*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --blue: #575AFF;
      --yellow: #FFBE11;
      --dark: #0D0D1A;
      --gray-700: #3D3D5C;
      --gray-500: #7B7B9A;
      --gray-200: #E4E4EF;
      --gray-100: #F4F4F8;
      --white: #FFFFFF;
      --radius: 6px;
      --font: 'Onest', sans-serif;
    }
    html { scroll-behavior: smooth; }
    body { font-family: var(--font); background: var(--white); color: var(--dark); line-height: 1.6; -webkit-font-smoothing: antialiased; }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 40px; }

    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      background: rgba(255,255,255,0.96); backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--gray-200);
    }
    .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
    .nav-logo img { height: 36px; display: block; }
    .nav-links { display: flex; gap: 36px; list-style: none; }
    .nav-links a { text-decoration: none; color: var(--gray-700); font-size: 14px; font-weight: 500; transition: color 0.2s; }
    .nav-links a:hover, .nav-links a.active { color: var(--blue); }
    .nav-cta {
      background: var(--blue); color: var(--white); padding: 10px 24px;
      font-size: 14px; font-weight: 600; border-radius: var(--radius);
      text-decoration: none; transition: background 0.2s, transform 0.15s;
    }
    .nav-cta:hover { background: #4244e0; transform: translateY(-1px); }

    /* Reading progress bar */
    .progress-bar { position: fixed; top: 71px; left: 0; height: 2px; background: var(--blue); z-index: 99; transition: width 0.1s; }

    /* HERO */
    #post-hero {
      padding: 120px 0 56px; background: var(--dark); position: relative; overflow: hidden;
    }
    .hero-grid {
      position: absolute; inset: 0; opacity: 0.04;
      background-image:
        linear-gradient(rgba(87,90,255,1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(87,90,255,1) 1px, transparent 1px);
      background-size: 48px 48px;
    }
    .hero-glow {
      position: absolute; top: -100px; right: -100px; width: 400px; height: 400px;
      border-radius: 50%; background: radial-gradient(circle, rgba(87,90,255,0.25), transparent 70%);
    }
    .hero-glow2 {
      position: absolute; bottom: -80px; left: -60px; width: 240px; height: 240px;
      border-radius: 50%; background: radial-gradient(circle, rgba(255,190,17,0.15), transparent 70%);
    }
    .hero-inner { position: relative; z-index: 1; }
    .breadcrumb {
      display: flex; align-items: center; gap: 8px;
      font-size: 12px; color: rgba(255,255,255,0.3); margin-bottom: 32px;
    }
    .breadcrumb a { color: rgba(255,255,255,0.3); text-decoration: none; transition: color 0.2s; }
    .breadcrumb a:hover { color: rgba(255,255,255,0.6); }
    .breadcrumb span { color: rgba(255,255,255,0.12); }
    .post-meta-row { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
    .post-tag {
      font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
      color: var(--yellow); border: 1px solid rgba(255,190,17,0.3);
      background: rgba(255,190,17,0.08); border-radius: 2px; padding: 4px 10px;
    }
    .meta-dot-text { font-size: 13px; color: rgba(255,255,255,0.4); display: flex; align-items: center; gap: 8px; }
    .post-h1 {
      font-size: clamp(36px, 4.5vw, 56px); font-weight: 800;
      line-height: 1.08; letter-spacing: -0.03em; color: var(--white);
      margin-bottom: 24px; max-width: 820px;
    }
    .post-lead { font-size: 19px; color: rgba(255,255,255,0.6); line-height: 1.65; max-width: 720px; margin-bottom: 40px; }
    .author-row { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-top: 32px; border-top: 1px solid rgba(255,255,255,0.1); flex-wrap: wrap; }
    .author { display: flex; align-items: center; gap: 14px; }
    .author-av {
      width: 44px; height: 44px; border-radius: 50%; background: var(--blue);
      display: flex; align-items: center; justify-content: center;
      font-size: 14px; font-weight: 700; color: var(--white); flex-shrink: 0;
    }
    .author-info-name { font-size: 14px; font-weight: 600; color: var(--white); margin-bottom: 2px; }
    .author-info-role { font-size: 12px; color: rgba(255,255,255,0.4); }
    .post-actions { display: flex; gap: 8px; }
    .post-action {
      display: inline-flex; align-items: center; gap: 6px;
      font-size: 12px; font-weight: 500; color: rgba(255,255,255,0.7);
      padding: 8px 14px; border: 1px solid rgba(255,255,255,0.15);
      background: rgba(255,255,255,0.04); border-radius: var(--radius);
      cursor: pointer; transition: background 0.2s, border-color 0.2s; text-decoration: none;
    }
    .post-action:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.3); }

