/* ============================================================================
   IREX Release Notes — layout + feature blocks.
   Fonts, colors, type scale, lists, tables: docs-site.css
   ========================================================================== */

:root {
  /* Release labels — brand palette only */
  --badge-new:            var(--irex-teal);
  --badge-new-fg:         var(--irex-white);
  --badge-improve:        var(--teal-wash);
  --badge-improve-fg:     var(--irex-teal);

  --maxw: var(--docs-measure, 50rem);
  --navw: 260px;
  --pagetocw: 180px;
  --topbar-h: 4.25rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
  /* Keep in-page anchors clear of the sticky topbar */
  scroll-padding-top: calc(var(--topbar-h) + var(--space-4));
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-relaxed);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }

/* ---- App layout: full-width topbar + left version nav + content -------- */
.rn-app {
  display: grid;
  grid-template-columns: var(--navw) minmax(0, 1fr);
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "top top"
    "nav main";
  min-height: 100vh;
  background: var(--bg);
}

.rn {
  grid-area: main;
  max-width: none;
  width: 100%;
  margin: 0;
  padding: var(--space-6) var(--space-5) var(--space-9);
  min-width: 0;
  justify-self: stretch;
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--pagetocw);
  column-gap: var(--space-6); /* keep in sync with CRITICAL_CSS column-gap:2rem */
  align-items: start;
}
.rn-article {
  grid-column: 1;
  min-width: 0;
  max-width: var(--maxw);
  width: 100%;
  justify-self: center;
}
.rn-pagetoc {
  grid-column: 2;
  position: sticky;
  top: calc(var(--topbar-h) + var(--space-6));
  align-self: start;
  max-height: calc(100vh - var(--topbar-h) - var(--space-8));
  overflow: auto;
  padding: 0 0 var(--space-4);
  justify-self: end;
  width: var(--pagetocw);
}
.rn-pagetoc-label {
  margin: 0 0 var(--space-3);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.6875rem;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--fg-subtle);
}
.rn-pagetoc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--border);
}
.rn-pagetoc-list a {
  display: block;
  padding: 0.35rem 0 0.35rem 0.75rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.35;
  color: var(--fg-muted);
  text-decoration: none;
  border-bottom: 0;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.rn-pagetoc-list a:hover {
  color: var(--fg);
  border-bottom: 0;
  border-left-color: var(--border);
}
.rn-pagetoc-list a[aria-current="location"] {
  color: var(--fg);
  font-weight: 600;
  border-left-color: var(--accent);
}
.rn-pagetoc-list .rn-pagetoc-item--h3 a {
  padding-left: 1.25rem;
}
@media (max-width: 1200px) {
  .rn {
    grid-template-columns: minmax(0, 1fr);
    max-width: var(--maxw);
    justify-self: center;
  }
  .rn-article {
    max-width: none;
    justify-self: stretch;
  }
  .rn-pagetoc { display: none; }
}

/* ---- Top bar ------------------------------------------------------------ */
.rn-topbar {
  grid-area: top;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: var(--topbar-h);
  padding: 0 var(--space-5);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  overflow: visible;
}
.rn-topbar-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  border-bottom: 0;
  flex-shrink: 0;
}
.rn-topbar-brand:hover { border-bottom: 0; text-decoration: none; }
.rn-topbar img { height: 34px; width: auto; display: block; }
.rn-topbar .rn-topbar-tag {
  font-family: var(--font-head);
  font-weight: var(--w-semibold);
  font-size: var(--fs-label);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--fg-subtle);
  margin-left: auto;
}

.rn-nav-open-btn {
  display: none;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.65rem;
  cursor: pointer;
}

/* ---- Left sidenav (versions) -------------------------------------------- */
.rn-sidenav {
  grid-area: nav;
  position: sticky;
  top: var(--topbar-h);
  align-self: start;
  height: calc(100vh - var(--topbar-h));
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border-right: 1px solid var(--border);
  z-index: 40;
}
.rn-sidenav-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  /* Match .rn content top padding so "Releases" aligns with page eyebrow */
  padding: var(--space-6) var(--space-4) var(--space-3);
  flex-shrink: 0;
}
.rn-sidenav-label {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.6875rem;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--accent);
}
.rn-sidenav-close {
  display: none;
  margin-left: auto;
  width: 2rem;
  height: 2rem;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--fg-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}
.rn-sidenav-close:hover { color: var(--accent); }
.rn-sidenav-scroll {
  overflow: auto;
  padding: 0 var(--space-3) var(--space-7);
  flex: 1;
}
.rn-sidenav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.rn-sidenav-link {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  padding: 0.45rem 0.65rem;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.8125rem;
  line-height: 1.35;
  color: var(--fg-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  border-bottom: 0;
}
.rn-sidenav-link:hover {
  color: var(--link);
  background: var(--bg-subtle);
  text-decoration: none;
  border-bottom: 0;
}
.rn-sidenav-item.is-active > .rn-sidenav-link,
.rn-sidenav-link[aria-current="page"] {
  color: var(--irex-teal);
  background: var(--teal-wash);
  border-left-color: var(--irex-red);
}
.rn-sidenav-badge {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.5625rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.12rem 0.4rem;
  border-radius: var(--radius-pill);
  background: var(--teal-wash);
  color: var(--irex-teal);
}
.rn-sidenav-item.is-active .rn-sidenav-badge,
.rn-sidenav-link[aria-current="page"] .rn-sidenav-badge {
  background: var(--irex-white);
}

