/* 🔥 スクロール連動ヘッダー＆タブバー完全版CSS */

/* ========================================
   🖥️ PC版ヘッダー（デフォルト）
========================================= */
.header {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    width: 100% !important;
    z-index: 8000 !important;
    overflow: visible !important;
    contain: none !important;
    transform: translateY(0) translateZ(0) !important;
    will-change: transform, opacity !important;
    background: var(--gradient);
    backdrop-filter: blur(20px) !important;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1) !important;
    transition: transform 0.4s cubic-bezier(0.2, 0, 0.2, 1), 
                opacity 0.4s cubic-bezier(0.2, 0, 0.2, 1) !important;
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
}

/* 🔥 スクロール時の非表示状態 */
.header.scroll-hidden {
    transform: translateY(-100%) translateZ(0) !important;
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.6, 1), 
                opacity 0.6s cubic-bezier(0.4, 0, 0.6, 1),
                visibility 0s linear 0.6s !important;
}

.header-container {
    position: relative !important;
    overflow: visible !important;
    contain: none !important;
    transform: none !important;
    isolation: auto !important;
    max-width: 1680px;
    margin: 0 auto;
    padding: 0 1rem !important;
    height: 60px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
}

.header-container > * {
    min-width: 0 !important;
}

body {
    padding-top: 80px !important;
    overflow-x: visible !important;
    background: var(--background-color) !important;
}

.dark-mode {
    --background-color: rgb(30, 30, 43) !important;
}

.dark-mode .header {
    background: linear-gradient(135deg, 
        rgba(30, 30, 43, 0.95) 0%, 
        rgba(44, 62, 80, 0.95) 100%) !important;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5) !important;
}

/* ========================================
   📱 モバイル対応（768px以下）
========================================= */
@media (max-width: 768px) {
    /* 🔥 基本レイアウト */
    body {
        padding-top: 60px !important;
        padding-bottom: 90px !important;
        -webkit-overflow-scrolling: touch !important;
        overflow-scrolling: touch !important;
    }

    /* 🔥 ヘッダー修正 */
    .header {
        height: 60px !important;
        padding: 0 !important;
    }

    .header-container {
        padding: 0 0.75rem !important;
        height: 60px !important;
        gap: 0.5rem !important;
    }

    .logo {
        font-size: 1.4rem !important;
        flex-shrink: 0 !important;
    }

    /* 🔥 PC版要素を非表示 */
    .header-center {
        display: none !important;
    }

    .nav-menu {
        display: none !important;
    }

    /* 🔥 モバイルボタン表示 */
    .mobile-search-toggle,
    .mobile-menu-toggle {
        display: flex !important;
        align-items: center;
        justify-content: center;
        width: 44px !important;
        height: 44px !important;
        min-width: 44px !important;
        border: none;
        background: rgba(255, 255, 255, 0.15);
        color: white;
        border-radius: 10px;
        font-size: 1.3rem !important;
        cursor: pointer;
        flex-shrink: 0 !important;
    }

    .mode-toggle {
        width: 44px !important;
        height: 44px !important;
        font-size: 1.3rem !important;
        flex-shrink: 0 !important;
    }

    .header-right {
        display: flex !important;
        gap: 0.5rem !important;
        flex-shrink: 0 !important;
    }

    /* 🔥 下部タブバー表示 */
    .native-tab-bar {
        position: fixed !important;
        bottom: 0 !important;
        left: 0 !important;
        right: 0 !important;
        z-index: 9000 !important;
        display: flex !important;
        justify-content: space-around !important;
        align-items: center !important;
        background: rgba(255, 255, 255, 0.98) !important;
        backdrop-filter: blur(20px) saturate(180%) !important;
        border-top: 1px solid rgba(0, 0, 0, 0.1) !important;
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1) !important;
        height: 70px !important;
        padding-bottom: env(safe-area-inset-bottom, 0) !important;
        transform: translateY(0) translateZ(0) !important;
        opacity: 1 !important;
        visibility: visible !important;
        pointer-events: auto !important;
        transition: transform 0.4s cubic-bezier(0.2, 0, 0.2, 1), 
                    opacity 0.4s cubic-bezier(0.2, 0, 0.2, 1) !important;
        will-change: transform, opacity !important;
        backface-visibility: hidden !important;
        transform-style: preserve-3d !important;
    }

