/* roulang page: index */
:root {
  --bg-deep: #0D1117;
  --bg-surface: #161C24;
  --bg-soft: #F6F5F2;
  --color-primary: #FF4D00;
  --color-primary-hover: #FF6A33;
  --color-primary-active: #E03E00;
  --color-primary-glow: rgba(255,77,0,0.32);
  --color-accent: #00D4C6;
  --color-gold: #FFB800;
  --text-main: #EEF0F2;
  --text-muted: #9AA5B1;
  --text-dark: #1A202C;
  --line-dark: rgba(255,255,255,0.12);
  --line-light: rgba(0,0,0,0.08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  background: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; transition: color 0.2s ease; }
img { max-width: 100%; display: block; }
button, input, textarea { font-family: inherit; }

.container-custom {
  max-width: 80rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section-label {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 600;
}
.section-label::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 1px;
  background: var(--color-primary);
  margin-right: 8px;
}

.btn-primary {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  border-radius: 6px;
  padding: 0.9rem 1.8rem;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 16px var(--color-primary-glow);
  transition: all 0.2s ease;
  text-align: center;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
}
.btn-primary:active {
  background: var(--color-primary-active);
  transform: translateY(0);
}

.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  padding: 0.9rem 1.8rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}
.btn-outline:hover {
  background: rgba(255,77,0,0.08);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13,17,23,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.site-header.scrolled {
  border-bottom-color: var(--line-dark);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--text-main);
}
.logo-badge {
  display: inline-block;
  background: var(--color-accent);
  color: var(--bg-deep);
  font-size: 0.6rem;
  font-weight: 700;
  border-radius: 4px;
  padding: 2px 5px;
  vertical-align: 3px;
  margin-left: 4px;
  letter-spacing: 0.05em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-link {
  position: relative;
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
  padding: 6px 0;
  transition: color 0.2s ease;
}
.nav-link:hover {
  color: var(--text-main);
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.25s ease;
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}
.nav-link.active {
  color: var(--text-main);
}
.nav-link.active::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 50%;
  vertical-align: 2px;
  margin-right: 4px;
}
.header-cta {
  display: flex;
  align-items: center;
  gap: 10px;
}
.header-cta .btn-primary {
  padding: 0.6rem 1.3rem;
  font-size: 0.9rem;
}
.header-cta-btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  border-radius: 6px;
  padding: 0.6rem 1.2rem;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: 0 2px 12px rgba(255,77,0,0.25);
  transition: all 0.2s ease;
}
.header-cta-btn:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}
.header-phone {
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 6px;
  align-items: center;
  justify-content: center;
  position: relative;
}
.mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-main);
  margin: 3px auto;
  transition: all 0.3s ease;
}
.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--bg-deep);
  border-bottom: 1px solid var(--line-dark);
  padding: 1rem 1.5rem 1.5rem;
  z-index: 99;
  box-shadow: 0 12px 24px rgba(0,0,0,0.4);
}
.mobile-menu.open { display: block; }
.mobile-menu .nav-links {
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}
.mobile-menu .nav-link {
  font-size: 1.1rem;
  padding: 0.6rem 0;
  display: block;
  width: 100%;
}
.mobile-menu .btn-primary {
  margin-top: 1rem;
  width: 100%;
  text-align: center;
}

/* Hero */
.hero-section {
  position: relative;
  padding: 160px 0 100px;
  background-image: linear-gradient(to right, rgba(13,17,23,0.93), rgba(13,17,23,0.65)), url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  min-height: 680px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 280px;
  background: var(--color-primary);
  transform: skewY(-12deg);
  opacity: 0.7;
}
.hero-section::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 40%;
  height: 2px;
  background: linear-gradient(-90deg, var(--color-primary), transparent);
}
.hero-content { max-width: 680px; position: relative; z-index: 2; }
.hero-tag {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  font-weight: 600;
  border: 1px solid rgba(0,212,198,0.3);
  border-radius: 4px;
  padding: 4px 10px;
  margin-bottom: 24px;
}
.hero-title {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 18px;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 520px;
}
.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-stats {
  position: absolute;
  right: 0;
  bottom: 0;
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 24px;
  padding: 24px 32px;
  background: rgba(13,17,23,0.75);
  backdrop-filter: blur(8px);
  border-radius: 12px 0 0 0;
  border-top: 1px solid var(--line-dark);
  border-left: 1px solid var(--line-dark);
  z-index: 2;
}
.hero-stat-item { text-align: center; padding: 4px 8px; }
.hero-stat-num {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--text-main);
  font-feature-settings: "tnum";
  line-height: 1.2;
}
.hero-stat-num em { font-style: normal; color: var(--color-primary); font-size: 1.2rem; }
.hero-stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
  white-space: nowrap;
}

/* Section base */
.section-padding { padding: 90px 0; }
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 50px;
  flex-wrap: wrap;
  gap: 16px;
}
.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 12px;
  letter-spacing: -0.01em;
  color: var(--text-main);
  line-height: 1.3;
}
.section-title-light { color: var(--text-dark); }
.section-link {
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 600;
}
.section-link:hover { color: var(--color-primary-hover); }

/* Services */
.services-section { background: var(--bg-deep); }
.service-card {
  background: var(--bg-surface);
  border: 1px solid var(--line-dark);
  border-radius: 12px;
  padding: 28px;
  position: relative;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}
.service-card:hover {
  border-color: rgba(255,77,0,0.6);
  box-shadow: 0 12px 32px rgba(0,0,0,0.6);
}
.service-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--color-primary);
  opacity: 0.8;
}
.service-card-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 20px;
}
.service-num {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  font-feature-settings: "tnum";
  letter-spacing: 0.06em;
}
.service-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 8px;
  margin-bottom: 10px;
  color: var(--text-main);
}
.service-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.service-cta-card {
  background: linear-gradient(135deg, rgba(255,77,0,0.15), rgba(13,17,23,0.8)), var(--bg-surface);
  border: 1px solid rgba(255,77,0,0.25);
  border-radius: 12px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
}
.service-cta-card p {
  font-size: 1rem;
  color: var(--text-main);
  font-weight: 600;
}
.service-cta-card a {
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 600;
}
.service-cta-card a:hover { color: var(--color-primary-hover); }

/* Stats */
.stats-section {
  background: var(--bg-deep);
  position: relative;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}
.stats-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 22px 22px;
  pointer-events: none;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
  z-index: 1;
}
.stat-item {
  padding: 40px 32px;
  text-align: left;
  position: relative;
}
.stat-item + .stat-item { border-left: 1px solid var(--line-dark); }
.stat-number {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.1;
  font-feature-settings: "tnum";
  color: var(--text-main);
}
.stat-number sup { font-size: 1rem; color: var(--color-primary); top: -1em; }
.stat-bar {
  height: 4px;
  width: 100%;
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
  margin: 16px 0 12px;
  overflow: hidden;
}
.stat-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 2px;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Cases */
.cases-section {
  background: var(--bg-soft);
  transition: background 0.3s ease;
}
.case-card {
  background: #fff;
  border: 1px solid var(--line-light);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}
.case-card:hover {
  box-shadow: 0 12px 32px rgba(0,0,0,0.1);
  border-color: rgba(255,77,0,0.4);
}
.case-card-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}
.case-card-lg .case-card-img { height: 320px; }
.case-card-body { padding: 24px; }
.case-tag {
  display: inline-block;
  background: rgba(255,77,0,0.1);
  color: var(--color-primary);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 20px;
  margin-bottom: 12px;
}
.case-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}
.case-card p {
  font-size: 0.9rem;
  color: #6B7280;
  line-height: 1.7;
  margin-bottom: 12px;
}
.case-link {
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
}
.case-link:hover { color: var(--color-primary-hover); }

