:root {
            /* N-Performance 賽道主題 x 超感玻璃配色 */
            --bg-main: #06090F;
            /* 極致深邃黑 */
            --glass-bg: rgba(22, 27, 34, 0.65);
            /* 玻璃基底 */
            --glass-border: rgba(255, 255, 255, 0.12);
            /* 玻璃邊緣 */
            --text-primary: #F0F6FC;
            --text-secondary: #8B949E;
            --text-muted: #475569;

            /* 賽道霓虹點綴色 */
            --accent-blue: #00A2FF;
            /* 性能藍 */
            --accent-red: #FF3366;
            /* 賽道紅 (維修/警告) */
            --accent-green: #00E676;
            /* 螢光綠 (定保/正常) */
            --accent-orange: #FF9100;
            --accent-purple: #B388FF;

            /* 光線反射漸層與陰影 */
            --reflection: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0) 40%, rgba(255, 255, 255, 0) 60%, rgba(255, 255, 255, 0.05) 100%);
            --shadow-sm: 0 8px 32px rgba(0, 0, 0, 0.6);
            --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

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

        body {
            /* 這裡加入了性能藍與賽道紅的強烈氛圍光暈 */
            background:
                radial-gradient(circle at 15% 20%, rgba(0, 162, 255, 0.4) 0%, transparent 40%),
                radial-gradient(circle at 85% 80%, rgba(255, 51, 102, 0.25) 0%, transparent 40%),
                radial-gradient(circle at 50% 50%, rgba(179, 136, 255, 0.1) 0%, transparent 60%),
                var(--bg-main);
            background-attachment: fixed;
            /* 讓背景固定，滑動時玻璃透視感更明顯 */

            color: var(--text-primary);
            font-family: 'Inter', 'Noto Sans TC', sans-serif;
            -webkit-font-smoothing: antialiased;
            padding: 100px 0 40px;
        }

        .num {
            font-family: 'Inter', sans-serif;
        }

        /* 1. 更新原有的 .app-container (加上定位與 z-index 建立圖層) */
        .app-container {
            max-width: 480px;
            margin: 0 auto;
            padding: 10px 16px;
            position: relative;
            /* 新增這行 */
            z-index: 1;
            /* 新增這行 */
        }

        /* 2. 新增專屬 HYUNDAI ELANTRA 浮水印 */
        .app-container::before {
            content: "HYUNDAI ELANTRA";
            position: fixed;
            /* 固定在畫面正中央，滑動時才有透視感 */
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) rotate(-15deg);
            /* 微傾斜帶出賽道動感 */
            font-size: clamp(60px, 15vw, 120px);
            /* 響應式超大字體 */
            font-weight: 900;
            font-style: italic;
            /* 速度感斜體 */
            color: transparent;
            /* 字體本體透明 */
            -webkit-text-stroke: 2px rgba(255, 255, 255, 0.04);
            /* 極細微的玻璃描邊反光 */
            white-space: nowrap;

            /* 👇 這兩行是「不影響功能」的絕對關鍵 */
            pointer-events: none;
            /* 讓滑鼠/手指點擊完全穿透，不阻礙任何按鈕操作 */
            user-select: none;
            /* 禁止游標反白選取文字 */

            z-index: -1;
            /* 藏在卡片後面，但浮在背景光暈前面 */
            letter-spacing: 5px;
        }

        /* 🏆 懸浮式動態島導覽列 (Dynamic Island Style) */
        .top-nav {
            position: fixed;
            top: 16px;
            left: 50%;
            transform: translateX(-50%);
            width: calc(100% - 32px);
            max-width: 448px;
            height: 65px;
            background: rgba(13, 17, 23, 0.75);
            backdrop-filter: blur(20px);
            /* 磨砂玻璃效果 */
            -webkit-backdrop-filter: blur(20px);
            z-index: 1000;
            display: flex;
            justify-content: space-around;
            align-items: center;
            border-radius: 20px;
            border: 1px solid var(--glass-border);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.6), inset 0 1px 1px rgba(255, 255, 255, 0.1);
        }

        .nav-item {
            text-decoration: none;
            color: var(--text-muted);
            font-size: 11px;
            font-weight: 600;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            padding: 8px 0;
            cursor: pointer;
            width: 25%;
            transition: var(--transition-smooth);
        }

        .nav-item i {
            font-size: 20px;
            transition: transform 0.2s;
        }

