/* 1. 基礎重設與全站背景 */
body {   
    margin: 0;
    padding: 0;
    font-family: "Arial", sans-serif;
    color: #4d4d4d;
    background-color: #f8f9fa; /* 給予淡淡的底色，增加閱讀舒適度 */
}

/* 2. Header 漸層設計 */
.main-header {
    background: linear-gradient(180deg, #0096e7 0%, #7eb6ed 100%) no-repeat;
    padding: 10px 0;
}

.header-logo {
    height: 80px;
    width: auto;
    transition: transform 0.3s;
}

.header-logo:hover { transform: scale(1.05); }

/* 3. 導覽列優化 */
.navbar-dark .nav-link {
    color: rgba(255, 255, 255, 0.95) !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    font-weight: 500;
}
.navbar-dark .nav-link:hover { color: #fff !important; text-decoration: underline; }

/* 4. 品牌色彩與自定義組件 */
.text-brand-blue { color: #2188C3; }
.bg-brand-green { background-color: #68B93A !important; }
h1, h2, h3, h4 { font-family: Arial Rounded MT Bold,"Arial Black", Gadget, sans-serif;}

ul#submenu_ul{
    padding-left:10px;    
}
#submenu_ul li{
    list-style-type: none;
    margin: 0;
    padding: 0 ;
    background-color:#ddd;
    border-bottom: 1px solid #fff;
}

#submenu_ul li:hover{
    background-color:#74c147;
}

#left_menu ul li a{
    text-decoration: none;
    display: block;
    padding: 5px 2em 5px 2em;
    margin: 0 0 0 0.5em;
    background-color:#eef5f1;
    color: #4d4d4d;
    font-size: small;
    border-bottom:#ffffff solid 1px;
}
#left_menu ul#submenu_ul li.active a {
    background-color:#5bb825;    
    color: #ffffff ;   /* 強制改為白色 */
}
.bg_theme_green { 
    background-color: #248a47;
}
.submenu_title{
    background-color: #209E4D;
    border-bottom:#fff 1px solid;
    color:#fff;
    font-size: 1rem;
};