/* roulang page: index */
:root {
  --primary: #3B7EA1;
  --primary-deep: #2C6078;
  --primary-weak: #EAF2F7;
  --accent: #C9934B;
  --accent-deep: #B88237;
  --ink: #263B4F;
  --ink-light: #546E82;
  --bg-page: #F7F9FB;
  --bg-card: #FFFFFF;
  --border: #E3EAF2;
  --shadow-card: 0 4px 20px rgba(38,59,79,0.07);
  --shadow-card-hover: 0 14px 34px rgba(38,59,79,0.12);
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-command: 10px;
  --font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--primary); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--primary-deep); text-decoration: underline; }

button, input { font-family: inherit; }

.container { max-width: 1200px; }

.section { padding: 96px 0; }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.section-head .section-index {
  display: inline-flex;
  align-items: center;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--primary);
  background: var(--primary-weak);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 1.875rem;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0;
}

.section-sub {
  font-size: 1rem;
  color: var(--ink-light);
  margin: 10px 0 0;
  max-width: 560px;
}

/* Buttons */
.btn-main {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  background: var(--accent);
  color: #2B2114;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-command);
  border: none;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}
.btn-main:hover {
  background: var(--accent-deep);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(201,147,75,0.28);
  text-decoration: none;
}
.btn-main:active { transform: translateY(0); }
.btn-main:focus-visible { outline: 3px solid rgba(59,126,161,0.35); outline-offset: 2px; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  background: #fff;
  color: var(--primary-deep);
  font-weight: 600;
  font-size: 0.9375rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-command);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}
.btn-ghost:hover {
  border-color: var(--primary);
  background: var(--primary-weak);
  color: var(--primary-deep);
  text-decoration: none;
}

.btn-main.btn-lg { height: 52px; padding: 0 36px; font-size: 1.0625rem; }
.btn-main.btn-sm-nav { height: 38px; padding: 0 18px; font-size: 0.875rem; }

/* Badge */
.badge-custom {
  display: inline-flex;
  align-items: center;
  background: var(--primary-weak);
  color: var(--primary-deep);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 4px 12px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1050;
  height: 72px;
  background: rgba(247,249,251,0.75);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.navbar-main {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--primary-weak);
  color: var(--primary-deep);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9375rem;
  border: 1px solid rgba(59,126,161,0.2);
}

.brand-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-deep);
  letter-spacing: -0.01em;
}
.brand:hover .brand-text { color: var(--primary); }

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

.nav-link {
  font-size: 0.9375rem;
  color: var(--ink-light);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  text-decoration: none;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  height: 2px;
  width: 0;
  background: var(--accent);
  transition: width 0.2s ease;
}
.nav-link:hover { color: var(--ink); text-decoration: none; }
.nav-link:hover::after { width: 100%; }
.nav-link.active { color: var(--primary-deep); font-weight: 600; }
.nav-link.active::after { width: 100%; }

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

.search-box {
  position: relative;
  width: 200px;
  height: 36px;
  display: flex;
  align-items: center;
  background: #F1F5F9;
  border-radius: var(--radius-command);
  border: 1px solid transparent;
  padding: 0 10px 0 34px;
  transition: all 0.25s ease;
}
.search-box i {
  position: absolute;
  left: 11px;
  color: var(--ink-light);
  font-size: 0.8125rem;
}
.search-box input {
  width: 100%;
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.875rem;
  color: var(--ink);
}
.search-box input::placeholder { color: #8AA0B2; }
.search-box:focus-within {
  width: 260px;
  background: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59,126,161,0.18);
}
.search-kbd {
  position: absolute;
  right: 8px;
  font-size: 0.6875rem;
  color: var(--ink-light);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
  line-height: 1.4;
  pointer-events: none;
}

.search-icon-btn {
  display: none;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--ink-light);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.search-icon-btn:hover { border-color: var(--primary); color: var(--primary); }

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  align-items: center;
  padding: 0;
}
.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all 0.25s ease;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-search-bar {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  z-index: 1049;
}
.mobile-search-bar.open { display: block; }
.mobile-search-bar input {
  width: 100%;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-command);
  padding: 0 14px;
  font-size: 0.9375rem;
  outline: none;
}
.mobile-search-bar input:focus { border-color: var(--primary); }

.nav-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: #fff;
  z-index: 1048;
  border-bottom: 1px solid var(--border);
  padding: 8px 16px 16px;
  display: none;
  box-shadow: 0 20px 30px rgba(38,59,79,0.08);
}
.nav-drawer.open { display: block; }
.drawer-link {
  display: block;
  height: 52px;
  line-height: 52px;
  font-size: 1rem;
  color: var(--ink);
  border-bottom: 1px solid var(--border);
  padding: 0 6px;
  text-decoration: none;
}
.drawer-link:last-child { border-bottom: none; }
.drawer-link:hover { color: var(--primary); text-decoration: none; }
.drawer-link.active { color: var(--primary-deep); font-weight: 600; }

/* Hero */
.hero {
  position: relative;
  padding: 168px 0 80px;
  background: linear-gradient(180deg, rgba(247,249,251,0.9) 0%, rgba(247,249,251,0.96) 65%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.hero .row { align-items: center; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-weak);
  color: var(--primary-deep);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 20px;
  border: 1px solid rgba(59,126,161,0.15);
}

.hero-title {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 20px;
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--ink-light);
  line-height: 1.7;
  max-width: 520px;
  margin-bottom: 32px;
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }

.hero-visual { position: relative; }

.hero-visual .hero-img-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: #fff;
  border: 1px solid var(--border);
}

.hero-visual .hero-img-wrap img {
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
}

.hero-float-badge {
  position: absolute;
  left: -18px;
  bottom: 20px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--primary-deep);
  box-shadow: var(--shadow-card);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.hero-float-badge i { color: var(--accent); }

.hero-trust {
  margin-top: 64px;
  border-top: 1px solid var(--border);
  padding-top: 40px;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.trust-item { text-align: left; }

.trust-item .trust-num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.trust-item .trust-label {
  font-size: 0.875rem;
  color: var(--ink-light);
  margin-top: 4px;
}

/* Pain */
.pain-section { background: var(--bg-page); }

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

.pain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
  position: relative;
}
.pain-card::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 28px;
  width: 32px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.pain-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
  border-color: var(--primary-weak);
}

.pain-quote {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink);
  margin: 32px 0 20px;
  quotes: "\201C" "\201D";
}
.pain-quote::before { content: "\201C"; color: var(--primary); font-size: 1.4em; line-height: 1; margin-right: 2px; }
.pain-quote::after { content: "\201D"; color: var(--primary); font-size: 1.4em; line-height: 1; margin-left: 2px; }

.pain-tag { margin-top: 8px; }

.pain-transition {
  text-align: center;
  margin-top: 56px;
  font-size: 1rem;
  color: var(--ink-light);
}

.pain-transition strong { color: var(--primary-deep); font-weight: 600; }

/* Solution */
.solution-section { background: #fff; }

.solution-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 56px;
}
.solution-block:last-child { margin-bottom: 0; }

.solution-block.reverse .solution-img { order: 2; }
.solution-block.reverse .solution-content { order: 1; }

.solution-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border);
}
.solution-img img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }

.solution-content h3 {
  font-size: 1.125rem;
  line-height: 1.5;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}

.solution-content p {
  color: var(--ink-light);
  font-size: 0.9375rem;
  line-height: 1.75;
  margin-bottom: 16px;
}

.solution-list { list-style: none; padding: 0; margin: 0 0 20px; }
.solution-list li {
  font-size: 0.9375rem;
  color: var(--ink);
  padding: 4px 0;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.solution-list li i { color: var(--primary); font-size: 0.875rem; margin-top: 5px; }

.solution-more {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--primary-deep);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.solution-more:hover { color: var(--primary); text-decoration: none; }
.solution-more i { transition: transform 0.2s ease; }
.solution-more:hover i { transform: translateX(4px); }

/* Stats */
.stats-section {
  background: linear-gradient(135deg, var(--primary-deep) 0%, #234F62 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.stats-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  opacity: 0.08;
}

.stats-section .section-title { color: #fff; }
.stats-section .section-sub { color: rgba(255,255,255,0.75); }
.stats-section .container { position: relative; z-index: 1; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.stats-item {
  text-align: center;
  padding: 32px 20px;
  border-right: 1px solid rgba(255,255,255,0.18);
}
.stats-item:last-child { border-right: none; }

.stats-item .stats-num {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.stats-item .stats-label {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.85);
  margin-top: 8px;
  letter-spacing: 0.02em;
}

/* News */
.news-section { background: var(--bg-page); }

.post-list { margin-top: 8px; }

.post-list-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
  height: 88px;
}

.post-list-item:hover {
  border-color: var(--primary);
  background: var(--primary-weak);
  box-shadow: var(--shadow-card);
  text-decoration: none;
}

.post-cat { flex-shrink: 0; }

.post-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
}

.post-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
  line-height: 1.5;
}
.post-list-item:hover .post-title { color: var(--primary); }

.post-excerpt {
  font-size: 0.8125rem;
  color: var(--ink-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

.post-date {
  font-size: 0.8125rem;
  color: var(--ink-light);
  white-space: nowrap;
  flex-shrink: 0;
}

