.tool-header {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(16, 185, 129, 0.1));
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius);
}
.tool-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}
.tool-icon-large {
    font-size: 3rem;
}
.tool-title h1 {
    margin-bottom: 0.5rem;
}
.tool-title p {
    color: var(--text-muted);
    margin: 0;
}
.controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}
.diff-options {
    display: flex;
    gap: var(--spacing-md);
    margin-left: auto;
}
.diff-options label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}
.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}
.editor-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 500px;
}
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}
.panel-header h3 {
    font-size: 1rem;
    margin: 0;
    color: var(--text-primary);
}
.text-editor {
    flex: 1;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    line-height: 1.6;
    resize: none;
    outline: none;
}
.text-editor:focus {
    background: rgba(15, 23, 42, 0.8);
}
.output-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}
.diff-output {
    padding: var(--spacing-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    line-height: 1.6;
    min-height: 300px;
    white-space: pre-wrap;
    word-break: break-word;
}
ins {
    background-color: rgba(16, 185, 129, 0.2);
    color: #10b981;
    text-decoration: none;
    border-radius: 2px;
}
del {
    background-color: rgba(239, 68, 68, 0.2);
    color: #ef4444;
    text-decoration: none;
    border-radius: 2px;
}
.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.85rem;
    background: var(--bg-hover);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
}
.btn-sm:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}
.features-info {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}
.features-info h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}
.features-info ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-sm);
}
.features-info li {
    color: var(--text-secondary);
    padding: 0.5rem 0;
}
@media (max-width: 768px) {
    .editor-container {
        grid-template-columns: 1fr;
    }
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    .diff-options {
        margin-left: 0;
        justify-content: space-between;
    }
}