/* ==========================================================
   StockFlow · 站点框架
   顶部导航、语言切换、页脚、返回顶部、跳转链接
   ========================================================== */

/* ---------------- 顶部导航 _Menu ---------------- */
.stock-navbar {
    height: 72px;
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: box-shadow .3s ease, border-color .3s ease;
}

    .stock-navbar.scrolled {
        border-bottom-color: var(--stock-border);
        box-shadow: 0 6px 24px rgba(31, 41, 55, .06);
    }

.stock-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--stock-text) !important;
}

.stock-brand-icon {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    color: #fff;
    font-size: 1.1rem;
    background: linear-gradient(135deg, var(--stock-primary), var(--stock-secondary));
    box-shadow: 0 6px 14px rgba(102, 126, 234, .35);
}

.stock-brand-badge {
    font-size: .65rem;
    font-weight: 600;
    color: var(--stock-primary);
    border: 1px solid rgba(102, 126, 234, .45);
    border-radius: 4px;
    padding: 1px 6px;
    margin-left: 2px;
}

.stock-navbar .nav-link {
    color: var(--stock-text);
    font-size: .95rem;
    font-weight: 500;
    margin: 0 6px;
    padding: 8px 12px !important;
    border-radius: 8px;
    position: relative;
    transition: color .2s ease;
}

    .stock-navbar .nav-link:hover {
        color: var(--stock-primary);
    }

    .stock-navbar .nav-link.active {
        color: var(--stock-primary);
        font-weight: 600;
    }

        .stock-navbar .nav-link.active::after {
            content: "";
            position: absolute;
            left: 12px;
            right: 12px;
            bottom: 2px;
            height: 3px;
            border-radius: 3px;
            background: linear-gradient(90deg, var(--stock-primary), var(--stock-secondary));
        }

.stock-navbar .navbar-toggler {
    border: none;
}

    .stock-navbar .navbar-toggler:focus {
        box-shadow: 0 0 0 3px rgba(102,126,234,.25);
    }

/* ---------------- 语言切换 ---------------- */
.language-switcher .dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    border: 0;
    background: transparent;
}

    .language-switcher .dropdown-toggle::after {
        margin-left: 2px;
    }

.language-switcher .dropdown-menu {
    min-width: 150px;
    border: 1px solid var(--stock-border);
    border-radius: 10px;
    padding: 6px;
    box-shadow: 0 14px 34px rgba(31, 41, 55, .12);
}

.language-switcher .dropdown-item {
    border-radius: 7px;
    padding: 8px 12px;
    font-size: .9rem;
}

    .language-switcher .dropdown-item.active,
    .language-switcher .dropdown-item:active {
        color: var(--stock-primary);
        background: rgba(102, 126, 234, .1);
        font-weight: 600;
    }

/* ---------------- 页脚 ---------------- */
.site-footer {
    background: #141a33;
    color: rgba(255, 255, 255, .72);
    padding: 64px 0 28px;
    margin-top: 90px;
    font-size: .92rem;
}

.footer-brand {
    color: #fff !important;
    font-size: 1.3rem;
}

    .footer-brand .brand-icon, .footer-brand .stock-brand-icon {
        margin-right: 6px;
    }

.footer-desc {
    margin-top: 16px;
    line-height: 1.9;
    max-width: 340px;
}

.site-footer h6 {
    color: #fff;
    font-weight: 700;
    margin-bottom: 16px;
}

.site-footer a {
    color: rgba(255, 255, 255, .72);
    text-decoration: none;
    display: block;
    margin-bottom: 10px;
    transition: color .2s;
}

    .site-footer a:hover {
        color: var(--stock-primary-light);
    }

.footer-contact {
    margin-bottom: 10px;
}

    .footer-contact i {
        color: var(--stock-primary-light);
        margin-right: 8px;
    }

.site-footer hr {
    border-color: rgba(255, 255, 255, .12);
    margin: 36px 0 20px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    color: rgba(255,255,255,.45);
    font-size: .82rem;
}

.brand-icon {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 9px;
    color: #fff;
    background: linear-gradient(135deg, var(--stock-primary), var(--stock-secondary));
}

/* 外观像链接的页脚按钮（Cookie 设置） */
.footer-link-button {
    display: block;
    margin: 0 0 10px;
    padding: 0;
    border: 0;
    background: none;
    color: rgba(255, 255, 255, .72);
    font: inherit;
    text-align: left;
    cursor: pointer;
    transition: color .2s;
}

    .footer-link-button:hover,
    .footer-link-button:focus {
        color: var(--stock-primary-light);
    }

/* ---------------- 返回顶部 ---------------- */
.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 12px;
    color: #fff;
    background: linear-gradient(135deg, var(--stock-primary), var(--stock-secondary));
    box-shadow: 0 10px 24px rgba(102, 126, 234, .4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all .3s ease;
    z-index: 1050;
}

    .back-to-top.show {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

/* ---------------- Accessibility: skip link ---------------- */
.skip-link {
    position: absolute;
    left: 16px;
    top: -80px;
    z-index: 2000;
    padding: 12px 18px;
    border-radius: 0 0 12px 12px;
    background: #fff;
    color: var(--stock-text);
    font-weight: 600;
    text-decoration: none;
    box-shadow: var(--stock-shadow);
    transition: top .2s ease;
}

    .skip-link:focus {
        top: 0;
        outline: 3px solid rgba(102, 126, 234, .5);
        outline-offset: 2px;
    }

/* ---------------- 响应式 ---------------- */
@media (max-width: 991.98px) {
    .stock-navbar .navbar-collapse {
        background: #fff;
        border: 1px solid var(--stock-border);
        border-radius: 12px;
        padding: 12px;
        margin-top: 10px;
        box-shadow: var(--stock-shadow);
    }
}