/* ============================================================
   Z-Screen Pilot Release - site styles
   Built on Zafrens brand tokens (zafrens-brand.css)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter+Tight:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

html { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }

body {
  font-family: var(--zf-font-ui);
  background: var(--zf-paper);
  color: var(--zf-night);
  font-size: 17px;
  line-height: 1.55;
  font-weight: 400;
  letter-spacing: -0.005em;
}

/* ---------- Layout ---------- */

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 32px; }
.wrap-narrow { max-width: 760px; margin: 0 auto; padding: 0 32px; }

@media (max-width: 640px) {
  .wrap, .wrap-narrow { padding: 0 20px; }
  body { font-size: 16px; }
}

/* ---------- Top nav ---------- */

.topnav {
  border-bottom: 1px solid rgba(11,18,32,0.08);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(140%) blur(8px);
  background: rgba(251,250,247,0.92);
}
.topnav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 32px;
}
.topnav-brand { display: inline-flex; align-items: center; gap: 0.9em; color: var(--zf-steel); text-decoration: none; }
.topnav-brand img { height: 26px; width: auto; }
.topnav-brand .divider { width: 1px; height: 18px; background: currentColor; opacity: 0.25; }
.topnav-brand .name {
  font-family: var(--zf-font-wordmark);
  font-weight: 300;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  font-size: 14px;
  color: var(--zf-steel);
}

.topnav-papers {
  display: flex;
  align-items: center;
  gap: 18px;
}
.topnav-papers a {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--zf-night);
  opacity: 0.45;
  transition: opacity 0.15s;
}
.topnav-papers a:hover { opacity: 1; }
.topnav-papers a.active { opacity: 1; color: var(--zf-steel); }

@media (max-width: 900px) {
  .topnav-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 0 0;
  }
  .topnav-brand {
    align-self: flex-start;
    padding-bottom: 10px;
  }
  .topnav-papers {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 18px;
    padding: 10px 0;
    border-top: 1px solid rgba(11,18,32,0.06);
    -webkit-mask-image: linear-gradient(to right, black 0, black calc(100% - 24px), transparent 100%);
            mask-image: linear-gradient(to right, black 0, black calc(100% - 24px), transparent 100%);
  }
  .topnav-papers::-webkit-scrollbar { display: none; }
  .topnav-papers a {
    flex-shrink: 0;
    white-space: nowrap;
  }
}

/* ---------- Type ---------- */

h1, h2, h3, h4 {
  font-family: var(--zf-font-ui);
  color: var(--zf-night);
  letter-spacing: -0.022em;
  line-height: 1.1;
  font-weight: 600;
  text-wrap: balance;
}

h1 { font-size: clamp(40px, 5.4vw, 68px); font-weight: 600; letter-spacing: -0.03em; }
h2 { font-size: clamp(28px, 3.4vw, 40px); font-weight: 600; }
h3 { font-size: 22px; font-weight: 600; letter-spacing: -0.015em; }
h4 { font-size: 16px; font-weight: 600; }

p { text-wrap: pretty; }
p + p { margin-top: 1em; }

a { color: var(--zf-steel); }

.eyebrow {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--zf-steel);
  font-weight: 500;
}

.lede {
  font-size: clamp(19px, 1.8vw, 22px);
  line-height: 1.5;
  color: rgba(11,18,32,0.72);
  font-weight: 400;
  letter-spacing: -0.01em;
}

.muted { color: rgba(11,18,32,0.55); }
.tiny { font-size: 13px; }
.mono { font-family: var(--zf-font-mono); }

/* ---------- Hero (intro page) ---------- */

.hero {
  padding: 72px 0 80px;
  border-bottom: 1px solid rgba(11,18,32,0.08);
}
.hero h1 {
  margin-top: 18px;
  max-width: 16ch;
}
.hero .lede {
  margin-top: 28px;
  max-width: 56ch;
}

/* ---------- Stat strip ---------- */

.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid rgba(11,18,32,0.1);
  border-bottom: 1px solid rgba(11,18,32,0.1);
  padding: 36px 0;
}
.stat-strip .stat {
  padding: 0 28px;
  border-right: 1px solid rgba(11,18,32,0.08);
}
.stat-strip .stat:first-child { padding-left: 0; }
.stat-strip .stat:last-child { border-right: 0; padding-right: 0; }

