/* =========================================================
   Example Domains — shared design system
   Single source of truth for palette, type scale, spacing,
   motion and the site chrome every page links verbatim.
   Mobile-first: base styles target small screens, enhanced
   inside min-width media queries.
   ========================================================= */

:root {
  /* ----- Reference custom properties (kept verbatim) ----- */
  --gray: oklch(0.6 0 0);
  --reg-col: 44%;
  --baseline: 20px;
  --nav-drop: 75px;
  --rir-arin: #4d85c5;
  --space-lg: 50px;
  --space-md: 25px;
  --space-sm: 15px;
  --space-xs: 10px;
  --color-red: oklch(0.461 0.157 29);
  --font-body: Noto, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  /* ----- Palette ----- */
  --color-background: #fafafc;
  --color-band: #f3f4f5;
  --color-surface: #f0f0f0;
  --color-panel: #ffffff;
  --color-ink: #333333;
  --color-ink-secondary: #666666;
  --color-ink-muted: #999999;
  --color-border: #cccccc;
  --color-border-light: #dddddd;
  --color-brand: #003b71;
  --color-brand-hover: #002a52;
  --color-brand-soft: #eef4fa;
  --color-nav: rgb(46 83 105);
  --color-link: #3b82c4;
  --color-link-hover: #2c6aa3;
  --color-info-bg: #eef4fa;
  --color-info-border: #b4c8dd;
  --color-notice-bg: #fff1bb;
  --color-notice-border: #f2de32;
  --color-error-bg: #fae5e3;
  --color-error-border: #c87872;
  --color-error-text: #b9554d;
  --color-highlight: #ffeb3b;
  --color-highlight-soft: #fff9c4;
  --color-live: #ff674f;
  --color-focus: #003b71;

  /* ----- Type scale ----- */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-md: 1.125rem;
  --text-lg: 1.375rem;
  --text-xl: 1.75rem;
  --text-2xl: 2.125rem;
  --leading-tight: 1.2;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold: 700;

  /* ----- Spacing ----- */
  --space-0: 0;
  --space-2xs: 5px;
  --space-xl: 80px;

  /* ----- Radius ----- */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 999px;

  /* ----- Elevation ----- */
  --shadow-panel: 0 2px 4px rgba(0, 0, 0, 0.16);
  --shadow-raised: 0 10px 30px rgba(51, 51, 51, 0.12);
  --shadow-focus: 0 0 0 3px rgba(0, 59, 113, 0.35);

  /* ----- Layout ----- */
  --container-max: 1200px;
  --content-max: 44rem;
  --nav-width: 250px;
  --gutter: var(--space-md);
  --header-height: var(--nav-drop);

  /* ----- Motion ----- */
  --duration-fast: 120ms;
  --duration-base: 200ms;
  --duration-slow: 350ms;
  --duration-reveal: 600ms;
  --ease-standard: ease;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-pop: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* =========================================================
   Reset & base
   ========================================================= */

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

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

body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  line-height: var(--leading-normal);
  min-height: 100vh;
}

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

a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 0.15em;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-link-hover);
}

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

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

hr {
  border: 0;
  border-top: 1px solid var(--color-border-light);
  margin: var(--space-lg) 0;
}

/* =========================================================
   Typography
   ========================================================= */

h1,
h2,
h3,
h4 {
  margin: 0 0 var(--space-sm);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  color: var(--color-ink);
}

h1 {
  font-size: var(--text-2xl);
  letter-spacing: -0.015em;
}

h2 {
  font-size: var(--text-xl);
}

h3 {
  font-size: var(--text-lg);
}

h4 {
  font-size: var(--text-md);
}

p {
  margin: 0 0 var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  font-size: var(--text-md);
  line-height: var(--leading-relaxed);
  color: var(--color-ink-secondary);
}

small,
.text-sm {
  font-size: var(--text-sm);
}

.text-xs {
  font-size: var(--text-xs);
}

.text-secondary {
  color: var(--color-ink-secondary);
}

.text-muted {
  color: var(--color-ink-muted);
}

.text-center {
  text-align: center;
}

strong,
b {
  font-weight: var(--weight-bold);
}

ul,
ol {
  margin: 0 0 var(--space-md);
  padding-left: 1.25rem;
}

li {
  margin-bottom: var(--space-2xs);
}

code,
.code,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.35em;
  color: var(--color-ink);
}

/* =========================================================
   Layout helpers
   ========================================================= */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose {
  max-width: var(--content-max);
}

.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-auto {
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.stack-sm {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
}

.flex-between {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

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

/* =========================================================
   Site chrome — header / nav / mobile toggle
   ========================================================= */

.site-header {
  background: var(--color-panel);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  min-height: var(--header-height);
  padding-block: var(--space-sm);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-right: auto;
  color: var(--color-brand);
  text-decoration: none;
  font-weight: var(--weight-bold);
  font-size: var(--text-md);
  letter-spacing: -0.01em;
}

