:root {
    --knowledge-navy: #172554;
    --knowledge-blue: #1e3a8a;
    --knowledge-cyan: #0891b2;
    --knowledge-amber: #d97706;
    --knowledge-text: #334155;
    --knowledge-muted: #64748b;
    --knowledge-line: #dbe5f0;
    --knowledge-surface: #f8fafc;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--knowledge-surface);
    color: var(--knowledge-text);
    font-family: Inter, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

.knowledge-shell {
    width: min(1180px, calc(100% - 2rem));
    margin-inline: auto;
}

.knowledge-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .5rem;
    padding-block: 1rem;
    color: var(--knowledge-muted);
    font-size: .875rem;
}

.knowledge-breadcrumb a {
    color: var(--knowledge-blue);
    font-weight: 600;
    text-decoration: none;
}

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

.knowledge-hero {
    position: relative;
    overflow: hidden;
    border-block: 1px solid #dbeafe;
    background:
        radial-gradient(circle at 88% 18%, rgba(14, 165, 233, .17), transparent 28%),
        radial-gradient(circle at 12% 88%, rgba(245, 158, 11, .11), transparent 24%),
        linear-gradient(135deg, #eff6ff 0%, #ffffff 52%, #ecfeff 100%);
}

.knowledge-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(17rem, 23rem);
    gap: 3rem;
    align-items: center;
    padding-block: clamp(3.5rem, 7vw, 6.5rem);
}

.knowledge-hero-single .knowledge-hero-inner {
    grid-template-columns: minmax(0, 1fr);
}

.knowledge-hero-single .knowledge-hero-lead {
    max-width: 54rem;
}

.knowledge-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    padding: .45rem .75rem;
    border: 1px solid #bfdbfe;
    border-radius: 999px;
    background: rgba(255, 255, 255, .78);
    color: var(--knowledge-blue);
    font-size: .78rem;
    font-weight: 800;
    letter-spacing: .08em;
}

.knowledge-hero h1 {
    max-width: 17ch;
    margin: 1.25rem 0 0;
    color: #0f172a;
    font-size: clamp(2.4rem, 5vw, 4.6rem);
    line-height: 1.08;
    letter-spacing: -.035em;
}

.knowledge-hero-lead {
    max-width: 46rem;
    margin: 1.35rem 0 0;
    color: #475569;
    font-size: clamp(1rem, 1.7vw, 1.2rem);
    line-height: 1.85;
}

.knowledge-summary-card {
    position: relative;
    padding: 1.6rem;
    border: 1px solid rgba(30, 58, 138, .14);
    border-radius: 1.25rem;
    background: rgba(255, 255, 255, .9);
    box-shadow: 0 24px 60px -42px rgba(15, 23, 42, .7);
}

.knowledge-summary-card::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 4px;
    border-radius: 1.25rem 0 0 1.25rem;
    background: linear-gradient(180deg, var(--knowledge-cyan), var(--knowledge-blue));
}

.knowledge-summary-card h2 {
    margin: 0;
    color: var(--knowledge-navy);
    font-size: 1rem;
}

.knowledge-summary-list {
    display: grid;
    gap: .75rem;
    margin: 1.1rem 0 0;
    padding: 0;
    list-style: none;
}

.knowledge-summary-list li {
    display: flex;
    align-items: center;
    gap: .65rem;
    color: #475569;
    font-size: .92rem;
}

.knowledge-summary-list i {
    display: grid;
    width: 2rem;
    height: 2rem;
    place-items: center;
    flex: 0 0 auto;
    border-radius: .65rem;
    background: #eff6ff;
    color: var(--knowledge-blue);
}

.knowledge-section {
    padding-block: clamp(3.5rem, 7vw, 6rem);
}

.knowledge-section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.knowledge-section-heading h2 {
    margin: .4rem 0 0;
    color: #0f172a;
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    line-height: 1.2;
}

.knowledge-section-heading p {
    max-width: 40rem;
    margin: 0;
    color: var(--knowledge-muted);
    line-height: 1.7;
}

.knowledge-category-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.knowledge-category-card {
    position: relative;
    min-height: 12rem;
    padding: 1.45rem;
    overflow: hidden;
    border: 1px solid var(--knowledge-line);
    border-radius: 1rem;
    background: #fff;
}

