/* roulang page: index */
:root {
      --primary: #6320EE;
      --primary-hover: #4F13C4;
      --secondary: #21E6C1;
      --secondary-dark: #0EB898;
      --bg-base: #F7F8FC;
      --bg-white: #FFFFFF;
      --bg-soft: #EEF1F8;
      --text-main: #1D2129;
      --text-muted: #4E5969;
      --border-color: #E2E4EA;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-pill: 999px;
      --shadow-sm: 0 4px 16px rgba(99, 32, 238, 0.05);
      --shadow-md: 0 8px 28px rgba(99, 32, 238, 0.08);
      --transition: all 0.28s ease;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    .site-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
    .btn-pill {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
      border: 1.5px solid transparent;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
      box-shadow: 0 6px 16px rgba(99, 32, 238, 0.25);
    }
    .btn-primary:hover { background-color: var(--primary-hover); color: #fff; }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover { background: rgba(99, 32, 238, 0.06); }
    .btn-secondary {
      background-color: var(--secondary);
      color: #0d2822;
      font-weight: 700;
    }
    .btn-secondary:hover { background-color: var(--secondary-dark); color: #fff; }

    /* Header Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      height: 64px;
    }
    .nav-inner {
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      font-size: 22px;
      color: var(--primary);
    }
    .nav-brand .brand-badge {
      font-size: 11px;
      background: rgba(99, 32, 238, 0.1);
      color: var(--primary);
      padding: 2px 8px;
      border-radius: var(--radius-pill);
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--primary);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    /* Section Utility */
    .sec-block { padding: 80px 0; }
    .sec-white { background: var(--bg-white); }
    .sec-soft { background: var(--bg-soft); }
    .sec-base { background: var(--bg-base); }
    .sec-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }
    .sec-badge {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: rgba(99, 32, 238, 0.08);
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      margin-bottom: 12px;
    }
    .sec-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 16px;
    }
    .sec-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
      margin: 0;
    }

    /* Hero Section */
    .hero-strip {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      padding: 56px 0;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-content {
      flex: 1.1;
    }
    .hero-preview {
      flex: 0.9;
      position: relative;
    }
    .hero-h1 {
      font-size: 38px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .hero-h1 span { color: var(--primary); }
    .hero-lead {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.85;
      margin-bottom: 28px;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 30px;
    }
    .hero-status-tags {
      display: flex;
      gap: 16px;
      font-size: 13px;
      color: var(--text-muted);
    }
    .hero-status-tags span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .hero-status-tags .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--secondary);
    }
    .hero-card-frame {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      background: #fff;
    }
    .hero-card-frame img {
      width: 100%;
      height: 280px;
      object-fit: cover;
    }
    .hero-frame-foot {
      padding: 16px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #fff;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Cards & Grids */
    .card-base {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
    }
    .card-base:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(99, 32, 238, 0.3);
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(99, 32, 238, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 20px;
    }
    .card-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.75;
      margin: 0;
    }

    /* Metric Bar */
    .metric-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .metric-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
    }
    .metric-card .num {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 6px;
    }
    .metric-card .label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Stream Stage Demo */
    .stage-wrapper {
      background: #111422;
      border-radius: var(--radius-md);
      padding: 30px;
      color: #fff;
    }
    .stage-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      padding-bottom: 16px;
      margin-bottom: 24px;
    }
    .stage-tabs {
      display: flex;
      gap: 12px;
    }
    .stage-tab {
      background: rgba(255, 255, 255, 0.08);
      padding: 6px 14px;
      border-radius: var(--radius-pill);
      font-size: 13px;
      color: #cfd3dc;
    }
    .stage-tab.active {
      background: var(--secondary);
      color: #07221d;
      font-weight: 700;
    }
    .stage-player-box {
      border-radius: var(--radius-sm);
      overflow: hidden;
      position: relative;
    }
    .stage-player-box img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .stage-overlay {
      position: absolute;
      bottom: 20px;
      left: 20px;
      right: 20px;
      background: rgba(17, 20, 34, 0.85);
      backdrop-filter: blur(8px);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* Comparison / Plans */
    .plan-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .plan-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .plan-card.featured {
      border-color: var(--primary);
      box-shadow: 0 8px 30px rgba(99, 32, 238, 0.12);
    }
    .plan-featured-tag {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--primary);
      color: #fff;
      font-size: 11px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
    }
    .plan-price {
      font-size: 34px;
      font-weight: 800;
      color: var(--text-main);
      margin: 16px 0 24px 0;
    }
    .plan-price span { font-size: 14px; font-weight: normal; color: var(--text-muted); }
    .plan-list {
      list-style: none;
      margin: 0 0 30px 0;
      flex: 1;
    }
    .plan-list li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .plan-list li::before {
      content: "✓";
      color: var(--secondary-dark);
      font-weight: bold;
    }

