* {
            box-sizing: border-box;
            font-family: 'Segoe UI', Roboto, 'Microsoft YaHei', sans-serif;
        }
        body {
            background: #f0f4f9;
            margin: 20px;
            display: flex;
            justify-content: center;
        }
        .container {
            max-width: 98vw;
            width: 100%;
            background: #ffffff;
            border-radius: 18px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.07);
            padding: 30px 35px;
            overflow-x: hidden;
        }
        h1 {
            font-size: 32px;
            font-family: 'Georgia', 'Times New Roman', serif;
            color: #1a2639;
            margin: 0 0 6px 0;
            text-align: center;
            letter-spacing: 2px;
            border-bottom: 3px solid #4a90d9;
            padding-bottom: 12px;
            width: 80%;
            margin-left: auto;
            margin-right: auto;
        }
        .subtitle {
            color: #2c3e50;
            font-size: 15px;
            margin-bottom: 25px;
            padding: 14px 20px;
            background: #f0f6fd;
            border-radius: 8px;
            line-height: 1.8;
            text-align: center;
        }
        .subtitle .source {
            font-weight: 500;
            color: #1a3a5a;
        }
        .subtitle .source span {
            background: #e6edf6;
            padding: 2px 12px;
            border-radius: 30px;
            font-weight: 600;
            color: #004080;
        }
        .upload-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }
        .upload-card {
            background: #f9fbfd;
            border: 2px dashed #d6e0ea;
            border-radius: 14px;
            padding: 22px 18px;
            text-align: center;
            transition: 0.3s;
            cursor: pointer;
        }
        .upload-card.has-file {
            border-color: #28a745;
            background: #eafaf1;
        }
        .upload-card.has-file .file-status {
            background: #28a745;
            color: #fff;
        }
        .upload-card:hover {
            border-color: #4a90d9;
            background: #f2f8ff;
        }
        .upload-card .label {
            font-weight: 600;
            color: #1f2a3a;
            font-size: 16px;
        }
        .upload-card .hint {
            color: #8a9aa8;
            font-size: 13px;
            margin-top: 4px;
        }
        .upload-card input[type="file"] {
            display: none;
        }
        .upload-card .file-status {
            margin-top: 12px;
            font-size: 14px;
            background: #eef2f6;
            padding: 6px 14px;
            border-radius: 30px;
            display: inline-block;
            color: #8a9aa8;
        }
        .control-area {
            background: #f9fbfd;
            border-radius: 12px;
            padding: 16px 22px;
            margin: 12px 0 18px 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 10px 20px;
            border: 1px solid #dce3ec;
        }
        .control-area .info-group {
            display: flex;
            flex-wrap: wrap;
            gap: 20px 40px;
            font-size: 14px;
            color: #1f2a3a;
        }
        .control-area .info-group strong {
            color: #0b1a2b;
        }
        .control-area .info-group .status-ok {
            color: #28a745;
            font-weight: 600;
        }
        .control-area .layer-group {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }
        .control-area .layer-group label {
            font-weight: 600;
            color: #1f2a3a;
            font-size: 15px;
        }
        .control-area .layer-group input {
            padding: 6px 12px;
            border: 1px solid #c8d6e5;
            border-radius: 30px;
            font-size: 15px;
            width: 80px;
            text-align: center;
        }
        .control-area .layer-group .suggest {
            color: #3a6a8a;
            background: #e6edf6;
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 14px;
        }
        .control-area .layer-group .suggest span {
            font-weight: 700;
            color: #1a4a7a;
        }
        .btn-primary {
            background: #4a90d9;
            color: #fff;
            border: none;
            padding: 14px 38px;
            border-radius: 40px;
            font-size: 17px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
            width: 100%;
            margin-top: 6px;
        }
        .btn-primary:hover {
            background: #3a78c0;
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(74, 144, 217, 0.3);
        }
        .btn-primary:disabled {
            opacity: 0.5;
            pointer-events: none;
            transform: none;
        }
        .btn-success {
            background: #28a745;
            color: #fff;
            border: none;
            padding: 12px 32px;
            border-radius: 40px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
        }
        .btn-success:hover {
            background: #218838;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
        }
        .btn-outline {
            background: transparent;
            color: #4a6a8a;
            border: 1.5px solid #c8d6e5;
            padding: 12px 32px;
            border-radius: 40px;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: 0.2s;
        }
        .btn-outline:hover {
            background: #f0f4fa;
            border-color: #8aa3c0;
        }
        .btn-sm {
            padding: 5px 14px;
            font-size: 13px;
            border-radius: 30px;
            border: 1px solid #c8d6e5;
            background: #f8fafc;
