
    .nav-toggle.active span:nth-child(2) {
      opacity: 0;
    }
    .nav-toggle.active span:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    /* ========== 5. 按钮 ========== */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      height: 44px;
      padding: 0 28px;
      border-radius: var(--radius-full);
      font-size: 0.95rem;
      font-weight: 600;
      line-height: 1;
      text-decoration: none;
      transition: all 0.25s ease;
      border: 2px solid transparent;
      cursor: pointer;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
      box-shadow: 0 4px 16px rgba(27, 95, 156, 0.18);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      color: #fff;
      box-shadow: 0 8px 24px rgba(27, 95, 156, 0.24);
      transform: translateY(-2px);
    }
    .btn-primary:active {
      transform: translateY(1px);
      box-shadow: 0 2px 8px rgba(27, 95, 156, 0.18);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary-light);
      color: var(--primary-dark);
      border-color: var(--primary-dark);
      transform: translateY(-2px);
    }
    .btn-outline:active {
      transform: translateY(1px);
    }
    .btn-white {
      background: #fff;
      color: var(--primary);
      border-color: #fff;
      box-shadow: 0 4px 16px rgba(255, 255, 255, 0.2);
    }
    .btn-white:hover {
      background: rgba(255, 255, 255, 0.9);
      color: var(--primary-dark);
      transform: translateY(-2px);
    }
    .btn-outline-white {
      background: transparent;
      color: #fff;
      border-color: rgba(255, 255, 255, 0.7);
    }
    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.1);
      color: #fff;
      border-color: #fff;
      transform: translateY(-2px);
    }
    .btn-sm {
      height: 36px;
      padding: 0 20px;
      font-size: 0.875rem;
    }
    .btn i {
      font-size: 0.85em;
    }

    /* ========== 6. 面包屑 ========== */
    .breadcrumb {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 6px;
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .breadcrumb a {
      color: var(--text-secondary);
      text-decoration: none;
      transition: color 0.2s;
    }
    .breadcrumb a:hover {
      color: var(--primary);
    }
    .breadcrumb .sep {
      color: var(--border);
    }
    .breadcrumb .current {
      color: var(--primary);
      font-weight: 500;
    }

    /* ========== 7. 分类页 Hero ========== */
    .cat-hero {
      position: relative;
      padding: 160px 0 88px;
      background: linear-gradient(90deg, #F5F8FB 0%, #FFFFFF 80%);
      overflow: hidden;
      border-bottom: 1px solid var(--border);
    }
    .cat-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.png');
      background-size: cover;
      background-position: center;
      opacity: 0.08;
      z-index: 0;
    }
    .cat-hero .container {
      position: relative;
      z-index: 1;
    }
    .cat-hero-inner {
      max-width: 720px;
    }
    .cat-hero h1 {
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 700;
      line-height: 1.2;
      color: var(--text);
      margin-bottom: 16px;
    }
    .cat-hero h1 .highlight {
      color: var(--primary);
    }
    .cat-hero .hero-desc {
      font-size: 1.1rem;
      line-height: 1.7;
      color: var(--text-secondary);
      max-width: 560px;
      margin-bottom: 28px;
    }
    .cat-hero .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: var(--accent-light);
      color: var(--accent);
      font-size: 0.8rem;
      font-weight: 600;
      padding: 5px 14px;
      border-radius: var(--radius-full);
      margin-bottom: 20px;
    }

    /* ========== 8. 卡片网格 ========== */
    .cat-cards {
      padding: 72px 0;
      background: var(--bg);
    }
    .section-head {
      margin-bottom: 48px;
    }
    .section-head .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 14px;
      border-radius: var(--radius-full);
      margin-bottom: 12px;
    }
    .section-head h2 {
      font-size: clamp(1.6rem, 3vw, 2.2rem);
      line-height: 1.3;
      margin-bottom: 10px;
    }
    .section-head .section-sub {
      font-size: 0.95rem;
      color: var(--text-muted);
      max-width: 520px;
    }
    .info-card {
      background: var(--white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: all 0.3s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .info-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .info-card .card-media {
      position: relative;
      aspect-ratio: 16 / 10;
      overflow: hidden;
    }
    .info-card .card-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .info-card:hover .card-media img {
      transform: scale(1.05);
    }
    .info-card .card-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(6px);
      color: var(--primary);
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: var(--radius-full);
      z-index: 2;
    }
    .info-card .card-body {
      padding: 20px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }
    .info-card .card-body h3 {
      font-size: 1.15rem;
      font-weight: 600;
      line-height: 1.5;
      margin-bottom: 10px;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
      min-height: calc(1.15rem * 1.5 * 2);
    }
    .info-card .card-body p {
      font-size: 0.875rem;
      color: var(--text-secondary);
      line-height: 1.7;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
      margin-bottom: 14px;
      flex: 1;
    }
    .info-card .card-meta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-top: 12px;
      border-top: 1px solid var(--border);
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .info-card .card-link {
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 0.85rem;
    }
    .info-card .card-link i {
      transition: transform 0.2s ease;
      font-size: 0.8em;
    }
    .info-card .card-link:hover {
      color: var(--accent);
    }
    .info-card .card-link:hover i {
      transform: translateX(4px);
    }

