/* jev-gc report page.
   Hand-written, no framework, no JavaScript. Served by GitHub Pages from
   /docs. The page is dense with tables and verbatim program output, so the
   type system is built around three jobs: prose you can read at length,
   numbers you can compare down a column, and output you can trust is
   verbatim. */

:root {
  --bg: #fbfaf8;
  --surface: #ffffff;
  --surface-alt: #f4f2ee;
  --text: #1c1b19;
  --text-muted: #5f5b54;
  --text-faint: #8a857c;
  --rule: #e2ded6;
  --rule-strong: #c9c3b8;
  --accent: #8a3324;
  --accent-soft: #f5e9e5;
  --hot: #a33a22;
  --warm: #9a6b1f;
  --cold: #3f6b8a;
  --ok: #3d6b47;
  --mono-bg: #f4f2ee;
  --shadow: rgba(28, 27, 25, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14130f;
    --surface: #1b1a16;
    --surface-alt: #211f1a;
    --text: #eae6dd;
    --text-muted: #a9a398;
    --text-faint: #7d776c;
    --rule: #2f2c26;
    --rule-strong: #453f36;
    --accent: #e08a70;
    --accent-soft: #2a201c;
    --hot: #e08a70;
    --warm: #d6a850;
    --cold: #7fb0d0;
    --ok: #7fb98a;
    --mono-bg: #211f1a;
    --shadow: rgba(0, 0, 0, 0.4);
  }
}

:root[data-theme="dark"] {
  --bg: #14130f;
  --surface: #1b1a16;
  --surface-alt: #211f1a;
  --text: #eae6dd;
  --text-muted: #a9a398;
  --text-faint: #7d776c;
  --rule: #2f2c26;
  --rule-strong: #453f36;
  --accent: #e08a70;
  --accent-soft: #2a201c;
  --hot: #e08a70;
  --warm: #d6a850;
  --cold: #7fb0d0;
  --ok: #7fb98a;
  --mono-bg: #211f1a;
  --shadow: rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "IBM Plex Serif", Georgia, "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.62;
  font-feature-settings: "kern" 1;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 47rem;
  margin: 0 auto;
  padding: 0 16px 6rem;
}

/* ---- masthead ---------------------------------------------------------- */

header.masthead {
  border-bottom: 1px solid var(--rule);
  margin-bottom: 3rem;
  padding: 3.5rem 0 2.25rem;
}

.eyebrow {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 1rem;
}

h1 {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: clamp(1.9rem, 5.2vw, 2.7rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1.1rem;
  text-wrap: balance;
}

.standfirst {
  font-size: 1.16rem;
  color: var(--text-muted);
  margin: 0 0 1.75rem;
  max-width: 38rem;
}

.meta {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.83rem;
  color: var(--text-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.meta a {
  color: var(--accent);
}

/* ---- side navigation ---------------------------------------------------
   Collapsible with no JavaScript: a visually hidden checkbox holds the open
   state and sibling selectors do the rest. The checkbox means "toggled away
   from this breakpoint's default" rather than a fixed open/closed, because
   the sensible default differs -- open beside the text on a wide screen,
   closed behind a button on a phone. */

.nav-state {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.nav-button {
  position: fixed;
  top: 0.9rem;
  left: 0.9rem;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  box-shadow: 0 1px 3px var(--shadow);
  user-select: none;
}

.nav-button:hover {
  color: var(--text);
  border-color: var(--text-faint);
}

.nav-state:focus-visible + .nav-button {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav-button .bars {
  display: block;
  width: 13px;
  height: 9px;
  border-top: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  position: relative;
}

.nav-button .bars::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 0;
  width: 100%;
  border-top: 1.5px solid currentColor;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 35;
  width: 15.5rem;
  height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--surface);
  border-right: 1px solid var(--rule);
  padding: 4.2rem 1.25rem 2rem;
  transition: transform 0.18s ease;
}

.sidebar .toc-title {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 0.8rem;
}

.sidebar ol {
  list-style: none;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.85rem;
  line-height: 1.35;
  margin: 0;
  padding: 0;
  counter-reset: toc;
}

.sidebar li {
  margin: 0;
  counter-increment: toc;
}

.sidebar a {
  display: flex;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--text-muted);
  padding: 0.42rem 0.5rem;
  border-radius: 4px;
}

.sidebar a::before {
  content: counter(toc);
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  padding-top: 0.08rem;
  min-width: 1ch;
}

.sidebar a:hover {
  background: var(--surface-alt);
  color: var(--text);
}

.sidebar a:target,
.sidebar a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.sidebar-foot {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.75rem;
  color: var(--text-faint);
}

.sidebar-foot a {
  display: inline;
  padding: 0;
  color: var(--accent);
}

.sidebar-foot a::before {
  content: none;
}

/* Wide: the panel sits in the left gutter, open by default. Checking the box
   collapses it. The text column never moves, so collapsing is a preference
   rather than a layout change. */
@media (min-width: 1180px) {
  .nav-state:checked ~ .sidebar {
    transform: translateX(-100%);
  }

  /* Reserve the panel's width so the text column centres in what's left of
     the viewport instead of sliding underneath it. */
  .nav-state:not(:checked) ~ .wrap {
    max-width: calc(47rem + 15.5rem + 32px);
    padding-left: calc(15.5rem + 16px);
  }

