/* DeltaSignal Research: shared stylesheet.
   Design tokens from the DeltaSignal design system: Playfair Display for
   headlines, Inter for body, JetBrains Mono for data labels. Primary navy
   #0A192F, gilt #D4AF37 used sparingly, hairlines #E2E8F0, white canvas,
   sharp 0px corners throughout. */

:root {
  --navy: #0A192F;
  --ink: #1E293B;
  --body: #334155;
  --slate: #475569;
  --gilt: #D4AF37;
  --hairline: #E2E8F0;
  --input-border: #CBD5E1;
  --wash: #FAFAFA;
  --well: #F1F5F9;
  --error: #991B1B;
}

* { box-sizing: border-box; }

html { margin: 0; padding: 0; }

body {
  margin: 0;
  padding: 0;
  background: #FFFFFF;
  color: var(--body);
  font-family: 'Inter', -apple-system, 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.65;
  letter-spacing: 0;
}

.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 3rem;
}

a { color: var(--navy); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: #000000; }

/* Masthead */

.masthead {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}

.masthead-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.9rem 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: #000000;
  border-radius: 50%;
  overflow: hidden;
  flex: 0 0 auto;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}

.brand-name {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--navy);
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.main-nav a {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover { color: var(--navy); }

.main-nav a.active {
  color: var(--navy);
  border-bottom: 2px solid var(--navy);
}

/* Headings and editorial type */

h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 56px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--navy);
  margin: 0 0 1rem 0;
}

h2 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 28px;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--navy);
  margin: 2.25rem 0 0.75rem 0;
}

p { margin: 0 0 1rem 0; }

.eyebrow, .kicker {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 0.75rem 0;
}

.mono, .meta {
  font-family: 'JetBrains Mono', 'SFMono-Regular', monospace;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.meta a { color: var(--slate); }
.meta a:hover { color: var(--navy); }

.lede {
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  max-width: 46rem;
}

/* Page head (index hero and category headers) */

.page-head {
  padding: 2.5rem 0 2rem 0;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 2.5rem;
}

.page-head .rule {
  width: 56px;
  height: 2px;
  background: var(--gilt);
  margin: 0 0 1.25rem 0;
}

.breadcrumb {
  margin-bottom: 1rem;
}

/* Cards */

.card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.card-stack {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.cat-card, .report-card {
  background: #FFFFFF;
  border: 1px solid var(--hairline);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.cat-card:hover, .report-card:hover {
  border-color: var(--navy);
  box-shadow: 0 4px 20px -2px rgba(10, 25, 47, 0.04);
}

.cat-card h2, .report-card h2 {
  margin: 0 0 0.5rem 0;
  font-size: 22px;
  font-weight: 500;
  line-height: 1.35;
}

.cat-card h2 a, .report-card h2 a {
  text-decoration: none;
  color: var(--navy);
}

.cat-card h2 a:hover, .report-card h2 a:hover { color: #000000; }

.card-desc { color: var(--body); margin-bottom: 1rem; }

.card-meta {
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--hairline);
}

.card-latest {
  font-family: 'JetBrains Mono', 'SFMono-Regular', monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate);
  margin-top: auto;
  margin-bottom: 0;
}

.card-latest .gilt-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--gilt);
  margin-right: 0.5rem;
}

.card-action {
  margin-top: auto;
  margin-bottom: 0;
}

.card-action a, .back-link a {
  font-family: 'JetBrains Mono', 'SFMono-Regular', monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-bottom: 1px solid var(--navy);
  padding-bottom: 2px;
}

.empty-note {
  border: 1px solid var(--hairline);
  background: var(--wash);
  padding: 24px;
  margin-bottom: 2.5rem;
}

.empty-note p { margin: 0; color: var(--ink); }

.back-link { margin-bottom: 2.5rem; }

/* Report pages */

.report-grid {
  display: grid;
  grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  gap: 2rem;
  align-items: start;
  padding: 2.5rem 0;
}

.report-article h1 {
  font-size: 40px;
  line-height: 1.2;
}

.report-article h2 {
  border-top: 2px solid var(--navy);
  padding-top: 1.25rem;
  margin-top: 2.5rem;
}

.report-article p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
}

.report-article ul {
  padding-left: 1.2rem;
  margin: 0 0 1rem 0;
}

.report-article li {
  margin-bottom: 0.4rem;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
}

.report-aside {
  border: 1px solid var(--hairline);
  background: var(--wash);
  padding: 24px;
}

.report-aside .eyebrow { color: var(--navy); }

.report-aside dl { margin: 0; }

.report-aside .fact {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--hairline);
}

