/* Shared chrome — masthead, page-header, footnotes, footer, common components. */

.page {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

a.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: var(--space-2) var(--space-3);
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em;
  text-transform: uppercase; text-decoration: none;
  z-index: 100;
}
a.skip:focus { left: var(--space-3); top: var(--space-3); }

/* ─── MASTHEAD ───
   Sticky on scroll. Single horizontal row that collapses to a hamburger
   below 720px. Backdrop-blur keeps the editorial paper-warm tone visible
   over the body content rather than slamming a flat white bar on top. */

.masthead {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(246, 245, 242, 0.92);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--ink-20);
  padding: 10px 0;
  margin: 0 calc(var(--space-4) * -1);
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.masthead-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-60);
  max-width: var(--page-max);
  margin: 0 auto;
  min-height: 44px;
}

.masthead-wordmark {
  font-family: var(--body);
  font-style: italic;
  font-size: 16px;
  letter-spacing: -0.005em;
  text-transform: none;
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
  flex-shrink: 0;
  padding: 10px 0;
  margin: -10px 0;
}
.masthead-wordmark:hover { color: var(--signal); }

.masthead-nav {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}
.masthead-nav a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.15s;
  padding: 12px 8px;
  margin: -12px 0;
  position: relative;
}
.masthead-nav a::after {
  content: '';
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 6px;
  height: 2px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.18s ease-out;
}
.masthead-nav a:hover { color: var(--signal); }
.masthead-nav a:hover::after { transform: scaleX(1); }
.masthead-nav a.active { color: var(--signal); }
.masthead-nav a.active::after { transform: scaleX(1); }

/* Mobile-only toggle button. Mono label rendered via ::before so the
   markup stays clean; aria-expanded drives the open/close state. */
.masthead-toggle {
  display: none;
  background: transparent;
  border: 0;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  padding: 12px 4px;
  margin: -12px 0;
  user-select: none;
  min-height: 44px;
  align-items: center;
}
.masthead-toggle::before { content: 'Menu'; }
.masthead-toggle[aria-expanded="true"]::before { content: 'Close'; }

.lang-switch {
  display: flex;
  gap: 2px;
  align-items: center;
  flex-shrink: 0;
  font-size: 11px;
  letter-spacing: 0.08em;
}
.lang-switch a {
  color: var(--ink-40);
  text-decoration: none;
  transition: color 0.15s;
  padding: 12px 6px;
  margin: -12px 0;
  min-width: 28px;
  text-align: center;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.lang-switch a:hover { color: var(--ink-80); }
.lang-switch a.active { color: var(--ink); }
.lang-switch a[aria-disabled="true"] { color: var(--ink-20); cursor: not-allowed; }
.lang-switch a[aria-disabled="true"]:hover { color: var(--ink-20); }
.lang-switch span { color: var(--ink-20); padding: 0 2px; }

/* ─── PAGE HEADER ─── */

.page-header {
  padding: var(--space-6) 0 var(--space-5);
  border-bottom: 1px solid var(--ink-10);
}

.page-header-rule {
  height: 1px;
  background: var(--ink);
  width: 64px;
  margin-bottom: var(--space-3);
}

.page-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-60);
  margin-bottom: var(--space-3);
}
.page-eyebrow .ref { color: var(--signal); font-weight: 500; }

.page-title {
  font-family: var(--body);
  font-weight: 500;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.022em;
  color: var(--ink);
  text-wrap: balance;
  max-width: 18ch;
}

.page-lede {
  font-family: var(--body);
  font-size: clamp(19px, 1.8vw, 22px);
  line-height: 1.5;
  color: var(--ink-80);
  margin-top: var(--space-4);
  max-width: 64ch;
  text-wrap: pretty;
}

/* ─── SECTION HEADING SCALE ───
   Modular type system for in-page H2s. Three sizes, all serif body font,
   all weight 500. Replaces ad-hoc inline styles across talks/about/press. */

.section-title {
  font-family: var(--body);
  font-weight: 500;
  font-size: clamp(28px, 3.2vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.018em;
  color: var(--ink);
  margin-bottom: var(--space-3);
  text-wrap: balance;
  max-width: 24ch;
}
.section-title-md {
  font-family: var(--body);
  font-weight: 500;
  font-size: clamp(26px, 2.8vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.014em;
  color: var(--ink);
  margin-bottom: var(--space-3);
  text-wrap: balance;
  max-width: 26ch;
}
.section-title-sm {
  font-family: var(--body);
  font-weight: 500;
  font-size: clamp(22px, 2.2vw, 28px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: var(--space-3);
  text-wrap: balance;
  max-width: 28ch;
}

