/* 分析导航沿用全站色板，动效只作用于本菜单。 */
.navbar-tech .analysis-nav {
    --analysis-menu-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

.navbar-tech .analysis-nav-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    font: inherit;
    transition: color 180ms ease, background-color 180ms ease;
}

.navbar-tech .analysis-nav-toggle::after { display: none; }

.navbar-tech .analysis-nav-toggle[aria-expanded="true"] {
    color: var(--accent-primary) !important;
}

.analysis-nav-chevron {
    font-size: 0.65em;
    transition: transform 240ms var(--analysis-menu-ease);
}

.analysis-nav-toggle[aria-expanded="true"] .analysis-nav-chevron { transform: rotate(180deg); }

.navbar-tech .analysis-nav-menu {
    display: grid;
    width: max-content;
    min-width: 232px;
    max-width: calc(100vw - 24px);
    left: -6px;
    margin: 10px 0 0;
    padding: 0;
    border: 0;
    border-radius: 14px;
    background: transparent;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-7px) scale(0.98);
    transform-origin: 28px top;
    transition: opacity 160ms ease, transform 220ms var(--analysis-menu-ease), visibility 220ms;
}

.navbar-tech .analysis-nav-menu.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.analysis-nav-clip { min-height: 0; overflow: hidden; border-radius: inherit; }

.analysis-nav-list {
    margin: 0;
    padding: 7px;
    list-style: none;
    border: 1px solid var(--border-color);
    border-radius: inherit;
    background: var(--bg-secondary);
}

.analysis-nav-list > li + li { margin-top: 3px; }

.navbar-tech .analysis-nav-item {
    display: flex;
    align-items: center;
    gap: 11px;
    min-height: 48px;
    padding: 8px 10px;
    border-left: 2px solid transparent;
    border-radius: 9px;
    background: transparent;
    color: var(--text-secondary);
    transition: background-color 180ms ease, color 180ms ease;
}

.analysis-nav-icon {
    display: inline-flex;
    flex: 0 0 24px;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 32px;
    color: inherit;
    font-size: 1rem;
    transition: transform 220ms var(--analysis-menu-ease);
}

.analysis-nav-label { flex: 1; }

.analysis-nav-arrow {
    font-size: 1.2rem;
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity 160ms ease, transform 220ms var(--analysis-menu-ease);
}

.navbar-tech .analysis-nav-item:hover,
.navbar-tech .analysis-nav-item:focus-visible {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
}

.navbar-tech .analysis-nav-item.active {
    background: var(--bg-elevated);
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
    font-weight: 500;
}

.analysis-nav-item:hover .analysis-nav-icon { transform: translateY(-1px); }

.analysis-nav-item.active .analysis-nav-arrow,
.analysis-nav-item:hover .analysis-nav-arrow,
.analysis-nav-item:focus-visible .analysis-nav-arrow { opacity: 1; transform: translateX(0); }

.navbar-tech .analysis-nav-toggle:focus-visible,
.navbar-tech .analysis-nav-item:focus-visible { outline: 2px solid var(--accent-primary); outline-offset: -2px; }

/* 填补按钮与浮层之间的空隙，鼠标移入菜单时保持展开。 */
@media (min-width: 992px) {
    .analysis-nav-menu::before {
        content: '';
        position: absolute;
        top: -12px;
        left: 0;
        right: 0;
        height: 12px;
    }
}

/* 手机菜单在导航内部平滑展开，不覆盖后面的入口。 */
@media (max-width: 991.98px) {
    #navbarNav .analysis-nav-toggle { width: 100%; justify-content: space-between; }
    #navbarNav .analysis-nav-menu {
        position: static;
        width: auto;
        min-width: 0;
        margin: 0 12px;
        grid-template-rows: 0fr;
        box-shadow: none;
        transform: none;
        transition: grid-template-rows 220ms var(--analysis-menu-ease), opacity 160ms ease, visibility 220ms;
    }
    #navbarNav .analysis-nav-menu.show { grid-template-rows: 1fr; }
    #navbarNav .analysis-nav-list { margin: 4px 0 8px; }
    #navbarNav .analysis-nav-item { min-height: 48px; padding: 8px 10px; }
}

@media (prefers-reduced-motion: reduce) {
    .navbar-tech .analysis-nav *,
    #navbarNav .analysis-nav-menu { transition: none; }
    .navbar-tech .analysis-nav-menu,
    .analysis-nav-item:hover .analysis-nav-icon { transform: none; }
}