/* ==========================================================================
   DUST-20 documentation stylesheet.

   Design intent: a technical datasheet. A fine grid substrate, hairline
   rules, exact monospace numerics, no shadows, no gradients, no rounded
   decoration. One signal colour, reserved for conformance and focus.

   Layer order:
     1  tokens and themes
     2  reset and base
     3  layout shell
     4  page furniture (masthead, sidebar, contents, colophon)
     5  datasheet primitives (tables, rules, tags, notes, figures)
     6  interactive surfaces (forms, decoder, simulator, search)
     7  responsive
   ========================================================================== */

/* -- 1. tokens ----------------------------------------------------------- */

:root {
  color-scheme: light dark;

  --paper: #f4f4f1;
  --panel: #ffffff;
  --panel-2: #eaeae6;
  --ink: #14161a;
  --ink-2: #3d434c;
  --ink-3: #565e68;
  --line: #c4c9cf;
  --line-2: #e0e3e7;
  --grid: #e3e5e8;
  --accent: #0a6a78;
  --accent-soft: #dceef1;
  --fail: #a02020;
  --fail-soft: #f7e3e3;
  --warn: #7d5300;
  --warn-soft: #f6ecd8;
  --selection: #cfe9ed;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --grid-step: 24px;
  --shell: 1440px;
  --measure: 74ch;
  --hair: 1px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0c0e11;
    --panel: #131619;
    --panel-2: #1a1e23;
    --ink: #e7eaed;
    --ink-2: #b7bec6;
    --ink-3: #8b939d;
    --line: #2c323a;
    --line-2: #1e2329;
    --grid: #16191d;
    --accent: #3fd0e0;
    --accent-soft: #0e2a2f;
    --fail: #ff8078;
    --fail-soft: #2c1614;
    --warn: #e0a33a;
    --warn-soft: #2a2113;
    --selection: #12363c;
  }
}

html[data-theme="light"] {
  --paper: #f4f4f1;
  --panel: #ffffff;
  --panel-2: #eaeae6;
  --ink: #14161a;
  --ink-2: #3d434c;
  --ink-3: #565e68;
  --line: #c4c9cf;
  --line-2: #e0e3e7;
  --grid: #e3e5e8;
  --accent: #0a6a78;
  --accent-soft: #dceef1;
  --fail: #a02020;
  --fail-soft: #f7e3e3;
  --warn: #7d5300;
  --warn-soft: #f6ecd8;
  --selection: #cfe9ed;
  color-scheme: light;
}

html[data-theme="dark"] {
  --paper: #0c0e11;
  --panel: #131619;
  --panel-2: #1a1e23;
  --ink: #e7eaed;
  --ink-2: #b7bec6;
  --ink-3: #8b939d;
  --line: #2c323a;
  --line-2: #1e2329;
  --grid: #16191d;
  --accent: #3fd0e0;
  --accent-soft: #0e2a2f;
  --fail: #ff8078;
  --fail-soft: #2c1614;
  --warn: #e0a33a;
  --warn-soft: #2a2113;
  --selection: #12363c;
  color-scheme: dark;
}

/* -- 2. reset and base --------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, var(--grid) var(--hair), transparent var(--hair)),
    linear-gradient(to bottom, var(--grid) var(--hair), transparent var(--hair));
  background-size: var(--grid-step) var(--grid-step);
  background-position: -1px -1px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
}

::selection {
  background: var(--selection);
  color: var(--ink);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.011em;
  color: var(--ink);
}

h1 {
  font-size: clamp(1.9rem, 1.3rem + 2vw, 2.7rem);
}
h2 {
  font-size: clamp(1.3rem, 1.1rem + 0.9vw, 1.65rem);
}
h3 {
  font-size: 1.06rem;
}
h4 {
  font-size: 0.95rem;
}

p {
  margin: 0 0 0.85rem;
}

p,
li {
  max-width: var(--measure);
}

a {
  color: var(--ink);
  text-decoration-color: var(--line);
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

code,
kbd,
samp {
  font-family: var(--mono);
  font-size: 0.88em;
}

:not(pre) > code {
  background: var(--panel-2);
  border: var(--hair) solid var(--line-2);
  padding: 0.05em 0.32em;
  white-space: nowrap;
}

kbd {
  background: var(--panel);
  border: var(--hair) solid var(--line);
  border-bottom-width: 2px;
  padding: 0.05em 0.35em;
  font-size: 0.75rem;
  color: var(--ink-2);
}

