/*
 * Vasco IA Suporte - Materiais com Abas Interativas
 *
 * Estilos para a nova UI de materiais por abas (M3/T8).
 * Substitui o card simples do LessonMaterials (iframe PDF) por uma
 * experiencia de abas: Resumo, Topicos, Tags, FAQ + botao PDF.
 *
 * Markup alvo: vasco-materials-tabs + BEM vasco-materials-tabs__*
 *
 * Paleta dark (alinhada ao chat widget D-017):
 *  - bg raiz:    #14171c
 *  - bg elevado: #1a1f27
 *  - bg card:    #1f242c
 *  - borda:      #232830
 *  - borda card: #2c3441
 *  - accent:     #00f0ff (cyan)
 *  - texto prim: #e8eaed
 *  - texto sec:  #c9ccd1
 *  - texto mute: #9aa0a6
 *
 * Font-family: stack system identica ao LessonMaterials.php
 *
 * Comentarios em PT sem acentos (convencao do projeto).
 */

/* ============================================================
 * Container raiz
 * ============================================================ */
.vasco-materials-tabs {
  background: #14171c;
  border: 1px solid #232830;
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  color: #e8eaed;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  box-sizing: border-box;
}

.vasco-materials-tabs *,
.vasco-materials-tabs *::before,
.vasco-materials-tabs *::after {
  box-sizing: inherit;
}

/* ============================================================
 * Header (titulo + botao PDF)
 * ============================================================ */
.vasco-materials-tabs__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.vasco-materials-tabs__title {
  margin: 0 !important;
  font-size: 1.15rem !important;
  font-weight: 600 !important;
  color: #e8eaed !important;
  line-height: 1.3 !important;
}

/* ============================================================
 * Botao PDF
 * ============================================================ */
.vasco-materials-tabs__pdf-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: linear-gradient(135deg, #00f0ff 0%, #00bfff 100%);
  color: #0a0d12 !important;
  border-radius: 8px;
  text-decoration: none !important;
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.vasco-materials-tabs__pdf-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 240, 255, 0.3);
  color: #0a0d12 !important;
  text-decoration: none !important;
}

.vasco-materials-tabs__pdf-button:active {
  transform: translateY(0);
  box-shadow: none;
}

/* Icone SVG dentro do botao */
.vasco-materials-tabs__pdf-button svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  fill: currentColor;
}

/* ============================================================
 * Nav (tablist)
 * ============================================================ */
.vasco-materials-tabs__nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: #232830 transparent;
  border-bottom: 1px solid #232830;
  margin-bottom: 0;
  position: relative;
  /* Esconde barra de scroll no WebKit */
}

.vasco-materials-tabs__nav::-webkit-scrollbar {
  height: 3px;
}

.vasco-materials-tabs__nav::-webkit-scrollbar-track {
  background: transparent;
}

.vasco-materials-tabs__nav::-webkit-scrollbar-thumb {
  background: #232830;
  border-radius: 2px;
}

/* Fade gradient para indicar overflow horizontal (MAT-04.2) */
.vasco-materials-tabs__nav::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 30px;
  background: linear-gradient(to right, transparent, #14171c);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

/* JS (T9) adiciona .is-overflowing quando a nav transborda */
.vasco-materials-tabs__nav.is-overflowing::after {
  opacity: 1;
}

/* ============================================================
 * Abas individuais
 * ============================================================ */
.vasco-materials-tabs__tab {
  padding: 0.6rem 1rem;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  /* Compensar a borda do nav para as abas assentarem na linha */
  margin-bottom: -1px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: #9aa0a6;
  white-space: nowrap;
  transition: color 0.15s ease, border-bottom-color 0.15s ease;
  font-family: inherit;
  line-height: 1.4;
}

.vasco-materials-tabs__tab:hover {
  color: #e8eaed;
}

/* Aba ativa: via atributo ARIA ou classe helper do JS */
.vasco-materials-tabs__tab[aria-selected="true"],
.vasco-materials-tabs__tab.is-active {
  color: #00f0ff;
  border-bottom-color: #00f0ff;
}

.vasco-materials-tabs__tab:focus-visible {
  outline: 2px solid #00f0ff;
  outline-offset: 2px;
  border-radius: 4px 4px 0 0;
}

/* ============================================================
 * Paineis de conteudo
 * ============================================================ */
.vasco-materials-tabs__panels {
  /* Sem padding lateral extra — paineis herdam do container */
}

.vasco-materials-tabs__panel {
  padding: 1.25rem 0;
}

/* Garante ocultacao mesmo que reset de tema force display:block em [hidden] */
.vasco-materials-tabs__panel[hidden] {
  display: none !important;
}

/* ============================================================
 * Painel: Resumo
 * Paragrafo puro — herda estilos do container
 * ============================================================ */
.vasco-materials-tabs__panel p {
  margin: 0 0 0.75rem;
  color: #c9ccd1;
}

.vasco-materials-tabs__panel p:last-child {
  margin-bottom: 0;
}

/* ============================================================
 * Painel: Topicos
 * ============================================================ */
.vasco-materials-tabs__topic {
  margin-bottom: 1.25rem;
}

.vasco-materials-tabs__topic:last-child {
  margin-bottom: 0;
}

.vasco-materials-tabs__topic h4 {
  color: #00f0ff;
  margin: 0 0 0.5rem !important;
  font-size: 1rem !important;
  font-weight: 600;
  line-height: 1.3;
}

.vasco-materials-tabs__topic ul {
  margin: 0 !important;
  padding-left: 1.25rem !important;
  list-style: disc !important;
  color: #c9ccd1;
}