.post-empty {
  border: 2px dashed var(--border);
  background: var(--bg-page);
  border-radius: var(--radius-lg);
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-light);
  font-size: 0.9375rem;
}

.section-link-all {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary-deep);
  text-decoration: none;
  white-space: nowrap;
}
.section-link-all:hover { color: var(--primary); text-decoration: none; }
.section-link-all i { margin-left: 4px; transition: transform 0.2s ease; }
.section-link-all:hover i { transform: translateX(3px); }

/* Testimonial */
.testimonial-section { background: #fff; }

.testimonial-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
}

.testimonial-stars { color: var(--accent); font-size: 1rem; margin-bottom: 16px; letter-spacing: 2px; }

.testimonial-quote {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 28px;
  flex: 1;
}

.testimonial-author { display: flex; align-items: center; gap: 14px; }

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--primary-weak);
}

.testimonial-name { font-weight: 600; font-size: 0.9375rem; color: var(--ink); line-height: 1.3; }
.testimonial-role { font-size: 0.8125rem; color: var(--ink-light); }

.testimonial-summary {
  background: var(--primary-weak);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  border: 1px solid rgba(59,126,161,0.12);
}

.testimonial-summary .summary-num {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  margin-bottom: 8px;
}

.testimonial-summary .summary-text {
  font-size: 0.9375rem;
  color: var(--ink-light);
  line-height: 1.6;
}

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

.faq-accordion { max-width: 840px; }

.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.faq-item:hover { border-color: var(--primary-weak); box-shadow: var(--shadow-card); }

.faq-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 20px;
  height: 60px;
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  transition: color 0.2s ease;
}
.faq-item-header:hover { color: var(--primary-deep); }

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.125rem;
  transition: transform 0.25s ease;
}
.faq-item:has(.faq-item-header[aria-expanded="true"]) .faq-icon,
.faq-item-header[aria-expanded="true"] .faq-icon { transform: rotate(45deg); }

.faq-item-body {
  padding: 0 20px 20px;
  color: var(--ink-light);
  font-size: 0.9375rem;
  line-height: 1.75;
}

/* CTA */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(180deg, rgba(247,249,251,0.92) 0%, rgba(234,242,247,0.6) 100%), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  border-top: 1px solid var(--border);
}

.cta-inner { text-align: center; max-width: 680px; margin: 0 auto; }

.cta-inner h2 {
  font-size: 1.875rem;
  line-height: 1.3;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 16px;
}

.cta-inner .cta-support {
  font-size: 1rem;
  color: var(--ink-light);
  margin-bottom: 32px;
  line-height: 1.7;
}

.cta-buttons { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

.cta-form {
  margin-top: 36px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.cta-form .form-input {
  height: 44px;
  border: 1px solid #D4DEE8;
  border-radius: var(--radius-command);
  padding: 0 16px;
  font-size: 0.9375rem;
  width: 200px;
  background: #fff;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.cta-form .form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59,126,161,0.18);
}
.cta-form .form-input::placeholder { color: #8AA0B2; }

.form-note {
  display: block;
  margin-top: 16px;
  font-size: 0.875rem;
  color: var(--primary-deep);
  min-height: 20px;
}

/* Footer */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,0.85);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 40px;
}

.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; text-decoration: none; }
.footer-brand .brand-mark { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.15); color: #fff; }
.footer-brand .brand-text { color: #fff; }

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.65);
  margin-bottom: 24px;
  max-width: 320px;
}

.footer-social { display: flex; gap: 12px; }
.social-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.75);
  font-size: 0.9375rem;
  transition: all 0.2s ease;
}
.social-icon:hover { background: var(--primary); color: #fff; border-color: var(--primary); text-decoration: none; }

.footer-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: rgba(255,255,255,0.65);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-links a:hover { color: #fff; padding-left: 4px; }

.footer-contact { list-style: none; padding: 0; margin: 0; }
.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  margin-bottom: 12px;
  line-height: 1.6;
}
.footer-contact li i { color: var(--accent); margin-top: 5px; width: 16px; text-align: center; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom .copyright {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.55);
  margin: 0;
}

.back-top {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  font-size: 0.875rem;
  transition: all 0.2s ease;
  text-decoration: none;
}
.back-top:hover { background: var(--accent); color: #fff; border-color: var(--accent); text-decoration: none; }

/* Focus accessibility */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 3px solid rgba(59,126,161,0.35);
  outline-offset: 2px;
}

/* Responsive */
@media (max-width: 991.98px) {
  .section { padding: 80px 0; }
  .nav-links { display: none; }
  .search-box { display: none; }
  .search-icon-btn { display: inline-flex; }
  .hamburger { display: flex; }
  .nav-actions { gap: 10px; }
  .hero { padding: 132px 0 64px; }
  .hero-visual { margin-top: 48px; }
  .hero-float-badge { left: 12px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stats-item { border-right: none; background: rgba(255,255,255,0.06); border-radius: 12px; }
  .solution-block { grid-template-columns: 1fr; gap: 32px; }
  .solution-block.reverse .solution-img { order: 0; }
  .solution-block.reverse .solution-content { order: 0; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 767.98px) {
  .section { padding: 56px 0; }
  body { font-size: 0.9375rem; }
  .section-title { font-size: 1.625rem; }
  .section-head { margin-bottom: 32px; }
  .hero { padding: 116px 0 56px; }
  .hero-title { font-size: clamp(2rem, 8vw, 2.4rem); }
  .hero-sub { font-size: 1rem; }
  .hero-cta .btn-main, .hero-cta .btn-ghost { width: calc(80% - 7px); }
  .hero-cta { justify-content: center; }
  .trust-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .pain-grid { grid-template-columns: 1fr; }
  .post-list-item { height: auto; flex-wrap: wrap; padding: 14px 16px; }
  .post-cat { margin-bottom: 4px; }
  .post-main { width: 100%; }
  .post-date { position: static; }
  .testimonial-card, .testimonial-summary { padding: 24px; }
  .cta-section { padding: 56px 0; }
  .cta-form .form-input { width: 100%; }
  .cta-form .btn-main { width: 100%; }
  .btn-main.btn-lg { width: 100%; max-width: 320px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { justify-content: center; text-align: center; }
  .nav-actions .btn-sm-nav { display: none; }
}

@media (max-width: 575.98px) {
  .container { padding-left: 16px; padding-right: 16px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stats-item .stats-num { font-size: 2rem; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .solution-content h3 { font-size: 1.0625rem; }
  .hero-cta .btn-main, .hero-cta .btn-ghost { width: 100%; }
}

/* roulang page: category1 */
:root {
  --primary: #3B7EA1;
  --primary-deep: #2C6078;
  --primary-weak: #EAF2F7;
  --accent: #C9934B;
  --ink: #263B4F;
  --ink-light: #546E82;
  --bg-page: #F7F9FB;
  --bg-card: #FFFFFF;
  --border: #E3EAF2;
  --shadow-card: 0 4px 20px rgba(38, 59, 79, 0.07);
  --shadow-card-hover: 0 14px 34px rgba(38, 59, 79, 0.12);
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-command: 10px;
  --font-base: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-base);
  background: var(--bg-page);
  color: var(--ink);
  line-height: 1.75;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--primary-deep); text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button, input { font-family: inherit; }
.container { max-width: 1200px; padding-left: 16px; padding-right: 16px; margin-left: auto; margin-right: auto; }
html, body { overflow-x: hidden; }

/* 排版 */
.display-title { font-size: clamp(2rem, 4vw, 2.6rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; color: var(--ink); }
.section-title { font-size: 1.875rem; font-weight: 700; line-height: 1.3; letter-spacing: -0.01em; color: var(--ink); }
.section-sub { font-size: 1rem; line-height: 1.75; color: var(--ink-light); margin-top: 8px; }
.card-title-sm { font-size: 1.125rem; font-weight: 600; line-height: 1.5; }
.text-muted-light { color: var(--ink-light); font-size: 0.875rem; }

