/* =========================================================================
   Design tokens
   A Fluent-inspired ramp: neutral surfaces, one communication blue accent,
   small radii, and layered depth instead of heavy drop shadows.
   ========================================================================= */

:root {
  --brand: #0f6cbd;
  --brand-hover: #115ea3;
  --brand-strong: #0c3b5e;
  --brand-tint: #eff6fc;
  --brand-tint-strong: #dceefb;

  --ink: #242424;
  --heading: #1b1a19;
  --muted: #57606a;
  --subtle: #6e7681;

  --canvas: #faf9f8;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --surface-soft: #f3f2f1;
  --surface-sunken: #f5f6f8;

  --border: #e1dfdd;
  --border-strong: #c8c6c4;
  --header-bg: rgba(255, 255, 255, 0.94);

  --code-bg: #1b1a19;
  --code-fg: #f3f2f1;

  --success: #0e700e;
  --success-tint: #e9f5e9;
  --alert: #a4262c;
  --alert-tint: #fdf3f4;
  --warning: #8a5300;

  --on-brand: #ffffff;
  --focus: #0f6cbd;
  --focus-contrast: #ffffff;

  --shadow-2: 0 1px 2px rgba(0, 0, 0, 0.09), 0 0 1px rgba(0, 0, 0, 0.08);
  --shadow-4: 0 2px 4px rgba(0, 0, 0, 0.1), 0 0 2px rgba(0, 0, 0, 0.07);
  --shadow-8: 0 4px 12px rgba(0, 0, 0, 0.12), 0 0 2px rgba(0, 0, 0, 0.07);

  --radius-sm: 4px;
  --radius: 6px;
  --radius-lg: 8px;

  --shell-gutter: clamp(1rem, 3vw, 3rem);
  --rail-width: clamp(15rem, 19vw, 19rem);
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.375rem;
  --step-3: 1.75rem;
  --step-4: clamp(1.9rem, 1.3rem + 1.9vw, 2.75rem);
  --step-5: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);

  color-scheme: light;
}

:root[data-theme='dark'] {
  --brand: #6cb8f6;
  --brand-hover: #93c9f8;
  --brand-strong: #c2e2fb;
  --brand-tint: #12293f;
  --brand-tint-strong: #17364f;

  --ink: #e6e6e6;
  --heading: #ffffff;
  --muted: #b3b3b3;
  --subtle: #a0a0a0;

  --canvas: #141414;
  --surface: #1f1f1f;
  --surface-raised: #242424;
  --surface-soft: #2b2b2b;
  --surface-sunken: #1a1a1a;

  --border: #3b3b3b;
  --border-strong: #545454;
  --header-bg: rgba(31, 31, 31, 0.94);

  --code-bg: #0d0d0d;
  --code-fg: #e6e6e6;

  --success: #6ccb5f;
  --success-tint: #14290f;
  --alert: #ff9aa2;
  --alert-tint: #35191c;
  --warning: #f2c661;

  --on-brand: #0b1a29;
  --focus: #93c9f8;
  --focus-contrast: #0b1a29;

  --shadow-2: 0 1px 2px rgba(0, 0, 0, 0.5), 0 0 1px rgba(0, 0, 0, 0.4);
  --shadow-4: 0 2px 6px rgba(0, 0, 0, 0.55), 0 0 2px rgba(0, 0, 0, 0.4);
  --shadow-8: 0 6px 16px rgba(0, 0, 0, 0.6), 0 0 2px rgba(0, 0, 0, 0.4);

  color-scheme: dark;
}

/* =========================================================================
   Base
   ========================================================================= */

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: "Segoe UI", SegoeUI, system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: var(--step-0);
  line-height: 1.6;
  overflow-wrap: break-word;
}

a {
  color: var(--brand);
  text-decoration: none;
}

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

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

/* Class rules that set `display` would otherwise beat the user agent's
   `[hidden]` rule, so progressive-enhancement toggles need this guard. */
[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

