/* =============================================
   公共头部样式文件
   包含：头部导航栏、品牌区域、用户菜单、横幅轮播
   ============================================= */

/* =============================================
   头部导航栏样式
   ============================================= */
.header-navbar {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid #e9ecef;
    padding: 0.75rem 0;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
}

.header-brand {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-brand:hover {
    transform: translateY(-1px);
}

.header-brand i {
    font-size: 1.8rem;
    transition: all 0.3s ease;
}

.header-brand:hover i {
    transform: scale(1.1);
}

.brand-text {
    font-weight: 800;
}

.header-user-menu {
    gap: 1rem;
    justify-content: flex-end;
    width: auto;
    margin-left: auto;
}

.header-nav-link {
    color: #495057 !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: 5px;
    transition: all 0.3s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.header-nav-link:hover {
    color: #3498db !important;
    background-color: rgba(52, 152, 219, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.2);
}

.header-nav-link i {
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.header-nav-link:hover i {
    transform: scale(1.1);
}

.header-register-btn {
    border: none !important;
    border-radius: 5px !important;
    padding: 0.5rem 1.25rem !important;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-register-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.header-register-btn i {
    font-size: 1rem;
}

/* =============================================
   导航栏样式
   ============================================= */
.navbar-light.bg-white {
    background: #ffffff !important;
    border-bottom: 1px solid #e9ecef;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-light .navbar-brand {
    color: #007bff;
    font-weight: 600;
    font-size: 1.5rem;
}

.navbar-light .navbar-brand:hover {
    color: #0056b3;
    transform: translateY(-1px);
}

.navbar-light .navbar-brand i {
    margin-right: 8px;
    font-size: 1.3rem;
}

.navbar-light .navbar-nav {
    gap: 0.5rem;
}

.navbar-light .navbar-nav .nav-link {
    color: #495057;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.navbar-light .navbar-nav .nav-link:hover {
    color: #007bff;
    background-color: rgba(0, 123, 255, 0.1);
    transform: translateY(-1px);
}

.navbar-light .navbar-nav .nav-link i {
    margin-right: 6px;
}

.navbar-light .navbar-nav .btn {
    margin-left: 0.5rem;
    padding: 0.5rem 1rem;
    font-weight: 500;
}

.navbar-light .navbar-nav .btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
}

.navbar-dark.bg-primary {
    background: var(--primary-gradient) !important;
}

.navbar {
    min-height: 70px;
    padding: 0;
    box-shadow: none;
}

.navbar-nav.d-flex.flex-row {
    width: 100%;
    justify-content: flex-start;
    align-items: center;
}

.navbar-nav.d-flex.flex-row .nav-item {
    margin-right: 0;
    margin-bottom: 0;
    position: relative;
}

.navbar-nav.d-flex.flex-row .nav-link {
    padding: 12px 20px;
    font-size: 1rem;
    font-weight: 500;
    color: #ffffff;
    transition: all 0.3s ease;
}

.navbar-nav.d-flex.flex-row .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.15);
    transform: none;
    box-shadow: none;
}

.navbar-nav.d-flex.flex-row .nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
    font-weight: 600;
    box-shadow: none;
}

/* =============================================
   横幅轮播样式
   ============================================= */
.banner-carousel-container {
    width: 100%;
    position: relative;
    overflow: hidden;
    margin-bottom: 0;
}

#bannerCarousel {
    width: 100%;
    position: relative;
    overflow: hidden;
}

.carousel-item {
    width: 100%;
    height: 100%;
    position: relative;
}

.banner-content {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-image {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-text {
    text-align: center;
    color: white;
    z-index: 2;
}

.banner-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.banner-description {
    font-size: 1.2rem;
    margin-bottom: 0;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.banner-link {
    display: block;
    width: 100%;
    height: 100%;
    text-decoration: none;
    color: inherit;
}

.banner-link:hover {
    text-decoration: none;
    color: inherit;
}

/* =============================================
   导航栏容器样式
   ============================================= */

/* PC端导航栏样式 */
@media (min-width: 769px) {
    .navbar-nav-container {
        width: 100% !important;
        display: flex !important;
        justify-content: center !important;
        max-width: 100% !important;
        min-width: 100% !important;
        flex: 1 !important;
    }
    
    .navbar-nav-container .navbar-nav {
        width: 100% !important;
        justify-content: flex-start;
        display: flex;
        flex-wrap: nowrap;
    }
    
    .navbar-nav-container .navbar-nav .nav-item {
        text-align: center;
        margin-right: 0;
    }
    
    .navbar-nav-container .navbar-nav .nav-link {
        width: 100%;
        height: 100%;
        padding: 12px 8px;
        font-size: 1rem;
        font-weight: 500;
        color: #ffffff;
        transition: all 0.3s ease;
        border-radius: 5px;
        margin: 0;
        display: block !important;
    }
    
    .navbar-nav-container .navbar-nav .nav-link:hover {
        background-color: rgba(255, 255, 255, 0.15);
        transform: none;
        box-shadow: none;
    }
    