            cursor: pointer;
            transition: 0.2s;
        }
        .btn-sm:hover {
            background: #e6edf6;
        }
        .btn-sm.active {
            background: #4a90d9;
            color: #fff;
            border-color: #4a90d9;
        }
        .action-row {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-top: 16px;
            justify-content: center;
        }
        .action-row .btn-success,
        .action-row .btn-outline {
            flex: 1;
            min-width: 160px;
            text-align: center;
        }
        .result-area,
        .regression-area,
        .class-stats-area {
            border: 1px solid #dce3ec;
            border-radius: 14px;
            padding: 18px 20px 20px 20px;
            margin-top: 25px;
            background: #ffffff;
        }
        .result-area {
            margin-top: 28px;
            display: none;
        }
        .result-area .headline {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            margin-bottom: 12px;
        }
        .result-area .headline h3 {
            margin: 0;
            color: #1a2639;
            font-weight: 600;
            font-size: 18px;
        }
        .filter-row {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px 12px;
            margin-bottom: 8px;
        }
        .filter-row .filter-label {
            font-weight: 600;
            color: #1f2a3a;
            font-size: 14px;
            min-width: 60px;
        }
        .filter-row .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .filter-row .btn-group .btn-sm {
            padding: 4px 14px;
        }
        .filter-row .btn-group .btn-sm.active {
            background: #4a90d9;
            color: #fff;
            border-color: #4a90d9;
        }
        .filter-row .download-wrap {
            margin-left: auto;
        }
        .table-wrap {
            overflow-x: auto;
            border-radius: 12px;
            border: 1px solid #e2e8f0;
            max-height: 600px;
            overflow-y: auto;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 12px;
            table-layout: fixed;
            min-width: 1000px;
        }
        th, td {
            padding: 6px 4px;
            text-align: center;
            border-bottom: 1px solid #eaedf2;
            word-wrap: break-word;
            overflow-wrap: break-word;
            white-space: normal;
            line-height: 1.3;
        }
        th {
            background: #f1f6fb;
            color: #1a2a3a;
            font-weight: 600;
            border-bottom: 2px solid #d0d9e4;
            position: sticky;
            top: 0;
            z-index: 2;
        }
        tr:hover td {
            background: #f8fafd;
        }
        .col-id { width: 6%; }
        .col-name { width: 8%; }
        .col-class { width: 6%; }
        .col-raw { width: 6%; }
        .col-rank { width: 6%; }
        .col-percentile { width: 8%; }
        .col-std { width: 8%; }
        .col-layer { width: 7%; }
        .col-pred { width: 8%; }
        .col-residual { width: 8%; }
        .col-residstd { width: 8%; }
        .col-tvalue { width: 7%; }
        .col-flag { width: 4%; }
        .log-box {
            background: #1e293b;
            color: #b9c9e0;
            padding: 12px 18px;
            border-radius: 10px;
            font-family: 'Consolas', 'Monaco', monospace;
            font-size: 12px;
            margin-top: 16px;
            max-height: 110px;
            overflow-y: auto;
            white-space: pre-wrap;
            line-height: 1.6;
        }
        .log-box .ok { color: #7ddfb0; }
        .log-box .err { color: #f79b9b; }
        .regression-area {
            display: none;
        }
        .regression-area h4 {
            margin: 0 0 12px 0;
            color: #1a2639;
        }
        .regression-formula {
            background: #f8fafc;
            padding: 12px 20px;
            border-radius: 8px;
            font-size: 16px;
            display: inline-block;
            margin-bottom: 15px;
            border: 1px solid #dce3ec;
        }
        .regression-formula code {
            font-weight: 600;
            color: #0b1a2b;
        }
        .plot-container {
            width: 100%;
            height: 500px;
            border-radius: 12px;
            border: 1px solid #e2e8f0;
            background: #fafcfe;
            margin: 0 auto;
        }
        .class-stats-area {
            display: none;
        }
        .class-stats-area h4 {
            margin: 0 0 12px 0;
            color: #1a2639;
        }
        .class-stats-area .table-wrap {
            max-height: 400px;
        }
        .class-stats-area table {
            min-width: 800px;
            table-layout: fixed;
        }
        .class-stats-area th, .class-stats-area td {
            padding: 6px 8px;
        }
        .footer {
            margin-top: 28px;
            font-size: 13px;
            color: #7a8a9b;
            text-align: center;
            border-top: 1px solid #e2e8f0;
            padding-top: 18px;
        }
        @media (max-width: 680px) {
            .upload-grid { grid-template-columns: 1fr; }
            .container { padding: 18px; }
            .action-row .btn-success,
            .action-row .btn-outline { min-width: 120px; }
            .control-area { flex-direction: column; align-items: stretch; }
            .control-area .layer-group { justify-content: center; }
            .plot-container { height: 350px; }
            .filter-row { flex-direction: column; align-items: stretch; }
            .filter-row .download-wrap { margin-left: 0; }
            h1 { font-size: 24px; width: 100%; }
        }

