/* =========================================================================
   Scientific Research Data Management & FAIR Compliance Automation
   Light, elegant, professional theme — responsive mobile → widescreen.
   ========================================================================= */

:root {
  /* Brand palette (light, easy on the eyes) */
  --c-bg: #f6f9fb;
  --c-surface: #ffffff;
  --c-surface-2: #f1f5f9;
  --c-ink: #0f172a;
  --c-ink-soft: #334155;
  --c-muted: #64748b;
  --c-border: #e2e8f0;

  --c-primary: #0e7490;       /* cyan-700 */
  --c-primary-dark: #155e75;
  --c-primary-soft: #cffafe;  /* cyan-100 */
  --c-accent: #4f46e5;        /* indigo-600 */
  --c-accent-soft: #e0e7ff;

  --c-code-bg: #f3f7fa;
  --c-code-border: #e2e8f0;
  --c-inline-bg: #eef4f7;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow: 0 6px 20px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 14px 40px rgba(15, 23, 42, 0.12);

  --header-h: 68px;
  --container: 1240px;
  --measure: 1100px;

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", Consolas,
    "Liberation Mono", Menlo, monospace;

  --transition: 160ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(1200px 600px at 100% -10%, #ecfeff 0%, transparent 55%),
    radial-gradient(1000px 500px at -10% 0%, #eef2ff 0%, transparent 50%),
    var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

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

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--c-accent);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--c-primary);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ----------------------------- Containers -------------------------------- */
.site-header__inner,
.site-footer__inner,
.page,
.hero,
.intro,
.pillars,
.site-footer__bar {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}

/* ------------------------------- Header ---------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--c-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--c-ink);
}
.brand:hover {
  color: var(--c-ink);
}
.brand-mark {
  width: 40px;
  height: 40px;
  display: block;
  transition: transform var(--transition);
}
.brand:hover .brand-mark {
  transform: rotate(-6deg) scale(1.05);
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand__name {
  font-weight: 750;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
}
.brand__tag {
  font-size: 0.74rem;
  color: var(--c-muted);
  font-weight: 500;
}

.primary-nav__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  color: var(--c-ink-soft);
  font-weight: 600;
  font-size: 0.92rem;
  position: relative;
  transition: background var(--transition), color var(--transition);
}
.nav-link__icon {
  width: 18px;
  height: 18px;
  flex: none;
}
.nav-link:hover {
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
}
.nav-link.is-active {
  background: linear-gradient(120deg, var(--c-primary), var(--c-accent));
  color: #fff;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  background: var(--c-surface);
  cursor: pointer;
}
.nav-toggle__bar {
  width: 22px;
  height: 2px;
  background: var(--c-ink);
  margin-inline: auto;
  transition: transform var(--transition), opacity var(--transition);
}

/* ------------------------------- Hero ------------------------------------ */
.hero {
  text-align: center;
  padding: clamp(2.5rem, 6vw, 5rem) 0 1.5rem;
}
.hero__logo .brand-mark {
  width: clamp(96px, 16vw, 148px);
  height: clamp(96px, 16vw, 148px);
  margin: 0 auto;
  filter: drop-shadow(0 12px 28px rgba(14, 116, 144, 0.28));
}
.hero__title {
  font-size: clamp(2rem, 5vw, 3.3rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 1.4rem auto 0.8rem;
  max-width: 18ch;
  background: linear-gradient(120deg, var(--c-primary-dark), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__amp {
  -webkit-text-fill-color: var(--c-muted);
}
.hero__lead {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--c-ink-soft);
  max-width: 62ch;
  margin: 0 auto 2rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  justify-content: center;
}
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1.2rem;
  border-radius: 999px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-ink);
  font-weight: 650;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}
.cta-button__icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--cta-color) 15%, white);
  color: var(--cta-color);
}
.cta-button__icon svg {
  width: 20px;
  height: 20px;
}
.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--cta-color);
  color: var(--c-ink);
}

/* ------------------------------- Intro ----------------------------------- */
.intro {
  margin-top: 1.5rem;
  display: grid;
  gap: 1rem;
  max-width: var(--measure);
}
.intro p {
  font-size: 1.08rem;
  color: var(--c-ink-soft);
  margin: 0;
}

