/* === Insights Dashboard — Professional Design System === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

:root {
  --bg: #0c0c14;
  --surface: #161622;
  --elevated: #1e1e2e;
  --text: #f0f0f5;
  --text-secondary: #8888a0;
  --text-tertiary: #55556a;
  --accent: #6c63ff;
  --accent-glow: rgba(108, 99, 255, 0.3);
  --green: #34d399;
  --red: #f87171;
  --amber: #fbbf24;
  --blue: #60a5fa;
  --card-bg: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.06);
  --radius: 16px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh;
  padding: 2rem 1.5rem;
  line-height: 1.5;
}

/* === Header === */
.header {
  max-width: 1200px;
  margin: 0 auto 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  color: var(--text);
}

.header a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 1rem;
  border: 1px solid var(--accent);
  border-radius: 50px;
  background: rgba(108, 99, 255, 0.08);
  transition: background 0.2s, box-shadow 0.2s;
}

.header a:hover {
  background: var(--accent-glow);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* === Dashboard Grid === */
.dashboard {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.5rem;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  animation: cardEntrance 0.4s ease-out both;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.full-width { grid-column: span 12; }
.half-width { grid-column: span 6; }
.quarter-width { grid-column: span 3; }

@keyframes cardEntrance {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.card:nth-child(1) { animation-delay: 0ms; }
.card:nth-child(2) { animation-delay: 50ms; }
.card:nth-child(3) { animation-delay: 100ms; }
.card:nth-child(4) { animation-delay: 150ms; }
.card:nth-child(5) { animation-delay: 200ms; }
.card:nth-child(6) { animation-delay: 250ms; }
.card:nth-child(7) { animation-delay: 300ms; }
.card:nth-child(8) { animation-delay: 350ms; }
.card:nth-child(9) { animation-delay: 400ms; }
.card:nth-child(10) { animation-delay: 450ms; }
.card:nth-child(11) { animation-delay: 500ms; }

/* === Section Labels === */
.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: 1rem;
}

.card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
}

/* === 1. Narrative Analysis === */
.narrative-card {
  border-left: 3px solid var(--accent);
}

.narrative-section {
  margin-bottom: 1.25rem;
}

.narrative-section:last-child {
  margin-bottom: 0;
}

.narrative-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.narrative-text {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text);
}

.narrative-callout {
  background: rgba(108, 99, 255, 0.06);
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  padding: 1rem 1.25rem;
  margin-top: 0.75rem;
}

.narrative-callout .narrative-text {
  font-size: 1rem;
  color: var(--text);
}

/* === 2. Stat Cards === */
.stat-card {
  text-align: center;
  padding: 1.25rem 1rem;
}

.stat-card:hover {
  transform: translateY(-2px);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.stat-value.accent { color: var(--accent); }
.stat-value.green { color: var(--green); }
.stat-value.blue { color: var(--blue); }
.stat-value.amber { color: var(--amber); }

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.stat-trend {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 0.25rem;
}

/* === 3. Topic Drift === */
.drift-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.drift-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.drift-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.drift-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  transition: transform 0.15s ease;
}

.drift-tag:hover {
  transform: scale(1.05);
}

.drift-tag.emerging {
  background: rgba(52, 211, 153, 0.12);
  color: var(--green);
  border: 1px solid rgba(52, 211, 153, 0.25);
}

.drift-tag.fading {
  background: rgba(248, 113, 113, 0.12);
  color: var(--red);
  border: 1px solid rgba(248, 113, 113, 0.25);
}

.drift-none {
  color: var(--text-tertiary);
  font-size: 0.85rem;
  font-style: italic;
}

/* Narrative Shifts (semantic drift) */
.semantic-drift-section {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--card-border);
}

.semantic-drift-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.drift-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 0.75rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
}

.drift-item:last-child {
  margin-bottom: 0;
}

.drift-topic-pill {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.7rem;
  border-radius: 12px;
  background: rgba(108, 99, 255, 0.15);
  color: var(--accent);
  white-space: nowrap;
  flex-shrink: 0;
}

.drift-bar-wrap {
  flex: 1;
  min-width: 0;
}

.drift-bar {
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.06);
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.drift-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.6s ease;
}

.drift-bar-fill.low { background: var(--green); }
.drift-bar-fill.medium { background: var(--amber); }
.drift-bar-fill.high { background: var(--red); }

.drift-explanation {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* === 4. Topic Velocity === */
.tab-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.tab-btn {
  padding: 0.4rem 1rem;
  border-radius: 20px;
  border: 1px solid var(--card-border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.tab-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.tab-btn:hover:not(.active) {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.velocity-bars {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.velocity-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.velocity-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text);
  min-width: 120px;
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.velocity-bar-wrap {
  flex: 1;
  height: 20px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 4px;
  overflow: hidden;
}

.velocity-bar {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
  min-width: 2px;
}

.velocity-bar.rising { background: var(--green); }
.velocity-bar.falling { background: var(--red); }
.velocity-bar.stable { background: var(--text-tertiary); }