::selection {
  background: var(--brand-tint-strong);
  color: var(--heading);
}

.page-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* =========================================================================
   Top bar
   ========================================================================= */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  min-height: 3.25rem;
  padding: 0.5rem var(--shell-gutter);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 40;
  border-radius: var(--radius);
  background: var(--brand);
  color: var(--on-brand);
  font-weight: 600;
  padding: 0.6rem 1rem;
}

.skip-link:focus {
  top: 0.6rem;
  color: var(--on-brand);
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
  color: var(--heading);
}

.brand {
  margin-right: auto;
  border-radius: var(--radius);
  padding: 0.15rem 0.1rem;
}

.brand:hover {
  color: var(--brand-hover);
  text-decoration: none;
}

.brand-copy,
.footer-brand > span:last-child {
  display: grid;
  min-width: 0;
}

.brand-copy strong,
.footer-brand strong {
  color: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.25;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-copy small,
.footer-brand small {
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ms-logo {
  display: grid;
  flex: 0 0 auto;
  grid-template-columns: repeat(2, 0.62rem);
  grid-template-rows: repeat(2, 0.62rem);
  gap: 0.14rem;
}

.ms-logo span:nth-child(1) {
  background: #f25022;
}

.ms-logo span:nth-child(2) {
  background: #7fba00;
}

.ms-logo span:nth-child(3) {
  background: #00a4ef;
}

.ms-logo span:nth-child(4) {
  background: #ffb900;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.source-button,
.theme-toggle,
.nav-toggle,
.browse-filter-toggle,
.browse-clear {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 2rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--heading);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.source-button:hover,
.theme-toggle:hover,
.nav-toggle:hover,
.browse-filter-toggle:hover,
.browse-clear:hover {
  border-color: var(--brand);
  background: var(--brand-tint);
  color: var(--brand-hover);
  text-decoration: none;
}

.theme-toggle {
  width: 2rem;
  padding: 0;
  font-size: 0.95rem;
}

.nav-toggle {
  order: -1;
}

.nav-toggle-glyph {
  display: grid;
  gap: 3px;
  width: 0.95rem;
}

.nav-toggle-glyph span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle[aria-expanded='true'] {
  border-color: var(--brand);
  background: var(--brand-tint);
  color: var(--brand-hover);
}

/* =========================================================================
   Shell layout
   ========================================================================= */

.content-shell {
  display: grid;
  grid-template-columns: var(--rail-width) minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  flex: 1 0 auto;
  width: 100%;
  padding: 0 var(--shell-gutter) 4rem;
}

.sidebar {
  align-self: start;
  position: sticky;
  top: 3.25rem;
  max-height: calc(100vh - 3.25rem);
  overflow: auto;
  overscroll-behavior: contain;
  border-right: 1px solid var(--border);
  padding: 1.75rem 1.25rem 2rem 0;
  scrollbar-width: thin;
}

.sidebar-inner {
  min-width: 0;
}

.sidebar-heading {
  margin-bottom: 0.75rem;
}

.sidebar-heading h2,
.section-heading h2 {
  margin: 0;
  color: var(--heading);
  font-size: 1rem;
  font-weight: 600;
}

.eyebrow {
  margin: 0 0 0.3rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.main-content {
  min-width: 0;
  padding-top: 1.75rem;
}

/* =========================================================================
   Navigation tree
   ========================================================================= */

.nav-tree {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-tree .nav-tree {
  border-left: 1px solid var(--border);
  margin: 0.1rem 0 0.3rem 0.75rem;
  padding-left: 0.5rem;
}

.nav-tree li {
  margin: 1px 0;
}

.nav-tree a {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  min-height: 2rem;
  border-radius: var(--radius-sm);
  color: var(--ink);
  font-size: 0.9rem;
  gap: 0.4rem;
  padding: 0.3rem 0.5rem;
  min-width: 0;
}

.nav-tree a:hover {
  background: var(--surface-soft);
  color: var(--brand-hover);
  text-decoration: none;
}