/* ------------------------------ Pillars ---------------------------------- */
.section-heading {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  margin: 3rem 0 1.4rem;
  letter-spacing: -0.01em;
}
.pillars {
  margin-bottom: 3.5rem;
}
.pillars__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.4rem;
}
.pillar-card {
  display: flex;
  flex-direction: column;
  padding: 1.6rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  color: var(--c-ink);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.pillar-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: linear-gradient(90deg, var(--cta-color), var(--c-accent));
}
.pillar-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--cta-color) 50%, var(--c-border));
  color: var(--c-ink);
}
.pillar-card__icon {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  border-radius: 14px;
  background: color-mix(in srgb, var(--cta-color) 14%, white);
  color: var(--cta-color);
  margin-bottom: 1rem;
}
.pillar-card__icon svg {
  width: 28px;
  height: 28px;
}
.pillar-card__title {
  margin: 0 0 0.4rem;
  font-size: 1.2rem;
}
.pillar-card__blurb {
  margin: 0 0 1rem;
  color: var(--c-muted);
  font-size: 0.97rem;
}
.pillar-card__children {
  list-style: none;
  margin: 0 0 1.2rem;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}
.pillar-card__children li {
  font-size: 0.9rem;
  color: var(--c-ink-soft);
  padding-left: 1.1rem;
  position: relative;
}
.pillar-card__children li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cta-color);
}
.pillar-card__go {
  margin-top: auto;
  font-weight: 700;
  color: var(--cta-color);
}

/* ----------------------------- Content page ------------------------------ */
.page--content {
  padding: 1.5rem 0 3.5rem;
}

.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.4rem;
  margin: 0 0 1.5rem;
  padding: 0;
  font-size: 0.88rem;
  color: var(--c-muted);
}
.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.breadcrumbs__sep {
  color: var(--c-border);
}
.breadcrumbs [aria-current="page"] {
  color: var(--c-ink-soft);
  font-weight: 600;
}

/* The prose column uses the full width of its container on desktop (not a
   narrow column), staying elegant on mobile. The container itself is capped
   (see --container) so text never spans the full page width. */
.prose {
  max-width: none;
  width: 100%;
}

.prose h1 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 1.2rem;
  background: linear-gradient(120deg, var(--c-primary-dark), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.prose h2 {
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  margin: 2.6rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--c-surface-2);
  letter-spacing: -0.01em;
}
.prose h3 {
  font-size: 1.3rem;
  margin: 2rem 0 0.7rem;
  color: var(--c-primary-dark);
}
.prose h4 {
  font-size: 1.1rem;
  margin: 1.6rem 0 0.6rem;
}
.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  scroll-margin-top: calc(var(--header-h) + 16px);
}
.prose p,
.prose li {
  color: var(--c-ink-soft);
}
.prose p {
  margin: 0 0 1.1rem;
}
.prose ul,
.prose ol {
  margin: 0 0 1.2rem;
  padding-left: 1.4rem;
}
.prose li {
  margin: 0.35rem 0;
}
.prose strong {
  color: var(--c-ink);
}
.prose a {
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--c-primary) 35%, transparent);
  text-underline-offset: 3px;
  transition: color var(--transition), text-decoration-color var(--transition);
}
.prose a:hover {
  text-decoration-color: var(--c-accent);
}
.prose blockquote {
  margin: 1.4rem 0;
  padding: 0.6rem 1.2rem;
  border-left: 4px solid var(--c-primary);
  background: var(--c-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-ink-soft);
}

/* Heading anchor link */
.heading-anchor {
  color: var(--c-border);
  margin-left: 0.4rem;
  font-weight: 400;
  text-decoration: none;
  opacity: 0;
  transition: opacity var(--transition), color var(--transition);
}
.prose h2:hover .heading-anchor,
.prose h3:hover .heading-anchor,
.prose h4:hover .heading-anchor {
  opacity: 1;
}
.heading-anchor:hover {
  color: var(--c-accent);
}

/* ------------------------------- Inline code ----------------------------- */
.prose :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--c-inline-bg);
  color: var(--c-primary-dark);
  padding: 0.12em 0.4em;
  border-radius: 5px;
  border: 0;
}

/* ------------------------------- Code blocks ----------------------------- */
.code-block {
  margin: 1.5rem 0;
  border: 1px solid var(--c-code-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--c-code-bg);
  box-shadow: var(--shadow-sm);
}
.code-block__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.5rem 0.4rem 0.9rem;
  background: var(--c-surface-2);
  border-bottom: 1px solid var(--c-code-border);
}
.code-block__lang {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}
.code-block__copy {
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-ink-soft);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition);
}
.code-block__copy:hover {
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  border-color: var(--c-primary);
}
.code-block__copy.is-copied {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
}
.code-block pre {
  margin: 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.6;
  background: var(--c-code-bg);
  color: #1e293b;
}

