:root {
    --brand-primary: #00BCD4;
    --brand-ink: #22303A;
    --brand-surface: #FFFFFF;
    --brand-overlay: linear-gradient(135deg, rgba(0,188,212,.08), rgba(255,107,107,.08));
    --brand-accent: #FF6B6B;
}

.sponsor-detail-page { color: var(--brand-ink); }
.sponsor-detail-section { background: var(--brand-surface); border-radius: 20px; padding: 2rem; }

.sd-hero { display: grid; grid-template-columns: 1.2fr 1fr; gap: 2rem; align-items: center; position: relative; overflow: hidden; border-radius: 20px; background: var(--brand-overlay); padding: 2rem; }
.sd-hero .sd-logo { height: 56px; object-fit: contain; }
.sd-hero .sd-copy { font-weight: 800; font-size: clamp(22px, 3.2vw, 36px); letter-spacing: -0.5px; margin: .5rem 0 0; }
.sd-hero .sd-sub { color: #50616D; margin-top: .5rem; }
.sd-hero .sd-visual { border-radius: 16px; overflow: hidden; box-shadow: 0 8px 24px rgba(0,0,0,.08); }
.sd-hero .sd-visual img { width: 100%; height: auto; display: block; }

.sd-strengths { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 2rem; }
.sd-strength { background: #fff; border: 1px solid #ECEFF1; border-radius: 16px; padding: 1.2rem; }
.sd-strength h3 { font-size: 16px; margin: 0 0 .5rem; }
.sd-strength p { margin: 0; color: #607D8B; font-size: 14px; }

.sd-highlights { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 2rem; }
.sd-kpi { background: #fff; border-radius: 16px; border: 1px solid #ECEFF1; padding: 1.6rem; text-align: center; box-shadow: inset 0 0 0 1px rgba(0,0,0,.015); }
.sd-kpi .num { font-size: clamp(28px, 4vw, 42px); font-weight: 800; }
.sd-kpi .unit { font-size: 12px; color: #78909C; }

.sd-support { display: grid; grid-template-columns: 1.2fr 1fr; gap: 1rem; margin-top: 2rem; }
.sd-chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.sd-chip { padding: .4rem .8rem; border-radius: 999px; background: #EEF7FA; color: #215A67; font-size: 12px; border: 1px solid #D1ECF1; }
.sd-box { background: #fff; border: 1px solid #ECEFF1; border-radius: 16px; padding: 1.2rem; }
.sd-box .btn { display: inline-block; margin-right: .5rem; margin-top: .5rem; padding: .7rem 1.2rem; border-radius: 12px; text-decoration: none; font-weight: 700; }
.btn-primary { background: var(--brand-primary); color: #fff; }
.btn-ghost { background: #fff; border: 1px solid #CFD8DC; color: #37474F; }

.sd-logos { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1rem; align-items: center; opacity: .8; margin-top: 2rem; }
.sd-logos img { width: 100%; filter: grayscale(100%); opacity: .75; }

.sd-faq { margin-top: 2rem; }
.sd-faq details { background: #fff; border: 1px solid #ECEFF1; border-radius: 12px; padding: .8rem 1rem; }
.sd-faq details + details { margin-top: .6rem; }

.sd-related { margin-top: 2rem; }

.sd-cta { margin-top: 2rem; background: var(--brand-overlay); border-radius: 16px; padding: 1.4rem; display: flex; gap: .6rem; }

@media (max-width: 1199px) {
  .sd-hero { grid-template-columns: 1fr; }
  .sd-support { grid-template-columns: 1fr; }
  .sd-strengths, .sd-highlights { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
  .sd-strengths, .sd-highlights { grid-template-columns: 1fr; }
  .sd-logos { grid-template-columns: repeat(3, 1fr); }
}

/* ==========================================================================
   LIVE配信研究所 - スポンサー事務所詳細ページ専用CSS
   ========================================================================== */

/* ==========================================================================
   スポンサー詳細ヘッダーセクション
   ========================================================================== */

.sponsor-detail-header {
    padding: 4rem 0 3rem;
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.1) 0%, rgba(78, 205, 196, 0.1) 100%);
    margin-top: 2rem;
}

.sponsor-detail-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 3rem;
    align-items: start;
}

/* スポンサーロゴ */
.sponsor-detail-logo {
    background: #FFFFFF;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sponsor-detail-logo img {
    width: 100%;
    height: auto;
    max-width: 250px;
    object-fit: contain;
}

/* スポンサー情報 */
.sponsor-detail-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sponsor-detail-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: #2C3E50;
    margin: 0;
    line-height: 1.2;
}

