/* ==========================================================================
   CTA Observatory - styles
   Neutral palette + one accent, tabular numerals, no per-panel card borders.
   ========================================================================== */
:root{
  --bg:        #0e1013;   /* deep neutral */
  --bg-2:      #14171b;
  --panel:     #171b20;
  --ink:       #e7e9ec;   /* primary text */
  --ink-2:     #a7afb8;   /* secondary   */
  --ink-3:     #6f7883;   /* tertiary    */
  --line:      #262c34;   /* hairlines   */
  --accent:    #e0a42a;   /* the one accent (amber) */
  --accent-ink:#1a1206;
  --dim:       #3a424c;   /* cross-filter dim colour */
  --good:      #7fb06a;
  --bad:       #e06a5a;
  --focus:     #5b8def;   /* focus ring, distinct from accent */
  --class0:#c7934a; --class1:#5f8ea0; --class2:#9aa2ab; --class3:#cd7653; --class4:#8aa377;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

*{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; }
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:var(--sans); font-size:14px; line-height:1.45;
  font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;
}

.skip-link{ position:absolute; left:-999px; top:0; background:var(--accent);
  color:var(--accent-ink); padding:.5rem .8rem; z-index:100; border-radius:0 0 6px 0; }
.skip-link:focus{ left:0; }

/* ---- top bar ---- */
.topbar{
  position:sticky; top:0; z-index:20;
  display:grid; grid-template-columns:1fr auto; gap:.75rem 1.25rem;
  align-items:center;
  padding:.6rem 1rem; background:linear-gradient(var(--bg-2),var(--bg));
  border-bottom:1px solid var(--line);
}
.brand{ display:flex; align-items:center; gap:.7rem; }
.brand-mark{ width:34px; height:34px; color:var(--accent); flex:none; }
.brand-text{ display:flex; flex-direction:column; line-height:1.15; }
.brand-title{ font-weight:650; letter-spacing:.01em; font-size:15px; }
.brand-sub{ color:var(--ink-3); font-size:11.5px; }

.filters{ display:flex; flex-wrap:wrap; gap:.55rem 1.1rem; align-items:flex-start; }
.filter-group{ display:flex; align-items:center; gap:.4rem; }
.filter-label{ font-size:11px; text-transform:uppercase; letter-spacing:.07em;
  color:var(--ink-3); }
.chips{ display:flex; gap:.3rem; flex-wrap:wrap; }
.chip{
  font:inherit; font-size:12px; padding:.2rem .5rem; border-radius:999px;
  border:1px solid var(--line); background:var(--panel); color:var(--ink-2);
  cursor:pointer; user-select:none; transition:background .12s, color .12s, border-color .12s;
}
.chip[aria-pressed="true"]{ background:var(--accent); color:var(--accent-ink);
  border-color:var(--accent); font-weight:600; }
.chip:hover{ border-color:var(--ink-3); }
select{
  font:inherit; font-size:12.5px; background:var(--panel); color:var(--ink);
  border:1px solid var(--line); border-radius:6px; padding:.22rem .4rem;
}
.switch{ display:inline-flex; align-items:center; gap:.35rem; font-size:12.5px;
  color:var(--ink-2); cursor:pointer; }

.topbar-actions{ display:flex; align-items:center; gap:.9rem; }
.count{ display:flex; flex-direction:column; align-items:flex-end; line-height:1.1; }
.count-num{ font-family:var(--mono); font-size:20px; font-weight:600; color:var(--accent); }
.count-lbl{ font-size:10.5px; color:var(--ink-3); text-transform:uppercase; letter-spacing:.06em; }
.btn{
  font:inherit; font-size:12.5px; cursor:pointer; color:var(--ink);
  background:var(--panel); border:1px solid var(--line); border-radius:7px;
  padding:.34rem .7rem; transition:border-color .12s, background .12s;
}
.btn:hover{ border-color:var(--ink-3); }
.btn.ghost{ background:transparent; }
.btn.tiny{ font-size:11.5px; padding:.2rem .5rem; }
.btn:focus-visible{ outline:none; box-shadow:0 0 0 2px var(--bg),0 0 0 4px var(--focus); }