.knowledge-category-link {
    display: block;
    color: inherit;
    text-decoration: none;
    transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.knowledge-category-link:hover {
    transform: translateY(-3px);
    border-color: #93c5fd;
    box-shadow: 0 18px 40px -32px rgba(15, 23, 42, .65);
}

.knowledge-category-card.is-featured {
    border-color: #bae6fd;
    background: linear-gradient(145deg, #fff 0%, #f0f9ff 100%);
}

.knowledge-category-number {
    color: #cbd5e1;
    font-size: 2rem;
    font-weight: 900;
    line-height: 1;
}

.knowledge-category-card h3 {
    margin: 1rem 0 .5rem;
    color: var(--knowledge-navy);
    font-size: 1.15rem;
}

.knowledge-category-card p {
    margin: 0;
    color: var(--knowledge-muted);
    font-size: .9rem;
    line-height: 1.7;
}

.knowledge-category-state {
    display: inline-flex;
    margin-top: 1rem;
    color: var(--knowledge-cyan);
    font-size: .8rem;
    font-weight: 800;
}

.knowledge-article-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 16rem;
    gap: 2rem;
    align-items: center;
    padding: clamp(1.5rem, 4vw, 2.5rem);
    border: 1px solid #bfdbfe;
    border-radius: 1.25rem;
    background: #fff;
    box-shadow: 0 22px 60px -50px rgba(15, 23, 42, .8);
}

.knowledge-list {
    display: grid;
    gap: .85rem;
}

.knowledge-list-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.25rem;
    align-items: start;
    padding: 1.35rem 1.5rem;
    border: 1px solid var(--knowledge-line);
    border-radius: 1rem;
    background: #fff;
    transition: border-color .2s ease, box-shadow .2s ease;
}

.knowledge-list-card:hover {
    border-color: #bfdbfe;
    box-shadow: 0 18px 44px -38px rgba(15, 23, 42, .75);
}

.knowledge-list-number {
    display: inline-flex;
    min-height: 2.5rem;
    align-items: center;
    justify-content: center;
    padding: .45rem .7rem;
    border-radius: .75rem;
    background: #eff6ff;
    color: var(--knowledge-blue);
    font-size: .88rem;
    font-weight: 900;
    letter-spacing: .04em;
}

.knowledge-list-content h2,
.knowledge-list-content h3 {
    margin: 0;
    color: #0f172a;
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    line-height: 1.45;
}

.knowledge-list-content h2 a,
.knowledge-list-content h3 a {
    color: inherit;
    text-decoration: none;
}

.knowledge-list-content h2 a:hover,
.knowledge-list-content h3 a:hover {
    color: var(--knowledge-blue);
}

.knowledge-list-content p {
    margin: .55rem 0 0;
    color: var(--knowledge-muted);
    font-size: .92rem;
    line-height: 1.75;
}

.knowledge-list-link {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    margin-top: .75rem;
    color: var(--knowledge-cyan);
    font-size: .84rem;
    font-weight: 800;
    text-decoration: none;
}

.knowledge-article-card h3 {
    margin: .75rem 0 0;
    color: #0f172a;
    font-size: clamp(1.45rem, 2.5vw, 2rem);
    line-height: 1.35;
}

.knowledge-article-card p {
    margin: 1rem 0 0;
    color: var(--knowledge-muted);
    line-height: 1.8;
}

.knowledge-tag {
    display: inline-flex;
    padding: .35rem .65rem;
    border-radius: 999px;
    background: #ecfeff;
    color: #0e7490;
    font-size: .78rem;
    font-weight: 800;
}

.knowledge-read-link {
    display: inline-flex;
    min-height: 2.75rem;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    margin-top: 1.35rem;
    padding: .7rem 1.15rem;
    border-radius: 999px;
    background: var(--knowledge-blue);
    color: #fff;
    font-weight: 800;
    text-decoration: none;
}

.knowledge-read-link:hover {
    background: #1e40af;
}

.knowledge-card-visual {
    display: grid;
    min-height: 13rem;
    place-items: center;
    border-radius: 1rem;
    background:
        radial-gradient(circle at 70% 24%, rgba(255,255,255,.34), transparent 25%),
        linear-gradient(145deg, #0e7490, #1e3a8a);
    color: #fff;
    text-align: center;
}

