/* roulang page: index */
:root {
  --color-primary: #0a1628;
  --color-primary-light: #1a2d4a;
  --color-accent: #e8a838;
  --color-accent-hover: #d4952e;
  --color-accent-light: #fef3d6;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f8fb;
  --color-bg-dark: #0a1628;
  --color-text: #1a1a2e;
  --color-text-secondary: #5a6a7a;
  --color-text-light: #8a9aaa;
  --color-text-on-dark: #e8ecf0;
  --color-border: #e2e6ec;
  --color-border-light: #f0f2f5;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
  --shadow-xl: 0 24px 60px rgba(0,0,0,0.10);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; transition: color var(--transition); }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 768px) {
  .container { padding: 0 16px; }
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  height: var(--header-height);
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: var(--shadow-md); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #fff;
  font-weight: 700;
}
.nav { display: flex; align-items: center; gap: 32px; }
.nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 6px 0;
  position: relative;
  transition: color var(--transition);
}
.nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
  border-radius: 2px;
}
.nav a:hover { color: var(--color-primary); }
.nav a:hover::after { width: 100%; }
.nav a.active { color: var(--color-primary); font-weight: 600; }
.nav a.active::after { width: 100%; }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50px;
  font-weight: 600;
  font-size: 14px;
  transition: background var(--transition), transform var(--transition);
}
.nav-cta:hover { background: var(--color-accent-hover); color: #fff; transform: translateY(-1px); }
.nav-cta::after { display: none; }
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.menu-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 24px 20px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.35s ease, opacity 0.3s ease;
    pointer-events: none;
  }
  .nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav a { font-size: 17px; padding: 8px 0; width: 100%; }
  .nav-cta { width: 100%; justify-content: center; }
}

/* Hero */
.hero {
  position: relative;
  min-height: 620px;
  display: flex;
  align-items: center;
  margin-top: var(--header-height);
  background: var(--color-bg-dark);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  opacity: 0.35;
  transform: scale(1.05);
  transition: transform 0.6s ease;
}
.hero:hover .hero-bg { transform: scale(1); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,22,40,0.92) 30%, rgba(10,22,40,0.60) 70%, rgba(10,22,40,0.30) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 80px 0;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: rgba(232,168,56,0.15);
  border: 1px solid rgba(232,168,56,0.25);
  border-radius: 50px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  color: #ffffff;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero h1 span { color: var(--color-accent); }
.hero p {
  font-size: 18px;
  color: rgba(255,255,255,0.75);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 560px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent-hover); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,168,56,0.3); }
.btn-outline-light {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.3);
}
.btn-outline-light:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-2px); }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat h3 { font-size: 32px; font-weight: 700; color: #fff; line-height: 1.2; }
.hero-stat h3 span { color: var(--color-accent); }
.hero-stat p { font-size: 14px; color: rgba(255,255,255,0.5); margin-bottom: 0; }
@media (max-width: 768px) {
  .hero { min-height: 480px; }
  .hero h1 { font-size: 32px; }
  .hero p { font-size: 16px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stat h3 { font-size: 24px; }
}
@media (max-width: 520px) {
  .hero h1 { font-size: 26px; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}

/* Section Common */
.section {
  padding: 80px 0;
}
.section-alt { background: var(--color-bg-alt); }
.section-dark {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}
.section-header {
  text-align: center;
  margin-bottom: 52px;
}
.section-header h2 {
  font-size: 34px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}
.section-dark .section-header h2 { color: #ffffff; }
.section-header p {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
}
.section-dark .section-header p { color: rgba(255,255,255,0.6); }
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--color-accent-light);
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.section-dark .section-tag { background: rgba(232,168,56,0.15); color: var(--color-accent); }
@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .section-header h2 { font-size: 26px; }
  .section-header p { font-size: 15px; }
}

/* Features / Intro */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.intro-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  position: relative;
}
.intro-image img { width: 100%; height: auto; display: block; }
.intro-image::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.05);
  pointer-events: none;
}
.intro-text h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}
.intro-text p {
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  font-size: 16px;
  line-height: 1.8;
}
.intro-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}
.intro-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--color-text);
}
.intro-feature .icon {
  width: 28px;
  height: 28px;
  background: var(--color-accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 14px;
  flex-shrink: 0;
}
@media (max-width: 768px) {
  .intro-grid { grid-template-columns: 1fr; gap: 32px; }
  .intro-text h3 { font-size: 22px; }
  .intro-features { grid-template-columns: 1fr; }
}

