:root {
      --color-bg: #ffffff;
      --color-bg-alt: #f7f7fb;
      --color-primary: #1c7ed6;
      --color-primary-dark: #1864ab;
      --color-accent: #f783ac;
      --color-text: #222222;
      --color-muted: #666666;
      --color-border: #e0e0e8;
      --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-main);
      background-color: var(--color-bg-alt);
      color: var(--color-text);
      line-height: 1.7;
    }

    a {
      color: var(--color-primary);
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }

    .page-wrapper {
      max-width: 1100px;
      margin: 0 auto;
      padding: 1.5rem 1.25rem 3rem;
    }

    header.article-header {
      background: linear-gradient(135deg, #edf2ff, #f8f0fc);
      border-radius: 18px;
      padding: 2rem 1.5rem;
      margin-bottom: 2rem;
      position: relative;
      overflow: hidden;
    }

    .article-label {
      display: inline-flex;
      align-items: center;
      padding: 0.2rem 0.75rem;
      border-radius: 999px;
      background-color: rgba(28, 126, 214, 0.08);
      font-size: 0.78rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--color-primary-dark);
      margin-bottom: 0.75rem;
    }

    .article-label-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: var(--color-primary);
      margin-right: 0.4rem;
    }

    header.article-header h1 {
      font-size: 1.8rem;
      margin: 0 0 0.75rem;
    }

    .article-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
      font-size: 0.85rem;
      color: var(--color-muted);
    }

    .meta-badge {
      background: rgba(255, 255, 255, 0.9);
      border-radius: 999px;
      padding: 0.25rem 0.75rem;
      border: 1px solid rgba(255, 255, 255, 0.8);
    }

    .hero-cta-wrapper {
      margin-top: 1.25rem;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 0.75rem;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.7rem 1.4rem;
      border-radius: 999px;
      border: none;
      background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
      color: #ffffff;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      text-decoration: none;
      box-shadow: 0 10px 20px rgba(24, 100, 171, 0.25);
      transition: transform 0.15s ease, box-shadow 0.15s ease;
      white-space: nowrap;
    }

    .btn-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 14px 30px rgba(24, 100, 171, 0.35);
      text-decoration: none;
    }

    .btn-primary span.icon-arrow {
      margin-left: 0.4rem;
      font-size: 1.1rem;
    }

    .btn-secondary-link {
      font-size: 0.9rem;
      color: var(--color-primary-dark);
      text-decoration: underline;
      text-underline-offset: 2px;
    }

    .hero-image {
      margin-top: 1.5rem;
      border-radius: 16px;
      border: 1px solid var(--color-border);
      background-color: #ffffff;
      overflow: hidden;
    }

    .hero-image img {
      display: block;
      width: 100%;
      height: auto;
    }

    .hero-image-caption {
      font-size: 0.75rem;
      color: var(--color-muted);
      padding: 0.5rem 0.75rem 0.75rem;
      background-color: #ffffff;
    }

    /* 主体布局 */
    .content-layout {
      display: grid;
      grid-template-columns: minmax(0, 1.9fr) minmax(260px, 1.1fr);
      gap: 2rem;
      align-items: flex-start;
    }

    main.article-content {
      background-color: #ffffff;
      border-radius: 18px;
      padding: 1.75rem 1.4rem;
      box-shadow: 0 18px 40px rgba(15, 23, 42, 0.04);
    }

    aside.article-aside {
      position: sticky;
      top: 1rem;
      align-self: flex-start;
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
    }

    .toc-card,
    .cta-card,
    .info-card {
      background-color: #ffffff;
      border-radius: 16px;
      padding: 1.3rem 1.15rem;
      border: 1px solid var(--color-border);
      box-shadow: 0 10px 30px rgba(15, 23, 42, 0.03);
    }

    .toc-card h3,
    .cta-card h3,
    .info-card h3 {
      font-size: 1rem;
      margin: 0 0 0.8rem;
    }

    .toc-list {
      list-style: none;
      margin: 0;
      padding: 0;
      font-size: 0.9rem;
    }

    .toc-list li {
      margin: 0.4rem 0;
    }

    .toc-list a {
      text-decoration: none;
      color: var(--color-muted);
    }

    .toc-list a:hover {
      color: var(--color-primary-dark);
    }

    .cta-card p {
      font-size: 0.9rem;
      margin-top: 0.4rem;
      margin-bottom: 0.9rem;
      color: var(--color-muted);
    }

