/* ------------------------------------------------------------ tokens
   Carnegie Mellon palette: Carnegie Red #C41230, Iron Gray #6D6E71,
   Steel Gray #E0E0E0, Scots Rose #EF3A47 (dark-mode red), Gold Thread #FDB515. */
:root {
  color-scheme: light;
  --red: #C41230;
  --page: #f4f4f4;
  --surface: #ffffff;
  --surface-2: #f2f2f2;
  --ink: #111111;
  --ink-2: #5f6064;
  --muted: #8a8b8e;
  --grid: #e6e6e6;
  --axis: #c6c6c6;
  --border: rgba(0, 0, 0, 0.10);
  --hist: #6D6E71;
  --s1: #C41230;
  --neutral: #8a8b8e;
  --band: rgba(196, 18, 48, 0.14);
  --wash: rgba(0, 0, 0, 0.03);
  --track: #e2e2e2;
  --fail: rgba(0, 0, 0, 0.04);
  --sun: #FDB515;
  --wordmark: #C41230;
  --good: #0ca30c;
  --critical: #d03b3b;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 14px rgba(0, 0, 0, 0.04);
  --tiles: grayscale(1) brightness(1.04) contrast(0.92);
  /* sequential Carnegie Red, low → high */
  --seq-0: #fbe9ec; --seq-1: #f6c9d0; --seq-2: #eea2ae; --seq-3: #e47587; --seq-4: #d84762;
  --seq-5: #C41230; --seq-6: #a30f28; --seq-7: #800b1f; --seq-8: #5c0816;
  --side-open: 300px;
  --readme-w: 0px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #0f0f0f; --surface: #1c1c1c; --surface-2: #262626;
    --ink: #ffffff; --ink-2: #c8c8c9; --muted: #8f9093;
    --grid: #2c2c2c; --axis: #444444; --border: rgba(255, 255, 255, 0.10);
    --hist: #c8c8c9; --s1: #EF3A47; --neutral: #9a9b9e;
    --band: rgba(239, 58, 71, 0.22); --wash: rgba(255, 255, 255, 0.04); --track: #3a3a3a; --fail: rgba(255, 255, 255, 0.04);
    --wordmark: #ffffff; --shadow: none;
    --tiles: grayscale(1) invert(1) brightness(0.82) contrast(0.88);
    --seq-0: #3d0a13; --seq-1: #5c0c1b; --seq-2: #7d0f24; --seq-3: #a3142f; --seq-4: #c41230;
    --seq-5: #e0384f; --seq-6: #ef6a7b; --seq-7: #f6a0ab; --seq-8: #fbd2d8;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0f0f0f; --surface: #1c1c1c; --surface-2: #262626;
  --ink: #ffffff; --ink-2: #c8c8c9; --muted: #8f9093;
  --grid: #2c2c2c; --axis: #444444; --border: rgba(255, 255, 255, 0.10);
  --hist: #c8c8c9; --s1: #EF3A47; --neutral: #9a9b9e;
  --band: rgba(239, 58, 71, 0.22); --wash: rgba(255, 255, 255, 0.04); --track: #3a3a3a; --fail: rgba(255, 255, 255, 0.04);
  --wordmark: #ffffff; --shadow: none;
  --tiles: grayscale(1) invert(1) brightness(0.82) contrast(0.88);
  --seq-0: #3d0a13; --seq-1: #5c0c1b; --seq-2: #7d0f24; --seq-3: #a3142f; --seq-4: #c41230;
  --seq-5: #e0384f; --seq-6: #ef6a7b; --seq-7: #f6a0ab; --seq-8: #fbd2d8;
}

/* ------------------------------------------------------------ base */
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--page);
  color: var(--ink);
  font: 14px/1.5 "Open Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
/* the CMU red rule across the top of the page */
body::before { content: ""; position: fixed; inset: 0 0 auto 0; height: 4px; background: var(--red); z-index: 1000; }
a { color: var(--s1); }
code { font: 12px ui-monospace, SFMono-Regular, Consolas, monospace; background: var(--surface-2); padding: 1px 4px; border-radius: 4px; }
.muted { color: var(--muted); font-weight: 400; }
button, input, select { font: inherit; color: inherit; }
svg { flex: none; }