/* 导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1030;
  height: 72px;
  background: rgba(247, 249, 251, 0.85);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.navbar-main { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--primary-weak);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary-deep); font-size: 1rem;
  border: 1px solid #d0e0eb;
}
.brand-text { font-size: 1.25rem; font-weight: 700; color: var(--primary-deep); letter-spacing: -0.01em; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-link {
  font-size: 0.9375rem; color: var(--ink-light);
  position: relative; padding: 8px 0;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.nav-link:hover { color: var(--ink); text-decoration: none; border-bottom-color: var(--accent); }
.nav-link.active { color: var(--primary-deep); border-bottom-color: var(--accent); }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.search-box {
  display: flex; align-items: center;
  width: 200px; height: 36px;
  background: #F1F5F9;
  border-radius: var(--radius-command);
  border: 1px solid transparent;
  padding: 0 10px; gap: 8px;
  transition: width 0.25s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.search-box:focus-within {
  width: 260px; background: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 126, 161, 0.18);
}
.search-box i { color: var(--ink-light); font-size: 0.875rem; }
.search-box input {
  flex: 1; border: none; background: transparent; outline: none;
  font-size: 0.875rem; color: var(--ink);
}
.search-box input::placeholder { color: #8AA0B2; }
.search-kbd {
  font-size: 0.6875rem; color: var(--ink-light);
  background: #fff; border: 1px solid var(--border);
  border-radius: 6px; padding: 1px 6px;
}
.search-icon-btn { display: none; width: 36px; height: 36px; border-radius: 10px; background: #F1F5F9; border: none; color: var(--ink-light); align-items: center; justify-content: center; cursor: pointer; }
.btn-main {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--accent); color: #2B2115;
  height: 44px; padding: 0 24px; border: none;
  border-radius: var(--radius-command);
  font-weight: 600; font-size: 0.9375rem;
  cursor: pointer; transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}
.btn-main:hover { background: #B88237; color: #2B2115; transform: translateY(-1px); box-shadow: 0 8px 20px rgba(201, 147, 75, 0.25); text-decoration: none; }
.btn-main:active { transform: translateY(0); box-shadow: none; }
.btn-sm-nav { height: 38px; padding: 0 18px; font-size: 0.875rem; }
.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center;
  background: #fff; color: var(--primary-deep);
  height: 44px; padding: 0 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-command);
  font-weight: 600; font-size: 0.9375rem;
  cursor: pointer; transition: all 0.2s ease; text-decoration: none;
}
.btn-ghost:hover { border-color: var(--primary); background: var(--primary-weak); color: var(--primary-deep); text-decoration: none; }
.hamburger { display: none; flex-direction: column; justify-content: center; gap: 5px; width: 38px; height: 38px; background: none; border: none; cursor: pointer; padding: 0 8px; }
.hamburger span { display: block; height: 2px; background: var(--ink); border-radius: 2px; }
.mobile-search-bar { display: none; padding: 12px 16px; background: var(--bg-card); border-bottom: 1px solid var(--border); }
.mobile-search-bar input {
  width: 100%; height: 40px; border: 1px solid var(--border);
  border-radius: var(--radius-command); padding: 0 14px; font-size: 0.9375rem;
  background: #F1F5F9; outline: none;
}
.mobile-search-bar input:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(59, 126, 161, 0.18); }
.menu-drawer { display: none; position: fixed; inset: 72px 0 auto 0; background: #fff; z-index: 1029; border-bottom: 1px solid var(--border); padding: 8px 0; box-shadow: 0 20px 40px rgba(38, 59, 79, 0.08); }
.menu-drawer a {
  display: block; padding: 0 20px; height: 52px; line-height: 52px;
  font-size: 1rem; color: var(--ink); border-bottom: 1px solid var(--border);
  text-decoration: none;
}
.menu-drawer a:last-child { border-bottom: none; }
.menu-drawer a.active { color: var(--primary-deep); background: var(--primary-weak); font-weight: 600; }
.menu-drawer a:hover { background: var(--primary-weak); text-decoration: none; }
.menu-drawer.open { display: block; }

/* Hero 分类 */
.category-hero {
  padding: 120px 0 72px;
  background: linear-gradient(180deg, var(--primary-weak) 0%, var(--bg-page) 70%),
              url('/assets/images/backpic/back-1.webp') no-repeat center center / cover;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.category-hero .hero-inner { display: flex; align-items: center; gap: 48px; }
.category-hero .hero-copy { flex: 1 1 62%; }
.category-hero .hero-media { flex: 1 1 38%; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.8125rem;
  color: var(--primary-deep);
  font-weight: 500;
  margin-bottom: 24px;
}
.hero-badge i { color: var(--accent); }
.category-hero h1 { font-size: clamp(1.875rem, 3.5vw, 2.375rem); font-weight: 700; line-height: 1.2; color: var(--ink); margin-bottom: 20px; }
.category-hero p { color: var(--ink-light); font-size: 1rem; line-height: 1.8; max-width: 640px; }
.hero-media img { border-radius: 18px; box-shadow: var(--shadow-card); }
.hero-media .cover-wrap { position: relative; }
.hero-float-tag {
  position: absolute; right: 16px; bottom: 16px;
  background: rgba(255,255,255,0.92);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.8125rem;
  color: var(--primary-deep);
  display: flex; align-items: center; gap: 6px;
  box-shadow: 0 4px 14px rgba(38,59,79,0.08);
}
.hero-float-tag i { color: var(--accent); }

/* 指标统计 */
.stats-section { padding: 56px 0 64px; }
.stats-panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-card); padding: 40px; }
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stats-row + .stats-row { margin-top: 32px; padding-top: 32px; border-top: 1px solid var(--border); }
.stat-item { text-align: center; }
.stat-num { font-size: 2.5rem; font-weight: 700; color: var(--accent); line-height: 1.2; letter-spacing: -0.02em; }
.stat-label { font-size: 0.875rem; color: var(--ink-light); margin-top: 4px; }
.stat-desc { font-size: 0.8125rem; color: var(--ink-light); margin-top: 6px; }
.stats-title { text-align: center; margin-bottom: 28px; }

/* 编号卡 */
.feature-cards { padding: 72px 0; }
.feature-cards .section-head { text-align: center; margin-bottom: 40px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px 24px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
  position: relative;
}
.feature-item::before {
  content: '';
  position: absolute; top: 0; left: 24px; right: 24px;
  height: 2px; background: var(--primary-weak);
  border-radius: 2px;
}
.feature-item:hover { box-shadow: var(--shadow-card-hover); border-color: var(--primary-weak); transform: translateY(-3px); }
.feature-no { font-size: 1rem; font-weight: 700; color: var(--accent); letter-spacing: 0.08em; margin-bottom: 16px; display: block; }
.feature-item h3 { font-size: 1.125rem; font-weight: 600; color: var(--ink); margin-bottom: 12px; }
.feature-item p { font-size: 0.9375rem; color: var(--ink-light); line-height: 1.75; margin-bottom: 20px; }
.feature-tag { display: inline-block; font-size: 0.75rem; color: var(--primary-deep); background: var(--primary-weak); border-radius: 999px; padding: 3px 10px; letter-spacing: 0.02em; }

/* 内容展示区 */
.showcase-section { padding: 72px 0; background: var(--bg-card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.showcase-row { display: flex; align-items: center; gap: 48px; }
.showcase-row + .showcase-row { margin-top: 56px; }
.showcase-media { flex: 1 1 50%; }
.showcase-media img { border-radius: var(--radius-lg); box-shadow: var(--shadow-card); }
.showcase-body { flex: 1 1 50%; }
.showcase-body h3 { font-size: 1.375rem; font-weight: 700; color: var(--ink); margin-bottom: 12px; }
.showcase-body p { color: var(--ink-light); line-height: 1.8; margin-bottom: 16px; }
.showcase-body ul { margin-bottom: 16px; }
.showcase-body li { display: flex; align-items: flex-start; gap: 10px; padding: 6px 0; color: var(--ink-light); font-size: 0.9375rem; }
.showcase-body li i { color: var(--primary); margin-top: 5px; font-size: 0.8125rem; }
.showcase-link { font-weight: 600; color: var(--primary-deep); display: inline-flex; align-items: center; gap: 6px; text-decoration: none; }
.showcase-link:hover { gap: 10px; text-decoration: none; color: var(--primary); }
.showcase-link i { transition: all 0.2s ease; }

/* FAQ */
.faq-section { padding: 72px 0; }
.faq-section .section-head { text-align: center; margin-bottom: 40px; }
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-single { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); margin-bottom: 12px; overflow: hidden; transition: box-shadow 0.2s ease, border-color 0.2s ease; }
.faq-single:hover { border-color: var(--primary); box-shadow: var(--shadow-card); }
.faq-trigger {
  width: 100%; height: 60px; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between;
  background: none; border: none; cursor: pointer;
  font-size: 1rem; font-weight: 600; color: var(--ink);
  text-align: left;
}
.faq-trigger .fa-solid { color: var(--primary); font-size: 0.875rem; transition: transform 0.25s ease; }
.faq-single.open .fa-solid { transform: rotate(45deg); }
.faq-body { padding: 0 20px 20px; color: var(--ink-light); line-height: 1.75; font-size: 0.9375rem; }
.faq-body p { margin-bottom: 0; }

/* CTA */
.cta-section { padding: 72px 0; background: linear-gradient(180deg, var(--primary-weak) 0%, var(--bg-page) 100%); }
.cta-inner { text-align: center; max-width: 640px; margin: 0 auto; }
.cta-inner h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); font-weight: 700; color: var(--ink); margin-bottom: 16px; }
.cta-inner p { color: var(--ink-light); margin-bottom: 32px; }
.btn-cta { height: 52px; padding: 0 40px; font-size: 1.0625rem; }

/* 页脚 */
.site-footer { background: var(--ink); color: rgba(255, 255, 255, 0.85); padding: 56px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; margin-bottom: 32px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; font-size: 1.15rem; text-decoration: none; }
.footer-brand:hover { color: #fff; text-decoration: none; }
.footer-brand .brand-mark { background: rgba(255, 255, 255, 0.15); border-color: rgba(255, 255, 255, 0.2); color: #fff; }
.footer-desc { font-size: 0.875rem; color: rgba(255, 255, 255, 0.7); margin-top: 16px; line-height: 1.75; max-width: 320px; }
.footer-social { display: flex; gap: 12px; margin-top: 20px; }
.social-icon {
  width: 36px; height: 36px; border-radius: 10px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(255, 255, 255, 0.12); color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem; transition: all 0.2s ease;
}
.social-icon:hover { background: var(--accent); color: #2B2115; transform: translateY(-2px); }
.footer-title { font-size: 0.9375rem; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-links li, .footer-contact li { margin-bottom: 10px; }
.footer-links a { color: rgba(255, 255, 255, 0.7); font-size: 0.875rem; text-decoration: none; transition: color 0.2s ease; }
.footer-links a:hover { color: #fff; }
.footer-contact li { display: flex; align-items: flex-start; gap: 8px; font-size: 0.875rem; color: rgba(255, 255, 255, 0.75); }
.footer-contact i { color: var(--accent); margin-top: 5px; font-size: 0.8125rem; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.copyright { font-size: 0.8125rem; color: rgba(255, 255, 255, 0.55); margin: 0; }
.back-top {
  width: 32px; height: 32px; border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(255, 255, 255, 0.12); color: rgba(255, 255, 255, 0.8);
  border: none; font-size: 0.8125rem; cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}
.back-top:hover { background: var(--accent); color: #2B2115; transform: translateY(-2px); }

