/* 全站左上角：返回上一级 + 主页 */
.lg-site-nav {
    position: fixed;
    top: max(10px, env(safe-area-inset-top, 0px));
    left: max(10px, env(safe-area-inset-left, 0px));
    z-index: 9998;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-family: "Noto Serif SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.lg-site-nav .lg-nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 0 14px;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: #5b4d56;
    text-decoration: none;
    border: 1px solid rgba(200, 180, 195, 0.55);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 14px rgba(120, 100, 120, 0.12);
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s, background 0.2s, transform 0.15s;
    -webkit-tap-highlight-color: transparent;
}

.lg-site-nav .lg-nav-btn:hover {
    color: #3d3540;
    border-color: rgba(200, 140, 170, 0.55);
    background: rgba(255, 250, 252, 0.95);
}

.lg-site-nav .lg-nav-btn:active {
    transform: scale(0.98);
}

button.lg-nav-btn {
    font-family: inherit;
    margin: 0;
    appearance: none;
    -webkit-appearance: none;
}

.lg-site-nav .lg-nav-home {
    color: #6b5a6e;
    background: rgba(255, 248, 252, 0.88);
}