.app {
  --side-w: var(--side-open);
  display: grid;
  grid-template-columns: var(--side-w) minmax(0, 1fr) var(--readme-w);
  min-height: 100vh;
  transition: grid-template-columns .25s ease;
}
.app.side-hidden { --side-w: 0px; }
.app.readme-open { --readme-w: 440px; }
.app.dragging { transition: none; user-select: none; cursor: col-resize; }
.app.dragging .side, .app.dragging main { pointer-events: none; }

/* drag handle on the controls panel edge; at the left edge when the panel is hidden */
.side-resizer { position: fixed; top: 0; bottom: 0; left: calc(var(--side-w) - 5px); width: 10px; z-index: 950; cursor: col-resize; touch-action: none; outline: none; }
.side-hidden .side-resizer { left: 0; }
.side-resizer::after { content: ""; position: absolute; top: 0; bottom: 0; left: 4px; width: 2px; background: var(--s1); opacity: 0; transition: opacity .15s; }
.side-resizer:hover::after, .side-resizer:focus-visible::after, .app.dragging .side-resizer::after { opacity: 1; }
.app.snap .side-resizer::after { opacity: 1; background: var(--muted); }
/* when the panel is hidden, a small grip tab at the left edge (drag or click to reopen) */
.side-hidden .side-resizer { width: 16px; cursor: e-resize; }
.side-hidden .side-resizer::before { content: ""; position: absolute; top: calc(50% - 30px); left: 0; width: 14px; height: 60px; background: var(--surface) repeating-linear-gradient(90deg, transparent 0 4px, var(--axis) 4px 5px, transparent 5px 7px) 3px 18px / 8px 24px no-repeat; border: 1px solid var(--border); border-left: 0; border-radius: 0 8px 8px 0; box-shadow: var(--shadow); }
.side-hidden .side-resizer:hover::before { border-color: var(--s1); }

/* ------------------------------------------------------------ sidebar */
.side { position: sticky; top: 0; height: 100vh; overflow: hidden; background: var(--surface); border-right: 1px solid var(--border); }
.side-hidden .side { border-right-color: transparent; }
.side-inner { width: var(--side-open); height: 100%; overflow-y: auto; padding: 22px 18px 28px; }
.brand { display: flex; align-items: center; gap: 10px; padding: 2px 2px 16px; }
.brand-mark { width: 30px; height: 30px; }
.brand-mark circle { fill: var(--sun); }
.brand-mark g { stroke: var(--sun); }
.brand-name { font-weight: 700; font-size: 16px; letter-spacing: -0.01em; }

.ctl-group { border-top: 1px solid var(--border); padding: 16px 2px 6px; }
.ctl-group h2 { font-size: 11px; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--ink-2); margin: 0 0 12px; }
.ctl-row { margin: 0 0 14px; }
.ctl-row > label, .ctl-head { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--ink-2); margin-bottom: 4px; }
.ctl-head label { display: inline; }
.ctl-head output { margin-left: auto; }
/* "?" help buttons and their floating explanation */
.q { flex: none; width: 16px; height: 16px; border-radius: 50%; border: 1px solid var(--axis); background: var(--surface); color: var(--ink-2); font-size: 10.5px; font-weight: 700; line-height: 14px; text-align: center; padding: 0; cursor: help; vertical-align: 1px; text-transform: none; letter-spacing: 0; }
.q:hover, .q:focus-visible, .q[aria-expanded="true"] { border-color: var(--s1); color: var(--s1); outline: none; }
.ctl-group h2 .q { margin-left: 4px; }
.q-inline { display: inline-block; width: 15px; height: 15px; border-radius: 50%; border: 1px solid var(--axis); font-size: 10px; font-weight: 700; line-height: 13px; text-align: center; color: var(--ink-2); }
.qtip { position: fixed; z-index: 2000; max-width: 280px; background: var(--ink); color: var(--surface); font-size: 12.5px; line-height: 1.45; padding: 9px 11px; border-radius: 8px; box-shadow: 0 8px 28px rgba(0,0,0,.22); pointer-events: none; }
.ctl-row output { font-variant-numeric: tabular-nums; color: var(--ink); font-weight: 600; font-size: 13px; }
.inline { display: flex; gap: 8px; }
.inline input { width: 90px; }
input[type="number"], select { background: var(--surface-2); border: 1px solid var(--border); border-radius: 6px; padding: 5px 8px; min-width: 0; }
input[type="file"] { font-size: 12px; max-width: 100%; }
/* sliders drawn with theme colours (native tracks stay white in dark mode);
   --pct is the filled share, set from JS */
input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 18px; margin: 2px 0 0; background: transparent; cursor: pointer; --pct: 50%; }
input[type="range"]::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: linear-gradient(to right, var(--s1) 0 var(--pct), var(--track) var(--pct) 100%); }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 14px; height: 14px; margin-top: -5px; border-radius: 50%; background: var(--s1); border: 2px solid var(--surface); box-shadow: 0 0 0 1px var(--s1); }
input[type="range"]::-moz-range-track { height: 4px; border-radius: 2px; background: var(--track); }
input[type="range"]::-moz-range-progress { height: 4px; border-radius: 2px; background: var(--s1); }
input[type="range"]::-moz-range-thumb { width: 12px; height: 12px; border-radius: 50%; background: var(--s1); border: 2px solid var(--surface); box-shadow: 0 0 0 1px var(--s1); }
input[type="range"]:focus-visible { outline: 2px solid var(--s1); outline-offset: 3px; border-radius: 4px; }

