:root {
      --bg: #08111f;
      --bg-soft: #0d1728;
      --panel: #101d30;
      --panel-2: #13233a;
      --text: #f4f7fb;
      --muted: #aab8cb;
      --line: rgba(255,255,255,.10);
      --brand: #56c2ff;
      --brand-2: #7ce0c3;
      --accent: #d9ff72;
      --ink: #0b1220;
      --white: #ffffff;
      --shadow: 0 24px 60px rgba(0,0,0,.25);
      --radius: 24px;
      --max: 1160px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(86,194,255,.14), transparent 32rem),
        radial-gradient(circle at 88% 28%, rgba(124,224,195,.10), transparent 30rem),
        var(--bg);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a { color: inherit; }
    img { max-width: 100%; }
    button, input, textarea, select { font: inherit; }
    :focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

    .container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 16px;
      color: var(--brand-2);
      font-size: .79rem;
      font-weight: 800;
      letter-spacing: .12em;
      text-transform: uppercase;
    }
    .eyebrow::before { content: ""; width: 26px; height: 2px; background: currentColor; }

    header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(8,17,31,.82);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(18px);
    }
    .nav {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      font-weight: 900;
      letter-spacing: -.03em;
    }
    .brand-mark {
      width: 38px;
      height: 38px;
      border-radius: 11px;
      display: grid;
      place-items: center;
      background: linear-gradient(135deg, var(--brand), var(--brand-2));
      color: var(--ink);
      font-weight: 1000;
    }
    .brand small { display: block; color: var(--muted); font-size: .7rem; font-weight: 600; letter-spacing: .04em; }
    nav ul { display: flex; align-items: center; gap: 24px; list-style: none; margin: 0; padding: 0; }
    nav a { color: #dce6f3; text-decoration: none; font-size: .94rem; font-weight: 650; }
    nav a:hover { color: var(--white); }
    .nav-cta {
      padding: 10px 16px;
      border-radius: 999px;
      background: var(--white);
      color: var(--ink) !important;
    }
    .menu-btn { display: none; background: transparent; color: var(--white); border: 1px solid var(--line); border-radius: 10px; padding: 8px 11px; }

    .hero { padding: 92px 0 64px; overflow: hidden; }
    .hero-grid { display: grid; grid-template-columns: 1.12fr .88fr; gap: 56px; align-items: center; }
    h1 {
      font-size: clamp(2.7rem, 6vw, 5.4rem);
      line-height: .98;
      letter-spacing: -.06em;
      margin: 0 0 24px;
      max-width: 900px;
    }
    h1 .highlight { color: var(--brand); }
    .lead { max-width: 760px; color: #c4d1e2; font-size: clamp(1.08rem, 2vw, 1.28rem); }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      min-height: 50px;
      padding: 0 20px;
      border-radius: 14px;
      text-decoration: none;
      font-weight: 800;
      border: 1px solid transparent;
      cursor: pointer;
    }
    .btn-primary { background: linear-gradient(135deg, var(--brand), #8ed8ff); color: var(--ink); }
    .btn-secondary { background: rgba(255,255,255,.04); color: var(--white); border-color: var(--line); }
    .hero-note { margin-top: 22px; color: var(--muted); font-size: .89rem; }

    .flow-card {
      position: relative;
      padding: 28px;
      border: 1px solid var(--line);
      border-radius: 28px;
      background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.025));
      box-shadow: var(--shadow);
    }
    .flow-card::before {
      content: "";
      position: absolute;
      inset: -1px;
      border-radius: inherit;
      padding: 1px;
      background: linear-gradient(140deg, rgba(86,194,255,.6), transparent 45%, rgba(124,224,195,.35));
      -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      pointer-events: none;
    }
    .flow-title { font-weight: 850; font-size: 1.05rem; margin-bottom: 18px; }
    .flow { display: grid; gap: 10px; }
    .flow-step {
      display: grid;
      grid-template-columns: 44px 1fr;
      gap: 13px;
      align-items: center;
      padding: 13px;
      border: 1px solid var(--line);
      border-radius: 16px;
      background: rgba(8,17,31,.55);
    }
    .flow-step span:first-child {
      width: 40px; height: 40px; display: grid; place-items: center;
      border-radius: 12px; background: rgba(86,194,255,.12); color: var(--brand); font-weight: 900;
    }
    .flow-step strong { display: block; font-size: .94rem; }
    .flow-step small { display: block; color: var(--muted); }

