:root {
    --yk-red:       #BA1824;
    --yk-red-dark:  #960f19;
    --yk-red-light: #fdf3f3;
    --yk-navy:      #0f172a;
    --yk-text:      #1e293b;
    --yk-muted:     #475569;
    --yk-muted-lt:  #94a3b8;
    --yk-bg:        #f8fafc;
    --yk-border:    #e2e8f0;
    --yk-white:     #ffffff;
    --yk-shadow:    0 1px 3px rgba(0,0,0,0.07), 0 4px 16px rgba(0,0,0,0.05);
    --yk-radius:    8px;
    --yk-radius-sm: 4px;
    --font:         -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Layout */
.ka-page-wrapper {
    max-width: 1280px;
    margin: 40px auto;
    padding: 0 24px;
    font-family: var(--font);
    color: var(--yk-text);
}
.ka-single-grid {
    display: grid !important;
    grid-template-columns: 280px minmax(0, 1fr) !important;
    gap: 56px !important;
    align-items: start !important;
}

/* Sidebar TOC */
.ka-sidebar-toc {
    position: sticky !important;
    top: 90px !important;
    border: 1px solid var(--yk-border);
    border-radius: var(--yk-radius);
    background: var(--yk-white);
    box-shadow: var(--yk-shadow);
    overflow: hidden;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--yk-border) transparent;
}
.ka-toc-header {
    padding: 14px 18px;
    background: var(--yk-bg);
    border-bottom: 1px solid var(--yk-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    position: sticky;
    top: 0;
    z-index: 1;
}
.ka-toc-header h4 {
    margin: 0 !important;
    font-size: 11px !important;
    font-weight: 700 !important;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--yk-muted) !important;
}
.ka-toc-header svg { width: 15px; height: 15px; fill: var(--yk-muted); transition: transform .3s; }
.ka-toc-header.is-collapsed svg { transform: rotate(180deg); }

.ka-reading-bar { height: 3px; background: var(--yk-border); margin: 0; }
.ka-reading-bar-fill { height: 100%; background: var(--yk-red); width: 0%; transition: width .1s linear; }

.ka-toc-body { padding: 14px 16px 16px; }
.ka-toc-body ul { list-style: none !important; padding: 0 !important; margin: 0 !important; }
.ka-toc-body li { margin-bottom: 1px !important; }
.ka-toc-body a {
    display: block;
    padding: 5px 10px;
    border-radius: var(--yk-radius-sm);
    font-size: 13px;
    line-height: 1.45;
    color: var(--yk-muted) !important;
    text-decoration: none !important;
    transition: background .2s, color .2s;
}
.ka-toc-body a:hover,
.ka-toc-body a.is-active { color: var(--yk-red) !important; background: var(--yk-red-light); }
.ka-toc-body a.is-active { font-weight: 600; }

.ka-sidebar-cta {
    margin: 4px 14px 14px;
    padding: 14px;
    background: var(--yk-red-light);
    border: 1px solid rgba(186,24,36,0.18);
    border-radius: var(--yk-radius-sm);
    text-align: center;
}
.ka-sidebar-cta p {
    margin: 0 0 10px !important;
    font-size: 12.5px !important;
    font-weight: 600 !important;
    color: var(--yk-red) !important;
    line-height: 1.4 !important;
}
.ka-sidebar-cta a {
    display: block;
    background: var(--yk-red);
    color: #fff !important;
    padding: 9px;
    border-radius: var(--yk-radius-sm);
    font-size: 13px;
    font-weight: 700;
    text-decoration: none !important;
    transition: background .2s;
}
.ka-sidebar-cta a:hover { background: var(--yk-red-dark); }

/* Article meta */
.ka-breadcrumbs-meta {
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--yk-border);
}
.ka-breadcrumbs {
    font-size: 13px;
    color: var(--yk-muted);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 2px;
    margin-bottom: 10px;
}
.ka-breadcrumbs a { color: var(--yk-red); text-decoration: none; }
.ka-breadcrumbs a:hover { text-decoration: underline; }
.ka-breadcrumbs .sep { color: var(--yk-border); margin: 0 3px; }
.ka-breadcrumbs .current { color: var(--yk-text); font-weight: 500; }