        /* ===== 缺失数据提醒弹窗 ===== */
        .modal-overlay {
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.55);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1000;
            padding: 20px;
        }
        .modal-box {
            background: #ffffff;
            border-radius: 16px;
            max-width: 640px;
            width: 100%;
            max-height: 82vh;
            display: flex;
            flex-direction: column;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
            overflow: hidden;
        }
        .modal-head {
            padding: 18px 24px;
            font-size: 18px;
            font-weight: 700;
            color: #1a2639;
            border-bottom: 1px solid #e2e8f0;
            background: #f7fafd;
        }
        .modal-body {
            padding: 16px 24px;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }
        .modal-summary {
            margin: 0 0 14px 0;
            line-height: 1.7;
            color: #33415c;
            font-size: 15px;
        }
        .modal-summary strong {
            color: #004080;
        }
        .modal-list-wrap {
            overflow-y: auto;
            max-height: 40vh;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
        }
        .modal-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 13px;
            min-width: 0;
        }
        .modal-table th:first-child {
            width: 38%;
        }
        .modal-table th:nth-child(2) {
            width: 28%;
        }
        .modal-table th,
        .modal-table td {
            padding: 7px 14px;
            text-align: left;
            border-bottom: 1px solid #eaedf2;
            white-space: nowrap;
        }
        .modal-table th {
            background: #f1f6fb;
            color: #1a2a3a;
            position: sticky;
            top: 0;
            z-index: 1;
        }
        .modal-table tbody tr:last-child td {
            border-bottom: none;
        }
        .modal-table tr:hover td {
            background: #f8fafd;
        }
        .modal-foot {
            padding: 14px 24px;
            border-top: 1px solid #e2e8f0;
            display: flex;
            justify-content: flex-end;
            gap: 12px;
            background: #fbfcfe;
        }
        .modal-foot .btn-sm {
            padding: 8px 22px;
            font-size: 14px;
        }

