/* Enterprise AI field notes — editorial, restrained, and built for long reading. */
.knowledge-page {
    --knowledge-paper: #f7f9fc;
    --knowledge-surface: #ffffff;
    --knowledge-ink: #111827;
    --knowledge-muted: #64748b;
    --knowledge-faint: #94a3b8;
    --knowledge-line: #dbe1e8;
    --knowledge-accent: #3155a6;
    background: var(--knowledge-paper);
}

.knowledge-home,
.knowledge-reading {
    color: var(--knowledge-ink);
    background: var(--knowledge-paper);
}

.knowledge-page .site-header {
    background: rgba(247, 249, 252, 0.95);
}

.knowledge-page .site-nav .nav-link {
    padding: 8px 0;
    border: 0;
    border-radius: 0;
    background: transparent;
}

.knowledge-page .site-nav .nav-link:hover {
    border: 0;
    background: transparent;
}

.knowledge-container {
    max-width: 1120px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.knowledge-kicker {
    margin: 0 0 15px;
    color: var(--knowledge-muted);
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.075em;
    line-height: 1.6;
}

/* Header / identity */
.knowledge-hero {
    padding: 94px 0 64px;
    border-bottom: 1px solid var(--knowledge-line);
}

.knowledge-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.75fr);
    gap: 88px;
    align-items: end;
}

.knowledge-hero-copy h1 {
    max-width: 760px;
    margin: 0;
    color: var(--knowledge-ink);
    font-size: clamp(44px, 5.2vw, 62px);
    font-weight: 650;
    letter-spacing: -0.055em;
    line-height: 1.08;
    overflow-wrap: anywhere;
}

.knowledge-lead {
    max-width: 690px;
    margin: 25px 0 0;
    color: #475569;
    font-size: 18px;
    line-height: 1.85;
}

.knowledge-thesis {
    padding: 21px 0 2px 25px;
    border-left: 3px solid var(--knowledge-accent);
}

.knowledge-thesis-label {
    margin: 0 0 16px;
    color: var(--knowledge-muted);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.07em;
}

.knowledge-thesis-statement {
    margin: 0;
    color: var(--knowledge-ink);
    font-size: 25px;
    font-weight: 650;
    letter-spacing: -0.035em;
    line-height: 1.48;
}

.knowledge-method {
    display: grid;
    grid-template-columns: auto 38px auto 38px auto 38px auto;
    gap: 13px;
    align-items: center;
    width: max-content;
    margin-top: 38px;
    color: var(--knowledge-ink);
}

.knowledge-method span {
    display: flex;
    gap: 8px;
    align-items: baseline;
    font-size: 14px;
    font-weight: 620;
}

.knowledge-method small {
    color: var(--knowledge-faint);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 9px;
    font-weight: 400;
}

.knowledge-method i {
    color: var(--knowledge-faint);
    font-size: 13px;
    font-style: normal;
    text-align: center;
}

/* Search behaves like an index tool, not a SaaS call to action. */
.knowledge-search {
    display: grid;
    grid-template-columns: 20px minmax(0, 1fr) auto;
    gap: 13px;
    align-items: center;
    max-width: 720px;
    margin-top: 37px;
    padding: 0 0 0 2px;
    border-top: 1px solid var(--knowledge-line);
    border-bottom: 1px solid var(--knowledge-line);
    background: transparent;
}

.knowledge-search:focus-within {
    border-bottom-color: var(--knowledge-accent);
}

.knowledge-search svg {
    width: 18px;
    color: var(--knowledge-muted);
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-width: 1.65;
}

.knowledge-search input {
    width: 100%;
    min-width: 0;
    padding: 15px 0;
    border: 0;
    outline: 0;
    color: var(--knowledge-ink);
    background: transparent;
    font: inherit;
    font-size: 14px;
}

.knowledge-search input::placeholder {
    color: var(--knowledge-faint);
}

.knowledge-search button {
    align-self: stretch;
    padding: 0 4px 0 20px;
    border: 0;
    border-left: 1px solid var(--knowledge-line);
    color: var(--knowledge-ink);
    background: transparent;
    font: inherit;
    font-size: 13px;
    font-weight: 650;
    cursor: pointer;
}

