/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --primary: #0f172a;
  --primary-light: #1e293b;
  --primary-dark: #070b14;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #dbeafe;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --gold: #f59e0b;
  --gold-hover: #d97706;
  --surface: #ffffff;
  --surface-alt: #f1f5f9;
  --surface-card: #ffffff;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-weak: #94a3b8;
  --text-on-dark: #f8fafc;
  --text-on-dark-secondary: #cbd5e1;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 14px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 40px rgba(15, 23, 42, 0.10);
  --shadow-xl: 0 20px 60px rgba(15, 23, 42, 0.12);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --sidebar-width: 240px;
  --header-height: 64px;
  --max-width: 1200px;
}

/* ===== 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);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 600; color: var(--text); }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.4rem); }
h4 { font-size: 1.1rem; }
p { color: var(--text-secondary); margin-bottom: 1em; }
p:last-child { margin-bottom: 0; }
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section-padding { padding: 80px 0; }
.section-padding-sm { padding: 56px 0; }

/* ===== App Shell 布局 ===== */
.app-shell { display: flex; min-height: 100vh; }

/* ===== 左侧导航 (Sidebar) ===== */
.sidebar {
  position: fixed; top: 0; left: 0; width: var(--sidebar-width); height: 100vh;
  background: var(--primary); color: var(--text-on-dark);
  display: flex; flex-direction: column; z-index: 1000;
  transition: transform var(--transition), box-shadow var(--transition);
  overflow-y: auto;
}
.sidebar-logo {
  padding: 24px 20px 20px; border-bottom: 1px solid rgba(255,255,255,0.08);
  display: flex; align-items: center; gap: 12px;
}
.sidebar-logo a {
  font-size: 1.5rem; font-weight: 700; color: var(--text-on-dark);
  letter-spacing: -0.02em; display: flex; align-items: center; gap: 10px;
}
.sidebar-logo a i { color: var(--accent); font-size: 1.6rem; }
.sidebar-logo .logo-badge {
  font-size: 0.6rem; background: var(--accent); color: #fff; padding: 2px 8px;
  border-radius: 20px; font-weight: 500; letter-spacing: 0.3px; margin-left: 4px;
}
.sidebar-nav { flex: 1; padding: 16px 12px; display: flex; flex-direction: column; gap: 4px; }
.sidebar-nav .nav-item {
  display: flex; align-items: center; gap: 12px; padding: 12px 16px;
  border-radius: var(--radius-md); color: var(--text-on-dark-secondary);
  font-size: 0.95rem; font-weight: 500; transition: all var(--transition);
  position: relative;
}
.sidebar-nav .nav-item i { width: 20px; text-align: center; font-size: 1.1rem; }
.sidebar-nav .nav-item:hover { background: rgba(255,255,255,0.08); color: var(--text-on-dark); }
.sidebar-nav .nav-item.active {
  background: var(--accent); color: #fff; box-shadow: 0 4px 16px rgba(59,130,246,0.3);
}
.sidebar-nav .nav-item.active::before {
  content: ''; position: absolute; left: -12px; top: 50%; transform: translateY(-50%);
  width: 4px; height: 24px; background: var(--accent); border-radius: 0 4px 4px 0;
}
.sidebar-nav .nav-divider {
  height: 1px; background: rgba(255,255,255,0.06); margin: 12px 16px;
}
.sidebar-nav .nav-label {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1px;
  color: var(--text-weak); padding: 8px 16px 4px; font-weight: 600;
}
.sidebar-footer {
  padding: 16px 20px; border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.75rem; color: var(--text-weak); text-align: center;
}

/* ===== 主内容区 ===== */
.main-content {
  flex: 1; margin-left: var(--sidebar-width); min-height: 100vh;
  background: var(--surface); position: relative; z-index: 1;
}

