/* Quiz workspace */

  .quiz-shell {
    min-height: calc(100vh - 44px);
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  .quiz-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    background: var(--surface-elevated);
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow);
    border-radius: 24px;
    padding: 14px 16px;
    position: sticky;
    top: 16px;
    z-index: 5;
  }
  .quiz-setup-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 18px;
    align-items: center;
    background: var(--surface-elevated);
    border: 1px solid var(--card-border);
    box-shadow: none;
    border-radius: 24px;
    padding: 18px 20px;
    margin-top: 16px;
  }
  #tab-quiz .quiz-options-body {
    padding-top: 0;
  }
  #tab-quiz .quiz-options > summary {
    cursor: default;
    pointer-events: none;
  }
  #tab-quiz .quiz-options-chevron {
    display: none;
  }
  body.quiz-mode #tab-quiz .quiz-options > summary {
    cursor: pointer;
    pointer-events: auto;
  }
  body.quiz-mode #tab-quiz .quiz-options-chevron {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  #tab-quiz #quizGroupMode {
    min-height: 126px;
    overflow: auto;
  }
  #tab-quiz .group-filter-summary {
    margin-top: 0;
    color: var(--muted);
    font-size: 13px;
    font-weight: 750;
  }
  #tab-quiz .quiz-setup-actions {
    background: var(--surface-elevated);
    border-color: var(--card-border);
    box-shadow: none;
  }
  .quiz-setup-kicker {
    margin: 0 0 8px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
  }
  .quiz-setup-copy h3 {
    margin: 0;
    font-size: clamp(20px, 2.2vw, 28px);
    letter-spacing: -0.03em;
    line-height: 1.08;
  }
  .quiz-setup-copy p {
    margin: 8px 0 0;
    color: var(--muted);
    line-height: 1.6;
  }
  .quiz-setup-buttons {
    justify-content: flex-end;
    align-items: center;
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }
  .quiz-setup-side {
    display: grid;
    gap: 10px;
    justify-items: end;
    width: min(100%, 390px);
  }
  .quiz-difficulty-control {
    position: relative;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 10px;
    width: 100%;
    min-height: 24px;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    overflow: visible;
  }
  .quiz-difficulty-control[hidden],
  .quiz-difficulty-control[aria-hidden="true"] {
    display: none !important;
  }
  .quiz-difficulty-label {
    position: relative;
    z-index: 1;
    padding: 0;
    color: var(--muted);
    font-size: 11px;
    font-weight: 900;
    letter-spacing: .08em;
    line-height: 1;
    text-transform: uppercase;
    white-space: nowrap;
    pointer-events: none;
  }
  .quiz-difficulty-control input[type="range"] {
    display: none;
  }
  .quiz-difficulty-track {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
    min-width: 190px;
    min-height: 22px;
    height: 22px;
    overflow: hidden;
    border: 1px solid rgba(148, 163, 184, .38);
    border-color: color-mix(in srgb, var(--line, #cbd5e1) 82%, var(--text, #0f172a) 18%);
    border-radius: 9px;
    background: color-mix(in srgb, var(--surface-muted) 46%, var(--surface) 54%);
    text-align: center;
    color: var(--muted);
    font-size: 12px;
    font-weight: 850;
  }
  .quiz-difficulty-track::before {
    display: none;
  }
  .quiz-difficulty-option {
    appearance: none;
    display: grid;
    place-items: center;
    min-width: 0;
    min-height: 0;
    margin: 0;
    padding: 0 10px;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: inherit;
    font: inherit;
    font-size: 11px;
    font-weight: 850;
    line-height: 1;
    cursor: pointer;
  }
  .quiz-difficulty-option:hover,
  .quiz-difficulty-option:focus-visible {
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    outline: 0;
  }
  .quiz-difficulty-option.is-selected {
    background: var(--accent);
    color: #fff;
  }
  .quiz-difficulty-option:disabled {
    opacity: .55;
    cursor: not-allowed;
  }
  .quiz-setup-buttons > button {
    width: 100%;
    justify-content: center;
  }
  .quiz-toolbar-actions {
    justify-content: flex-end;
    flex-wrap: wrap;
  }
  .quiz-toolbar-actions > * {
    flex: 0 0 auto;
  }
  .quiz-focus {
    background: var(--surface-elevated);
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow);
    border-radius: 28px;
    padding: 20px;
  }
  body.quiz-round-complete #exitQuizBtn,
  body.quiz-round-complete #quizRevealBtn,
  body.quiz-round-complete #quizBackBtn,
  body.quiz-round-complete #quizNextBtn,
  body.quiz-round-complete #quizStudySetBtn,
  body.quiz-round-complete #quizStartBtn {
    display: none !important;
  }
  .quiz-completion {
    width: min(760px, 100%);
    margin: 28px auto;
    display: grid;
    gap: 22px;
    padding: 28px;
    border: 1px solid var(--card-border);
    border-radius: 20px;
    background: var(--surface-muted);
  }
  .quiz-completion-copy {
    text-align: center;
  }
  .quiz-completion-kicker {
    margin-bottom: 8px;
    color: var(--accent-strong);
    font-size: 12px;
    font-weight: 900;
    text-transform: uppercase;
  }
  .quiz-completion h2 {
    margin: 0;
    font-size: 30px;