/* Solution */
.solution-section { background: var(--bg-deep); }
.solution-left h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}
.solution-left p {
  color: var(--text-muted);
  margin-bottom: 24px;
  max-width: 420px;
}
.solution-list { list-style: none; margin: 0; padding: 0; }
.solution-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  color: var(--text-main);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--line-dark);
}
.solution-list li:last-child { border-bottom: none; }
.solution-dot {
  width: 10px;
  height: 10px;
  background: var(--color-primary);
  flex-shrink: 0;
}
.solution-timeline {
  position: relative;
  padding-left: 32px;
  list-style: none;
  margin: 0;
}
.solution-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line-dark);
}
.solution-timeline li {
  position: relative;
  padding-bottom: 32px;
}
.solution-timeline li:last-child { padding-bottom: 0; }
.solution-timeline li::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(255,77,0,0.15);
}
.timeline-step {
  font-size: 0.7rem;
  color: var(--color-accent);
  font-weight: 700;
  letter-spacing: 0.08em;
}
.timeline-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2px;
}
.timeline-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}
.solution-cta {
  text-align: center;
  margin-top: 60px;
}

/* FAQ */
.faq-section {
  background: var(--bg-soft);
}
.faq-left h2 {
  color: var(--text-dark);
}
.faq-left p {
  color: #6B7280;
  margin: 16px 0 24px;
}
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--line-light);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.faq-item.active {
  border-color: rgba(255,77,0,0.4);
  box-shadow: 0 4px 16px rgba(0,0,0,0.05);
}
.faq-question {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  cursor: pointer;
  user-select: none;
}
.faq-num {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  font-feature-settings: "tnum";
}
.faq-q-text {
  flex: 1;
  font-weight: 600;
  color: var(--text-dark);
  font-size: 0.95rem;
}
.faq-toggle {
  width: 24px;
  height: 24px;
  position: relative;
  flex-shrink: 0;
}
.faq-toggle::before,
.faq-toggle::after {
  content: "";
  position: absolute;
  background: var(--color-primary);
  transition: transform 0.3s ease;
}
.faq-toggle::before {
  width: 14px;
  height: 2px;
  top: 11px;
  left: 5px;
}
.faq-toggle::after {
  width: 2px;
  height: 14px;
  top: 5px;
  left: 11px;
}
.faq-item.active .faq-toggle::after {
  transform: scaleY(0);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 22px 20px 62px;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.8;
  border-left: 2px solid var(--color-primary);
  margin-left: 22px;
}

/* Contact */
.contact-section {
  background: var(--bg-deep);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}
.contact-form-wrap h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}
.contact-form-wrap > p {
  color: var(--text-muted);
  margin-bottom: 28px;
  font-size: 0.9rem;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.form-input {
  width: 100%;
  height: 44px;
  background: rgba(13,17,23,0.5);
  border: 1px solid var(--line-dark);
  border-radius: 6px;
  padding: 0 14px;
  color: var(--text-main);
  font-size: 0.9rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255,77,0,0.2);
}
textarea.form-input {
  height: 100px;
  padding: 12px 14px;
  resize: vertical;
}
.form-input::placeholder { color: #6B7280; }
.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.contact-card {
  background: var(--bg-surface);
  border: 1px solid var(--line-dark);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.contact-icon {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: rgba(255,184,0,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--color-gold);
  flex-shrink: 0;
}
.contact-card h4 {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 2px;
}
.contact-card p {
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 500;
}

/* News */
.news-section { background: var(--bg-deep); }
.news-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
}
.news-feature {
  background: var(--bg-surface);
  border: 1px solid var(--line-dark);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.news-feature:hover {
  border-color: rgba(255,77,0,0.5);
  box-shadow: 0 12px 32px rgba(0,0,0,0.5);
}
.news-feature img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}
.news-feature-body { padding: 24px; }
.news-meta {
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.news-cat {
  color: var(--color-accent);
  font-weight: 600;
  background: rgba(0,212,198,0.08);
  padding: 2px 8px;
  border-radius: 4px;
}
.news-feature h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.4;
}
.news-feature h3 a:hover { color: var(--color-primary); }
.news-feature p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 16px;
}
.news-readmore {
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
}
.news-readmore:hover { color: var(--color-primary-hover); }
.news-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.news-list-item {
  background: var(--bg-surface);
  border: 1px solid var(--line-dark);
  border-radius: 12px;
  padding: 20px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.news-list-item:hover {
  border-color: rgba(255,77,0,0.4);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.news-list-item h4 {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
  line-height: 1.4;
}
.news-list-item h4 a:hover { color: var(--color-primary); }
.news-list-item p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 10px;
}
.news-list-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.news-empty {
  border: 1px dashed var(--line-dark);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  background: #0A0D12;
  padding: 48px 0 0;
  border-top: 1px solid var(--line-dark);
}
.footer-top-line {
  width: 120px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  margin-bottom: 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}
.footer-logo .logo-badge {
  font-size: 0.6rem;
  padding: 2px 5px;
  border-radius: 4px;
  background: var(--color-accent);
  color: var(--bg-deep);
}
.footer-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 280px;
}
.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}
.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-col li { margin-bottom: 10px; }
.footer-col a {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color 0.2s ease;
}
.footer-col a:hover { color: var(--color-primary); }
.footer-contact p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 8px;
}
.footer-bottom {
  border-top: 1px solid var(--line-dark);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-copy {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.footer-icp {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: #2c3644; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

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

/* Responsive */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.2rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(odd) { border-left: none; }
  .stat-item:nth-child(3) { border-left: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .header-cta { display: none; }
  .mobile-toggle { display: flex; }
  .section-padding { padding: 60px 0; }
  .hero-section { padding: 120px 0 80px; min-height: auto; }
  .hero-title { font-size: 1.8rem; }
  .hero-stats {
    position: relative;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    padding: 16px;
    margin-top: 32px;
    border-radius: 12px;
    border: 1px solid var(--line-dark);
    width: 100%;
  }
  .hero-stat-num { font-size: 1.4rem; }
  .stat-number { font-size: 2.2rem; }
  .section-title { font-size: 1.6rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; } }
@media (max-width: 640px) {
  .container-custom { padding-left: 1rem; padding-right: 1rem; }
  .hero-title { font-size: 1.5rem; }
  .hero-buttons { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; text-align: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { padding: 24px 16px; }
  .stat-number { font-size: 2rem; } }