.stat .stat-num,
.stat .n {
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 600;
  color: var(--zf-night);
  letter-spacing: -0.025em;
  line-height: 1;
  display: block;
}
.stat .stat-key,
.stat .l {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(11,18,32,0.55);
  margin-top: 12px;
  display: block;
}

@media (max-width: 720px) {
  .stat-strip { grid-template-columns: repeat(2, 1fr); gap: 24px 0; }
  .stat-strip .stat { padding: 0 20px; border-right: 1px solid rgba(11,18,32,0.08); }
  .stat-strip .stat:nth-child(2) { border-right: 0; }
  .stat-strip .stat:nth-child(2n+1) { padding-left: 0; }
  .stat-strip .stat:nth-child(2n) { padding-right: 0; }
}

/* ---------- Section ---------- */

section { padding: 72px 0; }
section.section-tight { padding: 48px 0; }
section + section { border-top: 1px solid rgba(11,18,32,0.08); }

.section-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
}
.section-aside {
  max-width: 36ch;
  font-size: 15px;
  line-height: 1.55;
  color: rgba(11,18,32,0.65);
}

/* ---------- Paper grid (intro) ---------- */

.paper-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  background: transparent;
  border: 0;
}
@media (max-width: 760px) {
  .paper-grid { grid-template-columns: 1fr; gap: 16px; }
}

.paper-card {
  background:
    linear-gradient(180deg, var(--zf-paper) 0%, color-mix(in oklab, var(--zf-paper) 92%, var(--zf-bone) 8%) 100%);
  padding: 36px 36px 32px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: relative;
  min-height: 320px;
  border: 1px solid rgba(11,18,32,0.09);
  border-radius: 6px;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.6) inset,
    0 1px 2px rgba(11,18,32,0.04),
    0 8px 20px -12px rgba(11,18,32,0.10);
  transition:
    transform 0.25s cubic-bezier(.2,.7,.2,1),
    box-shadow 0.25s cubic-bezier(.2,.7,.2,1),
    border-color 0.2s,
    background 0.2s;
  overflow: hidden;
}
.paper-card .card-title + .card-summary { margin-top: 12px; }

/* Top-right corner mark — a mono crosshair-style ornament */
.paper-card::before {
  content: '';
  position: absolute;
  top: 14px; right: 14px;
  width: 14px; height: 14px;
  border-top: 1px solid rgba(22,80,121,0.45);
  border-right: 1px solid rgba(22,80,121,0.45);
  opacity: 0.7;
  transition: opacity 0.2s, transform 0.25s;
}
.paper-card:hover::before { opacity: 1; transform: translate(2px, -2px); }

.paper-card:hover {
  transform: translateY(-2px);
  border-color: rgba(22,80,121,0.35);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.6) inset,
    0 2px 4px rgba(11,18,32,0.05),
    0 24px 40px -22px rgba(11,18,32,0.22);
}
.paper-card .card-num {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--zf-steel);
  font-weight: 500;
}
.paper-card .card-title {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--zf-night);
  text-wrap: balance;
  transition: color 0.2s;
}
.paper-card:hover .card-title { color: var(--zf-steel); }
.paper-card .card-summary {
  font-size: 15.5px;
  line-height: 1.55;
  color: rgba(11,18,32,0.7);
  flex: 1;
}
.paper-card .card-cta {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--zf-steel);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid rgba(11,18,32,0.08);
}
.paper-card .card-cta::after {
  content: "\2192";
  transition: transform 0.2s;
  font-family: var(--zf-font-ui);
}
.paper-card:hover .card-cta::after { transform: translateX(4px); }