pre {
  margin: 0 0 1rem;
  padding: 0.85rem 1rem;
  background: var(--panel);
  border: var(--hair) solid var(--line);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.83rem;
  line-height: 1.55;
  tab-size: 2;
}

hr {
  border: 0;
  border-top: var(--hair) solid var(--line);
  margin: 2rem 0;
}

ul,
ol {
  margin: 0 0 1rem;
  padding-left: 1.15rem;
}

li {
  margin-bottom: 0.3rem;
}

img,
svg {
  max-width: 100%;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: var(--paper);
  padding: 0.6rem 1rem;
  font: 600 0.85rem/1 var(--mono);
}

.skip-link:focus {
  left: 0;
}

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

/* -- 3. layout shell ----------------------------------------------------- */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 clamp(0.85rem, 2vw, 2rem);
}

.layout {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr) 214px;
  gap: 0;
  max-width: var(--shell);
  margin: 0 auto;
  align-items: start;
}

.main {
  min-width: 0;
  padding: 1.6rem clamp(1rem, 2.4vw, 2.6rem) 4rem;
  border-left: var(--hair) solid var(--line);
  border-right: var(--hair) solid var(--line);
  background: color-mix(in srgb, var(--paper) 82%, var(--panel));
}

/* -- 4. masthead --------------------------------------------------------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--paper);
  border-bottom: var(--hair) solid var(--line);
}

.masthead-inner {
  display: flex;
  align-items: stretch;
  gap: 0;
  max-width: var(--shell);
  margin: 0 auto;
  min-height: 52px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0 1rem;
  text-decoration: none;
  border-right: var(--hair) solid var(--line);
  flex: 0 0 auto;
}

.brand-mark {
  display: block;
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
}

.brand-text {
  font: 600 0.92rem/1 var(--mono);
  letter-spacing: 0.06em;
  color: var(--ink);
}

.brand-rev {
  font: 400 0.66rem/1 var(--mono);
  color: var(--ink-3);
  letter-spacing: 0.05em;
  border-left: var(--hair) solid var(--line);
  padding-left: 0.55rem;
}

.masthead-nav {
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  scrollbar-width: none;
  flex: 1 1 auto;
}

.masthead-nav::-webkit-scrollbar {
  display: none;
}

.masthead-nav a {
  display: flex;
  align-items: center;
  padding: 0 0.78rem;
  font: 500 0.775rem/1 var(--mono);
  letter-spacing: 0.035em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}

.masthead-nav a:hover {
  color: var(--ink);
  background: var(--panel-2);
}

.masthead-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.masthead-tools {
  display: flex;
  align-items: stretch;
  border-left: var(--hair) solid var(--line);
  flex: 0 0 auto;
}

.tool-button {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0 0.8rem;
  background: none;
  border: 0;
  border-left: var(--hair) solid var(--line-2);
  color: var(--ink-3);
  font: 500 0.75rem/1 var(--mono);
  letter-spacing: 0.03em;
  cursor: pointer;
}

.tool-button:first-child {
  border-left: 0;
}

.tool-button:hover {
  background: var(--panel-2);
  color: var(--ink);
}

.tool-button svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
}

/* -- 4b. sidebar and contents -------------------------------------------- */

.sidebar,
.contents {
  position: sticky;
  top: 52px;
  max-height: calc(100vh - 52px);
  overflow-y: auto;
  padding: 1.6rem 0.9rem 3rem;
  font-size: 0.83rem;
}

.sidebar h2,
.contents h2 {
  font: 600 0.68rem/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 0.7rem;
  padding-bottom: 0.45rem;
  border-bottom: var(--hair) solid var(--line);
}

.sidebar-group {
  margin-bottom: 1.15rem;
}

.sidebar-group > span {
  display: block;
  font: 500 0.66rem/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.35rem;
}

.sidebar ul,
.contents ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar li,
.contents li {
  margin: 0;
  max-width: none;
}

.sidebar a,
.contents a {
  display: block;
  padding: 0.22rem 0.5rem;
  color: var(--ink-2);
  text-decoration: none;
  border-left: 2px solid var(--line-2);
  line-height: 1.4;
}

.sidebar a:hover,
.contents a:hover {
  color: var(--ink);
  border-left-color: var(--ink-3);
  background: var(--panel-2);
}

