/* ============================================================
   D365 F&O Consulting Hub — hub pages component layer
   Links alongside redesign.css (tokens come from there).
   All 8 hub pages: consulting, lifecycle, modules,
   business-processes, accounting, ai, customizations, advanced.
   ============================================================ */

/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: var(--rd-sans-a);
  font-size: 16px;
  line-height: 1.7;
  color: var(--rd-ink);
  background: var(--rd-cream);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--rd-navy); text-decoration: none; transition: color var(--rd-fast); }
a:hover { color: var(--rd-gold); }
img, svg { max-width: 100%; display: block; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--rd-serif-a);
  font-weight: 400;
  line-height: 1.2;
  color: var(--rd-navy);
  margin: 0 0 0.6em;
  letter-spacing: -0.015em;
}
h1 { font-size: 2.8rem; }
h2 { font-size: 1.85rem; }
h3 { font-size: 1.05rem; font-family: var(--rd-sans-a); font-weight: 600; letter-spacing: 0; }
h4 { font-size: 0.95rem; font-family: var(--rd-sans-a); font-weight: 600; letter-spacing: 0; }

p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.4em; }
li { margin-bottom: 0.4em; line-height: 1.65; }
strong { font-weight: 600; color: var(--rd-ink); }

code {
  font-family: var(--rd-mono);
  font-size: 0.875em;
  background: var(--rd-stone-50);
  padding: 0.1em 0.45em;
  border-radius: 4px;
  color: var(--rd-navy);
}
pre {
  background: var(--rd-stone-50);
  border: 1px solid var(--rd-line);
  padding: 1rem 1.25rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 0 0 1rem;
  font-family: var(--rd-mono);
  font-size: 0.875rem;
}
hr { border: 0; border-top: 1px solid var(--rd-line); margin: 2rem 0; }

/* ── Header (matches index.html rd-header) ── */
.rd-header {
  height: 64px;
  display: flex;
  align-items: center;
  padding: 0;
  border-bottom: 1px solid var(--rd-line);
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(250,248,244,0.92);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
}
.rd-header__inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 56px;
  width: 100%;
  display: flex;
  align-items: center;
  height: 100%;
}
.rd-header__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}
.rd-header__mark {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--rd-gold);
  flex-shrink: 0;
}
.rd-header__name {
  font-family: var(--rd-serif-b);
  font-weight: 400;
  font-size: 15px;
  color: var(--rd-navy);
  letter-spacing: -0.005em;
}
.rd-header__name em {
  color: var(--rd-gold);
  font-family: var(--rd-serif-a);
  font-style: italic;
}
.rd-header__inner > nav { margin-left: auto; }
.rd-header__nav {
  display: flex;
  align-items: center;
  gap: 32px;
  font-family: var(--rd-sans-a);
  font-size: 13px;
  color: var(--rd-ink-3);
  list-style: none;
  margin: 0;
  padding: 0;
}
.rd-header__nav > li { display: flex; align-items: center; }
.rd-header__nav a {
  text-decoration: none;
  color: var(--rd-ink-3);
  transition: color var(--rd-fast);
}
.rd-header__nav a:hover { color: var(--rd-navy); }
.rd-header__nav a.is-active { color: var(--rd-navy); font-weight: 600; }

/* Hub dropdown */
.rd-nav-dropdown { position: relative; list-style: none; }
.rd-nav-dropdown__btn {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--rd-sans-a);
  font-size: 13px;
  color: var(--rd-ink-3);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: color var(--rd-fast);
}
.rd-nav-dropdown__btn:hover { color: var(--rd-navy); }
.rd-nav-dropdown__btn.is-open-btn { color: var(--rd-navy); }
.rd-nav-dropdown__caret {
  display: inline-block;
  font-size: 9px;
  line-height: 1;
  transition: transform 200ms var(--rd-ease-out);
}
.rd-nav-dropdown.is-open .rd-nav-dropdown__caret { transform: rotate(180deg); }
.rd-nav-dropdown__menu {
  display: none;
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 230px;
  background: #fff;
  border: 1px solid var(--rd-line);
  border-radius: 12px;
  padding: 6px;
  box-shadow: 0 12px 32px rgba(14,27,51,0.12);
  z-index: 300;
}
.rd-nav-dropdown.is-open .rd-nav-dropdown__menu { display: block; }
.rd-nav-dropdown__link {
  display: block;
  padding: 9px 14px;
  font-size: 13px;
  color: var(--rd-ink-2);
  text-decoration: none;
  border-radius: 7px;
  transition: background var(--rd-fast), color var(--rd-fast);
}
.rd-nav-dropdown__link:hover { background: var(--rd-stone-50); color: var(--rd-navy); }
.rd-nav-dropdown__link.is-active {
  background: var(--rd-stone-50);
  color: var(--rd-navy);
  font-weight: 600;
}
.rd-nav-dropdown__divider { height: 1px; background: var(--rd-line); margin: 4px 8px; }

