/* Palette: validated with dataviz/validate_palette.js (see README).
   Causal layers use one ordinal blue ramp (5 steps, upstream -> harm);
   incident domains use categorical slots orange / aqua, all-pairs safe
   against every ramp step. Dark values are their own validated steps. */
:root {
  color-scheme: light;
  --page:        #f9f9f7;
  --surface:     #fcfcfb;
  --raised:      #ffffff;
  --ink:         #0b0b0b;
  --ink-2:       #52514e;
  --muted:       #898781;
  --grid:        #e1e0d9;
  --axis:        #c3c2b7;
  --ring:        rgba(11,11,11,0.10);
  --accent:      #2a78d6;
  --accent-ink:  #ffffff;
  --plant:       #eb6834;
  --ship:        #1baf7a;
  --l1: #86b6ef; --l2: #5598e7; --l3: #2a78d6; --l4: #1c5cab; --l5: #0d366b;
  --edge-inst:   #c3c2b7;
  --warn-bg:     #fff6e0;
  --warn-ink:    #6b4a00;
  --err-bg:      #fdecec;
  --err-ink:     #8a1f1f;
  --code-bg:     #f2f1ed;
  --radius: 10px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #0d0d0d; --surface: #1a1a19; --raised: #222220;
    --ink: #f0efec; --ink-2: #c3c2b7; --muted: #898781;
    --grid: #2c2c2a; --axis: #383835; --ring: rgba(255,255,255,0.10);
    --accent: #3987e5; --accent-ink: #0b0b0b;
    --plant: #d95926; --ship: #199e70;
    --l1: #184f95; --l2: #2a78d6; --l3: #5598e7; --l4: #9ec5f4; --l5: #cde2fb;
    --edge-inst: #4a4a46;
    --warn-bg: #2b2412; --warn-ink: #f3d68b; --err-bg: #2d1717; --err-ink: #f2b3b3;
    --code-bg: #141413;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d; --surface: #1a1a19; --raised: #222220;
  --ink: #f0efec; --ink-2: #c3c2b7; --muted: #898781;
  --grid: #2c2c2a; --axis: #383835; --ring: rgba(255,255,255,0.10);
  --accent: #3987e5; --accent-ink: #0b0b0b;
  --plant: #d95926; --ship: #199e70;
  --l1: #184f95; --l2: #2a78d6; --l3: #5598e7; --l4: #9ec5f4; --l5: #cde2fb;
  --edge-inst: #4a4a46;
  --warn-bg: #2b2412; --warn-ink: #f3d68b; --err-bg: #2d1717; --err-ink: #f2b3b3;
  --code-bg: #141413;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; background: var(--page); color: var(--ink); }
body { font-size: 15px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
.page { max-width: 1320px; margin: 0 auto; padding: 28px 24px 40px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.muted { color: var(--muted); }
.small { font-size: 13px; }
a { color: var(--accent); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92em; }

/* ---------- masthead ---------- */
.title-row { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; }
h1 { font-size: 30px; line-height: 1.15; margin: 0 0 8px; letter-spacing: -0.01em; }
.lede { margin: 0; max-width: 78ch; color: var(--ink-2); }
.stats { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; margin: 20px 0 0; }
.stats div { background: var(--surface); border: 1px solid var(--ring); border-radius: var(--radius); padding: 10px 14px; }
.stats dt { font-size: 12px; color: var(--ink-2); }
.stats dd { margin: 2px 0 0; font-size: 22px; font-weight: 650; }

/* ---------- buttons ---------- */
button { font: inherit; cursor: pointer; border-radius: 8px; }
.primary { background: var(--accent); color: var(--accent-ink); border: 0; padding: 9px 22px; font-weight: 600; }
.primary:disabled { opacity: 0.55; cursor: progress; }
.ghost { background: transparent; color: var(--ink-2); border: 1px solid var(--ring); padding: 6px 12px; }
.ghost:hover { background: var(--surface); color: var(--ink); }
.ghost.small, .small.ghost { padding: 4px 10px; font-size: 13px; }
#theme-toggle { font-size: 18px; line-height: 1; padding: 6px 10px; }
button:focus-visible, textarea:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- ask ---------- */
.ask { margin-top: 26px; }
#ask-form { background: var(--surface); border: 1px solid var(--ring); border-radius: var(--radius); padding: 12px; }
textarea { width: 100%; resize: vertical; min-height: 56px; border: 0; background: transparent; color: var(--ink); font: inherit; font-size: 16px; padding: 4px 6px; }
textarea:focus { outline: none; }
.ask-actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 6px; }
.hint { font-size: 13px; color: var(--muted); }
.examples { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 24px; margin-top: 14px; }
.ex-group { display: flex; flex-direction: column; gap: 6px; }
.ex-title { font-size: 12px; color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.04em; }
.ex-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { background: var(--surface); border: 1px solid var(--ring); color: var(--ink); padding: 6px 12px; border-radius: 999px; font-size: 13.5px; }
.chip:hover { border-color: var(--accent); }
.chip.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }

