/* ================================================================
           完全独立的样式（不依赖任何外部CSS，避免被覆盖）
           ================================================================ */

        /* ---- 页面基础 ---- */
        html,
        body {
            margin: 0;
            padding: 0;
            min-height: 100vh;
            font-family: 'Inter', sans-serif;
        }

        /* ---- 全屏背景图（用 !important 确保生效） ---- */
        body {
            background-image: url('/upload/Background.jpg') !important;
            background-size: cover !important;
            background-position: center !important;
            background-repeat: no-repeat !important;
            background-attachment: fixed !important;
            position: relative !important;
        }

        /* ---- 背景遮罩 ---- */
        body::before {
            content: '' !important;
            position: fixed !important;
            inset: 0 !important;
            background: rgba(238, 242, 250, 0.78) !important;
            z-index: 0 !important;
            pointer-events: none !important;
        }

        /* ---- 所有内容在遮罩之上 ---- */
        .catalog-module, .catalog-module::before, .catalog-module::after {
            position: relative;
            z-index: 2;
        }

        /* ================================================================
           目录容器（完全独立，不依赖任何外部类）
           ================================================================ */

        .catalog-module {
            max-width: 1350px;
            margin-left: max(calc(260px + 40px), calc((100% - 1350px + 260px + 40px) / 2));
            margin-right: auto;
            padding: 118px 20px 80px 20px;
            position: relative;
            z-index: 2;
        }

        /* ---- 标题 ---- */
        .catalog-module .module-title {
            text-align: center;
            margin: 0 0 4px 0;
            font-family: 'GRIFTER', 'Inter', sans-serif;
            font-size: 36px;
            font-weight: 700;
            color: #151b31;
            line-height: 1.1;
        }
        .catalog-module .module-title .highlight {
            background: linear-gradient(135deg, #f59e7c, #e8795a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .catalog-module .module-subtitle {
            text-align: center;
            color: #4a4a5a;
            font-size: 18px;
            margin: 4px 0 40px 0;
        }

        /* ---- 卡片网格 ---- */
        .catalog-module .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        /* ---- 卡片 ---- */
        .catalog-module .catalog-card {
            width: 370px;
            max-width: 100%;
            background: rgba(255, 255, 255, 0.85) !important;
            backdrop-filter: blur(8px) !important;
            -webkit-backdrop-filter: blur(8px) !important;
            border: 2px solid rgba(255, 255, 255, 0.9) !important;
            border-radius: 24px !important;
            display: flex !important;
            flex-direction: column !important;
            position: relative !important;
            overflow: hidden !important;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05) !important;
            transition: transform 0.3s ease, box-shadow 0.3s ease !important;
        }
        .catalog-module .catalog-card:hover {
            transform: translateY(-6px) scale(1.01) !important;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.10) !important;
        }

        /* ---- 卡片顶部彩色条 ---- */
        .catalog-module .catalog-card::before {
            content: '' !important;
            position: absolute !important;
            top: 0 !important;
            left: 0 !important;
            right: 0 !important;
            height: 6px !important;
            border-radius: 24px 24px 0 0 !important;
            z-index: 1 !important;
        }
                .catalog-module .catalog-card:nth-child(1)::before {
            background: #f9b48a !important;
        }
        .catalog-module .catalog-card:nth-child(2)::before {
            background: #8cc9b0 !important;
        }
        .catalog-module .catalog-card:nth-child(3)::before {
            background: #7dd3c0 !important;
        }

        /* ---- 卡片头部（年级标签） ---- */
        .catalog-module .catalog-card-header {
            padding: 20px 24px 12px 24px !important;
            display: flex !important;
            align-items: center !important;
            justify-content: center !important;
            border-bottom: 2px dashed rgba(0, 0, 0, 0.04) !important;
        }
        .catalog-module .catalog-card:nth-child(4)::before {
            background: #d4c4b0 !important;
        }
        .catalog-module .catalog-card:nth-child(5)::before {
            background: #d4c4b0 !important;
        }
        .catalog-module .catalog-card:nth-child(6)::before {
            background: #7dd3c0 !important;
        }

        .catalog-module .grade-tag {
            font-family: 'GRIFTER', 'Inter', sans-serif !important;
            font-size: 22px !important;
            font-weight: 700 !important;
            letter-spacing: 0.02em !important;
            padding: 6px 20px !important;
            border-radius: 30px !important;
            background: #f3f4f6 !important;
            color: #374151 !important;
            border: 2px solid #e5e7eb !important;
            display: inline-flex !important;
            align-items: center !important;
            gap: 8px !important;
        }
        .catalog-module .grade-tag .version {
            font-size: 13px !important;
            font-weight: 600 !important;
            opacity: 0.6 !important;
            font-family: 'Inter', sans-serif !important;
        }

