/* ========== フッター - 最高峰デザイン ========== */
.site-footer {
    background-color: #000;
    color: #fff;
    font-family: 'Noto Sans JP', sans-serif;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

/* 背景のグラデーションアニメーション */
.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.02) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(255,255,255,0.02) 0%, transparent 50%);
    animation: footerGradient 20s ease-in-out infinite;
    pointer-events: none;
}

@keyframes footerGradient {
    0%, 100% { transform: scale(1) rotate(0deg); opacity: 0.5; }
    50% { transform: scale(1.1) rotate(5deg); opacity: 1; }
}

/* サイト共通のコンテナ */
.site-footer .container {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 40px;
    box-sizing: border-box;
    position: relative;
    z-index: 1;
}

/* フッター上部 */
.footer-top {
    padding-bottom: 60px;
    position: relative;
}

/* アニメーションボーダー */
.footer-top::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent,
        rgba(255,255,255,0.3) 20%,
        rgba(255,255,255,0.5) 50%,
        rgba(255,255,255,0.3) 80%,
        transparent
    );
    animation: borderGlow 3s ease-in-out infinite;
}

@keyframes borderGlow {
    0%, 100% { opacity: 0.3; transform: scaleX(0.8); }
    50% { opacity: 1; transform: scaleX(1); }
}

/* ナビゲーション */
.footer-nav {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px 100px;
}

/* ナビゲーションアイテム */
.nav-item {
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
}

.nav-item:nth-child(1) { animation-delay: 0.1s; }
.nav-item:nth-child(2) { animation-delay: 0.2s; }
.nav-item:nth-child(3) { animation-delay: 0.3s; }
.nav-item:nth-child(4) { animation-delay: 0.4s; }
.nav-item:nth-child(5) { animation-delay: 0.5s; }
.nav-item:nth-child(7) { animation-delay: 0.6s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
    from {
        opacity: 0;
        transform: translateY(20px);
    }
}

.nav-item a {
    text-decoration: none;
    color: #fff;
    display: inline-flex;
    align-items: baseline;
    gap: 16px;
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 8px 0;
}

/* ホバーエフェクト - アンダーライン */
.nav-item a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #fff, rgba(255,255,255,0.5));
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-item a:hover::before {
    width: 100%;
}

/* ホバーエフェクト - グロー */
.nav-item a::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.nav-item a:hover::after {
    opacity: 1;
}

.nav-item a:hover {
    transform: translateX(8px);
}

.nav-item a:hover .main-text {
    text-shadow: 0 0 20px rgba(255,255,255,0.5);
}

.nav-item .main-text {
    font-family: 'Arial Black', 'Impact', sans-serif;
    font-size: 26px;
    font-weight: 900;
    letter-spacing: 0.02em;
    transition: all 0.3s;
}

.nav-item .sub-text {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.3s;
}

.nav-item a:hover .sub-text {
    color: rgba(255, 255, 255, 1);
}

/* フッター下部 */
.footer-bottom {
    padding-top: 60px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    opacity: 0;
    animation: fadeIn 1s ease-out 0.8s forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

/* ロゴアニメーション */
.footer-logo {
    position: relative;
}

.footer-logo svg {
    max-width: 300px;
    height: auto;
    filter: drop-shadow(0 0 30px rgba(255,255,255,0.1));
    transition: filter 0.5s;
}

.footer-logo:hover svg {
    filter: drop-shadow(0 0 40px rgba(255,255,255,0.3));
}

/* SVGパスアニメーション */
.footer-logo svg path {
    fill: white;
    transition: all 0.3s;
}

.footer-logo:hover svg path {
    animation: pathGlow 1.5s ease-in-out infinite;
}

@keyframes pathGlow {
    0%, 100% { 
        fill: white;
        filter: brightness(1);
    }
    50% { 
        fill: white;
        filter: brightness(1.2) drop-shadow(0 0 10px rgba(255,255,255,0.8));
    }
}

/* メタ情報 */
.footer-meta {
    text-align: right;
}

.footer-copyright {
    color: #ACACAC;
    font-size: 12px;
    margin: 0 0 16px 0;
    letter-spacing: 0.05em;
    opacity: 0;
    animation: fadeInRight 0.8s ease-out 1s forwards;
}

@keyframes fadeInRight {
    to {
        opacity: 1;
        transform: translateX(0);
    }
    from {
        opacity: 0;
        transform: translateX(20px);
    }
}

.footer-privacy a {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    font-weight: 700;
    font-family: 'Arial Black', 'Impact', sans-serif;
    letter-spacing: 0.05em;
    position: relative;
    display: inline-block;
    transition: all 0.3s;
    opacity: 0;
    animation: fadeInRight 0.8s ease-out 1.2s forwards;
}

/* プライバシーポリシーホバーエフェクト */
.footer-privacy a::before {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #fff, transparent);
    transform: scaleX(0);
    transition: transform 0.3s;
}

.footer-privacy a:hover::before {
    transform: scaleX(1);
}

.footer-privacy a:hover {
    text-shadow: 0 0 15px rgba(255,255,255,0.6);
    transform: translateY(-2px);
}

/* パーティクルエフェクト（オプション） */
.footer-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    animation: float 20s infinite linear;
}

@keyframes float {
    from {
        transform: translateY(100vh) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    to {
        transform: translateY(-10vh) translateX(100px);
        opacity: 0;
    }
}

/* スクロールトリガーアニメーション */
.site-footer.in-view .nav-item {
    animation-play-state: running;
}

/* ========== レスポンシブデザイン ========== */
@media (max-width: 1024px) {
    .footer-nav {
        gap: 25px 60px;
    }
}

@media (max-width: 768px) {
    .site-footer {
        padding: 60px 0;
    }
    
    .site-footer .container {
        padding: 0 20px;
    }
    
    .footer-nav {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .nav-item a {
        padding: 12px 0;
    }
    
    .nav-item .main-text {
        font-size: 22px;
    }
    
    .footer-bottom {
        flex-direction: column;
        align-items: center;
        gap: 40px;
        text-align: center;
    }
    
    .footer-logo {
        order: -1;
    }
    
    .footer-logo svg {
        max-width: 250px;
    }
    
    .footer-meta {
        text-align: center;
    }
    
    /* モバイルでのアニメーション調整 */
    .nav-item a:hover {
        transform: translateX(4px);
    }
}

@media (max-width: 480px) {
    .nav-item .main-text {
        font-size: 20px;
    }
    
    .nav-item .sub-text {
        font-size: 11px;
    }
    
    .footer-logo svg {
        max-width: 200px;
    }
}

/* ダークモード対応 */
@media (prefers-color-scheme: dark) {
    .site-footer {
        background-color: #000;
    }
}

/* アクセシビリティ：モーション軽減 */
@media (prefers-reduced-motion: reduce) {
    .site-footer::before,
    .footer-top::after,
    .nav-item,
    .footer-bottom,
    .footer-copyright,
    .footer-privacy a,
    .particle {
        animation: none !important;
    }
    
    .nav-item a,
    .footer-logo svg,
    .footer-privacy a {
        transition: opacity 0.3s !important;
    }
}