.help { font-size: 12px; color: var(--muted); line-height: 1.45; margin: 6px 0; }
.link-btn { border: 0; background: none; padding: 0; color: var(--s1); cursor: pointer; font-size: 12.5px; font-weight: 600; }
details.gen { margin: 4px 0 8px; border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; background: var(--surface-2); }
details.gen summary { cursor: pointer; font-size: 13px; color: var(--ink-2); }
details.gen[open] summary { margin-bottom: 10px; }
.gen .sep { font-size: 11px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); margin: 4px 0 10px; }

.seg { display: inline-flex; background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 2px; margin-bottom: 14px; }
.seg button { border: 0; background: transparent; padding: 5px 11px; border-radius: 6px; cursor: pointer; color: var(--ink-2); font-size: 13px; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 0 0 1px var(--border), 0 1px 2px rgba(0,0,0,.06); font-weight: 600; }
.seg.small { margin: 0; }
.seg.small button { font-size: 12.5px; padding: 4px 9px; }

.btn { border: 1px solid var(--border); background: var(--surface-2); border-radius: 6px; padding: 6px 11px; cursor: pointer; font-size: 13px; display: inline-flex; align-items: center; gap: 6px; }
.btn:hover { border-color: var(--axis); }
.btn.ghost { background: transparent; }
.actions .btn { width: 100%; justify-content: center; }
.actions .dl { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 12px; font-size: 12.5px; }
.actions .dl .btn { width: auto; padding: 4px 9px; font-size: 12.5px; }

.icon-btn { width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); cursor: pointer; display: grid; place-items: center; padding: 0; }
.icon-btn.small { width: 28px; height: 28px; border-color: transparent; background: transparent; }
.icon-btn:hover { border-color: var(--axis); }
.icon-btn svg, .btn svg { width: 17px; height: 17px; fill: none; stroke: var(--ink-2); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon-btn svg .fill { fill: var(--ink-2); stroke: none; }

/* ------------------------------------------------------------ main */
main { padding: 26px 30px 36px; width: 100%; min-width: 0; }
.top { display: flex; justify-content: space-between; gap: 20px; align-items: center; flex-wrap: wrap; }
.top-left { display: flex; align-items: center; gap: 16px; min-width: 0; }
.cmu-logo { text-decoration: none; display: inline-flex; align-items: center; }
.wordmark { font-weight: 700; font-size: 20px; color: var(--wordmark); letter-spacing: 0.005em; white-space: nowrap; line-height: 1.1; display: flex; flex-direction: column; }
.wordmark-sub { font-size: 14px; font-weight: 600; color: var(--ink-2); letter-spacing: 0.01em; margin-top: 3px; }
.top-divider { width: 1px; height: 34px; background: var(--axis); }
h1 { font-size: 21px; font-weight: 700; letter-spacing: -0.015em; margin: 0; line-height: 1.2; }
.kicker { font-size: 12px; color: var(--ink-2); font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; margin-top: 2px; }
.top-right { display: flex; gap: 10px; align-items: center; flex: none; }
.readme-btn { height: 34px; font-weight: 600; background: var(--surface); }
.readme-btn[aria-expanded="true"] { border-color: var(--s1); color: var(--s1); }
.readme-btn[aria-expanded="true"] svg { stroke: var(--s1); }

.toolbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin: 22px 0 16px; flex-wrap: wrap; }
.tabs { display: inline-flex; gap: 4px; border-bottom: 1px solid var(--border); }
.tabs button { border: 0; background: none; padding: 8px 14px 10px; cursor: pointer; color: var(--ink-2); font-weight: 600; border-bottom: 3px solid transparent; margin-bottom: -1px; }
.tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--s1); }
.status { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--ink-2); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--good); }
.status.busy .status-dot { background: var(--s1); animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.3; } }
.progress { width: 80px; height: 4px; background: var(--surface-2); border-radius: 2px; overflow: hidden; }
.progress span { display: block; height: 100%; width: 0; background: var(--s1); transition: width .15s; }
.error { border: 1px solid var(--critical); color: var(--critical); background: var(--surface); padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; }

/* ------------------------------------------------------------ cards */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 18px 20px 16px; box-shadow: var(--shadow); margin-bottom: 16px; min-width: 0; transition: opacity .2s; }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 8px; flex-wrap: wrap; }
.card h3 { font-size: 15.5px; font-weight: 700; margin: 0; letter-spacing: -0.01em; }
.sub-h { font-size: 13px; font-weight: 600; color: var(--ink-2); margin: 14px 0 0; }
.note { font-size: 12.5px; color: var(--muted); margin: 8px 0 0; }
.grid-2 { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 16px; }
.grid-2 > .card { margin-bottom: 16px; }
.updating .card { opacity: 0.62; }

.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 12.5px; color: var(--ink-2); margin: 4px 0 6px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.lk { display: inline-block; flex: none; }
.lk.line { width: 16px; height: 2px; border-radius: 1px; }
.lk.box { width: 14px; height: 10px; border-radius: 3px; }
.lk.dot { width: 8px; height: 8px; border-radius: 50%; }
.lk.vline { width: 2px; height: 12px; }
.lk.s1 { background: var(--s1); }
.lk.hist { background: var(--hist); }
.lk.band { background: var(--band); }
.lk.ref { background: var(--ink); }

.table-wrap { overflow-x: auto; margin-top: 4px; }
.tbl { width: 100%; border-collapse: collapse; font-size: 12.5px; font-variant-numeric: tabular-nums; }
.tbl th, .tbl td { padding: 6px 8px; text-align: right; border-bottom: 1px solid var(--grid); white-space: nowrap; }
.tbl th:first-child, .tbl td:first-child { text-align: left; }
.tbl th { font-weight: 600; color: var(--ink-2); font-size: 12px; }
.tbl .sw { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; vertical-align: 0; }
.tbl .flag { font-size: 11px; color: var(--muted); margin-left: 4px; }
.foot { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; color: var(--muted); font-size: 12px; padding: 4px 2px; }

/* ------------------------------------------------------------ map */
.map-host { position: relative; height: 400px; border-radius: 8px; overflow: hidden; background: var(--surface-2); }
.map-host.viz { height: auto; background: none; overflow: visible; }
.map-host .leaflet-tile-pane { filter: var(--tiles); }
.leaflet-container { font: inherit; background: var(--surface-2); }
.leaflet-control-attribution { font-size: 10.5px; background: color-mix(in srgb, var(--surface) 85%, transparent) !important; color: var(--ink-2); }
.leaflet-control-attribution a { color: var(--ink-2); }
.leaflet-bar a, .leaflet-bar a:hover { background: var(--surface); color: var(--ink); border-bottom-color: var(--border); }
.leaflet-bar { border-color: var(--border) !important; }
.sub-icon svg { display: block; overflow: visible; }
.sub-icon path { fill: var(--surface); stroke: var(--ink); stroke-width: 1.6; stroke-linejoin: round; }
.leaflet-tooltip.map-tip { background: var(--surface); color: var(--ink); border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 6px 24px rgba(0,0,0,.14); padding: 8px 10px; font-size: 12px; }
.leaflet-tooltip.map-tip::before { display: none; }
/* map key: mirrors the markers drawn on the map */
.lk.map-circuit { width: 11px; height: 11px; border-radius: 50%; background: var(--s1); box-shadow: 0 0 0 1.5px var(--surface), 0 0 0 2.5px var(--border); }
.lk.map-substation { width: 14px; height: 13px; }
.lk.map-substation path { fill: var(--surface); stroke: var(--ink); stroke-width: 1.6; stroke-linejoin: round; }
.lk.map-link-key { background: var(--ink); opacity: 0.55; height: 1.5px; }
.map-legend { display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; font-size: 11.5px; color: var(--ink-2); margin-top: 10px; font-variant-numeric: tabular-nums; }
.map-legend .ramp { width: min(240px, 50%); height: 8px; border-radius: 4px; }
.map-legend .cap { width: 100%; text-align: center; color: var(--muted); }