/* ===== 移动端顶部栏 ===== */
.mobile-header {
  display: none; position: fixed; top: 0; left: 0; right: 0; z-index: 999;
  height: var(--header-height); background: var(--primary); padding: 0 20px;
  align-items: center; justify-content: space-between;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.mobile-header .mobile-logo { font-size: 1.3rem; font-weight: 700; color: var(--text-on-dark); display: flex; align-items: center; gap: 8px; }
.mobile-header .mobile-logo i { color: var(--accent); }
.mobile-header .hamburger { color: var(--text-on-dark); font-size: 1.4rem; padding: 8px; border-radius: var(--radius-sm); }
.mobile-header .hamburger:hover { background: rgba(255,255,255,0.1); }

/* 移动端遮罩 */
.sidebar-overlay {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  z-index: 999; opacity: 0; transition: opacity var(--transition);
  pointer-events: none;
}
.sidebar-overlay.open { opacity: 1; pointer-events: auto; }

/* ===== Hero 首屏 ===== */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 60%, #1a2a4a 100%);
  padding: 100px 0 80px; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -40%; right: -20%; width: 600px; height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.hero::after {
  content: ''; position: absolute; bottom: -30%; left: -10%; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(245,158,11,0.08) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.hero .container { position: relative; z-index: 2; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-content { max-width: 580px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12); padding: 6px 16px; border-radius: 40px;
  font-size: 0.8rem; color: var(--text-on-dark-secondary); margin-bottom: 24px;
  backdrop-filter: blur(4px);
}
.hero-badge i { color: var(--gold); font-size: 0.7rem; }
.hero h1 { color: var(--text-on-dark); margin-bottom: 20px; }
.hero h1 .highlight { background: linear-gradient(135deg, var(--accent), #60a5fa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.15rem; color: var(--text-on-dark-secondary); margin-bottom: 32px; max-width: 480px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual {
  display: flex; justify-content: center; align-items: center; position: relative;
}
.hero-visual-card {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl); padding: 32px; backdrop-filter: blur(8px);
  width: 100%; max-width: 480px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.hero-visual-card .card-item {
  background: rgba(255,255,255,0.06); border-radius: var(--radius-md); padding: 20px 16px;
  text-align: center; transition: all var(--transition);
}
.hero-visual-card .card-item:hover { background: rgba(255,255,255,0.10); transform: translateY(-2px); }
.hero-visual-card .card-item i { font-size: 1.8rem; color: var(--accent); margin-bottom: 8px; }
.hero-visual-card .card-item span { display: block; font-size: 0.85rem; color: var(--text-on-dark-secondary); }
.hero-visual-card .card-item .num { font-size: 1.6rem; font-weight: 700; color: var(--text-on-dark); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 10px; padding: 14px 32px;
  border-radius: 50px; font-weight: 600; font-size: 1rem; transition: all var(--transition);
  border: none; cursor: pointer; text-align: center; line-height: 1.2;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 4px 20px rgba(59,130,246,0.3); }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 32px rgba(59,130,246,0.4); }
.btn-primary:active { transform: translateY(0); }
.btn-outline { background: transparent; color: var(--text-on-dark); border: 1.5px solid rgba(255,255,255,0.25); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: rgba(59,130,246,0.08); transform: translateY(-2px); }
.btn-gold { background: var(--gold); color: var(--primary); box-shadow: 0 4px 20px rgba(245,158,11,0.3); }
.btn-gold:hover { background: var(--gold-hover); transform: translateY(-2px); box-shadow: 0 8px 32px rgba(245,158,11,0.4); }
.btn-sm { padding: 10px 24px; font-size: 0.9rem; }
.btn-lg { padding: 18px 44px; font-size: 1.1rem; }

/* ===== 板块标题 ===== */
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 { margin-bottom: 16px; }
.section-header p { max-width: 600px; margin: 0 auto; font-size: 1.05rem; }
.section-header .sub-badge {
  display: inline-flex; align-items: center; gap: 6px; background: var(--accent-light);
  color: var(--accent); padding: 4px 16px; border-radius: 40px; font-size: 0.8rem;
  font-weight: 600; margin-bottom: 16px;
}

