/* General Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0 auto;
    padding: 20px;
    max-width: 1300px;
    width: 95%;
    background-color: #f7f9fc;
    color: #333;
    line-height: 1.6;
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 25px;
    font-weight: 600;
    font-size: 2.2em;
    padding-bottom: 15px;
    border-bottom: 1px solid #e9ecef;
}

/* 打印标题样式 */
#print-title {
    display: none;
    font-size: 12pt;
    text-align: center;
    margin-bottom: 15px;
}

/* 在网页上完全隐藏打印标题 */
body:not(.print-preview-mode) #print-title {
    display: none !important;
}

/* 打印相关类 */
.no-print {
    display: block;
}

.print-only {
    display: none;
}

/* 打印模式下的标题样式 */
@media print {
    body {
        background-color: #fff !important;
        margin: 0 !important;
        padding: 0 !important;
        font-family: 'Times New Roman', Times, serif !important;
        font-size: 12pt !important;
        color: #000 !important;
        width: 100% !important;
        max-width: none !important;
    }

    .no-print {
        display: none !important;
    }
    
    .print-only {
        display: block !important;
    }
    
    /* 打印标题样式 */
    #print-title {
        display: block !important;
        font-size: 10pt !important;
        text-align: center !important;
        margin: 0 0 20px 0 !important;
        padding: 0 !important;
        font-weight: normal !important;
    }
    
    /* 定义打印区域布局 */
    .container,
    .content-wrapper,
    .content-area,
    .print-section {
        box-shadow: none !important;
        border-radius: 0 !important;
        padding: 0 !important;
        margin: 0 !important;
        max-width: 100% !important;
        width: 100% !important;
        border: none !important;
        background-color: transparent !important;
        flex: none !important;
        display: block !important;
    }

    /* 移除打印区域标题 */
    .print-section h2 {
        display: none !important;
    }

    /* 打印区域网格布局 */
    #print-area.problems-sheet {
        border: none !important;
        display: grid !important;
        grid-template-columns: repeat(4, 1fr) !important;
        gap: 12mm 15mm !important;
        padding: 0 !important;
        background-color: transparent !important;
        width: 100% !important;
        max-width: 100% !important;
        margin: 0 auto !important;
    }

    /* 在打印预览模式中应用特定列设置 */
    body.col-3 #print-area.problems-sheet,
    body.print-preview-mode.col-3 #print-area.problems-sheet {
        grid-template-columns: repeat(3, 1fr) !important;
    }
    
    body.col-5 #print-area.problems-sheet,
    body.print-preview-mode.col-5 #print-area.problems-sheet {
        grid-template-columns: repeat(5, 1fr) !important;
    }
    
    /* 题目项样式 */
    .problem-item {
        border: none !important;
        background-color: transparent !important;
        box-shadow: none !important;
        padding: 0 !important;
        font-size: 16pt !important;
        font-weight: 500 !important;
        break-inside: avoid !important;
        page-break-inside: avoid !important;
        cursor: default !important;
        display: inline-block !important;
        text-align: center !important;
        min-height: auto !important;
        box-sizing: border-box !important;
        margin-bottom: 0 !important;
        white-space: nowrap !important;
        position: relative !important;
        width: 100% !important;
    }

    /* 字体大小设置 */
    body.font-large .problem-item,
    body.print-preview-mode.font-large .problem-item {
        font-size: 18pt !important;
    }
    
    body.font-small .problem-item,
    body.print-preview-mode.font-small .problem-item {
        font-size: 14pt !important;
    }

    /* 移除悬停效果 */
    .problem-item:hover {
        transform: none !important;
        box-shadow: none !important;
        border: none !important;
    }

    .problem-item.selected {
        background-color: transparent !important;
        border: none !important;
        box-shadow: none !important;
    }

    /* 答案显示逻辑 */
    .problem-item .answer {
        display: none !important;
    }

    body.print-with-answers #print-area .problem-item .answer,
    body.print-with-answers.print-preview-mode #print-area .problem-item .answer {
        display: inline !important;
        visibility: visible !important;
        height: auto !important;
        margin-left: 5mm !important;
        font-weight: normal !important;
        font-size: 14pt !important;
        color: #000 !important;
    }
    
    /* 答案字体大小设置 */
    body.font-large.print-with-answers #print-area .problem-item .answer,
    body.print-preview-mode.font-large.print-with-answers #print-area .problem-item .answer {
        font-size: 16pt !important;
    }
    
    body.font-small.print-with-answers #print-area .problem-item .answer,
    body.print-preview-mode.font-small.print-with-answers #print-area .problem-item .answer {
        font-size: 12pt !important;
    }
    
