/* ==========================================================================
   components.css — Reusable components
   Authority: PRD v1.1 §11.1 (nav/footer), §14 (cards), FR-031 (status), NFR-011
   ========================================================================== */

/* --- Site header + primary navigation (FR-002, FR-003, FR-004, FR-005) --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: color-mix(in srgb, var(--c-bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: var(--border-w) solid var(--c-border-soft);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  min-height: 4rem;
}
.brand {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: var(--fs-400);
  color: var(--c-primary);
  text-decoration: none;
  white-space: nowrap;
}
.brand:hover { color: var(--c-primary); }
.brand small {
  display: block;
  font-family: var(--font-body);
  font-size: var(--fs-100);
  font-weight: var(--fw-regular);
  color: var(--c-text-subtle);
  letter-spacing: 0.02em;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: transparent;
  border: var(--border-w) solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: var(--sp-2) var(--sp-3);
  cursor: pointer;
  color: var(--c-text);
}
.nav-toggle__bars { width: 18px; height: 12px; position: relative; display: inline-block; }
.nav-toggle__bars::before,
.nav-toggle__bars::after,
.nav-toggle__bars span {
  content: ""; position: absolute; left: 0; right: 0; height: 2px;
  background: currentColor; border-radius: 2px;
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars span { top: 5px; }
.nav-toggle__bars::after { bottom: 0; }

.primary-nav ul {
  list-style: none;
  display: flex;
  gap: var(--sp-5);
  padding: 0;
  margin: 0;
}
.primary-nav a {
  color: var(--c-text);
  text-decoration: none;
  font-weight: var(--fw-medium);
  padding: var(--sp-2) 0;
  position: relative;
}
.primary-nav a:hover { color: var(--c-accent); }
/* current-page state: NOT color-only (FR-004) — underline weight + aria-current */
.primary-nav a[aria-current="page"] {
  color: var(--c-primary);
  font-weight: var(--fw-semibold);
  border-bottom: 2px solid var(--c-accent);
}

/* --- Footer (FR-007) --- */
.site-footer {
  background: var(--c-primary);
  color: var(--c-text-invert);
  padding-block: var(--sp-7);
  margin-top: var(--sp-8);
}
.site-footer a { color: var(--color-accent-050); }
.site-footer :focus-visible { outline-color: var(--c-focus-on-dark); }
.btn--primary:focus-visible { outline-color: var(--c-focus-on-dark); }
.site-footer__grid {
  display: grid;
  gap: var(--sp-6);
  grid-template-columns: 1fr;
}
.site-footer nav ul { list-style: none; padding: 0; display: grid; gap: var(--sp-2); }
.site-footer__meta {
  margin-top: var(--sp-6);
  padding-top: var(--sp-4);
  border-top: 1px solid color-mix(in srgb, var(--c-text-invert) 20%, transparent);
  font-size: var(--fs-200);
  color: color-mix(in srgb, var(--c-text-invert) 78%, transparent);
}

/* --- Buttons (FR-010 CTAs) --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: var(--fw-semibold);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--motion-base) var(--motion-ease),
              color var(--motion-base) var(--motion-ease),
              border-color var(--motion-base) var(--motion-ease);
}
.btn--primary { background: var(--c-primary); color: var(--c-text-invert); }
.btn--primary:hover { background: var(--c-primary-hover); color: var(--c-text-invert); }
.btn--ghost { border-color: var(--c-border); color: var(--c-primary); }
.btn--ghost:hover { border-color: var(--c-primary); color: var(--c-primary); }