        /* ===== 结果表格重点列着色 ===== */
        .cell-green {
            color: #28a745;
            font-weight: 700;
        }
        .cell-red {
            color: #e74c3c;
            font-weight: 700;
        }
        .cell-muted {
            color: #c0c8d0;
            font-weight: 400;
        }

        /* ===== 视图切换卡片（横排） ===== */
        .view-cards {
            display: flex;
            gap: 12px;
            margin-top: 25px;
            overflow-x: auto;
            padding-bottom: 4px;
        }
        .view-card {
            flex: 1;
            min-width: 180px;
            padding: 14px 18px;
            border: 1.5px solid #dce3ec;
            border-radius: 14px;
            background: #f9fbfd;
            cursor: pointer;
            font-size: 15px;
            font-weight: 600;
            color: #4a6a8a;
            text-align: center;
            transition: 0.2s;
            white-space: nowrap;
        }
        .view-card:hover {
            border-color: #4a90d9;
            background: #f2f8ff;
        }
        .view-card.active {
            background: #4a90d9;
            color: #fff;
            border-color: #4a90d9;
            box-shadow: 0 4px 14px rgba(74, 144, 217, 0.3);
        }

        /* ===== 班级统计标题行（下载按钮右上角） ===== */
        .class-stats-head {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 12px;
        }
        .class-stats-head h4 {
            margin: 0;
            color: #1a2639;
        }

        /* ===== 学科选择栏（独立于各视图，居中显示，与日志拉开距离） ===== */
        #subjectRow {
            justify-content: center;
            margin-top: 22px;
            margin-bottom: 6px;
        }
        #subjectRow .filter-label {
            min-width: auto;
        }

        /* ===== 学科按钮（区别于班级按钮，更醒目的样式） ===== */
        .subject-btn {
            padding: 8px 18px;
            border: 1.5px solid #bcd4ec;
            border-radius: 30px;
            background: #f2f8ff;
            color: #2a6fb0;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
            letter-spacing: 0.5px;
        }
        .subject-btn:hover {
            background: #e3effc;
            border-color: #4a90d9;
            transform: translateY(-1px);
        }
        .subject-btn.active {
            background: linear-gradient(135deg, #4a90d9, #2f6db5);
            color: #fff;
            border-color: #4a90d9;
            box-shadow: 0 3px 10px rgba(74, 144, 217, 0.35);
        }

        /* ===== 标题图标 ===== */
        h1 .title-icon {
            width: 34px;
            height: 34px;
            vertical-align: -6px;
            margin-right: 2px;
        }

        /* ===== 重新上传按钮图标 ===== */
        .btn-outline .reset-icon {
            width: 17px;
            height: 17px;
            vertical-align: -3px;
            margin-right: 3px;
        }

        /* ===== 对勾图标（替换 ✅） ===== */
        .check-icon {
            width: 14px;
            height: 14px;
            vertical-align: -2px;
            display: inline-block;
        }

        /* ===== 班级筛选图标 ===== */
        .filter-row .class-icon {
            width: 17px;
            height: 17px;
            vertical-align: -3px;
            margin-right: 3px;
        }

        /* ===== 班级筛选行：按钮对齐 label 右侧，换行不越界 ===== */
        .filter-row.class-filter {
            display: grid;
            grid-template-columns: auto 1fr;
            align-items: start;
            gap: 8px 12px;
        }
        .filter-row.class-filter .filter-label {
            padding-top: 5px;
        }
        .filter-row.class-filter .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            align-content: flex-start;
        }

        /* ===== 排序筛选图标 ===== */
        .filter-row .sort-icon {
            width: 17px;
            height: 17px;
            vertical-align: -3px;
            margin-right: 3px;
        }

        /* ===== 学科筛选图标 ===== */
        .filter-row .subject-icon {
            width: 17px;
            height: 17px;
            vertical-align: -3px;
            margin-right: 3px;
        }

        /* ===== 上传卡片文件夹图标 ===== */
        .upload-card .folder-icon {
            width: 22px;
            height: 22px;
            vertical-align: -4px;
            margin-right: 4px;
        }

        /* ===== 开始分析按钮图标 ===== */
        .btn-primary .analyze-icon {
            width: 22px;
            height: 22px;
            vertical-align: -4px;
            margin-right: 5px;
        }