/* ===================================
   ふりがな (Furigana) スタイル
   =================================== */

/* Ruby タグの基本スタイル */
ruby {
    ruby-align: center;
}

ruby rt {
    font-size: 0.55em;
    color: #cc5588;
    font-weight: 400;
    letter-spacing: 0.02em;
    user-select: none;
    opacity: 1;
    transition: opacity 0.3s ease;
}

/* ふりがな非表示モード */
body.furigana-hidden ruby rt {
    opacity: 0;
    font-size: 0;
    line-height: 0;
    overflow: hidden;
    height: 0;
    display: inline;
    transition: all 0.3s ease;
}

/* ふりがなトグルボタン */
.furigana-toggle-btn {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 10000;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: linear-gradient(135deg, #ff6b9d 0%, #ff8fab 100%);
    color: #fff;
    border: none;
    border-radius: 50px;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(255, 107, 157, 0.4);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    letter-spacing: 0.05em;
    white-space: nowrap;
    user-select: none;
}

.furigana-toggle-btn:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 8px 30px rgba(255, 107, 157, 0.55);
}

.furigana-toggle-btn:active {
    transform: translateY(-1px) scale(0.98);
}

.furigana-toggle-btn .toggle-icon {
    font-size: 1.1rem;
    transition: transform 0.3s ease;
}

.furigana-toggle-btn.is-off {
    background: linear-gradient(135deg, #9e9e9e 0%, #bdbdbd 100%);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.furigana-toggle-btn.is-off:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
}

.furigana-toggle-btn .toggle-icon.is-off {
    transform: rotate(180deg);
}

/* ローディングインジケーター */
.furigana-toggle-btn.is-loading {
    opacity: 0.8;
}

.furigana-toggle-btn.is-loading .toggle-icon {
    animation: furigana-spin 1s linear infinite;
}

@keyframes furigana-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ふりがな変換中のプレースホルダー */
.furigana-loading-indicator {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10001;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: 24px 40px;
    border-radius: 16px;
    box-shadow: 0 12px 40px rgba(255, 107, 157, 0.25);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    font-family: 'Noto Sans JP', sans-serif;
    animation: furigana-fadeIn 0.3s ease;
}

.furigana-loading-indicator .loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(255, 107, 157, 0.2);
    border-top: 3px solid #ff6b9d;
    border-radius: 50%;
    animation: furigana-spin 0.8s linear infinite;
}

.furigana-loading-indicator .loading-text {
    color: #8b4b6b;
    font-size: 0.9rem;
    font-weight: 500;
}

@keyframes furigana-fadeIn {
    from { opacity: 0; transform: translate(-50%, -50%) scale(0.9); }
    to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

@keyframes furigana-fadeOut {
    from { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    to { opacity: 0; transform: translate(-50%, -50%) scale(0.9); }
}

/* レスポンシブ */
@media (max-width: 768px) {
    .furigana-toggle-btn {
        bottom: 16px;
        right: 16px;
        padding: 8px 14px;
        font-size: 0.78rem;
    }
}

/* ruby がサポートされていないブラウザ用フォールバック */
ruby > rp {
    display: none;
}