.seo-timeline-page {
      --bg: #0b1020;
      --panel: #121a31;
      --panel-2: #172240;
      --text: #ecf1ff;
      --muted: #9fb0d9;
      --line: rgba(255,255,255,0.12);
      --accent: #7dd3fc;
      --accent-2: #a78bfa;
      --good: #86efac;
      --warn: #fcd34d;
      --bad: #fca5a5;
      --max: 1360px;
    }

    .seo-timeline-page * { box-sizing: border-box; }
    .seo-timeline-page { scroll-behavior: smooth; }
    .seo-timeline-page {
      margin: 0;
      padding-top: 74px;
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background:
        radial-gradient(circle at top left, rgba(125,211,252,0.12), transparent 28%),
        radial-gradient(circle at top right, rgba(167,139,250,0.10), transparent 26%),
        var(--bg);
      color: var(--text);
      line-height: 1.6;
    }

    .seo-timeline-page .hero {
      min-height: 92vh;
      display: grid;
      place-items: center;
      padding: 40px 24px;
      border-bottom: 1px solid var(--line);
    }

    .seo-timeline-page .hero-inner {
      width: 100%;
      max-width: var(--max);
      text-align: left;
    }

    .seo-timeline-page .eyebrow {
      display: inline-block;
      font-size: 0.9rem;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 18px;
    }

    .seo-timeline-page h1 {
      margin: 0 0 18px;
      font-size: clamp(2.6rem, 6vw, 5.4rem);
      line-height: 0.98;
      max-width: 900px;
    }

    .seo-timeline-page .hero p {
      margin: 0;
      max-width: 920px;
      font-size: clamp(1.05rem, 2vw, 1.3rem);
      color: var(--muted);
    }

    .seo-timeline-page .intro-grid {
      margin-top: 34px;
      display: grid;
      grid-template-columns: repeat(3, minmax(0,1fr));
      gap: 16px;
    }

    .seo-timeline-page .intro-card {
      background: rgba(255,255,255,0.04);
      border: 1px solid var(--line);
      border-radius: 18px;
      padding: 18px;
      backdrop-filter: blur(8px);
    }

    .seo-timeline-page .intro-card strong {
      display: block;
      margin-bottom: 6px;
      color: var(--text);
    }

    .seo-timeline-page .wrap {
      width: 100%;
      max-width: var(--max);
      margin: 0 auto;
      padding: 0 32px 80px;
      position: relative;
    }

    .seo-timeline-page .timeline-layout {
      display: grid;
      grid-template-columns: 1fr 220px;
      gap: 28px;
      align-items: start;
    }

    .seo-timeline-page .timeline {
      order: 1;
    }

    .seo-timeline-page .timeline-toc {
      order: 2;
      position: sticky;
      top: 108px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: rgba(255, 255, 255, 0.03);
      padding: 14px;
    }

    .seo-timeline-page .timeline-toc-title {
      margin: 0 0 10px;
      color: var(--muted);
      font-size: 0.78rem;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      font-weight: 700;
    }

    .seo-timeline-page .timeline-toc ul {
      list-style: none;
      margin: 0;
      padding: 0;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .seo-timeline-page .timeline-toc a {
      text-decoration: none;
      display: inline-block;
    }

    .seo-timeline-page .year-chip {
      display: inline-flex;
      align-items: center;
      min-height: 30px;
      padding: 0 10px;
      border-radius: 999px;
      border: 1px solid var(--line);
      color: var(--muted);
      font-size: 0.83rem;
      font-weight: 600;
      transition: color 200ms ease, border-color 200ms ease, background-color 200ms ease, box-shadow 200ms ease;
    }

    .seo-timeline-page .timeline-toc a:hover .year-chip,
    .seo-timeline-page .timeline-toc a.is-active .year-chip {
      color: #39ff12;
      border-color: rgba(57, 255, 18, 0.5);
      background: rgba(57, 255, 18, 0.1);
      box-shadow: 0 0 0 3px rgba(57, 255, 18, 0.12);
    }

    .seo-timeline-page .timeline {
      position: relative;
      padding: 36px 0 0 0;
    }

    .seo-timeline-page .timeline::before {
      content: "";
      position: absolute;
      left: 156px;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(to bottom, rgba(125,211,252,0.35), rgba(167,139,250,0.35));
    }

    .seo-timeline-page .chapter {
      position: relative;
      display: grid;
      grid-template-columns: 126px 1fr;
      gap: 34px;
      padding: 46px 0;
      content-visibility: auto;
      contain-intrinsic-size: 1px 760px;
    }

    .seo-timeline-page .year {
      position: relative;
      text-align: right;
      padding-right: 26px;
      color: var(--accent);
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 0.02em;
    }

    .seo-timeline-page .chapter.is-active .year {
      color: #39ff12;
    }

    .seo-timeline-page .year::after {
      content: "";
      position: absolute;
      top: 6px;
      right: -9px;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--accent), var(--accent-2));
      box-shadow: 0 0 0 6px rgba(125,211,252,0.08);
    }

    .seo-timeline-page .card {
      background: linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0.025));
      border: 1px solid var(--line);
      border-radius: 22px;
      overflow: hidden;
      box-shadow: 0 20px 60px rgba(0,0,0,0.25);
    }