/* Prism light token theme matching the site palette */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #8a99a8;
  font-style: italic;
}
.token.punctuation {
  color: #5b6b7b;
}
.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
  color: #b45309;
}
.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #047857;
}
.token.operator,
.token.entity,
.token.url {
  color: #0e7490;
}
.token.atrule,
.token.attr-value,
.token.keyword {
  color: #4f46e5;
  font-weight: 600;
}
.token.function,
.token.class-name {
  color: #0369a1;
}
.token.regex,
.token.important,
.token.variable {
  color: #c026d3;
}

/* -------------------------------- Tables --------------------------------- */
.table-wrap {
  overflow-x: auto;
  margin: 1.6rem 0;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  -webkit-overflow-scrolling: touch;
}
.prose table {
  border-collapse: collapse;
  width: 100%;
  min-width: 520px;
  font-size: 0.92rem;
}
.prose thead {
  background: linear-gradient(120deg, var(--c-primary), var(--c-accent));
}
.prose th {
  color: #fff;
  text-align: left;
  font-weight: 650;
  padding: 0.7rem 0.9rem;
  white-space: nowrap;
}
.prose td {
  padding: 0.65rem 0.9rem;
  border-top: 1px solid var(--c-border);
  color: var(--c-ink-soft);
  vertical-align: top;
}
.prose tbody tr:nth-child(even) {
  background: var(--c-surface-2);
}
.prose tbody tr:hover {
  background: var(--c-primary-soft);
}

/* --------------------------- Task-list checkboxes ------------------------ */
.prose ul.contains-task-list,
.prose .contains-task-list {
  list-style: none;
  padding-left: 0.2rem;
}
.prose li.task-list-item {
  position: relative;
  padding-left: 0.3rem;
  list-style: none;
}
.prose li.task-list-item::marker {
  content: "";
}
.prose .task-list-item-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 1.15em;
  height: 1.15em;
  margin-right: 0.55em;
  vertical-align: -0.2em;
  border: 2px solid var(--c-primary);
  border-radius: 5px;
  background: var(--c-surface);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  position: relative;
  flex: none;
}
.prose .task-list-item-checkbox:hover {
  border-color: var(--c-accent);
}
.prose .task-list-item-checkbox:checked {
  background: var(--c-primary);
  border-color: var(--c-primary);
}
.prose .task-list-item-checkbox:checked::after {
  content: "";
  position: absolute;
  left: 0.28em;
  top: 0.04em;
  width: 0.3em;
  height: 0.6em;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.prose .task-list-item-checkbox:checked + * ,
.prose li.task-list-item:has(.task-list-item-checkbox:checked) {
  text-decoration: line-through;
  color: var(--c-muted);
}

/* ------------------------------ FAQ accordions --------------------------- */
.faq-item {
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  margin: 0.8rem 0;
  background: var(--c-surface);
  overflow: hidden;
}
.faq-item__q {
  cursor: pointer;
  padding: 1rem 1.2rem;
  font-weight: 650;
  color: var(--c-ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}
.faq-item__q::-webkit-details-marker {
  display: none;
}
.faq-item__q::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--c-primary);
  transition: transform var(--transition);
}
.faq-item[open] .faq-item__q::after {
  transform: rotate(45deg);
}
.faq-item > *:not(summary) {
  padding: 0 1.2rem;
}
.faq-item > *:last-child {
  padding-bottom: 1rem;
}

/* --------------------------- Diagrams (Mermaid) -------------------------- */
.diagram {
  margin: 1.8rem 0;
  padding: 0;
}
.diagram__frame {
  position: relative;
  background:
    radial-gradient(120% 120% at 0% 0%, #f0fbff 0%, transparent 60%),
    var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 1.4rem 1.2rem;
  text-align: center;
  transition: box-shadow var(--transition), border-color var(--transition);
}
.diagram.is-zoomable .diagram__frame {
  cursor: zoom-in;
}
.diagram.is-zoomable:hover .diagram__frame {
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--c-primary) 45%, var(--c-border));
}
.diagram .mermaid {
  margin: 0;
  display: flex;
  justify-content: center;
}
.diagram .mermaid svg {
  max-width: 100%;
  height: auto;
}
/* Hide the raw source until Mermaid has rendered, to avoid a flash of text. */
.diagram .mermaid:not([data-processed="true"]) {
  visibility: hidden;
  min-height: 80px;
}
.diagram__expand {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--c-border);
  background: rgba(255, 255, 255, 0.9);
  color: var(--c-primary-dark);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition), background var(--transition),
    color var(--transition), transform var(--transition);
}
.diagram__frame:hover .diagram__expand,
.diagram__expand:focus-visible {
  opacity: 1;
}
.diagram__expand:hover {
  background: var(--c-primary);
  color: #fff;
  transform: scale(1.05);
}
.diagram__expand svg {
  width: 19px;
  height: 19px;
}
.diagram figcaption {
  margin-top: 0.7rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--c-muted);
  font-style: italic;
}
@media (hover: none) {
  /* Touch devices: keep the expand control visible. */
  .diagram__expand {
    opacity: 1;
  }
}