    line-height: 1.15;
  }
  .quiz-completion p {
    margin: 10px auto 0;
    max-width: 580px;
    color: var(--muted);
    line-height: 1.55;
  }
  .quiz-completion-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
  }
  .quiz-completion-stats > div {
    min-width: 0;
    padding: 14px;
    text-align: center;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    background: var(--surface-elevated);
  }
  .quiz-completion-stats span,
  .quiz-completion-stats strong {
    display: block;
  }
  .quiz-completion-stats span {
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
  }
  .quiz-completion-stats strong {
    margin-top: 5px;
    font-size: 24px;
  }
  .quiz-completion-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
  }
  .quiz-completion-actions > button {
    min-width: 150px;
  }
  @media (max-width: 620px) {
    .quiz-completion {
      margin: 12px auto;
      padding: 20px 16px;
    }
    .quiz-completion h2 {
      font-size: 25px;
    }
    .quiz-completion-stats {
      grid-template-columns: 1fr;
    }
    .quiz-completion-actions {
      display: grid;
      grid-template-columns: 1fr;
    }
    .quiz-completion-actions > button {
      width: 100%;
      min-width: 0;
    }
  }
  body:not(.quiz-mode) #tab-quiz .quiz-mode-badges,
  body:not(.quiz-mode) #tab-quiz .quiz-mode-only,
  body:not(.quiz-mode) #tab-quiz .quiz-focus {
    display: none !important;
  }
  body:not(.quiz-mode) #tab-quiz #quizArea {
    display: none !important;
  }
  body.quiz-mode #tab-quiz .quiz-setup-actions,
  body.quiz-mode #tab-quiz #quizEmpty {
    display: none !important;
  }
  .quiz-only-input {
    max-width: 820px;
    margin: 0 auto 8px;
  }
  .quiz-only-input input {
    font-size: 18px;
    padding: 16px 18px;
    border-radius: 18px;
  }
  .quiz-only-input .row {
    align-items: center;
    flex-wrap: nowrap;
  }
  .quiz-only-input .row input {
    flex: 1 1 auto;
    min-width: 0;
  }
  .quiz-only-input[data-answer-state] .row::before {
    content: "";
    flex: 0 0 34px;
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 999px;
    font-size: 21px;
    font-weight: 950;
    line-height: 1;
    border: 1px solid currentColor;
  }
  .quiz-only-input[data-answer-state="right"] .row::before {
    content: "✓";
    color: #16a34a;
    background: color-mix(in srgb, #22c55e 14%, var(--surface-elevated) 86%);
  }
  .quiz-only-input[data-answer-state="wrong"] .row::before {
    content: "×";
    color: #dc2626;
    background: color-mix(in srgb, #ef4444 12%, var(--surface-elevated) 88%);
  }
  .quiz-correct-answer {
    border-color: color-mix(in srgb, var(--success-text, #17803a) 38%, var(--card-border) 62%);
    box-shadow: 0 10px 24px color-mix(in srgb, var(--success-text, #17803a) 14%, transparent);
  }
  .quiz-answer-match {
    margin-top: 8px;
    color: color-mix(in srgb, var(--success-text, #17803a) 76%, var(--text) 24%);
    font-size: 13px;
    font-weight: 850;
  }
  .quiz-answer-guide {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 10px;
    border: 1px solid var(--card-border);
  }
  .quiz-answer-guide strong {
    font-size: 13px;
    font-weight: 950;
    letter-spacing: 0.08em;
    line-height: 1;
    text-transform: uppercase;
    white-space: nowrap;
  }
  .quiz-answer-guide span {
    min-width: 0;
    color: var(--text);
    font-weight: 750;
  }
  .quiz-answer-guide[data-state="saved"] {
    color: #16a34a;
    background: color-mix(in srgb, #22c55e 10%, var(--surface-elevated) 90%);
    border-color: color-mix(in srgb, #16a34a 34%, var(--card-border) 66%);
  }
  .quiz-answer-guide[data-state="revealed"] {
    color: #9a6700;
    background: color-mix(in srgb, #f59e0b 10%, var(--surface-elevated) 90%);
    border-color: color-mix(in srgb, #d97706 34%, var(--card-border) 66%);
  }
  .quiz-answer-hint {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 10px;
    border: 1px solid var(--card-border);
    box-shadow: 0 10px 24px color-mix(in srgb, var(--shadow) 52%, transparent);
  }
  .quiz-answer-hint strong {
    font-size: 13px;
    font-weight: 950;
    letter-spacing: 0.08em;
    line-height: 1;
    text-transform: uppercase;
    white-space: nowrap;
  }
  .quiz-answer-hint span {
    min-width: 0;
    color: var(--text);
    font-weight: 750;
  }
  .quiz-answer-hint[data-heat="cold"] {
    color: #dc2626;
    background: color-mix(in srgb, #dc2626 8%, var(--surface-elevated) 92%);
    border-color: color-mix(in srgb, #dc2626 34%, var(--card-border) 66%);
  }
  .quiz-answer-hint[data-heat="warmer"] {
    color: #f97316;
    background: color-mix(in srgb, #f97316 9%, var(--surface-elevated) 91%);
    border-color: color-mix(in srgb, #f97316 34%, var(--card-border) 66%);
  }
  .quiz-answer-hint[data-heat="hot"] {
    color: #a16207;
    background: color-mix(in srgb, #eab308 13%, var(--surface-elevated) 87%);
    border-color: color-mix(in srgb, #eab308 36%, var(--card-border) 64%);
  }
  .quiz-answer-hint[data-heat="very-hot"] {
    color: #4d7c0f;
    background: color-mix(in srgb, #84cc16 13%, var(--surface-elevated) 87%);
    border-color: color-mix(in srgb, #65a30d 36%, var(--card-border) 64%);
