:root {
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-main: #212529;
    --text-sub: #6c757d;
    --primary: #0d6efd;
    --primary-hover: #0b5ed7;
    --border-radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--card-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1.5rem 0;
    margin-bottom: 2rem;
    text-align: center;
}

.logo {
    margin: 0;
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(45deg, #0d6efd, #0dcaf0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    margin: 0.5rem 0 0;
    color: var(--text-sub);
}

/* Filters */
.filter-bar {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.filter-btn {
    background: transparent;
    border: 2px solid #e9ecef;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-sub);
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.card-media {
    position: relative;
    aspect-ratio: 16/9;
    background: #000;
    overflow: hidden;
}

.card-media img,
.card-media video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.card:hover .card-media img,
.card:hover .card-media video {
    transform: scale(1.05);
}

.media-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
    backdrop-filter: blur(4px);
}

.card-body {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    margin: 0;
    font-size: 1rem;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

.btn-view {
    display: inline-block;
    padding: 0.5rem 1rem;
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.btn-view:hover {
    background-color: var(--primary);
    color: white;
}

/* Detail Page */
.logo-link {
    text-decoration: none;
}

.breadcrumb {
    margin-bottom: 2rem;
    color: var(--text-sub);
}

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

.item-detail {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.item-preview {
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.item-preview img,
.item-preview video {
    max-width: 100%;
    max-height: 600px;
    width: auto;
    height: auto;
}

.item-info {
    display: flex;
    flex-direction: column;
}

.item-title {
    margin: 0 0 1rem;
    font-size: 2rem;
    line-height: 1.2;
}

.item-meta {
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
    align-items: center;
}

.badge {
    background: #e9ecef;
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 0.8rem;
    color: var(--text-sub);
}

.item-description {
    margin-bottom: 2rem;
    color: var(--text-sub);
}

.btn-large {
    display: flex;
    justify-content: center;
    width: 100%;
    padding: 1rem;
    font-size: 1.2rem;
    margin-top: auto;
    background-color: var(--primary);
    color: white;
    border-radius: 8px;
    text-decoration: none;
    transition: var(--transition);
    align-items: center;
    gap: 10px;
}

.btn-large:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

@media (max-width: 768px) {
    .item-detail {
        grid-template-columns: 1fr;
    }
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-sub);
    border-top: 1px solid #e9ecef;
}

@media (max-width: 600px) {
    .grid {
        grid-template-columns: 1fr;
    }
}