.vca-app {
    max-width: 1120px;
    margin: 0 auto;
    padding: 24px;
    font-family: inherit;
}
.vca-app * {
    box-sizing: border-box;
}
.vca-app__view {
    display: none;
}
.vca-app__view--active {
    display: block;
}
.vca-app__hero,
.vca-app__view:not(.vca-app__hero) {
    padding: 28px;
    border: 1px solid #dcdcde;
    border-radius: 16px;
    background: #fff;
}
.vca-app__eyebrow {
    margin: 0 0 8px;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
}
.vca-app__pass,
.vca-app__lead {
    font-weight: 700;
}
.vca-app__notice {
    padding: 14px 16px;
    border-left: 4px solid currentColor;
    background: rgba(0,0,0,.04);
}
.vca-app__button,
.vca-app__link-button,
.vca-app__card {
    font: inherit;
}
.vca-app__button,
.vca-app__link-button {
    margin: 8px 8px 0 0;
    padding: 12px 18px;
    border-radius: 999px;
    border: 1px solid currentColor;
    background: #fff;
    color: inherit;
    cursor: pointer;
    text-decoration: none;
}
.vca-app__button {
    font-weight: 700;
}
.vca-app__button:hover,
.vca-app__button:focus,
.vca-app__link-button:hover,
.vca-app__link-button:focus,
.vca-app__card:hover,
.vca-app__card:focus {
    outline: 2px solid currentColor;
    outline-offset: 2px;
}
.vca-app__toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 18px;
}
.vca-app__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 24px;
}
.vca-app__card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    min-height: 160px;
    padding: 18px;
    border: 1px solid #dcdcde;
    border-radius: 14px;
    background: #fff;
    color: inherit;
    text-align: left;
    cursor: pointer;
}
.vca-app__order {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    min-width: 32px;
    height: 32px;
    border-radius: 999px;
    border: 1px solid currentColor;
    font-weight: 700;
}
.vca-app__card-title {
    font-size: 1.05rem;
    font-weight: 700;
}
.vca-app__card-text {
    font-size: .95rem;
}
.vca-app__lesson-box {
    padding: 18px;
    border: 1px solid #dcdcde;
    border-radius: 14px;
    background: rgba(0,0,0,.03);
}
.vca-app__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
}
@media (max-width: 640px) {
    .vca-app {
        padding: 16px;
    }
    .vca-app__hero,
    .vca-app__view:not(.vca-app__hero) {
        padding: 20px;
    }
    .vca-app__grid {
        grid-template-columns: 1fr;
    }
    .vca-app__button,
    .vca-app__link-button {
        width: 100%;
        margin-right: 0;
    }
}

/* Brief 4A: force category tile text visibility against theme button styles. */
.vca-app button.vca-app__card,
.vca-app .vca-app__grid button.vca-app__card {
    appearance: none;
    -webkit-appearance: none;
    background: #ffffff !important;
    color: #111827 !important;
    border-color: #dcdcde !important;
    box-shadow: none;
    opacity: 1 !important;
    visibility: visible !important;
}
.vca-app button.vca-app__card:hover,
.vca-app button.vca-app__card:focus,
.vca-app .vca-app__grid button.vca-app__card:hover,
.vca-app .vca-app__grid button.vca-app__card:focus {
    background: #f7faff !important;
    color: #111827 !important;
    border-color: #2f5aae !important;
}
.vca-app button.vca-app__card span,
.vca-app .vca-app__card .vca-app__order,
.vca-app .vca-app__card .vca-app__card-title,
.vca-app .vca-app__card .vca-app__card-text {
    color: inherit !important;
    opacity: 1 !important;
    visibility: visible !important;
}
.vca-app button.vca-app__card .vca-app__order {
    border-color: currentColor !important;
}