.rank-math-breadcrumb {
    font-size: 13px;
    color: var(--yk-muted);
    margin-bottom: 10px;
}
.rank-math-breadcrumb a { color: var(--yk-red); text-decoration: none; }

.ka-post-meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    font-size: 13px;
    color: var(--yk-muted);
    align-items: center;
}
.ka-post-meta-row .mi { display: flex; align-items: center; gap: 4px; }
.ka-post-meta-row svg { width: 13px; height: 13px; fill: currentColor; flex-shrink: 0; }
.ka-post-meta-row .mi-date { color: var(--yk-red); font-weight: 600; }

/* Share bar */
.ka-post-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
    padding: 14px 18px;
    background: var(--yk-bg);
    border: 1px solid var(--yk-border);
    border-radius: var(--yk-radius);
    align-items: center;
}
.ka-share-label {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--yk-muted);
}
.ka-btn {
    padding: 8px 16px;
    font-weight: 600;
    border-radius: var(--yk-radius-sm);
    font-size: 13px;
    color: #fff !important;
    text-decoration: none !important;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    line-height: 1;
    border: none;
    cursor: pointer;
    transition: filter .2s, transform .2s;
    white-space: nowrap;
}
.ka-btn svg { width: 14px; height: 14px; fill: currentColor; flex-shrink: 0; }
.ka-btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
.ka-btn-fb  { background: #1877F2; }
.ka-btn-wa  { background: #25D366; }
.ka-btn-in  { background: var(--yk-navy); }
.ka-btn-in:hover { background: var(--yk-red); }
.ka-btn-copy { background: var(--yk-muted-lt); color: #fff !important; }

/* Trust badges */
.ka-trust-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}
.ka-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
    background: var(--yk-bg);
    border: 1px solid var(--yk-border);
    color: var(--yk-muted);
}
.ka-badge svg { width: 12px; height: 12px; flex-shrink: 0; }
.ka-badge-green {
    background: #f0fdf4;
    border-color: rgba(34,197,94,.35);
    color: #166534;
}
.ka-badge-green svg { fill: #16a34a; }
.ka-badge-neutral svg { fill: var(--yk-muted); }

/* H1 */
.ka-post-content { min-width: 0; }
.ka-post-content h1 {
    font-size: 2.05rem;
    line-height: 1.25;
    margin: 0 0 24px;
    color: var(--yk-navy);
    font-weight: 800;
    letter-spacing: -.02em;
}

/* Body copy */
.ka-post-content .entry-content {
    overflow-wrap: anywhere;
}
.ka-post-content .entry-content p {
    line-height: 1.85;
    color: var(--yk-muted);
    margin-bottom: 20px;
    font-size: 16.5px;
}
.ka-post-content .entry-content h2 {
    border-bottom: 2px solid var(--yk-border);
    padding-bottom: 10px;
    margin: 52px 0 18px;
    font-size: 1.6rem;
    color: var(--yk-navy);
    font-weight: 800;
    letter-spacing: -.01em;
    scroll-margin-top: 100px;
}
.ka-post-content .entry-content h3 {
    font-size: 1.25rem;
    color: var(--yk-navy);
    margin: 36px 0 12px;
    font-weight: 700;
    scroll-margin-top: 100px;
}
.ka-post-content .entry-content h4 {
    font-size: 1.05rem;
    color: var(--yk-navy);
    margin: 22px 0 10px;
    font-weight: 700;
    scroll-margin-top: 100px;
}
.ka-post-content .entry-content h5 {
    font-size: .95rem;
    color: var(--yk-navy);
    margin: 16px 0 8px;
    font-weight: 700;
    scroll-margin-top: 100px;
}
.ka-post-content .entry-content h6 {
    font-size: .9rem;
    color: var(--yk-navy);
    margin: 14px 0 8px;
    font-weight: 700;
    scroll-margin-top: 100px;
}
.ka-hl {
    color: var(--yk-border) !important;
    text-decoration: none !important;
    margin-left: 7px;
    font-size: .65em;
    opacity: 0;
    transition: opacity .2s;
}
.ka-post-content .entry-content h2:hover .ka-hl,
.ka-post-content .entry-content h3:hover .ka-hl { opacity: 1; }

