:root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #101828;
    --muted: #667085;
    --brand: #111827;
    --accent: #2563eb;
    --border: #e5e7eb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(255,255,255,.9);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 14px 6%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.brand {
    font-weight: 800;
    font-size: 20px;
}

nav {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

nav a {
    color: var(--muted);
    font-size: 14px;
}

.shell,
.article-shell {
    width: min(1100px, 92%);
    margin: 0 auto;
    padding: 42px 0;
}

.hero {
    background: linear-gradient(135deg, #111827, #2563eb);
    color: #fff;
    border-radius: 28px;
    padding: 44px;
    margin-bottom: 32px;
}

.hero h1 {
    font-size: clamp(32px, 5vw, 56px);
    line-height: 1.05;
    margin: 0 0 14px;
}

.hero p {
    font-size: 18px;
    max-width: 680px;
    opacity: .9;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 22px;
    box-shadow: 0 12px 30px rgba(16,24,40,.06);
}

.card span,
.pill {
    display: inline-block;
    background: #eef4ff;
    color: #2563eb;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 12px;
}

.card h2 {
    font-size: 20px;
    line-height: 1.25;
}

.card p,
.meta,
.article p,
.article li {
    color: var(--muted);
    line-height: 1.7;
}

.article {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 28px;
    padding: 38px;
    max-width: 820px;
    margin: 0 auto;
}

.article h1 {
    font-size: clamp(30px, 5vw, 48px);
    line-height: 1.1;
}

.product-banner {
    margin: 32px 0;
    padding: 24px;
    border-radius: 22px;
    background: #111827;
    color: #fff;
}

.product-banner p {
    color: rgba(255,255,255,.82);
}

.product-banner a {
    display: inline-block;
    margin-top: 8px;
    background: #fff;
    color: #111827;
    padding: 10px 14px;
    border-radius: 12px;
    font-weight: 700;
}

@media (max-width: 820px) {
    .site-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    .hero,
    .article {
        padding: 24px;
        border-radius: 20px;
    }
}