/* Brief 5: lesson MVP structure and mobile readability. */
.vca-app__lesson-sections {
    display: grid;
    gap: 14px;
    margin-top: 18px;
}
.vca-app__lesson-section {
    padding: 16px;
    border: 1px solid #dcdcde;
    border-radius: 14px;
    background: rgba(0,0,0,.025);
}
.vca-app__lesson-section h4 {
    margin-top: 0;
    margin-bottom: 8px;
}
.vca-app__lesson-section p {
    margin-bottom: 0;
}
.vca-app__lesson .vca-app__lead {
    line-height: 1.6;
}
@media (max-width: 640px) {
    .vca-app__lesson-section {
        padding: 14px;
    }
}

/* Brief 6: single_choice training questions MVP. */
.vca-training {
    margin-top: 22px;
}
.vca-training-question {
    padding: 18px;
    border: 1px solid #dcdcde;
    border-radius: 14px;
    background: rgba(0,0,0,.025);
}
.vca-training-question h4 {
    margin-top: 0;
    line-height: 1.4;
}
.vca-training-question__answers {
    display: grid;
    gap: 10px;
    margin: 16px 0;
}
.vca-training-question__answer {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    padding: 12px 14px;
    border: 1px solid #dcdcde;
    border-radius: 12px;
    background: #fff;
    line-height: 1.5;
    cursor: pointer;
}
.vca-training-question__answer input {
    margin-top: 4px;
}
.vca-training-question__answer:has(input:disabled) {
    cursor: default;
}
.vca-training-question__answer--selected {
    font-weight: 700;
}
.vca-training-question__answer--correct {
    border-color: currentColor;
}
.vca-training-question__answer--wrong {
    text-decoration: line-through;
}
.vca-training-question__validation,
.vca-training-question__feedback {
    font-weight: 700;
}
.vca-training-question__validation,
.vca-training-question__feedback--wrong {
    color: #8a2424;
}
.vca-training-question__feedback--correct {
    color: #14532d;
}
.vca-training-question__result {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid #dcdcde;
}
.vca-training-question__result p {
    line-height: 1.6;
}
@media (max-width: 640px) {
    .vca-training-question {
        padding: 14px;
    }
    .vca-training-question__answer {
        padding: 12px;
    }
}


/* Brief 6A: single_choice readability and theme-cache hardening. */
.vca-app .vca-training-question [hidden] {
    display: none !important;
}
.vca-app .vca-training-question__answers {
    display: flex !important;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
}
.vca-app .vca-training-question__answer {
    width: 100%;
    max-width: 100%;
}
.vca-app .vca-training-question__answer input[type="radio"] {
    flex: 0 0 auto;
}
.vca-app .vca-training-question__answer span {
    display: block;
}
.vca-app .vca-training-question button[data-vca-check-question] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
@media (max-width: 640px) {
    .vca-app .vca-training-question button[data-vca-check-question] {
        width: 100%;
    }
}

/* Brief 6B: breathing space between training question and lesson/legal notices. */
.vca-app .vca-training + .vca-app__notice,
.vca-app .vca-training-question + .vca-app__notice {
    margin-top: 24px;
}
.vca-app .vca-training + .vca-app__notice {
    margin-bottom: 22px;
}
.vca-app .vca-training-question {
    margin-bottom: 0;
}
@media (max-width: 640px) {
    .vca-app .vca-training + .vca-app__notice,
    .vca-app .vca-training-question + .vca-app__notice {
        margin-top: 20px;
    }
}

