/* Dedicated study layer for the existing question bank. */
#studyEnvironment {
  --study-bg: #f3f5f5;
  --study-surface: #fff;
  --study-ink: #17252e;
  --study-muted: #68747b;
  --study-line: #e1e7e8;
  --study-navy: #0d2230;
  --study-gold: #d5ad62;
  min-height: 100vh;
  background: var(--study-bg);
  color: var(--study-ink);
}

/* Author display rules in the legacy shell must not override HTML hidden.
   The router controls this explicit state; no descendant/visibility inference. */
.appShell[hidden],
#studyEnvironment[hidden],
#pwaBottomNav[hidden],
#pwaMoreSheet[hidden],
#pwaInstallSheet[hidden],
#pwaHomeCard[hidden],
#sessionPerformancePanel[hidden] {
  display: none !important;
}

#studyEnvironment .studyHeader {
  position: sticky;
  top: 0;
  z-index: 100;
  display: grid;
  grid-template-columns: minmax(190px, 1fr) minmax(160px, .8fr) minmax(190px, 1fr);
  align-items: center;
  gap: 20px;
  min-height: 68px;
  padding: 9px clamp(16px, 3vw, 38px);
  background: rgba(13, 34, 48, .97);
  border-bottom: 1px solid rgba(222, 190, 126, .25);
  color: #f5f4ef;
  box-shadow: 0 4px 18px rgba(10, 26, 36, .12);
  backdrop-filter: blur(14px);
}

#studyEnvironment .studyExit {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 10px;
  min-width: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

#studyEnvironment .studyExit:hover .studyBrandName strong,
#studyEnvironment .studyExit:focus-visible .studyBrandName strong {
  color: #f0cf8a;
}

#studyEnvironment .studyExit:focus-visible,
#studyEnvironment .studyHeaderActions button:focus-visible {
  outline: 3px solid rgba(213, 173, 98, .55);
  outline-offset: 3px;
}

#studyEnvironment .studyExitIcon {
  color: var(--study-gold);
  font-size: 21px;
  line-height: 1;
}

#studyEnvironment .studyBrandMark {
  width: 34px;
  height: 34px;
  border: 1px solid rgba(213, 173, 98, .55);
  border-radius: 50%;
  object-fit: cover;
}

#studyEnvironment .studyBrandName {
  display: grid;
  gap: 2px;
  min-width: 0;
}

#studyEnvironment .studyBrandName strong {
  color: #f2f2ee;
  font-size: 12px;
  letter-spacing: .08em;
  transition: color .15s ease;
}

#studyEnvironment .studyBrandName span {
  color: #a9b8bf;
  font-size: 11px;
}

#studyEnvironment .studyProgress {
  display: grid;
  justify-items: center;
  gap: 3px;
  min-width: 0;
}

#studyEnvironment .studyProgressLabel {
  color: #9cabb2;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

#studyEnvironment #questionNumber {
  color: #f1d18d;
  font-size: 12px;
  font-weight: 750;
  white-space: nowrap;
}

#studyEnvironment .studyHeaderActions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  min-width: 0;
}

#studyEnvironment #studyFilterToggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid rgba(195, 211, 216, .27);
  border-radius: 10px;
  background: rgba(255, 255, 255, .06);
  color: #edf2f1;
  font-size: 12px;
  font-weight: 750;
  white-space: nowrap;
}

#studyEnvironment #studyFilterToggle:hover {
  border-color: rgba(213, 173, 98, .65);
  background: rgba(255, 255, 255, .1);
}

#studyEnvironment #studyFilterCount {
  display: inline-grid;
  place-items: center;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border-radius: 99px;
  background: var(--study-gold);
  color: #17252e;
  font-size: 10px;
  font-weight: 900;
}

#studyEnvironment #studyFilterCount[hidden] {
  display: none !important;
}

#studyEnvironment .studyAccountMount {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 7px;
  min-height: 40px;
  margin: 0;
}

