/* ============================================================
   components.css — botones, inputs, tabla, modal, cards,
   badges, toast, alerts. Specs: design-system/MASTER.md
   ============================================================ */

/* ====================== Botones ====================== */
.btn {
  --btn-bg: var(--surface);
  --btn-fg: var(--text);
  --btn-bd: var(--border-strong);
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--sp-2);
  min-height: 44px; padding: 0 var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--btn-bg); color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  font-size: var(--fs-14); font-weight: 600;
  cursor: pointer; white-space: nowrap;
  transition: transform .12s ease-out, background .15s ease-out,
              box-shadow .15s ease-out, opacity .15s ease-out;
  position: relative;
}
.btn:hover { background: var(--surface-2); }
.btn:active { transform: translateY(1px); }
.btn svg { width: 18px; height: 18px; stroke: currentColor; }

.btn--primary {
  --btn-bg: var(--accent); --btn-fg: var(--on-accent); --btn-bd: transparent;
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover { background: color-mix(in srgb, var(--accent) 88%, #000); }

.btn--ghost { --btn-bg: transparent; --btn-bd: transparent; --btn-fg: var(--text-muted); }
.btn--ghost:hover { background: var(--surface-2); color: var(--text); }

.btn--danger { --btn-bg: transparent; --btn-fg: var(--danger); --btn-bd: var(--danger); }
.btn--danger:hover { background: var(--danger-bg); }

.btn--whatsapp { --btn-bg:#25D366; --btn-fg:#06351b; --btn-bd:transparent; }
.btn--whatsapp:hover { background: color-mix(in srgb, #25D366 88%, #000); color:#fff; }

.btn--sm { min-height: 36px; padding: 0 var(--sp-3); font-size: var(--fs-12); }
.btn--block { width: 100%; }

.btn:disabled, .btn.is-loading { opacity: .65; cursor: not-allowed; pointer-events: none; }
.btn.is-loading .btn__label { visibility: hidden; }
.btn.is-loading::after {
  content: ""; position: absolute;
  width: 18px; height: 18px; border-radius: 50%;
  border: 2px solid currentColor; border-top-color: transparent;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* botón icono (acciones de fila) */
.icon-btn {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  display: grid; place-items: center; color: var(--text-muted);
  border: 1px solid transparent;
  transition: background .15s ease-out, color .15s ease-out;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn svg { width: 18px; height: 18px; stroke: currentColor; }
.icon-btn--danger:hover { background: var(--danger-bg); color: var(--danger); }

/* ====================== Cards ====================== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: var(--sp-5);
}
.card--flush { padding: 0; overflow: hidden; }
.card__head {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-3); padding: var(--sp-4) var(--sp-5);
  border-bottom: 1px solid var(--border);
}
.card__title { font-size: var(--fs-16); font-weight: 600; }
.card__body { padding: var(--sp-5); }

/* ====================== Métricas (dashboard) ====================== */
.metric-grid {
  display: grid; gap: var(--sp-4);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-bottom: var(--sp-6);
}
.metric {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
  padding: var(--sp-5);
  display: flex; flex-direction: column; gap: var(--sp-3);
}
.metric__top { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-2); }
.metric__label { font-size: var(--fs-14); color: var(--text-muted); font-weight: 500; }
.metric__icon {
  width: 38px; height: 38px; border-radius: var(--radius-sm);
  display: grid; place-items: center; flex: 0 0 auto;
}
.metric__icon svg { width: 20px; height: 20px; }
.metric__icon--accent { background: color-mix(in srgb, var(--accent) 14%, transparent); }
.metric__icon--accent svg { stroke: var(--accent); }
.metric__icon--info { background: var(--info-bg); }
.metric__icon--info svg { stroke: var(--info); }
.metric__icon--warning { background: var(--warning-bg); }
.metric__icon--warning svg { stroke: var(--warning); }
.metric__icon--danger { background: var(--danger-bg); }
.metric__icon--danger svg { stroke: var(--danger); }
.metric__value { font-size: var(--fs-32); font-weight: 700; line-height: 1; letter-spacing: -.02em; }
.metric__hint { font-size: var(--fs-12); color: var(--text-subtle); }

/* ====================== Badges ====================== */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 9px; border-radius: 999px;
  font-size: var(--fs-12); font-weight: 600; line-height: 1.4;
  background: var(--surface-2); color: var(--text-muted);
}
.badge svg { width: 13px; height: 13px; stroke: currentColor; }
.badge--success { background: var(--success-bg); color: var(--success); }
.badge--warning { background: var(--warning-bg); color: var(--warning); }
.badge--danger  { background: var(--danger-bg);  color: var(--danger); }
.badge--info    { background: var(--info-bg);    color: var(--info); }
.badge--muted   { background: var(--surface-2);  color: var(--text-subtle); }

