/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #EEF2FF;
  --accent: #F59E0B;
  --accent-light: #FEF3C7;
  --bg: #F8FAFC;
  --bg-alt: #F1F5F9;
  --surface: #FFFFFF;
  --text: #1E293B;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --border: #E2E8F0;
  --radius: 1rem;
  --radius-sm: .75rem;
  --radius-lg: 1.5rem;
  --shadow-sm: 0 2px 12px rgba(30,41,59,.06);
  --shadow: 0 4px 24px rgba(30,41,59,.08);
  --shadow-hover: 0 12px 40px rgba(30,41,59,.14);
  --transition: all .3s cubic-bezier(.4,0,.2,1);
  --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

/* ===== 基础 Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; }
button { font-family: inherit; cursor: pointer; }
p { margin-bottom: 1rem; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; margin-bottom: .5rem; }

/* ===== 容器 ===== */
.container { max-width: 1200px; }
@media (min-width: 1400px) {
  .container { max-width: 1280px; }
}

/* ===== 排版辅助 ===== */
.section-label {
  display: inline-block;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-light);
  border-radius: 100px;
  padding: 6px 20px;
  margin-bottom: 16px;
}
.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--text);
  margin-bottom: 14px;
}
.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
}
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}
.section { padding: 100px 0; }
.section-alt { background: var(--surface); }
.section-light { background: var(--bg); }

/* ===== Header / 导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1050;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s ease;
}
.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(30,41,59,.08);
}
.navbar {
  padding: 16px 0;
}
.navbar-brand {
  display: flex;
  align-items: center;
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--text);
  line-height: 1.2;
}
.navbar-brand:hover { color: var(--text); }
.brand-dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 9px;
  box-shadow: 0 0 0 4px rgba(245,158,11,.18);
  flex-shrink: 0;
}
.navbar-toggler {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
}
.navbar-toggler:focus {
  box-shadow: 0 0 0 3px rgba(79,70,229,.15);
  border-color: var(--primary);
}
.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(30,41,59,0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
.navbar-nav .nav-item { margin: 0 4px; }
.navbar-nav .nav-link {
  font-weight: 500;
  font-size: .95rem;
  color: var(--text-muted);
  padding: 8px 18px;
  position: relative;
  border-radius: 100px;
  transition: color .3s ease, background .3s ease;
}
.navbar-nav .nav-link:hover {
  color: var(--primary);
  background: var(--primary-light);
}
.navbar-nav .nav-link.active {
  color: var(--primary);
  font-weight: 600;
  background: var(--primary-light);
}
.navbar-nav .nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--primary);
}
.nav-cta {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 100px;
  padding: 10px 24px;
  font-size: .9rem;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-cta:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79,70,229,.3);
}
.nav-cta:active {
  transform: translateY(0);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 160px 0 110px;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(30,27,75,.92) 0%, rgba(67,56,202,.72) 50%, rgba(79,70,229,.48) 100%);
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(180deg, transparent, var(--bg));
  z-index: 3;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 840px;
  margin: 0 auto;
  text-align: center;
  color: #fff;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 100px;
  padding: 8px 20px;
  font-size: .88rem;
  font-weight: 500;
  color: rgba(255,255,255,.95);
  margin-bottom: 28px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.hero-badge i {
  color: var(--accent);
}
.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.15;
  margin-bottom: 16px;
  color: #fff;
}
.hero-subtitle {
  font-size: 1.45rem;
  font-weight: 500;
  color: rgba(255,255,255,.92);
  margin-bottom: 16px;
}
.hero-desc {
  font-size: 1.06rem;
  color: rgba(255,255,255,.75);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.hero-btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #1E293B;
  border: none;
  border-radius: 100px;
  padding: 13px 32px;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
}
.hero-btn-primary:hover {
  background: #D97706;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(245,158,11,.35);
}
.hero-btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,.55);
  border-radius: 100px;
  padding: 13px 32px;
  font-size: 1rem;
  font-weight: 500;
  transition: var(--transition);
}
.hero-btn-ghost:hover {
  background: rgba(255,255,255,.12);
  border-color: #fff;
  color: #fff;
  transform: translateY(-2px);
}
.hero-trust {
  display: flex;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  font-size: .86rem;
  color: rgba(255,255,255,.7);
}
.hero-trust span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.hero-trust i {
  color: #34D399;
}
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,.65);
  font-size: .82rem;
  letter-spacing: .08em;
  transition: color .3s;
  z-index: 4;
  text-transform: uppercase;
}
.hero-scroll:hover { color: #fff; }
.scroll-line {
  width: 1px;
  height: 36px;
  background: linear-gradient(180deg, rgba(255,255,255,.7), transparent);
  display: block;
}

/* ===== 特色卡片 ===== */
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  height: 100%;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity .4s;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}
.feature-card:hover::before {
  opacity: 1;
}
.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--primary-light);
  color: var(--primary);
  margin-bottom: 24px;
  transition: var(--transition);
}
.feature-card:hover .feature-icon {
  transform: scale(1.06);
}
.feature-card:nth-child(2) .feature-icon { background: #FFF7ED; color: #F97316; }
.feature-card:nth-child(3) .feature-icon { background: #ECFDF5; color: #10B981; }
.feature-card:nth-child(4) .feature-icon { background: #FEFCE8; color: #EAB308; }
.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}
.feature-card p {
  color: var(--text-muted);
  font-size: .95rem;
  line-height: 1.7;
  margin-bottom: 0;
}

/* ===== 分类卡片 ===== */
.category-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: block;
  min-height: 340px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  background: var(--surface);
}
.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.category-card img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  display: block;
  transition: transform .6s ease;
}
.category-card:hover img {
  transform: scale(1.04);
}
.category-body {
  padding: 28px;
}
.category-tag {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 12px;
}
.category-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}
.category-body p {
  color: var(--text-muted);
  font-size: .95rem;
  margin-bottom: 16px;
  line-height: 1.7;
}
.category-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-weight: 600;
  font-size: .92rem;
}
.category-link i {
  transition: transform .3s;
}
.category-card:hover .category-link i {
  transform: translateX(4px);
}

/* ===== 资讯卡片（CMS） ===== */
.news-section {
  background: var(--bg);
}
.news-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  height: 100%;
  transition: var(--transition);
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}
.news-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 10px;
  flex-wrap: wrap;
}
.news-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: .8rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 14px;
  border-radius: 100px;
}
.news-date {
  font-size: .82rem;
  color: var(--text-light);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.news-card h3 {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color .3s;
}
.news-card:hover h3 {
  color: var(--primary);
}
.news-card p {
  color: var(--text-muted);
  font-size: .92rem;
  line-height: 1.7;
  margin-bottom: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-empty {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 60px 30px;
  text-align: center;
  color: var(--text-muted);
}
.news-empty i {
  font-size: 2.5rem;
  color: var(--text-light);
  display: block;
  margin-bottom: 14px;
}

/* ===== 数据统计 ===== */
.stats-section {
  background: linear-gradient(135deg, #1E1B4B 0%, #4338CA 100%);
  padding: 90px 0;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.stats-section::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: rgba(245,158,11,.12);
}
.stats-section::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: -40px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: rgba(255,255,255,.06);
}
.stat-item {
  text-align: center;
  padding: 30px 20px;
  position: relative;
  z-index: 1;
}
.stat-number {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.02em;
  margin-bottom: 8px;
  background: linear-gradient(180deg, #fff 20%, rgba(255,255,255,.75));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: .98rem;
  color: rgba(255,255,255,.75);
  letter-spacing: .04em;
}
.stat-divider {
  border-left: 1px solid rgba(255,255,255,.12);
}

/* ===== 使用流程 ===== */
.process-section {
  background: var(--surface);
}
.process-step {
  text-align: center;
  padding: 40px 28px;
  position: relative;
  height: 100%;
}
.process-icon {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin: 0 auto 24px;
  position: relative;
  transition: var(--transition);
  box-shadow: 0 0 0 6px rgba(79,70,229,.08);
}
.process-step:hover .process-icon {
  transform: scale(1.06);
  box-shadow: 0 0 0 8px rgba(79,70,229,.12);
}
.process-num {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(245,158,11,.4);
}
.process-step h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}
.process-step p {
  color: var(--text-muted);
  font-size: .92rem;
  line-height: 1.7;
  margin-bottom: 0;
  max-width: 240px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== FAQ ===== */
.faq-section {
  background: var(--bg);
}
.accordion {
  max-width: 820px;
  margin: 0 auto;
}
.accordion-item {
  border: 1px solid var(--border);
  border-radius: var(--radius) !important;
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm) !important;
}
.accordion-item:first-of-type {
  border-top: 1px solid var(--border);
  border-radius: var(--radius) !important;
}
.accordion-item:last-of-type {
  border-bottom: 1px solid var(--border);
  border-radius: var(--radius) !important;
}
.accordion-button {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  padding: 20px 26px;
  background: var(--surface);
  box-shadow: none !important;
}
.accordion-button:not(.collapsed) {
  background: var(--primary-light);
  color: var(--primary);
}
.accordion-button:focus {
  box-shadow: 0 0 0 3px rgba(79,70,229,.12);
  border-color: var(--primary);
}
.accordion-button::after {
  background-size: 1rem;
  transition: transform .3s;
}
.accordion-body {
  color: var(--text-muted);
  font-size: .95rem;
  line-height: 1.8;
  padding: 20px 26px;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

/* ===== CTA ===== */
.cta-section {
  padding: 110px 0;
  position: relative;
  background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
  text-align: center;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(30,27,75,.88) 0%, rgba(67,56,202,.78) 100%);
}
.cta-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  margin: 0 auto;
  color: #fff;
}
.cta-content h2 {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 16px;
}
.cta-content p {
  font-size: 1.1rem;
  color: rgba(255,255,255,.8);
  margin-bottom: 36px;
}
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--accent);
  color: #1E293B;
  border: none;
  border-radius: 100px;
  padding: 15px 42px;
  font-size: 1.05rem;
  font-weight: 700;
  transition: var(--transition);
}
.cta-btn:hover {
  background: #D97706;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(245,158,11,.35);
}
.cta-note {
  margin-top: 20px;
  font-size: .85rem;
  color: rgba(255,255,255,.55);
}

/* ===== 页脚 ===== */
.site-footer {
  background: #0F172A;
  padding: 70px 0 30px;
  color: var(--text-light);
}
.footer-brand {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-brand .brand-dot {
  background: var(--accent);
}
.footer-desc {
  font-size: .92rem;
  color: #94A3B8;
  max-width: 320px;
  line-height: 1.7;
}
.footer-heading {
  font-size: .98rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
  position: relative;
  display: inline-block;
}
.footer-heading::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 22px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #94A3B8;
  font-size: .92rem;
  transition: color .3s, padding-left .3s;
}
.footer-links a:hover {
  color: #fff;
  padding-left: 4px;
}
.footer-links a i {
  font-size: .7rem;
  color: var(--primary);
}
.footer-contact {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: #94A3B8;
  font-size: .92rem;
  margin-bottom: 12px;
}
.footer-contact i {
  color: var(--accent);
  margin-top: 4px;
  font-size: .85rem;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 24px;
  margin-top: 48px;
  text-align: center;
  font-size: .85rem;
  color: #64748B;
}
.footer-bottom a {
  color: #94A3B8;
}
.footer-bottom a:hover {
  color: #fff;
}

/* ===== 动画 ===== */
@keyframes floatY {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-18px) rotate(8deg); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: .4; }
  50% { opacity: .8; }
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.8rem; }
  .hero-subtitle { font-size: 1.25rem; }
  .section-title { font-size: 2rem; }
  .stat-number { font-size: 2.6rem; }
  .stat-divider { border-left: none; }
}

@media (max-width: 768px) {
  .site-header {
    position: absolute;
  }
  .navbar-collapse {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-top: 12px;
    border: 1px solid var(--border);
  }
  .navbar-nav .nav-link {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }
  .navbar-nav .nav-link.active::after {
    left: 16px;
    transform: none;
    width: 4px;
    height: 4px;
  }
  .nav-cta {
    margin-top: 12px;
    width: 100%;
    text-align: center;
  }
  .hero { min-height: 90vh; padding: 140px 0 100px; }
  .hero-title { font-size: 2.2rem; }
  .hero-subtitle { font-size: 1.1rem; }
  .hero-desc { font-size: .95rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-btn-primary, .hero-btn-ghost { width: 100%; max-width: 320px; justify-content: center; }
  .hero-trust { gap: 16px; font-size: .8rem; }
  .section { padding: 70px 0; }
  .section-title { font-size: 1.7rem; }
  .section-header { margin-bottom: 40px; }
  .feature-card { padding: 32px 24px; }
  .category-card { min-height: auto; }
  .category-card img { height: 200px; }
  .stat-number { font-size: 2.2rem; }
  .stats-section { padding: 60px 0; }
  .process-step { padding: 28px 20px; }
  .cta-content h2 { font-size: 1.9rem; }
  .cta-content p { font-size: 1rem; }
  .footer-contact { margin-bottom: 24px; }
}

@media (max-width: 520px) {
  .hero-title { font-size: 1.8rem; }
  .hero-subtitle { font-size: 1rem; }
  .hero-badge { font-size: .8rem; padding: 6px 16px; }
  .hero-trust { flex-direction: column; gap: 8px; }
  .section-title { font-size: 1.5rem; }
  .section-desc { font-size: .95rem; }
  .stat-number { font-size: 1.8rem; }
  .news-card { padding: 22px; }
  .cta-btn { width: 100%; max-width: 320px; justify-content: center; }
  .navbar-brand { font-size: 1rem; }
  .footer-brand { font-size: 1.1rem; }
}

/* 滚动条定制 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-alt);
}
::-webkit-scrollbar-thumb {
  background: #CBD5E1;
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: #94A3B8;
}

/* 焦点可见性 */
a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(79,70,229,.4);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Bootstrap 按钮覆盖 */
.btn { border-radius: 100px; }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #5b6af0;
            --primary-light: #8b96f8;
            --primary-dark: #4152d9;
            --accent: #f5a623;
            --accent-light: #ffe8c2;
            --bg: #f6f8ff;
            --white: #ffffff;
            --text: #1b2035;
            --text-light: #6b7280;
            --text-lighter: #9aa1b5;
            --border: #e6eaf3;
            --border-dark: #d3dae8;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow: 0 8px 24px rgba(91, 106, 240, 0.09);
            --shadow-lg: 0 18px 44px rgba(91, 106, 240, 0.15);
            --spacing: 96px;
            --nav-height: 76px;
        }

