/* Plugging Index. Design language shared with hubstake.io (paper background, ink and steel type, 1px rules,
   4-8px radii, almost no elevation); the accent is Plugging Index's own petroleum teal. See reports/design_notes.md. */
@font-face { font-family: "Inter"; src: url("/fonts/inter.woff2") format("woff2"); font-weight: 100 900; font-style: normal; font-display: swap; }
@font-face { font-family: "Inter Tight"; src: url("/fonts/inter-tight.woff2") format("woff2"); font-weight: 100 900; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("/fonts/ibm-plex-mono-400.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("/fonts/ibm-plex-mono-500.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }

:root {
  /* paper, ink and steel: same values as Hubstake */
  --bg: #F7F7F4; --surface: #FFFFFF; --surface-2: #F1F1ED; --surface-3: #E7E7E2; --line: #E7E7E2; --line-soft: #EFEFEA;
  --graphite: #111820; --graphite-2: #1B242E; --ink: #111820; --ink-2: #3B4650; --ink-3: #5C6872;
  /* petroleum teal: links, buttons, chart marks, grade badges */
  --accent: #0E6B6B; --accent-600: #0B5A5A; --accent-700: #084747; --accent-soft: #7DB8B4; --accent-wash: #E4F1F0;
  --accent-line: #B5D8D5; --accent-ring: rgba(14, 107, 107, .30); --on-accent: #FFFFFF; --accent-on-dark: #8FD3CE;
  --warn: #8A4F00; --warn-wash: #FBF1DF; --warn-line: #E3BE7A; --neg: #A8331F; --ok: #1F6B4A;
  --map-none: #F1F1ED; --map-thin: #D3D3CB;
  --radius: 8px; --radius-sm: 5px; --radius-xs: 3px; --maxw: 1180px; --gut: clamp(16px, 4vw, 40px);
  --shadow: 0 1px 2px rgba(17, 24, 32, .05);
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --display: "Inter Tight", "Inter", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink-2); font-family: var(--sans); font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
a { color: var(--accent); text-underline-offset: 2px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-700); }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut); }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* header */
header.site { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
header.site .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 24px; padding-top: 12px; padding-bottom: 12px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font: 700 1.12rem/1 var(--display); letter-spacing: -.02em; color: var(--ink); text-decoration: none; }
.logo svg { width: 26px; height: 26px; flex: none; }
.logo:hover { color: var(--ink); }
nav.main { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 20px; margin-left: auto; font-size: .875rem; }
nav.main a { color: var(--ink-2); text-decoration: none; padding: 6px 0; border-bottom: 2px solid transparent; font-weight: 500; }
nav.main a:hover { color: var(--ink); }
nav.main a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }
nav.main a.btn { color: var(--on-accent); padding: .5rem .9rem; border: 0; }
.preview-banner { background: var(--warn-wash); color: var(--warn); font-size: .8rem; padding: 6px 0; border-bottom: 1px solid var(--warn-line); }

/* type */
main { padding: 0 0 4rem; }
main > .wrap { padding-top: 2.4rem; }
h1, h2, h3 { font-family: var(--display); color: var(--ink); line-height: 1.15; margin: 0; }
h1 { font-size: clamp(1.85rem, 1.35rem + 1.7vw, 2.6rem); letter-spacing: -.024em; font-weight: 720; margin-bottom: .6rem; overflow-wrap: anywhere; }
h2 { font-size: clamp(1.3rem, 1.1rem + .7vw, 1.6rem); letter-spacing: -.02em; font-weight: 700; margin: 3rem 0 .8rem; }
h3 { font-size: 1.06rem; font-weight: 650; margin: 1.6rem 0 .4rem; }
p { margin: 0 0 .8rem; max-width: 72ch; overflow-wrap: break-word; }
main p a, main li a { overflow-wrap: anywhere; }
ul { max-width: 76ch; padding-left: 1.2rem; }
li { margin-bottom: .35rem; }
.lede { font-size: 1.08rem; color: var(--ink-2); max-width: 66ch; }
.meta { font-size: .82rem; color: var(--ink-3); }
.eyebrow { font-size: .74rem; font-weight: 670; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 .5rem; }
.eyebrow::before { content: ""; display: inline-block; width: 14px; height: 2px; background: var(--accent); vertical-align: middle; margin-right: 8px; }