    /* Testimonials */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
    }
    .review-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }
    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .review-info h4 { font-size: 15px; margin: 0; font-weight: 700; }
    .review-info p { font-size: 12px; color: var(--text-muted); margin: 0; }
    .review-body { font-size: 14px; color: var(--text-muted); line-height: 1.75; }

    /* CMS Article Feed */
    .cms-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .cms-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .cms-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(99, 32, 238, 0.3);
    }
    .cms-card-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }
    .cms-card-tag {
      font-size: 12px;
      color: var(--primary);
      font-weight: 700;
      margin-bottom: 10px;
    }
    .cms-card-title {
      font-size: 17px;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .cms-card-title a:hover { color: var(--primary); }
    .cms-card-excerpt {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 16px;
      flex: 1;
    }
    .cms-card-meta {
      font-size: 12px;
      color: #9aa1b0;
      border-top: 1px solid var(--border-color);
      padding-top: 12px;
    }
    .cms-more-bar {
      margin-top: 36px;
      text-align: center;
    }

    /* Accordion FAQ */
    .faq-wrapper {
      max-width: 820px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      padding: 20px 24px;
    }
    .faq-q {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .faq-a {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.8;
      margin: 0;
    }

    /* Final CTA */
    .cta-banner {
      background: linear-gradient(135deg, #4b15bb 0%, #6320EE 100%);
      border-radius: var(--radius-md);
      padding: 60px 40px;
      text-align: center;
      color: #fff;
    }
    .cta-banner h2 {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 16px;
      color: #fff;
    }
    .cta-banner p {
      font-size: 16px;
      max-width: 680px;
      margin: 0 auto 30px auto;
      color: rgba(255, 255, 255, 0.88);
      line-height: 1.8;
    }
    .cta-group {
      display: flex;
      justify-content: center;
      gap: 16px;
    }

    /* Footer */
    .site-footer {
      background: #111422;
      color: #8C93A4;
      padding: 60px 0 30px 0;
      font-size: 14px;
      border-top: 1px solid #1E2336;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h3 {
      color: #fff;
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .footer-brand p {
      line-height: 1.8;
      max-width: 420px;
      margin: 0;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      margin: 0;
    }
    .footer-links li { margin-bottom: 10px; }
    .footer-links a:hover { color: #fff; }
    .footer-bottom {
      border-top: 1px solid #1E2336;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .metric-row { grid-template-columns: repeat(2, 1fr); }
      .plan-grid { grid-template-columns: 1fr; }
      .review-grid { grid-template-columns: 1fr; }
      .cms-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .sec-block { padding: 48px 0; }
      .hero-grid { flex-direction: column; }
      .hero-h1 { font-size: 28px; }
      .sec-title { font-size: 24px; }
      .cta-group { flex-direction: column; align-items: stretch; }
    }