/* ---------- Paper hero (paper detail page) ---------- */

.paper-hero {
  padding: 64px 0 56px;
  border-bottom: 1px solid rgba(11,18,32,0.08);
}
.paper-hero .crumb {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(11,18,32,0.55);
  margin-bottom: 24px;
}
.paper-hero .crumb a { color: rgba(11,18,32,0.55); text-decoration: none; }
.paper-hero .crumb a:hover { color: var(--zf-steel); }
.paper-hero .crumb .sep { margin: 0 10px; opacity: 0.5; }
.paper-hero .pnum {
  font-family: var(--zf-font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--zf-steel);
  font-weight: 500;
  margin-bottom: 16px;
}
.paper-hero h1 {
  font-size: clamp(34px, 4.6vw, 56px);
  max-width: 22ch;
}
.paper-hero .paper-lede {
  margin-top: 28px;
  max-width: 60ch;
  font-size: clamp(18px, 1.5vw, 21px);
  line-height: 1.5;
  color: rgba(11,18,32,0.72);
}

/* ---------- Hero figure (per-paper data-viz) ---------- */

.hero-figure {
  margin-top: 48px;
  padding: 32px;
  background: var(--zf-night);
  color: var(--zf-paper);
  border-radius: 4px;
  position: relative;
  overflow: hidden;
}
.hero-figure .figcaption {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(251,250,247,0.55);
  margin-top: 24px;
}

/* ---------- TL;DR card ---------- */

.tldr {
  padding: 36px 40px;
  background: var(--zf-bone);
  border-left: 2px solid var(--zf-steel);
  margin: 0;
}
.tldr .label {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--zf-steel);
  margin-bottom: 14px;
  font-weight: 500;
}
.tldr p {
  font-size: 19px;
  line-height: 1.55;
  color: var(--zf-night);
  letter-spacing: -0.005em;
}

/* ---------- Two-col layout ---------- */

.two-col {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
  align-items: start;
}
@media (max-width: 800px) {
  .two-col { grid-template-columns: 1fr; gap: 16px; }
}
.two-col .col-label {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--zf-steel);
  font-weight: 500;
  position: sticky;
  top: 90px;
}
.two-col .col-body p { font-size: 17.5px; line-height: 1.65; max-width: 68ch; }
.two-col .col-body p + p { margin-top: 1.1em; }

/* ---------- Findings grid ---------- */

.findings {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  background: transparent;
  border: 0;
}
@media (max-width: 720px) {
  .findings { grid-template-columns: 1fr; gap: 14px; }
}
.finding {
  background: var(--zf-paper);
  padding: 32px 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid rgba(11,18,32,0.09);
  border-radius: 6px;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.6) inset,
    0 1px 2px rgba(11,18,32,0.04);
  position: relative;
  transition: transform 0.25s cubic-bezier(.2,.7,.2,1), box-shadow 0.25s, border-color 0.2s;
}
.finding::before {
  content: '';
  position: absolute;
  top: 0; right: 32px;
  width: 24px; height: 1px;
  background: var(--zf-steel);
  opacity: 0.55;
}
.finding:hover {
  transform: translateY(-1px);
  border-color: rgba(22,80,121,0.3);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.6) inset,
    0 12px 24px -16px rgba(11,18,32,0.18);
}
.finding .fnum {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--zf-steel);
  font-weight: 500;
}
.finding h4 {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.3;
  text-wrap: balance;
}
.finding p {
  color: rgba(11,18,32,0.72);
  font-size: 15.5px;
  line-height: 1.55;
}
.finding .stat-callout {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid rgba(11,18,32,0.08);
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.finding .stat-callout .v {
  font-family: var(--zf-font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--zf-steel);
  letter-spacing: -0.01em;
}
.finding .stat-callout .k {
  font-family: var(--zf-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(11,18,32,0.5);
}

/* ---------- Downloads ---------- */

.downloads {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  background: transparent;
  border: 0;
}
@media (max-width: 720px) {
  .downloads { grid-template-columns: 1fr; gap: 14px; }
}
.dl {
  background: var(--zf-paper);
  padding: 28px 28px 24px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid rgba(11,18,32,0.1);
  border-radius: 6px;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.6) inset,
    0 1px 2px rgba(11,18,32,0.04);
  transition: background 0.2s, color 0.2s, transform 0.25s cubic-bezier(.2,.7,.2,1), box-shadow 0.25s, border-color 0.2s;
}
.dl:hover {
  background: var(--zf-night);
  color: var(--zf-paper);
  transform: translateY(-2px);
  border-color: var(--zf-night);
  box-shadow: 0 18px 32px -18px rgba(11,18,32,0.4);
}
.dl:hover .dl-meta { color: rgba(251,250,247,0.6); }
.dl:hover .dl-cta { color: var(--zf-paper); }
.dl-icon {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 6px;
}
.dl-icon svg { width: 24px; height: 24px; }
.dl-title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.dl-meta {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(11,18,32,0.5);
}
.dl-cta {
  margin-top: 12px;
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--zf-steel);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.dl-cta::after { content: "\2193"; }

