/* Shared academic styles: the document is a vertical flow, never a column layout. */
.course-theory {
    --lesson-text: #28364b;
    --lesson-heading: #142b50;
    --lesson-muted: #53657c;
    --lesson-border: #dce5ef;
    --lesson-primary: #1764bc;
    --lesson-surface: #fff;
    --lesson-subtle-bg: #f8fafc;
    --lesson-example-bg: #edf9f9;
    --lesson-important-accent: #b42e67;
    --lesson-warning-accent: #956000;
    --lesson-success-accent: #177747;
    --lesson-purple-accent: #7052ad;
    --lesson-example-accent: #177a7a;
    --lesson-info-bg: #edf5ff;
    --lesson-success-bg: #edf9f2;
    --lesson-warning-bg: #fff7e6;
    --lesson-danger-bg: #fff0f3;
    --lesson-purple-bg: #f4efff;
    --lesson-highlight-yellow: #fff0a6;
    --lesson-highlight-blue: #dbeeff;
    --lesson-highlight-green: #d9f3df;
    --lesson-highlight-pink: #fce0ed;
    --lesson-radius-sm: 0.25rem;
    --lesson-radius-md: 0.625rem;
    --lesson-radius-lg: 0.875rem;
    --lesson-spacing-xs: 0.375rem;
    --lesson-spacing-sm: 0.75rem;
    --lesson-spacing-md: 1.25rem;
    --lesson-spacing-lg: 2rem;
    --lesson-spacing-xl: 2.75rem;
    box-sizing: border-box;
    display: block;
    columns: auto;
    max-width: 68rem;
    margin-inline: auto;
    padding: clamp(1rem, 3vw, 2.5rem);
    border: 1px solid var(--lesson-border);
    border-radius: var(--lesson-radius-lg);
    background: var(--lesson-surface);
    color: var(--lesson-text);
    font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.75;
    overflow-wrap: anywhere;
}

.course-theory .course-theory {
    max-width: none;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
}

.course-theory *, .course-theory *::before, .course-theory *::after {
    box-sizing: border-box;
}
.course-theory :is(h1, h2, h3, h4) {
    margin: var(--lesson-spacing-lg) 0 var(--lesson-spacing-sm);
    color: var(--lesson-heading);
    font-weight: 750;
    line-height: 1.35;
    text-wrap: balance;
}
.course-theory h1 {
    font-size: clamp(1.55rem, 2.8vw, 2rem);
    letter-spacing: -0.025em;
}
.course-theory h2 {
    font-size: clamp(1.3rem, 2vw, 1.55rem);
}
.course-theory h3 {
    font-size: 1.2rem;
}
.course-theory h4 {
    font-size: 1.0625rem;
}
.course-theory :is(p, ul, ol, dl, blockquote) {
    margin: 0 0 var(--lesson-spacing-md);
}
.course-theory :is(p, blockquote) {
    max-width: 78ch;
}
.course-theory strong, .course-theory b {
    font-weight: 750;
    color: var(--lesson-heading);
}
.course-theory em, .course-theory i {
    font-style: italic;
}
.course-theory small {
    font-size: 0.875em;
    color: var(--lesson-muted);
}
.course-theory ul {
    padding-left: 1.5rem;
    list-style: disc;
}
.course-theory ol {
    padding-left: 1.5rem;
    list-style: decimal;
}
.course-theory li + li {
    margin-top: var(--lesson-spacing-xs);
}
.course-theory li::marker {
    color: var(--lesson-primary);
    font-weight: 650;
}
.course-theory dt {
    font-weight: 750;
    color: var(--lesson-heading);
}
.course-theory dd {
    margin: 0 0 var(--lesson-spacing-sm);
}
.course-theory a {
    color: var(--lesson-primary);
    text-decoration: underline;
    text-underline-offset: 0.2em;
}
.course-theory a:focus-visible, .course-theory [tabindex]:focus-visible {
    outline: 3px solid var(--lesson-primary);
    outline-offset: 3px;
}
.course-theory blockquote {
    padding-left: var(--lesson-spacing-md);
    border-left: 3px solid var(--lesson-border);
    color: var(--lesson-muted);
}
.course-theory hr {
    margin-block: var(--lesson-spacing-lg);
    border: 0;
    border-top: 1px solid var(--lesson-border);
}
.course-theory code {
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 0.9375em;
}
.course-theory pre {
    margin-block: var(--lesson-spacing-md);
    padding: var(--lesson-spacing-md);
    overflow-x: auto;
    background: var(--lesson-info-bg);
    border-radius: var(--lesson-radius-md);
    white-space: pre;
}
.course-theory .lesson-lead {
    max-width: 78ch;
    font-size: 1.125rem;
    color: var(--lesson-muted);
    line-height: 1.8;
}
.course-theory .lesson-section {
    margin-top: var(--lesson-spacing-xl);
}
.course-theory .lesson-subsection {
    margin-top: var(--lesson-spacing-lg);
}
.course-theory > :first-child, .course-theory .lesson-section > :first-child, .course-theory .lesson-subsection > :first-child {
    margin-top: 0;
}