/* roulang page: article */
:root {
      --primary: #6320EE;
      --primary-hover: #4F13C4;
      --secondary: #21E6C1;
      --secondary-dark: #0EB898;
      --bg-base: #F7F8FC;
      --bg-white: #FFFFFF;
      --bg-soft: #EEF1F8;
      --text-main: #1D2129;
      --text-muted: #4E5969;
      --border-color: #E2E4EA;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-pill: 999px;
      --shadow-sm: 0 4px 16px rgba(99, 32, 238, 0.05);
      --shadow-md: 0 8px 28px rgba(99, 32, 238, 0.08);
      --transition: all 0.28s ease;
    }
    * { box-sizing: border-box; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    .site-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
    .btn-pill {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      transition: var(--transition);
      border: 1.5px solid transparent;
      line-height: 1;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
      box-shadow: 0 6px 16px rgba(99, 32, 238, 0.25);
    }
    .btn-primary:hover { background-color: var(--primary-hover); color: #fff; }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover { background: rgba(99, 32, 238, 0.06); }
    
    /* Header Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      height: 64px;
    }
    .nav-inner {
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      font-size: 22px;
      color: var(--primary);
    }
    .nav-brand .brand-badge {
      font-size: 11px;
      background: rgba(99, 32, 238, 0.1);
      color: var(--primary);
      padding: 2px 8px;
      border-radius: var(--radius-pill);
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--primary);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    /* Article Specific Components */
    .article-wrap {
      max-width: 820px;
      margin: 0 auto;
    }
    .sec-block { padding: 48px 0; }
    .sec-block-alt { background-color: var(--bg-white); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
    
    /* Section 1: Breadcrumb & Title Area */
    .article-header-sec {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
      padding: 36px 0 32px 0;
    }
    .crumb-bar {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 20px;
    }
    .crumb-bar a:hover { color: var(--primary); }
    .crumb-sep { color: #A0AEC0; }
    .article-h1 {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.35;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .meta-bar {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 18px;
      font-size: 13px;
      color: var(--text-muted);
      padding-bottom: 8px;
    }
    .meta-tag {
      background: rgba(99, 32, 238, 0.08);
      color: var(--primary);
      padding: 3px 10px;
      border-radius: var(--radius-pill);
      font-weight: 600;
    }
    .meta-item { display: inline-flex; align-items: center; gap: 5px; }

    /* Section 2: Executive Summary */
    .summary-box {
      background: #FAF9FF;
      border: 1.5px solid rgba(99, 32, 238, 0.2);
      border-left: 5px solid var(--primary);
      border-radius: var(--radius-sm);
      padding: 24px;
      margin-bottom: 36px;
    }
    .summary-title {
      font-size: 15px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .summary-list {
      margin: 0;
      padding-left: 20px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.8;
    }

    /* Section 3: Rich Text Body */
    .article-body {
      font-size: 16px;
      line-height: 1.85;
      color: #2D3748;
    }
    .article-body h2 {
      font-size: 24px;
      font-weight: 700;
      color: var(--text-main);
      margin: 36px 0 16px 0;
      padding-bottom: 10px;
      border-bottom: 1px solid var(--border-color);
    }
    .article-body h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-main);
      margin: 28px 0 14px 0;
    }
    .article-body p { margin-bottom: 20px; }
    .article-body ul, .article-body ol {
      margin: 0 0 24px 24px;
      padding: 0;
    }
    .article-body li { margin-bottom: 8px; }
    .article-body blockquote {
      margin: 24px 0;
      padding: 16px 20px;
      background: var(--bg-soft);
      border-left: 4px solid var(--secondary-dark);
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      color: var(--text-muted);
      font-style: normal;
    }
    .article-body img {
      border-radius: var(--radius-md);
      margin: 24px auto;
      box-shadow: var(--shadow-sm);
    }
    .figure-caption {
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
      margin-top: -12px;
      margin-bottom: 24px;
    }

