*, *::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; }
    .container--narrow { max-width: 800px; margin: 0 auto; padding: 0 40px; }

    /* ── NAV ── */
    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: 40px; list-style: none; }
    .nav-links a { text-decoration: none; color: var(--gray-700); font-size: 14px; font-weight: 500; letter-spacing: 0.02em; transition: color 0.2s; }
    .nav-links a:hover { color: var(--blue); }
    .nav-cta {
      background: var(--blue); color: var(--white); border: none; padding: 10px 24px;
      font-family: var(--font); font-size: 14px; font-weight: 600; cursor: pointer;
      border-radius: var(--radius); transition: background 0.2s, transform 0.15s;
      text-decoration: none; display: inline-block;
    }
    .nav-cta:hover { background: #4244e0; transform: translateY(-1px); }

    /* ── HERO ── */
    #case-hero {
      padding-top: 72px;
      background: var(--dark);
      position: relative; overflow: hidden;
    }
    .hero-bg-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-inner {
      position: relative; z-index: 1;
      padding: 80px 0 0;
    }
    .breadcrumb {
      display: flex; align-items: center; gap: 8px;
      font-size: 12px; color: rgba(255,255,255,0.35); margin-bottom: 40px;
    }
    .breadcrumb a { color: rgba(255,255,255,0.35); text-decoration: none; transition: color 0.2s; }
    .breadcrumb a:hover { color: rgba(255,255,255,0.7); }
    .breadcrumb span { color: rgba(255,255,255,0.15); }

    .case-meta-row {
      display: flex; align-items: center; gap: 12px; margin-bottom: 24px; flex-wrap: wrap;
    }
    .case-tag {
      font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
      border-radius: 2px; padding: 4px 10px;
    }
    .case-tag--blue { color: #9fa2ff; border: 1px solid rgba(87,90,255,0.3); background: rgba(87,90,255,0.1); }
    .case-tag--yellow { color: var(--yellow); border: 1px solid rgba(255,190,17,0.3); background: rgba(255,190,17,0.08); }
    .case-tag--active {
      color: #4ade80; border: 1px solid rgba(74,222,128,0.3); background: rgba(74,222,128,0.08);
      display: flex; align-items: center; gap: 6px;
    }
    .active-dot { width: 6px; height: 6px; border-radius: 50%; background: #4ade80; }

    .case-h1 {
      font-size: clamp(48px, 6vw, 80px); font-weight: 800;
      color: var(--white); letter-spacing: -0.04em; line-height: 1.0;
      margin-bottom: 24px;
    }
    .case-h1 span { color: var(--blue); }

    .case-subtitle {
      font-size: 20px; color: rgba(255,255,255,0.55); line-height: 1.6;
      max-width: 640px; margin-bottom: 64px; font-weight: 400;
    }

    /* KPI bar */
    .kpi-bar {
      display: grid; grid-template-columns: repeat(4, 1fr);
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    .kpi-item {
      padding: 40px 40px;
      border-right: 1px solid rgba(255,255,255,0.08);
    }
    .kpi-item:last-child { border-right: none; }
    .kpi-num {
      font-size: 48px; font-weight: 800; color: var(--white);
      line-height: 1; letter-spacing: -0.04em; margin-bottom: 6px;
    }
    .kpi-num em { color: var(--blue); font-style: normal; }
    .kpi-num.yellow em { color: var(--yellow); }
    .kpi-label { font-size: 13px; color: rgba(255,255,255,0.4); line-height: 1.4; }

    /* ── CONTENT LAYOUT ── */
    .case-body { padding: 80px 0; }
    .case-body-inner {
      display: grid; grid-template-columns: 1fr 280px; gap: 80px; align-items: start;
    }