/* ===== 卡片系统 ===== */
.card {
  background: var(--surface-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border); padding: 28px 24px;
  transition: all var(--transition); box-shadow: var(--shadow-sm);
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: transparent; }
.card-icon { width: 52px; height: 52px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 1.4rem; margin-bottom: 16px; background: var(--accent-light); color: var(--accent); }
.card h3 { margin-bottom: 10px; }
.card p { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 0; }
.card .card-link { display: inline-flex; align-items: center; gap: 6px; color: var(--accent); font-weight: 500; font-size: 0.9rem; margin-top: 16px; }
.card .card-link:hover { gap: 10px; }

/* ===== 特色板块 ===== */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.feature-card { text-align: center; padding: 36px 24px; }
.feature-card .card-icon { margin: 0 auto 20px; width: 64px; height: 64px; border-radius: 50%; font-size: 1.6rem; }

/* ===== 分类入口 ===== */
.category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.category-card {
  display: flex; align-items: center; gap: 20px; padding: 24px;
  background: var(--surface-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border); transition: all var(--transition);
  box-shadow: var(--shadow-sm); cursor: pointer;
}
.category-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); border-color: transparent; }
.category-card .cat-icon { width: 56px; height: 56px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; background: var(--accent-light); color: var(--accent); flex-shrink: 0; }
.category-card .cat-info h4 { margin-bottom: 4px; font-size: 1.05rem; }
.category-card .cat-info p { font-size: 0.85rem; color: var(--text-weak); margin: 0; }
.category-card .cat-arrow { margin-left: auto; color: var(--text-weak); font-size: 1.1rem; transition: all var(--transition); }
.category-card:hover .cat-arrow { color: var(--accent); transform: translateX(4px); }

/* ===== 资讯列表 ===== */
.news-list { display: flex; flex-direction: column; gap: 16px; }
.news-item {
  display: flex; align-items: stretch; gap: 0; background: var(--surface-card);
  border-radius: var(--radius-lg); border: 1px solid var(--border);
  overflow: hidden; transition: all var(--transition); box-shadow: var(--shadow-sm);
}
.news-item:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); border-color: transparent; }
.news-item .news-date {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-width: 90px; padding: 16px; background: var(--surface-alt); text-align: center;
  border-right: 1px solid var(--border);
}
.news-item .news-date .day { font-size: 1.6rem; font-weight: 700; color: var(--text); line-height: 1.2; }
.news-item .news-date .month { font-size: 0.8rem; color: var(--text-weak); text-transform: uppercase; }
.news-item .news-body { flex: 1; padding: 20px 24px; display: flex; flex-direction: column; justify-content: center; }
.news-item .news-body .news-tag {
  display: inline-block; font-size: 0.7rem; padding: 2px 12px; border-radius: 20px;
  background: var(--accent-light); color: var(--accent); font-weight: 600;
  margin-bottom: 8px; width: fit-content;
}
.news-item .news-body h4 { margin-bottom: 6px; font-size: 1.05rem; }
.news-item .news-body h4 a { color: var(--text); }
.news-item .news-body h4 a:hover { color: var(--accent); }
.news-item .news-body p { font-size: 0.88rem; color: var(--text-secondary); margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-empty { text-align: center; padding: 48px 24px; color: var(--text-weak); background: var(--surface-alt); border-radius: var(--radius-lg); font-size: 1rem; }

/* ===== 数据统计 ===== */
.stats-section { background: var(--primary); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.stat-item h3 { font-size: 2.4rem; font-weight: 700; color: var(--text-on-dark); margin-bottom: 4px; }
.stat-item h3 .stat-suffix { font-size: 1.2rem; color: var(--accent); }
.stat-item p { font-size: 0.9rem; color: var(--text-on-dark-secondary); margin: 0; }