/* Categories / Cards */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.cat-card {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
  cursor: pointer;
}
.cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.cat-card-img {
  height: 180px;
  overflow: hidden;
  position: relative;
}
.cat-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.cat-card:hover .cat-card-img img { transform: scale(1.05); }
.cat-card-img .cat-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 4px 12px;
  background: rgba(10,22,40,0.75);
  backdrop-filter: blur(4px);
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
}
.cat-card-body { padding: 20px; }
.cat-card-body h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-primary);
}
.cat-card-body p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}
.cat-card-body .cat-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  transition: gap var(--transition);
}
.cat-card:hover .cat-link { gap: 8px; }
@media (max-width: 768px) {
  .cat-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .cat-grid { grid-template-columns: 1fr; }
}

/* Latest Posts (CMS) */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.post-card {
  display: flex;
  gap: 20px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
}
.post-card:hover { box-shadow: var(--shadow-md); border-color: transparent; transform: translateY(-2px); }
.post-card-thumb {
  width: 120px;
  height: 90px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
}
.post-card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.post-card-body { flex: 1; min-width: 0; }
.post-card-body h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card-body h4 a { color: inherit; }
.post-card-body h4 a:hover { color: var(--color-accent); }
.post-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 6px;
}
.post-card-meta .cat-tag {
  padding: 2px 10px;
  background: var(--color-accent-light);
  border-radius: 50px;
  color: var(--color-accent);
  font-weight: 500;
  font-size: 12px;
}
.post-card-body p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.posts-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px;
  color: var(--color-text-light);
  font-size: 16px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
}
@media (max-width: 768px) {
  .posts-grid { grid-template-columns: 1fr; }
  .post-card { flex-direction: column; }
  .post-card-thumb { width: 100%; height: 180px; }
}

/* Stats / Data */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-card {
  text-align: center;
  padding: 32px 20px;
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.06);
  transition: all var(--transition);
}
.stat-card:hover { background: rgba(255,255,255,0.08); border-color: rgba(232,168,56,0.2); }
.stat-card .number {
  font-size: 40px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.2;
  margin-bottom: 8px;
}
.stat-card .label {
  font-size: 15px;
  color: rgba(255,255,255,0.6);
  font-weight: 500;
}
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-card .number { font-size: 32px; }
}
@media (max-width: 520px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
}

/* Content Blocks */
.content-blocks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.content-block {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
}
.content-block:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.content-block .icon-box {
  width: 48px;
  height: 48px;
  background: var(--color-accent-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--color-accent);
  flex-shrink: 0;
}
.content-block h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}
.content-block p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}
@media (max-width: 768px) {
  .content-blocks { grid-template-columns: 1fr; }
}

/* FAQ */
.faq-list {
  max-width: 780px;
  margin: 0 auto;
}
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 20px 0;
}
.faq-item:first-child { padding-top: 0; }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  gap: 16px;
  user-select: none;
}
.faq-question .icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--color-text-secondary);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-question .icon { transform: rotate(45deg); color: var(--color-accent); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.7;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding-top: 14px;
}
@media (max-width: 768px) {
  .faq-question { font-size: 15px; }
}

/* CTA */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(232,168,56,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.cta-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}
.cta-inner h2 {
  font-size: 34px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}
.cta-inner p {
  font-size: 17px;
  color: rgba(255,255,255,0.65);
  margin-bottom: 32px;
  line-height: 1.7;
}
.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn-cta {
  padding: 16px 40px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-cta:hover { background: var(--color-accent-hover); transform: translateY(-2px); box-shadow: 0 12px 32px rgba(232,168,56,0.35); }
.btn-ghost-light {
  padding: 16px 40px;
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.25);
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-ghost-light:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-2px); }
@media (max-width: 768px) {
  .cta-inner h2 { font-size: 26px; }
  .cta-actions { flex-direction: column; align-items: center; }
  .btn-cta, .btn-ghost-light { width: 100%; max-width: 320px; text-align: center; }
}

/* Footer */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  padding: 56px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  line-height: 1.7;
  max-width: 320px;
}
.footer-col h5 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 10px;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--color-accent); }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(255,255,255,0.35);
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom a { color: rgba(255,255,255,0.35); }
.footer-bottom a:hover { color: var(--color-accent); }
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* Mobile menu overlay */
.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.mobile-overlay.show { opacity: 1; pointer-events: auto; }

