:root {
    --blog-ink: #14213d;
    --blog-muted: #526174;
    --blog-surface: #ffffff;
    --blog-page: #f6f8fc;
    --blog-brand: #146ef5;
    --blog-brand-dark: #0751be;
    --blog-accent: #06b6d4;
    --blog-line: #dfe7f1;
    --blog-success: #0d8a55;
    --blog-shadow: 0 16px 45px rgba(20, 33, 61, 0.09);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-width: 320px;
    overflow-x: clip;
    background: var(--blog-page);
    color: var(--blog-ink);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 17px;
    line-height: 1.7;
}

a { color: var(--blog-brand-dark); }
a:hover { color: var(--blog-brand); }

.blog-container { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }

.blog-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--blog-line);
    backdrop-filter: blur(12px);
}

.blog-header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.blog-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    color: var(--blog-ink);
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 0.03em;
    text-decoration: none;
}

.blog-brand img { width: 38px; height: 38px; border-radius: 10px; }
.blog-brand span { display: block; line-height: 1.05; }
.blog-brand small { display: block; color: var(--blog-brand); font-size: 0.62rem; letter-spacing: 0.22em; }

.blog-nav { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: 0.25rem 0.9rem; }
.blog-nav a { color: var(--blog-ink); font-size: 0.9rem; font-weight: 700; text-decoration: none; }
.blog-nav a:hover, .blog-nav a:focus-visible { color: var(--blog-brand); text-decoration: underline; text-underline-offset: 0.25rem; }

.article-hero {
    padding: 5.5rem 0 4rem;
    color: #fff;
    background:
        radial-gradient(circle at 85% 15%, rgba(6, 182, 212, 0.7), transparent 27rem),
        radial-gradient(circle at 10% 0%, rgba(20, 110, 245, 0.9), transparent 30rem),
        #10244a;
}

.article-hero .blog-container { max-width: 1120px; }

.article-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
    align-items: center;
    gap: clamp(1.5rem, 4vw, 4rem);
}

.article-hero-copy { min-width: 0; }

.article-hero-media {
    position: relative;
    aspect-ratio: 4 / 3;
    margin: 0;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 18px;
    background: #0c1d39;
    box-shadow: 0 22px 45px rgba(0, 0, 0, 0.22);
}

.article-hero-media::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(150deg, rgba(20, 110, 245, 0.14), rgba(6, 182, 212, 0.04) 55%, rgba(7, 20, 45, 0.36));
}

.article-hero-media img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-category {
    display: inline-flex;
    padding: 0.3rem 0.7rem;
    border: 1px solid rgba(255,255,255,0.38);
    border-radius: 999px;
    color: #e8f4ff;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.article-hero h1 {
    max-width: 880px;
    margin: 1rem 0;
    font-size: clamp(2rem, 6vw, 4rem);
    line-height: 1.1;
    letter-spacing: -0.045em;
}

.article-deck { max-width: 760px; margin: 0; color: #e3edff; font-size: clamp(1.05rem, 2.1vw, 1.25rem); }

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1rem;
    margin-top: 1.5rem;
    color: #e8f4ff;
    font-size: 0.9rem;
}
.article-meta span + span::before { content: "•"; margin-right: 1rem; opacity: 0.7; }

.article-layout {
    display: grid;
    grid-template-columns: minmax(0, 770px) 250px;
    align-items: start;
    gap: 3rem;
    max-width: 1080px;
    margin: 0 auto;
    padding: 3.5rem 1rem 4.5rem;
}

.article-body {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
    padding: clamp(1.25rem, 3vw, 2.5rem);
    background: var(--blog-surface);
    border: 1px solid var(--blog-line);
    border-radius: 20px;
    box-shadow: var(--blog-shadow);
}

.article-body > *:first-child { margin-top: 0; }
.article-body h2, .article-body h3 { color: var(--blog-ink); line-height: 1.25; letter-spacing: -0.025em; }
.article-body h2 { margin: 2.7rem 0 0.8rem; font-size: clamp(1.45rem, 3vw, 2rem); }
.article-body h3 { margin: 1.8rem 0 0.6rem; font-size: 1.2rem; }
.article-body p, .article-body li { color: #35445a; }
.article-body ul, .article-body ol { padding-left: 1.35rem; }
.article-body li + li { margin-top: 0.5rem; }
.article-body strong { color: var(--blog-ink); }
.article-body blockquote { margin: 1.5rem 0; padding: 1rem 1.2rem; border-left: 4px solid var(--blog-accent); background: #f0fbfd; color: #244359; }

.article-toc {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 92px;
    padding: 1.2rem;
    border: 1px solid var(--blog-line);
    border-radius: 14px;
    background: #fff;
}
.article-toc strong { display: block; margin-bottom: 0.55rem; font-size: 0.9rem; }
.article-toc ol { margin: 0; padding-left: 1.15rem; }
.article-toc li + li { margin-top: 0.45rem; }
.article-toc a { color: var(--blog-muted); font-size: 0.85rem; line-height: 1.35; text-decoration: none; }
.article-toc a:hover, .article-toc a:focus-visible { color: var(--blog-brand); text-decoration: underline; }