/* Bootstrap 覆盖 */
.btn, .btn-primary, .btn-outline-primary { border-radius: var(--radius-command) !important; font-weight: 600 !important; }
.btn-primary { background-color: var(--primary) !important; border-color: var(--primary) !important; }
.btn-primary:hover { background-color: var(--primary-deep) !important; border-color: var(--primary-deep) !important; }
.accordion-button { background: #fff !important; color: var(--ink) !important; box-shadow: none !important; }
.accordion-button:not(.collapsed) { color: var(--primary-deep) !important; background-color: var(--primary-weak) !important; }
.accordion-button:focus { box-shadow: 0 0 0 3px rgba(59, 126, 161, 0.18) !important; }
.accordion-item { border-color: var(--border) !important; }

/* 移动端断点 */
@media (max-width: 1100px) {
  .nav-links { gap: 18px; }
  .search-box { width: 170px; }
  .search-box:focus-within { width: 220px; }
}
@media (max-width: 991px) {
  .nav-links { display: none; }
  .search-box { display: none; }
  .search-icon-btn { display: inline-flex; }
  .hamburger { display: flex; }
  .category-hero .hero-inner { flex-direction: column; }
  .category-hero .hero-media { display: none; }
  .category-hero { padding-top: 110px; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .stats-panel { padding: 28px; }
  .feature-grid { grid-template-columns: 1fr; }
  .showcase-row { flex-direction: column; gap: 24px; }
  .showcase-row + .showcase-row .showcase-media { order: -1; }
}
@media (max-width: 767px) {
  body { font-size: 0.9375rem; }
  .site-header { height: 64px; }
  .navbar-main { height: 64px; }
  .brand-text { font-size: 1.1rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-panel { padding: 20px; }
  .stat-num { font-size: 1.9375rem; }
  .section-title { font-size: 1.5rem; }
  .category-hero h1 { font-size: 1.625rem; }
  .category-hero { padding-top: 96px; }
  .btn-main { padding: 0 16px; font-size: 0.875rem; }
}
@media (max-width: 575px) {
  .nav-actions .btn-sm-nav { display: none; }
  .search-icon-btn { width: 34px; height: 34px; }
  .brand-mark { width: 32px; height: 32px; font-size: 0.875rem; }
  .hero-badge { font-size: 0.75rem; }
}
@media (max-width: 520px) {
  .stats-panel { padding: 16px; }
  .stats-row { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-num { font-size: 1.75rem; }
  .feature-grid { grid-template-columns: 1fr; }
  .stat-item { padding: 12px 4px; }
}

/* roulang page: article */
:root {
            --primary: #3B7EA1;
            --primary-deep: #2C6078;
            --primary-weak: #EAF2F7;
            --accent: #C9934B;
            --ink: #263B4F;
            --ink-light: #546E82;
            --bg-page: #F7F9FB;
            --bg-card: #FFFFFF;
            --border: #E3EAF2;
            --shadow-card: 0 4px 20px rgba(38, 59, 79, 0.07);
            --shadow-card-hover: 0 14px 34px rgba(38, 59, 79, 0.12);
            --radius-md: 12px;
            --radius-lg: 18px;
            --radius-command: 10px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg-page);
            color: var(--ink);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--primary-deep);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: 1200px;
            padding-left: 16px;
            padding-right: 16px;
            margin: 0 auto;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(247, 249, 251, 0.78);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            height: 72px;
            display: flex;
            align-items: center;
        }
        .navbar-main {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            position: relative;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            flex-shrink: 0;
        }
        .brand-mark {
            width: 36px;
            height: 36px;
            background: var(--primary-weak);
            border-radius: 10px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-deep);
            font-size: 1rem;
            line-height: 1;
        }
        .brand-text {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary-deep);
            letter-spacing: -0.01em;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
        }
        .nav-link {
            font-size: 0.9375rem;
            color: var(--ink-light);
            text-decoration: none;
            padding: 7px 0;
            border-bottom: 2px solid transparent;
            transition: color 0.2s ease, border-color 0.2s ease;
            white-space: nowrap;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--primary-deep);
            border-bottom-color: var(--accent);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-shrink: 0;
        }
        .search-box {
            display: flex;
            align-items: center;
            width: 200px;
            height: 36px;
            background: #F1F5F9;
            border-radius: var(--radius-command);
            padding: 0 12px;
            gap: 8px;
            border: 1px solid transparent;
            transition: all 0.25s ease;
        }
        .search-box i {
            color: var(--ink-light);
            font-size: 0.875rem;
            line-height: 1;
        }
        .search-box input {
            flex: 1;
            min-width: 0;
            border: none;
            background: transparent;
            outline: none;
            font-size: 0.875rem;
            color: var(--ink);
            font-family: inherit;
        }
        .search-box input::placeholder {
            color: #8AA0B2;
        }
        .search-box:focus-within {
            width: 260px;
            background: #fff;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(59, 126, 161, 0.18);
        }
        .search-kbd {
            font-size: 0.75rem;
            color: var(--ink-light);
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 6px;
            padding: 1px 6px;
            font-family: inherit;
            line-height: 1.4;
            white-space: nowrap;
        }
        .search-icon-btn {
            display: none;
            width: 36px;
            height: 36px;
            border-radius: var(--radius-command);
            border: 1px solid var(--border);
            background: #fff;
            color: var(--ink-light);
            font-size: 0.875rem;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .search-icon-btn:hover {
            color: var(--primary-deep);
            border-color: var(--primary);
        }
        .btn-main {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 44px;
            padding: 0 24px;
            background: var(--accent);
            color: #2B1D08;
            font-weight: 600;
            font-size: 0.9375rem;
            border: none;
            border-radius: var(--radius-command);
            transition: all 0.25s ease;
            text-decoration: none;
            cursor: pointer;
            line-height: 1.2;
            white-space: nowrap;
        }
        .btn-main:hover {
            background: #B88237;
            color: #2B1D08;
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(185, 131, 55, 0.25);
        }
        .btn-main:active {
            transform: translateY(0);
            box-shadow: none;
        }
        .btn-sm-nav {
            height: 38px;
            padding: 0 18px;
            font-size: 0.875rem;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }
        .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        .hamburger.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        .mobile-search-bar {
            display: none;
            padding: 12px 16px;
            background: #fff;
            border-bottom: 1px solid var(--border);
        }
        .mobile-search-bar.show {
            display: block;
        }
        .mobile-search-bar input {
            width: 100%;
            height: 40px;
            border: 1px solid var(--border);
            border-radius: var(--radius-command);
            padding: 0 14px;
            font-size: 0.875rem;
            outline: none;
            font-family: inherit;
        }
        .mobile-search-bar input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(59, 126, 161, 0.18);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            right: 0;
            background: #fff;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 12px 24px rgba(38, 59, 79, 0.08);
            z-index: 999;
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu-item {
            display: flex;
            align-items: center;
            height: 52px;
            padding: 0 20px;
            font-size: 1rem;
            color: var(--ink);
            border-bottom: 1px solid var(--border);
            text-decoration: none;
            transition: background 0.2s ease;
        }
        .mobile-menu-item:last-child {
            border-bottom: none;
        }
        .mobile-menu-item:hover {
            background: var(--primary-weak);
            color: var(--primary-deep);
        }
        .mobile-menu-item.active {
            color: var(--primary-deep);
            font-weight: 600;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-nav {
            padding: 26px 0 0;
            font-size: 0.8125rem;
            color: var(--ink-light);
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .breadcrumb-nav a {
            color: var(--ink-light);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        .breadcrumb-nav a:hover {
            color: var(--primary);
        }
        .breadcrumb-nav .sep {
            color: #B8C8D6;
            font-size: 0.75rem;
        }
        .breadcrumb-nav .current {
            color: var(--ink);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            max-width: 400px;
        }

        /* ===== Article Hero ===== */
        .article-hero {
            padding: 40px 0 20px;
        }
        .article-hero .badge {
            display: inline-flex;
            align-items: center;
            background: var(--primary-weak);
            color: var(--primary-deep);
            border-radius: 999px;
            padding: 4px 14px;
            font-size: 0.8125rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        .article-h1 {
            font-size: 2.125rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--ink);
            letter-spacing: -0.01em;
            margin-bottom: 16px;
            max-width: 900px;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 22px;
            font-size: 0.875rem;
            color: var(--ink-light);
            flex-wrap: wrap;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border);
        }
        .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .meta-item i {
            font-size: 0.8125rem;
            color: var(--primary);
        }