.course-theory mark {
    padding: 0.05em 0.18em;
    border-radius: var(--lesson-radius-sm);
    background: var(--lesson-highlight-yellow);
    color: inherit;
    box-decoration-break: clone;
    -webkit-box-decoration-break: clone;
}
.course-theory .highlight-yellow {
    background: var(--lesson-highlight-yellow);
}
.course-theory .highlight-blue {
    background: var(--lesson-highlight-blue);
}
.course-theory .highlight-green {
    background: var(--lesson-highlight-green);
}
.course-theory .highlight-pink {
    background: var(--lesson-highlight-pink);
}

.course-theory :is(.lesson-key-idea, .lesson-important, .lesson-warning, .lesson-remember, .lesson-definition, .lesson-example, .lesson-clinical-example, .lesson-study-data, .lesson-summary, .lesson-key-points, .lesson-references) {
    --lesson-block-accent: var(--lesson-primary);
    margin-block: var(--lesson-spacing-md);
    padding: var(--lesson-spacing-md);
    border: 1px solid var(--lesson-border);
    border-left: 4px solid var(--lesson-block-accent);
    border-radius: var(--lesson-radius-md);
    background: var(--lesson-info-bg);
    break-inside: avoid;
}
.course-theory :is(.lesson-key-idea, .lesson-important, .lesson-warning, .lesson-remember, .lesson-definition, .lesson-example, .lesson-clinical-example, .lesson-study-data, .lesson-summary, .lesson-key-points, .lesson-references) > :first-child {
    margin-top: 0;
}
.course-theory :is(.lesson-key-idea, .lesson-important, .lesson-warning, .lesson-remember, .lesson-definition, .lesson-example, .lesson-clinical-example, .lesson-study-data, .lesson-summary, .lesson-key-points, .lesson-references) > :last-child {
    margin-bottom: 0;
}
.course-theory :is(.lesson-key-idea, .lesson-important, .lesson-warning, .lesson-remember, .lesson-definition, .lesson-example, .lesson-clinical-example) > strong:first-child {
    display: block;
    margin-bottom: var(--lesson-spacing-xs);
    font-size: 1.0625rem;
}
.course-theory :is(.lesson-key-idea, .lesson-important, .lesson-warning, .lesson-remember, .lesson-definition, .lesson-example, .lesson-clinical-example, .lesson-study-data, .lesson-summary, .lesson-key-points) > :is(strong, h2, h3):first-child {
    color: var(--lesson-block-accent);
}
.course-theory :is(.lesson-study-data, .lesson-summary, .lesson-key-points, .lesson-references) > :is(h2, h3) {
    font-size: 1.1875rem;
}
.course-theory .lesson-important {
    --lesson-block-accent: var(--lesson-important-accent);
    background: var(--lesson-danger-bg);
}
.course-theory .lesson-warning {
    --lesson-block-accent: var(--lesson-warning-accent);
    background: var(--lesson-warning-bg);
}
.course-theory .lesson-remember {
    --lesson-block-accent: var(--lesson-success-accent);
    background: var(--lesson-success-bg);
}
.course-theory .lesson-definition, .course-theory .lesson-clinical-example {
    --lesson-block-accent: var(--lesson-purple-accent);
    background: var(--lesson-purple-bg);
}
.course-theory .lesson-example {
    --lesson-block-accent: var(--lesson-example-accent);
    background: var(--lesson-example-bg);
}
.course-theory .lesson-study-data {
    --lesson-block-accent: var(--lesson-warning-accent);
    background: var(--lesson-warning-bg);
}
.course-theory .lesson-key-points {
    --lesson-block-accent: var(--lesson-success-accent);
    margin-top: var(--lesson-spacing-xl);
    background: var(--lesson-success-bg);
}
.course-theory .lesson-references {
    padding: 0;
    width: 100%;
    min-width: 0;
    background: var(--lesson-info-bg);
    color: var(--lesson-muted);
    font-size: 0.9375rem;
}
.course-theory .lesson-references__summary {
    display: flex;
    align-items: center;
    gap: var(--lesson-spacing-sm);
    width: 100%;
    padding: var(--lesson-spacing-md);
    border-radius: var(--lesson-radius-md);
    cursor: pointer;
    list-style: none;
    transition: background-color .2s ease, box-shadow .2s ease;
}
.course-theory .lesson-references__summary::marker {
    content: "";
}
.course-theory .lesson-references__summary::-webkit-details-marker {
    display: none;
}
.course-theory .lesson-references__summary:hover {
    background: var(--lesson-highlight-blue);
    box-shadow: inset 0 0 0 1px var(--lesson-border);
}
.course-theory .lesson-references__summary:focus-visible {
    outline: 3px solid var(--lesson-primary);
    outline-offset: 3px;
}
.course-theory .lesson-references__icon {
    display: grid;
    place-items: center;
    flex: 0 0 2.5rem;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    color: var(--lesson-primary);
    background: var(--lesson-highlight-blue);
}
.course-theory .lesson-references__icon::before {
    content: "\f518";
    font-family: "Font Awesome 6 Pro", "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 1.125rem;
}
.course-theory .lesson-references__heading {
    display: block;
    flex: 1;
    min-width: 0;
    line-height: 1.5;
}
.course-theory .lesson-references__heading > strong {
    display: block;
    font-size: 1rem;
}
.course-theory .lesson-references__meta {
    display: block;
    margin-top: var(--lesson-spacing-xs);
    color: var(--lesson-muted);
    font-size: 0.875rem;
}
.course-theory .lesson-references__chevron {
    flex: 0 0 0.625rem;
    width: 0.625rem;
    height: 0.625rem;
    margin-inline: var(--lesson-spacing-xs);
    border-right: 2px solid var(--lesson-primary);
    border-bottom: 2px solid var(--lesson-primary);
    transform: rotate(45deg);
    transition: transform .2s ease;
}
.course-theory .lesson-references[open] > .lesson-references__summary .lesson-references__chevron {
    transform: rotate(225deg);
}
.course-theory .lesson-references__content {
    padding: var(--lesson-spacing-md);
    border-top: 1px solid var(--lesson-border);
    background: var(--lesson-subtle-bg);
    border-radius: 0 0 var(--lesson-radius-md) var(--lesson-radius-md);
    overflow-wrap: anywhere;
}
.course-theory .lesson-references__content > :last-child {
    margin-bottom: 0;
}
.course-theory .lesson-reference-list {
    padding-left: var(--lesson-spacing-md);
    margin: 0;
    list-style: disc;
}
.course-theory .lesson-reference {
    margin-block: var(--lesson-spacing-sm);
    font-size: 0.9375rem;
    color: var(--lesson-muted);
}
.course-theory .lesson-reference p {
    margin-bottom: var(--lesson-spacing-xs);
}

@media (prefers-reduced-motion: reduce) {
    .course-theory :is(.lesson-references__summary, .lesson-references__chevron) {
        transition: none;
    }
}

/* Only small components may have an internal grid; no grid is applied to sections. */
.course-theory .lesson-concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr));
    gap: var(--lesson-spacing-sm);
    margin-block: var(--lesson-spacing-md);
}
.course-theory .lesson-concept-card {
    padding: var(--lesson-spacing-md);
    border: 1px solid var(--lesson-border);
    border-radius: var(--lesson-radius-md);
    background: var(--lesson-subtle-bg);
    break-inside: avoid;
}
.course-theory .lesson-concept-card > :first-child {
    margin-top: 0;
}
.course-theory .lesson-concept-card > :last-child {
    margin-bottom: 0;
}
.course-theory .lesson-concept-card h3, .course-theory .lesson-concept-card h4 {
    font-size: 1.0625rem;
}
.course-theory .lesson-comparison {
    margin-block: var(--lesson-spacing-md);
}

.course-theory .lesson-table {
    max-width: 100%;
    margin-block: var(--lesson-spacing-md);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    border-radius: var(--lesson-radius-md);
}
.course-theory table {
    display: block;
    max-width: 100%;
    overflow-x: auto;
    width: 100%;
    margin-block: var(--lesson-spacing-sm);
    border-collapse: collapse;
    font-size: 0.9375rem;
    line-height: 1.6;
    break-inside: avoid;
}
.course-theory .lesson-table table {
    display: table;
}
/* A bare table is also scrollable, but a labelled .lesson-table wrapper is preferred. */
.course-theory table.lesson-table {
    display: block;
}
.course-theory :is(th, td) {
    min-width: 9rem;
    padding: var(--lesson-spacing-sm);
    border: 1px solid var(--lesson-border);
    text-align: left;
    vertical-align: top;
}
.course-theory th {
    color: var(--lesson-heading);
    font-weight: 750;
}
.course-theory thead {
    background: var(--lesson-info-bg);
}
.course-theory tbody tr:nth-child(even) {
    background: var(--lesson-subtle-bg);
}
.course-theory caption {
    padding-bottom: var(--lesson-spacing-sm);
    text-align: left;
    color: var(--lesson-muted);
    font-weight: 650;
}

