.programming-catalog,
.programming-topic-detail {
    --curriculum-surface: #172235;
    --curriculum-border: #334155;
    --curriculum-text: #e2e8f0;
    --curriculum-muted: #a5b4c8;
    --curriculum-accent: #6ee7b7;
    --curriculum-hover: rgba(16, 185, 129, 0.09);
    --curriculum-heading: rgba(16, 185, 129, 0.045);
    color: var(--curriculum-text);
    line-height: 1.65;
}

.light-mode .programming-catalog,
.light-mode .programming-topic-detail {
    --curriculum-surface: #fff8e9;
    --curriculum-border: #ded2bc;
    --curriculum-text: #342f27;
    --curriculum-muted: #6b6254;
    --curriculum-accent: #27634e;
    --curriculum-hover: #e6eedf;
    --curriculum-heading: #f2e7d1;
}

.programming-catalog .curriculum-heading {
    margin: 0 0 24px;
}

.programming-catalog .curriculum-sections-nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin: 20px 0 24px;
}

.programming-catalog .curriculum-sections-nav a {
    padding: 16px;
    border: 1px solid var(--curriculum-border);
    border-radius: 12px;
    background: var(--curriculum-surface);
    color: var(--curriculum-text);
    font-size: 0.8125rem;
    text-decoration: none;
    overflow-wrap: anywhere;
}

.programming-catalog .curriculum-sections-nav span {
    display: block;
    margin-bottom: 6px;
    color: var(--curriculum-accent);
    font-size: 0.75rem;
    font-weight: 600;
}

.programming-catalog .curriculum-section {
    margin-top: 36px;
    scroll-margin-top: 100px;
}

.programming-catalog .curriculum-section + .curriculum-section {
    margin-top: 48px;
}

.programming-catalog .curriculum-reference {
    margin-top: 32px;
}

.programming-catalog .curriculum-eyebrow,
.programming-topic-detail .curriculum-eyebrow {
    margin: 0 0 8px;
    color: var(--curriculum-accent);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
}

.programming-catalog .curriculum-heading h2 {
    margin: 0 0 8px;
    font-size: clamp(1.375rem, 3vw, 1.875rem);
    font-weight: 600;
    line-height: 1.35;
}

.programming-catalog .curriculum-summary,
.programming-topic-detail .curriculum-summary {
    margin: 0;
    color: var(--curriculum-muted);
    font-size: 0.875rem;
}

.programming-catalog .curriculum-introduction {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
    padding: 17px 22px;
    border: 1px solid var(--curriculum-border);
    border-radius: 12px;
    background: var(--curriculum-surface);
    color: var(--curriculum-text);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
}

.programming-catalog .curriculum-chapters {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: 20px;
}

.programming-catalog .curriculum-chapter {
    min-width: 0;
    border: 1px solid var(--curriculum-border);
    border-radius: 14px;
    background: var(--curriculum-surface);
    scroll-margin-top: 100px;
}

.programming-catalog .curriculum-chapter > header {
    padding: 20px 22px 18px;
    border-bottom: 1px solid var(--curriculum-border);
    border-radius: 14px 14px 0 0;
    background: var(--curriculum-heading);
}

.programming-catalog .chapter-number {
    display: block;
    margin-bottom: 6px;
    color: var(--curriculum-accent);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.045em;
}

.programming-catalog .curriculum-chapter h3 {
    margin: 0;
    font-size: 1.0625rem;
    font-weight: 600;
    line-height: 1.5;
    overflow-wrap: anywhere;
}

.programming-catalog .curriculum-topic-list {
    margin: 0;
    padding: 5px 0;
    list-style: none;
}

.programming-catalog .curriculum-topic-list > li + li {
    border-top: 1px solid var(--curriculum-border);
}

.programming-catalog .curriculum-topic {
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 10px;
    padding: 16px 22px;
    color: var(--curriculum-text);
    font-size: 0.8125rem;
    line-height: 1.75;
    text-decoration: none;
    transition: background-color 150ms ease;
}

.programming-catalog .curriculum-topic-number {
    color: var(--curriculum-muted);
    font-size: 0.75rem;
    font-variant-numeric: tabular-nums;
}

.programming-catalog .curriculum-topic-name {
    min-width: 0;
    overflow-wrap: anywhere;
}

.programming-catalog .curriculum-problem-count {
    display: block;
    margin-top: 4px;
    color: var(--curriculum-accent);
    font-size: 0.75rem;
}