.site-brand:hover {
  color: var(--color-brand-hover);
}

.site-brand-mark {
  flex: none;
  color: var(--color-brand);
}

.site-brand-text {
  line-height: var(--leading-tight);
}

/* Mobile toggle (checkbox-driven, works without JavaScript) */
.site-nav-toggle-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.site-nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: var(--space-xs);
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) var(--ease-standard);
}

.site-nav-toggle:hover {
  background: var(--color-band);
  border-color: var(--color-ink-muted);
}

.site-nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-nav);
  border-radius: var(--radius-pill);
  transition: transform var(--duration-base) var(--ease-standard),
    opacity var(--duration-fast) linear;
}

.site-nav-toggle-input:checked + .site-nav-toggle .site-nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav-toggle-input:checked + .site-nav-toggle .site-nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-nav-toggle-input:checked + .site-nav-toggle .site-nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav-toggle-input:focus-visible + .site-nav-toggle {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  box-shadow: var(--shadow-focus);
}

/* Collapsed nav on small screens */
.site-nav {
  display: none;
  width: 100%;
  order: 3;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border-light);
}

.site-nav-toggle-input:checked ~ .site-nav {
  display: block;
}

.site-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.site-nav-item {
  margin: 0;
}

.site-nav-link {
  display: block;
  padding: var(--space-sm) var(--space-sm);
  border-radius: var(--radius-md);
  color: var(--color-nav);
  font-weight: var(--weight-medium);
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease-standard),
    color var(--duration-fast) var(--ease-standard);
}

.site-nav-link:hover {
  background: var(--color-band);
  color: var(--color-brand);
}

.site-nav-link[aria-current="page"] {
  background: var(--color-brand-soft);
  color: var(--color-brand);
  box-shadow: inset 3px 0 0 var(--color-brand);
}

/* =========================================================
   Site chrome — footer
   ========================================================= */

.site-footer {
  margin-top: var(--space-xl);
  background: var(--color-band);
  border-top: 1px solid var(--color-border);
  color: var(--color-ink-secondary);
  font-size: var(--text-sm);
}

.site-footer-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
  padding-block: var(--space-lg);
}

.site-footer-heading {
  margin: 0 0 var(--space-sm);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink);
}

.site-footer-text {
  margin: 0 0 var(--space-sm);
  line-height: var(--leading-relaxed);
}

.site-footer-text:last-child {
  margin-bottom: 0;
}

.site-footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer-links li {
  margin: 0 0 var(--space-2xs);
}

.site-footer-links a {
  color: var(--color-nav);
  text-decoration: none;
}

.site-footer-links a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

.site-footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  padding-block: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.site-footer-copy {
  margin: 0;
  color: var(--color-ink);
  font-weight: var(--weight-medium);
}

.site-footer-meta {
  margin: 0;
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

/* =========================================================
   Components — buttons
   ========================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.65rem 1.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-brand);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--duration-base) var(--ease-standard),
    border-color var(--duration-base) var(--ease-standard),
    color var(--duration-base) var(--ease-standard),
    box-shadow var(--duration-base) var(--ease-standard),
    transform var(--duration-fast) var(--ease-standard);
}

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

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  box-shadow: var(--shadow-focus);
}

.btn-primary {
  background: var(--color-brand);
  border-color: var(--color-brand);
  color: var(--color-panel);
}

.btn-primary:hover {
  background: var(--color-brand-hover);
  border-color: var(--color-brand-hover);
  color: var(--color-panel);
}

.btn-secondary {
  background: var(--color-panel);
  border-color: var(--color-border);
  color: var(--color-brand);
}

.btn-secondary:hover {
  background: var(--color-band);
  border-color: var(--color-ink-muted);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: var(--text-xs);
}

.btn-lg {
  padding: 0.85rem 1.6rem;
  font-size: var(--text-md);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* =========================================================
   Components — cards, callouts, tiles
   ========================================================= */

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  background: var(--color-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-panel);
  padding: var(--space-md);
}

.card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
}

.card-title {
  margin: 0;
  font-size: var(--text-md);
  font-weight: var(--weight-bold);
}

.card-body {
  flex: 1 1 auto;
}

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

.card-footer {
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border-light);
}

.callout {
  background: var(--color-surface-faint, var(--color-background));
  border: 1px solid var(--color-border-light);
  border-left: 4px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

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

.callout-title {
  margin: 0 0 var(--space-xs);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.callout-info {
  background: var(--color-info-bg);
  border-color: var(--color-info-border);
  border-left-color: var(--color-info-border);
}

.callout-notice {
  background: var(--color-notice-bg);
  border-color: var(--color-notice-border);
  border-left-color: var(--color-notice-border);
}

.callout-error {
  background: var(--color-error-bg);
  border-color: var(--color-error-border);
  border-left-color: var(--color-error-border);
  color: var(--color-error-text);
}

.tile-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}

.tile {
  display: block;
  height: 100%;
  background: var(--color-panel);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-panel);
  padding: var(--space-md);
  color: inherit;
  text-decoration: none;
  transition: box-shadow var(--duration-base) var(--ease-standard),
    border-color var(--duration-base) var(--ease-standard),
    transform var(--duration-base) var(--ease-out);
}