    /* ========== 9. 特色区 ========== */
    .cat-features {
      padding: 72px 0;
      background: var(--white);
    }
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-item {
      background: var(--bg);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      border: 1px solid var(--border);
      transition: all 0.3s ease;
    }
    .feature-item:hover {
      background: var(--white);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: transparent;
    }
    .feature-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: 1.2rem;
      margin-bottom: 16px;
    }
    .feature-item h3 {
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .feature-item p {
      font-size: 0.875rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* ========== 10. 场景区 ========== */
    .cat-scenes {
      padding: 72px 0;
      background: var(--bg);
    }
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .scene-item {
      background: var(--white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      padding: 30px 24px;
      text-align: center;
      transition: all 0.3s ease;
    }
    .scene-item:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .scene-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-light);
      line-height: 1;
      margin-bottom: 12px;
      letter-spacing: -1px;
    }
    .scene-item h3 {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .scene-item p {
      font-size: 0.875rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }
    .scene-item .scene-dot {
      display: block;
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--accent);
      margin: 0 auto 14px;
    }

    /* ========== 11. FAQ 手风琴 ========== */
    .cat-faq {
      padding: 72px 0;
      background: var(--white);
    }
    .faq-list {
      max-width: 820px;
      margin: 0 auto;
    }
    .accordion-item-custom {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-xs);
      margin-bottom: 12px;
      overflow: hidden;
      transition: box-shadow 0.3s ease;
    }
    .accordion-item-custom:hover {
      box-shadow: var(--shadow-sm);
    }
    .accordion-item-custom .acc-title {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text);
      cursor: pointer;
      background: none;
      border: none;
      text-align: left;
      width: 100%;
      transition: background 0.2s ease;
    }
    .accordion-item-custom .acc-title:hover {
      background: var(--primary-soft);
    }
    .accordion-item-custom .acc-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 1rem;
      font-weight: 600;
      flex-shrink: 0;
      transition: all 0.3s ease;
    }
    .accordion-item-custom .acc-title[aria-expanded="true"] .acc-icon {
      background: var(--primary);
      color: #fff;
      transform: rotate(45deg);
    }
    .accordion-item-custom .acc-content {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
    }
    .accordion-item-custom .acc-content-inner {
      padding-bottom: 20px;
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.8;
      border-top: 1px solid var(--border);
      padding-top: 16px;
    }
    .accordion-item-custom.active {
      box-shadow: var(--shadow-sm);
    }
    .accordion-item-custom.active .acc-content {
      max-height: 600px;
      padding-bottom: 20px;
    }

    /* ========== 12. CTA 通栏 ========== */
    .cta-banner {
      background: var(--primary);
      padding: 64px 0;
      position: relative;
      overflow: hidden;
    }
    .cta-banner::before {
      content: "";
      position: absolute;
      top: -50%;
      right: -20%;
      width: 400px;
      height: 400px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.06);
      pointer-events: none;
    }
    .cta-banner::after {
      content: "";
      position: absolute;
      bottom: -60%;
      left: -10%;
      width: 300px;
      height: 300px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.04);
      pointer-events: none;
    }
    .cta-banner .container {
      position: relative;
      z-index: 1;
      text-align: center;
    }
    .cta-banner h2 {
      color: #fff;
      font-size: clamp(1.4rem, 2.5vw, 2rem);
      font-weight: 700;
      margin-bottom: 8px;
    }
    .cta-banner p {
      color: rgba(255, 255, 255, 0.8);
      font-size: 0.95rem;
      margin-bottom: 28px;
    }
    .cta-actions {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 14px;
    }