.programming-catalog .curriculum-topic:hover,
.programming-catalog .curriculum-introduction:hover,
.programming-catalog .curriculum-sections-nav a:hover,
.programming-topic-detail .curriculum-navigation a:hover {
    background: var(--curriculum-hover);
}

.programming-catalog a:focus-visible,
.programming-topic-detail a:focus-visible,
.legacy-topics a.topic-card:focus-visible {
    outline: 3px solid #3b82f6;
    outline-offset: 3px;
    border-radius: 6px;
}

.programming-catalog .curriculum-topic.curriculum-chapter-link {
    grid-template-columns: minmax(0, 1fr);
}

.legacy-topics {
    margin-top: 48px;
}

.legacy-topics > h2 {
    margin: 0 0 4px;
    font-size: 1.375rem;
    font-weight: 600;
}

.legacy-topics a.topic-card {
    color: inherit;
    text-decoration: none;
}

.programming-topic-detail {
    max-width: 1120px;
    margin: 0 auto;
    padding: 8px 0 24px;
}

.programming-topic-detail .back-button {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    min-height: 28px;
    margin: 0 0 24px;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--curriculum-accent);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
}
.programming-topic-detail .back-button:hover { color: #36d8b3; }

.programming-topic-detail .curriculum-breadcrumb {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 7px 12px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    margin: 0 0 16px;
    padding: 0;
    color: var(--curriculum-muted);
    font-size: 0.875rem;
    overflow-wrap: anywhere;
}

.programming-topic-detail .curriculum-breadcrumb > * {
    min-width: 0;
    max-width: 100%;
}

.programming-topic-detail .curriculum-breadcrumb a {
    border-radius: 3px;
    color: inherit;
    text-decoration: none;
    text-underline-offset: 4px;
}

.programming-topic-detail .curriculum-breadcrumb a:hover {
    color: var(--curriculum-accent);
    text-decoration: underline;
}

.programming-topic-detail .curriculum-breadcrumb a:focus-visible {
    outline: 2px solid var(--curriculum-accent);
    outline-offset: 3px;
}

.programming-topic-detail .curriculum-breadcrumb [aria-hidden="true"] {
    opacity: 0.6;
}

.programming-topic-detail .curriculum-detail-heading {
    max-width: 960px;
    margin-bottom: 30px;
    padding: 0;
    border: 0;
}

.programming-topic-detail .curriculum-detail-heading .curriculum-eyebrow { margin-bottom: 12px; font-size: 0.8125rem; letter-spacing: 1.7px; }
.programming-topic-detail .curriculum-detail-heading h1 {
    margin: 0 0 16px;
    color: var(--curriculum-text);
    font-size: 42px;
    font-weight: 700;
    line-height: 1.2;
    overflow-wrap: anywhere;
}
.programming-topic-detail .curriculum-detail-heading .curriculum-summary { color: var(--curriculum-muted); font-size: 1rem; line-height: 1.6; }

.programming-topic-detail .curriculum-problems {
    margin-top: 0;
}

.programming-topic-detail .curriculum-problems > h2 {
    margin: 0 0 16px;
    font-size: 1.25rem;
    font-weight: 600;
}

.programming-topic-detail .curriculum-problems-count {
    display: inline-block;
    margin-left: 8px;
    padding: 2px 10px;
    border-radius: 20px;
    background: var(--curriculum-hover);
    color: var(--curriculum-accent);
    font-size: 0.8125rem;
    font-weight: 500;
    vertical-align: middle;
}

.programming-topic-detail .curriculum-empty,
.programming-topic-detail .curriculum-introduction-content,
.programming-topic-detail .book-front-matter-card,
.programming-topic-detail .curriculum-problem {
    border: 1px solid var(--curriculum-border);
    border-radius: 14px;
    background: var(--curriculum-surface);
}

.programming-topic-detail .curriculum-empty,
.programming-topic-detail .curriculum-introduction-content,
.programming-topic-detail .book-front-matter-card,
.programming-topic-detail .curriculum-problem-link {
    padding: 28px;
}

.programming-topic-detail .book-front-matter-card {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 18px;
    border-left: 4px solid var(--curriculum-accent);
}

.programming-topic-detail .book-front-citation p {
    margin: 0;
    color: var(--curriculum-text);
    font-size: 1.0625rem;
    line-height: 1.7;
    font-weight: 600;
}

.programming-topic-detail .book-front-annotation p {
    margin: 0;
    color: var(--curriculum-text);
    font-size: 0.95rem;
    line-height: 1.8;
    text-align: justify;
    text-indent: 1.25rem;
}