.ka-post-content .entry-content ul,
.ka-post-content .entry-content ol {
    padding-left: 22px;
    margin-bottom: 20px;
    color: var(--yk-muted);
    line-height: 1.8;
    font-size: 16px;
}
.ka-post-content .entry-content li { margin-bottom: 8px; }
.ka-post-content .entry-content strong { color: var(--yk-text); font-weight: 700; }
.ka-post-content .entry-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--yk-radius);
    margin: 28px 0;
    box-shadow: var(--yk-shadow);
    display: block;
}
.ka-post-content .entry-content blockquote {
    border-left: 4px solid var(--yk-red);
    margin: 28px 0;
    padding: 14px 22px;
    background: var(--yk-red-light);
    border-radius: 0 var(--yk-radius) var(--yk-radius) 0;
    font-size: 17px;
    font-style: italic;
    color: var(--yk-text);
    line-height: 1.7;
}
.ka-post-content .entry-content table {
    display: block;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 15px;
    box-shadow: var(--yk-shadow);
    border-radius: var(--yk-radius);
}
.ka-post-content .entry-content table th {
    background: var(--yk-navy);
    color: #fff;
    padding: 11px 15px;
    text-align: left;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.ka-post-content .entry-content table td {
    padding: 10px 15px;
    border-bottom: 1px solid var(--yk-border);
    color: var(--yk-muted);
    vertical-align: top;
}
.ka-post-content .entry-content table tr:nth-child(even) td { background: var(--yk-bg); }

/* Key Takeaways */
.ka-takeaways {
    background: #fff8f8;
    border: 1px solid rgba(186,24,36,.18);
    border-radius: var(--yk-radius);
    padding: 18px 22px;
    margin: 38px 0 24px;
}
.ka-takeaways-title {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .07em;
    color: var(--yk-red);
    margin: 0 0 12px;
    display: flex;
    align-items: center;
    gap: 5px;
}
.ka-takeaways-title svg { width: 14px; height: 14px; fill: currentColor; }
.ka-takeaways ul { list-style: none !important; padding: 0 !important; margin: 0 !important; }
.ka-takeaways li {
    padding: 6px 0 6px 22px;
    position: relative;
    font-size: 15px;
    color: var(--yk-text);
    border-bottom: 1px solid rgba(186,24,36,.08);
    line-height: 1.6;
}
.ka-takeaways li:last-child { border-bottom: none; }
.ka-takeaways li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--yk-red);
    font-weight: 700;
}

/* Stat cards */
.ka-stat-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    margin: 24px 0;
}
.ka-stat-card {
    background: var(--yk-bg);
    border: 1px solid var(--yk-border);
    border-radius: var(--yk-radius);
    padding: 14px;
    text-align: center;
}
.ka-stat-card .sn {
    font-size: 26px;
    font-weight: 800;
    color: var(--yk-red);
    letter-spacing: -.02em;
    line-height: 1;
    display: block;
    margin-bottom: 4px;
}
.ka-stat-card .sl {
    font-size: 12px;
    color: var(--yk-muted);
    font-weight: 500;
    line-height: 1.35;
}

/* CTA */
.ka-cta-box {
    background: linear-gradient(135deg, var(--yk-navy) 0%, #1a3050 100%);
    border-radius: var(--yk-radius);
    padding: 30px;
    margin: 44px 0;
    text-align: center;
    color: #fff;
}
.ka-cta-box h3 {
    font-size: 1.35rem !important;
    font-weight: 800 !important;
    margin: 0 0 8px !important;
    color: #fff !important;
    line-height: 1.3;
}
.ka-cta-box p {
    font-size: 14.5px !important;
    color: rgba(255,255,255,.8) !important;
    margin: 0 0 18px !important;
    line-height: 1.6 !important;
}
.ka-cta-row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.ka-cta-primary,
.ka-cta-secondary {
    color: #fff !important;
    padding: 12px 26px;
    border-radius: var(--yk-radius-sm);
    font-weight: 700;
    font-size: 14.5px;
    text-decoration: none !important;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}
.ka-cta-primary { background: var(--yk-red); }
.ka-cta-primary:hover { background: var(--yk-red-dark); }
.ka-cta-secondary {
    border: 1px solid rgba(255,255,255,.35);
    background: rgba(255,255,255,.1);
}
.ka-cta-secondary:hover { background: rgba(255,255,255,.18); }

