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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

.config-panel {
    background: white;
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.config-panel h2 {
    color: #333;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #eee;
    font-size: 1.4rem;
}

.config-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
}

.config-item {
    flex: 1;
    min-width: 200px;
}

.config-item label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

.config-item input[type="number"],
.config-item input[type="text"],
.config-item select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.config-item input[type="number"]:focus,
.config-item input[type="text"]:focus,
.config-item select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 10px 15px;
    background: #f5f5f5;
    border-radius: 8px;
    transition: background 0.3s;
}

.checkbox-label:hover {
    background: #eee;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: 10px;
    cursor: pointer;
    accent-color: #667eea;
}

.checkbox-label span {
    font-size: 0.95rem;
    color: #444;
}

/* 运算类型配置区块 */
.op-config-section {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 15px;
    border: 2px solid #e9ecef;
    transition: border-color 0.3s, background 0.3s;
}

.op-config-section:has(input[type="checkbox"]:checked) {
    border-color: #667eea;
    background: #f0f3ff;
}

.op-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.op-header .checkbox-label {
    background: white;
    border: 2px solid #ddd;
}

.op-header .checkbox-label:has(input:checked) {
    border-color: #667eea;
    background: #667eea;
}

.op-header .checkbox-label:has(input:checked) span {
    color: white;
}

.op-title {
    font-weight: 600;
    font-size: 1.05rem;
}

.sub-option {
    font-size: 0.9rem;
    padding: 8px 12px !important;
}

.sub-option span {
    font-size: 0.85rem !important;
}

.op-range-row {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    padding-left: 10px;
}

.op-range-row .range-config {
    flex: 1;
    min-width: 250px;
}

.range-config label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
    font-size: 0.9rem;
}

.range-config .range-inputs {
    display: flex;
    align-items: center;
    gap: 10px;
}

.range-config .range-inputs input {
    width: 80px;
    padding: 10px;
    text-align: center;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.range-config .range-inputs input:focus {
    outline: none;
    border-color: #667eea;
}

.range-config .range-inputs span {
    color: #666;
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(17, 153, 142, 0.4);
}

.btn-success:hover {
    box-shadow: 0 6px 20px rgba(17, 153, 142, 0.5);
}

.btn-secondary {
    background: linear-gradient(135deg, #606c88 0%, #3f4c6b 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(96, 108, 136, 0.4);
}

.btn-secondary:hover {
    box-shadow: 0 6px 20px rgba(96, 108, 136, 0.5);
}

.preview-panel {
    background: #e0e0e0;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

#pagesContainer {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.paper {
    background: white;
    max-width: 210mm;
    height: 297mm;
    margin: 0 auto;
    padding: 15mm 20mm;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
}

.page-number {
    text-align: center;
    color: #888;
    font-size: 0.9rem;
    padding-top: 10px;
    border-top: 1px dashed #ddd;
    flex-shrink: 0;
}

.paper-title {
    text-align: center;
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #333;
    flex-shrink: 0;
}

.paper-info {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px dashed #ccc;
    font-size: 1rem;
    color: #555;
}

.questions-container {
    display: grid;
    flex: 1;
    align-content: space-between;
}

.questions-container.cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.questions-container.cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.questions-container.cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

.questions-container.cols-5 {
    grid-template-columns: repeat(5, 1fr);
}

.question-item {
    font-size: 1rem;
    padding: 6px 0;
    color: #333;
    display: flex;
    align-items: center;
    white-space: nowrap;
}

.question-number {
    color: #888;
    margin-right: 5px;
    min-width: 28px;
    flex-shrink: 0;
}

.question-content {
    flex: 1;
    white-space: nowrap;
}

.question-answer {
    color: #e74c3c;
    font-weight: bold;
    margin-left: 5px;
}

.placeholder-text {
    grid-column: 1 / -1;
    text-align: center;
    color: #999;
    font-size: 1.2rem;
    padding: 50px;
}

/* 打印样式 */
@media print {
    * {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    body {
        background: white !important;
        padding: 0 !important;
        margin: 0 !important;
    }

    .container {
        max-width: none !important;
    }

    header,
    .config-panel {
        display: none !important;
    }

    .preview-panel {
        background: none !important;
        padding: 0 !important;
        box-shadow: none !important;
        border-radius: 0 !important;
    }

    #pagesContainer {
        gap: 0 !important;
    }

    .paper {
        box-shadow: none !important;
        max-width: none !important;
        width: 100% !important;
        height: auto !important;
        min-height: 270mm !important;
        padding: 10mm !important;
        margin: 0 !important;
        page-break-after: always !important;
        display: flex !important;
        flex-direction: column !important;
    }

    .paper:last-child {
        page-break-after: auto !important;
    }

    .paper-title {
        font-size: 1.5rem !important;
        margin-bottom: 10px !important;
        padding-bottom: 8px !important;
        flex-shrink: 0 !important;
    }

    .paper-info {
        margin-bottom: 20px !important;
        padding-bottom: 15px !important;
        font-size: 0.9rem !important;
    }

    .questions-container {
        flex: 1 !important;
        align-content: space-between !important;
    }

    .questions-container.cols-2 {
        grid-template-columns: repeat(2, 1fr) !important;
    }

    .questions-container.cols-3 {
        grid-template-columns: repeat(3, 1fr) !important;
    }

    .questions-container.cols-4 {
        grid-template-columns: repeat(4, 1fr) !important;
    }

    .questions-container.cols-5 {
        grid-template-columns: repeat(5, 1fr) !important;
    }

    .question-item {
        break-inside: avoid !important;
        font-size: 0.95rem !important;
        padding: 5px 0 !important;
        white-space: nowrap !important;
    }

    .question-number {
        min-width: 25px !important;
    }

    .page-number {
        font-size: 0.85rem !important;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .config-panel {
        padding: 20px;
    }

    .config-row {
        flex-direction: column;
    }

    .config-item {
        min-width: 100%;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .paper {
        padding: 15px;
    }

    .paper-info {
        flex-direction: column;
        gap: 10px;
    }

    .questions-container {
        grid-template-columns: 1fr !important;
    }
}