/* ===================================================================
   VOLTA SOVEREIGN — briefings.css
   -------------------------------------------------------------------
   Intelligence Briefings publishing engine styles.
   Strictly references custom properties declared in aurum.css and
   style.css. Contains zero hex/rgba color literals.
   =================================================================== */

/* ── Index Page Layout ── */
.briefings-hero {
  padding-top: 15vh;
  padding-bottom: 60px;
  position: relative;
  text-align: center;
}

.briefings-hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--cream);
  max-width: 960px;
  margin: 0 auto 24px;
}

.briefings-hero-lede {
  font-size: 1.12rem;
  line-height: 1.6;
  color: var(--cream-dim);
  max-width: 720px;
  margin: 0 auto;
}

.briefings-section {
  padding: 40px 24px 120px;
  max-width: 1100px;
  margin: 0 auto;
}

.briefings-grid {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.briefing-card {
  display: block;
  background: var(--black-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 36px 40px;
  text-decoration: none;
  transition: transform var(--motion-fade-duration) var(--motion-ease),
              border-color var(--motion-fade-duration) var(--motion-ease),
              background var(--motion-fade-duration) var(--motion-ease),
              box-shadow var(--motion-fade-duration) var(--motion-ease);
}

.briefing-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: var(--black-3);
  box-shadow: var(--shadow-md);
}

.briefing-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-bottom: 18px;
}

.briefing-card-id {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.briefing-card-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray);
  border: 1px solid var(--border-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.briefing-card-date,
.briefing-card-readtime {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gray);
}

.briefing-card-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gold-dim);
  background: var(--accent-muted);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-left: auto;
}

.briefing-card-title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.8vw, 1.95rem);
  font-weight: 400;
  line-height: 1.25;
  color: var(--cream);
  margin-bottom: 14px;
  letter-spacing: -0.005em;
  transition: color var(--motion-fade-duration) var(--motion-ease);
}

.briefing-card:hover .briefing-card-title {
  color: var(--accent-hover);
}

.briefing-card-summary {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--cream-dim);
  margin-bottom: 22px;
  max-width: 900px;
}

.briefing-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
  margin-top: 10px;
}

.briefing-card-action {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.briefing-card-action .arrow {
  transition: transform var(--motion-fade-duration) var(--motion-ease);
}

.briefing-card:hover .briefing-card-action .arrow {
  transform: translateX(4px);
}

/* ── Article Template Layout ── */
.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 140px 24px 100px;
  position: relative;
}

.briefing-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 36px;
  transition: color var(--motion-fade-duration) var(--motion-ease);
}

.briefing-back-link:hover {
  color: var(--gold);
}

/* ── Structured Top Metadata Bar ── */
.briefing-metadata-bar {
  background: var(--black-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.metadata-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metadata-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
}

.metadata-value {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--cream);
}

.metadata-value.accent {
  color: var(--gold);
}

.metadata-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream);
}

/* ── Article Header ── */
.article-header {
  margin-bottom: 40px;
}

.article-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 18px;
}

.article-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--cream);
  margin-bottom: 20px;
}

.article-subtitle {
  font-size: 1.22rem;
  line-height: 1.55;
  color: var(--cream-dim);
  margin-bottom: 32px;
}

/* ── Executive Summary Callout Box ── */
.briefing-exec-summary {
  background: var(--black-2);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius-sm);
  padding: 26px 30px;
  margin: 36px 0 48px;
}

.exec-summary-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}

.briefing-exec-summary p {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--cream);
  margin: 0;
}

/* ── Article Content Typography ── */
.article-content {
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--cream-dim);
}

.article-content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.3rem);
  font-weight: 400;
  line-height: 1.25;
  color: var(--cream);
  margin-top: 54px;
  margin-bottom: 22px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content h3 {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.4vw, 1.65rem);
  font-weight: 400;
  line-height: 1.35;
  color: var(--cream);
  margin-top: 38px;
  margin-bottom: 16px;
}

.article-content h4 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--cream);
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-content p {
  margin-bottom: 26px;
}

.article-content strong {
  color: var(--cream);
  font-weight: 600;
}

.article-content em {
  font-style: italic;
  color: var(--cream);
}

.article-content a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--motion-fade-duration) var(--motion-ease);
}

.article-content a:hover {
  color: var(--accent-hover);
}

.article-content ul,
.article-content ol {
  margin: 0 0 28px 26px;
  padding: 0;
}

