/* Long-form document layout: engineering articles, the FAQ and the legal pages.
   Depends on css/shared.css. */

.doc {
    border-bottom: 1px solid var(--line);
}

.doc-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 40px 64px;
    padding-top: clamp(40px, 5vw, 72px);
    padding-bottom: clamp(64px, 8vw, 104px);
}

/* ---------- Contents ---------- */

.toc {
    flex: 0 0 240px;
    align-self: flex-start;
    font-size: 14px;
}

.toc-title {
    margin-bottom: 12px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.toc ol,
.toc ul {
    margin: 0;
    padding: 0;
    list-style: none;
    border-top: 1px solid var(--line);
}

.toc li {
    border-bottom: 1px solid var(--line);
}

.toc a {
    display: flex;
    align-items: center;
    min-height: 40px;
    padding: 4px 0;
    line-height: 1.35;
    color: var(--text-muted);
}

.toc a:hover {
    color: var(--text-strong);
}

@media (min-width: 900px) {
    .toc {
        position: sticky;
        top: var(--header-offset);
        max-height: calc(100vh - 128px);
        overflow-y: auto;
    }
}

@media (max-width: 899px) {
    .toc {
        flex-basis: 100%;
    }
}

/* ---------- Prose ---------- */

.prose {
    flex: 1 1 520px;
    min-width: 0;
    max-width: 760px;
    font-size: 17px;
    line-height: 1.75;
    color: var(--text-body);
    overflow-wrap: break-word;
}

.prose > :first-child {
    margin-top: 0;
}

.prose p {
    margin: 0 0 20px;
}

.prose h2 {
    margin: 56px 0 18px;
    font-size: clamp(24px, 2.6vw, 30px);
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.015em;
    color: var(--text-strong);
}

.prose h3 {
    margin: 36px 0 12px;
    font-size: 20px;
    line-height: 1.3;
    font-weight: 600;
    color: var(--text-strong);
}

.prose a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.prose a:hover {
    color: var(--text-strong);
}

.prose strong {
    font-weight: 600;
    color: var(--text-strong);
}

.prose ul,
.prose ol {
    margin: 0 0 20px;
    padding-left: 22px;
}

.prose li {
    margin-bottom: 10px;
}

.prose li::marker {
    color: var(--text-faint);
}

.prose code {
    padding: 1px 6px;
    border: 1px solid var(--line-card);
    border-radius: var(--radius-sm);
    background: var(--field);
    font-family: var(--font-mono);
    font-size: 0.86em;
    color: var(--text);
    overflow-wrap: anywhere;
}

/* ---------- Code blocks ---------- */

.prose .code-block {
    margin: 28px 0;
    overflow: hidden;
    border: 1px solid var(--line-panel);
    border-radius: var(--radius-lg);
    background: var(--panel);
}

.prose .code-head {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 6px 16px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--line);
    font-family: var(--font-mono);
    font-size: 12px;
}

.prose .code-lang {
    color: var(--accent);
}

.prose .code-note {
    color: var(--text-faint);
}

.prose pre {
    margin: 0;
    padding: 18px 16px;
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.65;
    tab-size: 4;
}

.prose pre code {
    padding: 0;
    border: 0;
    background: none;
    font-size: inherit;
    color: var(--text-body);
    white-space: pre;
    overflow-wrap: normal;
}

/* Syntax colours for highlight.js. Kept quiet: one accent, the rest in greys. */
.hljs-comment,
.hljs-quote {
    color: var(--text-faint);
    font-style: italic;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-built_in,
.hljs-meta .hljs-keyword {
    color: var(--accent);
}

.hljs-string,
.hljs-regexp,
.hljs-attr,
.hljs-symbol,
.hljs-template-variable {
    color: #A9D7B6;
}

.hljs-number,
.hljs-variable,
.hljs-params {
    color: var(--text);
}

.hljs-title,
.hljs-title.function_,
.hljs-title.class_,
.hljs-type,
.hljs-name,
.hljs-section {
    color: var(--text-strong);
    font-weight: 500;
}

.hljs-meta,
.hljs-tag,
.hljs-attribute {
    color: var(--text-muted);
}

.hljs-emphasis {
    font-style: italic;
}

.hljs-strong {
    font-weight: 600;
}

/* ---------- Callouts, flows, takeaways ---------- */

.prose .eng-callout {
    margin: 28px 0;
    padding: 20px 22px;
    border: 1px solid var(--line-panel);
    border-radius: var(--radius-lg);
    background: var(--panel);
}

.prose .eng-callout p {
    margin: 0;
    font-size: 15.5px;
    color: var(--text-muted);
}

.prose .eng-callout-label {
    display: block;
    margin-bottom: 8px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.prose .eng-flow {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 12px;
    margin: 28px 0;
}

.prose .flow-node {
    display: flex;
    flex: 1 1 170px;
    flex-direction: column;
    gap: 6px;
    padding: 18px;
    border: 1px solid var(--line-panel);
    border-radius: var(--radius-lg);
    background: var(--panel);
    font-size: 14px;
    line-height: 1.55;
    color: var(--text-muted);
}

.prose .flow-node strong {
    font-size: 16px;
}

.prose .flow-tag {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.prose .flow-arrow {
    align-self: center;
    font-size: 20px;
    color: var(--text-faint);
}

.prose .eng-takeaways {
    overflow: hidden;
    padding: 0;
    list-style: none;
    border: 1px solid var(--line-card);
    border-radius: var(--radius-lg);
}

.prose .eng-takeaways li {
    margin: 0;
    padding: 16px 20px;
    border-bottom: 1px solid var(--line);
    background: var(--panel);
}

.prose .eng-takeaways li:last-child {
    border-bottom: 0;
}

/* ---------- Author card ---------- */

.author-section {
    border-bottom: 1px solid var(--line);
    background: var(--bg-alt);
}

.author-section-inner {
    padding-top: clamp(56px, 7vw, 88px);
    padding-bottom: clamp(56px, 7vw, 88px);
}

.author-card {
    max-width: 860px;
    padding: clamp(24px, 3vw, 40px);
    border: 1px solid var(--line-panel);
    border-radius: var(--radius-lg);
    background: var(--bg);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-body);
}

.author-card .toc-title {
    margin-bottom: 14px;
}

.author-card p {
    margin-bottom: 14px;
}

.author-card strong {
    font-weight: 600;
    color: var(--text-strong);
}

.author-card p a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.author-card p a:hover {
    color: var(--text-strong);
}

.author-card .btn-row {
    margin-top: 22px;
}