/* ===== AIHUB 导航栏样式 ===== */
/* 顶部导航栏和搜索功能 */

/* 导航栏基础样式 */
.aihub-navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--aihub-space-4) var(--aihub-space-6);
    height: var(--aihub-navbar-height);
}

/* 品牌标识 */
.aihub-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--aihub-white);
    font-weight: 700;
    font-size: var(--aihub-font-lg);
    transition: var(--aihub-transition);
}

.aihub-brand:hover {
    color: var(--aihub-white);
    text-decoration: none;
    transform: translateY(-1px);
}

.aihub-brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    margin-right: var(--aihub-space-3);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--aihub-radius-lg);
    backdrop-filter: blur(10px);
}

.aihub-brand-icon i {
    font-size: 1.5rem;
    color: var(--aihub-white);
}

.aihub-brand-text {
    display: flex;
    flex-direction: column;
}

.aihub-brand-title {
    font-size: var(--aihub-font-xl);
    font-weight: 700;
    line-height: 1.2;
}

.aihub-brand-subtitle {
    font-size: var(--aihub-font-xs);
    opacity: 0.8;
    line-height: 1;
}

/* 导航菜单 */
.aihub-nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--aihub-space-2);
}

.aihub-nav-item {
    position: relative;
}

.aihub-nav-link {
    display: flex;
    align-items: center;
    padding: var(--aihub-space-2) var(--aihub-space-4);
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: var(--aihub-radius);
    transition: var(--aihub-transition);
    font-weight: 500;
}

.aihub-nav-link:hover,
.aihub-nav-link.active {
    color: var(--aihub-white);
    background-color: rgba(255, 255, 255, 0.1);
    text-decoration: none;
}

.aihub-nav-link i {
    margin-right: var(--aihub-space-2);
    font-size: var(--aihub-font-sm);
}

/* 下拉菜单 */
.aihub-dropdown {
    position: relative;
}

.aihub-dropdown-toggle {
    display: flex;
    align-items: center;
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    padding: var(--aihub-space-2) var(--aihub-space-4);
    border-radius: var(--aihub-radius);
    transition: var(--aihub-transition);
    font-weight: 500;
}

.aihub-dropdown-toggle:hover {
    color: var(--aihub-white);
    background-color: rgba(255, 255, 255, 0.1);
}

.aihub-dropdown-toggle::after {
    content: '';
    display: inline-block;
    margin-left: var(--aihub-space-2);
    vertical-align: 0.255em;
    border-top: 0.3em solid;
    border-right: 0.3em solid transparent;
    border-bottom: 0;
    border-left: 0.3em solid transparent;
    transition: var(--aihub-transition);
}

.aihub-dropdown.show .aihub-dropdown-toggle::after {
    transform: rotate(180deg);
}

.aihub-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1000;
    display: none;
    min-width: 200px;
    padding: var(--aihub-space-2) 0;
    margin: var(--aihub-space-1) 0 0;
    background-color: var(--aihub-white);
    border: 1px solid var(--aihub-gray-200);
    border-radius: var(--aihub-radius-lg);
    box-shadow: var(--aihub-shadow-lg);
    backdrop-filter: blur(10px);
}

.aihub-dropdown-menu.show {
    display: block;
    animation: aihubFadeInDown 0.2s ease-out;
}

.aihub-dropdown-item {
    display: block;
    width: 100%;
    padding: var(--aihub-space-3) var(--aihub-space-4);
    color: var(--aihub-gray-700);
    text-decoration: none;
    background-color: transparent;
    border: 0;
    transition: var(--aihub-transition);
    font-size: var(--aihub-font-sm);
}

.aihub-dropdown-item:hover {
    color: var(--aihub-primary);
    background-color: var(--aihub-gray-50);
    text-decoration: none;
}

.aihub-dropdown-item i {
    margin-right: var(--aihub-space-2);
    width: 16px;
    text-align: center;
}

/* 搜索区域 */
.aihub-search-container {
    display: flex;
    align-items: center;
    margin-left: var(--aihub-space-6);
}

.aihub-search-form {
    position: relative;
    display: flex;
    align-items: center;
}

.aihub-search-input {
    width: 300px;
    padding: var(--aihub-space-3) var(--aihub-space-12) var(--aihub-space-3) var(--aihub-space-4);
    font-size: var(--aihub-font-sm);
    color: var(--aihub-white);
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--aihub-radius-full);
    backdrop-filter: blur(10px);
    transition: var(--aihub-transition);
}

.aihub-search-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.aihub-search-input:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.4);
    background-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 0.2rem rgba(255, 255, 255, 0.25);
}