/* Scroll to top */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  z-index: 99;
}
.scroll-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.scroll-top:hover { background: var(--color-accent); transform: translateY(-4px); box-shadow: var(--shadow-lg); }

/* Utility */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.gap-16 { gap: 16px; }

/* roulang page: article */
/* ===== 设计变量 ===== */
    :root {
        --primary: #1e3a5f;
        --primary-light: #2a4f7a;
        --primary-dark: #0f2a47;
        --accent: #e67e22;
        --accent-hover: #d35400;
        --accent-light: #f39c12;
        --bg: #f5f7fa;
        --bg-card: #ffffff;
        --bg-alt: #eef1f5;
        --text: #1a1a2e;
        --text-light: #5a6a7e;
        --text-muted: #8a9aa8;
        --border: #e2e8f0;
        --radius: 12px;
        --radius-sm: 8px;
        --radius-lg: 20px;
        --shadow: 0 4px 20px rgba(0,0,0,0.06);
        --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
        --transition: 0.3s cubic-bezier(.4,0,.2,1);
        --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        --container: 1200px;
        --nav-height: 72px;
    }
    /* ===== Reset & Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
        font-family: var(--font);
        font-size: 16px;
        line-height: 1.7;
        color: var(--text);
        background: var(--bg);
        min-height: 100vh;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--accent); }
    button, input, textarea { font-family: inherit; font-size: 1rem; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--primary-dark); }
    .container {
        max-width: var(--container);
        margin: 0 auto;
        padding: 0 24px;
    }
    /* ===== Header / Nav ===== */
    .header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background: rgba(255,255,255,0.92);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        border-bottom: 1px solid var(--border);
        height: var(--nav-height);
        display: flex;
        align-items: center;
        transition: var(--transition);
    }
    .header .container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
    }
    .logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 1.5rem;
        font-weight: 800;
        color: var(--primary);
        letter-spacing: -0.5px;
    }
    .logo-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        background: var(--primary);
        color: #fff;
        border-radius: var(--radius-sm);
        font-size: 1.2rem;
        font-weight: 700;
    }
    .logo span:not(.logo-icon) { color: var(--accent); }
    .nav {
        display: flex;
        align-items: center;
        gap: 32px;
    }
    .nav a {
        font-size: 0.95rem;
        font-weight: 500;
        color: var(--text-light);
        padding: 6px 0;
        position: relative;
        transition: var(--transition);
        letter-spacing: 0.2px;
    }
    .nav a::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 0;
        width: 0;
        height: 2.5px;
        background: var(--accent);
        border-radius: 4px;
        transition: var(--transition);
    }
    .nav a:hover { color: var(--primary); }
    .nav a:hover::after { width: 100%; }
    .nav a.active { color: var(--primary); font-weight: 600; }
    .nav a.active::after { width: 100%; background: var(--accent); }
    .nav .nav-cta {
        background: var(--accent);
        color: #fff;
        padding: 10px 22px;
        border-radius: 50px;
        font-weight: 600;
        font-size: 0.9rem;
        letter-spacing: 0.3px;
        transition: var(--transition);
    }
    .nav .nav-cta::after { display: none; }
    .nav .nav-cta:hover { background: var(--accent-hover); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(230,126,34,0.35); }
    .nav-toggle {
        display: none;
        background: none;
        border: none;
        font-size: 1.6rem;
        color: var(--primary);
        cursor: pointer;
        padding: 4px;
    }
    /* ===== Hero / Article Banner ===== */
    .article-hero {
        padding: 140px 0 60px;
        background: linear-gradient(135deg, rgba(30,58,95,0.92) 0%, rgba(15,42,71,0.88) 100%), url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
        color: #fff;
        text-align: center;
        position: relative;
    }
    .article-hero .breadcrumb {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        font-size: 0.9rem;
        color: rgba(255,255,255,0.7);
        margin-bottom: 24px;
        flex-wrap: wrap;
    }
    .article-hero .breadcrumb a { color: rgba(255,255,255,0.8); }
    .article-hero .breadcrumb a:hover { color: #fff; }
    .article-hero .breadcrumb span { color: var(--accent-light); }
    .article-hero h1 {
        font-size: 2.8rem;
        font-weight: 800;
        color: #fff;
        max-width: 900px;
        margin: 0 auto 20px;
        line-height: 1.25;
        letter-spacing: -0.3px;
    }
    .article-hero .meta {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 24px;
        font-size: 0.95rem;
        color: rgba(255,255,255,0.75);
        flex-wrap: wrap;
    }
    .article-hero .meta i { margin-right: 6px; }
    .article-hero .meta .category-tag {
        background: var(--accent);
        color: #fff;
        padding: 4px 16px;
        border-radius: 50px;
        font-size: 0.8rem;
        font-weight: 600;
        letter-spacing: 0.3px;
    }
    /* ===== Article Content ===== */
    .article-main {
        padding: 48px 0 64px;
    }
    .article-layout {
        display: grid;
        grid-template-columns: 1fr 320px;
        gap: 48px;
        align-items: start;
    }
    .article-body {
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 40px 48px;
        overflow: hidden;
    }
    .article-body .featured-image {
        border-radius: var(--radius-sm);
        margin-bottom: 32px;
        width: 100%;
        max-height: 460px;
        object-fit: cover;
        box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    }
    .article-body .content {
        font-size: 1.05rem;
        line-height: 1.85;
        color: var(--text);
    }
    .article-body .content p {
        margin-bottom: 1.4em;
    }
    .article-body .content h2, .article-body .content h3 {
        margin-top: 1.6em;
        margin-bottom: 0.6em;
        color: var(--primary-dark);
    }
    .article-body .content h2 { font-size: 1.6rem; }
    .article-body .content h3 { font-size: 1.3rem; }
    .article-body .content ul, .article-body .content ol {
        padding-left: 1.8em;
        margin-bottom: 1.4em;
    }
    .article-body .content ul li { list-style: disc; margin-bottom: 0.3em; }
    .article-body .content ol li { list-style: decimal; margin-bottom: 0.3em; }
    .article-body .content blockquote {
        border-left: 4px solid var(--accent);
        padding: 16px 24px;
        margin: 1.6em 0;
        background: var(--bg-alt);
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        color: var(--text-light);
        font-style: italic;
    }
    .article-body .content img {
        border-radius: var(--radius-sm);
