/* ID Partners brand — orange #FC6401 as accent only, black text on white/grey. */

:root {
  --orange: #fc6401;
  --orange-tint-1: #ffc39d;
  --orange-tint-2: #ffe1ce;

  --bg: #ffffff;
  --bg-alt: #f1f1f1;
  --bg-sunken: #fafafa;
  --text: #000000;
  --text-muted: #55575c;
  --text-faint: #7c7f86;
  --rule: #e2e2e4;
  --rule-strong: #c9cacd;
  --code-bg: #f6f6f7;

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

  --sidebar-w: 16.5rem;
  --toc-w: 14rem;
  --measure: 44rem;
  --topbar-h: 3.25rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101012;
    --bg-alt: #17171a;
    --bg-sunken: #0b0b0d;
    --text: #f4f4f5;
    --text-muted: #a2a4aa;
    --text-faint: #85878d;
    --rule: #2a2a2f;
    --rule-strong: #3d3d44;
    --code-bg: #17171a;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-h) + 1rem);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 100;
  background: var(--orange);
  color: #fff;
  padding: 0.5rem 0.9rem;
  border-radius: 4px;
}

/* ---------- top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 1.25rem;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
}
.brand {
  display: flex;
  align-items: center;
  flex: none;
}
.brand img {
  display: block;
}
/* The dark-background logo is a separate official asset, swapped via <picture>.
   The mark is never recoloured or filtered. */
.topbar-title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-muted);
  padding-left: 1rem;
  border-left: 1px solid var(--rule);
}
.nav-toggle {
  display: none;
  margin-left: auto;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  background: none;
  border: 1px solid var(--rule-strong);
  color: var(--text);
  border-radius: 4px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}

/* ---------- layout ---------- */

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  align-items: start;
  max-width: 90rem;
  margin: 0 auto;
}

.sidebar {
  position: sticky;
  top: var(--topbar-h);
  max-height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 2rem 1.25rem 3rem;
  border-right: 1px solid var(--rule);
}
.nav-group + .nav-group {
  margin-top: 1.6rem;
}
.nav-group h4 {
  margin: 0 0 0.5rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.nav-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-group li + li {
  margin-top: 0.15rem;
}
.nav-group a {
  display: block;
  padding: 0.3rem 0.6rem;
  margin-left: -0.6rem;
  border-radius: 4px;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--text-muted);
}
.nav-group a:hover {
  background: var(--bg-alt);
  color: var(--text);
}
.nav-group a.current {
  color: var(--text);
  font-weight: 650;
  background: var(--orange-tint-2);
  box-shadow: inset 2px 0 0 var(--orange);
}
@media (prefers-color-scheme: dark) {
  .nav-group a.current {
    background: rgba(252, 100, 1, 0.14);
  }
}
.sidebar-note {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--text-faint);
}

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--toc-w);
  gap: 2.5rem;
  padding: 2.75rem 2rem 4rem;
}

.prose {
  max-width: var(--measure);
  min-width: 0;
}

/* ---------- page head ---------- */

.page-head {
  margin-bottom: 2.5rem;
  padding-bottom: 1.75rem;
  border-bottom: 2px solid var(--text);
}
.eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--orange);
}
.page-head h1 {
  margin: 0;
  font-size: clamp(1.9rem, 1.3rem + 2vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 750;
}
.summary {
  margin: 1rem 0 0;
  font-size: 1.12rem;
  line-height: 1.55;
  color: var(--text-muted);
}
.status-line {
  margin: 1.1rem 0 0;
}

.pill {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--rule-strong);
  color: var(--text-muted);
}
.pill-draft {
  background: var(--bg-alt);
}
.pill-blocked {
  background: var(--orange-tint-2);
  border-color: var(--orange);
  color: #7a3100;
}
.pill-works {
  background: #e7f4ea;
  border-color: #71a97f;
  color: #1f5c30;
}
@media (prefers-color-scheme: dark) {
  .pill-blocked {
    background: rgba(252, 100, 1, 0.16);
    color: var(--orange-tint-1);
  }
  .pill-works {
    background: rgba(90, 170, 110, 0.15);
    border-color: #4b7d58;
    color: #9ed7ae;
  }
}

/* ---------- prose ---------- */

.prose h2 {
  margin: 3rem 0 0.9rem;
  padding-top: 0.4rem;
  font-size: 1.5rem;
  line-height: 1.25;
  letter-spacing: -0.015em;
  font-weight: 720;
}
.prose h3 {
  margin: 2.2rem 0 0.6rem;
  font-size: 1.13rem;
  font-weight: 700;
}
.prose h4 {
  margin: 1.6rem 0 0.4rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
}
.anchor {
  float: left;
  margin-left: -1.15rem;
  width: 1.15rem;
  text-decoration: none;
  color: var(--rule-strong);
  opacity: 0;
  font-weight: 400;
}
h2:hover .anchor,
h3:hover .anchor,
.anchor:focus {
  opacity: 1;
}
@media (max-width: 900px) {
  .anchor {
    display: none;
  }
}

