* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg: #ffffff;
    --bg-soft: #f8fafc;
    --border: #e5e7eb;
    --border-hover: #cbd5e1;
    --text: #0f172a;
    --text-muted: #64748b;
    --text-dim: #94a3b8;
    --accent: #000000;
    --accent-hover: #1f1f1f;
    --radius: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px rgba(15,23,42,.05);
    --shadow-md: 0 2px 4px rgba(15,23,42,.06), 0 6px 16px rgba(15,23,42,.05);
    --k-feature: #7c3aed;
    --k-feature-bg: #f5f3ff;
    --k-improvement: #0369a1;
    --k-improvement-bg: #f0f9ff;
    --k-fix: #b45309;
    --k-fix-bg: #fffbeb;
    --k-security: #b91c1c;
    --k-security-bg: #fef2f2;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.blog-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: transparent;
    padding: 12px 16px;
    pointer-events: none;
}
.blog-nav-inner {
    pointer-events: auto;
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 28px;
    display: flex;
    align-items: center;
    gap: 32px;
    background: rgba(255,255,255,.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 999px;
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
}
.blog-logo {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text);
}
.blog-nav-links {
    display: flex;
    gap: 24px;
    flex: 1;
}
.blog-nav-links a {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    transition: color .15s;
}
.blog-nav-links a:hover,
.blog-nav-links a.is-active { color: var(--text); }
.blog-nav-actions { display: flex; align-items: center; gap: 16px; }
.blog-link-muted {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
}
.blog-link-muted:hover { color: var(--text); }
.blog-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 600;
    background: var(--accent);
    color: #fff;
    transition: background .15s, transform .1s;
}
.blog-btn:hover { background: var(--accent-hover); }
.blog-btn:active { transform: translateY(1px); }
@media (max-width: 820px) {
    .blog-nav-links, .blog-nav-actions { display: none; }
}

.rel-wrap {
    max-width: 1160px;
    margin: 0 auto;
    padding: 120px 32px 80px;
}
@media (max-width: 600px) { .rel-wrap { padding: 100px 20px 56px; } }

.rel-head { margin-bottom: 32px; }
.rel-kicker {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .09em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 10px;
}
.rel-h1 {
    font-size: clamp(30px, 5vw, 44px);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 12px;
}
.rel-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 36px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}
.rel-filter {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 14px;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--bg);
    transition: border-color .15s, color .15s, background .15s;
}
.rel-filter:hover { border-color: var(--border-hover); color: var(--text); }
.rel-filter.is-active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.rel-filter-n {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-dim);
}
.rel-filter.is-active .rel-filter-n { color: rgba(255,255,255,.7); }

.rel-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .02em;
    background: var(--bg-soft);
    color: var(--text-muted);
}
.rel-k-feature.rel-badge { background: var(--k-feature-bg); color: var(--k-feature); }
.rel-k-improvement.rel-badge { background: var(--k-improvement-bg); color: var(--k-improvement); }
.rel-k-fix.rel-badge { background: var(--k-fix-bg); color: var(--k-fix); }
.rel-k-security.rel-badge { background: var(--k-security-bg); color: var(--k-security); }

.rel-version {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--text);
}

.rel-date {
    font-size: 12px;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.rl-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px 28px;
}
@media (max-width: 960px) { .rl-grid { grid-template-columns: repeat(2, 1fr); gap: 32px 20px; } }
@media (max-width: 620px) { .rl-grid { grid-template-columns: 1fr; } }

.rl-card {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.rl-art {
    display: block;
    position: relative;
    aspect-ratio: 1 / 1;
    border-radius: 24px;
    overflow: hidden;
    background: #05070f;
    transition: transform .2s ease, box-shadow .2s ease;
}
.rl-art-img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.rl-card:hover .rl-art {
    transform: translateY(-4px);
    box-shadow: 0 18px 40px rgba(15, 23, 42, .18);
}
.rl-k-feature.rl-art { background: linear-gradient(150deg, #2b1152, #8E2DE4 60%, #FE2E9A); }
.rl-k-improvement.rl-art { background: linear-gradient(150deg, #06182f, #2D6BE4 60%, #8E2DE4); }
.rl-k-fix.rl-art { background: linear-gradient(150deg, #24130a, #b45309 60%, #FF2E3A); }
.rl-k-security.rl-art { background: linear-gradient(150deg, #250b0b, #FF2E3A 60%, #FE2E9A); }