  .nav-button {
    left: 1.1rem;
  }

  .nav-state:not(:checked) ~ .nav-button {
    left: 16.75rem;
    background: transparent;
    border-color: transparent;
    box-shadow: none;
  }

  .nav-state:not(:checked) ~ .nav-button .label {
    display: none;
  }
}

/* Narrow: closed by default, opens as an overlay with a scrim. */
@media (max-width: 1179px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: 0 0 40px var(--shadow);
  }

  /* Clear the fixed toggle, which sits over the masthead at these widths. */
  header.masthead {
    padding-top: 4.75rem;
  }

  .nav-state:checked ~ .sidebar {
    transform: translateX(0);
  }

  .nav-state:checked ~ .scrim {
    opacity: 1;
    pointer-events: auto;
  }
}

.scrim {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}

@media (prefers-reduced-motion: reduce) {
  .sidebar,
  .scrim {
    transition: none;
  }
}

/* Anchored headings shouldn't sit flush against the viewport top. */
h2[id] {
  scroll-margin-top: 1.5rem;
}

/* ---- typography -------------------------------------------------------- */

h2 {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.25;
  margin: 3.75rem 0 0.35rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule);
  text-wrap: balance;
}

h2:first-of-type {
  margin-top: 0;
}

h3 {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 2.25rem 0 0.4rem;
}

.kicker {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.82rem;
  color: var(--text-faint);
  margin: 0 0 1.75rem;
}

p {
  margin: 0 0 1.15rem;
}

a {
  color: var(--accent);
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

strong {
  font-weight: 600;
}

ul,
ol {
  margin: 0 0 1.15rem;
  padding-left: 1.3rem;
}

li {
  margin-bottom: 0.45rem;
}

code {
  font-family: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.855em;
  background: var(--mono-bg);
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

/* ---- verbatim output --------------------------------------------------- */

pre {
  font-family: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.76rem;
  line-height: 1.55;
  background: var(--surface-alt);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.1rem 1.2rem;
  overflow-x: auto;
  margin: 0 0 1.15rem;
  tab-size: 2;
}

pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

figure {
  margin: 0 0 1.6rem;
}

figcaption {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.8rem;
  color: var(--text-faint);
  margin-top: 0.6rem;
  line-height: 1.5;
}

/* ---- tables ------------------------------------------------------------ */

.table-scroll {
  overflow-x: auto;
  margin: 0 0 0.75rem;
  -webkit-overflow-scrolling: touch;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.83rem;
  font-variant-numeric: tabular-nums;
}

caption {
  caption-side: top;
  text-align: left;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.8rem;
  color: var(--text-faint);
  padding-bottom: 0.6rem;
}

th,
td {
  padding: 0.5rem 0.7rem;
  text-align: left;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}

thead th {
  font-weight: 600;
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-faint);
  border-bottom: 1px solid var(--rule-strong);
  vertical-align: bottom;
}

tbody tr:last-child td {
  border-bottom: none;
}

td.num,
th.num {
  text-align: right;
}

td.wrap-cell {
  white-space: normal;
  min-width: 13rem;
}

tbody tr.highlight td {
  background: var(--accent-soft);
}

/* ---- tier badges ------------------------------------------------------- */

.tier {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.12em 0.45em;
  border-radius: 3px;
  border: 1px solid currentColor;
}

.tier-hot {
  color: var(--hot);
}

.tier-warm {
  color: var(--warm);
}

.tier-cold {
  color: var(--cold);
}

/* ---- callouts ---------------------------------------------------------- */

.note {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--rule-strong);
  border-radius: 0 6px 6px 0;
  padding: 1rem 1.2rem;
  margin: 0 0 1.4rem;
  font-size: 0.94rem;
}

.note p:last-child {
  margin-bottom: 0;
}

.note .label {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  display: block;
  margin-bottom: 0.4rem;
}

.note-caution {
  border-left-color: var(--accent);
}

/* ---- headline figures -------------------------------------------------- */

.figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  margin: 0 0 1.5rem;
}

.figures div {
  background: var(--surface);
  padding: 1rem 1.1rem;
}

.figures .value {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  display: block;
  line-height: 1.1;
}

.figures .label {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.75rem;
  color: var(--text-faint);
  display: block;
  margin-top: 0.35rem;
  line-height: 1.35;
  white-space: normal;
}

/* ---- diagram ----------------------------------------------------------- */

.diagram {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 0.5rem;
}

.diagram text {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
}

/* ---- footer ------------------------------------------------------------ */

footer {
  border-top: 1px solid var(--rule);
  margin-top: 4rem;
  padding-top: 1.5rem;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 0.82rem;
  color: var(--text-faint);
}

footer a {
  color: var(--accent);
}

/* ---- small screens ----------------------------------------------------- */

@media (max-width: 640px) {
  body {
    font-size: 17px;
  }

  /* Still has to clear the fixed toggle -- tighter than the tablet value,
     but not back down to the no-sidebar 2.25rem. */
  header.masthead {
    padding-top: 4.25rem;
  }

  pre {
    font-size: 0.68rem;
  }

  h2 {
    margin-top: 2.75rem;
  }
}

@media print {
  body {
    background: #fff;
    color: #000;
  }

  pre,
  .note,
  .figures div {
    border-color: #bbb;
  }
}