        /* ===== Base Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.25s ease;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            list-style: none;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        .container {
            max-width: 1200px;
            padding-left: 20px;
            padding-right: 20px;
            margin: 0 auto;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1040;
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 6px 20px rgba(27, 32, 53, 0.06);
        }
        .site-header .navbar {
            min-height: var(--nav-height);
            padding: 0;
        }
        .navbar-brand {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 10px;
            padding-left: 0;
        }
        .navbar-brand:hover {
            color: var(--primary);
        }
        .brand-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: inline-block;
            box-shadow: 0 0 0 4px rgba(91, 106, 240, 0.14);
        }
        .navbar-nav {
            gap: 4px;
        }
        .nav-item .nav-link {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-light);
            padding: 10px 18px !important;
            border-radius: 30px;
            position: relative;
            transition: all 0.3s ease;
        }
        .nav-item .nav-link:hover {
            color: var(--primary);
            background: rgba(91, 106, 240, 0.06);
        }
        .nav-item .nav-link.active {
            color: var(--primary);
            background: rgba(91, 106, 240, 0.08);
        }
        .nav-item .nav-link.active::after {
            content: "";
            position: absolute;
            left: 50%;
            bottom: 4px;
            transform: translateX(-50%);
            width: 18px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 9px 24px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff !important;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 700;
            box-shadow: 0 6px 18px rgba(65, 82, 217, 0.28);
            transition: all 0.3s ease;
        }
        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(65, 82, 217, 0.36);
        }
        .navbar-toggler {
            border: none;
            padding: 6px 10px;
            border-radius: 8px;
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(91, 106, 240, 0.24);
        }
        .navbar-toggler-icon {
            width: 22px;
            height: 22px;
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(27,32,53,0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* ===== Article Banner ===== */
        .article-banner {
            position: relative;
            padding: 88px 0 72px;
            background:
                linear-gradient(118deg, rgba(20, 26, 46, 0.92) 0%, rgba(65, 82, 217, 0.84) 60%, rgba(91, 106, 240, 0.7) 100%),
                url('/assets/images/backpic/back-1.png') center / cover no-repeat;
            color: #fff;
            border-bottom: 6px solid var(--accent);
        }
        .article-banner .breadcrumb {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
            display: inline-flex;
            align-items: center;
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.85rem;
            margin-bottom: 26px;
            border: 1px solid rgba(255, 255, 255, 0.18);
        }
        .article-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.78);
        }
        .article-banner .breadcrumb a:hover {
            color: #fff;
        }
        .article-banner .breadcrumb .breadcrumb-sep {
            margin: 0 10px;
            color: rgba(255, 255, 255, 0.5);
        }
        .article-banner .breadcrumb .breadcrumb-current {
            color: #fff;
            font-weight: 600;
            max-width: 280px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .article-banner h1 {
            font-size: clamp(1.8rem, 3.6vw, 2.8rem);
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.02em;
            max-width: 860px;
            margin-bottom: 18px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            align-items: center;
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.82);
        }
        .article-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .badge-pill {
            background: var(--accent);
            color: #1b2035;
            font-weight: 700;
            padding: 5px 16px;
            border-radius: 20px;
            font-size: 0.82rem;
        }

        /* ===== Article Content Section ===== */
        .article-section {
            padding: var(--spacing) 0;
        }
        .article-main-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            overflow: hidden;
            margin-bottom: 40px;
        }
        .article-cover {
            position: relative;
            height: 340px;
            overflow: hidden;
        }
        .article-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .article-cover::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(20, 26, 46, 0.35));
            pointer-events: none;
        }
        .article-body {
            padding: 44px 48px 32px;
        }
        .article-body-content {
            font-size: 1.02rem;
            line-height: 1.85;
            color: #2a3042;
        }
        .article-body-content p {
            margin-bottom: 1.5rem;
        }
        .article-body-content h2 {
            font-size: 1.4rem;
            font-weight: 800;
            margin: 2rem 0 1rem;
            padding-left: 16px;
            border-left: 4px solid var(--primary);
            border-radius: 2px;
        }
        .article-body-content h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin: 1.8rem 0 0.8rem;
        }
        .article-body-content ul {
            margin: 1rem 0 1.5rem;
            padding-left: 20px;
        }
        .article-body-content ul li {
            position: relative;
            padding-left: 18px;
            margin-bottom: 10px;
        }
        .article-body-content ul li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 13px;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
        }
        .article-body-content blockquote {
            background: #f6f8ff;
            border-left: 4px solid var(--accent);
            border-radius: 0 12px 12px 0;
            padding: 18px 24px;
            margin: 1.5rem 0;
            font-style: italic;
            color: var(--text-light);
        }
        .article-body-content img {
            border-radius: var(--radius);
            margin: 1.5rem 0;
            box-shadow: var(--shadow);
        }
        .article-tags-block {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            padding: 28px 48px;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .tag-chip {
            background: #f0f3ff;
            color: var(--primary-dark);
            border-radius: 20px;
            padding: 6px 16px;
            font-size: 0.82rem;
            font-weight: 600;
            border: 1px solid rgba(91, 106, 240, 0.16);
            transition: all 0.25s ease;
        }
        .tag-chip:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .article-share {
            padding: 20px 48px 30px;
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .share-label {
            font-weight: 600;
            color: var(--text-light);
            font-size: 0.9rem;
        }
        .share-btn {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--border);
            background: #fff;
            color: var(--text-light);
            transition: all 0.25s ease;
            font-size: 0.9rem;
        }
        .share-btn:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }

        /* ===== Article Not Found ===== */
        .article-not-found {
            text-align: center;
            padding: 70px 40px;
        }
        .article-not-found .nf-icon {
            font-size: 3rem;
            color: var(--primary-light);
            margin-bottom: 20px;
        }
        .article-not-found h2 {
            font-size: 1.6rem;
            font-weight: 800;
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-light);
            margin-bottom: 28px;
        }

