:root {
            --sidebar-width: 50%;
            --page-padding: 1rem; 
            
            /* 間距設定保持不變 */
            --spacing-text-to-bottom-img: 1.5rem;
            --spacing-img-to-bottom-text: 0.75rem; 
            
            /* [修改這裡] 顏色系統：將原本的 rgba 改為 #000000 (純黑) */
            --color-text: #000000;           /* 一般文字純黑 */
            --color-secondary: #000000;      /* 連結與次要文字純黑 (這會讓左側欄位變黑) */
            
            /* 保持灰色給說明文字用 */
            --color-caption: rgba(0, 0, 0, 0.4);
            --color-bg: #ffffff;
            --color-line: rgba(0, 0, 0, 0.15);
        }

        /* =========================================
           核心響應式引擎 (Responsive Engine)
           ========================================= */
        
        html {
            /* [區間 3] 手機/小視窗 (< 900px) */
            font-size: 12.5px; 
            
            font-family: 'Inter', Helvetica, Arial, sans-serif;
            -webkit-font-smoothing: antialiased;
            background-color: var(--color-bg);
            letter-spacing: -0.02em; 
        }

        /* [區間 2] 中等視窗 (900px ~ 1462px) */
        @media (min-width: 900px) {
            html {
                font-size: 15px;
            }
        }

        /* [區間 1] 大視窗 (> 1462px) */
        @media (min-width: 1462px) {
            html {
                font-size: 1.05vw;
            }
        }

        /* =========================================
           通用樣式
           ========================================= */

        body {
            margin: 0;
            padding: 0;
            color: var(--color-text);
            line-height: 1.1; 
            overflow-x: hidden;
            transition: padding-right 0s; 
        }

        a { text-decoration: none; color: inherit; border-bottom: none; cursor: pointer; }
        a:hover { color: var(--color-text); }
        ul, ol { margin: 0; padding: 0; list-style: none; }
        
        h1, h2, h3, h4, p { margin: 0; font-weight: 400; line-height: 1; }

        .fw-medium { font-weight: 500; }
        .text-caption { color: var(--color-caption); font-size: 1rem; }
        
        .text-body { 
            font-size: 1.2rem; 
            line-height: 1.15; 
            margin-bottom: 0.25rem; 
            color: var(--color-text); 
        }
        
        /* ------------------------------------------------
           Desktop Sidebar (左側欄)
           ------------------------------------------------ */
        .left-sidebar {
            position: fixed; top: 0; left: 0; width: var(--sidebar-width); height: 100vh;
            padding: var(--page-padding); box-sizing: border-box; z-index: 10;
            display: flex; flex-direction: column; justify-content: flex-start;
            overflow-y: auto; padding-right: 3rem; 
        }

        .main-content {
            margin-left: var(--sidebar-width);
            width: calc(100% - var(--sidebar-width));
            min-height: 100vh; position: relative; z-index: 1;
            padding-top: var(--page-padding); padding-bottom: 4rem;
            display: flex; flex-direction: column; align-items: flex-end; 
        }

        .content-container {
            width: 100%; padding-right: var(--page-padding); padding-left: 1.5rem; 
            box-sizing: border-box;
        }

        /* ------------------------------------------------
           元件樣式
           ------------------------------------------------ */
        .header-row { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 0; width: 100%; }
        .header-row h1 { font-size: 2.2rem; line-height: 1; color: var(--color-text); flex: 1; padding-right: 2rem; letter-spacing: -0.03em; }
        .index-link-inline { font-size: 2rem; color: var(--color-secondary); text-align: right; white-space: nowrap; line-height: 1; font-weight: 500; }

        .site-title { font-size: 2rem; margin-bottom: 3.5rem; color: var(--color-text); line-height: 1.1; font-weight: 900; }
        
        .nav-links { margin-bottom: 3.5rem; font-size: 2rem; line-height: 1.0; }
        .nav-links a {
            display: block;
            color: #000000; /* 改為黑色 */
            font-weight: 500;
            margin-bottom: 0;
        }

