/* Kenmore Budget Explorer — design system
 * Tokens use light-dark() with a prefers-color-scheme fallback (modern-web-guidance: dark-mode).
 * All text/background pairs target WCAG 2.2 AA (>= 4.5:1 body text, >= 3:1 large text & UI).
 */

:root {
  color-scheme: light dark;

  /* Light palette */
  --bg-l: #f4f6f9;   --surface-l: #ffffff; --surface-2-l: #eef2f7; --border-l: #d5dce6;
  --text-l: #17202b; --muted-l: #4a5868;   --brand-l: #0b5cad;     --brand-ink-l: #ffffff;
  --good-l: #0f7a3d; --bad-l: #b3261e;     --warn-l: #8a5a00;      --focus-l: #0b5cad;
  --grid-l: #e3e8ef; --tick-l: #4a5868;

  /* Dark palette */
  --bg-d: #0f1419;   --surface-d: #171e26; --surface-2-d: #1f2833; --border-d: #33414f;
  --text-d: #e7edf3; --muted-d: #a9b6c3;   --brand-d: #6cb4ff;     --brand-ink-d: #0b1a2a;
  --good-d: #4cc584; --bad-d: #ff8a80;     --warn-d: #f2c14e;      --focus-d: #8cc6ff;
  --grid-d: #26313d; --tick-d: #a9b6c3;

  /* Fallback for browsers without light-dark(): light first, media query below */
  --bg: var(--bg-l); --surface: var(--surface-l); --surface-2: var(--surface-2-l); --border: var(--border-l);
  --text: var(--text-l); --muted: var(--muted-l); --brand: var(--brand-l); --brand-ink: var(--brand-ink-l);
  --good: var(--good-l); --bad: var(--bad-l); --warn: var(--warn-l); --focus: var(--focus-l);
  --grid: var(--grid-l); --tick: var(--tick-l);

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgb(0 0 0 / .06), 0 2px 8px rgb(0 0 0 / .05);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --nav-w: 248px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--bg-d); --surface: var(--surface-d); --surface-2: var(--surface-2-d); --border: var(--border-d);
    --text: var(--text-d); --muted: var(--muted-d); --brand: var(--brand-d); --brand-ink: var(--brand-ink-d);
    --good: var(--good-d); --bad: var(--bad-d); --warn: var(--warn-d); --focus: var(--focus-d);
    --grid: var(--grid-d); --tick: var(--tick-d);
  }
}
@supports (color: light-dark(white, black)) {
  :root {
    --bg: light-dark(var(--bg-l), var(--bg-d)); --surface: light-dark(var(--surface-l), var(--surface-d));
    --surface-2: light-dark(var(--surface-2-l), var(--surface-2-d)); --border: light-dark(var(--border-l), var(--border-d));
    --text: light-dark(var(--text-l), var(--text-d)); --muted: light-dark(var(--muted-l), var(--muted-d));
    --brand: light-dark(var(--brand-l), var(--brand-d)); --brand-ink: light-dark(var(--brand-ink-l), var(--brand-ink-d));
    --good: light-dark(var(--good-l), var(--good-d)); --bad: light-dark(var(--bad-l), var(--bad-d));
    --warn: light-dark(var(--warn-l), var(--warn-d)); --focus: light-dark(var(--focus-l), var(--focus-d));
    --grid: light-dark(var(--grid-l), var(--grid-d)); --tick: light-dark(var(--tick-l), var(--tick-d));
  }
}
/* Explicit user override via the theme toggle (meta color-scheme is updated too). */
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }
@supports not (color: light-dark(white, black)) {
  :root[data-theme="dark"] {
    --bg: var(--bg-d); --surface: var(--surface-d); --surface-2: var(--surface-2-d); --border: var(--border-d);
    --text: var(--text-d); --muted: var(--muted-d); --brand: var(--brand-d); --brand-ink: var(--brand-ink-d);
    --good: var(--good-d); --bad: var(--bad-d); --warn: var(--warn-d); --focus: var(--focus-d); --grid: var(--grid-d); --tick: var(--tick-d);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { accent-color: var(--brand); scrollbar-color: var(--border) transparent; scrollbar-width: thin; }
body { margin: 0; font-family: var(--font); font-size: 15px; line-height: 1.5; background: var(--bg); color: var(--text); }
h1, h2, h3, h4 { line-height: 1.25; margin: 0; }
a { color: var(--brand); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 3px; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: 8px; top: -48px; background: var(--brand); color: var(--brand-ink); padding: 8px 14px; border-radius: var(--radius-sm); z-index: 100; }
.skip-link:focus { top: 8px; }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); font-size: .92em; }
.lead { font-size: 1.05rem; }