.prose p {
  margin: 0 0 1.1rem;
}
.prose ul,
.prose ol {
  margin: 0 0 1.2rem;
  padding-left: 1.35rem;
}
.prose li {
  margin-bottom: 0.45rem;
}
.prose li > ul,
.prose li > ol {
  margin-top: 0.45rem;
  margin-bottom: 0.2rem;
}
.prose strong {
  font-weight: 680;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.1rem 0 0.1rem 1.15rem;
  border-left: 3px solid var(--orange);
  color: var(--text-muted);
  font-style: normal;
}
.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose hr {
  margin: 3rem 0;
  border: 0;
  border-top: 1px solid var(--rule);
}

code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.08em 0.34em;
  word-break: break-word;
}
pre.code {
  margin: 1.5rem 0;
  padding: 1rem 1.1rem;
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--rule-strong);
  border-radius: 5px;
  overflow-x: auto;
  font-size: 0.83rem;
  line-height: 1.6;
}
pre.code code {
  background: none;
  border: 0;
  padding: 0;
  font-size: inherit;
}

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

.prose table {
  width: 100%;
  margin: 1.6rem 0;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.prose thead th {
  text-align: left;
  font-weight: 700;
  font-size: 0.74rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0.5rem 0.7rem;
  border-bottom: 2px solid var(--text);
}
.prose td {
  padding: 0.6rem 0.7rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.prose tbody tr:hover {
  background: var(--bg-alt);
}
.table-wrap,
.prose table {
  display: table;
}
@media (max-width: 700px) {
  .prose table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

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

.diagram {
  margin: 1.9rem 0;
  padding: 1.25rem;
  background: var(--bg-alt);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow-x: auto;
  text-align: center;
}
.diagram pre.mermaid {
  margin: 0;
  background: none;
  border: 0;
}
figcaption {
  margin-top: 0.8rem;
  font-size: 0.8rem;
  color: var(--text-faint);
  text-align: left;
}

/* ---------- custom blocks ---------- */

.callout {
  margin: 1.8rem 0;
  padding: 1.05rem 1.2rem;
  border: 1px solid var(--rule-strong);
  border-left: 4px solid var(--orange);
  border-radius: 5px;
  background: var(--bg-alt);
  font-size: 0.94rem;
}
.callout > :first-child {
  margin-top: 0;
}
.callout > :last-child {
  margin-bottom: 0;
}
.callout .label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 0.4rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
  margin: 1.8rem 0;
}
.card {
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--rule);
  border-top: 3px solid var(--orange);
  border-radius: 5px;
  background: var(--bg);
}
.card h4 {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
  color: var(--text);
}
.card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* paired phone frames */
.frames {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 1.9rem 0;
}
.frame img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rule-strong);
  border-radius: 14px;
  background: #000;
}
.frame figcaption {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--text-muted);
}
.frame figcaption strong {
  color: var(--text);
}
@media (max-width: 600px) {
  .frames {
    grid-template-columns: 1fr;
  }
}

/* video */
.video {
  margin: 1.9rem 0;
}
.video video,
.video img.placeholder {
  width: 100%;
  display: block;
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  background: #000;
}
.video-pending {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 15rem;
  border: 1px dashed var(--rule-strong);
  border-radius: 6px;
  background: var(--bg-alt);
  color: var(--text-faint);
  font-size: 0.88rem;
  text-align: center;
  padding: 2rem;
}

/* ---------- pager ---------- */

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
.pager a {
  display: block;
  padding: 0.85rem 1rem;
  border: 1px solid var(--rule);
  border-radius: 5px;
  text-decoration: none;
  font-weight: 650;
  font-size: 0.95rem;
}
.pager a:hover {
  border-color: var(--orange);
}
.pager a span {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 0.2rem;
}
.pager .next {
  text-align: right;
}

/* ---------- toc ---------- */

.toc {
  position: sticky;
  top: calc(var(--topbar-h) + 2.75rem);
  align-self: start;
  max-height: calc(100vh - var(--topbar-h) - 4rem);
  overflow-y: auto;
  font-size: 0.83rem;
  border-left: 1px solid var(--rule);
  padding-left: 1.1rem;
}
.toc h4 {
  margin: 0 0 0.6rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.toc li {
  margin-bottom: 0.3rem;
  line-height: 1.35;
}
.toc li.d3 {
  padding-left: 0.8rem;
  font-size: 0.78rem;
}
.toc a {
  text-decoration: none;
  color: var(--text-muted);
}
.toc a:hover,
.toc a.active {
  color: var(--orange);
}

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

.sitefoot {
  border-top: 1px solid var(--rule);
  padding: 1.5rem 2rem;
  text-align: center;
}
.sitefoot p {
  margin: 0;
  font-size: 0.76rem;
  color: var(--text-faint);
}

/* ---------- responsive ---------- */

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

@media (max-width: 860px) {
  .nav-toggle {
    display: block;
  }
  .topbar-title {
    display: none;
  }
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .sidebar {
    display: none;
    position: static;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
    padding: 1.25rem;
  }
  .sidebar.open {
    display: block;
  }
  main {
    padding: 1.75rem 1.15rem 3rem;
  }
  .pager {
    grid-template-columns: 1fr;
  }
  .pager .next {
    text-align: left;
  }
}

@media print {
  .topbar,
  .sidebar,
  .toc,
  .pager {
    display: none;
  }
  main {
    grid-template-columns: 1fr;
    padding: 0;
  }
}