    .seo-timeline-page .card-inner {
      padding: 28px;
    }

    .seo-timeline-page .kicker {
      display: inline-block;
      font-size: 0.82rem;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--accent);
      margin-bottom: 10px;
    }

    .seo-timeline-page h2 {
      margin: 0 0 10px;
      font-size: clamp(1.7rem, 3vw, 2.5rem);
      line-height: 1.05;
    }

    .seo-timeline-page .summary {
      margin: 0 0 22px;
      color: var(--muted);
      max-width: 980px;
      font-size: 1.02rem;
    }

    .seo-timeline-page .visual {
      margin: 0 0 24px;
      border: 1px solid var(--line);
      background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
      border-radius: 18px;
      padding: 18px;
    }

    .seo-timeline-page .search-ui {
      background: #f8fbff;
      border-radius: 16px;
      padding: 14px;
      color: #15213f;
      box-shadow: inset 0 0 0 1px rgba(0,0,0,0.06);
    }

    .seo-timeline-page .search-bar {
      height: 44px;
      border-radius: 999px;
      background: white;
      border: 1px solid rgba(0,0,0,0.12);
      display: flex;
      align-items: center;
      padding: 0 16px;
      color: #6b7280;
      margin-bottom: 14px;
      font-size: 0.95rem;
    }

    .seo-timeline-page .result {
      padding: 11px 0;
      border-bottom: 1px solid rgba(0,0,0,0.06);
    }

    .seo-timeline-page .result:last-child { border-bottom: 0; }
    .seo-timeline-page .r-url { color: #15803d; font-size: 0.82rem; }
    .seo-timeline-page .r-title { color: #1d4ed8; font-size: 1rem; margin: 2px 0; }
    .seo-timeline-page .r-desc { color: #4b5563; font-size: 0.9rem; }

    .seo-timeline-page .three {
      display: grid;
      grid-template-columns: repeat(3, minmax(0,1fr));
      gap: 14px;
      margin-bottom: 24px;
    }

    .seo-timeline-page .pillars {
      background: var(--panel);
      border: 1px solid var(--line);
      border-radius: 16px;
      padding: 16px;
    }

    .seo-timeline-page .pillars h3 {
      margin: 0 0 8px;
      font-size: 1rem;
    }

    .seo-timeline-page .pillars p {
      margin: 0;
      color: var(--muted);
      font-size: 0.94rem;
    }

    .seo-timeline-page .factors {
      background: var(--panel-2);
      border-top: 1px solid var(--line);
      padding: 24px 28px 28px;
    }

    .seo-timeline-page .factors h3 {
      margin: 0 0 14px;
      font-size: 1.05rem;
    }

    .seo-timeline-page .factor {
      display: grid;
      grid-template-columns: 140px 1fr 46px;
      gap: 14px;
      align-items: center;
      margin: 12px 0;
    }

    .seo-timeline-page .factor label {
      color: var(--muted);
      font-size: 0.95rem;
    }

    .seo-timeline-page .bar {
      height: 10px;
      border-radius: 999px;
      background: rgba(255,255,255,0.08);
      overflow: hidden;
      position: relative;
    }

    .seo-timeline-page .fill {
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--accent), var(--accent-2));
    }

    .seo-timeline-page .factor.factor-tech-seo .fill {
      background: #39ff12;
    }

    .seo-timeline-page .factors-note {
      margin: 14px 0 0;
      color: var(--muted);
      font-size: 0.9rem;
    }

    .seo-timeline-page .value {
      text-align: right;
      color: var(--text);
      font-size: 0.9rem;
      font-weight: 600;
    }

    .seo-timeline-page .footer-note {
      padding: 32px 0 80px;
      color: var(--muted);
      font-size: 0.94rem;
      max-width: 1040px;
    }

    @media (max-width: 920px) {
      .seo-timeline-page .timeline-layout {
        display: block;
      }

      .seo-timeline-page .timeline-toc {
        display: none;
      }

      /* Hide decorative search mock visuals on mobile to keep the page tighter and easier to scan. */
      .seo-timeline-page .visual {
        display: none;
      }

      .seo-timeline-page .intro-grid,
      .seo-timeline-page .three {
        grid-template-columns: 1fr;
      }

      .seo-timeline-page .timeline::before {
        left: 18px;
      }

      .seo-timeline-page .chapter {
        grid-template-columns: 1fr;
        gap: 14px;
        padding-left: 32px;
      }

      .seo-timeline-page .year {
        text-align: left;
        padding-right: 0;
        padding-left: 8px;
      }

      .seo-timeline-page .year::after {
        left: -22px;
        right: auto;
      }

      .seo-timeline-page .factor {
        grid-template-columns: 1fr;
        gap: 8px;
        margin: 16px 0;
      }

      .seo-timeline-page .value {
        text-align: left;
        font-size: 0.95rem;
      }

      .seo-timeline-page .factor label {
        color: var(--text);
        font-size: 1rem;
        font-weight: 600;
      }

      .seo-timeline-page .bar {
        height: 12px;
      }
    }

.seo-timeline-page .factor .fill {
  width: 0;
  transition: width 900ms cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-reduced-motion: reduce) {
  .seo-timeline-page .factor .fill {
    transition: none;
  }
}