/* LLM Coverage — design system.
   Palette: validated dataviz reference instance (see README for validator output). */
:root {
  color-scheme: light;
  --surface-0:  #f7f6f3;
  --surface-1:  #fcfcfb;
  --surface-2:  #f0efec;
  --border:     #e2e0da;
  --border-str: #cdcac1;
  --ink-1:      #0b0b0b;
  --ink-2:      #52514e;
  --ink-3:      #7d7b74;
  --series-1:   #2a78d6;
  --series-2:   #eb6834;
  --series-3:   #1baf7a;
  --accent:     #2a78d6;
  --accent-soft:#e8f0fc;
  --rank-1: #86b6ef; --rank-2: #5598e7; --rank-3: #2a78d6; --rank-4: #1c5cab; --rank-5: #0d366b;
  --seq-100:#cde2fb; --seq-200:#9ec5f4; --seq-300:#6da7ec; --seq-450:#2a78d6; --seq-600:#184f95; --seq-700:#0d366b;
  --good: #008300; --warn: #eda100; --crit: #e34948;
  --shadow: 0 1px 2px rgba(11,11,11,.05), 0 8px 24px -12px rgba(11,11,11,.12);
  --display: ui-serif, "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --r: 8px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --surface-0: #111110; --surface-1: #1a1a19; --surface-2: #232322;
    --border: #33332f; --border-str: #4a4a45;
    --ink-1: #ffffff; --ink-2: #c3c2b7; --ink-3: #8e8d84;
    --series-1:#3987e5; --series-2:#d95926; --series-3:#199e70;
    --accent:#3987e5; --accent-soft:#1b2d45;
    --rank-1:#b7d3f6; --rank-2:#86b6ef; --rank-3:#5598e7; --rank-4:#2a78d6; --rank-5:#184f95;
    --seq-100:#0d366b; --seq-200:#184f95; --seq-300:#256abf; --seq-450:#3987e5; --seq-600:#86b6ef; --seq-700:#b7d3f6;
    --good:#3fa63f; --warn:#c98500; --crit:#e66767;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px -14px rgba(0,0,0,.6);
  }
}
[data-theme="dark"] {
  color-scheme: dark;
  --surface-0: #111110; --surface-1: #1a1a19; --surface-2: #232322;
  --border: #33332f; --border-str: #4a4a45;
  --ink-1: #ffffff; --ink-2: #c3c2b7; --ink-3: #8e8d84;
  --series-1:#3987e5; --series-2:#d95926; --series-3:#199e70;
  --accent:#3987e5; --accent-soft:#1b2d45;
  --rank-1:#b7d3f6; --rank-2:#86b6ef; --rank-3:#5598e7; --rank-4:#2a78d6; --rank-5:#184f95;
  --seq-100:#0d366b; --seq-200:#184f95; --seq-300:#256abf; --seq-450:#3987e5; --seq-600:#86b6ef; --seq-700:#b7d3f6;
  --good:#3fa63f; --warn:#c98500; --crit:#e66767;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px -14px rgba(0,0,0,.6);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--surface-0); color: var(--ink-1);
  font: 15px/1.55 var(--sans);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1,h2,h3 { font-family: var(--display); font-weight: 600; letter-spacing: -.015em; margin: 0; line-height: 1.15; }
h1 { font-size: clamp(28px, 4vw, 44px); }
h2 { font-size: 22px; }
h3 { font-size: 16px; font-family: var(--sans); font-weight: 600; letter-spacing: 0; }
p { margin: 0 0 1em; color: var(--ink-2); }
.lede { font-size: 17px; max-width: 68ch; }

