.diff-tool-container {
    max-width: 1400px;
    margin: 0 auto;
}

.diff-options {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: 20px;
    margin-bottom: 25px;
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.option-group {
    flex: 1;
    min-width: 250px;
}

.option-label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    font-size: 0.95rem;
}

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

.radio-option {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-speed);
}

.radio-option:hover {
    background: var(--bg-color);
}

.radio-option input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

.radio-label {
    color: var(--text-color);
    font-size: 0.9rem;
}

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

.checkbox-option {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-speed);
}

.checkbox-option:hover {
    background: var(--bg-color);
}

.checkbox-option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

.checkbox-label {
    color: var(--text-color);
    font-size: 0.9rem;
}

.diff-input-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 25px;
}

@media (max-width: 900px) {
    .diff-input-section {
        grid-template-columns: 1fr;
    }
}

.input-panel {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
    margin: 0;
    font-size: 1rem;
    color: var(--text-primary);
}

.clear-btn {
    padding: 6px 12px;
    border: 1px solid var(--danger-color);
    background: transparent;
    color: var(--danger-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.clear-btn:hover {
    background: var(--danger-color);
    color: white;
}

.diff-textarea {
    width: 100%;
    min-height: 250px;
    padding: 15px;
    border: none;
    background: var(--input-bg);
    color: var(--text-color);
    font-family: 'Courier New', Consolas, monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    box-sizing: border-box;
}

.diff-textarea:focus {
    outline: none;
    background: var(--bg-color);
}

.panel-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
}

.char-count {
    font-size: 0.85rem;
    color: var(--description-color);
}

.paste-btn {
    padding: 6px 12px;
    border: 1px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.paste-btn:hover {
    background: var(--primary-color);
    color: white;
}

.diff-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.compare-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.compare-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

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

.swap-btn,
.sample-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border: 2px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.swap-btn:hover,
.sample-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.diff-result-section {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 10px;
}

.result-header h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.result-actions {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.stat-added,
.stat-removed,
.stat-modified {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.stat-added strong {
    color: var(--success-color);
}

.stat-removed strong {
    color: var(--danger-color);
}

.stat-modified strong {
    color: var(--warning-color);
}

.diff-output {
    padding: 20px;
    min-height: 200px;
    max-height: 600px;
    overflow: auto;
    font-family: 'Courier New', Consolas, monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    background: var(--input-bg);
}

.placeholder-text {
    text-align: center;
    color: var(--description-color);
    padding: 40px 20px;
}

.diff-line {
    display: flex;
    padding: 2px 0;
    border-radius: 2px;
    margin-bottom: 2px;
}

.diff-line:hover {
    background: var(--bg-color);
}

.line-number {
    min-width: 50px;
    padding-right: 15px;
    text-align: right;
    color: var(--description-color);
    user-select: none;
    font-size: 0.85rem;
}

.line-content {
    flex: 1;
    white-space: pre-wrap;
    word-break: break-word;
}

.diff-line.added {
    background: rgba(34, 197, 94, 0.1);
}

.diff-line.added .line-content {
    color: var(--success-color);
}

.diff-line.added .line-number {
    color: var(--success-color);
}

.diff-line.removed {
    background: rgba(239, 68, 68, 0.1);
}

.diff-line.removed .line-content {
    color: var(--danger-color);
}

.diff-line.removed .line-number {
    color: var(--danger-color);
}

.diff-line.modified {
    background: rgba(245, 158, 11, 0.1);
}

.diff-line.modified .line-content {
    color: var(--warning-color);
}

.diff-line.modified .line-number {
    color: var(--warning-color);
}

.diff-line.unchanged {
    color: var(--text-secondary);
}

.diff-line.unchanged .line-number {
    color: var(--description-color);
}

.diff-stats {
    display: flex;
    gap: 30px;
    padding: 15px 20px;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    display: block;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--description-color);
}

.stat-item.added .stat-value {
    color: var(--success-color);
}

.stat-item.removed .stat-value {
    color: var(--danger-color);
}

.stat-item.modified .stat-value {
    color: var(--warning-color);
}

@media (max-width: 768px) {
    .diff-options {
        flex-direction: column;
        gap: 20px;
    }

    .option-group {
        min-width: 100%;
    }

    .radio-group,
    .checkbox-group {
        flex-direction: column;
        gap: 8px;
    }

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

    .compare-btn,
    .swap-btn,
    .sample-btn {
        width: 100%;
        justify-content: center;
    }

    .result-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .result-actions {
        width: 100%;
        justify-content: flex-start;
    }
}