#studyEnvironment #profileBtn.profile {
  width: auto;
  min-width: 40px;
  height: 38px;
  padding: 0 11px;
  border: 1px solid rgba(195, 211, 216, .28);
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  color: #f2f4f2;
  font-size: 11px;
  font-weight: 800;
}

#studyEnvironment #profileBtn.profile:hover,
#studyEnvironment #profileBtn.profile[aria-expanded="true"] {
  border-color: rgba(213, 173, 98, .65);
  background: rgba(255, 255, 255, .12);
}

#studyEnvironment .studyMain {
  width: min(100%, 1220px);
  margin: 0 auto;
  padding: 22px clamp(16px, 3vw, 36px) 48px;
}

#studyEnvironment .studyQuickFilters {
  display: flex;
  align-items: end;
  gap: 10px;
  width: 100%;
  max-width: 1040px;
  margin: 0 auto 12px;
  padding: 12px 14px;
  border: 1px solid var(--study-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 6px 20px rgba(18, 39, 50, .035);
}

#studyEnvironment .studyQuickFilters[hidden] {
  display: none !important;
}

#studyEnvironment .studyQuickFilterMount {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  flex: 1 1 auto;
  min-width: 0;
}

#studyEnvironment .studyQuickFilterMount label {
  display: grid !important;
  gap: 5px;
  min-width: 0;
  margin: 0 !important;
  color: #65737a;
  font-size: 10px;
  font-weight: 800;
  line-height: 1.15;
}

#studyEnvironment .studyQuickFilterMount select {
  width: 100%;
  min-width: 0;
  min-height: 40px;
  margin: 0 !important;
  padding: 8px 28px 8px 10px;
  border: 1px solid #dce3e3;
  border-radius: 9px;
  background: #fff;
  color: #24343c;
  font-size: 12px;
  font-weight: 650;
  box-shadow: none;
}

#studyEnvironment .studyQuickFilterMount select:hover,
#studyEnvironment .studyQuickFilterMount select:focus {
  border-color: #b7c4c6;
}

#studyEnvironment #studyQuickMoreFilters {
  flex: 0 0 auto;
  min-height: 40px;
  margin: 0;
  padding: 0 12px;
  border: 1px solid #d8c28f;
  border-radius: 9px;
  background: #fffaf0;
  color: #6f531b;
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

#studyEnvironment #studyQuickMoreFilters:hover,
#studyEnvironment #studyQuickMoreFilters:focus-visible {
  border-color: #caa453;
  background: #fff6e2;
}

@media (min-width: 851px) {
  #studyEnvironment #studyFilterToggle {
    display: none;
  }
}

#studyEnvironment #questoes.workspace {
  width: 100%;
  max-width: none;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: 0;
  margin: 0;
  padding: 0;
}

#studyEnvironment #questoes .questionArea {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0 0 36px;
  border-radius: 0;
  background: transparent;
}

#studyEnvironment #questoes .activeFilters,
#studyEnvironment #questoes .questionHeader,
#studyEnvironment #questoes .questionCard {
  width: 100%;
  max-width: 1040px;
  margin-right: auto;
  margin-left: auto;
}

#studyEnvironment #questoes .activeFilters {
  margin-bottom: 10px;
}

#studyEnvironment #questoes .questionHeader {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-top: 3px;
  margin-bottom: 12px;
  padding: 0 4px;
}

#studyEnvironment #questoes .questionHeader span {
  color: var(--study-muted);
}

#studyEnvironment #questoes #resultCount {
  font-size: 11px;
}

#studyEnvironment #questoes #questionMeta {
  margin-top: 5px;
  color: #40515b;
  font-size: 13px;
  font-weight: 750;
}

#studyEnvironment #questoes .badge {
  padding: 4px 0;
  background: transparent;
  color: #718088;
  font-size: 11px;
  font-weight: 650;
}