        /* ===== Article Body ===== */
        .article-main {
            padding-bottom: 64px;
        }
        .article-content {
            max-width: 820px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 44px 52px 40px;
            margin-top: 28px;
        }
        .article-content p {
            font-size: 1.0625rem;
            line-height: 1.9;
            color: var(--ink);
            margin-bottom: 24px;
        }
        .article-content h2 {
            font-size: 1.375rem;
            font-weight: 700;
            color: var(--ink);
            margin: 36px 0 12px;
            line-height: 1.4;
        }
        .article-content h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--ink);
            margin: 28px 0 10px;
            line-height: 1.4;
        }
        .article-content h4 {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--ink);
            margin: 24px 0 8px;
        }
        .article-content ul,
        .article-content ol {
            margin: 0 0 24px;
            padding: 0;
            list-style: none;
        }
        .article-content ul li {
            position: relative;
            padding-left: 22px;
            margin-bottom: 10px;
            line-height: 1.75;
        }
        .article-content ul li::before {
            content: "▪";
            position: absolute;
            left: 0;
            color: var(--primary);
            font-size: 1rem;
        }
        .article-content ol {
            counter-reset: article-ol;
        }
        .article-content ol li {
            position: relative;
            padding-left: 34px;
            margin-bottom: 10px;
            line-height: 1.75;
            counter-increment: article-ol;
        }
        .article-content ol li::before {
            content: counter(article-ol);
            position: absolute;
            left: 0;
            top: 2px;
            width: 24px;
            height: 24px;
            background: var(--primary-weak);
            color: var(--primary-deep);
            border-radius: 6px;
            font-size: 0.8125rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-weak);
            padding: 20px 24px;
            border-radius: 0 8px 8px 0;
            margin: 24px 0;
            color: var(--ink-light);
            line-height: 1.75;
        }
        .article-content blockquote p:last-child {
            margin-bottom: 0;
        }
        .article-content img {
            border-radius: 12px;
            margin: 24px 0;
            width: 100%;
            height: auto;
            aspect-ratio: 16 / 10;
            object-fit: cover;
        }
        .article-content img+em {
            display: block;
            text-align: center;
            font-size: 0.8125rem;
            color: var(--ink-light);
            margin-top: -20px;
            margin-bottom: 24px;
            font-style: normal;
        }
        .article-content a {
            color: var(--primary);
            border-bottom: 1px solid var(--primary);
            text-decoration: none;
            transition: color 0.2s ease, border-color 0.2s ease;
        }
        .article-content a:hover {
            color: var(--primary-deep);
            border-bottom-color: var(--primary-deep);
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 0.9375rem;
        }
        .article-content table th,
        .article-content table td {
            border: 1px solid var(--border);
            padding: 10px 14px;
            text-align: left;
        }
        .article-content table th {
            background: var(--primary-weak);
            font-weight: 600;
            color: var(--primary-deep);
        }

        /* ===== Tags & Pager ===== */
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 36px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
        }
        .article-tags .badge {
            display: inline-flex;
            align-items: center;
            background: var(--primary-weak);
            color: var(--primary-deep);
            border-radius: 999px;
            padding: 4px 12px;
            font-size: 0.8125rem;
            font-weight: 500;
            text-decoration: none;
            transition: all 0.2s ease;
        }
        .article-tags .badge:hover {
            background: var(--primary);
            color: #fff;
        }
        .article-pager {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            margin-top: 24px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
        }
        .article-pager a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--ink-light);
            font-size: 0.875rem;
            text-decoration: none;
            transition: color 0.2s ease, transform 0.2s ease;
            max-width: 50%;
        }
        .article-pager a:hover {
            color: var(--primary);
        }
        .article-pager .prev:hover {
            transform: translateX(-4px);
        }
        .article-pager .next:hover {
            transform: translateX(4px);
        }

        /* ===== Not Found ===== */
        .not-found {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 80px 40px;
            text-align: center;
            max-width: 760px;
            margin: 28px auto 0;
        }
        .not-found i {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 16px;
            display: block;
        }
        .not-found h2 {
            font-size: 1.5rem;
            color: var(--ink);
            margin-bottom: 12px;
            font-weight: 700;
        }
        .not-found p {
            color: var(--ink-light);
            margin-bottom: 24px;
        }

        /* ===== Related ===== */
        .related-section {
            padding: 64px 0 56px;
            background: var(--bg-page);
            border-top: 1px solid var(--border);
        }
        .section-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
        }
        .section-head h2 {
            font-size: 1.875rem;
            font-weight: 700;
            color: var(--ink);
            letter-spacing: -0.01em;
            margin: 0;
        }
        .link-more {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary-deep);
            font-size: 0.9375rem;
            font-weight: 600;
            text-decoration: none;
            transition: gap 0.2s ease, color 0.2s ease;
        }
        .link-more:hover {
            gap: 12px;
            color: var(--primary);
        }
        .related-card {
            display: block;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            text-decoration: none;
            height: 100%;
            transition: all 0.25s ease;
        }
        .related-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary-weak);
            transform: translateY(-4px);
        }
        .related-card img {
            aspect-ratio: 16 / 9;
            object-fit: cover;
            width: 100%;
        }
        .related-body {
            padding: 24px;
        }
        .related-body h3 {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 8px;
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color 0.2s ease;
        }
        .related-card:hover .related-body h3 {
            color: var(--primary);
        }
        .related-body p {
            font-size: 0.875rem;
            color: var(--ink-light);
            line-height: 1.6;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-date {
            font-size: 0.8125rem;
            color: var(--ink-light);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .related-date i {
            font-size: 0.75rem;
            color: var(--primary);
        }

        /* ===== Article CTA ===== */
        .article-cta {
            padding: 72px 0 80px;
            background: linear-gradient(135deg, var(--primary-weak) 0%, #F0F6FA 60%, #E9F2F7 100%);
            text-align: center;
        }
        .article-cta .container {
            max-width: 720px;
        }
        .article-cta h2 {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .article-cta p {
            color: var(--ink-light);
            font-size: 1rem;
            margin-bottom: 28px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--ink);
            color: rgba(255, 255, 255, 0.85);
            padding: 64px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 40px;
        }
        .footer-brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            text-decoration: none;
            margin-bottom: 16px;
        }
        .footer-brand .brand-mark {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
        }
        .footer-brand .brand-text {
            color: #fff;
        }
        .footer-desc {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 20px;
            max-width: 320px;
            line-height: 1.6;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .social-icon {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.08);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9375rem;
            transition: all 0.2s ease;
            text-decoration: none;
        }
        .social-icon:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .footer-title {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 20px;
        }
        .footer-links,
        .footer-contact {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.875rem;
            text-decoration: none;
            transition: color 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-links a::before {
            content: "";
            width: 4px;
            height: 4px;
            background: var(--accent);
            border-radius: 50%;
            flex-shrink: 0;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 10px;
        }
        .footer-contact li i {
            color: var(--accent);
            font-size: 0.9375rem;
            width: 18px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }
        .copyright {
            font-size: 0.8125rem;
            color: rgba(255, 255, 255, 0.45);
            margin: 0;
        }
        .back-top {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.875rem;
            transition: all 0.2s ease;
            text-decoration: none;
        }
        .back-top:hover {
            background: var(--primary);
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 991px) {
            .container {
                max-width: 100%;
            }
            .nav-links {
                display: none;
            }
            .search-box {
                display: none;
            }
            .search-icon-btn {
                display: inline-flex;
            }
            .hamburger {
                display: flex;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px;
            }
            .article-content {
                padding: 32px 36px;
            }
            .related-card img {
                aspect-ratio: 16 / 10;
            }
        }
        @media (max-width: 767px) {
            .site-header {
                height: 64px;
            }
            .mobile-menu {
                top: 64px;
            }
            .btn-sm-nav {
                display: none;
            }
            .brand-text {
                font-size: 1.125rem;
            }
            .article-hero {
                padding: 28px 0 16px;
            }
            .article-h1 {
                font-size: 1.75rem;
            }
            .article-meta {
                gap: 12px;
                font-size: 0.8125rem;
            }
            .article-content {
                padding: 28px 20px;
                border-radius: 14px;
            }
            .article-content p {
                font-size: 1rem;
                line-height: 1.85;
            }
            .article-content blockquote {
                padding: 16px 18px;
            }
            .article-pager {
                flex-direction: column;
                align-items: flex-start;
            }
            .article-pager a {
                max-width: 100%;
            }
            .related-section {
                padding: 48px 0 40px;
            }
            .section-head {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                margin-bottom: 24px;
            }
            .section-head h2 {
                font-size: 1.5rem;
            }
            .article-cta {
                padding: 56px 0 64px;
            }
            .article-cta h2 {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
            .not-found {
                padding: 60px 24px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .brand-mark {
                width: 32px;
                height: 32px;
                font-size: 0.875rem;
                border-radius: 8px;
            }
            .nav-actions {
                gap: 8px;
            }
            .search-icon-btn {
                width: 32px;
                height: 32px;
            }
            .breadcrumb-nav .current {
                max-width: 200px;
            }
            .article-h1 {
                font-size: 1.5rem;
            }
            .article-content {
                padding: 24px 18px;
            }
            .related-body {
                padding: 18px;
            }
            .related-body h3 {
                font-size: 1rem;
            }
            .article-cta h2 {
                font-size: 1.375rem;
            }
            .btn-main {
                width: auto;
                min-width: 160px;
            }
        }