.velocity-value {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 3.5rem;
  text-align: left;
}

/* === 5. Source Coverage Profile === */
.source-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.source-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.03);
  transition: background 0.15s;
}

.source-row:hover {
  background: rgba(255, 255, 255, 0.05);
}

.source-name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  min-width: 100px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.concentration-bar-wrap {
  flex: 1;
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
}

.concentration-bar {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
}

.concentration-bar.diverse { background: var(--green); }
.concentration-bar.moderate { background: var(--amber); }
.concentration-bar.concentrated { background: var(--red); }

.source-dominant {
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.2rem 0.5rem;
  border-radius: 10px;
  background: rgba(108, 99, 255, 0.12);
  color: var(--accent);
  white-space: nowrap;
}

.source-topic-count {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  white-space: nowrap;
}

/* === 6. Past Briefings (Episodes) === */
.episode-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.episode {
  padding: 0.85rem 1rem;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s;
  border: 1px solid transparent;
}

.episode:hover {
  background: rgba(255, 255, 255, 0.04);
}

.episode-header {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.episode-date {
  font-size: 0.85rem;
  color: var(--text);
  font-weight: 500;
  min-width: 6.5rem;
}

.episode-count {
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-width: 5rem;
}

.episode-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  flex: 1;
}

.topic-pill {
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 500;
  background: rgba(108, 99, 255, 0.12);
  color: var(--accent);
  border: 1px solid rgba(108, 99, 255, 0.15);
}

.episode-chevron {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  transition: transform 0.2s;
  margin-left: auto;
  flex-shrink: 0;
}

.episode.expanded .episode-chevron {
  transform: rotate(90deg);
}

.episode-stories {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.episode.expanded .episode-stories {
  max-height: 2000px;
}

.story-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.5rem 0.6rem 1.5rem;
  transition: background 0.15s;
  border-radius: 6px;
}

.story-row:hover {
  background: rgba(255, 255, 255, 0.03);
}

.story-source-badge {
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-tertiary);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 3rem;
  text-align: center;
}

.story-title {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-decoration: none;
  flex: 1;
  transition: color 0.15s;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.story-coverage {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-tertiary);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.15rem 0.45rem;
  border-radius: 8px;
  white-space: nowrap;
  flex-shrink: 0;
}

/* === 7. Heatmap (Collapsible) === */
.collapsible-header {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.collapsible-header .collapse-icon {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  transition: transform 0.2s;
}

.card.collapsed .collapsible-header .collapse-icon {
  transform: rotate(-90deg);
}

.collapsible-body {
  max-height: 1000px;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.2s ease;
  opacity: 1;
}

.card.collapsed .collapsible-body {
  max-height: 0;
  opacity: 0;
}

.heatmap-wrap {
  overflow-x: auto;
  margin-top: 1rem;
}

.heatmap {
  border-collapse: collapse;
  font-size: 0.75rem;
  width: 100%;
}

.heatmap th, .heatmap td {
  padding: 0.4rem 0.6rem;
  text-align: center;
  white-space: nowrap;
}

.heatmap th {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.7rem;
  position: sticky;
  top: 0;
  background: var(--surface);
}

.heatmap td:first-child {
  text-align: left;
  color: var(--text);
  font-weight: 500;
  position: sticky;
  left: 0;
  background: var(--surface);
}

.heatmap td.cell {
  border-radius: 3px;
  min-width: 2rem;
}

/* === Chart === */
.chart-container {
  position: relative;
  width: 100%;
  height: 350px;
}

/* === Loading / Empty States === */
.loading, .empty {
  text-align: center;
  color: var(--text-tertiary);
  padding: 2rem;
  font-size: 0.85rem;
}

/* Skeleton shimmer */
.skeleton {
  background: linear-gradient(90deg,
    rgba(255,255,255,0.04) 25%,
    rgba(255,255,255,0.08) 50%,
    rgba(255,255,255,0.04) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: 8px;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-line {
  height: 1rem;
  margin-bottom: 0.5rem;
  border-radius: 4px;
}

.skeleton-line:last-child {
  width: 60%;
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.1); border-radius: 3px; }

/* === Responsive === */
@media (max-width: 768px) {
  body { padding: 1rem; }

  .dashboard { gap: 1rem; }

  .full-width,
  .half-width,
  .quarter-width {
    grid-column: span 12;
  }

  /* Stat cards: 2x2 grid */
  .stat-cards-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

  .drift-grid { grid-template-columns: 1fr; }

  .chart-container { height: 250px; }

  .episode-header { flex-wrap: wrap; }

  .velocity-label { min-width: 80px; font-size: 0.75rem; }

  .source-row { flex-wrap: wrap; gap: 0.5rem; }
  .source-name { min-width: unset; flex-basis: 100%; }
}

@media (max-width: 480px) {
  .stat-cards-row {
    grid-template-columns: 1fr;
  }

  .header h1 { font-size: 1.25rem; }

  .tab-bar { flex-wrap: wrap; }
}