/* Brief 7: category quiz MVP v1. */
.vca-category-quiz__stage[hidden],
.vca-category-quiz__question[hidden],
.vca-category-quiz__mistakes[hidden] {
    display: none !important;
}
.vca-category-quiz__summary {
    display: grid;
    gap: 12px;
    margin: 18px 0;
}
.vca-category-quiz__summary div {
    padding: 14px 16px;
    border: 1px solid #dcdcde;
    border-radius: 12px;
    background: rgba(0,0,0,.025);
}
.vca-category-quiz__summary dt {
    margin: 0 0 4px;
    font-weight: 700;
}
.vca-category-quiz__summary dd {
    margin: 0;
}
.vca-category-quiz__question {
    padding: 18px;
    border: 1px solid #dcdcde;
    border-radius: 14px;
    background: rgba(0,0,0,.025);
}
.vca-category-quiz__counter {
    margin-top: 0;
    font-weight: 700;
}
.vca-category-quiz__mistakes {
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid #dcdcde;
}
.vca-category-quiz__mistake {
    padding: 16px;
    border: 1px solid #dcdcde;
    border-radius: 14px;
    background: rgba(0,0,0,.025);
}
.vca-category-quiz__mistake + .vca-category-quiz__mistake {
    margin-top: 14px;
}
.vca-category-quiz__mistake p {
    line-height: 1.6;
}
.vca-category-quiz__answer {
    display: inline-block;
    margin-top: 6px;
    padding: 9px 13px;
    border: 2px solid currentColor;
    border-radius: 14px;
    background: #fff;
    font-weight: 500;
}
.vca-category-quiz__answer--wrong {
    color: #8a2424;
    background: #fff5f5;
}
.vca-category-quiz__answer--correct {
    color: #14532d;
    background: #f3fff6;
}
@media (max-width: 640px) {
    .vca-category-quiz__question,
    .vca-category-quiz__mistake {
        padding: 14px;
    }
}

/* Brief 7B: category quiz polish and mobile handoff readiness. */
.vca-category-quiz {
    max-width: 100%;
    overflow-wrap: anywhere;
}
.vca-category-quiz .vca-training-question__answers {
    display: flex !important;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
}
.vca-category-quiz .vca-training-question__answer {
    display: flex;
    width: 100%;
    max-width: 100%;
    padding: 12px;
    margin-bottom: 0;
}
.vca-category-quiz .vca-app__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}
.vca-category-quiz .vca-app__actions button {
    min-height: 44px;
}
.vca-category-quiz .vca-app__notice {
    margin-top: 18px;
    margin-bottom: 18px;
}
.vca-category-quiz__summary div {
    min-width: 0;
}
.vca-category-quiz__answer {
    max-width: 100%;
    white-space: normal;
}
.vca-category-quiz__mistake-actions {
    margin-top: 18px;
}
@media (max-width: 600px) {
    .vca-category-quiz .vca-app__actions {
        flex-direction: column;
    }
    .vca-category-quiz .vca-app__actions button {
        width: 100%;
        margin-right: 0;
    }
    .vca-category-quiz__summary {
        gap: 10px;
    }
    .vca-category-quiz__summary div,
    .vca-category-quiz__question,
    .vca-category-quiz__mistake {
        padding: 14px;
    }
}

/* Brief 9: mistake review MVP. */
.vca-category-quiz__review {
    margin-top: 22px;
    padding: 18px;
    border: 1px solid #dcdcde;
    border-radius: 14px;
    background: rgba(0,0,0,.025);
}
.vca-category-quiz__review h4 {
    margin-top: 0;
    line-height: 1.4;
}
.vca-category-quiz__review-count,
.vca-category-quiz__review-result {
    margin-top: 14px;
}
.vca-category-quiz__review-result {
    padding-top: 14px;
    border-top: 1px solid #dcdcde;
}
.vca-category-quiz__review .vca-training-question__answer--correct {
    border-color: #14532d;
    background: rgba(20,83,45,.08);
    color: #14532d;
}
.vca-category-quiz__review .vca-training-question__answer--wrong {
    border-color: #8a2424;
    background: rgba(138,36,36,.08);
    color: #8a2424;
    text-decoration: none;
}
@media (max-width: 640px) {
    .vca-category-quiz__review {
        padding: 14px;
    }
    .vca-category-quiz__review .vca-app__actions {
        gap: 10px;
    }
}