/* --- 變數設定 (針對 WCAG 2.1 AAA 規範優化) --- */
        :root {
            --primary-color: #003366; 
            --secondary-color: #f8f9fa;
            --text-color: #222222;
            --text-main: #222222;
            --focus-color: #ffc107;
            --border-color: #dee2e6;
            --hover-bg: #e2e6ea;
            --dropdown-bg: #f4f4f4; 
            --dropdown-border: #dcdcdc;
            
            /* Spacing & Radius */
            --radius-lg: 18px;
            --radius-md: 12px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
            
            /* WCAG Colors */
            --highlight-color: #a80055;
            --focus-bg: #ffc107;
        }

        /* --- 基礎設定 --- */
        body {
            font-family: "Microsoft JhengHei", "Heiti TC", sans-serif;
            margin: 0;
            padding: 0;
            color: var(--text-main);
            line-height: 1.6;
            background-color: #f5f5f7;
            
            /* 背景圖設定 */
            background-image: 
                linear-gradient(rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0.5)), 
                url('bg.png');
            background-attachment: fixed;
            background-position: center;  
            background-repeat: no-repeat; 
            background-size: cover;       
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        p {
            margin-bottom: 1.5em;
        }
        
        .forum_icon {
            display: flex;
            align-items: center;
            gap: 18px;
        }
        
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

        /* --- 1. 跳過導航 (Skip Link) --- */
        .skip-link {
            position: absolute;
            top: -3.125rem;
            left: 0;
            background: #000;
            color: #ffc107;
            padding: 0.625rem;
            z-index: 9999;
            transition: top 0.3s;
            font-weight: bold;
            text-decoration: underline;
        }
        .skip-link:focus {
            top: 0;
            outline: 3px solid var(--focus-color);
        }

        /* --- 2. Header 區域 --- */
        header {
            background-color: #fff;
            box-shadow: 0 0.125rem 0.25rem rgba(0,0,0,0.1);
            position: sticky;           
            top: 2.5rem;       
            width: 100%;       
            z-index: 1000;
        }

        .header-container {
            max-width: 75rem; 
            margin: 0 auto;
            padding: 0.625rem 0.9375rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo a {
            display: flex;
            align-items: center;
            color: var(--primary-color);
            font-size: 1.3rem;
            font-weight: bold;
            white-space: nowrap;
        }

        .logo img {
            height: 3.75rem; /* 60px */
            margin-right: 0.625rem;
            width: auto;
        }

        /* --- 3. 電腦版導航 (Desktop) --- */
        .classynav > ul {
            display: flex; 
            flex-direction: row;
            flex-wrap: nowrap;
            align-items: center;
        }

        .classynav > ul > li {
            position: relative;
            flex-shrink: 0;
        }

        .classynav a {
            display: flex;
            align-items: center;
            padding: 0 0.75rem; 
            font-weight: bold;
            border-bottom: 3px solid transparent;
            white-space: nowrap;
            color: #333; 
            min-height: 2.75rem; 
            box-sizing: border-box;
        }

        .classynav a:hover,
        .classynav a:focus {
            background-color: var(--hover-bg);
            color: var(--primary-color);
            border-bottom-color: var(--primary-color);
        }

        .classynav a:focus-visible {
            outline: 3px solid var(--primary-color);
            outline-offset: -3px;
            background-color: var(--focus-color);
            color: #000;
        }

        .has-submenu > a::after {
            content: "";
            display: inline-block;
            width: 0;
            height: 0;
            margin-left: 0.5rem; 
            vertical-align: middle;
            border-left: 0.3rem solid transparent;
            border-right: 0.3rem solid transparent;
            border-top: 0.35rem solid currentColor; 
            position: relative;
            top: 2px;
            flex-shrink: 0; 
        }

        /* --- 下拉選單 (Level 1) --- */
        .dropdown {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            background-color: var(--dropdown-bg);
            box-shadow: 0 0.25rem 0.5rem rgba(0,0,0,0.2);
            min-width: 15rem;
            border-top: 3px solid var(--primary-color);
            z-index: 2000;
        }

        /* [關鍵修正] 加入 position: relative，讓第三層選單能以它為基準 */
        .dropdown li {
            display: block;
            width: 100%; 
            border-bottom: 1px solid var(--dropdown-border);
            position: relative; /* 確保子選單對齊該選項 */
        }
        
        .dropdown li:last-child {
            border-bottom: none;
        }

        .dropdown a {
            display: flex;
            align-items: center;
            padding: 0.625rem 0.9375rem; 
            font-weight: normal;
            font-size: 0.95rem;
            white-space: nowrap; 
            color: #222; 
            border-bottom: none;
            line-height: 1.5;
            min-height: 2.75rem;
        }

