:root {
  --bg: #f4f7fb;
  --bg-soft: #f8fbff;
  --panel: #ffffff;
  --panel-alt: #f8fafc;
  --border: #d7dee8;
  --border-strong: #a9b6c8;
  --text: #14202e;
  --muted: #5d6a7a;
  --blue: #2359a6;
  --blue-soft: #edf4ff;
  --teal-soft: #eaf8f5;
  --amber-soft: #fff4df;
  --red-soft: #fff0ef;
  --shadow: 0 12px 28px rgba(20, 32, 46, 0.08);
  --radius-lg: 8px;
  --radius-md: 6px;
  --radius-sm: 4px;
  --max-width: 1440px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Aptos", "Segoe UI Variable", "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f6f9fd 0%, #eef3f8 100%);
}

button,
input,
textarea,
select {
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.app-shell {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
  padding: 20px 0 32px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  padding: 24px 28px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,250,252,0.98));
  box-shadow: var(--shadow);
}

.app-header-copy {
  display: grid;
  gap: 10px;
}

.app-kicker,
.card-kicker,
.stage-index {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 600;
}

.app-header h1,
.content-header h2,
.card h3,
.detail-copy h4,
.side-panel h4 {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  letter-spacing: 0;
}

.app-header h1 {
  font-size: 3rem;
  line-height: 0.98;
  max-width: 12ch;
}

.app-header p,
.content-header p,
.card p,
.detail-copy p,
.side-panel p,
.summary-card small,
.nav-item-copy small,
.bullet-list,
.number-list {
  color: var(--muted);
  line-height: 1.65;
}

.app-actions {
  display: flex;
  gap: 10px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
}

.button.primary {
  background: var(--blue);
  color: #ffffff;
}

.button.secondary {
  background: #ffffff;
  border-color: var(--border);
  color: var(--text);
}

.button:disabled {
  opacity: 0.45;
  cursor: default;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.summary-card {
  position: relative;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.summary-card.accent-blue {
  background: linear-gradient(180deg, #ffffff, #edf4ff);
}

.summary-card.accent-teal {
  background: linear-gradient(180deg, #ffffff, #edf8f6);
}

.summary-card.accent-amber {
  background: linear-gradient(180deg, #ffffff, #fff5df);
}

.summary-card.accent-red {
  background: linear-gradient(180deg, #ffffff, #fff0ef);
}

.summary-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: linear-gradient(180deg, #1f6feb, #6fa8ff);
}

.summary-card.accent-teal::before {
  background: linear-gradient(180deg, #1c9f8e, #65d4c5);
}

.summary-card.accent-amber::before {
  background: linear-gradient(180deg, #c98d21, #efbd63);
}

.summary-card.accent-red::before {
  background: linear-gradient(180deg, #d64b4b, #f29d9d);
}

.summary-card span {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
}

.summary-card strong {
  display: block;
  margin: 10px 0 6px;
  font-size: 1.8rem;
}

.mini-bars {
  display: flex;
  gap: 6px;
  margin-top: 14px;
}

.mini-bars span {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: rgba(31, 111, 235, 0.18);
}

.accent-teal .mini-bars span {
  background: rgba(28, 163, 142, 0.18);
}

.accent-amber .mini-bars span {
  background: rgba(201, 141, 33, 0.2);
}

.accent-red .mini-bars span {
  background: rgba(214, 75, 75, 0.18);
}

.mini-bars span:nth-child(1) { width: 45%; }
.mini-bars span:nth-child(2) { width: 72%; }
.mini-bars span:nth-child(3) { width: 58%; }

.layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 20px;
  margin-top: 16px;
}

.sidebar,
.content {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.sidebar {
  padding: 18px;
  align-self: start;
  position: sticky;
  top: 16px;
}

.sidebar-header {
  display: grid;
  gap: 6px;
  margin-bottom: 14px;
}

.stage-nav {
  display: grid;
  gap: 10px;
}

.nav-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  text-align: left;
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--panel-alt);
  color: inherit;
  cursor: pointer;
  transition: border-color 120ms ease, transform 120ms ease, box-shadow 120ms ease;
}

.nav-item.active {
  border-color: #94b6f5;
  background: var(--blue-soft);
}

.nav-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(28, 31, 36, 0.06);
}

.nav-item-index {
  font-size: 0.82rem;
  color: var(--muted);
}

.nav-item-copy {
  display: grid;
  gap: 4px;
}

.nav-item-copy strong {
  display: block;
}

.content {
  padding: 24px;
}

.content-header {
  display: grid;
  gap: 8px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.content-header h2 {
  font-size: 2.4rem;
  line-height: 1;
}

.content-body {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.grid {
  display: grid;
  gap: 18px;
}

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

.grid.align-start {
  align-items: start;
}

.context-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.context-chip {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(255,255,255,0.94), rgba(241,246,252,0.9));
}