.sidebar a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
  border-left-color: var(--accent);
  background: var(--panel-2);
}

.contents a {
  font-family: var(--mono);
  font-size: 0.74rem;
}

.sidebar-meta {
  margin-top: 1.4rem;
  padding-top: 0.9rem;
  border-top: var(--hair) solid var(--line);
  font: 400 0.7rem/1.5 var(--mono);
  color: var(--ink-3);
}

.sidebar-meta div {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.12rem 0;
}

.sidebar-meta b {
  font-weight: 500;
  color: var(--ink-2);
}

/* -- 4c. page head and datasheet ----------------------------------------- */

.pagehead {
  border-bottom: var(--hair) solid var(--line);
  padding-bottom: 1.3rem;
  margin-bottom: 1.8rem;
}

.pagehead .eyebrow {
  font: 500 0.68rem/1 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.7rem;
}

.pagehead p.tagline {
  font-size: 1.02rem;
  color: var(--ink-2);
  margin: 0.6rem 0 0;
  max-width: 62ch;
}

.dsheet {
  margin: 1.4rem 0 0;
  border: var(--hair) solid var(--line);
  background: var(--panel);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(178px, 1fr));
}

.dsheet div {
  padding: 0.55rem 0.75rem;
  border-right: var(--hair) solid var(--line-2);
  border-bottom: var(--hair) solid var(--line-2);
}

.dsheet dt {
  font: 500 0.63rem/1.3 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 0.22rem;
}

.dsheet dd {
  margin: 0;
  font: 600 0.86rem/1.3 var(--mono);
  color: var(--ink);
  word-break: break-word;
}

.dsheet dd small {
  display: block;
  font: 400 0.68rem/1.4 var(--sans);
  color: var(--ink-3);
  margin-top: 0.15rem;
}

/* -- 5. sections and datasheet primitives -------------------------------- */

.section {
  margin: 0 0 2.8rem;
  scroll-margin-top: 76px;
}

.section > h2 {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  border-bottom: var(--hair) solid var(--line);
}

.section > h2 .num {
  font: 500 0.72rem/1 var(--mono);
  letter-spacing: 0.08em;
  color: var(--accent);
  flex: 0 0 auto;
}

.section > h3 {
  margin: 1.8rem 0 0.7rem;
}

.lede {
  font-size: 1rem;
  color: var(--ink-2);
  max-width: 68ch;
}

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

.scroll {
  overflow-x: auto;
  border: var(--hair) solid var(--line);
  background: var(--panel);
  margin: 0 0 1.2rem;
  max-width: 100%;
}

table.tbl {
  border-collapse: collapse;
  width: 100%;
  min-width: 480px;
  font-size: 0.83rem;
}

table.tbl caption {
  text-align: left;
  padding: 0.6rem 0.75rem;
  font: 500 0.68rem/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-bottom: var(--hair) solid var(--line);
  background: var(--panel-2);
}

table.tbl th,
table.tbl td {
  padding: 0.48rem 0.75rem;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--hair) solid var(--line-2);
}

table.tbl thead th {
  position: sticky;
  top: 0;
  background: var(--panel-2);
  font: 600 0.67rem/1.3 var(--mono);
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-bottom: var(--hair) solid var(--line);
  white-space: nowrap;
}

table.tbl tbody tr:last-child td {
  border-bottom: 0;
}

table.tbl tbody tr:hover {
  background: color-mix(in srgb, var(--panel-2) 60%, transparent);
}

table.tbl td.num,
table.tbl td.mono,
table.tbl th.mono {
  font-family: var(--mono);
  font-size: 0.78rem;
  white-space: nowrap;
}

table.tbl td.num {
  text-align: right;
}

table.tbl td p {
  max-width: 56ch;
  margin: 0;
}

table.tbl td small {
  display: block;
  color: var(--ink-3);
  font-size: 0.75rem;
  margin-top: 0.2rem;
  max-width: 56ch;
}

/* numbered rules ---------------------------------------------------------- */

.rules {
  border: var(--hair) solid var(--line);
  background: var(--panel);
}

.rule {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  border-bottom: var(--hair) solid var(--line-2);
  scroll-margin-top: 80px;
}