    /* Section 4: Action Utility Bar */
    .post-toolbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 20px 24px;
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin: 40px 0;
    }
    .toolbar-left {
      display: flex;
      gap: 12px;
    }
    .action-btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 16px;
      border-radius: var(--radius-pill);
      font-size: 13px;
      font-weight: 600;
      background: var(--bg-soft);
      color: var(--text-main);
      border: 1px solid transparent;
      cursor: pointer;
    }
    .action-btn:hover {
      background: rgba(99, 32, 238, 0.08);
      color: var(--primary);
    }
    .node-status-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      color: var(--secondary-dark);
      background: rgba(33, 230, 193, 0.12);
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      font-weight: 600;
    }
    .status-dot {
      width: 7px;
      height: 7px;
      background: var(--secondary-dark);
      border-radius: 50%;
    }

    /* Section 5: Author Profile & Protocol */
    .author-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      gap: 20px;
      margin-bottom: 40px;
    }
    .author-avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 800;
      font-size: 20px;
      flex-shrink: 0;
    }
    .author-info h4 {
      margin: 0 0 6px 0;
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-info p {
      margin: 0 0 10px 0;
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .author-license {
      font-size: 12px;
      color: #8C9BA5;
      border-top: 1px dashed var(--border-color);
      padding-top: 8px;
    }

    /* Section 6: Related Dispatches */
    .related-sec { padding: 48px 0; }
    .related-title {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 24px;
      color: var(--text-main);
    }
    .related-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }
    .related-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 16px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .related-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-sm);
      border-color: rgba(99, 32, 238, 0.3);
    }
    .related-card-tag {
      font-size: 11px;
      color: var(--primary);
      margin-bottom: 8px;
      font-weight: 600;
    }
    .related-card-h {
      font-size: 14px;
      font-weight: 700;
      line-height: 1.5;
      color: var(--text-main);
      margin: 0 0 12px 0;
    }
    .related-card-foot {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Section 7: Interaction & Comment Box */
    .feedback-panel {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      margin-top: 40px;
    }
    .panel-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .panel-subtitle {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 20px;
    }
    .feedback-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .input-textarea {
      width: 100%;
      min-height: 100px;
      padding: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: var(--bg-base);
      color: var(--text-main);
      outline: none;
      resize: vertical;
    }
    .input-textarea:focus {
      border-color: var(--primary);
      background: #fff;
    }
    .feedback-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .note-text {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Footer */
    .site-footer {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      padding: 56px 0 24px 0;
      margin-top: 60px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h3 {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 14px;
    }
    .footer-brand p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.75;
      max-width: 480px;
    }
    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links li { margin-bottom: 10px; }
    .footer-links a {
      font-size: 14px;
      color: var(--text-muted);
    }
    .footer-links a:hover { color: var(--primary); }
    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Responsive */
    @media (max-width: 900px) {
      .related-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    }
    @media (max-width: 640px) {
      .article-h1 { font-size: 24px; }
      .related-grid { grid-template-columns: 1fr; }
      .post-toolbar { flex-direction: column; gap: 14px; align-items: flex-start; }
      .feedback-row { flex-direction: column; align-items: flex-start; gap: 12px; }
      .nav-menu { display: none; }
    }

