/* ===================================================
   ContentFreaks UI Enhancement CSS
   - トップに戻るボタン
   - SNSシェアボタン
   - お気に入り機能
   - パンくずナビ
   =================================================== */

/* ===== 1. トップに戻るボタン ===== */

.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary-400, #f7ff0b);
    color: var(--color-text-primary, #1a202c);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background 0.2s ease;
    z-index: 999;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    background: var(--color-accent-400, #ff6b35);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.3);
}

.scroll-to-top:active {
    transform: translateY(-1px);
}

/* ===== 2. SNSシェアボタン ===== */

.share-buttons {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.share-buttons-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary, #4a5568);
    margin-right: 0.5rem;
    white-space: nowrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.8125rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.share-btn-x {
    background: #000000;
    color: #ffffff;
}

.share-btn-x:hover {
    background: #1a1a1a;
    color: #ffffff;
}

.share-btn-line {
    background: #06C755;
    color: #ffffff;
}

.share-btn-line:hover {
    background: #05b34c;
    color: #ffffff;
}

.share-btn-copy {
    background: var(--color-bg-secondary, #f7fafc);
    color: var(--color-text-primary, #1a202c);
    border: 1px solid var(--color-border-light, #e2e8f0);
}

.share-btn-copy:hover {
    background: var(--color-primary-400, #f7ff0b);
    color: var(--color-text-primary, #1a202c);
    border-color: var(--color-primary-400, #f7ff0b);
}

.share-btn-copy.copied {
    background: #06C755;
    color: #fff;
    border-color: #06C755;
}

/* ===== 4. お気に入りボタン（無効化済み） ===== */

/* ===== 5. パンくずナビ ===== */

.breadcrumb-nav {
    padding: 1rem 0;
    margin-bottom: 0.5rem;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.8125rem;
    flex-wrap: wrap;
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb-list li:not(:last-child)::after {
    content: '›';
    color: var(--color-text-tertiary, #718096);
    font-size: 1rem;
}

.breadcrumb-list a {
    color: var(--color-text-secondary, #4a5568);
    text-decoration: none;
    transition: color 0.2s ease;
}

.breadcrumb-list a:hover {
    color: var(--color-primary-400, #f7ff0b);
}

.breadcrumb-list .current {
    color: var(--color-text-primary, #1a202c);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 300px;
}

/* ===== レスポンシブ ===== */

@media (max-width: 768px) {
    .scroll-to-top {
        bottom: 4.5rem; /* mobile-listen-bar(~50px)の上に配置 */
        right: 1rem;
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .share-buttons {
        flex-direction: column;
        align-items: flex-start;
    }

    .share-buttons-title {
        margin-bottom: 0.25rem;
    }

    .share-btn {
        width: 100%;
        justify-content: center;
    }

    .breadcrumb-list .current {
        max-width: 180px;
    }
}

/* ===== 6. 検索ローディング ===== */

.search-clear-btn {
    position: absolute;
    right: 52px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    background: var(--color-bg-secondary, #f7fafc);
    color: var(--color-text-secondary, #4a5568);
    font-size: 1.125rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    z-index: 2;
}

.search-clear-btn:hover {
    background: var(--color-accent-400, #ff6b35);
    color: #fff;
}

.search-loading-indicator {
    display: flex;
    justify-content: center;
    padding: 3rem 0;
    grid-column: 1 / -1;
}

.search-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(255, 255, 255, 0.15);
    border-top-color: var(--color-primary-400, #f7ff0b);
    border-radius: 50%;
    animation: search-spin 0.7s linear infinite;
}

@keyframes search-spin {
    to { transform: rotate(360deg); }
}

.episodes-grid.is-searching > .episode-card {
    opacity: 0.3;
    pointer-events: none;
}

/* ===== 7. ネイティブシェアボタン ===== */

.share-btn-native {
    background: linear-gradient(135deg, var(--color-primary-400, #f7ff0b), var(--color-accent-400, #ff6b35));
    color: var(--color-text-primary, #1a202c);
    font-weight: 700;
}

.share-btn-native:hover {
    filter: brightness(1.1);
}

/* ===== 8. 読了プログレスバー ===== */

.reading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 10000;
    background: transparent;
    pointer-events: none;
}

.reading-progress-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--color-primary-400, #f7ff0b), var(--color-accent-400, #ff6b35));
    transition: width 0.1s linear;
    border-radius: 0 2px 2px 0;
}

/* ===== 9. チャプターシークボタン ===== */

.chapter-seek {
    background: none;
    border: 1px solid var(--color-border-light, #e2e8f0);
    border-radius: 6px;
    padding: 0.2em 0.6em;
    font-family: 'Inter', monospace;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-primary-400, #f7ff0b);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.chapter-seek:hover {
    background: var(--color-primary-400, #f7ff0b);
    color: var(--color-text-primary, #1a202c);
    border-color: var(--color-primary-400, #f7ff0b);
    transform: translateY(-1px);
}

.chapter-seek.active {
    background: var(--color-accent-400, #ff6b35);
    color: #fff;
    border-color: var(--color-accent-400, #ff6b35);
}