/* サイバー・eスポーツ風のベース設定 */
body {
    background-color: #f1f5f9;
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* 斜めカットのデザイン */
.clip-gaming { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 0); }
.clip-gaming-btn { clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px); }

/* --- 記事コンテンツ用 カスタムCSS --- */
/* コンテナ */
.main-container { max-width: 56rem; margin: 0 auto; padding: 1.5rem 1rem; }
@media (min-width: 640px) { .main-container { padding: 2rem 1rem; } }
@media (min-width: 768px) { .main-container { padding: 3rem 1rem; } }

/* ヒーローヘッダー */
.hero-header { background-color: white; padding: 1.25rem; margin-bottom: 2rem; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); border-top: 4px solid #00e5ff; position: relative; overflow: hidden; }
@media (min-width: 640px) { .hero-header { padding: 1.5rem; margin-bottom: 3rem; } }
@media (min-width: 768px) { .hero-header { padding: 2.5rem; } }
.hero-header .bg-glow { position: absolute; right: -2.5rem; top: -2.5rem; width: 8rem; height: 8rem; background-color: #f3f4f6; border-radius: 50%; opacity: 0.5; filter: blur(24px); }
.hero-header .system-badge { background-color: #0f172a; color: #00e5ff; font-family: 'Orbitron', sans-serif; font-weight: bold; padding: 0.25rem 0.75rem; font-size: 0.625rem; letter-spacing: 0.1em; display: inline-block; margin-bottom: 0.75rem; }
@media (min-width: 640px) { .hero-header .system-badge { font-size: 0.75rem; margin-bottom: 1rem; } }
@media (min-width: 768px) { .hero-header .system-badge { font-size: 0.875rem; } }
.hero-header h1 { font-size: 1.25rem; font-weight: 900; line-height: 1.375; color: #111827; letter-spacing: -0.025em; overflow-wrap: break-word; margin: 0; }
@media (min-width: 640px) { .hero-header h1 { font-size: 1.875rem; } }
@media (min-width: 768px) { .hero-header h1 { font-size: 2.25rem; line-height: 1.25; } }
.hero-header h1 .sub { color: transparent; background-clip: text; -webkit-background-clip: text; background-image: linear-gradient(to right, #2563eb, #00e5ff); }

/* セクション共通 */
.article-body section { margin-bottom: 3rem; }
@media (min-width: 640px) { .article-body section { margin-bottom: 4rem; } }

/* 見出し (H2) */
.article-body h2 { font-size: 1.25rem; font-weight: 900; margin-bottom: 1.25rem; display: flex; align-items: flex-start; gap: 0.5rem; overflow-wrap: break-word; line-height: 1.4; color: #111827; margin-top: 0; }
@media (min-width: 640px) { .article-body h2 { font-size: 1.5rem; margin-bottom: 1.5rem; align-items: center; gap: 0.75rem; } }
@media (min-width: 768px) { .article-body h2 { font-size: 1.875rem; } }
.article-body h2 .num { color: #00e5ff; font-family: 'Orbitron', sans-serif; margin-top: 0.25rem; flex-shrink: 0; }
@media (min-width: 640px) { .article-body h2 .num { margin-top: 0; } }
.article-body h2.alert .num { color: #ef4444; }

/* 段落 (P) */
.article-body p { font-size: 0.875rem; margin-bottom: 1rem; line-height: 1.8; color: #334155; overflow-wrap: break-word; margin-top: 0; }
@media (min-width: 640px) { .article-body p { font-size: 1rem; } }
.article-body p:last-child { margin-bottom: 0; }

/* 導入ボックス */
.intro-box { background-color: rgba(255,255,255,0.6); padding: 1.25rem; border-radius: 0.75rem; border: 1px solid #e5e7eb; margin-bottom: 2.5rem; }
@media (min-width: 640px) { .intro-box { padding: 1.5rem; margin-bottom: 3.5rem; } }

/* コンテンツエリア (インデント用) */
.content-area { padding-left: 0; }
@media (min-width: 768px) { .content-area { padding-left: 2.5rem; } }

/* 関連記事リンク */
.related-link { display: block; background-color: #111827; color: #ffffff; padding: 1rem; margin-top: 1.25rem; position: relative; overflow: hidden; transition: background-color 0.3s; text-decoration: none; }
@media (min-width: 640px) { .related-link { margin-top: 1.5rem; } }
.related-link:hover { background-color: #1f2937; }
.related-link::before { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(0,229,255,0.2), transparent); transform: translateX(-100%); transition: transform 0.5s; }
.related-link:hover::before { transform: translateX(100%); }
.related-link .badge { color: #00e5ff; font-family: 'Orbitron', sans-serif; font-size: 0.625rem; font-weight: bold; letter-spacing: 0.1em; margin-bottom: 0.25rem; position: relative; z-index: 10; display: block; }
@media (min-width: 640px) { .related-link .badge { font-size: 0.75rem; margin-bottom: 0.5rem; } }
.related-link .title { font-weight: bold; font-size: 0.875rem; position: relative; z-index: 10; margin: 0; color: white; transition: color 0.3s; overflow-wrap: break-word; }
@media (min-width: 640px) { .related-link .title { font-size: 1rem; } }
.related-link:hover .title { color: #00e5ff; }