/* ---------- Prev/next nav ---------- */

.paper-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  background: transparent;
  border: 0;
  margin-top: 0;
}
@media (max-width: 640px) { .paper-nav { grid-template-columns: 1fr; gap: 12px; } }
.paper-nav a {
  background: var(--zf-paper);
  padding: 28px 32px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid rgba(11,18,32,0.09);
  border-radius: 6px;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.6) inset,
    0 1px 2px rgba(11,18,32,0.04);
  transition: background 0.2s, transform 0.25s cubic-bezier(.2,.7,.2,1), box-shadow 0.25s, border-color 0.2s;
}
.paper-nav a:hover {
  background: var(--zf-bone);
  transform: translateY(-2px);
  border-color: rgba(22,80,121,0.3);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.6) inset,
    0 12px 24px -16px rgba(11,18,32,0.18);
}
.paper-nav .label {
  font-family: var(--zf-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(11,18,32,0.5);
}
.paper-nav .ttl {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--zf-night);
}
.paper-nav .next { text-align: right; }

/* ---------- Footer ---------- */

footer.site-footer {
  padding: 48px 0 56px;
  border-top: 1px solid rgba(11,18,32,0.08);
  background: var(--zf-bone);
}
.site-footer .row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  flex-wrap: wrap;
}
.site-footer .meta {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(11,18,32,0.5);
  line-height: 1.8;
}
.site-footer a { color: rgba(11,18,32,0.7); text-decoration: none; }
.site-footer a:hover { color: var(--zf-steel); }

/* ---------- Pilot scope (intro) ---------- */

.scope {
  background: var(--zf-night);
  color: var(--zf-paper);
  padding: 56px 0;
}
.scope .lede { color: rgba(251,250,247,0.7); }
.scope h2 { color: var(--zf-paper); }

.scope .scope-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: 40px;
  border-top: 1px solid rgba(251,250,247,0.15);
  padding-top: 36px;
}
@media (max-width: 720px) {
  .scope .scope-grid { grid-template-columns: repeat(2,1fr); gap: 32px 0; }
}

.scope-cell {
  padding: 0 28px;
  border-right: 1px solid rgba(251,250,247,0.12);
}
.scope-cell:first-child { padding-left: 0; }
.scope-cell:last-child { border-right: 0; padding-right: 0; }
.scope-num {
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 600;
  color: var(--zf-paper);
  letter-spacing: -0.025em;
  line-height: 1;
}
.scope-key {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(251,250,247,0.55);
  margin-top: 12px;
}

/* ============================================================
   Pass 2 - Visual refresh for full-screen laptop rendering
   Scales typography on wide viewports, adds hero backdrop,
   strengthens dark sections, refines card affordances.
   ============================================================ */

/* Wider content on big screens */
@media (min-width: 1280px) {
  .wrap { max-width: 1280px; padding: 0 40px; }
  .wrap-narrow { max-width: 820px; padding: 0 40px; }
}
@media (min-width: 1600px) {
  .wrap { max-width: 1360px; }
  .wrap-narrow { max-width: 860px; }
}

/* Larger typography on big screens */
@media (min-width: 1280px) {
  body { font-size: 18px; }
  h1 { font-size: clamp(56px, 5.6vw, 96px); letter-spacing: -0.035em; }
  h2 { font-size: clamp(34px, 3.4vw, 48px); }
  h3 { font-size: 26px; }
  .lede { font-size: 23px; line-height: 1.5; }
  .paper-hero h1 { font-size: clamp(44px, 4.8vw, 68px); }
  .paper-hero .paper-lede { font-size: 22px; }
}