  }
  .quiz-actions {
    justify-content: center;
    margin-top: 10px;
  }
  .quiz-empty {
    padding: 26px;
    border: 1px dashed var(--line);
    border-radius: 24px;
    background: var(--surface-muted);
    text-align: center;
  }
  .study-set-modal {
    position: fixed;
    inset: 0;
    z-index: 930;
    display: none;
  }
  .study-set-modal.open {
    display: block;
  }
  .hard-card-modal {
    position: fixed;
    inset: 0;
    z-index: 940;
    display: none;
  }
  .hard-card-modal.open {
    display: block;
  }
  .hard-card-scrim {
    position: absolute;
    inset: 0;
    background: rgba(15,23,42,0.34);
    backdrop-filter: blur(8px);
  }
  .hard-card-panel {
    position: absolute;
    inset: 50% auto auto 50%;
    transform: translate(-50%, -50%);
    width: min(860px, calc(100vw - 32px));
    max-height: min(92vh, 820px);
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    gap: 18px;
    padding: 18px;
    background: linear-gradient(180deg, var(--surface-elevated), var(--surface-raised));
    border: 1px solid var(--card-border);
    border-radius: 30px;
    box-shadow: 0 34px 78px rgba(15,23,42,0.24);
    overflow: hidden;
  }
  .hard-card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
  }
  .hard-card-kicker {
    margin: 0 0 6px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-strong);
  }
  .hard-card-top h3 {
    margin: 0;
    font-size: clamp(22px, 3vw, 32px);
    line-height: 1.08;
    letter-spacing: -0.03em;
  }
  .hard-card-stage {
    min-height: 0;
    display: grid;
    place-items: center;
    padding: 2px;
  }
  .hard-card-preview-card {
    width: min(100%, var(--anatomy-quiz-fit-width, 720px));
    max-height: min(var(--anatomy-quiz-fit-height, 560px), calc(92vh - 150px));
    cursor: pointer;
  }
  .study-set-scrim {
    position: absolute;
    inset: 0;
    background: rgba(15,23,42,0.34);
    backdrop-filter: blur(8px);
  }
  .study-set-card {
    position: absolute;
    inset: 50% auto auto 50%;
    transform: translate(-50%, -50%);
    width: min(1120px, calc(100vw - 32px));
    max-height: min(90vh, 920px);
    overflow: hidden;
    display: grid;
    grid-template-rows: auto 1fr;
    background: linear-gradient(180deg, var(--surface-elevated), var(--surface-raised));
    border: 1px solid var(--card-border);
    border-radius: 30px;
    box-shadow: 0 34px 78px rgba(15,23,42,0.24);
  }
  .study-set-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 18px;
    padding: 22px 22px 16px;
    border-bottom: 1px solid var(--line);
    background:
      radial-gradient(circle at top right, rgba(37,99,235,0.10), transparent 34%),
      linear-gradient(180deg, var(--surface-elevated), var(--surface-raised));
  }
  .study-set-kicker {
    margin: 0 0 8px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-strong);
  }
  .study-set-top h3 {
    margin: 0;
    font-size: clamp(24px, 3vw, 34px);
    letter-spacing: -0.04em;
    line-height: 1.04;
  }
  .study-set-top p {
    margin: 8px 0 0;
    color: var(--muted);
    line-height: 1.6;
  }
  .study-set-body {
    display: grid;
    grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
    min-height: 0;
  }
  .study-set-list {
    min-height: 0;
    overflow: auto;
    scrollbar-gutter: stable both-edges;
    padding: 16px;
    border-right: 1px solid var(--line);
    background: var(--surface-muted);
  }
  .study-set-modal.single-entry .study-set-body {
    grid-template-columns: minmax(0, 1fr);
  }
  .study-set-modal.single-entry .study-set-list {
    display: none;
  }
  .study-set-modal.single-entry .study-set-detail {
    min-height: min(62vh, 680px);
  }
  .study-set-list-item {
    width: 100%;
    margin-bottom: 10px;
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 14px;
    background: var(--surface-elevated);
    text-align: left;
    cursor: pointer;
    transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
  }
  .study-set-list-item:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 28px rgba(15,23,42,0.08);
  }
  .study-set-list-item.active {
    border-color: rgba(37,99,235,0.28);
    box-shadow: 0 0 0 4px rgba(37,99,235,0.08), 0 16px 30px rgba(37,99,235,0.10);
  }
  .study-set-focus-pulse {
    border-color: color-mix(in srgb, var(--accent-strong) 48%, var(--line)) !important;
    box-shadow:
      0 0 0 4px var(--accent-soft),
      0 18px 34px var(--accent-shadow-soft) !important;
    animation: studySetFocusPulse 1.35s ease-out 1;
  }
  @keyframes studySetFocusPulse {
    0% {
      transform: scale(0.985);
      filter: saturate(0.95);
    }
    38% {
      transform: scale(1.012);
      filter: saturate(1.08);
    }
    100% {
      transform: scale(1);
      filter: saturate(1);
    }
  }
  .study-set-list-code {
    font-weight: 800;
    color: var(--accent-strong);
  }
  .study-set-list-name {
    margin-top: 6px;
    line-height: 1.5;
    color: var(--text);
  }
  .study-set-list-meta {
    margin-top: 8px;
    color: var(--muted);
    font-size: 12px;
  }
  .study-set-detail {
    min-height: 0;
    overflow: auto;
    scrollbar-gutter: stable both-edges;
