/* 导航栏 — 更轻盈 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.80);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.5);
    z-index: 100;
    padding: 0.75rem 0;
    transition: var(--transition);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    height: 52px;
    width: auto;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: clamp(1.2rem, 2.5vw, 2.2rem);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.4rem 0;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.menu-toggle {
    display: none;
    font-size: 2rem;
    line-height: 1;
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
}