/* Book a call CTA */
.rd-header__cta {
  margin-left: 32px;
  background: var(--rd-navy);
  color: #fff;
  border: 0;
  padding: 9px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-family: var(--rd-sans-a);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: background var(--rd-fast), transform var(--rd-fast);
  white-space: nowrap;
  flex-shrink: 0;
}
.rd-header__cta:hover {
  background: var(--rd-navy-500);
  transform: translateY(-1px);
  color: #fff;
}

/* ── Page hero ── */
.hub-hero {
  background: var(--rd-navy);
  padding: 56px 0 60px;
  position: relative;
  overflow: hidden;
}
.hub-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 90% 140% at 100% 60%, rgba(194,144,54,0.07) 0%, transparent 55%);
  pointer-events: none;
}
.hub-hero__inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 56px;
  position: relative;
  z-index: 1;
}
.hub-hero__eyebrow {
  display: inline-block;
  font-family: var(--rd-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rd-gold);
  margin-bottom: 16px;
}
.hub-hero__title {
  font-family: var(--rd-serif-a);
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 400;
  color: #fff;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
  max-width: 780px;
  line-height: 1.1;
}
.hub-hero__lead {
  color: rgba(255,255,255,0.62);
  font-size: 1.05rem;
  max-width: 660px;
  margin: 0;
  line-height: 1.7;
  font-family: var(--rd-sans-a);
}

/* ── Article-page layout ── */
.article-page {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 64px;
  align-items: start;
  max-width: 1320px;
  margin: 0 auto;
  padding: 56px 56px 96px;
}

/* TOC sidebar */
.article-page__toc {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  scrollbar-width: none;
}
.article-page__toc::-webkit-scrollbar { display: none; }

.article-page__toc-title {
  font-family: var(--rd-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rd-gold);
  margin: 0 0 14px;
  font-weight: 500;
}
.article-page__toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.article-page__toc li { margin: 0; }
.article-page__toc a {
  display: block;
  padding: 6px 0 6px 16px;
  font-size: 13px;
  color: var(--rd-ink-3);
  text-decoration: none;
  border-left: 2px solid var(--rd-line);
  transition: color var(--rd-fast), border-color var(--rd-fast);
  line-height: 1.45;
}
.article-page__toc a:hover { color: var(--rd-navy); border-left-color: var(--rd-stone-100); }
.article-page__toc a.is-active {
  color: var(--rd-navy);
  border-left-color: var(--rd-gold);
  font-weight: 500;
}

/* Article content */
.article-page__main > section { margin-bottom: 40px; }
.article-page__main > section:last-child { margin-bottom: 0; }

/* Grid items default to min-width:auto, which would let wide
   content (e.g. an .entry-table-wrap) blow the column past the
   viewport. Forcing min-width:0 lets inner scroll containers work. */
.article-page__toc,
.article-page__main { min-width: 0; }

.article {
  background: var(--rd-paper);
  border: 1px solid var(--rd-line);
  border-radius: 12px;
  padding: 40px;
}
.article h2 {
  font-family: var(--rd-serif-a);
  font-size: 1.85rem;
  font-weight: 400;
  color: var(--rd-navy);
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}
.article h3 {
  font-family: var(--rd-sans-a);
  font-size: 1.0rem;
  font-weight: 600;
  color: var(--rd-navy);
  margin: 1.6rem 0 0.5rem;
}
.article h4 {
  font-family: var(--rd-sans-a);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--rd-ink-2);
  margin: 1.2rem 0 0.4rem;
}
.article__meta {
  font-family: var(--rd-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--rd-gold);
  margin: 0 0 20px;
  display: block;
}
.article__content > *:last-child { margin-bottom: 0; }
.article p { color: var(--rd-ink-2); }
.article li { color: var(--rd-ink-2); }
.article strong { color: var(--rd-ink); }
.article a { color: var(--rd-gold); }
.article a:hover { color: var(--rd-gold-hover); }

/* ── Workspace layout ── */
/* Outer wrapper is full-width, inner .workspace is max-width constrained */
.workspace-outer {
  border-top: 1px solid var(--rd-line);
}
.workspace {
  display: grid;
  grid-template-columns: 260px 1fr;
  align-items: start;
  max-width: 1320px;
  margin: 0 auto;
  min-height: calc(100vh - 64px);
}