        /* ===== Sidebar ===== */
        .sidebar-widget {
            background: var(--white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            padding: 28px;
            margin-bottom: 28px;
        }
        .sidebar-title {
            font-size: 1.05rem;
            font-weight: 800;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-title i {
            color: var(--primary);
        }
        .side-cat-link {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 16px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: #fafbfe;
            margin-bottom: 12px;
            transition: all 0.3s ease;
        }
        .side-cat-link:last-child {
            margin-bottom: 0;
        }
        .side-cat-link:hover {
            border-color: var(--primary);
            background: #f0f3ff;
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .side-cat-icon {
            width: 42px;
            height: 42px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .side-cat-icon.cat-a {
            background: linear-gradient(135deg, #5b6af0, #8b96f8);
        }
        .side-cat-icon.cat-b {
            background: linear-gradient(135deg, #f5a623, #ffc766);
        }
        .side-cat-text strong {
            display: block;
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text);
        }
        .side-cat-text small {
            font-size: 0.8rem;
            color: var(--text-light);
            display: block;
            margin-top: 2px;
        }
        .recommend-list li {
            display: flex;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px dashed var(--border);
            transition: all 0.25s ease;
        }
        .recommend-list li:last-child {
            border-bottom: none;
        }
        .recommend-list li:hover {
            padding-left: 6px;
        }
        .recommend-list .num {
            font-weight: 800;
            color: var(--primary-light);
            font-size: 1.1rem;
            line-height: 1.4;
            min-width: 24px;
            text-align: center;
        }
        .recommend-list a {
            font-size: 0.9rem;
            color: var(--text);
            line-height: 1.5;
            font-weight: 500;
        }
        .recommend-list a:hover {
            color: var(--primary);
        }
        .sidebar-contact-card {
            background: linear-gradient(160deg, #f6f8ff, #eef1ff);
            border: 1px solid rgba(91, 106, 240, 0.12);
            text-align: center;
            padding: 30px 24px;
        }
        .sidebar-contact-card .contact-icon {
            width: 54px;
            height: 54px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.3rem;
            margin: 0 auto 16px;
        }
        .sidebar-contact-card h5 {
            font-weight: 800;
            margin-bottom: 8px;
        }
        .sidebar-contact-card p {
            font-size: 0.88rem;
            color: var(--text-light);
            margin-bottom: 18px;
        }
        .sidebar-contact-card .btn-contact {
            background: var(--primary);
            color: #fff;
            border-radius: 30px;
            padding: 9px 28px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            border: none;
        }
        .sidebar-contact-card .btn-contact:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(65, 82, 217, 0.3);
        }

        /* ===== Related Section ===== */
        .related-section {
            padding: calc(var(--spacing) * 0.9) 0;
            background: var(--white);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .section-head {
            text-align: center;
            margin-bottom: 46px;
        }
        .section-head .section-kicker {
            display: inline-block;
            background: #f0f3ff;
            color: var(--primary);
            font-weight: 700;
            font-size: 0.85rem;
            padding: 6px 20px;
            border-radius: 30px;
            margin-bottom: 14px;
            border: 1px solid rgba(91, 106, 240, 0.12);
        }
        .section-head h2 {
            font-size: clamp(1.7rem, 3vw, 2.4rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 10px;
        }
        .section-head p {
            color: var(--text-light);
            max-width: 560px;
            margin: 0 auto;
            font-size: 1rem;
        }
        .related-card {
            background: var(--bg);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            height: 100%;
            transition: all 0.35s ease;
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(91, 106, 240, 0.24);
        }
        .related-card .card-img {
            height: 180px;
            overflow: hidden;
            position: relative;
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .related-card:hover .card-img img {
            transform: scale(1.06);
        }
        .related-card .card-body {
            padding: 24px;
        }
        .related-card .card-tag {
            display: inline-block;
            background: rgba(91, 106, 240, 0.12);
            color: var(--primary);
            font-size: 0.78rem;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: 12px;
        }
        .related-card h5 {
            font-size: 1.02rem;
            font-weight: 700;
            line-height: 1.5;
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card h5 a {
            color: var(--text);
        }
        .related-card h5 a:hover {
            color: var(--primary);
        }
        .related-card .card-summary {
            font-size: 0.88rem;
            color: var(--text-light);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 14px;
        }
        .related-card .card-link {
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .related-card .card-link i {
            font-size: 0.75rem;
            transition: transform 0.25s ease;
        }
        .related-card .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: var(--spacing) 0;
            background:
                linear-gradient(135deg, rgba(20, 26, 46, 0.94), rgba(65, 82, 217, 0.88)),
                url('/assets/images/backpic/back-2.png') center / cover no-repeat;
            color: #fff;
            text-align: center;
        }
        .cta-section h2 {
            font-size: clamp(1.8rem, 3.2vw, 2.6rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 18px;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.84);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 38px;
            background: var(--accent);
            color: #1b2035;
            border-radius: 40px;
            font-weight: 800;
            font-size: 1rem;
            border: none;
            box-shadow: 0 10px 30px rgba(245, 166, 35, 0.34);
            transition: all 0.3s ease;
        }
        .btn-cta:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 36px rgba(245, 166, 35, 0.44);
            color: #1b2035;
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 13px 34px;
            border: 1px solid rgba(255, 255, 255, 0.5);
            color: #fff;
            border-radius: 40px;
            font-weight: 700;
            font-size: 0.95rem;
            transition: all 0.3s ease;
        }
        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border-color: #fff;
        }

        /* ===== FAQ Section ===== */
        .faq-section {
            padding: var(--spacing) 0;
            background: var(--bg);
        }
        .faq-item {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 26px 30px;
            margin-bottom: 16px;
            transition: all 0.3s ease;
        }
        .faq-item:hover {
            border-color: rgba(91, 106, 240, 0.3);
            box-shadow: var(--shadow);
        }
        .faq-item summary {
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-weight: 700;
            font-size: 1rem;
        }
        .faq-item summary::after {
            content: "+";
            font-size: 1.4rem;
            font-weight: 400;
            color: var(--primary);
            flex-shrink: 0;
            transition: transform 0.3s ease;
        }
        .faq-item[open] summary::after {
            content: "−";
        }
        .faq-item .faq-body {
            padding-top: 16px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item .faq-body::before {
            content: "";
            display: block;
            width: 30px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
            margin-bottom: 14px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #141a2e;
            color: rgba(255, 255, 255, 0.72);
            padding: 64px 0 30px;
        }
        .footer-brand {
            font-size: 1.4rem;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 11px;
            margin-bottom: 16px;
        }
        .footer-brand .brand-dot {
            background: linear-gradient(135deg, #8b96f8, #f5a623);
        }
        .footer-desc {
            font-size: 0.92rem;
            line-height: 1.7;
            max-width: 360px;
            margin-bottom: 0;
        }
        .footer-heading {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 20px;
            letter-spacing: 0.02em;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.92rem;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.25s ease;
        }
        .footer-links a i {
            font-size: 0.65rem;
            color: var(--primary-light);
        }
        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 14px;
            font-size: 0.9rem;
        }
        .footer-contact li i {
            color: var(--accent);
            margin-top: 4px;
            width: 16px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 40px;
            padding-top: 24px;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
        }

