:root {
  --ink: #14181f;
  --muted: #5b6270;
  --paper: #f6f3ec;
  --paper-2: #efeae0;
  --white: #fffcf7;
  --char: #12161c;
  --char-2: #1b212b;
  --steel: #3d4a5c;
  --line: rgba(20, 24, 31, .12);
  --ember: #e07a3d;
  --ember-d: #c45f24;
  --flame: #f4b942;
  --gas: #6b849c;
  --charbar: #2a2e36;
  --good: #2f7d5b;
  --good-bg: #e6f3ec;
  --caution: #b06c1e;
  --caution-bg: #f7ecdb;
  --risk: #a33a34;
  --risk-bg: #f6e5e3;
  --info: #35566f;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --max: 1180px;
  --shadow: 0 1px 2px rgba(18,22,28,.06), 0 16px 40px rgba(18,22,28,.08);
  --radius: 12px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.62;
  font-size: 17.5px;
  text-rendering: optimizeLegibility;
}
a { color: var(--ember-d); text-underline-offset: 2px; }
a:hover { color: var(--ink); }
img { max-width: 100%; height: auto; display: block; }
.skip {
  position: absolute; left: -999px; top: 0;
}
.skip:focus { left: 12px; top: 12px; background: #fff; padding: 8px 12px; z-index: 99; }

.topbar {
  background: var(--char);
  color: #d8d4cc;
  font-size: 12.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 9px 28px;
}
.topbar b { color: var(--ember); font-weight: 600; }

header.site {
  background: linear-gradient(180deg, var(--char-2), var(--char));
  color: #f4f1ea;
  border-bottom: 3px solid var(--ember);
}
header.site .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 22px 16px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
}
.brand { display: flex; gap: 14px; align-items: center; text-decoration: none; color: inherit; }
.brand img {
  width: 56px; height: 56px; border-radius: 14px;
  border: 1px solid rgba(255,255,255,.12);
}
.brand h1 {
  font-family: var(--serif);
  font-size: 1.45rem;
  margin: 0;
  letter-spacing: -.02em;
  font-weight: 700;
}
.brand p { margin: 2px 0 0; color: #b7b3aa; font-size: .86rem; }
.docket {
  font-size: .82rem;
  color: #b7b3aa;
  text-align: right;
  line-height: 1.45;
}
.docket b { color: var(--flame); display: block; font-weight: 600; }

nav.toc {
  background: #0e1218;
  border-bottom: 1px solid rgba(255,255,255,.06);
  position: sticky; top: 0; z-index: 20;
}
nav.toc .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 12px;
  display: flex; flex-wrap: wrap; gap: 2px;
}
nav.toc a {
  color: #c9c4ba;
  text-decoration: none;
  font-size: .86rem;
  padding: 12px 11px;
  border-bottom: 2px solid transparent;
}
nav.toc a:hover, nav.toc a[aria-current="page"] {
  color: #fff;
  border-bottom-color: var(--ember);
}

.hero {
  position: relative;
  min-height: 320px;
  background: #12161c center/cover no-repeat;
  color: #fff;
}
.hero .veil {
  background: linear-gradient(90deg, rgba(10,13,18,.82) 0%, rgba(10,13,18,.45) 55%, rgba(10,13,18,.2) 100%);
  min-height: 320px;
  display: flex;
  align-items: flex-end;
}
.hero .copy {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 22px 40px;
}
.kicker {
  color: var(--ember);
  letter-spacing: .16em;
  text-transform: uppercase;
  font-size: .75rem;
  font-weight: 700;
  margin: 0 0 10px;
}
.hero h2 {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 1.2rem + 2vw, 2.55rem);
  line-height: 1.18;
  margin: 0 0 12px;
  max-width: 18ch;
}
.hero p { max-width: 62ch; color: #e4dfd4; margin: 0; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 28px 22px 64px; }
.lede { font-size: 1.18rem; color: var(--ink); max-width: 72ch; }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 28px; }
.pill {
  font-size: .78rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  color: var(--muted);
}
.pill.risk { background: var(--risk-bg); color: var(--risk); border-color: transparent; }
.pill.good { background: var(--good-bg); color: var(--good); border-color: transparent; }
.pill.warn { background: var(--caution-bg); color: var(--caution); border-color: transparent; }

h2.sec {
  font-family: var(--serif);
  font-size: clamp(1.45rem, 1.1rem + 1.3vw, 2rem);
  margin: 2.2em 0 .4em;
  padding-top: .4em;
  border-top: 1px solid var(--line);
}
h3 { font-family: var(--serif); font-size: 1.22rem; margin: 1.5em 0 .4em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1.1em; padding-left: 1.2em; }
li { margin: .28em 0; }

