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.header__nav [data-lang-content]{display:none!important}html[lang=vi] .flex [data-lang-content=vi],html[lang=vi] .grid [data-lang-content=vi],html[lang=vi] .header__nav [data-lang-content=vi]{display:flex!important}html[lang=vi] div[data-lang-content],html[lang=vi] section[data-lang-content],html[lang=vi] p[data-lang-content],html[lang=vi] h1[data-lang-content],html[lang=vi] h2[data-lang-content],html[lang=vi] h3[data-lang-content],html[lang=vi] a[data-lang-content],html[lang=vi] span[data-lang-content],html[lang=vi] li[data-lang-content],html[lang=vi] blockquote[data-lang-content],html[lang=vi] input[data-lang-content],html[lang=vi] button[data-lang-content]{display:none!important}html[lang=vi] div[data-lang-content=vi],html[lang=vi] section[data-lang-content=vi],html[lang=vi] p[data-lang-content=vi],html[lang=vi] h1[data-lang-content=vi],html[lang=vi] h2[data-lang-content=vi],html[lang=vi] h3[data-lang-content=vi],html[lang=vi] a[data-lang-content=vi],html[lang=vi] span[data-lang-content=vi],html[lang=vi] li[data-lang-content=vi],html[lang=vi] blockquote[data-lang-content=vi],html[lang=vi] input[data-lang-content=vi],html[lang=vi] button[data-lang-content=vi]{display:block!important}html[lang=vi] a[data-lang-content=vi],html[lang=vi] span[data-lang-content=vi]{display:inline!important}html[lang=vi] input[data-lang-content=vi],html[lang=vi] button[data-lang-content=vi]{display:inline-block!important}.lang-switcher{position:relative;display:inline-flex;align-items:center}.lang-switcher__current{display:flex;align-items:center;gap:var(--space-1);padding:var(--space-1) var(--space-3);font-size:var(--text-sm);color:var(--color-text-secondary);cursor:pointer;border-radius:var(--radius-md);transition:all var(--transition-fast);-webkit-user-select:none;user-select:none}.lang-switcher__current:hover{background:var(--color-bg-tertiary)}.lang-switcher__dropdown{position:absolute;top:calc(100% + var(--space-2));right:0;background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);min-width:160px;padding:var(--space-2);z-index:var(--z-dropdown);opacity:0;visibility:hidden;transform:translateY(-8px);transition:all var(--transition-base)}.lang-switcher--open .lang-switcher__dropdown{opacity:1;visibility:visible;transform:translateY(0)}.lang-switcher__option{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);font-size:var(--text-sm);color:var(--color-text-secondary);cursor:pointer;border-radius:var(--radius-md);transition:all var(--transition-fast);border:none;background:none;width:100%;text-align:left}.lang-switcher__option:hover{background:var(--color-bg-tertiary);color:var(--color-text)}.lang-switcher__option--active{color:var(--color-primary);font-weight:var(--weight-semibold);background:var(--color-primary-50)}.lang-switcher__flag{font-size:16px}.topbar__langs a{color:#ffffff80;font-size:var(--text-xs);text-decoration:none;cursor:pointer;transition:color var(--transition-fast);padding:2px 4px;border-radius:var(--radius-sm)}.topbar__langs a:hover,.topbar__langs a.active{color:var(--color-text-inverse)}.topbar__langs a.active{background:#ffffff1a}