#studyEnvironment #questoes .questionCard {
  padding: clamp(22px, 4vw, 42px);
  border: 1px solid var(--study-line);
  border-radius: 18px;
  background: var(--study-surface);
  color: var(--study-ink);
  box-shadow: 0 10px 30px rgba(18, 39, 50, .055);
}

#studyEnvironment #questoes .questionTop {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  margin: 0 0 22px;
  padding: 0 0 12px;
  border-bottom: 1px solid #edf0ef;
}

#studyEnvironment #questoes .questionTopActions {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 7px;
  flex-wrap: wrap;
  margin-left: auto;
}

#studyEnvironment #questoes .questionTopActions button,
#studyEnvironment #questoes .favoriteBtn,
#studyEnvironment #questoes .questionMoreBtn {
  width: auto;
  min-height: 36px;
  margin: 0;
  padding: 7px 10px;
  border: 1px solid #e0e6e5;
  border-radius: 9px;
  background: #fff;
  color: #46575f;
  box-shadow: none;
  font-size: 12px;
}

#studyEnvironment #questoes #favoriteBtn {
  border-color: #dac28b;
  color: #6f531b;
  font-weight: 800;
}

#studyEnvironment #questoes #favoriteBtn:hover {
  background: #fff9ec;
}

#studyEnvironment #questoes .questionMoreActions {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 30;
  display: grid;
  width: min(300px, calc(100vw - 48px));
  min-width: 0;
  gap: 5px;
  padding: 8px;
  border: 1px solid var(--study-line);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 14px 32px rgba(16, 36, 47, .14);
}

#studyEnvironment #questoes .questionMoreActions.hidden,
#studyEnvironment #questoes .questionMoreActions[hidden] {
  display: none !important;
}

#studyEnvironment #questoes .questionMoreActions button {
  justify-content: flex-start;
  width: 100%;
  text-align: left;
}

#studyEnvironment #questoes .questionMoreActions .questionReportMenu {
  position: static;
  width: auto;
  margin: 4px 0 0;
  box-shadow: none;
}

#studyEnvironment #questoes .questionCard #statement {
  max-width: 900px;
  margin: 0 auto 26px;
  color: #18252d;
  font-size: clamp(20px, 2vw, 25px);
  font-weight: 650;
  line-height: 1.62;
  letter-spacing: -.012em;
}

#studyEnvironment #questoes #options {
  display: grid;
  max-width: 920px;
  gap: 11px;
  margin: 0 auto;
}

#studyEnvironment #questoes #options > button,
#studyEnvironment #questoes #options .optionChoice {
  min-width: 0;
  min-height: 58px;
  margin: 0;
  padding: 15px 17px;
  border: 1px solid #e2e7e6;
  border-radius: 12px;
  background: #fff;
  color: #2a373e;
  font-size: 15px;
  line-height: 1.55;
  text-align: left;
  box-shadow: none;
}

#studyEnvironment #questoes #options > button:hover,
#studyEnvironment #questoes #options .optionChoice:hover,
#studyEnvironment #questoes #options > button.selected,
#studyEnvironment #questoes #options .optionChoice.selected {
  border-color: #9aafae;
  background: #f7faf9;
}

#studyEnvironment #questoes #options > button:focus-visible,
#studyEnvironment #questoes #options .optionChoice:focus-visible {
  outline: 3px solid rgba(49, 95, 120, .22);
  outline-offset: 2px;
}

#studyEnvironment #questoes .questionActions {
  display: grid;
  grid-template-columns: minmax(100px, 1fr) minmax(180px, 230px) minmax(100px, 1fr);
  align-items: center;
  gap: 12px;
  max-width: 920px;
  margin: 24px auto 0;
}

#studyEnvironment #questoes .questionActions .ghost,
#studyEnvironment #questoes .questionActions .answerBtn {
  width: auto;
  min-height: 46px;
  margin: 0;
}

#studyEnvironment #questoes .questionActions .answerBtn {
  justify-self: center;
  width: 100%;
  margin-left: 0;
}