/* Sidebar */
.workspace__sidebar {
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--rd-stone-100) transparent;
  border-right: 1px solid var(--rd-line);
  background: var(--rd-paper);
  padding: 28px 0 40px;
}
.workspace__sidebar::-webkit-scrollbar { width: 4px; }
.workspace__sidebar::-webkit-scrollbar-track { background: transparent; }
.workspace__sidebar::-webkit-scrollbar-thumb { background: var(--rd-stone-100); border-radius: 2px; }

/* Mobile toggle (hidden on desktop). On phones this is the
   primary section switcher for hub pages — must look like an
   interactive picker, not a static banner. */
.workspace__sidebar-toggle {
  display: none;
  width: 100%;
  background: var(--rd-navy);
  color: #fff;
  border: 0;
  padding: 26px 20px 14px;
  font-family: var(--rd-sans-a);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  align-items: center;
  gap: 12px;
  position: relative;
}
/* Tiny eyebrow label above the current item so the picker reads as
   "this section / tap to change", not as a page heading. */
.workspace__sidebar-toggle::before {
  content: attr(data-toggle-label);
  position: absolute;
  top: 10px;
  left: 20px;
  font-family: var(--rd-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rd-gold);
  font-weight: 500;
}
/* Chevron indicating it opens a list; rotates when sidebar is open. */
.workspace__sidebar-toggle::after {
  content: "";
  margin-left: auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(45deg);
  transition: transform 220ms var(--rd-ease-out);
  flex-shrink: 0;
}
.workspace__sidebar.is-open .workspace__sidebar-toggle::after {
  transform: rotate(-135deg);
}
.workspace__sidebar-toggle:hover { background: var(--rd-navy-700); }
.workspace__sidebar-current {
  font-weight: 600;
  font-size: 16px;
  line-height: 1.2;
}

.workspace__sidebar-title {
  font-family: var(--rd-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rd-gold);
  padding: 0 24px 12px;
  margin: 0;
  display: block;
}
.workspace__nav {
  list-style: none;
  margin: 0;
  padding: 0;
}
.workspace__nav-item { margin: 0; }
.workspace__nav-link {
  display: block;
  padding: 8px 24px;
  font-size: 13.5px;
  color: var(--rd-ink-3);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--rd-fast), border-color var(--rd-fast), background var(--rd-fast);
  line-height: 1.4;
}
.workspace__nav-link:hover {
  color: var(--rd-navy);
  background: var(--rd-stone-50);
  border-left-color: var(--rd-stone-100);
}
.workspace__nav-link.is-active {
  color: var(--rd-navy);
  font-weight: 600;
  border-left-color: var(--rd-gold);
  background: rgba(194,144,54,0.06);
}

/* Main content area */
.workspace__main {
  padding: 48px 64px 96px;
  min-height: calc(100vh - 64px);
  /* Grid items default to min-width:auto, which lets wide content
     (e.g. an .entry-table with min-width:1000px) blow the column
     past the viewport. Forcing min-width:0 lets the inner
     .entry-table-wrap actually become the scroll container. */
  min-width: 0;
}

/* Item panes — only one shown at a time (app.js controls) */
.item-pane { display: none; }
.item-pane.is-active { display: block; }

.item-pane__header {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--rd-line);
}
.item-pane__eyebrow {
  display: inline-block;
  font-family: var(--rd-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rd-gold);
  margin-bottom: 12px;
}
.item-pane__title {
  font-family: var(--rd-serif-a);
  font-size: 2.2rem;
  font-weight: 400;
  color: var(--rd-navy);
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}
.item-pane__lead {
  color: var(--rd-ink-3);
  font-size: 1.05rem;
  margin: 0;
  max-width: 640px;
  line-height: 1.65;
}

/* Pane body typography */
.item-pane > p,
.item-pane > ul,
.item-pane > ol { color: var(--rd-ink-2); }
.item-pane strong { color: var(--rd-ink); }
.item-pane a { color: var(--rd-gold); }
.item-pane a:hover { color: var(--rd-gold-hover); }
.item-pane h2 {
  font-family: var(--rd-serif-a);
  font-size: 1.85rem;
  font-weight: 400;
  color: var(--rd-navy);
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}
.item-pane h3 {
  font-family: var(--rd-sans-a);
  font-size: 1.0rem;
  font-weight: 600;
  color: var(--rd-navy);
  margin: 1.5rem 0 0.5rem;
}
.item-pane h4 {
  font-family: var(--rd-sans-a);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--rd-ink-2);
  margin: 1.2rem 0 0.4rem;
}