/* roulang page: category1 */
:root {
      --primary: #6320EE;
      --primary-hover: #4F13C4;
      --secondary: #21E6C1;
      --secondary-dark: #0EB898;
      --bg-base: #F7F8FC;
      --bg-white: #FFFFFF;
      --bg-soft: #EEF1F8;
      --text-main: #1D2129;
      --text-muted: #4E5969;
      --border-color: #E2E4EA;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-pill: 999px;
      --shadow-sm: 0 4px 16px rgba(99, 32, 238, 0.05);
      --shadow-md: 0 8px 28px rgba(99, 32, 238, 0.08);
      --transition: all 0.28s ease;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      margin: 0;
      padding: 0;
    }
    a { color: inherit; text-decoration: none; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    .site-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
    .btn-pill {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
      border: 1.5px solid transparent;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
      box-shadow: 0 6px 16px rgba(99, 32, 238, 0.25);
    }
    .btn-primary:hover { background-color: var(--primary-hover); color: #fff; }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover { background: rgba(99, 32, 238, 0.06); }
    .btn-secondary {
      background-color: var(--secondary);
      color: #0d2822;
      font-weight: 700;
    }
    .btn-secondary:hover { background-color: var(--secondary-dark); color: #fff; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      height: 64px;
    }
    .nav-inner {
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      font-size: 22px;
      color: var(--primary);
    }
    .nav-brand .brand-badge {
      font-size: 11px;
      background: rgba(99, 32, 238, 0.1);
      color: var(--primary);
      padding: 2px 8px;
      border-radius: var(--radius-pill);
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--primary);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .sec-block { padding: 72px 0; }
    .sec-block-alt { background: var(--bg-soft); }
    .sec-block-white { background: var(--bg-white); }
    .sec-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 46px auto;
    }
    .sec-badge {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: rgba(99, 32, 238, 0.08);
      padding: 4px 14px;
      border-radius: var(--radius-pill);
      margin-bottom: 14px;
    }
    .sec-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 14px;
    }
    .sec-subtitle {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
      margin: 0;
    }
    .cat-head-panel {
      background: linear-gradient(135deg, #ffffff 0%, #f1edf9 100%);
      border-bottom: 1px solid var(--border-color);
      padding: 60px 0 45px 0;
    }
    .cat-head-meta {
      display: flex;
      gap: 16px;
      margin-bottom: 16px;
      flex-wrap: wrap;
    }
    .cat-tag {
      background: rgba(99, 32, 238, 0.1);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      font-size: 12px;
      font-weight: 600;
    }
    .cat-h1 {
      font-size: 36px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 18px;
    }
    .cat-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 880px;
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .cat-stat-strip {
      display: flex;
      gap: 32px;
      padding-top: 18px;
      border-top: 1px dashed var(--border-color);
    }
    .cat-stat-item strong {
      font-size: 24px;
      color: var(--primary);
      display: block;
      line-height: 1.2;
    }
    .cat-stat-item span {
      font-size: 13px;
      color: var(--text-muted);
    }
    .filter-panel {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      margin-bottom: 36px;
    }
    .filter-group {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 10px 0;
      border-bottom: 1px solid #F0F2F5;
    }
    .filter-group:last-child { border-bottom: none; }
    .filter-label {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-muted);
      width: 90px;
      flex-shrink: 0;
    }
    .filter-items {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }
    .filter-btn {
      font-size: 13px;
      padding: 4px 14px;
      border-radius: var(--radius-pill);
      border: 1px solid #E5E6EB;
      color: var(--text-main);
      background: #FAFAFA;
      cursor: pointer;
    }
    .filter-btn.active, .filter-btn:hover {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }
    .card-base {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .card-base:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(99, 32, 238, 0.3);
    }
    .card-img-wrap {
      width: 100%;
      height: 190px;
      overflow: hidden;
      position: relative;
      background: #E5E6EB;
    }
    .card-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .card-base:hover .card-img-wrap img {
      transform: scale(1.05);
    }
    .card-overlay-badge {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(29, 33, 41, 0.75);
      color: #fff;
      font-size: 11px;
      padding: 3px 8px;
      border-radius: 4px;
      backdrop-filter: blur(4px);
    }
    .card-body {
