/* ==========================================================================
   components.css — componentes reutilizáveis (header, cards, código,
   callouts, tabelas, diagramas de lista, botões, badges)
   ========================================================================== */

/* ---------- Header / navegação do site ---------- */

.site-header {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
  padding: var(--space-6) 0 var(--space-7);
  position: relative;
  overflow: hidden;
}

.site-header::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 88% 18%, rgba(242, 183, 5, 0.16), transparent 42%),
    radial-gradient(circle at 6% 82%, rgba(255, 255, 255, 0.08), transparent 38%);
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  z-index: 1;
}

.site-header__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  margin-bottom: var(--space-4);
}

.site-header__title {
  color: #fff;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.site-header__title .prompt {
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.site-header__subtitle {
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.1rem;
  max-width: 46em;
  margin-bottom: 0;
}

.top-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.top-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) 0;
}

.top-nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
}

.top-nav__brand:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.top-nav__brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.top-nav__crumbs {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.92rem;
  color: var(--color-text-muted);
  min-width: 0;
  flex-shrink: 1;
}

.top-nav__crumbs a {
  flex-shrink: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.top-nav__crumbs .sep {
  color: var(--color-text-faint);
  flex-shrink: 0;
}

.top-nav__crumbs .current {
  color: var(--color-text);
  font-weight: 600;
  flex-shrink: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Em telas estreitas, mostramos só a etapa atual da navegação — o logo
   já leva de volta ao início, então não é preciso repetir todo o trajeto. */
@media (max-width: 640px) {
  .top-nav__crumbs a,
  .top-nav__crumbs .sep {
    display: none;
  }

  .top-nav__crumbs .current {
    max-width: 40vw;
  }
}

.top-nav__actions {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ---------- Botões ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
  line-height: 1.2;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
}

.btn--accent {
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  box-shadow: var(--shadow-sm);
}

.btn--accent:hover {
  background: var(--color-accent-dark);
  box-shadow: var(--shadow-md);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

.btn--ghost:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-text-faint);
}

.btn--sm {
  padding: var(--space-2) var(--space-3);
  font-size: 0.85rem;
}

.btn--block {
  width: 100%;
  justify-content: center;
}

.btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn-icon:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.btn-icon:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ---------- Cards de módulo ---------- */

.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}

.module-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
  position: relative;
}

.module-card:hover,
.module-card:focus-within {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--color-primary);
}

.module-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.module-card__number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
}

.module-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  flex-shrink: 0;
}

.module-card__title {
  font-size: 1.2rem;
  margin-bottom: 0;
}

.module-card__desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 0;
  flex-grow: 1;
}

.module-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.78rem;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  white-space: nowrap;
}

.badge--available {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge--soon {
  background: var(--color-bg-alt);
  color: var(--color-text-faint);
}

.module-card--placeholder {
  opacity: 0.65;
}

.module-card--placeholder .module-card__icon {
  background: var(--color-bg-alt);
  color: var(--color-text-faint);
}

/* ---------- Bloco de código ---------- */

.code-block {
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: var(--space-5) 0;
  box-shadow: var(--shadow-sm);
}

.code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background: var(--color-code-bg-alt);
  border-bottom: 1px solid var(--color-code-border);
}

.code-block__lang {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-code-comment);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.code-block__lang::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-accent);
  display: inline-block;
}

.code-block__copy {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  background: transparent;
  border: 1px solid var(--color-code-border);
  color: var(--color-code-comment);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.code-block__copy:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-code-text);
  border-color: var(--color-code-text);
}

.code-block__copy.is-copied {
  color: var(--color-success);
  border-color: var(--color-success);
}

.code-block pre {
  margin: 0;
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--color-code-text);
}

.code-block figcaption {
  padding: var(--space-2) var(--space-5);
  font-size: 0.85rem;
  color: var(--color-code-comment);
  border-top: 1px solid var(--color-code-border);
  background: var(--color-code-bg-alt);
}

/* Tokens de syntax highlighting (ver highlight.js) */
.tok-kw { color: var(--color-code-keyword); font-weight: 600; }
.tok-str { color: var(--color-code-string); }
.tok-num { color: var(--color-code-number); }
.tok-fn { color: var(--color-code-function); }
.tok-builtin { color: var(--color-code-builtin); }
.tok-com { color: var(--color-code-comment); font-style: italic; }
.tok-op { color: var(--color-code-operator); }

.code-inline {
  font-family: var(--font-mono);
}

/* ---------- Saída de terminal (input/output) ---------- */

.io-block {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-5) 0;
}

@media (min-width: 640px) {
  .io-block--pair {
    grid-template-columns: 1fr 1fr;
  }
}

.io-panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.io-panel__label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.io-panel__body {
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background: var(--color-surface);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---------- Callouts didáticos ---------- */

.callout {
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-5) 0;
  border: 1px solid transparent;
  border-left-width: 4px;
  display: flex;
  gap: var(--space-3);
}

.callout__icon {
  font-size: 1.3rem;
  line-height: 1;
  flex-shrink: 0;
}

.callout__body {
  min-width: 0;
}

.callout__title {
  font-weight: 700;
  margin-bottom: var(--space-1);
  display: block;
}