.rn-nav-backdrop {
  display: none;
}

@media (max-width: 900px) {
  .rn-app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "top"
      "main";
  }
  .rn-sidenav {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: min(var(--navw), 88vw);
    z-index: 60;
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }
  html.rn-nav-open .rn-sidenav { transform: translateX(0); }
  .rn-sidenav-close { display: inline-flex; align-items: center; justify-content: center; }
  .rn-nav-open-btn { display: inline-block; }
  .rn-nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(38, 39, 40, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    z-index: 55;
  }
  html.rn-nav-open .rn-nav-backdrop {
    opacity: 1;
    pointer-events: auto;
  }
  html.rn-nav-open { overflow: hidden; }
}

@media (max-width: 960px) {
  .rn-topbar {
    flex-wrap: nowrap;
    gap: var(--space-3);
    padding: 0 var(--space-4);
  }
}

@media (max-width: 640px) {
  .rn { padding: var(--space-5) var(--space-4) var(--space-7); }
  .rn-topbar {
    flex-wrap: nowrap;
    min-height: var(--topbar-h);
    padding: 0 var(--space-4);
  }
}

/* ---- Release header ----------------------------------------------------- */
.rn-header { margin-bottom: var(--space-8); max-width: 46rem; }
.rn-eyebrow {
  font-family: var(--font-head);
  font-weight: var(--w-semibold);
  font-size: var(--fs-label);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 var(--space-3);
}
.rn-title {
  font-family: var(--font-head);
  font-weight: var(--w-bold);
  font-size: var(--docs-title);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-tight);
  margin: 0 0 var(--space-4);
  color: var(--fg);
}
.rn-lead {
  font-size: var(--docs-lead);
  line-height: var(--lh-relaxed);
  color: var(--fg-muted);
  margin: 0;
  max-width: 40rem;
}

/* ---- Feature block ------------------------------------------------------ */
.rn-feature {
  padding: var(--space-7) 0;
  border-top: 1px solid var(--border);
}
.rn-feature:first-of-type { border-top: 0; padding-top: 0; }

/* Feature head: button-style label inline with the title */
.rn-feature-head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  flex-wrap: nowrap;
  margin-bottom: var(--space-5);
}

/* New feature / Improvement — styled like a button, but non-interactive */
.rn-badge {
  display: inline-block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  padding: 0.5rem 1.05rem;
  border-radius: var(--radius-pill);
  cursor: default;
  white-space: nowrap;
}
.rn-badge--new {
  background: var(--badge-new);
  color: var(--badge-new-fg);
}
.rn-badge--improvement {
  background: var(--badge-improve);
  color: var(--badge-improve-fg);
}

.rn-feature-title {
  font-family: var(--font-head);
  font-weight: var(--w-bold);
  font-size: var(--docs-h2);
  line-height: var(--lh-snug);
  margin: 0;
  color: var(--fg);
  flex: 1;
  min-width: 0;
}

/* Copy + image row — text wider on the left, 16:10 screenshot on the right.
   No screenshot → one column so copy uses the full row width (to where
   the image column would end). */
.rn-row {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--space-6);
  align-items: start;
}
.rn-row:not(:has(.rn-shot)) {
  grid-template-columns: 1fr;
}
.rn-row:not(:has(.rn-shot)) .rn-detail p,
.rn-row:not(:has(.rn-shot)) .rn-detail .rn-short {
  max-width: none;
}
.rn-detail { order: 0; min-width: 0; }
.rn-shot { order: 1; min-width: 0; }

/* Screenshot — fixed 16:10 frame; image fits inside (contain).
   Empty letterbox matches the dark matte baked into 4.38+ screenshot PNGs. */
.rn-shot {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  background: #282827;
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
}
.rn-shot > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  cursor: zoom-in;
}

/* Copy: short lead + detailed text + CTA (all beside the image) */
.rn-detail { align-self: center; text-align: justify; text-justify: inter-word; hyphens: auto; }
.rn-detail .rn-short {
  font-family: var(--font-body);
  font-weight: var(--w-medium);
  font-size: var(--fs-lg);
  color: var(--fg);
  margin: 0 0 var(--space-4);
}
.rn-detail p { margin: 0 0 var(--space-4); color: var(--fg); max-width: 46rem; }
.rn-detail p strong { font-weight: var(--w-semibold); color: var(--fg); }

/* Learn more — light text-link CTA with arrow */
.rn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--link);
  text-decoration: none;
  transition: gap 0.15s ease, color 0.15s ease;
}
.rn-cta:hover { color: var(--link-press); gap: 0.6rem; }
.rn-cta .rn-cta-arrow { font-size: 1.05em; line-height: 1; }
.rn-cta[aria-disabled="true"] { opacity: 0.75; pointer-events: none; }

/* ---- Responsive --------------------------------------------------------- */
@media (max-width: 1100px) {
  .rn-row { grid-template-columns: 1fr; gap: var(--space-4); }
}
@media (max-width: 760px) {
  .rn-feature { padding: var(--space-6) 0; }
}