/* ---------- result ---------- */
.result { margin-top: 22px; }
.status { padding: 10px 14px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--ring); color: var(--ink-2); margin-bottom: 12px; }
.status.error { background: var(--err-bg); color: var(--err-ink); border-color: transparent; }
.status.loading::before { content: ""; display: inline-block; width: 12px; height: 12px; margin-right: 10px; border: 2px solid var(--axis); border-top-color: var(--accent); border-radius: 50%; vertical-align: -1px; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.answer { margin-bottom: 12px; }
.summary { margin: 10px 0 8px; padding: 14px 18px 12px; background: var(--surface); border: 1px solid var(--ring); border-left: 4px solid var(--accent); border-radius: var(--radius); }
.summary-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.summary-label { font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--accent); }
.summary-src { font-size: 12px; color: var(--muted); }
.summary-answer { margin: 0; font-size: 17px; line-height: 1.5; font-weight: 500; max-width: 110ch; }
.findings { margin: 10px 0 0; padding: 0; list-style: none; display: grid; gap: 4px; }
.findings li { position: relative; padding: 5px 10px 5px 26px; border-radius: 8px; color: var(--ink); font-size: 14.5px; max-width: 110ch; }
.findings li::before { content: ""; position: absolute; left: 10px; top: 13px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.findings li.linked { cursor: pointer; }
.findings li.linked:hover, .findings li.linked:focus-visible, .findings li.on { background: var(--page); outline: none; }
.findings .show { font-size: 12px; color: var(--accent); margin-left: 6px; white-space: nowrap; }
.summary-caveat { margin: 10px 0 0; font-size: 13px; color: var(--ink-2); }
.summary-caveat:empty { display: none; }
.summary-caveat::before { content: "Caveat · "; font-weight: 600; }
.summary-error { margin: 8px 0 0; font-size: 13px; color: var(--err-ink); }
.summary-loading { display: grid; gap: 8px; padding: 4px 0 2px; }
.summary-loading .bar { display: block; height: 12px; width: 92%; border-radius: 6px; background: linear-gradient(90deg, var(--grid), var(--page), var(--grid)); background-size: 200% 100%; animation: shimmer 1.3s linear infinite; }
.summary-loading .bar.short { width: 64%; }
.summary-wait { font-size: 13px; color: var(--muted); }
@keyframes shimmer { to { background-position: -200% 0; } }
.explanation::before { content: "How this was answered · "; color: var(--muted); }
.interpreted { margin: 0; font-weight: 650; font-size: 19px; line-height: 1.35; }
.explanation { margin: 6px 0 0; color: var(--ink-2); max-width: 110ch; font-size: 14px; }
.notice { margin: 8px 0 0; padding: 8px 12px; border-radius: 8px; background: var(--warn-bg); color: var(--warn-ink); font-size: 14px; }

.tabs { display: flex; align-items: center; gap: 4px; border-bottom: 1px solid var(--grid); }
.tabs [role="tab"] { background: none; border: 0; border-bottom: 2px solid transparent; border-radius: 0; padding: 8px 14px; color: var(--ink-2); }
.tabs [role="tab"][aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); font-weight: 600; }
.tab-meta { margin-left: auto; font-size: 12.5px; color: var(--muted); }

.panel { margin-top: 12px; }
#panel-graph:not([hidden]) { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 12px; }
.graph-wrap { position: relative; background: var(--surface); border: 1px solid var(--ring); border-radius: var(--radius); overflow: hidden; }
.graph { height: 640px; }
.graph-toolbar { position: absolute; top: 10px; left: 10px; z-index: 2; display: flex; gap: 8px; }
.seg { display: inline-flex; border: 1px solid var(--ring); border-radius: 8px; overflow: hidden; background: var(--raised); }
.seg button { border: 0; border-radius: 0; background: transparent; color: var(--ink-2); padding: 4px 12px; font-size: 13px; }
.seg button.on { background: var(--accent); color: var(--accent-ink); }
.graph-toolbar .ghost { background: var(--raised); }
.graph-empty { position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted); }

