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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, #E8E8E8 0%, #D4D4D4 100%);
}

.header {
    background: linear-gradient(180deg, #5A7A9A 0%, #3D5A6C 50%, #2C3E50 100%);
    color: white;
    padding: 20px 0;
    text-align: center;
    border-bottom: 3px solid #1A252F;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header p {
    font-size: 1.1em;
    color: #B8C5D0;
}

.navbar {
    background: linear-gradient(180deg, #4A6A8A 0%, #3D5A6C 100%);
    padding: 15px 0;
    display: flex;
    justify-content: space-between;
    border-bottom: 2px solid #2C3E50;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.navbar ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 15px;
}

.navbar a {
    color: white;
    text-decoration: none;
    font-size: 1em;
    padding: 0px 15px;
    border-radius: 5px;
    transition: all 0.3s;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

.navbar a:hover {
    background: linear-gradient(180deg, #6A8AAA 0%, #5A7A9A 100%);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.navbar span{
    color: #fff;
    font-size: 1em;
    transition: all 0.3s;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

.container {
    /* max-width: 1200px; */
    margin: 30px auto;
    padding: 0 20px;
}

.content {
    background: linear-gradient(135deg, #FFFFFF 0%, #F5F5F5 100%);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    min-height: 400px;
    border: 1px solid #C0C0C0;
    border-top: 4px solid #5A7A9A;
}

.content h2 {
    color: #3D5A6C;
    margin-bottom: 20px;
    font-size: 2em;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.content p {
    color: #4A4A4A;
    margin-bottom: 15px;
    font-size: 1.1em;
}

.content ul {
    margin-left: 30px;
    color: #4A4A4A;
    font-size: 1.1em;
}

.footer {
    background: linear-gradient(180deg, #2C3E50 0%, #1A252F 100%);
    color: #B8C5D0;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
    border-top: 3px solid #5A7A9A;
    box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.3);
}

.footer p {
    margin: 5px 0;
}
/*  */
.navbar .dropdown {
    position: relative;
    display: inline-block;
    margin-right: 20px;
}

.navbar .dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    background: linear-gradient(180deg, #6A8AAA 0%, #5A7A9A 100%);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.navbar .dropdown-toggle:hover {
    background: linear-gradient(180deg, #7A9ABA 0%, #6A8AAA 100%);
}

.navbar .dropdown-arrow {
    font-size: 0.7em;
    transition: transform 0.3s ease;
}

.navbar .dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.navbar .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: linear-gradient(135deg, #FFFFFF 0%, #F5F5F5 100%);
    min-width: 137px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    border: 1px solid #C0C0C0;
    border-radius: 5px;
    padding: 10px 0;
    margin-top: 1px;
    z-index: 1000;
}

.navbar .dropdown:hover .dropdown-menu {
    display: block;
    animation: fadeIn 0.3s ease;
}

/*  */
.dropdown-menu .backend {
    position: relative;}

.dropdown-menu .backend .backend-toggle {
    display: flex;align-items: center;gap: 1px;justify-content: start;}
.dropdown-menu .backend .backend-toggle:hover {
    background: linear-gradient(180deg, #7A9ABA 0%, #6A8AAA 100%);
}
.dropdown-menu .backend .backend-toggle .backend-arrow {
    font-size: 0.7em;transition: transform 0.3s ease;color: black;}
.dropdown-menu .backend .backend-toggle:hover .backend-arrow {
    transform: rotate(180deg);color: white;}
.dropdown-menu .backend .backend-menu {
    display: none;position: absolute;top: 0;left: -100%;min-width: 100%;z-index: 1000;
    background: linear-gradient(135deg, #FFFFFF 0%, #F5F5F5 100%);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    border-radius: 5px;}
.dropdown-menu .backend:hover .backend-menu {
    display: block;animation: fadeIn 0.3s ease;}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.navbar .dropdown-menu li {
    list-style: none;
}

.navbar .dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: #3D5A6C;
    text-decoration: none;
    font-size: 0.95em;
    transition: all 0.3s;
    text-shadow: none;
    border-radius: 0;
}

.navbar .dropdown-menu li:last-child::before {
    content: '';
    display: block;
    width: 80%;
    margin: 0 auto;
    border-bottom: 1px solid #C0C0C0;
}
.dropdown-menu .backend li:last-child::before{
    border-bottom: 0px solid #C0C0C0;
}

.navbar .dropdown-menu a:hover {
    background: linear-gradient(180deg, #6A8AAA 0%, #5A7A9A 100%);
    color: white;
    box-shadow: none;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 2em;
    }
    
    .header p {
        font-size: 1em;
    }
    
    .navbar {
        padding: 10px 0;
        flex-direction: column;
        align-items: center;
    }
    
    .navbar ul {
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
    }
    
    .navbar a {
        padding: 8px 12px;
        font-size: 0.9em;
    }
    
    .container {
        margin: 20px auto;
        padding: 0 15px;
    }
    
    .content {
        padding: 20px;
        min-height: 300px;
    }
    
    .content h2 {
        font-size: 1.5em;
    }
    
    .footer {
        padding: 15px 0;
    }
    
    .navbar .dropdown {
        margin-right: 15px;
    }
    
    .navbar .dropdown-menu {
        min-width: 120px;
        right: -20px;
    }
    
    .dropdown-menu .backend .backend-menu {
        left: -120px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8em;
    }
    
    .header p {
        font-size: 0.9em;
    }
    
    .navbar ul {
        flex-direction: column;
        align-items: center;
        gap: 5px;
    }
    
    .navbar a {
        display: block;
        width: 100%;
        text-align: center;
        padding: 10px;
    }
    
    .content {
        padding: 15px;
    }
    
    .content h2 {
        font-size: 1.3em;
    }
    
    .footer p {
        font-size: 0.9em;
    }
}