/* ---- board / layout ---- */
.board{
  display:grid; gap:.55rem; padding:1rem;
  grid-template-columns:repeat(6,1fr);
  grid-auto-rows:minmax(0,auto);
}
.panel{
  position:relative; background:var(--panel); border:1px solid var(--line);
  border-radius:10px; padding:.7rem .8rem 1rem; min-width:0;
  display:flex; flex-direction:column;
}
/* no card border on every panel: remove where it reads as chrome noise */
.panel{ border-color:transparent; box-shadow:inset 0 1px 0 0 var(--line); }
.panel:focus{ outline:none; box-shadow:0 0 0 2px var(--bg),0 0 0 3px var(--focus), inset 0 1px 0 0 var(--line); }
.panel-head{ display:flex; align-items:baseline; justify-content:space-between; gap:.6rem; margin-bottom:.5rem; }
.panel-title{ font-size:13px; font-weight:600; margin:0; letter-spacing:.005em; }
.filter-note{ font-size:11px; color:var(--ink-3); text-align:right; max-width:100%;
  font-style:italic; }
.filter-note:empty{ display:none; }

.panel-area{ grid-column:span 4; grid-row:span 1; }
.panel-scatter{ grid-column:span 2; grid-row:span 2; }
.panel-cal{ grid-column:span 3; }
.panel-bar{ grid-column:span 3; }
.panel-dist{ grid-column:span 4; }
.panel-perf{ grid-column:span 2; }

.viz{ position:relative; flex:1 1 auto; min-height:150px; }
.viz-svg{ width:100%; height:100%; display:block; overflow:visible; }
.viz-canvas{ width:100%; height:100%; }
.viz-canvas-small{ width:100%; height:100%; }
canvas{ width:100%; height:100%; display:block; }

.summary{ color:var(--ink-2); font-size:12px; margin:.55rem 0 .1rem; min-height:1.7em; }
.summary b{ color:var(--ink); font-weight:600; }

/* ---- table alternatives ---- */
.table-toggle{
  align-self:flex-start; margin-top:.35rem; font-size:11.5px; color:var(--ink-3);
  background:none; border:none; border-bottom:1px dotted var(--ink-3); cursor:pointer;
  padding:0; text-decoration:underline dotted;
}
.table-toggle[aria-expanded="true"]{ color:var(--accent); border-color:var(--accent); }
.table-wrap{ margin-top:.5rem; overflow:auto; max-height:240px; }
.table-wrap table{ border-collapse:collapse; width:100%; font-size:11.5px; }
.table-wrap th,.table-wrap td{ text-align:right; padding:.28rem .5rem;
  border-bottom:1px solid var(--line); white-space:nowrap; }
.table-wrap th{ color:var(--ink-3); font-weight:600; text-align:right;
  position:sticky; top:0; background:var(--panel); }
.table-wrap th:first-child,.table-wrap td:first-child{ text-align:left; }
.table-wrap tr:last-child td{ border-bottom:none; }

/* ---- dist controls ---- */
.dist-controls{ display:flex; align-items:center; gap:1rem; margin-bottom:.5rem; flex-wrap:wrap; }
.dist-controls label{ display:inline-flex; align-items:center; gap:.35rem;
  font-size:12px; color:var(--ink-2); }
.dist-rule-note{ font-size:11.5px; color:var(--ink-3); font-family:var(--mono); }

/* ---- scatter brush rect + focus cursor ---- */
.brush-rect{ fill:rgba(224,164,42,.12); stroke:var(--accent); stroke-dasharray:4 3; stroke-width:1; }

/* ---- tooltip ---- */
.tooltip{
  position:fixed; z-index:40; pointer-events:none; hidden;
  background:var(--bg-2); border:1px solid var(--ink-3); border-radius:7px;
  padding:.4rem .55rem; font-size:11.5px; color:var(--ink);
  box-shadow:0 6px 20px rgba(0,0,0,.5); max-width:240px;
}
.tooltip.hidden{ display:none; }
.tooltip .tt-row{ display:flex; justify-content:space-between; gap:1rem; }
.tooltip .tt-k{ color:var(--ink-3); }
.tooltip .tt-v{ color:var(--ink); font-family:var(--mono); }
.tooltip .tt-head{ color:var(--accent); font-weight:600; margin-bottom:.15rem; }