.details { background: var(--surface); border: 1px solid var(--ring); border-radius: var(--radius); padding: 14px 16px; max-height: 640px; overflow: auto; font-size: 14px; }
.details h4 { margin: 0 0 2px; font-size: 16px; line-height: 1.3; }
.details .kind { font-size: 12px; color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 10px; display: flex; align-items: center; gap: 6px; }
.details dl { display: grid; grid-template-columns: max-content 1fr; gap: 3px 12px; margin: 10px 0; }
.details dt { color: var(--muted); }
.details dd { margin: 0; overflow-wrap: anywhere; }
.details blockquote { margin: 8px 0; padding: 6px 10px; border-left: 3px solid var(--axis); color: var(--ink-2); background: var(--page); border-radius: 0 6px 6px 0; }
.details .tag { display: inline-block; font-size: 11px; padding: 1px 6px; border-radius: 999px; border: 1px solid var(--ring); color: var(--ink-2); }
.details .orig { font-size: 12.5px; color: var(--muted); }
.details .orig summary { cursor: pointer; }
.dot-sw { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }

.table-wrap { overflow: auto; max-height: 680px; background: var(--surface); border: 1px solid var(--ring); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 7px 12px; border-bottom: 1px solid var(--grid); vertical-align: top; }
th { position: sticky; top: 0; background: var(--raised); color: var(--ink-2); font-weight: 600; z-index: 1; }
td.num { text-align: right; }

.cypher-wrap { position: relative; background: var(--code-bg); border: 1px solid var(--ring); border-radius: var(--radius); padding: 14px 16px; }
.cypher-wrap pre { margin: 0; overflow: auto; white-space: pre-wrap; }
.cypher-wrap .copy { position: absolute; top: 10px; right: 10px; background: var(--raised); }

/* ---------- legend ---------- */
.legend { display: flex; flex-wrap: wrap; gap: 14px 28px; margin-top: 14px; padding: 12px 16px; background: var(--surface); border: 1px solid var(--ring); border-radius: var(--radius); font-size: 13px; color: var(--ink-2); }
.legend-group { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; }
.legend-title { color: var(--ink); font-weight: 600; width: 100%; font-size: 12.5px; }
.key { display: inline-flex; align-items: center; gap: 6px; }
.sw { display: inline-block; width: 14px; height: 14px; }
.sw.box { width: 18px; height: 12px; border-radius: 3px; border: 2.5px solid; background: var(--surface); }
.sw.box.plant { border-color: var(--plant); } .sw.box.ship { border-color: var(--ship); }
.sw.l1 { background: var(--l1); } .sw.l2 { background: var(--l2); } .sw.l3 { background: var(--l3); }
.sw.l4 { background: var(--l4); } .sw.l5 { background: var(--l5); }
.sw.dot { border-radius: 50%; }
.sw.sq { border-radius: 2px; width: 12px; height: 12px; }
.sw.hex { clip-path: polygon(25% 5%, 75% 5%, 100% 50%, 75% 95%, 25% 95%, 0 50%); }
.sw.tri { clip-path: polygon(50% 5%, 100% 95%, 0 95%); }
.sw.tridown { clip-path: polygon(0 5%, 100% 5%, 50% 95%); }
.sw.dia { clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%); }
.sw.ring { border-radius: 50%; border: 2px solid var(--muted); background: var(--surface); width: 13px; height: 13px; }
.sw.ctx { border: 2px solid var(--muted); background: var(--surface); }
.ln { display: inline-block; width: 26px; height: 0; border-top: 2.5px solid; }
.ln.both { border-color: var(--ink); } .ln.plant { border-color: var(--plant); }
.ln.ship { border-color: var(--ship); } .ln.inst { border-color: var(--edge-inst); border-top-width: 1.5px; }

/* ---------- about ---------- */
.about { margin-top: 26px; }
.about details { background: var(--surface); border: 1px solid var(--ring); border-radius: var(--radius); padding: 12px 16px; }
.about summary { cursor: pointer; font-weight: 600; }
.about-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 28px; margin-top: 8px; }
.about h3 { font-size: 15px; margin: 14px 0 4px; }
.about p, .about li { color: var(--ink-2); font-size: 14px; }
.about ul { padding-left: 18px; margin: 4px 0; }
.foot { margin-top: 26px; font-size: 12.5px; color: var(--muted); text-align: center; }

/* vis-network tooltip */
div.vis-tooltip { background: var(--raised) !important; color: var(--ink) !important; border: 1px solid var(--ring) !important; border-radius: 8px !important; font-family: inherit !important; font-size: 13px !important; padding: 6px 10px !important; max-width: 340px; white-space: normal !important; box-shadow: 0 4px 16px rgba(0,0,0,0.12) !important; }

@media (max-width: 980px) {
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .examples { grid-template-columns: 1fr; }
  #panel-graph:not([hidden]) { grid-template-columns: 1fr; }
  .graph { height: 520px; }
  .details { max-height: none; }
  .about-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .page { padding: 18px 14px 30px; }
  h1 { font-size: 24px; }
  .stats dd { font-size: 19px; }
  .tab-meta { display: none; }
}