/* =============================================================
   FINAL UI — primitives (Sprint 1)
   Toast · Skeleton · EmptyState · ConfirmDialog · Field validation
   Tokens borrowed from final.css (--f-*)
   ============================================================= */

/* ---------- TOAST STACK ---------- */
.fui-toast-stack {
  position: fixed;
  inset-block-end: 24px;
  inset-inline-end: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
  max-width: min(420px, calc(100vw - 32px));
}
.fui-toast {
  pointer-events: auto;
  position: relative;
  display: grid;
  grid-template-columns: 4px 26px 1fr auto auto;
  align-items: center;
  gap: 10px;
  padding: 12px 14px 12px 10px;
  background: var(--f-surface);
  border: 1px solid var(--f-border);
  border-radius: var(--f-r-md);
  box-shadow: var(--f-shadow-md);
  font-family: var(--f-arab);
  color: var(--f-ink);
  overflow: hidden;
  transform: translateY(8px);
  opacity: 0;
  animation: fui-toast-in .28s var(--f-spring) forwards;
}
@keyframes fui-toast-in {
  to { transform: translateY(0); opacity: 1; }
}
.fui-toast__rail {
  width: 4px; height: 100%;
  border-radius: var(--f-r-xs);
  background: var(--f-ink-3);
}
.fui-toast--success .fui-toast__rail { background: var(--f-ok); }
.fui-toast--error   .fui-toast__rail { background: var(--f-err); }
.fui-toast--warn    .fui-toast__rail { background: var(--f-warn); }
.fui-toast--info    .fui-toast__rail { background: var(--f-navy); }

.fui-toast__ico {
  display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 999px;
  background: color-mix(in srgb, var(--f-surface-2) 80%, transparent);
  color: var(--f-ink-2);
}
.fui-toast--success .fui-toast__ico { color: var(--f-ok); background: color-mix(in srgb, var(--f-ok) 14%, transparent); }
.fui-toast--error   .fui-toast__ico { color: var(--f-err); background: color-mix(in srgb, var(--f-err) 14%, transparent); }
.fui-toast--warn    .fui-toast__ico { color: var(--f-warn); background: color-mix(in srgb, var(--f-warn) 14%, transparent); }
.fui-toast--info    .fui-toast__ico { color: var(--f-navy); background: color-mix(in srgb, var(--f-navy) 12%, transparent); }
.fui-toast__ico .material-symbols-outlined { font-size: 18px; }

.fui-toast__title {
  font-weight: 700;
  font-size: 0.88rem;
  line-height: 1.2;
}
.fui-toast__text {
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--f-ink-2);
  margin-top: 2px;
}
.fui-toast__action {
  border: 0;
  background: transparent;
  font-family: var(--f-arab);
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--f-navy);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--f-r-sm);
}
.fui-toast__action:hover { background: var(--f-surface-2); }
.fui-toast__close {
  border: 0;
  background: transparent;
  color: var(--f-ink-3);
  cursor: pointer;
  display: inline-grid; place-items: center;
  width: 24px; height: 24px;
  border-radius: var(--f-r-sm);
}
.fui-toast__close:hover { background: var(--f-surface-2); color: var(--f-ink); }
.fui-toast__close .material-symbols-outlined { font-size: 16px; }

/* ---------- SKELETON ---------- */
.fui-skel {
  display: inline-block;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--f-surface-3) 60%, transparent) 0%,
    color-mix(in srgb, var(--f-surface-2) 90%, transparent) 50%,
    color-mix(in srgb, var(--f-surface-3) 60%, transparent) 100%);
  background-size: 200% 100%;
  animation: fui-skel-shimmer 1.4s var(--f-ease) infinite;
}
@keyframes fui-skel-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.fui-skel-card {
  padding: 18px;
  border-radius: var(--f-r-md);
  background: var(--f-surface);
  border: 1px solid var(--f-border);
}
.fui-skel-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--f-border);
}
.fui-skel-row:last-child { border-bottom: 0; }