/* ─── SECTION HELPERS ─── */

.section {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--ink-10);
}
.section.tight { padding: var(--space-5) 0; }
.section.heavy { padding: var(--space-7) 0; }
.section.last-of-page { border-bottom: 1px solid var(--ink); }

.spec-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-5);
}

.spec-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-60);
  padding-top: 6px;
}
.spec-label .num { color: var(--signal); font-weight: 500; display: block; margin-bottom: 6px; }
.spec-label .meta { display: block; color: var(--ink-40); font-size: 10px; margin-top: var(--space-2); letter-spacing: 0.1em; }

.spec-body { max-width: var(--read-max); }
.spec-body h2 {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: var(--space-3);
}
.spec-body h3 {
  font-family: var(--body);
  font-weight: 500;
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -0.008em;
  color: var(--ink);
  margin-bottom: var(--space-2);
}
.spec-body h3 .num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--signal);
  letter-spacing: 0.1em;
  margin-right: var(--space-2);
  font-weight: 500;
  vertical-align: 4px;
}
.spec-body p {
  font-family: var(--body);
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-90);
  margin-bottom: var(--space-3);
  text-wrap: pretty;
}
.spec-body p:last-child { margin-bottom: 0; }
.spec-body em { font-style: italic; }
.spec-body strong { font-weight: 500; }

/* ─── PROSE BLOCK — long-form essay-grade reading ─── */

.prose {
  max-width: var(--read-max);
}
.prose p {
  font-family: var(--body);
  font-size: 19px;
  line-height: 1.7;
  color: var(--ink-90);
  margin-bottom: var(--space-3);
  text-wrap: pretty;
}
.prose p:last-child { margin-bottom: 0; }
.prose em { font-style: italic; }
.prose strong { font-weight: 500; }
.prose .lift {
  font-family: var(--body);
  font-style: italic;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.4;
  color: var(--ink);
  border-left: 2px solid var(--signal);
  padding: var(--space-1) 0 var(--space-1) var(--space-3);
  margin: var(--space-4) 0;
  max-width: 60ch;
}

/* ─── CTAs ─── */

.cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  padding: 16px 22px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.cta-primary:hover { background: var(--signal); border-color: var(--signal); }
.cta-primary .arrow,
.cta-secondary .arrow,
.cta-quiet .arrow { display: inline-block; transition: transform 0.2s; }
.cta-primary:hover .arrow,
.cta-secondary:hover .arrow,
.cta-quiet:hover .arrow { transform: translateX(4px); }

.cta-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 15px 21px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.cta-secondary:hover { background: var(--ink); color: var(--paper); }

.cta-quiet {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-20);
  padding-bottom: 3px;
  transition: border-color 0.2s, color 0.2s;
  display: inline-block;
}
.cta-quiet:hover { border-color: var(--signal); color: var(--signal); }

.cta-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  align-items: center;
  margin-top: var(--space-4);
}

/* ─── INLINE FOOTNOTE MARKERS ─── */

.fn {
  font-family: var(--mono);
  font-size: 0.5em;
  vertical-align: super;
  color: var(--signal);
  font-weight: 500;
  text-decoration: none;
  letter-spacing: 0;
  padding-left: 2px;
  line-height: 0;
}

.footnotes {
  padding: var(--space-5) 0 var(--space-6);
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-5);
  border-bottom: 1px solid var(--ink);
}
.footnotes-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-60);
  padding-top: 6px;
}
.footnotes ol {
  list-style: none;
  counter-reset: fn;
  padding: 0;
  max-width: var(--read-max);
}
.footnotes li {
  counter-increment: fn;
  padding: var(--space-2) 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.55;
  color: var(--ink-80);
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: var(--space-2);
  border-top: 1px solid var(--ink-05);
}
.footnotes li:first-child { border-top: none; }
.footnotes li::before { content: counter(fn); color: var(--signal); font-weight: 500; }
.footnotes a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-20);
  transition: border-color 0.2s, color 0.2s;
}
.footnotes a:hover { border-color: var(--signal); color: var(--signal); }
.footnotes em { font-style: italic; }