        margin: 1.6em auto;
        box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }
    .article-body .content a { color: var(--accent); text-decoration: underline; }
    .article-body .content a:hover { color: var(--accent-hover); }
    .article-body .tags {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 36px;
        padding-top: 28px;
        border-top: 1px solid var(--border);
    }
    .article-body .tags .tag {
        background: var(--bg-alt);
        color: var(--text-light);
        padding: 6px 18px;
        border-radius: 50px;
        font-size: 0.85rem;
        font-weight: 500;
        transition: var(--transition);
    }
    .article-body .tags .tag:hover { background: var(--accent); color: #fff; }
    /* ===== Sidebar ===== */
    .article-sidebar {
        display: flex;
        flex-direction: column;
        gap: 32px;
        position: sticky;
        top: calc(var(--nav-height) + 32px);
    }
    .sidebar-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 28px 24px;
    }
    .sidebar-card h4 {
        font-size: 1.1rem;
        margin-bottom: 16px;
        padding-bottom: 12px;
        border-bottom: 2px solid var(--accent);
        display: inline-block;
    }
    .sidebar-card .side-list {
        display: flex;
        flex-direction: column;
        gap: 14px;
    }
    .sidebar-card .side-list a {
        display: flex;
        align-items: flex-start;
        gap: 12px;
        font-size: 0.9rem;
        color: var(--text-light);
        line-height: 1.4;
        transition: var(--transition);
    }
    .sidebar-card .side-list a:hover { color: var(--accent); }
    .sidebar-card .side-list a i { color: var(--accent); font-size: 0.8rem; margin-top: 4px; }
    .sidebar-card .side-cta {
        display: inline-block;
        margin-top: 16px;
        background: var(--primary);
        color: #fff;
        padding: 10px 24px;
        border-radius: 50px;
        font-size: 0.9rem;
        font-weight: 600;
        text-align: center;
        transition: var(--transition);
    }
    .sidebar-card .side-cta:hover { background: var(--primary-light); color: #fff; transform: translateY(-2px); }
    /* ===== Prev / Next ===== */
    .post-nav {
        margin-top: 48px;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    .post-nav a {
        display: flex;
        flex-direction: column;
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 24px 28px;
        transition: var(--transition);
        border: 1px solid var(--border);
    }
    .post-nav a:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); border-color: var(--accent); }
    .post-nav .label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; font-weight: 600; margin-bottom: 6px; }
    .post-nav .title { font-weight: 600; color: var(--primary); font-size: 1rem; }
    .post-nav a:hover .title { color: var(--accent); }
    .post-nav .next { text-align: right; }
    /* ===== Related Posts ===== */
    .related-section {
        margin-top: 56px;
        padding-top: 40px;
        border-top: 1px solid var(--border);
    }
    .related-section h3 {
        font-size: 1.5rem;
        margin-bottom: 28px;
        color: var(--primary-dark);
        display: flex;
        align-items: center;
        gap: 12px;
    }
    .related-section h3 i { color: var(--accent); }
    .related-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }
    .related-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        overflow: hidden;
        transition: var(--transition);
        border: 1px solid var(--border);
    }
    .related-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-6px); }
    .related-card img {
        width: 100%;
        height: 160px;
        object-fit: cover;
    }
    .related-card .info {
        padding: 16px 18px 20px;
    }
    .related-card .info .cat {
        font-size: 0.75rem;
        color: var(--accent);
        font-weight: 600;
        letter-spacing: 0.5px;
        text-transform: uppercase;
    }
    .related-card .info h4 {
        font-size: 0.95rem;
        font-weight: 600;
        margin: 6px 0 8px;
        color: var(--primary-dark);
        line-height: 1.4;
    }
    .related-card .info h4 a { color: var(--primary-dark); }
    .related-card .info h4 a:hover { color: var(--accent); }
    .related-card .info .date {
        font-size: 0.8rem;
        color: var(--text-muted);
    }
    /* ===== CTA Section ===== */
    .article-cta {
        margin-top: 56px;
        background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
        border-radius: var(--radius-lg);
        padding: 48px 56px;
        text-align: center;
        color: #fff;
        position: relative;
        overflow: hidden;
    }
    .article-cta::before {
        content: '';
        position: absolute;
        top: -50%;
        right: -30%;
        width: 400px;
        height: 400px;
        background: rgba(230,126,34,0.12);
        border-radius: 50%;
    }
    .article-cta h3 { font-size: 1.8rem; color: #fff; margin-bottom: 12px; }
    .article-cta p { font-size: 1.05rem; color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto 28px; }
    .article-cta .cta-btn {
        display: inline-block;
        background: var(--accent);
        color: #fff;
        padding: 14px 40px;
        border-radius: 50px;
        font-weight: 700;
        font-size: 1rem;
        letter-spacing: 0.5px;
        transition: var(--transition);
    }
    .article-cta .cta-btn:hover { background: var(--accent-hover); color: #fff; transform: translateY(-4px); box-shadow: 0 12px 32px rgba(230,126,34,0.4); }
    /* ===== Not Found ===== */
    .not-found-box {
        text-align: center;
        padding: 80px 24px;
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
    }
    .not-found-box i { font-size: 4rem; color: var(--text-muted); margin-bottom: 20px; }
    .not-found-box h2 { font-size: 1.8rem; color: var(--primary); margin-bottom: 12px; }
    .not-found-box p { color: var(--text-light); margin-bottom: 24px; }
    .not-found-box .back-home {
        display: inline-block;
        background: var(--accent);
        color: #fff;
        padding: 12px 32px;
        border-radius: 50px;
        font-weight: 600;
    }
    .not-found-box .back-home:hover { background: var(--accent-hover); color: #fff; }
    /* ===== Footer ===== */
    .footer {
        background: var(--primary-dark);
        color: rgba(255,255,255,0.8);
        padding: 60px 0 32px;
        margin-top: 80px;
    }
    .footer .container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        margin-bottom: 40px;
    }
    .footer-brand .logo { color: #fff; font-size: 1.4rem; margin-bottom: 16px; }
    .footer-brand .logo .logo-icon { background: var(--accent); }
    .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 300px; }
    .footer-col h5 { font-size: 0.95rem; font-weight: 700; color: #fff; margin-bottom: 16px; letter-spacing: 0.5px; }
    .footer-col a {
        display: block;
        color: rgba(255,255,255,0.6);
        font-size: 0.9rem;
        padding: 5px 0;
        transition: var(--transition);
    }
