/* プレミアムモダンCSSデザイン */
:root {
    --bg-primary: #0a0a0c;
    --bg-secondary: #141418;
    --bg-glass: rgba(255, 255, 255, 0.03);
    --border-glass: rgba(255, 255, 255, 0.08);
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --accent: #ff2d55;
    --accent-glow: rgba(255, 45, 85, 0.4);
    --accent-blue: #007aff;
    --accent-blue-glow: rgba(0, 122, 255, 0.4);
    --font-family: 'Outfit', 'Inter', 'Noto Sans JP', sans-serif;
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
    padding-bottom: 60px;
    overflow-x: hidden;
}

/* ヘッダー・ナビゲーション */
header {
    background: rgba(10, 10, 12, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 30px var(--accent-glow);
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    margin-left: 20px;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--accent);
}

/* 固定広告（上部リンク） */
.fixed-ads-container {
    max-width: 1400px;
    margin: 25px auto 10px auto;
    padding: 0 20px;
}

.fixed-ads-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    list-style: none;
}

.fixed-ads-list li a {
    display: block;
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 14px 20px;
    text-align: center;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.fixed-ads-list li a::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 50%; height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.05) 50%, rgba(255,255,255,0) 100%);
    transform: skewX(-25deg);
    transition: 0.75s;
}

.fixed-ads-list li a:hover::before {
    left: 150%;
}

.fixed-ads-list li a:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px var(--accent-glow);
}

/* コンテンツレイアウト */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Masonryグリッド */
.video-grid {
    column-count: 5;
    column-gap: 20px;
    width: 100%;
}

@media (max-width: 1200px) {
    .video-grid { column-count: 4; }
}
@media (max-width: 900px) {
    .video-grid { column-count: 3; }
}
@media (max-width: 600px) {
    .video-grid { column-count: 2; }
}
@media (max-width: 400px) {
    .video-grid { column-count: 1; }
}

.grid-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 20px;
    break-inside: avoid;
    transition: var(--transition);
    position: relative;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
}

.grid-item:hover {
    transform: scale(1.03) translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8), 0 0 25px rgba(255, 255, 255, 0.05);
}

/* サムネイル画像 */
.thumb-wrapper {
    position: relative;
    width: 100%;
    overflow: hidden;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.thumb-wrapper img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.grid-item:hover .thumb-wrapper img {
    transform: scale(1.08);
}

.play-icon {
    position: absolute;
    width: 50px;
    height: 50px;
    background: rgba(10, 10, 12, 0.7);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    opacity: 0.8;
    transition: var(--transition);
}

.play-icon::after {
    content: '';
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 8px 0 8px 14px;
    border-color: transparent transparent transparent #fff;
    margin-left: 4px;
}

.grid-item:hover .play-icon {
    opacity: 1;
    transform: scale(1.1);
    background: var(--accent);
    border-color: transparent;
    box-shadow: 0 0 20px var(--accent-glow);
}

/* 情報 */
.item-info {
    padding: 15px;
}

.item-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.item-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    color: var(--text-secondary);
}

.item-link-btn {
    text-decoration: none;
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 2;
}

/* 広告カード */
.ad-item {
    background: rgba(255, 45, 85, 0.02);
    border: 1px solid rgba(255, 45, 85, 0.15);
    box-shadow: 0 10px 30px rgba(255, 45, 85, 0.05);
}
.ad-item:hover {
    border-color: var(--accent);
    box-shadow: 0 20px 40px var(--accent-glow);
}

.ad-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--accent);
    color: #fff;
    font-size: 10px;
    font-weight: 800;
    padding: 3px 8px;
    border-radius: 4px;
    letter-spacing: 0.5px;
    z-index: 3;
}

/* 個別詳細ページ */
.detail-layout {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
}

.video-container {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
}

.diary-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.diary-title {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 20px;
    border-left: 4px solid var(--accent);
    padding-left: 15px;
}

.diary-content {
    font-size: 15px;
    line-height: 1.8;
    color: #e5e5ea;
    white-space: pre-line;
}

.ad-section {
    margin-top: 40px;
    text-align: center;
}

.ad-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 20px;
    display: inline-block;
    max-width: 100%;
    transition: var(--transition);
}

.ad-card a {
    text-decoration: none;
    color: var(--text-primary);
}

.ad-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* 相互リンクセクション */
.mutual-links-section {
    margin-top: 60px;
    margin-bottom: 20px;
    padding: 30px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

.mutual-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.mutual-link-item {
    display: block;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    white-space: normal;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.mutual-link-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 45, 85, 0.2);
}

footer {
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-size: 12px;
}