    /* MAIN LAYOUT */
    #post-body { padding: 64px 0 80px; }
    .post-grid { display: grid; grid-template-columns: 220px 1fr 280px; gap: 48px; align-items: start; }

    /* TOC sidebar (left) */
    .toc-side { position: sticky; top: 110px; }
    .toc-label {
      font-size: 10px; font-weight: 700; letter-spacing: 0.12em;
      text-transform: uppercase; color: var(--gray-500); margin-bottom: 16px;
    }
    .toc-list { list-style: none; border-left: 1px solid var(--gray-200); }
    .toc-list a {
      display: block; padding: 8px 16px; font-size: 13px; color: var(--gray-700);
      text-decoration: none; border-left: 2px solid transparent; margin-left: -1px;
      transition: color 0.2s, border-color 0.2s; line-height: 1.5;
    }
    .toc-list a:hover { color: var(--blue); }
    .toc-list a.active { color: var(--blue); border-left-color: var(--blue); font-weight: 600; }

    /* Article content */
    .article {
      font-size: 17px; line-height: 1.8; color: var(--gray-700);
      max-width: 720px;
    }
    .article h2 {
      font-size: 30px; font-weight: 800; color: var(--dark);
      letter-spacing: -0.02em; line-height: 1.2; margin: 56px 0 20px;
      scroll-margin-top: 120px;
    }
    .article h2:first-child { margin-top: 0; }
    .article h3 {
      font-size: 21px; font-weight: 700; color: var(--dark);
      letter-spacing: -0.015em; line-height: 1.3; margin: 36px 0 16px;
    }
    .article p { margin-bottom: 20px; }
    .article p strong { color: var(--dark); font-weight: 600; }
    .article a { color: var(--blue); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
    .article ul, .article ol { margin: 0 0 24px; padding-left: 24px; }
    .article li { margin-bottom: 8px; }

    /* Article elements */
    .pull-quote {
      border-left: 3px solid var(--blue); padding: 8px 0 8px 28px;
      margin: 32px 0; font-size: 22px; font-weight: 600; color: var(--dark);
      line-height: 1.4; letter-spacing: -0.01em; font-style: normal;
    }
    .pull-quote-author {
      font-size: 13px; font-weight: 500; color: var(--gray-500);
      margin-top: 12px; font-style: normal;
    }

    .info-box {
      border: 1px solid var(--gray-200); border-radius: var(--radius);
      padding: 24px 28px; margin: 32px 0; background: var(--gray-100);
    }
    .info-box-label { font-size: 10px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--blue); margin-bottom: 12px; }
    .info-box h4 { font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 8px; letter-spacing: -0.01em; }
    .info-box p { font-size: 14px; color: var(--gray-700); margin: 0; }

    .stats-row {
      display: grid; grid-template-columns: repeat(3, 1fr);
      border: 1px solid var(--gray-200); border-radius: var(--radius);
      overflow: hidden; margin: 32px 0; background: var(--gray-200);
      gap: 1px;
    }
    .stat-box { background: var(--white); padding: 24px; }
    .stat-box-num { font-size: 32px; font-weight: 800; color: var(--blue); letter-spacing: -0.03em; line-height: 1; margin-bottom: 8px; }
    .stat-box-label { font-size: 12px; color: var(--gray-700); line-height: 1.5; }

    /* Diagram block — content cluster visualization */
    .diagram-block {
      border: 1px solid var(--gray-200); border-radius: var(--radius);
      padding: 32px; margin: 32px 0; background: var(--white);
    }
    .diagram-caption { font-size: 12px; color: var(--gray-500); text-align: center; margin-top: 16px; letter-spacing: 0.02em; }

    /* Code/example block */
    .example-block {
      background: var(--dark); border-radius: var(--radius); padding: 24px 28px;
      margin: 28px 0; color: rgba(255,255,255,0.85); font-size: 14px; line-height: 1.7;
      font-family: ui-monospace, 'SF Mono', Menlo, monospace;
    }
    .example-block-label {
      font-size: 10px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
      color: var(--yellow); margin-bottom: 12px; font-family: var(--font);
    }
    .example-block .yel { color: var(--yellow); }
    .example-block .blu { color: #8C8FFF; }
    .example-block .gry { color: rgba(255,255,255,0.4); }

    /* Right sidebar */
    .post-aside { position: sticky; top: 110px; display: flex; flex-direction: column; gap: 20px; }

