:root {
    --nf-bg: #f8fafc;
    --nf-surface: #ffffff;
    --nf-fg: #0f172a;
    --nf-muted: #64748b;
    --nf-accent: #2563eb;
    --nf-accent-hover: #1d4ed8;
    --nf-border: #e2e8f0;
    --nf-radius: 14px;
    --nf-shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 8px 24px rgba(15, 23, 42, .06);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Inter", -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--nf-fg);
    background: var(--nf-bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--nf-accent); text-decoration: none; }
a:hover { color: var(--nf-accent-hover); }

.container { max-width: 1040px; margin: 0 auto; padding: 0 24px; }

/* Шапка */
.site-header {
    background: rgba(255, 255, 255, .85);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--nf-border);
    position: sticky;
    top: 0;
    z-index: 100;
}
.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.site-logo {
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -.02em;
    color: var(--nf-fg);
}
.site-logo span { color: var(--nf-accent); }
.site-nav { display: flex; gap: 24px; }
.site-nav a {
    color: var(--nf-muted);
    font-weight: 500;
    font-size: .95rem;
    transition: color .15s;
}
.site-nav a:hover { color: var(--nf-accent); }

/* Контент */
.site-main { min-height: 65vh; padding: 48px 0 72px; }

.page-content { color: #334155; font-size: 1.05rem; }
.page-content > * + * { margin-top: 1em; }
.page-content p { margin: 0 0 1.1em; }
.page-content h1, .page-content h2, .page-content h3, .page-content h4,
.page-content h5, .page-content h6 {
    color: var(--nf-fg);
    line-height: 1.3;
    letter-spacing: -.01em;
    font-weight: 700;
}
.page-content h1 { font-size: 1.9em; margin: 1.4em 0 .6em; }
.page-content h2 { font-size: 1.55em; margin: 1.5em 0 .6em; padding-bottom: .35em; border-bottom: 1px solid var(--nf-border); }
.page-content h3 { font-size: 1.25em; margin: 1.4em 0 .5em; }
.page-content h4 { font-size: 1.1em; margin: 1.3em 0 .5em; }
.page-content h5 { font-size: 1em; margin: 1.2em 0 .4em; }
.page-content h6 { font-size: .88em; margin: 1.2em 0 .4em; color: var(--nf-muted); text-transform: uppercase; letter-spacing: .03em; }
.page-content ul, .page-content ol { margin: 0 0 1.2em; padding-left: 1.6em; }
.page-content li { margin-bottom: .4em; }
.page-content a { text-decoration: underline; text-underline-offset: 2px; }
.page-content img { max-width: 100%; height: auto; border-radius: 12px; margin: 20px 0; }
.page-content blockquote {
    margin: 1.5em 0;
    padding: 14px 20px;
    border-left: 4px solid var(--nf-accent);
    background: #eff6ff;
    border-radius: 0 10px 10px 0;
    color: #334155;
}
.page-content code {
    background: #f1f5f9;
    color: #be185d;
    padding: 2px 7px;
    border-radius: 6px;
    font-size: .9em;
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
.page-content pre {
    background: #0f172a;
    color: #e2e8f0;
    padding: 18px;
    border-radius: 12px;
    overflow-x: auto;
    font-size: .9em;
    line-height: 1.5;
}
.page-content pre code { background: transparent; color: inherit; padding: 0; }
.page-content table { width: 100%; border-collapse: collapse; margin: 1.5em 0; }
.page-content th, .page-content td { border: 1px solid var(--nf-border); padding: 10px 14px; text-align: left; }
.page-content th { background: #f8fafc; font-weight: 600; }
.page-content hr { border: none; border-top: 1px solid var(--nf-border); margin: 2em 0; }

/* Заголовки страниц */
.page-title { font-size: 2.2rem; letter-spacing: -.03em; margin: 0 0 8px; }
.page-subtitle { color: var(--nf-muted); margin: 0 0 32px; }

/* Блог */
.blog-title { font-size: 2rem; letter-spacing: -.03em; margin: 0 0 32px; }
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}
.blog-card {
    background: var(--nf-surface);
    border: 1px solid var(--nf-border);
    border-radius: var(--nf-radius);
    overflow: hidden;
    box-shadow: var(--nf-shadow);
    display: flex;
    flex-direction: column;
    transition: transform .18s ease, box-shadow .18s ease;
}
.blog-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(15, 23, 42, .12); }
.blog-card__thumb {
    display: block;
    height: 180px;
    background: linear-gradient(135deg, #dbeafe, #ede9fe);
    overflow: hidden;
}
.blog-card__thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.blog-card__body { padding: 20px 22px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.blog-card__meta {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--nf-muted);
    font-size: .82rem;
}
.blog-card__cat {
    background: #eff6ff;
    color: var(--nf-accent);
    padding: 3px 10px;
    border-radius: 999px;
    font-weight: 600;
    font-size: .78rem;
}
.blog-card__title { margin: 0; font-size: 1.2rem; letter-spacing: -.01em; }
.blog-card__title a { color: var(--nf-fg); }
.blog-card__title a:hover { color: var(--nf-accent); }
.blog-card__excerpt { color: var(--nf-muted); font-size: .92rem; margin: 0; flex: 1; }

/* Отдельная запись */
.blog-post .post-meta {
    display: flex;
    gap: 16px;
    align-items: center;
    color: var(--nf-muted);
    font-size: .88rem;
    margin: 0 0 28px;
}
.blog-post h1 { font-size: 2.4rem; letter-spacing: -.03em; margin: 0 0 12px; }
.post-cover { width: 100%; max-height: 420px; object-fit: cover; border-radius: var(--nf-radius); margin-bottom: 28px; }
.back-link { display: inline-block; margin-top: 36px; font-weight: 600; }

/* Пустое состояние */
.empty { text-align: center; color: var(--nf-muted); padding: 64px 0; }

/* 404 */
.not-found { text-align: center; padding: 80px 0; }
.not-found h1 { font-size: 5rem; margin: 0; color: var(--nf-accent); }

/* Подвал */
.site-footer {
    border-top: 1px solid var(--nf-border);
    padding: 32px 0;
    color: var(--nf-muted);
    font-size: .88rem;
    background: var(--nf-surface);
}
.site-footer .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }

/* Кнопки */
.btn {
    display: inline-block;
    background: var(--nf-accent);
    color: #fff;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    transition: background .15s;
}
.btn:hover { background: var(--nf-accent-hover); color: #fff; }

/* Адаптив */
@media (max-width: 640px) {
    .site-nav { gap: 14px; }
    .page-title, .blog-post h1 { font-size: 1.7rem; }
    .blog-grid { grid-template-columns: 1fr; }
}