:root {
  --fs-bg: #04060e;
  --fs-bg-2: #070b16;
  --fs-surface: #0b1120;
  --fs-surface-2: #111a2e;
  --fs-border: rgba(120, 170, 255, 0.14);
  --fs-text: #e9f0ff;
  --fs-muted: #9fb0d0;
  --fs-cyan: #38f2ff;
  --fs-cyan-dim: #0fb6c9;
  --fs-violet: #8b5cf6;
  --fs-focus: #7df9ff;
  --fs-success: #55e6a5;
  --fs-warn-text: #c4b5fd;
  --fs-font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --fs-font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --fs-space-1: 0.25rem;
  --fs-space-2: 0.5rem;
  --fs-space-3: 0.75rem;
  --fs-space-4: 1rem;
  --fs-space-5: 1.5rem;
  --fs-space-6: 2rem;
  --fs-space-7: 3rem;
  --fs-space-8: 4rem;
  --fs-radius: 14px;
  --fs-radius-sm: 10px;
  --fs-radius-pill: 999px;
  --fs-shadow: 0 20px 60px -30px rgba(0, 0, 0, 0.9);
  --fs-glow-cyan: 0 0 0 1px rgba(56, 242, 255, 0.25), 0 0 40px -12px rgba(56, 242, 255, 0.55);
  --fs-glow-violet: 0 0 40px -12px rgba(139, 92, 246, 0.6);
  --fs-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --fs-dur: 220ms;
  --fs-measure: 68ch;
  --fs-header-h: 64px;
}

@media (prefers-color-scheme: light) {
  :root {
    --fs-bg: #f5f8ff;
    --fs-bg-2: #eaf0fb;
    --fs-surface: #ffffff;
    --fs-surface-2: #f0f5fd;
    --fs-border: rgba(20, 50, 110, 0.16);
    --fs-text: #0a1224;
    --fs-muted: #43506b;
    --fs-cyan: #067a8a;
    --fs-cyan-dim: #0a8ea0;
    --fs-violet: #6d3fd8;
    --fs-focus: #0b6fd0;
    --fs-success: #0f8f5f;
    --fs-warn-text: #5b21b6;
    --fs-shadow: 0 20px 50px -34px rgba(12, 30, 70, 0.45);
    --fs-glow-cyan: 0 0 0 1px rgba(6, 122, 138, 0.35), 0 0 34px -16px rgba(6, 122, 138, 0.5);
    --fs-glow-violet: 0 0 34px -16px rgba(109, 63, 216, 0.5);
  }
}

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

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

body {
  margin: 0;
  background-color: var(--fs-bg);
  background-image:
    radial-gradient(80% 60% at 50% -10%, rgba(56, 242, 255, 0.08), transparent 60%),
    radial-gradient(70% 50% at 100% 0%, rgba(139, 92, 246, 0.08), transparent 55%);
  background-repeat: no-repeat;
  color: var(--fs-text);
  font-family: var(--fs-font-sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--fs-space-3);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--fs-text);
  text-wrap: balance;
}

p { margin: 0 0 var(--fs-space-4); }

a { color: var(--fs-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

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

ul, ol { margin: 0 0 var(--fs-space-4); padding-left: 1.25rem; }

hr { border: 0; border-top: 1px solid var(--fs-border); margin: var(--fs-space-6) 0; }

button { font: inherit; color: inherit; }

:focus-visible {
  outline: 3px solid var(--fs-focus);
  outline-offset: 2px;
  border-radius: 5px;
}

::selection {
  background: rgba(56, 242, 255, 0.3);
  color: var(--fs-text);
}

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

.skip-link {
  position: absolute;
  top: var(--fs-space-2);
  left: var(--fs-space-3);
  z-index: 200;
  transform: translateY(-140%);
  padding: var(--fs-space-2) var(--fs-space-4);
  background: var(--fs-surface-2);
  color: var(--fs-text);
  border: 1px solid var(--fs-cyan);
  border-radius: var(--fs-radius-pill);
  font-weight: 700;
  box-shadow: var(--fs-glow-cyan);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: none;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.section { padding-block: clamp(2.75rem, 7vw, 5.5rem); }
.section--tight { padding-block: clamp(1.75rem, 4vw, 3rem); }

