/* 扁平化导航栏样式 */
.top-bar-flat {
    background: var(--dark-color);
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

.top-bar-flat .top-bar-info span {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.top-bar-flat .social-icon {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.top-bar-flat .social-icon:hover {
    color: var(--primary-light);
    transform: translateY(-1px);
}

.navbar-flat {
    padding: 1rem 0;
    transition: var(--transition);
    background: white !important;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--medium-gray);
}

.navbar-flat-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--dark-color) !important;
    text-decoration: none;
}

.navbar-flat-brand img {
    height: 50px;
    object-fit: contain;
    width: 58px;
}

.navbar-flat-brand .brand-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 扁平化导航链接 */
.nav-link-flat {
    color: var(--dark-gray) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    margin: 0 0.25rem;
}

.nav-link-flat:hover {
    color: var(--primary-color) !important;
    background: rgba(255, 107, 53, 0.05);
}

.nav-link-flat.active {
    color: var(--primary-color) !important;
    font-weight: 600;
    background: rgba(255, 107, 53, 0.1);
}

/* 语言选择器扁平化 */
.language-selector-flat .dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--dark-gray);
    background: white;
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    transition: var(--transition);
}

.language-selector-flat .dropdown-toggle:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.language-selector-flat .dropdown-menu {
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
}

.language-selector-flat .dropdown-item {
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.language-selector-flat .dropdown-item:hover {
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary-color);
}

/* 语言选择器样式增强 */
.language-selector-flat .dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--dark-gray);
    background: white;
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    transition: var(--transition);
}

.language-selector-flat .dropdown-toggle:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(255, 107, 53, 0.05);
}

/* 下拉菜单样式 */
.language-selector-flat .dropdown-menu {
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
    min-width: 200px;
    border: 1px solid var(--medium-gray);
}

.language-selector-flat .dropdown-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    text-decoration: none;
    color: var(--dark-color);
    margin-bottom: 0.25rem;
}

.language-selector-flat .dropdown-item:last-child {
    margin-bottom: 0;
}

.language-selector-flat .dropdown-item:hover {
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary-color);
}

.language-selector-flat .dropdown-item.active {
    background: rgba(255, 107, 53, 0.15);
    color: var(--primary-color);
    font-weight: 500;
}

/* 国旗图标样式 */
.language-selector-flat .fi {
    width: 20px;
    height: 15px;
    border-radius: 2px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* 默认语言徽章 */
.language-selector-flat .badge.bg-primary {
    background: var(--primary-color) !important;
    font-size: 0.6rem;
    padding: 0.2rem 0.4rem;
}

/* 语言切换按钮中的图标 */
.language-selector-flat .dropdown-toggle .bi-globe {
    color: var(--primary-color);
}

/* 移动端优化 */
@media (max-width: 1199.98px) {
    .language-selector-flat {
        margin-top: 1rem;
        margin-left: 0;
        width: 100%;
    }

    .language-selector-flat .dropdown-toggle {
        width: 100%;
        justify-content: center;
        padding: 0.75rem;
    }

    .language-selector-flat .dropdown-menu {
        width: 100%;
        min-width: unset;
    }
}

/* Premium advisory navigation */
.navbar-flat {
    min-height: 76px;
    background: rgba(255, 255, 255, .96) !important;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.navbar-flat-brand {
    flex-shrink: 0;
    line-height: 1.05;
}

.brand-lockup {
    display: inline-flex;
    flex-direction: column;
    gap: .18rem;
}

.brand-lockup .brand-text {
    line-height: 1;
    letter-spacing: -.02em;
}

.brand-subline {
    color: #718096;
    font-size: .55rem;
    font-weight: 700;
    letter-spacing: .13em;
    line-height: 1;
    text-transform: uppercase;
    white-space: nowrap;
}

.navbar-flat .navbar-nav {
    gap: .12rem;
}

.navbar-flat .nav-link-flat {
    align-items: center;
    border-radius: 999px;
    display: inline-flex;
    font-size: .9rem;
    letter-spacing: .005em;
    padding: .66rem .82rem !important;
    white-space: nowrap;
}

.navbar-flat .nav-link-flat.dropdown-toggle::after {
    border: 0;
    content: '\F282';
    font-family: bootstrap-icons;
    font-size: .68rem;
    margin-left: .45rem;
    vertical-align: 0;
}

.navbar-flat .dropdown-menu.nav-mega-menu {
    border: 1px solid rgba(6, 26, 58, .1);
    border-radius: 14px;
    box-shadow: 0 18px 44px rgba(6, 26, 58, .16);
    min-width: 292px;
    padding: .7rem;
    top: calc(100% + .65rem);
}