.knowledge-search button:hover {
    color: var(--knowledge-accent);
}

.knowledge-search-hint {
    margin: 9px 0 0 2px;
    color: var(--knowledge-faint);
    font-size: 11px;
}

/* Homepage structure */
.knowledge-main {
    padding-top: 82px;
    padding-bottom: 110px;
}

.knowledge-section + .knowledge-section {
    margin-top: 94px;
}

.knowledge-section-heading {
    display: flex;
    gap: 36px;
    align-items: end;
    justify-content: space-between;
    margin-bottom: 28px;
}

.knowledge-section-heading h2 {
    margin: 0;
    color: var(--knowledge-ink);
    font-size: clamp(27px, 2.8vw, 34px);
    font-weight: 630;
    letter-spacing: -0.035em;
    line-height: 1.2;
}

.knowledge-section-heading > p {
    max-width: 430px;
    margin: 0 0 2px;
    color: var(--knowledge-muted);
    font-size: 13px;
    line-height: 1.75;
    text-align: right;
}

/* Research tracks */
.knowledge-categories {
    display: grid;
    grid-template-columns: minmax(290px, 0.72fr) minmax(0, 1.45fr);
    gap: 68px;
    padding-top: 24px;
    border-top: 1px solid var(--knowledge-ink);
}

.knowledge-category-core,
.knowledge-category-support {
    min-width: 0;
}

.knowledge-category-support {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 38px;
}

.knowledge-category-group-label {
    grid-column: 1 / -1;
    margin: 0 0 9px;
    color: var(--knowledge-faint);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.08em;
}

.knowledge-category {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 58px;
    gap: 18px;
    min-height: 154px;
    padding: 22px 0 23px;
    border-bottom: 1px solid var(--knowledge-line);
    color: inherit;
    text-decoration: none;
    align-items: start;
}

.knowledge-category:hover,
.knowledge-category:focus-visible {
    color: inherit;
    background: transparent;
}

.knowledge-category:focus-visible,
.knowledge-article-row a:focus-visible,
.knowledge-tags a:focus-visible,
.knowledge-clear:focus-visible {
    outline: 2px solid var(--knowledge-accent);
    outline-offset: 4px;
}

.knowledge-category-body {
    display: block;
}

.knowledge-category-body strong {
    display: block;
    color: var(--knowledge-ink);
    font-size: 19px;
    font-weight: 630;
    letter-spacing: -0.02em;
}

.knowledge-category:hover .knowledge-category-body strong {
    color: var(--knowledge-accent);
}

.knowledge-category-body > span {
    display: block;
    max-width: 350px;
    margin-top: 12px;
    color: var(--knowledge-muted);
    font-size: 13px;
    line-height: 1.75;
}

.knowledge-category-primary {
    min-height: 316px;
    grid-template-columns: minmax(0, 1fr) 58px;
    align-content: space-between;
    border-bottom-color: var(--knowledge-ink);
}

.knowledge-category-primary .knowledge-category-body strong {
    max-width: 250px;
    font-size: 29px;
    line-height: 1.25;
}

.knowledge-category-primary .knowledge-category-body > span {
    max-width: 300px;
    margin-top: 18px;
    font-size: 14px;
}

.knowledge-category-meta {
    display: flex;
    gap: 10px;
    align-items: center;
    justify-content: flex-end;
    padding-top: 2px;
    color: var(--knowledge-muted);
    font-size: 11px;
    white-space: nowrap;
}

.knowledge-category-meta svg,
.knowledge-article-open svg {
    width: 18px;
    height: 18px;
    stroke-width: 1.35;
}

/* Filter results */
.knowledge-results {
    scroll-margin-top: 100px;
    padding: 31px 0 0;
    border-top: 2px solid var(--knowledge-ink);
}

.knowledge-results[hidden],
.knowledge-article-row[hidden],
.knowledge-empty[hidden] {
    display: none;
}

.knowledge-results-heading {
    margin-bottom: 8px;
}

.knowledge-clear {
    padding: 7px 0;
    border: 0;
    color: var(--knowledge-muted);
    background: transparent;
    font: inherit;
    font-size: 12px;
    cursor: pointer;
}

.knowledge-clear:hover {
    color: var(--knowledge-ink);
}

.knowledge-results-status {
    margin: 0 0 20px;
    color: var(--knowledge-muted);
    font-size: 12px;
}