    /* Sidebar */
    .case-sidebar { position: sticky; top: 96px; }
    .sidebar-block {
      border: 1px solid var(--gray-200); border-radius: var(--radius);
      overflow: hidden; margin-bottom: 24px;
    }
    .sidebar-title {
      font-size: 10px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
      color: var(--gray-500); padding: 14px 20px; background: var(--gray-100);
      border-bottom: 1px solid var(--gray-200);
    }
    .sidebar-list { padding: 0; }
    .sidebar-item {
      display: flex; justify-content: space-between; align-items: center;
      padding: 12px 20px; border-bottom: 1px solid var(--gray-200); gap: 16px;
    }
    .sidebar-item:last-child { border-bottom: none; }
    .sidebar-key { font-size: 12px; color: var(--gray-500); font-weight: 400; }
    .sidebar-val { font-size: 13px; color: var(--dark); font-weight: 600; text-align: right; }
    .sidebar-toc { padding: 8px 0; }
    .toc-link {
      display: flex; align-items: center; gap: 10px;
      padding: 8px 20px; font-size: 13px; color: var(--gray-700);
      text-decoration: none; transition: color 0.2s; cursor: pointer;
    }
    .toc-link:hover, .toc-link.active { color: var(--blue); }
    .toc-link::before {
      content: ''; width: 4px; height: 4px; border-radius: 50%;
      background: var(--gray-200); flex-shrink: 0; transition: background 0.2s;
    }
    .toc-link.active::before { background: var(--blue); }

    /* Main content */
    .case-main {}
    .case-section { margin-bottom: 72px; }
    .case-section:last-child { margin-bottom: 0; }

    .section-anchor { display: block; position: relative; top: -96px; visibility: hidden; }
    .cs-label {
      font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
      color: var(--blue); margin-bottom: 12px;
    }
    .cs-h2 {
      font-size: clamp(24px, 2.5vw, 36px); font-weight: 800;
      letter-spacing: -0.025em; color: var(--dark); line-height: 1.15; margin-bottom: 20px;
    }
    .cs-p {
      font-size: 16px; color: var(--gray-700); line-height: 1.8; margin-bottom: 16px;
    }
    .cs-p:last-child { margin-bottom: 0; }

    /* Divider */
    .cs-divider { border: none; border-top: 1px solid var(--gray-200); margin: 56px 0; }

    /* Challenge / solution block */
    .cs-two-col {
      display: grid; grid-template-columns: 1fr 1fr; gap: 2px;
      background: var(--gray-200); border: 1px solid var(--gray-200);
      border-radius: var(--radius); overflow: hidden; margin-top: 32px;
    }
    .cs-col { background: var(--white); padding: 32px; }
    .cs-col-label {
      font-size: 10px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
      color: var(--gray-500); margin-bottom: 12px;
    }
    .cs-col h4 { font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 12px; letter-spacing: -0.01em; }
    .cs-col p { font-size: 14px; color: var(--gray-700); line-height: 1.7; }

    /* Work stages */
    .stages-list { display: flex; flex-direction: column; gap: 0; margin-top: 32px; border: 1px solid var(--gray-200); border-radius: var(--radius); overflow: hidden; }
    .stage-item {
      display: grid; grid-template-columns: 56px 1fr;
      border-bottom: 1px solid var(--gray-200); transition: background 0.15s;
    }
    .stage-item:last-child { border-bottom: none; }
    .stage-item:hover { background: var(--gray-100); }
    .stage-num {
      display: flex; align-items: flex-start; justify-content: center;
      padding: 24px 0; font-size: 13px; font-weight: 700; color: var(--blue);
      border-right: 1px solid var(--gray-200); padding-top: 26px;
      font-variant-numeric: tabular-nums;
    }
    .stage-content { padding: 22px 24px; }
    .stage-content h4 { font-size: 15px; font-weight: 700; color: var(--dark); margin-bottom: 6px; letter-spacing: -0.01em; }
    .stage-content p { font-size: 13px; color: var(--gray-700); line-height: 1.65; }
    .stage-duration {
      display: inline-flex; align-items: center; gap: 4px;
      font-size: 11px; color: var(--gray-500); margin-top: 8px;
      font-weight: 500;
    }

    /* Results metrics */
    .results-grid {
      display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 32px;
    }
    .result-card {
      border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 28px 24px;
      transition: border-color 0.2s;
    }
    .result-card:hover { border-color: var(--blue); }
    .result-card:first-child {
      grid-column: 1 / -1; background: var(--blue); border-color: var(--blue);
    }
    .result-card:first-child .result-num { color: var(--white); }
    .result-card:first-child .result-label { color: rgba(255,255,255,0.65); }
    .result-card:first-child .result-delta { background: rgba(255,255,255,0.15); color: var(--white); }
    .result-num {
      font-size: 44px; font-weight: 800; color: var(--dark);
      line-height: 1; letter-spacing: -0.04em; margin-bottom: 6px;
    }
    .result-num span { color: var(--yellow); }
    .result-label { font-size: 13px; color: var(--gray-500); line-height: 1.4; margin-bottom: 8px; }
    .result-delta {
      display: inline-flex; align-items: center; gap: 4px;
      font-size: 11px; font-weight: 600; background: rgba(87,90,255,0.08);
      color: var(--blue); padding: 3px 8px; border-radius: 2px;
    }