        /* ===== Focus States ===== */
        a:focus-visible,
        button:focus-visible {
            outline: 3px solid rgba(91, 106, 240, 0.4);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            :root {
                --spacing: 76px;
            }
            .article-body {
                padding: 36px 32px 28px;
            }
            .article-tags-block {
                padding: 24px 32px;
            }
            .article-share {
                padding: 18px 32px 26px;
            }
        }
        @media (max-width: 991px) {
            .navbar-collapse {
                background: var(--white);
                border-radius: 16px;
                padding: 20px;
                box-shadow: var(--shadow-lg);
                margin-top: 10px;
                border: 1px solid var(--border);
            }
            .navbar-nav {
                gap: 0;
                margin-bottom: 14px;
            }
            .nav-item .nav-link {
                padding: 10px 16px !important;
                border-radius: 10px;
                margin-bottom: 4px;
            }
            .nav-item .nav-link.active::after {
                display: none;
            }
            .nav-cta {
                justify-content: center;
                width: 100%;
            }
            .related-section .row>[class*="col-"] {
                margin-bottom: 24px;
            }
            .article-cover {
                height: 280px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --spacing: 60px;
            }
            .article-banner {
                padding: 60px 0 48px;
            }
            .article-banner h1 {
                font-size: 1.6rem;
            }
            .article-meta {
                gap: 12px;
                font-size: 0.85rem;
            }
            .article-body {
                padding: 28px 22px 22px;
            }
            .article-tags-block {
                padding: 22px;
            }
            .article-share {
                padding: 16px 22px 22px;
            }
            .article-cover {
                height: 220px;
            }
            .footer-brand {
                margin-bottom: 12px;
            }
            .section-head {
                margin-bottom: 32px;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .btn-cta,
            .btn-ghost {
                padding: 12px 28px;
                font-size: 0.92rem;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .article-banner {
                padding: 48px 0 40px;
            }
            .article-banner h1 {
                font-size: 1.35rem;
            }
            .article-banner .breadcrumb {
                font-size: 0.78rem;
                padding: 6px 14px;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .sidebar-widget {
                padding: 20px;
            }
            .related-card .card-body {
                padding: 18px;
            }
            .faq-item {
                padding: 20px;
            }
        }
        @media (min-width: 992px) {
            .navbar-nav .nav-link {
                position: relative;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #5B6AF0;
            --primary-rgb: 91, 106, 240;
            --primary-light: #EDF0FE;
            --accent: #F0A64A;
            --accent-rgb: 240, 166, 74;
            --dark: #1A1F36;
            --dark-rgb: 26, 31, 54;
            --body-bg: #FFFFFF;
            --light-bg: #F7F8FC;
            --body-text: #2D3350;
            --muted-text: #6F7690;
            --border: #E8EAF3;
            --card-bg: #FFFFFF;
            --radius-lg: 20px;
            --radius-md: 14px;
            --radius-sm: 8px;
            --shadow: 0 8px 30px rgba(30, 35, 80, 0.08);
            --shadow-hover: 0 16px 48px rgba(30, 35, 80, 0.14);
            --transition: all 0.3s ease;
            --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            color: var(--body-text);
            background: var(--body-bg);
            line-height: 1.7;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
        }

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

        a:hover {
            color: #4a55d6;
        }

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
        }

        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
        }

        .site-header .navbar {
            padding-top: 16px;
            padding-bottom: 16px;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.3rem;
            color: var(--dark);
            letter-spacing: 0.02em;
        }

        .navbar-brand:hover {
            color: var(--dark);
        }

        .brand-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.16);
            flex-shrink: 0;
        }

        .navbar-nav {
            gap: 6px;
        }

        .nav-item .nav-link {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--body-text);
            padding: 8px 18px;
            border-radius: 100px;
            transition: var(--transition);
            position: relative;
        }

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

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

        .nav-item .nav-link.active::after {
            content: "";
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 4px;
            height: 4px;
            background: var(--primary);
            border-radius: 50%;
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--dark);
            color: #fff;
            padding: 9px 22px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            border: 1px solid transparent;
            white-space: nowrap;
        }

        .nav-cta:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(var(--primary-rgb), 0.28);
        }

        .navbar-toggler {
            border: none;
            padding: 6px;
            color: var(--dark);
        }

        .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid rgba(var(--primary-rgb), 0.4);
            border-radius: 8px;
        }

        /* Page Banner */
        .page-banner {
            position: relative;
            background: var(--dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            padding: 110px 0 90px;
            overflow: hidden;
        }

        .page-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(26, 31, 54, 0.88), rgba(26, 31, 54, 0.55));
        }

        .page-banner .container {
            position: relative;
            z-index: 2;
        }

        .page-banner .breadcrumb-bar {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.85rem;
            letter-spacing: 0.05em;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .page-banner .breadcrumb-bar i {
            font-size: 0.75rem;
        }

        .page-banner .breadcrumb-bar a {
            color: rgba(255, 255, 255, 0.85);
        }

        .page-banner .breadcrumb-bar a:hover {
            color: #fff;
        }

        .page-banner h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 18px;
            letter-spacing: -0.02em;
        }

        .page-banner .banner-desc {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.15rem;
            max-width: 620px;
            line-height: 1.8;
        }

        .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            padding: 6px 16px;
            border-radius: 100px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
        }

        /* Section styles */
        .section {
            padding: 90px 0;
        }

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

        .section-head {
            max-width: 700px;
            margin: 0 auto 60px;
            text-align: center;
        }

        .section-head .section-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 5px 18px;
            border-radius: 100px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }

        .section-head h2 {
            font-size: 2.3rem;
            font-weight: 800;
            color: var(--dark);
            line-height: 1.25;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }

        .section-head p {
            color: var(--muted-text);
            font-size: 1.05rem;
            line-height: 1.7;
        }

        /* Feature Cards */
        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
            position: relative;
            box-shadow: 0 2px 10px rgba(30, 35, 80, 0.03);
        }

        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }

        .feature-card .card-media {
            position: relative;
            height: 200px;
            overflow: hidden;
        }

        .feature-card .card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }

        .feature-card:hover .card-media img {
            transform: scale(1.04);
        }

        .feature-card .card-media::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(26, 31, 54, 0.25));
        }

        .feature-card .card-icon {
            position: absolute;
            bottom: -26px;
            left: 28px;
            width: 58px;
            height: 58px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            box-shadow: 0 8px 20px rgba(var(--primary-rgb), 0.35);
            z-index: 2;
            border: 3px solid #fff;
        }

        .feature-card .card-body {
            padding: 40px 26px 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 10px;
        }

        .feature-card p {
            color: var(--muted-text);
            font-size: 0.92rem;
            line-height: 1.7;
            flex: 1;
        }

        .feature-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.88rem;
            color: var(--primary);
            margin-top: 16px;
            transition: var(--transition);
        }

        .feature-card .card-link i {
            transition: transform 0.3s ease;
        }

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

        .feature-card.accent .card-icon {
            background: var(--accent);
            box-shadow: 0 8px 20px rgba(var(--accent-rgb), 0.35);
        }

        /* Showcase */
        .showcase-item {
            padding: 30px 0;
        }

        .showcase-item .showcase-media {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            position: relative;
        }

        .showcase-item .showcase-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 290px;
        }

        .showcase-item .showcase-media::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(45deg, rgba(var(--primary-rgb), 0.06), transparent);
            pointer-events: none;
        }

        .showcase-item .showcase-body {
            display: flex;
            flex-direction: column;
            justify-content: center;
            height: 100%;
            padding: 30px 20px;
        }

        .showcase-item .showcase-index {
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 0.15em;
            color: var(--primary);
            margin-bottom: 12px;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .showcase-item .showcase-index::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }

        .showcase-item h3 {
            font-size: 1.7rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .showcase-item p {
            color: var(--muted-text);
            font-size: 1rem;
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .showcase-item .showcase-list {
            list-style: none;
            padding: 0;
            margin: 0 0 24px;
        }

        .showcase-item .showcase-list li {
            padding: 6px 0;
            font-size: 0.95rem;
            color: var(--body-text);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .showcase-item .showcase-list li i {
            color: var(--primary);
            font-size: 0.85rem;
            width: 20px;
            height: 20px;
            background: var(--primary-light);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .showcase-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 0.92rem;
            color: var(--primary);
            background: var(--primary-light);
            padding: 10px 24px;
            border-radius: 100px;
            transition: var(--transition);
            align-self: flex-start;
            border: none;
        }

        .showcase-btn:hover {
            background: var(--primary);
            color: #fff;
            transform: translateX(4px);
            box-shadow: 0 8px 20px rgba(var(--primary-rgb), 0.25);
        }