      padding: 22px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.45;
    }
    .card-title:hover { color: var(--primary); }
    .card-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 16px;
      flex: 1;
    }
    .card-foot {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      color: #86909C;
      border-top: 1px solid #F2F3F5;
      padding-top: 12px;
    }
    .card-foot span { display: flex; align-items: center; gap: 4px; }
    .focus-grid {
      display: grid;
      grid-template-columns: 1.3fr 1fr;
      gap: 28px;
    }
    .focus-main-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .focus-main-img {
      width: 100%;
      height: 280px;
      object-fit: cover;
    }
    .focus-main-content {
      padding: 30px;
    }
    .focus-sub-col {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .focus-sub-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 18px;
      align-items: center;
    }
    .focus-sub-thumb {
      width: 110px;
      height: 85px;
      border-radius: var(--radius-sm);
      object-fit: cover;
      flex-shrink: 0;
    }
    .spec-table-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .spec-table-card table {
      width: 100%;
      margin: 0;
      border-collapse: collapse;
    }
    .spec-table-card th {
      background: #F4F5F9;
      padding: 16px 20px;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      border-bottom: 1px solid var(--border-color);
    }
    .spec-table-card td {
      padding: 16px 20px;
      font-size: 14px;
      color: var(--text-muted);
      border-bottom: 1px solid var(--border-color);
    }
    .expert-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 22px;
    }
    .expert-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 26px 20px;
      text-align: center;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .expert-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .expert-avatar {
      width: 72px;
      height: 72px;
      border-radius: 50%;
      background: rgba(99, 32, 238, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
      font-size: 24px;
      font-weight: 800;
      border: 2px solid var(--secondary);
    }
    .expert-name {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .expert-role {
      font-size: 12px;
      color: var(--primary);
      background: rgba(99, 32, 238, 0.08);
      padding: 2px 10px;
      border-radius: var(--radius-pill);
      display: inline-block;
      margin-bottom: 12px;
    }
    .expert-bio {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin: 0;
    }
    .subscribe-panel {
      background: linear-gradient(135deg, var(--primary) 0%, #3d0c9f 100%);
      border-radius: var(--radius-md);
      padding: 56px 40px;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      box-shadow: var(--shadow-md);
    }
    .sub-info h3 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 12px;
      color: #fff;
    }
    .sub-info p {
      font-size: 15px;
      color: rgba(255, 255, 255, 0.85);
      margin: 0;
      max-width: 580px;
      line-height: 1.7;
    }
    .sub-form-wrap {
      display: flex;
      gap: 12px;
      width: 100%;
      max-width: 420px;
    }
    .sub-input {
      flex: 1;
      height: 48px;
      border-radius: var(--radius-pill);
      border: 1px solid rgba(255, 255, 255, 0.3);
      background: rgba(255, 255, 255, 0.15);
      color: #fff;
      padding: 0 20px;
      font-size: 14px;
      outline: none;
    }
    .sub-input::placeholder { color: rgba(255, 255, 255, 0.6); }
    .site-footer {
      background: #111319;
      color: #A4A9B6;
      padding: 64px 0 24px 0;
      border-top: 1px solid #232733;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand h3 {
      color: #fff;
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 14px;
    }
    .footer-brand p {
      font-size: 14px;
      line-height: 1.8;
      max-width: 440px;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 10px;
      font-size: 14px;
    }
    .footer-links a:hover { color: var(--secondary); }
    .footer-bottom {
      border-top: 1px solid #232733;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #6C7280;
    }
    @media (max-width: 1024px) {
      .focus-grid { grid-template-columns: 1fr; }
      .expert-grid { grid-template-columns: repeat(2, 1fr); }
      .subscribe-panel { flex-direction: column; text-align: center; }
      .sub-info p { margin: 0 auto; }
      .sub-form-wrap { margin: 0 auto; }
    }
    @media (max-width: 768px) {
      .site-header { height: auto; padding: 12px 0; }
      .nav-inner { flex-direction: column; height: auto; gap: 12px; }
      .hero-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; gap: 28px; }
      .expert-grid { grid-template-columns: 1fr; }
      .cat-h1 { font-size: 26px; }
      .cat-stat-strip { flex-direction: column; gap: 14px; }
      .filter-group { flex-direction: column; align-items: flex-start; }
      .filter-label { margin-bottom: 6px; }
      .sub-form-wrap { flex-direction: column; }
      .sub-input, .btn-secondary { width: 100%; }
    }