    /* ========== 13. Footer ========== */
    .site-footer {
      background: #1A2B3D;
      padding: 64px 0 0;
      color: #B0C1D0;
    }
    .footer-grid {
      padding-bottom: 48px;
    }
    .footer-logo {
      display: flex;
      align-items: baseline;
      gap: 4px;
      margin-bottom: 16px;
    }
    .footer-logo .logo-main {
      font-size: 1.5rem;
      font-weight: 800;
      color: #fff;
    }
    .footer-logo .logo-sub {
      font-size: 0.8rem;
      color: rgba(255, 255, 255, 0.7);
    }
    .footer-desc {
      font-size: 0.875rem;
      line-height: 1.7;
      color: #B0C1D0;
      max-width: 280px;
      margin-bottom: 16px;
    }
    .footer-icp {
      font-size: 0.8rem;
      color: rgba(255, 255, 255, 0.4);
    }
    .footer-title {
      color: #fff;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 18px;
      position: relative;
      padding-bottom: 8px;
    }
    .footer-title::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 28px;
      height: 2px;
      background: var(--accent);
      border-radius: 2px;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #B0C1D0;
      font-size: 0.9rem;
      text-decoration: none;
      transition: color 0.2s ease, padding-left 0.2s ease;
    }
    .footer-links a:hover {
      color: #fff;
      padding-left: 4px;
    }
    .footer-contact {
      font-size: 0.9rem;
      line-height: 1.7;
      color: #B0C1D0;
    }
    .footer-btm {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 20px 0;
      text-align: center;
    }
    .footer-btm p {
      font-size: 0.8rem;
      color: rgba(255, 255, 255, 0.4);
    }

    /* ========== 14. 响应式 ========== */
    @media (max-width: 1024px) {
      .feature-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scene-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .nav-links {
        gap: 2px;
      }
      .nav-link {
        padding: 8px 14px;
        font-size: 0.9rem;
      }
      .nav-cta .btn-text {
        display: none;
      }
      .nav-cta {
        width: 44px;
        padding: 0;
        justify-content: center;
        border-radius: 50%;
      }
    }
    @media (max-width: 768px) {
      .section {
        padding: 48px 0;
      }
      .cat-hero {
        padding: 132px 0 56px;
      }
      .cat-cards, .cat-features, .cat-scenes, .cat-faq {
        padding: 48px 0;
      }
      .container {
        padding: 0 16px;
      }
      .nav-capsule {
        height: 60px;
        border-radius: 16px;
        padding: 0 14px 0 16px;
      }
      .nav-links {
        position: fixed;
        top: 84px;
        left: 16px;
        right: 16px;
        background: #fff;
        border-radius: 12px;
        box-shadow: var(--shadow-md);
        padding: 12px;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        display: none;
        z-index: 999;
        border: 1px solid var(--border);
      }
      .nav-links.open {
        display: flex;
        animation: fadeIn 0.2s ease;
      }
      @keyframes fadeIn {
        from { opacity: 0; transform: translateY(-8px); }
        to { opacity: 1; transform: translateY(0); }
      }
      .nav-link {
        padding: 14px 20px;
        font-size: 1rem;
        border-radius: 8px;
      }
      .nav-link.active {
        background: var(--primary-light);
        color: var(--primary);
        box-shadow: none;
      }
      .nav-toggle {
        display: flex;
      }
      .nav-cta {
        display: none;
      }
      .cat-hero-inner {
        max-width: 100%;
      }
      .cat-hero h1 {
        font-size: 2rem;
      }
      .cat-hero .hero-desc {
        font-size: 1rem;
      }
      .hero-actions .btn {
        width: 100%;
      }
      .feature-grid, .scene-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        row-gap: 32px;
      }
    }
    @media (max-width: 520px) {
      .cat-hero h1 {
        font-size: 1.75rem;
      }
      .hero-badge {
        font-size: 0.75rem;
      }
      .section-head {
        margin-bottom: 32px;
      }
      .acc-title {
        padding: 16px;
      }
      .acc-content {
        padding: 0 16px;
      }
      .cta-banner {
        padding: 48px 0;
      }
      .cta-actions .btn {
        width: 100%;
      }
    }