    .cta-card .btn-primary {
      width: 100%;
      justify-content: center;
    }

    .info-card ul {
      padding-left: 1.1rem;
      margin: 0.4rem 0 0.4rem;
      font-size: 0.85rem;
    }

    .info-card ul li {
      margin-bottom: 0.25rem;
    }

    /* 文章正文排版 */
    main.article-content h2 {
      font-size: 1.35rem;
      margin-top: 1.6rem;
      margin-bottom: 0.75rem;
      border-left: 4px solid var(--color-primary);
      padding-left: 0.6rem;
    }

    main.article-content h3 {
      font-size: 1.05rem;
      margin-top: 1.2rem;
      margin-bottom: 0.4rem;
    }

    main.article-content p {
      margin: 0.4rem 0 0.8rem;
      font-size: 0.95rem;
    }

    main.article-content ul,
    main.article-content ol {
      padding-left: 1.2rem;
      font-size: 0.95rem;
      margin: 0.4rem 0 0.8rem;
    }

    main.article-content li {
      margin-bottom: 0.3rem;
    }

    .highlight-box {
      background-color: #f8f9ff;
      border-radius: 12px;
      padding: 0.9rem 0.9rem;
      border: 1px dashed var(--color-border);
      font-size: 0.9rem;
      margin: 0.9rem 0;
    }

    .key-points-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 0.8rem;
      margin: 0.8rem 0 1.1rem;
    }

    .key-point {
      background-color: #f8f9fa;
      border-radius: 12px;
      padding: 0.7rem 0.8rem;
      border: 1px solid #eceff4;
      font-size: 0.9rem;
    }

    .key-point strong {
      display: block;
      margin-bottom: 0.3rem;
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.9rem;
      margin: 1rem 0 1.2rem;
    }

    .comparison-table th,
    .comparison-table td {
      border: 1px solid #e3e5f0;
      padding: 0.6rem 0.5rem;
      vertical-align: top;
    }

    .comparison-table th {
      background-color: #f1f3ff;
      font-weight: 600;
      text-align: left;
    }

    .badge {
      display: inline-block;
      padding: 0.15rem 0.5rem;
      border-radius: 999px;
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      background-color: rgba(28, 126, 214, 0.08);
      color: var(--color-primary-dark);
    }

    .badge-success {
      background-color: rgba(34, 197, 94, 0.12);
      color: #166534;
    }

    .badge-warning {
      background-color: rgba(245, 158, 11, 0.12);
      color: #92400e;
    }

    .section-cta-bottom {
      margin-top: 2rem;
      padding-top: 1.4rem;
      border-top: 1px solid #eceff4;
      text-align: center;
    }

    .section-cta-bottom p {
      margin-bottom: 1rem;
      font-size: 0.96rem;
    }

    /* 图片模块：尺寸标注 */
    .image-block {
      margin: 1.1rem 0;
      border-radius: 14px;
      overflow: hidden;
      border: 1px solid var(--color-border);
      background-color: #ffffff;
    }

    .image-block img {
      display: block;
      width: 100%;
      height: auto;
    }

    .image-block-caption {
      font-size: 0.8rem;
      color: var(--color-muted);
      padding: 0.45rem 0.75rem 0.7rem;
    }

    /* 尺寸提示文本 */
    .image-dimensions-note {
      font-size: 0.8rem;
      color: var(--color-muted);
      margin-top: 0.25rem;
      font-style: italic;
    }

    /* Footer simple */
    footer.article-footer {
      margin-top: 2rem;
      font-size: 0.8rem;
      color: var(--color-muted);
      text-align: center;
    }

    /* Responsive : mobile-first, ajustements desktop */
    @media (min-width: 768px) {
      header.article-header {
        padding: 2.3rem 2rem;
      }

      header.article-header h1 {
        font-size: 2rem;
        max-width: 70%;
      }

      .hero-cta-wrapper {
        margin-top: 1.6rem;
      }

      .hero-image {
        margin-top: 1.8rem;
      }

      main.article-content {
        padding: 2rem 1.8rem;
      }
    }

    @media (max-width: 860px) {
      .content-layout {
        grid-template-columns: minmax(0, 1fr);
      }

      aside.article-aside {
        position: static;
      }
    }

    @media (max-width: 480px) {
      .page-wrapper {
        padding-inline: 1rem;
      }

      header.article-header {
        padding: 1.6rem 1.2rem;
      }

      header.article-header h1 {
        font-size: 1.4rem;
      }

      .hero-cta-wrapper {
        flex-direction: column;
        align-items: flex-start;
      }

      .btn-primary {
        width: 100%;
      }
    }