/**
 * Categories & Filters - モダン・ブルータリズム
 * カテゴリ分けとフィルター機能のスタイル
 */

/* アプリヘッダー */
.apps-header,
.knowledge-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 2rem;
}

/* カテゴリフィルター */
.category-filters {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.8rem 1.8rem;
    background: transparent;
    color: var(--color-text);
    border: 2px solid rgba(255, 255, 255, 0.2);
    font-family: var(--font-display);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--color-neon-green);
    transition: left 0.3s;
    z-index: -1;
}

.filter-btn:hover::before {
    left: 0;
}

.filter-btn:hover {
    color: var(--color-bg);
    border-color: var(--color-neon-green);
}

.filter-btn.active {
    background: var(--color-neon-green);
    border-color: var(--color-neon-green);
    color: var(--color-bg);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.4);
}

/* アプリアイテム（サムネイル対応） */
.app-item,
.knowledge-card {
    display: block;
    background: rgba(255, 255, 255, 0.03);
    border: 3px solid rgba(255, 255, 255, 0.08);
    text-decoration: none;
    color: var(--color-text);
    transition: all 0.3s;
    overflow: hidden;
    position: relative;
}

.knowledge-card {
    max-width: 1100px;
    margin: 0 auto;
}

.app-item:hover {
    border-color: var(--color-neon-green);
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 255, 136, 0.2);
}

/* サムネイル */
.app-thumbnail {
    position: relative;
    width: 100%;
    aspect-ratio: 5 / 2;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.5);
}

.app-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.app-item:hover .app-thumbnail img {
    transform: scale(1.05);
}

/* サムネイルオーバーレイ */
.app-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.7) 100%);
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 1.5rem;
}

.app-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--color-neon-green);
    color: var(--color-bg);
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* カテゴリ別のタグカラー */
.app-item[data-category="tools"] .app-tag {
    background: var(--color-neon-green);
}

.app-item[data-category="creative"] .app-tag {
    background: var(--color-neon-pink);
}

.app-item[data-category="data"] .app-tag {
    background: var(--color-neon-blue);
}

.app-item[data-category="learning"] .app-tag {
    background: #FFD700;
}

.app-item[data-category="record"] .app-tag {
    background: #FF6B00;
}

.app-item[data-category="knowledge"] .app-tag {
    background: #4DA3FF;
}

/* アプリコンテンツ */
.app-content,
.knowledge-content {
    padding: 1rem;
    position: relative;
}

.knowledge-content {
    padding-left: 2rem;
    padding-right: 2rem;
}

.app-number {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.1);
    position: absolute;
    top: 0.8rem;
    right: 1.2rem;
    line-height: 1;
}

.app-content h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 0.6rem;
    color: var(--color-text);
}

.app-excerpt,
.knowledge-excerpt {
    color: #AAAAAA;
    line-height: 1.6;
    margin-bottom: 0.7rem;
    font-size: 0.88rem;
}

.app-arrow {
    font-size: 1.6rem;
    color: var(--color-neon-green);
    transition: transform 0.3s;
}

.app-item:hover .app-arrow {
    transform: translateX(10px);
}

/* フィルター時のアニメーション */
.app-item.hidden {
    display: none;
}

.app-item.show {
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* レスポンシブ */
@media (max-width: 968px) {
    .apps-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .category-filters {
        width: 100%;
        justify-content: flex-start;
    }

    .filter-btn {
        flex: 1;
        min-width: 80px;
        text-align: center;
    }

    .app-number {
        font-size: 2rem;
    }

    .app-content h3 {
        font-size: 1.5rem;
    }
}

@media (max-width: 640px) {
    .category-filters {
        flex-direction: column;
    }

    .filter-btn {
        width: 100%;
    }

    .app-thumbnail {
        aspect-ratio: 16 / 9;
    }
}