:root {
    --paper: #2a2a2d;
    --paper-light: #313135;
    --paper-dark: #232326;
    --paper-surface: #33333a;
    --ink: #e8e6e1;
    --ink-light: #b8b6b0;
    --ink-muted: #7d7b76;
    --rule: #434347;
    --rule-light: #3b3b3f;
    --accent: #5a9ae0;
    --accent-dark: #3d7ec7;
    --accent-light: #7cb3f0;
    --accent-bg: rgba(90,154,224,0.08);
    --danger: #d45555;
    --danger-bg: rgba(212,85,85,0.07);
    --green: #5cb87a;
    --green-bg: rgba(92,184,122,0.08);
    --font-display: 'DM Serif Display', Georgia, serif;
    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
    --font-sans: 'DM Sans', system-ui, sans-serif;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  html {
    font-size: 16px;
    scroll-behavior: smooth;
  }

  body {
    font-family: var(--font-sans);
    background: var(--paper);
    color: var(--ink);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    position: relative;
    overflow-x: hidden;
  }

  /* Paper grain overlay */
  body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 9999;
    mix-blend-mode: overlay;
  }

  /* ── NAVIGATION ── */
  nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    transition: box-shadow 0.3s ease;
  }

  nav.scrolled {
    box-shadow: 0 1px 12px rgba(0,0,0,0.3);
  }

  .nav-inner {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
  }

  .nav-left {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
  }

  .nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 10px;
    font-family: 'DM Mono', var(--font-mono);
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 0.08em;
    color: var(--ink);
  }
  .nav-logo img {
    height: 22px;
    width: auto;
  }

  .nav-mark {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
  }

  .nav-links {
    display: flex;
    align-items: center;
    gap: 1.75rem;
  }

  .nav-links a {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--ink-light);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color 0.2s;
  }

  .nav-links a:hover {
    color: var(--ink);
  }

  .nav-cta {
    font-family: var(--font-mono) !important;
    font-size: 0.72rem !important;
    font-weight: 500 !important;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--paper) !important;
    background: var(--accent);
    padding: 0.45rem 1.1rem;
    border-radius: 2px;
    transition: background 0.2s, transform 0.15s;
  }

  .nav-cta:hover {
    background: var(--accent-light) !important;
    color: var(--paper-dark) !important;
    transform: translateY(-1px);
  }

  /* Mobile nav */
  .nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
  }

  .nav-toggle span {
    display: block;
    width: 20px;
    height: 1.5px;
    background: var(--ink);
    margin: 5px 0;
    transition: transform 0.3s, opacity 0.3s;
  }

  /* ── RUNNING HEADER ── */
  .running-header {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    padding: 0.4rem 2rem;
    border-bottom: 1px solid var(--rule-light);
    max-width: 1320px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
  }

  /* ── MAIN CONTENT ── */
  main {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 2rem;
    padding-top: 56px;
  }

  /* ── HERO ── */
  .hero {
    padding: 5rem 0 3.5rem;
    border-bottom: 2px solid var(--rule);
    position: relative;
  }

  .hero-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 3rem;
    align-items: start;
  }

  .hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2.8rem, 5vw, 4.8rem);
    font-weight: 400;
    line-height: 1.12;
    letter-spacing: -0.01em;
    color: var(--ink);
    max-width: 680px;
  }

  .hero h1 em {
    font-style: italic;
    color: var(--accent);
  }

  .hero-sub {
    font-family: var(--font-sans);
    font-size: 1.15rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--ink-light);
    margin-top: 1.5rem;
    max-width: 580px;
  }

  .hero-sub strong {
    color: var(--ink);
  }

  .hero-cta-row {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-top: 2rem;
  }

  .btn-primary {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--paper-dark);
    background: var(--accent);
    padding: 0.8rem 1.75rem;
    border: none;
    border-radius: 2px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: background 0.2s, transform 0.15s;
  }

  .btn-primary:hover {
    background: var(--accent-light);
    transform: translateY(-1px);
  }