        /* 各年级标签颜色 */
        .catalog-module .catalog-card:nth-child(1) .grade-tag {
            background: #fce8da !important;
            color: #c07050 !important;
            border: 2px solid rgba(192,112,80,0.2) !important;
        }
        .catalog-module .catalog-card:nth-child(2) .grade-tag {
            background: #daf0e6 !important;
            color: #408a70 !important;
            border: 2px solid rgba(64,138,112,0.2) !important;
        }
        .catalog-module .catalog-card:nth-child(3) .grade-tag {
            background: #f0e0d6 !important;
            color: #a07050 !important;
            border: 2px solid rgba(160,112,80,0.2) !important;
        }

        /* ---- 卡片主体 ---- */
        .catalog-module .catalog-card-body {
            padding: 16px 24px 24px 24px !important;
            flex: 1 !important;
        }
        .catalog-module .catalog-card:nth-child(4) .grade-tag {
            background: #f5ebe0 !important;
            color: #8a7a6a !important;
            border: 2px solid rgba(138,122,106,0.2) !important;
        }
        .catalog-module .catalog-card:nth-child(5) .grade-tag {
            background: #f5ebe0 !important;
            color: #8a7a6a !important;
            border: 2px solid rgba(138,122,106,0.2) !important;
        }
        .catalog-module .catalog-card:nth-child(6) .grade-tag {
            background: #d1f2eb !important;
            color: #1a8a7a !important;
            border: 2px solid rgba(26,138,122,0.2) !important;
        }


        /* ---- 册次分组 ---- */
        .catalog-module .volume-group {
            margin-bottom: 16px !important;
        }
        .catalog-module .volume-group:last-child {
            margin-bottom: 0 !important;
        }

        .catalog-module .volume-label {
            font-size: 13px !important;
            font-weight: 700 !important;
            color: #8a7a6a !important;
            letter-spacing: 0.04em !important;
            text-transform: uppercase !important;
            padding-bottom: 4px !important;
            border-bottom: 2px solid rgba(0, 0, 0, 0.04) !important;
            margin-bottom: 8px !important;
            display: flex !important;
            align-items: center !important;
            gap: 8px !important;
            width: fit-content;
            padding: 5px 10px 5px 8px !important;
            border: 1px solid rgba(176, 120, 96, 0.16) !important;
            border-radius: 9px;
            background: rgba(252, 232, 218, 0.48);
        }
        .catalog-module .volume-label .volume-icon {
            display: inline-block;
            font-family: "Font Awesome 6 Free" !important;
            font-weight: 900;
            width: 16px;
            text-align: center;
            color: #b07860;
        }
        .catalog-module .volume-group + .volume-group .volume-label {
            border-color: rgba(96, 144, 160, 0.18) !important;
            background: transparent;
        }
        .catalog-module .volume-group + .volume-group .volume-icon {
            color: #6090a0;
        }

        /* ---- 目录内所有链接无下划线 ---- */
        .catalog-module a {
            text-decoration: none !important;
        }
        .catalog-module a:hover {
            text-decoration: none !important;
        }
        .catalog-module .chapter-item > a {
            display: flex;
            align-items: baseline;
            gap: 4px;
            width: 100%;
            color: inherit;
            text-decoration: none;
        }
        .catalog-module .volume-label .volume-icon.volume-icon-text {
            width: 16px;
            font-family: inherit !important;
            font-size: 14px;
            line-height: 1;
        }
        .catalog-module .volume-label .volume-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex: 0 0 19px;
            height: 19px;
        }

        /* JSON 中的本地图标使用主题图标字体，不能被册次的 Font Awesome 规则覆盖。 */
        .catalog-module .volume-label .volume-icon.mzpi-nav-icon {
            font-family: 'mzpi-nav-icons' !important;
            font-style: normal !important;
            font-weight: normal !important;
            flex-basis: 23px;
            width: 23px;
            height: 23px;
            font-size: 21px !important;
        }

        /* 册次不是独立卡片，始终直接融入年级主卡片。 */
        .catalog-module .catalog-card .volume-group,
        .catalog-module .catalog-card .grade-chapters {
            margin: 0 0 16px !important;
            max-width: 292px;
            padding: 0 !important;
            border: 0 !important;
            border-radius: 0 !important;
            background: transparent !important;
            box-shadow: none !important;
        }