    padding: 22px;
  }
  .study-set-detail-empty {
    padding: 20px;
    border-radius: 22px;
    border: 1px dashed var(--line);
    background: var(--surface-muted);
    color: var(--muted);
    line-height: 1.7;
  }
  .study-set-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 18px;
  }
  .study-set-detail-title {
    margin: 0;
    font-size: clamp(24px, 3vw, 34px);
    line-height: 1.05;
    letter-spacing: -0.04em;
  }
  .study-set-detail-sub {
    margin-top: 8px;
    color: var(--muted);
    line-height: 1.6;
  }
  .study-set-detail-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
  }
  .study-set-detail-grid {
    display: grid;
    gap: 18px;
  }
  .study-set-detail-section {
    padding: 18px;
    border-radius: 24px;
    border: 1px solid var(--line);
    background: var(--surface-raised);
    box-shadow: 0 18px 34px rgba(15,23,42,0.05);
  }
  .study-set-detail-section h4 {
    margin: 0 0 12px;
    font-size: 18px;
    letter-spacing: -0.02em;
  }
  .study-set-list-item.active:hover {
    border-color: rgba(37,99,235,0.32);
    box-shadow: 0 0 0 4px rgba(37,99,235,0.08), 0 18px 34px rgba(37,99,235,0.12);
    transform: translateY(-1px) scale(1.01);
  }
  .anatomy-quiz-shell {
    display: grid;
    gap: 14px;
    align-items: center;
    justify-items: center;
  }
  .anatomy-quiz-shell[hidden] {
    display: none !important;
  }
  .anatomy-quiz-card-stage {
    display: grid;
    place-items: center;
    min-height: 0;
    width: 100%;
  }
  .anatomy-quiz-card {
    width: min(100%, var(--anatomy-quiz-fit-width, 720px));
    aspect-ratio: var(--anatomy-quiz-aspect, 4 / 3);
    max-height: var(--anatomy-quiz-fit-height, calc(100vh - 260px));
    position: relative;
    border-radius: 30px;
    background: transparent;
    box-shadow: none;
    overflow: visible;
    cursor: grab;
    perspective: 1800px;
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
  }
  .anatomy-quiz-card:active {
    cursor: grabbing;
  }
  .anatomy-quiz-card-rotator {
    position: absolute;
    inset: 0;
    transform-style: preserve-3d;
    transition: transform .62s cubic-bezier(.18,.82,.18,1);
    will-change: transform;
    -webkit-user-select: none;
    user-select: none;
  }
  .anatomy-quiz-card[data-face="back"] .anatomy-quiz-card-rotator {
    transform: rotateY(180deg);
  }
  .anatomy-quiz-card-face {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    border-radius: 30px;
    border: 1px solid rgba(234, 88, 12, 0.24);
    background:
      radial-gradient(circle at top right, rgba(251,146,60,0.24), transparent 28%),
      linear-gradient(180deg, #fff7ed, #ffedd5);
    box-shadow: 0 28px 60px rgba(234,88,12,0.12);
    overflow: hidden;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform-style: preserve-3d;
    outline: 1px solid rgba(255,255,255,0.18);
    box-shadow:
      inset 0 1px 0 rgba(255,255,255,0.34),
      inset 0 -10px 18px rgba(15,23,42,0.045),
      0 22px 52px rgba(15,23,42,0.10);
    -webkit-user-select: none;
    user-select: none;
  }
  .anatomy-quiz-card-front {
    padding: 0;
    transform: rotateY(0deg) translateZ(0.2px);
  }
  .anatomy-quiz-card-back {
    transform: rotateY(180deg) translateZ(0.2px);
    padding: 0;
  }
  .anatomy-quiz-card-media {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    background: transparent;
    overflow: visible;
    position: relative;
    -webkit-user-select: none;
    user-select: none;
  }
  .anatomy-quiz-card-media img {
    width: 100%;
    height: 100%;
    max-width: none;
    max-height: none;
    object-fit: contain;
    display: block;
    background: transparent;
    border-radius: 0;
    -webkit-user-select: none;
    user-select: none;
    -webkit-user-drag: none;
  }
  .anatomy-quiz-mask-layer {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 2;
    pointer-events: none;
  }
  .anatomy-quiz-mask-path {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    pointer-events: stroke;
    cursor: pointer;
    transition: opacity .14s ease;
  }
  .anatomy-quiz-mask-path:hover,
  .anatomy-quiz-mask-path:focus-visible {
    filter: brightness(0.9);
  }
  .anatomy-quiz-mask-path.is-revealed {
    opacity: 0.20;
    pointer-events: stroke;
  }
  .anatomy-quiz-card-answer {
    width: 100%;
    min-height: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    box-sizing: border-box;
    padding: 28px;
    text-align: center;
    color: #7c2d12;
    font-size: clamp(28px, 3.6vw, 44px);
    font-weight: 800;
    line-height: 1.12;
    letter-spacing: -0.04em;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    word-break: break-word;
    overflow-y: auto;
    -webkit-user-select: none;
    user-select: none;
  }
  .anatomy-quiz-card-answer.anatomy-quiz-card-answer-image {
    padding: 0 !important;
    overflow: hidden !important;
  }
  .anatomy-quiz-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    width: var(--anatomy-quiz-actions-width, min(100%, var(--anatomy-quiz-fit-width, 720px)));
    margin: 0 auto;
  }
  .anatomy-quiz-action {
    min-height: 56px;
    border-radius: 18px;
    font-size: 15px;
    font-weight: 800;
  }

