/* /blog — index + post styling. Long-form readable typography. */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Source+Serif+4:opsz,wght@8..60,400;8..60,600&display=swap');

:root {
    --primary: #6366F1;
    --primary-hover: #4F46E5;
    --bg-base: #FFFFFF;
    --bg-soft: #F8F9FB;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #64748B;
    --border-subtle: rgba(15, 23, 42, 0.08);
    --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04), 0 4px 16px rgba(15, 23, 42, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg-soft);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; transition: color 0.15s; }
a:hover { color: var(--primary-hover); }

.topbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 18px 28px;
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-base);
    border-bottom: 1px solid var(--border-subtle);
}
.brand { display: inline-flex; align-items: center; gap: 8px; color: var(--text-primary); font-weight: 700; font-size: 1.05rem; text-decoration: none; }
.brand-icon { font-size: 1.1rem; }
.topbar-nav { display: flex; gap: 22px; align-items: center; }
.topbar-nav a { color: var(--text-secondary); font-weight: 500; font-size: 0.95rem; text-decoration: none; }
.topbar-nav a:hover { color: var(--text-primary); }
.signin-link {
    background: var(--text-primary);
    color: #fff !important;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
}

/* ─── Blog index ──────────────────────── */
.blog-main {
    max-width: 760px;
    margin: 0 auto;
    padding: 56px 24px 80px;
}
.blog-header { margin-bottom: 48px; }
.eyebrow {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.blog-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.2;
}
.blog-sub {
    color: var(--text-secondary);
    margin-top: 12px;
    font-size: 1.1rem;
}

.post-list { display: flex; flex-direction: column; gap: 20px; }
.post-card {
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    box-shadow: var(--shadow-card);
    transition: transform 0.15s, box-shadow 0.15s;
}
.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 24px rgba(15, 23, 42, 0.10);
}
.post-link {
    display: block;
    padding: 24px 28px;
    color: inherit;
    text-decoration: none;
}
.post-link:hover { color: inherit; }
.post-card h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.3;
}
.post-summary {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 12px;
}
.post-meta {
    display: flex;
    gap: 12px;
    color: var(--text-tertiary);
    font-size: 0.82rem;
}
.post-meta span:not(:last-child)::after {
    content: '·';
    margin-left: 12px;
    color: var(--text-muted);
}

.cta-block {
    margin-top: 56px;
    padding: 32px;
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    text-align: center;
}
.cta-block p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}
.cta-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}
.cta-button {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    background: var(--primary);
    color: #fff !important;
    text-decoration: none;
    box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}
.cta-button:hover { background: var(--primary-hover); }
.cta-secondary {
    background: var(--bg-base);
    color: var(--primary) !important;
    border: 1px solid var(--border-subtle);
    box-shadow: none;
}

/* ─── Post detail ─────────────────────── */
.post-main {
    max-width: 720px;
    margin: 0 auto;
    padding: 48px 24px 64px;
}
.post-eyebrow {
    margin-bottom: 16px;
}
.post-eyebrow a {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    text-decoration: none;
}
.post-eyebrow a:hover { color: var(--primary); }
.post-article h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 12px;
}
.post-meta-line {
    color: var(--text-tertiary);
    font-size: 0.92rem;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-subtle);
}
.post-lede {
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 1.2rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 28px;
    font-weight: 400;
}
.post-article h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 40px;
    margin-bottom: 14px;
    letter-spacing: -0.01em;
}
.post-article p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 18px;
}
.post-article ul {
    margin: 12px 0 18px 24px;
    color: var(--text-secondary);
    font-size: 1.05rem;
}
.post-article li {
    margin-bottom: 6px;
}
.post-article strong {
    color: var(--text-primary);
    font-weight: 600;
}
.post-divider {
    border: none;
    border-top: 1px solid var(--border-subtle);
    margin: 40px 0;
}
.post-disclaimer {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 16px 20px;
}
.post-cta {
    margin-top: 40px;
    padding: 28px;
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    text-align: center;
}
.post-cta h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.post-cta p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

/* ─── Footer ──────────────────────────── */
.page-foot {
    background: var(--bg-base);
    border-top: 1px solid var(--border-subtle);
    margin-top: 48px;
}
.foot-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-tertiary);
    font-size: 0.88rem;
}

@media (max-width: 600px) {
    .topbar { padding: 14px 16px; }
    .topbar-nav { gap: 0; }
    .topbar-nav a:not(.signin-link) { display: none; }
    .blog-main { padding: 36px 18px 60px; }
    .blog-header h1 { font-size: 1.8rem; }
    .post-link { padding: 20px; }
    .post-main { padding: 28px 18px 48px; }
    .post-article h1 { font-size: 1.7rem; }
    .post-article h2 { font-size: 1.2rem; }
    .post-lede { font-size: 1.08rem; }
    .post-article p, .post-article ul { font-size: 0.98rem; }
    .foot-inner { flex-direction: column; gap: 6px; align-items: flex-start; }
}