    .trust-strip { padding: 18px 0 72px; }
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1px;
      overflow: hidden;
      border: 1px solid var(--line);
      border-radius: 22px;
      background: var(--line);
    }
    .trust-item { background: var(--bg-soft); padding: 22px; }
    .trust-item strong { display: block; font-size: 1rem; }
    .trust-item span { color: var(--muted); font-size: .91rem; }

    section { padding: 88px 0; }
    .section-head { max-width: 780px; margin-bottom: 42px; }
    h2 { margin: 0 0 16px; font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.05; letter-spacing: -.045em; }
    .section-head p { margin: 0; color: var(--muted); font-size: 1.08rem; }

    .update-section { background: rgba(255,255,255,.025); border-block: 1px solid var(--line); }
    .timeline { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .milestone { position: relative; padding: 26px; border: 1px solid var(--line); border-radius: 20px; background: var(--panel); }
    .milestone time { display: block; font-size: 1.4rem; font-weight: 900; color: var(--brand); margin-bottom: 8px; }
    .milestone p { margin: 0; color: var(--muted); }
    .source-note { margin-top: 20px; color: var(--muted); font-size: .87rem; }
    .source-note a { color: #dbefff; }

    .solutions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .solution {
      position: relative;
      padding: 34px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: linear-gradient(180deg, rgba(19,35,58,.95), rgba(13,23,40,.95));
      overflow: hidden;
    }
    .solution.featured { border-color: rgba(86,194,255,.45); }
    .badge { display: inline-flex; padding: 6px 10px; border-radius: 999px; font-size: .74rem; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; background: rgba(124,224,195,.12); color: var(--brand-2); }
    .solution h3 { margin: 18px 0 8px; font-size: 1.65rem; letter-spacing: -.025em; }
    .solution .subtitle { color: var(--muted); margin: 0 0 22px; }
    .solution ul { display: grid; gap: 11px; padding: 0; margin: 0; list-style: none; }
    .solution li { display: grid; grid-template-columns: 20px 1fr; gap: 10px; color: #d7e2ef; }
    .solution li::before { content: "✓"; color: var(--brand-2); font-weight: 900; }
    .solution .ideal { margin-top: 26px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: .92rem; }
    .solution .ideal strong { color: var(--white); }

    .architecture { display: grid; grid-template-columns: .9fr 1.1fr; gap: 40px; align-items: center; }
    .architecture p { color: var(--muted); }
    .arch-board { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
    .arch-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; align-items: stretch; }
    .arch-node { min-height: 90px; display: grid; place-items: center; text-align: center; padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: var(--bg-soft); font-weight: 750; }
    .arch-node.emphasis { background: linear-gradient(135deg, rgba(86,194,255,.13), rgba(124,224,195,.09)); border-color: rgba(86,194,255,.34); }
    .arch-arrow { text-align: center; color: var(--brand); font-size: 1.5rem; padding: 8px; }
    .arch-wide { margin-top: 12px; }

    .comparison-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
    table { width: 100%; border-collapse: collapse; min-width: 760px; background: var(--panel); }
    th, td { padding: 18px 20px; text-align: left; border-bottom: 1px solid var(--line); }
    th { color: var(--white); background: rgba(255,255,255,.035); font-size: .9rem; }
    td { color: #cbd7e6; }
    tr:last-child td { border-bottom: 0; }

    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .step { padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
    .step .n { display: inline-grid; width: 34px; height: 34px; place-items: center; border-radius: 10px; background: var(--brand); color: var(--ink); font-weight: 900; }
    .step h3 { margin: 18px 0 8px; font-size: 1.08rem; }
    .step p { margin: 0; color: var(--muted); font-size: .92rem; }

    .faq { display: grid; gap: 12px; }
    details { border: 1px solid var(--line); border-radius: 16px; background: var(--panel); padding: 0 20px; }
    summary { cursor: pointer; padding: 19px 0; font-weight: 800; }
    details p { color: var(--muted); margin: 0 0 20px; max-width: 880px; }