  html[data-theme="dark"] .quiz-topbar,
  html[data-theme="dark"] .quiz-setup-actions,
  html[data-theme="dark"] .quiz-focus {
    background: var(--surface-elevated);
    border-color: var(--card-border);
  }
  html[data-theme="dark"] .quiz-empty {
    background: var(--surface-muted);
    border-color: var(--line);
  }
  html[data-theme="dark"] .study-set-card {
    background: linear-gradient(180deg, rgba(10,18,34,0.98), rgba(15,24,42,0.96));
    border-color: var(--card-border);
    box-shadow: 0 34px 78px rgba(2,6,23,0.56);
  }
  html[data-theme="dark"] .study-set-top {
    background:
      radial-gradient(circle at top right, rgba(96,165,250,0.14), transparent 34%),
      linear-gradient(180deg, rgba(10,18,34,0.96), rgba(15,24,42,0.92));
    border-bottom-color: var(--line);
  }
  html[data-theme="dark"] .study-set-kicker {
    color: var(--accent-strong);
  }
  html[data-theme="dark"] .study-set-list {
    background: rgba(8,15,29,0.72);
    border-right-color: var(--line);
  }
  html[data-theme="dark"] .study-set-list-item,
  html[data-theme="dark"] .study-set-detail-section {
    background: var(--surface-raised);
    border-color: var(--line);
  }
  html[data-theme="dark"] .study-set-list-item:hover {
    box-shadow: 0 14px 28px rgba(2,6,23,0.28);
  }
  html[data-theme="dark"] .study-set-list-item.active:hover {
    box-shadow: 0 0 0 4px rgba(96,165,250,0.10), 0 18px 34px rgba(2,6,23,0.34);
  }
  html[data-theme="dark"] .study-set-modal.single-entry .study-set-detail {
    background: linear-gradient(180deg, rgba(10,18,34,0.68), rgba(15,24,42,0.28));
  }
  html[data-theme="dark"] .study-set-list-code {
    color: #bfdbfe;
  }
  html[data-theme="dark"] .study-set-list-name,
  html[data-theme="dark"] .study-set-detail-empty,
  html[data-theme="dark"] .study-set-detail-sub {
    color: var(--text);
  }
  html[data-theme="dark"] .study-set-detail-empty {
    background: var(--surface-muted);
    border-color: var(--line);
  }
  html[data-theme="dark"] .anatomy-quiz-card-face {
    background:
      radial-gradient(circle at top right, rgba(251,146,60,0.18), transparent 30%),
      linear-gradient(180deg, rgba(92,33,7,0.96), rgba(67,20,7,0.92));
    border-color: rgba(251,146,60,0.2);
    box-shadow: 0 28px 60px rgba(2,6,23,0.42);
  }
  html[data-theme="dark"] .anatomy-quiz-card-media {
    background: transparent;
  }
  html[data-theme="dark"] .anatomy-quiz-card-answer {
    color: #ffedd5;
  }

