:root {
    /*--primary: #111;
    --secondary: #767676;
    --light-gray: #f5f5f5;
    --white: #ffffff;
    --accent-color: #000;*/

    --safe-padding: 5%;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px var(--safe-padding);
    border-bottom: 1px solid #eee;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 2000;
}

.logo {
    font-weight: 900;
    font-size: 1.5rem;
    text-decoration: none;
    color: var(--primary);
    letter-spacing: -1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}
/*.nav-menu a {*/
/*    text-decoration: none;*/
/*    color: var(--secondary);*/
/*    font-size: 0.9rem;*/
/*    font-weight: 500;*/
/*}*/
.nav-menu a {
    text-decoration: none;
    color: var(--secondary);
    font-size: 0.95rem; /* 微调字体大小 */
    font-weight: 600; /* 优化：提升字体权重 */
    position: relative;
    padding: 8px 0;
    transition: color 0.3s ease; /* 优化：更丝滑的过渡 */
}
.nav-menu a:hover {
    color: var(--primary);
}
.nav-menu a.active {
    color: var(--primary);
}
.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-color);
    border-radius: 2px;
}
.menu-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; }

@media (max-width: 850px) {
    .nav-menu {
        display: none; position: absolute; top: 55px; left: 0; right: 0;
        background: white; flex-direction: column; padding: 20px; border-bottom: 1px solid #eee;
    }
    .nav-menu.active { display: flex; }
    .menu-toggle { display: block; }
    /*.
    collection-grid { grid-template-columns: 1fr; }
    .topic-img-grid { grid-template-columns: repeat(2, 1fr); }
    .masonry-grid { column-count: 1; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; gap: 10px; }
    */
}