/* ============================================================
   2-layout / mobile-nav.css
   移动端底部导航 + More菜单 + FAB + 论坛页头
   来源：website-complete / styles.css L743–867
   ============================================================ */

/* ===== Mobile Nav ===== */
.mobile-nav {
    display: none;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    height: 54px;
    background: var(--bg-sidebar);
    border-top: 1px solid var(--border-light);
    z-index: 100;
    width: 100%;
}

.mobile-nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-evenly;
    height: 100%;
    padding: 0 8px;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box;
}

.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 6px 12px;
    color: var(--text-tertiary);
    font-size: 10px;
    border: none;
    background: none;
    cursor: pointer;
    flex: 0 0 auto;
    min-width: 0;
    border-radius: 8px;
    transition: var(--transition);
    -webkit-tap-highlight-color: transparent;
}

.mobile-nav-item:active,
.mobile-nav-item:hover {
    background: var(--bg-hover);
}

.mobile-nav-item svg { width: 20px; height: 20px; }
.mobile-nav-item.active { color: var(--text-primary); background: var(--bg-hover); }

/* Mobile More Menu */
.mobile-nav-more { position: relative; flex: 0 0 auto; min-width: 0; display: flex; justify-content: center; }

.mobile-more-menu {
    position: absolute;
    bottom: calc(100% + 12px);
    right: 0;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: var(--transition);
    z-index: 200;
}

.mobile-nav-more:focus-within .mobile-more-menu,
.mobile-nav-more.active .mobile-more-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mobile-more-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.mobile-more-item:active { background: var(--bg-hover); color: var(--text-primary); }
.mobile-more-item svg { width: 18px; height: 18px; opacity: 0.7; }

/* Mobile FAB - Forum Floating Action Button */
.mobile-fab {
    display: none;
    position: fixed;
    right: 16px;
    bottom: 76px;
    width: 44px;
    height: 44px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    box-shadow: var(--shadow-md);
    z-index: 99;
    cursor: pointer;
    transition: var(--transition);
}

.mobile-fab svg { width: 20px; height: 20px; }
.mobile-fab:active { transform: scale(0.95); background: var(--bg-hover); }

/* Forum Header */
.forum-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.forum-page-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}