.navbar-flat .dropdown-heading {
    color: #8793a3;
    font-size: .65rem;
    font-weight: 800;
    letter-spacing: .12em;
    padding: .3rem .75rem .55rem;
    text-transform: uppercase;
}

.navbar-flat .nav-featured-link {
    align-items: flex-start;
    border-radius: 10px;
    display: flex;
    gap: .7rem;
    padding: .7rem .75rem;
    white-space: normal;
}

.navbar-flat .nav-featured-link:hover,
.navbar-flat .dropdown-item:hover {
    background: rgba(242, 140, 24, .09);
    color: var(--navy);
}

.navbar-flat .nav-featured-link strong,
.navbar-flat .nav-featured-link small {
    display: block;
}

.navbar-flat .nav-featured-link strong {
    color: var(--navy);
    font-size: .88rem;
    line-height: 1.2;
}

.navbar-flat .nav-featured-link small {
    color: #718096;
    font-size: .75rem;
    line-height: 1.35;
    margin-top: .24rem;
}

.nav-item-icon {
    align-items: center;
    background: rgba(242, 140, 24, .12);
    border-radius: 9px;
    color: var(--primary-dark);
    display: inline-flex;
    flex: 0 0 34px;
    height: 34px;
    justify-content: center;
    width: 34px;
}

.navbar-flat .dropdown-menu:not(.nav-mega-menu) .dropdown-item {
    border-radius: 8px;
    font-size: .85rem;
    padding: .62rem .75rem;
}

.navbar-flat .dropdown-menu.nav-mega-menu .dropdown-item {
    align-items: center;
    display: flex;
    gap: .65rem;
    min-height: 2.45rem;
    padding: .62rem .75rem;
}

.navbar-flat .dropdown-menu.nav-mega-menu .dropdown-item span {
    line-height: 1.25;
}

.nav-menu-icon {
    color: #7b8798;
    flex: 0 0 1.1rem;
    font-size: .95rem;
    text-align: center;
    transition: color .2s ease;
}

.navbar-flat .dropdown-menu.nav-mega-menu .dropdown-item:hover .nav-menu-icon,
.navbar-flat .dropdown-menu.nav-mega-menu .dropdown-item:focus .nav-menu-icon {
    color: var(--primary-dark);
}

.navbar-actions {
    gap: .65rem;
    margin-left: 1rem;
}

.nav-contact-btn {
    background: var(--navy);
    border: 1px solid var(--navy);
    border-radius: 999px;
    color: #fff;
    font-size: .82rem;
    font-weight: 700;
    padding: .64rem 1rem;
    white-space: nowrap;
}

.nav-contact-btn:hover,
.nav-contact-btn:focus {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--navy);
}

.navbar-flat .language-selector-flat {
    margin-top: 0;
}

.navbar-flat .language-selector-flat .dropdown-toggle {
    border: 0;
    padding: .55rem .5rem;
}

@media (max-width: 1199.98px) {
    .navbar-flat .nav-link-flat {
        font-size: .82rem;
        padding-left: .58rem !important;
        padding-right: .58rem !important;
    }

    .navbar-actions {
        margin-left: .45rem;
    }

    .nav-contact-btn {
        font-size: .76rem;
        padding-left: .75rem;
        padding-right: .75rem;
    }
}

@media (max-width: 1199.98px) {
    .navbar-flat .navbar-collapse {
        background: #fff;
        margin-left: -16px;
        margin-right: -16px;
        padding: .8rem 16px 1rem;
    }

    .navbar-flat .navbar-nav {
        align-items: stretch !important;
        gap: .15rem;
    }

    .navbar-flat .nav-link-flat {
        border-radius: 9px;
        justify-content: space-between;
        padding: .7rem .8rem !important;
        width: 100%;
    }

    .navbar-flat .dropdown-menu.nav-mega-menu {
        border: 0;
        border-radius: 10px;
        box-shadow: none;
        min-width: 0;
        padding: .2rem 0 .35rem 1rem;
        position: static !important;
        transform: none !important;
    }

    .navbar-flat .dropdown-heading {
        display: none;
    }

    .navbar-actions {
        align-items: stretch !important;
        flex-direction: column;
        gap: .55rem;
        margin-left: 0;
        margin-top: .65rem;
    }

    .nav-contact-btn {
        justify-content: center;
        width: 100%;
    }

    .navbar-flat .language-selector-flat,
    .navbar-flat .language-selector-flat .dropdown,
    .navbar-flat .language-selector-flat .dropdown-toggle {
        width: 100%;
    }
}

@media (max-width: 576px) {
    .brand-subline {
        font-size: .5rem;
    }

    .navbar-flat {
        min-height: 68px;
    }
}