/* roulang page: category1 */
:root {
            --bg-deep: #0D1117;
            --bg-surface: #161C24;
            --bg-soft: #F6F5F2;
            --color-primary: #FF4D00;
            --color-primary-hover: #FF6A33;
            --color-primary-active: #E03E00;
            --color-primary-glow: rgba(255, 77, 0, 0.32);
            --color-accent: #00D4C6;
            --color-gold: #FFB800;
            --text-main: #EEF0F2;
            --text-muted: #9AA5B1;
            --text-dark: #1A202C;
            --line-dark: rgba(255, 255, 255, 0.12);
            --line-light: rgba(0, 0, 0, 0.08);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
            background: var(--bg-deep);
            color: var(--text-main);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        button {
            font-family: inherit;
            cursor: pointer;
        }
        input,
        textarea,
        select {
            font-family: inherit;
        }
        .container-custom {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: rgba(13, 17, 23, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid transparent;
            transition: border-color .3s ease, box-shadow .3s ease;
        }
        .site-header.scrolled {
            border-bottom: 1px solid var(--line-dark);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .site-logo {
            display: inline-flex;
            align-items: center;
            font-size: 1.4rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--text-main);
            line-height: 1.2;
            flex-shrink: 0;
        }
        .logo-badge {
            font-size: 0.6rem;
            font-weight: 600;
            color: var(--color-accent);
            background: rgba(0, 212, 198, 0.12);
            border: 1px solid rgba(0, 212, 198, 0.3);
            padding: 1px 6px;
            border-radius: 999px;
            margin-left: 8px;
            letter-spacing: 0.08em;
            transform: translateY(-4px);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
        }
        .nav-link {
            position: relative;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            padding: 6px 2px;
            transition: color .2s ease;
            white-space: nowrap;
        }
        .nav-link::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 0;
            height: 2px;
            background: var(--color-primary);
            transition: width .2s ease;
        }
        .nav-link:hover {
            color: #fff;
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active {
            color: #fff;
            font-weight: 600;
        }
        .nav-link.active::after {
            width: 100%;
            background: var(--color-primary);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .btn-nav {
            padding: 0.6rem 1.2rem;
            font-size: 0.9rem;
        }
        .menu-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 40px;
            height: 40px;
            background: transparent;
            border: none;
            padding: 8px;
            border-radius: 6px;
        }
        .menu-toggle span {
            display: block;
            height: 2px;
            border-radius: 2px;
            background: var(--text-main);
            transition: transform .3s ease, opacity .3s ease;
        }
        .menu-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .menu-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .menu-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        .mobile-menu {
            display: none;
            background: var(--bg-deep);
            border-top: 1px solid var(--line-dark);
            padding: 20px 24px 28px;
            flex-direction: column;
            gap: 6px;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-link {
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--text-main);
            padding: 12px 0;
            border-bottom: 1px solid var(--line-dark);
        }
        .mobile-link.active {
            color: var(--color-primary);
        }
        .mobile-cta {
            margin-top: 16px;
            text-align: center;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--color-primary);
            color: #fff;
            font-weight: 600;
            border-radius: 6px;
            padding: 0.9rem 1.8rem;
            font-size: 0.95rem;
            border: none;
            box-shadow: 0 4px 16px var(--color-primary-glow);
            transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
            line-height: 1.3;
            text-align: center;
        }
        .btn-primary:hover {
            background: var(--color-primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 24px var(--color-primary-glow);
        }
        .btn-primary:active {
            background: var(--color-primary-active);
            transform: translateY(0);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: var(--color-primary);
            font-weight: 600;
            border-radius: 6px;
            padding: 0.9rem 1.8rem;
            font-size: 0.95rem;
            border: 1px solid var(--color-primary);
            transition: background .2s ease, transform .2s ease, border-color .2s ease;
            line-height: 1.3;
            text-align: center;
        }
        .btn-outline:hover {
            background: rgba(255, 77, 0, 0.08);
            border-color: var(--color-primary-hover);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }

        .category-hero {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            background-size: cover;
            background-position: center;
            padding: 140px 0 80px;
            overflow: hidden;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(100deg, rgba(13, 17, 23, 0.97) 40%, rgba(13, 17, 23, 0.72) 70%, rgba(13, 17, 23, 0.55) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.18em;
            color: var(--color-primary);
            text-transform: uppercase;
            margin-bottom: 18px;
        }
        .hero-tag::before {
            content: "";
            width: 32px;
            height: 2px;
            background: var(--color-primary);
            display: inline-block;
        }
        .hero-title {
            font-size: clamp(2.5rem, 5vw, 3.2rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            color: #fff;
            margin: 0 0 14px;
            line-height: 1.2;
        }
        .hero-sub {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 560px;
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 48px;
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 36px;
            border-top: 1px solid var(--line-dark);
            padding-top: 24px;
            max-width: 520px;
        }
        .stat-item {
            display: flex;
            flex-direction: column;
        }
        .stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-main);
            font-feature-settings: "tnum";
            line-height: 1.2;
        }
        .stat-label {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .section {
            padding: 80px 0;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.18em;
            color: var(--color-primary);
            text-transform: uppercase;
            margin-bottom: 10px;
        }
        .section-tag::before {
            content: "";
            width: 24px;
            height: 2px;
            background: var(--color-primary);
            display: inline-block;
        }
        .section-title {
            font-size: clamp(1.75rem, 3vw, 2.25rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            margin: 0 0 16px;
            line-height: 1.3;
        }
        .section-desc {
            color: var(--text-muted);
            font-size: 0.95rem;
            max-width: 640px;
            margin-bottom: 40px;
        }

        .intro-section {
            padding: 60px 0 20px;
        }
        .intro-text {
            max-width: 860px;
            font-size: 1.02rem;
            color: var(--text-main);
            line-height: 1.85;
            border-left: 3px solid var(--color-primary);
            padding-left: 24px;
        }

        .cards-section {
            padding: 60px 0 80px;
        }
        .spotlight-card {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            background: var(--bg-surface);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--line-dark);
            margin-bottom: 32px;
            transition: border-color .3s ease, box-shadow .3s ease;
        }
        .spotlight-card:hover {
            border-color: rgba(255, 77, 0, 0.6);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6);
        }
        .spotlight-img {
            overflow: hidden;
            aspect-ratio: 16/9;
        }
        .spotlight-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        .spotlight-card:hover .spotlight-img img {
            transform: scale(1.02);
        }
        .spotlight-body {
            padding: 28px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            gap: 12px;
        }
        .card-tag {
            display: inline-flex;
            align-items: center;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            color: var(--color-accent);
            background: rgba(0, 212, 198, 0.1);
            border: 1px solid rgba(0, 212, 198, 0.25);
            padding: 3px 10px;
            border-radius: 999px;
            width: fit-content;
        }
        .spotlight-body h3 {
            font-size: 1.35rem;
            font-weight: 700;
            margin: 0;
            line-height: 1.4;
            color: var(--text-main);
        }
        .spotlight-body p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin: 0;
            line-height: 1.7;
        }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-primary);
            transition: gap .2s ease;
        }
        .card-link:hover {
            gap: 8px;
        }

        .offset-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .offset-card {
            background: var(--bg-surface);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--line-dark);
            transition: border-color .3s ease, box-shadow .3s ease;
        }
        .offset-card:hover {
            border-color: rgba(255, 77, 0, 0.6);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6);
        }
        .offset-card .offset-img {
            aspect-ratio: 16/9;
            overflow: hidden;
        }
        .offset-card .offset-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        .offset-card:hover .offset-img img {
            transform: scale(1.02);
        }
        .offset-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .offset-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin: 0;
            color: var(--text-main);
            line-height: 1.4;
        }
        .offset-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin: 0;
            line-height: 1.7;
        }
        .offset-top {
            transform: translateY(-8px);
        }
        .offset-bottom {
            transform: translateY(8px);
        }

        .features-section {
            position: relative;
            background: var(--bg-deep);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .feature-card {
            background: var(--bg-surface);
            border: 1px solid var(--line-dark);
            border-radius: 12px;
            padding: 28px 22px;
            position: relative;
            transition: border-color .3s ease, box-shadow .3s ease;
        }
        .feature-card::after {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 0;
            height: 0;
            border-top: 24px solid var(--color-primary);
            border-right: 24px solid transparent;
            opacity: 0;
            transition: opacity .3s ease;
        }
        .feature-card:hover {
            border-color: rgba(255, 77, 0, 0.6);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6);
        }
        .feature-card:hover::after {
            opacity: 1;
        }
        .feature-num {
            display: block;
            font-size: 0.85rem;
            font-weight: 800;
            color: var(--color-primary);
            font-feature-settings: "tnum";
            margin-bottom: 16px;
            letter-spacing: 0.05em;
        }
        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-main);
            margin: 0 0 10px;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.7;
        }
        .feature-card::before {
            content: "";
            position: absolute;
            bottom: 0;
            left: 22px;
            width: 36px;
            height: 3px;
            background: var(--color-primary);
            border-radius: 2px;
        }