.nav-tree details {
  width: 100%;
}

.nav-tree summary {
  display: flex;
  align-items: center;
  list-style: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

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

.nav-tree summary::before {
  content: "";
  flex: 0 0 auto;
  width: 0.34rem;
  height: 0.34rem;
  margin: 0 0.15rem 0 0.4rem;
  border-right: 1.5px solid var(--subtle);
  border-bottom: 1.5px solid var(--subtle);
  transform: rotate(-45deg);
  transition: transform 120ms ease;
}

.nav-tree details[open] > summary::before {
  transform: rotate(45deg);
}

.nav-tree li.is-current > a,
.nav-tree li.is-current > details > summary > a {
  background: var(--brand-tint);
  color: var(--brand-hover);
  font-weight: 600;
  box-shadow: inset 2px 0 0 var(--brand);
}

.nav-tree li.is-ancestor > details > summary > a {
  color: var(--heading);
  font-weight: 600;
}

/* =========================================================================
   Hero and page headers
   ========================================================================= */

.hero {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(120deg, var(--brand-tint) 0%, var(--surface) 62%),
    var(--surface);
  box-shadow: var(--shadow-2);
  margin-bottom: 2rem;
  padding: clamp(1.75rem, 4vw, 3.25rem);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 108, 189, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 108, 189, 0.06) 1px, transparent 1px);
  background-size: 2.5rem 2.5rem;
  mask-image: linear-gradient(115deg, black, transparent 68%);
  pointer-events: none;
}

:root[data-theme='dark'] .hero-grid {
  background-image:
    linear-gradient(rgba(108, 184, 246, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108, 184, 246, 0.08) 1px, transparent 1px);
}

.hero-copy,
.hero-summary {
  position: relative;
}

.hero h1 {
  margin: 0;
  color: var(--heading);
  font-size: var(--step-5);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.hero .lede {
  max-width: 60ch;
}

.hero-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1rem;
}

.page-header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.75rem;
  padding-bottom: 1.5rem;
}

.page-header h1,
.section-heading h2 {
  margin: 0;
  color: var(--heading);
  font-size: var(--step-4);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.section-heading h2 {
  font-size: var(--step-3);
}

.lede {
  max-width: 70ch;
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: var(--step-1);
  line-height: 1.55;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem 0.4rem;
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.breadcrumbs a,
.breadcrumbs span[aria-current] {
  display: inline-flex;
  align-items: center;
  min-height: 1.5rem;
  border-radius: var(--radius-sm);
}

.breadcrumbs span[aria-current] {
  color: var(--heading);
  font-weight: 600;
}

.breadcrumbs span[aria-hidden] {
  color: var(--border-strong);
}

/* =========================================================================
   Prose
   ========================================================================= */

.page-body {
  min-width: 0;
}

.prose {
  max-width: none;
}

.prose > :first-child {
  margin-top: 0;
}

.prose :where(h2, h3, h4, h5) {
  color: var(--heading);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.25;
  scroll-margin-top: 4.5rem;
}

.prose h2 {
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
  font-size: var(--step-3);
}

.prose h3 {
  margin: 2rem 0 0.6rem;
  font-size: var(--step-2);
}

.prose h4 {
  margin: 1.5rem 0 0.5rem;
  font-size: var(--step-1);
}

.prose p,
.prose li {
  color: var(--ink);
}

.prose p {
  margin: 0 0 1rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem;
  padding-left: 1.4rem;
}

.prose li {
  margin: 0.3rem 0;
}

.prose code {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  color: var(--heading);
  font-family: ui-monospace, SFMono-Regular, "Cascadia Mono", Consolas, monospace;
  font-size: 0.88em;
  padding: 0.08rem 0.32rem;
}

.prose pre {
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--code-bg);
  color: var(--code-fg);
  font-size: 0.9rem;
  padding: 1rem 1.1rem;
  tab-size: 2;
}