.rule:last-child {
  border-bottom: 0;
}

.rule:target {
  background: var(--accent-soft);
}

.rule-id {
  padding: 0.7rem 0.5rem 0.7rem 0.75rem;
  font: 600 0.73rem/1.5 var(--mono);
  letter-spacing: 0.02em;
  color: var(--accent);
  border-right: var(--hair) solid var(--line-2);
  background: color-mix(in srgb, var(--panel-2) 55%, transparent);
}

.rule-id a {
  color: inherit;
  text-decoration: none;
}

.rule-id a:hover {
  text-decoration: underline;
}

.rule-body {
  padding: 0.7rem 0.85rem;
}

.rule-body h3 {
  font-size: 0.92rem;
  margin: 0 0 0.3rem;
}

.rule-body p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-2);
  max-width: 76ch;
}

.rule-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.5rem;
  align-items: center;
}

/* tags -------------------------------------------------------------------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.06rem 0.4rem;
  font: 600 0.63rem/1.6 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: var(--hair) solid var(--line);
  color: var(--ink-3);
  background: var(--panel-2);
  white-space: nowrap;
}

.tag--verified {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.tag--universe {
  color: var(--ink-2);
  border-color: var(--line);
}

.tag--legacy {
  color: var(--ink-3);
  border-style: dashed;
}

.tag--implementation {
  color: var(--warn);
  border-color: var(--warn);
  background: var(--warn-soft);
}

.tag--unresolved {
  color: var(--fail);
  border-color: var(--fail);
  background: var(--fail-soft);
}

.tag--ref {
  color: var(--ink-2);
  text-decoration: none;
  background: none;
}

.tag--ref:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* pass / fail verdicts ---------------------------------------------------- */

.verdict {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.08rem 0.45rem;
  font: 700 0.68rem/1.6 var(--mono);
  letter-spacing: 0.1em;
  border: var(--hair) solid currentColor;
  white-space: nowrap;
}

.verdict::before {
  content: "";
  width: 7px;
  height: 7px;
  background: currentColor;
  flex: 0 0 auto;
}

.verdict--pass {
  color: var(--accent);
  background: var(--accent-soft);
}

.verdict--fail {
  color: var(--fail);
  background: var(--fail-soft);
}

.verdict--fail::before {
  transform: rotate(45deg);
}

.verdict--idle {
  color: var(--ink-3);
  background: var(--panel-2);
}

.verdict--idle::before {
  background: none;
  border: var(--hair) solid currentColor;
}

/* notes ------------------------------------------------------------------- */

.note {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  border: var(--hair) solid var(--line);
  border-left-width: 3px;
  background: var(--panel);
  margin: 0 0 1.2rem;
}

.note-mark {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 0.72rem;
  font: 700 0.8rem/1 var(--mono);
  color: var(--ink-3);
  border-right: var(--hair) solid var(--line-2);
}

.note-body {
  padding: 0.7rem 0.85rem;
}

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

.note-title {
  font: 600 0.85rem/1.4 var(--sans);
  margin: 0 0 0.25rem;
}

.note-body p {
  font-size: 0.88rem;
  color: var(--ink-2);
}

.note--critical {
  border-left-color: var(--fail);
}
.note--critical .note-mark {
  color: var(--fail);
}
.note--warn {
  border-left-color: var(--warn);
}
.note--warn .note-mark {
  color: var(--warn);
}
.note--info {
  border-left-color: var(--accent);
}
.note--info .note-mark {
  color: var(--accent);
}

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

.figure {
  margin: 0 0 1.4rem;
  border: var(--hair) solid var(--line);
  background: var(--panel);
}

.figure .figure-body {
  padding: 1rem;
  overflow-x: auto;
}

.figure svg {
  display: block;
  width: 100%;
  height: auto;
  min-width: 340px;
  --dg-line: var(--line);
  --dg-ink: var(--ink);
  --dg-ink-2: var(--ink-2);
  --dg-ink-3: var(--ink-3);
  --dg-fill: var(--panel-2);
  --dg-accent: var(--accent);
  --dg-fail: var(--fail);
}

.figure figcaption {
  padding: 0.5rem 0.75rem;
  border-top: var(--hair) solid var(--line-2);
  font: 400 0.75rem/1.5 var(--sans);
  color: var(--ink-3);
  background: var(--panel-2);
}

.figure figcaption b {
  font: 600 0.68rem/1.5 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-right: 0.4rem;
}