        /* Stats */
        .stats-section {
            background: var(--dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            position: relative;
            padding: 90px 0;
            overflow: hidden;
        }

        .stats-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(26, 31, 54, 0.92), rgba(38, 45, 80, 0.78));
        }

        .stats-section .container {
            position: relative;
            z-index: 2;
        }

        .stat-item {
            text-align: center;
            padding: 30px 20px;
            border-radius: var(--radius-lg);
            transition: var(--transition);
            position: relative;
        }

        .stat-item:hover {
            background: rgba(255, 255, 255, 0.05);
            transform: translateY(-4px);
        }

        .stat-item .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 6px;
            letter-spacing: -0.03em;
        }

        .stat-item .stat-label {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.95rem;
            font-weight: 500;
        }

        .stat-divider {
            width: 40px;
            height: 3px;
            background: var(--accent);
            border-radius: 3px;
            margin: 12px auto 16px;
        }

        /* Related posts */
        .post-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .post-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-6px);
        }

        .post-card .post-media {
            height: 180px;
            overflow: hidden;
        }

        .post-card .post-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

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

        .post-card .post-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .post-card .post-meta {
            font-size: 0.8rem;
            color: var(--muted-text);
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }

        .post-card .post-meta i {
            color: var(--primary);
        }

        .post-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .post-card p {
            font-size: 0.88rem;
            color: var(--muted-text);
            line-height: 1.7;
            flex: 1;
        }

        .post-card .post-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .post-card .post-link:hover {
            gap: 10px;
        }

        /* FAQ */
        .faq-wrapper {
            max-width: 800px;
            margin: 0 auto;
        }

        .accordion-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-md) !important;
            margin-bottom: 14px;
            overflow: hidden;
            background: #fff;
            box-shadow: 0 2px 8px rgba(30, 35, 80, 0.03);
        }

        .accordion-header {
            background: #fff;
        }

        .accordion-button {
            background: #fff;
            color: var(--dark);
            font-weight: 600;
            font-size: 1rem;
            padding: 20px 24px;
            box-shadow: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
        }

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

        .accordion-button:focus {
            box-shadow: none;
            outline: 2px solid rgba(var(--primary-rgb), 0.3);
        }

        .accordion-button::after {
            background-image: none;
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            content: "\f078";
            color: var(--primary);
            font-size: 0.85rem;
            transition: var(--transition);
            width: 28px;
            height: 28px;
            background-color: var(--primary-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .accordion-button:not(.collapsed)::after {
            transform: rotate(180deg);
            background-color: var(--primary);
            color: #fff;
        }

        .accordion-body {
            padding: 0 24px 22px;
            color: var(--muted-text);
            font-size: 0.95rem;
            line-height: 1.8;
            border-top: 1px solid var(--border);
            padding-top: 16px;
        }

        /* CTA */
        .cta-section {
            padding: 90px 0;
            background: var(--light-bg);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: "";
            position: absolute;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(var(--primary-rgb), 0.1), transparent 70%);
            border-radius: 50%;
            top: -100px;
            left: 10%;
        }

        .cta-section::after {
            content: "";
            position: absolute;
            width: 350px;
            height: 350px;
            background: radial-gradient(circle, rgba(var(--accent-rgb), 0.1), transparent 70%);
            border-radius: 50%;
            bottom: -100px;
            right: 5%;
        }

        .cta-box {
            background: var(--dark);
            border-radius: 28px;
            padding: 70px 50px;
            position: relative;
            overflow: hidden;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            box-shadow: var(--shadow-hover);
        }

        .cta-box::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(26, 31, 54, 0.9), rgba(26, 31, 54, 0.65));
        }

        .cta-box .container {
            position: relative;
            z-index: 2;
        }

        .cta-box h2 {
            color: #fff;
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .cta-box p {
            color: rgba(255, 255, 255, 0.75);
            font-size: 1.05rem;
            max-width: 600px;
            margin-bottom: 32px;
            line-height: 1.8;
        }

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

        .btn-main {
            background: var(--accent);
            color: var(--dark);
            font-weight: 700;
            padding: 12px 32px;
            border-radius: 100px;
            border: none;
            font-size: 0.95rem;
            transition: var(--transition);
            box-shadow: 0 8px 24px rgba(var(--accent-rgb), 0.35);
        }

        .btn-main:hover {
            background: #fff;
            color: var(--dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(255, 255, 255, 0.2);
        }

        .btn-ghost {
            background: transparent;
            color: #fff;
            font-weight: 600;
            padding: 12px 32px;
            border-radius: 100px;
            border: 1.5px solid rgba(255, 255, 255, 0.35);
            font-size: 0.95rem;
            transition: var(--transition);
        }

        .btn-ghost:hover {
            border-color: #fff;
            color: #fff;
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }

        /* Footer */
        .site-footer {
            background: var(--dark);
            padding: 70px 0 24px;
            color: rgba(255, 255, 255, 0.68);
        }

        .site-footer .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }

        .site-footer .footer-desc {
            font-size: 0.92rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.55);
            max-width: 340px;
        }

        .site-footer .footer-heading {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }

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

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

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

        .site-footer .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
        }

        .site-footer .footer-links a i {
            font-size: 0.7rem;
            color: var(--accent);
        }

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

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

        .site-footer .footer-contact li {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
        }

        .site-footer .footer-contact li i {
            color: var(--accent);
            width: 20px;
            text-align: center;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: 48px;
            padding-top: 24px;
            text-align: center;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.35);
        }

        /* Mobile responsive */
        @media (max-width: 991px) {
            .page-banner {
                padding: 80px 0 60px;
            }

            .page-banner h1 {
                font-size: 2.2rem;
            }

            .section {
                padding: 64px 0;
            }

            .section-head h2 {
                font-size: 1.8rem;
            }

            .navbar-collapse {
                padding-top: 14px;
                border-top: 1px solid var(--border);
                margin-top: 8px;
            }

            .navbar-nav {
                gap: 2px;
                margin-bottom: 14px;
            }

            .nav-item .nav-link {
                padding: 10px 16px;
            }

            .nav-cta {
                margin: 4px 0 10px;
                justify-content: center;
            }
        }

        @media (max-width: 767px) {
            .page-banner {
                padding: 60px 0 48px;
            }

            .page-banner h1 {
                font-size: 1.8rem;
            }

            .page-banner .banner-desc {
                font-size: 0.95rem;
            }

            .section {
                padding: 48px 0;
            }

            .section-head {
                margin-bottom: 36px;
            }

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

            .feature-card .card-media {
                height: 160px;
            }

            .showcase-item {
                padding: 12px 0;
            }

            .showcase-item h3 {
                font-size: 1.3rem;
            }

            .stat-item .stat-number {
                font-size: 2rem;
            }

            .cta-box {
                padding: 40px 24px;
                border-radius: 20px;
            }

            .cta-box h2 {
                font-size: 1.5rem;
            }

            .cta-buttons .btn-main,
            .cta-buttons .btn-ghost {
                width: 100%;
                text-align: center;
            }

            .site-footer {
                padding-top: 50px;
            }
        }

        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.5rem;
            }

            .page-banner .banner-desc {
                font-size: 0.85rem;
            }

            .section-head h2 {
                font-size: 1.3rem;
            }

            .showcase-item .showcase-list li {
                font-size: 0.86rem;
            }

