/* Common Navigation Styles */

/* PC mode navigation display */
@media (min-width: 992px) {
    .navbar-collapse {
        display: flex !important;
        visibility: visible !important;
    }
}

/* Mobile mode navigation styles */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background-color: #fff;
        border: 1px solid #dee2e6;
        border-radius: 0.375rem;
        margin-top: 0.5rem;
        padding: 1rem;
        box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    }
    
    .navbar-collapse.show {
        display: block !important;
        visibility: visible !important;
    }
}

/* Navigation collapse transition */
.navbar-collapse {
    transition: none;
}

.navbar-collapse.collapsing {
    transition: height 0.35s ease;
}

/* Navigation toggler styles */
.navbar-toggler {
    border: 1px solid #dee2e6;
    padding: 0.375rem 0.75rem;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2833, 37, 41, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Navigation link styles */
.navbar-nav .nav-link {
    color: #495057 !important;
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: color 0.15s ease-in-out;
}

.navbar-nav .nav-link:hover {
    color: #0d6efd !important;
}

.navbar-nav .nav-link:focus {
    color: #0d6efd !important;
}

/* Dropdown styles */
.dropdown-menu {
    border: 1px solid #dee2e6;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.dropdown-item:hover {
    background-color: #f8f9fa;
    color: #0d6efd;
}

/* Fixed navbar padding adjustment */
body {
    padding-top: 76px;
}

/* 防止导航加载时的布局跳动 */
#header-placeholder {
    min-height: 0;
    position: relative;
}

/* 导航加载状态样式 */
#header-placeholder .spinner-border {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* 平滑过渡效果 */
#header-placeholder, #footer-placeholder {
    transition: opacity 0.2s ease-in-out;
}

/* 组件加载完成后的淡入效果 */
.component-loaded {
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}