.prose pre code {
  border: 0;
  background: none;
  color: inherit;
  font-size: inherit;
  padding: 0;
}

.prose blockquote {
  border-left: 3px solid var(--brand);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--surface-soft);
  margin: 1.25rem 0;
  padding: 0.75rem 1rem;
  color: var(--muted);
}

.prose blockquote > :last-child {
  margin-bottom: 0;
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* =========================================================================
   Cards
   ========================================================================= */

.summary-card,
.page-card,
.browse-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
}

.summary-card {
  display: grid;
  align-content: start;
  gap: 0.25rem;
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow-2);
}

.summary-card-primary {
  border-color: var(--brand);
  background: var(--brand);
  color: var(--on-brand);
}

.summary-card span,
.page-card span {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.summary-card-primary span,
.summary-card-primary small {
  color: color-mix(in srgb, var(--on-brand) 78%, transparent);
}

.summary-card strong {
  color: inherit;
  font-size: var(--step-2);
  font-weight: 600;
  line-height: 1.2;
}

.summary-card small,
.page-card small {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.section-grid {
  display: grid;
  gap: 1rem;
  margin-top: 2.5rem;
}

.section-heading {
  margin-bottom: 0.25rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  gap: 1rem;
}

.page-card {
  display: grid;
  align-content: start;
  gap: 0.35rem;
  padding: 1.1rem 1.2rem;
  color: var(--ink);
  box-shadow: var(--shadow-2);
  transition: border-color 140ms ease, box-shadow 140ms ease, transform 140ms ease;
}

.page-card:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow-8);
  text-decoration: none;
  transform: translateY(-1px);
}

.page-card strong {
  color: var(--heading);
  font-size: var(--step-1);
  font-weight: 600;
  line-height: 1.3;
}

.page-card:hover strong {
  color: var(--brand-hover);
}

/* =========================================================================
   Browse (catalog): search, facets, results
   ========================================================================= */

.browse {
  margin: 1.5rem 0 0;
}

.browse-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.browse-search {
  position: relative;
  flex: 1 1 18rem;
  min-width: 0;
  max-width: 30rem;
}

.browse-search-icon {
  position: absolute;
  left: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--subtle);
  font-size: 1.1rem;
  pointer-events: none;
}

.browse-search input {
  width: 100%;
  min-height: 2.4rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 0.92rem;
  padding: 0.4rem 0.75rem 0.4rem 2.1rem;
}

.browse-search input::placeholder {
  color: var(--subtle);
}

.browse-search input:focus-visible {
  border-color: var(--brand);
  outline: 2px solid var(--focus);
  outline-offset: 1px;
}

.browse-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

.browse-rail {
  min-width: 0;
}

.browse-filters {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1rem 1.1rem;
}

.browse-filters-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.browse-filters-head h2 {
  margin: 0;
  color: var(--heading);
  font-size: 0.95rem;
  font-weight: 600;
}

.browse-clear {
  min-height: 1.75rem;
  border-color: transparent;
  background: none;
  color: var(--brand);
  font-size: 0.82rem;
  padding: 0.15rem 0.4rem;
}

.facet {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 0;
  padding: 0.85rem 0 0;
}

.facet + .facet {
  margin-top: 0.85rem;
}

.facet legend {
  color: var(--heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 0;
  text-transform: uppercase;
}

.facet-options {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
}

.facet-option {
  display: flex;
  align-items: stretch;
}

.facet-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1 1 auto;
  min-height: 1.75rem;
  padding: 0.15rem 0.25rem;
  margin-inline-start: -0.25rem;
  border-radius: var(--radius-sm);
  color: var(--ink);
  font-size: 0.88rem;
  cursor: pointer;
}

.facet-text {
  flex: 1 1 auto;
}

.facet-option input {
  flex: 0 0 auto;
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--brand);
}

.facet-label:hover {
  background: var(--surface-soft);
  color: var(--brand-hover);
}