/* アコーディオン (ドロワー) */
.accordion-list { display: flex; flex-direction: column; gap: 0.75rem; }
@media (min-width: 640px) { .accordion-list { gap: 1rem; } }
.accordion-item { background-color: #ffffff; border: 1px solid #e5e7eb; border-radius: 0.5rem; box-shadow: 0 1px 2px 0 rgba(0,0,0,0.05); overflow: hidden; margin: 0; }
.accordion-item.alert { border-left: 4px solid #ef4444; border-radius: 0 0.5rem 0.5rem 0; border-top: none; border-right: none; border-bottom: none; }
.accordion-summary { display: flex; justify-content: space-between; align-items: flex-start; cursor: pointer; padding: 1rem; transition: background-color 0.3s; position: relative; }
@media (min-width: 640px) { .accordion-summary { align-items: center; } }
@media (min-width: 768px) { .accordion-summary { padding: 1.25rem; } }
.accordion-summary:hover { background-color: #f9fafb; }
.accordion-summary h3 { font-weight: bold; font-size: 1rem; margin: 0; display: flex; align-items: flex-start; gap: 0.75rem; padding-right: 1rem; color: #1f2937; overflow-wrap: break-word; line-height: 1.4; }
@media (min-width: 640px) { .accordion-summary h3 { font-size: 1.125rem; align-items: center; } }
.accordion-summary.recommend h3 { color: #1d4ed8; padding-right: 1rem; flex-direction: column; align-items: flex-start; gap: 0.5rem; }
@media (min-width: 640px) { .accordion-summary.recommend h3 { flex-direction: row; align-items: center; gap: 0.75rem; } }
.accordion-summary .num-icon { width: 1.5rem; height: 1.5rem; border-radius: 0.25rem; background-color: #dbeafe; color: #2563eb; display: flex; justify-content: center; align-items: center; font-family: 'Orbitron', sans-serif; font-weight: bold; flex-shrink: 0; font-size: 0.875rem; margin-top: 0.125rem; }
@media (min-width: 640px) { .accordion-summary .num-icon { width: 2rem; height: 2rem; font-size: 1rem; margin-top: 0; } }
.accordion-summary .svg-icon { width: 1.25rem; height: 1.25rem; color: #6b7280; flex-shrink: 0; margin-top: 0.125rem; }
@media (min-width: 640px) { .accordion-summary .svg-icon { width: 1.5rem; height: 1.5rem; margin-top: 0; } }
.accordion-summary .plus-icon { font-size: 1.25rem; color: #9ca3af; flex-shrink: 0; margin-top: 0.125rem; transition: transform 0.3s; }
@media (min-width: 640px) { .accordion-summary .plus-icon { font-size: 1.5rem; margin-top: 0; } }
details[open] .accordion-summary .plus-icon { transform: rotate(45deg); }
.accordion-summary .recommend-badge { display: inline-block; background-color: #facc15; font-size: 0.625rem; font-weight: bold; padding: 0.25rem 0.5rem; border-radius: 0.25rem; color: #000; font-family: 'Orbitron', sans-serif; line-height: 1; }
@media (min-width: 640px) { .accordion-summary .recommend-badge { font-size: 0.75rem; } }
.accordion-body { padding: 0 1rem 1rem 1rem; }
@media (min-width: 768px) { .accordion-body { padding: 0 1.25rem 1.25rem 1.25rem; } }
.accordion-item.standard .accordion-body { border-top: 1px solid #f3f4f6; background-color: rgba(249,250,251,0.5); padding-top: 1rem; }
@media (min-width: 768px) { .accordion-item.standard .accordion-body { padding-top: 1.25rem; } }
.accordion-item.alert .accordion-body { background-color: rgba(254,242,242,0.3); }
.accordion-item.clean .accordion-body { border-top: 1px solid #f3f4f6; padding-top: 1rem; }
@media (min-width: 768px) { .accordion-item.clean .accordion-body { padding-top: 1.25rem; } }

details > summary { list-style: none; }
details > summary::-webkit-details-marker { display: none; }
details[open] summary ~ * { animation: fadeIn 0.3s ease-in-out; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: translateY(0); } }