.context-chip span {
  display: block;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0;
  color: var(--muted);
}

.context-chip strong {
  display: block;
  margin-top: 8px;
  font-size: 1rem;
}

.card {
  position: relative;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel-alt);
  overflow: hidden;
}

.card h3 {
  margin-top: 8px;
  margin-bottom: 14px;
  font-size: 1.55rem;
}

.card::after {
  content: "";
  position: absolute;
  left: 22px;
  top: 52px;
  width: 74px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(35, 89, 166, 0.92), rgba(32, 150, 132, 0.24));
}

.flow-track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

.flow-step {
  position: relative;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
  min-height: 112px;
}

.flow-step strong {
  display: block;
}

.flow-step span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.5;
}

.flow-step:not(:last-child)::after {
  content: "->";
  position: absolute;
  right: -14px;
  top: 50%;
  transform: translateY(-50%);
  color: #8aa7d8;
  font-size: 1.1rem;
  font-weight: 700;
}

.flow-step::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(31, 111, 235, 0.95), rgba(31, 111, 235, 0.28));
}

.signal-chain {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.signal-node {
  position: relative;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
  min-height: 128px;
  overflow: hidden;
}

.signal-node::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 4px;
  background: linear-gradient(90deg, rgba(31, 111, 235, 0.9), rgba(31, 111, 235, 0.12));
}

.signal-index {
  display: inline-block;
  font-size: 0.76rem;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

.signal-node strong {
  display: block;
  margin-bottom: 8px;
}

.signal-node small {
  display: block;
  color: var(--muted);
  line-height: 1.55;
}

.matrix-table {
  display: grid;
  gap: 10px;
}

.matrix-row {
  display: grid;
  grid-template-columns: 1.4fr repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.matrix-row.matrix-head .matrix-cell {
  background: transparent;
  border-color: transparent;
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.matrix-cell {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
  text-align: center;
  line-height: 1.45;
}

.matrix-cell.matrix-label {
  justify-content: flex-start;
  text-align: left;
  font-weight: 600;
}

.compact-table {
  display: grid;
  gap: 8px;
}

.compact-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px;
}

.compact-head .compact-cell {
  border-color: transparent;
  background: transparent;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: 0.74rem;
  padding-top: 0;
  padding-bottom: 4px;
}

.compact-cell {
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
  line-height: 1.45;
}

.pill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  box-shadow: 0 3px 10px rgba(15, 23, 42, 0.04);
}

.stacked-meter-shell {
  display: grid;
  gap: 14px;
}

.stacked-meter {
  display: flex;
  min-height: 16px;
  overflow: hidden;
  border-radius: 999px;
  background: #ece8df;
}

.stacked-segment {
  display: block;
  min-width: 24px;
}

.stacked-segment.tone-live {
  background: linear-gradient(90deg, #2f6ac0, #5d8fda);
}

.stacked-segment.tone-paused {
  background: linear-gradient(90deg, #bd7d45, #dfb279);
}

.stacked-segment.tone-context {
  background: linear-gradient(90deg, #2a8c7b, #62bfaf);
}

.stacked-segment.tone-curated {
  background: linear-gradient(90deg, #8b6a55, #bb9a86);
}

.stacked-legend {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stacked-legend-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 8px;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
}

.stacked-legend-item strong,
.stacked-legend-item small {
  margin: 0;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  display: inline-block;
}

.legend-dot.tone-live {
  background: #2f6ac0;
}

.legend-dot.tone-paused {
  background: #bd7d45;
}

.legend-dot.tone-context {
  background: #2a8c7b;
}

.legend-dot.tone-curated {
  background: #8b6a55;
}

.bullet-list,
.number-list {
  margin: 0;
  padding-left: 20px;
}

.bullet-list li,
.number-list li {
  margin: 0 0 10px;
}

.stat-grid,
.taxonomy-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.stat-tile,
.taxonomy-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
}

.stat-tile span,
.taxonomy-card span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}

.stat-tile strong,
.taxonomy-card strong {
  display: block;
  margin: 10px 0 6px;
  font-size: 1.4rem;
  line-height: 1.1;
}

.stat-tile small,
.taxonomy-card small {
  display: block;
  color: var(--muted);
  line-height: 1.55;
}

.status-grid,
.scenario-grid,
.thumb-grid,
.meta-grid,
.callout-list {
  display: grid;
  gap: 12px;
}

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

.status-box {
  position: relative;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
  overflow: hidden;
}

.status-box::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(180deg, rgba(31, 111, 235, 0.92), rgba(31, 111, 235, 0.28));
}

.status-box span,
.meta-grid span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}

.status-box strong,
.meta-grid strong {
  display: block;
  margin: 8px 0 6px;
}

.status-box small {
  display: block;
  color: var(--muted);
  line-height: 1.55;
}