/* card grids -------------------------------------------------------------- */

.cards {
  display: grid;
  gap: 0;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  border: var(--hair) solid var(--line);
  background: var(--panel);
  margin: 0 0 1.3rem;
  list-style: none;
  padding: 0;
}

.cards > * {
  padding: 0.85rem 0.9rem;
  border-right: var(--hair) solid var(--line-2);
  border-bottom: var(--hair) solid var(--line-2);
  margin: 0;
}

.cards h3 {
  font-size: 0.94rem;
  margin: 0.3rem 0 0.35rem;
}

.cards p {
  font-size: 0.85rem;
  color: var(--ink-2);
  margin: 0;
  max-width: none;
}

.card-index {
  font: 500 0.63rem/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

a.card {
  text-decoration: none;
  display: block;
}

a.card:hover {
  background: var(--panel-2);
}

a.card:hover h3 {
  color: var(--accent);
}

/* key/value list ---------------------------------------------------------- */

.kv {
  border: var(--hair) solid var(--line);
  background: var(--panel);
  margin: 0 0 1.2rem;
}

.kv > div {
  display: grid;
  grid-template-columns: minmax(150px, 210px) minmax(0, 1fr);
  border-bottom: var(--hair) solid var(--line-2);
}

.kv > div:last-child {
  border-bottom: 0;
}

.kv dt {
  padding: 0.55rem 0.75rem;
  font: 500 0.7rem/1.5 var(--mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-right: var(--hair) solid var(--line-2);
  background: color-mix(in srgb, var(--panel-2) 55%, transparent);
}

.kv dd {
  margin: 0;
  padding: 0.55rem 0.75rem;
  font-size: 0.87rem;
  color: var(--ink);
}

.kv dd p {
  margin: 0;
  font-size: 0.87rem;
}

/* -- 6. interactive surfaces --------------------------------------------- */

.panel {
  border: var(--hair) solid var(--line);
  background: var(--panel);
  margin: 0 0 1.3rem;
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.8rem;
  border-bottom: var(--hair) solid var(--line);
  background: var(--panel-2);
}

.panel-head h3 {
  font: 600 0.72rem/1.4 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0;
}

.panel-body {
  padding: 0.85rem;
}

.panel-body > :last-child {
  margin-bottom: 0;
}

.field-row {
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin-bottom: 0.85rem;
}

label {
  display: block;
  font: 500 0.66rem/1.5 var(--mono);
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.22rem;
}

input[type="text"],
input[type="search"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.42rem 0.55rem;
  background: var(--paper);
  border: var(--hair) solid var(--line);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.83rem;
  line-height: 1.5;
}

textarea {
  min-height: 8.5rem;
  resize: vertical;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  border-color: var(--accent);
}

.hint {
  display: block;
  font: 400 0.72rem/1.5 var(--sans);
  color: var(--ink-3);
  margin-top: 0.2rem;
  text-transform: none;
  letter-spacing: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border: var(--hair) solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  font: 600 0.72rem/1.5 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  cursor: pointer;
  text-decoration: none;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--paper);
}

.btn--primary:hover {
  color: var(--paper);
  filter: brightness(1.08);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.readout {
  border: var(--hair) solid var(--line);
  background: var(--paper);
  font-family: var(--mono);
  font-size: 0.8rem;
}

.readout-row {
  display: grid;
  grid-template-columns: minmax(120px, 190px) minmax(0, 1fr);
  border-bottom: var(--hair) solid var(--line-2);
}

.readout-row:last-child {
  border-bottom: 0;
}

.readout-row > span:first-child {
  padding: 0.35rem 0.6rem;
  color: var(--ink-3);
  border-right: var(--hair) solid var(--line-2);
  letter-spacing: 0.04em;
}

.readout-row > span:last-child {
  padding: 0.35rem 0.6rem;
  color: var(--ink);
  word-break: break-word;
}

.readout-row small {
  display: block;
  font-family: var(--sans);
  color: var(--ink-3);
  font-size: 0.72rem;
  margin-top: 0.1rem;
}

.issue {
  border: var(--hair) solid var(--fail);
  border-left-width: 3px;
  background: var(--fail-soft);
  padding: 0.6rem 0.75rem;
  margin-bottom: 0.7rem;
}

.issue-code {
  font: 700 0.68rem/1.6 var(--mono);
  letter-spacing: 0.08em;
  color: var(--fail);
  text-transform: uppercase;
}

