/* =====================================================================
   Foundation — document reset, typography, focus and layout primitives.
   Every value comes from tokens.css. No colour or font literal here.
   ===================================================================== */

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

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

body {
  margin: 0;
  background: var(--lif-ground);
  color: var(--lif-ink);
  font-family: var(--lif-font-body);
  font-size: var(--lif-size-md);
  line-height: var(--lif-leading);
}

h1, h2, h3, h4 {
  margin: 0;
  line-height: var(--lif-leading-tight);
  font-weight: 600;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
img { max-width: 100%; height: auto; }

a {
  color: var(--lif-accent-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover { color: var(--lif-accent-strong); }

/* A visible focus ring on every interactive element. Focus is never
   removed, and meaning is never carried by hover or colour alone. */
:focus-visible {
  outline: 3px solid var(--lif-accent-strong);
  outline-offset: 2px;
  border-radius: var(--lif-radius-sm);
}

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

.lif-skip-link {
  position: absolute;
  left: var(--lif-space-4);
  top: calc(var(--lif-space-4) * -6);
  z-index: 20;
  padding: var(--lif-space-3) var(--lif-space-4);
  background: var(--lif-surface-raised);
  border: 2px solid var(--lif-accent-strong);
  border-radius: var(--lif-radius-sm);
  font-family: var(--lif-font-ui);
  transition: top var(--lif-motion-quick) var(--lif-motion-ease);
}
.lif-skip-link:focus { top: var(--lif-space-4); }

/* ---- Application layout ---- */
.lif-app {
  display: grid;
  grid-template-columns: var(--lif-sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
}
.lif-app[data-sidebar="hidden"] { grid-template-columns: minmax(0, 1fr); }

.lif-main {
  min-width: 0;
  padding: var(--lif-space-6) var(--lif-space-6) var(--lif-space-8);
}

.lif-main__inner {
  max-width: 72rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--lif-space-6);
}

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

/* ---- Responsive: the welcome hierarchy is preserved on small screens.
       The Playground never collapses into a feed above a menu. ---- */
@media (max-width: 60rem) {
  .lif-app { grid-template-columns: minmax(0, 1fr); }
  .lif-main { padding: var(--lif-space-5) var(--lif-space-4) var(--lif-space-7); }
}

/* ---- Gentle motion, and none at all when the member asks for none ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}