/* ---- chrome ---- */
header.top {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--surface-0) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.top-in { max-width: 1220px; margin: 0 auto; padding: 10px 24px; display: flex; align-items: center; gap: 22px; }
.brand { font-family: var(--display); font-weight: 600; font-size: 16px; color: var(--ink-1); display: flex; align-items: center; gap: 9px; white-space: nowrap; }
.brand .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); flex: none; }
nav.main { display: flex; gap: 2px; flex-wrap: wrap; margin-left: auto; }
nav.main a {
  padding: 6px 11px; border-radius: 6px; font-size: 13.5px; color: var(--ink-2); font-weight: 500;
}
nav.main a:hover { background: var(--surface-2); color: var(--ink-1); text-decoration: none; }
nav.main a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }
.theme-btn {
  border: 1px solid var(--border); background: var(--surface-1); color: var(--ink-2);
  width: 30px; height: 30px; border-radius: 6px; cursor: pointer; font-size: 13px; line-height: 1; flex: none;
}
.theme-btn:hover { color: var(--ink-1); border-color: var(--border-str); }

main { max-width: 1220px; margin: 0 auto; padding: 34px 24px 96px; }
.page-head { margin-bottom: 30px; }
.eyebrow { font: 600 11.5px/1 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 12px; }
footer.btm { border-top: 1px solid var(--border); margin-top: 40px; padding: 24px; text-align: center; color: var(--ink-3); font-size: 13px; }

/* ---- cards & grid ---- */
.card { background: var(--surface-1); border: 1px solid var(--border); border-radius: var(--r); padding: 20px; box-shadow: var(--shadow); }
.card > h3, .card > h2 { margin-bottom: 4px; }
.card .sub { color: var(--ink-3); font-size: 13px; margin: 0 0 16px; }
.grid { display: grid; gap: 16px; }
.g-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.g-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.g-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.g-sidebar { grid-template-columns: minmax(0,1.65fr) minmax(0,1fr); }
@media (max-width: 900px) { .g-2,.g-3,.g-4,.g-sidebar { grid-template-columns: 1fr; } }
.stack { display: grid; gap: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }

/* ---- stat tiles ---- */
.stat { background: var(--surface-1); border: 1px solid var(--border); border-radius: var(--r); padding: 16px 18px; }
.stat .k { font: 600 11.5px/1 var(--sans); letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); }
.stat .v { font-family: var(--display); font-size: 38px; font-weight: 600; line-height: 1.05; margin: 9px 0 3px; letter-spacing: -.02em; }
.stat .v small { font-size: 17px; color: var(--ink-3); font-weight: 400; margin-left: 2px; }
.stat .d { font-size: 12.5px; color: var(--ink-3); }
.stat.hero .v { font-size: 52px; color: var(--accent); }

/* ---- table ---- */
table.data { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.data th {
  text-align: left; font: 600 11.5px/1.3 var(--sans); letter-spacing: .06em; text-transform: uppercase;
  color: var(--ink-3); padding: 0 10px 9px; border-bottom: 1px solid var(--border-str); white-space: nowrap;
}
table.data th.num, table.data td.num { text-align: right; }
table.data td { padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: middle; }
table.data tbody tr:hover { background: var(--surface-2); }
table.data td.rk { color: var(--ink-3); font-size: 12.5px; width: 34px; }
.ent { font-weight: 500; }
.scroll-x { overflow-x: auto; }
.bar-cell { position: relative; min-width: 132px; padding-left: 10px !important; }
.bar-cell > i { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); height: 7px; border-radius: 0 4px 4px 0; background: var(--series-1); display: block; }

/* ---- pills / tags ---- */
.pill {
  display: inline-flex; align-items: center; gap: 5px; padding: 2px 8px; border-radius: 999px;
  font-size: 11.5px; font-weight: 600; letter-spacing: .02em;
  background: var(--surface-2); color: var(--ink-2); border: 1px solid var(--border); white-space: nowrap;
}
.pill.focal { background: var(--accent-soft); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 32%, transparent); }
.pill.gap { background: var(--surface-2); color: var(--ink-3); font-style: italic; }
.chip-row { display: flex; gap: 6px; flex-wrap: wrap; }
button.chip {
  font: 500 13px var(--sans); padding: 5px 11px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface-1); color: var(--ink-2);
}
button.chip:hover { border-color: var(--border-str); color: var(--ink-1); }
button.chip[aria-pressed="true"] { background: var(--ink-1); border-color: var(--ink-1); color: var(--surface-1); }
input.search {
  font: 14px var(--sans); padding: 8px 12px; border-radius: 6px; width: 100%;
  border: 1px solid var(--border); background: var(--surface-1); color: var(--ink-1);
}
input.search:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
.toolbar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 20px; }
.toolbar .grow { flex: 1 1 240px; min-width: 200px; }