        .dropdown a:hover,
        .dropdown a:focus {
            background-color: var(--primary-color);
            color: #fff; 
        }
		
        /* --- [修正] 第三層選單樣式 (Level 2 Dropdown) --- */
        
        .dropdown-level-2 {
            display: none;
            position: absolute;
            
            /* [修正] top: 0 對齊父項目的頂端 */
            top: 0;
            
            /* [修正] left: 100% 顯示在右側 */
            left: 100%; 
            
            /* [修正] 稍微往左移一點點，蓋住邊框，防止滑鼠移動時斷開 */
            margin-left: -2px;
            
            background-color: var(--dropdown-bg);
            box-shadow: 0 0.25rem 0.5rem rgba(0,0,0,0.2);
            min-width: 12rem;
            border-left: 3px solid var(--primary-color);
            z-index: 2001;
        }

        .dropdown-level-2 li {
            border-bottom: 1px solid var(--dropdown-border);
        }
        .dropdown-level-2 li:last-child {
            border-bottom: none;
        }

        .dropdown-level-2 a {
            display: flex;
            align-items: center;
            padding: 0.625rem 0.9375rem;
            font-size: 0.95rem;
            color: #222;
            white-space: nowrap;
        }

        .dropdown-level-2 a:hover,
        .dropdown-level-2 a:focus {
            background-color: var(--primary-color);
            color: #fff;
        }

        /* 第二層選單箭頭 (指示有下一層) */
        .has-submenu-2 > a::after {
            content: " ▶"; 
            font-size: 0.7em;
            margin-left: auto; 
            opacity: 0.7;
        }

        /* --- 麵包屑導航 --- */
        .breadcrumbs {
            background-color: #f4f4f4;
            padding: 0.5rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #ddd;
            
            /* 固定定位 */
            position: sticky;
            top: 0rem; /* 接在 Header 下方 */
            z-index: 998; 
            width: 100%;
        }
        
        .breadcrumbs-container {
            max-width: 75rem;
            margin: 0 auto;
            padding: 0 0.9375rem;
        }
        
        .breadcrumbs a {
            text-decoration: underline;
            color: var(--primary-color);
        }
        .breadcrumbs a:hover, .breadcrumbs a:focus {
            background-color: var(--focus-color);
            color: #000;
            outline: 2px solid var(--primary-color);
        }

        /* --- 4. 手機版樣式與修正 (RWD) --- */
        .menu-toggle {
            display: none;
            background: none;
            border: 2px solid var(--primary-color);
            font-size: 1.2rem;
            padding: 0 0.625rem;
            min-height: 2.75rem; 
            min-width: 2.75rem;  
            cursor: pointer;
            color: var(--primary-color);
            border-radius: 4px;
        }

        @media (max-width: 1100px) {
            .menu-toggle {
                display: block;
                /* 確保按鈕層級最高 */
                position: relative;
                z-index: 1002; 
            }

            .classynav {
                display: none;
                
                position: fixed; 
                top: 8rem; /* 接在 Header 下方 */
                left: 0;
                right: 0;
                bottom: 0; 
                
                background: #fff;
                border-top: 1px solid var(--border-color);
                
                /* iPhone 網址列遮擋對應 */
                height: calc(100vh - 5rem);
                height: calc(100dvh - 5rem);
                
                overflow-y: auto;
                padding: 20px 20px 250px 20px; /* 底部緩衝 */
                
                -webkit-overflow-scrolling: touch;
                overscroll-behavior: contain;
                
                flex-direction: column;
                z-index: 999;
            }

            .classynav > ul {
                flex-direction: column;
                align-items: stretch;
            }

            .classynav > ul > li {
                width: 100%;
                border-bottom: 1px solid var(--border-color);
            }

            .has-submenu > a::after {
                margin-left: auto;
            }

            .dropdown {
                position: static; 
                box-shadow: none;
                border-top: none;
                background-color: #eeeeee;
                width: 100%;
                padding-left: 0; 
                display: none;
            }
            
            .dropdown a {
                padding: 0.75rem 0.9375rem 0.75rem 1.875rem;
                white-space: normal;
                line-height: 1.4;
                min-height: 2.75rem; 
            }

            /* 手機版第三層選單樣式修正 */
            .dropdown-level-2 {
                position: static; /* 手機版：堆疊顯示 */
                box-shadow: none;
                border-left: none;
                border-top: 1px solid #ddd;
                background-color: #e0e0e0; 
                width: 100%;
                margin-left: 0; /* 清除電腦版設定 */
                display: none; 
            }