/* Field note list */
.knowledge-article-list {
    border-top: 1px solid var(--knowledge-line);
}

.knowledge-article-row {
    display: grid;
    grid-template-columns: 145px minmax(0, 1fr) 30px;
    gap: 32px;
    align-items: start;
    padding: 28px 0 30px;
    border-bottom: 1px solid var(--knowledge-line);
}

.knowledge-article-date {
    display: flex;
    gap: 7px;
    color: var(--knowledge-muted);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 10px;
    line-height: 1.55;
    flex-direction: column;
}

.knowledge-article-date span {
    color: var(--knowledge-accent);
    font-family: var(--font-family);
    font-size: 11px;
    font-weight: 600;
}

.knowledge-article-copy h3 {
    margin: -4px 0 9px;
    color: var(--knowledge-ink);
    font-size: 20px;
    font-weight: 620;
    letter-spacing: -0.02em;
    line-height: 1.45;
}

.knowledge-article-copy h3 a {
    color: inherit;
    text-decoration: none;
}

.knowledge-article-copy h3 a:hover {
    color: var(--knowledge-accent);
}

.knowledge-article-copy > p {
    max-width: 690px;
    margin: 0;
    color: var(--knowledge-muted);
    font-size: 13px;
    line-height: 1.75;
}

.knowledge-article-tags {
    display: flex;
    gap: 8px;
    margin-top: 13px;
    flex-wrap: wrap;
}

.knowledge-article-tags-quiet {
    display: none;
}

.knowledge-article-tags span,
.knowledge-reading-meta span {
    color: var(--knowledge-muted);
    font-size: 11px;
    line-height: 1.5;
}

.knowledge-article-tags span + span::before,
.knowledge-reading-meta span + span::before {
    content: "·";
    margin-right: 8px;
    color: var(--knowledge-faint);
}

.knowledge-article-open {
    display: flex;
    width: 30px;
    height: 30px;
    align-items: center;
    justify-content: center;
    color: var(--knowledge-faint);
}

.knowledge-article-open:hover {
    color: var(--knowledge-accent);
}

.knowledge-empty,
.knowledge-section-empty {
    padding: 52px 20px 24px;
    color: var(--knowledge-muted);
    text-align: center;
}

.knowledge-empty strong,
.knowledge-section-empty strong {
    display: block;
    color: var(--knowledge-ink);
    font-size: 16px;
}

.knowledge-empty p,
.knowledge-section-empty p,
.knowledge-section-empty-inline {
    margin: 8px 0 0;
    color: var(--knowledge-muted);
    font-size: 12px;
}

/* Topics are an index, not pills. */
.knowledge-tags {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 34px;
    border-top: 1px solid var(--knowledge-ink);
}

.knowledge-tags a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    border-bottom: 1px solid var(--knowledge-line);
    color: var(--knowledge-ink);
    text-decoration: none;
    font-size: 13px;
}

.knowledge-tags a:hover {
    color: var(--knowledge-accent);
}

.knowledge-tags small {
    color: var(--knowledge-faint);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 10px;
}

/* Reading view */
.knowledge-reading {
    padding: 48px 0 110px;
}

.knowledge-reading-container {
    max-width: 980px;
}

.knowledge-breadcrumb {
    display: flex;
    gap: 9px;
    align-items: center;
    margin-bottom: 68px;
    color: var(--knowledge-muted);
    font-size: 12px;
}

.knowledge-breadcrumb a {
    color: inherit;
    text-decoration: none;
}

.knowledge-breadcrumb a:hover {
    color: var(--knowledge-accent);
}

.knowledge-reading-document {
    max-width: 820px;
    margin: 0 auto;
    min-width: 0;
}

.knowledge-reading-byline {
    margin: 0 0 19px;
    color: var(--knowledge-accent);
    font-size: 12px;
    font-weight: 650;
    letter-spacing: 0.015em;
}

.knowledge-reading-header {
    padding-bottom: 40px;
    border-bottom: 1px solid var(--knowledge-ink);
}

.knowledge-reading-header h1 {
    max-width: 720px;
    margin: 0;
    color: var(--knowledge-ink);
    font-size: clamp(38px, 4.8vw, 54px);
    font-weight: 650;
    letter-spacing: -0.05em;
    line-height: 1.15;
    overflow-wrap: anywhere;
}

