/**
 * Insights, Knowledge Center & Technical Briefings Stylesheet
 * Strict adherence to DESIGN.md and .agents/rules/design-law.md tokens.
 *
 * @package StepInsightSolution
 * @since 1.2.0
 */

/* -------------------------------------------------------------------------
   Global Breadcrumbs Flex Reset (Eliminates default numbered lists)
   ------------------------------------------------------------------------- */
.breadcrumbs-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2xs);
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.breadcrumbs-item {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs-item a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--dur-short) var(--ease-out);
}

.breadcrumbs-item a:hover {
  color: var(--color-accent);
}

.breadcrumbs-separator {
  margin-inline: var(--space-2xs);
  color: var(--color-rule);
}

.breadcrumbs-item.active {
  color: var(--color-ink);
  font-weight: 500;
}

/* -------------------------------------------------------------------------
   1. EDITORIAL HERO MASTHEAD (Dark Forest Surface)
   ------------------------------------------------------------------------- */
.insights-hero {
  position: relative;
  background: linear-gradient(180deg, var(--color-paper-darker) 0%, var(--color-forest) 100%);
  color: var(--color-ink-white);
  padding-top: calc(var(--section-gap) + var(--space-xl));
  padding-bottom: var(--section-gap);
  border-bottom: 1px solid var(--color-forest-border);
  overflow: hidden;
}

.insights-hero .breadcrumbs-nav {
  margin-bottom: var(--space-xl);
}

.insights-hero .breadcrumbs-list {
  color: var(--color-muted-light);
}

.insights-hero .breadcrumbs-item a {
  color: var(--color-muted-light);
}

.insights-hero .breadcrumbs-item a:hover {
  color: var(--color-accent-soft);
}

.insights-hero .breadcrumbs-separator {
  color: var(--color-forest-border);
}

.insights-hero .breadcrumbs-item.active {
  color: var(--color-ink-white);
  font-weight: 600;
}

.insights-hero-content {
  max-width: 900px;
  margin-bottom: var(--space-2xl);
}

.insights-hero-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.insights-hero .section-badge.badge-emerald {
  background-color: var(--color-accent-translucent);
  color: var(--color-accent-soft);
  border: 1px solid var(--color-accent-translucent-border);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 5px 14px;
  border-radius: var(--radius-full);
}

.insights-hero .status-indicator-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #34D399;
  box-shadow: 0 0 8px rgba(52, 211, 153, 0.7);
  display: inline-block;
}

.insights-coord {
  font-size: var(--text-xs);
  color: var(--color-muted-light);
  letter-spacing: 0.06em;
}

.insights-hero-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-ink-white);
  margin-block: var(--space-sm) var(--space-md);
}

.insights-hero-subtitle {
  font-size: var(--text-lead);
  line-height: 1.6;
  color: var(--color-text-translucent);
  max-width: 820px;
  margin: 0;
}

/* -------------------------------------------------------------------------
   Editorial Telemetry Strip (Knowledge Disciplines Ledger)
   ------------------------------------------------------------------------- */
.insights-telemetry-strip {
  background-color: var(--color-forest-surface);
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-xl);
  backdrop-filter: blur(8px);
}

.insights-telemetry-header {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-muted-light);
  font-size: var(--text-xs);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-forest-border);
}

.telemetry-pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #34D399;
  box-shadow: 0 0 6px rgba(52, 211, 153, 0.6);
}

.insights-telemetry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.telemetry-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.telemetry-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 2px;
}

.telemetry-num {
  font-size: var(--text-xs);
  font-weight: 700;
  color: #34D399;
}

.telemetry-tag {
  font-size: 10px;
  color: var(--color-muted-light);
  letter-spacing: 0.05em;
}

.telemetry-title {
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--color-ink-white);
  margin: 0;
}

.telemetry-sub {
  font-size: 11px;
  color: var(--color-muted-light);
  line-height: 1.45;
  margin: 0;
}