.section__head {
  max-width: 62ch;
  margin-bottom: var(--fs-space-6);
}

.section__title {
  font-size: clamp(1.55rem, 1.2rem + 1.6vw, 2.35rem);
}

.section__lede {
  color: var(--fs-muted);
  font-size: clamp(1.02rem, 0.98rem + 0.4vw, 1.2rem);
  margin: 0;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--fs-space-5);
}

.divider {
  height: 1px;
  border: 0;
  margin-block: var(--fs-space-7);
  background: linear-gradient(90deg, transparent, var(--fs-border) 18%, var(--fs-border) 82%, transparent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--fs-bg) 72%, transparent);
  border-bottom: 1px solid transparent;
}

.site-header .container,
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--fs-space-4);
  min-height: var(--fs-header-h);
}

.site-header--scrolled {
  background: color-mix(in srgb, var(--fs-bg) 86%, transparent);
  border-bottom-color: var(--fs-border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--fs-space-3);
  color: var(--fs-text);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }

.brand__mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: 10px;
  background: linear-gradient(140deg, var(--fs-cyan), var(--fs-violet));
  color: #04060e;
  font-family: var(--fs-font-mono);
  font-weight: 800;
  font-size: 0.95rem;
  box-shadow: var(--fs-glow-cyan);
}

.brand__name {
  font-size: 1.12rem;
  line-height: 1.1;
}

.site-nav { display: block; }

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--fs-space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  display: inline-block;
  padding: var(--fs-space-2) var(--fs-space-3);
  border-radius: var(--fs-radius-pill);
  color: var(--fs-muted);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
}
.nav-link:hover { color: var(--fs-text); text-decoration: none; }

.nav-link[aria-current="page"] {
  color: var(--fs-text);
  background: color-mix(in srgb, var(--fs-cyan) 14%, transparent);
  border-color: color-mix(in srgb, var(--fs-cyan) 45%, transparent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: var(--fs-surface);
  border: 1px solid var(--fs-border);
  border-radius: var(--fs-radius-sm);
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--fs-text);
}

@media (max-width: 899px) {
  .js .nav-toggle { display: flex; }

  .js .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    padding: var(--fs-space-4) clamp(1rem, 4vw, 2rem) var(--fs-space-5);
    background: var(--fs-surface);
    border-bottom: 1px solid var(--fs-border);
    box-shadow: var(--fs-shadow);
    display: none;
  }

  .js .site-header.nav-open .site-nav,
  .js body.nav-open .site-nav {
    display: block;
  }

  .js body.nav-open { overflow: hidden; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--fs-space-1);
  }

  .nav-link {
    padding: var(--fs-space-3) var(--fs-space-4);
    border-radius: var(--fs-radius-sm);
    font-size: 1.02rem;
  }
}

.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(3rem, 9vw, 6.5rem);
  border-bottom: 1px solid var(--fs-border);
}

.hero__aurora {
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 150%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.85;
  background:
    radial-gradient(55% 50% at 18% 12%, rgba(56, 242, 255, 0.30), transparent 62%),
    radial-gradient(48% 46% at 82% 8%, rgba(139, 92, 246, 0.28), transparent 60%),
    radial-gradient(70% 60% at 50% 92%, rgba(15, 182, 201, 0.18), transparent 66%);
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 60ch;
}

.hero__eyebrow {
  display: inline-block;
  margin-bottom: var(--fs-space-4);
  padding: var(--fs-space-1) var(--fs-space-3);
  border: 1px solid color-mix(in srgb, var(--fs-cyan) 45%, transparent);
  border-radius: var(--fs-radius-pill);
  color: var(--fs-cyan);
  background: color-mix(in srgb, var(--fs-cyan) 10%, transparent);
  font-family: var(--fs-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero__title {
  font-size: clamp(2.1rem, 1.4rem + 4.2vw, 4rem);
  font-weight: 800;
  margin-bottom: var(--fs-space-4);
}

