:root {
    --bj-color-off-black: #fe4c02;
    --bj-color-text: #111111;
    --bj-color-muted: #7b7b78;
    --bj-color-secondary: #626260;
    --bj-color-bg: #faf9f6;
    --bj-color-card: #ffffff;
    --bj-color-border: #dedbd6;
    --bj-color-soft: #faf9f6;
    --bj-color-soft-strong: #d3cec6;
    --bj-color-accent: #ff5600;
    --bj-color-accent-deep: #fe4c02;
    --bj-color-label: #7b7b78;
    --bj-color-body-soft: #626260;
    --bj-radius-button: 4px;
    --bj-radius-card: 8px;
    --bj-radius-panel: 8px;
    --bj-shadow-card: none;
    --bj-container: 1180px;
    --bj-section-border: 1px solid rgba(222, 219, 214, 0.72);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--bj-color-text);
    background: var(--bj-color-bg);
    font-family: Saans, "Saans Fallback", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-feature-settings: "kern";
    line-height: 1.5;
    letter-spacing: 0;
}

body.nav-open {
    overflow: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    text-underline-offset: 4px;
}

a:hover {
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

p {
    color: var(--bj-color-secondary);
}

a:focus-visible,
button:focus-visible,
.btn:focus-visible,
.archive-filter-card:focus-visible,
.topic-link-card:focus-visible,
.content-card-title a:focus-visible,
.pagination-wrap .page-numbers:focus-visible {
    outline: 2px dashed var(--bj-color-accent);
    outline-offset: 4px;
}

.container {
    width: min(var(--bj-container), calc(100% - 48px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(250, 249, 246, 0.96);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--bj-color-border);
}

.site-header-inner {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.site-branding {
    flex: 0 0 auto;
}

.site-branding-link {
    display: inline-flex;
    align-items: center;
    color: var(--bj-color-text);
    line-height: 1;
}

.site-branding-link:not(:has(.site-logo))::after {
    content: "AI";
    margin-left: 8px;
    padding: 3px 5px;
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-button);
    color: var(--bj-color-accent);
    font-family: SaansMono, ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.8px;
}

.site-branding-link:hover {
    text-decoration: none;
}

.site-logo {
    display: block;
    width: auto;
    height: 32px;
}

.site-nav {
    flex: 1;
    min-width: 0;
}

.primary-menu {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px 22px;
    padding: 0;
    margin: 0;
    list-style: none;
    color: var(--bj-color-text);
    font-size: 15px;
    font-weight: 400;
}

.primary-menu li {
    flex: 0 0 auto;
}

.primary-menu a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 0 2px;
    white-space: nowrap;
    border-radius: 6px;
}

.primary-menu a:hover,
.header-link:hover {
    color: var(--bj-color-accent);
}

.site-header-actions,
.hero-actions,
.archive-hero-actions,
.card-actions,
.single-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.site-header-actions {
    flex: 0 0 auto;
    white-space: nowrap;
}

.header-link {
    color: var(--bj-color-secondary);
    font-size: 14px;
    font-weight: 400;
}

.header-link-muted {
    color: var(--bj-color-muted);
}

.mobile-nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    min-height: 40px;
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-button);
    color: var(--bj-color-text);
    background: transparent;
    font: inherit;
    cursor: pointer;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 18px;
    border-radius: var(--bj-radius-button);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.2;
    border: 1px solid var(--bj-color-off-black);
    transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
    cursor: pointer;
}

.btn:hover {
    transform: scale(1.1);
    text-decoration: none;
}

.btn:active {
    transform: scale(0.85);
}

.btn-small {
    min-height: 36px;
    padding: 0 14px;
    font-size: 14px;
}

.btn-primary {
    color: #ffffff;
    background: var(--bj-color-off-black);
}

.btn-primary:hover {
    color: var(--bj-color-off-black);
    background: #ffffff;
    border-color: var(--bj-color-off-black);
}

.btn-secondary {
    color: var(--bj-color-off-black);
    background: transparent;
    border-color: var(--bj-color-off-black);
}

.btn-secondary:hover {
    color: #ffffff;
    background: var(--bj-color-off-black);
}