        /* Hover 時維持黑色或稍微調整透明度 */
        .nav-links a:hover {
            color: rgba(0, 0, 0, 0.6) !important; /* 60% 黑色 */
            opacity: 1 !important; /* 確保不透明度為 1，避免顏色過淡 */
            transition: color 0.2s ease;
        }
        
        .project-list-title, .project-list { font-size: 2rem; color: var(--color-secondary); line-height: 1.0; }
        .project-list-title { color: var(--color-text); margin-bottom: 0.5rem; font-weight: 500; }
        .project-list li { margin-bottom: 0; display: flex; }
        .project-list a { font-weight: 500; }
        .project-list .num { width: 1.5em; color: #000000; }
        .project-list a { color: #000000; }

        /* 2. 針對 1-7 的專案列表按鈕 */
        .project-list a:hover {
            color: rgba(0, 0, 0, 0.6) !important; /* 60% 黑色 */
            transition: color 0.2s ease;
        }

        .project-subtitle { font-size: 2.2rem; color: var(--color-caption); margin-bottom: 1.5rem; line-height: 1; }
        .project-meta { font-size: 1.2rem; font-weight: 500; line-height: 1.25; color: var(--color-text); margin-bottom: var(--spacing-text-to-bottom-img); }
        
        .media-item { width: 100%; margin-bottom: var(--spacing-img-to-bottom-text); position: relative; }
        .media-item img { width: 100%; height: auto; display: block; }

        .text-columns { 
            display: flex; 
            flex-direction: column; 
            gap: 0.5rem; 
            margin-bottom: var(--spacing-text-to-bottom-img); 
            width: 100%; 
        }
        .text-col-left { 
            flex: 0 0 auto; 
            width: 100%; 
        }
        .text-col-right { 
            flex: 1; 
            width: 100%; 
        }
        .text-columns h3 { 
            font-size: 1.2rem; 
            line-height: 1.15; 
            font-weight: 500; 
            color: var(--color-text); 
        }
        
        /* =========================================
           Overlays (Popup Pages)
           ========================================= */
        #info-overlay, #mobile-menu-overlay {
            display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 9999;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(5px); -webkit-backdrop-filter: blur(5px);
            overflow-y: auto; 
        }

        /* Info Overlay Styles */
        .overlay-wrapper { display: flex; width: 100%; min-height: 100%; }
        .overlay-sidebar { width: 50%; padding: var(--page-padding); padding-right: 3rem; box-sizing: border-box; }
        .overlay-content { width: 50%; padding: var(--page-padding); padding-left: 1.5rem; padding-bottom: 4rem; box-sizing: border-box; }
        
        #info-overlay .profile-photo { width: 100%; max-width: 450px; margin-bottom: 1.5rem; display: block; background-color: rgba(0,0,0,0.05); }
        #info-overlay .bio-text { font-size: 1.2rem; line-height: 1.4; color: var(--color-text); max-width: 80%; font-weight: 500; }
        #info-overlay .bio-text p {
            margin: 0;
            line-height: 1.4; /* 同步設定 */
        }
        #info-overlay .header-row { width: 100%; display: flex; justify-content: space-between; margin-bottom: 0.5rem; }

        .cv-container { margin-top: 3.0rem; width: 100%; padding-right: var(--page-padding); box-sizing: border-box; }
        
        /* CV 項目分隔線設定 */
        .cv-container .text-columns { 
            display: flex; 
            gap: 2rem; 
            padding-bottom: 1.5rem;
            margin-bottom: 1.5rem;
            border-bottom: 2px solid #000000;
        }
        /* 移除最後一個項目的底線 */
        .cv-container .text-columns:last-child {
            border-bottom: none;
            margin-bottom: 3rem; 
        }
        
        /* CV 標題加粗且為黑色 */
        .cv-container h3 { 
            font-size: 1.2rem; 
            color: #000000; 
            line-height: 1.15; 
            font-weight: 700; 
            margin-top: 0.1rem; 
        }
        