.tone-live {
  background: #f3f8ff;
}

.tone-context {
  background: var(--teal-soft);
}

.tone-curated {
  background: var(--amber-soft);
}

.tone-paused {
  background: var(--red-soft);
}

.platform-layout,
.evidence-layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 18px;
}

.platform-list,
.group-list {
  display: grid;
  gap: 10px;
}

.list-button,
.scenario-card,
.thumb-card,
.media-panel {
  text-align: left;
  border: 1px solid var(--border);
  background: #ffffff;
  color: inherit;
  cursor: pointer;
  transition: border-color 120ms ease, transform 120ms ease, box-shadow 120ms ease;
}

.list-button {
  display: grid;
  gap: 4px;
  padding: 14px;
  border-radius: var(--radius-md);
}

.list-button.active,
.scenario-card.active,
.thumb-card.active {
  border-color: #8fb4f0;
  background: var(--blue-soft);
}

.list-button:hover,
.scenario-card:hover,
.thumb-card:hover,
.media-panel:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(28, 31, 36, 0.07);
}

.list-button strong,
.scenario-card strong,
.thumb-card strong,
.media-panel-copy strong {
  display: block;
}

.list-button span,
.scenario-card span,
.thumb-card span,
.media-panel-copy span {
  color: var(--muted);
  line-height: 1.5;
}

.platform-detail,
.evidence-detail {
  display: grid;
  gap: 14px;
}

.media-panel {
  padding: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.media-panel img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.media-panel-copy {
  padding: 14px;
  background: #ffffff;
}

.detail-copy,
.text-block,
.side-panel {
  display: grid;
  gap: 10px;
}

.detail-copy h4,
.side-panel h4 {
  font-size: 1.25rem;
}

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

.thumb-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.thumb-card {
  display: grid;
  gap: 10px;
  padding: 10px;
  border-radius: var(--radius-md);
}

.thumb-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.callout-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.callout {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
  color: var(--text);
  line-height: 1.6;
}

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

.scenario-card {
  display: grid;
  gap: 6px;
  padding: 16px;
  border-radius: var(--radius-md);
}

.scenario-card strong,
.list-button strong,
.thumb-card strong {
  position: relative;
  padding-left: 16px;
}

.scenario-card strong::before,
.list-button strong::before,
.thumb-card strong::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(180deg, #1f6feb, #75a5ff);
}

.section-intro {
  margin: 0 0 14px;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.segmented-button {
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: inherit;
  cursor: pointer;
}

.segmented-button.active {
  border-color: #8fb4f0;
  background: var(--blue-soft);
  color: var(--blue);
}

.segmented-button:hover {
  transform: translateY(-1px);
}

.side-panel {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #ffffff;
}

.code-block {
  margin: 0;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: #fbfcfe;
  overflow: auto;
  color: #233142;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.55;
}

.lightbox {
  width: min(1080px, calc(100% - 32px));
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #ffffff;
  color: var(--text);
}

.lightbox::backdrop {
  background: rgba(15, 23, 42, 0.35);
}

.lightbox-shell {
  padding: 18px;
}

.lightbox-close {
  margin-left: auto;
  margin-bottom: 12px;
}

.lightbox img {
  width: 100%;
  max-height: 72vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  background: #f8fafc;
}

.lightbox-copy {
  padding: 14px 4px 4px;
}

.lightbox-copy strong {
  display: block;
  margin-bottom: 8px;
}

@media (max-width: 1180px) {
  .layout,
  .platform-layout,
  .evidence-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .summary-strip,
  .grid.two-col,
  .context-bar,
  .stat-grid,
  .taxonomy-grid,
  .stacked-legend,
  .status-grid,
  .thumb-grid,
  .callout-list,
  .scenario-grid,
  .flow-track {
    grid-template-columns: 1fr 1fr;
  }

  .matrix-row {
    grid-template-columns: 1.2fr repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .app-shell {
    width: min(calc(100% - 16px), var(--max-width));
  }

  .app-header {
    flex-direction: column;
  }

  .summary-strip,
  .grid.two-col,
  .context-bar,
  .stat-grid,
  .taxonomy-grid,
  .stacked-legend,
  .status-grid,
  .thumb-grid,
  .callout-list,
  .scenario-grid,
  .meta-grid,
  .flow-track {
    grid-template-columns: 1fr;
  }

  .signal-chain {
    grid-template-columns: 1fr;
  }

  .matrix-row,
  .matrix-row.matrix-head {
    grid-template-columns: 1fr;
  }

  .matrix-row.matrix-head {
    display: none;
  }

  .matrix-cell {
    justify-content: flex-start;
    text-align: left;
  }

  .matrix-cell.matrix-label {
    background: var(--blue-soft);
  }

  .content,
  .sidebar,
  .app-header {
    padding: 18px;
  }

  .flow-step:not(:last-child)::after {
    content: "";
  }
}