.facet-option input:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

.facet-count {
  color: var(--subtle);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.browse-results {
  min-width: 0;
}

.browse-count {
  margin: 0 0 0.85rem;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 600;
}

.browse-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr));
  gap: 1rem;
}

.browse-card {
  display: grid;
  align-content: start;
  gap: 0.6rem;
  padding: 1.15rem 1.25rem 1.25rem;
  box-shadow: var(--shadow-2);
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.browse-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-4);
}

.browse-card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.browse-card-head .eyebrow {
  margin: 0;
  color: var(--brand-hover);
}

.browse-card-title {
  margin: 0;
  font-size: var(--step-1);
  font-weight: 600;
  line-height: 1.3;
}

.browse-card-title a {
  color: var(--heading);
}

.browse-card-title a:hover {
  color: var(--brand-hover);
}

.browse-card-description {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.browse-card-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr));
  gap: 0.6rem 1rem;
  margin: 0.15rem 0 0;
}

.browse-card-facts dt,
.browse-card-audience span {
  color: var(--subtle);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.browse-card-facts dd {
  margin: 0.1rem 0 0;
  color: var(--ink);
  font-size: 0.9rem;
}

.browse-card-audience {
  margin: 0;
  color: var(--ink);
  font-size: 0.9rem;
}

.browse-card-audience span {
  display: block;
  margin-bottom: 0.1rem;
}

.browse-card-stages {
  border-top: 1px solid var(--border);
  margin-top: 0.25rem;
  padding-top: 0.75rem;
}

.browse-card-stages-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin: 0 0 0.5rem;
  color: var(--subtle);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.browse-card-stages-label span {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  text-transform: none;
}

.browse-empty {
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  margin: 0;
  padding: 1.25rem;
  color: var(--muted);
}

.catalog-empty {
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 1.25rem;
  color: var(--muted);
}

/* =========================================================================
   Offering header
   ========================================================================= */

.prose-wide {
  max-width: none;
}

.offering-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: 0.9rem 1.5rem;
  margin: 1.5rem 0 0;
}

.offering-meta dt {
  color: var(--subtle);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.offering-meta dd {
  margin: 0.15rem 0 0;
  color: var(--ink);
  font-size: 0.94rem;
}

.offering-tags,
.stage-badges,
.stage-legend,
.resource-list,
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.offering-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.15rem;
}

.offering-tags li,
.resource-type,
.resource-audience,
.stage-flag,
.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 1.5rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.1rem 0.5rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* =========================================================================
   Timeline
   ========================================================================= */

.timeline-wrap {
  margin-top: 2.75rem;
}

.timeline-wrap .section-heading h2 {
  font-size: var(--step-3);
}

.timeline {
  margin-top: 1.5rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  grid-template-areas:
    'separator opposite'
    'separator content';
  column-gap: 0.75rem;
}

.timeline-opposite {
  grid-area: opposite;
  padding-bottom: 0.35rem;
}

.timeline-separator {
  grid-area: separator;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.timeline-content {
  grid-area: content;
  padding-bottom: 1.25rem;
}

.timeline-item:last-child .timeline-content {
  padding-bottom: 0;
}

.timeline-dot {
  display: grid;
  place-items: center;
  flex: none;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--brand);
  border-radius: 999px;
  background: var(--brand);
  color: var(--on-brand);
  font-size: 0.88rem;
  font-weight: 600;
}

.timeline-connector {
  flex: 1;
  width: 2px;
  min-height: 1.25rem;
  margin: 0.35rem 0;
  border-radius: 2px;
  background: var(--border);
}

.timeline-item.is-muted .timeline-dot {
  border-color: var(--border-strong);
  background: var(--surface-soft);
  color: var(--muted);
}

.timeline-anchor {
  margin: 0;
  color: var(--heading);
  font-family: ui-monospace, SFMono-Regular, "Cascadia Mono", Consolas, monospace;
  font-size: 0.84rem;
  font-weight: 600;
}