/* Section rhythm scales on big screens */
@media (min-width: 1280px) {
  section { padding: 104px 0; }
  .hero { padding: 112px 0 96px; }
  .paper-hero { padding: 80px 0 64px; }
}

/* Hero backdrop: subtle dot grid + corner accent gradient */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at calc(100% + 80px) -80px, rgba(22,80,121,0.10), transparent 45%),
    radial-gradient(circle at -80px calc(100% + 80px), rgba(22,80,121,0.06), transparent 45%),
    var(--zf-paper);
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(11,18,32,0.05) 1px, transparent 1.6px);
  background-size: 28px 28px;
  background-position: 0 0;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 18%, black 65%, transparent 100%);
          mask-image: linear-gradient(to bottom, transparent 0%, black 18%, black 65%, transparent 100%);
  opacity: 0.9;
}
.hero .wrap { position: relative; z-index: 1; }

/* Hero h1: a vertical accent line on the eyebrow */
.hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}
.hero .eyebrow::before {
  content: '';
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--zf-steel);
  opacity: 0.7;
}

/* Stat strip: stronger numbers, top accent line on hover */
.stat-strip { padding: 44px 0; }
@media (min-width: 1280px) {
  .stat-strip { padding: 52px 0; }
  .stat .stat-num, .stat .n { font-size: 56px; letter-spacing: -0.03em; }
  .stat .stat-key, .stat .l { margin-top: 16px; }
}
.stat {
  position: relative;
}
.stat::before {
  content: '';
  position: absolute;
  top: -1px; left: 0;
  width: 0; height: 2px;
  background: var(--zf-steel);
  transition: width 0.3s ease;
}
.stat-strip:hover .stat::before { width: 32px; }
.stat:hover::before { width: 64px; }

/* Section title row: cleaner large-screen layout */
@media (min-width: 1280px) {
  .section-title-row { gap: 56px; margin-bottom: 56px; }
  .section-aside { font-size: 17px; max-width: 38ch; }
}

/* Paper card hover: steel accent stripe along the left edge */
.paper-card::after {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 0;
  background: var(--zf-steel);
  transition: width 0.22s ease;
  pointer-events: none;
}
.paper-card:hover::after { width: 3px; }
@media (min-width: 1280px) {
  .paper-card { padding: 44px 44px 40px; min-height: 360px; }
  .paper-card .card-title { font-size: 26px; }
  .paper-card .card-summary { font-size: 16.5px; line-height: 1.6; }
}

/* TL;DR: more presence */
.tldr {
  padding: 40px 44px;
  background: linear-gradient(135deg, var(--zf-bone) 0%, #ece6d8 100%);
  border-left-width: 3px;
  position: relative;
}
.tldr::before {
  content: '';
  position: absolute;
  top: -1px; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(to right, var(--zf-steel) 0%, transparent 30%);
  opacity: 0.4;
}
@media (min-width: 1280px) {
  .tldr { padding: 52px 56px; }
  .tldr p { font-size: 21px; line-height: 1.55; }
}

/* Hero figure: depth + gradient */
.hero-figure {
  background: linear-gradient(160deg, #0E1726 0%, #070C16 100%);
  padding: 40px;
  border-radius: 8px;
  box-shadow:
    0 28px 56px -20px rgba(11,18,32,0.28),
    0 6px 14px rgba(11,18,32,0.08);
  position: relative;
  overflow: hidden;
}
.hero-figure::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 0% 0%, rgba(126,185,224,0.10), transparent 40%),
    radial-gradient(circle at 100% 100%, rgba(22,80,121,0.18), transparent 50%);
  pointer-events: none;
}
.hero-figure svg, .hero-figure .figcaption { position: relative; z-index: 1; }
@media (min-width: 1280px) {
  .hero-figure { padding: 56px; }
}

/* Findings grid: more spacious cards on wide screens */
@media (min-width: 1280px) {
  .finding { padding: 40px 40px 36px; gap: 14px; }
  .finding h4 { font-size: 21px; }
  .finding p { font-size: 16.5px; line-height: 1.6; }
  .finding .stat-callout .v { font-size: 26px; }
}

/* Downloads: spacious on wide screens */
@media (min-width: 1280px) {
  .dl { padding: 36px 32px 30px; }
  .dl-title { font-size: 19px; }
}

