/**
 * 全局"返回首页"胶囊按钮样式
 * 用法：<a href="index.html" class="vivi-back-home">← 返回首页</a>
 * 文字内容不动（保留原"← 返回首页"或"&larr; 返回首页"），样式由 class 接管。
 */
.vivi-back-home {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 7px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(102, 126, 234, 0.25);
    color: #667eea;
    font-size: 14px;
    font-weight: 500;
    line-height: 1;
    text-decoration: none;
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.12);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease,
        transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.vivi-back-home:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-color: transparent;
    color: #fff;
    transform: translateX(-3px);
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.35);
}

.vivi-back-home:active {
    transform: translateX(-3px) scale(0.97);
}

.vivi-back-home:visited {
    color: #667eea;
}

.vivi-back-home:hover:visited {
    color: #fff;
}