/* roulang page: article */
:root {
    --primary: #1B5F9C;
    --primary-dark: #154F82;
    --primary-light: #EAF1F8;
    --primary-lighter: #DCE8F3;
    --accent: #F25C3A;
    --accent-light: #FEF3EF;
    --bg: #F5F8FB;
    --white: #FFFFFF;
    --text: #1A2B3D;
    --text-secondary: #526A82;
    --text-tertiary: #8A9BAE;
    --border: #E4EBF2;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 999px;
    --shadow-xs: 0 2px 12px rgba(27, 95, 156, 0.06);
    --shadow-sm: 0 4px 20px rgba(27, 95, 156, 0.08);
    --shadow-md: 0 12px 36px rgba(27, 95, 156, 0.14);
    --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --container-w: 1200px;
  }

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

  html {
    scroll-behavior: smooth;
  }

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

  a {
    color: var(--primary);
    text-decoration: none;
    transition: color .2s ease;
  }
  a:hover {
    color: var(--accent);
  }

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

  button, input, select, textarea {
    font-family: var(--font-family);
    font-size: inherit;
  }

  .container {
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 20px;
  }

  .row {
    max-width: none;
  }

  /* ===== 按钮 ===== */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 44px;
    padding: 0 28px;
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all .25s ease;
    white-space: nowrap;
    line-height: 1;
  }
  .btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
  .btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(27, 95, 156, 0.2);
  }
  .btn-primary:hover {
    background: var(--primary-dark);
    color: var(--white);
    box-shadow: 0 8px 20px rgba(27, 95, 156, 0.25);
    transform: translateY(-1px);
  }
  .btn-primary:active {
    transform: translateY(1px);
  }
  .btn-outline {
    background: transparent;
    border-color: var(--primary);
    color: var(--primary);
  }
  .btn-outline:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-1px);
  }
  .btn-outline:active {
    transform: translateY(1px);
  }
  .btn-back {
    height: 36px;
    padding: 0 20px;
    font-size: 0.875rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text-secondary);
  }
  .btn-back:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
    transform: translateX(-2px);
  }
  .btn-back i {
    font-size: 0.8125rem;
  }

  /* ===== 导航 ===== */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 12px 16px 0;
    background: transparent;
    transition: background .3s ease;
  }
  .site-header.scrolled {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-xs);
    padding-bottom: 8px;
  }
  .nav-capsule {
    max-width: 1248px;
    height: 64px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 24px rgba(27, 95, 156, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    transition: box-shadow .3s ease;
    position: relative;
  }
  .site-header.scrolled .nav-capsule {
    box-shadow: var(--shadow-sm);
  }
  .nav-logo {
    display: flex;
    align-items: baseline;
    gap: 2px;
    flex-shrink: 0;
  }
  .nav-logo .logo-main {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
  }
  .nav-logo .logo-sub {
    font-size: 0.8125rem;
    font-weight: 400;
    color: var(--text-secondary);
  }
  .nav-links {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .nav-link {
    display: inline-flex;
    align-items: center;
    height: 40px;
    padding: 0 18px;
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
    transition: all .25s ease;
  }
  .nav-link:hover {
    background: var(--primary-light);
    color: var(--primary);
  }
  .nav-link.active {
    background: var(--primary);
    color: var(--white);
    font-weight: 600;
  }
  .nav-link.active:hover {
    background: var(--primary-dark);
    color: var(--white);
  }
  .nav-cta {
    height: 40px;
    padding: 0 20px;
    font-size: 0.875rem;
  }
  .nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
  }
  .nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all .3s ease;
  }
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  /* ===== 文章页标题区 ===== */
  .article-header {
    background: linear-gradient(180deg, #F5F8FB 0%, #FFFFFF 100%);
    padding: 140px 0 48px;
    border-bottom: 1px solid var(--border);
    margin-top: 0;
  }
  .breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: 24px;
  }
  .breadcrumb a {
    color: var(--text-secondary);
    transition: color .2s;
  }
  .breadcrumb a:hover {
    color: var(--primary);
  }
  .breadcrumb .sep {
    color: #C5D3E0;
  }
  .breadcrumb .current {
    color: var(--text-tertiary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 300px;
  }
  .article-header h1 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
  }
  .article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.875rem;
    color: var(--text-tertiary);
  }
  .meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }
  .meta-item i {
    color: var(--primary);
    font-size: 0.8125rem;
  }
  .meta-views {
    position: relative;
  }
  .meta-views::before {
    content: '';
    width: 1px;
    height: 12px;
    background: var(--border);
    margin-right: 14px;
    display: inline-block;
    vertical-align: middle;
  }

