:root {
      --primary: #1D7BFF;
      --primary-hover: #0056b3;
      --theme-silver: rgb(223,230,233);
      --dark-ink: #0B132B;
      --dark-blue: #1C2541;
      --light-bg: #F8FAFC;
      --text-main: #1E293B;
      --text-light: #64748B;
      --border-color: rgba(0,0,0,0.08);
      --card-bg: #ffffff;
      --transition: all 0.3s ease;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: var(--text-main); background-color: var(--light-bg); line-height: 1.6; }
    a { color: inherit; text-decoration: none; transition: var(--transition); }

    
    .site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-color); }
    .header-container { max-width: 1200px; margin: 0 auto; padding: 15px 20px; display: flex; justify-content: space-between; align-items: center; }
    .logo { display: inline-flex; align-items: center; gap: 12px; }
    .logo img { height: 40px; width: auto; object-fit: contain; }
    .logo span { font-size: 20px; font-weight: 800; color: var(--dark-ink); }
    .desktop-nav { display: flex; gap: 24px; }
    .desktop-nav a { font-size: 15px; font-weight: 500; color: var(--text-main); padding: 8px 0; border-bottom: 2px solid transparent; }
    .desktop-nav a:hover { color: var(--primary); border-bottom-color: var(--primary); }
    .header-actions { display: flex; align-items: center; gap: 16px; }
    .nav-btn { background: var(--primary); color: #fff; padding: 10px 20px; border-radius: 6px; font-weight: 600; font-size: 14px; }
    .nav-btn:hover { background: var(--primary-hover); }
    .drawer-trigger { display: none; background: none; border: none; flex-direction: column; gap: 6px; cursor: pointer; }
    .drawer-trigger span { display: block; width: 25px; height: 2px; background: var(--dark-ink); }

    
    .mobile-drawer-overlay { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(0,0,0,0.5); z-index: 1999; opacity: 0; pointer-events: none; transition: var(--transition); }
    .mobile-drawer-overlay.active { opacity: 1; pointer-events: auto; }
    .mobile-drawer { position: fixed; top: 0; left: -300px; width: 300px; height: 100vh; background: #fff; z-index: 2000; box-shadow: 4px 0 20px rgba(0,0,0,0.15); transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1); display: flex; flex-direction: column; }
    .mobile-drawer.active { left: 0; }
    .drawer-header { padding: 20px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
    .drawer-close { background: none; border: none; font-size: 28px; color: var(--text-light); cursor: pointer; }
    .drawer-nav { padding: 20px; display: flex; flex-direction: column; gap: 16px; overflow-y: auto; }
    .drawer-nav a { font-size: 16px; font-weight: 600; color: var(--text-main); padding: 10px 0; border-bottom: 1px solid rgba(0,0,0,0.03); }
    .drawer-nav a:hover { color: var(--primary); }
    .drawer-btn { margin-top: 10px; background: var(--primary); color: #fff; text-align: center; padding: 12px; border-radius: 6px; font-weight: 600; }

    
    .breadcrumb-wrapper { background: var(--theme-silver); padding: 15px 20px; border-bottom: 1px solid var(--border-color); }
    .breadcrumb-container { max-width: 1200px; margin: 0 auto; font-size: 14px; color: var(--text-light); }
    .breadcrumb-container a { color: var(--primary); }

    
    .article-layout {
      max-width: 900px;
      margin: 40px auto 100px;
      padding: 0 20px;
    }

    .article-head {
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 30px;
      margin-bottom: 30px;
    }

    .article-head h1 {
      font-size: 36px;
      line-height: 1.35;
      color: var(--dark-ink);
      font-weight: 800;
      margin-bottom: 20px;
    }

    .article-meta-info {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      font-size: 14px;
      color: var(--text-light);
    }

    .article-meta-info span {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    
    .article-body-text {
      font-size: 17px;
      color: var(--text-main);
      line-height: 1.85;
      margin-bottom: 50px;
    }

    .article-body-text p {
      margin-bottom: 24px;
    }

    .article-body-text h2 {
      font-size: 24px;
      color: var(--dark-ink);
      margin-top: 40px;
      margin-bottom: 20px;
      font-weight: 700;
    }

    .article-body-text blockquote {
      border-left: 4px solid var(--primary);
      padding: 15px 20px;
      background: rgba(29, 123, 255, 0.05);
      font-style: italic;
      margin: 30px 0;
      border-radius: 0 8px 8px 0;
    }

    .article-body-text img {
      max-width: 100%;
      height: auto;
      border-radius: 8px;
      margin: 30px 0;
    }

    
    .prev-next-nav {
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 24px 0;
      margin-bottom: 60px;
      display: flex;
      justify-content: space-between;
      gap: 20px;
    }

    .nav-link-box {
      flex: 1;
    }

    .nav-link-box span {
      display: block;
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 4px;
    }

    .nav-link-box a {
      font-size: 15px;
      font-weight: 700;
      color: var(--dark-ink);
    }

    .nav-link-box a:hover {
      color: var(--primary);
    }

    
    .related-section h3 {
      font-size: 22px;
      font-weight: 800;
      color: var(--dark-ink);
      margin-bottom: 25px;
    }

    .related-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .rel-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .rel-thumb {
      height: 140px;
      background: var(--theme-silver);
    }

    .rel-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .rel-body {
      padding: 16px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .rel-title {
      font-size: 14px;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 12px;
    }

    .rel-date {
      font-size: 11px;
      color: var(--text-light);
    }

    
    .site-footer { background: var(--dark-ink); color: #94A3B8; border-top: 1px solid rgba(255,255,255,0.05); }
    .footer-container { max-width: 1200px; margin: 0 auto; padding: 80px 20px 40px; display: flex; justify-content: space-between; gap: 60px; }
    .footer-brand { flex: 1; max-width: 400px; }
    .footer-brand .logo span { color: #fff; }
    .brand-desc { margin-top: 20px; font-size: 14px; line-height: 1.6; }
    .footer-links-grid { display: grid; grid-template-columns: repeat(3, 160px); gap: 40px; }
    .footer-col h4 { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 20px; }
    .footer-col ul { list-style: none; }
    .footer-col ul li { margin-bottom: 12px; }
    .footer-col ul li a { font-size: 14px; transition: var(--transition); }
    .footer-col ul li a:hover { color: var(--primary); }
    .footer-bottom { border-top: 1px solid rgba(255,255,255,0.05); padding: 30px 20px; max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; font-size: 13px; }

    @media (max-width: 768px) {
      .desktop-nav, .nav-btn { display: none; }
      .drawer-trigger { display: flex; }
      .related-grid { grid-template-columns: 1fr; }
      .footer-container { flex-direction: column; gap: 40px; }
      .footer-links-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
      .footer-bottom { flex-direction: column; text-align: center; gap: 15px; }
    }