* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    color: var(--text-color);
    background-color: var(--background-color);
    padding-top: 0px;
}

.left-aligned {
    margin-left: auto;
}

.navbar-brand-wrapper {
    display: flex;
    align-items: center;
}

.navbar-logo {
    width: 110px; /* 调整 logo 宽度 */
    height: auto; /* 保持宽高比 */
}




/* CALLOUT */
.bd-callout {
    padding: 1.25rem;
    margin-top: 1.25rem;
    margin-bottom: 1.25rem;
    border: 1px solid #e9ecef;
    border-left-width: 0.25rem;
    border-radius: 0.25rem;
}

.bd-callout h4 {
    margin-bottom: 0.25rem;
}

.bd-callout p:last-child {
    margin-bottom: 0;
}

.bd-callout code {
    border-radius: 0.25rem;
}

.bd-callout + .bd-callout {
    margin-top: -0.25rem;
}

.bd-callout-info {
    border-left-color: #5bc0de;
}

.bd-callout-warning {
    border-left-color: #f0ad4e;
}

.bd-callout-danger {
    border-left-color: #d9534f;
}


.nav-link {
    color: #ffffff; 
    background-image: var(--button-gradient); 
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-image 0.3s ease, transform 0.3s ease;
}

.nav-link:hover,
.nav-link:focus {
    background-image: var(--hover-gradient); 
    transform: scale(1.1);
    color:#e9ecef;
}


.navbar-nav .nav-link {
    position: relative;
    display: inline-block; 
    padding: 10px 15px; 
    margin-top: 15px;
    margin-bottom: 15px;
    margin-right: 10px;
    margin-left: 10px;
}


.navbar-nav .nav-link::before,
.navbar-nav .nav-link::after {
    content: ''; 
    position: absolute;
    width: 100%; 
    height: 2.5px; 
    background-color: #ffffff; 
    left: 0;
    transition: transform 0.3s ease; 
}


.navbar-nav .nav-link::before {
    top: 0; 
    transform: scaleX(0);
    transform-origin: left;
}


.navbar-nav .nav-link::after {
    bottom: 0;
    transform: scaleX(0);
    transform-origin: right; 
}


.navbar-nav .nav-link:hover::before,
.navbar-nav .nav-link:hover::after {
    transform: scaleX(1); 
}


.dropdown-menu {
    background-color: var(--primary-color);
    border: none;
    border-radius: 0.5rem; 
    display: none;
    transition: all 0.3s ease; 
}

.dropdown:hover .dropdown-menu {
    display: block;
}

/* */
.navbar-nav .dropdown-menu {
    background-color: rgb(104 104 104 / 80%);
    border: none; 
}

.navbar-nav .dropdown-item {
    color: #ffffff; 
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.navbar-nav .dropdown-item:hover {
    transform: scale(1.1);
    
}


@media (max-width: 992px) {
    .navbar-collapse {
        background-color: var(--primary-color);
    }
}

/* footer */
.footer {
    position: relative;
    overflow: hidden;
    background-color: #333;
    color: white;
    padding: 20px;
}