/* Full-screen diagram modal */
body.modal-open {
  overflow: hidden;
}
.diagram-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: clamp(0.5rem, 3vw, 2.5rem);
}
.diagram-modal[hidden] {
  display: none;
}
.diagram-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 24, 34, 0.72);
  backdrop-filter: blur(3px);
  animation: diagram-fade 160ms ease;
}
.diagram-modal__content {
  position: relative;
  width: min(96vw, 1500px);
  max-height: 92vh;
  background: var(--c-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: clamp(1rem, 3vw, 2.2rem);
  display: flex;
  animation: diagram-pop 180ms ease;
}
.diagram-modal__stage {
  width: 100%;
  display: grid;
  place-items: center;
  overflow: auto;
}
.diagram-modal__stage svg {
  width: 100%;
  height: auto;
}
.diagram-modal__close {
  position: absolute;
  top: 0.6rem;
  right: 0.7rem;
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 50%;
  background: var(--c-surface-2);
  color: var(--c-ink);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
}
.diagram-modal__close:hover {
  background: var(--c-primary);
  color: #fff;
  transform: rotate(90deg);
}
@keyframes diagram-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes diagram-pop {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ------------------------------ Related grid ----------------------------- */
.related {
  margin-top: 3rem;
}
.related__title {
  font-size: 1.4rem;
  margin: 0 0 1.2rem;
}
.related__grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.1rem;
}
.related__card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  height: 100%;
  padding: 1.2rem 1.3rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  color: var(--c-ink);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}
.related__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--c-primary);
  color: var(--c-ink);
}
.related__card-title {
  font-weight: 700;
  font-size: 1.05rem;
}
.related__card-desc {
  color: var(--c-muted);
  font-size: 0.9rem;
  flex: 1;
}
.related__card-go {
  font-weight: 700;
  color: var(--c-primary);
}

.parent-link {
  margin-top: 2.2rem;
}
.parent-link a {
  font-weight: 600;
}

/* ------------------------------- Footer ---------------------------------- */
.site-footer {
  flex-shrink: 0;
  margin-top: auto;
  background: #0c2230;
  color: #cbd5e1;
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: space-between;
  padding: 2.5rem 0 1.5rem;
}
.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  max-width: 360px;
}
.site-footer__brand .brand-mark {
  width: 46px;
  height: 46px;
}
.site-footer__name {
  margin: 0;
  font-weight: 700;
  color: #fff;
}
.site-footer__desc {
  margin: 0.2rem 0 0;
  font-size: 0.9rem;
  color: #94a3b8;
}
.site-footer__heading {
  margin: 0 0 0.7rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #7dd3fc;
}
.site-footer__nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}
.site-footer__nav a {
  color: #cbd5e1;
}
.site-footer__nav a:hover {
  color: #fff;
}
.site-footer__bar {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1rem 0;
}
.site-footer__bar p {
  margin: 0;
  font-size: 0.82rem;
  color: #7e93a8;
}

/* ------------------------------ 404 page --------------------------------- */
.error-page {
  width: min(100% - 2.5rem, 760px);
  margin: clamp(3rem, 8vw, 6rem) auto;
  text-align: center;
}
.error-page__code {
  font-size: clamp(4rem, 16vw, 8rem);
  font-weight: 800;
  line-height: 1;
  margin: 0;
  letter-spacing: -0.03em;
  background: linear-gradient(120deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.error-page__title {
  font-size: clamp(1.4rem, 4vw, 2.1rem);
  margin: 0.4rem 0 0.8rem;
}
.error-page__lead {
  color: var(--c-ink-soft);
  font-size: 1.08rem;
  max-width: 52ch;
  margin: 0 auto 2rem;
}
.error-page__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: center;
}

/* ----------------------------- Responsive -------------------------------- */
@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }
  .primary-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }
  .primary-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    padding: 0.8rem;
  }
  .nav-link {
    padding: 0.8rem 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}

@media print {
  .site-header,
  .site-footer,
  .nav-toggle,
  .code-block__copy,
  .related,
  .parent-link {
    display: none !important;
  }
  body {
    background: #fff;
  }
}