/* ─── FOOTER ─── */

.footer {
  padding: var(--space-6) 0 var(--space-5);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-60);
  border-top: 1px solid var(--ink);
}
/* Editorial sign-off — gets serif weight, not muted gray. */
.footer-phrase {
  font-family: var(--body);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-transform: none;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--ink-10);
  max-width: 18ch;
  text-wrap: balance;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-4);
  align-items: start;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--ink-10);
}
.footer-grid h4 { color: var(--ink); font-weight: 500; margin-bottom: var(--space-2); letter-spacing: 0.1em; }
.footer-grid a {
  color: var(--ink-60);
  text-decoration: none;
  display: block;
  padding: 4px 0;
  transition: color 0.2s;
}
.footer-grid a:hover { color: var(--signal); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-3);
  color: var(--ink-40);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: none;
}
.footer-legal a {
  color: var(--ink-40);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-10);
  transition: color 0.2s, border-color 0.2s;
}
.footer-legal a:hover { color: var(--signal); border-color: var(--signal); }

/* ─── PROOF STRIP (logo wall, typographic) ─── */

.proof {
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--ink);
  border-top: 1px solid var(--ink);
}
.proof-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-3);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-60);
}
.proof-head .lbl { color: var(--ink); font-weight: 500; }
.proof-head .meta { color: var(--ink-40); font-size: 10px; }

.proof-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--ink-10);
  border: 1px solid var(--ink-10);
}
.proof-cell {
  background: var(--paper);
  padding: var(--space-3) var(--space-2);
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-80);
  text-align: center;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 500;
  line-height: 1.2;
  filter: grayscale(1);
  transition: color 0.2s;
}
.proof-cell:hover { color: var(--ink); }
.proof-cell.serif { font-family: var(--body); text-transform: none; letter-spacing: -0.005em; font-size: 18px; font-style: italic; font-weight: 600; }
.proof-cell.serif-up { font-family: var(--body); text-transform: uppercase; letter-spacing: 0.06em; font-size: 14px; font-weight: 600; }
.proof-cell.condensed { font-weight: 700; letter-spacing: -0.01em; font-size: 16px; }
.proof-cell.lowercase { text-transform: lowercase; letter-spacing: -0.01em; font-weight: 600; font-size: 16px; font-family: var(--body); }
.proof-cell.tight { font-size: 11px; line-height: 1.25; }
.proof-cell.thin { font-weight: 400; letter-spacing: 0.16em; }

/* ─── MOBILE ─── */

@media (max-width: 720px) {
  .page { padding: 0 var(--space-3); }

  .masthead {
    margin: 0 calc(var(--space-3) * -1);
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }
  .masthead-row {
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
  }
  .masthead-toggle { display: inline-flex; }
  .masthead-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-2) 0 var(--space-3);
    border-top: 1px solid var(--ink-10);
    margin-top: var(--space-2);
  }
  .masthead-nav a {
    width: 100%;
    padding: 16px 2px;
    margin: 0;
    border-bottom: 1px solid var(--ink-05);
    font-size: 14px;
    letter-spacing: 0.06em;
  }
  .masthead-nav a::after { display: none; }
  .masthead-nav a:last-child { border-bottom: none; }
  /* Mobile: nav is visible only when the toggle's aria-expanded is true.
     Uses general-sibling combinator because the toggle button is followed
     by the nav within the same .masthead-row flex container. */
  .masthead-toggle[aria-expanded="true"] ~ .masthead-nav { display: flex; }

  .page-header { padding: var(--space-5) 0 var(--space-4); }

  .section { padding: var(--space-5) 0; }
  .section.heavy { padding: var(--space-6) 0; }

  .spec-row { grid-template-columns: 1fr; gap: var(--space-2); }
  .spec-label { padding-top: 0; }

  .footnotes { grid-template-columns: 1fr; gap: var(--space-2); }

  .footer-grid { grid-template-columns: 1fr; gap: var(--space-3); }

  .proof-grid { grid-template-columns: repeat(3, 1fr); }
  .proof-cell { min-height: 76px; font-size: 11px; }

  .cta-primary, .cta-secondary { padding: 14px 18px; font-size: 11px; }
}

@media (max-width: 480px) {
  .proof-grid { grid-template-columns: repeat(2, 1fr); }
}