.rl-line {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}
.rl-ver {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 999px;
    background: var(--accent);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    letter-spacing: -.01em;
}
.rl-title {
    font-size: 18px;
    font-weight: 650;
    letter-spacing: -0.02em;
    line-height: 1.25;
}
.rl-card:hover .rl-title { text-decoration: underline; text-underline-offset: 3px; }
.rl-date { font-size: 12px; color: var(--text-muted); margin-top: -6px; }
.rel-highlights {
    list-style: none;
    margin-top: 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.rel-highlights li {
    position: relative;
    padding-left: 22px;
    font-size: 14px;
    color: var(--text);
}
.rel-highlights li::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-dim);
}
.rel-highlights.is-compact { margin-top: 12px; gap: 5px; }
.rel-highlights.is-compact li { font-size: 13px; color: var(--text-muted); }

.rel-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    margin-top: 48px;
    flex-wrap: wrap;
}
.rel-pagination a,
.rel-pagination span {
    padding: 9px 14px;
    border-radius: var(--radius);
    font-size: 13px;
    color: var(--text-muted);
    transition: background .15s, color .15s;
}
.rel-pagination a:hover { background: var(--bg-soft); color: var(--text); }
.rel-pagination .current {
    background: var(--accent);
    color: #fff;
    font-weight: 600;
}

.rel-empty {
    text-align: center;
    padding: 80px 20px;
    background: var(--bg-soft);
    border: 1px dashed var(--border);
    border-radius: var(--radius-lg);
    max-width: 560px;
    margin: 0 auto;
}
.rel-empty svg {
    width: 40px; height: 40px;
    color: var(--text-dim);
    margin-bottom: 14px;
}
.rel-empty h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 6px;
}
.rel-empty p { font-size: 13px; color: var(--text-muted); }

.rel-hero-wrap { max-width: 560px; }
.rel-hero-img {
    aspect-ratio: 1 / 1;
    height: auto;
    border: none;
    border-radius: 24px;
}

.rel-head-tags {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.rel-summary {
    padding: 20px 22px;
    margin-bottom: 30px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.rel-summary-title {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--text-dim);
}
.rel-summary .rel-highlights { margin-top: 12px; }

.rel-nav-siblings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 44px;
    padding-top: 28px;
    border-top: 1px solid var(--border);
}
.rel-sibling {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color .15s, background .15s;
}
.rel-sibling:hover { border-color: var(--border-hover); background: var(--bg-soft); }
.rel-sibling.is-next { text-align: right; grid-column: 2; }
.rel-sibling-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--text-dim);
}
.rel-sibling-title {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.35;
}
@media (max-width: 600px) {
    .rel-nav-siblings { grid-template-columns: 1fr; }
    .rel-sibling.is-next { grid-column: 1; text-align: left; }
}

.rel-others {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
@media (max-width: 820px) { .rel-others { grid-template-columns: 1fr; } }
.rel-other {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 18px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: transform .15s, border-color .15s, box-shadow .15s;
}
.rel-other:hover {
    transform: translateY(-2px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}
.rel-other-title {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.35;
}
.rel-other-date { font-size: 12px; color: var(--text-muted); }

.preview-banner {
    position: sticky;
    top: 0;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px 14px;
    padding: 10px 18px;
    background: #b45309;
    color: #fff;
    font-size: 14px;
    line-height: 1.4;
    text-align: center;
}
.preview-banner strong {
    text-transform: uppercase;
    letter-spacing: .06em;
    font-size: 12px;
}
.preview-banner-date { opacity: .85; }