.timeline-phase {
  margin: 0.1rem 0 0;
  color: var(--subtle);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.timeline-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  box-shadow: var(--shadow-2);
  padding: 1.1rem 1.25rem;
}

.timeline-item.is-muted .timeline-card {
  background: transparent;
  border-style: dashed;
  box-shadow: none;
}

.stage-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}

.prose .stage-header h3 {
  margin: 0;
  font-size: var(--step-1);
}

.stage-flags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
}

.stage-flag-core {
  border-color: transparent;
  background: var(--brand-tint);
  color: var(--brand-hover);
}

.stage-flag-muted {
  border-style: dashed;
}

.stage-owner {
  margin: 0.6rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.stage-owner span {
  margin-right: 0.4rem;
  color: var(--subtle);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.prose .stage-purpose {
  margin: 0.6rem 0 0;
}

.stage-empty {
  margin: 0.6rem 0 0;
  color: var(--muted);
  font-style: italic;
}

.stage-sections {
  display: grid;
  gap: 1.1rem;
  margin-top: 1.25rem;
}

.prose .stage-section h4 {
  margin: 0 0 0.4rem;
  color: var(--subtle);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.stage-section > ul,
.stage-section > ol {
  margin: 0;
  padding-left: 1.2rem;
}

.stage-section > p {
  margin: 0.35rem 0;
}

/* =========================================================================
   Stage resources
   ========================================================================= */

.resource-list {
  display: grid;
  gap: 0.6rem;
}

.resource {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.75rem 0.9rem;
}

.resource-name {
  margin: 0;
  color: var(--heading);
  font-weight: 600;
}

.resource-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.5rem 0 0;
}

.resource-audience.audience-internal {
  border-color: var(--alert);
  background: var(--alert-tint);
  color: var(--alert);
}

.resource-link {
  margin: 0.5rem 0 0;
  font-size: 0.92rem;
}

.resource-link a {
  display: inline-flex;
  align-items: center;
  min-height: 1.5rem;
}

/* =========================================================================
   Tables
   ========================================================================= */

.table-scroll {
  overflow-x: auto;
  max-width: 100%;
  margin: 1.25rem 0;
  border-radius: var(--radius-sm);
}

.table-scroll:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

.prose table:not(.framework-table) {
  width: max-content;
  max-width: 100%;
  margin: 0;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.prose table:not(.framework-table) th,
.prose table:not(.framework-table) td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.prose table:not(.framework-table) thead th {
  background: var(--surface-soft);
  color: var(--heading);
  font-weight: 600;
}

.framework-scroll {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  margin: 1.25rem 0;
  overflow: hidden;
}

.framework-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

.framework-table th,
.framework-table td {
  border-bottom: 1px solid var(--border);
  padding: 0.7rem 0.85rem;
  text-align: left;
  vertical-align: top;
}

.framework-table thead th {
  background: var(--surface-soft);
  color: var(--heading);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.framework-table tbody tr:last-child th,
.framework-table tbody tr:last-child td {
  border-bottom: none;
}

.framework-table th[scope='row'] {
  color: var(--heading);
  font-weight: 600;
}

.framework-table .cell-number {
  width: 1px;
  padding-right: 0;
}

.cell-empty {
  color: var(--subtle);
}

/* Stacked layout keeps the framework reference readable on small screens. */
@media (max-width: 767px) {
  .framework-scroll {
    border: 0;
    background: none;
  }

  .framework-table,
  .framework-table tbody,
  .framework-table tr,
  .framework-table th,
  .framework-table td {
    display: block;
    width: auto;
  }

  .framework-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
  }

  .framework-table tr {
    position: relative;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-raised);
    margin-bottom: 0.75rem;
    padding: 0.85rem 1rem 0.85rem 3rem;
  }

  .framework-table th,
  .framework-table td {
    border-bottom: 0;
    padding: 0.2rem 0;
  }

  .framework-table .cell-number {
    position: absolute;
    left: 1rem;
    top: 0.85rem;
    width: auto;
    padding: 0;
  }