/* ===== 流程 ===== */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
.steps-grid::before {
  content: ''; position: absolute; top: 36px; left: 12%; right: 12%;
  height: 2px; background: linear-gradient(90deg, var(--accent), var(--border), var(--border), transparent);
  z-index: 0;
}
.step-card { text-align: center; position: relative; z-index: 1; }
.step-card .step-num {
  width: 72px; height: 72px; border-radius: 50%; background: var(--surface-card);
  border: 2px solid var(--accent); display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; font-weight: 700; color: var(--accent); margin: 0 auto 20px;
  box-shadow: 0 0 0 4px var(--surface), 0 0 0 6px var(--accent-light);
}
.step-card h4 { margin-bottom: 8px; }
.step-card p { font-size: 0.88rem; color: var(--text-secondary); margin: 0; }

/* ===== FAQ ===== */
.faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--surface-card); border: 1px solid var(--border);
  border-radius: var(--radius-md); overflow: hidden; transition: all var(--transition);
}
.faq-item:hover { border-color: var(--accent-light); }
.faq-item .faq-q {
  padding: 18px 24px; display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; font-weight: 500; color: var(--text); gap: 16px;
  transition: background var(--transition); user-select: none;
}
.faq-item .faq-q:hover { background: var(--surface-alt); }
.faq-item .faq-q i { color: var(--accent); transition: transform var(--transition); font-size: 0.85rem; }
.faq-item.open .faq-q i { transform: rotate(180deg); }
.faq-item .faq-a {
  max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px; color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 24px 20px; }

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  text-align: center; padding: 80px 0; position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; top: -50%; left: -20%; width: 500px; height: 500px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.cta-section .container { position: relative; z-index: 2; }
.cta-section h2 { color: var(--text-on-dark); margin-bottom: 16px; }
.cta-section p { color: var(--text-on-dark-secondary); font-size: 1.1rem; max-width: 560px; margin: 0 auto 32px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== 页脚 ===== */
.footer {
  background: var(--primary-dark); color: var(--text-on-dark-secondary);
  padding: 48px 0 24px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .footer-logo { font-size: 1.3rem; font-weight: 700; color: var(--text-on-dark); margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.footer-brand .footer-logo i { color: var(--accent); }
.footer-brand p { font-size: 0.88rem; max-width: 300px; }
.footer h4 { font-size: 0.95rem; color: var(--text-on-dark); margin-bottom: 16px; }
.footer ul li { margin-bottom: 8px; }
.footer ul li a { font-size: 0.88rem; color: var(--text-on-dark-secondary); transition: color var(--transition); }
.footer ul li a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  font-size: 0.82rem; color: var(--text-weak);
}
.footer-bottom a { color: var(--text-weak); }
.footer-bottom a:hover { color: var(--accent); }
.footer-socials { display: flex; gap: 12px; }
.footer-socials a {
  width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.06);
  display: flex; align-items: center; justify-content: center; color: var(--text-on-dark-secondary);
  transition: all var(--transition); font-size: 0.9rem;
}
.footer-socials a:hover { background: var(--accent); color: #fff; }

/* ===== 背景色板块 ===== */
.bg-alt { background: var(--surface-alt); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid::before { display: none; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-content { max-width: 100%; text-align: center; }
  .hero p { margin: 0 auto 32px; }
  .hero-actions { justify-content: center; }
  .hero-visual-card { max-width: 100%; }
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: 4px 0 40px rgba(0,0,0,0.3); }
  .mobile-header { display: flex; }
  .main-content { margin-left: 0; padding-top: var(--header-height); }
  .sidebar-overlay { display: block; }
  .sidebar-overlay.open { opacity: 1; pointer-events: auto; }
  .section-padding { padding: 56px 0; }
  .hero { padding: 72px 0 56px; }
  .features-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .steps-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .news-item { flex-direction: column; }
  .news-item .news-date { flex-direction: row; min-width: auto; gap: 8px; padding: 12px 20px; border-right: none; border-bottom: 1px solid var(--border); }
  .news-item .news-date .day { font-size: 1.2rem; }
  .hero-visual-card { grid-template-columns: 1fr 1fr; padding: 20px; }
  .btn-lg { padding: 14px 32px; font-size: 1rem; }
  .cta-section { padding: 56px 0; }
  .sidebar-nav .nav-item.active::before { left: 0; top: 0; width: 100%; height: 100%; border-radius: var(--radius-md); background: var(--accent); opacity: 0.15; }
}