/* roulang page: category3 */
:root {
  --primary: #3B7EA1;
  --primary-deep: #2C6078;
  --primary-weak: #EAF2F7;
  --accent: #C9934B;
  --accent-deep: #B88237;
  --ink: #263B4F;
  --ink-light: #546E82;
  --bg-page: #F7F9FB;
  --bg-card: #FFFFFF;
  --border: #E3EAF2;
  --shadow-card: 0 4px 20px rgba(38,59,79,0.07);
  --shadow-card-hover: 0 14px 34px rgba(38,59,79,0.12);
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-command: 10px;
  --font-stack: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  background: var(--bg-page);
  color: var(--ink);
  line-height: 1.75;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

button, input {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

.btn-main {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #2A1E0F;
  font-weight: 600;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-command);
  border: none;
  cursor: pointer;
  transition: background 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}

.btn-main:hover {
  background: var(--accent-deep);
  color: #1F150A;
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(201,147,75,0.28);
}

.btn-main:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-main.btn-sm-nav {
  height: 38px;
  padding: 0 18px;
  font-size: 0.9375rem;
  border-radius: 9px;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: var(--primary-deep);
  font-weight: 600;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-command);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.btn-ghost:hover {
  border-color: var(--primary);
  background: var(--primary-weak);
  color: var(--primary-deep);
  transform: translateY(-1px);
}

.btn-ghost:active {
  transform: translateY(0);
}

.badge {
  display: inline-block;
  background: var(--primary-weak);
  color: var(--primary-deep);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.container {
  max-width: 1200px;
  padding-left: 20px;
  padding-right: 20px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(247,249,251,0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1030;
}

.navbar-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

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

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary-weak);
  color: var(--primary-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.0625rem;
  transition: background 0.25s ease, color 0.25s ease;
}

.brand:hover .brand-mark {
  background: var(--primary);
  color: #fff;
}

.brand-text {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary-deep);
  letter-spacing: -0.01em;
}

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

.nav-link {
  position: relative;
  font-size: 0.9375rem;
  color: var(--ink-light);
  font-weight: 500;
  padding: 6px 0;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease;
  border-radius: 2px;
}

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

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

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

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

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

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 200px;
  height: 36px;
  background: #F1F5F9;
  border-radius: var(--radius-command);
  padding: 0 10px 0 12px;
  border: 1px solid transparent;
  transition: width 0.25s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.search-box i {
  font-size: 0.8125rem;
  color: var(--ink-light);
}

.search-box input {
  flex: 1;
  min-width: 0;
  font-size: 0.875rem;
  color: var(--ink);
  background: transparent;
}

.search-box input::placeholder {
  color: #8AA0B2;
}

.search-box input:focus {
  outline: none;
}

.search-box:focus-within {
  width: 260px;
  background: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59,126,161,0.18);
}

.search-kbd {
  font-size: 0.75rem;
  color: var(--ink-light);
  background: #E7EDF3;
  border-radius: 6px;
  padding: 2px 8px;
  border: 1px solid var(--border);
  line-height: 1.4;
  white-space: nowrap;
}

.search-icon-btn {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #F1F5F9;
  color: var(--ink-light);
  align-items: center;
  justify-content: center;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.search-icon-btn:hover {
  background: var(--primary-weak);
  color: var(--primary-deep);
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: #F1F5F9;
  cursor: pointer;
  align-items: center;
  transition: background 0.2s ease;
}

.hamburger:hover {
  background: var(--primary-weak);
}

.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-search-bar {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: #fff;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 8px 20px rgba(38,59,79,0.06);
  z-index: 1029;
}

.mobile-search-bar.show {
  display: block;
}

.mobile-search-bar input {
  width: 100%;
  height: 40px;
  border-radius: var(--radius-command);
  background: #F1F5F9;
  padding: 0 14px;
  font-size: 0.9375rem;
  color: var(--ink);
}

.mobile-search-bar input::placeholder {
  color: #8AA0B2;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  z-index: 1028;
  padding: 10px 20px 32px;
  overflow-y: auto;
}

.mobile-menu.show {
  display: block;
}

.mobile-menu .mobile-nav-item {
  display: block;
  height: 52px;
  line-height: 52px;
  font-size: 1rem;
  color: var(--ink);
  border-bottom: 1px solid var(--border);
  font-weight: 500;
}

.mobile-menu .mobile-nav-item:hover {
  color: var(--primary-deep);
}

.mobile-menu .mobile-nav-item.active {
  color: var(--primary-deep);
  font-weight: 600;
}

/* ---------- Category Hero ---------- */
.category-hero {
  position: relative;
  padding: 150px 0 64px;
  background: linear-gradient(180deg, rgba(247,249,251,0.88) 0%, var(--bg-page) 100%), url('/assets/images/backpic/back-1.webp') no-repeat center top/cover;
  border-bottom: 1px solid var(--border);
}

.category-hero .badge {
  margin-bottom: 16px;
}

.category-hero h1 {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.category-hero .hero-subtitle {
  font-size: 1rem;
  color: var(--ink-light);
  line-height: 1.85;
  max-width: 560px;
  margin-bottom: 28px;
}

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

.hero-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: #fff;
}

.hero-media img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}

.hero-float-badge {
  position: absolute;
  left: 16px;
  bottom: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(6px);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--primary-deep);
  box-shadow: 0 4px 14px rgba(38,59,79,0.12);
}

.hero-float-badge i {
  color: var(--accent);
  font-size: 0.875rem;
}

/* ---------- Stats Section ---------- */
.stats-section {
  padding: 56px 0 24px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.stat-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
  text-align: center;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.stat-item:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
}

.stat-item .stat-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  margin-bottom: 4px;
}

.stat-item .stat-label {
  font-size: 0.9375rem;
  color: var(--ink-light);
}

/* ---------- Function Cards ---------- */
.function-section {
  padding: 56px 0 24px;
}

.section-head {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 40px;
}

.section-head .section-index {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.section-head h2 {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-head .section-sub {
  color: var(--ink-light);
  line-height: 1.75;
}

.function-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px 28px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
  height: 100%;
}

.function-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-5px);
  border-color: var(--primary-weak);
}

.function-num {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(201,147,75,0.12);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 18px;
  letter-spacing: 0.04em;
}

.function-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}

.function-card p {
  font-size: 0.9375rem;
  color: var(--ink-light);
  line-height: 1.75;
  margin-bottom: 16px;
}

.function-card .badge {
  background: var(--primary-weak);
  color: var(--primary-deep);
}

/* ---------- Scene Section ---------- */
.scene-section {
  padding: 64px 0;
}

.scene-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.scene-media img {
  width: 100%;
  aspect-ratio: 16/11;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.scene-media:hover img {
  transform: scale(1.02);
}

.scene-content h2 {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.scene-content .scene-lead {
  color: var(--ink-light);
  margin-bottom: 24px;
}

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

.scene-list li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 18px;
}

.scene-list li::before {
  content: "\f00c";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-weak);
  color: var(--primary);
  font-size: 0.6875rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.scene-list .list-title {
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}

.scene-list .list-desc {
  font-size: 0.9375rem;
  color: var(--ink-light);
}

/* ---------- Process Section ---------- */
.process-section {
  padding: 64px 0;
  background: #fff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.process-step {
  position: relative;
  background: var(--bg-page);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  border: 1px solid var(--border);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

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

.process-step .step-num {
  display: inline-block;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary-deep);
  color: #fff;
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 36px;
  margin-bottom: 14px;
}

.process-step h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.process-step p {
  font-size: 0.9375rem;
  color: var(--ink-light);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ---------- FAQ Section ---------- */
.faq-section {
  padding: 64px 0 24px;
}

.faq-wrapper {
  max-width: 760px;
  margin: 40px auto 0;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

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

.accordion-button {
  width: 100%;
  height: 60px;
  padding: 0 20px;
  background: #fff;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
  border: none;
  transition: color 0.2s ease;
}

.accordion-button:hover {
  color: var(--primary-deep);
}

.accordion-button::after {
  content: "+";
  font-family: var(--font-stack);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform 0.25s ease;
  line-height: 1;
  flex-shrink: 0;
}

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

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

.accordion-body {
  padding: 0 20px 20px;
  color: var(--ink-light);
  line-height: 1.75;
  font-size: 0.9375rem;
}

/* ---------- CTA Section ---------- */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary-weak) 0%, #F3F7FB 60%, #FFF8F0 100%);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: rgba(201,147,75,0.08);
}

.cta-inner {
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-inner h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.cta-inner p {
  color: var(--ink-light);
  max-width: 480px;
  margin: 0 auto 28px;
}

.btn-lg-cta {
  height: 52px;
  padding: 0 36px;
  font-size: 1.0625rem;
  border-radius: 12px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,0.85);
  padding: 56px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-brand .brand-mark {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.footer-brand:hover .brand-mark {
  background: var(--accent);
  color: var(--ink);
}

.footer-brand .brand-text {
  color: #fff;
}

.footer-desc {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(255,255,255,0.7);
  margin-bottom: 18px;
  max-width: 360px;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.social-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9375rem;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.social-icon:hover {
  background: var(--accent);
  color: var(--ink);
  transform: translateY(-2px);
}

