:root {
    --nb-primary: #b91c1c;
    --nb-primary-dark: #7f1d1d;
    --nb-text-muted: #6b7280;
    --nb-border: #e5e7eb;
    --nb-bg-light: #f8fafc;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background-color: var(--nb-bg-light);
    color: #111827;
}

.nb-navbar { background: #fff; border-bottom: 1px solid var(--nb-border); padding: 0.9rem 0; }
.nb-navbar .navbar-brand { font-weight: 700; color: #111827; }
.nb-navbar .navbar-brand span { color: var(--nb-primary); }
.nb-navbar-links { align-items: center; gap: 1.25rem; }
.nb-navbar-links a { color: #374151; text-decoration: none; font-weight: 500; font-size: 0.95rem; }
.nb-navbar-links a:hover { color: var(--nb-primary); }
.nb-marketplace-link { background: var(--nb-primary); color: #fff !important; padding: 0.4rem 0.9rem; border-radius: 6px; }
.nb-marketplace-link:hover { background: var(--nb-primary-dark); color: #fff !important; }

.nb-hero { background: linear-gradient(135deg, var(--nb-primary), var(--nb-primary-dark)); color: #fff; padding: 3rem 0; text-align: center; }
.nb-hero h1 { font-weight: 700; font-size: 2rem; }
.nb-hero p { opacity: 0.9; max-width: 640px; margin: 0.75rem auto 0; }

.nb-article-card { background: #fff; border: 1px solid var(--nb-border); border-radius: 10px; overflow: hidden; height: 100%; transition: box-shadow 0.15s, transform 0.15s; }
.nb-article-card:hover { box-shadow: 0 8px 20px rgba(0,0,0,0.08); transform: translateY(-2px); }
.nb-article-card img { width: 100%; height: 170px; object-fit: cover; }
.nb-article-card .nb-card-body { padding: 1rem; }
.nb-article-card .nb-badge {
    display: inline-block; font-size: 0.72rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: 0.03em; color: var(--nb-primary); background: rgba(185,28,28,0.08);
    padding: 0.2rem 0.55rem; border-radius: 4px; margin-bottom: 0.5rem;
}
.nb-article-card h3 { font-size: 1.05rem; font-weight: 650; margin-bottom: 0.4rem; }
.nb-article-card p { color: var(--nb-text-muted); font-size: 0.9rem; }

.nb-article-content { line-height: 1.75; font-size: 1.02rem; }
.nb-article-content h2 { margin-top: 2rem; font-size: 1.4rem; }
.nb-article-content h3 { margin-top: 1.5rem; font-size: 1.15rem; }

.nb-footer { background: #111827; color: #9ca3af; padding: 1.5rem 0; margin-top: 3rem; font-size: 0.85rem; text-align: center; }
.nb-footer a { color: #d1d5db; }