/* 导航字标左侧 Logo 与右侧注册标：原图保持，明暗适配仅在显示层处理。 */
.site-header .wordmark{display:inline-flex;align-items:center;gap:10px;justify-self:start}
.site-header .wordmark-label{display:block}
.site-header .header-logo{display:block;width:48px;height:48px;max-width:none;flex:0 0 auto;object-fit:contain;filter:invert(1);mix-blend-mode:multiply}
body.particle-header-dark .site-header .header-logo{filter:none;mix-blend-mode:screen}
@media(max-width:760px){.site-header .wordmark{gap:8px}.site-header .header-logo{width:38px;height:38px}}
@media(max-width:360px){.site-header .wordmark{gap:7px}.site-header .header-logo{width:34px;height:34px}}

.site-header .wordmark-registered{font-size:.48em;font-weight:500;vertical-align:super;line-height:0;margin-left:2px;letter-spacing:0;position:relative;top:-.24em}

/* 手机导航三等分，老师入口位于内容区正中。 */
.site-header nav a[href="#author"]{text-align:center}
@media(max-width:760px){
 .site-header nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;justify-content:normal}
 .site-header nav a{justify-self:start}
 .site-header nav a:nth-child(2){justify-self:center}
 .site-header nav a:last-child{justify-self:end}
}