.programming-topic-detail .book-front-reviewers {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 12px;
    padding: 14px 18px;
    background: var(--curriculum-heading);
    border-radius: 10px;
    border: 1px solid var(--curriculum-border);
}

.programming-topic-detail .reviewers-label {
    font-weight: 700;
    color: var(--curriculum-accent);
    font-size: 0.9375rem;
}

.programming-topic-detail .reviewers-list p {
    margin: 0;
    color: var(--curriculum-text);
    font-size: 0.9rem;
    line-height: 1.6;
}

.programming-topic-detail .reviewers-list p + p {
    margin-top: 8px;
}

.programming-topic-detail .book-front-recommendation p {
    margin: 0;
    color: var(--curriculum-muted);
    font-size: 0.9375rem;
    line-height: 1.6;
    font-style: italic;
}

.programming-topic-detail .book-front-isbn {
    color: var(--curriculum-accent);
    font-size: 0.9375rem;
    letter-spacing: 0.5px;
}

.programming-topic-detail .introduction-text-title {
    margin: 0 0 16px;
    color: var(--curriculum-accent);
    font-size: 1.125rem;
    font-weight: 600;
}

.programming-topic-detail .curriculum-introduction-content p {
    margin: 0;
    color: var(--curriculum-text);
    font-size: 1rem;
    line-height: 1.85;
    text-align: justify;
    text-indent: 1.5rem;
}

.programming-topic-detail .curriculum-introduction-content p + p {
    margin-top: 16px;
}

.programming-topic-detail .curriculum-references-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.programming-topic-detail .curriculum-reference-block {
    padding: 24px 28px;
    border: 1px solid var(--curriculum-border);
    border-radius: 14px;
    background: var(--curriculum-surface);
}

.programming-topic-detail .reference-subtitle {
    margin: 0 0 16px;
    color: var(--curriculum-accent);
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.programming-topic-detail .reference-list {
    margin: 0;
    padding-left: 24px;
    color: var(--curriculum-text);
    font-size: 0.95rem;
    line-height: 1.8;
}

.programming-topic-detail .reference-list li {
    margin-bottom: 10px;
    text-align: justify;
}

.programming-topic-detail .reference-list.electronic-links li {
    margin-bottom: 8px;
}

.programming-topic-detail .reference-list.electronic-links a {
    color: #60a5fa;
    text-decoration: none;
    font-family: Consolas, monospace;
    font-size: 0.925rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color 150ms ease;
}

.programming-topic-detail .reference-list.electronic-links a:hover {
    color: #93c5fd;
    text-decoration: underline;
}

.light-mode .programming-topic-detail .reference-list.electronic-links a {
    color: #1d4ed8;
}

.light-mode .programming-topic-detail .reference-list.electronic-links a:hover {
    color: #1e40af;
}

.programming-topic-detail .curriculum-empty p {
    margin: 0;
    color: var(--curriculum-muted);
    font-size: 0.875rem;
}

.programming-topic-detail .curriculum-empty p + p {
    margin-top: 8px;
}

.programming-topic-detail .curriculum-empty strong {
    color: var(--curriculum-text);
    font-weight: 600;
}

.programming-topic-detail .curriculum-problem + .curriculum-problem {
    margin-top: 16px;
}

.programming-topic-detail .curriculum-problem h3 {
    margin: 0 0 12px;
    color: var(--curriculum-accent);
    font-size: 1.0625rem;
    line-height: 1.5;
}

.programming-topic-detail .curriculum-problem {
    scroll-margin-top: 100px;
}

.programming-topic-detail .curriculum-problem-link {
    display: block;
    border-radius: inherit;
    color: var(--curriculum-text);
    text-decoration: none;
    transition: background-color 150ms ease;
}

.programming-topic-detail .curriculum-problem-link:hover,
.programming-topic-detail .curriculum-problem-link:focus-visible {
    background: var(--curriculum-hover);
}

.programming-topic-detail .curriculum-problem-link:focus-visible {
    border-radius: 14px;
}

.programming-topic-detail .curriculum-problem-action {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    color: var(--curriculum-accent);
    font-size: 0.875rem;
    font-weight: 600;
}

