:root {
  --bg: #0b0d10;
  --bg-elev: #12151a;
  --bg-elev-2: #171b22;
  --border: #232832;
  --border-strong: #2e3643;
  --text: #e6e8ec;
  --text-dim: #a5adbb;
  --text-muted: #6c7486;
  --accent: #7aa2ff;

  --flag-A: #34d399; /* emerald */
  --flag-T: #60a5fa; /* blue */
  --flag-S: #f59e0b; /* amber */
  --flag-N: #9ca3af; /* gray */

  --flag-A-bg: rgba(52, 211, 153, 0.12);
  --flag-T-bg: rgba(96, 165, 250, 0.12);
  --flag-S-bg: rgba(245, 158, 11, 0.14);
  --flag-N-bg: rgba(156, 163, 175, 0.14);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafbfc;
    --bg-elev: #ffffff;
    --bg-elev-2: #f4f6f9;
    --border: #e5e8ee;
    --border-strong: #d4d9e2;
    --text: #14171c;
    --text-dim: #4a5160;
    --text-muted: #6b7280;
    --accent: #2563eb;

    --flag-A-bg: rgba(16, 129, 93, 0.10);
    --flag-T-bg: rgba(37, 99, 235, 0.10);
    --flag-S-bg: rgba(180, 83, 9, 0.10);
    --flag-N-bg: rgba(107, 114, 128, 0.12);
  }
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

header.page-head {
  margin-bottom: 32px;
}
.eyebrow {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 6px;
}
h1 {
  font-size: 28px;
  font-weight: 650;
  margin: 0 0 8px 0;
  letter-spacing: -0.01em;
}
.subtitle {
  color: var(--text-dim);
  font-size: 15px;
  margin: 0;
  max-width: 780px;
}

section { margin-bottom: 40px; }
h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  color: var(--text-muted);
  font-weight: 600;
  margin: 0 0 14px 0;
}

/* Collapsible: Flag distribution + Per-phase density */
details.task-collapse {
  margin-bottom: 0;
}
details.task-collapse > summary {
  list-style: none;
  cursor: pointer;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  color: var(--text-muted);
  font-weight: 600;
  margin: 0 0 14px 0;
  padding: 6px 8px;
  margin-left: -8px;
  margin-right: -8px;
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
  border-radius: 8px;
  transition: background 0.12s ease, color 0.12s ease;
}
details.task-collapse:not([open]) > summary {
  margin-bottom: 0;
}
details.task-collapse > summary:hover {
  color: var(--text-dim);
  background: var(--bg-elev-2);
}
details.task-collapse > summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
details.task-collapse > summary::-webkit-details-marker {
  display: none;
}
details.task-collapse > summary .collapse-chevron {
  flex-shrink: 0;
  display: flex;
  color: var(--text-muted);
  transition: transform 0.15s ease;
}
details.task-collapse[open] > summary .collapse-chevron {
  transform: rotate(90deg);
}
details.task-collapse > summary .collapse-hint {
  margin-left: auto;
  font-size: 11px;
  font-weight: 550;
  text-transform: none;
  letter-spacing: normal;
  color: var(--accent);
}
details.task-collapse > summary .collapse-hint .when-open {
  display: none;
}
details.task-collapse[open] > summary .collapse-hint .when-closed {
  display: none;
}
details.task-collapse[open] > summary .collapse-hint .when-open {
  display: inline;
}

/* Flag cards */
.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
@media (max-width: 760px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.flag-badge {
  font-weight: 700;
  font-size: 14px;
  width: 28px; height: 28px;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.flag-bg-A { background: var(--flag-A-bg); color: var(--flag-A); }
.flag-bg-T { background: var(--flag-T-bg); color: var(--flag-T); }
.flag-bg-S { background: var(--flag-S-bg); color: var(--flag-S); }
.flag-bg-N { background: var(--flag-N-bg); color: var(--flag-N); }

.card-body { flex: 1; min-width: 0; }
.card-label { font-weight: 600; font-size: 14px; }
.card-tag { color: var(--text-muted); font-size: 12px; margin-top: 2px; }
.card-numbers {
  display: flex; align-items: baseline; gap: 8px; margin-top: 8px;
}
.card-count { font-size: 22px; font-weight: 650; letter-spacing: -0.01em; }
.card-pct { color: var(--text-muted); font-size: 12px; }