.hero,
.archive-hero,
.single-hero {
    padding: 68px 0 68px;
    background: var(--bj-color-bg);
    border-bottom: 1px solid var(--bj-color-border);
}

.hero-inner,
.archive-hero-layout,
.single-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr);
    gap: 56px;
    align-items: center;
}

.hero-eyebrow,
.card-kicker,
.topic-kicker,
.archive-hero-panel span,
.hero-card-label,
.eyebrow {
    color: var(--bj-color-label);
    font-family: SaansMono, ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 11px;
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.hero.home-hero {
    background: linear-gradient(135deg, rgba(255, 86, 0, 0.08), rgba(255, 255, 255, 0) 62%),
        var(--bj-color-bg);
}

.archive-hero-panel .hero-eyebrow,
.home-hero .hero-eyebrow,
.hero-card-summary .hero-card-label,
.hero-card-item .hero-card-label,
.site-branding-link::after {
    color: var(--bj-color-accent);
}

.hero-eyebrow {
    margin: 0 0 16px;
    color: var(--bj-color-accent);
}

.hero h1,
.archive-hero h1,
.single-hero h1 {
    max-width: 880px;
    margin: 0;
    color: var(--bj-color-text);
    font-size: clamp(44px, 5.8vw, 62px);
    font-weight: 400;
    line-height: 1.04;
    letter-spacing: -2.2px;
}

.hero-description,
.archive-hero p:not(.hero-eyebrow),
.single-summary {
    max-width: 680px;
    margin: 24px 0 0;
    color: var(--bj-color-secondary);
    font-size: 18px;
    line-height: 1.35;
    letter-spacing: -0.2px;
}

.hero-actions {
    margin-top: 32px;
}

.archive-hero-panel{
    background: linear-gradient(135deg, rgba(255, 86, 0, 0.08), rgba(255, 255, 255, 0) 62%),
        var(--bj-color-bg);
}

.hero-card,
.single-hero-media,
.single-avatar,
.single-hero-fallback {
    background: #ffffff;
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-card);
    box-shadow: none;
}

.hero-card {
    padding: 16px;
    display: grid;
    gap: 12px;
}

.hero-card-summary {
    padding: 20px;
    background: #ffffff;
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-card);
}

.hero-card-summary strong {
    display: block;
    margin-top: 12px;
    color: var(--bj-color-text);
    font-size: 30px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.9px;
}

.hero-card-summary p {
    margin: 12px 0 0;
    color: var(--bj-color-body-soft);
    font-size: 15px;
    line-height: 1.45;
}

.hero-card-steps {
    display: grid;
    gap: 12px;
}

.marketing-summary-card .hero-card-item:first-child {
    background: #ffffff;
}

.marketing-summary-card .hero-card-item:first-child .hero-card-label {
    color: var(--bj-color-accent);
}

.hero-card-item,
.product-card-item {
    min-height: 96px;
    padding: 16px;
    background: var(--bj-color-bg);
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-card);
}

.hero-card-item strong,
.product-card-item strong {
    display: block;
    margin-top: 10px;
    color: var(--bj-color-text);
    font-size: 18px;
    font-weight: 400;
    line-height: 1.08;
    letter-spacing: -0.42px;
}

.hero-card-item p,
.product-card-item p {
    margin: 8px 0 0;
    color: var(--bj-color-body-soft);
    font-size: 14px;
    line-height: 1.42;
}

.metric-strip {
    background: var(--bj-color-off-black);
    color: #ffffff;
    border-bottom: 1px solid var(--bj-color-border);
}

.metric-strip-inner {
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    font-size: 11px;
    font-family: SaansMono, ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    letter-spacing: 0.8px;
    text-transform: uppercase;
}

.section {
    padding: 72px 0;
    background: var(--bj-color-bg);
    border-top: var(--bj-section-border);
}

.home-alt-section,
.archive-filter-section,
.related-section:nth-of-type(even) {
    background: #ffffff;
}

.section-heading {
    max-width: 820px;
    margin: 0 0 32px;
}

.section-heading-row {
    max-width: none;
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
}

.section-heading h2 {
    margin: 0;
    color: var(--bj-color-text);
    font-size: clamp(30px, 3.8vw, 44px);
    font-weight: 400;
    line-height: 1.06;
    letter-spacing: -1.35px;
}