  .btn-secondary {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.06em;
    color: var(--ink-light);
    text-decoration: none;
    border-bottom: 1px solid var(--rule);
    padding-bottom: 2px;
    transition: color 0.2s, border-color 0.2s;
  }

  .btn-secondary:hover {
    color: var(--accent);
    border-color: var(--accent);
  }

  /* Hero sidebar annotation */
  .hero-annotation {
    background: #3d3d44;
    border-left: 3px solid var(--accent);
    padding: 1.5rem;
    position: relative;
    border-radius: 2px;
  }

  .hero-annotation::before {
    content: 'FIG. 1';
    position: absolute;
    top: -0.6rem;
    left: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.55rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    background: #3d3d44;
    padding: 0 0.3rem;
  }

  .annotation-title {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-muted);
    margin-bottom: 1rem;
  }

  .annotation-diagram {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 2;
    color: var(--ink-light);
  }

  .annotation-diagram .redline {
    color: var(--accent);
    font-weight: 700;
  }

  .annotation-diagram .arrow {
    color: var(--ink-muted);
  }

  /* ── STATS BAND ── */
  .stats-band {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    border-bottom: 2px solid var(--rule);
  }

  .stat-cell {
    padding: 2rem 1.5rem;
    border-right: 1px solid var(--rule);
    position: relative;
  }

  .stat-cell:last-child {
    border-right: none;
  }

  .stat-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--ink-light);
    margin-bottom: 0.5rem;
  }

  .stat-number {
    font-family: var(--font-mono);
    font-size: clamp(2.4rem, 4vw, 3.8rem);
    font-weight: 300;
    line-height: 1;
    letter-spacing: -0.02em;
  }

  .stat-number.accent { color: var(--accent-light); }
  .stat-number.ink { color: #f2f0ec; }

  .stat-desc {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--ink-light);
    margin-top: 0.5rem;
    line-height: 1.6;
  }

  .stat-source {
    font-family: var(--font-mono);
    font-size: 0.55rem;
    color: var(--ink-muted);
    margin-top: 0.75rem;
    letter-spacing: 0.05em;
  }

  /* ── SECTION HEADERS ── */
  .section {
    padding: 4rem 0;
    border-bottom: 1px solid var(--rule);
    position: relative;
  }

  .section-number {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--ink-muted);
    margin-bottom: 0.75rem;
  }

  .section h2 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    font-weight: 400;
    line-height: 1.08;
    letter-spacing: -0.02em;
    max-width: 700px;
  }

  .section h2 .accent {
    color: var(--accent);
  }

  .section-lead {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 300;
    color: var(--ink-light);
    margin-top: 1rem;
    max-width: 620px;
    line-height: 1.75;
  }

  /* ── THE GAP SECTION ── */
  .gap-content {
    margin-top: 2.5rem;
  }

  .gap-text {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--ink-light);
    max-width: 640px;
    margin-top: 2rem;
  }

  .gap-text strong {
    color: var(--ink);
  }

  .gap-text .redmark {
    color: var(--accent);
    font-weight: 700;
    text-decoration: underline;
    text-decoration-color: var(--accent);
    text-underline-offset: 3px;
  }

  /* ── HOW IT WORKS ── */
  .process-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0;
    margin-top: 2.5rem;
    border: 1px solid var(--rule);
    background: #3d3d44;
  }

  .process-step {
    padding: 2rem 1.75rem;
    border-right: 1px solid var(--rule);
    position: relative;
  }

  .process-step:last-child {
    border-right: none;
  }

  .process-step-num {
    font-family: var(--font-mono);
    font-size: 1.8rem;
    font-weight: 300;
    color: var(--ink-muted);
    line-height: 1;
    margin-bottom: 1rem;
  }

  .process-step h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 400;
    margin-bottom: 0.75rem;
    color: #f2f0ec;
  }

  .process-step p {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    line-height: 1.75;
    color: var(--ink-light);
  }

  /* ── SPEED COMPARISON ── */
  .speed-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    margin-top: 2.5rem;
    border: 1px solid var(--rule);
  }