    /* 🔥 スクロール時のタブバー非表示 */
    .native-tab-bar.scroll-hidden {
        transform: translateY(100%) translateZ(0) !important;
        opacity: 0 !important;
        visibility: hidden !important;
        pointer-events: none !important;
        transition: transform 0.6s cubic-bezier(0.4, 0, 0.6, 1), 
                    opacity 0.6s cubic-bezier(0.4, 0, 0.6, 1),
                    visibility 0s linear 0.6s !important;
    }

    .dark-mode .native-tab-bar {
        background: rgba(40, 40, 40, 0.98) !important;
        border-top: 1px solid rgba(255, 255, 255, 0.1) !important;
        color: white !important;
    }

    .tab-item {
        display: flex !important;
        flex-direction: column !important;
        align-items: center !important;
        justify-content: center !important;
        padding: 0.5rem !important;
        color: #8e8e93 !important;
        text-decoration: none !important;
        min-width: 60px !important;
        cursor: pointer;
        border-radius: 8px !important;
        transition: all 0.2s cubic-bezier(0.2, 0, 0.2, 1) !important;
        -webkit-tap-highlight-color: transparent !important;
    }

    .tab-item.active {
        color: var(--primary-color) !important;
        background: rgba(66, 134, 198, 0.1) !important;
    }

    .tab-icon {
        font-size: 1.5rem !important;
        margin-bottom: 0.25rem !important;
        line-height: 1 !important;
        display: block !important;
    }

    .tab-label {
        font-size: 0.7rem !important;
        font-weight: 500 !important;
        line-height: 1.2 !important;
        display: block !important;
        white-space: nowrap !important;
        margin-top: 2px !important;
        color: inherit !important;
    }

    .dark-mode .tab-item {
        color: #999 !important;
    }

    .dark-mode .tab-item.active {
        color: var(--primary-color) !important;
    }

    /* 🔥 タグセクション */
    .tags-section {
        margin: 1rem !important;
        padding: 1rem !important;
        border-radius: 12px !important;
    }

    .tags-container-wrapper h3 {
        font-size: 1.2rem !important;
        margin-bottom: 1rem !important;
    }

    .tags-container {
        display: flex !important;
        flex-wrap: nowrap !important;
        overflow-x: auto !important;
        overflow-y: hidden !important;
        -webkit-overflow-scrolling: touch !important;
        scrollbar-width: none !important;
        gap: 0.5rem !important;
        padding-bottom: 0.5rem !important;
    }

    .tags-container::-webkit-scrollbar {
        display: none !important;
    }

    .tag {
        padding: 0.5rem 1rem !important;
        font-size: 0.875rem !important;
        flex-shrink: 0 !important;
        white-space: nowrap !important;
    }

    /* 🔥 動画グリッド */
    .videos-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 0.75rem !important;
        padding: 0 0.5rem !important;
    }

    .video-card {
        border-radius: 8px !important;
    }

    .video-info {
        padding: 0.75rem !important;
    }

    .video-title {
        font-size: 0.875rem !important;
        line-height: 1.4 !important;
        display: -webkit-box !important;
        -webkit-line-clamp: 2 !important;
        -webkit-box-orient: vertical !important;
        overflow: hidden !important;
    }

    /* 🔥 検索オプション */
    .search-options-section {
        margin: 1rem !important;
        padding: 1rem !important;
    }

    .search-options-container {
        flex-direction: column !important;
        gap: 1rem !important;
    }

    .search-option {
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 0.5rem !important;
    }

    .search-option select {
        width: 100% !important;
        padding: 0.75rem !important;
    }

    /* 🔥 フィルターボタン */
    .content-filters {
        display: grid !important;
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 0.75rem !important;
        margin: 1rem !important;
    }