.issue p {
  margin: 0.2rem 0 0;
  font-size: 0.85rem;
  color: var(--ink);
}

.warnbox {
  border: var(--hair) solid var(--warn);
  border-left-width: 3px;
  background: var(--warn-soft);
  padding: 0.55rem 0.75rem;
  margin-bottom: 0.7rem;
  font-size: 0.84rem;
}

/* sat bar ----------------------------------------------------------------- */

.satbar {
  display: flex;
  width: 100%;
  min-width: 300px;
  height: 34px;
  border: var(--hair) solid var(--line);
  margin-bottom: 0.35rem;
  overflow: hidden;
}

.satbar span {
  display: flex;
  align-items: center;
  justify-content: center;
  font: 500 0.63rem/1 var(--mono);
  letter-spacing: 0.04em;
  color: var(--ink-2);
  border-right: var(--hair) solid var(--line);
  overflow: hidden;
  white-space: nowrap;
  min-width: 0;
}

.satbar span:last-child {
  border-right: 0;
}

.satbar .seg--colored {
  background: var(--accent-soft);
  color: var(--accent);
}
.satbar .seg--cardinal {
  background: var(--panel-2);
}
.satbar .seg--burn {
  background: var(--fail-soft);
  color: var(--fail);
}
.satbar .seg--unsupported {
  background: repeating-linear-gradient(
    45deg,
    var(--panel-2),
    var(--panel-2) 4px,
    var(--paper) 4px,
    var(--paper) 8px
  );
}

.satbar-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  font: 400 0.7rem/1.5 var(--mono);
  color: var(--ink-3);
  margin-bottom: 1rem;
}

.satbar-legend span::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 0.35rem;
  border: var(--hair) solid var(--line);
  vertical-align: baseline;
}

.satbar-legend .k-colored::before {
  background: var(--accent-soft);
}
.satbar-legend .k-cardinal::before {
  background: var(--panel-2);
}
.satbar-legend .k-burn::before {
  background: var(--fail-soft);
}

/* vector list ------------------------------------------------------------- */

.vector {
  border-bottom: var(--hair) solid var(--line-2);
  scroll-margin-top: 80px;
}

.vector:last-child {
  border-bottom: 0;
}

.vector summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.75rem;
  cursor: pointer;
  list-style: none;
}

.vector summary::-webkit-details-marker {
  display: none;
}

.vector summary:hover {
  background: var(--panel-2);
}

.vector summary .vname {
  font: 500 0.85rem/1.4 var(--sans);
  flex: 1 1 220px;
}

.vector summary .vid {
  font: 400 0.7rem/1.4 var(--mono);
  color: var(--ink-3);
}

.vector-detail {
  padding: 0 0.75rem 0.85rem;
  border-top: var(--hair) solid var(--line-2);
}

.vector-detail p {
  font-size: 0.85rem;
  color: var(--ink-2);
  margin: 0.6rem 0;
}

/* filter bar -------------------------------------------------------------- */

.filterbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 0.55rem 0.8rem;
  border: var(--hair) solid var(--line);
  border-bottom: 0;
  background: var(--panel-2);
}

.filterbar input[type="search"] {
  flex: 1 1 190px;
  min-width: 0;
}

.filterbar .count {
  font: 500 0.7rem/1 var(--mono);
  color: var(--ink-3);
  letter-spacing: 0.05em;
}

/* search dialog ----------------------------------------------------------- */

dialog.search {
  width: min(640px, 94vw);
  max-height: 78vh;
  padding: 0;
  border: var(--hair) solid var(--line);
  background: var(--panel);
  color: var(--ink);
  margin-top: 8vh;
}

dialog.search::backdrop {
  background: rgb(0 0 0 / 0.45);
}

.search-form {
  display: flex;
  gap: 0.5rem;
  padding: 0.65rem;
  border-bottom: var(--hair) solid var(--line);
  background: var(--panel-2);
}

.search-results {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-y: auto;
  max-height: 60vh;
}

.search-results li {
  margin: 0;
  max-width: none;
  border-bottom: var(--hair) solid var(--line-2);
}

.search-results a {
  display: block;
  padding: 0.55rem 0.8rem;
  text-decoration: none;
}

.search-results a:hover,
.search-results a:focus-visible {
  background: var(--panel-2);
}

.search-results .sr-where {
  font: 500 0.63rem/1.5 var(--mono);
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent);
}