.knowledge-reading-summary {
    max-width: 680px;
    margin: 22px 0 0;
    color: #526176;
    font-size: 17px;
    line-height: 1.8;
}

.knowledge-reading-meta {
    display: flex;
    gap: 24px;
    align-items: center;
    justify-content: space-between;
    margin-top: 28px;
    color: var(--knowledge-muted);
    font-size: 11px;
}

.knowledge-reading-meta > div {
    display: flex;
    gap: 0;
    flex-wrap: wrap;
}

.knowledge-reading-body {
    max-width: 720px;
    padding: 48px 0 62px;
    color: #1f2937;
    font-size: 17px;
    line-height: 1.9;
}

.knowledge-reading-body > * + * {
    margin-top: 1.4em;
}

.knowledge-reading-body h2,
.knowledge-reading-body h3 {
    color: var(--knowledge-ink);
    letter-spacing: -0.025em;
    line-height: 1.4;
}

.knowledge-reading-body h2 {
    margin-top: 2.5em;
    font-size: 26px;
}

.knowledge-reading-body h3 {
    margin-top: 2.1em;
    font-size: 21px;
}

.knowledge-reading-body a {
    color: var(--knowledge-accent);
    text-underline-offset: 3px;
}

.knowledge-reading-body blockquote {
    margin-left: 0;
    padding: 3px 0 3px 21px;
    border-left: 2px solid var(--knowledge-accent);
    color: var(--knowledge-muted);
}

.knowledge-reading-body ul,
.knowledge-reading-body ol {
    padding-left: 1.4em;
}

.knowledge-reading-body li + li {
    margin-top: 0.48em;
}

.knowledge-reading-body pre {
    max-width: 100%;
    padding: 19px 21px;
    overflow-x: auto;
    border: 1px solid var(--knowledge-line);
    border-radius: 2px;
    background: #f4f5f6;
    font-size: 13px;
    line-height: 1.7;
    -webkit-overflow-scrolling: touch;
}

.knowledge-reading-body code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.knowledge-reading-body :not(pre) > code {
    padding: 0.14em 0.34em;
    background: #f0f1f3;
    font-size: 0.88em;
}

.knowledge-reading-body table {
    display: block;
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    border-collapse: collapse;
    font-size: 14px;
    -webkit-overflow-scrolling: touch;
}

.knowledge-reading-body th,
.knowledge-reading-body td {
    min-width: 150px;
    padding: 11px 14px;
    border: 1px solid var(--knowledge-line);
    text-align: left;
    vertical-align: top;
}

.knowledge-reading-body th {
    color: var(--knowledge-ink);
    background: #f4f5f6;
    font-weight: 650;
}

.knowledge-reading-body hr {
    margin: 2.7em 0;
    border: 0;
    border-top: 1px solid var(--knowledge-line);
}

.knowledge-reading-body img {
    display: block;
    max-width: 100%;
    height: auto;
    border-radius: 0;
}

.knowledge-reading-footer {
    padding-top: 27px;
    border-top: 1px solid var(--knowledge-line);
}

.knowledge-reading-footer a {
    color: var(--knowledge-muted);
    font-size: 12px;
    text-decoration: none;
}

.knowledge-reading-footer a:hover {
    color: var(--knowledge-accent);
}

/* Dark mode keeps the paper character without glass effects. */
[data-theme="dark"] .knowledge-page {
    --knowledge-paper: #10141b;
    --knowledge-surface: #151a22;
    --knowledge-ink: #eef1f5;
    --knowledge-muted: #a0aaba;
    --knowledge-faint: #778295;
    --knowledge-line: #2d3542;
    --knowledge-accent: #9da7ff;
}

[data-theme="dark"] .knowledge-page .site-header {
    background: rgba(16, 20, 27, 0.95);
}

[data-theme="dark"] .knowledge-lead,
[data-theme="dark"] .knowledge-reading-summary,
[data-theme="dark"] .knowledge-reading-body {
    color: #b8c1ce;
}

[data-theme="dark"] .knowledge-reading-body pre,
[data-theme="dark"] .knowledge-reading-body th,
[data-theme="dark"] .knowledge-reading-body :not(pre) > code {
    background: #171d26;
}