/* ── details.topic expandable sections ── */
.topics {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 24px;
}
details.topic {
  border: 1px solid var(--rd-line);
  border-radius: 10px;
  background: var(--rd-paper);
  overflow: hidden;
}
details.topic > summary {
  list-style: none;
  padding: 14px 20px 14px 16px;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  user-select: none;
  font-family: var(--rd-sans-a);
  font-weight: 500;
  font-size: 14.5px;
  color: var(--rd-navy);
  transition: background var(--rd-fast);
}
details.topic > summary::-webkit-details-marker { display: none; }
details.topic > summary::after {
  content: '▾';
  font-size: 11px;
  color: var(--rd-gold);
  margin-left: auto;
  flex-shrink: 0;
  transition: transform 200ms var(--rd-ease-out);
  align-self: center;
}
details[open].topic > summary::after { transform: rotate(180deg); }
details.topic > summary:hover { background: var(--rd-stone-50); }

.topic__eyebrow {
  display: block;
  font-family: var(--rd-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rd-gold);
  margin-bottom: 2px;
  font-weight: 400;
}
.topic__body {
  padding: 4px 20px 20px 20px;
  border-top: 1px solid var(--rd-line);
}
details[open] .topic__body {
  animation: topic-open 460ms var(--rd-ease-snap) both;
}
@keyframes topic-open {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: none; }
}
@keyframes topic-close {
  from { opacity: 1; transform: none; }
  to   { opacity: 0; transform: translateY(10px); }
}
.topic__body > *:first-child { margin-top: 16px; }
.topic__body > *:last-child { margin-bottom: 0; }
.topic__body p { color: var(--rd-ink-2); font-size: 15px; }
.topic__body li { color: var(--rd-ink-2); font-size: 15px; }
.topic__body strong { color: var(--rd-ink); }
.topic__body a { color: var(--rd-gold); }
.topic__body a:hover { color: var(--rd-gold-hover); }
.topic__body h3 {
  font-family: var(--rd-sans-a);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--rd-navy);
  margin: 1.2rem 0 0.4rem;
}
.topic__body h4 {
  font-family: var(--rd-sans-a);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--rd-ink-2);
  margin: 1rem 0 0.35rem;
}

/* ── Callout box ── */
.callout {
  background: rgba(194,144,54,0.06);
  border-left: 3px solid var(--rd-gold);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin-bottom: 24px;
}
.callout p {
  color: var(--rd-ink-2);
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
}
.callout strong { color: var(--rd-navy); }

/* ── Mermaid diagram wrapper ── */
.mermaid-wrap {
  margin: 24px 0;
  background: var(--rd-paper);
  border: 1px solid var(--rd-line);
  border-radius: 10px;
  padding: 24px;
  overflow-x: auto;
}
.mermaid-wrap h4 {
  margin-top: 0 !important;
  font-size: 0.92rem;
  color: var(--rd-ink-2);
  margin-bottom: 16px !important;
}
/* Keep existing inline Mermaid container styles working */
[style*="border-radius: 8px"][style*="border: 1px solid"] {
  background: var(--rd-paper) !important;
  border-color: var(--rd-line) !important;
  border-radius: 10px !important;
}

/* ── Entry table (accounting Dr/Cr journals) ── */
.entry-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 16px 0 24px;
  /* Hint to the user that this region scrolls horizontally. */
  scrollbar-width: thin;
}
.entry-table-wrap .entry-table { margin: 0; }
.entry-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 14px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--rd-line);
}
.entry-table th {
  background: var(--rd-navy);
  color: rgba(255,255,255,0.88);
  font-family: var(--rd-sans-a);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 10px 14px;
  text-align: left;
}
.entry-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--rd-line);
  color: var(--rd-ink-2);
  vertical-align: top;
  line-height: 1.55;
}
.entry-table tr:nth-child(even) td { background: var(--rd-stone-50); }
.entry-table tr:last-child td { border-bottom: 0; }
.entry-table td:nth-child(2),
.entry-table td:nth-child(3) {
  font-family: var(--rd-mono);
  font-size: 13px;
}

/* ── Article-page meta ── */
.article__meta {
  font-family: var(--rd-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--rd-gold);
  margin-bottom: 20px;
  display: block;
}