/* ---------- Shell ---------- */
.app-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 20px; background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 34px; height: 34px; fill: var(--brand); flex: none; }
.brand h1 { font-size: 1.2rem; }
.brand-sub { margin: 0; font-size: .82rem; color: var(--muted); }
.header-tools { display: flex; align-items: center; gap: 10px; }
.pill { font-size: .78rem; padding: 3px 10px; border-radius: 999px; background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); }

.layout { display: grid; grid-template-columns: var(--nav-w) minmax(0, 1fr); min-height: calc(100vh - 62px); }
.side-nav { background: var(--surface); border-right: 1px solid var(--border); padding: 14px 10px; position: sticky; top: 62px; align-self: start; height: calc(100vh - 62px); overflow-y: auto; }
.side-nav ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.nav-link { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: var(--radius-sm); color: var(--text); text-decoration: none; font-size: .92rem; }
.nav-link:hover { background: var(--surface-2); }
.nav-link[aria-current="page"] { background: var(--brand); color: var(--brand-ink); font-weight: 600; }
.nav-num { display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; border: 1.5px solid currentColor; font-size: .78rem; font-weight: 700; flex: none; }

.view { padding: 22px 26px 40px; min-width: 0; }
.view:focus { outline: none; }
.view-head { margin-bottom: 18px; }
.view-head h2 { font-size: 1.6rem; }
.view-head h2:focus { outline: none; }
.eyebrow { margin: 0 0 4px; text-transform: uppercase; letter-spacing: .08em; font-size: .74rem; color: var(--muted); font-weight: 600; }
.view-desc { margin: 6px 0 0; color: var(--muted); max-width: 95ch; }
.view-body { display: grid; gap: 18px; }
.app-footer { padding: 16px 26px; border-top: 1px solid var(--border); color: var(--muted); font-size: .8rem; background: var(--surface); }
.app-footer p { margin: 4px 0; }
.loading { color: var(--muted); }

/* ---------- Layout utilities ---------- */
.grid-2, .grid-3, .grid-4 { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.kpi-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(min(190px, 100%), 1fr)); }
.stack { display: grid; gap: 12px; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.span-2 { grid-column: span 2; }

/* ---------- Cards ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); min-width: 0; container-type: inline-size; }
.card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; padding: 14px 16px 0; }
.card-head h3 { font-size: 1.02rem; }
.card-sub { margin: 3px 0 0; color: var(--muted); font-size: .84rem; }
.card-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.card-body { padding: 12px 16px 16px; min-width: 0; }

/* ---------- KPI ---------- */
.kpi { display: flex; flex-direction: column; gap: 2px; text-align: left; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; box-shadow: var(--shadow); color: var(--text); font: inherit; min-width: 0; }
button.kpi { cursor: pointer; }
button.kpi:hover { border-color: var(--brand); }
.kpi-label { font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 600; }
.kpi-value { font-size: 1.55rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.kpi-sub, .kpi-note { font-size: .8rem; color: var(--muted); }
.kpi-delta { font-size: .84rem; font-weight: 600; color: var(--muted); }
.kpi-delta.good { color: var(--good); }
.kpi-delta.bad { color: var(--bad); }
.kpi-status { font-size: .8rem; font-weight: 600; }
.kpi-status.good { color: var(--good); } .kpi-status.bad { color: var(--bad); } .kpi-status.warn { color: var(--warn); }
.kpi-spark { color: var(--brand); margin-top: 4px; }