        .catalog-module .catalog-card .volume-group:last-child,
        .catalog-module .catalog-card .grade-chapters:last-child {
            margin-bottom: 0 !important;
        }

        /* ---- 章节列表 ---- */
        .catalog-module .chapter-item {
            display: flex !important;
            align-items: baseline !important;
            gap: 4px !important;
            padding: 3px 0 !important;
            font-size: 14px !important;
            font-weight: 500 !important;
            line-height: 1.6 !important;
            color: #2d241e !important;
            text-decoration: none !important;
            cursor: pointer !important;
            transition: color 0.15s !important;
        }
        .catalog-module .chapter-item:hover {
            color: #e07050 !important;
        }
        .catalog-module .chapter-item .num {
            font-weight: 600 !important;
            color: #8a7a6a !important;
            flex-shrink: 0 !important;
            font-size: 13px !important;
            letter-spacing: 0.02em !important;
        }
        .catalog-module .chapter-item:hover .num {
            color: #c07050 !important;
        }
        .catalog-module .chapter-item .title {
            flex: 1 !important;
        }

        /* ---- 暗色模式 ---- */
        body.dark {
            background-image: url('/upload/Background.jpg') !important;
            background-size: cover !important;
            background-position: center !important;
            background-repeat: no-repeat !important;
            background-attachment: fixed !important;
        }
        body.dark::before {
            background: rgba(11, 17, 32, 0.78) !important;
        }
        body.dark .catalog-module .module-title {
            color: #f1f5f9 !important;
        }
        body.dark .catalog-module .module-subtitle {
            color: #94a3b8 !important;
        }
        body.dark .catalog-module .catalog-card {
            background: rgba(30, 41, 59, 0.78) !important;
            border-color: rgba(255, 255, 255, 0.06) !important;
        }
        body.dark .catalog-module .catalog-card:hover {
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3) !important;
        }
        body.dark .catalog-module .catalog-card-header {
            border-bottom-color: rgba(255, 255, 255, 0.06) !important;
        }
        body.dark .catalog-module .grade-tag {
            background: #f3f4f6 !important;
            color: #374151 !important;
            border: 2px solid #e5e7eb !important;
        }
        body.dark .catalog-module .catalog-card:nth-child(1) .grade-tag {
            background: #fce8da !important;
            color: #c07050 !important;
            border: 2px solid rgba(192,112,80,0.2) !important;
        }
        body.dark .catalog-module .catalog-card:nth-child(2) .grade-tag {
            background: #daf0e6 !important;
            color: #408a70 !important;
            border: 2px solid rgba(64,138,112,0.2) !important;
        }
        body.dark .catalog-module .catalog-card:nth-child(3) .grade-tag {
            background: #f0e0d6 !important;
            color: #a07050 !important;
            border: 2px solid rgba(160,112,80,0.2) !important;
        }
        body.dark .catalog-module .volume-label {
            color: #94a3b8 !important;
            border-bottom-color: rgba(255, 255, 255, 0.06) !important;
        }
        body.dark .catalog-module .volume-group {
            border-color: rgba(255, 255, 255, 0.08);
            background: rgba(15, 23, 42, 0.42);
        }
        body.dark .catalog-module .catalog-card:nth-child(4) .grade-tag {
            background: #f5ebe0 !important;
            color: #8a7a6a !important;
            border: 2px solid rgba(138,122,106,0.2) !important;
        }
        body.dark .catalog-module .catalog-card:nth-child(5) .grade-tag {
            background: #f5ebe0 !important;
            color: #8a7a6a !important;
            border: 2px solid rgba(138,122,106,0.2) !important;
        }
        body.dark .catalog-module .catalog-card:nth-child(6) .grade-tag {
            background: #d1f2eb !important;
            color: #1a8a7a !important;
            border: 2px solid rgba(26,138,122,0.2) !important;
        }

        body.dark .catalog-module .volume-label .arrow-up {
            border-bottom-color: #c08068 !important;
        }
        body.dark .catalog-module .volume-label .arrow-down {
            border-top-color: #70a0b0 !important;
        }
        body.dark .catalog-module .chapter-item {
            color: #e2e8f0 !important;
        }
        body.dark .catalog-module .chapter-item:hover {
            color: #60a5fa !important;
        }
        body.dark .catalog-module .chapter-item .num {
            color: #94a3b8 !important;
        }
        body.dark .catalog-module .chapter-item:hover .num {
            color: #60a5fa !important;
        }