#studyEnvironment #questoes .feedback {
  max-width: 920px;
  margin: 24px auto 0;
  padding-top: 20px;
  border-top: 1px solid #e8ecea;
}

#studyEnvironment #questoes .questionSource,
#studyEnvironment #questoes .keyboardHint {
  max-width: 920px;
  margin-right: auto;
  margin-left: auto;
  color: #7a8589;
}

#studyEnvironment #questoes .keyboardHint {
  display: block;
  margin-top: 18px;
  font-size: 11px;
  text-align: center;
}

#studyEnvironment #questoes .questionCard img,
#studyEnvironment #questoes .questionCard video,
#studyEnvironment #questoes .questionCard iframe {
  display: block;
  max-width: 100%;
  height: auto;
  margin-right: auto;
  margin-left: auto;
}

#studyEnvironment #sessionPerformancePanel {
  display: none !important;
}

#studyFilterDialog {
  position: fixed;
  inset: 0 0 0 auto;
  width: min(480px, calc(100vw - 24px));
  max-width: none;
  height: 100vh;
  max-height: none;
  margin: 0;
  padding: 24px;
  overflow: auto;
  border: 0;
  border-left: 1px solid var(--study-line);
  border-radius: 18px 0 0 18px;
  background: #fff;
  color: var(--study-ink);
  box-shadow: -18px 0 44px rgba(16, 36, 47, .16);
}

#studyFilterDialog::backdrop {
  background: rgba(8, 24, 34, .48);
  backdrop-filter: blur(3px);
}

#studyFilterDialog .studyFilterHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--study-line);
}

#studyFilterDialog .studyFilterHeader span {
  color: #9a7940;
  font-size: 9px;
  font-weight: 850;
  letter-spacing: .13em;
}

#studyFilterDialog .studyFilterHeader h2 {
  margin: 4px 0 0;
  color: #17252e;
  font-size: 22px;
}

#studyFilterDialog #studyFilterClose {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--study-line);
  border-radius: 10px;
  background: #fff;
  color: #54636a;
  font-size: 23px;
}

#studyFilterDialog #studyFilterMount .filters {
  position: static;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 13px 11px;
  height: auto;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

#studyFilterDialog #studyFilterMount .filters label,
#studyFilterDialog #studyFilterMount .filters label:nth-of-type(n) {
  display: block !important;
  min-width: 0;
  margin: 0;
  color: #65737a;
  font-size: 11px;
  font-weight: 750;
}

#studyFilterDialog #studyFilterMount .filters label:first-of-type {
  grid-column: 1 / -1;
}

#studyFilterDialog #studyFilterMount .filters input,
#studyFilterDialog #studyFilterMount .filters select {
  width: 100%;
  min-height: 42px;
  margin-top: 6px;
  padding: 9px 10px;
  border: 1px solid #dce3e3;
  border-radius: 9px;
  background: #fff;
  color: #24343c;
}

#studyFilterDialog #studyFilterMount .filterToggle,
#studyFilterDialog #studyFilterMount .advancedQuestionFilters,
#studyFilterDialog #studyFilterMount #clear {
  grid-column: 1 / -1;
}

#studyFilterDialog #studyFilterMount .filterToggle,
#studyFilterDialog #studyFilterMount .advancedQuestionFilters .ghost {
  width: 100%;
  margin: 0;
}

#studyFilterDialog #studyFilterMount .modeButtons {
  margin-bottom: 9px;
}

@media (max-width: 850px) {
  #studyEnvironment .studyQuickFilters {
    display: none !important;
  }

  #studyEnvironment .studyHeader {
    grid-template-columns: minmax(170px, 1fr) minmax(140px, .8fr) minmax(170px, 1fr);
    gap: 10px;
    padding-right: 18px;
    padding-left: 18px;
  }

  #studyEnvironment .studyMain {
    padding-right: 22px;
    padding-left: 22px;
  }
}