            .accordion-button {
                font-size: 0.9rem;
                padding: 16px 18px;
            }

            .accordion-body {
                font-size: 0.85rem;
                padding: 12px 18px 16px;
            }

            .feature-card .card-body {
                padding: 32px 20px 22px;
            }
        }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --c-primary: #5B6BF5;
            --c-primary-deep: #4756E0;
            --c-secondary: #F0A35E;
            --c-secondary-soft: #FFF4E8;
            --c-bg: #F8F9FC;
            --c-bg-white: #FFFFFF;
            --c-bg-soft: #EEF1FB;
            --c-text: #1F2A44;
            --c-text-light: #5A6785;
            --c-border: #E4E8F2;
            --radius-lg: 18px;
            --radius-md: 14px;
            --radius-sm: 9px;
            --shadow-card: 0 6px 28px rgba(31, 42, 68, 0.08);
            --shadow-hover: 0 14px 38px rgba(91, 107, 245, 0.14);
            --transition-base: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --space-section: 96px;
        }

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

        body {
            font-family: var(--font-main);
            color: var(--c-text);
            background-color: var(--c-bg);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

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

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

        ul,
        ol {
            list-style: none;
            margin: 0;
            padding: 0;
        }

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(91, 107, 245, 0.35);
            outline-offset: 2px;
        }

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

        /* ===== 导航 ===== */
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(228, 232, 242, 0.7);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 0;
            transition: var(--transition-base);
        }

        .site-header .navbar {
            padding: 16px 0;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 19px;
            font-weight: 800;
            letter-spacing: 0.5px;
            color: var(--c-text) !important;
        }

        .brand-dot {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-secondary) 100%);
            box-shadow: 0 4px 14px rgba(91, 107, 245, 0.3);
            display: inline-block;
            position: relative;
            flex-shrink: 0;
        }

        .brand-dot::after {
            content: '';
            position: absolute;
            inset: 6px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.85);
        }

        .navbar-nav {
            gap: 6px;
        }

        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--c-text-light) !important;
            padding: 8px 18px !important;
            border-radius: 40px;
            position: relative;
            transition: var(--transition-base);
        }

        .nav-link:hover {
            color: var(--c-primary) !important;
            background-color: var(--c-bg-soft);
        }

        .nav-link.active {
            color: var(--c-primary) !important;
            background-color: var(--c-bg-soft);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 18px;
            height: 3px;
            border-radius: 4px;
            background: linear-gradient(90deg, var(--c-primary), var(--c-secondary));
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, var(--c-primary), var(--c-primary-deep));
            color: #fff !important;
            font-size: 14px;
            font-weight: 600;
            padding: 10px 24px;
            border-radius: 40px;
            box-shadow: 0 6px 18px rgba(91, 107, 245, 0.3);
            transition: var(--transition-base);
        }

        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(91, 107, 245, 0.4);
        }

        .navbar-toggler {
            border: 1px solid var(--c-border);
            padding: 6px 10px;
            border-radius: 8px;
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(91, 107, 245, 0.2);
        }

        /* ===== Hero Banner ===== */
        .category-hero {
            background: linear-gradient(135deg, rgba(91, 107, 245, 0.97), rgba(71, 86, 224, 0.9)), 
                        url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            padding: 88px 0 90px;
            position: relative;
            overflow: hidden;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -80px;
            width: 320px;
            height: 320px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.07);
        }

        .category-hero::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: 20%;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
        }

        .category-hero .hero-inner {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 780px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            font-size: 13px;
            font-weight: 500;
            padding: 8px 18px;
            border-radius: 40px;
            margin-bottom: 24px;
            backdrop-filter: blur(6px);
        }

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

        .category-hero h1 {
            font-size: 42px;
            font-weight: 800;
            color: #fff;
            line-height: 1.3;
            margin-bottom: 18px;
            letter-spacing: 1px;
        }

        .category-hero .hero-sub {
            font-size: 17px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 34px;
        }

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

        .hero-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 30px;
            border-radius: 40px;
            font-size: 15px;
            font-weight: 600;
            transition: var(--transition-base);
        }

        .hero-btn-primary {
            background: #fff;
            color: var(--c-primary);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }

        .hero-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
            color: var(--c-primary-deep);
        }

        .hero-btn-outline {
            border: 2px solid rgba(255, 255, 255, 0.5);
            color: #fff;
        }

        .hero-btn-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            color: #fff;
            transform: translateY(-3px);
        }

        /* ===== 通用板块 ===== */
        .section-block {
            padding: var(--space-section) 0;
        }

        .section-block.bg-white {
            background: var(--c-bg-white);
        }

        .section-block.bg-soft {
            background: var(--c-bg-soft);
        }

        .section-head {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 52px;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: var(--c-primary);
            background: rgba(91, 107, 245, 0.1);
            padding: 6px 16px;
            border-radius: 40px;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

        .section-head h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--c-text);
            line-height: 1.35;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }

        .section-head p {
            font-size: 16px;
            color: var(--c-text-light);
            line-height: 1.8;
        }

        /* ===== 步骤流程 ===== */
        .steps-section {
            padding: var(--space-section) 0;
        }

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

        .step-card {
            background: var(--c-bg-white);
            border-radius: var(--radius-lg);
            padding: 36px 26px;
            text-align: center;
            border: 1px solid var(--c-border);
            box-shadow: var(--shadow-card);
            position: relative;
            transition: var(--transition-base);
        }

        .step-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
        }

        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            background: linear-gradient(135deg, var(--c-primary), var(--c-primary-deep));
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            box-shadow: 0 8px 20px rgba(91, 107, 245, 0.3);
        }

        .step-card:nth-child(2) .step-number {
            background: linear-gradient(135deg, var(--c-secondary), #E98A3A);
            box-shadow: 0 8px 20px rgba(240, 163, 94, 0.3);
        }

        .step-card:nth-child(3) .step-number {
            background: linear-gradient(135deg, #31B08C, #1E9670);
            box-shadow: 0 8px 20px rgba(49, 176, 140, 0.3);
        }

        .step-card:nth-child(4) .step-number {
            background: linear-gradient(135deg, #9B7BE8, #7B5CD0);
            box-shadow: 0 8px 20px rgba(155, 123, 232, 0.3);
        }

        .step-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--c-text);
        }

        .step-card p {
            font-size: 14px;
            color: var(--c-text-light);
            line-height: 1.7;
            margin-bottom: 0;
        }

        .step-arrow {
            position: absolute;
            top: 50%;
            right: -20px;
            transform: translateY(-50%);
            color: var(--c-border);
            font-size: 18px;
            z-index: 2;
        }

        /* ===== 分类内容卡片 ===== */
        .guide-cards {
            padding: var(--space-section) 0;
        }

        .card {
            border: 1px solid var(--c-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            height: 100%;
            background: var(--c-bg-white);
            box-shadow: var(--shadow-card);
            transition: var(--transition-base);
        }

        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(91, 107, 245, 0.2);
        }

        .card-img-wrap {
            position: relative;
            height: 210px;
            overflow: hidden;
        }

        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .card:hover .card-img-wrap img {
            transform: scale(1.06);
        }

        .card-img-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(31, 42, 68, 0.5), transparent 60%);
        }

        .card-body {
            padding: 28px 26px;
        }

        .card-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-bottom: 14px;
        }