/* cards, grids, stats */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.3rem 1.35rem; box-shadow: var(--shadow); }
.grid { display: grid; gap: 16px; }
.grid.k3 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.grid.k2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.stat .label { font-size: .72rem; font-weight: 650; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.stat .value { font: 500 1.75rem/1.2 var(--mono); font-variant-numeric: tabular-nums; color: var(--ink); margin: 6px 0 4px; letter-spacing: -.02em; overflow-wrap: anywhere; }
.stat .sub { font-size: .82rem; color: var(--ink-3); }

/* grade badges: A solid accent, B accent wash, insufficient neutral */
.grade { display: inline-block; min-width: 24px; text-align: center; font: 700 .72rem/20px var(--sans); letter-spacing: .04em; border-radius: var(--radius-xs); padding: 0 6px; vertical-align: 1px; border: 1px solid transparent; }
.grade.A { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.grade.B { background: var(--accent-wash); color: var(--accent-700); border-color: var(--accent-line); }
.insufficient { display: inline-block; font: 600 .72rem/20px var(--sans); color: var(--ink-3); background: var(--surface-2); border: 1px solid var(--surface-3); border-radius: var(--radius-xs); padding: 0 7px; white-space: nowrap; }

/* tables */
.table-scroll { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: .875rem; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
tbody tr:last-child td { border-bottom: 0; }
th { font-size: .7rem; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); font-weight: 650; white-space: nowrap; background: var(--surface-2); border-bottom: 1px solid var(--line); }
td.num, th.num { text-align: right; white-space: nowrap; }
td.num { font-family: var(--mono); font-size: .84rem; color: var(--ink); }
tbody tr:hover { background: var(--accent-wash); }
td a { font-weight: 550; }

.note { background: var(--warn-wash); color: var(--warn); border: 1px solid var(--warn-line); border-left-width: 3px; border-radius: var(--radius-sm); padding: 10px 14px; font-size: .875rem; margin: 14px 0; max-width: 78ch; }
.note a { color: inherit; }

/* charts */
figure { margin: 16px 0; }
figure .chart { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 10px 8px; position: relative; overflow-x: auto; }
figcaption { font-size: .8rem; color: var(--ink-3); margin-top: 6px; max-width: 80ch; }
svg.chart-svg { display: block; width: 100%; min-width: 600px; height: auto; font: 12px var(--sans); }
svg .axis { stroke: var(--surface-3); stroke-width: 1; }
svg .gridline { stroke: var(--line); stroke-width: 1; stroke-dasharray: 2 3; }
svg text { fill: var(--ink-3); }
svg text.lbl { fill: var(--ink-2); }
svg text.val { fill: var(--ink); font-weight: 600; font-family: var(--mono); }
svg .line { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linejoin: round; }
svg .dot { fill: var(--accent); stroke: var(--surface); stroke-width: 2; }
svg .dot.b { fill: var(--surface); stroke: var(--accent); }
svg .bar { fill: var(--accent); }
svg .range { fill: var(--accent-line); }
svg .iqr { fill: var(--accent); }
svg .median { stroke: var(--ink); stroke-width: 2; }
svg .hit { fill: transparent; cursor: default; }
svg .gap { fill: var(--ink-3); }
.tip { position: absolute; pointer-events: none; background: var(--graphite); color: #fff; font-size: .75rem; line-height: 1.4; padding: 6px 8px; border-radius: var(--radius-xs); white-space: pre-line; z-index: 5; max-width: 240px; display: none; }

/* forms and buttons */
form .row { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); margin-bottom: 12px; }
label { display: block; font-size: .8rem; font-weight: 600; color: var(--ink-2); margin-bottom: 4px; }
label .opt { font-weight: 400; color: var(--ink-3); }
input, select, textarea { width: 100%; font: inherit; font-size: .95rem; color: var(--ink); background: var(--surface); border: 1px solid var(--surface-3); border-radius: var(--radius-sm); padding: .6rem .7rem; }
input:focus, select:focus, textarea:focus { outline: 0; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-ring); }
a:focus-visible, button:focus-visible, .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
textarea { min-height: 96px; resize: vertical; }
button, .btn { display: inline-flex; align-items: center; gap: .45rem; font: 600 .92rem/1.2 var(--sans); background: var(--accent); color: var(--on-accent); border: 1px solid var(--accent); border-radius: var(--radius-sm); padding: .68rem 1.1rem; cursor: pointer; text-decoration: none; }
button:hover, .btn:hover { background: var(--accent-600); border-color: var(--accent-600); color: var(--on-accent); }
.btn.secondary { background: var(--surface); color: var(--ink); border-color: var(--surface-3); }
.btn.secondary:hover { background: var(--surface-2); color: var(--ink); }
.hp { position: absolute; left: -9999px; }
.result { margin-top: 18px; }
.result .range { font: 500 1.9rem/1.2 var(--mono); color: var(--ink); letter-spacing: -.02em; }
.result dl { display: grid; grid-template-columns: max-content 1fr; gap: 5px 18px; font-size: .875rem; margin: 12px 0 0; }
.result dt { color: var(--ink-3); }
.result dd { margin: 0; color: var(--ink); }
.formmsg { margin-top: 12px; font-size: .875rem; font-weight: 550; }
.formmsg.ok { color: var(--ok); }
.formmsg.err { color: var(--neg); }

