.nav-search-btn{display:flex;align-items:center;gap:var(--space-2);height:40px;padding:0 var(--space-3);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-full);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast);-webkit-tap-highlight-color:transparent}.nav-search-btn:hover{border-color:var(--color-brand);background:var(--color-brand-subtle)}.nav-search-btn:focus-visible{outline:2px solid var(--color-brand);outline-offset:2px}.nav-search-shortcut{font-size:var(--text-caption);color:var(--color-text-tertiary);font-family:var(--font-mono)}@media (max-width:1023px){.nav-search-shortcut{display:none}}.lang-switcher{position:relative;display:none}@media (min-width:1024px){.lang-switcher{display:block}}.lang-toggle{display:flex;align-items:center;gap:var(--space-2);height:40px;padding:0 var(--space-4);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast);-webkit-tap-highlight-color:transparent}.lang-toggle:hover{border-color:var(--color-brand);background:var(--color-brand-subtle)}.lang-toggle:focus-visible{outline:2px solid var(--color-brand);outline-offset:2px}.lang-icon{color:var(--color-text-secondary);flex-shrink:0}.lang-current{font-size:var(--text-small);font-weight:var(--font-medium);color:var(--color-text-primary)}.lang-arrow{color:var(--color-text-tertiary);transition:transform .25s cubic-bezier(.4,0,.2,1)}.lang-switcher:hover .lang-arrow{transform:rotate(180deg)}.lang-dropdown{position:absolute;top:calc(100% + 8px);right:0;min-width:140px;background:var(--color-bg-primary);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:0 4px 6px -1px rgba(0,0,0,.08),0 10px 15px -3px rgba(0,0,0,.06),0 20px 25px -5px rgba(0,0,0,.04);opacity:0;visibility:hidden;transform:translateY(-8px) scale(.96);transition:opacity .2s cubic-bezier(.4,0,.2,1),visibility .2s,transform .25s cubic-bezier(.16,1,.3,1);z-index:var(--z-dropdown);overflow:hidden}.lang-switcher:hover .lang-dropdown{opacity:1;visibility:visible;transform:translateY(0) scale(1)}.lang-option{display:block;padding:var(--space-3) var(--space-5);font-size:var(--text-body);color:var(--color-text-primary);text-decoration:none;transition:all var(--transition-fast);line-height:1.5;text-align:center;white-space:nowrap;-webkit-tap-highlight-color:transparent}.lang-option:first-child{padding-top:var(--space-4)}.lang-option:last-child{padding-bottom:var(--space-4)}.lang-option:hover:not(.active){background:var(--color-bg-secondary)}.lang-option:focus-visible{outline:2px solid var(--color-brand);outline-offset:-2px}.lang-option.active{color:var(--color-brand);font-weight:var(--font-semibold)}.lang-option.active,.lang-option.active:hover{background:var(--color-brand-subtle)}.theme-icon{color:var(--color-text-primary)}[data-theme=dark] .sun-icon{display:block}.theme-icon,[data-theme=dark] .moon-icon{display:none}:not([data-theme=dark]) .sun-icon{display:none}:not([data-theme=dark]) .moon-icon{display:block}.mobile-menu-btn{position:relative}.close-icon,.menu-icon{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);transition:opacity var(--transition-fast)}.mobile-menu.open+.mobile-menu-btn .menu-icon{opacity:0}.mobile-menu.open+.mobile-menu-btn .close-icon{opacity:1}:not(.mobile-menu.open)+.mobile-menu-btn .menu-icon{opacity:1}:not(.mobile-menu.open)+.mobile-menu-btn .close-icon{opacity:0}.mobile-lang-switcher{display:flex;gap:var(--space-3);padding:var(--space-4)0;border-top:1px solid var(--color-border);margin-top:var(--space-4)}.mobile-lang-option{flex:1;padding:var(--space-3) var(--space-4);text-align:center;font-size:var(--text-body);color:var(--color-text-primary);text-decoration:none;background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-md);transition:all var(--transition-fast);-webkit-tap-highlight-color:transparent}.mobile-lang-option:hover{background:var(--color-brand-subtle);border-color:var(--color-brand);color:var(--color-brand)}.mobile-lang-option:focus-visible{outline:2px solid var(--color-brand);outline-offset:2px}.mobile-lang-option.active{background:var(--color-brand);border-color:var(--color-brand);color:var(--color-text-inverse);font-weight:var(--font-semibold)}.search-modal{position:fixed;top:0;left:0;right:0;bottom:0;z-index:9999;opacity:0;visibility:hidden;transition:opacity .25s cubic-bezier(.4,0,.2,1),visibility .25s}.search-modal.open{opacity:1;visibility:visible}.search-modal-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.5);backdrop-filter:blur(4px)}.search-modal-content{position:relative;max-width:600px;margin:100px auto 0;background:var(--color-bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);overflow:hidden;transform:translateY(-16px) scale(.97);transition:transform .3s cubic-bezier(.16,1,.3,1)}.search-modal.open .search-modal-content{transform:translateY(0) scale(1)}.search-modal-header{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4);border-bottom:1px solid var(--color-border)}.search-modal-icon{color:var(--color-text-tertiary);flex-shrink:0}.search-modal-input{flex:1;font-size:var(--text-lg);font-family:var(--font-body);border:0;background:0 0;color:var(--color-text-primary);outline:0}.search-modal-input::placeholder{color:var(--color-text-tertiary)}.search-modal-close{padding:var(--space-2);background:var(--color-bg-secondary);border:0;border-radius:var(--radius-sm);color:var(--color-text-tertiary);cursor:pointer;transition:all var(--transition-fast);-webkit-tap-highlight-color:transparent}.search-modal-close:hover{background:var(--color-border);color:var(--color-text-primary)}.search-modal-close:focus-visible{outline:2px solid var(--color-brand);outline-offset:2px}.search-modal-results{max-height:400px;overflow-y:auto}.search-modal-empty{padding:var(--space-8);text-align:center;color:var(--color-text-tertiary)}.search-modal-item{display:block;padding:var(--space-4);border-bottom:1px solid var(--color-border);text-decoration:none;transition:background var(--transition-fast);-webkit-tap-highlight-color:transparent}.search-modal-item:last-child{border-bottom:none}.search-modal-item.selected,.search-modal-item:hover{background:var(--color-brand-subtle)}.search-modal-item:focus-visible{outline:2px solid var(--color-brand);outline-offset:-2px}.search-modal-item-section,.search-modal-item-title{font-size:var(--text-caption);color:var(--color-brand);margin-bottom:var(--space-1)}.search-modal-item-title{font-size:var(--text-body);font-weight:var(--font-semibold);color:var(--color-text-primary)}.search-modal-item-desc{font-size:var(--text-small);color:var(--color-text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.search-modal-footer{padding:var(--space-3) var(--space-4);border-top:1px solid var(--color-border);background:var(--color-bg-secondary)}.search-modal-hint{font-size:var(--text-caption);color:var(--color-text-tertiary)}.search-modal-hint kbd{display:inline-block;padding:2px 6px;font-size:var(--text-caption);font-family:var(--font-mono);background:var(--color-bg-primary);border:1px solid var(--color-border);border-radius:var(--radius-sm);margin:0 2px}