.tile:hover {
  border-color: var(--color-info-border);
  box-shadow: var(--shadow-raised);
  transform: translateY(-2px);
  color: inherit;
}

.tile-title {
  margin: 0 0 var(--space-xs);
  font-size: var(--text-md);
  color: var(--color-brand);
}

.tile-text {
  margin: 0;
  color: var(--color-ink-secondary);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: 0.15rem 0.55rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-secondary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.4;
}

.badge-live {
  border-color: var(--color-live);
  color: var(--color-live);
}

/* =========================================================
   Components — code, tables, breadcrumbs
   ========================================================= */

.code-block {
  display: block;
  margin: 0 0 var(--space-md);
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: var(--color-ink);
  overflow-x: auto;
  white-space: pre;
}

.data-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.data-table caption {
  caption-side: top;
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-ink-secondary);
  font-size: var(--text-xs);
}

.data-table th,
.data-table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border-light);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: var(--color-band);
  color: var(--color-ink-secondary);
  font-weight: var(--weight-bold);
  white-space: nowrap;
}

.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table tbody tr:nth-child(even) {
  background: var(--color-background);
}

.breadcrumb {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.breadcrumb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs);
}

.breadcrumb-item {
  margin: 0;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: var(--space-2xs);
  color: var(--color-border);
}

.breadcrumb a {
  color: var(--color-nav);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* =========================================================
   Motion — reusable animation / transition classes
   ========================================================= */

@keyframes pulse {
  0% {
    color: var(--color-live);
  }
  50% {
    color: rgb(111, 42, 33);
  }
  100% {
    color: var(--color-live);
  }
}

@keyframes search-highlight-fade {
  0%,
  20% {
    background-color: rgb(255, 235, 59);
  }
  100% {
    background-color: rgb(255, 249, 196);
  }
}

@keyframes copy-check-flash {
  0% {
    opacity: 0;
    transform: scale(0.6);
  }
  20% {
    opacity: 1;
    transform: scale(1.15);
  }
  35% {
    opacity: 1;
    transform: scale(1);
  }
  75% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1);
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes marquee {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

/* State feedback */
.pulse {
  animation: pulse 1.4s ease-in-out infinite;
  color: var(--color-live);
}

.live-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: currentColor;
  animation: pulse 1.4s ease-in-out infinite;
  color: var(--color-live);
}

.search-highlight {
  background-color: var(--color-highlight-soft);
  border-radius: var(--radius-sm);
  animation: search-highlight-fade 2.4s var(--ease-standard) forwards;
}

.copy-flash {
  animation: copy-check-flash 1s var(--ease-pop) forwards;
}

/* Scroll / load reveals */
.reveal {
  opacity: 0;
  animation: reveal var(--duration-reveal) var(--ease-out) forwards;
}

.fade-up {
  opacity: 0;
  animation: fade-up var(--duration-reveal) var(--ease-out) forwards;
}

.fade-in {
  opacity: 0;
  animation: fade-in var(--duration-slow) var(--ease-standard) forwards;
}

.reveal-delay-1 {
  animation-delay: 90ms;
}

.reveal-delay-2 {
  animation-delay: 180ms;
}

.reveal-delay-3 {
  animation-delay: 270ms;
}

/* Continuous marquee strip */
.marquee {
  overflow: hidden;
  width: 100%;
}

.marquee-track {
  display: flex;
  width: max-content;
  gap: var(--space-lg);
  animation: marquee 30s linear infinite;
}

.marquee:hover .marquee-track {
  animation-play-state: paused;
}

/* Shared hover/focus transitions */
.transition {
  transition: color var(--duration-base) var(--ease-standard),
    background-color var(--duration-base) var(--ease-standard),
    border-color var(--duration-base) var(--ease-standard),
    box-shadow var(--duration-base) var(--ease-standard),
    transform var(--duration-base) var(--ease-out),
    opacity var(--duration-base) var(--ease-standard);
}

/* =========================================================
   Responsive enhancements (mobile-first)
   ========================================================= */

@media (min-width: 48rem) {
  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 1.875rem;
  }

  .site-nav-toggle,
  .site-nav-toggle-input {
    display: none;
  }

  .site-nav {
    display: block;
    width: auto;
    order: 0;
    padding-top: 0;
    border-top: 0;
  }

  .site-nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-xs);
  }

  .site-nav-link {
    padding: var(--space-xs) var(--space-sm);
    box-shadow: none;
  }

  .site-nav-link[aria-current="page"] {
    box-shadow: inset 0 -2px 0 var(--color-brand);
    background: transparent;
  }

  .site-footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg) var(--space-md);
  }

  .tile-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 64rem) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }

  .site-footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .tile-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .site-header-inner {
    flex-wrap: nowrap;
    padding-block: var(--space-xs);
  }

  .site-nav {
    width: auto;
  }
}

/* =========================================================
   Accessibility — reduced motion
   ========================================================= */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal,
  .fade-up,
  .fade-in {
    opacity: 1;
    transform: none;
  }
}