    .footer-col a:hover { color: var(--accent); padding-left: 6px; }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,0.1);
        padding-top: 24px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
        font-size: 0.85rem;
        color: rgba(255,255,255,0.5);
    }
    .footer-bottom a { color: rgba(255,255,255,0.6); }
    .footer-bottom a:hover { color: var(--accent); }
    /* ===== Mobile Nav ===== */
    @media (max-width: 1024px) {
        .article-layout { grid-template-columns: 1fr; }
        .article-sidebar { position: static; }
        .related-grid { grid-template-columns: repeat(2, 1fr); }
        .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    }
    @media (max-width: 768px) {
        :root { --nav-height: 64px; }
        .nav { display: none; }
        .nav-toggle { display: block; }
        .nav.open {
            display: flex;
            flex-direction: column;
            background: var(--bg-card);
            position: absolute;
            top: var(--nav-height);
            left: 0;
            right: 0;
            padding: 20px 28px;
            gap: 16px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            border-bottom: 2px solid var(--border);
            align-items: stretch;
        }
        .nav.open a { padding: 10px 0; }
        .nav.open .nav-cta { text-align: center; }
        .article-hero { padding: 120px 0 40px; }
        .article-hero h1 { font-size: 1.8rem; }
        .article-body { padding: 24px 20px; }
        .post-nav { grid-template-columns: 1fr; }
        .related-grid { grid-template-columns: 1fr; }
        .article-cta { padding: 32px 24px; }
        .article-cta h3 { font-size: 1.4rem; }
        .footer-grid { grid-template-columns: 1fr; gap: 24px; }
        .footer-bottom { flex-direction: column; text-align: center; }
    }
    @media (max-width: 520px) {
        .article-hero h1 { font-size: 1.4rem; }
        .article-hero .meta { gap: 12px; font-size: 0.85rem; flex-direction: column; }
        .article-body .content { font-size: 0.95rem; }
        .sidebar-card { padding: 20px 16px; }
        .article-cta h3 { font-size: 1.2rem; }
        .article-cta .cta-btn { padding: 12px 28px; font-size: 0.9rem; }
    }
    /* ===== Utilities ===== */
    .text-accent { color: var(--accent); }
    .mb-1 { margin-bottom: 0.5rem; }
    .mb-2 { margin-bottom: 1rem; }
    .mb-3 { margin-bottom: 1.5rem; }
    .mb-4 { margin-bottom: 2rem; }
    .mt-2 { margin-top: 1rem; }
    .mt-3 { margin-top: 1.5rem; }
    .text-center { text-align: center; }
    .sr-only { position:absolute; width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);border:0; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f1f33;
            --accent: #e8642e;
            --accent-light: #f07a4a;
            --accent-dark: #c94d1a;
            --bg-body: #f6f8fb;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-hero: #0f1f33;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-muted: #7a8a9a;
            --text-light: #f0f4f8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f0f2f5;
            --shadow-sm: 0 2px 8px rgba(26, 58, 92, 0.06);
            --shadow-md: 0 6px 24px rgba(26, 58, 92, 0.08);
            --shadow-lg: 0 12px 40px rgba(26, 58, 92, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 60px;
            --spacing-2xl: 80px;
            --max-width: 1200px;
            --header-height: 72px;
            --font-sans: 'Inter', -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset / Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--accent);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 2px;
        }
        ul,
        ol {
            list-style: none;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }
        .section {
            padding: var(--spacing-xl) 0;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-xs);
            letter-spacing: -0.02em;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin-bottom: var(--spacing-lg);
            line-height: 1.6;
        }
        .text-center {
            text-align: center;
        }
        .mx-auto {
            margin-left: auto;
            margin-right: auto;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        /* ===== 导航 ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .header.scrolled {
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
            text-decoration: none;
        }
        .logo:hover {
            color: var(--primary);
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 1.2rem;
            font-weight: 800;
            flex-shrink: 0;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: var(--spacing-xs);
        }
        .nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            position: relative;
            text-decoration: none;
        }
        .nav a:hover {
            color: var(--primary);
            background: rgba(26, 58, 92, 0.04);
        }
        .nav a.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 18px;
            right: 18px;
            height: 2.5px;
            background: var(--accent);
            border-radius: 2px;
        }
        .nav a.nav-cta {
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            padding: 8px 22px;
            border-radius: var(--radius-sm);
            margin-left: 8px;
        }
        .nav a.nav-cta:hover {
            background: var(--accent-light);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(232, 100, 46, 0.3);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero ===== */
        .hero-cat {
            position: relative;
            padding: var(--spacing-2xl) 0 var(--spacing-xl);
            background: var(--bg-hero);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            min-height: 340px;
            display: flex;
            align-items: center;
            isolation: isolate;
        }
        .hero-cat::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 31, 51, 0.88) 0%, rgba(26, 58, 92, 0.72) 100%);
            z-index: 0;
        }
        .hero-cat .container {
            position: relative;
            z-index: 1;
        }
        .hero-cat-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(232, 100, 46, 0.2);
            color: var(--accent-light);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 20px;
            border: 1px solid rgba(232, 100, 46, 0.25);
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.02em;
        }
        .hero-cat h1 {
            font-size: 3rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.15;
            letter-spacing: -0.03em;
            margin-bottom: var(--spacing-sm);
            max-width: 720px;
        }
        .hero-cat p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 580px;
            line-height: 1.7;
            margin-bottom: var(--spacing-md);
        }
        .hero-cat-meta {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-md);
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.9rem;
        }
        .hero-cat-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .hero-cat-meta i {
            color: var(--accent);
        }