.article-content li {
  margin-bottom: 10px;
  line-height: 1.7;
}

.article-content li::marker {
  color: var(--gold-dim);
}

.article-content hr {
  border: none;
  height: 1px;
  background: var(--border-subtle);
  margin: 48px 0;
}

/* ── Blockquotes ── */
.article-content blockquote {
  background: var(--black-2);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 26px 32px;
  margin: 40px 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-style: italic;
  line-height: 1.6;
  color: var(--cream);
}

.article-content blockquote p {
  margin-bottom: 10px;
}

.article-content blockquote p:last-child {
  margin-bottom: 0;
}

/* ── Architectural Callout Boxes ── */
.architectural-callout {
  background: var(--black-2);
  border: 1px solid var(--border-subtle);
  border-top: 2px solid var(--gold);
  border-radius: var(--radius-sm);
  padding: 26px 30px;
  margin: 40px 0;
  box-shadow: var(--shadow-sm);
}

.callout-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}

.callout-badge {
  background: var(--accent-muted);
  color: var(--gold);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  font-size: 10px;
  font-weight: 600;
}

.callout-title {
  color: var(--cream);
  font-weight: 500;
}

.callout-body {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--cream-dim);
}

.callout-body p:last-child {
  margin-bottom: 0;
}

/* ── Technical Pre & Code ── */
.article-content pre {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  background: var(--black-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 22px 26px;
  overflow-x: auto;
  color: var(--cream);
  margin: 36px 0;
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--black-3);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  color: var(--cream);
}

.article-content pre code {
  background: transparent;
  padding: 0;
  border: none;
  font-size: inherit;
}

/* ── Tables ── */
.table-container {
  width: 100%;
  overflow-x: auto;
  margin: 40px 0;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--black-2);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
}

.article-content th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  padding: 16px 20px;
  background: var(--black-3);
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.article-content td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--cream-dim);
  line-height: 1.55;
}

.article-content tr:last-child td {
  border-bottom: none;
}

.article-content tbody tr {
  transition: background var(--motion-fade-duration) var(--motion-ease);
}

.article-content tbody tr:hover {
  background: var(--black-3);
}

/* ── Ecosystem & Cited Authorities Footer Block ── */
.authorities-block {
  margin-top: 72px;
  padding-top: 48px;
  border-top: 1px solid var(--border-subtle);
}

.authorities-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}

.authorities-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 400;
  color: var(--cream);
  margin-bottom: 12px;
}

.authorities-lede {
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--gray);
  max-width: 720px;
  margin-bottom: 28px;
}

.authorities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
}

.authority-card {
  background: var(--black-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--motion-fade-duration) var(--motion-ease),
              background var(--motion-fade-duration) var(--motion-ease);
}

.authority-card:hover {
  border-color: var(--border-strong);
  background: var(--black-3);
}

.authority-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--cream);
  margin-bottom: 8px;
}

.authority-role {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--gray);
  margin-bottom: 18px;
  flex-grow: 1;
}

.authority-link {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none !important;
  transition: color var(--motion-fade-duration) var(--motion-ease);
}

.authority-link:hover {
  color: var(--accent-hover);
}

/* ── Subtle, High-Prestige CTA Block ── */
.briefing-prestige-cta {
  margin-top: 72px;
  padding: 56px 40px;
  background: var(--black-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.briefing-prestige-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20%;
  right: 20%;
  height: 1px;
  background: var(--accent-gradient);
}

.prestige-cta-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 18px;
}

.prestige-cta-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 400;
  font-style: italic;
  color: var(--cream);
  margin-bottom: 18px;
  letter-spacing: -0.01em;
}

.prestige-cta-body {
  font-size: 1.02rem;
  line-height: 1.65;
  color: var(--cream-dim);
  max-width: 640px;
  margin: 0 auto 34px;
}

.prestige-cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* Responsive Tightening */
@media (max-width: 768px) {
  .briefing-card {
    padding: 26px 22px;
  }
  .briefing-card-tag {
    margin-left: 0;
    width: 100%;
  }
  .briefing-metadata-bar {
    grid-template-columns: repeat(2, 1fr);
    padding: 18px;
  }
  .briefing-exec-summary {
    padding: 20px 22px;
  }
  .article-container {
    padding-top: 110px;
    padding-left: 18px;
    padding-right: 18px;
  }
  .briefing-prestige-cta {
    padding: 40px 24px;
  }
}