/* 文本差异对比工具样式 */
.diff-section {
    min-height: 100vh;
    padding: 120px 0 80px;
    background: var(--dark-bg);
}

.diff-container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 40px rgba(0,0,0,.1);
    backdrop-filter: blur(10px);
}

.diff-container h2 {
    text-align: center;
    margin-bottom: .5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 2.5rem;
    font-weight: 700;
}

.diff-subtitle {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 2.5rem;
    font-size: 1.2rem;
}

/* 操作按钮 */
.diff-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
    align-items: center;
    justify-content: space-between;
}

.action-btn {
    padding: .8rem 1.2rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--dark-bg);
    color: var(--text-light);
    cursor: pointer;
    transition: all .3s ease;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: .5rem;
}

.action-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

.action-btn.primary {
    background: var(--gradient-accent);
    color: white;
    border-color: transparent;
    box-shadow: 0 8px 25px rgba(0,198,255,.3);
}

.action-btn.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(0,198,255,.4);
}

.view-options {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.view-options label {
    display: flex;
    align-items: center;
    gap: .5rem;
    color: var(--text-gray);
    font-weight: 500;
    cursor: pointer;
}

.view-options input[type="checkbox"] {
    accent-color: var(--accent-color);
}

/* 工作区 */
.diff-workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    min-height: 500px;
}

.text-panel {
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, rgba(0,198,255,.1), rgba(0,198,255,.05));
    border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
    margin: 0;
    color: var(--text-light);
    font-size: 1.1rem;
    font-weight: 600;
}

.panel-actions {
    display: flex;
    gap: .5rem;
}

.icon-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-gray);
    cursor: pointer;
    border-radius: 6px;
    transition: all .3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: var(--accent-color);
    color: white;
}

/* 文本编辑器容器 */
.text-editor-container {
    display: flex;
    flex: 1;
    position: relative;
}

.line-numbers {
    background: rgba(0,0,0,.2);
    border-right: 1px solid var(--border-color);
    padding: 1rem .5rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: .9rem;
    line-height: 1.6;
    color: var(--text-gray);
    text-align: right;
    min-width: 50px;
    overflow: hidden;
    user-select: none;
    white-space: pre-line; /* ← 使\n换行符生效 */
}

#original-text,
#modified-text {
    flex: 1;
    width: 100%;
    padding: 1rem 1.5rem;
    border: none;
    background: transparent;
    color: var(--text-light);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: .95rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    tab-size: 4;
}

.panel-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .8rem 1.5rem;
    background: rgba(0,0,0,.2);
    border-top: 1px solid var(--border-color);
    font-size: .85rem;
    color: var(--text-gray);
}

/* 对比结果 */
.diff-result {
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 2rem;
    overflow: hidden;
    animation: fadeIn .5s ease;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, rgba(0,198,255,.1), rgba(0,198,255,.05));
    border-bottom: 1px solid var(--border-color);
}

.result-header h3 {
    margin: 0;
    color: var(--text-light);
    font-size: 1.3rem;
    font-weight: 600;
}

.result-stats {
    display: flex;
    gap: 1.5rem;
}

.result-stats span {
    display: flex;
    align-items: center;
    gap: .5rem;
    font-weight: 500;
}

.added-stat {
    color: #28a745;
}

.deleted-stat {
    color: #dc3545;
}

.modified-stat {
    color: #ffc107;
}

.result-actions {
    display: flex;
    gap: .5rem;
}

/* 对比内容 */
.diff-content {
    padding: 1.5rem;
}

.diff-view {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: .9rem;
    line-height: 1.6;
}

.diff-view.side-by-side {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.diff-panel {
    background: rgba(0,0,0,.1);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.diff-panel h4 {
    margin: 0;
    padding: .8rem 1rem;
    background: rgba(0,0,0,.2);
    color: var(--text-light);
    font-size: 1rem;
    font-weight: 600;
}

.diff-lines {
    padding: 1rem;
    max-height: 600px;
    overflow-y: auto;
}

.diff-line {
    display: flex;
    margin-bottom: 1px;
    border-radius: 4px;
    transition: all .3s ease;
}