        /* ===== 统计条 ===== */
        .stats-bar {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            padding: var(--spacing-md) 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
            text-align: center;
        }
        .stats-item h3 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.02em;
        }
        .stats-item p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 2px;
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }
        .card-grid.cols-2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--border);
        }
        .card-img {
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--border-light);
            position: relative;
        }
        .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img img {
            transform: scale(1.04);
        }
        .card-img .tag {
            position: absolute;
            top: 12px;
            left: 12px;
        }
        .card-body {
            padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
            line-height: 1.4;
            flex: 1;
        }
        .card-body h3 a {
            color: inherit;
            text-decoration: none;
        }
        .card-body h3 a:hover {
            color: var(--primary-light);
        }
        .card-body p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: var(--spacing-sm);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card-meta {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 0.8rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border-light);
            padding-top: var(--spacing-sm);
            margin-top: auto;
        }
        .card-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        /* ===== 标签 ===== */
        .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 20px;
            background: var(--border-light);
            color: var(--text-secondary);
            letter-spacing: 0.02em;
            transition: all var(--transition);
        }
        .tag-accent {
            background: rgba(232, 100, 46, 0.12);
            color: var(--accent-dark);
        }
        .tag-blue {
            background: rgba(26, 58, 92, 0.08);
            color: var(--primary);
        }
        .tag-green {
            background: rgba(46, 160, 100, 0.12);
            color: #1a7a4a;
        }
        .tag:hover {
            opacity: 0.8;
        }