        /* ---- 响应式 ---- */
        @media (max-width: 991px) {
            .catalog-module .catalog-card {
                width: 46% !important;
                min-width: 280px !important;
            }
            .catalog-module {
                padding: 40px 20px 60px 20px !important;
            }
        }
        @media (max-width: 767px) {
            .catalog-module .catalog-card {
                width: 100% !important;
                min-width: 0 !important;
                border-radius: 20px !important;
            }
            .catalog-module .module-title {
                font-size: 32px !important;
            }
            .catalog-module .module-subtitle {
                font-size: 16px !important;
                margin-bottom: 32px !important;
            }
            .catalog-module {
                padding: 32px 16px 48px 16px !important;
            }
            .catalog-module .grade-tag {
                font-size: 18px !important;
                padding: 4px 16px !important;
            }
            .catalog-module .grade-tag .version {
                font-size: 12px !important;
            }
            .catalog-module .catalog-card-header {
                padding: 16px 18px 10px 18px !important;
            }
            .catalog-module .catalog-card-body {
                padding: 12px 18px 18px 18px !important;
            }
            .catalog-module .chapter-item {
                font-size: 13px !important;
                padding: 2px 0 !important;
            }
            .catalog-module .chapter-item .num {
                font-size: 12px !important;
            }
        }
        @media (max-width: 479px) {
            .catalog-module .grade-tag {
                font-size: 16px !important;
                padding: 4px 14px !important;
            }
            .catalog-module .grade-tag .version {
                font-size: 11px !important;
            }
            .catalog-module .chapter-item {
                font-size: 12px !important;
                gap: 2px !important;
            }
            .catalog-module .chapter-item .num {
                font-size: 11px !important;
            }
            .catalog-module .volume-label {
                font-size: 12px !important;
            }
            .catalog-module .volume-label .arrow-up {
                border-left-width: 5px !important;
                border-right-width: 5px !important;
                border-bottom-width: 7px !important;
            }
            .catalog-module .volume-label .arrow-down {
                border-left-width: 5px !important;
                border-right-width: 5px !important;
                border-top-width: 7px !important;
            }
            .catalog-module .module-title {
                font-size: 26px !important;
            }
            .catalog-module .module-subtitle {
                font-size: 14px !important;
            }
        }
            @media (max-width: 1000px) {
            .catalog-module .card-grid {
                grid-template-columns: repeat(2, 1fr) !important;
            }
            .catalog-module {
                padding: 100px 16px 60px 16px !important;
                margin-left: 0 !important;
            }
            .catalog-module .module-title {
                font-size: 28px !important;
            }
            .catalog-module .module-subtitle {
                font-size: 16px !important;
                margin-bottom: 32px !important;
            }
        }
        @media (max-width: 600px) {
            .catalog-module .card-grid {
                grid-template-columns: 1fr !important;
            }
            .catalog-module {
                padding: 90px 12px 40px 12px !important;
            }
            .catalog-module .module-title {
                font-size: 24px !important;
            }
            .catalog-module .catalog-card-header {
                padding: 16px 16px 10px 16px !important;
            }
            .catalog-module .catalog-card-body {
                padding: 12px 16px 18px 16px !important;
            }
            .catalog-module .chapter-item {
                font-size: 13px !important;
            }
            .catalog-module .grade-tag {
                font-size: 18px !important;
                padding: 4px 16px !important;
            }
        }

        /* ---- 页面布局优化 ---- */
        .catalog-module {
            width: min(1120px, calc(100vw - 340px));
            max-width: none;
            margin-left: max(300px, calc(260px + (100vw - 260px - 1120px) / 2));
            margin-right: 0;
            padding: 112px 0 72px;
        }

        .catalog-module .card-grid {
            grid-template-columns: repeat(3, minmax(0, 1fr));
            align-items: stretch;
            gap: 24px;
        }

        .catalog-module .grade-tag i {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            margin-right: 9px;
            border-radius: 12px;
            font-size: 17px;
            opacity: 1;
            background: rgba(255, 255, 255, 0.6);
        }

        .catalog-module .grade-tag {
            display: flex !important;
            align-items: center;
            justify-content: center;
            width: 100%;
            background: transparent !important;
            border: 0 !important;
            padding: 0 !important;
            border-radius: 0 !important;
        }

        .catalog-module .grade-title {
            width: 100%;
            text-align: center;
            line-height: 1.3;
        }