.vasco-materials-tabs__topic li {
  margin-bottom: 0.25rem;
  line-height: 1.5;
}

/* ============================================================
 * Painel: Tags (chips)
 * Chips sao spans — nao-clicaveis (decisao Q1 do discuss)
 * ============================================================ */
.vasco-materials-tabs__chip {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  margin: 0.25rem 0.4rem 0.25rem 0;
  background: #1f242c;
  border: 1px solid #2c3441;
  border-radius: 999px;
  font-size: 0.85rem;
  color: #c9ccd1;
  /* Sem cursor pointer nem hover — nao e clicavel */
}

/* ============================================================
 * Painel: FAQ com <details>
 * ============================================================ */
.vasco-materials-tabs__faq-item {
  margin-bottom: 0.5rem;
}

.vasco-materials-tabs__faq-item:last-child {
  margin-bottom: 0;
}

.vasco-materials-tabs__faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 0.75rem 1rem;
  background: #1a1f27;
  border-radius: 8px;
  color: #e8eaed;
  font-weight: 500;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  transition: background 0.15s ease;
  /* Remove marcador nativo no Firefox/Chrome */
  -webkit-user-select: none;
  user-select: none;
}

/* Remove triangulo nativo WebKit */
.vasco-materials-tabs__faq-item summary::-webkit-details-marker {
  display: none;
}

/* Chevron via pseudo-elemento */
.vasco-materials-tabs__faq-item summary::after {
  content: '\25BE'; /* ▾ */
  font-size: 1rem;
  color: #9aa0a6;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.vasco-materials-tabs__faq-item[open] summary {
  border-radius: 8px 8px 0 0;
}

.vasco-materials-tabs__faq-item[open] summary::after {
  transform: rotate(180deg);
}

.vasco-materials-tabs__faq-item summary:hover {
  background: #1f242c;
}

.vasco-materials-tabs__faq-item summary:focus-visible {
  outline: 2px solid #00f0ff;
  outline-offset: 2px;
}

.vasco-materials-tabs__faq-answer {
  padding: 0.75rem 1rem 1rem;
  background: #1a1f27;
  border-radius: 0 0 8px 8px;
  border-top: 1px solid #232830;
  color: #c9ccd1;
  line-height: 1.6;
  font-size: 0.95rem;
}

/* ============================================================
 * Aba: tab escondida quando vazia (is-empty)
 * Aplicado ao botao de tab (ex: aba Links antes do fetch resolver)
 * ============================================================ */
.vasco-materials-tabs__tab.is-empty {
  display: none;
}

/* ============================================================
 * Painel Links — lista de cards
 * ============================================================ */
.vasco-materials-tabs__links-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Card de link referenciado */
.vasco-materials-tabs__link-card {
  background: #1a1f27;
  border: 1px solid #2c3441;
  border-radius: 8px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.vasco-materials-tabs__link-card-title {
  margin: 0 !important;
  font-size: 0.95rem !important;
  font-weight: 600 !important;
  color: #e8eaed !important;
  line-height: 1.4 !important;
  /* Trunca titulos muito longos */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.vasco-materials-tabs__link-card-snippet {
  margin: 0 !important;
  font-size: 0.875rem;
  color: #9aa0a6;
  line-height: 1.5;
  /* Limita a 3 linhas */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Botao "Abrir →" */
.vasco-materials-tabs__link-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: 0.25rem;
  padding: 0.4rem 0.85rem;
  background: transparent;
  border: 1px solid #00f0ff;
  border-radius: 6px;
  color: #00f0ff !important;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none !important;
  align-self: flex-start;
  transition: background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.vasco-materials-tabs__link-cta:hover {
  background: rgba(0, 240, 255, 0.1);
  color: #00f0ff !important;
  text-decoration: none !important;
}

.vasco-materials-tabs__link-cta:focus-visible {
  outline: 2px solid #00f0ff;
  outline-offset: 2px;
}

/* ============================================================
 * Skeleton shimmer (exibido durante o fetch dos links)
 * ============================================================ */
.vasco-materials-tabs__links-skeleton {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.vasco-materials-tabs__skeleton-card {
  height: 88px;
  background: linear-gradient(
    90deg,
    #1a1f27 25%,
    #232830 50%,
    #1a1f27 75%
  );
  background-size: 200% 100%;
  border-radius: 8px;
  animation: vasco-shimmer 1.4s infinite linear;
  border: 1px solid #2c3441;
}

@keyframes vasco-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================================
 * Mensagem de erro no painel links
 * ============================================================ */
.vasco-materials-tabs__error {
  margin: 0 !important;
  padding: 0.75rem 1rem;
  background: #1a1f27;
  border: 1px solid #2c3441;
  border-radius: 8px;
  color: #9aa0a6;
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ============================================================
 * Variante fallback (sem blocos JSON, apenas PDF)
 * Nav e paineis nao estarao no DOM — CSS ja cobre por omissao
 * ============================================================ */
.vasco-materials-tabs--fallback .vasco-materials-tabs__header {
  margin-bottom: 0;
}

/* ============================================================
 * Mobile — breakpoint 767px
 * ============================================================ */
@media (max-width: 767px) {
  .vasco-materials-tabs {
    padding: 1rem;
  }

  .vasco-materials-tabs__title {
    font-size: 1rem !important;
  }

  .vasco-materials-tabs__panel {
    font-size: 14px;
  }

  .vasco-materials-tabs__faq-item summary {
    padding: 0.6rem 0.75rem;
    font-size: 0.9rem;
  }

  .vasco-materials-tabs__faq-answer {
    padding: 0.6rem 0.75rem 0.85rem;
    font-size: 0.875rem;
  }

  .vasco-materials-tabs__tab {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
  }
}