/* ------------------------------------------------------------ README panel */
.readme { position: sticky; top: 0; height: 100vh; overflow: hidden; background: var(--surface); border-left: 1px solid var(--border); }
.app:not(.readme-open) .readme { border-left-color: transparent; visibility: hidden; transition: visibility 0s .25s; }
.readme-inner { width: 440px; height: 100%; overflow-y: auto; padding: 22px 24px 40px; scroll-behavior: smooth; }
.readme-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.readme-head h2 { font-size: 17px; margin: 0; font-weight: 700; }
.readme-toc { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 12.5px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.readme-toc a { text-decoration: none; font-weight: 600; }
.readme section { padding: 16px 0 6px; border-bottom: 1px solid var(--border); scroll-margin-top: 8px; }
.readme section:last-child { border-bottom: 0; }
.readme h3 { font-size: 14.5px; margin: 0 0 8px; color: var(--ink); font-weight: 700; }
.readme h3::before { content: ""; display: inline-block; width: 3px; height: 13px; background: var(--s1); margin-right: 8px; vertical-align: -1px; }
.readme h4 { font-size: 13px; margin: 12px 0 4px; }
.readme p, .readme li, .readme dd { color: var(--ink-2); font-size: 13px; }
.readme p { margin: 0 0 8px; }
.readme ul { margin: 0 0 8px; padding-left: 18px; }
.readme ol { margin: 4px 0 4px; padding-left: 20px; }
.readme dl { margin: 0 0 8px; }
.readme dt { font-weight: 600; font-size: 13px; margin-top: 6px; }
.readme dd { margin: 1px 0 0; }
.readme .md { margin: 4px 0 10px; padding: 6px 4px; overflow-x: auto; overflow-y: hidden; color: var(--ink); }
/* math: KaTeX when it loads, a Times-style fallback otherwise */
.katex { font-size: 1.08em; }
.ctl-head .katex { font-size: 1.05em; }
.ctl-head output .katex { font-size: 1.1em; }
.tex-fallback { font-family: "Latin Modern Roman", "CMU Serif", "Times New Roman", Times, serif; font-size: 1.08em; }
.qtip .katex { font-size: 1.04em; }
/* citation */
.cite-box { border: 1px solid var(--border); border-left: 3px solid var(--s1); background: var(--surface-2); border-radius: 6px; padding: 10px 12px; margin: 6px 0 8px; }
.cite-box p { color: var(--ink); margin: 0 0 8px; padding-left: 1.5em; text-indent: -1.5em; overflow-wrap: anywhere; }
.cite-box .btn { padding: 3px 9px; font-size: 12px; }
.cite-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.cite-lede { margin: 0 0 6px; color: var(--ink-2); font-size: 13px; }
.card.cite .cite-box { margin-bottom: 2px; }
.readme .ref { font-size: 12.5px; }
.readme .chart { margin: 6px 0; }