        .badge-tag {
            background: rgba(91, 107, 245, 0.1);
            color: var(--c-primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 20px;
        }

        .card-body h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--c-text);
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .card-body p {
            font-size: 14px;
            color: var(--c-text-light);
            line-height: 1.75;
            margin-bottom: 16px;
        }

        .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 14px;
            border-top: 1px solid var(--c-border);
        }

        .card-meta span {
            font-size: 13px;
            color: var(--c-text-light);
        }

        .card-meta a {
            font-size: 14px;
            font-weight: 600;
            color: var(--c-primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .card-meta a:hover {
            color: var(--c-primary-deep);
            gap: 10px;
        }

        /* ===== 数据区块 ===== */
        .data-section {
            background: linear-gradient(135deg, #1F2A44 0%, #2A3860 100%);
            padding: 80px 0;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .data-section::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -100px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(91, 107, 245, 0.2);
        }

        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .data-item h3 {
            font-size: 42px;
            font-weight: 800;
            margin-bottom: 6px;
            background: linear-gradient(135deg, #fff, #C9D1F5);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .data-item p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 0;
        }

        .data-icon {
            font-size: 26px;
            margin-bottom: 16px;
            color: var(--c-secondary);
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: var(--space-section) 0;
        }

        .faq-wrap {
            max-width: 820px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--c-bg-white);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            margin-bottom: 14px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(31, 42, 68, 0.04);
            transition: var(--transition-base);
        }

        .faq-item:hover {
            border-color: rgba(91, 107, 245, 0.25);
            box-shadow: var(--shadow-card);
        }

        .faq-header {
            padding: 22px 26px;
            display: flex;
            align-items: center;
            gap: 14px;
            cursor: pointer;
        }

        .faq-header .faq-icon {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: rgba(91, 107, 245, 0.12);
            color: var(--c-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            flex-shrink: 0;
        }

        .faq-header h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--c-text);
            margin-bottom: 0;
            flex: 1;
        }

        .faq-header .fa-chevron-down {
            font-size: 13px;
            color: var(--c-text-light);
            transition: transform 0.3s ease;
        }

        .faq-item.open .fa-chevron-down {
            transform: rotate(180deg);
            color: var(--c-primary);
        }

        .faq-body {
            padding: 0 26px 22px 70px;
            font-size: 14px;
            color: var(--c-text-light);
            line-height: 1.8;
            display: none;
        }

        .faq-item.open .faq-body {
            display: block;
        }

        /* ===== 资源列表 ===== */
        .resource-section {
            padding: var(--space-section) 0;
            background: var(--c-bg-white);
        }

        .resource-list {
            max-width: 900px;
            margin: 0 auto;
        }

        .resource-item {
            display: flex;
            gap: 20px;
            padding: 26px 20px;
            border-bottom: 1px solid var(--c-border);
            transition: var(--transition-base);
            border-radius: var(--radius-md);
        }

        .resource-item:hover {
            background: var(--c-bg-soft);
            padding-left: 28px;
        }

        .resource-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: rgba(91, 107, 245, 0.1);
            color: var(--c-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            flex-shrink: 0;
        }

        .resource-item:nth-child(2) .resource-icon {
            background: rgba(240, 163, 94, 0.12);
            color: var(--c-secondary);
        }

        .resource-item:nth-child(3) .resource-icon {
            background: rgba(49, 176, 140, 0.12);
            color: #31B08C;
        }

        .resource-content {
            flex: 1;
        }

        .resource-content h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--c-text);
        }

        .resource-content p {
            font-size: 14px;
            color: var(--c-text-light);
            margin-bottom: 0;
            line-height: 1.7;
        }

        .resource-link {
            display: flex;
            align-items: center;
            font-size: 14px;
            font-weight: 600;
            color: var(--c-primary);
            white-space: nowrap;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(91, 107, 245, 0.95), rgba(71, 86, 224, 0.92)), 
                        url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            padding: 84px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section h2 {
            font-size: 34px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }

        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 640px;
            margin: 0 auto 32px;
        }

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

        .btn-cta-white {
            background: #fff;
            color: var(--c-primary);
            padding: 13px 36px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .btn-cta-white:hover {
            transform: translateY(-3px);
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.18);
            color: var(--c-primary-deep);
        }

        .btn-cta-ghost {
            border: 2px solid rgba(255, 255, 255, 0.5);
            color: #fff;
            padding: 12px 34px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .btn-cta-ghost:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            color: #fff;
            transform: translateY(-3px);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #1B2440;
            color: rgba(255, 255, 255, 0.75);
            padding: 72px 0 0;
            font-size: 14px;
        }

        .footer-brand {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 18px;
        }

        .footer-desc {
            font-size: 14px;
            line-height: 1.9;
            color: rgba(255, 255, 255, 0.55);
            max-width: 360px;
            margin-bottom: 0;
        }

        .footer-heading {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 12px;
        }

        .footer-heading::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 30px;
            height: 3px;
            border-radius: 3px;
            background: linear-gradient(90deg, var(--c-primary), var(--c-secondary));
        }

        .footer-links li,
        .footer-contact li {
            margin-bottom: 12px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition-base);
        }

        .footer-links a i {
            font-size: 10px;
            color: var(--c-primary);
        }

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

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 12px;
            color: rgba(255, 255, 255, 0.6);
        }

        .footer-contact i {
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            color: var(--c-secondary);
            flex-shrink: 0;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 24px 0;
            margin-top: 52px;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
            margin-bottom: 0;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            :root {
                --space-section: 76px;
            }

            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }

            .step-arrow {
                display: none;
            }

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

            .category-hero h1 {
                font-size: 36px;
            }
        }

        @media (max-width: 768px) {
            .navbar-collapse {
                background: #fff;
                border-radius: 16px;
                padding: 18px;
                margin-top: 14px;
                box-shadow: 0 12px 32px rgba(31, 42, 68, 0.1);
                border: 1px solid var(--c-border);
            }

            .nav-link {
                padding: 10px 16px !important;
            }

            .nav-link.active::after {
                display: none;
            }

            .nav-cta {
                width: 100%;
                justify-content: center;
                margin-top: 10px;
            }

            .category-hero {
                padding: 68px 0 72px;
            }

            .category-hero h1 {
                font-size: 30px;
            }

            .category-hero .hero-sub {
                font-size: 15px;
            }

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

            .hero-btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }

            .section-head h2 {
                font-size: 26px;
            }

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

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

            .resource-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 14px;
            }

            .resource-link {
                align-self: flex-start;
            }

            .cta-section h2 {
                font-size: 28px;
            }

            .footer-brand {
                margin-bottom: 12px;
            }
        }

        @media (max-width: 520px) {
            :root {
                --space-section: 60px;
            }

            .category-hero h1 {
                font-size: 26px;
            }

            .section-head h2 {
                font-size: 22px;
            }

            .card-img-wrap {
                height: 180px;
            }

            .card-body {
                padding: 22px 18px;
            }

            .faq-header {
                padding: 18px 16px;
            }

            .faq-body {
                padding: 0 16px 18px 48px;
            }

            .cta-section h2 {
                font-size: 24px;
            }

            .btn-cta-white,
            .btn-cta-ghost {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }

            .footer-bottom {
                margin-top: 36px;
            }
        }