.sponsor-detail-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #6C757D;
    background: #FFFFFF;
    padding: 1.5rem;
    border-radius: 15px;
    border-left: 4px solid #FF6B6B;
}

/* メタ情報 */
.sponsor-detail-meta {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    color: #2C3E50;
    background: #FFFFFF;
    padding: 0.8rem 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.meta-icon {
    font-size: 1.2rem;
}

/* アクションボタン */
.sponsor-detail-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.sponsor-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.sponsor-btn-primary {
    background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
    color: #FFFFFF;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.sponsor-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

.sponsor-btn-social {
    background: #FFFFFF;
    color: #2C3E50;
    border: 2px solid #E0E0E0;
}

.sponsor-btn-social:hover {
    background: #F8F9FA;
    border-color: #4ECDC4;
    transform: translateY(-2px);
}

/* ==========================================================================
   関連記事セクション
   ========================================================================== */

.sponsor-related-articles {
    padding: 4rem 0;
    background: #FFFFFF;
}

.sponsor-related-articles .section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: #2C3E50;
    margin-bottom: 3rem;
}

/* 記事グリッド */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

/* 記事が見つからない場合 */
.no-posts {
    text-align: center;
    padding: 4rem 2rem;
    color: #6C757D;
    font-size: 1.1rem;
}

/* ==========================================================================
   一般タグアーカイブページ
   ========================================================================== */

.general-tag-header {
    padding: 4rem 0 2rem;
    background: linear-gradient(135deg, rgba(255, 230, 109, 0.1) 0%, rgba(78, 205, 196, 0.1) 100%);
    text-align: center;
    margin-top: 2rem;
}

.general-tag-header .section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2C3E50;
    margin-bottom: 1rem;
}

.tag-description {
    font-size: 1.1rem;
    color: #6C757D;
    max-width: 800px;
    margin: 0 auto;
}

.general-tag-articles {
    padding: 4rem 0;
}

/* ==========================================================================
   ページネーション
   ========================================================================== */

.pagination {
    display: flex;
    justify-content: center;
    margin-top: 3rem;
}

.pagination ul {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 0.5rem;
}

.pagination li {
    margin: 0;
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0.5rem 1rem;
    background: #FFFFFF;
    border: 2px solid #E0E0E0;
    border-radius: 8px;
    color: #2C3E50;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.pagination a:hover {
    background: #FF6B6B;
    color: #FFFFFF;
    border-color: #FF6B6B;
    transform: translateY(-2px);
}

.pagination .current {
    background: linear-gradient(135deg, #FF6B6B 0%, #4ECDC4 100%);
    color: #FFFFFF;
    border-color: transparent;
}

/* ==========================================================================
   レスポンシブデザイン - タブレット
   ========================================================================== */

@media (max-width: 1024px) {
    .sponsor-detail-content {
        grid-template-columns: 250px 1fr;
        gap: 2rem;
    }
    
    .sponsor-detail-logo {
        padding: 1.5rem;
    }
    
    .sponsor-detail-title {
        font-size: 2rem;
    }
    
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==========================================================================
   レスポンシブデザイン - スマートフォン
   ========================================================================== */

@media (max-width: 768px) {
    .sponsor-detail-header {
        padding: 2rem 0;
    }
    
    .sponsor-detail-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .sponsor-detail-logo {
        max-width: 250px;
        margin: 0 auto;
    }
    
    .sponsor-detail-title {
        font-size: 1.8rem;
        text-align: center;
    }
    
    .sponsor-detail-description {
        font-size: 1rem;
        padding: 1rem;
    }
    
    .sponsor-detail-meta {
        justify-content: center;
        gap: 1rem;
    }
    
    .meta-item {
        font-size: 0.9rem;
        padding: 0.6rem 1rem;
    }
    
    .sponsor-detail-actions {
        justify-content: center;
    }
    
    .sponsor-btn {
        padding: 0.8rem 1.5rem;
        font-size: 0.95rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .sponsor-related-articles .section-title,
    .general-tag-header .section-title {
        font-size: 1.5rem;
    }
    
    .pagination a,
    .pagination span {
        min-width: 35px;
        height: 35px;
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }
}

/* ==========================================================================
   アクセシビリティ
   ========================================================================== */

.sponsor-btn:focus,
.pagination a:focus {
    outline: 3px solid #FF6B6B;
    outline-offset: 3px;
}

/* アニメーション無効化 */
@media (prefers-reduced-motion: reduce) {
    .sponsor-btn,
    .pagination a,
    .article-card-new {
        transition: none;
    }
}