    .navbar-nav-container .navbar-nav .nav-link.active {
        background-color: rgba(255, 255, 255, 0.2);
        font-weight: 600;
        box-shadow: none;
    }
    
    /* PC端导航栏宽度计算 */
    .navbar-nav-container .navbar-nav .nav-item.nav-1-item { width: 100% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-2-item { width: 50% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-3-item { width: 33.3333333% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-4-item { width: 25% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-5-item { width: 20% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-6-item { width: 16.6666666% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-7-item { width: 14.28571425% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-8-item { width: 12.5% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-9-item { width: 11.11111111% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-10-item { width: 10% !important; margin: 0 !important; border: none !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-default { width: 10% !important; margin: 0 !important; border: none !important; }
}

/* =============================================
   响应式设计
   ============================================= */

/* 移动端头部样式优化 */
@media (max-width: 768px) {
    .header-navbar {
        padding: 0.5rem 0;
    }
    
    .header-brand {
        font-size: 1.25rem;
    }
    
    /* brand-text 在移动端也显示，由后面的样式控制 */
    
    .header-user-menu {
        gap: 0.5rem;
    }
    
    .header-nav-link {
        padding: 0.4rem 0.8rem !important;
        font-size: 0.9rem;
    }
    
    /* nav-text 和 btn-text 在移动端也显示，由后面的样式控制 */
    
    .header-register-btn {
        padding: 0.4rem 1rem !important;
        font-size: 0.9rem;
    }
    
    /* 移动端显示brand-text */
    .brand-text {
        display: inline !important;
    }
    
    /* 移动端显示文字，不隐藏 */
    .nav-text {
        display: inline !important;
        font-size: 0.85rem;
    }
    
    /* 移动端显示按钮文字 */
    .btn-text {
        display: inline !important;
        font-size: 0.85rem;
    }
    
    /* 移动端隐藏轮播图片 */
    .banner-carousel-container {
        display: none !important;
    }
    
    /* 移动端隐藏登录和注册按钮的图标 */
    .header-nav-link i,
    .header-register-btn i {
        display: none !important;
    }
    
    /* 移动端导航栏容器样式 */
    .navbar-nav-container {
        width: 100% !important;
        display: flex;
        justify-content: center;
    }
    
    .navbar-nav-container .navbar-nav {
        width: 100% !important;
        justify-content: center;
        display: flex;
        flex-wrap: wrap;
    }
    
    .navbar-nav-container .navbar-nav .nav-item {
        margin-bottom: 0.25rem;
        border-bottom: none;
        margin-right: 0 !important;
        border: none !important;
    }
    
    .navbar-nav-container .navbar-nav .nav-item .nav-link {
        padding: 0.4rem 0.5rem;
        font-size: 0.85rem;
        white-space: nowrap;
        color: #ffffff;
    }
    
    .navbar-nav-container .navbar-nav .nav-item .nav-link i {
        font-size: 0.9rem;
        margin-right: 0.25rem;
    }
    
    /* 移动端导航栏宽度计算 */
    .navbar-nav-container .navbar-nav .nav-item.nav-1-item { width: 100% !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-2-item { width: 50% !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-3-item { width: 33.33333333% !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-4-item { width: 25% !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-5-item { width: 33.33333% !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-6-item { width: 33.3333333% !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-7-item { width: 25% !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-8-item { width: 20% !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-9-item { width: 20% !important; }
    .navbar-nav-container .navbar-nav .nav-item.nav-default { width: 16.66667% !important; }
    
    /* 移动端导航栏样式 */
    .navbar-light .navbar-brand {
        font-size: 1.3rem;
    }
    
    .navbar-light .navbar-nav .nav-link {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .navbar-light .navbar-nav .btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }
    
    .navbar-light .container {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }
    
    /* 横幅轮播移动端样式 */
    #bannerCarousel {
        height: 300px;
    }
    
    .banner-title {
        font-size: 1.5rem;
        margin-bottom: 10px;
    }
    
    .banner-description {
        font-size: 1rem;
    }
    
    .banner-text {
        padding: 15px;
    }
}

@media (max-width: 576px) {
    .header-brand i {
        font-size: 1.5rem;
    }
    
    .header-nav-link i {
        font-size: 1.2rem;
    }
    
    .header-register-btn i {
        font-size: 1.1rem;
    }
    
    /* 横幅轮播超小屏幕样式 */
    #bannerCarousel {
        height: 250px;
    }
    
    .banner-title {
        font-size: 1.2rem;
    }
    
    .banner-description {
        font-size: 0.9rem;
    }
    
    .banner-text {
        padding: 10px;
    }
}

/* PC端横幅轮播样式 */
@media (min-width: 1200px) {
    #bannerCarousel {
        height: 600px;
    }
    
    .banner-title {
        font-size: 3rem;
    }
    
    .banner-description {
        font-size: 1.4rem;
    }
}

@media (min-width: 1600px) {
    #bannerCarousel {
        height: 700px;
    }
    
    .banner-title {
        font-size: 3.5rem;
    }
    
    .banner-description {
        font-size: 1.6rem;
    }
}