  /* ===== 文章主体 ===== */
  .article-body-wrap {
    padding: 56px 0;
    background: var(--bg);
  }
  .article-body-wrap .row {
    align-items: flex-start;
  }
  .article-body-wrap .large-8 {
    padding-right: 32px;
  }

  /* 正文 */
  .article-card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 40px 44px;
  }
  .article-body {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text);
  }
  .article-body > * + * {
    margin-top: 20px;
  }
  .article-body h2 {
    font-size: 1.625rem;
    font-weight: 700;
    line-height: 1.4;
    margin-top: 36px;
    margin-bottom: 16px;
    color: var(--text);
    position: relative;
    padding-left: 16px;
  }
  .article-body h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 4px;
    height: 24px;
    background: var(--primary);
    border-radius: 2px;
  }
  .article-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    margin-top: 28px;
    margin-bottom: 12px;
    color: var(--text);
  }
  .article-body p {
    margin-bottom: 20px;
    color: #33475B;
    font-size: 1rem;
  }
  .article-body strong {
    color: var(--text);
    font-weight: 600;
  }
  .article-body ul,
  .article-body ol {
    margin: 16px 0 24px;
    padding-left: 28px;
  }
  .article-body ul li,
  .article-body ol li {
    margin-bottom: 8px;
    line-height: 1.75;
    color: #33475B;
  }
  .article-body ul li::marker {
    color: var(--primary);
  }
  .article-body ol li::marker {
    color: var(--primary);
    font-weight: 600;
  }
  .article-body blockquote {
    border-left: 4px solid var(--primary);
    background: var(--primary-light);
    padding: 18px 24px;
    margin: 24px 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
  }
  .article-body blockquote p:last-child {
    margin-bottom: 0;
  }
  .article-body pre {
    background: #1A2B3D;
    color: #EAF1F8;
    padding: 20px 24px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    line-height: 1.7;
    font-size: 0.875rem;
    margin: 24px 0;
  }
  .article-body code {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.875rem;
  }
  .article-body pre code {
    background: transparent;
    color: inherit;
    padding: 0;
  }
  .article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.9375rem;
    line-height: 1.6;
    border-radius: var(--radius-sm);
    overflow: hidden;
  }
  .article-body table th {
    background: var(--primary-light);
    color: var(--text);
    padding: 12px 16px;
    border: 1px solid var(--border);
    text-align: left;
    font-weight: 600;
  }
  .article-body table td {
    padding: 10px 16px;
    border: 1px solid var(--border);
    color: #33475B;
    background: var(--white);
  }
  .article-body table tr:nth-child(even) td {
    background: #FAFCFE;
  }
  .article-body img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    display: block;
    margin: 24px auto;
    box-shadow: var(--shadow-xs);
  }
  .article-body figure {
    margin: 24px 0;
  }
  .article-body figure img {
    margin-bottom: 8px;
  }
  .article-body figcaption {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.8125rem;
    line-height: 1.5;
  }
  .article-body a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
  }
  .article-body a:hover {
    color: var(--accent);
  }

  /* 标签区 */
  .article-tags {
    margin-top: 36px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }
  .tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.8125rem;
    padding: 6px 14px;
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: background .2s ease;
  }
  .tag:hover {
    background: var(--primary-lighter);
  }

  /* 返回按钮区 */
  .article-back {
    margin-top: 28px;
  }

  /* 空态 */
  .article-empty {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 80px 40px;
    text-align: center;
  }
  .article-empty .empty-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border);
    border-radius: 50%;
    color: var(--text-tertiary);
    font-size: 1.75rem;
  }
  .article-empty p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 20px;
  }

  /* ===== 侧栏 ===== */
  .sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: sticky;
    top: 100px;
  }
  .sidebar-widget {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 28px 24px;
  }
  .sidebar-feature {
    padding: 0;
    overflow: hidden;
  }
  .sidebar-feature img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
  }
  .sidebar-feature p {
    padding: 16px 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
  }
  .widget-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 20px;
    padding-left: 12px;
    position: relative;
    line-height: 1.4;
  }
  .widget-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    width: 4px;
    height: 18px;
    background: var(--primary);
    border-radius: 2px;
  }
  .related-list {
    list-style: none;
    padding: 0;
    margin: 0;
  }
  .related-list li {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }
  .related-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  .related-list li:first-child {
    padding-top: 0;
  }
  .related-list a {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
    line-height: 1.5;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color .2s ease;
    margin-bottom: 4px;
  }
  .related-list a:hover {
    color: var(--primary);
  }
  .related-list .time {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
  }
  .related-empty {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    padding: 8px 0;
  }
  .category-list {
    list-style: none;
    padding: 0;
    margin: 0;
  }
  .category-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }
  .category-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  .category-list li:first-child {
    padding-top: 0;
  }
  .category-list a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
    transition: color .2s ease;
  }
  .category-list a:hover {
    color: var(--primary);
  }
  .category-list span {
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.8125rem;
    padding: 2px 10px;
    border-radius: var(--radius-lg);
    font-weight: 500;
  }