        .catalog-module .grade-name {
            font-family: 'GRIFTER', 'Inter', sans-serif;
            font-size: 28px;
            font-weight: 800;
            color: #374151;
        }

        .catalog-module .grade-title .version {
            font-family: 'Inter', sans-serif;
            font-size: 13px;
            font-weight: 600;
            color: #8a7a6a;
            opacity: 0.7;
        }

        body.dark .catalog-module .grade-name {
            color: #f1f5f9;
        }

        body.dark .catalog-module .grade-title .version {
            color: #94a3b8;
        }

        .catalog-module .volume-group {
            margin-bottom: 14px !important;
            padding: 14px 16px 12px;
            border: 1px solid rgba(148, 163, 184, 0.16);
            border-radius: 14px;
            background: rgba(248, 250, 252, 0.72);
        }

        .catalog-module .volume-label {
            width: auto;
            padding: 0 0 9px !important;
            border: 0 !important;
            border-bottom: 1px solid rgba(148, 163, 184, 0.18) !important;
            border-radius: 0;
            background: transparent;
            color: #64748b !important;
            font-size: 14px !important;
            letter-spacing: 0.02em !important;
            text-transform: none !important;
        }

        .catalog-module .volume-label .volume-icon {
            width: 19px;
            color: #64748b;
            font-size: 15px;
        }

        .catalog-module .volume-group + .volume-group .volume-label,
        .catalog-module .volume-group + .volume-group .volume-icon {
            color: #64748b !important;
        }

        .catalog-module .volume-group .chapter-item:first-of-type {
            margin-top: 7px;
        }

        .catalog-module .catalog-card {
            width: auto;
            min-width: 0;
            border: 0 !important;
            border-top: 8px solid #8cc9b0 !important;
            border-radius: 24px !important;
            background: #ffffff !important;
            backdrop-filter: none !important;
            -webkit-backdrop-filter: none !important;
            box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08) !important;
        }

        .catalog-module .catalog-card:nth-child(1) {
            border-top-color: #8cb9ed !important;
        }

        .catalog-module .catalog-card:nth-child(2) {
            border-top-color: #b79bea !important;
        }

        .catalog-module .catalog-card:nth-child(3) {
            border-top-color: #f2b27f !important;
        }

        .catalog-module .catalog-card::before {
            display: none !important;
        }

        .catalog-module .catalog-card-header {
            padding: 22px 22px 16px !important;
            border-bottom: 0 !important;
            justify-content: center !important;
        }

        .catalog-module .grade-tag {
            justify-content: center;
        }

        /* 年级标题不使用标签卡片，保持为简洁的标题文本。 */
        .catalog-module .catalog-card .grade-tag {
            display: inline-flex !important;
            padding: 0 !important;
            border: 0 !important;
            border-radius: 0 !important;
            background: transparent !important;
            box-shadow: none !important;
        }

        .catalog-module .catalog-card-body {
            padding: 0 22px 22px 38px !important;
        }

        body.dark .catalog-module .catalog-card {
            background: #1e293b !important;
            border-top-color: #60a5fa !important;
        }

        body.dark .catalog-module .catalog-card:nth-child(2) {
            border-top-color: #a78bfa !important;
        }

        body.dark .catalog-module .catalog-card:nth-child(3) {
            border-top-color: #fb923c !important;
        }

        .catalog-module .catalog-card-body {
            min-height: 392px;
        }

        .catalog-module .chapter-item {
            border-radius: 8px;
            margin: 0 -8px;
            padding: 5px 8px !important;
            transition: background-color 0.18s ease, color 0.18s ease;
        }

        .catalog-module .chapter-item:hover {
            background: rgba(59, 130, 246, 0.08);
        }

        .catalog-module .chapter-item:focus-visible,
        .catalog-module .chapter-item.is-focused {
            outline: 2px solid rgba(59, 130, 246, 0.45);
            outline-offset: 2px;
            background: rgba(59, 130, 246, 0.1);
        }

        @media (max-width: 1200px) and (min-width: 1001px) {
            .catalog-module {
                width: calc(100vw - 340px);
                margin-left: 300px;
            }
            .catalog-module .card-grid {
                grid-template-columns: repeat(2, minmax(0, 1fr));
            }
        }

        @media (max-width: 1000px) {
            .catalog-module {
                width: 100%;
                margin: 0;
                padding: 92px 20px 56px;
            }
        }