.section-heading p:not(.hero-eyebrow) {
    max-width: 680px;
    margin: 14px 0 0;
    color: var(--bj-color-body-soft);
    font-size: 16px;
    line-height: 1.55;
}

.feature-grid,
.marketing-grid,
.content-card-grid,
.archive-filter-grid,
.related-content-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.marketing-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.course-grid,
.mentor-grid,
.career-grid,
.activity-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.feature-card,
.content-card,
.archive-filter-card,
.single-panel,
.empty-state-card,
.topic-link-card,
.comment-preview-item,
.value-card,
.path-card,
.download-card,
.partnership-card,
.step-card,
.home-cta-card,
.contact-card,
.qr-placeholder {
    background: var(--bj-color-card);
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-card);
    box-shadow: none;
}

.feature-card,
.archive-filter-card,
.empty-state-card,
.value-card,
.path-card,
.download-card,
.partnership-card,
.step-card,
.home-cta-card,
.contact-card,
.qr-placeholder {
    padding: 24px;
}

.feature-card h3,
.content-card-title,
.single-panel-title,
.archive-filter-card strong,
.value-card h3,
.path-card h3,
.download-card h3,
.partnership-card h3,
.step-card h3,
.home-cta-card h2,
.contact-card h2 {
    margin: 0;
    color: var(--bj-color-text);
    font-size: 18px;
    font-weight: 400;
    line-height: 1.08;
    letter-spacing: -0.48px;
}

.feature-card p:not(.hero-eyebrow),
.content-card-excerpt,
.archive-filter-card span,
.content-card-note,
.single-panel p,
.value-card p,
.path-card p,
.download-card p,
.partnership-card p,
.step-card p,
.home-cta-card p,
.contact-card p {
    margin: 12px 0 0;
    color: var(--bj-color-body-soft);
    font-size: 14px;
    line-height: 1.55;
}

.feature-card .btn,
.content-card .btn,
.single-panel .btn,
.home-cta-card .btn,
.contact-card .btn {
    margin-top: 18px;
}

.content-card {
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.content-card-thumb {
    display: block;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--bj-color-bg);
    border-bottom: 1px solid var(--bj-color-border);
}

.content-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.content-card-icon,
.single-hero-fallback,
.single-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bj-color-label);
    background:
        linear-gradient(135deg, rgba(255, 86, 0, 0.08), rgba(255, 255, 255, 0) 62%),
        var(--bj-color-bg);
    font-size: 0;
    line-height: 1;
    letter-spacing: 0;
}

.content-card-icon {
    min-height: 132px;
    border-bottom: 1px solid var(--bj-color-border);
}

.content-card-icon::before {
    content: "PUBLIC";
    color: var(--bj-color-label);
    font-family: SaansMono, ui-monospace, monospace;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 1px;
}

.single-hero-fallback::before,
.single-avatar::before {
    content: "AI";
    color: var(--bj-color-accent);
    font-family: SaansMono, ui-monospace, monospace;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 1px;
}

.content-card-body {
    padding: 18px;
    display: flex;
    flex: 1;
    flex-direction: column;
}

.content-card-title {
    font-size: 21px;
    line-height: 1.14;
    letter-spacing: -0.46px;
}

.content-card-title a:hover {
    color: var(--bj-color-text);
    text-decoration: underline;
}

.card-kicker-row,
.single-meta-line,
.metric-row,
.term-row,
.tag-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.card-kicker-row {
    margin-bottom: 14px;
}

.card-meta,
.single-meta-line,
.metric-row span,
.term-row a,
.tag-row span,
.price-label {
    color: var(--bj-color-muted);
    font-family: SaansMono, ui-monospace, monospace;
    font-size: 12px;
    line-height: 1.25;
    letter-spacing: 0.7px;
    text-transform: uppercase;
}

.term-row,
.tag-row,
.metric-row,
.price-label {
    margin-top: 14px;
}

.term-row a,
.tag-row span,
.metric-row span {
    padding: 6px 8px;
    background: var(--bj-color-bg);
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-button);
}

.term-row a:hover {
    color: var(--bj-color-accent);
    border-color: var(--bj-color-accent);
}