.article-callout {
    margin: 1.75rem 0;
    padding: 1.2rem 1.3rem;
    border: 1px solid #bfdbfe;
    border-radius: 14px;
    background: #eff6ff;
}

.article-diagram {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 2rem minmax(0, 1fr) 2rem minmax(0, 1fr);
    align-items: stretch;
    gap: 0.7rem;
    margin: 1.8rem 0 2.2rem;
    padding: 1rem;
    border: 1px solid var(--blog-line);
    border-radius: 16px;
    background:
        linear-gradient(135deg, rgba(20, 110, 245, 0.05), rgba(6, 182, 212, 0.08)),
        #fff;
}

.diagram-step {
    position: relative;
    min-width: 0;
    padding: 1rem;
    border: 1px solid rgba(20, 110, 245, 0.18);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.9);
}

.diagram-number {
    display: inline-grid;
    width: 1.75rem;
    height: 1.75rem;
    place-items: center;
    margin-bottom: 0.7rem;
    border-radius: 50%;
    color: #fff;
    background: linear-gradient(135deg, var(--blog-brand), var(--blog-accent));
    font-size: 0.8rem;
    font-weight: 800;
}

.diagram-step strong { display: block; color: var(--blog-ink); line-height: 1.25; }
.diagram-step span:last-child { display: block; margin-top: 0.3rem; color: var(--blog-muted); font-size: 0.82rem; line-height: 1.45; }

.diagram-arrow {
    align-self: center;
    justify-self: center;
    width: 2rem;
    height: 2rem;
    margin: 0;
    border: 1px solid #b9d8fd;
    border-radius: 50%;
    color: var(--blog-brand-dark);
    background: #fff;
    font-size: 1.25rem;
    font-weight: 800;
    line-height: 1.85rem;
    text-align: center;
    z-index: 1;
}

.article-diagram figcaption {
    grid-column: 1 / -1;
    padding: 0.2rem 0.2rem 0;
    color: var(--blog-muted);
    font-size: 0.8rem;
    line-height: 1.4;
}
.article-callout p { margin: 0; color: #1f3a63; }
.article-callout strong { color: #12386c; }

.article-checklist {
    margin: 1.5rem 0;
    padding: 1.2rem 1.35rem;
    border-radius: 14px;
    background: #f2fbf6;
}
.article-checklist h3 { margin-top: 0; }
.article-checklist ul { margin-bottom: 0; list-style: "✓  "; }
.article-checklist li::marker { color: var(--blog-success); font-weight: 800; }

.article-cta {
    margin-top: 2.5rem;
    padding: clamp(1.35rem, 4vw, 2rem);
    border-radius: 18px;
    color: #fff;
    background: linear-gradient(135deg, #0751be, #146ef5 60%, #0aaac7);
}
.article-cta h2 { margin-top: 0; color: #fff; }
.article-cta p { color: #eaf4ff; }
.button-link {
    display: inline-flex;
    align-items: center;
    min-height: 46px;
    margin-top: 0.4rem;
    padding: 0.65rem 1rem;
    border-radius: 9px;
    color: #0b3e88;
    background: #fff;
    font-weight: 800;
    text-decoration: none;
}
.button-link:hover, .button-link:focus-visible { color: #0b3e88; background: #eaf6ff; }

.article-disclosure, .article-sources {
    margin-top: 2.5rem;
    padding-top: 1.2rem;
    border-top: 1px solid var(--blog-line);
}
.article-disclosure p, .article-sources p { font-size: 0.92rem; }
.article-sources ul { font-size: 0.9rem; }

.blog-footer { padding: 2.5rem 0; color: #d8e5f8; background: #0b1b36; }
.blog-footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; }
.blog-footer a { color: #fff; }
.blog-footer p { margin: 0; font-size: 0.88rem; }

@media (max-width: 880px) {
    .article-layout { display: block; padding-top: 2rem; }
    .article-toc { position: static; margin: 0 0 1rem; }
    .article-hero-grid { grid-template-columns: minmax(0, 1fr) minmax(220px, 0.6fr); gap: 1.25rem; }
}

@media (max-width: 640px) {
    body { font-size: 16px; }
    .blog-header-inner { min-height: 64px; }
    .blog-brand img { width: 32px; height: 32px; }
    .blog-nav { gap: 0.2rem 0.65rem; }
    .blog-nav a { font-size: 0.8rem; }
    .article-hero { padding: 3.25rem 0 2.75rem; }
    .article-hero-grid { display: block; }
    .article-hero-media { max-width: 520px; margin-top: 1.5rem; }
    .article-meta span + span::before { margin-right: 0.55rem; }
    .article-layout { width: 100%; padding: 1.25rem 0.75rem 3rem; }
    .article-body { padding: 1.2rem; border-radius: 14px; }
    .article-toc { padding: 1rem; }
    .article-diagram { grid-template-columns: 1fr; gap: 0.55rem; padding: 0.75rem; }
    .diagram-arrow { width: 1.75rem; height: 1.75rem; margin: -0.4rem auto; transform: rotate(90deg); line-height: 1.6rem; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }