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/* Shared site system: navigation, pricing and documentation */
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@media(prefers-reduced-motion:reduce){.button,.header-download{transition:none}}
/* Biến thể text-led khi thiếu ảnh sản phẩm thật (xem includes/site.php: $productImageExists). */
.hero.hero-no-product{grid-template-columns:1fr}
/* Section video hướng dẫn (index.php #tutorials) — thêm cùng quyết định mục 0 câu 2. */
#tutorials video{display:block;width:100%;height:auto;aspect-ratio:16/9;background:#000;border:1px solid var(--line);border-radius:8px}