/* Diversifying AI Ownership — same system as hfh.pw, serif for long-form reading. */
:root {
  --bg: #ffffff;
  --ink: #0f1115;
  --ink-2: #2e333c;
  --muted: #5d6470;
  --line: #e6e8ec;
  --wash: #f4f5f7;
  --accent: #1f3fe0;
  --accent-wash: rgba(31, 63, 224, .08);
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Source Serif 4", "Source Serif Pro", ui-serif, Georgia, serif;
  --sidebar-w: 284px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d11;
    --ink: #e9ebef;
    --ink-2: #c5cad3;
    --muted: #8b93a1;
    --line: #1f242c;
    --wash: #13161c;
    --accent: #8ea2ff;
    --accent-wash: rgba(142, 162, 255, .12);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 24px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
a {
  color: inherit; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .2em;
  text-decoration-color: color-mix(in srgb, var(--accent) 50%, transparent);
}
a:hover { color: var(--accent); text-decoration-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

#progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: var(--accent); z-index: 40; }

/* ------------------------------------------------ sidebar */
.sidebar {
  position: fixed; top: 0; bottom: 0; left: 0; width: var(--sidebar-w); z-index: 30;
  padding: 30px 24px 28px; overflow-y: auto; background: var(--bg); border-right: 1px solid var(--line);
}
.brand {
  display: flex; gap: 10px; align-items: flex-start;
  font-weight: 700; font-size: 17px; line-height: 1.25; letter-spacing: -.015em;
  text-decoration: none; margin-bottom: 30px;
}
.brand:hover { color: var(--ink); }
.mark { width: 12px; height: 12px; background: var(--accent); border-radius: 2px; flex-shrink: 0; margin-top: 5px; }
.toc-label {
  font-size: 11.5px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 8px 10px;
}
.toc { display: flex; flex-direction: column; gap: 1px; }
.toc a {
  display: block; padding: 5px 10px; border-left: 2px solid transparent; border-radius: 0 6px 6px 0;
  font-size: 13.5px; line-height: 1.4; color: var(--muted); text-decoration: none;
}
.toc a.toc-2 { padding-left: 22px; font-size: 13px; }
.toc a:hover { color: var(--ink); background: var(--wash); }
.toc a.active { color: var(--ink); border-left-color: var(--accent); background: var(--wash); }
.sidebar-links {
  display: flex; flex-direction: column; gap: 10px;
  margin-top: 26px; padding-top: 20px; border-top: 1px solid var(--line);
}
.sidebar-links a { font-size: 13.5px; color: var(--muted); text-decoration: none; }
.sidebar-links a:hover { color: var(--accent); }

/* ------------------------------------------------ page */
.page { margin-left: var(--sidebar-w); padding: 0 56px; }
.page > * { max-width: 740px; margin-left: auto; margin-right: auto; }

.hero { padding: 104px 0 56px; border-bottom: 1px solid var(--line); }
.hero.compact { max-width: 740px; margin: 0 auto; padding: 88px 24px 40px; }
.kicker {
  font-size: 12.5px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 18px;
}
.kicker a { text-decoration: none; }
.site-title {
  font-size: clamp(44px, 6.4vw, 78px); line-height: .98; letter-spacing: -.045em;
  font-weight: 700; margin: 0 0 22px; text-wrap: balance;
}
.authors { font-size: 18px; font-weight: 500; color: var(--muted); margin: 0 0 18px; }
.cited, .standfirst { font-size: 17px; color: var(--ink-2); margin: 0 0 30px; max-width: 36em; }
.standfirst { font-family: var(--serif); font-size: 20px; line-height: 1.6; }
.disclosure {
  font-size: 14.5px; line-height: 1.5; color: var(--ink-2); background: var(--wash);
  border-left: 3px solid var(--accent); border-radius: 0 6px 6px 0; padding: 10px 14px; margin: 0 0 24px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
  font: 500 14.5px/1 var(--sans); padding: 10px 14px; border-radius: 7px;
  color: var(--ink); background: var(--bg); border: 1px solid var(--line); text-decoration: none;
}
.btn:hover { color: var(--ink); border-color: var(--ink); }
.btn.primary { color: var(--bg); background: var(--ink); border-color: var(--ink); }
.btn.primary:hover { color: #fff; background: var(--accent); border-color: var(--accent); }