  .framework-table th[scope='row'] {
    font-size: var(--step-0);
    padding-bottom: 0.4rem;
  }

  .framework-table td[data-label]::before {
    content: attr(data-label);
    display: block;
    color: var(--subtle);
    font-size: 0.66rem;
    font-weight: 600;
    letter-spacing: 0.07em;
    text-transform: uppercase;
  }
}

/* =========================================================================
   Stage badges
   ========================================================================= */

.stage-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.stage-badge {
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--subtle);
  font-size: 0.7rem;
  font-weight: 600;
}

.stage-badge-represented {
  border-color: var(--brand);
  background: var(--brand);
  color: var(--on-brand);
}

.stage-badge-absent {
  opacity: 0.45;
}

.stage-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8rem;
}

.stage-legend li {
  display: inline-flex;
  align-items: center;
  min-height: 1.5rem;
  gap: 0.4rem;
}

.stage-legend .stage-badge {
  width: 1.35rem;
  height: 1.35rem;
  font-size: 0.66rem;
}

/* =========================================================================
   Status
   ========================================================================= */

.status-pill {
  color: var(--muted);
}

.status-published {
  border-color: var(--success);
  background: var(--success-tint);
  color: var(--success);
}

.status-draft,
.status-review {
  border-style: dashed;
}

.status-retired {
  border-color: var(--alert);
  background: var(--alert-tint);
  color: var(--alert);
}

/* =========================================================================
   Footer
   ========================================================================= */

.footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1.5rem var(--shell-gutter);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.25rem;
  font-size: 0.88rem;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
}

/* =========================================================================
   Utility
   ========================================================================= */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* =========================================================================
   Responsive
   ========================================================================= */

@media (min-width: 1100px) {
  .browse-layout {
    grid-template-columns: minmax(14rem, 17rem) minmax(0, 1fr);
    align-items: start;
  }

  .browse-rail {
    position: sticky;
    top: 4.25rem;
  }
}

@media (min-width: 900px) {
  .timeline-item {
    grid-template-columns: minmax(6.5rem, 9rem) 2.25rem minmax(0, 1fr);
    grid-template-areas: 'opposite separator content';
    column-gap: 1.1rem;
  }

  /* An offering that sets no timing at all gets no rail to reserve space for. */
  .timeline-unanchored .timeline-item {
    grid-template-columns: 2.25rem minmax(0, 1fr);
    grid-template-areas: 'separator content';
  }

  .timeline-opposite {
    padding-top: 0.35rem;
    padding-bottom: 0;
    text-align: right;
  }
}

@media (max-width: 1023px) {
  .content-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .sidebar {
    position: static;
    max-height: none;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0 1rem;
  }

  :root[data-js='true'] .sidebar {
    display: none;
  }

  :root[data-js='true'] .sidebar[data-nav-open='true'] {
    display: block;
    padding-top: 1rem;
  }

  .sidebar-heading {
    display: none;
  }

  .main-content {
    padding-top: 1.5rem;
  }
}

@media (max-width: 1099px) {
  .browse-filters[data-filters-open='false'] {
    display: none;
  }

  .browse-filter-toggle[aria-expanded='true'] {
    border-color: var(--brand);
    background: var(--brand-tint);
    color: var(--brand-hover);
  }
}

@media (max-width: 640px) {
  .brand-copy small {
    display: none;
  }

  .source-button {
    display: none;
  }

  .nav-toggle-label {
    display: none;
  }

  .nav-toggle {
    width: 2rem;
    padding: 0;
  }

  .browse-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .card-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-summary {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

@media print {
  .topbar,
  .sidebar,
  .footer,
  .browse-controls,
  .browse-rail {
    display: none;
  }

  .content-shell {
    display: block;
    padding: 0;
  }

  .timeline-item,
  .browse-card {
    break-inside: avoid;
  }

  .prose pre {
    white-space: pre-wrap;
  }
}