.aihub-search-button {
    position: absolute;
    right: var(--aihub-space-2);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    padding: var(--aihub-space-2);
    border-radius: var(--aihub-radius);
    transition: var(--aihub-transition);
}

.aihub-search-button:hover {
    color: var(--aihub-white);
    background-color: rgba(255, 255, 255, 0.1);
}

/* 移动端导航切换按钮 */
.aihub-navbar-toggler {
    display: none;
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--aihub-white);
    padding: var(--aihub-space-2) var(--aihub-space-3);
    border-radius: var(--aihub-radius);
    cursor: pointer;
    transition: var(--aihub-transition);
}

.aihub-navbar-toggler:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.aihub-navbar-toggler-icon {
    display: inline-block;
    width: 1.5em;
    height: 1.5em;
    vertical-align: middle;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 100%;
}

/* 响应式导航 */
@media (max-width: 991.98px) {
    .aihub-navbar-toggler {
        display: block;
    }
    
    .aihub-nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--aihub-primary) 0%, var(--aihub-primary-hover) 100%);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        flex-direction: column;
        padding: var(--aihub-space-4);
        gap: var(--aihub-space-1);
    }
    
    .aihub-nav-menu.show {
        display: flex;
        animation: aihubSlideDown 0.3s ease-out;
    }
    
    .aihub-search-container {
        margin-left: 0;
        margin-top: var(--aihub-space-4);
        width: 100%;
    }
    
    .aihub-search-input {
        width: 100%;
    }
}

@media (max-width: 767.98px) {
    .aihub-navbar-container {
        padding: var(--aihub-space-3) var(--aihub-space-4);
    }
    
    .aihub-brand-text {
        display: none;
    }
    
    .aihub-brand-icon {
        margin-right: 0;
    }
    
    .aihub-search-input {
        width: 100%;
        font-size: var(--aihub-font-xs);
    }
}

/* 动画效果 */
@keyframes aihubFadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes aihubSlideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 导航栏状态指示器 */
.aihub-nav-indicator {
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--aihub-white);
    transition: var(--aihub-transition);
}

.aihub-nav-link.active .aihub-nav-indicator,
.aihub-nav-link:hover .aihub-nav-indicator {
    width: 100%;
}

/* 搜索建议下拉 */
.aihub-search-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--aihub-white);
    border: 1px solid var(--aihub-gray-200);
    border-top: none;
    border-radius: 0 0 var(--aihub-radius-lg) var(--aihub-radius-lg);
    box-shadow: var(--aihub-shadow-lg);
    max-height: 300px;
    overflow-y: auto;
    z-index: 1001;
    display: none;
}

.aihub-search-suggestions.show {
    display: block;
}

.aihub-search-suggestion {
    padding: var(--aihub-space-3) var(--aihub-space-4);
    color: var(--aihub-gray-700);
    cursor: pointer;
    transition: var(--aihub-transition);
    border-bottom: 1px solid var(--aihub-gray-100);
}

.aihub-search-suggestion:hover {
    background-color: var(--aihub-gray-50);
    color: var(--aihub-primary);
}

.aihub-search-suggestion:last-child {
    border-bottom: none;
}

/* 通知徽章 */
.aihub-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 var(--aihub-space-1);
    font-size: var(--aihub-font-xs);
    font-weight: 600;
    color: var(--aihub-white);
    background-color: var(--aihub-danger);
    border-radius: var(--aihub-radius-full);
    border: 2px solid var(--aihub-white);
}

/* 用户头像和菜单 */
.aihub-user-menu {
    position: relative;
    margin-left: var(--aihub-space-4);
}

.aihub-user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--aihub-radius-full);
    border: 2px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: var(--aihub-transition);
}

.aihub-user-avatar:hover {
    border-color: rgba(255, 255, 255, 0.4);
    transform: scale(1.05);
}

/* 面包屑导航 */
.aihub-breadcrumb {
    display: flex;
    align-items: center;
    padding: var(--aihub-space-3) 0;
    font-size: var(--aihub-font-sm);
    color: var(--aihub-gray-600);
}

.aihub-breadcrumb-item {
    display: flex;
    align-items: center;
}

.aihub-breadcrumb-item + .aihub-breadcrumb-item::before {
    content: '/';
    margin: 0 var(--aihub-space-2);
    color: var(--aihub-gray-400);
}

.aihub-breadcrumb-link {
    color: var(--aihub-gray-600);
    text-decoration: none;
    transition: var(--aihub-transition);
}

.aihub-breadcrumb-link:hover {
    color: var(--aihub-primary);
    text-decoration: none;
}

.aihub-breadcrumb-current {
    color: var(--aihub-gray-900);
    font-weight: 500;
}