    .contact {
      padding: 0 0 96px;
    }
    .contact-card {
      display: grid;
      grid-template-columns: .88fr 1.12fr;
      gap: 34px;
      padding: 40px;
      border-radius: 30px;
      background: linear-gradient(135deg, #dff6ff, #c7f6e8 68%, #e9ffc0);
      color: var(--ink);
      box-shadow: var(--shadow);
    }
    .contact-card h2 { color: var(--ink); }
    .contact-card p { color: #334258; }
    .contact-links { display: grid; gap: 10px; margin-top: 24px; }
    .contact-links a { width: fit-content; color: var(--ink); font-weight: 800; text-decoration-thickness: 1px; text-underline-offset: 4px; }
    form { display: grid; gap: 12px; padding: 22px; border-radius: 20px; background: rgba(255,255,255,.63); border: 1px solid rgba(11,18,32,.1); }
    label { font-size: .82rem; font-weight: 800; }
    input, textarea, select {
      width: 100%; border: 1px solid rgba(11,18,32,.16); border-radius: 12px; background: rgba(255,255,255,.82); color: var(--ink); padding: 12px 13px;
    }
    textarea { min-height: 120px; resize: vertical; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .form-note { margin: 0; font-size: .76rem; color: #536176 !important; }
    form .btn { border: 0; background: var(--ink); color: var(--white); }

    footer { border-top: 1px solid var(--line); padding: 28px 0 42px; color: var(--muted); font-size: .86rem; }
    .footer-grid { display: flex; justify-content: space-between; align-items: start; gap: 24px; }
    .footer-grid a { color: #d5e2f1; }
    .disclaimer { max-width: 700px; }

    @media (max-width: 920px) {
      .hero-grid, .architecture, .contact-card { grid-template-columns: 1fr; }
      .solutions { grid-template-columns: 1fr; }
      .timeline, .steps { grid-template-columns: 1fr 1fr; }
      nav ul { display: none; position: absolute; top: 74px; left: 20px; right: 20px; padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: #0d1728; flex-direction: column; align-items: stretch; }
      nav ul.open { display: flex; }
      .menu-btn { display: block; }
      .nav-cta { text-align: center; }
    }

    @media (max-width: 620px) {
      .container { width: min(calc(100% - 28px), var(--max)); }
      .hero { padding-top: 62px; }
      section { padding: 68px 0; }
      .timeline, .steps, .trust-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .contact-card { padding: 26px; }
      .solution { padding: 26px; }
      .arch-row { grid-template-columns: 1fr; }
      .arch-arrow { transform: rotate(90deg); }
      .footer-grid { flex-direction: column; }
    }

    /* BIT corporate & product branding */
    .brand-logo {
      display: block;
      width: 235px;
      max-width: 42vw;
      height: auto;
      padding: 4px 8px;
      background: #fff;
      border-radius: 8px;
    }
    .product-logo {
      display: block;
      width: min(430px, 86%);
      height: auto;
      margin: 0 0 22px;
      filter: drop-shadow(0 14px 28px rgba(0,0,0,.18));
    }
    .product-label { color: var(--brand-2); font-weight: 850; letter-spacing: .02em; }
    .solution-name { display: block; color: var(--brand); font-size: .8rem; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 4px; }
    .article-teaser {
      display: grid;
      grid-template-columns: .78fr 1.22fr;
      gap: 34px;
      align-items: center;
      padding: 34px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: linear-gradient(135deg, rgba(86,194,255,.10), rgba(124,224,195,.06));
    }
    .article-teaser h2 { margin-bottom: 12px; }
    .article-teaser p { color: var(--muted); margin-top: 0; }
    .article-tag { display: inline-flex; padding: 7px 11px; border-radius: 999px; background: rgba(86,194,255,.12); color: var(--brand); font-size: .76rem; font-weight: 850; letter-spacing: .07em; text-transform: uppercase; }
    .footer-logo { display:block; width: 245px; max-width: 100%; margin-bottom: 14px; padding: 5px 8px; border-radius: 8px; background:#fff; }