/* Author box */
.ka-author-box {
    display: flex;
    gap: 18px;
    padding: 22px;
    background: var(--yk-bg);
    border: 1px solid var(--yk-border);
    border-radius: var(--yk-radius);
    margin: 44px 0 28px;
    align-items: flex-start;
}
.ka-author-avatar {
    width: 68px;
    height: 68px;
    border-radius: 50%;
    flex-shrink: 0;
    object-fit: cover;
    border: 3px solid var(--yk-red);
    background: var(--yk-border);
}
.ka-author-name { font-size: 15px; font-weight: 700; color: var(--yk-navy); margin: 0 0 3px; }
.ka-author-role { font-size: 12.5px; color: var(--yk-red); font-weight: 600; margin: 0 0 8px; }
.ka-author-bio  { font-size: 14px; color: var(--yk-muted); line-height: 1.65; margin: 0; }

/* Tags */
.ka-post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin: 28px 0;
    padding-top: 20px;
    border-top: 1px solid var(--yk-border);
    align-items: center;
}
.ka-tags-label { font-size: 12px; font-weight: 700; color: var(--yk-muted); text-transform: uppercase; letter-spacing: .05em; }
.ka-tag {
    padding: 4px 11px;
    background: var(--yk-bg);
    border: 1px solid var(--yk-border);
    border-radius: 20px;
    font-size: 12.5px;
    color: var(--yk-muted);
    text-decoration: none;
    transition: border-color .2s, color .2s;
}
.ka-tag:hover { border-color: var(--yk-red); color: var(--yk-red); }

/* Responsive */
@media (max-width: 1199px) {
    .ka-single-grid { gap: 40px !important; grid-template-columns: 240px minmax(0, 1fr) !important; }
}
@media (max-width: 991px) {
    .ka-single-grid { grid-template-columns: 1fr !important; gap: 0 !important; }
    .ka-sidebar-toc { display: none !important; }
    .ka-post-content h1 { font-size: 1.75rem; }
}
@media (max-width: 767px) {
    .ka-page-wrapper { padding: 0 16px; margin: 24px auto; }
    .ka-post-content h1 { font-size: 1.45rem; line-height: 1.28; margin-bottom: 22px; }
    .ka-post-content .entry-content p { font-size: 15.5px; line-height: 1.78; }
    .ka-post-content .entry-content h2 { font-size: 1.28rem; margin-top: 38px; }
    .ka-post-content .entry-content h3 { font-size: 1.12rem; }
    .ka-breadcrumbs-meta { margin-bottom: 22px; padding-bottom: 18px; }
    .ka-post-meta-row { gap: 10px; font-size: 12.5px; }

    /* Mobile share bar: no empty grid cell */
    .ka-post-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
        padding: 12px;
        margin-bottom: 22px;
    }
    .ka-share-label {
        grid-column: 1 / -1;
        margin-bottom: 2px;
    }
    .ka-btn {
        width: 100%;
        justify-content: center;
        padding: 10px 12px;
        font-size: 12.5px;
        min-height: 38px;
    }
    .ka-btn-in,
    .ka-btn-copy {
        grid-column: 1 / -1;
    }

    .ka-trust-badges { gap: 7px; }
    .ka-badge { font-size: 11.5px; padding: 4px 10px; }
    .ka-stat-grid { grid-template-columns: 1fr 1fr; gap: 9px; }
    .ka-stat-card { padding: 13px 10px; }
    .ka-stat-card .sn { font-size: 24px; }
    .ka-takeaways { padding: 16px 18px; margin: 34px 0 22px; }
    .ka-takeaways li { font-size: 14.5px; }
    .ka-author-box { flex-direction: column; padding: 20px; }
    .ka-cta-box { padding: 22px 18px; }
    .ka-cta-row { flex-direction: column; }
    .ka-cta-primary, .ka-cta-secondary { width: 100%; }
}
@media (max-width: 420px) {
    .ka-page-wrapper { padding: 0 14px; }
    .ka-stat-grid { grid-template-columns: 1fr 1fr; }
    .ka-post-actions { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 360px) {
    .ka-stat-grid { grid-template-columns: 1fr; }
    .ka-post-actions { grid-template-columns: 1fr; }
    .ka-btn-fb,
    .ka-btn-wa,
    .ka-btn-in,
    .ka-btn-copy {
        grid-column: 1 / -1;
    }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: .01ms !important; scroll-behavior: auto !important; }
}