.card-actions {
    margin-top: auto;
    padding-top: 22px;
}

.step-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.step-card span {
    display: inline-flex;
    margin-bottom: 18px;
    color: var(--bj-color-label);
    font-family: SaansMono, ui-monospace, monospace;
    font-size: 11px;
    letter-spacing: 1px;
}

.home-cta-card,
.contact-card {
    padding: 40px;
}

.home-cta-card h2,
.contact-card h2 {
    max-width: 860px;
    font-size: clamp(38px, 5vw, 54px);
    letter-spacing: -1.6px;
}

.contact-field-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-top: 24px;
}

.contact-field-grid span,
.qr-placeholder {
    min-height: 52px;
    display: flex;
    align-items: center;
    padding: 14px;
    color: var(--bj-color-secondary);
    background: var(--bj-color-bg);
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-button);
}

.qr-placeholder {
    min-height: 220px;
    justify-content: center;
    color: var(--bj-color-label);
    font-family: SaansMono, ui-monospace, monospace;
    font-size: 11px;
    letter-spacing: 1px;
}

.archive-hero-panel {
    padding: 32px;
}

.archive-hero-panel strong {
    display: block;
    margin-top: 12px;
    color: var(--bj-color-text);
    font-size: 18px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.96px;
}

.archive-filter-section {
    padding: 24px 0;
    border-bottom: 1px solid var(--bj-color-border);
}

.archive-filter-card {
    display: block;
    transition: transform 0.18s ease, border-color 0.18s ease;
}

.archive-filter-card:hover {
    transform: translateY(-2px);
    border-color: var(--bj-color-accent);
}

.single-hero-media,
.single-avatar {
    min-height: 320px;
    overflow: hidden;
}

.single-hero-media img,
.single-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.single-section {
    padding-top: 72px;
}

.single-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 28px;
    align-items: start;
}

.single-main,
.content-article {
    background: #ffffff;
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-card);
    padding: 36px;
}

.entry-content {
    color: var(--bj-color-text);
    font-size: 18px;
    line-height: 1.7;
}

.entry-content h2,
.entry-content h3,
.entry-content h4 {
    color: var(--bj-color-text);
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.8px;
}

.entry-content h2 {
    margin-top: 44px;
    font-size: 36px;
}

.entry-content h3 {
    margin-top: 32px;
    font-size: 28px;
}

.entry-content p,
.entry-content li {
    color: var(--bj-color-secondary);
}

.single-sidebar {
    display: grid;
    gap: 16px;
    position: sticky;
    top: 96px;
}

.single-panel {
    padding: 24px;
}

.single-meta-grid {
    display: grid;
    gap: 10px;
    margin-top: 18px;
}

.single-meta-item {
    padding: 14px;
    background: var(--bj-color-bg);
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-button);
}

.single-meta-item span {
    display: block;
    color: var(--bj-color-muted);
    font-family: SaansMono, ui-monospace, monospace;
    font-size: 12px;
    letter-spacing: 0.7px;
    text-transform: uppercase;
}

.single-meta-item strong {
    display: block;
    margin-top: 6px;
    color: var(--bj-color-text);
    font-size: 18px;
    font-weight: 400;
}

.single-cta-panel {
    background: var(--bj-color-off-black);
    border-color: var(--bj-color-off-black);
}

.single-cta-panel h2,
.single-cta-panel p {
    color: #ffffff;
}

.single-cta-panel .btn-primary {
    color: var(--bj-color-off-black);
    background: #ffffff;
    border-color: #ffffff;
}

.single-cta-panel .btn-secondary {
    color: #ffffff;
    border-color: rgba(255,255,255,0.5);
}

.comment-preview-list {
    display: grid;
    gap: 10px;
    margin-top: 16px;
}

.comment-preview-item {
    padding: 14px;
}

.pagination-wrap {
    margin-top: 40px;
}

.pagination-wrap .nav-links {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.pagination-wrap .page-numbers {
    min-width: 38px;
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-button);
    background: #ffffff;
}

.pagination-wrap .current,
.pagination-wrap .page-numbers:hover {
    color: #ffffff;
    background: var(--bj-color-off-black);
    border-color: var(--bj-color-off-black);
}

.site-footer {
    padding: 72px 0 36px;
    background: #222222;
    color: #ffffff;
}