        .scenarios-section {
            background: var(--bg-soft);
            color: var(--text-dark);
        }
        .scenarios-section .section-title {
            color: var(--text-dark);
        }
        .scenarios-section .section-desc {
            color: #5A6572;
        }
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .scenario-card {
            background: #fff;
            border: 1px solid var(--line-light);
            border-radius: 12px;
            padding: 30px 26px;
            transition: border-color .3s ease, box-shadow .3s ease;
            position: relative;
        }
        .scenario-card:hover {
            border-color: rgba(255, 77, 0, 0.45);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
        }
        .scenario-num {
            display: block;
            font-size: 0.8rem;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: 0.08em;
            margin-bottom: 18px;
            font-feature-settings: "tnum";
        }
        .scenario-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-dark);
            margin: 0 0 12px;
        }
        .scenario-card p {
            font-size: 0.92rem;
            color: #5A6572;
            margin: 0;
            line-height: 1.75;
        }

        .process-section {
            background: var(--bg-deep);
            padding: 90px 0;
        }
        .process-wrap {
            display: grid;
            grid-template-columns: 0.9fr 1.1fr;
            gap: 60px;
            align-items: start;
        }
        .process-points {
            list-style: none;
            padding: 0;
            margin: 24px 0 30px;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .process-points li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 0.95rem;
            color: var(--text-main);
        }
        .process-points li::before {
            content: "";
            flex-shrink: 0;
            width: 10px;
            height: 10px;
            background: var(--color-primary);
            margin-top: 7px;
        }
        .timeline {
            position: relative;
            padding-left: 28px;
        }
        .timeline::before {
            content: "";
            position: absolute;
            left: 5px;
            top: 4px;
            bottom: 4px;
            width: 2px;
            background: var(--line-dark);
        }
        .timeline-item {
            position: relative;
            padding-bottom: 36px;
        }
        .timeline-item:last-child {
            padding-bottom: 0;
        }
        .timeline-dot {
            position: absolute;
            left: -28px;
            top: 4px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--color-primary);
            border: 2px solid var(--bg-deep);
            box-shadow: 0 0 0 2px rgba(255, 77, 0, 0.3);
        }
        .timeline-content {
            background: var(--bg-surface);
            border: 1px solid var(--line-dark);
            border-radius: 12px;
            padding: 20px 22px;
            transition: border-color .3s ease;
        }
        .timeline-content:hover {
            border-color: rgba(255, 77, 0, 0.5);
        }
        .timeline-content h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-main);
            margin: 0 0 6px;
        }
        .timeline-content p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.65;
        }

        .faq-section {
            background: var(--bg-soft);
            color: var(--text-dark);
            padding: 90px 0;
        }
        .faq-wrap {
            display: grid;
            grid-template-columns: 0.8fr 1.2fr;
            gap: 60px;
        }
        .faq-left .section-title {
            color: var(--text-dark);
        }
        .faq-left p {
            color: #5A6572;
            font-size: 0.95rem;
            margin-bottom: 24px;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--line-light);
            border-radius: 12px;
            overflow: hidden;
            transition: border-color .3s ease, box-shadow .3s ease;
        }
        .faq-item.active {
            border-color: rgba(255, 77, 0, 0.35);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
        }
        .faq-question {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 18px 20px;
            cursor: pointer;
            user-select: none;
        }
        .faq-num {
            font-size: 0.8rem;
            font-weight: 800;
            color: var(--color-primary);
            font-feature-settings: "tnum";
            flex-shrink: 0;
        }
        .faq-question h3 {
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--text-dark);
            margin: 0;
            flex: 1;
            line-height: 1.5;
        }
        .faq-toggle {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: var(--color-primary);
            transition: transform .3s ease;
        }
        .faq-item.active .faq-toggle {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }
        .faq-answer p {
            font-size: 0.92rem;
            color: #5A6572;
            line-height: 1.75;
            padding: 0 20px 18px 50px;
            margin: 0;
            border-left: 2px solid var(--color-primary);
            margin-left: 32px;
            padding-left: 14px;
        }

        .cta-section {
            background: var(--bg-deep);
            padding: 90px 0;
        }
        .cta-wrap {
            display: grid;
            grid-template-columns: 0.9fr 1.1fr;
            gap: 56px;
        }
        .cta-left .section-desc {
            margin-bottom: 24px;
        }
        .contact-form {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .form-input {
            width: 100%;
            height: 44px;
            border-radius: 6px;
            border: 1px solid var(--line-dark);
            background: rgba(13, 17, 23, 0.5);
            color: var(--text-main);
            padding: 0 14px;
            font-size: 0.92rem;
            transition: border-color .2s ease, box-shadow .2s ease;
        }
        .form-input::placeholder {
            color: var(--text-muted);
            opacity: 0.8;
        }
        .form-input:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px var(--color-primary-glow);
        }
        textarea.form-input {
            height: auto;
            min-height: 100px;
            padding: 12px 14px;
            resize: vertical;
        }
        .form-select {
            appearance: none;
            background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' stroke='%239AA5B1' stroke-width='1.5' fill='none' stroke-linecap='round'/></svg>");
            background-repeat: no-repeat;
            background-position: right 14px center;
            padding-right: 36px;
        }
        .form-select option {
            background: var(--bg-surface);
            color: var(--text-main);
        }
        .btn-submit {
            width: 100%;
        }
        .contact-card {
            margin-top: 20px;
            background: var(--bg-surface);
            border: 1px solid var(--line-dark);
            border-radius: 12px;
            padding: 24px;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }
        .contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.9rem;
            color: var(--text-main);
        }
        .contact-item .icon-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-gold);
            flex-shrink: 0;
        }
        .contact-item .icon-dot.primary {
            background: var(--color-primary);
        }
        .contact-item .icon-dot.accent {
            background: var(--color-accent);
        }

        .site-footer {
            background: #0A0D12;
            padding: 56px 0 0;
            border-top: 1px solid var(--line-dark);
        }
        .footer-top-line {
            width: 120px;
            height: 2px;
            background: linear-gradient(90deg, var(--color-primary), transparent);
            margin-bottom: 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
        }
        .footer-logo {
            display: inline-flex;
            align-items: center;
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 14px;
        }
        .footer-desc {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 280px;
            margin: 0;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-main);
            margin: 0 0 16px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul a {
            font-size: 0.88rem;
            color: var(--text-muted);
            transition: color .2s ease;
        }
        .footer-col ul a:hover {
            color: var(--color-primary);
        }
        .footer-contact p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin: 0 0 8px;
        }
        .footer-bottom {
            border-top: 1px solid var(--line-dark);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 0.82rem;
            color: var(--text-muted);
        }

        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-wrap {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .faq-wrap {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .cta-wrap {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .btn-nav {
                display: none;
            }
            .menu-toggle {
                display: flex;
            }
            .category-hero {
                min-height: 480px;
                padding-top: 120px;
            }
            .hero-stats {
                gap: 24px;
            }
            .spotlight-card {
                grid-template-columns: 1fr;
            }
            .spotlight-body {
                padding: 22px;
            }
            .offset-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .offset-top,
            .offset-bottom {
                transform: none;
            }
            .scenarios-grid {
                grid-template-columns: 1fr;
            }
            .section {
                padding: 60px 0;
            }
            .form-row {
                grid-template-columns: 1fr;
            }
            .contact-card {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }
        @media (max-width: 520px) {
            .hero-title {
                font-size: 2.1rem;
            }
            .hero-sub {
                font-size: 0.95rem;
            }
            .hero-stats {
                gap: 16px;
                width: 100%;
            }
            .stat-num {
                font-size: 1.5rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .btn-primary,
            .btn-outline {
                width: 100%;
            }
            .hero-actions {
                flex-direction: column;
            }
        }