        .nav-item.active {
            color: var(--accent-blue);
            text-shadow: 0 0 12px rgba(0, 162, 255, 0.6);
        }

        .nav-item.active i {
            transform: translateY(-2px);
        }

        /* 儀表板 Hero Section */
        .hero-section {
            text-align: center;
            padding: 10px 0 30px;
        }

        .hero-title {
            font-size: 13px;
            color: var(--text-secondary);
            font-weight: 600;
            margin-bottom: 8px;
            letter-spacing: 1px;
        }

        .hero-amount {
            font-size: 52px;
            font-weight: 900;
            color: #FFF;
            margin-bottom: 20px;
            display: flex;
            justify-content: center;
            align-items: baseline;
            gap: 4px;
            letter-spacing: -1px;
            text-shadow: 0 0 15px rgba(0, 162, 255, 0.5), 0 0 30px rgba(0, 162, 255, 0.2);
            /* 數字霓虹發光 */
        }

        .hero-amount .unit {
            font-size: 16px;
            color: var(--accent-blue);
            font-weight: 600;
            text-shadow: none;
            letter-spacing: 0;
        }

        .hero-sub-info {
            display: flex;
            justify-content: center;
            gap: 30px;
            font-size: 13px;
            background: var(--glass-bg);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            padding: 16px;
            border-radius: 16px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--glass-border);
        }

        .hero-sub-info div {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .hero-sub-info span {
            color: var(--text-secondary);
            margin-bottom: 4px;
            font-size: 11px;
        }

        .hero-sub-info strong {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
        }

        /* ✨ 極致玻璃卡片設計 (核心光影反射) */
        .card {
            position: relative;
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-radius: 20px;
            padding: 20px;
            margin-bottom: 16px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.08);
            /* 外部陰影與內部邊緣高光 */
            border: 1px solid var(--glass-border);
            transition: transform 0.2s ease;
            overflow: hidden;
            /* 確保光線反射層不溢出圓角 */
        }

        /* 光線反射偽元素 */
        .card::after {
            content: "";
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: var(--reflection);
            transform: rotate(0deg);
            pointer-events: none;
            /* 確保不影響點擊 */
            z-index: 0;
        }

        /* 確保卡片內容在反射層之上 */
        .card>* {
            position: relative;
            z-index: 1;
        }

        .card:active {
            transform: scale(0.98);
        }

        .card-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .card-title {
            font-size: 16px;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-primary);
        }

        .card-subtitle {
            font-size: 13px;
            color: var(--text-secondary);
            font-weight: 500;
            margin-top: 4px;
        }

        /* 列表項目 */
        .list-item {
            display: flex;
            justify-content: space-between;
            padding: 12px 0;
            font-size: 14px;
            align-items: center;
            border-bottom: 1px solid rgba(255, 255, 255, 0.03);
        }

        .list-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .item-main {
            font-weight: 600;
            color: var(--text-primary);
            display: block;
            margin-bottom: 4px;
        }

        .item-sub {
            font-size: 12px;
            color: var(--text-secondary);
            display: block;
        }

        .item-value {
            font-weight: 600;
            color: var(--text-primary);
            text-align: right;
        }

        /* 螢光狀態標籤 */
        .tag {
            position: relative;
            z-index: 1;
            font-size: 11px;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 20px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .tag-maintain {
            background: rgba(0, 230, 118, 0.15);
            color: var(--accent-green);
            border: 1px solid rgba(0, 230, 118, 0.3);
        }

        .tag-repair {
            background: rgba(255, 51, 102, 0.15);
            color: var(--accent-red);
            border: 1px solid rgba(255, 51, 102, 0.3);
        }

        .tag-upgrade {
            background: rgba(179, 136, 255, 0.15);
            color: var(--accent-purple);
            border: 1px solid rgba(179, 136, 255, 0.3);
        }

        /* 圖表容器 */
        .chart-container {
            position: relative;
            height: 220px;
            width: 100%;
            margin-top: 10px;
            z-index: 1;
        }

        /* 按鈕風格 */
        .btn-history,
        .btn-manual {
            width: 100%;
            padding: 16px;
            border-radius: 16px;
            background: var(--glass-bg);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            color: var(--text-primary);
            border: 1px solid var(--glass-border);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
            margin-bottom: 16px;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        }