.site-footer p,
.site-footer a,
.site-footer span {
    color: rgba(255,255,255,0.7);
    font-size: 15px;
    line-height: 1.55;
}

.site-footer .site-branding-link {
    color: #ffffff;
    font-size: 24px;
}

.site-footer .footer-logo {
    width: 150px;
    filter: invert(1) hue-rotate(180deg) saturate(0) brightness(2.4);
}

.site-footer-grid {
    display: grid;
    grid-template-columns: 1.35fr repeat(4, 1fr);
    gap: 40px;
}

.footer-brand p {
    max-width: 360px;
    margin: 18px 0 0;
    font-size: 14px;
}

.footer-column h2 {
    margin: 0 0 18px;
    color: #ffffff;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.2px;
}

.footer-links {
    display: grid;
    gap: 10px;
}

.footer-links a,
.footer-links span {
    font-size: 14px;
    line-height: 1.45;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    margin-top: 56px;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.16);
}

.footer-bottom p {
    margin: 0;
    color: rgba(255,255,255,0.56);
    font-size: 13px;
}

.baijian-login-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(17,17,17,0.48);
}

.baijian-login-modal.is-open {
    display: flex;
}

.baijian-login-modal-card {
    width: min(440px, 100%);
    padding: 28px;
    background: #ffffff;
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-card);
}

.baijian-login-modal-card h2 {
    margin: 0;
    color: var(--bj-color-text);
    font-size: 32px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.96px;
}

.baijian-login-modal-card p {
    margin: 14px 0 0;
}

.baijian-login-modal-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    flex-wrap: wrap;
}

@media (max-width: 1024px) {
    .site-header-inner {
        min-height: 64px;
    }

    .mobile-nav-toggle {
        display: inline-flex;
    }

    .site-nav {
        position: fixed;
        inset: 64px 0 auto 0;
        display: none;
        padding: 20px 24px 28px;
        background: var(--bj-color-bg);
        border-bottom: 1px solid var(--bj-color-border);
    }

    .site-nav.is-open {
        display: block;
    }

    .primary-menu {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        justify-content: stretch;
        gap: 8px;
        font-size: 16px;
    }

    .primary-menu a {
        min-height: 44px;
        padding: 0 12px;
        background: #ffffff;
        border: 1px solid var(--bj-color-border);
    }

    .site-header-actions .header-link-muted {
        display: none;
    }

    .hero-inner,
    .archive-hero-layout,
    .single-hero-inner,
    .single-layout {
        grid-template-columns: 1fr;
    }

    .single-sidebar {
        position: static;
    }

    .marketing-grid,
    .feature-grid,
    .content-card-grid,
    .archive-filter-grid,
    .course-grid,
    .mentor-grid,
    .career-grid,
    .activity-grid,
    .step-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .site-footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        width: min(100% - 32px, var(--bj-container));
    }

    .site-header-actions .header-link {
        display: none;
    }

    .hero,
    .archive-hero,
    .single-hero {
        padding: 64px 0 52px;
    }

    .section {
        padding: 64px 0;
    }

    .section-heading-row {
        display: block;
    }

    .section-heading-row .btn {
        margin-top: 20px;
    }

    .hero h1,
    .archive-hero h1,
    .single-hero h1 {
        letter-spacing: -1.6px;
    }

    .hero-description,
    .archive-hero p:not(.hero-eyebrow),
    .single-summary {
        font-size: 18px;
    }

    .marketing-grid,
    .feature-grid,
    .content-card-grid,
    .archive-filter-grid,
    .course-grid,
    .mentor-grid,
    .career-grid,
    .activity-grid,
    .step-list,
    .contact-field-grid,
    .site-footer-grid {
        grid-template-columns: 1fr;
    }

    .metric-strip-inner {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        padding: 14px 0;
    }

    .single-main,
    .content-article {
        padding: 24px;
    }
}

@media (max-width: 530px) {
    .site-branding-link {
        font-size: 24px;
    }

    .site-footer .site-branding-link {
        font-size: 22px;
    }

    .btn {
        width: 100%;
    }

    .site-header-actions .btn {
        width: auto;
        min-height: 38px;
        padding: 0 12px;
    }