    /* Article */
    .article-hero { padding: 78px 0 48px; }
    .article-hero-inner { max-width: 920px; }
    .article-hero h1 { font-size: clamp(2.45rem, 5.6vw, 4.75rem); max-width: 980px; }
    .article-meta { display:flex; flex-wrap:wrap; gap:10px 18px; color:var(--muted); font-size:.91rem; margin-top:24px; }
    .article-page { padding-top: 34px; }
    .article-layout { display:grid; grid-template-columns: minmax(0,1fr) 280px; gap:48px; align-items:start; }
    .article-content { min-width:0; }
    .article-content h2 { margin: 58px 0 16px; font-size: clamp(1.75rem, 3.2vw, 2.55rem); }
    .article-content h3 { margin: 34px 0 10px; font-size:1.28rem; }
    .article-content p, .article-content li { color:#c6d3e2; }
    .article-content ul, .article-content ol { padding-left: 1.35rem; }
    .article-content li { margin: .48rem 0; }
    .article-content a { color:#dff4ff; text-underline-offset:3px; }
    .article-content strong { color:#fff; }
    .article-intro { font-size:1.18rem; color:#d9e5f2 !important; }
    .article-callout { margin:28px 0; padding:22px 24px; border:1px solid rgba(86,194,255,.32); border-radius:18px; background:rgba(86,194,255,.07); }
    .article-callout p { margin:0; }
    .toc { position:sticky; top:100px; padding:20px; border:1px solid var(--line); border-radius:18px; background:var(--panel); }
    .toc strong { display:block; margin-bottom:10px; }
    .toc a { display:block; padding:7px 0; color:var(--muted); text-decoration:none; font-size:.91rem; }
    .toc a:hover { color:#fff; }
    .source-box { margin-top:54px; padding:24px; border:1px solid var(--line); border-radius:18px; background:var(--panel); }
    .source-box h3 { margin-top:0; }
    .source-box p { margin-bottom:0; }
    .breadcrumb { color:var(--muted); font-size:.88rem; margin-bottom:20px; }
    .breadcrumb a { color:#d6e7f7; }
    .related-cta { margin:56px 0 10px; padding:30px; border-radius:24px; background:linear-gradient(135deg,#dff6ff,#c7f6e8); color:var(--ink); }
    .related-cta h2, .related-cta p { color:var(--ink); }
    .related-cta .btn { background:var(--ink); color:#fff; }
    .product-mini-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:16px; margin:28px 0; }
    .product-mini { padding:22px; border:1px solid var(--line); border-radius:18px; background:var(--panel); }
    .product-mini h3 { margin:6px 0 8px; }
    .product-mini p { margin:0; font-size:.94rem; }
    .logo-lockup { display:flex; align-items:center; gap:18px; flex-wrap:wrap; margin-bottom:28px; }
    .logo-lockup .product-logo { width:min(360px,100%); margin:0; }

    @media (max-width: 920px) {
      .article-teaser, .article-layout { grid-template-columns:1fr; }
      .toc { position:static; order:-1; }
    }
    @media (max-width: 620px) {
      .brand-logo { width: 190px; max-width: 64vw; }
      .product-mini-grid { grid-template-columns:1fr; }
      .article-teaser { padding:24px; }
    }


    /* SEO guide hub */
    .guide-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:18px; }
    .guide-card { display:flex; flex-direction:column; min-height:280px; padding:28px; border:1px solid var(--line); border-radius:var(--radius); background:linear-gradient(180deg,rgba(19,35,58,.96),rgba(13,23,40,.96)); }
    .guide-card.featured-guide { border-color:rgba(86,194,255,.44); background:linear-gradient(145deg,rgba(31,76,107,.72),rgba(13,23,40,.96)); }
    .guide-card h3 { margin:16px 0 10px; font-size:1.45rem; letter-spacing:-.02em; }
    .guide-card p { color:var(--muted); margin:0 0 24px; }
    .guide-card a { margin-top:auto; color:var(--brand); font-weight:850; text-decoration:none; }
    .guide-card a:hover { color:#fff; }
    .article-related { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:14px; margin:28px 0; }
    .article-related a { display:block; padding:18px; border:1px solid var(--line); border-radius:16px; background:var(--panel); text-decoration:none; color:#dff4ff; font-weight:800; }
    .article-related a small { display:block; margin-top:7px; color:var(--muted); font-weight:500; line-height:1.45; }
    .article-source-links { display:flex; flex-wrap:wrap; gap:8px 14px; margin-top:12px; }
    @media (max-width:920px) { .guide-grid { grid-template-columns:1fr; } .article-related { grid-template-columns:1fr; } }