:root {
      --primary: #002FA7;
      --primary-deep: #001B68;
      --paper: rgba(255,255,255,0.84);
      --surface: rgba(255,255,255,0.92);
      --text-main: #0D1530;
      --text-muted: #536079;
      --border: rgba(0,47,167,0.14);
      --accent: #E8FF00;
      --shadow: 0 20px 50px rgba(0,47,167,0.10);
      --radius: 18px;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      min-height: 100vh;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      line-height: 1.8;
      background: radial-gradient(circle at 82% 10%, rgba(0,47,167,0.16), transparent 24%), linear-gradient(180deg, #FFFFFF 0%, #E9EEFF 100%);
    }
    body::before {
      content: "";
      position: fixed;
      inset: 0;
      z-index: -1;
      pointer-events: none;
      background: linear-gradient(rgba(0,47,167,0.045) 1px, transparent 1px), linear-gradient(90deg, rgba(0,47,167,0.045) 1px, transparent 1px);
      background-size: 44px 44px, 44px 44px;
    }
    a { color: inherit; }

    nav {
      position: fixed;
      top: 18px;
      left: 24px;
      right: 24px;
      height: 66px;
      background: rgba(255,255,255,0.78);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border);
      border-radius: 12px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0 28px;
      z-index: 1000;
      box-shadow: 0 18px 44px rgba(0,47,167,0.10);
    }

    .logo {
      display: inline-flex;
      align-items: center;
      flex: 0 0 auto;
      gap: 0;
      font-size: 0;
      color: var(--primary);
      text-decoration: none;
      line-height: 0;
    }
    .logo img { width: 138px; height: auto; border-radius: 0; display: block; }
    .nav-links { display: flex; gap: 28px; list-style: none; align-items: center; }
    .nav-links a { text-decoration: none; color: var(--text-main); font-size: 0.86rem; font-weight: 800; transition: color 0.22s ease; }
    .nav-links a:hover, .nav-links a.is-active { color: var(--primary); }
    .dropdown { position: relative; padding-bottom: 16px; margin-bottom: -16px; }
    .dropdown-menu {
      position: absolute;
      top: calc(100% - 2px);
      left: 0;
      display: none;
      min-width: 210px;
      padding: 8px 0;
      border: 1px solid var(--border);
      border-radius: 8px;
      background: rgba(255,255,255,0.94);
      box-shadow: var(--shadow);
    }
    .dropdown:hover .dropdown-menu { display: block; }
    .dropdown-menu a { display: block; padding: 9px 20px; font-size: 0.84rem; }
    .dropdown-menu a:hover { color: var(--primary); background: rgba(233,238,255,0.72); }
    .cta-nav { color: var(--primary); font-size: 0.9rem; font-weight: 800; text-decoration: none; }
    .mobile-menu { display: none; position: relative; }
    .mobile-menu-toggle { list-style: none; width: 42px; min-height: 42px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 0; border: 1px solid var(--border); border-radius: 999px; background: rgba(255,255,255,0.86); color: var(--primary); cursor: pointer; font-size: 0.84rem; font-weight: 900; line-height: 1; }
    .mobile-menu-toggle::-webkit-details-marker { display: none; }
    .mobile-menu-icon, .mobile-menu-icon::before, .mobile-menu-icon::after { display: block; width: 16px; height: 2px; border-radius: 999px; background: currentColor; content: ""; }
    .mobile-menu-icon { position: relative; }
    .mobile-menu-icon::before, .mobile-menu-icon::after { position: absolute; left: 0; }
    .mobile-menu-icon::before { top: -5px; }
    .mobile-menu-icon::after { top: 5px; }
    .mobile-menu-panel { position: absolute; top: calc(100% + 12px); right: 0; width: min(310px, calc(100vw - 24px)); max-height: calc(100vh - 96px); overflow: auto; display: grid; gap: 6px; padding: 10px; border: 1px solid var(--border); border-radius: 12px; background: rgba(255,255,255,0.96); box-shadow: 0 20px 50px rgba(0,47,167,0.16); backdrop-filter: blur(16px); }
    .mobile-menu:not([open]) .mobile-menu-panel { display: none; }
    .mobile-menu-link, .mobile-menu-primary, .mobile-subnav a { display: flex; align-items: center; min-height: 42px; padding: 0 14px; border-radius: 8px; text-decoration: none; font-size: 0.92rem; font-weight: 850; }
    .mobile-menu-link, .mobile-menu-primary { color: var(--text-main); }
    .mobile-menu-link:hover, .mobile-menu-link:focus-visible, .mobile-menu-link.is-active, .mobile-menu-primary:hover, .mobile-menu-primary:focus-visible, .mobile-menu-primary.is-active { color: var(--primary); background: rgba(233,238,255,0.74); }
    .mobile-menu-section { display: grid; gap: 4px; padding: 4px; border: 1px solid rgba(0,47,167,0.10); border-radius: 10px; background: rgba(248,250,255,0.68); }
    .mobile-menu-primary { min-height: 40px; color: var(--primary); font-weight: 950; }
    .mobile-subnav { display: grid; gap: 2px; padding: 2px 0 4px 14px; border-left: 2px solid rgba(0,47,167,0.18); margin-left: 14px; }
    .mobile-subnav a { min-height: 36px; padding: 0 12px; color: var(--text-muted); font-size: 0.84rem; font-weight: 800; }
    .mobile-subnav a:hover, .mobile-subnav a:focus-visible { color: var(--primary); background: rgba(233,238,255,0.62); }