.hero__lede {
  font-size: clamp(1.05rem, 1rem + 0.6vw, 1.32rem);
  color: var(--fs-muted);
  max-width: var(--fs-measure);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--fs-space-3);
  margin-top: var(--fs-space-5);
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--fs-space-4);
  margin-top: var(--fs-space-7);
  padding-top: var(--fs-space-5);
  border-top: 1px solid var(--fs-border);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: var(--fs-space-1);
}

.stat__num {
  font-size: clamp(1.4rem, 1.1rem + 1.4vw, 2rem);
  font-weight: 800;
  color: var(--fs-cyan);
  font-family: var(--fs-font-mono);
  letter-spacing: -0.02em;
}

.stat__label {
  color: var(--fs-muted);
  font-size: 0.9rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--fs-space-2);
  padding: var(--fs-space-3) var(--fs-space-5);
  border-radius: var(--fs-radius-pill);
  border: 1px solid var(--fs-border);
  background: var(--fs-surface);
  color: var(--fs-text);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}
.btn:hover { text-decoration: none; }

.btn--primary {
  background: linear-gradient(135deg, var(--fs-cyan), var(--fs-cyan-dim));
  color: #04060e;
  border-color: transparent;
  box-shadow: var(--fs-glow-cyan);
}

.btn--ghost {
  background: transparent;
  border-color: color-mix(in srgb, var(--fs-violet) 60%, transparent);
  color: var(--fs-text);
}

.btn--sm {
  padding: var(--fs-space-2) var(--fs-space-4);
  font-size: 0.9rem;
}

.text-link {
  color: var(--fs-cyan);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--fs-cyan) 45%, transparent);
}
.text-link:hover { text-decoration: none; border-bottom-color: var(--fs-cyan); }

.ref-link {
  font-family: var(--fs-font-mono);
  font-size: 0.92em;
  color: var(--fs-cyan);
  word-break: break-all;
  overflow-wrap: anywhere;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--fs-cyan) 55%, transparent);
  text-underline-offset: 3px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: var(--fs-space-3);
  padding: var(--fs-space-5);
  background: var(--fs-surface);
  border: 1px solid var(--fs-border);
  border-radius: var(--fs-radius);
  box-shadow: var(--fs-shadow);
}

.card__tag {
  align-self: flex-start;
  padding: var(--fs-space-1) var(--fs-space-3);
  border-radius: var(--fs-radius-pill);
  background: color-mix(in srgb, var(--fs-violet) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--fs-violet) 45%, transparent);
  color: color-mix(in srgb, var(--fs-text) 88%, var(--fs-violet));
  font-family: var(--fs-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.card__title {
  font-size: clamp(1.15rem, 1.05rem + 0.7vw, 1.5rem);
  margin: 0;
}

.card__title a { color: var(--fs-text); }
.card__title a:hover { color: var(--fs-cyan); text-decoration: none; }

.card__excerpt {
  color: var(--fs-muted);
  margin: 0;
  font-size: 0.98rem;
}

.card__meta {
  margin-top: auto;
  color: var(--fs-muted);
  font-size: 0.82rem;
  font-family: var(--fs-font-mono);
  display: flex;
  flex-wrap: wrap;
  gap: var(--fs-space-2);
}

.card__cta {
  color: var(--fs-cyan);
  font-weight: 700;
  font-size: 0.92rem;
}

.card--feature {
  padding: clamp(1.5rem, 1rem + 2vw, 2.75rem);
  background:
    radial-gradient(120% 140% at 0% 0%, color-mix(in srgb, var(--fs-cyan) 12%, transparent), transparent 55%),
    var(--fs-surface-2);
  border-color: color-mix(in srgb, var(--fs-cyan) 30%, var(--fs-border));
}