/* -------------------------------------------------------------------------
   Insights Knowledge Main Layout (Warm Paper Surface)
   ------------------------------------------------------------------------- */
.insights-knowledge-main {
  background-color: var(--color-paper);
}

/* -------------------------------------------------------------------------
   Topic Taxonomy Navigation Pills
   ------------------------------------------------------------------------- */
.insights-topic-nav {
  position: relative;
  margin-inline: auto;
}

.insights-topic-pills {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.topic-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  min-height: 44px;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  color: var(--color-ink);
  font-size: var(--text-xs);
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: all var(--dur-short) var(--ease-out);
}

.topic-pill:hover {
  border-color: var(--color-accent);
  background-color: var(--color-paper);
  transform: translateY(-1px);
}

.topic-pill.is-active {
  background-color: var(--color-accent) !important;
  border-color: var(--color-accent) !important;
  color: var(--color-accent-ink) !important;
  box-shadow: var(--shadow-card);
}

.topic-pill.is-active span {
  color: var(--color-accent-ink) !important;
}

.topic-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background-color: var(--color-rule-subtle);
  color: var(--color-ink);
  font-size: 11px;
  line-height: 1;
}

.topic-pill.is-active .topic-count {
  background-color: rgba(255, 255, 255, 0.25);
  color: var(--color-accent-ink) !important;
}

/* -------------------------------------------------------------------------
   Search & Filter Workbench Bar
   ------------------------------------------------------------------------- */
.insights-filter-workbench {
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.insights-filter-grid {
  display: grid;
  grid-template-columns: 2fr 1.3fr auto;
  gap: var(--space-md);
  align-items: center;
}

.search-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.search-icon-wrap {
  position: absolute;
  left: 14px;
  display: flex;
  align-items: center;
  pointer-events: none;
  color: var(--color-muted);
}

.filter-search-input {
  width: 100%;
  min-height: 44px;
  padding-left: 42px;
  padding-right: var(--space-md);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-size: var(--text-sm);
  transition: border-color var(--dur-short) var(--ease-out), box-shadow var(--dur-short) var(--ease-out);
}

.filter-search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
  background-color: var(--color-paper-2);
}

.filter-category-select {
  width: 100%;
  min-height: 44px;
  padding-inline: var(--space-md);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-size: var(--text-sm);
  transition: border-color var(--dur-short) var(--ease-out);
  cursor: pointer;
}

.filter-category-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
  background-color: var(--color-paper-2);
}

.filter-actions-field {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.filter-submit-btn {
  min-height: 44px;
  padding: var(--space-xs) var(--space-lg);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background-color var(--dur-short) var(--ease-out);
}

.filter-submit-btn:hover {
  background-color: var(--color-accent-deep);
}

.filter-reset-btn {
  min-height: 44px;
  padding: var(--space-xs) var(--space-md);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-muted);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--dur-short) var(--ease-out);
}

.filter-reset-btn:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
  background-color: var(--color-paper);
}

/* -------------------------------------------------------------------------
   Featured Lead Technical Dossier
   ------------------------------------------------------------------------- */
.insights-lead-section {
  width: 100%;
}

.insight-lead-dossier {
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out);
}

.insight-lead-dossier:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.lead-dossier-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.lead-dossier-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-rule);
}

.lead-tags-group {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.lead-flag-pill {
  background-color: var(--color-accent-soft);
  color: var(--color-accent-deep);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.lead-category-tag {
  background-color: var(--color-paper);
  border: 1px solid var(--color-rule);
  color: var(--color-ink);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.lead-stats-group {
  font-size: var(--text-xs);
  color: var(--color-muted);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.lead-dossier-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-ink);
  margin: 0;
}

.lead-dossier-title a {
  color: var(--color-ink);
  text-decoration: none;
  transition: color var(--dur-short) var(--ease-out);
}

