/* Base: reset, typography, layout primitives, accessibility. Mobile-first. */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--header-h) + var(--space-4)); }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-background);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.no-scroll { overflow: hidden; }
main { flex: 1; outline: none; }
img, svg { display: block; max-width: 100%; }
h1, h2, h3, h4 { margin: 0 0 var(--space-3); line-height: var(--leading-tight); color: var(--color-text); letter-spacing: -0.01em; }
h1 { font-size: var(--text-3xl); font-weight: 800; }
h2 { font-size: var(--text-2xl); font-weight: 700; }
h3 { font-size: var(--text-lg); font-weight: 650; }
p { margin: 0 0 var(--space-4); }
a { color: var(--color-primary); text-underline-offset: 3px; }
a:hover { color: var(--color-primary-hover); }
code, pre { font-family: var(--font-mono); font-size: 0.9em; }
code { background: var(--color-surface-2); padding: 0.1em 0.35em; border-radius: var(--radius-sm); }
pre { background: #0f172a; color: #e2e8f0; padding: var(--space-4); border-radius: var(--radius-md); overflow-x: auto; line-height: 1.5; }
pre code { background: none; padding: 0; color: inherit; }
ul, ol { padding-left: 1.25rem; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }

:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: var(--radius-sm); }
.skip-link { position: absolute; left: var(--space-4); top: -100px; z-index: 200; background: var(--color-primary); color: var(--color-on-primary); padding: var(--space-2) var(--space-4); border-radius: var(--radius-md); }
.skip-link:focus { top: var(--space-2); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Layout */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: max(var(--space-4), env(safe-area-inset-left));
  padding-right: max(var(--space-4), env(safe-area-inset-right));
}
.narrow { max-width: var(--container-narrow); }
.page-pad { padding-top: var(--space-8); padding-bottom: var(--space-16); }
.section { padding: var(--space-16) 0; }
.section-alt { background: var(--color-surface); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.section-head { max-width: 640px; margin-bottom: var(--space-8); }
.section-head p { color: var(--color-muted); font-size: var(--text-lg); }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); flex-wrap: wrap; }
.section-head.row-between { max-width: none; }
.muted { color: var(--color-muted); }
.small { font-size: var(--text-sm); }
.center { text-align: center; }
.lead { font-size: var(--text-lg); color: var(--color-text-2); }
.grad { background: var(--gradient-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.eyebrow { display: inline-flex; align-items: center; gap: var(--space-1); font-size: var(--text-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-primary); margin-bottom: var(--space-3); }

.show-sm, .show-md { display: none !important; }
@media (max-width: 767px) {
  .hide-sm { display: none !important; }
  .show-sm { display: inline-flex !important; }
  .section { padding: var(--space-12) 0; }
  .page-pad { padding-top: var(--space-6); }
}
@media (max-width: 1023px) {
  .show-md { display: inline-flex !important; }
}
@media (min-width: 768px) {
  .container { padding-left: var(--space-6); padding-right: var(--space-6); }
}