.callout__body p:last-child {
  margin-bottom: 0;
}

.callout--info {
  background: var(--color-info-bg);
  border-color: var(--color-info);
  color: var(--color-text);
}
.callout--info .callout__title { color: var(--color-info); }

.callout--warning {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
}
.callout--warning .callout__title { color: var(--color-warning); }

.callout--tip {
  background: var(--color-tip-bg);
  border-color: var(--color-tip);
}
.callout--tip .callout__title { color: var(--color-tip); }

.callout--example {
  background: var(--color-success-bg);
  border-color: var(--color-success);
}
.callout--example .callout__title { color: var(--color-success); }

/* ---------- Tabelas ---------- */

.data-table-wrap {
  overflow-x: auto;
  margin: var(--space-5) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.data-table th {
  background: var(--color-bg-alt);
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
}

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

.data-table td code {
  white-space: nowrap;
}

/* ---------- Diagrama visual de lista (índices/valores) ---------- */

.list-diagram {
  margin: var(--space-5) 0;
  overflow-x: auto;
  padding-bottom: var(--space-2);
}

.list-diagram__row {
  display: inline-flex;
  gap: 3px;
}

.list-diagram__cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 56px;
}

.list-diagram__index-pos,
.list-diagram__index-neg {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-faint);
  padding: 2px 0;
  height: 1.3em;
}

.list-diagram__index-pos { color: var(--color-primary); }
.list-diagram__index-neg { color: var(--color-tip); }

.list-diagram__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  background: var(--color-surface);
  border: 2px solid var(--color-border-strong);
  padding: var(--space-3) var(--space-2);
  min-width: 56px;
  text-align: center;
  color: var(--color-text);
  transition: background var(--transition-base), border-color var(--transition-base), color var(--transition-base);
}

.list-diagram__cell:first-child .list-diagram__value { border-top-left-radius: var(--radius-sm); border-bottom-left-radius: var(--radius-sm); }
.list-diagram__cell:last-child .list-diagram__value { border-top-right-radius: var(--radius-sm); border-bottom-right-radius: var(--radius-sm); }

.list-diagram__cell--highlight .list-diagram__value {
  background: var(--color-primary);
  border-color: var(--color-primary-dark);
  color: #fff;
}

.list-diagram__cell--out .list-diagram__value {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
  color: var(--color-warning);
  text-decoration: line-through;
  opacity: 0.7;
}

.list-diagram__cell--new .list-diagram__value {
  background: var(--color-success-bg);
  border-color: var(--color-success);
  color: var(--color-success);
  animation: pop-in 320ms ease;
}

.list-diagram__cell--empty .list-diagram__value {
  border-style: dashed;
  color: var(--color-text-faint);
}

@keyframes pop-in {
  from { transform: scale(0.7); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.list-diagram__caption {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

.list-diagram__legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-3);
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.list-diagram__legend-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.list-diagram__legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  border: 2px solid var(--color-border-strong);
  display: inline-block;
}

.list-diagram__legend-swatch--highlight { background: var(--color-primary); border-color: var(--color-primary-dark); }
.list-diagram__legend-swatch--new { background: var(--color-success-bg); border-color: var(--color-success); }
.list-diagram__legend-swatch--out { background: var(--color-warning-bg); border-color: var(--color-warning); }

/* ---------- Fluxo (steps) ---------- */

.flow-diagram {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-5) 0;
}

.flow-diagram__step {
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text);
}

.flow-diagram__step--action {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  font-weight: 600;
}

.flow-diagram__arrow {
  color: var(--color-text-faint);
  font-size: 1.1rem;
}

/* ---------- Fluxo de decisão (condição verdadeira/falsa) ---------- */

.decision-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-5) 0;
}

.decision-flow__condition {
  font-family: var(--font-mono);
  font-weight: 700;
  text-align: center;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-5);
}

.decision-flow__branches {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-6);
  width: 100%;
}

.decision-flow__branch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  min-width: 170px;
}

.decision-flow__branch-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-faint);
}

.decision-flow__branch--true .decision-flow__branch-label { color: var(--color-success); }
.decision-flow__branch--false .decision-flow__branch-label { color: var(--color-warning); }

.decision-flow__arrow-down {
  color: var(--color-text-faint);
  font-size: 1.1rem;
  line-height: 1;
}

.decision-flow__box {
  font-family: var(--font-mono);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  text-align: center;
}

.decision-flow__box--end {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
  color: var(--color-warning);
  font-weight: 700;
}

.decision-flow__loop {
  font-size: 0.8rem;
  color: var(--color-success);
  text-align: center;
}

/* ---------- Botão voltar ao topo ---------- */

.back-to-top {
  position: fixed;
  right: var(--space-5);
  bottom: var(--space-5);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  z-index: 200;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
}

/* ---------- Estado vazio / erro ---------- */

.empty-state {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  color: var(--color-text-muted);
}

.empty-state h2 {
  color: var(--color-text);
}

/* ---------- Rodapé ---------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  margin-top: var(--space-8);
  color: var(--color-text-faint);
  font-size: 0.88rem;
  text-align: center;
}