/* ------------------------------------------------------------ charts */
.chart { position: relative; min-height: 40px; }
.viz svg { display: block; overflow: visible; }
.viz text { font-family: inherit; }
.viz .grid { stroke: var(--grid); stroke-width: 1; shape-rendering: crispEdges; }
.viz .axis-base { stroke: var(--axis); stroke-width: 1; shape-rendering: crispEdges; }
.viz .tick { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.viz .ref-line { stroke: var(--axis); stroke-width: 1; }
.viz .ref-line.strong { stroke: var(--muted); }
.viz .ref-label { fill: var(--ink-2); font-size: 11px; paint-order: stroke; stroke: var(--surface); stroke-width: 3px; stroke-linejoin: round; }
.viz .fc-wash { fill: var(--wash); }
.viz .fail-wash { fill: var(--fail); }
.viz .band { fill: var(--band); }
.viz .band.partial { opacity: 0.6; }
.viz .line { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.viz .line.thin { stroke-width: 1.5; }
.viz .line.s1 { stroke: var(--s1); }
.viz .line.hist { stroke: var(--hist); }
.viz .dot { stroke: var(--surface); stroke-width: 2; }
.viz .dot.s1, .viz .dot.c1 { fill: var(--s1); }
.viz .dot.hist { fill: var(--hist); }
.viz .dot.cn { fill: var(--neutral); }
.viz .dot.lift { stroke-width: 3; }
.viz .end-label, .viz .dot-label { fill: var(--ink); font-size: 11.5px; font-weight: 600; paint-order: stroke; stroke: var(--surface); stroke-width: 3px; }
.viz .panel-title { fill: var(--ink-2); font-size: 12px; font-weight: 600; }
.viz .crosshair { stroke: var(--muted); stroke-width: 1; }
.viz .leader { stroke: var(--muted); stroke-width: 1; }
.viz .hit { fill: transparent; cursor: crosshair; outline: none; }
.viz rect.hit.on { fill: var(--wash); }
.viz .col.hist { fill: var(--hist); opacity: 0.5; }
.viz .col.s1 { fill: var(--s1); opacity: 0.88; }
.viz .whisker { stroke: var(--ink-2); stroke-width: 1.5; }
.viz .whisker.s1 { stroke: var(--s1); stroke-width: 2; stroke-linecap: round; }
.viz .ref-tick { stroke: var(--ink); stroke-width: 2; }
.viz .hover-col { fill: var(--wash); }
.viz .map-bg { fill: var(--surface-2); }
.viz .map-link { stroke: var(--axis); stroke-width: 1; opacity: 0.8; }
.viz .map-dot { stroke: var(--surface); stroke-width: 1.5; transition: opacity .12s; }
.viz .map-dot.dim { opacity: 0.25; }
.viz .map-sub { fill: var(--surface); stroke: var(--ink-2); stroke-width: 1.5; stroke-linejoin: round; }
.viz .map-ring { fill: none; stroke: var(--ink); stroke-width: 2; pointer-events: none; }

.viz-tip {
  position: absolute; z-index: 5; pointer-events: none;
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 10px; font-size: 12px; box-shadow: 0 6px 24px rgba(0,0,0,.12); min-width: 140px;
}
.tip-title { font-weight: 600; color: var(--ink-2); margin-bottom: 4px; font-size: 11.5px; }
.tip-row { display: flex; align-items: center; gap: 7px; white-space: nowrap; line-height: 1.6; }
.tip-key { width: 12px; height: 2px; border-radius: 1px; flex: none; }
.tip-key.k-s1, .tip-key.k-c1 { background: var(--s1); }
.tip-key.k-cn { background: var(--neutral); }
.tip-key.k-hist { background: var(--hist); }
.tip-key.k-band { background: var(--band); height: 8px; }
.tip-key.k-dot { background: var(--s1); width: 7px; height: 7px; border-radius: 50%; }
.tip-key.k-ref { background: var(--ink); }
.tip-val { font-weight: 700; font-variant-numeric: tabular-nums; color: var(--ink); }
.tip-lab { color: var(--muted); }

/* ------------------------------------------------------------ responsive */
@media (max-width: 1240px) {
  .grid-2 { grid-template-columns: minmax(0, 1fr); }
  /* README overlays instead of pushing the content */
  .app.readme-open { --readme-w: 0px; }
  .readme { position: fixed; right: 0; top: 0; z-index: 900; width: min(440px, 92vw); transform: translateX(100%); transition: transform .25s ease, visibility 0s .25s; }
  .app.readme-open .readme { transform: none; box-shadow: -12px 0 40px rgba(0,0,0,.18); transition: transform .25s ease; }
  .readme-inner { width: 100%; }
}
@media (max-width: 900px) {
  .app { grid-template-columns: minmax(0, 1fr); }
  .side { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--border); }
  .side-inner { width: auto; }
  .side-resizer { display: none; }
  main { padding: 22px 16px 32px; }
  .top-divider { display: none; }
}
@media (max-width: 640px) {
  .wordmark { font-size: 17px; }
  .top-left { flex-wrap: wrap; gap: 10px; }
}