@media (max-width: 940px) {
    .knowledge-hero-grid {
        gap: 48px;
    }

    .knowledge-categories {
        grid-template-columns: 1fr;
        gap: 42px;
    }

    .knowledge-category-primary {
        min-height: 210px;
    }

    .knowledge-tags {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 720px) {
    .knowledge-page .lang-toggle {
        display: none;
    }

    .knowledge-page .header-actions {
        gap: 6px;
    }

    .knowledge-hero {
        padding: 58px 0 44px;
    }

    .knowledge-hero-grid {
        grid-template-columns: 1fr;
        gap: 38px;
    }

    .knowledge-hero-copy h1 {
        max-width: 430px;
        font-size: clamp(39px, 11.5vw, 50px);
    }

    .knowledge-lead {
        margin-top: 19px;
        font-size: 16px;
        line-height: 1.8;
    }

    .knowledge-thesis {
        max-width: 420px;
        padding-top: 17px;
    }

    .knowledge-method {
        grid-template-columns: auto 22px auto 22px auto 22px auto;
        gap: 7px;
        width: 100%;
    }

    .knowledge-search {
        grid-template-columns: 18px minmax(0, 1fr) auto;
        margin-top: 36px;
    }

    .knowledge-search input {
        padding: 14px 0;
        font-size: 13px;
    }

    .knowledge-search button {
        padding-left: 14px;
        font-size: 12px;
    }

    .knowledge-main {
        padding-top: 58px;
        padding-bottom: 78px;
    }

    .knowledge-section + .knowledge-section {
        margin-top: 70px;
    }

    .knowledge-section-heading {
        display: block;
        margin-bottom: 23px;
    }

    .knowledge-section-heading > p {
        margin-top: 10px;
        text-align: left;
    }

    .knowledge-categories {
        grid-template-columns: 1fr;
        gap: 42px;
    }

    .knowledge-category-support {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .knowledge-category {
        grid-template-columns: minmax(0, 1fr) 45px;
        gap: 13px;
        min-height: 0;
        padding: 23px 0;
    }

    .knowledge-category-primary {
        min-height: 230px;
    }

    .knowledge-category-body strong {
        font-size: 18px;
    }

    .knowledge-category-body > span {
        margin-top: 8px;
    }

    .knowledge-category-meta > span {
        display: none;
    }

    .knowledge-results {
        padding-top: 24px;
    }

    .knowledge-results-heading {
        display: flex;
        align-items: end;
    }

    .knowledge-article-row {
        grid-template-columns: minmax(0, 1fr) 28px;
        gap: 13px;
        padding: 24px 0 25px;
    }

    .knowledge-article-date {
        grid-column: 1 / -1;
        gap: 9px;
        flex-direction: row;
    }

    .knowledge-article-copy h3 {
        font-size: 18px;
    }

    .knowledge-tags {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        column-gap: 24px;
    }

    .knowledge-reading {
        padding: 32px 0 76px;
    }

    .knowledge-breadcrumb {
        margin-bottom: 38px;
    }

    .knowledge-reading-header {
        padding-bottom: 33px;
    }

    .knowledge-reading-header h1 {
        font-size: clamp(36px, 10.5vw, 46px);
    }

    .knowledge-reading-summary {
        margin-top: 18px;
        font-size: 16px;
    }

    .knowledge-reading-meta {
        align-items: flex-start;
        flex-direction: column;
    }

    .knowledge-reading-body {
        padding-top: 36px;
        font-size: 16px;
    }
}

@media (max-width: 430px) {
    .knowledge-method span {
        gap: 4px;
        font-size: 12px;
    }

    .knowledge-method small {
        font-size: 8px;
    }

    .knowledge-category-support {
        grid-template-columns: 1fr;
    }

    .knowledge-category {
        grid-template-columns: minmax(0, 1fr) 22px;
    }

    .knowledge-category-meta > span {
        display: none;
    }

    .knowledge-tags {
        grid-template-columns: 1fr 1fr;
        column-gap: 18px;
    }

}

@media (prefers-reduced-motion: reduce) {
    .knowledge-home *,
    .knowledge-reading * {
        scroll-behavior: auto !important;
    }
}