    /* 页面设置 */
    @page {
        size: A4 !important;
        margin: 20mm 15mm !important;
    }

    /* 5列模式下的页面设置 */
    body.col-5 {
        @page {
            margin: 15mm 10mm !important;
        }
    }
    
    /* 在5列模式下优化页边距 */
    body.col-5 {
        margin: 0 !important; /* 移除额外的边距 */
    }
    
    /* 打印区域网格在5列模式下的优化 */
    body.col-5 #print-area.problems-sheet {
        grid-template-columns: repeat(5, 1fr) !important;
        gap: 7mm 6mm !important; /* 5列模式下显著减小间距 */
        padding: 0 !important;
        margin: 0 auto !important;
        width: 100% !important;
    }
    
    /* 确保打印时算式文字不会溢出 */
    body.col-5 .problem-item {
        overflow: visible !important;
        white-space: nowrap !important;
        max-width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
        font-size: 13pt !important; /* 5列模式下默认字体更小 */
    }
    
    /* 5列模式下的答案样式 */
    body.col-5.print-with-answers #print-area .problem-item .answer {
        margin-left: 2mm !important; /* 减小答案的左边距 */
        font-size: 11pt !important; /* 更小的答案字体 */
    }
}

/* 打印预览模式 */
.print-preview-mode .content-wrapper {
    background-color: #e9ecef;
    padding: 20px;
    border-radius: 10px;
    overflow: hidden;
}

/* 打印预览模式下的元素显示规则 */
.print-preview-mode .print-only {
    display: block;
}

/* 打印预览模式下的标题样式 */
.print-preview-mode #print-title {
    display: block;
    max-width: 210mm;
    margin: 0 auto 20px;
    padding: 0;
    font-size: 10pt;
    text-align: center;
    font-weight: normal;
}

.print-preview-mode .print-section {
    background-color: white;
    box-shadow: 0 0 20px rgba(0,0,0,0.15);
    max-width: 210mm;
    margin: 0 auto;
    padding: 20mm 15mm;
    border: 1px solid #ddd;
}

.print-preview-mode .print-section h2 {
    display: none;
}

.print-preview-mode #print-area.problems-sheet {
    border: none;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12mm 15mm;
    padding: 0;
    background-color: transparent;
    width: auto;
    margin: 0 auto;
}

.print-preview-mode .problem-item {
    border: none;
    background-color: transparent;
    box-shadow: none;
    padding: 0;
    font-size: 16pt;
    font-weight: 500;
    display: inline-block;
    text-align: center;
    min-height: auto;
    margin-bottom: 0;
    position: relative;
    white-space: nowrap;
    width: 100%;
}

.print-preview-mode .problem-item .answer {
    display: none;
    margin-left: 5mm;
    font-weight: normal;
    font-size: 14pt;
    color: #000;
}

body.print-with-answers.print-preview-mode .problem-item .answer {
    display: inline;
    visibility: visible;
    height: auto;
}

.print-preview-mode.col-3 #print-area.problems-sheet {
    grid-template-columns: repeat(3, 1fr);
}

.print-preview-mode.col-5 #print-area.problems-sheet {
    grid-template-columns: repeat(5, 1fr);
}

.print-preview-mode.font-large .problem-item {
    font-size: 18pt;
}

.print-preview-mode.font-small .problem-item {
    font-size: 14pt;
}

.print-preview-mode.font-large .problem-item .answer {
    font-size: 16pt;
}

.print-preview-mode.font-small .problem-item .answer {
    font-size: 12pt;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .content-wrapper {
        flex-direction: column;
    }

    .preview-section,
    .print-section {
        width: 100%;
        max-width: none;
    }

    .preview-section {
        margin-bottom: 25px;
    }

    .problems-sheet {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}

@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    h1 {
        font-size: 1.8em;
        margin-bottom: 20px;
    }

    .options {
        padding: 15px;
        gap: 12px;
    }

    .options select,
    .options input[type="number"],
    .options button {
        padding: 8px 12px;
        font-size: 0.9em;
    }

    .problems-sheet {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 15px;
    }

    .preview-section h2,
    .print-section h2 {
        font-size: 1.2em;
        margin-bottom: 15px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
        width: 98%;
    }

    h1 {
        font-size: 1.5em;
    }

    .options {
        padding: 12px;
        gap: 10px;
    }

    .options label {
        display: block;
        margin-bottom: 5px;
        width: 100%;
    }

