:root{ --ysb-primary:#0d6efd; --ysb-dark:#0b1220; --ysb-muted:#6c757d; }
html{ scroll-behavior:smooth; }
body{ font-feature-settings:'kern' 1; }
.header-hero{ position:relative; min-height: 80vh; display:flex; align-items:center; color:#fff; }
.header-hero.parallax{ background-attachment: fixed; background-size: cover; background-position: center; }
@media (max-width: 991.98px){ .header-hero.parallax{ background-attachment: scroll; } }
.header-hero::before{ content:''; position:absolute; inset:0; background:linear-gradient(180deg, rgba(11,18,32,.65), rgba(11,18,32,.4)); }
.header-hero > .container{ position:relative; z-index:1; }
.section{ padding:4.5rem 0; }
.section-light{ background:#f8f9fa; }
.card.shadow-soft{ box-shadow:0 10px 30px rgba(13,27,62,.08); }
.stat{ font-weight:700; font-size: clamp(1.5rem, 1.1rem + 2vw, 2.75rem); }
.badge-soft{ background:rgba(13,110,253,.12); color:#0d6efd; border:1px solid rgba(13,110,253,.25); }
.toc a{ text-decoration:none; }
blockquote{ border-left:4px solid var(--ysb-primary); padding-left:1rem; color:#555; }
code.kbd{ background:#f1f3f5; padding:.2rem .4rem; border-radius:.25rem; }
.footer a:hover{ text-decoration:underline; }