@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .hero-visual-card { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-item h3 { font-size: 1.8rem; }
  .btn { padding: 12px 24px; font-size: 0.9rem; }
  .section-header { margin-bottom: 36px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f2440;
            --accent: #e67e22;
            --accent-light: #f0933b;
            --accent-dark: #c96a1a;
            --bg-body: #f5f7fa;
            --bg-white: #ffffff;
            --bg-sidebar: #0f2440;
            --bg-card: #ffffff;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-light: #7a8a9a;
            --text-white: #f0f4f8;
            --border: #e2e8f0;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-md: 0 6px 24px rgba(0,0,0,0.07);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.10);
            --transition: 0.25s ease;
            --sidebar-width: 240px;
            --header-height: 0px;
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        }

        /* ===== 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-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
        }
        a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: 1rem; }
        ul { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 600; color: var(--text-primary); }

        /* ===== Container ===== */
        .container {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Sidebar Navigation (App Shell) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            overflow-y: auto;
        }
        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 28px 20px 20px;
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .sidebar-logo i { color: var(--accent); font-size: 1.8rem; }
        .sidebar-logo span { background: linear-gradient(135deg, #fff 60%, var(--accent-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .sidebar-nav {
            padding: 16px 0;
            flex: 1;
        }
        .nav-label {
            padding: 8px 20px 4px;
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: rgba(255,255,255,0.35);
            font-weight: 600;
        }
        .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 20px;
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
            font-weight: 500;
            transition: all var(--transition);
            border-left: 3px solid transparent;
        }
        .nav-item i { width: 20px; text-align: center; font-size: 1rem; color: rgba(255,255,255,0.4); transition: color var(--transition); }
        .nav-item:hover { color: #fff; background: rgba(255,255,255,0.06); border-left-color: var(--accent); }
        .nav-item:hover i { color: var(--accent); }
        .nav-item.active { color: #fff; background: rgba(255,255,255,0.08); border-left-color: var(--accent); font-weight: 600; }
        .nav-item.active i { color: var(--accent); }
        .nav-divider { height: 1px; background: rgba(255,255,255,0.06); margin: 12px 20px; }

        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255,255,255,0.06);
            font-size: 0.75rem;
            color: rgba(255,255,255,0.3);
            text-align: center;
        }

        /* ===== Main Content Area ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Article Detail ===== */
        .article-detail {
            flex: 1;
            padding: 48px 0 64px;
        }
        .article-header {
            margin-bottom: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid var(--border);
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            margin-bottom: 16px;
            font-size: 0.9rem;
            color: var(--text-light);
        }
        .article-meta .badge {
            background: var(--accent);
            color: #fff;
            padding: 2px 14px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .article-meta i { margin-right: 6px; opacity: 0.6; }
        .article-title {
            font-size: 2.2rem;
            font-weight: 700;
            line-height: 1.25;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .article-description {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 720px;
        }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-primary);
            max-width: 800px;
        }
        .article-body p {
            margin-bottom: 1.2em;
        }
        .article-body h2, .article-body h3 {
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            color: var(--primary);
        }
        .article-body ul, .article-body ol {
            margin-bottom: 1.2em;
            padding-left: 1.6em;
        }
        .article-body li {
            margin-bottom: 0.4em;
        }
        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.5em 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body blockquote {
            border-left: 4px solid var(--accent);
            padding: 16px 24px;
            margin: 1.5em 0;
            background: rgba(230, 126, 34, 0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body code {
            background: #eef2f6;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
        }
        .article-body pre {
            background: #1a2a3a;
            color: #e8ecf0;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 1.5em 0;
            font-size: 0.9rem;
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 24px;
            max-width: 520px;
            margin: 0 auto;
        }
        .not-found-box i {
            font-size: 3.6rem;
            color: var(--text-light);
            opacity: 0.4;
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            font-size: 1.6rem;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-secondary);
            margin-bottom: 28px;
        }
        .not-found-box .btn {
            display: inline-block;
        }