    .hero-actions,
    .card-actions,
    .single-actions,
    .archive-hero-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .primary-menu {
        grid-template-columns: 1fr;
    }

    .hero-card-summary strong {
        font-size: 26px;
        letter-spacing: -0.72px;
    }

    .hero-card-item strong,
    .archive-hero-panel strong {
        font-size: 18px;
    }
}

@media (max-width: 425px) {
    .container {
        width: min(100% - 24px, var(--bj-container));
    }

    .hero h1,
    .archive-hero h1,
    .single-hero h1 {
        font-size: 42px;
        letter-spacing: -1.2px;
    }

    .section-heading h2 {
        font-size: 32px;
        letter-spacing: -0.95px;
    }
}

/* Archive landing pages: activity, mentors, courses, careers */
body.post-type-archive-activity .archive-hero,
body.post-type-archive-mentor .archive-hero,
body.post-type-archive-course .archive-hero,
body.post-type-archive-career .archive-hero {
    padding: 88px 0 72px;
    background: var(--bj-color-bg);
}

body.post-type-archive-activity .archive-hero-layout,
body.post-type-archive-mentor .archive-hero-layout,
body.post-type-archive-course .archive-hero-layout,
body.post-type-archive-career .archive-hero-layout {
    grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.62fr);
    gap: 72px;
    align-items: center;
}

body.post-type-archive-activity .archive-hero h1,
body.post-type-archive-mentor .archive-hero h1,
body.post-type-archive-course .archive-hero h1,
body.post-type-archive-career .archive-hero h1 {
    max-width: 760px;
    font-size: clamp(56px, 5.2vw, 84px);
    line-height: 0.96;
    letter-spacing: -2.8px;
}

body.post-type-archive-activity .archive-hero p:not(.hero-eyebrow),
body.post-type-archive-mentor .archive-hero p:not(.hero-eyebrow),
body.post-type-archive-course .archive-hero p:not(.hero-eyebrow),
body.post-type-archive-career .archive-hero p:not(.hero-eyebrow) {
    max-width: 720px;
    margin-top: 24px;
    font-size: 19px;
    line-height: 1.45;
}

.archive-hero-actions {
    margin-top: 22px;
}

.archive-hero-panel {
    min-height: 200px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        padding: 28px;
}

.archive-hero-panel strong {
    max-width: 440px;
    font-size: clamp(24px, 1.8vw, 28px);
        line-height: 1.08;
        letter-spacing: -0.72px;
}

.archive-hero-panel p {
    margin-top: 16px;
        font-size: 15px;
        line-height: 1.5;
}

.archive-filter-section {
    padding: 28px 0;
    background: #ffffff;
}

.archive-filter-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.archive-filter-card {
    min-height: 86px;
    padding: 20px 22px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.archive-filter-card strong {
    flex: 0 0 auto;
    font-size: 22px;
    letter-spacing: -0.6px;
}

.archive-filter-card span {
    margin: 0;
    font-size: 14px;
}

.archive-section {
    padding: 72px 0 96px;
}

.content-card-grid.course-grid,
.content-card-grid.mentor-grid,
.content-card-grid.career-grid,
.content-card-grid.activity-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: stretch;
}

.content-card {
    min-height: 360px;
    background: #ffffff;
}

.content-card-body {
    padding: 24px;
}

.content-card-title {
    font-size: 28px;
    line-height: 1.04;
    letter-spacing: -0.84px;
}

.content-card-excerpt,
.content-card-note {
    font-size: 16px;
    line-height: 1.48;
}

.activity-card .content-card-title,
.course-card .content-card-title,
.mentor-card .content-card-title,
.career-card .content-card-title {
    min-height: 58px;
}

.content-card-thumb,
.content-card-icon {
    min-height: 170px;
}

.activity-card .metric-row,
.activity-card .term-row {
    min-height: 32px;
}

.card-actions {
    gap: 12px;
}

@media (max-width: 1024px) {
    body.post-type-archive-activity .archive-hero-layout,
    body.post-type-archive-mentor .archive-hero-layout,
    body.post-type-archive-course .archive-hero-layout,
    body.post-type-archive-career .archive-hero-layout,
    .content-card-grid.course-grid,
    .content-card-grid.mentor-grid,
    .content-card-grid.career-grid,
    .content-card-grid.activity-grid,
    .archive-filter-grid {
        grid-template-columns: 1fr;
    }