.search-results .sr-title {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
}

.search-results .sr-text {
  display: block;
  font-size: 0.8rem;
  color: var(--ink-3);
  margin-top: 0.1rem;
}

.search-empty {
  padding: 1.2rem 0.9rem;
  font-size: 0.86rem;
  color: var(--ink-3);
}

.search-empty ul {
  margin: 0.5rem 0 0;
}

/* -- 4d. page navigation and colophon ------------------------------------ */

.pagenav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  border: var(--hair) solid var(--line);
  margin-top: 2.4rem;
  background: var(--panel);
}

.pagenav a {
  padding: 0.7rem 0.85rem;
  text-decoration: none;
  border-right: var(--hair) solid var(--line-2);
}

.pagenav a:last-child {
  border-right: 0;
  text-align: right;
}

.pagenav em {
  display: block;
  font: 500 0.63rem/1.6 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-style: normal;
  color: var(--ink-3);
}

.pagenav b {
  font-size: 0.92rem;
}

.pagenav a:hover b {
  color: var(--accent);
}

.colophon {
  border-top: var(--hair) solid var(--line);
  background: var(--paper);
  margin-top: 0;
}

.colophon-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 1.4rem clamp(0.85rem, 2vw, 2rem) 2.4rem;
}

.colophon-grid {
  display: grid;
  gap: 0;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  border: var(--hair) solid var(--line);
  background: var(--panel);
  font-size: 0.8rem;
}

.colophon-grid > div {
  padding: 0.65rem 0.8rem;
  border-right: var(--hair) solid var(--line-2);
  border-bottom: var(--hair) solid var(--line-2);
}

.colophon-grid dt,
.colophon-grid h2 {
  font: 500 0.63rem/1.4 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 0.3rem;
}

.colophon-grid dd {
  margin: 0 0 0.4rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  word-break: break-word;
}

.colophon-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.colophon-grid li {
  margin: 0 0 0.2rem;
  max-width: none;
}

.colophon-grid a {
  font-size: 0.8rem;
}

.colophon-note {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  color: var(--ink-3);
  max-width: 92ch;
}

/* -- 7. responsive ------------------------------------------------------- */

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: 210px minmax(0, 1fr);
  }
  .contents {
    display: none;
  }
  .main {
    border-right: 0;
  }
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .sidebar {
    position: static;
    max-height: none;
    border-bottom: var(--hair) solid var(--line);
    padding: 1rem 0.9rem 1.2rem;
  }
  .sidebar[hidden] {
    display: none;
  }
  .main {
    border-left: 0;
    padding-top: 1.2rem;
  }
  .rule {
    grid-template-columns: minmax(0, 1fr);
  }
  .rule-id {
    border-right: 0;
    border-bottom: var(--hair) solid var(--line-2);
    padding-bottom: 0.35rem;
  }
  .kv > div {
    grid-template-columns: minmax(0, 1fr);
  }
  .kv dt {
    border-right: 0;
    border-bottom: var(--hair) solid var(--line-2);
  }
  .readout-row {
    grid-template-columns: minmax(0, 1fr);
  }
  .readout-row > span:first-child {
    border-right: 0;
    border-bottom: var(--hair) solid var(--line-2);
  }
}

@media (max-width: 620px) {
  :root {
    --grid-step: 20px;
  }
  body {
    font-size: 15px;
  }
  .brand-rev {
    display: none;
  }
  .masthead-nav {
    display: none;
  }
  .masthead-nav.is-open {
    display: flex;
    position: absolute;
    top: 52px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--panel);
    border-bottom: var(--hair) solid var(--line);
    max-height: 70vh;
    overflow-y: auto;
  }
  .masthead-nav.is-open a {
    padding: 0.65rem 1rem;
    border-bottom: var(--hair) solid var(--line-2);
    border-left: 2px solid transparent;
  }
  .masthead-nav.is-open a[aria-current="page"] {
    border-left-color: var(--accent);
  }
  .tool-button .label {
    display: none;
  }
  .pagenav a:last-child {
    text-align: left;
  }
}

@media (min-width: 621px) {
  .menu-toggle {
    display: none;
  }
}

@media print {
  .masthead,
  .sidebar,
  .contents,
  .pagenav,
  dialog.search {
    display: none;
  }
  body {
    background: #fff;
    color: #000;
  }
  .main {
    border: 0;
  }
}