/*
 * PEI Platform — Komponenty: przyciski, karty, formularze, tabele, paginacja, tagi, drzewo
 * Sygnatury: WN-25 (WCAG 2.1 AA), WN-28 (intuicyjność)
 */

/* ============================================================
   PRZYCISKI
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  font-family: var(--font-base);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  line-height: 1.25;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast);
  min-height: 2.75rem; /* 44px — WCAG 2.5.5 minimum target size */
  min-width: 5rem;
  white-space: nowrap;
  user-select: none;
}

.btn:focus-visible {
  outline: 3px solid var(--color-border-focus);
  outline-offset: 2px;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary */
.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}
.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-text-inverse);
  text-decoration: none;
}

/* Secondary */
.btn--secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--secondary:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  text-decoration: none;
}

/* Ghost */
.btn--ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}
.btn--ghost:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}

/* Danger */
.btn--danger {
  background-color: var(--color-error);
  color: var(--color-text-inverse);
  border-color: var(--color-error);
}
.btn--danger:hover {
  background-color: #9b1c21;
  border-color: #9b1c21;
  color: var(--color-text-inverse);
}

/* Rozmiary */
.btn--sm {
  font-size: var(--text-sm);
  padding: var(--space-1) var(--space-3);
  min-height: 2.25rem;
  min-width: 3rem;
}

.btn--lg {
  font-size: var(--text-lg);
  padding: var(--space-3) var(--space-8);
  min-height: 3.25rem;
}

.btn--full {
  width: 100%;
}

.btn__icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

/* ============================================================
   KARTY (article)
   ============================================================ */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card__header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.card__icon {
  width: 2.5rem;
  height: 2.5rem;
  flex-shrink: 0;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  line-height: var(--leading-tight);
  flex: 1;
}

.card__body {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.card__stat {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-1);
}

.card__stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--font-medium);
}

.card__footer {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* Karta kursu */
.course-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-normal);
}

.course-card:hover {
  box-shadow: var(--shadow-md);
}

.course-card__image {
  height: 8rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
}

.course-card__body {
  padding: var(--space-4);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.course-card__title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-2);
}

.course-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  flex: 1;
  margin-bottom: var(--space-3);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.course-card__footer {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-divider);
  background: var(--color-bg);
}

/* ============================================================
   TAGI / BADGES
   ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  line-height: 1;
  white-space: nowrap;
}

.badge--primary  { background: var(--color-primary-light); color: var(--color-primary-dark); }
.badge--success  { background: var(--color-success-light); color: #065f46; }
.badge--warning  { background: var(--color-warning-light); color: #92400e; }
.badge--error    { background: var(--color-error-light);   color: #991b1b; }
.badge--neutral  { background: var(--color-divider);        color: var(--color-text-secondary); }

/* ============================================================
   SIATKA KAFLI
   ============================================================ */

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

/* ============================================================
   SIATKA KURSÓW
   ============================================================ */

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: var(--space-6);
}

@media (max-width: 480px) {
  .course-grid {
    grid-template-columns: 1fr;
  }

  .tile-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
  }
}

/* ============================================================
   FORMULARZ LOGOWANIA
   ============================================================ */

.login-page {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr;
  background: var(--color-bg);
}

@media (min-width: 1024px) {
  .login-page {
    grid-template-columns: 1fr 1fr;
  }
}

.login-form-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-12) var(--space-8);
  background: var(--color-surface);
}

.login-form-panel__inner {
  max-width: 26rem;
  width: 100%;
  margin: 0 auto;
}

.login-info-panel {
  display: none;
  background: linear-gradient(160deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-inverse);
  padding: var(--space-12) var(--space-8);
  flex-direction: column;
  justify-content: center;
}

@media (min-width: 1024px) {
  .login-info-panel {
    display: flex;
  }
}

.login-info-panel__inner {
  max-width: 28rem;
}

.login-info-panel__title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-4);
  line-height: var(--leading-tight);
}

.login-info-panel__desc {
  font-size: var(--text-base);
  color: rgb(255 255 255 / 0.85);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-8);
}

.login-info-panel__features {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.login-info-panel__features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: rgb(255 255 255 / 0.9);
}

.login-info-panel__features li svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.login-divider {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: var(--space-5) 0;
}

.login-divider__line {
  flex: 1;
  height: 1px;
  background: var(--color-divider);
}

.login-divider__text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.login-help-link {
  display: block;
  text-align: center;
  margin-top: var(--space-4);
  font-size: var(--text-sm);
}