    .aside-card {
      border: 1px solid var(--gray-200); border-radius: var(--radius); overflow: hidden;
    }
    .aside-card-header {
      font-size: 10px; font-weight: 700; letter-spacing: 0.12em;
      text-transform: uppercase; color: var(--gray-500);
      padding: 12px 18px; background: var(--gray-100);
      border-bottom: 1px solid var(--gray-200);
    }
    .author-card-body { padding: 20px; display: flex; flex-direction: column; gap: 16px; }
    .author-card-info { display: flex; align-items: center; gap: 12px; }
    .author-card-av {
      width: 48px; height: 48px; border-radius: 50%; background: var(--blue);
      display: flex; align-items: center; justify-content: center;
      font-size: 15px; font-weight: 700; color: var(--white); flex-shrink: 0;
    }
    .author-card-name { font-size: 14px; font-weight: 700; color: var(--dark); margin-bottom: 2px; }
    .author-card-role { font-size: 12px; color: var(--gray-500); }
    .author-card-bio { font-size: 13px; color: var(--gray-700); line-height: 1.6; }
    .author-card-stat { display: flex; justify-content: space-between; align-items: center; padding-top: 12px; border-top: 1px solid var(--gray-200); }
    .author-stat-num { font-size: 13px; font-weight: 600; color: var(--dark); }
    .author-stat-label { font-size: 11px; color: var(--gray-500); }

    .related-list { padding: 0; }
    .related-row {
      padding: 14px 18px; border-bottom: 1px solid var(--gray-200);
      cursor: pointer; transition: background 0.15s; text-decoration: none; display: block;
    }
    .related-row:last-child { border-bottom: none; }
    .related-row:hover { background: var(--gray-100); }
    .related-tag {
      font-size: 10px; font-weight: 600; color: var(--blue); letter-spacing: 0.06em;
      text-transform: uppercase; margin-bottom: 6px;
    }
    .related-title { font-size: 13px; font-weight: 600; color: var(--dark); line-height: 1.4; margin-bottom: 4px; }
    .related-meta { font-size: 11px; color: var(--gray-500); }

    .cta-aside {
      background: var(--blue); color: var(--white);
      border-radius: var(--radius); padding: 24px;
    }
    .cta-aside-label { font-size: 10px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin-bottom: 10px; }
    .cta-aside h4 { font-size: 16px; font-weight: 800; color: var(--white); letter-spacing: -0.015em; line-height: 1.3; margin-bottom: 8px; }
    .cta-aside p { font-size: 12px; color: rgba(255,255,255,0.65); line-height: 1.5; margin-bottom: 16px; }
    .cta-aside-btn {
      display: block; text-align: center;
      background: var(--white); color: var(--blue);
      padding: 11px; font-size: 13px; font-weight: 700;
      border-radius: var(--radius); text-decoration: none;
      transition: background 0.2s;
    }
    .cta-aside-btn:hover { background: rgba(255,255,255,0.92); }

    /* Tags row */
    .tags-row {
      max-width: 720px; display: flex; gap: 8px; flex-wrap: wrap;
      padding: 32px 0; border-top: 1px solid var(--gray-200);
      margin-top: 48px;
    }
    .tag-chip {
      font-size: 12px; font-weight: 500; color: var(--gray-700);
      border: 1px solid var(--gray-200); border-radius: 2px; padding: 5px 12px;
      background: var(--gray-100); cursor: pointer; transition: all 0.15s;
    }
    .tag-chip:hover { border-color: var(--blue); color: var(--blue); }

    /* Author block (full) */
    .author-full {
      max-width: 720px; padding: 32px; border: 1px solid var(--gray-200);
      border-radius: var(--radius); display: flex; gap: 24px; align-items: flex-start;
      margin: 16px 0 56px;
    }
    .author-full-av {
      width: 64px; height: 64px; border-radius: 50%; background: var(--blue);
      display: flex; align-items: center; justify-content: center;
      font-size: 20px; font-weight: 700; color: var(--white); flex-shrink: 0;
    }
    .author-full-info { flex: 1; }
    .author-full-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; flex-wrap: wrap; gap: 12px; }
    .author-full h4 { font-size: 18px; font-weight: 700; color: var(--dark); letter-spacing: -0.01em; }
    .author-full-role { font-size: 13px; color: var(--gray-500); margin-bottom: 12px; }
    .author-full-bio { font-size: 14px; color: var(--gray-700); line-height: 1.7; }
    .author-follow {
      font-size: 12px; font-weight: 600; color: var(--blue);
      padding: 8px 14px; border: 1px solid var(--gray-200); border-radius: var(--radius);
      cursor: pointer; transition: border-color 0.2s, background 0.2s; background: var(--white);
      font-family: var(--font);
    }
    .author-follow:hover { border-color: var(--blue); background: rgba(87,90,255,0.04); }