/* ------------------------------------------------ essay */
.essay { font-family: var(--serif); font-size: 19.5px; line-height: 1.72; padding: 8px 0 0; overflow-wrap: break-word; }
.essay.narrow { max-width: 740px; margin: 0 auto; padding: 8px 24px 0; }
.essay p { margin: 0 0 1.1em; }
.essay h1, .essay h2, .essay h3, .essay h4 { font-family: var(--sans); color: var(--ink); text-wrap: balance; }
.essay h1 {
  font-size: 32px; line-height: 1.15; letter-spacing: -.03em; font-weight: 700;
  margin: 2.2em 0 .7em; padding-top: 1.1em; border-top: 1px solid var(--line);
}
.essay > h1:first-child { margin-top: 1.4em; border-top: 0; padding-top: 0; }
.essay h2 { font-size: 24px; line-height: 1.25; letter-spacing: -.02em; font-weight: 700; margin: 1.9em 0 .55em; }
.essay h3 { font-size: 20px; line-height: 1.3; letter-spacing: -.015em; font-weight: 650; margin: 1.7em 0 .45em; }
.essay h4 { font-size: 18px; font-weight: 650; margin: 1.5em 0 .4em; }
.essay strong { font-weight: 650; }
.essay ul, .essay ol { padding-left: 1.35em; margin: 0 0 1.1em; }
.essay li { margin: .35em 0; }
.essay li > h1, .essay li > h2, .essay li > h3 { display: inline; border: 0; padding: 0; }
.essay .l1 { margin-left: 1.5em; } .essay .l2 { margin-left: 3em; } .essay .l3 { margin-left: 4.5em; }
.essay img { max-width: 100%; height: auto; border-radius: 4px; }
.essay table {
  display: block; overflow-x: auto; border-collapse: collapse; margin: 1.6em 0;
  font-family: var(--sans); font-size: 15px; line-height: 1.5; max-width: 100%;
}
.essay td { border: 1px solid var(--line); padding: 8px 11px; vertical-align: top; }
.essay td p { margin: 0; }
.essay sup { font-family: var(--sans); font-size: .62em; line-height: 0; }
.essay sup a { color: var(--accent); text-decoration: none; padding: 0 1px; }
.essay hr { border: 0; border-top: 1px solid var(--line); margin: 2.6em 0; }
.essay :target { background: var(--accent-wash); border-radius: 3px; }
.essay .cta { margin-top: 2em; }

.continue {
  margin: 64px 0 8px; padding: 20px 22px; border: 1px solid var(--line); border-radius: 10px;
  font-family: var(--sans);
}
.continue:hover { border-color: var(--accent); }
.continue-label {
  font-size: 11.5px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 6px;
}
.continue-link { display: block; text-decoration: none; }
.continue-title { display: block; font-size: 21px; font-weight: 650; letter-spacing: -.015em; line-height: 1.3; }
.continue-note { display: block; font-size: 14px; color: var(--muted); margin-top: 4px; }

.footnotes {
  margin-top: 64px; padding-top: 8px; border-top: 1px solid var(--line);
  font-family: var(--sans); font-size: 14.5px; line-height: 1.6; color: var(--ink-2);
}
.footnotes h2 {
  font-size: 12px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); margin: 16px 0 12px; border: 0;
}
.footnotes p { margin: 0 0 .5em; }
.footnotes div { max-width: 740px; }

.page-footer {
  margin-top: 80px; padding: 24px 0 64px; border-top: 1px solid var(--line);
  font-size: 14px; color: var(--muted);
}
.companion .page-footer { max-width: 740px; margin: 80px auto 0; padding: 24px 24px 64px; }
.page-footer p { margin: 0 0 6px; }

/* ------------------------------------------------ small screens */
#menu-btn {
  display: none; position: fixed; right: 16px; bottom: 16px; z-index: 35;
  width: 50px; height: 50px; border-radius: 50%; border: 1px solid var(--line);
  background: var(--bg); color: var(--ink); font-size: 20px; cursor: pointer;
  box-shadow: 0 4px 18px rgba(0, 0, 0, .14);
}
@media (max-width: 1080px) {
  .sidebar { transform: translateX(-102%); transition: transform .2s ease; width: 300px; box-shadow: 8px 0 32px rgba(0, 0, 0, .12); }
  .sidebar.open { transform: none; }
  .page { margin-left: 0; padding: 0 20px; }
  #menu-btn { display: block; }
}
@media (max-width: 600px) {
  .hero { padding-top: 64px; }
  .essay { font-size: 18px; }
  .essay h1 { font-size: 27px; }
}