html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

.main {
    width:1200px;
    margin: 0 auto;
}

.full-width-background {
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    pointer-events: none;
}

#banner img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    object-position: center;
}

#breadcrumb {
    width: 100%;
    line-height: 40px;
    padding: 30px 10px;
    font-family: Arial;
}

#breadcrumb a, #breadcrumb span {
    font-size: 12px;
    color: #666666;
    font-weight: normal;
    font-style: normal;
    text-decoration: none;
    word-wrap: break-word;
    word-break: normal;
}

.container {
    width: 100%;
    min-height: 400px;
    display: flex;
    flex-direction: row;
    gap: 50px;
}

#sidebar {
    width: 250px;
    flex-shrink: 0;
    font-family: Arial, sans-serif;
}

#sidebar .sidebar-title {
    font-size: 24px;
    font-family: Arial;
    font-weight: bold;
    padding: 15px 10px;
    background: #333333;
    color: #ffffff;
    text-decoration: none;
    font-style: normal;
    text-align: left;
    cursor: pointer;
}

#sidebar .menu-item {
    border-bottom: 1px solid #cccccc;
}

#sidebar .menu-title.active, #sidebar .menu-title:hover {
    font-weight: bold;
    background: #F3F3F3;
}

#sidebar .menu-title {
    font-size: 16px;
    font-family: Arial;
    color: #444444;
    font-style: normal;
    text-decoration: none;
    padding: 15px 10px;
    margin: 0;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#sidebar .menu-item a.menu-title {
    display: block;
    text-decoration: none;
    color: #000;
}

#sidebar .submenu {
    display: none;
    background: #eeeeee;
}

#sidebar .submenu.active {
    display: block;
}

#sidebar .submenu a {
    display: block;
    padding: 12px 15px;
    color: #000;
    text-decoration: none;
    font-size: 15px;
    line-height: 20px;
}

#sidebar .submenu a:hover, #sidebar .submenu a.active {
    background: #cccccc;
    font-weight: bold;
}

/* 箭头样式 */
#sidebar .arrow {
    border: solid #333;
    border-width: 2px 2px 0 0;
    width: 8px;
    height: 8px;
    transform: rotate(45deg);
    transition: 0.2s;
}

#sidebar .menu-item.open .arrow {
    transform: rotate(135deg);
}