/* roulang page: article */
:root {
    --bg-deep: #0D1117;
    --bg-surface: #161C24;
    --bg-soft: #F6F5F2;
    --color-primary: #FF4D00;
    --color-primary-hover: #FF6A33;
    --color-primary-active: #E03E00;
    --color-primary-glow: rgba(255, 77, 0, 0.32);
    --color-accent: #00D4C6;
    --color-gold: #FFB800;
    --text-main: #EEF0F2;
    --text-muted: #9AA5B1;
    --text-dark: #1A202C;
    --line-dark: rgba(255, 255, 255, 0.12);
    --line-light: rgba(0, 0, 0, 0.08);
    --radius-card: 12px;
    --radius-btn: 6px;
    --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.45);
    --shadow-card-hover: 0 12px 32px rgba(0, 0, 0, 0.6);
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
    background: var(--bg-deep);
    color: var(--text-main);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }

  a {
    color: inherit;
    text-decoration: none;
  }

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

  button {
    font-family: inherit;
  }

  .container-custom {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
  }

  /* ===== Header / Nav ===== */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s, box-shadow 0.3s;
  }

  .site-header.scrolled {
    border-color: var(--line-dark);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.35);
  }

  .header-inner {
    display: flex;
    align-items: center;
    gap: 40px;
    height: 72px;
  }

  .logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.02em;
    line-height: 1.2;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .logo-badge {
    font-size: 0.6rem;
    color: var(--color-accent);
    border: 1px solid rgba(0, 212, 198, 0.4);
    padding: 2px 7px;
    border-radius: 99px;
    font-weight: 600;
    letter-spacing: 0.08em;
    line-height: 1;
  }

  .nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
  }

  .nav-link {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding: 8px 0;
    transition: color 0.2s ease;
  }

  .nav-link:hover {
    color: #fff;
  }

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

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

  .nav-link.active {
    color: #fff;
  }

  .nav-link.active::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
    margin-right: 6px;
    vertical-align: middle;
    box-shadow: 0 0 8px var(--color-primary-glow);
  }

  .header-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .nav-cta {
    padding: 0.55rem 1.25rem;
    font-size: 0.9rem;
    white-space: nowrap;
  }

  .nav-cta-mobile {
    display: none;
  }

  .menu-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line-dark);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.04);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    transition: border-color 0.2s;
  }

  .menu-toggle:hover {
    border-color: var(--color-primary);
  }

  .menu-toggle span {
    width: 18px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: all 0.3s ease;
  }

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

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

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

  /* ===== Buttons ===== */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    border-radius: var(--radius-btn);
    padding: 0.9rem 1.8rem;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    line-height: 1;
    transition: all 0.2s ease;
  }

  .btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 16px var(--color-primary-glow);
  }

  .btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 77, 0, 0.42);
  }

  .btn-primary:active {
    background: var(--color-primary-active);
    transform: translateY(0);
  }

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

  .btn-outline:hover {
    background: rgba(255, 77, 0, 0.08);
    transform: translateY(-2px);
  }

  .btn-outline:active {
    background: rgba(255, 77, 0, 0.14);
    transform: translateY(0);
  }

  /* ===== Article Main ===== */
  .article-main {
    padding-top: 118px;
    padding-bottom: 3rem;
    background:
      radial-gradient(circle at 82% 0%, rgba(0, 212, 198, 0.05), transparent 36%),
      radial-gradient(circle at 4% 18%, rgba(255, 77, 0, 0.05), transparent 30%),
      var(--bg-deep);
  }

  .breadcrumb {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.75rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .breadcrumb a {
    color: var(--text-muted);
    transition: color 0.2s;
  }

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

  .breadcrumb .current {
    color: var(--text-main);
    max-width: 280px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .article-wrap {
    max-width: 800px;
    margin: 0 auto;
  }

  .article-head {
    margin-bottom: 1.5rem;
  }

  .article-head h1 {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.35;
    color: #fff;
    letter-spacing: -0.02em;
  }

  .article-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
  }

  .cat-tag {
    background: rgba(255, 77, 0, 0.12);
    color: var(--color-primary);
    border: 1px solid rgba(255, 77, 0, 0.25);
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 99px;
    font-weight: 600;
    letter-spacing: 0.04em;
  }

  .meta-time {
    color: var(--color-accent);
    font-size: 0.85rem;
    font-feature-settings: "tnum";
  }

  .article-divider {
    height: 1px;
    background: linear-gradient(90deg, var(--line-dark), transparent);
    margin-bottom: 2rem;
  }

  /* ===== Article Body ===== */
  .article-body {
    max-width: 768px;
    margin: 0 auto;
    font-size: 1.05rem;
    line-height: 1.8;
    color: #E6E8EB;
  }

  .article-body p {
    margin-bottom: 1.25em;
  }

  .article-body h2 {
    font-size: 1.45rem;
    font-weight: 700;
    color: #fff;
    margin: 2em 0 0.75em;
    position: relative;
    padding-left: 14px;
  }

  .article-body h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 3px;
    border-radius: 2px;
    background: var(--color-primary);
  }

  .article-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    margin: 1.6em 0 0.5em;
  }

  .article-body ul,
  .article-body ol {
    margin: 0 0 1.25em 1.5em;
  }

  .article-body li {
    margin-bottom: 0.5em;
  }

  .article-body blockquote {
    border-left: 3px solid var(--color-primary);
    background: rgba(255, 77, 0, 0.06);
    padding: 1rem 1.25rem;
    margin: 1.5em 0;
    border-radius: 0 8px 8px 0;
    color: var(--text-muted);
    font-style: italic;
  }

  .article-body img {
    border-radius: 8px;
    margin: 1.5em 0;
    width: 100%;
    height: auto;
  }

  .article-body a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 4px;
  }

  .article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5em 0;
    font-size: 0.9rem;
  }

  .article-body th,
  .article-body td {
    border: 1px solid var(--line-dark);
    padding: 0.6rem 0.8rem;
    text-align: left;
  }

  .article-body th {
    background: rgba(255, 255, 255, 0.04);
    color: #fff;
    font-weight: 600;
  }

  .article-body pre {
    background: #0A0D12;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid var(--line-dark);
    line-height: 1.6;
  }

  .article-body code {
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 0.9em;
  }

  /* ===== Empty State ===== */
  .article-empty {
    background: var(--bg-surface);
    border: 1px dashed var(--line-dark);
    border-radius: var(--radius-card);
    padding: 3.5rem 2rem;
    text-align: center;
  }

  .article-empty p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
  }

  /* ===== Article Return ===== */
  .article-return {
    margin-top: 2.5rem;
    text-align: center;
  }

  .article-return .btn {
    min-width: 220px;
  }

  /* ===== Related Section ===== */
  .related-section {
    padding: 4rem 0;
    background: var(--bg-deep);
    border-top: 1px solid var(--line-dark);
  }

  .section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-primary);
    font-weight: 600;
  }

  .section-label::before {
    content: '';
    width: 8px;
    height: 2px;
    background: var(--color-primary);
  }

  .section-head h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-top: 0.5rem;
    color: #fff;
    letter-spacing: -0.01em;
  }

  .related-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
  }

  .related-card {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: var(--bg-surface);
    border: 1px solid var(--line-dark);
    border-radius: var(--radius-card);
    padding: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
  }

  .related-card:hover {
    border-color: rgba(255, 77, 0, 0.6);
    box-shadow: var(--shadow-card-hover);
  }

  .related-card img {
    width: 120px;
    height: 84px;
    object-fit: cover;
    border-radius: 8px;
    flex-shrink: 0;
  }

  .related-card-body h3 {
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 6px;
    line-height: 1.4;
  }

  .related-card-body p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .related-link {
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
    margin-top: 8px;
  }

  .related-card-wide {
    grid-column: 1 / -1;
  }

  .related-card-wide img {
    width: 160px;
    height: 100px;
  }

  /* ===== FAQ Section ===== */
  .faq-section {
    background: var(--bg-soft);
    color: var(--text-dark);
    padding: 4.5rem 0;
  }

  .faq-grid {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 3rem;
    align-items: start;
  }

  .faq-left h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-top: 0.5rem;
  }

  .faq-left p {
    color: #5A6572;
    margin-top: 1rem;
    font-size: 0.95rem;
  }