.footer-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}

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

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

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #fff;
}

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

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.7);
}

.footer-contact i {
  color: var(--accent);
  font-size: 0.875rem;
  width: 18px;
  text-align: center;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 28px;
}

.footer-bottom .copyright {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0;
}

.back-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.85);
  font-size: 0.875rem;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.back-top:hover {
  background: var(--accent);
  color: var(--ink);
  transform: translateY(-2px);
}

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
  .nav-links {
    display: none;
  }

  .search-box {
    display: none;
  }

  .search-icon-btn {
    display: flex;
  }

  .hamburger {
    display: flex;
  }

  .btn-sm-nav {
    display: none;
  }

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

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

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

@media (max-width: 767.98px) {
  .category-hero {
    padding: 108px 0 40px;
  }

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

  .hero-media {
    margin-top: 24px;
  }

  .function-section, .stats-section, .scene-section, .process-section, .faq-section, .cta-section {
    padding: 48px 0 20px;
  }

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

  .section-head h2 {
    font-size: 1.5rem;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
  }
}

@media (max-width: 575.98px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn-main,
  .hero-actions .btn-ghost {
    width: 100%;
  }

  .cta-inner h2 {
    font-size: 1.625rem;
  }

  .btn-lg-cta {
    width: 100%;
    max-width: 320px;
  }
}

/* roulang page: category2 */
/* ===== Design Variables ===== */
        :root {
            --primary: #3B7EA1;
            --primary-deep: #2C6078;
            --primary-weak: #EAF2F7;
            --accent: #C9934B;
            --accent-deep: #B88237;
            --ink: #263B4F;
            --ink-light: #546E82;
            --bg-page: #F7F9FB;
            --bg-card: #FFFFFF;
            --border: #E3EAF2;
            --shadow-card: 0 4px 20px rgba(38, 59, 79, 0.07);
            --shadow-card-hover: 0 14px 34px rgba(38, 59, 79, 0.12);
            --radius-md: 12px;
            --radius-lg: 18px;
            --radius-command: 10px;
            --font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

        /* ===== Reset / Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            font-size: 1rem;
            line-height: 1.75;
            color: var(--ink);
            background-color: var(--bg-page);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--primary-deep);
            text-decoration: none;
        }

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

        button,
        input {
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
        }

        /* ===== Buttons ===== */
        .btn-main {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 44px;
            padding: 0 24px;
            border: none;
            border-radius: var(--radius-command);
            background: var(--accent);
            color: #2B2414;
            font-weight: 600;
            font-size: 0.9375rem;
            cursor: pointer;
            transition: background 0.25s ease, transform 0.15s ease, box-shadow 0.25s ease;
            line-height: 1;
        }
        .btn-main:hover {
            background: var(--accent-deep);
            color: #2B2414;
            transform: translateY(-1px);
        }
        .btn-main:active {
            transform: translateY(0);
        }
        .btn-main:focus-visible {
            outline: 3px solid rgba(201, 147, 75, 0.4);
            outline-offset: 2px;
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 44px;
            padding: 0 24px;
            border: 1px solid var(--border);
            border-radius: var(--radius-command);
            background: #fff;
            color: var(--primary-deep);
            font-weight: 600;
            font-size: 0.9375rem;
            cursor: pointer;
            transition: background 0.25s ease, border-color 0.25s ease, transform 0.15s ease;
            line-height: 1;
        }
        .btn-ghost:hover {
            border-color: var(--primary);
            background: var(--primary-weak);
            color: var(--primary-deep);
            transform: translateY(-1px);
        }

        .btn-sm-nav {
            height: 38px;
            padding: 0 18px;
            font-size: 0.875rem;
            border-radius: var(--radius-command);
        }

        .btn-lg {
            height: 52px;
            padding: 0 36px;
            font-size: 1.0625rem;
            border-radius: var(--radius-command);
        }

        /* ===== Badge ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary-weak);
            color: var(--primary-deep);
            font-size: 0.8125rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            padding: 4px 14px;
            border-radius: 999px;
            line-height: 1.5;
            border: none;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            width: 100%;
            height: 72px;
            background: rgba(247, 249, 251, 0.75);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
        }

        .navbar-main {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            padding: 0 16px;
            max-width: 1200px;
            margin: 0 auto;
            gap: 16px;
        }

        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .brand-mark {
            width: 36px;
            height: 36px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-weak);
            border-radius: 10px;
            color: var(--primary-deep);
            font-size: 1.05rem;
        }
        .brand-text {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary-deep);
            letter-spacing: -0.01em;
            line-height: 1;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .nav-link {
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--ink-light);
            position: relative;
            padding: 8px 0;
            transition: color 0.2s ease;
            line-height: 1.4;
        }
        .nav-link:hover {
            color: var(--ink);
        }
        .nav-link::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.25s ease;
        }
        .nav-link:hover::after {
            transform: scaleX(1);
        }
        .nav-link.active {
            color: var(--primary-deep);
            font-weight: 600;
        }
        .nav-link.active::after {
            transform: scaleX(1);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            width: 200px;
            height: 36px;
            padding: 0 10px 0 12px;
            background: #F1F5F9;
            border: 1px solid transparent;
            border-radius: var(--radius-command);
            transition: width 0.3s ease, border-color 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
            color: var(--ink-light);
        }
        .search-box:focus-within {
            width: 260px;
            background: #fff;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(59, 126, 161, 0.18);
        }
        .search-box input {
            flex: 1;
            min-width: 0;
            border: none;
            outline: none;
            background: transparent;
            font-size: 0.875rem;
            color: var(--ink);
        }
        .search-box input::placeholder {
            color: #8AA0B2;
        }
        .search-kbd {
            flex-shrink: 0;
            font-size: 0.7rem;
            padding: 1px 6px;
            border: 1px solid var(--border);
            border-radius: 4px;
            background: #fff;
            color: var(--ink-light);
            line-height: 1.4;
        }

        .search-icon-btn {
            display: none;
            width: 36px;
            height: 36px;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--border);
            border-radius: 50%;
            background: #fff;
            color: var(--primary-deep);
            cursor: pointer;
            font-size: 0.875rem;
            transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
        }
        .search-icon-btn:hover {
            background: var(--primary-weak);
            border-color: var(--primary);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 4px;
            width: 38px;
            height: 38px;
            border: 1px solid var(--border);
            border-radius: 10px;
            background: #fff;
            cursor: pointer;
            transition: background 0.2s ease;
            padding: 0;
        }
        .hamburger:hover {
            background: var(--primary-weak);
        }
        .hamburger span {
            display: block;
            width: 18px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }
        .hamburger.open span:nth-child(1) {
            transform: translateY(6px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-6px) rotate(-45deg);
        }

        .mobile-search-bar {
            display: none;
            padding: 0 16px 16px;
            border-bottom: 1px solid var(--border);
            background: #fff;
        }
        .mobile-search-bar.open {
            display: block;
        }
        .mobile-search-bar input {
            width: 100%;
            height: 40px;
            padding: 0 14px;
            border: 1px solid var(--border);
            border-radius: var(--radius-command);
            outline: none;
            font-size: 0.9rem;
            transition: border-color 0.2s ease;
        }
        .mobile-search-bar input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(59, 126, 161, 0.18);
        }

        .mobile-drawer {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            width: 100%;
            height: calc(100vh - 72px);
            background: #fff;
            z-index: 999;
            flex-direction: column;
            padding: 16px;
            overflow-y: auto;
            border-top: 1px solid var(--border);
        }
        .mobile-drawer.open {
            display: flex;
        }
        .mobile-nav-link {
            display: flex;
            align-items: center;
            min-height: 52px;
            padding: 0 16px;
            font-size: 1rem;
            color: var(--ink);
            border-bottom: 1px solid var(--border);
            font-weight: 500;
            transition: background 0.2s ease, color 0.2s ease;
        }
        .mobile-nav-link:hover {
            background: var(--primary-weak);
            color: var(--primary-deep);
        }
        .mobile-nav-link.active {
            color: var(--primary-deep);
            font-weight: 600;
            background: var(--primary-weak);
        }

        /* ===== Category Hero ===== */
        .category-hero {
            background: linear-gradient(90deg, rgba(247, 249, 251, 0.95) 0%, rgba(247, 249, 251, 0.82) 45%, rgba(247, 249, 251, 0.55) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            border-bottom: 1px solid var(--border);
            padding: 72px 0 56px;
            position: relative;
        }
        .category-hero .hero-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 48px;
        }
        .category-hero .hero-text {
            max-width: 640px;
        }
        .category-hero .hero-badge {
            margin-bottom: 16px;
        }
        .category-hero h1 {
            font-size: clamp(2rem, 4vw, 2.5rem);
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: -0.01em;
            color: var(--ink);
            margin-bottom: 16px;
        }
        .category-hero .hero-desc {
            font-size: 1rem;
            color: var(--ink-light);
            line-height: 1.8;
            margin-bottom: 28px;
            max-width: 560px;
        }
        .category-hero .hero-actions {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .category-hero .hero-visual {
            flex-shrink: 0;
            width: 320px;
            display: block;
        }
        .category-hero .hero-visual img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
        }

        /* ===== Solution Body (Sidebar + Content) ===== */
        .solution-section {
            padding: 72px 0 56px;
        }
        .solution-layout {
            display: grid;
            grid-template-columns: 190px 1fr;
            gap: 48px;
        }