/* アコーディオン内のリンクボックス */
.small-related { margin-top: 1rem; padding: 0.75rem; background-color: #111827; border-radius: 0.25rem; }
@media (min-width: 640px) { .small-related { padding: 1rem; } }
.small-related span { color: #00e5ff; font-family: 'Orbitron', sans-serif; font-size: 0.625rem; font-weight: bold; display: block; margin-bottom: 0.25rem; }
@media (min-width: 640px) { .small-related span { font-size: 0.75rem; } }
.small-related a { color: white; font-weight: bold; font-size: 0.875rem; text-decoration: none; display: block; overflow-wrap: break-word; transition: color 0.3s; }
.small-related a:hover { color: #00e5ff; }

/* カードリスト (目的別) */
.card-grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
@media (min-width: 640px) { .card-grid { gap: 1.5rem; } }
@media (min-width: 768px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }
.card-item { background-color: #0f172a; padding: 1.5rem; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); border-top: 2px solid; position: relative; overflow: hidden; }
.card-item.kids { border-color: #00e5ff; }
.card-item.beginner { border-color: #ffeb3b; }
.card-item.advanced { border-color: #a855f7; }
.card-item::before { content: ''; position: absolute; inset: 0; pointer-events: none; }
.card-item.kids::before { background: linear-gradient(to bottom right, rgba(0,229,255,0.1), transparent); }
.card-item.beginner::before { background: linear-gradient(to bottom right, rgba(255,235,59,0.1), transparent); }
.card-item.advanced::before { background: linear-gradient(to bottom right, rgba(168,85,247,0.1), transparent); }
.card-item .target { font-family: 'Orbitron', sans-serif; font-weight: bold; font-size: 0.625rem; margin-bottom: 0.75rem; letter-spacing: 0.1em; display: flex; align-items: center; gap: 0.5rem; }
@media (min-width: 640px) { .card-item .target { font-size: 0.75rem; } }
.card-item.kids .target { color: #00e5ff; }
.card-item.beginner .target { color: #ffeb3b; }
.card-item.advanced .target { color: #c084fc; }
.card-item .target span { width: 0.375rem; height: 0.375rem; display: inline-block; }
.card-item.kids .target span { background-color: #00e5ff; }
.card-item.beginner .target span { background-color: #ffeb3b; }
.card-item.advanced .target span { background-color: #a855f7; }
.card-item h3 { font-weight: bold; font-size: 1rem; margin-top: 0; margin-bottom: 0.75rem; color: white; overflow-wrap: break-word; }
@media (min-width: 640px) { .card-item h3 { font-size: 1.125rem; } }
.card-item p { font-size: 0.75rem; color: #d1d5db; margin: 0; position: relative; z-index: 10; line-height: 1.6; overflow-wrap: break-word; }
@media (min-width: 640px) { .card-item p { font-size: 0.875rem; } }

/* CTAセクション (eスピ！) */
.cta-section { background-color: #0f172a; color: white; padding: 1.5rem; position: relative; z-index: 10; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); overflow: hidden; margin-bottom: 3rem; }
@media (min-width: 640px) { .cta-section { padding: 2rem; margin-bottom: 4rem; } }
@media (min-width: 768px) { .cta-section { padding: 3rem; } }
.cta-section .bg-blur-blue { position: absolute; top: 0; right: 0; width: 12rem; height: 12rem; background-color: #2563eb; border-radius: 50%; filter: blur(80px); opacity: 0.3; z-index: -1; }
.cta-section .bg-blur-purple { position: absolute; bottom: 0; left: 0; width: 12rem; height: 12rem; background-color: #9333ea; border-radius: 50%; filter: blur(80px); opacity: 0.3; z-index: -1; }
@media (min-width: 640px) { .cta-section .bg-blur-blue, .cta-section .bg-blur-purple { width: 16rem; height: 16rem; filter: blur(100px); } }

.cta-header { text-align: center; margin-bottom: 1.5rem; }
@media (min-width: 640px) { .cta-header { margin-bottom: 2rem; } }
.cta-header .badge { color: #00e5ff; font-family: 'Orbitron', sans-serif; font-weight: bold; letter-spacing: 0.1em; font-size: 0.75rem; margin-bottom: 0.5rem; display: block; }
@media (min-width: 640px) { .cta-header .badge { font-size: 0.875rem; } }
.cta-header h2 { display: block; text-align: center; font-size: 1.25rem; font-weight: 900; margin-bottom: 0.75rem; line-height: 1.375; overflow-wrap: break-word; color: white; margin-top:0; }
@media (min-width: 640px) { .cta-header h2 { font-size: 1.875rem; margin-bottom: 1rem; } }
@media (min-width: 768px) { .cta-header h2 { font-size: 2.25rem; } }
.cta-header p { color: #d1d5db; max-width: 42rem; margin: 0 auto; font-size: 0.875rem; overflow-wrap: break-word; }
@media (min-width: 640px) { .cta-header p { font-size: 1rem; } }

