/* Tokens: reference data-viz palette (validated light + dark), system sans throughout. */
:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --s1: #2a78d6;   /* fuel customer */
  --s2: #eb6834;   /* pipeline hub */
  --s3: #1baf7a;
  --s4: #eda100;
  --s7: #6250d6;
  --good: #0ca30c;
  --good-text: #006300;
  --bad: #d03b3b;
  --warn: #fab219;
  --cost: #e34948;
  --kept: #0b0b0b;
  --changed-bg: #fff3d6;
  --changed-ink: #7a5300;
  --shadow: 0 1px 2px rgba(11, 11, 11, 0.06);
  --radius: 10px;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #f0efec;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --s1: #3987e5;
    --s2: #d95926;
    --s3: #199e70;
    --s4: #c98500;
    --s7: #9085e9;
    --good-text: #0ca30c;
    --cost: #e66767;
    --kept: #f0efec;
    --changed-bg: #3a2c0a;
    --changed-ink: #fab219;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d; --surface: #1a1a19; --ink: #f0efec; --ink-2: #c3c2b7; --grid: #2c2c2a;
  --axis: #383835; --border: rgba(255, 255, 255, 0.10); --s1: #3987e5; --s2: #d95926;
  --s3: #199e70; --s4: #c98500; --s7: #9085e9; --good-text: #0ca30c; --cost: #e66767;
  --kept: #f0efec; --changed-bg: #3a2c0a; --changed-ink: #fab219; --shadow: none;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--page); color: var(--ink); line-height: 1.5; font-size: 15px; }
a { color: var(--s1); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .4rem; }
h1 { font-size: 1.45rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.02rem; }
p { margin: 0 0 .6rem; }
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 16px; }

/* ── header & tabs ─────────────────────────────────────────────── */
.top { background: var(--surface); border-bottom: 1px solid var(--border); }
.top-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px;
  padding-top: 18px; padding-bottom: 8px; flex-wrap: wrap; }
.sub { color: var(--ink-2); margin: 0; }
.top-meta { display: flex; gap: 8px; flex-wrap: wrap; }
.pill { font-size: .8rem; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--border);
  color: var(--ink-2); background: var(--page); white-space: nowrap; text-decoration: none; }
.pill.link:hover { color: var(--ink); }
.tabs { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.tabs button { font: inherit; font-weight: 600; color: var(--ink-2); background: none; border: 0;
  border-bottom: 2px solid transparent; padding: 10px 12px; cursor: pointer; white-space: nowrap; }
.tabs button:hover { color: var(--ink); }
.tabs button[aria-selected="true"] { color: var(--s1); border-bottom-color: var(--s1); }
.tabs button:focus-visible, .btn:focus-visible, select:focus-visible, input:focus-visible {
  outline: 2px solid var(--s1); outline-offset: 2px; }

/* ── scenario bar ──────────────────────────────────────────────── */
.scenario { position: sticky; top: 0; z-index: 500; background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(6px); border-bottom: 1px solid var(--border); padding: 10px 0 12px; }
.scenario[hidden] { display: none; }
.scenario-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-bottom: 8px; }
.scenario-status { margin: 0; font-size: .9rem; color: var(--ink-2); }
.scenario-status strong { color: var(--ink); }
.scenario-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.site-pick { display: flex; gap: 6px; align-items: center; font-size: .85rem; font-weight: 600; color: var(--ink-2); }
.site-pick[hidden] { display: none; }
select { font: inherit; padding: 5px 8px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--ink); }
.btn { font: inherit; font-size: .85rem; font-weight: 600; padding: 6px 12px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--s1); background: var(--s1); color: #fff; }
.btn.ghost { background: transparent; color: var(--s1); }
.btn:disabled { opacity: .45; cursor: default; }
.controls { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px 16px; }
.control { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px 4px; }
.control.changed { background: var(--changed-bg); border-color: var(--warn); }
.control-top { display: flex; justify-content: space-between; gap: 6px; font-size: .78rem; color: var(--ink-2); }
.control-top b { color: var(--ink); font-size: .9rem; font-variant-numeric: tabular-nums; }
.control input[type="range"] { width: 100%; accent-color: var(--s1); margin: 2px 0 0; }
.control .base { font-size: .72rem; color: var(--muted); }
.toggle-controls { display: none; width: 100%; margin-bottom: 8px; }

/* ── layout ────────────────────────────────────────────────────── */
main { padding-top: 18px; padding-bottom: 24px; }
.panel { display: none; }
.panel.active { display: block; }
.grid { display: grid; gap: 16px; margin-bottom: 16px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.map-row { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid.wide-narrow { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; box-shadow: var(--shadow); margin-bottom: 16px; min-width: 0; }
.grid > .card { margin-bottom: 0; }
.card-head { margin-bottom: 8px; }
.hint { color: var(--ink-2); font-size: .85rem; margin: 0; }
.guide { background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--s1);
  border-radius: var(--radius); padding: 12px 16px; color: var(--ink-2); }
.guide strong { color: var(--ink); }
.chart { position: relative; height: 300px; }
.chart.tall { height: 360px; }
.map { height: 460px; border-radius: 8px; overflow: hidden; }

