/* Custom Styles & Japanese Modern Animations */
body {
    background-color: #0d1b2a;
    color: #fcfaf2;
    font-family: 'Shippori Mincho', serif;
    overflow-x: hidden;
    /* Washi Texture */
    background-image: 
        radial-gradient(circle at 50% 50%, rgba(20, 30, 50, 0.4) 0%, rgba(13, 27, 42, 1) 100%),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='[http://www.w3.org/2000/svg'%3E%3Cfilter](http://www.w3.org/2000/svg'%3E%3Cfilter) id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.05'/%3E%3C/svg%3E");
}

/* 縦書きクラス */
.tategaki {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.2em;
}

/* スクロールバー */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: #0d1b2a;
}
::-webkit-scrollbar-thumb {
    background: #c5a059;
    border-radius: 0px;
}

/* フェードイン */
.fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1.5s cubic-bezier(0.16, 1, 0.3, 1), transform 1.5s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}
.fade-in-section.is-visible {
    opacity: 1;
    transform: none;
}

/* ヒーローエリアの演出 */
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(rgba(13, 27, 42, 0.3), rgba(13, 27, 42, 0.6)),
        url('[https://yumenova.com/wp-content/uploads/2025/05/YumeNova新.webp](https://yumenova.com/wp-content/uploads/2025/05/YumeNova新.webp)');
    background-size: cover;
    background-position: center;
    z-index: -1;
    animation: kenburns 30s infinite alternate;
}
@keyframes kenburns {
    0% { transform: scale(1.0); }
    100% { transform: scale(1.1); }
}

/* 和風の枠線装飾 */
.border-wa {
    position: relative;
}
.border-wa::before, .border-wa::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-color: #c5a059;
    border-style: solid;
    transition: all 0.5s ease;
}
.border-wa::before { top: 0; left: 0; border-width: 1px 0 0 1px; }
.border-wa::after { bottom: 0; right: 0; border-width: 0 1px 1px 0; }

.border-wa:hover::before, .border-wa:hover::after {
    width: 100%;
    height: 100%;
}

/* ニュースリストのホバー */
.news-item {
    transition: all 0.4s ease;
    border-left: 1px solid transparent;
}
.news-item:hover {
    background: linear-gradient(90deg, rgba(197, 160, 89, 0.1) 0%, transparent 100%);
    border-left: 3px solid #c5a059;
    padding-left: 1rem;
}

/* 選択色 */
::selection {
    background: #c5a059;
    color: #0d1b2a;
}