            /* 增加縮排 */
            .dropdown-level-2 a {
                padding-left: 3.5rem !important; 
            }

            /* 手機版箭頭改為向下 */
            .has-submenu-2 > a::after {
                content: " ▼"; 
            }
        }

        /* --- 5. 中層：主要內容區樣式 --- */
        main {
            max-width: 75rem;
            margin: 0 auto; 
            padding: 0 0.9375rem;
            min-height: 50vh;
        }
        
        h1.visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            margin: -1px;
            padding: 0;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        .news-container, .info-grid-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0rem 2.5rem;
            margin-bottom: 2.5rem;
        }
        
        .news-container {
            margin-top: 0.625rem; 
            background-color: #ffffe4;
            border-radius: var(--radius-lg);
            border: 1px solid #dee2e6;
            padding: 1.25rem;
            box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.05);
        }
        
        .info-grid-container {
            margin-top: 2.5rem;
        }

        @media (max-width: 768px) {
            .news-container, .info-grid-container {
                grid-template-columns: 1fr;
                gap: 1.25rem;
            }
        }

        .section-title, .info-title {
            grid-column: 1 / -1;
            color: var(--highlight-color);
            font-size: 1.5rem;
            margin-bottom: 1.25rem;
            border-bottom: 2px solid var(--highlight-color);
            padding-bottom: 0.625rem;
            font-weight: bold;
        }
        
        .info-title a {
            color: inherit;
        }
        .info-title a:hover, .info-title a:focus {
            text-decoration: underline;
            outline: 2px solid var(--focus-color);
        }

        .news-list, .info-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .news-item, .info-item {
            position: relative;
            padding-left: 1.25rem;
            margin-bottom: 0.75rem;
            border-bottom: 1px dotted #ccc;
            padding-bottom: 0.5rem;
        }

        .news-item::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0.7rem;
            width: 0.5rem;
            height: 0.5rem;
            background-color: var(--highlight-color);
            border-radius: 50%;
        }
        
        .info-item::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0.9rem;
            width: 0.4rem;
            height: 0.4rem;
            background-color: #444; 
            border-radius: 50%;
        }

        /* --- 列表連結樣式 --- */
        .news-link, .info-link {
            display: flex;
            align-items: center; 
            color: #222; 
            text-decoration: none;
            font-size: 1rem;
            font-weight: 500;
            line-height: 1.5;
            min-height: 2rem; 
            padding: 2px 0;
        }

        .news-link:hover, .news-link:focus,
        .info-link:hover, .info-link:focus {
            color: var(--primary-color);
            text-decoration: underline;
            background-color: var(--focus-color);
            color: #000;
            outline: 2px solid var(--primary-color);
        }

        /* --- 熱門標籤 (Badge) --- */
        .badge-hot {
            display: inline-block;
            background-color: var(--highlight-color);
            color: #fff;
            font-size: 0.8em;
            font-weight: bold;
            padding: 2px 6px;
            border-radius: 8px;
            margin-right: 8px; 
            white-space: nowrap; 
            flex-shrink: 0;
        }

        /* 資訊區塊樣式 */
        .info-section {
            background-color: #fff9f2;
            border-radius: var(--radius-lg);
            border: 1px solid #dee2e6;
            padding: 1.25rem;
            box-shadow: 0 0.125rem 0.25rem rgba(0,0,0,0.05);
        }

        /* --- 6. Footer --- */
        footer {
            background-color: #222; 
            color: #fff;
            padding: 1.875rem 0.9375rem;
            text-align: center;
            font-size: 0.95rem;
            line-height: 1.6;
        }
        
        .footer-container {
            max-width: 75rem; 
            margin: 0 auto;
        }

        footer a {
            color: #ffc107; 
            text-decoration: none;
            border-bottom: 1px dotted #ffc107;
        }

        footer a:hover,
        footer a:focus {
            color: #000;
            background-color: #ffc107;
            text-decoration: underline;
            outline: 2px solid #fff;
        }

        .contact-info {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 0.9375rem;
        }

        .divider {
            display: inline-block;
            margin: 0 0.3125rem;
            color: #ccc;
        }

        .en-text {
            display: block;
            font-size: 0.9em;
            color: #ddd; 
            margin-top: 0.125rem;
        }

        @media (max-width: 768px) {
            .contact-info {
                flex-direction: column;
                gap: 0.3125rem;
            }
            .divider {
                display: none;
            }
        }