    .options select,
    .options input[type="number"] {
        width: 100%;
        box-sizing: border-box;
    }

    .options button {
        margin-top: 5px;
        width: 100%;
    }

    .problems-sheet {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: 12px;
        padding: 10px;
    }

    .problem-item {
        padding: 10px;
        font-size: 1em;
    }

    .preview-sheet {
        min-height: 200px;
    }
}

/* 打印选项区域样式 */
.print-options {
    background-color: #f8f9fa;
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 25px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
    border: 1px solid #e0e4e8;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

.print-options label {
    margin-right: 5px;
    font-weight: 500;
    color: #495057;
    display: flex;
    align-items: center;
}

.print-options select {
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 0.95em;
    transition: all 0.2s ease-in-out;
    background-color: white;
}

.print-options select:focus {
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.print-options input[type="checkbox"] {
    margin-right: 5px;
    transform: scale(1.2);
}

.preview-toggle {
    background-color: #6c757d;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 8px 15px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    transition: all 0.2s ease-in-out;
}

.preview-toggle:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
}

.preview-toggle.active {
    background-color: #007bff;
}

/* 删除按钮样式 */
.delete-btn {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: #dc3545;
    color: white;
    border: 2px solid white;
    font-size: 16px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    z-index: 2;
}

.problem-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    background-color: #bd2130;
    transform: scale(1.1);
}

/* Responsive Styles for Print Preview */
@media (max-width: 992px) {
    .print-preview-mode .print-section {
        max-width: 95%;
        padding: 10mm 5mm;
    }
    
    .print-preview-mode #print-area.problems-sheet {
        grid-template-columns: repeat(3, 1fr);
        gap: 8mm 12mm;
    }
    
    .print-preview-mode .problem-item {
        font-size: 13pt;
    }
    
    .print-preview-mode body.print-with-answers .problem-item .answer {
        margin-left: 3mm;
    }
}

@media (max-width: 768px) {
    .print-preview-mode .print-section {
        padding: 8mm 4mm;
    }
    
    .print-preview-mode #print-area.problems-sheet {
        grid-template-columns: repeat(2, 1fr);
        gap: 6mm 10mm;
    }
    
    .print-preview-mode .problem-item {
        font-size: 12pt;
    }
    
    .print-options {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .print-options label, 
    .print-options select, 
    .print-options button {
        margin-bottom: 8px;
        width: 100%;
    }
}

@media (max-width: 480px) {
    .print-preview-mode .print-section {
        padding: 5mm 2mm;
    }
    
    .print-preview-mode #print-area.problems-sheet {
        grid-template-columns: repeat(2, 1fr);
        gap: 5mm 8mm;
    }
    
    .print-preview-mode .problem-item {
        font-size: 11pt;
    }
    
    .print-preview-mode body.print-with-answers .problem-item .answer {
        margin-left: 2mm;
        font-size: 10pt;
    }
}

/* 响应式布局下的5列优化 */
@media (max-width: 992px) {
    body.print-preview-mode.col-5 #print-area.problems-sheet,
    body.col-5 #print-area.problems-sheet {
        grid-template-columns: repeat(4, 1fr) !important; /* 平板设备降为4列 */
        gap: 8mm !important;
    }
}

@media (max-width: 768px) {
    body.print-preview-mode.col-5 #print-area.problems-sheet,
    body.col-5 #print-area.problems-sheet {
        grid-template-columns: repeat(3, 1fr) !important; /* 小平板设备降为3列 */
        gap: 6mm !important;
    }
}

@media (max-width: 480px) {
    body.print-preview-mode.col-5 #print-area.problems-sheet,
    body.col-5 #print-area.problems-sheet {
        grid-template-columns: repeat(2, 1fr) !important; /* 手机设备降为2列 */
        gap: 5mm !important;
    }
}

/* 优化5列布局 */
body.print-preview-mode.col-5 #print-area.problems-sheet,
body.col-5 #print-area.problems-sheet {
    grid-template-columns: repeat(5, 1fr) !important;
    gap: 7mm 6mm !important; /* 减小横向间距和纵向间距 */
    padding: 0 !important;
    margin: 0 auto !important;
    width: 100% !important;
}

/* 5列布局下的字体大小调整 */
body.print-preview-mode.col-5 .problem-item,
body.col-5 .problem-item {
    font-size: 13pt !important; /* 默认字体更小 */
    padding: 0 !important;
    margin: 0 !important;
}

/* 5列布局下的答案字体大小调整 */
body.print-preview-mode.col-5.print-with-answers #print-area .problem-item .answer,
body.col-5.print-with-answers #print-area .problem-item .answer {
    font-size: 11pt !important;
    margin-left: 2mm !important; /* 缩小答案左边距 */
}