  .speed-col {
    padding: 2rem;
  }

  .speed-col.status-quo {
    background: #3a3438;
    border-right: 1px solid var(--rule);
  }

  .speed-col.stratum {
    background: #34393d;
  }

  .speed-col-header {
    font-family: var(--font-sans);
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 1.5rem;
  }

  .speed-col.status-quo .speed-col-header { color: var(--danger); }
  .speed-col.stratum .speed-col-header { color: var(--accent); }

  .speed-stat {
    margin-bottom: 1.5rem;
  }

  .speed-stat-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 300;
    line-height: 1;
  }

  .speed-col.status-quo .speed-stat-number { color: #e86565; }
  .speed-col.stratum .speed-stat-number { color: var(--accent-light); }

  .speed-stat-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--ink-muted);
    margin-top: 0.25rem;
  }

  /* ── BH CALLOUT ── */
  .bh-callout {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 0;
    margin-top: 2.5rem;
    border: 1px solid var(--rule);
    background: #3d3d44;
  }

  .bh-text {
    padding: 2.5rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    line-height: 1.75;
    color: var(--ink-light);
  }

  .bh-text strong { color: var(--ink); }

  .bh-stats {
    background: #343438;
    color: var(--ink);
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-left: 1px solid var(--rule);
  }

  .bh-stat-item {
    margin-bottom: 1.5rem;
  }

  .bh-stat-item:last-child { margin-bottom: 0; }

  .bh-stat-num {
    font-family: var(--font-mono);
    font-size: 1.8rem;
    font-weight: 300;
    color: var(--accent-light);
    line-height: 1;
  }

  .bh-stat-desc {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--ink-light);
    margin-top: 0.3rem;
  }

  /* ── ASSESSMENT CTA ── */
  .assessment-section {
    text-align: left;
    padding: 4rem 0;
    border-bottom: 2px solid var(--rule);
  }

  .assessment-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 2rem;
    align-items: center;
  }

  .assessment-details {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    line-height: 1.75;
    color: var(--ink-light);
  }

  .assessment-terms {
    display: flex;
    gap: 2rem;
    margin-top: 1.5rem;
  }

  .assessment-term {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--ink);
  }

  .assessment-term .check {
    color: var(--green);
    font-size: 1rem;
  }

  .assessment-cta-box {
    background: #3d3d44;
    padding: 2.5rem;
    border-radius: 2px;
    border: 1px solid var(--rule);
  }

  .assessment-cta-box h3 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 1rem;
  }

  .assessment-cta-box p {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--ink-muted);
    line-height: 1.75;
    margin-bottom: 1.5rem;
  }

  .btn-primary-light {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--paper-dark);
    background: var(--accent);
    padding: 0.8rem 1.75rem;
    border: none;
    border-radius: 2px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: background 0.2s, color 0.2s, transform 0.15s;
  }

  .btn-primary-light:hover {
    background: var(--accent-light);
    color: var(--paper-dark);
    transform: translateY(-1px);
  }

  /* ── FAQ ── */
  .faq-list {
    margin-top: 2.5rem;
  }

  .faq-item {
    border-bottom: 1px solid var(--rule);
    padding: 1.25rem 0;
  }

  .faq-question {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 400;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--ink);
    transition: color 0.2s;
    user-select: none;
  }

  .faq-question:hover {
    color: var(--accent);
  }

  .faq-toggle {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    color: var(--ink-muted);
    transition: transform 0.3s;
    flex-shrink: 0;
    margin-left: 1rem;
  }

  .faq-item.open .faq-toggle {
    transform: rotate(45deg);
  }

  .faq-answer {
    font-family: var(--font-sans);
    font-size: 0.88rem;
    line-height: 1.75;
    color: var(--ink-light);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding-top: 0;
  }