    /* RELATED POSTS */
    #related { padding: 80px 0; background: var(--gray-100); border-top: 1px solid var(--gray-200); }
    .related-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 32px; }
    .related-h2 { font-size: clamp(24px, 2.8vw, 36px); font-weight: 800; color: var(--dark); letter-spacing: -0.025em; }
    .related-link { font-size: 13px; font-weight: 600; color: var(--blue); text-decoration: none; display: inline-flex; align-items: center; gap: 4px; transition: gap 0.2s; }
    .related-link:hover { gap: 8px; }
    .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .related-card {
      background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius);
      overflow: hidden; cursor: pointer; transition: box-shadow 0.2s, border-color 0.2s;
      text-decoration: none; color: inherit; display: flex; flex-direction: column;
    }
    .related-card:hover { box-shadow: 0 6px 28px rgba(0,0,0,0.07); border-color: var(--blue); }
    .related-card-visual {
      aspect-ratio: 16/9; position: relative; overflow: hidden;
      display: flex; align-items: center; justify-content: center;
    }
    .related-card-visual--seo { background: linear-gradient(135deg, #0D0D1A 0%, #1a1a3e 100%); }
    .related-card-visual--perf { background: linear-gradient(135deg, #0d1a0d 0%, #1a3e1a 100%); }
    .related-card-visual--analytics { background: linear-gradient(135deg, #1a0d0d 0%, #3e1a1a 100%); }
    .related-card-visual svg { opacity: 0.18; }
    .related-card-body { padding: 22px 22px 24px; flex: 1; display: flex; flex-direction: column; }
    .related-card-meta { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
    .rcm-tag { font-size: 10px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--blue); border: 1px solid rgba(87,90,255,0.2); background: rgba(87,90,255,0.04); border-radius: 2px; padding: 2px 7px; }
    .rcm-date { font-size: 11px; color: var(--gray-500); }
    .related-card h3 { font-size: 15px; font-weight: 700; color: var(--dark); letter-spacing: -0.01em; line-height: 1.35; margin-bottom: 8px; }
    .related-card p { font-size: 13px; color: var(--gray-700); line-height: 1.6; flex: 1; margin-bottom: 16px; }
    .related-card-footer { display: flex; align-items: center; justify-content: space-between; padding-top: 12px; border-top: 1px solid var(--gray-200); }
    .related-card-author { font-size: 11px; color: var(--gray-500); }
    .related-card-read { font-size: 11px; color: var(--gray-500); }

    footer { background: var(--dark); padding: 48px 0; border-top: 1px solid rgba(255,255,255,0.06); }
    .footer-inner { display: flex; justify-content: space-between; align-items: center; }
    .footer-logo img { height: 28px; opacity: 0.8; filter: brightness(0) invert(1); }
    .footer-copy { font-size: 13px; color: rgba(255,255,255,0.35); }
    .footer-links { display: flex; gap: 32px; }
    .footer-links a { font-size: 13px; color: rgba(255,255,255,0.4); text-decoration: none; transition: color 0.2s; }
    .footer-links a:hover { color: var(--white); }

    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      #post-hero { padding: 100px 0 40px; }
      .post-h1 { font-size: 28px; }
      .post-lead { font-size: 16px; }
      .post-grid { grid-template-columns: 1fr; gap: 24px; }
      .toc-side { display: none; }
      .post-aside { display: none; }
      .article { max-width: 100%; font-size: 16px; }
      .article h2 { font-size: 24px; margin-top: 36px; }
      .article h3 { font-size: 18px; }
      .pull-quote { font-size: 18px; padding-left: 20px; }
      .stats-row { grid-template-columns: 1fr; }
      .stat-box { padding: 16px; }
      .author-full { flex-direction: column; padding: 24px; gap: 16px; }
      #related { padding: 48px 0; }
      .related-grid { grid-template-columns: 1fr; gap: 16px; }
      #post-body { padding: 40px 0 48px; }
      .author-row { flex-direction: column; align-items: flex-start; gap: 16px; }
      .post-actions { width: 100%; }
      .post-action { flex: 1; justify-content: center; }
      .nav-cta { display: none; }
      .nav-links { gap: 16px; }
      .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
      .footer-links { flex-wrap: wrap; justify-content: center; gap: 16px; }
    }