/* Navigation stays visible at every viewport size. */
html{scroll-padding-top:80px}
.official-header~main section[id]{scroll-margin-top:0}
.official-header{position:sticky;top:0;z-index:100;background:#15191f;border-bottom:1px solid #343941;color:#f5f5f3}
.official-header *{box-sizing:border-box}
.official-header a{text-decoration:none;color:inherit}
.official-header .official-nav{position:relative;display:flex;align-items:center;flex-wrap:nowrap;gap:24px;width:min(1280px,calc(100% - 64px));min-height:68px;margin:0 auto;padding:0}
.official-header .official-brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.official-header .official-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:#ff812b;color:#17191d;font-size:15px;font-weight:800}
.official-header .official-brand strong,.official-header .official-brand small{display:block;line-height:1.5}
.official-header .official-brand strong{font-size:17px}
.official-header .official-brand small{font-size:10px;color:#afb6c0}
.official-header .product-nav{display:flex;align-items:center;gap:24px;margin-left:auto;font-size:13px;font-weight:600}
.official-header .product-nav a{padding:12px 0;white-space:nowrap}
.official-header .official-home-button{font-size:12px;line-height:1.5;border:1px solid #674128;border-radius:7px;padding:10px 13px;background:#30241d;color:#ffac70;white-space:nowrap}
.official-header a:hover{color:#ffad73}
.official-header a:focus-visible{outline:3px solid #ff812b;outline-offset:3px}
@media(max-width:1100px){
 html{scroll-padding-top:12px}
 .official-header{position:relative}
 .official-header .official-nav{display:grid;grid-template-columns:1fr auto;min-height:0;width:calc(100% - 32px);gap:0;padding:7px 0 5px}
 .official-header .official-mark{width:30px;height:30px;border-radius:8px;font-size:13px}
 .official-header .official-brand{gap:8px}
 .official-header .official-brand strong{font-size:15px}
 .official-header .official-brand small{display:none}
 .official-header .official-home-button{grid-column:2;grid-row:1;margin:0;padding:8px 10px;font-size:11px}
 .official-header .product-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-column:1/-1;grid-row:2;order:0;gap:0;width:100%;margin:7px 0 0;padding:3px 0 0;border-top:1px solid #343941;font-size:12px}
 .official-header .product-nav a{display:flex;align-items:center;justify-content:center;min-height:32px;padding:5px 0;line-height:1.5}
 .official-header .course-nav{grid-template-columns:repeat(6,minmax(0,1fr))}
}
@media(max-width:600px){.official-header .course-nav{grid-template-columns:repeat(3,minmax(0,1fr))}}