        @media (max-width: 600px) {
            .catalog-module {
                padding: 88px 14px 40px;
            }
            .catalog-module .card-grid {
                gap: 16px;
            }
            .catalog-module .catalog-card {
                width: calc(100% - 40px) !important;
                margin-left: auto;
                margin-right: auto;
            }
            .catalog-module .catalog-card-body {
                min-height: 0;
            }
            .catalog-module .catalog-card-header {
                padding: 20px 18px 14px !important;
            }
            .catalog-module .catalog-card-body {
                padding: 0 18px 18px 34px !important;
            }
            .catalog-module .chapter-item {
                font-size: 15px !important;
                line-height: 1.7 !important;
            }
            .catalog-module .chapter-item .num {
                font-size: 13px !important;
            }
            .catalog-module .volume-label {
                font-size: 14px !important;
            }
        }

        /* 册次与章节直接融入年级主卡片，不再单独显示小卡片 */
        .catalog-module .volume-group {
            margin-bottom: 16px !important;
            max-width: 292px;
            padding: 0 !important;
            border: 0 !important;
            border-radius: 0 !important;
            background: transparent !important;
            box-shadow: none !important;
        }
        .catalog-module .volume-group:last-child {
            margin-bottom: 0 !important;
        }

        .catalog-module .volume-label {
            padding: 0 0 9px !important;
            border: 0 !important;
            border-bottom: 1px solid rgba(148, 163, 184, 0.24) !important;
            background: transparent !important;
            border-radius: 0 !important;
        }
        body.dark .catalog-module .volume-group,
        body.dark .catalog-module .volume-label {
            background: transparent !important;
        }
        body.dark .catalog-module .volume-label {
            border: 0 !important;
            border-bottom: 1px solid rgba(148, 163, 184, 0.18) !important;
        }
        @media (max-width: 600px) {
            .catalog-module .grade-tag {
                font-size: 16px !important;
                padding: 3px 12px !important;
            }
            .catalog-module .grade-tag .version {
                font-size: 10px !important;
            }

        }

        /* 横屏平板/大屏手机：一行完整展示三个年级卡片，避免沿用两列布局后出现大面积空白。 */
        @media (min-width: 820px) and (max-width: 1000px) and (orientation: landscape) {
            .catalog-module {
                padding: 84px 18px 36px !important;
            }

            .catalog-module .card-grid {
                grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
                gap: 16px;
                align-items: start;
            }

            .catalog-module .catalog-card {
                width: auto !important;
                min-width: 0 !important;
                margin: 0 !important;
            }

            .catalog-module .catalog-card-header {
                padding: 16px 14px 10px !important;
            }

            .catalog-module .catalog-card-body {
                min-height: 0;
                padding: 0 14px 16px 30px !important;
            }

            .catalog-module .grade-tag {
                font-size: 22px !important;
            }

            .catalog-module .grade-tag .version {
                font-size: 11px !important;
            }

            .catalog-module .volume-group {
                margin-bottom: 12px !important;
            }

            .catalog-module .volume-label {
                padding-bottom: 7px !important;
                font-size: 13px !important;
            }

            .catalog-module .chapter-item {
                margin: 0 -4px;
                padding: 4px !important;
                font-size: 13px !important;
                line-height: 1.45;
            }

            .catalog-module .chapter-item .num {
                font-size: 12px !important;
            }
        }

        /* 最终覆盖旧版年级彩色标签规则，年级标题保持纯文本显示。 */
        .catalog-module .card-grid > .catalog-card:nth-child(n) > .catalog-card-header > .grade-tag {
            padding: 0 !important;
            border: 0 !important;
            border-radius: 0 !important;
            background: transparent !important;
            box-shadow: none !important;
            color: #374151 !important;
        }

        .catalog-module .card-grid > .catalog-card:nth-child(n) > .catalog-card-header > .grade-tag .grade-name {
            color: #374151 !important;
        }

        .catalog-module .card-grid > .catalog-card:nth-child(n) > .catalog-card-header > .grade-tag .version {
            color: #8a7a6a !important;
        }

        body.dark .catalog-module .card-grid > .catalog-card:nth-child(n) > .catalog-card-header > .grade-tag,
        body.dark .catalog-module .card-grid > .catalog-card:nth-child(n) > .catalog-card-header > .grade-tag .grade-name {
            color: #f1f5f9 !important;
        }

        body.dark .catalog-module .card-grid > .catalog-card:nth-child(n) > .catalog-card-header > .grade-tag .version {
            color: #94a3b8 !important;
        }