  .faq-list {
    margin-top: 0;
  }

  .faq-item {
    background: #fff;
    border: 1px solid var(--line-light);
    border-radius: var(--radius-card);
    margin-bottom: 0.75rem;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    overflow: hidden;
    transition: border-color 0.3s, box-shadow 0.3s;
  }

  .faq-item.active {
    border-color: rgba(255, 77, 0, 0.35);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  }

  .faq-q {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-dark);
  }

  .faq-num {
    color: var(--color-primary);
    font-weight: 700;
    font-feature-settings: "tnum";
    font-size: 0.9rem;
  }

  .faq-icon {
    margin-left: auto;
    color: var(--color-primary);
    font-size: 1.5rem;
    transition: transform 0.3s;
    line-height: 1;
    font-weight: 400;
  }

  .faq-item.active .faq-icon {
    transform: rotate(45deg);
  }

  .faq-a {
    display: none;
    padding: 0 1.25rem 1rem 1.45rem;
    color: #5A6572;
    font-size: 0.9rem;
    line-height: 1.7;
    position: relative;
  }

  .faq-a::before {
    content: '';
    position: absolute;
    left: 0.75rem;
    top: 0;
    bottom: 0.9rem;
    width: 2px;
    background: var(--color-primary);
    border-radius: 1px;
  }

  .faq-item.active .faq-a {
    display: block;
  }

  .faq-more {
    margin-top: 1.5rem;
  }

  /* ===== CTA Section ===== */
  .cta-section {
    background: var(--bg-deep);
    padding: 4.5rem 0;
    position: relative;
    overflow: hidden;
    border-top: 1px solid var(--line-dark);
  }

  .cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 85% 20%, rgba(255, 77, 0, 0.08), transparent 40%);
    pointer-events: none;
  }

  .cta-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    position: relative;
  }

  .cta-left h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.01em;
  }

  .cta-left>p {
    color: var(--text-muted);
    margin-top: 0.75rem;
    font-size: 0.95rem;
  }

  .contact-card {
    background: var(--bg-surface);
    border: 1px solid var(--line-dark);
    border-radius: var(--radius-card);
    padding: 1.5rem;
    margin-top: 1.75rem;
  }

  .contact-card p {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
  }

  .contact-card p::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-gold);
    border-radius: 2px;
    flex-shrink: 0;
  }

  .contact-card p:last-child {
    margin-bottom: 0;
  }

  .cta-form {
    background: var(--bg-surface);
    border: 1px solid var(--line-dark);
    border-radius: var(--radius-card);
    padding: 2rem;
    box-shadow: var(--shadow-card);
  }

  .form-group {
    margin-bottom: 1rem;
  }

  .form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-main);
    margin-bottom: 6px;
  }

  .form-group input,
  .form-group textarea {
    width: 100%;
    height: 44px;
    border: 1px solid var(--line-dark);
    border-radius: var(--radius-btn);
    background: rgba(255, 255, 255, 0.04);
    color: #fff;
    padding: 0 12px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .form-group textarea {
    height: 90px;
    padding-top: 10px;
    resize: vertical;
  }

  .form-group input::placeholder,
  .form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.25);
  }

  .form-group input:focus,
  .form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
  }

  .form-submit {
    width: 100%;
    margin-top: 0.25rem;
  }

  /* ===== Footer ===== */
  .site-footer {
    background: #0A0D12;
    padding: 3rem 0 0;
    border-top: 1px solid var(--line-dark);
  }

  .footer-top-line {
    width: 120px;
    height: 3px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--color-primary), transparent);
    margin-bottom: 2rem;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 2.5rem;
    padding-bottom: 2rem;
  }

  .footer-logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .footer-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 1rem;
    max-width: 28rem;
    line-height: 1.7;
  }

  .footer-col h4 {
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 1rem;
  }

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

  .footer-col li {
    margin-bottom: 0.6rem;
  }

  .footer-col a {
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: color 0.2s;
  }

  .footer-col a:hover {
    color: var(--color-primary);
  }

  .footer-contact p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
  }

  .footer-bottom {
    border-top: 1px solid var(--line-dark);
    padding: 1.2rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
  }

  .footer-copy,
  .footer-icp {
    font-feature-settings: "tnum";
  }

  /* ===== Responsive ===== */
  @media (max-width: 1024px) {
    .nav-links {
      gap: 1.4rem;
    }
  }

  @media (max-width: 900px) {
    .header-inner {
      gap: 16px;
    }

    .menu-toggle {
      display: flex;
    }

    .nav-cta {
      display: none !important;
    }

    .nav-links {
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(13, 17, 23, 0.97);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      flex-direction: column;
      align-items: flex-start;
      justify-content: flex-start;
      padding: 32px 28px;
      gap: 4px;
      transform: translateX(100%);
      transition: transform 0.35s ease;
      z-index: 99;
      overflow-y: auto;
    }

    .nav-links.open {
      transform: translateX(0);
    }

    .nav-link {
      font-size: 1.1rem;
      padding: 14px 0;
      color: var(--text-main);
      width: 100%;
    }

    .nav-cta-mobile {
      display: inline-flex;
      margin-top: 24px;
      width: 100%;
      justify-content: center;
    }

    .article-head h1 {
      font-size: 1.6rem;
    }

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

    .related-card-wide {
      grid-column: 1;
    }

    .faq-grid {
      grid-template-columns: 1fr;
      gap: 2rem;
    }

    .cta-grid {
      grid-template-columns: 1fr;
      gap: 2.5rem;
    }

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

  @media (max-width: 640px) {
    .container-custom {
      padding: 0 20px;
    }

    .article-main {
      padding-top: 100px;
    }

    .article-head h1 {
      font-size: 1.4rem;
    }

    .article-body {
      font-size: 1rem;
    }

    .related-card {
      flex-direction: column;
    }

    .related-card img,
    .related-card-wide img {
      width: 100%;
      height: 160px;
    }

    .faq-q {
      font-size: 0.9rem;
    }

    .cta-form {
      padding: 1.5rem;
    }

    .footer-grid {
      grid-template-columns: 1fr;
      gap: 2rem;
    }

    .footer-bottom {
      flex-direction: column;
      gap: 8px;
      text-align: center;
    }
  }

/* roulang page: category2 */
:root {
    --bg-deep: #0D1117;
    --bg-surface: #161C24;
    --bg-soft: #F6F5F2;
    --color-primary: #FF4D00;
    --color-primary-hover: #FF6A33;
    --color-primary-active: #E03E00;
    --color-primary-glow: rgba(255, 77, 0, 0.32);
    --color-accent: #00D4C6;
    --color-gold: #FFB800;
    --text-main: #EEF0F2;
    --text-muted: #9AA5B1;
    --text-dark: #1A202C;
    --line-dark: rgba(255, 255, 255, 0.12);
    --line-light: rgba(0, 0, 0, 0.08);
    --font-sans: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  }

  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.75;
    background: var(--bg-deep);
    color: var(--text-main);
    -webkit-font-smoothing: antialiased;
    font-feature-settings: "tnum";
  }
  img { max-width: 100%; display: block; }
  a { color: inherit; text-decoration: none; }
  button { font-family: inherit; cursor: pointer; }
  input, textarea { font-family: inherit; }
  ul { list-style: none; }

  .container-custom {
    max-width: 80rem;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }

  /* ===== 区块标签 ===== */
  .section-label {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    font-size: .75rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--color-primary);
    font-weight: 600;
  }
  .section-label::before {
    content: "";
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    display: inline-block;
    flex-shrink: 0;
  }
  .section-title {
    font-size: 2.1rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin-top: .6rem;
  }
  .section-sub { color: var(--text-muted); margin-top: .75rem; max-width: 46rem; }
  .light-section { background: var(--bg-soft); color: var(--text-dark); }
  .light-section .section-sub { color: #667085; }
  .light-section .section-title { color: var(--text-dark); }