    .archive-hero-panel {
        min-height: auto;
    }
}



body.post-type-archive-activity .archive-hero-panel strong,
body.post-type-archive-mentor .archive-hero-panel strong,
body.post-type-archive-course .archive-hero-panel strong,
body.post-type-archive-career .archive-hero-panel strong {
    font-size: 18px;
    line-height: 1.25;
    letter-spacing: -0.2px;
}

body.post-type-archive-activity .archive-hero-panel p,
body.post-type-archive-mentor .archive-hero-panel p,
body.post-type-archive-course .archive-hero-panel p,
body.post-type-archive-career .archive-hero-panel p {
    margin-top: 12px;
    font-size: 14px;
    line-height: 1.5;
    letter-spacing: 0;
}

.archive-hero .archive-hero-panel > strong {
    font-size: 18px !important;
    line-height: 1.25 !important;
    letter-spacing: -0.2px !important;
}

.archive-hero .archive-hero-panel > p {
    margin-top: 12px !important;
    font-size: 14px !important;
    line-height: 1.5 !important;
    letter-spacing: 0 !important;
}

.archive-hero-panel > span {
    color: var(--bj-color-accent);
}


.home-hero-card-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    align-self: stretch;
}

.home-hero-feature-card {
    min-height: 180px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    background: #ffffff;
    border: 1px solid var(--bj-color-border);
    border-radius: var(--bj-radius-card);
}

.home-hero-feature-card h2 {
    margin: 0;
    color: var(--bj-color-text);
    font-size: 28px;
    font-weight: 400;
    line-height: 1.05;
    letter-spacing: -0.72px;
}

.home-hero-feature-card p {
    max-width: 240px;
    margin: 18px 0 0;
    color: var(--bj-color-secondary);
    font-size: 16px;
    line-height: 1.5;
}

.home-hero-progress {
    width: 100%;
    height: 10px;
    margin-top: auto;
    overflow: hidden;
    background: var(--bj-color-border);
    border-radius: 999px;
}

.home-hero-progress span {
    display: block;
    width: 94%;
    height: 100%;
    background: var(--bj-color-off-black);
    border-radius: inherit;
}

.home-hero-chip {
    width: fit-content;
    margin-top: 18px;
    padding: 8px 11px;
    color: #ffffff;
    background: var(--bj-color-accent);
    border-radius: var(--bj-radius-button);
    font-family: SaansMono, ui-monospace, monospace;
    font-size: 12px;
    line-height: 1;
    letter-spacing: 1.1px;
}

.home-hero-feature-card-dark {
    color: #ffffff;
    background: #333;
}

.home-hero-feature-card-dark h2 {
    color: #ffffff;
}

.home-hero-feature-card-dark p {
    color: rgba(255, 255, 255, 0.72);
}

.home-hero-report-bars {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: auto;
}

.home-hero-report-bars span {
    height: 48px;
    border-radius: var(--bj-radius-button);
    background: rgba(255, 255, 255, 0.16);
}

.home-hero-report-bars span:last-child {
    background: var(--bj-color-accent);
}

@media (max-width: 768px) {
    .home-hero-card-grid {
        grid-template-columns: 1fr;
    }
}

.home-hero-feature-card {
    min-height: 150px;
    padding: 24px;
}

.home-hero-feature-card h2 {
    font-size: 18px;
    line-height: 1.08;
    letter-spacing: -0.56px;
}

.home-hero-feature-card p {
    max-width: 220px;
    margin-top: 14px;
    font-size: 14px;
    line-height: 1.48;
}

.home-hero-chip {
    margin-top: 14px;
    padding: 7px 10px;
    font-size: 11px;
}

.home-hero-progress {
    height: 8px;
}

.home-hero-report-bars span {
    height: 40px;
}

.home-cta-card .hero-eyebrow {
    color: var(--bj-color-accent);
}

.home-cta-card > .hero-eyebrow {
    margin: 0 0 16px;
    color: var(--bj-color-accent);
    font-family: SaansMono, ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 11px;
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: 1px;
    text-transform: uppercase;
}