        /* ===== Related Posts ===== */
        .related-section {
            margin-top: 56px;
            padding-top: 40px;
            border-top: 1px solid var(--border);
        }
        .related-section h3 {
            font-size: 1.4rem;
            color: var(--primary);
            margin-bottom: 24px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 20px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .related-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--accent);
        }
        .related-card .related-cat {
            font-size: 0.75rem;
            color: var(--accent);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }
        .related-card h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .related-card h4 a {
            color: var(--text-primary);
        }
        .related-card h4 a:hover {
            color: var(--accent);
        }
        .related-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0;
        }
        .related-card .related-date {
            font-size: 0.8rem;
            color: var(--text-light);
            margin-top: 8px;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: 50px;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            color: #fff;
            box-shadow: 0 6px 20px rgba(230, 126, 34, 0.35);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary-light);
            border: 2px solid var(--primary-light);
        }
        .btn-outline:hover {
            background: var(--primary-light);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 6px 18px;
            font-size: 0.85rem;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-sidebar);
            color: rgba(255,255,255,0.8);
            padding: 48px 0 28px;
            margin-top: auto;
        }
        .footer .container {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 36px;
            margin-bottom: 32px;
        }
        .footer-brand .footer-logo {
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-brand .footer-logo i { color: var(--accent); }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255,255,255,0.6);
            max-width: 280px;
        }
        .footer h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer ul li {
            margin-bottom: 8px;
        }
        .footer ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer ul li a:hover {
            color: var(--accent);
        }
        .footer ul li i {
            margin-right: 6px;
            color: rgba(255,255,255,0.3);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-socials {
            display: flex;
            gap: 12px;
        }
        .footer-socials a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            color: rgba(255,255,255,0.5);
            transition: all var(--transition);
            font-size: 1rem;
        }
        .footer-socials a:hover {
            background: var(--accent);
            color: #fff;
            transform: scale(1.08);
        }

        /* ===== Mobile Toggle ===== */
        .sidebar-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--primary);
            color: #fff;
            border: none;
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: var(--shadow-md);
            transition: background var(--transition);
        }
        .sidebar-toggle:hover { background: var(--primary-light); }
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.4);
            z-index: 999;
            backdrop-filter: blur(2px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            :root { --sidebar-width: 0px; }
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-toggle {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            .sidebar-overlay.active {
                display: block;
            }
            .main-content {
                margin-left: 0;
            }
            .article-detail {
                padding: 32px 0 48px;
            }
            .article-title {
                font-size: 1.6rem;
            }
            .article-description {
                font-size: 1rem;
            }
            .article-meta {
                font-size: 0.8rem;
                gap: 8px 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .article-title {
                font-size: 1.3rem;
            }
            .article-body {
                font-size: 0.98rem;
            }
            .article-detail {
                padding: 24px 0 36px;
            }
            .footer {
                padding: 32px 0 20px;
            }
            .related-card {
                padding: 16px 18px;
            }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-bottom: 20px;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb span {
            color: var(--text-secondary);
        }
        .breadcrumb i {
            font-size: 0.65rem;
            opacity: 0.5;
        }

/* roulang page: category1 */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-bg: #eff6ff;
            --secondary: #0f172a;
            --accent: #f59e0b;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --sidebar-w: 240px;
            --header-h: 0px;
            --max-w: 1200px;
            --gap: 32px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            display: flex;
            min-height: 100vh;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            color: var(--secondary);
            font-weight: 700;
        }

        .container {
            max-width: var(--max-w);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== 侧边栏 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--sidebar-w);
            background: var(--bg);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            padding: 0;
            overflow-y: auto;
        }

        .sidebar-brand {
            padding: 24px 20px 16px;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .sidebar-brand .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--primary);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            flex-shrink: 0;
        }

        .sidebar-brand .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--secondary);
            letter-spacing: -0.3px;
        }
        .sidebar-brand .logo-text span {
            color: var(--primary);
        }