/* Per-phase table */
.table-wrap {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
table.density {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
table.density th, table.density td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
table.density thead th {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--bg-elev-2);
}
table.density tbody tr:last-child td { border-bottom: none; }
table.density td.num, table.density th.num { text-align: right; width: 48px; }
table.density td.total { font-weight: 600; }
table.density .phase-name { font-weight: 550; }
.phase-num {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  display: inline-block;
  min-width: 2.4em;
  font-weight: 500;
}
.phase-title .phase-num { margin-right: 0.1em; }
table.density .bar-cell { width: 220px; }
.bar {
  display: flex;
  height: 8px;
  width: 100%;
  border-radius: 4px;
  overflow: hidden;
  background: var(--bg-elev-2);
}
.bar-seg { height: 100%; }
.bar-bg-A { background: var(--flag-A); }
.bar-bg-T { background: var(--flag-T); }
.bar-bg-S { background: var(--flag-S); }
.bar-bg-N { background: var(--flag-N); }

/* Toolbar */
.toolbar {
  display: flex; gap: 10px; align-items: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.search {
  flex: 1;
  min-width: 220px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 14px;
  outline: none;
  transition: border-color .12s ease;
}
.search:focus { border-color: var(--accent); }

.filters { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  cursor: pointer;
  user-select: none;
  font-size: 12px;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-dim);
  display: inline-flex; align-items: center; gap: 6px;
  transition: all .12s ease;
}
.chip .dot {
  width: 8px; height: 8px; border-radius: 50%;
}
.chip.active { color: var(--text); border-color: var(--border-strong); background: var(--bg-elev-2); }
.chip.A.active { border-color: var(--flag-A); }
.chip.T.active { border-color: var(--flag-T); }
.chip.S.active { border-color: var(--flag-S); }
.chip.N.active { border-color: var(--flag-N); }
.chip .dot.A { background: var(--flag-A); }
.chip .dot.T { background: var(--flag-T); }
.chip .dot.S { background: var(--flag-S); }
.chip .dot.N { background: var(--flag-N); }

.phase-select {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 10px;
  font-size: 13px;
  outline: none;
}
.count-pill {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 999px;
}

/* Phase groups */
.phase-group { margin-top: 24px; }
.phase-head {
  display: flex; align-items: baseline; gap: 10px;
  padding: 10px 0 10px;
  border-bottom: 1px solid var(--border-strong);
  margin-bottom: 4px;
}
.phase-title {
  font-size: 14px; font-weight: 650; letter-spacing: -0.005em;
}
.phase-count { color: var(--text-muted); font-size: 12px; }

.task {
  display: grid;
  grid-template-columns: 44px 44px 1fr;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.task:last-child { border-bottom: none; }
.task-num {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  padding-top: 2px;
}
.task-flag {
  font-weight: 700; font-size: 11px;
  width: 28px; height: 22px;
  border-radius: 5px;
  display: inline-flex; align-items: center; justify-content: center;
  margin-top: 0;
  position: relative;
}
.task-flag--changed { width: 34px; }
.task-flag__star {
  font-weight: 700;
  font-size: 11px;
  line-height: 1;
  margin-left: 2px;
  color: var(--flag-S);
  letter-spacing: 0;
}
.task-body { min-width: 0; }
.task-title {
  font-size: 14px; font-weight: 550; margin: 0 0 4px 0;
  color: var(--text);
}
.task-desc {
  color: var(--text-dim);
  font-size: 13px;
  margin: 0;
}

.empty {
  padding: 40px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}

mark {
  background: rgba(250, 204, 21, 0.28);
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
}

/* Page switcher */
.page-nav {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}
.page-nav a {
  color: var(--text-dim);
  text-decoration: none;
  font: inherit;
  font-size: 13px;
  font-weight: 550;
  padding: 10px 14px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color .12s ease, border-color .12s ease;
}
.page-nav a:hover { color: var(--text); }
.page-nav a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* Flow page */
:root {
  --sev-info: #60a5fa;
  --sev-warn: #f59e0b;
  --sev-crit: #ef4444;
  --sev-info-bg: rgba(96, 165, 250, 0.15);
  --sev-warn-bg: rgba(245, 158, 11, 0.15);
  --sev-crit-bg: rgba(239, 68, 68, 0.15);
  --sev-info-border: rgba(96, 165, 250, 0.35);
  --sev-warn-border: rgba(245, 158, 11, 0.35);
  --sev-crit-border: rgba(239, 68, 68, 0.35);
}
@media (prefers-color-scheme: light) {
  :root {
    --sev-info: #2563eb;
    --sev-warn: #b45309;
    --sev-crit: #b91c1c;
    --sev-info-bg: rgba(37, 99, 235, 0.1);
    --sev-warn-bg: rgba(180, 83, 9, 0.12);
    --sev-crit-bg: rgba(185, 28, 28, 0.1);
    --sev-info-border: rgba(37, 99, 235, 0.35);
    --sev-warn-border: rgba(180, 83, 9, 0.4);
    --sev-crit-border: rgba(185, 28, 28, 0.35);
  }
}

