.language-selector{align-items:center;display:flex;gap:8px}.language-selector .form-label{color:var(--color-text-secondary);font-size:.875rem;margin:0}.language-selector .select-base{background:var(--color-background);border:1px solid var(--color-border);border-radius:4px;color:var(--color-text);cursor:pointer;font-size:.875rem;min-width:120px;padding:4px 8px}.language-selector .select-base:focus{outline:2px solid var(--color-primary);outline-offset:2px}.language-selector .select-base:hover{border-color:var(--color-primary)}.header__language{margin-left:8px}.header__language .select-base{background:var(--color-background-elevated);border-color:var(--color-border-subtle)}@media (max-width:768px){.header__language{margin-left:4px}.language-selector .select-base{font-size:.8rem;min-width:100px}}[data-theme=dark] .language-selector .select-base{background:var(--color-background-elevated);border-color:var(--color-border-subtle);color:var(--color-text)}[data-theme=dark] .language-selector .select-base:hover{border-color:var(--color-primary)}[dir=rtl]{text-align:right}[dir=rtl] .header__actions,[dir=rtl] .header__content,[dir=rtl] .mobile-tabbar,[dir=rtl] .mobile-tabbar__btn,[dir=rtl] .nav{flex-direction:row-reverse}.lang-ja{font-family:Hiragino Sans,Yu Gothic,Meiryo,MS Gothic,sans-serif}.lang-ja .header__title{font-weight:500}.lang-ja .furigana-text{line-height:1.6}.lang-ja .japanese-text{font-feature-settings:"palt" 1,"kern" 1;text-rendering:optimizeLegibility}.language-selector{position:relative}.language-selector select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='currentColor' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' viewBox='0 0 24 24'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-position:right 8px center;background-repeat:no-repeat;background-size:16px;padding-right:32px}[dir=rtl] .language-selector select{background-position:left 8px center;padding-left:32px;padding-right:8px}@media (max-width:768px){.language-selector select{font-size:14px;padding:4px 24px 4px 8px}[dir=rtl] .language-selector select{padding:4px 8px 4px 24px}}.lang-ja .syllabus-topic{line-height:1.7}.lang-ja .example-sentence{line-height:1.8}.lang-ja h1,.lang-ja h2,.lang-ja h3{font-weight:600;letter-spacing:-.02em}.lang-ja li,.lang-ja p{line-height:1.7}.lang-ja .number{font-variant-numeric:tabular-nums}.language-transition{transition:opacity .2s ease-in-out}.language-transition.changing{opacity:.7}.language-selector:focus-within{border-radius:4px;outline:2px solid var(--color-primary);outline-offset:2px}[data-high-contrast] .language-selector select{border:2px solid}[data-reduce-motion] .language-transition{transition:none}[data-compact] .language-selector select{font-size:12px;padding:2px 20px 2px 6px}[data-compact][dir=rtl] .language-selector select{padding:2px 6px 2px 20px}