/* ============================================================
   layout.css — Structural layout
   The top nav and grid systems used across pages.
   ============================================================ */

/* ---- Top navigation ------------------------------------ */
.nav {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  /* A subtle hairline shadow when scrolled — kept restrained. */
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

/* Brand mark — a serif initial in a small bordered square,
   reminiscent of a library bookplate. */
.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.nav__brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  font-variation-settings: 'opsz' 144;
  background-color: var(--color-accent);
  color: var(--color-card);
  border-radius: var(--radius-sm);
  letter-spacing: 0;
}

.nav__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.nav__brand-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.nav__brand-sub {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
  margin-top: 4px;
}

.nav__links {
  display: flex;
  gap: var(--space-1);
  margin-left: var(--space-4);
}

.nav__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
  position: relative;
}

.nav__link:hover {
  color: var(--color-text);
  background-color: var(--color-card-alt);
}

.nav__link--active {
  color: var(--color-text);
}

.nav__link--active::after {
  content: '';
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: -1px;
  height: 2px;
  background-color: var(--color-accent);
}

/* Right-hand user block */
.nav__user {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav__user-info {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.1;
}

.nav__user-name {
  font-size: 0.875rem;
  font-weight: 500;
}

.nav__user-role {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-top: 3px;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.nav__user-role--admin {
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
}

.nav__user-role--patron {
  color: var(--color-info);
  background-color: var(--color-info-soft);
}

/* Mobile — collapse nav into vertical stack */
@media (max-width: 720px) {
  .nav__inner {
    flex-wrap: wrap;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
  }
  .nav__links {
    order: 3;
    width: 100%;
    margin-left: 0;
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-2);
  }
  .nav__user { margin-left: auto; }
  .nav__user-info { display: none; }
  .nav__brand-sub { display: none; }
}

/* ---- Grid systems -------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--stats {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grid--two-col {
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

@media (max-width: 880px) {
  .grid--two-col { grid-template-columns: 1fr; }
}