*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 1rem); }
body { margin: 0; font-family: var(--font-sans); color: var(--color-text); background: var(--color-bg); line-height: var(--line-body); text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; }
body.is-locked { overflow: hidden; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
img, svg { max-width: 100%; }
img { display: block; }
hr { border: 0; border-top: 1px solid var(--color-border); margin: var(--space-8) 0; }
::selection { background: rgba(91, 124, 250, .28); }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }

h1, h2, h3, h4 { margin: 0 0 var(--space-4); line-height: var(--line-heading); letter-spacing: var(--tracking-tight); }
h1 { font-size: clamp(2.75rem, 7vw, var(--font-size-72)); }
h2 { font-size: clamp(2rem, 4vw, var(--font-size-40)); }
h3 { font-size: clamp(1.25rem, 2vw, var(--font-size-24)); }
h4 { font-size: var(--font-size-18); }
p { margin: 0 0 var(--space-4); }
ul, ol { margin-top: 0; }
code, pre { font-family: var(--font-mono); }
code { background: var(--color-surface-muted); border: 1px solid var(--color-border); border-radius: var(--radius-6); padding: .12em .35em; }
pre { overflow: auto; padding: var(--space-5); border-radius: var(--radius-14); background: var(--pxf-ink-950); color: #E8EEFA; }

.container { width: min(calc(100% - 2rem), var(--container)); margin-inline: auto; }
.container-wide { width: min(calc(100% - 2rem), var(--container-wide)); margin-inline: auto; }
.container-sm { width: min(calc(100% - 2rem), var(--container-sm)); margin-inline: auto; }
.section { padding: clamp(4rem, 8vw, 7rem) 0; }
.section-compact { padding: clamp(2.5rem, 5vw, 4rem) 0; }
.section-surface { background: var(--color-surface); }
.section-muted { background: var(--color-surface-muted); }
.section-dark { background: var(--gradient-dark); color: var(--color-text-inverse); }
.section-heading { max-width: 800px; margin-bottom: var(--space-10); }
.section-heading p { color: var(--color-text-muted); font-size: var(--font-size-18); }
.section-dark .section-heading p { color: #C8D2E4; }
.eyebrow { display: inline-flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-4); color: var(--color-primary); font-size: var(--font-size-12); font-weight: 800; letter-spacing: var(--tracking-label); text-transform: uppercase; }
.section-dark .eyebrow { color: var(--pxf-cyan-300); }
.lead { max-width: 780px; color: var(--color-text-muted); font-size: clamp(1.05rem, 2vw, 1.3rem); }
.section-dark .lead { color: #D7E0EF; }
.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.stack { display: grid; gap: var(--space-4); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); }
.visually-hidden { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0,0,0,0) !important; white-space: nowrap !important; border: 0 !important; }
.skip-link { position: fixed; left: 1rem; top: -6rem; z-index: 10000; background: var(--color-surface); color: var(--color-text); padding: .75rem 1rem; border-radius: var(--radius-10); box-shadow: var(--shadow-md); }
.skip-link:focus { top: 1rem; }

@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 680px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section { padding: 4rem 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}