.flow-intro {
  color: var(--text-dim);
  font-size: 14px;
  max-width: 780px;
  margin: 0 0 20px 0;
}
.flow-frame {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  overflow-x: auto;
}
.flow-frame .mermaid {
  display: flex;
  justify-content: center;
  min-width: 0;
}

/* Per-phase block on the Flow page: head + canvas + legend + notes.
   Multiple of these stack vertically, one per phase module. */
.phase-flow + .phase-flow {
  margin-top: 56px;
}

.flow-canvas {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  height: min(78vh, 900px);
  min-height: 620px;
  overflow: hidden;
  margin-top: 8px;
}

.flow-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-dim);
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.legend-swatch {
  width: 22px;
  height: 3px;
  border-radius: 2px;
}
.legend-swatch.sev-info-sw { background: var(--sev-info); }
.legend-swatch.sev-warn-sw { background: var(--sev-warn); }
.legend-swatch.sev-crit-sw { background: var(--sev-crit); }
.legend-swatch.target-sw {
  background: var(--accent);
  opacity: 0.55;
}

.task-node {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  width: 520px;
  box-sizing: border-box;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 13px;
}
.task-node.is-target {
  background: var(--flag-T-bg);
  border-color: var(--sev-info-border);
  box-shadow: inset 3px 0 0 0 var(--accent);
}
.task-badge {
  flex-shrink: 0;
  width: 32px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.task-node .task-title {
  flex: 1;
  line-height: 1.3;
  font-size: 13px;
  font-weight: 500;
  margin: 0;
}
.task-chip {
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
  flex-shrink: 0;
}
.task-pills {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex-shrink: 0;
}
.pill {
  position: relative;
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 500;
  line-height: 1.15;
  white-space: nowrap;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  min-width: 92px;
}
.pill-route {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10px;
  letter-spacing: 0.02em;
  opacity: 0.85;
}
.pill-label {
  font-size: 10px;
}
.sev-info {
  background: var(--sev-info-bg);
  color: var(--sev-info);
  border: 1px solid var(--sev-info-border);
}
.sev-warn {
  background: var(--sev-warn-bg);
  color: var(--sev-warn);
  border: 1px solid var(--sev-warn-border);
}
.sev-crit {
  background: var(--sev-crit-bg);
  color: var(--sev-crit);
  border: 1px solid var(--sev-crit-border);
}

/* React Flow theme overrides so the canvas matches styles.css dark/light */
.react-flow__background {
  background: var(--bg-elev);
}
.react-flow__handle {
  width: 1px;
  height: 1px;
  min-width: 1px;
  min-height: 1px;
  background: transparent;
  border: 0;
  opacity: 0;
  pointer-events: none;
}
.react-flow__attribution {
  display: none;
}
.react-flow__controls {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: none;
  overflow: hidden;
}
.react-flow__controls-button {
  background: var(--bg-elev-2);
  color: var(--text-dim);
  border: 0;
  border-bottom: 1px solid var(--border);
  width: 28px;
  height: 28px;
}
.react-flow__controls-button:last-child {
  border-bottom: 0;
}
.react-flow__controls-button:hover {
  background: var(--bg-elev);
  color: var(--text);
}
.react-flow__controls-button svg {
  fill: currentColor;
}

.flow-loading {
  padding: 24px;
  color: var(--text-muted);
  font-size: 13px;
}

.flow-loops { margin-top: 28px; }
.flow-loops h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  color: var(--text-muted);
  font-weight: 600;
  margin: 0 0 12px 0;
}
.flow-loops ul {
  color: var(--text-dim);
  margin: 0;
  padding-left: 20px;
  font-size: 13px;
}
.flow-loops li { margin-bottom: 10px; line-height: 1.55; }
.flow-loops-empty {
  color: var(--text-muted);
  font-size: 13px;
  font-style: italic;
  margin: 0;
}
.flow-loops code {
  background: var(--bg-elev-2);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 12px;
  color: var(--text);
}

/* Overview cards (index.html) */
.overview-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
@media (max-width: 760px) {
  .overview-cards { grid-template-columns: 1fr; }
}
.overview-card {
  display: block;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
  text-decoration: none;
  color: inherit;
  transition: border-color .12s ease, background .12s ease, transform .12s ease;
}
.overview-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-elev-2);
}
.overview-card .card-label {
  font-size: 16px;
  margin-bottom: 4px;
}
.overview-card .card-tag {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 0;
}
.overview-card .card-arrow {
  color: var(--accent);
  font-size: 12px;
  margin-top: 12px;
  font-weight: 600;
}