  /* ===== 页脚 ===== */
  .site-footer {
    background: #1A2B3D;
    color: #B0C1D0;
    padding: 64px 0 0;
    margin-top: 0;
  }
  .footer-grid {
    padding-bottom: 40px;
  }
  .footer-logo {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: 16px;
  }
  .footer-logo .logo-main {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
  }
  .footer-logo .logo-sub {
    font-size: 0.875rem;
    color: #B0C1D0;
  }
  .footer-desc {
    font-size: 0.875rem;
    line-height: 1.7;
    color: #B0C1D0;
    margin-bottom: 16px;
    max-width: 320px;
  }
  .footer-icp {
    font-size: 0.8125rem;
    color: #7A8FA3;
  }
  .footer-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: 0.02em;
  }
  .footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
  }
  .footer-links li {
    margin-bottom: 10px;
  }
  .footer-links a {
    font-size: 0.875rem;
    color: #B0C1D0;
    transition: color .2s ease;
  }
  .footer-links a:hover {
    color: var(--white);
  }
  .footer-contact {
    font-size: 0.875rem;
    line-height: 1.7;
    color: #B0C1D0;
  }
  .footer-btm {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 20px 0;
    text-align: center;
  }
  .footer-btm p {
    font-size: 0.8125rem;
    color: #7A8FA3;
  }

  /* ===== 响应式 ===== */
  @media (max-width: 1024px) {
    .article-body-wrap .large-8 {
      padding-right: 16px;
    }
    .article-card {
      padding: 32px 32px;
    }
    .nav-link {
      padding: 0 14px;
      font-size: 0.875rem;
    }
  }

  @media (max-width: 768px) {
    .container {
      padding: 0 16px;
    }
    .article-header {
      padding: 120px 0 32px;
    }
    .article-body-wrap {
      padding: 32px 0;
    }
    .article-body-wrap .large-8 {
      padding-right: 0;
      margin-bottom: 32px;
    }
    .sidebar {
      position: static;
    }
    .article-card {
      padding: 24px 20px;
    }
    .article-body h2 {
      font-size: 1.375rem;
    }
    .article-body h3 {
      font-size: 1.125rem;
    }
    .article-body {
      font-size: 0.9375rem;
    }
    .footer-grid .column {
      margin-bottom: 32px;
    }
  }

  @media (max-width: 640px) {
    .site-header {
      padding: 8px 12px 0;
    }
    .nav-capsule {
      height: 56px;
      border-radius: 16px;
      padding: 0 12px;
      background: rgba(255, 255, 255, 0.95);
    }
    .nav-logo .logo-main {
      font-size: 1.125rem;
    }
    .nav-logo .logo-sub {
      font-size: 0.75rem;
    }
    .nav-links {
      display: none;
      position: absolute;
      top: calc(100% + 8px);
      left: 0;
      right: 0;
      background: var(--white);
      border-radius: 16px;
      box-shadow: var(--shadow-md);
      flex-direction: column;
      gap: 4px;
      padding: 12px;
      z-index: 100;
      opacity: 0;
      transform: translateY(-8px);
      transition: opacity .2s ease, transform .2s ease;
    }
    .nav-links.open {
      display: flex;
      opacity: 1;
      transform: translateY(0);
    }
    .nav-link {
      width: 100%;
      justify-content: flex-start;
      height: 44px;
      padding: 0 16px;
      border-bottom: 1px solid var(--border);
      border-radius: 0;
    }
    .nav-link:last-child {
      border-bottom: none;
    }
    .nav-link.active {
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary);
    }
    .nav-cta {
      display: none;
    }
    .nav-toggle {
      display: flex;
    }
    .article-header h1 {
      font-size: 1.5rem;
    }
    .breadcrumb {
      font-size: 0.8125rem;
    }
    .breadcrumb .current {
      max-width: 160px;
    }
    .article-meta {
      gap: 12px;
      font-size: 0.8125rem;
    }
    .meta-views::before {
      margin-right: 8px;
    }
    .article-card {
      padding: 20px 16px;
      border-radius: 10px;
    }
    .article-tags {
      gap: 8px;
    }
    .tag {
      font-size: 0.75rem;
      padding: 4px 12px;
    }
    .sidebar-widget {
      padding: 20px 16px;
    }
    .related-list a {
      font-size: 0.875rem;
    }
  }