        .btn-history:hover,
        .btn-manual:hover {
            border-color: var(--accent-blue);
            box-shadow: 0 0 15px rgba(0, 162, 255, 0.2);
        }

        .query-input {
            width: 100%;
            border: 1px solid var(--glass-border);
            border-radius: 12px;
            padding: 14px 16px;
            font-size: 16px;
            background: rgba(0, 0, 0, 0.4);
            color: white;
            outline: none;
            transition: 0.3s;
            position: relative;
            z-index: 1;
        }

        .query-input:focus {
            border-color: var(--accent-blue);
            box-shadow: 0 0 0 3px rgba(0, 162, 255, 0.2);
            background: rgba(0, 0, 0, 0.6);
        }

        .btn-primary {
            background: linear-gradient(135deg, #00A2FF, #0055FF);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 14px;
            font-weight: 600;
            padding: 0 24px;
            cursor: pointer;
            transition: 0.2s;
            white-space: nowrap;
            box-shadow: 0 4px 15px rgba(0, 162, 255, 0.4);
            position: relative;
            z-index: 1;
        }

        .btn-primary:active {
            transform: scale(0.95);
        }

        /* 保養手冊表格 (暗黑玻璃版) */
        .manual-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            margin-top: 16px;
            font-size: 12px;
            border-radius: 8px;
            overflow: hidden;
            border: 1px solid var(--glass-border);
            position: relative;
            z-index: 1;
        }

        .manual-table th,
        .manual-table td {
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            border-right: 1px solid rgba(255, 255, 255, 0.05);
            padding: 12px 6px;
            text-align: center;
        }

        .manual-table th {
            background: rgba(13, 17, 23, 0.9);
            color: var(--text-secondary);
            font-weight: 600;
            position: sticky;
            top: 0;
            z-index: 10;
            backdrop-filter: blur(5px);
        }

        .manual-table td.item-name {
            text-align: left;
            font-weight: 600;
            color: var(--text-primary);
            min-width: 90px;
            background: rgba(255, 255, 255, 0.02);
        }

        .mark-r {
            color: var(--accent-red);
            font-weight: 800;
            font-size: 14px;
            text-shadow: 0 0 8px rgba(255, 51, 102, 0.4);
        }

        .mark-i {
            color: var(--accent-blue);
            font-weight: 800;
            font-size: 14px;
        }

        /* 隱藏功能類別 */
        .hide {
            display: none !important;
        }

        /* 🏆 全視窗半透明化統一設定 */
        /* 將所有具備容器性質的元件一併處理 */
        .card,
        .hero-sub-info,
        .top-nav,
        .btn-manual,
        .btn-history,
        .manual-table,
        #query-result {
            background: var(--glass-bg) !important;
            /* 使用統一的半透明基底 */
            backdrop-filter: blur(25px) saturate(180%);
            /* 增加模糊度與飽和度，玻璃質感更厚實 */
            -webkit-backdrop-filter: blur(25px) saturate(180%);
            border: 1px solid var(--glass-border) !important;
            box-shadow:
                0 10px 30px rgba(0, 0, 0, 0.5),
                inset 0 1px 1px rgba(255, 255, 255, 0.1) !important;
            color: var(--text-primary);
        }

        /* 強化按鈕與卡片的互動感：滑過時玻璃變亮 */
        .card:hover,
        .btn-manual:hover,
        .btn-history:hover {
            background: rgba(255, 255, 255, 0.08) !important;
            border-color: rgba(0, 162, 255, 0.4) !important;
            box-shadow: 0 0 20px rgba(0, 162, 255, 0.2) !important;
            transform: translateY(-2px);
            transition: var(--transition-smooth);
        }

        /* 特別處理保養手冊表格的標題頭，讓它在滾動時也有透明質感 */
        .manual-table th {
            background: rgba(22, 27, 34, 0.9) !important;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }

        /* 特別處理輸入框，讓它跟整體 OS 風格融合 */
        .query-input {
            background: rgba(0, 0, 0, 0.4) !important;
            backdrop-filter: blur(10px);
            border: 1px solid var(--glass-border);
        }

        /* 確保所有卡片內的裝飾性背景色(如 remark 區塊)也變透明 */
        div[style*="background: #F9FAFB"],
        div[style*="background: var(--bg-main)"] {
            background: rgba(255, 255, 255, 0.03) !important;
            border: 1px solid rgba(255, 255, 255, 0.05);
        }