/* カスタムCSS */
:root {
    --primary-color: #ff6b35;
    --secondary-color: #f7931e;
    --accent-color: #004e89;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --bg-light: #f8f9fa;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Meiryo', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
}

/* ヒーローセクション */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    background-size: 50px 50px;
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0px); }
    100% { transform: translateY(-100px); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
    display: flex;
    flex-direction: column;
}

.stat-item strong {
    font-size: 2.5rem;
    font-weight: 700;
    display: block;
}

.stat-item small {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* セクションタイトル */
.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--accent-color);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* フィルターセクション */
.filter-section {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

/* アルバムグリッド */
.album-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.album-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.album-card:hover {
    transform: translateY(-8px);
}

.album-card .card {
    border: none;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: box-shadow 0.3s ease;
}

.album-card:hover .card {
    box-shadow: var(--shadow-hover);
}

.card-img-wrapper {
    position: relative;
    overflow: hidden;
    height: 200px;
}

.card-img-top {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.album-card:hover .card-img-top {
    transform: scale(1.05);
}

.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.album-card:hover .card-overlay {
    opacity: 1;
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.card-date {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.card-date i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

/* ソーシャルリンク */
.social-links {
    display: flex;
    gap: 0.5rem;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-light);
    color: var(--text-light);
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.social-link:hover {
    color: white;
    transform: translateY(-2px);
}

.social-link:nth-child(1):hover {
    background: #4285f4;
    border-color: #4285f4;
}

.social-link:nth-child(2):hover {
    background: #1877f2;
    border-color: #1877f2;
}

.social-link:nth-child(3):hover {
    background: #ff6600;
    border-color: #ff6600;
}

/* ボタンスタイル */
.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 25px;
    padding: 0.5rem 1.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
}

/* フッター */
.footer {
    background: var(--accent-color);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer h5 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.footer a {
    color: var(--secondary-color);
    text-decoration: none;
}

.footer a:hover {
    color: white;
    text-decoration: underline;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .album-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 60px 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .filter-section {
        padding: 1rem;
    }
    
    .filter-section .row > div {
        margin-bottom: 1rem;
    }
}

/* アニメーション */
.album-card {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
    transform: translateY(30px);
}

.album-card:nth-child(1) { animation-delay: 0.1s; }
.album-card:nth-child(2) { animation-delay: 0.2s; }
.album-card:nth-child(3) { animation-delay: 0.3s; }
.album-card:nth-child(4) { animation-delay: 0.4s; }
.album-card:nth-child(5) { animation-delay: 0.5s; }
.album-card:nth-child(6) { animation-delay: 0.6s; }
.album-card:nth-child(7) { animation-delay: 0.7s; }
.album-card:nth-child(8) { animation-delay: 0.8s; }
.album-card:nth-child(9) { animation-delay: 0.9s; }
.album-card:nth-child(10) { animation-delay: 1.0s; }

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