.programming-topic-detail .curriculum-problem .problem-source-note,
.editor-workspace .problem-source-note {
    margin-top: 16px;
    padding: 12px 16px;
    border: 1px solid rgba(185, 148, 71, .5);
    border-left: 3px solid #b99447;
    border-radius: 8px;
    background: rgba(185, 148, 71, .08);
    font-size: .8125rem;
    line-height: 1.8;
    overflow-wrap: anywhere;
}

.programming-topic-detail .curriculum-problem p,
.programming-topic-detail .problem-statement-text {
    margin: 0 0 12px;
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--curriculum-text);
}

.problem-formula {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 18px 0;
    font-size: 1rem;
}

.problem-formula-variable,
.problem-formula-expression {
    font-family: "Cambria Math", "Times New Roman", serif;
    font-size: 1.25em;
}

.problem-formula-variable {
    flex-shrink: 0;
    font-style: italic;
}

.problem-formula-brace {
    font-family: "Times New Roman", serif;
    font-size: 4em;
    font-weight: 400;
    line-height: 1;
}

.problem-formula-cases {
    display: grid;
    gap: 8px;
    min-width: 0;
}

.problem-formula-case {
    display: grid;
    grid-template-columns: minmax(115px, 1fr) 1fr;
    align-items: baseline;
    gap: 16px;
}

.problem-figures {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
    gap: 16px;
    margin: 18px 0 4px;
    max-width: 640px;
}

.problem-figure {
    margin: 0;
    min-width: 0;
}

.problem-figure img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 8px;
    background: #f8fafc;
}

@media (max-width: 480px) {
    .problem-formula { gap: 4px; font-size: .875rem; }
    .problem-formula-case { grid-template-columns: minmax(96px, 1fr) 1fr; gap: 8px; }
}

.programming-topic-detail .problem-subitems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
    gap: 10px;
    margin: 12px 0 6px;
}

.programming-topic-detail .problem-subitem {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--curriculum-heading);
    border: 1px solid var(--curriculum-border);
    border-radius: 8px;
    font-family: Consolas, "Courier New", monospace;
    font-size: 0.9rem;
    color: var(--curriculum-text);
}

.programming-topic-detail .problem-subitem.problem-subitem-plain {
    font-family: inherit;
    font-size: 0.9rem;
    grid-column: 1 / -1;
}

.programming-topic-detail .subitem-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 26px;
    height: 24px;
    padding: 0 6px;
    background: var(--curriculum-surface);
    border: 1px solid var(--curriculum-accent);
    border-radius: 5px;
    color: var(--curriculum-accent);
    font-weight: 700;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.programming-topic-detail .subitem-content {
    color: var(--curriculum-text);
    word-break: break-word;
    font-weight: 500;
}

.light-mode .programming-topic-detail .problem-subitem {
    background: #f7f2e7;
    border-color: #d8cbbc;
}

.light-mode .programming-topic-detail .subitem-num {
    background: #ffffff;
    border-color: var(--curriculum-accent);
    color: var(--curriculum-accent);
}

.programming-topic-detail .curriculum-navigation {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 14px;
    margin-top: 28px;
}

.programming-topic-detail .curriculum-navigation a {
    flex: 1 1 240px;
    min-width: 0;
    padding: 16px 18px;
    border: 1px solid var(--curriculum-border);
    border-radius: 10px;
    color: var(--curriculum-accent);
    font-size: 0.8125rem;
    text-decoration: none;
    overflow-wrap: anywhere;
}

.programming-topic-detail .curriculum-navigation a small {
    display: block;
    margin-bottom: 4px;
    color: var(--curriculum-muted);
    font-size: 0.6875rem;
}

@media (max-width: 760px) {
    .programming-catalog .curriculum-sections-nav,
    .programming-catalog .curriculum-chapters {
        grid-template-columns: minmax(0, 1fr);
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .programming-catalog .curriculum-chapter > header,
    .programming-catalog .curriculum-introduction {
        padding: 16px;
    }

    .programming-catalog .curriculum-topic {
        grid-template-columns: 36px minmax(0, 1fr);
        column-gap: 8px;
        padding: 14px 16px;
    }

    .programming-topic-detail .curriculum-empty,
    .programming-topic-detail .curriculum-problem-link {
        padding: 20px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .programming-catalog .curriculum-topic,
    .programming-topic-detail .curriculum-problem-link {
        transition: none;
    }
}

.programming-topic-detail .curriculum-examples-link {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-top: 24px;
    padding: 18px 20px;
    border: 1px solid var(--curriculum-accent);
    border-radius: 12px;
    background: var(--curriculum-heading);
    color: var(--curriculum-accent);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
}