/* home: hero */
.hero { background: var(--graphite); color: #C9D1D8; padding: clamp(2.4rem, 5vw, 4.2rem) 0; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: clamp(24px, 4vw, 56px); align-items: center; }
.hero-eyebrow { margin: 0 0 16px; font-size: .75rem; font-weight: 650; letter-spacing: .14em; text-transform: uppercase; color: var(--accent-on-dark); }
.hero h1 { color: #fff; font-size: clamp(2.1rem, 1.3rem + 3vw, 3.3rem); max-width: 16ch; margin-bottom: 1rem; }
.hero .lede { color: #C9D1D8; font-size: 1.12rem; max-width: 46ch; }
.hero-card { background: var(--surface); border-radius: var(--radius); padding: 1.3rem; color: var(--ink-2); box-shadow: 0 2px 4px rgba(0, 0, 0, .2), 0 14px 34px rgba(0, 0, 0, .25); }
.hero-card h2 { margin: 0 0 .8rem; font-size: 1.05rem; }
.hero-card form .row { grid-template-columns: 1fr 1fr; }
.hero-card button { width: 100%; justify-content: center; }
.hero-card .meta { margin: .7rem 0 0; }

/* home: stats band */
.stats-band { background: var(--accent-700); color: #fff; }
.stats-band dl { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0; }
.stats-band div { padding: 1.3rem 1rem 1.2rem 0; }
.stats-band div + div { padding-left: 1.2rem; border-left: 1px solid rgba(255, 255, 255, .16); }
.stats-band dd { margin: 0; font: 500 clamp(1.3rem, 1rem + 1.2vw, 1.85rem)/1.15 var(--mono); letter-spacing: -.02em; }
.stats-band dt { font-size: .74rem; font-weight: 600; letter-spacing: .07em; text-transform: uppercase; color: #C4E3E0; margin-top: 4px; }

/* home: bands and sections */
.band-white { background: var(--surface); border-bottom: 1px solid var(--line); }
.section { padding-top: 3.2rem; padding-bottom: 3.2rem; }
.section > h2:first-child, .section > .eyebrow + h2 { margin-top: 0; }
.example { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(20px, 4vw, 48px); align-items: center; }
.example h2 { margin: 0 0 .6rem; }
.example-card { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.example-card > div { padding: 1.4rem; }
.example-card > div + div { background: var(--surface-2); border-left: 1px solid var(--line); }
.example-card .label { display: block; font-size: .72rem; font-weight: 650; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.example-card h3 { margin: .3rem 0 .9rem; font-size: 1.2rem; }
.example-card .figure { font: 500 2.3rem/1.1 var(--mono); color: var(--ink); letter-spacing: -.03em; }
.example-card .per { font-size: .9rem; color: var(--ink-3); margin-left: 6px; }
.rangebar { position: relative; height: 10px; margin: 16px 0 6px; }
.rangebar .track { position: absolute; inset: 3px 0; background: var(--surface-3); border-radius: 2px; }
.rangebar .span { position: absolute; top: 0; bottom: 0; background: var(--accent-line); border-radius: 3px; }
.rangebar .iqr { position: absolute; top: 0; bottom: 0; background: var(--accent); border-radius: 2px; }
.rangebar .med { position: absolute; top: -4px; bottom: -4px; width: 2px; background: var(--ink); }
.ends { display: flex; justify-content: space-between; font: 400 .76rem var(--mono); color: var(--ink-3); }
.facts { list-style: none; padding: 0; margin: 0; font-size: .875rem; }
.facts li { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--line); margin: 0; }
.facts li:last-child { border-bottom: 0; }
.facts span:last-child { color: var(--ink); font-weight: 550; text-align: right; }
.receipt { display: inline-flex; align-items: center; gap: .3rem; font-size: .8rem; font-weight: 600; color: var(--accent-700); background: var(--accent-wash); border: 1px solid var(--accent-line); padding: .25rem .55rem; border-radius: var(--radius-xs); text-decoration: none; margin-top: .9rem; }
.receipt:hover { background: #D6EAE8; }

