/* IA Tutor: fluxo de desafios em telas pequenas. Não altera apostila ou exemplos. */
.mobile-nav-backdrop,
.mobile-sidebar-close,
.mobile-current-exercise,
.mobile-code-tools { display: none; }
.mode-tab { background: transparent; text-align: left; }
.mode-tab:focus-visible,
.exercise-tab:focus-visible,
.mobile-sidebar-close:focus-visible,
.mobile-code-tools button:focus-visible,
#btn-toggle-sidebar:focus-visible {
  outline: 3px solid #0284c7;
  outline-offset: 3px;
}
.metrics-disclosure {
  margin-top: 8px;
  border: 1px solid #e2e8f0;
  border-radius: 14px;
  background: #fff;
}
.metrics-disclosure > summary {
  cursor: pointer;
  list-style-position: inside;
  padding: 16px 18px;
  color: #334155;
  font-size: 14px;
  font-weight: 700;
}
.metrics-disclosure > summary span { display: inline-block; margin-left: 8px; color: #64748b; font-size: 12px; font-weight: 500; }
.metrics-disclosure .metrics-grid { padding: 0 16px 16px; }
.metrics-disclosure:focus-within { border-color: #38bdf8; }
#execution-results { scroll-margin-top: 16px; }
#problem-title { scroll-margin-top: 14px; }
#alert-toast { max-width: min(420px, calc(100vw - 28px)); overflow-wrap: anywhere; }

@media (max-width: 1023px) {
  .app-layout .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    display: flex;
    visibility: hidden;
    pointer-events: none;
    width: min(360px, 88vw);
    max-width: 88vw;
    min-width: 0;
    height: 100dvh;
    z-index: 70;
    transform: translateX(-105%);
    overflow-y: auto;
    overscroll-behavior: contain;
    border-right: 1px solid #cbd5e1;
    border-bottom: 0;
    background: #f8fafc;
    box-shadow: 20px 0 50px rgba(15,23,42,.15);
    opacity: 1;
    transition: transform .22s ease, visibility .22s;
  }
  .app-layout .sidebar.mobile-open {
    visibility: visible;
    pointer-events: auto;
    transform: translateX(0);
  }
  .app-layout .sidebar.collapsed { height: 100dvh !important; }
  .mobile-sidebar-close {
    display: inline-flex;
    align-self: flex-end;
    align-items: center;
    gap: 10px;
    min-height: 44px;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    padding: 8px 13px;
    background: #fff;
    color: #0f172a;
    font-size: 14px;
    font-weight: 700;
  }
  .mobile-sidebar-close span { font-size: 23px; line-height: 1; }
  .mobile-nav-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 60;
    background: rgba(15, 23, 42, .56);
  }
  body.mobile-nav-open { overflow: hidden; }
  body.mobile-nav-open .mobile-nav-backdrop { display: block; }
  .main-workspace { min-width: 0; max-width: 100%; padding: 20px 22px 34px; gap: 19px; }
  .workspace-meta .badge-tag { display: none; }
  #btn-toggle-sidebar { min-height: 44px; padding: 9px 12px; gap: 7px; font-size: 13px; font-weight: 700; }
  .mobile-nav-label { display: inline; }
  .mobile-current-exercise {
    display: block;
    margin: -4px 0 0;
    padding: 9px 13px;
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    color: #075985;
    font-size: 13px;
    font-weight: 700;
    border-radius: 12px;
    line-height: 1.5;
  }
  .exercise-tab-bar { overflow-x: auto; max-width: 100%; gap: 20px; scrollbar-width: thin; scroll-snap-type: x proximity; }
  .exercise-tab-bar > .exercise-tab { flex: 0 0 auto; min-height: 44px; white-space: nowrap; scroll-snap-align: start; }
  .problem-card { min-width: 0; }
  .mode-selector { gap: 12px; flex-wrap: wrap; align-items: center; }
  .mode-selector > .mode-tab { min-height: 44px; flex: 1 1 200px; padding: 8px 0; font-size: 13px; }
  .code-editor-wrapper { min-width: 0; max-width: 100%; }
  .code-editor-wrapper .CodeMirror {
    font-size: 16px;
    height: clamp(255px, 44dvh, 390px);
    min-height: 255px;
    line-height: 1.55;
  }
  .code-editor-wrapper .CodeMirror-scroll { min-height: 255px; }
  .code-editor-wrapper .CodeMirror-gutters { min-width: 24px; }
  .action-row > .feature-tip { display: none; }
  #panel-code .action-row, #panel-desc .action-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 10px;
    align-items: stretch;
  }
  #btn-submit-code, #btn-submit-desc { grid-column: 1 / -1; width: 100%; min-height: 50px; }
  #btn-submit-code > span:last-child, #btn-submit-desc > span:last-child { width: 100%; min-height: 50px; }
  #btn-submit-code .relative.z-10, #btn-submit-desc .relative.z-10 { letter-spacing: .02em; font-size: 13px; }
  #btn-hint-code, #btn-hint-desc, #btn-ask-tutor-code, #btn-ask-tutor-desc {
    width: 100%; min-width: 0; min-height: 48px;
    padding: 10px 8px; font-size: 11px; letter-spacing: 0; line-height: 1.4;
    white-space: normal;
  }
  .action-row > span.ml-auto { grid-column: 1 / -1; margin: 0; }
  .accordion-content input, .accordion-content button { min-height: 44px; }
  .accordion-content input, #textarea-desc { font-size: 16px; }
  .mobile-code-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
  .mobile-code-tools button {
    border: 1px solid #94a3b8;
    border-radius: 10px;
    color: #0f172a;
    background: #f8fafc;
    min-height: 44px;
    padding: 9px 13px;
    font-size: 13px;
    font-weight: 700;
  }
  .mobile-code-tools > span { flex: 1 1 160px; color: #64748b; font-size: 12px; line-height: 1.5; }
  .metrics-disclosure > summary span { display: block; margin-left: 24px; padding-top: 4px; }
  .test-item { align-items: flex-start; gap: 10px; padding: 12px; }
  .test-badge { flex-shrink: 0; }
  .test-case-values { gap: 6px; }
  #alert-toast { bottom: max(12px, env(safe-area-inset-bottom)); left: 14px; right: 14px; width: auto; }
  .main-workspace .flashlight-card:hover { transform: none; }
}
@media (max-width: 480px) {
  .main-workspace { padding: 14px 14px 26px; gap: 15px; }
  .workspace-header { gap: 9px; flex-wrap: wrap; }
  .workspace-header > div:first-child { min-width: 0; flex-wrap: wrap; gap: 8px; }
  .workspace-header .font-heading { font-size: 15px; }
  .workspace-meta { margin-left: auto; }
  .workspace-meta .feature-tour-launch { min-height: 44px; }
  .problem-card { padding: 17px; }
  .problem-card #problem-title { font-size: 19px; line-height: 1.3; }
  .constraints-expander .expander-content { padding: 12px; }
  .accordion-content { padding: 14px; }
  #execution-results .execution-feedback-disclosure { min-width: 0; }
  .test-item { flex-direction: column; }
  .test-badge { align-self: flex-start; }
  .metrics-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .metrics-grid .flashlight-card { height: auto; min-height: 120px; padding: 12px; }
  .metrics-grid .metric-value { font-size: 23px; }
  #chat-history-details { padding: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  .app-layout .sidebar { transition: none; }
  .exercise-tab-bar { scroll-behavior: auto; }
}