/* ====================== Tabla ====================== */
.table-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.table-scroll { overflow-x: auto; }
.data-table { width: 100%; font-size: var(--fs-14); }
.data-table thead th {
  position: sticky; top: 0; z-index: 1;
  background: var(--surface-2);
  text-align: left; font-weight: 600; color: var(--text-muted);
  font-size: var(--fs-12); text-transform: uppercase; letter-spacing: .03em;
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table tbody td {
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  color: var(--text); vertical-align: middle;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr { transition: background .12s ease-out; }
.data-table tbody tr:hover { background: var(--surface-2); }
.data-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.data-table .col-actions { text-align: right; white-space: nowrap; }
.data-table .row-actions { display: inline-flex; gap: 4px; justify-content: flex-end; }
.cell-strong { font-weight: 600; }
.cell-sku { font-variant-numeric: tabular-nums; color: var(--text-muted); font-size: var(--fs-12); }

/* fila stock crítico */
.data-table tr.is-critical td { background: color-mix(in srgb, var(--danger-bg) 50%, transparent); }
.data-table tr.is-critical:hover td { background: var(--danger-bg); }

/* estado vacío */
.empty-state {
  padding: var(--sp-8) var(--sp-5);
  text-align: center; color: var(--text-muted);
}
.empty-state__icon {
  width: 52px; height: 52px; margin: 0 auto var(--sp-4);
  border-radius: var(--radius); background: var(--surface-2);
  display: grid; place-items: center;
}
.empty-state__icon svg { width: 26px; height: 26px; stroke: var(--text-subtle); }
.empty-state h3 { margin-bottom: 6px; color: var(--text); }
.empty-state p { margin-bottom: var(--sp-4); font-size: var(--fs-14); }

/* ====================== Toolbar (búsqueda) ====================== */
.toolbar {
  display: flex; align-items: center; gap: var(--sp-3);
  flex-wrap: wrap; margin-bottom: var(--sp-4);
}
.search-field { position: relative; flex: 1 1 280px; max-width: 420px; }
.search-field svg {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; stroke: var(--text-subtle); pointer-events: none;
}
.search-field input { padding-left: 40px; }

/* ====================== Formularios ====================== */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--sp-4); }
.field__label { font-size: var(--fs-14); font-weight: 500; color: var(--text); }
.field__label .req { color: var(--danger); margin-left: 2px; }
.field__hint { font-size: var(--fs-12); color: var(--text-subtle); }
.field__error {
  font-size: var(--fs-12); color: var(--danger);
  display: none; align-items: center; gap: 5px;
}
.field__error svg { width: 13px; height: 13px; stroke: currentColor; flex:0 0 auto; }
.field.has-error .field__error { display: flex; }
.field.has-error .input, .field.has-error .select, .field.has-error .textarea { border-color: var(--danger); }

.input, .select, .textarea {
  width: 100%; min-height: 44px;
  padding: 10px var(--sp-3);
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: var(--fs-14);
  transition: border-color .15s ease-out, box-shadow .15s ease-out;
}
.textarea { min-height: 88px; resize: vertical; padding-top: 10px; }
.input::placeholder, .textarea::placeholder { color: var(--text-subtle); }
.input:focus, .select:focus, .textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
}
.select { appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center; padding-right: 38px;
}
.form-grid { display: grid; gap: 0 var(--sp-4); grid-template-columns: 1fr 1fr; }
.form-grid .field--full { grid-column: 1 / -1; }
@media (max-width: 560px){ .form-grid { grid-template-columns: 1fr; } }

/* color picker (branding) */
.color-field { display: flex; flex-direction: column; gap: 6px; }
.color-row { display: flex; align-items: center; gap: var(--sp-3); }
.color-swatch {
  width: 48px; height: 44px; padding: 0; border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); cursor: pointer; background: none; flex: 0 0 auto;
}
.color-swatch::-webkit-color-swatch-wrapper { padding: 4px; }
.color-swatch::-webkit-color-swatch { border: none; border-radius: 4px; }
.color-hex { flex: 1 1 auto; text-transform: uppercase; font-variant-numeric: tabular-nums; }