        /* ===== 特色区块 ===== */
        .featured-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-lg);
            align-items: center;
        }
        .featured-img {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            aspect-ratio: 4 / 3;
            background: var(--border-light);
        }
        .featured-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .featured-content h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.02em;
        }
        .featured-content p {
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: var(--spacing-md);
        }
        .featured-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-bottom: var(--spacing-md);
        }
        .featured-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--text-primary);
        }
        .featured-list li i {
            color: var(--accent);
            font-size: 0.85rem;
            margin-top: 4px;
            flex-shrink: 0;
        }

        /* ===== 知识卡片 ===== */
        .knowledge-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }
        .k-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            text-align: center;
        }
        .k-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--border);
        }
        .k-card-icon {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(26, 58, 92, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto var(--spacing-sm);
            font-size: 1.4rem;
            color: var(--primary);
            transition: all var(--transition);
        }
        .k-card:hover .k-card-icon {
            background: var(--primary);
            color: #fff;
        }
        .k-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .k-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--spacing-sm) var(--spacing-md);
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
            border: none;
        }
        .faq-question:hover {
            background: rgba(26, 58, 92, 0.02);
        }
        .faq-question i {
            font-size: 0.8rem;
            color: var(--text-muted);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 var(--spacing-md);
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 var(--spacing-md) var(--spacing-md);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding: var(--spacing-2xl) 0;
            text-align: center;
            isolation: isolate;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(15, 31, 51, 0.82);
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.02em;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 540px;
            margin: 0 auto var(--spacing-md);
        }
        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            text-decoration: none;
        }
        .cta-btn:hover {
            background: var(--accent-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(232, 100, 46, 0.35);
        }
        .cta-btn-outline {
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.3);
            color: #fff;
            margin-left: 12px;
        }
        .cta-btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.06);
            color: #fff;
            box-shadow: none;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: var(--spacing-xl) 0 var(--spacing-md);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: var(--spacing-sm);
            font-size: 1.3rem;
        }
        .footer-brand .logo .logo-icon {
            background: var(--accent);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h5 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.03em;
            text-transform: uppercase;
        }
        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            padding: 4px 0;
            transition: color var(--transition);
            text-decoration: none;
        }
        .footer-col a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: var(--spacing-md);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
            flex-wrap: wrap;
            gap: var(--spacing-sm);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.55);
            text-decoration: none;
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== 按钮通用 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 24px;
            font-weight: 600;
            font-size: 0.95rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            text-decoration: none;
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-light);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(26, 58, 92, 0.25);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-1px);
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            padding: var(--spacing-sm) 0;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--text-secondary);
        }
        .breadcrumb i {
            font-size: 0.6rem;
            color: var(--text-muted);
        }