  .faq-item.open .faq-answer {
    max-height: 300px;
    padding-top: 1rem;
  }

  /* ── FOOTER ── */
  footer {
    border-top: 2px solid var(--rule);
    padding: 3rem 0;
    max-width: 1320px;
    margin: 0 auto;
    padding-left: 2rem;
    padding-right: 2rem;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
  }

  .footer-brand {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
  }

  .footer-tagline {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--ink-muted);
    line-height: 1.7;
    max-width: 280px;
  }

  .footer-col h4 {
    font-family: var(--font-sans);
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--ink-muted);
    margin-bottom: 0.75rem;
  }

  .footer-col a {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--ink-light);
    text-decoration: none;
    padding: 0.2rem 0;
    transition: color 0.2s;
  }

  .footer-col a:hover {
    color: var(--accent);
  }

  .footer-bottom {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--rule-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .footer-copy {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--ink-muted);
    letter-spacing: 0.05em;
  }

  .footer-legal a {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--ink-muted);
    text-decoration: none;
    margin-left: 1.5rem;
  }

  /* ── SOURCES ── */
  .sources {
    padding: 2rem 0;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--ink-muted);
    line-height: 1.8;
  }

  .sources-title {
    font-family: var(--font-sans);
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 0.5rem;
  }

  /* ── REDLINE ANNOTATIONS ── */
  .redline {
    position: relative;
    display: inline;
  }

  .redline::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 2px;
    background: var(--accent);
  }

  .margin-note {
    position: absolute;
    right: -200px;
    width: 180px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent);
    line-height: 1.5;
    padding-left: 1rem;
    border-left: 2px solid var(--accent);
  }

  /* ── TICKER ── */
  .ticker-wrap {
    overflow: hidden;
    border-bottom: 1px solid var(--rule);
    padding: 0.5rem 0;
    background: var(--paper-dark);
  }

  .ticker {
    display: flex;
    animation: ticker-scroll 40s linear infinite;
    white-space: nowrap;
  }

  .ticker-item {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--ink-muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0 2rem;
    flex-shrink: 0;
  }

  .ticker-item .sep {
    color: var(--accent);
    margin: 0 0.5rem;
  }

  @keyframes ticker-scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
  }

  /* ── PAGE NUMBER ── */
  .page-marker {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    font-family: var(--font-mono);
    font-size: 0.55rem;
    color: var(--rule);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    z-index: 50;
    writing-mode: vertical-rl;
    opacity: 0.5;
  }

  /* ── SCROLL ANIMATIONS ── */
  .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }

  .reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }

  .stat-number[data-count] {
    transition: color 0.3s;
  }

  /* ── RESPONSIVE ── */
  @media (max-width: 960px) {
    .hero-grid {
      grid-template-columns: 1fr;
    }

    .hero-annotation {
      display: none;
    }

    .hero h1 {
      font-size: 2.2rem;
    }

    .stats-band {
      grid-template-columns: 1fr;
    }

    .stat-cell {
      border-right: none;
      border-bottom: 1px solid var(--rule);
    }

    .process-grid {
      grid-template-columns: 1fr;
    }

    .process-step {
      border-right: none;
      border-bottom: 1px solid var(--rule);
    }

    .process-step:last-child { border-bottom: none; }

    .speed-grid {
      grid-template-columns: 1fr;
    }

    .speed-col.status-quo {
      border-right: none;
      border-bottom: 1px solid var(--rule);
    }

    .bh-callout {
      grid-template-columns: 1fr;
    }

    .assessment-grid {
      grid-template-columns: 1fr;
    }

    .assessment-terms {
      flex-direction: column;
      gap: 0.75rem;
    }

    .footer-grid {
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
    }

    .nav-links {
      display: none;
    }

    .nav-toggle {
      display: block;
    }

    .margin-note {
      display: none;
    }
  }

  @media (max-width: 600px) {
    .hero h1 { font-size: 1.8rem; }
    .stat-number { font-size: 2rem; }
    .section h2 { font-size: 1.4rem; }
    main { padding-left: 1.25rem; padding-right: 1.25rem; }
    .footer-grid { grid-template-columns: 1fr; }
  }