/* --- Card (research/teaching/ecosystem/publication shells) --- */
.card {
  background: var(--c-bg-raised);
  border: var(--border-w) solid var(--c-border-soft);
  border-radius: var(--radius-md);
  padding: var(--sp-5);
  box-shadow: var(--shadow-sm);
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  position: relative;
  transition: box-shadow var(--motion-base) var(--motion-ease),
              border-color var(--motion-base) var(--motion-ease),
              transform var(--motion-base) var(--motion-ease);
}
.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--c-border);
  transform: translateY(-2px);
}
.card__title { font-size: var(--fs-400); font-family: var(--font-display); color: var(--c-primary); }
.card__meta { font-size: var(--fs-200); color: var(--c-text-subtle); display: flex; flex-wrap: wrap; gap: var(--sp-2); align-items: center; }
.card__body { color: var(--c-text-muted); }
.card__body > * { max-width: none; }
.card__footer { margin-top: auto; padding-top: var(--sp-2); }

.card-grid {
  display: grid;
  gap: var(--sp-5);
  grid-template-columns: 1fr;
}

/* --- Status badge (FR-031 controlled vocabulary; not color-only: text label) --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-100);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.02em;
  padding: 0.15em 0.6em;
  border-radius: 999px;
  border: 1px solid currentColor;
  line-height: 1.4;
}
.badge::before {
  content: "";
  width: 0.5em; height: 0.5em;
  border-radius: 50%;
  background: currentColor;
}
.badge--live        { color: var(--c-status-live); }
.badge--pilot       { color: var(--c-status-pilot); }
.badge--development { color: var(--c-status-development); }
.badge--planned     { color: var(--c-status-planned); }
.badge--archived    { color: var(--c-status-archived); }
.badge--private     { color: var(--c-status-private); }

/* --- Access-level tag (teaching public vs restricted, FR-023) --- */
.tag {
  display: inline-block;
  font-size: var(--fs-100);
  font-weight: var(--fw-medium);
  padding: 0.1em 0.55em;
  border-radius: var(--radius-sm);
  background: var(--c-accent-soft);
  color: var(--c-accent-600);
}
.tag--restricted { background: color-mix(in srgb, var(--c-warning) 14%, var(--c-bg)); color: var(--c-warning); }

/* --- Definition-style meta lists (contact, publication fields) --- */
.meta-list { display: grid; gap: var(--sp-3); }
.meta-list div { display: grid; gap: 0.1rem; }
.meta-list dt { font-size: var(--fs-100); text-transform: uppercase; letter-spacing: 0.06em; color: var(--c-text-subtle); }
.meta-list dd { margin: 0; font-weight: var(--fw-medium); }

/* --- Empty/degraded state message (NFR-009) — used when a data source is absent --- */
.notice {
  border: 1px dashed var(--c-border);
  border-radius: var(--radius-md);
  padding: var(--sp-5);
  color: var(--c-text-muted);
  background: var(--c-bg-alt);
}

/* ==========================================================================
   Adaptive collection controls (v1.1) — render ONLY above content thresholds.
   Built from existing tokens; no new colour system or layout language.
   Below threshold these never appear, so v1.0 pages are unchanged.
   ========================================================================== */
.collection-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  align-items: center;
  margin-bottom: var(--sp-6);
}
.filter-field { display: inline-flex; align-items: center; }
.filter-field input[type="search"],
.filter-field select {
  font: inherit;
  color: var(--c-text);
  background: var(--c-bg);
  border: var(--border-w) solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: var(--sp-2) var(--sp-3);
  min-height: 2.5rem;
}
.filter-field--search { flex: 1 1 16rem; }
.filter-field--search input[type="search"] { width: 100%; }

.pager {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  justify-content: center;
  margin-top: var(--sp-7);
}
.pager__status { color: var(--c-text-subtle); font-size: var(--fs-200); }
.pager [aria-disabled="true"] { opacity: 0.5; pointer-events: none; }

/* Featured emphasis — reuses card + accent token, no new visual language */
.card--featured { border-color: var(--c-accent); box-shadow: var(--shadow-md); }
.card__featured-flag {
  display: inline-block;
  font-size: var(--fs-100);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.02em;
  color: var(--c-accent);
}

/* Auto-detected cover image on cards (books, etc.) — optional, in-system */
.card__cover {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: var(--sp-2);
}