/* ---------- Controls ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 12px 16px; align-items: flex-end; padding: 12px 14px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.field { display: flex; flex-direction: column; gap: 4px; min-width: 0; margin: 0; border: 0; padding: 0; }
.field > label, .field legend { font-size: .76rem; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; padding: 0; }
select, input[type="search"], input[type="number"], input[type="text"] { font: inherit; font-size: .9rem; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 6px 9px; min-height: 36px; max-width: 100%; }
.range-row { display: flex; gap: 6px; align-items: center; }
.seg-row { display: inline-flex; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; flex-wrap: wrap; }
.seg { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; }
.seg label { display: block; padding: 7px 12px; font-size: .86rem; cursor: pointer; border-right: 1px solid var(--border); background: var(--surface); }
.seg:last-child label { border-right: 0; }
.seg input:checked + label { background: var(--brand); color: var(--brand-ink); font-weight: 600; }
.seg input:focus-visible + label { outline: 3px solid var(--focus); outline-offset: -3px; }
.toggle { flex-direction: row; align-items: center; gap: 8px; min-height: 36px; }
.toggle input { width: 18px; height: 18px; }
.toggle label { font-size: .88rem; }
.checklist { position: relative; }
.checklist summary { list-style: none; cursor: pointer; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 6px 28px 6px 10px; font-size: .9rem; min-height: 36px; background: var(--surface); position: relative; white-space: nowrap; }
.checklist summary::after { content: "▾"; position: absolute; right: 9px; top: 6px; color: var(--muted); }
.checklist summary::-webkit-details-marker { display: none; }
.checklist-pop { position: absolute; z-index: 30; top: calc(100% + 4px); left: 0; min-width: 260px; max-height: 340px; overflow: auto; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); box-shadow: 0 8px 28px rgb(0 0 0 / .18); padding: 8px; }
.checklist-pop ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.checklist-pop li { display: flex; gap: 8px; align-items: center; font-size: .88rem; padding: 3px 4px; }
.checklist-actions { display: flex; gap: 10px; padding: 0 4px 6px; border-bottom: 1px solid var(--border); margin-bottom: 6px; }
.btn { font: inherit; font-size: .86rem; padding: 6px 12px; min-height: 34px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface-2); color: var(--text); cursor: pointer; }
.btn:hover:not(:disabled) { border-color: var(--brand); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
.btn.icon { min-width: 34px; padding: 4px 8px; }
.btn-link { background: none; border: 0; color: var(--brand); cursor: pointer; font: inherit; font-size: .84rem; padding: 2px; text-decoration: underline; }
.btn-cite { font: inherit; font-size: .74rem; font-family: var(--mono); padding: 1px 6px; border-radius: 4px; border: 1px solid var(--border); background: var(--surface-2); color: var(--brand); cursor: pointer; white-space: nowrap; }
.btn-cite:hover { border-color: var(--brand); }
input[type="range"] { width: 100%; }

/* ---------- Notices, badges ---------- */
.notice { padding: 10px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border); border-left-width: 4px; background: var(--surface); font-size: .9rem; }
.notice.info { border-left-color: var(--brand); }
.notice.warn { border-left-color: var(--warn); }
.notice.error { border-left-color: var(--bad); }
.notice.good { border-left-color: var(--good); }
.badge { display: inline-block; font-size: .74rem; font-weight: 700; padding: 2px 8px; border-radius: 999px; border: 1px solid currentColor; white-space: nowrap; }
.badge.high, .badge.critical { color: var(--bad); }
.badge.medium, .badge.moderate { color: var(--warn); }
.badge.low { color: var(--good); }
.badge.neutral { color: var(--muted); }
.tag { display: inline-block; font-size: .74rem; padding: 1px 7px; border-radius: 4px; background: var(--surface-2); border: 1px solid var(--border); color: var(--muted); margin: 0 4px 4px 0; }
.pos { color: var(--good); } .neg { color: var(--bad); }

/* ---------- Tables ---------- */
.table-scroll { overflow: auto; max-width: 100%; border: 1px solid var(--border); border-radius: var(--radius-sm); }
.data-table { width: 100%; border-collapse: collapse; font-size: .86rem; font-variant-numeric: tabular-nums; }
.data-table caption { text-align: left; padding: 8px 10px; font-weight: 600; caption-side: top; }
.data-table th, .data-table td { padding: 7px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.data-table thead th { position: sticky; top: 0; background: var(--surface-2); font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); z-index: 1; white-space: nowrap; }
.data-table .num { text-align: right; white-space: nowrap; }
.data-table tbody tr:hover { background: var(--surface-2); }
.data-table tr.clickable { cursor: pointer; }
.data-table td.empty { text-align: center; color: var(--muted); padding: 20px; }
.data-table.compact th, .data-table.compact td { padding: 4px 8px; }
.data-table tfoot td, .data-table tr.total td, .data-table tr.total th { font-weight: 700; background: var(--surface-2); }
.th-sort { all: unset; cursor: pointer; display: inline-flex; align-items: center; gap: 2px; }
.th-sort:focus-visible { outline: 3px solid var(--focus); }
.dt { display: grid; gap: 8px; }
.dt-tools { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.dt-search { min-width: 240px; flex: 1; max-width: 420px; }
.dt-foot { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.dt-status { margin: 0; color: var(--muted); font-size: .82rem; }
.dt-pager { display: flex; gap: 6px; }

