.landing-navigation[data-v-a481ceca]{display:flex;align-items:center;justify-content:center;gap:8px}.navigation-desktop[data-v-a481ceca]{display:flex;align-items:center;gap:8px}.navigation-mobile[data-v-a481ceca]{display:none}.navigation-menu-toggle[data-v-a481ceca]{display:grid;place-items:center;width:44px;height:44px;border-radius:var(--radius-control-inner);color:var(--edu-text-primary)}.navigation-menu-toggle svg[data-v-a481ceca]{width:24px;height:24px}.navigation-menu-toggle[data-v-a481ceca]:hover,.navigation-menu-toggle[aria-expanded=true][data-v-a481ceca]{background:var(--edu-surface-page)}.navigation-menu-toggle[data-v-a481ceca]:focus-visible{outline:2px solid var(--edu-focus-ring);outline-offset:2px}.navigation-trigger[data-v-a481ceca]{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:8px 14px;border-radius:var(--radius-control-inner);color:var(--edu-text-primary);font-size:14px;font-weight:550;text-decoration:none;transition:background-color .16s}.navigation-trigger[data-v-a481ceca]:hover,.navigation-trigger[aria-expanded=true][data-v-a481ceca]{background:var(--edu-surface-page)}.navigation-trigger[data-v-a481ceca]:focus-visible{outline:2px solid var(--edu-focus-ring);outline-offset:2px}.navigation-intro[data-v-a481ceca]{margin:8px 10px 12px;color:var(--edu-text-muted);font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase}@media (max-width: 639px){.navigation-desktop[data-v-a481ceca]{display:none}.navigation-mobile[data-v-a481ceca]{display:block}.navigation-mobile[data-v-a481ceca] .study-header-menu-surface{--popover-max-height: min(640px, calc(100dvh - var(--popover-top, 56px) - 26px))}.navigation-mobile-group+.navigation-mobile-group[data-v-a481ceca]{margin-top:12px;padding-top:8px;border-top:1px solid var(--edu-border-decorative)}.navigation-mobile-articles[data-v-a481ceca]{justify-content:space-between;margin-top:8px;border-top:1px solid var(--edu-border-decorative);font-size:14px;font-weight:600}}@media (prefers-reduced-motion: reduce){.navigation-trigger[data-v-a481ceca]{transition:none}}.landing-header__bar[data-v-76a4afbc]{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;min-height:64px;padding:8px 16px;border:1px solid rgb(var(--edu-surface-card-rgb) / .65);border-radius:var(--radius-shell);background:rgb(var(--edu-surface-card-rgb) / .7);box-shadow:0 4px 20px rgb(var(--edu-shadow-ink-rgb) / .035);backdrop-filter:blur(20px) saturate(135%)}@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))){.landing-header__bar[data-v-76a4afbc]{background:var(--edu-surface-card);border-color:var(--edu-border-decorative)}}.landing-header__brand[data-v-76a4afbc]{min-width:0}.landing-brand[data-v-76a4afbc]{display:inline-flex;align-items:center;gap:10px;min-height:44px;border-radius:var(--radius-control-inner);font-size:20px;font-weight:700;letter-spacing:-.035em;color:var(--edu-text-primary)}.landing-brand[data-v-76a4afbc]:focus-visible{outline:2px solid var(--edu-focus-ring);outline-offset:4px}.landing-header__account[data-v-76a4afbc]{display:flex;justify-content:flex-end}@media (max-width: 639px){.landing-header__bar[data-v-76a4afbc]{grid-template-columns:minmax(0,1fr) auto 44px;gap:8px;min-height:60px;padding:8px;border-radius:var(--radius-control)}.landing-header__navigation[data-v-76a4afbc]{grid-column:3;grid-row:1}.landing-header__account[data-v-76a4afbc]{grid-column:2;grid-row:1}.landing-brand[data-v-76a4afbc]{gap:6px;font-size:16px}.landing-brand img[data-v-76a4afbc]{width:26px;height:26px}.landing-header__account[data-v-76a4afbc] .edu-button{min-height:44px;padding-inline:12px;font-size:13px}}