.knowledge-card-visual strong {
    display: block;
    font-size: 3.5rem;
    line-height: 1;
}

.knowledge-card-visual span {
    display: block;
    margin-top: .6rem;
    font-size: .85rem;
    font-weight: 700;
    letter-spacing: .08em;
}

.knowledge-article-hero h1 {
    max-width: none;
    font-size: clamp(2.2rem, 4.2vw, 3.8rem);
    text-wrap: balance;
}

.knowledge-article-hero-simple .knowledge-hero-inner {
    grid-template-columns: minmax(0, 1fr);
}

.knowledge-article-hero-simple .knowledge-hero-lead {
    max-width: 54rem;
}

.knowledge-topic-groups {
    display: grid;
    gap: clamp(3rem, 6vw, 5rem);
}

.knowledge-topic-group {
    scroll-margin-top: 7rem;
}

.knowledge-topic-heading {
    display: grid;
    grid-template-columns: minmax(16rem, .8fr) minmax(0, 1.2fr);
    gap: 2rem;
    align-items: end;
    margin-bottom: 1.25rem;
    padding-bottom: 1.1rem;
    border-bottom: 1px solid var(--knowledge-line);
}

.knowledge-topic-heading h2 {
    margin: .35rem 0 0;
    color: #0f172a;
    font-size: clamp(1.45rem, 2.5vw, 2rem);
    line-height: 1.3;
}

.knowledge-topic-heading p {
    margin: 0;
    color: var(--knowledge-muted);
    line-height: 1.75;
}

.knowledge-topic-index {
    color: var(--knowledge-cyan);
    font-size: .76rem;
    font-weight: 900;
    letter-spacing: .08em;
}

.knowledge-article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem 1.25rem;
    margin-top: 1.4rem;
    color: var(--knowledge-muted);
    font-size: .9rem;
}

.knowledge-article-meta span {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
}

.knowledge-fact-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: .75rem;
    margin-top: 1.3rem;
}

.knowledge-fact-grid div {
    padding: 1rem;
    border: 1px solid #dbeafe;
    border-radius: .85rem;
    background: rgba(255,255,255,.88);
}

.knowledge-fact-grid strong,
.knowledge-fact-grid span {
    display: block;
}

.knowledge-fact-grid strong {
    color: var(--knowledge-blue);
    font-size: 1.15rem;
}

.knowledge-fact-grid span {
    margin-top: .2rem;
    color: var(--knowledge-muted);
    font-size: .78rem;
}

.knowledge-article-layout {
    display: grid;
    grid-template-columns: 15rem minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 5rem);
    align-items: start;
}

.knowledge-toc {
    position: sticky;
    top: 6.5rem;
    padding: 1.25rem;
    border: 1px solid var(--knowledge-line);
    border-radius: 1rem;
    background: #fff;
}

.knowledge-toc strong {
    color: var(--knowledge-navy);
    font-size: .9rem;
}

.knowledge-toc ol {
    display: grid;
    gap: .65rem;
    margin: 1rem 0 0;
    padding-left: 1.15rem;
    color: #94a3b8;
    font-size: .82rem;
}

.knowledge-toc a {
    color: #475569;
    line-height: 1.45;
    text-decoration: none;
}

.knowledge-toc a:hover {
    color: var(--knowledge-cyan);
}

.knowledge-prose {
    min-width: 0;
    max-width: 50rem;
    color: #334155;
    font-size: 1.02rem;
    line-height: 1.9;
}

.knowledge-prose .knowledge-lead {
    margin-top: 0;
    color: #334155;
    font-size: 1.16rem;
    line-height: 1.9;
}

.knowledge-prose h2 {
    scroll-margin-top: 7rem;
    margin: 3.5rem 0 1.15rem;
    padding-top: 1.25rem;
    border-top: 1px solid #e2e8f0;
    color: #0f172a;
    font-size: clamp(1.5rem, 2.4vw, 2rem);
    line-height: 1.35;
}

.knowledge-prose h2:first-of-type {
    margin-top: 2.25rem;
}

.knowledge-prose h3 {
    margin: 2rem 0 .75rem;
    color: var(--knowledge-navy);
    font-size: 1.18rem;
}