        .sidebar-nav {
            padding: 12px 12px 20px;
            flex: 1;
        }

        .nav-label {
            font-size: 11px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.8px;
            color: var(--text-muted);
            padding: 16px 12px 6px;
        }

        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            color: var(--text);
            font-size: 14px;
            font-weight: 500;
            transition: all var(--transition);
            margin-bottom: 2px;
        }

        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: var(--text-light);
            transition: color var(--transition);
        }

        .sidebar-nav .nav-item:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }
        .sidebar-nav .nav-item:hover i {
            color: var(--primary);
        }

        .sidebar-nav .nav-item.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }
        .sidebar-nav .nav-item.active i {
            color: #fff;
        }

        .nav-divider {
            height: 1px;
            background: var(--border-light);
            margin: 8px 12px;
        }

        /* ===== 主内容区 ===== */
        .main-wrap {
            margin-left: var(--sidebar-w);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            background: var(--bg);
        }

        /* ===== 移动端顶部栏 ===== */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 999;
            background: var(--bg);
            border-bottom: 1px solid var(--border);
            padding: 12px 20px;
            align-items: center;
            justify-content: space-between;
        }

        .mobile-header .logo-text {
            font-size: 18px;
            font-weight: 800;
            color: var(--secondary);
        }
        .mobile-header .logo-text span {
            color: var(--primary);
        }

        .menu-toggle {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            font-size: 20px;
            color: var(--text);
            transition: background var(--transition);
        }
        .menu-toggle:hover {
            background: var(--bg-alt);
        }

        /* ===== 页面头部 ===== */
        .page-header {
            background: var(--secondary);
            padding: 64px 0 56px;
            position: relative;
            overflow: hidden;
        }

        .page-header::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(37, 99, 235, 0.25) 0%, transparent 70%);
            pointer-events: none;
        }

        .page-header .container {
            position: relative;
            z-index: 1;
        }

        .page-header h1 {
            font-size: 40px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .page-header p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 680px;
            line-height: 1.7;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 20px;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .breadcrumb a:hover {
            color: #fff;
        }
        .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.3);
        }

        /* ===== 方案概览 ===== */
        .section {
            padding: 72px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }

        .section-title {
            font-size: 30px;
            font-weight: 800;
            color: var(--secondary);
            margin-bottom: 8px;
            letter-spacing: -0.3px;
        }
        .section-sub {
            font-size: 16px;
            color: var(--text-light);
            max-width: 600px;
            margin-bottom: 40px;
            line-height: 1.7;
        }

        .solution-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .solution-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 32px 28px 28px;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }

        .solution-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--primary);
            opacity: 0;
            transition: opacity var(--transition);
        }

        .solution-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .solution-card:hover::after {
            opacity: 1;
        }

        .solution-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 18px;
            transition: all var(--transition);
        }

        .solution-card:hover .card-icon {
            background: var(--primary);
            color: #fff;
        }

        .solution-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--secondary);
        }

        .solution-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .solution-card .tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }

        .solution-card .tags span {
            font-size: 12px;
            padding: 3px 10px;
            border-radius: 20px;
            background: var(--bg-alt);
            color: var(--text-light);
            border: 1px solid var(--border-light);
        }

        .tag-primary {
            background: var(--primary-bg) !important;
            color: var(--primary) !important;
            border-color: var(--primary-light) !important;
        }

        /* ===== 技术架构 ===== */
        .arch-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .arch-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 28px 20px 24px;
            text-align: center;
            transition: all var(--transition);
        }

        .arch-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .arch-item .arch-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin: 0 auto 14px;
            transition: all var(--transition);
        }

        .arch-item:hover .arch-icon {
            background: var(--primary);
            color: #fff;
        }

        .arch-item h4 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 4px;
            color: var(--secondary);
        }

        .arch-item p {
            font-size: 13px;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* ===== 案例区块 ===== */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .case-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }

        .case-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--primary-light);
        }