@media (prefers-reduced-motion: reduce) {
  .fui-skel { animation: none; }
}

/* ---------- EMPTY STATE ---------- */
.fui-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 48px 24px;
  text-align: center;
}
.fui-empty__art {
  position: relative;
  width: 88px; height: 88px;
  display: inline-grid; place-items: center;
  margin-bottom: 6px;
}
.fui-empty__halo {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle,
    color-mix(in srgb, var(--f-gold) 18%, transparent) 0%,
    transparent 65%);
}
.fui-empty__ico {
  position: relative;
  display: inline-grid; place-items: center;
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--f-surface);
  border: 1px solid var(--f-border-2);
  color: var(--f-ink-3);
  box-shadow: var(--f-shadow-sm);
}
.fui-empty__ico .material-symbols-outlined { font-size: 30px; }
.fui-empty__title {
  margin: 4px 0 0;
  font-family: var(--f-disp);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--f-ink);
}
.fui-empty__body {
  margin: 0 0 6px;
  font-size: 0.85rem;
  color: var(--f-ink-3);
  max-width: 36ch;
  line-height: 1.5;
}

/* ---------- CONFIRM / MODAL ---------- */
.fui-modal {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: grid;
  place-items: center;
  padding: 20px;
}
.fui-modal__veil {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--f-ink) 38%, transparent);
  backdrop-filter: blur(2px);
  animation: fui-veil-in .2s ease forwards;
}
@keyframes fui-veil-in { from { opacity: 0; } to { opacity: 1; } }

.fui-modal__sheet {
  position: relative;
  width: min(420px, calc(100vw - 32px));
  background: var(--f-surface);
  border: 1px solid var(--f-border);
  border-radius: var(--f-r-lg);
  box-shadow: var(--f-shadow-md), 0 1px 0 rgba(255,255,255,0.7) inset;
  padding: 22px;
  font-family: var(--f-arab);
  transform: translateY(10px) scale(.98);
  opacity: 0;
  animation: fui-sheet-in .28s var(--f-spring) forwards;
}
@keyframes fui-sheet-in {
  to { transform: translateY(0) scale(1); opacity: 1; }
}
.fui-modal__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.fui-modal__ico {
  display: inline-grid; place-items: center;
  width: 36px; height: 36px;
  border-radius: var(--f-r-sm);
  background: color-mix(in srgb, var(--f-navy) 10%, transparent);
  color: var(--f-navy);
}
.fui-modal__sheet.is-danger .fui-modal__ico {
  background: color-mix(in srgb, var(--f-err) 12%, transparent);
  color: var(--f-err);
}
.fui-modal__title {
  margin: 0;
  font-family: var(--f-disp);
  font-size: 1rem;
  font-weight: 700;
  color: var(--f-ink);
}
.fui-modal__desc {
  margin: 0 0 14px;
  font-size: 0.85rem;
  color: var(--f-ink-2);
  line-height: 1.55;
}
.fui-modal__foot {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 6px;
}
.fui-btn-danger {
  background: var(--f-err);
  color: var(--f-bg);
  border-color: var(--f-err);
}
.fui-btn-danger:hover { background: color-mix(in srgb, var(--f-err) 88%, black); }

/* ---------- FIELD VALIDATION ---------- */
.fui-field-err {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 4px;
  font-size: 0.74rem;
  color: var(--f-err);
  line-height: 1.2;
}
.fui-field-err .material-symbols-outlined { font-size: 14px; }
.fui-field-help {
  margin-top: 4px;
  font-size: 0.74rem;
  color: var(--f-ink-3);
}

/* invalid input ring */
.ff-field.is-invalid input,
.ff-field.is-invalid select,
.ff-field.is-invalid textarea {
  border-color: var(--f-err) !important;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--f-err) 14%, transparent) !important;
}

/* validation summary banner */
.fui-valsum {
  margin: 12px 0;
  padding: 12px 14px;
  border-radius: var(--f-r);
  background: color-mix(in srgb, var(--f-err) 7%, var(--f-surface));
  border: 1px solid color-mix(in srgb, var(--f-err) 30%, var(--f-border));
  font-family: var(--f-arab);
  color: var(--f-ink);
}
.fui-valsum__head {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  color: var(--f-err);
}
.fui-valsum__head .material-symbols-outlined { font-size: 18px; }
.fui-valsum ul {
  margin: 6px 0 0;
  padding-inline-start: 22px;
  font-size: 0.8rem;
  color: var(--f-ink-2);
  line-height: 1.6;
}
.fui-valsum__more { color: var(--f-ink-3); }

/* ---------- DARK MODE ---------- */
.f-body.dark .fui-toast,
.f-body.dark .fui-modal__sheet,
.f-body.dark .fui-skel-card {
  background: color-mix(in srgb, var(--f-surface) 85%, #000);
  border-color: var(--f-border-2);
}
.f-body.dark .fui-empty__ico {
  background: color-mix(in srgb, var(--f-surface) 70%, #000);
}