/* ---- charts ---- */
figure.viz { margin: 0; }
figure.viz figcaption { font-size: 12.5px; color: var(--ink-3); margin-top: 10px; }
svg.chart { display: block; width: 100%; overflow: visible; }
svg.chart text { font: 12px var(--sans); fill: var(--ink-2); font-variant-numeric: tabular-nums; }
svg.chart text.lbl { fill: var(--ink-1); }
svg.chart text.val { fill: var(--ink-2); font-weight: 600; }
svg.chart .grid-line { stroke: var(--border); stroke-width: 1; }
svg.chart .axis-line { stroke: var(--border-str); stroke-width: 1; }
svg.chart .hit { fill: transparent; cursor: pointer; }
svg.chart .mark { transition: opacity .12s; }
svg.chart.dim .mark { opacity: .35; }
svg.chart .mark.on { opacity: 1; }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12.5px; color: var(--ink-2); margin-bottom: 12px; }
.legend i { width: 10px; height: 10px; border-radius: 2px; display: inline-block; margin-right: 5px; vertical-align: -1px; }
.tt {
  position: fixed; z-index: 90; pointer-events: none; opacity: 0; transition: opacity .1s;
  background: var(--ink-1); color: var(--surface-1); border-radius: 6px; padding: 8px 10px;
  font: 12.5px/1.45 var(--sans); max-width: 280px; box-shadow: 0 6px 24px rgba(0,0,0,.28);
}
.tt.on { opacity: 1; }
.tt b { color: var(--surface-1); }
.tt .k { opacity: .72; }

/* ---- question list ---- */
.qcard { background: var(--surface-1); border: 1px solid var(--border); border-radius: var(--r); overflow: hidden; }
.qcard + .qcard { margin-top: 12px; }
.qhead { display: flex; gap: 14px; align-items: flex-start; padding: 15px 18px; cursor: pointer; }
.qhead:hover { background: var(--surface-2); }
.qhead .qid { font: 600 11px/1.6 var(--mono); color: var(--ink-3); flex: none; padding-top: 2px; letter-spacing: .02em; }
.qhead .qt { flex: 1; font-weight: 500; }
.qhead .qmeta { display: flex; gap: 8px; align-items: center; flex: none; }
.qbody { padding: 0 18px 16px; border-top: 1px solid var(--border); }
ol.answers { list-style: none; margin: 0; padding: 0; counter-reset: a; }
ol.answers li { display: flex; gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--border); }
ol.answers li:last-child { border-bottom: 0; }
ol.answers .n {
  flex: none; width: 22px; height: 22px; border-radius: 5px; display: grid; place-items: center;
  font: 600 11.5px var(--sans); color: #fff;
}
ol.answers .n[data-r="1"] { background: var(--rank-1); color: #0d366b; }
ol.answers .n[data-r="2"] { background: var(--rank-2); color: #0d366b; }
ol.answers .n[data-r="3"] { background: var(--rank-3); }
ol.answers .n[data-r="4"] { background: var(--rank-4); }
ol.answers .n[data-r="5"] { background: var(--rank-5); }
ol.answers .txt { flex: 1; }
ol.answers .txt .e { font-weight: 600; }
ol.answers .txt .why { color: var(--ink-2); font-size: 13.5px; }
[hidden] { display: none !important; }

/* ---- callout ---- */
.callout { border-left: 3px solid var(--accent); background: var(--surface-1); border-radius: 0 var(--r) var(--r) 0; padding: 16px 20px; }
.callout.warn { border-left-color: var(--warn); }
.callout h3 { margin-bottom: 6px; }
.callout p:last-child { margin-bottom: 0; }
.note { font-size: 13px; color: var(--ink-3); }
code { font: 12.5px var(--mono); background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }
.empty { text-align: center; padding: 48px 20px; color: var(--ink-3); }