/* モダンフッタースタイル - 2025バージョン */
.app-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: #ffffff;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
    z-index: 999;
    padding: 0;
    margin: 0;
    border-top: 2px solid #67f2e2;
}

.footer-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
    padding: 0;
}

.nav-button {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 0;
    color: #1a2a36;
    text-decoration: none;
    font-size: 0.7rem;
    font-weight: 500;
    position: relative;
    transition: all 0.2s ease;
    background: none;
    border: none;
    text-align: center;
    min-width: 0;
    overflow: hidden;
    white-space: nowrap;
}

.nav-button:before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background-color: #67f2e2;
    transform: translateX(-50%);
    transition: width 0.2s ease;
}

.nav-button.active {
    color: #67f2e2;
    font-weight: 700;
}

.nav-button.active:before {
    width: 100%;
}

.copyright {
    font-size: 0.65rem;
    padding: 4px 0;
    margin: 0;
    text-align: center;
    color: #999;
    background-color: #f8f8f8;
}

/* フッターに余白を確保するためのページ下部スペース */
body {
    padding-bottom: 70px;
}

/* ナビゲーションアイコンの追加 */
.nav-button:after {
    content: '';
    display: block;
    width: 24px;
    height: 24px;
    margin-bottom: 2px;
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
    opacity: 0.7;
}

.nav-button[href="index.html"]:after {
    content: '🏠';
    font-size: 16px;
}

.nav-button[href="stamp.html"]:after {
    content: '📆';
    font-size: 16px;
}

.nav-button[href="gacha.html"]:after {
    content: '🎰';
    font-size: 16px;
}

.nav-button[href="mypage.html"]:after {
    content: '📊';
    font-size: 16px;
}

.nav-button[href="ranking.html"]:after {
    content: '🏆';
    font-size: 16px;
}

.nav-button.active:after {
    opacity: 1;
}