.lead-dossier-title a:hover {
  color: var(--color-accent);
}

.lead-dossier-excerpt {
  font-size: var(--text-base);
  color: var(--color-muted);
  line-height: 1.6;
  max-width: 860px;
}

.lead-dossier-excerpt p {
  margin: 0;
}

.lead-dossier-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-rule-subtle);
}

.lead-author-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-xs);
  color: var(--color-muted);
  font-weight: 500;
}

.author-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.lead-cta-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding-inline: var(--space-lg);
  font-weight: 600;
}

/* -------------------------------------------------------------------------
   Editorial Workbench Grid
   ------------------------------------------------------------------------- */
.insights-editorial-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-columns);
}

.insight-editorial-card {
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all var(--dur-short) var(--ease-out);
}

.insight-editorial-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.insight-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-xs);
  margin-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-rule-subtle);
}

.insight-category-tag {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent-deep);
  background-color: var(--color-accent-soft);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.insight-read-time {
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.insight-card-title {
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-ink);
  margin-block: var(--space-xs);
}

.insight-card-title a {
  color: var(--color-ink);
  text-decoration: none;
  transition: color var(--dur-short) var(--ease-out);
}

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

.insight-card-excerpt {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.55;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.insight-card-excerpt p {
  margin: 0;
}

.insight-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-rule-subtle);
  margin-top: auto;
}

.insight-card-author-bar {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.insight-date {
  font-size: 11px;
  color: var(--color-muted);
}

.insight-author-name {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-ink);
}

.insight-read-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent-deep);
  text-decoration: none;
  transition: color var(--dur-short) var(--ease-out);
  padding-inline: var(--space-xs);
}

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

/* -------------------------------------------------------------------------
   Technical Briefing / Newsletter Dispatch Console
   ------------------------------------------------------------------------- */
.insights-briefing-dossier {
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-card);
}

.briefing-callout-grid {
  display: grid;
  grid-template-columns: 2fr 1.3fr;
  gap: var(--space-2xl);
  align-items: center;
}

.briefing-text-block .dossier-headline {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.3;
  margin-bottom: var(--space-xs);
}

.briefing-text-block .dossier-description {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.6;
  margin: 0;
}

.briefing-action-block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-xs);
}

.briefing-cta-btn {
  min-height: 44px;
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  text-align: center;
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background-color var(--dur-short) var(--ease-out);
}

.briefing-cta-btn:hover {
  background-color: var(--color-accent-deep);
}

.briefing-subtext {
  font-size: 11px;
  color: var(--color-muted);
  text-align: center;
  width: 100%;
  margin: 0;
}

/* -------------------------------------------------------------------------
   Responsive Viewport Adaptations
   ------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .insights-telemetry-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .insights-editorial-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .insights-filter-grid {
    grid-template-columns: 1fr 1fr;
  }

  .filter-actions-field {
    grid-column: 1 / -1;
  }

  .briefing-callout-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 768px) {
  .insights-hero {
    padding-top: calc(var(--section-gap-s) + var(--space-xl));
    padding-bottom: var(--section-gap-s);
  }

  .insights-hero-title {
    font-size: var(--text-2xl);
  }

  .insights-telemetry-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .insights-topic-pills {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: var(--space-xs);
    -webkit-overflow-scrolling: touch;
    flex-wrap: nowrap;
    scrollbar-width: thin;
  }

  .topic-pill {
    flex-shrink: 0;
  }

  .insights-filter-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .filter-actions-field {
    width: 100%;
  }

  .filter-submit-btn {
    flex: 1;
  }

  .insights-lead-section .insight-lead-dossier {
    padding: var(--space-lg);
  }

  .lead-dossier-title {
    font-size: var(--text-xl);
  }

  .insights-editorial-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .insight-editorial-card {
    padding: var(--space-lg);
  }

  .insights-briefing-dossier {
    padding: var(--space-lg);
  }
}