  /* Quiz setup redesign */
  #tab-quiz {
    --quiz-panel-radius: 22px;
    --quiz-panel-shadow: 0 14px 34px rgba(15, 23, 42, 0.07);
    --quiz-soft-blue: var(--selected-bg, color-mix(in srgb, var(--accent, #2563eb) 9%, #f8fbff));
    --quiz-soft-line: var(--control-border, color-mix(in srgb, var(--line, #dbe3ef) 72%, transparent));
  }

  #tab-quiz .quiz-options {
    background: var(--surface-elevated);
    border: 1px solid var(--quiz-soft-line);
    border-radius: var(--quiz-panel-radius);
    box-shadow: var(--quiz-panel-shadow);
    padding: clamp(18px, 2.3vw, 28px);
    margin: 0 0 18px;
  }

  #tab-quiz .quiz-options > summary,
  #tab-quiz .quiz-setup-actions {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 18px;
  }

  #tab-quiz .quiz-options > summary {
    list-style: none;
    margin-bottom: 22px;
  }

  #tab-quiz .quiz-options > summary::-webkit-details-marker {
    display: none;
  }

  #tab-quiz .quiz-options-summary-text > span:first-child,
  #tab-quiz .quiz-setup-copy .quiz-setup-kicker {
    display: block;
    color: var(--text);
    font-size: clamp(24px, 2.4vw, 34px);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.08;
    text-transform: none;
  }

  #tab-quiz .quiz-options-summary-sub,
  #tab-quiz .quiz-setup-copy p {
    display: block;
    margin-top: 8px;
    color: var(--muted);
    font-size: clamp(14px, 1.3vw, 16px);
    font-weight: 650;
    line-height: 1.45;
  }

  #tab-quiz .quiz-panel-icon {
    display: inline-grid;
    place-items: center;
    width: 56px;
    height: 56px;
    border-radius: 14px;
    color: #16a34a;
    background: linear-gradient(180deg, color-mix(in srgb, #22c55e 16%, #ffffff), color-mix(in srgb, #22c55e 8%, #ffffff));
    border: 1px solid color-mix(in srgb, #22c55e 18%, transparent);
    box-shadow: 0 10px 24px rgba(34, 197, 94, 0.12);
  }

  #tab-quiz .quiz-panel-icon svg,
  #tab-quiz .quiz-small-icon svg,
  #tab-quiz .quiz-include-caret svg {
    width: 28px;
    height: 28px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  #tab-quiz .quiz-options-body {
    padding: 0;
  }

  #tab-quiz .group-filter-grid {
    display: grid;
    grid-template-columns: minmax(260px, 1fr) minmax(300px, 1fr);
    gap: clamp(16px, 2.4vw, 28px);
    align-items: stretch;
  }

  #tab-quiz .quiz-include-panel,
  #tab-quiz .quiz-group-preview-panel {
    position: relative;
    display: grid;
    align-content: start;
    gap: 14px;
    min-width: 0;
  }

  #tab-quiz .quiz-include-panel > label,
  #tab-quiz .quiz-group-preview-panel > label {
    margin: 0;
    color: var(--muted);
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  #tab-quiz #quizGroupMode {
    position: absolute;
    width: 1px;
    height: 1px;
    min-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    clip-path: inset(50%);
  }

  #tab-quiz #quizGroupMode option {
    min-height: 96px;
    padding: 28px 20px;
  }

  #tab-quiz .quiz-include-card,
  #tab-quiz .quiz-group-preview-panel {
    border: 1px solid var(--quiz-soft-line);
    border-radius: 18px;
    background: var(--surface);
  }

  #tab-quiz .quiz-include-card strong {
    display: block;
    color: var(--text);
    font-size: 16px;
    font-weight: 900;
    line-height: 1.2;
  }

  #tab-quiz .quiz-include-card small {
    display: block;
    margin-top: 6px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 650;
    line-height: 1.3;
  }

  #tab-quiz .quiz-include-caret {
    color: var(--muted);
    flex: 0 0 auto;
  }

  #tab-quiz .quiz-include-card-stack {
    display: grid;
    border: 1px solid var(--quiz-soft-line);
    border-radius: 18px;
    overflow: hidden;
    background: var(--surface);
  }

  #tab-quiz .quiz-include-card {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 16px;
    min-height: 104px;
    padding: 18px 20px;
    border-width: 0 0 1px;
    border-radius: 0;
    cursor: pointer;
    transition: background .15s ease, border-color .15s ease, box-shadow .15s ease;
  }

  #tab-quiz .quiz-include-card:hover,
  #tab-quiz .quiz-include-card:focus-visible {
    background: var(--control-hover-bg, color-mix(in srgb, var(--accent) 7%, var(--surface) 93%));
    outline: none;
  }

  #tab-quiz .quiz-include-card:focus-visible {
    box-shadow: inset 0 0 0 2px var(--focus-ring, color-mix(in srgb, var(--accent) 34%, transparent));
  }

  #tab-quiz .quiz-include-card:last-child {
    border-bottom: 0;
  }

  #tab-quiz .quiz-small-icon {
    display: inline-grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    color: var(--accent);
    background: color-mix(in srgb, var(--accent, #2563eb) 10%, #ffffff);
  }

  #tab-quiz .quiz-include-card.is-saved-groups .quiz-small-icon {
    color: #16a34a;
    background: color-mix(in srgb, #22c55e 12%, #ffffff);
  }

  #tab-quiz .quiz-include-arrow {
    position: relative;
    display: inline-grid;
    place-items: center;
    width: 30px;
    height: 30px;
    border-radius: 10px;
    color: color-mix(in srgb, var(--muted) 78%, var(--text) 22%);
    background: color-mix(in srgb, var(--surface-muted) 72%, var(--surface) 28%);
    border: 1px solid color-mix(in srgb, var(--line) 82%, transparent);
    transition: color .16s ease, background .16s ease, border-color .16s ease, transform .16s ease;
  }

  #tab-quiz .quiz-include-arrow::before {
    content: "";
    width: 9px;
    height: 9px;
    border-top: 2px solid currentColor;
    border-right: 2px solid currentColor;
    transform: translateX(-1px) rotate(45deg);
  }

