/* 全局样式 */
:root {
    --primary-color: #4a90e2;
    --secondary-color: #67c23a;
    --danger-color: #f56c6c;
    --border-color: #e4e7ed;
    --background-color: #f5f7fa;
    --text-color: #333;
    --light-text: #909399;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f0f2f5;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

header h1 {
    color: var(--primary-color);
    margin: 0;
    font-size: 28px;
}

header p {
    color: var(--light-text);
    margin: 10px 0 0;
}

/* 上传区域样式 */
.upload-area {
    background: white;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: rgba(74, 144, 226, 0.02);
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: rgba(74, 144, 226, 0.05);
}

.upload-area i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.upload-area p {
    margin: 10px 0;
    font-size: 16px;
    color: var(--text-color);
}

.upload-tip {
    color: var(--light-text);
    font-size: 14px;
}

/* PDF容器样式 */
.pdf-container {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

/* PDF信息样式 */
.pdf-info {
    display: flex;
    gap: 20px;
    padding: 15px;
    background: var(--background-color);
    border-radius: 6px;
    margin-bottom: 20px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.info-item i {
    color: var(--primary-color);
}

/* 分割选项样式 */
.split-options {
    margin-bottom: 30px;
}

.split-options h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 18px;
}

.option-group {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.option-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.option-inputs {
    background: var(--background-color);
    padding: 15px;
    border-radius: 6px;
    margin-top: 10px;
}

.option-inputs label {
    display: block;
    margin-bottom: 8px;
}

.option-inputs input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
}

.input-tip {
    color: var(--light-text);
    font-size: 12px;
    margin-top: 5px;
}

/* 预览容器样式 */
.preview-container {
    margin-bottom: 30px;
}

.preview-container h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 18px;
}

.preview-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

#pdfPreview {
    max-width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: white;
}

.preview-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.preview-controls button {
    background: var(--background-color);
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: all 0.3s ease;
}

.preview-controls button:not(:disabled):hover {
    background: var(--primary-color);
    color: white;
}

.preview-controls button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 操作按钮样式 */
.action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    padding: 20px;
    background: var(--background-color);
    border-radius: 8px;
    justify-content: center;
}

.primary-button, .secondary-button {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.primary-button {
    background: var(--primary-color);
    color: white;
}

.primary-button:hover:not(:disabled) {
    background: #357abd;
    transform: translateY(-1px);
}

.secondary-button {
    background: white;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.secondary-button:hover:not(:disabled) {
    background: var(--background-color);
    border-color: var(--primary-color);
}

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* 加载状态 */
.loading {
    position: relative;
    pointer-events: none;
}

.loading:after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    border: 3px solid transparent;
    border-top-color: white;
    border-radius: 50%;
    animation: loading-spinner 1s ease infinite;
}

@keyframes loading-spinner {
    to {transform: rotate(360deg);}
}

/* 分割结果样式 */
.split-results {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-top: 30px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

.split-results h3 {
    color: var(--text-color);
    margin-bottom: 20px;
    font-size: 18px;
}

.result-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: var(--background-color);
    border-radius: 6px;
    transition: all 0.3s ease;
}

.result-item:hover {
    transform: translateX(5px);
}

.result-item-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.result-item-info i {
    color: var(--primary-color);
    font-size: 20px;
}

.result-item-name {
    font-weight: 500;
}

.result-item-pages {
    color: var(--light-text);
    font-size: 14px;
}

.download-button {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s ease;
}

.download-button:hover {
    background: #5aaf2f;
    transform: translateY(-1px);
}

/* 头部按钮样式 */
.header-buttons {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.nav-button, .help-button {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.nav-button {
    background: var(--background-color);
    color: var(--text-color);
}

.help-button {
    background: var(--primary-color);
    color: white;
}

.nav-button:hover {
    background: var(--border-color);
}

.help-button:hover {
    background: #357abd;
}

/* 帮助对话框样式 */
.help-dialog {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.help-content {
    background: white;
    border-radius: 8px;
    padding: 30px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.help-content h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.help-section h3 {
    color: var(--text-color);
    margin-bottom: 15px;
}

.help-section ol, .help-section ul {
    padding-left: 20px;
}

.help-section li {
    margin-bottom: 10px;
    line-height: 1.6;
}

.help-section strong {
    color: var(--primary-color);
}

/* 预览对话框样式 */
.preview-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    max-width: 500px;
    width: 90%;
}

.preview-info h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 18px;
}

.preview-info ul {
    max-height: 300px;
    overflow-y: auto;
    padding-left: 20px;
}

.preview-info li {
    margin-bottom: 8px;
    color: var(--text-color);
}

/* 结果操作按钮样式 */
.result-actions {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

/* 关闭按钮样式 */
.close-button {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    color: var(--light-text);
    cursor: pointer;
    padding: 5px;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: all 0.3s ease;
}

.close-button:hover {
    color: var(--danger-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .option-group {
        flex-direction: column;
        gap: 10px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .result-item {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .preview-controls {
        flex-direction: column;
        width: 100%;
    }
    
    .preview-controls button {
        width: 100%;
        justify-content: center;
    }

    .header-buttons {
        flex-direction: column;
    }

    .nav-button, .help-button {
        width: 100%;
        justify-content: center;
    }

    .preview-dialog {
        width: 95%;
        max-height: 80vh;
        overflow-y: auto;
    }

    .result-actions {
        flex-direction: column;
    }
}