        .cv-item { margin-bottom: 1.5rem; }
        .cv-title { font-weight: 500; margin-bottom: 0.2rem; font-size: 1.2rem; }

        /* 資訊視窗內的說明資訊 (如 09/2014-06/2019, Issued by...) */
        .cv-container .text-caption {
            color: var(--color-caption) !important;
            font-size: 1rem;
        }

        /* 確保學歷、職稱與內文是黑色 */
        .cv-container .cv-title,
        .cv-container .text-body {
            color: #000000;
        }

        /* =========================================
           RWD: Mobile Layout (< 900px)
           ========================================= */
        .mobile-header, .mobile-footer { display: none; }

        @media (max-width: 900px) {
            /* --- 其他手機版設定 (Sidebar 隱藏等) --- */
            :root { --sidebar-width: 0px; }
            .left-sidebar { display: none; }
            .mobile-hidden { display: none !important; }
            .mobile-header { display: flex; justify-content: space-between; padding: 1rem; position: fixed; top: 0; left: 0; width: 100%; background: rgba(255, 255, 255, 0.98); z-index: 90; border-bottom: 1px solid var(--color-line); box-sizing: border-box; }
            .mobile-header a { font-size: 1.8rem; font-weight: 500; cursor: pointer; line-height: 1; letter-spacing: -0.02em; }
            .mobile-footer { display: flex; justify-content: space-between; padding: 1rem; position: fixed; bottom: 0; left: 0; width: 100%; background: rgba(255, 255, 255, 0.98); z-index: 90; border-top: 1px solid var(--color-line); box-sizing: border-box; }
            .mobile-footer a { font-size: 1.8rem; font-weight: 500; cursor: pointer; line-height: 1; letter-spacing: -0.02em; }
            .main-content { 
                margin-left: 0; 
                width: 100%; 
                align-items: flex-start;
                padding: 5rem 1rem 5rem 1rem; 
                box-sizing: border-box; 
            }
            .content-container { 
                width: 100%; 
                padding: 0 !important; 
                box-sizing: border-box;
            }
            .index-link-inline { display: none; }
            
            /* --- 修正區 --- */

            /* 1. 恢復標題下方的呼吸空間 */
            .header-row {
                margin-bottom: 0rem !important; 
            }
            .header-row h1 { 
                font-size: 1.8rem; 
                padding-right: 0; 
                margin-bottom: 0.5rem !important; /* 改回 0.5rem，不再是 0 */
                line-height: 1; 
            }

            /* 2. 資訊區塊 (Year...) 的上下距離維持你滿意的 2.5rem */
            .project-subtitle {
                font-size: 1.8rem;
                margin-bottom: 2.5rem !important; /* 上方距離 */
            }

            .project-meta {
                margin-bottom: 2.5rem !important; /* 下方距離 */
            }

            /* --- 其他不變 --- */
            #info-overlay .bio-text { max-width: 100%; line-height: 1.4; }
            .overlay-wrapper { flex-direction: column; }
            .overlay-sidebar, .overlay-content { width: 100%; padding-left: 1rem; }
            .overlay-sidebar { padding-bottom: 2rem; padding-top: 5rem; }
            .cv-container { margin-top: 3.5rem; padding-right: 0; }
            .cv-container .text-columns { flex-direction: column; gap: 0.5rem; margin-bottom: 2.5rem; }
            .cv-container .text-col-left { margin-bottom: 0.25rem; }
            .cv-item { margin-bottom: 1.2rem; }
            #mobile-menu-overlay { background: white; padding: 1rem; padding-top: 5rem; box-sizing: border-box; }
            #mobile-menu-overlay .menu-content { display: flex; flex-direction: column; gap: 2rem; }
            #mobile-menu-overlay .section-title { font-size: 1.2rem; color: var(--color-caption); margin-bottom: 0.5rem; }
            #mobile-menu-overlay .menu-links a { display: block; font-size: 1.8rem; font-weight: 500; margin-bottom: 0.5rem; color: var(--color-text); }
        }
.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}