/* roulang page: category2 */
:root {
  --primary: #1B5F9C;
  --primary-dark: #154F82;
  --primary-light: #EAF1F8;
  --primary-lighter: #DCE8F3;
  --accent: #F25C3A;
  --accent-light: #FEF3EF;
  --bg: #F5F8FB;
  --card-bg: #FFFFFF;
  --text: #1A2B3D;
  --text-secondary: #526A82;
  --text-muted: #8A9BAE;
  --border: #E4EBF2;
  --shadow-xs: 0 2px 12px rgba(27, 95, 156, 0.06);
  --shadow-sm: 0 4px 20px rgba(27, 95, 156, 0.08);
  --shadow-md: 0 12px 36px rgba(27, 95, 156, 0.14);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --container-w: 1200px;
  --transition: 0.25s ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--accent);
}

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

button,
input {
  font-family: inherit;
}

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

.container .row {
  max-width: 100%;
}

/* ==== Header / Nav ==== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 14px 0 0;
  transition: padding var(--transition);
}

.nav-capsule {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-xs);
  height: 64px;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid rgba(255, 255, 255, 0.6);
  transition: box-shadow var(--transition), background var(--transition);
}

.site-header.is-scrolled {
  padding-top: 8px;
}

.site-header.is-scrolled .nav-capsule {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow-md);
}

.nav-logo {
  display: flex;
  align-items: baseline;
  gap: 2px;
  line-height: 1;
  white-space: nowrap;
}

.logo-main {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.logo-sub {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 24px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
}

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

.nav-link.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(27, 95, 156, 0.25);
}

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

.nav-cta {
  flex-shrink: 0;
  margin-left: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 28px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.btn:focus-visible,
.nav-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  box-shadow: 0 8px 20px rgba(27, 95, 156, 0.22);
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

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

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

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

.btn-outline-white {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: #fff;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: var(--primary-light);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--primary);
  border-radius: 4px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==== Category Hero ==== */
.category-hero {
  position: relative;
  background: linear-gradient(rgba(245, 248, 251, 0.92), rgba(245, 248, 251, 0.92)), url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  padding: 160px 0 88px;
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

.breadcrumb a:hover {
  color: var(--accent);
}

.breadcrumb .divider {
  color: var(--text-muted);
  margin: 0 4px;
}

.category-hero h1 {
  font-size: clamp(2.2rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
  margin: 0 0 16px;
}

.category-hero .hero-sub {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 0 32px;
}

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

/* ==== Section Common ==== */
.section {
  padding: 72px 0;
}

.section-sm {
  padding: 56px 0;
}

.section-dark {
  background: var(--primary);
  color: #fff;
}

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

.section-head .section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  border-radius: var(--radius-pill);
  padding: 4px 14px;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--text);
}

.section-head .section-sub {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 640px;
}

/* ==== Feature Strip ==== */
.feature-strip {
  margin-top: -32px;
  position: relative;
  z-index: 2;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.feature-item {
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 24px 20px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

.feature-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-item .feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  margin-bottom: 14px;
}

.feature-item h4 {
  font-size: 1.02rem;
  font-weight: 600;
  margin: 0 0 4px;
  color: var(--text);
}

.feature-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

/* ==== Guide Cards ==== */
.guide-cards .row {
  margin-bottom: -24px;
}

.guide-card {
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: transform var(--transition), box-shadow var(--transition);
}

.guide-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.guide-card .card-media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  position: relative;
}

.guide-card .card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.guide-card:hover .card-media img {
  transform: scale(1.05);
}

.guide-card .card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.guide-card .card-tag {
  align-self: flex-start;
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--primary);
  background: var(--primary-light);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  margin-bottom: 10px;
}

.guide-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 0 0 8px;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.guide-card .card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0 0 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.guide-card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  background: none;
  border: none;
  padding: 4px 0;
  cursor: pointer;
  transition: color var(--transition), gap var(--transition);
}