.diff-line:hover {
    background: rgba(255,255,255,.05);
}

.diff-line-number {
    min-width: 50px;
    padding: .2rem .5rem;
    text-align: right;
    color: var(--text-gray);
    font-size: .8rem;
    user-select: none;
    border-right: 1px solid var(--border-color);
    margin-right: .5rem;
}

.diff-line-content {
    flex: 1;
    padding: .2rem .5rem;
    word-break: break-all;
    white-space: pre-wrap !important; /* 保留换行和空格 */
    word-wrap: break-word; /* 允许长单词换行 */
}

.diff-line.added {
    background: rgba(40, 167, 69, .2);
    border-left: 4px solid #28a745;
}

.diff-line.deleted {
    background: rgba(220, 53, 69, .2);
    border-left: 4px solid #dc3545;
}

.diff-line.modified {
    background: rgba(255, 193, 7, .2);
    border-left: 4px solid #ffc107;
}

.diff-line.unchanged {
    background: transparent;
    border-left: 4px solid transparent;
}

.diff-word {
    border-radius: 3px;
    padding: .1rem .2rem;
}

.diff-word.added {
    background: rgba(40, 167, 69, .4);
    color: #d4edda;
}

.diff-word.deleted {
    background: rgba(220, 53, 69, .4);
    color: #f8d7da;
    text-decoration: line-through;
}

/* 统一视图 */
.unified .diff-line {
    padding: .3rem .5rem;
}

.unified .diff-line-number {
    display: inline-block;
    min-width: 80px;
    margin-right: 1rem;
}

/* 设置 */
.diff-settings {
    background: linear-gradient(135deg, rgba(0,198,255,.05), rgba(0,198,255,.02));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.diff-settings h3 {
    margin-bottom: 1.5rem;
    color: var(--text-light);
    font-size: 1.3rem;
    font-weight: 600;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: .8rem;
}

.setting-item label {
    color: var(--text-gray);
    font-weight: 500;
    font-size: 1rem;
}

.setting-item select,
.setting-item input[type="range"] {
    padding: .8rem;
    border: 2px solid var(--border-color);
    background: var(--dark-bg);
    color: var(--text-light);
    border-radius: 8px;
    outline: none;
    transition: all .3s ease;
}

.setting-item select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0,198,255,.2);
}

#threshold {
    -webkit-appearance: none;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
}

#threshold::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,.2);
}

#threshold-value {
    text-align: center;
    color: var(--accent-color);
    font-weight: 600;
    min-width: 50px;
}

/* 使用说明 */
.tips-section {
    background: linear-gradient(135deg, rgba(0,198,255,.05), rgba(0,198,255,.02));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.tips-section h3 {
    margin-bottom: 1.5rem;
    color: var(--text-light);
    font-size: 1.3rem;
    font-weight: 600;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.tip-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: rgba(0,0,0,.2);
    border-radius: 8px;
}

.tip-item i {
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-top: .2rem;
}

.tip-item h4 {
    color: var(--text-light);
    margin-bottom: .5rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.tip-item p {
    color: var(--text-gray);
    line-height: 1.5;
    margin: 0;
}

.color-added {
    color: #28a745;
    font-weight: 600;
}

.color-deleted {
    color: #dc3545;
    font-weight: 600;
}

.color-modified {
    color: #ffc107;
    font-weight: 600;
}

/* 返回链接 */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    margin-top: 2rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: all .3s ease;
}

.back-link:hover {
    gap: .8rem;
    color: #00a8e8;
}

/* 动画 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .diff-container {
        padding: 2rem;
        margin: 0 1rem;
    }
    
    .diff-workspace {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        min-height: 400px;
    }
    
    .diff-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .view-options {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .diff-view.side-by-side {
        grid-template-columns: 1fr;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
}

/* 行内差异高亮 */
.diff-word {
    border-radius: 3px;
    padding: 0.1rem 0.2rem;
}

.diff-word.added {
    background-color: rgba(40, 167, 69, 0.4);
    color: #d4edda;
    font-weight: 600;
}

.diff-word.deleted {
    background-color: rgba(220, 53, 69, 0.4);
    color: #f8d7da;
    font-weight: 600;
    text-decoration: line-through;
}