  #tab-quiz .quiz-options[data-include-mode="group"] .quiz-include-card.is-code-groups,
  #tab-quiz .quiz-options[data-include-mode="saved"] .quiz-include-card.is-saved-groups {
    border-color: var(--selected-border, color-mix(in srgb, var(--accent) 42%, var(--line)));
    background: var(--quiz-soft-blue);
    box-shadow: inset 0 0 0 1px var(--selected-ring, color-mix(in srgb, var(--accent) 12%, transparent));
  }

  #tab-quiz .quiz-options[data-include-mode="group"] .quiz-include-card.is-code-groups .quiz-include-arrow,
  #tab-quiz .quiz-options[data-include-mode="saved"] .quiz-include-card.is-saved-groups .quiz-include-arrow {
    color: var(--selected-text, color-mix(in srgb, var(--accent) 76%, var(--text) 24%));
    border-color: var(--selected-border, color-mix(in srgb, var(--accent) 30%, var(--line)));
    background: var(--selected-bg, color-mix(in srgb, var(--accent) 11%, var(--surface)));
    transform: translateX(2px);
  }

  #tab-quiz .quiz-group-preview-panel {
    min-height: 306px;
    padding: 22px 24px;
  }

  #tab-quiz #quizGroupSelect {
    width: 100%;
    min-height: 190px;
    border: 0;
    border-radius: 14px;
    background: transparent;
    color: var(--text);
    font-size: 15px;
    font-weight: 760;
    outline: none;
  }

  #tab-quiz #quizGroupSelect:disabled {
    display: none;
  }

  #tab-quiz #quizGroupSelect option {
    padding: 12px 14px;
    margin: 4px 0;
    border-radius: 10px;
  }

  #tab-quiz #quizGroupSelect option:checked {
    color: var(--selected-text, var(--accent));
    background: var(--selected-bg, color-mix(in srgb, var(--accent) 14%, transparent));
  }

  #tab-quiz .quiz-saved-group-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 100%;
    min-height: 190px;
    max-height: 190px;
    padding: 2px;
    overflow-y: auto;
    color: var(--text);
    background: transparent;
    scrollbar-gutter: stable;
  }

  #tab-quiz .quiz-saved-group-list[hidden] {
    display: none;
  }

  #tab-quiz .quiz-saved-group-list-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
    min-height: 42px;
    padding: 9px 12px;
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text);
    background: transparent;
    cursor: pointer;
  }

  #tab-quiz .quiz-saved-group-list-row:hover,
  #tab-quiz .quiz-saved-group-list-row:focus-visible {
    border-color: color-mix(in srgb, var(--accent) 30%, var(--line));
    background: color-mix(in srgb, var(--accent) 7%, var(--surface));
    outline: none;
  }

  #tab-quiz .quiz-saved-group-list-row.is-selected {
    border-color: var(--selected-border, color-mix(in srgb, var(--accent) 34%, var(--line)));
    color: var(--selected-text, var(--accent));
    background: var(--selected-bg, color-mix(in srgb, var(--accent) 13%, var(--surface)));
  }

  #tab-quiz .quiz-saved-group-list-name {
    min-width: 0;
    overflow: hidden;
    font-weight: 760;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  #tab-quiz .quiz-saved-group-list-count {
    min-width: 28px;
    color: var(--muted);
    font-size: 0.86em;
    font-weight: 760;
    text-align: right;
  }

  #tab-quiz .quiz-saved-group-rename-input {
    width: 100%;
    min-width: 0;
    height: 34px;
    padding: 6px 9px;
    border: 1px solid color-mix(in srgb, var(--accent) 48%, var(--line));
    border-radius: 7px;
    color: var(--text);
    background: var(--surface);
    font: inherit;
    font-weight: 760;
    outline: none;
  }

  #tab-quiz .quiz-saved-group-rename-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 14%, transparent);
  }

  #tab-quiz .quiz-saved-group-list-empty {
    display: grid;
    min-height: 100%;
    place-items: center;
    padding: 18px;
    color: var(--muted);
    font-weight: 700;
    text-align: center;
  }

  #tab-quiz .quiz-all-preview-hint {
    display: none;
    min-height: 160px;
    align-items: center;
    gap: 14px;
    color: var(--muted);
    font-size: 15px;
    font-weight: 700;
    line-height: 1.45;
    opacity: 0.82;
  }

  #tab-quiz .quiz-options[data-include-mode="all"] .quiz-all-preview-hint {
    display: flex;
  }

  #tab-quiz .quiz-stack-line-icon {
    display: inline-grid;
    place-items: center;
    width: 32px;
    height: 32px;
    flex: 0 0 auto;
    color: color-mix(in srgb, var(--muted) 78%, var(--line) 22%);
  }

  #tab-quiz .quiz-stack-line-icon svg {
    width: 28px;
    height: 28px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  #tab-quiz .group-filter-summary {
    display: flex;
    align-items: center;
    min-height: 56px;
    margin-top: 22px;
    padding: 16px 20px 16px 58px;
    border: 1px solid color-mix(in srgb, var(--accent) 16%, var(--line));
    border-radius: 16px;
    background:
      radial-gradient(circle at 28px 50%, color-mix(in srgb, var(--accent) 20%, transparent) 0 13px, transparent 14px),
      color-mix(in srgb, var(--accent) 7%, var(--surface));
    color: var(--text);
    font-size: 15px;
    font-weight: 750;
    line-height: 1.4;
  }