@media (max-width: 640px) {
  #studyEnvironment .studyHeader {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 5px 10px;
    min-height: 0;
    padding: 8px 12px 7px;
  }

  #studyEnvironment .studyExit {
    gap: 7px;
  }

  #studyEnvironment .studyBrandMark {
    width: 30px;
    height: 30px;
  }

  #studyEnvironment .studyBrandName strong {
    font-size: 10px;
  }

  #studyEnvironment .studyBrandName span {
    font-size: 10px;
  }

  #studyEnvironment .studyProgress {
    grid-column: 1 / -1;
    grid-row: 2;
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding: 5px 1px 0;
    border-top: 1px solid rgba(195, 211, 216, .13);
  }

  #studyEnvironment .studyProgressLabel {
    font-size: 8px;
  }

  #studyEnvironment .studyHeaderActions {
    gap: 6px;
  }

  #studyEnvironment #studyFilterToggle {
    min-height: 34px;
    padding: 0 9px;
    font-size: 11px;
  }

  #studyEnvironment #profileBtn.profile {
    min-width: 34px;
    height: 34px;
    padding: 0 8px;
    font-size: 10px;
  }

  #studyEnvironment .studyMain {
    padding: 13px 12px 30px;
  }

  #studyEnvironment #questoes .questionHeader {
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 8px;
    padding: 0 2px;
  }

  #studyEnvironment #questoes #resultCount {
    font-size: 10px;
  }

  #studyEnvironment #questoes #questionMeta {
    font-size: 12px;
  }

  #studyEnvironment #questoes .badge {
    max-width: 42%;
    font-size: 9px;
    text-align: right;
  }

  #studyEnvironment #questoes .questionCard {
    padding: 18px 15px 20px;
    border-radius: 14px;
    box-shadow: 0 5px 18px rgba(18, 39, 50, .045);
  }

  #studyEnvironment #questoes .questionTop {
    margin-bottom: 18px;
    padding-bottom: 10px;
  }

  #studyEnvironment #questoes .questionTopActions {
    gap: 6px;
  }

  #studyEnvironment #questoes .questionTopActions button,
  #studyEnvironment #questoes .favoriteBtn,
  #studyEnvironment #questoes .questionMoreBtn {
    min-height: 34px;
    padding: 6px 8px;
    font-size: 11px;
  }

  #studyEnvironment #questoes .questionCard #statement {
    margin-bottom: 21px;
    font-size: 19px;
    line-height: 1.58;
  }

  #studyEnvironment #questoes #options {
    gap: 9px;
  }

  #studyEnvironment #questoes #options > button,
  #studyEnvironment #questoes #options .optionChoice {
    min-height: 54px;
    padding: 13px 12px;
    border-radius: 11px;
    font-size: 14px;
  }

  #studyEnvironment #questoes .questionActions {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 9px;
    margin-top: 20px;
  }

  #studyEnvironment #questoes .questionActions #answerBtn {
    grid-column: 1 / -1;
    grid-row: 1;
    min-height: 48px;
  }

  #studyEnvironment #questoes .questionActions #prevQuestion {
    grid-column: 1;
    grid-row: 2;
  }

  #studyEnvironment #questoes .questionActions #skipQuestion {
    grid-column: 2;
    grid-row: 2;
  }

  #studyFilterDialog {
    inset: 0;
    width: 100vw;
    height: 100dvh;
    padding: 18px 16px max(18px, env(safe-area-inset-bottom));
    border: 0;
    border-radius: 0;
  }

  #studyFilterDialog #studyFilterMount .filters {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  #studyFilterDialog #studyFilterMount .filters label:first-of-type,
  #studyFilterDialog #studyFilterMount .filterToggle,
  #studyFilterDialog #studyFilterMount .advancedQuestionFilters,
  #studyFilterDialog #studyFilterMount #clear {
    grid-column: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  #studyEnvironment *,
  #studyFilterDialog * {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}