/* ---------- Charts ---------- */
.chart { position: relative; min-width: 0; }
.chart-wrap { position: relative; }
.chart svg { display: block; overflow: visible; }
.chart .grid { stroke: var(--grid); stroke-width: 1; }
.chart .grid.zero { stroke: var(--tick); stroke-width: 1.2; }
.chart .tick { fill: var(--tick); font-size: 11px; font-family: var(--font); }
.chart .tick.val { font-weight: 600; fill: var(--text); }
.chart .clickable { cursor: pointer; }
.chart .bar:hover, .chart .slice:hover, .chart .clickable:focus { opacity: .82; }
.chart .clickable:focus { outline: none; stroke: var(--text); stroke-width: 2; }
.chart .pt { stroke: var(--surface); stroke-width: 1.5; }
.chart .band { fill: var(--surface-2); }
.chart .band-label { fill: var(--muted); font-size: 10px; }
.chart .ref-line { stroke: var(--bad); stroke-dasharray: 5 4; stroke-width: 1.5; }
.chart .ref-label { fill: var(--bad); font-size: 11px; font-weight: 600; }
.chart .donut-total { fill: var(--text); font-size: 18px; font-weight: 700; }
.chart .wf-total { fill: #0072B2; }
.chart .wf-up { fill: #009E73; }
.chart .wf-down { fill: #D55E00; }
.chart .wf-connector { stroke: var(--tick); stroke-dasharray: 3 3; }
.chart-tip { position: absolute; pointer-events: none; z-index: 10; background: var(--text); color: var(--bg); padding: 6px 9px; border-radius: 6px; font-size: .8rem; max-width: 280px; box-shadow: 0 4px 14px rgb(0 0 0 / .25); }
.chart-tip strong { display: block; margin-bottom: 2px; }
.chart-legend { list-style: none; margin: 8px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: .8rem; color: var(--muted); }
.chart-legend li { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.chart-data { margin-top: 8px; font-size: .84rem; }
.chart-data summary { cursor: pointer; color: var(--brand); width: max-content; }
.chart-data .table-scroll { max-height: 300px; margin-top: 6px; }
.spark { display: block; }

/* ---------- Dialog ---------- */
dialog#drill-dialog { width: min(980px, 94vw); max-height: 88vh; padding: 0; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); box-shadow: 0 20px 60px rgb(0 0 0 / .35); }
dialog#drill-dialog::backdrop { background: rgb(10 15 20 / .55); }
.dialog-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--border); position: sticky; top: 0; background: var(--surface); z-index: 2; }
.dialog-head h2 { font-size: 1.15rem; }
.dialog-body { padding: 16px 18px 20px; overflow: auto; max-height: calc(88vh - 62px); display: grid; gap: 14px; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0; font-size: .9rem; }
.kv dt { color: var(--muted); font-weight: 600; }
.kv dd { margin: 0; word-break: break-word; }
.source-pane { border-top: 1px solid var(--border); padding-top: 10px; }
.source-pane h4 { margin-bottom: 8px; }

/* ---------- Insight cards (Module 8) & misc ---------- */
.insight-list { display: grid; gap: 12px; }
.insight { border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; background: var(--surface); display: grid; gap: 6px; }
.insight-head { display: flex; gap: 10px; align-items: baseline; justify-content: space-between; flex-wrap: wrap; }
.insight-rank { font-weight: 800; font-size: 1.1rem; color: var(--brand); margin-right: 6px; }
.insight h4 { font-size: 1rem; display: inline; }
.meter { height: 10px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); overflow: hidden; }
.meter > span { display: block; height: 100%; background: var(--brand); }
.big-number { font-size: 2rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.timeline { list-style: none; margin: 0; padding: 0 0 0 18px; border-left: 2px solid var(--border); display: grid; gap: 12px; }
.timeline li { position: relative; }
.timeline li::before { content: ""; position: absolute; left: -25px; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--brand); border: 2px solid var(--surface); }
.timeline .tl-year { font-weight: 700; font-size: .84rem; color: var(--brand); }
.timeline .tl-title { font-weight: 600; }
.timeline .tl-text { font-size: .86rem; color: var(--muted); }

/* ---------- Responsive ---------- */
@container (max-width: 520px) {
  .card-head { flex-direction: column; }
}
@media (max-width: 1180px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .app-header { flex-wrap: wrap; padding: 10px 12px; }
  .header-tools .pill { display: none; }
  .filter-bar > * { max-width: 100%; }
  .seg-row { max-width: 100%; }
  .side-nav { position: sticky; top: 62px; height: auto; z-index: 15; border-right: 0; border-bottom: 1px solid var(--border); padding: 6px; overflow-x: auto; }
  .side-nav ul { display: flex; gap: 4px; }
  .nav-link { white-space: nowrap; padding: 7px 10px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .span-2 { grid-column: auto; }
  .view { padding: 16px 12px 32px; }
  .brand-sub { display: none; }
}
@media (prefers-reduced-motion: no-preference) {
  .nav-link, .btn, .kpi { transition: background-color .15s, border-color .15s; }
}
@media print {
  .side-nav, .app-header .header-tools, .filter-bar, .dt-tools, .dt-pager, .chart-data { display: none !important; }
  .layout { display: block; }
  .card { break-inside: avoid; box-shadow: none; }
}