/* ====================== Modal ====================== */
.modal {
  position: fixed; inset: 0; z-index: 100;
  display: none; align-items: flex-start; justify-content: center;
  padding: var(--sp-5);
  overflow-y: auto;
}
.modal.is-open { display: flex; }
.modal__scrim {
  position: fixed; inset: 0; background: rgba(15,23,42,.5);
  opacity: 0; transition: opacity .2s ease-out;
}
.modal.is-open .modal__scrim { opacity: 1; }
.modal__dialog {
  position: relative;
  width: 100%; max-width: 560px;
  margin: clamp(16px, 6vh, 80px) auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0; transform: scale(.96) translateY(8px);
  transition: opacity .2s ease-out, transform .2s ease-out;
}
.modal.is-open .modal__dialog { opacity: 1; transform: scale(1) translateY(0); }
.modal__head {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-3); padding: var(--sp-5) var(--sp-5) var(--sp-4);
  border-bottom: 1px solid var(--border);
}
.modal__title { font-size: var(--fs-18); font-weight: 600; }
.modal__body { padding: var(--sp-5); }
.modal__foot {
  display: flex; justify-content: flex-end; gap: var(--sp-3);
  padding: var(--sp-4) var(--sp-5); border-top: 1px solid var(--border);
}
.modal__close {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  display: grid; place-items: center; color: var(--text-muted);
}
.modal__close:hover { background: var(--surface-2); color: var(--text); }
.modal__close svg { width: 20px; height: 20px; stroke: currentColor; }

@media (prefers-reduced-motion: reduce) {
  .modal__dialog, .modal__scrim { transition: none; }
}

/* ====================== Alert cards (dashboard) ====================== */
.alert-list { display: grid; gap: var(--sp-3); }
.alert-card {
  display: flex; align-items: flex-start; gap: var(--sp-4);
  padding: var(--sp-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--warning);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.alert-card--critical { border-left-color: var(--danger); }
.alert-card__icon {
  width: 38px; height: 38px; border-radius: var(--radius-sm);
  display: grid; place-items: center; flex: 0 0 auto;
  background: var(--warning-bg);
}
.alert-card--critical .alert-card__icon { background: var(--danger-bg); }
.alert-card__icon svg { width: 20px; height: 20px; stroke: var(--warning); }
.alert-card--critical .alert-card__icon svg { stroke: var(--danger); }
.alert-card__body { flex: 1 1 auto; min-width: 0; }
.alert-card__title { font-weight: 600; margin-bottom: 2px; }
.alert-card__meta { font-size: var(--fs-12); color: var(--text-muted); display: flex; gap: var(--sp-3); flex-wrap: wrap; align-items: center; }
.alert-card__actions { display: flex; align-items: center; gap: var(--sp-2); flex-wrap: wrap; margin-top: var(--sp-3); }

/* ====================== Toast ====================== */
.toast-region {
  position: fixed; right: var(--sp-5); bottom: var(--sp-5);
  z-index: 200; display: flex; flex-direction: column; gap: var(--sp-2);
  max-width: min(92vw, 380px);
}
.toast {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border);
  border-left: 4px solid var(--info);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  animation: toast-in .22s ease-out;
}
.toast.is-leaving { animation: toast-out .2s ease-in forwards; }
.toast svg { width: 18px; height: 18px; flex: 0 0 auto; stroke: currentColor; }
.toast--success { border-left-color: var(--success); }
.toast--success svg { stroke: var(--success); }
.toast--error { border-left-color: var(--danger); }
.toast--error svg { stroke: var(--danger); }
.toast--warning { border-left-color: var(--warning); }
.toast--warning svg { stroke: var(--warning); }
.toast__msg { font-size: var(--fs-14); }
@keyframes toast-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes toast-out { to { opacity: 0; transform: translateY(10px); } }

/* ====================== Inline alert (form-level) ====================== */
.inline-alert {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4); border-radius: var(--radius-sm);
  font-size: var(--fs-14); margin-bottom: var(--sp-4);
}
.inline-alert svg { width: 18px; height: 18px; flex: 0 0 auto; stroke: currentColor; }
.inline-alert--error { background: var(--danger-bg); color: var(--danger); }
.inline-alert--success { background: var(--success-bg); color: var(--success); }
.inline-alert--info { background: var(--info-bg); color: var(--info); }

/* ====================== Skeleton (anti-FOUC) ====================== */
.skeleton {
  background: linear-gradient(90deg, var(--surface-2) 25%, var(--border) 37%, var(--surface-2) 63%);
  background-size: 400% 100%;
  border-radius: var(--radius-sm);
  animation: skel 1.4s ease infinite;
}
@keyframes skel { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
@media (prefers-reduced-motion: reduce) { .skeleton { animation: none; } }