    /* Quote */
    .cs-quote {
      border-left: 3px solid var(--blue); padding: 24px 32px;
      background: rgba(87,90,255,0.03); border-radius: 0 var(--radius) var(--radius) 0;
      margin: 32px 0;
    }
    .cs-quote p {
      font-size: 18px; color: var(--dark); line-height: 1.7;
      font-weight: 500; letter-spacing: -0.01em; font-style: italic;
    }
    .cs-quote cite {
      display: block; margin-top: 12px; font-size: 13px;
      color: var(--gray-500); font-style: normal; font-weight: 500;
    }

    /* Tools used */
    .tools-grid {
      display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px;
    }
    .tool-chip {
      font-size: 12px; font-weight: 500; color: var(--gray-700);
      border: 1px solid var(--gray-200); border-radius: 2px;
      padding: 6px 12px; background: var(--gray-100);
      transition: border-color 0.15s, color 0.15s;
    }
    .tool-chip:hover { border-color: var(--blue); color: var(--blue); }

    /* Chart placeholder */
    .chart-area {
      border: 1px solid var(--gray-200); border-radius: var(--radius);
      padding: 32px; background: var(--gray-100); margin-top: 32px;
      position: relative; overflow: hidden;
    }
    .chart-title { font-size: 12px; font-weight: 600; color: var(--gray-500); margin-bottom: 24px; text-transform: uppercase; letter-spacing: 0.08em; }
    .chart-bars {
      display: flex; align-items: flex-end; gap: 8px; height: 120px;
    }
    .chart-col { display: flex; flex-direction: column; align-items: center; flex: 1; gap: 6px; }
    .chart-bar {
      width: 100%; border-radius: 2px 2px 0 0; transition: height 0.6s ease;
    }
    .chart-bar--before { background: var(--gray-200); }
    .chart-bar--after { background: var(--blue); }
    .chart-month { font-size: 10px; color: var(--gray-500); }
    .chart-legend {
      display: flex; gap: 20px; margin-top: 16px; padding-top: 16px;
      border-top: 1px solid var(--gray-200);
    }
    .chart-legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--gray-700); }
    .chart-legend-dot { width: 8px; height: 8px; border-radius: 2px; }

    /* ── NEXT CASE ── */
    #next-case {
      border-top: 1px solid var(--gray-200); padding: 64px 0;
      background: var(--gray-100);
    }
    .next-inner {
      display: flex; align-items: center; justify-content: space-between; gap: 40px;
    }
    .next-label { font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--gray-500); margin-bottom: 8px; }
    .next-title { font-size: 28px; font-weight: 800; color: var(--dark); letter-spacing: -0.02em; }
    .next-sub { font-size: 14px; color: var(--gray-500); margin-top: 4px; }
    .btn-primary {
      background: var(--blue); color: var(--white); border: none; padding: 14px 28px;
      font-family: var(--font); font-size: 14px; font-weight: 600; cursor: pointer;
      border-radius: var(--radius); transition: background 0.2s, transform 0.15s;
      text-decoration: none; display: inline-flex; align-items: center; gap: 8px; white-space: nowrap;
    }
    .btn-primary:hover { background: #4244e0; transform: translateY(-1px); }
    .btn-ghost {
      color: var(--gray-700); border: 1px solid var(--gray-200); padding: 13px 28px;
      font-family: var(--font); font-size: 14px; font-weight: 500; cursor: pointer;
      border-radius: var(--radius); background: transparent; transition: border-color 0.2s, color 0.2s;
      text-decoration: none; display: inline-block; white-space: nowrap;
    }
    .btn-ghost:hover { border-color: var(--blue); color: var(--blue); }

    /* ── FOOTER ── */
    footer { background: var(--dark); border-top: 1px solid rgba(255,255,255,0.06); padding: 48px 0; }
    .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); }

    /* ── REVEAL ── */
    .reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }