/* Carbon Ledger - "Field Ledger" visual system. Tokens and rules: design/STYLE_GUIDE.md.
   Fonts are self-hosted (SIL OFL 1.1, licences in assets/fonts/). No third-party origins. */

@font-face {
  font-family: "Newsreader";
  src: url("fonts/newsreader-latin-display.woff2") format("woff2");
  font-weight: 400 650;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("fonts/ibm-plex-sans-latin.woff2") format("woff2");
  font-weight: 100 700;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light;
  --paper: #f4f0e6;
  --surface: #fbf9f4;
  --ink: #13201a;
  --slate: #56645e;
  --muted: #636e68;
  --fern: #1f5c45;
  --fern-text: #f4f0e6;
  --verdigris: #008a76;
  --ember: #d4592a;
  --neutral-bar: #b9b4a6;
  --hairline: #e3ded2;
  --axis: #c9c2b2;
  --critical: #c2362f;
  --warning: #b57f0c;
  --good: #2e7d32;
  --wash: rgba(19, 32, 26, 0.04);
  --tip-bg: #13201a;
  --tip-ink: #f4f0e6;

  --display: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "Cascadia Code", Consolas, monospace;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #0f1512;
    --surface: #151c19;
    --ink: #eceee8;
    --slate: #a9b5ae;
    --muted: #84918a;
    --fern: #7fc4a4;
    --fern-text: #0f1512;
    --verdigris: #1fa38d;
    --ember: #e0703a;
    --neutral-bar: #4c5852;
    --hairline: #26302b;
    --axis: #3a4640;
    --critical: #ef6a5f;
    --warning: #e0b04a;
    --good: #6fc27a;
    --wash: rgba(236, 238, 232, 0.05);
    --tip-bg: #eceee8;
    --tip-ink: #0f1512;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0f1512;
  --surface: #151c19;
  --ink: #eceee8;
  --slate: #a9b5ae;
  --muted: #84918a;
  --fern: #7fc4a4;
  --fern-text: #0f1512;
  --verdigris: #1fa38d;
  --ember: #e0703a;
  --neutral-bar: #4c5852;
  --hairline: #26302b;
  --axis: #3a4640;
  --critical: #ef6a5f;
  --warning: #e0b04a;
  --good: #6fc27a;
  --wash: rgba(236, 238, 232, 0.05);
  --tip-bg: #eceee8;
  --tip-ink: #0f1512;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.55 var(--sans);
  font-feature-settings: "kern";
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 72rem; margin: 0 auto; padding: 0 24px; }
@media (max-width: 560px) { .wrap { padding: 0 16px; } }

a { color: var(--fern); text-underline-offset: 3px; }
code { font-family: var(--mono); font-size: .875em; }
:focus-visible { outline: 3px solid var(--fern); outline-offset: 2px; border-radius: 4px; }

.skip { position: absolute; left: -999px; top: 8px; }
.skip:focus { left: 16px; background: var(--surface); color: var(--ink); padding: 8px 12px; z-index: 10; }

/* ---------- masthead ---------- */
.masthead {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}
.bar { display: flex; align-items: center; gap: 24px; min-height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.brand img { display: block; border-radius: 7px; }
.brand-name { font: 600 1.125rem/1 var(--display); letter-spacing: -.01em; }
.brand-name span { color: var(--slate); font-weight: 500; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  color: var(--slate); text-decoration: none; font-size: .9375rem; font-weight: 500;
  padding: 6px 10px; border-radius: 6px;
}
.nav a:hover { color: var(--ink); background: var(--wash); }
@media (max-width: 760px) { .nav { display: none; } .theme-toggle { margin-left: auto; } }

.theme-toggle {
  display: inline-flex; align-items: center; gap: 6px;
  font: 500 .875rem/1 var(--sans); color: var(--slate);
  background: transparent; border: 1px solid var(--hairline); border-radius: 6px;
  min-height: 36px; padding: 0 10px; cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--axis); }
.icon { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- hero ---------- */
.hero { padding: 72px 24px 40px; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 48px; align-items: end; }
@media (max-width: 900px) { .hero { grid-template-columns: 1fr; gap: 32px; padding-top: 48px; } }
.kicker, .label-caps {
  margin: 0 0 12px; font: 600 .75rem/1.2 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--fern);
}
h1 {
  margin: 0 0 20px; font: 500 clamp(2.4rem, 5.2vw, 4rem)/1.04 var(--display); letter-spacing: -.02em; max-width: 14ch;
}
.lede { margin: 0; max-width: 40rem; color: var(--slate); font-size: 1.0625rem; }

.hero-figure {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: 10px; padding: 28px 28px 24px;
}
.hero-figure .figure-label { margin: 0; color: var(--slate); font-size: .9375rem; }
.big-number { margin: 6px 0 4px; font: 500 clamp(3rem, 7vw, 4.75rem)/1 var(--display); letter-spacing: -.02em; }
.big-number .unit { font: 500 1.125rem/1 var(--sans); color: var(--slate); letter-spacing: 0; margin-left: 8px; }
.meta { list-style: none; margin: 16px 0 0; padding: 16px 0 0; border-top: 1px solid var(--hairline); display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 16px; font-size: .875rem; }
.meta li { display: grid; gap: 1px; }
.meta .k { color: var(--muted); font-size: .8125rem; }
.meta .v { font-variant-numeric: tabular-nums; font-weight: 500; }
.provenance { margin: 14px 0 0; font-size: .8125rem; color: var(--muted); display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.tag {
  display: inline-flex; align-items: center; gap: 5px; font: 600 .6875rem/1 var(--sans); letter-spacing: .06em; text-transform: uppercase;
  border: 1px solid var(--axis); color: var(--slate); border-radius: 999px; padding: 4px 8px;
}

/* ---------- sections ---------- */
.section { padding: 56px 0 8px; }
.section + .section { border-top: 1px solid var(--hairline); }
.section-head { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 24px; align-items: end; margin-bottom: 24px; }
h2 { margin: 0; font: 500 clamp(1.6rem, 3vw, 2.1rem)/1.15 var(--display); letter-spacing: -.015em; }
.section-note { margin: 6px 0 0; color: var(--slate); max-width: 44rem; }
h3 { margin: 0 0 4px; font: 600 1rem/1.3 var(--sans); }
.chart-sub { margin: 0 0 12px; color: var(--slate); font-size: .875rem; }

.panel { background: var(--surface); border: 1px solid var(--hairline); border-radius: 10px; padding: 20px 20px 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(20rem, 100%), 1fr)); gap: 16px; }
.stack { display: grid; gap: 16px; }

.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(11rem, 100%), 1fr)); gap: 0; margin-bottom: 16px;
  background: var(--surface); border: 1px solid var(--hairline); border-radius: 10px; }
.kpi { padding: 16px 20px; border-right: 1px solid var(--hairline); }
.kpi:last-child { border-right: 0; }
.kpi .label { margin: 0; color: var(--slate); font-size: .8125rem; }
.kpi .value { margin: 4px 0 2px; font: 500 1.75rem/1.1 var(--display); letter-spacing: -.01em; }
.kpi .value .unit { font: 500 .875rem/1 var(--sans); color: var(--slate); margin-left: 4px; }
.kpi .note { margin: 0; color: var(--muted); font-size: .8125rem; }

.muted { color: var(--muted); }
.empty { padding: 28px; text-align: center; color: var(--slate); border: 1px dashed var(--axis); border-radius: 10px; }
.ok-line { display: flex; gap: 10px; align-items: center; margin: 16px 0 0; font-weight: 500; }
.ok-line .icon { color: var(--good); }

/* ---------- charts ---------- */
.chart { position: relative; width: 100%; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart text { font-family: var(--sans); fill: var(--slate); font-size: 12.5px; }
.chart .t-label { fill: var(--ink); font-size: 13px; }
.chart .t-sub { fill: var(--muted); font-size: 11.5px; }
.chart .t-value { fill: var(--ink); font-size: 12.5px; font-weight: 500; font-variant-numeric: tabular-nums; }
.chart .t-tick { fill: var(--muted); font-size: 11.5px; font-variant-numeric: tabular-nums; }
.chart .t-tag { fill: var(--slate); font-size: 11px; font-weight: 600; letter-spacing: .04em; }
.chart .grid { stroke: var(--hairline); stroke-width: 1; shape-rendering: crispEdges; }
.chart .baseline { stroke: var(--axis); stroke-width: 1; shape-rendering: crispEdges; }
.chart .threshold { stroke: var(--ink); stroke-width: 2; }
.chart .hit { fill: transparent; cursor: default; }
.chart .row:hover .hit, .chart .row:focus .hit { fill: var(--wash); }
.chart .row:focus { outline: none; }
.chart .row:focus-visible .hit { stroke: var(--fern); stroke-width: 2; }
.bar-now { fill: var(--ember); }
.bar-after { fill: var(--verdigris); }
.bar-neutral { fill: var(--neutral-bar); }
.bar-series { fill: var(--verdigris); }
.bar-focus { fill: var(--ember); }
.chart .bar { transform-box: fill-box; transform-origin: left center; animation: grow 520ms var(--ease) both; }
@keyframes grow { from { transform: scaleX(0); } to { transform: scaleX(1); } }

.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 0 0 12px; padding: 0; list-style: none; font-size: .875rem; color: var(--slate); }
.legend li { display: inline-flex; align-items: center; gap: 8px; }
.swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.swatch.now { background: var(--ember); }
.swatch.after { background: var(--verdigris); }
.swatch.neutral { background: var(--neutral-bar); }

.tooltip {
  position: absolute; z-index: 4; pointer-events: none; min-width: 160px; max-width: 280px;
  background: var(--tip-bg); color: var(--tip-ink); border-radius: 8px; padding: 10px 12px;
  font-size: .8125rem; line-height: 1.45; opacity: 0; transform: translateY(4px);
  transition: opacity 120ms var(--ease), transform 120ms var(--ease);
}
.tooltip.show { opacity: 1; transform: none; }
.tooltip strong { display: block; font-weight: 600; margin-bottom: 2px; }
.tooltip .tip-row { display: flex; justify-content: space-between; gap: 16px; font-variant-numeric: tabular-nums; }
.tooltip .tip-row span:first-child { opacity: .72; }

details.table-view { margin-top: 12px; }
details.table-view summary { cursor: pointer; color: var(--slate); font-size: .875rem; font-weight: 500; width: max-content; padding: 4px 0; }
details.table-view summary:hover { color: var(--ink); }
.table-wrap { overflow-x: auto; margin-top: 8px; }
table { width: 100%; border-collapse: collapse; font-size: .875rem; }
caption { text-align: left; color: var(--slate); padding: 0 0 8px; font-weight: 500; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--hairline); }
th { font-weight: 600; color: var(--slate); font-size: .8125rem; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- audit ---------- */
.audit-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; margin: 0 0 16px; color: var(--slate); font-size: .875rem; }
.audit-meta code { color: var(--ink); background: var(--wash); padding: 2px 6px; border-radius: 4px; }
.bullet-legend { display: flex; justify-content: space-between; color: var(--muted); font-size: .8125rem; margin-top: 4px; }

.findings { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--hairline); }
.finding { border-bottom: 1px solid var(--hairline); }
.finding details > summary {
  list-style: none; cursor: pointer; display: grid; grid-template-columns: 112px minmax(0, 1fr) minmax(120px, 28%) 20px; gap: 16px; align-items: center; padding: 14px 4px;
}
.finding details > summary::-webkit-details-marker { display: none; }
.finding details > summary:hover { background: var(--wash); }
.finding .f-title { font-weight: 500; }
.finding .f-jobs { display: block; color: var(--muted); font-size: .8125rem; font-weight: 400; margin-top: 2px; }
.finding .chev { color: var(--muted); transition: transform 160ms var(--ease); }
.finding details[open] .chev { transform: rotate(90deg); }
.finding .f-body { padding: 0 4px 18px 132px; color: var(--slate); }
.finding .f-body p { margin: 0 0 10px; max-width: 46rem; }
.finding pre { margin: 0; background: var(--paper); border: 1px solid var(--hairline); border-radius: 6px; padding: 12px 14px; overflow-x: auto; color: var(--ink); font-size: .8125rem; line-height: 1.5; }
@media (max-width: 700px) {
  .finding details > summary { grid-template-columns: minmax(0, 1fr) 20px; }
  .finding .sev { grid-column: 1 / -1; }
  .finding .saving { grid-column: 1 / 2; }
  .finding .f-body { padding-left: 4px; }
}
.saving { display: grid; gap: 4px; }
.saving .s-track { height: 8px; background: var(--wash); border-radius: 4px; overflow: hidden; }
.saving .s-fill { display: block; height: 100%; background: var(--ember); border-radius: 0 4px 4px 0; transform-origin: left; animation: grow 520ms var(--ease) both; }
.saving .s-text { font-size: .8125rem; color: var(--slate); font-variant-numeric: tabular-nums; }

.sev { display: inline-flex; align-items: center; gap: 6px; font: 600 .6875rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ink); }
.sev .dot { width: 18px; height: 18px; border-radius: 50%; display: inline-grid; place-items: center; color: var(--surface); font-size: .75rem; letter-spacing: 0; }
.sev-high .dot { background: var(--critical); }
.sev-medium .dot { background: var(--warning); }
.sev-low .dot { background: var(--muted); }

/* ---------- calculator ---------- */
.calc { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1fr) minmax(0, 1.4fr) auto; gap: 12px; align-items: end; }
@media (max-width: 860px) { .calc { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .calc { grid-template-columns: 1fr; } }
.field { display: grid; gap: 6px; min-width: 0; }
label { font-weight: 600; font-size: .875rem; }
input, select, button { font: inherit; min-height: 44px; }
input, select {
  width: 100%; padding: 8px 12px; border-radius: 6px; border: 1px solid var(--axis); background: var(--surface); color: var(--ink);
}
input:hover, select:hover { border-color: var(--slate); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 20px; border-radius: 6px;
  background: var(--fern); color: var(--fern-text); border: 1px solid var(--fern); font-weight: 600; cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.result { margin: 24px 0 8px; min-height: 1.5em; color: var(--slate); max-width: 52rem; }
.result strong { color: var(--ink); font-weight: 600; }
.calc-figure { display: flex; align-items: baseline; gap: 10px; margin: 20px 0 0; }
.calc-figure .big-number { margin: 0; font-size: clamp(2.4rem, 5vw, 3.4rem); }

/* ---------- footer ---------- */
.foot { margin-top: 64px; border-top: 1px solid var(--hairline); padding: 32px 0 48px; color: var(--slate); font-size: .875rem; }
.foot-grid { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: 24px; }
@media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr; } }
.foot p { margin: 0 0 8px; max-width: 46rem; }
.foot .brand-name { color: var(--ink); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

@media (forced-colors: active) {
  .bar-now, .bar-after, .bar-neutral, .bar-series, .bar-focus { fill: CanvasText; }
  .swatch, .saving .s-fill { background: CanvasText; }
}

@media print {
  .masthead, .theme-toggle, .calc { display: none; }
  body { background: #fff; }
}

.audit-projection { margin-top: 16px; }
.audit-projection .kpis { margin-bottom: 0; }
.findings-head { margin: 40px 0 12px; }
.tooltip.measure { opacity: 0; display: block; }
.recommend { margin-top: 24px; }
.recommend-list { margin: 0; padding-left: 1.25rem; color: var(--slate); max-width: 52rem; }
.recommend-list strong { color: var(--ink); font-weight: 600; }