/* ---- self-test overlay ---- */
.overlay{ position:fixed; inset:0; z-index:60; background:rgba(6,7,9,.72);
  backdrop-filter:blur(2px); display:flex; align-items:flex-start; justify-content:center;
  padding:2rem 1rem; overflow:auto; }
.overlay[hidden]{ display:none; }
.overlay-inner{ background:var(--panel); border:1px solid var(--line); border-radius:12px;
  max-width:820px; width:100%; padding:1.2rem 1.3rem 1.4rem; }
.overlay-head{ display:flex; align-items:center; justify-content:space-between; }
.overlay-head h2{ font-size:16px; margin:0; }
.overlay-verdict{ font-size:14px; font-weight:600; padding:.55rem .7rem; border-radius:8px;
  margin:.8rem 0 1rem; }
.overlay-verdict.pass{ color:var(--good); background:rgba(127,176,106,.12); border:1px solid rgba(127,176,106,.4); }
.overlay-verdict.fail{ color:var(--bad); background:rgba(224,106,90,.12); border:1px solid rgba(224,106,90,.4); }
.overlay-cols{ display:grid; grid-template-columns:1fr 1fr; gap:1.4rem; }
.overlay-col h3{ font-size:12.5px; color:var(--ink-2); margin:.2rem 0 .5rem; text-transform:uppercase; letter-spacing:.05em; }
.check-list{ margin:0; padding:0; list-style:none; font-size:12.5px; }
.check-list li{ display:grid; grid-template-columns:auto 1fr auto; gap:.5rem .6rem;
  align-items:center; padding:.32rem 0; border-bottom:1px solid var(--line); }
.check-list .mark{ font-family:var(--mono); font-weight:700; }
.check-list .mark.pass{ color:var(--good); }
.check-list .mark.fail{ color:var(--bad); }
.check-list .k{ color:var(--ink-2); font-family:var(--mono); font-size:11.5px; }
.check-list .val{ color:var(--ink-3); font-family:var(--mono); font-size:11px; text-align:right; }
.method-hint{ font-size:11.5px; color:var(--ink-3); margin:.9rem 0 0; }

/* ---- toast ---- */
.toast{ position:fixed; left:50%; bottom:1.4rem; transform:translateX(-50%);
  z-index:70; display:flex; align-items:center; gap:.9rem; background:var(--bg-2);
  border:1px solid var(--line); border-radius:9px; padding:.5rem .7rem;
  box-shadow:0 10px 30px rgba(0,0,0,.5); }
.toast[hidden]{ display:none; }
#toastUndo{ margin-left:.3rem; }

.sr-only{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0);
  white-space:nowrap; }

/* ---- focus ring (custom, not the browser default) ---- */
.panel:focus-visible, .btn:focus-visible, .table-toggle:focus-visible,
.chip:focus-visible, select:focus-visible, .overlay :focus-visible{
  outline:none; box-shadow:0 0 0 2px var(--bg),0 0 0 4px var(--focus);
}
.panel:focus:not(:focus-visible){ box-shadow:inset 0 1px 0 0 var(--line); }

/* ---- responsive ---- */
@media (max-width:1280px){
  .board{ grid-template-columns:repeat(4,1fr); }
  .panel-area{ grid-column:span 4; }
  .panel-scatter{ grid-column:span 2; grid-row:span 2; }
  .panel-cal,.panel-bar{ grid-column:span 2; }
  .panel-dist{ grid-column:span 4; }
  .panel-perf{ grid-column:span 2; }
}
@media (max-width:1024px){
  .board{ grid-template-columns:repeat(2,1fr); }
  .panel-area,.panel-scatter,.panel-cal,.panel-bar,.panel-dist,.panel-perf{
    grid-column:span 2; grid-row:auto; }
  .panel-scatter{ min-height:340px; }
  .panel-area{ min-height:300px; }
}
@media (max-width:768px){
  .topbar{ grid-template-columns:1fr; }
  .board{ grid-template-columns:1fr; padding:.6rem; }
  .panel{ grid-column:span 1 !important; min-height:260px; }
  .overlay-cols{ grid-template-columns:1fr; }
  .filters{ gap:.4rem .8rem; }
}

/* ---- reduced motion ---- */
@media (prefers-reduced-motion:reduce){
  *{ transition:none !important; animation:none !important; }
}