.alert {
  background: var(--risk-bg);
  border-left: 4px solid var(--risk);
  padding: 16px 18px;
  border-radius: 0 10px 10px 0;
  margin: 0 0 28px;
}
.alert.warn { background: var(--caution-bg); border-left-color: var(--caution); }
.alert.info { background: #e8eef3; border-left-color: var(--info); }
.alert h3 { margin-top: 0; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin: 18px 0 28px;
}
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 16px 14px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  display: block;
}
a.card:hover { border-color: var(--ember); }
.card h3 { margin: 0 0 6px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card .tag {
  display: inline-block;
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ember-d);
  font-weight: 700;
  margin-bottom: 6px;
}

.tool {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
  margin: 8px 0 32px;
}
.tool h3 { margin-top: 0; }
.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 12px 0 18px;
}
label.ctl { display: flex; flex-direction: column; gap: 6px; font-size: .82rem; color: var(--muted); font-weight: 600; }
label.ctl select, label.ctl input {
  font: inherit;
  font-weight: 500;
  color: var(--ink);
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--paper);
}
.bars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.bar-row { display: grid; grid-template-columns: 90px 1fr 110px; gap: 10px; align-items: center; }
.bar-row .name { font-size: .88rem; font-weight: 700; }
.track { height: 22px; background: var(--paper-2); border-radius: 6px; overflow: hidden; }
.track > span { display: block; height: 100%; border-radius: 6px; }
.track .oil { background: var(--ember); }
.track .char { background: var(--charbar); }
.track .gas { background: var(--gas); }
.pct { font-family: var(--mono); font-size: .86rem; color: var(--muted); }
.tool .note { font-size: .9rem; color: var(--muted); margin: 14px 0 0; }

.table-wrap {
  overflow-x: auto;
  margin: 12px 0 28px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
  min-width: 720px;
}
th, td {
  text-align: left;
  padding: 9px 11px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th {
  background: var(--char);
  color: #f4f1ea;
  font-weight: 600;
  font-size: .78rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  position: sticky; top: 0;
}
tr:nth-child(even) td { background: #faf7f1; }
td.num { font-family: var(--mono); white-space: nowrap; }
.filter-row {
  display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 12px;
}
.filter-row button {
  font: inherit;
  font-size: .84rem;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 999px;
  padding: 5px 12px;
  cursor: pointer;
}
.filter-row button[aria-pressed="true"], .filter-row button:hover {
  background: var(--char);
  color: #fff;
  border-color: var(--char);
}

.faq details {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 14px;
  margin: 0 0 8px;
}
.faq summary { cursor: pointer; font-weight: 700; }
.faq details p { margin: .6em 0 0; color: var(--muted); }

.cite {
  font-size: .88rem;
  color: var(--muted);
}
.cite a { color: var(--info); }
ol.sources { font-size: .92rem; }
ol.sources li { margin: .45em 0; }

footer.site {
  background: var(--char);
  color: #c9c4ba;
  padding: 28px 22px 40px;
  font-size: .9rem;
}
footer.site .inner { max-width: var(--max); margin: 0 auto; }
footer.site a { color: #f4b942; }
footer.site nav { display: flex; flex-wrap: wrap; gap: 14px; margin: 10px 0 16px; }
.fine { color: #8d8880; font-size: .82rem; }

.stack { display: flex; height: 14px; border-radius: 7px; overflow: hidden; background: var(--paper-2); }
.stack i { display: block; height: 100%; }
.legend { display: flex; gap: 14px; font-size: .82rem; color: var(--muted); margin: 8px 0 16px; }
.legend span::before {
  content: "";
  display: inline-block;
  width: 10px; height: 10px; border-radius: 2px; margin-right: 6px;
}
.legend .l-oil::before { background: var(--ember); }
.legend .l-char::before { background: var(--charbar); }
.legend .l-gas::before { background: var(--gas); }

.two {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 22px;
  align-items: start;
}
@media (max-width: 860px) {
  header.site .inner { grid-template-columns: 1fr; }
  .docket { text-align: left; }
  .two { grid-template-columns: 1fr; }
  .bar-row { grid-template-columns: 70px 1fr 90px; }
}