        .case-card .case-img {
            height: 200px;
            background: var(--bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 40px;
            border-bottom: 1px solid var(--border-light);
            position: relative;
            overflow: hidden;
        }

        .case-card .case-img .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(15, 23, 42, 0.04));
        }

        .case-card .case-body {
            padding: 24px 24px 26px;
        }

        .case-card .case-body .badge {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 20px;
            background: var(--primary-bg);
            color: var(--primary);
            margin-bottom: 10px;
        }

        .case-card .case-body h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--secondary);
        }

        .case-card .case-body p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .stat-item {
            text-align: center;
            padding: 32px 16px;
            border-radius: var(--radius);
            background: var(--bg-card);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }

        .stat-item:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-md);
        }

        .stat-item .stat-num {
            font-size: 38px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            letter-spacing: -1px;
        }

        .stat-item .stat-num .unit {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-light);
        }

        .stat-item .stat-label {
            font-size: 14px;
            color: var(--text-light);
            margin-top: 6px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color var(--transition);
            background: var(--bg-card);
        }

        .faq-item:hover {
            border-color: var(--primary-light);
        }

        .faq-item summary {
            padding: 16px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--secondary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            list-style: none;
            transition: color var(--transition);
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary .faq-icon {
            font-size: 14px;
            color: var(--primary);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-item[open] summary .faq-icon {
            transform: rotate(45deg);
        }

        .faq-item .faq-body {
            padding: 0 20px 18px;
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.8;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--secondary);
            padding: 64px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 70% 50%, rgba(37, 99, 235, 0.2) 0%, transparent 70%);
            pointer-events: none;
        }

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

        .cta-section h2 {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }

        .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            transition: all var(--transition);
            border: 2px solid transparent;
            line-height: 1.4;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
        }

        .btn-outline-light {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, 0.3);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.6);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
            border-radius: 6px;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer .footer-logo {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }

        .footer .footer-logo i {
            color: var(--primary);
        }

        .footer .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.7;
            max-width: 320px;
        }

        .footer h4 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

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

        .footer ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            transition: color var(--transition);
        }
        .footer ul li a:hover {
            color: #fff;
        }

        .footer ul li i {
            margin-right: 6px;
            color: rgba(255, 255, 255, 0.3);
        }

        .footer .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.35);
        }

        .footer .footer-socials {
            display: flex;
            gap: 12px;
        }

        .footer .footer-socials a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: rgba(255, 255, 255, 0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            transition: all var(--transition);
        }

        .footer .footer-socials a:hover {
            background: var(--primary);
            color: #fff;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .solution-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .arch-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }

            .sidebar.open {
                transform: translateX(0);
            }

            .sidebar-overlay {
                display: none;
                position: fixed;
                inset: 0;
                background: rgba(0, 0, 0, 0.4);
                z-index: 999;
                backdrop-filter: blur(4px);
            }

            .sidebar-overlay.active {
                display: block;
            }

            .main-wrap {
                margin-left: 0;
            }

            .mobile-header {
                display: flex;
            }

            .page-header {
                padding: 48px 0 40px;
            }
            .page-header h1 {
                font-size: 28px;
            }
            .page-header p {
                font-size: 15px;
            }

            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 24px;
            }

            .solution-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .arch-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }

            .case-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }

            .stat-item .stat-num {
                font-size: 30px;
            }

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

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

            .cta-section h2 {
                font-size: 24px;
            }
            .cta-section p {
                font-size: 15px;
            }
            .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .page-header h1 {
                font-size: 22px;
            }

            .section-title {
                font-size: 20px;
            }

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

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }

            .stat-item {
                padding: 20px 12px;
            }
            .stat-item .stat-num {
                font-size: 26px;
            }

            .solution-card {
                padding: 24px 20px 22px;
            }

            .case-card .case-body {
                padding: 18px 18px 20px;
            }

            .faq-item summary {
                padding: 14px 16px;
                font-size: 14px;
            }
            .faq-item .faq-body {
                padding: 0 16px 14px;
                font-size: 13px;
            }
        }