.guide-card .card-link i {
  transition: transform var(--transition);
}

.guide-card .card-link:hover {
  color: var(--accent);
}

.guide-card .card-link:hover i {
  transform: translateX(4px);
}

/* ==== Steps ==== */
.steps-section {
  background: #fff;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  counter-reset: step;
  position: relative;
}

.step-item {
  position: relative;
  padding: 28px 20px 20px;
  text-align: center;
}

.step-item .step-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 1.3rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.step-item h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--text);
}

.step-item p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.7;
}

.step-item::after {
  content: '';
  position: absolute;
  top: 40px;
  right: -14px;
  width: 28px;
  height: 1px;
  background: var(--border);
  border-top: 1px dashed var(--primary-lighter);
}

.step-item:last-child::after {
  display: none;
}

/* ==== FAQ ==== */
.faq-section {
  background: var(--bg);
}

.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

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

.accordion-item {
  background: #fff;
  border-radius: 12px;
  box-shadow: var(--shadow-xs);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.accordion-item.is-active {
  box-shadow: var(--shadow-sm);
}

.accordion-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.accordion-title:hover {
  background: var(--bg);
  color: var(--primary);
}

.accordion-title::after {
  content: '+';
  font-size: 24px;
  font-weight: 300;
  color: var(--primary);
  line-height: 1;
  transition: transform var(--transition);
  flex-shrink: 0;
}

.accordion-item.is-active .accordion-title::after {
  content: '×';
  transform: rotate(90deg);
}

.accordion-content {
  padding: 0 24px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  margin-top: 0;
}

.accordion-content p:last-child {
  margin-bottom: 0;
}

/* ==== CTA Banner ==== */
.cta-banner {
  background: var(--primary);
  padding: 72px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  right: -120px;
  top: -120px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
}

.cta-banner::after {
  content: '';
  position: absolute;
  left: -80px;
  bottom: -80px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
}

.cta-banner .cta-inner {
  position: relative;
  z-index: 2;
}

.cta-banner h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: #fff;
  margin: 0 0 10px;
  line-height: 1.3;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.82);
  font-size: 1rem;
  margin: 0 0 32px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==== Footer ==== */
.site-footer {
  background: #1A2B3D;
  color: #B0C1D0;
  padding: 72px 0 0;
}

.footer-logo {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 16px;
}

.footer-logo .logo-main {
  color: #fff;
  font-size: 1.5rem;
}

.footer-logo .logo-sub {
  color: #8A9BAE;
}

.footer-desc {
  font-size: 0.88rem;
  line-height: 1.8;
  color: #8A9BAE;
  margin: 0 0 20px;
  max-width: 320px;
}

.footer-icp {
  font-size: 12px;
  color: #64788B;
  margin: 0;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin: 0 0 20px;
  padding-top: 4px;
}

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

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

.footer-links a {
  color: #8A9BAE;
  font-size: 0.9rem;
  transition: color var(--transition), padding-left var(--transition);
}

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

.footer-contact {
  font-size: 0.88rem;
  color: #8A9BAE;
  line-height: 1.8;
  margin: 0;
}

.footer-btm {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 24px 0;
  margin-top: 56px;
  text-align: center;
}

.footer-btm p {
  font-size: 12px;
  color: #64788B;
  margin: 0;
}

/* ==== Responsive ==== */
@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .step-item::after {
    display: none;
  }

  .section {
    padding: 56px 0;
  }

  .category-hero {
    padding: 140px 0 64px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    left: 0;
    background: #fff;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    gap: 4px;
    margin: 0;
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-link {
    padding: 14px 20px;
    justify-content: center;
    font-size: 15px;
  }

  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 16px;
  }

  .category-hero {
    padding: 120px 0 48px;
  }

  .category-hero h1 {
    font-size: 2rem;
  }

  .category-hero .hero-sub {
    font-size: 1rem;
  }

  .hero-actions .btn {
    flex: 1;
    justify-content: center;
  }

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

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

  .step-item {
    padding: 16px 12px;
  }

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

  .cta-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .footer-grid .column {
    margin-bottom: 32px;
  }
}

@media (max-width: 480px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .nav-capsule {
    height: 58px;
    padding: 0 16px;
  }

  .logo-main {
    font-size: 1.15rem;
  }

  .logo-sub {
    font-size: 0.75rem;
  }
}