  /* ===== 按钮 ===== */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    font-size: .95rem;
    font-weight: 600;
    border-radius: 6px;
    padding: .9rem 1.8rem;
    border: none;
    transition: all .2s ease;
    line-height: 1;
    white-space: nowrap;
  }
  .btn-primary { background: var(--color-primary); color: #fff; box-shadow: 0 4px 16px var(--color-primary-glow); }
  .btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-2px); }
  .btn-primary:active { background: var(--color-primary-active); transform: translateY(0); }
  .btn-outline { background: transparent; color: var(--color-primary); border: 1px solid var(--color-primary); }
  .btn-outline:hover { background: rgba(255, 77, 0, .08); }
  .btn-outline-light { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.4); }
  .btn-outline-light:hover { background: rgba(255,255,255,.08); border-color: #fff; }

  /* ===== 标签 ===== */
  .tag {
    display: inline-flex;
    align-items: center;
    padding: .25rem .75rem;
    border-radius: 999px;
    font-size: .75rem;
    background: rgba(255, 77, 0, .12);
    color: #FF6A33;
    border: 1px solid rgba(255, 77, 0, .2);
  }
  .tag-accent { background: rgba(0, 212, 198, .1); color: var(--color-accent); border-color: rgba(0, 212, 198, .25); }
  .tag-gold { background: rgba(255, 184, 0, .12); color: var(--color-gold); border-color: rgba(255, 184, 0, .2); }
  .tag-dark { background: rgba(255,255,255,.08); color: var(--text-main); border-color: rgba(255,255,255,.16); }

  /* ===== Header ===== */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(13, 17, 23, .85);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color .3s ease, box-shadow .3s ease;
  }
  .site-header.scrolled { border-bottom-color: var(--line-dark); box-shadow: 0 4px 24px rgba(0,0,0,.35); }
  .header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
  .site-logo {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -.02em;
  }
  .logo-badge {
    font-size: .6rem;
    color: var(--color-accent);
    background: rgba(0, 212, 198, .12);
    border: 1px solid rgba(0, 212, 198, .25);
    padding: .15rem .4rem;
    border-radius: 4px;
    font-weight: 600;
    letter-spacing: .05em;
  }
  .nav-links { display: flex; align-items: center; gap: 2rem; }
  .nav-link {
    position: relative;
    font-size: .95rem;
    color: var(--text-muted);
    padding: .35rem 0;
    transition: color .2s;
  }
  .nav-link:hover { color: var(--text-main); }
  .nav-link:hover::after, .nav-link.active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -4px;
    height: 2px;
    background: var(--color-primary);
  }
  .nav-link.active { color: var(--text-main); }
  .header-cta { display: flex; align-items: center; gap: .5rem; }
  .header-cta .btn { padding: .7rem 1.4rem; font-size: .9rem; }
  .nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: transparent;
    border: none;
    padding: 6px;
  }
  .nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-main);
    transition: transform .3s ease, opacity .3s ease;
  }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-deep);
    border-bottom: 1px solid var(--line-dark);
    padding: 1.5rem;
    z-index: 99;
  }
  .mobile-menu.open { display: block; }
  .mobile-menu .nav-link { display: block; font-size: 1.1rem; padding: .8rem 0; border-bottom: 1px solid rgba(255,255,255,.06); }
  .mobile-menu .btn { width: 100%; margin-top: 1rem; }

  /* ===== Hero ===== */
  .hero-section {
    position: relative;
    padding: 160px 0 100px;
    background-image: linear-gradient(105deg, rgba(13,17,23,.92) 30%, rgba(13,17,23,.55) 70%, rgba(13,17,23,.4)), url('/assets/images/backpic/back-1.png');
    background-size: cover;
    background-position: center;
  }
  .hero-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 120px;
    height: 6px;
    background: var(--color-primary);
  }
  .hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }
  .hero-title { font-size: 2.8rem; font-weight: 800; line-height: 1.2; letter-spacing: -.02em; margin-top: 1rem; }
  .hero-title .highlight { color: var(--color-primary); }
  .hero-desc { color: var(--text-muted); font-size: 1.05rem; margin-top: 1.2rem; max-width: 34rem; }
  .hero-actions { display: flex; gap: 1rem; margin-top: 2rem; flex-wrap: wrap; }
  .hero-badges {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 2.5rem;
    max-width: 36rem;
  }
  .hero-badge {
    background: rgba(255, 255, 255, .04);
    border: 1px solid var(--line-dark);
    border-radius: 12px;
    padding: 1.1rem 1.2rem;
    text-align: center;
  }
  .hero-badge .num { font-size: 1.7rem; font-weight: 800; color: var(--text-main); font-feature-settings: "tnum"; }
  .hero-badge .num em { font-style: normal; color: var(--color-primary); }
  .hero-badge .desc { font-size: .78rem; color: var(--text-muted); margin-top: .2rem; }

  /* ===== 通用卡片 ===== */
  .card {
    background: var(--bg-surface);
    border: 1px solid var(--line-dark);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,.45);
    transition: border-color .25s ease, box-shadow .25s ease;
  }
  .card:hover { border-color: rgba(255, 77, 0, .5); box-shadow: 0 12px 32px rgba(0,0,0,.6); }
  .card-light {
    background: #fff;
    border: 1px solid var(--line-light);
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0,0,0,.06);
  }
  .card-light:hover { border-color: rgba(255, 77, 0, .35); box-shadow: 0 8px 24px rgba(0,0,0,.12); }

  /* ===== 核心能力 ===== */
  .capability-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
  .capability-card { padding: 2rem 1.75rem; position: relative; overflow: hidden; }
  .capability-card:nth-child(2) { transform: translateY(24px); }
  .capability-card .index {
    font-size: 2rem;
    font-weight: 800;
    color: rgba(255, 77, 0, .35);
    font-feature-settings: "tnum";
  }
  .capability-card h3 { font-size: 1.15rem; font-weight: 700; margin-top: .8rem; }
  .capability-card p { color: var(--text-muted); font-size: .9rem; margin-top: .5rem; line-height: 1.7; }
  .capability-card::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 1.75rem;
    width: 36px;
    height: 3px;
    background: var(--color-primary);
  }

  /* ===== 数据服务单列大卡 ===== */
  .service-large-card {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    background: var(--bg-surface);
    border: 1px solid var(--line-dark);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0,0,0,.45);
    transition: border-color .25s ease, box-shadow .25s ease;
  }
  .service-large-card:hover { border-color: rgba(255,77,0,.5); box-shadow: 0 12px 32px rgba(0,0,0,.6); }
  .service-large-card .img-wrap { min-height: 260px; position: relative; overflow: hidden; }
  .service-large-card .img-wrap img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
  .service-large-card:hover .img-wrap img { transform: scale(1.02); }
  .service-large-card .img-wrap::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent 70%, var(--bg-surface) 100%);
  }
  .service-large-card .content { padding: 2.2rem; display: flex; flex-direction: column; justify-content: center; }
  .service-large-card .title { font-size: 1.5rem; font-weight: 800; margin-top: .6rem; }
  .service-large-card .desc { color: var(--text-muted); font-size: .95rem; margin-top: .8rem; line-height: 1.8; }
  .service-large-card .tags { display: flex; gap: .5rem; margin-top: 1rem; flex-wrap: wrap; }
  .service-large-card .link {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    color: var(--color-primary);
    font-weight: 600;
    font-size: .9rem;
    margin-top: 1.3rem;
    transition: gap .2s;
  }
  .service-large-card .link:hover { gap: .65rem; }