/* ── Footer (matches index.html / portfolio.html rd-footer) ── */
.rd-footer {
  padding: 40px 56px;
  background: var(--rd-cream);
  border-top: 1px solid var(--rd-line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--rd-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--rd-ink-3);
}
.rd-footer__links { display: flex; gap: 24px; }
.rd-footer__links a {
  color: var(--rd-ink-3);
  text-decoration: none;
  transition: color var(--rd-fast);
}
.rd-footer__links a:hover { color: var(--rd-navy); }

/* Hide the old app.js-injected footer if it fires */
.site-footer[data-footer] { display: none !important; }

/* ── Workspace pane switch animation ── */
@keyframes pane-in {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: none; }
}

/* Container fades/slides in */
.item-pane.is-active {
  animation: pane-in 480ms var(--rd-ease-snap) both;
}

/* Header cascades slightly after the container */
.item-pane.is-active .item-pane__header {
  animation: pane-in 500ms var(--rd-ease-snap) both;
  animation-delay: 60ms;
}

/* First block of body content (callout, leading paragraph) */
.item-pane.is-active > .callout,
.item-pane.is-active > p {
  animation: pane-in 500ms var(--rd-ease-snap) both;
  animation-delay: 120ms;
}

/* Topic list and diagrams */
.item-pane.is-active > .topics,
.item-pane.is-active > .mermaid-wrap,
.item-pane.is-active > ul,
.item-pane.is-active > ol {
  animation: pane-in 500ms var(--rd-ease-snap) both;
  animation-delay: 180ms;
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  .rd-header__inner { padding: 0 32px; }
  .hub-hero__inner { padding: 0 32px; }
  .article-page { padding: 48px 32px 80px; gap: 48px; }
  .workspace__main { padding: 40px 40px 80px; }
  .hub-footer__inner { padding: 0 32px; }
}

@media (max-width: 900px) {
  /* Article page: stack TOC above content */
  .article-page {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px 24px 64px;
  }
  .article-page__toc {
    position: static;
    max-height: none;
  }
  .article { padding: 24px; }

  /* Workspace: stack sidebar above pane */
  .workspace { grid-template-columns: 1fr; }
  .workspace__sidebar {
    position: sticky;
    top: 64px;
    z-index: 50;
    height: auto;
    overflow-y: visible;
    border-right: 0;
    border-bottom: 1px solid var(--rd-line);
    padding: 0;
    background: var(--rd-paper);
  }
  .workspace__sidebar-body {
    display: none;
    background: var(--rd-cream);
    border-top: 1px solid var(--rd-line);
  }
  .workspace__sidebar.is-open .workspace__sidebar-body {
    display: block;
    padding: 12px 0;
    max-height: 60vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .workspace__sidebar.is-open .workspace__sidebar-title { display: none; }
  .workspace__sidebar-toggle { display: flex; }
  /* Bigger tap targets and clearer active state on mobile. */
  .workspace__sidebar.is-open .workspace__nav-link {
    padding: 12px 24px;
    font-size: 15px;
    min-height: 44px;
    display: flex;
    align-items: center;
  }
  .workspace__sidebar.is-open .workspace__nav-link.is-active {
    background: var(--rd-stone-50);
  }
  .workspace__main { padding: 32px 24px 64px; }

  /* Header: keep brand + Hub dropdown + CTA; hide secondary links only */
  .rd-header__nav { gap: 16px; }
  .rd-header__nav > li:not(.rd-nav-dropdown) { display: none; }
  .rd-header__cta { margin-left: 16px; padding: 8px 14px; font-size: 12px; }
  .rd-header__inner { padding: 0 24px; }

  /* Hero */
  .hub-hero { padding: 40px 0; }
  .hub-hero__inner { padding: 0 24px; }
  .hub-hero__title { font-size: 1.75rem; }

  /* Footer */
  .rd-footer { padding: 32px 24px; flex-direction: column; gap: 16px; text-align: center; }
}

@media (max-width: 600px) {
  h2 { font-size: 1.4rem; }
  .item-pane__title { font-size: 1.7rem; }

  /* Tighter side padding on phones so content uses available width. */
  .rd-header__inner { padding: 0 16px; }
  .hub-hero__inner { padding: 0 16px; }
  .hub-footer__inner { padding: 0 16px; }
  .article-page { padding: 24px 16px 48px; gap: 24px; }
  .article { padding: 16px; }
  .workspace__main { padding: 24px 16px 48px; }

  /* Hero scales down on phones. */
  .hub-hero { padding: 28px 0 24px; }
  .hub-hero__title { font-size: 1.5rem; line-height: 1.2; }
  .hub-hero__lead { font-size: 0.95rem; }

  /* Footer stays stacked, with smaller padding. */
  .rd-footer { padding: 24px 16px; }
}