/* ============================================================
   DRZEWO KATEGORII (aria-tree)
   ============================================================ */

.tree {
  list-style: none;
  padding: 0;
  font-size: var(--text-sm);
}

.tree [role="treeitem"] {
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  min-height: 2.25rem;
  user-select: none;
}

.tree [role="treeitem"]:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.tree [role="treeitem"][aria-selected="true"] {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: var(--font-semibold);
}

.tree [role="treeitem"]:focus-visible {
  outline: 3px solid var(--color-border-focus);
  outline-offset: -2px;
}

.tree__expand-btn {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1rem;
  height: 1rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.tree__group {
  list-style: none;
  padding-left: var(--space-6);
}

/* ============================================================
   TABELA DOKUMENTÓW
   ============================================================ */

.data-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-divider);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.data-table {
  width: 100%;
  min-width: 36rem;
}

.data-table th {
  background: var(--color-primary-light);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary-dark);
  white-space: nowrap;
}

.data-table th button {
  background: none;
  border: none;
  font: inherit;
  color: inherit;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--font-semibold);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0;
}

.data-table th button:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:focus-within {
  background: var(--color-primary-light);
}

/* ============================================================
   PANEL METADANYCH
   ============================================================ */

.metadata-panel {
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
}

.metadata-panel__title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.metadata-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.metadata-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.metadata-item__label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.metadata-item__value {
  font-size: var(--text-sm);
  color: var(--color-text);
}

.metadata-item__value--tag {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

/* ============================================================
   PAGINACJA
   ============================================================ */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  margin-top: var(--space-8);
  flex-wrap: wrap;
}

.pagination__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  font-family: var(--font-base);
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast);
  text-decoration: none;
}

.pagination__btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}

.pagination__btn[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
  font-weight: var(--font-bold);
}

.pagination__btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination__btn:focus-visible {
  outline: 3px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* ============================================================
   FILTRY (sidebar katalogu)
   ============================================================ */

.filter-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
}

.filter-panel__title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.filter-group {
  margin-bottom: var(--space-5);
}

.filter-group__label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
  display: block;
}

.filter-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  min-height: 2rem;
}

.filter-option:hover {
  background: var(--color-primary-light);
}

.filter-option label {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: var(--font-normal);
  cursor: pointer;
  margin: 0;
  flex: 1;
}

.filter-option input {
  min-height: auto;
  width: auto;
}

/* ============================================================
   POWIADOMIENIA / ALERT
   ============================================================ */

.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  margin-bottom: var(--space-4);
}

.alert--info    { background: var(--color-primary-light); color: var(--color-primary-dark); border: 1px solid #bfdbfe; }
.alert--success { background: var(--color-success-light); color: #065f46;                   border: 1px solid #a7f3d0; }
.alert--warning { background: var(--color-warning-light); color: #92400e;                   border: 1px solid #fde68a; }
.alert--error   { background: var(--color-error-light);   color: #991b1b;                   border: 1px solid #fecaca; }

.alert__icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ============================================================
   BREADCRUMB
   ============================================================ */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  list-style: none;
  padding: 0;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--color-text-disabled);
  margin-right: var(--space-2);
}

.breadcrumb a {
  color: var(--color-primary);
}

.breadcrumb [aria-current="page"] {
  color: var(--color-text);
  font-weight: var(--font-medium);
}

/* ============================================================
   SEKCJA REKOMENDACJI
   ============================================================ */

.recommendations-section {
  margin-top: var(--space-8);
}

.recommendations-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.recommendations-section__title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.recommendations-section__subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.ai-placeholder {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  background: var(--color-warning-light);
  border: 1px dashed var(--color-warning);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-4);
}

/* ============================================================
   FORMULARZ — grupy pól
   ============================================================ */

.form-group {
  margin-bottom: var(--space-5);
}

.form-group label {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ============================================================
   RESPONSYWNOŚĆ KOMPONENTÓW
   ============================================================ */

@media (max-width: 767px) {
  .card {
    padding: var(--space-4);
  }

  .login-form-panel {
    padding: var(--space-8) var(--space-4);
  }

  .tile-grid {
    grid-template-columns: 1fr 1fr;
  }

  .filter-panel {
    position: static;
  }

  .metadata-panel {
    position: static;
  }
}

@media (max-width: 480px) {
  .tile-grid {
    grid-template-columns: 1fr;
  }

  .btn--lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
  }
}