/* ═══════════════════════════════════════════════════════════════════════════
   FEDERATION OS — BASE LAYER
   fed-base.css · BUILD 02 · branch federation-os-v2
   ───────────────────────────────────────────────────────────────────────────
   Future shared baseline for Command / Dossier / FCC / Archive / Research /
   Council. NOT attached to any production page in BUILD 02.
   Requires: fed-tokens.css loaded first (canonical token source).
   ═══════════════════════════════════════════════════════════════════════ */

/* ── Box model ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

/* ── Document defaults ─────────────────────────────────────────────────── */
html { -webkit-text-size-adjust: 100%; }

body.fed-body-root {
  background: var(--surface-space);
  color: var(--fed-text);
  font-family: var(--font-fed-body);
  font-size: var(--text-base);            /* 16px body target */
  line-height: var(--line-body);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ── Typography role utilities ─────────────────────────────────────────── */
.fed-display {
  font-family: var(--font-fed-display);
  font-weight: 900;
  font-size: var(--display-sm);
  line-height: var(--line-display);
  color: var(--fed-text-display);
  letter-spacing: -0.01em;
  text-transform: uppercase;
}
.fed-display--lg { font-size: var(--display-lg); }

.fed-heading {
  font-family: var(--font-fed-display);
  font-weight: 700;
  font-size: var(--heading-md);
  line-height: var(--line-heading);
  color: var(--fed-text-display);
}
.fed-heading--sm { font-size: var(--heading-sm); }
.fed-heading--lg { font-size: var(--heading-lg); }

.fed-body-text {
  font-family: var(--font-fed-body);
  font-size: var(--text-base);
  line-height: var(--line-body);
  color: var(--fed-text);
  max-width: var(--fed-reading-max);       /* ≈65–75ch */
}

.fed-interface {
  font-family: var(--font-fed-interface);
  font-weight: 600;
  font-size: var(--text-base);
  line-height: var(--line-heading);
}

/* System/metadata type — 12px floor enforced here. Never 8–9px. */
.fed-system {
  font-family: var(--font-fed-system);
  font-size: var(--text-xs);               /* 12px floor */
  line-height: var(--line-system);
  letter-spacing: var(--system-letter-spacing);
  color: var(--fed-muted);
}
.fed-system--wide { letter-spacing: var(--system-letter-spacing-wide); }
.fed-system--bright { color: var(--fed-text); }

.fed-eyebrow {
  font-family: var(--font-fed-system);
  font-size: var(--text-xs);
  letter-spacing: var(--system-letter-spacing-wide);
  text-transform: uppercase;
  color: var(--fed-command);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.fed-eyebrow::before {
  content: "";
  width: 20px; height: 1px;
  background: currentColor;
}

/* ── Selection ─────────────────────────────────────────────────────────── */
::selection {
  background: var(--fed-command-soft);
  color: var(--fed-text-display);
}

/* ── Focus — canonical ring, visible, never removed ────────────────────── */
:focus-visible {
  outline: var(--focus-width) solid var(--focus-color);
  outline-offset: var(--focus-offset);
  border-radius: 2px;
}
:focus:not(:focus-visible) { outline: none; }

/* ── Links ─────────────────────────────────────────────────────────────── */
.fed-scope a {
  color: var(--fed-command);
  text-decoration: underline;
  text-decoration-color: var(--fed-command-soft);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--motion-micro) var(--ease-fed);
}
.fed-scope a:hover { text-decoration-color: var(--fed-command); }

/* ── Media defaults ────────────────────────────────────────────────────── */
img, svg, video { display: block; max-width: 100%; height: auto; }

/* ── Screen-reader utility ─────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ── Containers & gutters (breakpoints: 640 / 1024 / 1440 explicit) ────── */
.fed-container {
  width: 100%;
  max-width: var(--fed-content-max);
  margin-inline: auto;
  padding-inline: var(--fed-gutter-mobile);       /* ≤639 → 20px */
}
@media (min-width: 640px)  { .fed-container { padding-inline: var(--fed-gutter-tablet); } }
@media (min-width: 1024px) { .fed-container { padding-inline: var(--fed-gutter-desktop); } }

.fed-reading {
  max-width: var(--fed-reading-max);
  margin-inline: auto;
}

/* ── Reduced motion — FEDERATION OS convention (tokens file §motion):
     remove non-essential reveals / seal activation / network-line drawing /
     decorative motion; preserve functional transitions. ─────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}