  #tab-quiz .quiz-setup-actions {
    grid-template-columns: auto minmax(0, 1fr) minmax(380px, 0.78fr);
    gap: 18px;
    align-items: center;
    background: var(--surface-elevated);
    border: 1px solid var(--quiz-soft-line);
    border-radius: var(--quiz-panel-radius);
    box-shadow: var(--quiz-panel-shadow);
    padding: clamp(18px, 2.2vw, 28px);
    margin-top: 18px;
  }

  #tab-quiz .quiz-setup-copy .quiz-setup-kicker {
    margin: 0;
  }

  #tab-quiz .quiz-setup-side {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    justify-items: stretch;
    width: 100%;
    padding-left: 22px;
    border-left: 1px solid var(--quiz-soft-line);
  }

  #tab-quiz .quiz-setup-buttons {
    display: grid;
    grid-template-columns: minmax(180px, 1.08fr) minmax(168px, 0.92fr);
    gap: 12px;
    width: 100%;
  }

  #tab-quiz .quiz-setup-buttons > button {
    min-width: 0;
    min-height: 46px;
    height: 46px;
    border-radius: 12px;
    font-size: 13.5px;
    font-weight: 840;
    padding-inline: clamp(14px, 1.25vw, 20px);
  }

  #tab-quiz #quizStudySetBtn,
  #tab-quiz #quizStartBtn {
    min-width: 178px;
    min-height: 44px;
    height: 44px;
    padding-inline: 10px;
    font-size: 13.5px;
  }

  #tab-quiz .quiz-action-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    letter-spacing: 0;
    line-height: 1.1;
    white-space: nowrap;
  }

  #tab-quiz .quiz-action-button[hidden],
  #tab-quiz .quiz-mode-only[hidden] {
    display: none !important;
  }

  #tab-quiz .quiz-action-button > span {
    min-width: 0;
    text-align: center;
    white-space: nowrap;
  }

  #tab-quiz .quiz-button-icon {
    width: 18px;
    height: 18px;
    flex: 0 0 auto;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  #tab-quiz .quiz-button-icon circle {
    fill: currentColor;
    stroke: none;
  }

  #tab-quiz .quiz-button-icon-study {
    width: 17px;
  }

  #tab-quiz .quiz-setup-buttons .btn-study.quiz-action-button,
  #tab-quiz .quiz-toolbar-actions .btn-study.quiz-action-button {
    color: var(--text) !important;
    border: 1px solid color-mix(in srgb, var(--line) 80%, var(--text) 20%) !important;
    background: var(--surface) !important;
    box-shadow: none !important;
  }

  #tab-quiz .btn-study.quiz-action-button .quiz-button-icon {
    color: color-mix(in srgb, var(--muted) 80%, var(--accent) 20%);
  }

  html[data-theme="dark"] #tab-quiz {
    --quiz-soft-blue: var(--selected-bg, color-mix(in srgb, var(--accent, #60a5fa) 14%, #101827));
    --quiz-soft-line: var(--control-border, color-mix(in srgb, var(--line, #334155) 78%, transparent));
  }

  html[data-theme="dark"] #tab-quiz .quiz-options,
  html[data-theme="dark"] #tab-quiz .quiz-setup-actions,
  html[data-theme="dark"] #tab-quiz .quiz-include-card,
  html[data-theme="dark"] #tab-quiz .quiz-include-card-stack,
  html[data-theme="dark"] #tab-quiz .quiz-group-preview-panel {
    background: var(--surface-elevated);
  }

  html[data-theme="dark"] #tab-quiz .quiz-difficulty-control,
  html[data-theme="dark"] #tab-quiz .quiz-difficulty-track {
    border-color: color-mix(in srgb, var(--line, #334155) 68%, #ffffff 20%);
  }

  html[data-theme="dark"] #tab-quiz .quiz-panel-icon,
  html[data-theme="dark"] #tab-quiz .quiz-small-icon {
    background: color-mix(in srgb, currentColor 13%, var(--surface-raised));
  }

  html[data-theme="dark"] #tab-quiz .quiz-include-arrow {
    background: var(--surface-raised);
  }

  @media (max-width: 980px) {
    #tab-quiz .group-filter-grid,
    #tab-quiz .quiz-setup-actions {
      grid-template-columns: 1fr;
    }

    #tab-quiz .quiz-options > summary {
      grid-template-columns: auto minmax(0, 1fr);
    }

    #tab-quiz .quiz-setup-side {
      padding-left: 0;
      border-left: 0;
      border-top: 1px solid var(--quiz-soft-line);
      padding-top: 16px;
    }
  }

  @media (max-width: 640px) {
    #tab-quiz .quiz-options,
    #tab-quiz .quiz-setup-actions {
      border-radius: 18px;
      padding: 16px;
    }

    #tab-quiz .quiz-panel-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
    }

    #tab-quiz .quiz-options-summary-text > span:first-child,
    #tab-quiz .quiz-setup-copy .quiz-setup-kicker {
      font-size: 23px;
    }

    #tab-quiz .quiz-setup-buttons {
      gap: 8px;
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    #tab-quiz .quiz-setup-buttons > button {
      font-size: 12.5px;
      padding-inline: 8px;
    }
  }