.report-aside .fact:last-child { border-bottom: none; }

.report-aside dt {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 0.2rem;
}

.report-aside dd {
  font-family: 'JetBrains Mono', 'SFMono-Regular', monospace;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--navy);
  margin: 0;
}

/* Gate form (appearance only; ids and behavior come from the report pages) */

form { margin-top: 1.25rem; }

label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 0.35rem;
}

input[type=email], input[type=text] {
  width: 100%;
  max-width: 26rem;
  padding: 0.6rem 0.75rem;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  color: var(--ink);
  background: #FFFFFF;
  border: 1px solid var(--input-border);
  border-radius: 0;
  margin-bottom: 0.9rem;
}

input[type=email]:focus, input[type=text]:focus {
  outline: none;
  border-color: var(--navy);
  box-shadow: inset 0 0 0 1px var(--navy);
}

button {
  background: var(--navy);
  color: #FFFFFF;
  border: 1px solid var(--navy);
  border-radius: 0;
  padding: 12px 24px;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  margin-top: 0.25rem;
}

button:hover { background: var(--ink); }

#done, #already, #failed {
  display: none;
  border: 1px solid var(--navy);
  background: var(--wash);
  padding: 1rem 1.25rem;
  margin-top: 1rem;
}

#done strong, #already strong, #failed strong {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 18px;
  color: var(--navy);
}

#done p, #already p, #failed p { margin: 0.35rem 0 0 0; }

#error { color: var(--error); }

/* Footer */

.site-footer {
  border-top: 1px solid var(--hairline);
  background: var(--wash);
  margin-top: 2.5rem;
}

.footer-inner {
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-brand {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 15px;
  font-weight: 600;
  color: var(--navy);
  margin: 0;
}

.footer-inner p { margin: 0; }

/* Responsive */

@media (max-width: 900px) {
  .report-grid { grid-template-columns: 1fr; }
  .report-aside { order: 2; }
}

@media (max-width: 768px) {
  .wrap { padding: 0 1.25rem; }
  .masthead-inner { padding: 0.75rem 1.25rem; }
  .brand-name { font-size: 19px; white-space: normal; }
  .main-nav { gap: 1rem; }
  h1 { font-size: 36px; line-height: 1.2; }
  .report-article h1 { font-size: 28px; }
  h2 { font-size: 22px; }
  .card-grid { grid-template-columns: 1fr; }
  .page-head { padding: 1.75rem 0 1.5rem 0; margin-bottom: 1.75rem; }
  .report-grid { padding: 1.75rem 0; }
}

/* Index: table of contents and category sections (added 2026-11-01) */

.toc {
  border: 1px solid var(--hairline);
  background: var(--wash);
  padding: 24px;
  margin-bottom: 0.5rem;
}

.toc .eyebrow { margin-bottom: 1rem; }

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem 2.5rem;
}

.toc-list a {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 19px;
  font-weight: 600;
  color: var(--navy);
  text-decoration: none;
}

.toc-list a:hover { color: #000000; text-decoration: underline; text-underline-offset: 3px; }

.toc-count {
  display: block;
  font-family: 'JetBrains Mono', 'SFMono-Regular', monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate);
  margin-top: 0.15rem;
}

.cat-section {
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--hairline);
}

.cat-section:last-child { border-bottom: none; }

.cat-section h2 { margin: 0 0 0.5rem 0; }

.cat-section h2 a { text-decoration: none; color: var(--navy); }

.cat-section h2 a:hover { color: #000000; }

.latest-list {
  list-style: none;
  margin: 0.5rem 0 0 0;
  padding: 0;
}

.latest-item {
  padding: 1rem 0 1.1rem 0;
  border-top: 1px solid var(--hairline);
}

.latest-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 0.3rem 0;
}

.latest-title a { color: var(--navy); text-decoration: none; }

.latest-title a:hover { color: #000000; text-decoration: underline; text-underline-offset: 3px; }

.latest-title .gilt-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--gilt);
  margin-right: 0.5rem;
}

.latest-meta {
  font-family: 'JetBrains Mono', 'SFMono-Regular', monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate);
  margin: 0 0 0.4rem 0;
}

.latest-desc { color: var(--body); margin: 0; max-width: 52rem; }

.more-row { margin: 1.25rem 0 0 0; }

.more-btn {
  display: inline-block;
  background: var(--navy);
  color: #FFFFFF;
  border: 1px solid var(--navy);
  padding: 10px 22px;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
}

.more-btn:hover { background: var(--ink); color: #FFFFFF; }

@media (max-width: 768px) {
  .toc-list { grid-template-columns: 1fr; }
}