.programming-topic-detail .curriculum-examples-link:hover,
.programming-topic-detail .curriculum-examples-link:focus-visible {
    background: var(--curriculum-hover);
}

.programming-topic-detail .curriculum-examples-link span {
    margin-left: auto;
    padding: 2px 10px;
    border-radius: 20px;
    background: var(--curriculum-hover);
    color: var(--curriculum-text);
    font-size: 0.75rem;
    font-weight: 500;
}

.sample-problems {
    --sample-solution-surface: var(--curriculum-hover);
    --sample-solution-border: var(--curriculum-border);
    --sample-answer-surface: #12382d;
}

.light-mode .sample-problems {
    --sample-solution-surface: #e9eee2;
    --sample-solution-border: #bdcbb6;
    --sample-answer-surface: #d8e6cc;
}

.sample-problems .sample-return,
.sample-problems .curriculum-breadcrumb a {
    max-width: 100%;
    overflow-wrap: anywhere;
}

.sample-problems .curriculum-summary,
.sample-problems .sample-intro {
    color: var(--curriculum-muted);
    font-size: 0.9375rem;
    line-height: 1.85;
    overflow-wrap: anywhere;
}

.sample-problems .curriculum-summary {
    margin: 0;
}

@media (max-width: 760px) {
    .programming-topic-detail .curriculum-breadcrumb { margin-bottom: 14px; font-size: 0.8125rem; }
    .programming-topic-detail .back-button { margin-bottom: 20px; font-size: 0.875rem; }
    .programming-topic-detail .curriculum-detail-heading { margin-bottom: 24px; }
    .programming-topic-detail .curriculum-detail-heading h1 { font-size: 34px; }
}

@media (max-width: 420px) {
    .programming-topic-detail .curriculum-detail-heading h1 { font-size: 30px; }
}

.sample-problems .sample-intro {
    margin: 24px 0 18px;
}

.sample-problems .sample-index {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 28px;
}

.sample-problems .sample-index a {
    padding: 16px;
    border: 1px solid var(--curriculum-border);
    border-radius: 10px;
    background: var(--curriculum-surface);
    color: var(--curriculum-accent);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    overflow-wrap: anywhere;
}

.sample-problems .sample-index a:hover,
.sample-problems .sample-index a:focus-visible {
    background: var(--curriculum-hover);
}

.sample-problems .sample-card {
    min-width: 0;
    margin-top: 24px;
    border: 1px solid var(--curriculum-border);
    border-radius: 14px;
    background: var(--curriculum-surface);
    scroll-margin-top: 100px;
    overflow-wrap: anywhere;
}

.sample-problems .sample-question {
    padding: 28px;
    border-bottom: 1px solid var(--curriculum-border);
    border-radius: 14px 14px 0 0;
    background: var(--curriculum-heading);
}

.sample-problems .sample-card h2 {
    margin: 0 0 14px;
    font-size: 1.375rem;
    line-height: 1.45;
    font-weight: 600;
}

.sample-problems .sample-card h3 {
    margin: 0 0 14px;
    font-size: 1.0625rem;
    font-weight: 600;
}

.sample-problems .sample-question h3 {
    margin: 22px 0 8px;
    color: var(--curriculum-muted);
    font-size: 0.8125rem;
}

.sample-problems .sample-solution {
    min-width: 0;
    margin: 24px;
    padding: 22px;
    border: 1px solid var(--sample-solution-border);
    border-radius: 12px;
    background: var(--sample-solution-surface);
}

.sample-problems .sample-solution > h3 {
    margin-bottom: 20px;
    color: var(--curriculum-accent);
    font-size: 1.125rem;
    line-height: 1.5;
}

.sample-problems .sample-statement,
.sample-problems .sample-steps p {
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.85;
}

.sample-problems .sample-steps {
    margin: 0;
    padding-left: 24px;
}

.sample-problems .sample-steps li {
    min-width: 0;
    padding: 16px;
    border: 1px solid var(--curriculum-border);
    border-radius: 10px;
    background: var(--curriculum-surface);
}

.sample-problems .sample-steps li + li {
    margin-top: 14px;
}

.sample-problems .sample-steps li::marker {
    color: var(--curriculum-accent);
    font-weight: 600;
}