    .filter-button {
        padding: 0.75rem !important;
        font-size: 0.875rem !important;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
    }

    /* 🔥 サイドバー非表示 */
    .sidebar {
        display: none !important;
    }

    .main-container {
        grid-template-columns: 1fr !important;
        padding: 0 !important;
    }

    /* 🔥 コンテンツヘッダー */
    .content-header {
        padding: 1.5rem !important;
        margin: 1rem !important;
        border-radius: 12px !important;
    }

    .content-header h1 {
        font-size: 1.5rem !important;
    }

    /* 🔥 ページネーション */
    .pagination {
        gap: 0.5rem !important;
        margin: 2rem 0 !important;
        padding: 0 1rem !important;
    }

    .pagination a,
    .pagination span {
        padding: 0.5rem 0.75rem !important;
        font-size: 0.875rem !important;
        min-width: 40px !important;
    }

    /* 🔥 カテゴリタブ */
    .category-tabs {
        display: flex !important;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch !important;
        scrollbar-width: none !important;
        gap: 0.5rem !important;
        padding: 0.5rem !important;
    }

    .category-tabs::-webkit-scrollbar {
        display: none !important;
    }

    .category-tab {
        padding: 0.5rem 1rem !important;
        font-size: 0.875rem !important;
        white-space: nowrap !important;
        flex-shrink: 0 !important;
    }
}

/* ========================================
   📱 小型スマホ（414px以下）
========================================= */
@media (max-width: 414px) {
    .header-container {
        padding: 0 0.5rem !important;
        gap: 0.4rem !important;
    }

    .logo {
        font-size: 1.3rem !important;
    }

    .mobile-search-toggle,
    .mobile-menu-toggle,
    .mode-toggle {
        width: 40px !important;
        height: 40px !important;
        font-size: 1.2rem !important;
    }

    .videos-grid {
        gap: 0.5rem !important;
    }

    .video-title {
        font-size: 0.8rem !important;
    }
}

/* ========================================
   📱 超小型スマホ（375px以下）
========================================= */
@media (max-width: 375px) {
    .logo {
        font-size: 1.2rem !important;
    }

    .mobile-search-toggle,
    .mobile-menu-toggle,
    .mode-toggle {
        width: 38px !important;
        height: 38px !important;
        font-size: 1.1rem !important;
    }

    .header-right {
        gap: 0.3rem !important;
    }

    .videos-grid {
        gap: 0.4rem !important;
    }

    .tag {
        font-size: 0.8rem !important;
        padding: 0.4rem 0.8rem !important;
    }
}

/* ========================================
   🎨 言語切り替え
========================================= */
.language-switcher {
    position: relative;
    z-index: 9999;
}

.language-button,
.language-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-button:hover,
.language-toggle:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.language-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: rgba(0, 0, 0, 0.95);
    border-radius: 12px;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    min-width: 160px;
    z-index: 10000;
}

.language-menu.show,
.language-menu.active {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    pointer-events: auto !important;
}

.language-item,
.language-option {
    padding: 0.75rem 1rem;
    color: white;
    cursor: pointer;
    transition: background 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.language-item:hover,
.language-option:hover {
    background: rgba(255, 255, 255, 0.1);
}

.language-item.current,
.language-option.current {
    background: rgba(66, 134, 198, 0.3);
}

@media (max-width: 768px) {
    .language-button,
    .language-toggle {
        padding: 0.4rem 0.8rem;
        font-size: 0.875rem;
    }

    .language-menu {
        right: 0;
        min-width: 140px;
    }
}

/* ========================================
   🎨 ダークモード追加スタイル
========================================= */
.dark-mode .language-menu {
    background: rgba(20, 20, 20, 0.95);
}

.dark-mode .video-title {
    color: var(--text-primary);
}

/* ========================================
   ⚡ パフォーマンス最適化
========================================= */
.header,
.native-tab-bar {
    will-change: transform, opacity;
    backface-visibility: hidden;
    transform: translateZ(0);
}

.video-card,
.tag {
    will-change: transform;
}