/* ==============================================================================
   Francês Adaptativo — Responsividade
   Navegação superior única em todos os tamanhos de tela: no desktop ela ocupa
   a largura do conteúdo; no mobile vira uma trilha horizontal deslizável,
   mantendo exatamente a mesma hierarquia e os mesmos rótulos.
   ============================================================================== */

/* Alvos de toque confortáveis (WCAG 2.5.5 / Apple HIG) */
button,
.btn,
.nav-item,
.chip,
.card-interactive,
.icon-btn,
.theme-toggle-btn {
  min-height: 44px;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.btn-sm,
.chip,
.nav-item,
.speed-btn,
.srs-filter-chip,
.conv-correction-tab {
  min-height: 38px;
}

/* Safe area (iOS) */
#topbar { padding-top: env(safe-area-inset-top, 0px); }

#app-content {
  padding-bottom: calc(var(--space-8) + env(safe-area-inset-bottom, 0px));
}

/* --- Laptop / tablet grande --- */
@media (max-width: 1024px) {
  :root {
    --topbar-height: 62px;
    --navrail-height: 50px;
  }

  #app-content { padding: var(--space-5) var(--space-4) var(--space-7); }
  .topbar-row,
  .nav-rail-inner { padding: 0 var(--space-4); }
  .brand-sub { display: none; }
  .study-media-iframe { height: 320px; }
}

/* --- Tablet --- */
@media (max-width: 880px) {
  .topbar-meta .user-status-pill { display: none; }
  .avatar-btn .user-name { display: none; }
  .avatar-btn { padding: 0.3rem; }
  .api-status { display: none; }

  .conv-metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .srs-card-face { padding: var(--space-5) var(--space-4); }
}

/* --- Mobile --- */
@media (max-width: 768px) {
  :root {
    --topbar-height: 58px;
    --navrail-height: 52px;
  }

  #app-content { padding: var(--space-4) var(--space-4) var(--space-7); }

  .topbar-row,
  .nav-rail-inner { padding: 0 var(--space-4); }

  .brand-text { display: none; }

  /* Indica que a trilha continua para o lado */
  .nav-rail {
    position: relative;
    mask-image: linear-gradient(to right, transparent 0, #000 14px, #000 calc(100% - 22px), transparent 100%);
    -webkit-mask-image: linear-gradient(to right, transparent 0, #000 14px, #000 calc(100% - 22px), transparent 100%);
  }

  .nav-item { font-size: 0.85rem; padding: 0.45rem 0.75rem; }
  .nav-divider { margin: 0 0.25rem; }

  .page-head { align-items: flex-start; gap: var(--space-3); }
  .page-head-actions { width: 100%; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 0.7rem; }
  .stat-card { padding: 0.85rem; gap: 0.75rem; }
  .stat-icon { width: 38px; height: 38px; font-size: 1.15rem; }
  .stat-value { font-size: 1.25rem; }

  .activity-item { flex-direction: column; align-items: stretch; gap: 0.7rem; }
  .activity-item .btn { width: 100%; }

  .srs-ratings-grid { grid-template-columns: repeat(2, 1fr); }
  .conv-theme-grid { grid-template-columns: repeat(2, 1fr); }
  .study-media-iframe { height: 230px; }
  .study-step-label { display: none; }

  #toast-container {
    bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
    left: var(--space-4);
    right: var(--space-4);
  }

  .toast { min-width: 0; max-width: 100%; }

  .shadow-gym-card {
    flex-direction: column;
    align-items: stretch;
  }

  .shadow-gym-actions .btn {
    width: 100%;
  }

  .shadow-tabs {
    width: 100%;
  }

  .shadow-lib-filters {
    width: 100%;
  }

  .shadow-lib-chip {
    flex: 1 1 auto;
    justify-content: center;
  }

  .shadow-tab {
    flex: 1 1 auto;
    justify-content: center;
    font-size: 0.78rem;
    padding: 0.55rem 0.45rem;
  }

  .shadow-ai-textarea {
    font-size: 1rem;
  }

  .phrase-shadow-btn,
  .phrase-audio-btn {
    min-width: 2.75rem;
    min-height: 2.75rem;
  }

  .shadow-playback-bar {
    gap: 0.75rem;
  }
}

/* --- Ilhas curadas (Aprenda o Básico + Comer Fora e Compras) --- */
@media (max-width: 768px) {
  .curated-island-card {
    padding: 1.1rem 1.2rem;
    gap: 0.75rem;
  }

  .curated-island-card-desc {
    font-size: 0.85rem;
    line-height: 1.4;
  }

  .curated-island-card-icon {
    font-size: 1.6rem;
  }

  .topic-card {
    padding: 0.85rem 1rem;
    gap: 0.75rem;
  }

  .topic-card-title {
    white-space: normal;
    line-height: 1.3;
  }

  .topic-card-icon {
    font-size: 1.45rem;
    width: 2rem;
  }

  .dialog-line-speaker {
    flex-shrink: 0;
  }

  .phrase-mode-row {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .phrase-session-status {
    width: 100%;
  }
}

/* --- Mobile grande (iPhone Plus / Pro Max) --- */
@media (max-width: 430px) {
  #app-content { padding: var(--space-4) 0.85rem var(--space-6); }

  .stats-grid { grid-template-columns: 1fr; }
  .streak-pill { padding: 0.3rem 0.6rem; font-size: 0.78rem; }
  .card { padding: var(--space-4); }
  .conv-setup-card { padding: var(--space-4); }
  .srs-flip-wrapper, .srs-flip-card, .srs-card-face { min-height: 360px; }
}

/* --- Mobile padrão --- */
@media (max-width: 390px) {
  .conv-metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .phoneme-grid { grid-template-columns: 1fr !important; }
  .btn-lg { padding: 0.7rem 1.15rem; font-size: 0.95rem; }
  .page-head-actions .btn { width: 100%; }
}

/* --- Compacto (iPhone SE) --- */
@media (max-width: 320px) {
  html { font-size: 15px; }
  .topbar-row, .nav-rail-inner { padding: 0 0.65rem; }
  #app-content { padding: 0.75rem 0.65rem var(--space-6); }
  .srs-ratings-grid { grid-template-columns: 1fr; }
}

/* --- Telas largas: mais respiro lateral --- */
@media (min-width: 1400px) {
  :root { --content-max: 1180px; }
}

/* --- Impressão --- */
@media print {
  #topbar, #toast-container { display: none !important; }
  body::before { display: none; }
  #app-content { max-width: none; padding: 0; }
  .card { box-shadow: none; border-color: #ccc; }
}