  /* ===== 流程 ===== */
  .process-section { background: var(--bg-soft); color: var(--text-dark); }
  .process-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 2.5rem; }
  .process-step {
    position: relative;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--line-light);
    box-shadow: 0 4px 16px rgba(0,0,0,.05);
    padding: 2rem 1.5rem;
    transition: box-shadow .25s ease;
  }
  .process-step:hover { box-shadow: 0 8px 24px rgba(0,0,0,.1); }
  .process-step .step-num { font-size: 2.2rem; font-weight: 800; color: var(--color-primary); opacity: .6; font-feature-settings: "tnum"; }
  .process-step h3 { font-size: 1.05rem; font-weight: 700; margin-top: .6rem; color: var(--text-dark); }
  .process-step p { font-size: .85rem; color: #667085; margin-top: .4rem; line-height: 1.7; }
  .process-step::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -.75rem;
    width: 1.5rem;
    height: 2px;
    background: var(--color-primary);
    opacity: .5;
  }
  .process-step:last-child::after { display: none; }

  /* ===== 数据条 ===== */
  .stats-section { background: var(--bg-deep); padding: 3.5rem 0; }
  .stats-bar {
    background: var(--bg-surface);
    border: 1px solid var(--line-dark);
    border-radius: 12px;
    padding: 2.5rem 2rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    position: relative;
  }
  .stats-bar .stat-item { text-align: center; padding: 0 1rem; position: relative; }
  .stats-bar .stat-item:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -.75rem;
    top: 20%;
    bottom: 20%;
    width: 1px;
    background: var(--line-dark);
  }
  .stat-item .big { font-size: 3rem; font-weight: 800; color: var(--text-main); font-feature-settings: "tnum"; line-height: 1.1; }
  .stat-item .big em { font-style: normal; color: var(--color-primary); }
  .stat-item .bar { height: 6px; background: rgba(255,255,255,.08); border-radius: 3px; margin: .8rem auto .4rem; max-width: 140px; overflow: hidden; }
  .stat-item .bar span { display: block; height: 100%; background: var(--color-primary); border-radius: 3px; }
  .stat-item .label { font-size: .85rem; color: var(--text-muted); margin-top: .3rem; }

  /* ===== FAQ ===== */
  .faq-section { background: var(--bg-soft); color: var(--text-dark); }
  .faq-layout { display: grid; grid-template-columns: 1fr 1.6fr; gap: 3rem; align-items: start; }
  .faq-item {
    background: #fff;
    border: 1px solid var(--line-light);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: box-shadow .2s;
  }
  .faq-item.active { box-shadow: 0 8px 24px rgba(0,0,0,.08); border-color: rgba(255,77,0,.25); }
  .faq-q {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.2rem 1.5rem;
    cursor: pointer;
    user-select: none;
  }
  .faq-q .q-num { font-weight: 800; color: var(--color-primary); font-size: .9rem; font-feature-settings: "tnum"; }
  .faq-q .q-text { flex: 1; font-weight: 600; font-size: .98rem; color: var(--text-dark); }
  .faq-q .q-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1px solid var(--line-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--color-primary);
    transition: transform .3s ease, background .3s ease;
    flex-shrink: 0;
  }
  .faq-item.active .q-icon { transform: rotate(45deg); background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
  .faq-a { display: none; padding: 0 1.5rem 1.3rem; padding-left: calc(1.5rem + 1.4rem); color: #667085; font-size: .92rem; line-height: 1.75; border-left: 2px solid var(--color-primary); margin-left: 1.5rem; margin-right: 1.5rem; margin-bottom: 1rem; }
  .faq-item.active .faq-a { display: block; }

  /* ===== 联系 ===== */
  .contact-section { background: var(--bg-deep); }
  .contact-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 3rem; }
  .form-group { margin-bottom: 1.2rem; }
  .form-group label { display: block; font-size: .85rem; font-weight: 500; color: var(--text-main); margin-bottom: .4rem; }
  .form-group input, .form-group textarea {
    width: 100%;
    height: 44px;
    border: 1px solid var(--line-dark);
    border-radius: 6px;
    padding: 0 12px;
    background: rgba(13,17,23,.6);
    color: var(--text-main);
    font-size: .92rem;
    transition: border-color .2s, box-shadow .2s;
  }
  .form-group textarea { height: 110px; padding: 10px 12px; resize: vertical; }
  .form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
  }
  .contact-info-card {
    background: var(--bg-surface);
    border: 1px solid var(--line-dark);
    border-radius: 12px;
    padding: 2rem 1.8rem;
  }
  .contact-info-card h3 { font-size: 1.2rem; font-weight: 700; }
  .contact-info-card ul { margin-top: 1.2rem; }
  .contact-info-card li { display: flex; align-items: flex-start; gap: .8rem; padding: .6rem 0; border-bottom: 1px solid rgba(255,255,255,.05); font-size: .9rem; color: var(--text-muted); }
  .contact-info-card li:last-child { border-bottom: none; }
  .contact-info-card li span.icon { color: var(--color-gold); font-size: 1rem; width: 20px; flex-shrink: 0; }

  /* ===== Footer ===== */
  .site-footer { background: #0A0D12; color: var(--text-muted); }
  .footer-top-line { width: 120px; height: 3px; background: linear-gradient(90deg, var(--color-primary), transparent); margin-bottom: 2.5rem; }
  .footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 2.5rem; }
  .footer-logo { font-size: 1.4rem; font-weight: 800; color: var(--text-main); display: flex; align-items: center; gap: .4rem; }
  .footer-logo .logo-badge { font-size: .6rem; color: var(--color-accent); background: rgba(0,212,198,.12); border: 1px solid rgba(0,212,198,.25); padding: .15rem .4rem; border-radius: 4px; }
  .footer-desc { font-size: .88rem; margin-top: .8rem; line-height: 1.7; max-width: 22rem; }
  .footer-col h4 { font-size: .95rem; font-weight: 600; color: var(--text-main); margin-bottom: .9rem; }
  .footer-col ul li { margin-bottom: .5rem; }
  .footer-col a { font-size: .88rem; color: var(--text-muted); transition: color .2s; }
  .footer-col a:hover { color: var(--color-primary); }
  .footer-contact p { font-size: .88rem; margin-bottom: .4rem; }
  .footer-bottom {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: .8rem;
    color: rgba(255,255,255,.35);
    flex-wrap: wrap;
    gap: .5rem;
  }

  /* ===== 响应式 ===== */
  @media (max-width: 1024px) {
    .hero-title { font-size: 2.3rem; }
    .nav-links { gap: 1.2rem; }
    .stat-item .big { font-size: 2.2rem; }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .process-step::after { display: none; }
    .capability-grid { grid-template-columns: repeat(2, 1fr); }
    .capability-card:nth-child(2) { transform: none; }
    .service-large-card { grid-template-columns: 1fr; }
    .service-large-card .img-wrap { min-height: 220px; }
    .service-large-card .img-wrap::after { background: linear-gradient(0deg, transparent 70%, var(--bg-surface) 100%); }
  }
  @media (max-width: 768px) {
    .nav-links { display: none; }
    .header-cta .btn { display: none; }
    .nav-toggle { display: flex; }
    .hero-grid { grid-template-columns: 1fr; }
    .hero-section { padding: 130px 0 70px; }
    .hero-badges { grid-template-columns: repeat(2, 1fr); }
    .capability-grid { grid-template-columns: 1fr; }
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
    .stats-bar .stat-item:nth-child(2)::after { display: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .faq-layout { grid-template-columns: 1fr; }
    .hero-title { font-size: 1.9rem; }
  }
  @media (max-width: 520px) {
    .container-custom { padding-left: 1rem; padding-right: 1rem; }
    .hero-actions .btn { width: 100%; }
    .process-steps { grid-template-columns: 1fr; }
    .stats-bar { grid-template-columns: 1fr; }
    .stats-bar .stat-item::after { display: none !important; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .footer-bottom::after { display: none; }
    .section-title { font-size: 1.6rem; }
    .service-large-card .content { padding: 1.4rem; }
  }