/* ── start here ────────────────────────────────────────────────── */
.hero { border-left: 4px solid var(--s1); }
.hero p { font-size: 1.02rem; max-width: 70ch; margin: 0; color: var(--ink-2); }
.answer, .steps, .legend-list, .sources { margin: 0; padding-left: 1.2rem; }
.answer li, .steps li, .sources li { margin-bottom: .45rem; }
.legend-list { list-style: none; padding: 0; }
.legend-list li { margin-bottom: .5rem; }
.legend-list .sw, .legend-list .flare-line, .legend-list .status { vertical-align: middle; margin-right: 6px; }
.sw { display: inline-block; width: 14px; height: 14px; border-radius: 3px; }
.sw.s1 { background: var(--s1); } .sw.s2 { background: var(--s2); }
.flare-line { display: inline-block; width: 22px; border-top: 2px dashed var(--ink-2); }
.questions { display: grid; gap: 8px; }
.questions button { font: inherit; text-align: left; padding: 9px 12px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--border); background: var(--page); color: var(--ink); }
.questions button:hover { border-color: var(--s1); color: var(--s1); }
.questions button::after { content: " →"; color: var(--s1); }
.glossary { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 28px; margin: 0; }
.glossary div { margin: 0; }
.glossary dt { font-weight: 700; }
.glossary dd { margin: 0; color: var(--ink-2); }

/* ── overview ──────────────────────────────────────────────────── */
.headline { font-size: 1.15rem; margin-bottom: 14px; }
.headline strong { white-space: nowrap; }
.kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-bottom: 16px; }
.kpi { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px;
  box-shadow: var(--shadow); }
.kpi .label { font-size: .82rem; color: var(--ink-2); }
.kpi .value { font-size: 1.9rem; font-weight: 700; margin: 2px 0; }
.kpi .note { font-size: .78rem; color: var(--muted); }

/* ── tables ────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; max-height: 460px; overflow-y: auto; }
table { border-collapse: collapse; width: 100%; font-size: .86rem; }
th { text-align: left; font-weight: 600; color: var(--ink-2); border-bottom: 1px solid var(--axis);
  padding: 7px 8px; position: sticky; top: 0; background: var(--surface); white-space: nowrap; }
td { padding: 7px 8px; border-bottom: 1px solid var(--grid); vertical-align: top; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
td.nowrap { white-space: nowrap; }
td.src { color: var(--ink-2); min-width: 280px; }
tr.selected td { background: color-mix(in srgb, var(--s1) 8%, transparent); }
.status { display: inline-flex; align-items: center; justify-content: center; width: 18px; height: 18px;
  border-radius: 50%; font-size: .7rem; font-weight: 700; color: #fff; margin-right: 6px; flex: none; }
.status.good { background: var(--good); }
.status.bad { background: var(--bad); }
.status.warn { background: var(--warn); color: #0b0b0b; }
.pos { color: var(--good-text); font-weight: 600; }
.neg { color: var(--bad); font-weight: 600; }
.chip { display: inline-block; font-size: .72rem; font-weight: 600; padding: 1px 7px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--ink-2); }
.chip.changed { background: var(--changed-bg); color: var(--changed-ink); border-color: var(--warn); }
.chip.est { background: var(--changed-bg); color: var(--changed-ink); border-color: var(--warn); }
.key { font-weight: 700; padding: 0 4px; border-radius: 4px; color: #fff; }
.key.s3 { background: var(--s3); } .key.s7 { background: var(--s7); }

/* ── economics ─────────────────────────────────────────────────── */
.crossover { display: grid; gap: 12px; }
.crossover .stat { border: 1px solid var(--border); border-radius: 8px; padding: 12px; }
.crossover .stat .value { font-size: 1.6rem; font-weight: 700; }
.crossover .stat .label { color: var(--ink-2); font-size: .85rem; }

.foot { color: var(--muted); font-size: .8rem; padding-bottom: 28px; }
.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--surface);
  padding: 8px 14px; border-radius: 8px; font-size: .85rem; opacity: 0; transition: opacity .2s; pointer-events: none; }
.toast.show { opacity: 1; }
.leaflet-container { font: inherit; background: var(--page); }
.hub-icon { width: 14px; height: 14px; background: var(--ink); border: 2px solid var(--surface); border-radius: 2px; }

/* ── small screens ─────────────────────────────────────────────── */
@media (max-width: 1000px) {
  .controls { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid.map-row, .grid.wide-narrow { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 760px) {
  .grid.two, .glossary { grid-template-columns: minmax(0, 1fr); }
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .scenario { position: static; }
  .toggle-controls { display: block; }
  .controls { display: none; }
  .controls.open { display: grid; }
  .kpi .value { font-size: 1.5rem; }
  .map { height: 340px; }
}
@media (max-width: 420px) {
  .controls { grid-template-columns: minmax(0, 1fr); }
}