.flow { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.flowstep { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem 1.35rem; box-shadow: var(--shadow); }
.flowstep .fn { font: 500 .8rem var(--mono); color: var(--accent); letter-spacing: .04em; }
.flowstep h3 { margin: .3rem 0 .35rem; }
.flowstep p { margin: 0; font-size: .92rem; }

.covband h2 { margin-top: 0; }
.covband { display: grid; grid-template-columns: minmax(0, .75fr) minmax(0, 1.25fr); gap: clamp(20px, 4vw, 48px); align-items: center; }
.usmap svg { display: block; width: 100%; height: auto; }
.usmap path { stroke: #8A929A; stroke-width: .7; }
.usmap a:hover path, .usmap a:focus path { stroke: var(--ink); stroke-width: 1.5; }
.usmap .m-a { fill: var(--accent); } .usmap .m-b { fill: var(--accent-soft); } .usmap .m-thin { fill: var(--map-thin); } .usmap .m-none { fill: var(--map-none); }
.legend { display: flex; flex-wrap: wrap; gap: 8px 18px; list-style: none; padding: 0; margin: 14px 0 0; font-size: .82rem; color: var(--ink-2); }
.legend li { display: inline-flex; align-items: center; gap: 7px; margin: 0; }
.legend i { width: 14px; height: 14px; border-radius: 3px; display: inline-block; border: 1px solid rgba(17, 24, 32, .12); }

.props { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.prop { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 22px; box-shadow: var(--shadow); }
a.prop { color: var(--ink-2); display: block; }
a.prop:hover { border-color: var(--accent-line); color: var(--ink-2); }
.prop h3 { margin: 0 0 .4rem; }
.prop p { margin: 0; font-size: .92rem; }
.prop .who { font: 500 .74rem var(--mono); color: var(--accent); letter-spacing: .04em; text-transform: uppercase; }

/* footer */
footer.site { background: var(--graphite); color: #9AA5AE; padding: 40px 0 36px; font-size: .86rem; margin-top: 0; }
footer.site a { color: #D5DBE0; text-decoration: none; }
footer.site a:hover { color: #fff; text-decoration: underline; }
.foot-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) repeat(4, minmax(0, 1fr)); gap: 28px; }
.foot-brand { font: 700 1.05rem var(--display); color: #fff; letter-spacing: -.02em; }
.foot-grid h4 { margin: 0 0 .6rem; font: 650 .72rem var(--sans); letter-spacing: .09em; text-transform: uppercase; color: #C9D1D8; }
.foot-grid ul { list-style: none; padding: 0; margin: 0; }
.foot-grid li { margin: 0 0 .35rem; }
.foot-legal { border-top: 1px solid rgba(255, 255, 255, .12); margin-top: 26px; padding-top: 16px; font-size: .8rem; max-width: none; }
ul.plain { list-style: none; padding: 0; margin: 0; columns: 3 180px; }
ul.plain li { padding: 3px 0; break-inside: avoid; }

@media (max-width: 900px) {
  .hero .wrap, .example, .covband { grid-template-columns: 1fr; }
  .props { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .stats-band dl { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats-band div:nth-child(3) { padding-left: 0; border-left: 0; }
  .stats-band div:nth-child(n+3) { border-top: 1px solid rgba(255, 255, 255, .16); }
}
@media (max-width: 600px) {
  header.site { position: static; }
  nav.main { margin-left: 0; gap: 2px 16px; }
  .flow, .example-card, .props { grid-template-columns: 1fr; }
  .example-card > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .hero-card form .row { grid-template-columns: 1fr; }
  th, td { padding: 8px 9px; }
  .result .range { font-size: 1.45rem; }
  .stat .value { font-size: 1.45rem; }
}
@media print {
  header.site nav, footer.site .foot-grid, .preview-banner, .noprint { display: none !important; }
  body { background: #fff; font-size: 10.5pt; }
  header.site { position: static; border-bottom: 1px solid #000; }
  footer.site { background: #fff; color: #333; padding: 12px 0; } .foot-legal { border: 0; margin: 0; padding: 0; }
  main > .wrap { padding-top: 1rem; } h2 { break-after: avoid; margin-top: 1.6rem; }
  figure, table, .card { break-inside: avoid; } svg.chart-svg { min-width: 0; }
  a { color: #000; text-decoration: none; }
}