.sample-problems .sample-formula {
    max-width: 100%;
    margin: 12px 0 0;
    padding: 16px;
    border: 1px solid var(--curriculum-border);
    border-radius: 8px;
    background: var(--curriculum-heading);
    color: var(--curriculum-text);
    font-family: Consolas, "Courier New", monospace;
    font-size: 14px;
    line-height: 1.8;
    overflow-x: auto;
    white-space: pre;
    overflow-wrap: normal;
    word-break: normal;
    tab-size: 4;
}

.sample-problems .sample-formula:focus-visible {
    outline: 3px solid #3b82f6;
    outline-offset: 3px;
}

.sample-problems .sample-formula code {
    padding: 0;
    background: transparent;
    color: inherit;
    font: inherit;
}

.sample-problems .sample-answer {
    display: grid;
    gap: 8px;
    margin: 0 24px 24px;
    padding: 18px 20px;
    border: 1px solid var(--curriculum-accent);
    border-left-width: 4px;
    border-radius: 10px;
    background: var(--sample-answer-surface);
}

.sample-problems .sample-answer h3 {
    margin: 0;
    color: var(--curriculum-accent);
    font-size: 0.9375rem;
}

.sample-problems .sample-answer code {
    min-width: 0;
    color: var(--curriculum-text);
    font-family: Consolas, "Courier New", monospace;
    font-size: 15px;
    line-height: 1.8;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.sample-problems .sample-note {
    margin: 0 28px 28px;
    color: var(--curriculum-muted);
    font-size: 0.8125rem;
    line-height: 1.8;
}

.sample-problems .sample-programs {
    display: grid;
    gap: 20px;
    margin: 0 24px 24px;
}

.sample-problems .sample-program {
    min-width: 0;
    padding: 22px;
    border: 1px solid var(--sample-solution-border);
    border-radius: 12px;
    background: var(--sample-solution-surface);
}

.sample-problems .sample-program h3 {
    color: var(--curriculum-accent);
}

.sample-problems .sample-program h4 {
    margin: 22px 0 0;
    font-size: 0.875rem;
    font-weight: 600;
}

.sample-problems .sample-program p {
    color: var(--curriculum-muted);
    font-size: 0.875rem;
    line-height: 1.8;
}

.sample-problems .sample-console {
    border-left: 3px solid var(--curriculum-accent);
}

.sample-problems .sample-source {
    --code-keyword: #c792ea;
    --code-string: #c3e88d;
    --code-number: #f78c6c;
    --code-function: #82aaff;
    --code-operator: #89ddff;
    --code-comment: #9bb7a2;
    --code-property: #f2c97d;
    --code-meta: #f39199;
}

.light-mode .sample-problems .sample-source {
    --code-keyword: #7534cb;
    --code-string: #32641c;
    --code-number: #a83b0d;
    --code-function: #245db2;
    --code-operator: #03648f;
    --code-comment: #4b6650;
    --code-property: #785100;
    --code-meta: #aa233b;
}

.sample-source .cm-keyword { color: var(--code-keyword); font-weight: 600; }
.sample-source .cm-string, .sample-source .cm-string-2 { color: var(--code-string); }
.sample-source .cm-number { color: var(--code-number); }
.sample-source .cm-def, .sample-source .cm-builtin { color: var(--code-function); }
.sample-source .cm-operator, .sample-source .cm-type, .sample-source .cm-variable-3 { color: var(--code-operator); }
.sample-source .cm-comment { color: var(--code-comment); font-style: italic; }
.sample-source .cm-variable-2, .sample-source .cm-property { color: var(--code-property); }
.sample-source .cm-meta, .sample-source .cm-atom { color: var(--code-meta); }

@media (max-width: 700px) {
    .sample-problems .sample-index {
        grid-template-columns: minmax(0, 1fr);
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .sample-problems .sample-programs { margin: 0 12px 16px; gap: 14px; }
    .sample-problems .sample-program { padding: 14px 12px; }
    .programming-topic-detail .curriculum-examples-link {
        padding: 16px;
    }

    .sample-problems .sample-question {
        padding: 18px;
    }

    .sample-problems .sample-card h2 {
        font-size: 1.25rem;
    }

    .sample-problems .sample-steps {
        padding-left: 20px;
    }

    .sample-problems .sample-solution {
        margin: 14px 12px;
        padding: 14px 12px;
    }

    .sample-problems .sample-steps li {
        padding: 12px;
    }

    .sample-problems .sample-answer {
        margin: 0 12px 16px;
    }

    .sample-problems .sample-note {
        margin: 0 18px 18px;
    }

    .sample-problems .sample-formula,
    .sample-problems .sample-answer {
        padding: 12px;
    }
}