        .solution-sidebar {
            position: sticky;
            top: 96px;
            align-self: start;
            border-left: 1px solid var(--border);
            padding-left: 20px;
        }
        .sidebar-title {
            font-size: 0.8125rem;
            font-weight: 700;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            color: var(--ink-light);
            margin-bottom: 16px;
        }
        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sidebar-nav a {
            display: block;
            padding: 8px 12px;
            font-size: 0.875rem;
            color: var(--ink-light);
            border-radius: 8px;
            transition: background 0.2s ease, color 0.2s ease;
            line-height: 1.5;
        }
        .sidebar-nav a:hover {
            background: var(--primary-weak);
            color: var(--primary-deep);
        }
        .sidebar-nav a.active {
            background: var(--primary-weak);
            color: var(--primary-deep);
            font-weight: 600;
        }

        .solution-content {
            min-width: 0;
        }

        .content-chapter {
            margin-bottom: 56px;
        }
        .content-chapter:last-of-type {
            margin-bottom: 0;
        }
        .chapter-head {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 16px;
        }
        .chapter-num {
            flex-shrink: 0;
            font-size: 0.8125rem;
            font-weight: 700;
            color: var(--accent);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 2px 8px;
            line-height: 1.5;
        }
        .chapter-title {
            font-size: 1.625rem;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.3;
            margin: 0;
        }
        .chapter-lead {
            font-size: 1rem;
            color: var(--ink-light);
            line-height: 1.8;
            margin-bottom: 24px;
            max-width: 680px;
        }
        .check-list {
            list-style: none;
            padding: 0;
            margin: 0 0 24px 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .check-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.9375rem;
            color: var(--ink);
            line-height: 1.65;
        }
        .check-list li i {
            color: var(--primary);
            font-size: 0.875rem;
            margin-top: 5px;
            flex-shrink: 0;
        }

        .chapter-img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            width: 100%;
            max-width: 420px;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            margin-top: 8px;
        }

        /* Process steps */
        .process-steps {
            list-style: none;
            padding: 0;
            margin: 24px 0 0 0;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .process-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            transition: box-shadow 0.25s ease, border-color 0.25s ease;
        }
        .process-item:hover {
            box-shadow: var(--shadow-card);
            border-color: var(--primary-weak);
        }
        .process-num {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--primary-weak);
            color: var(--primary-deep);
            font-weight: 700;
            font-size: 0.875rem;
            margin-top: 4px;
        }
        .process-body h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--ink);
            margin: 0 0 4px 0;
            line-height: 1.4;
        }
        .process-body p {
            font-size: 0.875rem;
            color: var(--ink-light);
            line-height: 1.65;
            margin: 0;
        }

        /* ===== Stats Band ===== */
        .stats-band {
            background: var(--primary-deep);
            background-image: linear-gradient(135deg, rgba(38, 59, 79, 0.2) 0%, rgba(38, 59, 79, 0) 45%), url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            padding: 64px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .stat-item {
            text-align: center;
            padding: 0 16px;
            border-right: 1px solid rgba(255, 255, 255, 0.18);
        }
        .stat-item:last-child {
            border-right: none;
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
            letter-spacing: -0.01em;
            margin-bottom: 8px;
        }
        .stat-label {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.5;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 72px 0 56px;
        }
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }
        .section-title {
            font-size: 1.875rem;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.3;
            letter-spacing: -0.01em;
            margin-bottom: 8px;
        }
        .section-sub {
            font-size: 0.9375rem;
            color: var(--ink-light);
            margin-bottom: 32px;
        }

        .faq-accordion .accordion-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-md) !important;
            margin-bottom: 12px;
            overflow: hidden;
            background: #fff;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .faq-accordion .accordion-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-card);
        }
        .faq-accordion .accordion-button {
            background: #fff;
            color: var(--ink);
            font-size: 1rem;
            font-weight: 600;
            padding: 18px 24px;
            box-shadow: none;
            line-height: 1.5;
            border-radius: var(--radius-md);
        }
        .faq-accordion .accordion-button::after {
            background-image: none;
            content: "\2b";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            font-size: 1.1rem;
            color: var(--primary-deep);
            transform: none;
            transition: transform 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 1.1rem;
            height: 1.1rem;
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            background: var(--primary-weak);
            color: var(--primary-deep);
        }
        .faq-accordion .accordion-button:not(.collapsed)::after {
            content: "\f00d";
            transform: none;
        }
        .faq-accordion .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(59, 126, 161, 0.18);
            outline: none;
        }
        .faq-accordion .accordion-body {
            background: #fff;
            padding: 0 24px 20px;
            color: var(--ink-light);
            line-height: 1.75;
            font-size: 0.9375rem;
            border-top: 1px solid var(--primary-weak);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(120deg, var(--primary-weak) 0%, rgba(247, 249, 251, 0.9) 50%), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
            padding: 72px 0;
            border-top: 1px solid var(--border);
        }
        .cta-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            padding: 48px;
            text-align: center;
            max-width: 780px;
            margin: 0 auto;
        }
        .cta-card .section-title {
            margin-bottom: 12px;
        }
        .cta-card p {
            color: var(--ink-light);
            font-size: 1rem;
            margin-bottom: 28px;
        }
        .cta-form {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
            max-width: 560px;
            margin: 0 auto;
        }
        .cta-form .form-control {
            height: 44px;
            border-radius: var(--radius-command);
            border: 1px solid #D4DEE8;
            font-size: 0.9rem;
            padding: 0 16px;
            background: #fff;
            width: 200px;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }
        .cta-form .form-control::placeholder {
            color: #8AA0B2;
        }
        .cta-form .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(59, 126, 161, 0.18);
            outline: none;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--ink);
            color: rgba(255, 255, 255, 0.85);
            padding: 56px 0 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.4fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .footer-brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
            color: #fff;
        }
        .footer-brand .brand-mark {
            background: rgba(255, 255, 255, 0.12);
            color: var(--accent);
        }
        .footer-brand .brand-text {
            color: #fff;
        }
        .footer-desc {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.7;
            margin-bottom: 20px;
            max-width: 320px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .social-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.9375rem;
            transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
        }
        .social-icon:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }
        .footer-title {
            font-size: 0.9375rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.875rem;
            transition: color 0.2s ease;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-contact {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.6;
        }
        .footer-contact li i {
            color: var(--accent);
            width: 16px;
            text-align: center;
            margin-top: 4px;
            font-size: 0.875rem;
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
        }
        .copyright {
            font-size: 0.8125rem;
            color: rgba(255, 255, 255, 0.55);
            margin: 0;
        }
        .back-top {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.875rem;
            transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
        }
        .back-top:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 991.98px) {
            .nav-links {
                display: none;
            }
            .search-box {
                display: none;
            }
            .search-icon-btn {
                display: inline-flex;
            }
            .hamburger {
                display: flex;
            }
            .category-hero .hero-visual {
                display: none;
            }
            .solution-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .solution-sidebar {
                position: static;
                top: auto;
                border-left: none;
                border-bottom: 1px solid var(--border);
                padding: 0 0 24px 0;
                margin-bottom: 8px;
            }
            .sidebar-nav {
                flex-direction: row;
                flex-wrap: wrap;
                gap: 8px;
            }
            .sidebar-nav a {
                padding: 6px 14px;
                border: 1px solid var(--border);
                border-radius: 999px;
                background: #fff;
            }
            .sidebar-nav a.active {
                background: var(--primary-weak);
                border-color: var(--primary);
            }
            .sidebar-title {
                margin-bottom: 10px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                row-gap: 32px;
            }
            .stat-item:nth-child(2) {
                border-right: none;
            }
            .stat-item:nth-child(n+3) {
                border-top: 1px solid rgba(255, 255, 255, 0.12);
                padding-top: 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 767.98px) {
            .category-hero {
                padding: 48px 0 40px;
            }
            .category-hero h1 {
                font-size: clamp(1.75rem, 6vw, 2.1rem);
            }
            .solution-section,
            .faq-section {
                padding: 56px 0 40px;
            }
            .content-chapter {
                margin-bottom: 40px;
            }
            .chapter-title {
                font-size: 1.375rem;
            }
            .cta-section {
                padding: 56px 0;
            }
            .cta-card {
                padding: 32px 20px;
            }
            .cta-form {
                flex-direction: column;
                align-items: center;
            }
            .cta-form .form-control {
                width: 100%;
                max-width: 380px;
            }
            .cta-form .btn-main {
                width: 100%;
                max-width: 380px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 12px;
            }
            .stats-band {
                padding: 48px 0;
            }
            .stat-number {
                font-size: 2rem;
            }
        }

        @media (max-width: 575.98px) {
            .navbar-main {
                padding: 0 16px;
            }
            .btn-sm-nav {
                display: none !important;
            }
            .brand-text {
                font-size: 1.125rem;
            }
            .brand-mark {
                width: 32px;
                height: 32px;
                font-size: 0.9375rem;
                border-radius: 8px;
            }
            .category-hero .hero-actions {
                flex-direction: row;
            }
            .category-hero .hero-actions .btn-main,
            .category-hero .hero-actions .btn-ghost {
                flex: 1;
                min-width: 140px;
                padding: 0 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .stat-item {
                padding: 0 8px;
            }
        }