.card--feature .card__title {
  font-size: clamp(1.5rem, 1.2rem + 1.6vw, 2.2rem);
}

.breadcrumbs {
  font-size: 0.86rem;
  color: var(--fs-muted);
  margin-bottom: var(--fs-space-4);
}

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

.breadcrumbs li { display: inline-flex; align-items: center; gap: var(--fs-space-2); }
.breadcrumbs li + li::before { content: "/"; color: var(--fs-border); }
.breadcrumbs a { color: var(--fs-muted); display: inline-block; padding-block: 3px; }
.breadcrumbs a:hover { color: var(--fs-cyan); }

.article { padding-block: clamp(2rem, 5vw, 4rem); }

.article__header {
  max-width: 72ch;
  margin-bottom: var(--fs-space-6);
}

.article__eyebrow {
  display: inline-block;
  margin-bottom: var(--fs-space-3);
  color: var(--fs-cyan);
  font-family: var(--fs-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article__title {
  font-size: clamp(1.9rem, 1.35rem + 3.2vw, 3.25rem);
  margin-bottom: var(--fs-space-4);
}

.article__lede {
  font-size: clamp(1.08rem, 1rem + 0.6vw, 1.3rem);
  color: var(--fs-muted);
  margin: 0;
}

.article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--fs-space-2) var(--fs-space-4);
  margin-top: var(--fs-space-4);
  color: var(--fs-muted);
  font-size: 0.85rem;
  font-family: var(--fs-font-mono);
}

.article__body { margin-top: var(--fs-space-6); }

.article__toc,
.toc {
  padding: var(--fs-space-4) var(--fs-space-5);
  margin-bottom: var(--fs-space-6);
  background: var(--fs-surface);
  border: 1px solid var(--fs-border);
  border-left: 3px solid var(--fs-cyan);
  border-radius: var(--fs-radius-sm);
}

.toc ol, .toc ul { margin: 0; padding-left: 1.1rem; }
.toc li { margin-block: var(--fs-space-1); }
.toc a { color: var(--fs-muted); display: inline-block; padding-block: 3px; }
.toc a:hover { color: var(--fs-cyan); }

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

.prose > * + * { margin-top: var(--fs-space-4); }

.prose h2 {
  font-size: clamp(1.45rem, 1.2rem + 1.1vw, 2rem);
  margin-top: var(--fs-space-7);
  scroll-margin-top: calc(var(--fs-header-h) + 1rem);
}

.prose h3 {
  font-size: clamp(1.2rem, 1.05rem + 0.7vw, 1.5rem);
  margin-top: var(--fs-space-6);
  scroll-margin-top: calc(var(--fs-header-h) + 1rem);
}

.prose h4 {
  font-size: 1.1rem;
  margin-top: var(--fs-space-5);
  scroll-margin-top: calc(var(--fs-header-h) + 1rem);
}

.prose p { margin: 0; }

.prose ul, .prose ol { padding-left: 1.35rem; }
.prose li + li { margin-top: var(--fs-space-2); }

.prose a {
  color: var(--fs-cyan);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--fs-cyan) 50%, transparent);
  text-underline-offset: 3px;
}
.prose a:hover { text-decoration-color: var(--fs-cyan); }

.callout a:not(.btn):not(.ref-link),
.disclosure a:not(.btn):not(.ref-link) {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--fs-cyan) 50%, transparent);
  text-underline-offset: 3px;
}
.callout a:not(.btn):not(.ref-link):hover,
.disclosure a:not(.btn):not(.ref-link):hover { text-decoration-color: var(--fs-cyan); }

.prose strong { color: var(--fs-text); font-weight: 700; }

.prose blockquote {
  margin: var(--fs-space-5) 0;
  padding: var(--fs-space-3) var(--fs-space-5);
  border-left: 3px solid var(--fs-violet);
  background: color-mix(in srgb, var(--fs-violet) 8%, transparent);
  border-radius: 0 var(--fs-radius-sm) var(--fs-radius-sm) 0;
  color: color-mix(in srgb, var(--fs-text) 92%, var(--fs-muted));
  font-style: italic;
}
.prose blockquote p:last-child { margin-bottom: 0; }

.prose code {
  font-family: var(--fs-font-mono);
  font-size: 0.9em;
  padding: 0.12em 0.4em;
  background: var(--fs-surface-2);
  border: 1px solid var(--fs-border);
  border-radius: 6px;
}

.prose pre {
  overflow-x: auto;
  padding: var(--fs-space-4);
  background: var(--fs-bg-2);
  border: 1px solid var(--fs-border);
  border-radius: var(--fs-radius-sm);
}
.prose pre code { padding: 0; border: 0; background: none; }

.prose hr {
  border: 0;
  border-top: 1px solid var(--fs-border);
  margin: var(--fs-space-7) 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}

.prose th, .prose td {
  padding: var(--fs-space-3) var(--fs-space-4);
  border: 1px solid var(--fs-border);
  text-align: left;
  vertical-align: top;
}

.prose thead th {
  background: var(--fs-surface-2);
  color: var(--fs-text);
  font-weight: 700;
}

.prose tbody tr:nth-child(even) { background: color-mix(in srgb, var(--fs-surface) 60%, transparent); }

.table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-block: var(--fs-space-5);
  border: 1px solid var(--fs-border);
  border-radius: var(--fs-radius-sm);
}
.table-wrap table { margin: 0; min-width: 520px; }

.callout {
  margin-block: var(--fs-space-5);
  padding: var(--fs-space-4) var(--fs-space-5);
  border: 1px solid var(--fs-border);
  border-left: 3px solid var(--fs-cyan);
  border-radius: var(--fs-radius-sm);
  background: var(--fs-surface);
}

.callout--note {
  border-left-color: var(--fs-cyan);
  background: color-mix(in srgb, var(--fs-cyan) 7%, var(--fs-surface));
}

.callout--warn {
  border-left-color: var(--fs-violet);
  background: color-mix(in srgb, var(--fs-violet) 9%, var(--fs-surface));
}

.callout__title {
  margin: 0 0 var(--fs-space-2);
  font-size: 0.85rem;
  font-family: var(--fs-font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fs-cyan);
}
.callout--warn .callout__title { color: var(--fs-warn-text); }
.callout p:last-child { margin-bottom: 0; }

.disclosure {
  margin-block: var(--fs-space-5);
  padding: var(--fs-space-4) var(--fs-space-5);
  border: 1px dashed color-mix(in srgb, var(--fs-cyan) 40%, var(--fs-border));
  border-radius: var(--fs-radius);
  background: color-mix(in srgb, var(--fs-cyan) 5%, var(--fs-bg-2));
  color: var(--fs-muted);
  font-size: 0.92rem;
}
.disclosure p:last-child { margin-bottom: 0; }

.source-list,
.ref-list {
  margin: var(--fs-space-5) 0;
  padding-left: 1.4rem;
}
.source-list li,
.ref-list li { margin-bottom: var(--fs-space-3); }
.source-list a,
.ref-list a {
  font-family: var(--fs-font-mono);
  font-size: 0.88em;
  color: var(--fs-cyan);
  word-break: break-all;
  overflow-wrap: anywhere;
}

.key-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-block: var(--fs-space-5);
  padding: var(--fs-space-2) var(--fs-space-5);
  background: var(--fs-surface);
  border: 1px solid var(--fs-border);
  border-radius: var(--fs-radius);
  box-shadow: var(--fs-shadow);
}

.key-facts dt {
  padding-top: var(--fs-space-3);
  color: var(--fs-cyan);
  font-family: var(--fs-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.key-facts dd {
  margin: 0;
  padding: var(--fs-space-2) 0 var(--fs-space-3);
  border-bottom: 1px solid var(--fs-border);
}
.key-facts dd:last-child { border-bottom: 0; }

