/* Lesson reading surfaces: content first, chrome only for truly important ideas. */
#lessonContent,
#answersContent,
#solutionContent {
    padding: 0 !important;
}

#lessonContent .lesson,
#lessonContent .card,
#lessonContent .kbox,
#lessonContent .okbox,
#lessonContent .warnbox,
#lessonContent .eq,
#lessonContent details,
#answersContent .item-row,
#answersContent .card,
#answersContent .answer,
#solutionContent .item-row,
#solutionContent .card,
#solutionContent .solution,
#solutionContent details,
.formula-content {
    border: 0 !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    background: transparent !important;
    padding: 0 !important;
}

#lessonContent .lesson,
#lessonContent .card,
#lessonContent .kbox,
#lessonContent .okbox,
#lessonContent .warnbox,
#lessonContent .eq,
#lessonContent details {
    margin-left: 0 !important;
    margin-right: 0 !important;
}

#answersContent .item-row,
#solutionContent .item-row {
    margin: 0.55rem 0 !important;
}

/* New Clasa 9 lessons deliberately opt in to a border only for essential material. */
#lessonContent .lesson-important,
#lessonContent .lesson-definition,
#lessonContent .lesson-rule,
#lessonContent .lesson-warning {
    border: 1px solid var(--color-border-contrast, currentColor) !important;
    border-radius: 10px !important;
    background: transparent !important;
    box-shadow: none !important;
    padding: 0.8rem 0.95rem !important;
    margin: 1rem 0 !important;
}

#lessonContent .lesson-important > :first-child,
#lessonContent .lesson-definition > :first-child,
#lessonContent .lesson-rule > :first-child,
#lessonContent .lesson-warning > :first-child {
    margin-top: 0 !important;
}

#lessonContent .lesson-important > :last-child,
#lessonContent .lesson-definition > :last-child,
#lessonContent .lesson-rule > :last-child,
#lessonContent .lesson-warning > :last-child {
    margin-bottom: 0 !important;
}

#lessonContent .lesson-flow {
    padding: 0 !important;
    margin: 0 !important;
}

#lessonContent .lesson-section {
    margin: 1.25rem 0 0 !important;
    padding: 0 !important;
    border: 0 !important;
    background: transparent !important;
    box-shadow: none !important;
}

#lessonContent .worked-example,
#lessonContent .quick-check {
    margin: 1rem 0 !important;
    padding: 0 !important;
    border: 0 !important;
    background: transparent !important;
    box-shadow: none !important;
}

#lessonContent .worked-example ol,
#lessonContent .worked-example ul,
#lessonContent .quick-check ol,
#lessonContent .quick-check ul {
    padding-left: 1.25rem;
}

/* The annex itself is supplementary, so it should not look like another card. */
.formula-content {
    margin-top: 0.45rem !important;
    font-style: normal !important;
}

/* Cl9 presentation refinements: quick answers, inline MathJax, and geometry visuals. */
#lessonContent .quick-check-list > li {
    margin: 0.7rem 0;
}

#lessonContent .quick-question {
    display: inline;
}

#lessonContent details.quick-answer {
    margin: 0.28rem 0 0 !important;
    padding: 0 !important;
    border: 0 !important;
    background: transparent !important;
}

#lessonContent details.quick-answer > summary {
    display: list-item;
    width: fit-content;
    cursor: pointer;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 0.18em;
    opacity: 0.86;
}

#lessonContent .quick-answer-content {
    margin-top: 0.28rem;
}

#lessonContent .quick-answer-content > :first-child {
    margin-top: 0;
}

#lessonContent .quick-answer-content > :last-child {
    margin-bottom: 0;
}

/* Cl9 uses inline \( ... \) math. Keep the rendered MathJax box in the text flow. */
#lessonContent mjx-container[jax="CHTML"]:not([display="true"]),
#answersContent mjx-container[jax="CHTML"]:not([display="true"]),
#solutionContent mjx-container[jax="CHTML"]:not([display="true"]) {
    display: inline-block !important;
    margin: 0 0.07em !important;
    vertical-align: -0.08em;
}

/* Lightweight self-contained geometry diagrams. */
#lessonContent .lesson-visual {
    margin: 1.15rem 0;
    padding: 0;
    border: 0;
    background: transparent;
    text-align: center;
}

#lessonContent .lesson-visual svg {
    display: block;
    width: min(100%, 540px);
    height: auto;
    margin: 0 auto;
    overflow: visible;
}

#lessonContent .lesson-visual figcaption {
    max-width: 620px;
    margin: 0.45rem auto 0;
    font-size: 0.92em;
    line-height: 1.45;
    opacity: 0.78;
}