.lang-switcher{position:relative;display:inline-flex;align-items:center;flex-shrink:0}.lang-switcher-btn{background:#fff0;border:1.5px solid #06c;color:#06c;padding:5px 12px;border-radius:5px;cursor:pointer;font-size:14px;font-family:inherit;display:inline-flex;align-items:center;gap:5px;white-space:nowrap;transition:background 0.2s,color 0.2s}.lang-switcher-btn:hover,.lang-switcher-btn:focus{background:#06c;color:#fff;outline:none}.lang-switcher-btn .chevron{font-size:10px;transition:transform 0.2s}.lang-switcher.open .chevron{transform:rotate(180deg)}.lang-switcher-menu{display:none;position:absolute;top:calc(100% + 4px);right:0;background:#fff;border:1px solid #e2e8f0;border-radius:6px;box-shadow:0 4px 12px rgb(0 0 0 / .12);list-style:none;padding:4px 0;margin:0;min-width:140px;z-index:10001}.lang-switcher.open .lang-switcher-menu{display:block}.lang-switcher-menu li{margin:0;padding:8px 16px;color:#333;font-size:14px;cursor:pointer;white-space:nowrap;transition:background 0.15s}.lang-switcher-menu li:hover{background:#f0f4f8;color:#06c}.lang-switcher-menu li.active{font-weight:600;color:#06c;background:#f0f4f8}body.lang-active details.lang-en,body.lang-active details.lang-ja{display:none!important}body.lang-active .lang-zh{display:block}body.show-en .lang-zh{display:none!important}body.show-en details.lang-en{display:block!important;border:none;padding:0;margin:0;background:#fff0}body.show-en details.lang-en>summary{display:none}body.show-ja .lang-zh{display:none!important}body.show-ja details.lang-ja{display:block!important;border:none;padding:0;margin:0;background:#fff0}body.show-ja details.lang-ja>summary{display:none}body.dark-mode .lang-switcher-btn{border-color:#6db3f2;color:#6db3f2}body.dark-mode .lang-switcher-btn:hover,body.dark-mode .lang-switcher-btn:focus{background:#6db3f2;color:#1a1a2e}body.dark-mode .lang-switcher-menu{background:#16213e;border-color:#2d2d3f}body.dark-mode .lang-switcher-menu li{color:#e0e0e0}body.dark-mode .lang-switcher-menu li:hover{background:#2d2d3f;color:#6db3f2}body.dark-mode .lang-switcher-menu li.active{color:#6db3f2;background:#2d2d3f}@media (max-width:768px){.lang-switcher-btn{padding:6px 10px;font-size:13px}}