        /* ===== 子分类导航 ===== */
        .subnav {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            padding: var(--spacing-md) 0;
        }
        .subnav a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 18px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--bg-white);
            border-radius: 20px;
            border: 1px solid var(--border);
            transition: all var(--transition);
            text-decoration: none;
        }
        .subnav a:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(26, 58, 92, 0.03);
        }
        .subnav a.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        /* ===== 分隔线 ===== */
        .divider {
            height: 1px;
            background: var(--border);
            margin: var(--spacing-lg) 0;
        }

        /* ===== 空状态 ===== */
        .empty-state {
            text-align: center;
            padding: var(--spacing-2xl) 0;
            color: var(--text-muted);
        }
        .empty-state i {
            font-size: 3rem;
            margin-bottom: var(--spacing-sm);
            opacity: 0.4;
        }
        .empty-state p {
            font-size: 1.1rem;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .knowledge-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-md);
            }
            .hero-cat h1 {
                font-size: 2.4rem;
            }
            .featured-row {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .featured-img {
                aspect-ratio: 16 / 9;
                order: -1;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-sm);
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
                --spacing-xl: 40px;
                --spacing-2xl: 50px;
            }
            .nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                padding: var(--spacing-sm) var(--spacing-md);
                gap: 4px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                pointer-events: none;
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
                border-radius: var(--radius-sm);
            }
            .nav a.active::after {
                display: none;
            }
            .nav a.active {
                background: rgba(26, 58, 92, 0.06);
            }
            .nav a.nav-cta {
                margin-left: 0;
                margin-top: 6px;
                text-align: center;
                justify-content: center;
            }
            .nav-toggle {
                display: flex;
            }
            .hero-cat {
                min-height: 260px;
                padding: var(--spacing-lg) 0;
            }
            .hero-cat h1 {
                font-size: 1.8rem;
            }
            .hero-cat p {
                font-size: 1rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-sm);
            }
            .card-grid.cols-2 {
                grid-template-columns: 1fr;
            }
            .knowledge-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .stats-item h3 {
                font-size: 1.5rem;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .cta-btn {
                width: 100%;
                justify-content: center;
            }
            .cta-btn-outline {
                margin-left: 0;
                margin-top: 10px;
            }
            .subnav {
                flex-wrap: nowrap;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                padding-bottom: var(--spacing-xs);
            }
            .subnav a {
                flex-shrink: 0;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
        }
        @media (max-width: 520px) {
            .hero-cat h1 {
                font-size: 1.5rem;
            }
            .hero-cat-meta {
                flex-direction: column;
                gap: 6px;
                font-size: 0.85rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .stats-item h3 {
                font-size: 1.3rem;
            }
            .section {
                padding: var(--spacing-lg) 0;
            }
            .container {
                padding: 0 var(--spacing-sm);
            }
            .card-body {
                padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-md);
            }
        }

        /* ===== 辅助 ===== */
        .gap-sm {
            gap: var(--spacing-sm);
        }
        .gap-md {
            gap: var(--spacing-md);
        }
        .mt-sm {
            margin-top: var(--spacing-sm);
        }
        .mt-md {
            margin-top: var(--spacing-md);
        }
        .mt-lg {
            margin-top: var(--spacing-lg);
        }
        .mb-sm {
            margin-bottom: var(--spacing-sm);
        }
        .mb-md {
            margin-bottom: var(--spacing-md);
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            display: flex;
            flex-wrap: wrap;
        }
        .text-muted {
            color: var(--text-muted);
        }