@media (min-width: 640px) {
  .key-facts { grid-template-columns: minmax(160px, 220px) 1fr; }
  .key-facts dt { padding-block: var(--fs-space-3); }
  .key-facts dd { padding-block: var(--fs-space-3); border-bottom: 1px solid var(--fs-border); }
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--fs-space-2);
  margin-block: var(--fs-space-5);
  padding: 0;
  list-style: none;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--fs-space-1);
  padding: var(--fs-space-1) var(--fs-space-4);
  border-radius: var(--fs-radius-pill);
  background: var(--fs-surface-2);
  border: 1px solid var(--fs-border);
  color: var(--fs-muted);
  font-size: 0.85rem;
  font-weight: 600;
}

.share {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--fs-space-3);
  margin-block: var(--fs-space-6);
  padding-top: var(--fs-space-5);
  border-top: 1px solid var(--fs-border);
  color: var(--fs-muted);
  font-size: 0.9rem;
}

.article-nav {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--fs-space-4);
  margin-top: var(--fs-space-7);
  padding-top: var(--fs-space-6);
  border-top: 1px solid var(--fs-border);
}

.article-nav a {
  display: block;
  padding: var(--fs-space-4) var(--fs-space-5);
  background: var(--fs-surface);
  border: 1px solid var(--fs-border);
  border-radius: var(--fs-radius);
  color: var(--fs-text);
  font-weight: 700;
}
.article-nav a:hover { border-color: color-mix(in srgb, var(--fs-cyan) 50%, var(--fs-border)); text-decoration: none; }
.article-nav a span { display: block; color: var(--fs-muted); font-size: 0.8rem; font-family: var(--fs-font-mono); text-transform: uppercase; letter-spacing: 0.06em; }

.search {
  display: flex;
  flex-direction: column;
  gap: var(--fs-space-2);
}

.search__field {
  display: flex;
  align-items: center;
  gap: var(--fs-space-2);
  padding: var(--fs-space-2) var(--fs-space-4);
  background: var(--fs-surface);
  border: 1px solid var(--fs-border);
  border-radius: var(--fs-radius-pill);
}

.search__field:focus-within {
  border-color: var(--fs-cyan);
  box-shadow: var(--fs-glow-cyan);
}

.search__input {
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  padding: var(--fs-space-2) 0;
  background: transparent;
  border: 0;
  color: var(--fs-text);
  font: inherit;
}
.search__input:focus { outline: none; }
.search__input::placeholder { color: var(--fs-muted); }

.search__results {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--fs-space-1);
}
.search__results:empty { display: none; }

.search__item {
  display: block;
  padding: var(--fs-space-3) var(--fs-space-4);
  border: 1px solid transparent;
  border-radius: var(--fs-radius-sm);
  background: var(--fs-surface);
  color: var(--fs-text);
  text-decoration: none;
}
.search__item:hover { text-decoration: none; }

.search__item--active {
  border-color: color-mix(in srgb, var(--fs-cyan) 55%, transparent);
  background: color-mix(in srgb, var(--fs-cyan) 10%, var(--fs-surface));
}

.search__item-title { display: block; font-weight: 700; }
.search__item-meta { display: block; margin-top: 2px; color: var(--fs-muted); font-size: 0.76rem; font-family: var(--fs-font-mono); text-transform: uppercase; letter-spacing: 0.05em; }
.search__item-excerpt { display: block; margin-top: var(--fs-space-1); color: var(--fs-muted); font-size: 0.9rem; }

.search__empty {
  margin: var(--fs-space-2) 0 0;
  padding: var(--fs-space-3) var(--fs-space-4);
  color: var(--fs-muted);
  background: var(--fs-surface);
  border: 1px dashed var(--fs-border);
  border-radius: var(--fs-radius-sm);
  font-size: 0.92rem;
}

.search__hint {
  margin: 0;
  color: var(--fs-muted);
  font-size: 0.82rem;
}

.site-footer {
  margin-top: var(--fs-space-8);
  padding-block: var(--fs-space-7) var(--fs-space-5);
  background: var(--fs-bg-2);
  border-top: 1px solid var(--fs-border);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--fs-space-6);
}