.knowledge-prose p {
    margin: 1rem 0;
}

.knowledge-prose ul,
.knowledge-prose ol {
    display: grid;
    gap: .55rem;
    margin: 1.1rem 0;
    padding-left: 1.4rem;
}

.knowledge-callout {
    margin: 1.5rem 0;
    padding: 1.25rem 1.35rem;
    border-left: 4px solid var(--knowledge-cyan);
    border-radius: 0 .9rem .9rem 0;
    background: #ecfeff;
    color: #164e63;
}

.knowledge-pathway {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: .65rem;
    margin: 1.5rem 0;
}

.knowledge-pathway div {
    padding: 1rem .75rem;
    border: 1px solid #bfdbfe;
    border-radius: .8rem;
    background: #eff6ff;
    color: var(--knowledge-blue);
    text-align: center;
    font-weight: 800;
}

.knowledge-inline-link {
    color: var(--knowledge-blue);
    font-weight: 800;
    text-underline-offset: 3px;
}

.knowledge-faq {
    display: grid;
    gap: .75rem;
    margin-top: 1.25rem;
}

.knowledge-faq details {
    padding: 1rem 1.1rem;
    border: 1px solid var(--knowledge-line);
    border-radius: .8rem;
    background: #fff;
}

.knowledge-faq summary {
    color: var(--knowledge-navy);
    font-weight: 800;
    cursor: pointer;
}

.knowledge-faq details p {
    margin-bottom: 0;
    color: var(--knowledge-muted);
}

.knowledge-article-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .8rem;
    margin-top: 3.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--knowledge-line);
}

.knowledge-article-nav a {
    display: flex;
    min-height: 4.5rem;
    align-items: center;
    gap: .65rem;
    padding: .9rem 1rem;
    border: 1px solid var(--knowledge-line);
    border-radius: .85rem;
    background: #fff;
    color: var(--knowledge-blue);
    font-size: .9rem;
    font-weight: 800;
    line-height: 1.5;
    text-decoration: none;
}

.knowledge-article-nav a:last-child {
    justify-content: flex-end;
    text-align: right;
}

.knowledge-article-nav a:hover {
    border-color: #93c5fd;
    background: #f8fbff;
}

.knowledge-cta {
    padding-block: clamp(3rem, 6vw, 5rem);
    background: linear-gradient(130deg, #172554, #1e3a8a 58%, #0e7490);
    color: #fff;
}

.knowledge-cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.knowledge-cta h2 {
    margin: 0;
    font-size: clamp(1.7rem, 3vw, 2.6rem);
}

.knowledge-cta p {
    max-width: 45rem;
    margin: .75rem 0 0;
    color: #dbeafe;
    line-height: 1.75;
}

.knowledge-cta a {
    display: inline-flex;
    min-height: 2.8rem;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    padding: .75rem 1.25rem;
    border-radius: 999px;
    background: #fff;
    color: var(--knowledge-blue);
    font-weight: 800;
    text-decoration: none;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
    outline: 3px solid #22d3ee;
    outline-offset: 3px;
}

@media (max-width: 900px) {
    .knowledge-hero-inner,
    .knowledge-article-layout {
        grid-template-columns: minmax(0, 1fr);
    }
    .knowledge-toc {
        position: static;
    }
    .knowledge-category-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 680px) {
    .knowledge-shell {
        width: min(100% - 1.25rem, 1180px);
    }
    .knowledge-section-heading,
    .knowledge-cta-inner {
        align-items: flex-start;
        flex-direction: column;
    }
    .knowledge-category-grid,
    .knowledge-article-card,
    .knowledge-fact-grid,
    .knowledge-pathway,
    .knowledge-list-card,
    .knowledge-article-nav {
        grid-template-columns: minmax(0, 1fr);
    }
    .knowledge-topic-heading {
        grid-template-columns: minmax(0, 1fr);
        gap: .6rem;
        align-items: start;
    }
    .knowledge-list-card {
        gap: .8rem;
        padding: 1.1rem;
    }
    .knowledge-list-number {
        justify-self: start;
    }
    .knowledge-article-nav a:last-child {
        justify-content: flex-start;
        text-align: left;
    }
    .knowledge-card-visual {
        min-height: 9rem;
    }
    .knowledge-prose {
        font-size: 1rem;
        line-height: 1.82;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .knowledge-category-link,
    .knowledge-list-card {
        transition: none;
    }
}