.cta-features { background-color: rgba(255,255,255,0.1); backdrop-filter: blur(4px); border: 1px solid rgba(255,255,255,0.2); padding: 1.25rem; border-radius: 0.75rem; max-width: 48rem; margin: 0 auto 1.5rem auto; }
@media (min-width: 640px) { .cta-features { padding: 1.5rem; margin-bottom: 2rem; } }
@media (min-width: 768px) { .cta-features { padding: 2rem; } }
.cta-features h3 { font-weight: bold; font-size: 1rem; margin-top: 0; margin-bottom: 0.75rem; text-align: center; color: #ffeb3b; border-bottom: 1px solid rgba(255,255,255,0.2); padding-bottom: 0.75rem; overflow-wrap: break-word; }
@media (min-width: 640px) { .cta-features h3 { font-size: 1.25rem; margin-bottom: 1rem; padding-bottom: 1rem; } }
.cta-features ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.75rem; }
@media (min-width: 640px) { .cta-features ul { gap: 1rem; } }
.cta-features li { display: flex; align-items: flex-start; gap: 0.5rem; font-weight: bold; color: #f3f4f6; font-size: 0.75rem; overflow-wrap: break-word; }
@media (min-width: 640px) { .cta-features li { gap: 0.75rem; font-size: 0.875rem; } }
@media (min-width: 768px) { .cta-features li { font-size: 1rem; } }
.cta-features li .check { color: #00e5ff; margin-top: 0.125rem; flex-shrink: 0; }
@media (min-width: 640px) { .cta-features li .check { margin-top: 0.25rem; } }

.cta-footer { text-align: center; }
.cta-footer .catch { font-weight: bold; font-size: 0.875rem; margin-bottom: 1.25rem; color: white; background-color: rgba(220,38,38,0.8); display: inline-block; padding: 0.5rem 0.75rem; overflow-wrap: break-word; line-height: 1.625; }
@media (min-width: 640px) { .cta-footer .catch { font-size: 1rem; padding: 0.5rem 1rem; margin-bottom: 1.5rem; } }
@media (min-width: 768px) { .cta-footer .catch { font-size: 1.125rem; } }

.cta-button { display: inline-block; background-color: #ffeb3b; color: #111827; font-weight: 900; font-size: 1rem; padding: 1rem 1.5rem; width: 100%; transition: box-shadow 0.3s, transform 0.3s; overflow-wrap: break-word; text-decoration: none; text-align: center; }
@media (min-width: 640px) { .cta-button { font-size: 1.25rem; padding: 1.25rem 2.5rem; width: auto; } }
@media (min-width: 768px) { .cta-button { font-size: 1.5rem; } }
.cta-button:hover { box-shadow: 0 0 15px rgba(0, 229, 255, 0.6); transform: translateY(-2px); }

.cta-footer .review-link { margin-top: 1.25rem; font-size: 0.75rem; display: flex; align-items: flex-start; justify-content: flex-start; gap: 0.25rem; text-align: left; color: #9ca3af; text-decoration: none; transition: color 0.3s; overflow-wrap: break-word; }
@media (min-width: 640px) { .cta-footer .review-link { margin-top: 1.5rem; font-size: 0.875rem; align-items: center; justify-content: center; text-align: center; } }
.cta-footer .review-link:hover { color: white; }
.cta-footer .review-link svg { width: 1rem; height: 1rem; margin-top: 0.125rem; flex-shrink: 0; }
@media (min-width: 640px) { .cta-footer .review-link svg { margin-top: 0; } }

/* まとめボックス */
.summary-box { background-color: white; border-top: 4px solid #0f172a; padding: 1.25rem; border-radius: 0 0 0.75rem 0.75rem; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1); margin-bottom: 0 !important; }
@media (min-width: 640px) { .summary-box { padding: 1.5rem; } }
@media (min-width: 768px) { .summary-box { padding: 2rem; } }
.summary-box h2 { display: block; font-weight: 900; font-size: 1.25rem; margin-bottom: 0.75rem; text-align: center; overflow-wrap: break-word; margin-top: 0; color: #111827; }
@media (min-width: 640px) { .summary-box h2 { font-size: 1.5rem; margin-bottom: 1rem; } }

/* ユーティリティ・インラインブロック管理 */
.d-ib { display: inline-block; }
.hide-sm { display: none; }
@media (min-width: 640px) { .hide-sm { display: block; } .show-sm-only { display: none; } }
@media (min-width: 768px) { .hide-md { display: inline; } }