/* 5列布局与字体大小组合 */
body.print-preview-mode.col-5.font-large .problem-item,
body.col-5.font-large .problem-item {
    font-size: 14pt !important; /* 大字体模式稍微缩小 */
}

body.print-preview-mode.col-5.font-small .problem-item,
body.col-5.font-small .problem-item {
    font-size: 11pt !important; /* 小字体模式更小 */
}

/* 5列布局下正常字体大小的答案 */
body.print-preview-mode.col-5.font-large.print-with-answers #print-area .problem-item .answer,
body.col-5.font-large.print-with-answers #print-area .problem-item .answer {
    font-size: 12pt !important;
    margin-left: 2mm !important;
}

body.print-preview-mode.col-5.font-small.print-with-answers #print-area .problem-item .answer,
body.col-5.font-small.print-with-answers #print-area .problem-item .answer {
    font-size: 9pt !important;
    margin-left: 1.5mm !important;
}

/* 合并后的控制面板样式 */
.control-panel {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 25px;
    border: 1px solid #e0e4e8;
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}

.options-section {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
    margin-bottom: 15px;
}

.actions-section {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
    border-top: 1px solid #e9ecef;
    padding-top: 15px;
}

.control-panel label {
    margin-right: 5px;
    font-weight: 500;
    color: #495057;
    display: flex;
    align-items: center;
}

.control-panel select,
.control-panel input[type="number"] {
    padding: 10px 12px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 0.95em;
    transition: all 0.2s ease-in-out;
    background-color: white;
}

.control-panel select:focus,
.control-panel input[type="number"]:focus {
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.control-panel input[type="checkbox"] {
    margin-right: 5px;
    transform: scale(1.2);
}

.control-panel button {
    padding: 10px 18px;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.control-panel button:hover {
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.control-panel button:active {
    transform: translateY(0);
}

/* 各按钮颜色 */
#generate-btn {
    background-color: #007bff;
}
#generate-btn:hover {
    background-color: #0056b3;
}

#add-all-to-print-btn {
    background-color: #ffc107;
    color: #212529;
}
#add-all-to-print-btn:hover {
    background-color: #e0a800;
}

#clear-print-btn {
    background-color: #dc3545;
}
#clear-print-btn:hover {
    background-color: #c82333;
}

#print-btn {
    background-color: #28a745;
}
#print-btn:hover {
    background-color: #218838;
}

/* 主内容布局 */
.content-wrapper {
    display: flex;
    gap: 25px;
    margin-bottom: 30px;
}

/* 候选题目区和打印区 */
.generation-section,
.print-section {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 10px;
    border: 1px solid #e0e4e8;
    box-shadow: 0 2px 15px rgba(0,0,0,0.04);
}

.generation-section {
    flex: 1;
    min-width: 250px;
    max-width: 350px;
}

.print-section {
    flex: 3;
    background-color: white;
    max-width: 210mm;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ddd;
}

.generation-section h2,
.print-section h2 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 20px;
    color: #343a40;
    font-size: 1.4em;
    font-weight: 600;
    border-bottom: 1px solid #e9ecef;
    padding-bottom: 12px;
}

.preview-sheet {
    min-height: 300px;
    max-height: 600px;
    overflow-y: auto;
    padding: 15px;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    background-color: #fdfdfd;
}

#print-area.problems-sheet {
    border: none;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12mm 15mm;
    padding: 0;
    background-color: white;
    margin: 20mm 15mm;
}

/* 响应式布局优化 */
@media (max-width: 992px) {
    .content-wrapper {
        flex-direction: column;
    }

    .generation-section,
    .print-section {
        width: 100%;
        max-width: none;
    }

    .generation-section {
        margin-bottom: 25px;
    }

    .options-section,
    .actions-section {
        flex-direction: row;
        flex-wrap: wrap;
    }
}

@media (max-width: 768px) {
    .options-section,
    .actions-section {
        flex-direction: column;
        align-items: flex-start;
    }

    .control-panel label,
    .control-panel select,
    .control-panel input[type="number"],
    .control-panel input[type="checkbox"],
    .control-panel button {
        margin-bottom: 10px;
        width: 100%;
    }

    .control-panel label {
        margin-bottom: 5px;
    }
}

/* 5列模式下的打印预览区域样式 */
.print-preview-mode.col-5 .print-section {
    padding: 15mm 10mm; /* 5列模式下减少内边距 */
}