    .page {
      width: min(1380px, calc(100% - 48px));
      margin: 0 auto;
      padding: 128px 0 88px;
      display: grid;
      gap: 24px;
    }

    .section-tag {
      display: block;
      margin-bottom: 14px;
      color: var(--primary);
      font-size: 0.72rem;
      font-weight: 900;
      text-transform: uppercase;
      letter-spacing: 0.16em;
    }

    .hero-card,
    .article-card,
    .toc-card,
    .cta-panel {
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--paper);
      box-shadow: var(--shadow);
    }

    .hero-card {
      position: relative;
      overflow: hidden;
      padding: 54px 48px;
      background: radial-gradient(circle at 84% 18%, rgba(232,255,0,0.32), transparent 22%), linear-gradient(145deg, rgba(255,255,255,0.92), rgba(233,238,255,0.84));
    }
    .hero-card::before {
      content: "INSIGHT";
      position: absolute;
      right: 40px;
      bottom: 32px;
      color: rgba(0,47,167,0.10);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: clamp(3.8rem, 6vw, 6rem);
      font-weight: 900;
      letter-spacing: 0;
      line-height: 0.84;
    }
    .hero-copy {
      position: relative;
      z-index: 1;
      max-width: 900px;
    }
    .hero-copy h1 {
      margin-bottom: 24px;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: clamp(2.8rem, 5.4vw, 5rem);
      font-weight: 900;
      line-height: 0.96;
      letter-spacing: 0;
    }
    .hero-copy p {
      color: var(--text-muted);
      font-size: 1.06rem;
      line-height: 1.92;
    }
    .hero-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 28px;
    }
    .hero-meta span {
      display: inline-flex;
      align-items: center;
      min-height: 38px;
      padding: 0 14px;
      border: 1px solid rgba(0,47,167,0.12);
      border-radius: 999px;
      color: var(--primary);
      font-size: 0.8rem;
      font-weight: 900;
      background: rgba(255,255,255,0.78);
    }

    .content-grid {
      display: grid;
      grid-template-columns: minmax(0, 0.78fr) minmax(280px, 0.22fr);
      gap: 24px;
      align-items: start;
    }
    .article-card {
      padding: 34px 34px 40px;
      background: rgba(255,255,255,0.86);
    }
    .article-card h2 {
      margin: 48px 0 18px;
      color: var(--primary);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 1.6rem;
      font-weight: 900;
      line-height: 1.18;
      letter-spacing: 0;
    }
    .article-card h3 {
      margin: 28px 0 14px;
      font-size: 1.12rem;
      font-weight: 900;
      line-height: 1.45;
    }
    .article-card p { margin-bottom: 16px; }
    .article-card ul { margin: 0 0 18px; padding-left: 22px; color: var(--text-muted); }
    .article-card li { margin-bottom: 10px; }
    .article-card blockquote {
      margin: 26px 0;
      padding-left: 20px;
      border-left: 4px solid var(--primary);
      color: var(--primary);
      font-size: 1.26rem;
      font-weight: 900;
      line-height: 1.7;
    }

    .toc-card {
      position: sticky;
      top: 104px;
      padding: 22px 20px;
      background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(248,250,255,0.86));
    }
    .toc-card h2 {
      margin-bottom: 16px;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 1.16rem;
      font-weight: 900;
      letter-spacing: 0;
    }
    .toc-card ol {
      display: grid;
      gap: 10px;
      margin: 0;
      padding-left: 20px;
      color: var(--text-muted);
      font-size: 0.9rem;
      line-height: 1.7;
    }
    .toc-card a { text-decoration: none; }
    .toc-card a:hover { color: var(--primary); }

    .cta-panel {
      padding: 34px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      background: linear-gradient(145deg, var(--primary-deep) 0%, var(--primary) 60%, #1A46D7 100%);
      color: #fff;
    }
    .cta-panel h2 {
      color: #fff;
      margin-bottom: 10px;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 1.9rem;
      font-weight: 900;
      line-height: 1.1;
      letter-spacing: 0;
    }
    .cta-panel p { color: rgba(255,255,255,0.82); max-width: 740px; }
    .cta-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 50px;
      padding: 0 28px;
      border-radius: 10px;
      border: 1px solid rgba(21,21,21,0.16);
      background: #fff;
      color: var(--primary);
      font-weight: 900;
      text-decoration: none;
      white-space: nowrap;
    }

    @media (max-width: 1000px) {
      .content-grid { grid-template-columns: 1fr; }
      .toc-card { position: static; }
    }
    @media (max-width: 900px) {
      nav { top: 10px; left: 12px; right: 12px; padding: 0 16px; gap: 12px; }
      .logo img { width: 120px; }
      .nav-links { display: none; }
      .mobile-menu { display: block; }
      .cta-nav { display: none; }
      .page { width: calc(100% - 24px); padding-top: 104px; padding-bottom: 56px; }
      .hero-card, .article-card, .toc-card, .cta-panel { padding: 22px; }
      .hero-copy h1 { font-size: 2.6rem; }
      .cta-panel { flex-direction: column; align-items: flex-start; }
    }