/* ===== components/navigation.css ===== */
/* 页面导航栏、主类别导航、年级子菜单 */

/* 页面导航栏 */
.page-nav {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
}
.nav-btn {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 8px 20px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 30px;
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}
.nav-btn:hover {
    background: var(--accent-dim);
    color: var(--accent);
    transform: translateY(-1px);
}
.nav-btn:active {
    transform: translateY(0);
}

/* 主类别导航 */
.extra-categories {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin: 24px 0 16px;
    flex-wrap: wrap;
}
.extra-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
    padding: 8px 28px;
    border-radius: 40px;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}
.extra-btn:hover {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}
.extra-btn.active {
    background: var(--accent);
    color: #0b0c0e;
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(201, 169, 89, 0.3);
}

/* 年级子菜单 */
.grade-submenu {
    margin: 8px 0 32px;
    text-align: center;
    transition: opacity 0.2s, transform 0.2s;
    opacity: 1;
    transform: translateY(0);
}
.grade-submenu.hidden {
    display: none;
}
.grade-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}
.grade-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
    padding: 6px 20px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}
.grade-btn:hover {
    background: var(--accent-dim);
    color: var(--accent);
    border-color: var(--accent);
}
.grade-btn.active {
    background: var(--accent);
    color: #0b0c0e;
    border-color: var(--accent);
    box-shadow: 0 2px 8px rgba(201, 169, 89, 0.25);
}

@media (max-width: 600px) {
    .page-nav {
        flex-wrap: wrap;
        gap: 8px;
    }
    .nav-btn {
        padding: 6px 14px;
        font-size: 0.9rem;
    }
}