/* Two-col Why-it-matters: better large-screen scale */
@media (min-width: 1280px) {
  .two-col { grid-template-columns: 240px 1fr; gap: 72px; }
  .two-col .col-body p { font-size: 19px; line-height: 1.65; }
}

/* Top nav: refined */
.topnav {
  background: rgba(251,250,247,0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
}
@media (min-width: 1280px) {
  .topnav-inner { padding: 22px 0; }
  .topnav-brand .name { font-size: 15px; }
}

/* Scope section: deeper gradient + ambient glow */
.scope {
  background: linear-gradient(180deg, var(--zf-night) 0%, #060A14 100%);
  padding: 96px 0;
  position: relative;
  overflow: hidden;
}
.scope::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 28%, rgba(126,185,224,0.10), transparent 45%),
    radial-gradient(circle at 82% 72%, rgba(22,80,121,0.18), transparent 50%);
  pointer-events: none;
}
.scope .wrap { position: relative; z-index: 1; }
@media (min-width: 1280px) {
  .scope { padding: 120px 0; }
  .scope-num { font-size: 56px; font-weight: 500; }
  .scope-cell { padding: 0 36px; }
}

/* Paper hero: subtle accent on detail pages */
.paper-hero {
  position: relative;
  background:
    radial-gradient(circle at calc(100% + 60px) 0%, rgba(22,80,121,0.06), transparent 40%),
    var(--zf-paper);
  overflow: hidden;
}
.paper-hero .pnum {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.paper-hero .pnum::before {
  content: '';
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--zf-steel);
  opacity: 0.7;
}

/* Section dividers a touch lighter */
section + section { border-top: 1px solid rgba(11,18,32,0.06); }

/* Footer: more presence */
.site-footer { padding: 56px 0 64px; }
@media (min-width: 1280px) { .site-footer { padding: 72px 0 80px; } }

/* Smooth font hinting for big sizes */
@media (min-width: 1280px) {
  body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
}

/* Anchor underline on hover for inline links */
.col-body a, .lede a, .tldr a { text-decoration: underline; text-decoration-color: rgba(22,80,121,0.4); text-underline-offset: 3px; }
.col-body a:hover, .lede a:hover, .tldr a:hover { text-decoration-color: var(--zf-steel); }

/* ============================================================
   Hero CTA buttons + metadata strip (paper detail pages)
   Promoted from v2 prototype after sign-off.
   ============================================================ */

.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-top: 32px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--zf-steel);
  color: var(--zf-paper);
  padding: 14px 24px;
  border-radius: 4px;
  text-decoration: none;
  font-family: var(--zf-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: background 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--zf-steel);
  box-shadow: 0 1px 2px rgba(11,18,32,0.06), 0 4px 10px -4px rgba(22,80,121,0.25);
}
.btn-primary:hover {
  background: var(--zf-night);
  border-color: var(--zf-night);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(11,18,32,0.08), 0 12px 22px -8px rgba(11,18,32,0.3);
}
.btn-primary svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn-secondary {
  color: var(--zf-steel);
  text-decoration: none;
  font-family: var(--zf-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  padding: 14px 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color 0.2s, transform 0.2s;
}
.btn-secondary:hover {
  color: var(--zf-night);
  transform: translateX(2px);
}

.hero-meta {
  font-family: var(--zf-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(11,18,32,0.5);
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(11,18,32,0.08);
}
.hero-meta .dot { margin: 0 10px; opacity: 0.4; }

@media (min-width: 1280px) {
  .hero-actions { margin-top: 40px; gap: 18px; }
  .btn-primary { padding: 16px 28px; font-size: 13px; }
  .btn-secondary { padding: 16px 10px; font-size: 13px; }
  .hero-meta { font-size: 12px; margin-top: 28px; padding-top: 22px; }
}
@media (max-width: 480px) {
  .hero-actions { gap: 10px; }
  .btn-primary { padding: 12px 18px; font-size: 11px; gap: 8px; }
  .btn-secondary { padding: 12px 4px; font-size: 11px; }
  .btn-primary svg { width: 14px; height: 14px; }
}