.course-theory .lesson-steps {
    list-style: none;
    padding: 0;
    counter-reset: lesson-step;
}
.course-theory .lesson-step {
    position: relative;
    counter-increment: lesson-step;
    margin-bottom: var(--lesson-spacing-sm);
    padding: var(--lesson-spacing-sm) var(--lesson-spacing-md) var(--lesson-spacing-sm) 3.75rem;
    border: 1px solid var(--lesson-border);
    border-radius: var(--lesson-radius-md);
    background: var(--lesson-subtle-bg);
    break-inside: avoid;
}
.course-theory .lesson-step::before {
    content: counter(lesson-step);
    position: absolute;
    top: var(--lesson-spacing-sm);
    left: var(--lesson-spacing-sm);
    display: grid;
    place-items: center;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    background: var(--lesson-info-bg);
    color: var(--lesson-primary);
    font-weight: 750;
}
.course-theory .lesson-step > :last-child {
    margin-bottom: 0;
}
.course-theory .lesson-timeline {
    padding: 0 0 0 var(--lesson-spacing-md);
    border-left: 3px solid var(--lesson-border);
    list-style: none;
}
.course-theory .lesson-timeline > li {
    position: relative;
    padding-bottom: var(--lesson-spacing-sm);
}
.course-theory .lesson-timeline > li::before {
    content: "";
    position: absolute;
    left: calc(-1 * var(--lesson-spacing-md) - 0.45rem);
    top: 0.55rem;
    width: 0.75rem;
    height: 0.75rem;
    border: 2px solid var(--lesson-surface);
    border-radius: 50%;
    background: var(--lesson-primary);
}
.course-theory .lesson-timeline time {
    display: block;
    color: var(--lesson-primary);
    font-weight: 750;
}

.course-theory :is(.lesson-figure, .lesson-diagram) {
    margin: var(--lesson-spacing-lg) 0;
    padding: var(--lesson-spacing-sm);
    border: 1px solid var(--lesson-border);
    border-radius: var(--lesson-radius-md);
    break-inside: avoid;
}
.course-theory img {
    display: block;
    max-width: 100%;
    width: 100%;
    height: auto;
    border-radius: var(--lesson-radius-sm);
}
.course-theory :is(figcaption, .lesson-caption) {
    margin-top: var(--lesson-spacing-sm);
    color: var(--lesson-muted);
    font-size: 0.875rem;
    line-height: 1.6;
}

@media (max-width: 640px) {
    .course-theory {
        padding: 1rem;
    }
    .course-theory .lesson-lead {
        font-size: 1.0625rem;
    }
    .course-theory .lesson-concept-grid {
        grid-template-columns: 1fr;
    }
    .course-theory :is(.lesson-key-idea, .lesson-important, .lesson-warning, .lesson-remember, .lesson-definition, .lesson-example, .lesson-clinical-example, .lesson-study-data, .lesson-summary, .lesson-key-points, .lesson-references) {
        padding: var(--lesson-spacing-sm);
    }
    .course-theory .lesson-references {
        padding: 0;
    }
    .course-theory :is(.lesson-references__summary, .lesson-references__content) {
        padding: var(--lesson-spacing-sm);
    }
}

@media print {
    .course-theory {
        max-width: none;
        padding: 0;
        border: 0;
        font-size: 11pt;
        color: #000;
    }
    .course-theory :is(h1, h2, h3, h4) {
        break-after: avoid;
        color: #000;
    }
    .course-theory :is(.lesson-key-idea, .lesson-important, .lesson-warning, .lesson-remember, .lesson-definition, .lesson-example, .lesson-clinical-example, .lesson-study-data, .lesson-summary, .lesson-key-points, .lesson-references, .lesson-concept-card, pre) {
        background: transparent;
    }
    .course-theory .lesson-table {
        overflow: visible;
    }
    .course-theory table {
        display: table;
        overflow: visible;
    }
    .course-theory :is(th, td) {
        min-width: 0;
    }
    .course-theory thead {
        display: table-header-group;
        background: transparent;
    }
    .course-theory a {
        color: #000;
    }
    /* Native details content is visible in print even when collapsed on screen. */
    .course-theory .lesson-references::details-content {
        content-visibility: visible;
        display: block;
        height: auto;
    }
    .course-theory .lesson-references {
        break-inside: auto;
    }
    .course-theory .lesson-references__summary {
        padding: var(--lesson-spacing-sm);
        background: transparent;
        break-after: avoid;
    }
    .course-theory :is(.lesson-references__icon, .lesson-references__chevron) {
        display: none;
    }
    .course-theory .lesson-references__content {
        background: transparent;
        padding: var(--lesson-spacing-sm);
    }
    .course-theory .lesson-reference {
        break-inside: avoid;
    }
}