.footer__col { min-width: 0; }

.footer__heading {
  font-size: 0.8rem;
  font-family: var(--fs-font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fs-cyan);
  margin-bottom: var(--fs-space-3);
}

.footer__link {
  display: inline-block;
  color: var(--fs-muted);
  padding-block: var(--fs-space-1);
  text-decoration: none;
}
.footer__link:hover { color: var(--fs-text); text-decoration: none; }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--fs-space-3);
  margin-top: var(--fs-space-6);
  padding-top: var(--fs-space-5);
  border-top: 1px solid var(--fs-border);
  color: var(--fs-muted);
  font-size: 0.85rem;
}

.footer__legal { max-width: 62ch; }

.back-to-top {
  position: fixed;
  right: var(--fs-space-4);
  bottom: var(--fs-space-4);
  z-index: 90;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  padding: 0;
  background: var(--fs-surface-2);
  border: 1px solid color-mix(in srgb, var(--fs-cyan) 45%, var(--fs-border));
  border-radius: var(--fs-radius-pill);
  color: var(--fs-cyan);
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  box-shadow: var(--fs-glow-cyan);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }

  .site-header,
  .skip-link,
  .nav-link,
  .btn,
  .text-link,
  .card,
  .card__title a,
  .search__field,
  .search__item,
  .article-nav a,
  .footer__link,
  .back-to-top,
  .pill {
    transition-property: color, background-color, border-color, box-shadow, opacity, transform;
    transition-duration: var(--fs-dur);
    transition-timing-function: var(--fs-ease);
  }

  .site-header { transition-property: background-color, border-color; }

  .card { will-change: transform; }

  .js .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 600ms var(--fs-ease), transform 600ms var(--fs-ease);
  }

  .js .reveal.is-visible {
    opacity: 1;
    transform: none;
  }

  .hero__aurora {
    animation: fs-aurora 24s var(--fs-ease) infinite alternate;
  }

  @keyframes fs-aurora {
    0% { transform: translate3d(-2%, -1%, 0) scale(1); }
    50% { transform: translate3d(2%, 1%, 0) scale(1.06); }
    100% { transform: translate3d(-1%, 2%, 0) scale(1.02); }
  }

  .nav-toggle__bar {
    transition: transform var(--fs-dur) var(--fs-ease), opacity var(--fs-dur) var(--fs-ease);
  }

  .site-header.nav-open .nav-toggle__bar:nth-child(1),
  body.nav-open .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .site-header.nav-open .nav-toggle__bar:nth-child(2),
  body.nav-open .nav-toggle__bar:nth-child(2) { opacity: 0; }
  .site-header.nav-open .nav-toggle__bar:nth-child(3),
  body.nav-open .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  @media (hover: hover) {
    .btn:hover { transform: translateY(-1px); }
    .btn--primary:hover { box-shadow: 0 0 0 1px rgba(56, 242, 255, 0.4), 0 0 55px -10px rgba(56, 242, 255, 0.7); }
    .card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--fs-cyan) 40%, var(--fs-border)); }
    .search__item:hover { background: color-mix(in srgb, var(--fs-cyan) 7%, var(--fs-surface)); }
    .article-nav a:hover { transform: translateY(-2px); }
    .back-to-top:hover { transform: translateY(-2px); }
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal,
  .reveal.is-visible {
    opacity: 1 !important;
    transform: none !important;
  }

  .hero__aurora { animation: none; }
}

@media (min-width: 640px) {
  .grid { gap: var(--fs-space-6); }
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--auto { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
  .article-nav { grid-template-columns: 1fr 1fr; }
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1200px) {
  .container { max-width: 1160px; }
}

@media (prefers-color-scheme: light) {
  .btn--primary {
    color: #ffffff;
    background: linear-gradient(135deg, #046b7a, #03545f);
    border-color: transparent;
  }
}