/* XML Formatter Professional Styles */
:root {
    /* Primary Colors */
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --primary-dark: #3730a3;
    
    /* Secondary Colors */
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --secondary-light: #f8fafc;
    --secondary-dark: #334155;
    
    /* Status Colors */
    --success-color: #10b981;
    --success-light: #d1fae5;
    --warning-color: #f59e0b;
    --warning-light: #fef3c7;
    --error-color: #ef4444;
    --error-light: #fee2e2;
    --info-color: #3b82f6;
    --info-light: #dbeafe;
    
    /* Neutral Colors */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Layout */
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Source Code Pro', Consolas, monospace;
    
    /* Animations */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

/* Base Styles */
* {
    box-sizing: border-box;
}

.tool-main {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: var(--spacing-xl) 0;
    font-family: var(--font-family);
}

.xml-formatter-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Tool Header */
.tool-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.tool-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.tool-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Format Mode Selector */
.format-mode-selector {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius);
    color: var(--gray-700);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    text-decoration: none;
}

.mode-btn:hover {
    background: rgba(255, 255, 255, 1);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.mode-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.mode-icon {
    font-size: 1.2rem;
}

/* Main Content */
.main-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: var(--spacing-xl);
}

.format-mode-content {
    display: none;
}

.format-mode-content.active {
    display: block;
}
/* Editor Layout */
.editor-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.input-section,
.output-section {
    display: flex;
    flex-direction: column;
}

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.form-label {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 1rem;
    margin: 0;
}

.section-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Textareas */
.xml-textarea {
    width: 100%;
    min-height: 400px;
    padding: var(--spacing-lg);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
    background: var(--gray-50);
    color: var(--gray-800);
    resize: vertical;
    transition: all var(--transition-normal);
}

.xml-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    background: white;
}

.xml-textarea::placeholder {
    color: var(--gray-400);
}

.xml-textarea[readonly] {
    background: var(--gray-100);
    cursor: default;
}

/* Stats */
.input-stats,
.output-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-top: 1px solid var(--gray-200);
}

.stat-item {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.stat-item span {
    font-weight: 600;
    color: var(--primary-color);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    justify-content: center;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: white;
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-outline:hover:not(:disabled) {
    background: var(--gray-50);
    border-color: var(--gray-300);
    color: var(--gray-800);
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.8rem;
}

.btn-icon {
    font-size: 1rem;
}

/* Formatting Options */
.formatting-options {
    background: var(--gray-50);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--gray-200);
}

.formatting-options h4 {
    color: var(--gray-800);
    margin-bottom: var(--spacing-lg);
    font-size: 1.125rem;
    font-weight: 600;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-group label {
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.form-select {
    padding: var(--spacing-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    background: white;
    color: var(--gray-700);
    font-size: 0.875rem;
    transition: all var(--transition-normal);
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.checkbox-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--gray-700);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
}

/* Format Controls */
.format-controls {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* Validation Results */
.validation-results {
    background: var(--gray-50);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    border: 1px solid var(--gray-200);
}

.validation-summary {
    margin-bottom: var(--spacing-lg);
}

.validation-details {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    white-space: pre-wrap;
}

.validation-success {
    background: var(--success-light);
    color: var(--success-color);
    border-color: var(--success-color);
}

.validation-error {
    background: var(--error-light);
    color: var(--error-color);
    border-color: var(--error-color);
}

/* Minify Stats */
.minify-stats {
    margin-top: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.stats-grid .stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--gray-200);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Batch Processing */
.batch-upload {
    border: 2px dashed var(--gray-300);
    border-radius: var(--border-radius);
    padding: var(--spacing-2xl);
    text-align: center;
    background: var(--gray-50);
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-bottom: var(--spacing-lg);
}

.batch-upload:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.batch-upload.dragover {
    border-color: var(--primary-color);
    background: var(--primary-light);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 3rem;
    color: var(--gray-400);
    margin-bottom: var(--spacing-md);
}

.upload-text {
    color: var(--gray-600);
    font-size: 1rem;
}

.batch-results {
    margin-top: var(--spacing-lg);
}

.batch-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-sm);
}

.batch-item-info {
    flex: 1;
}

.batch-item-name {
    font-weight: 500;
    color: var(--gray-800);
}

.batch-item-status {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.batch-item-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    padding: var(--spacing-xl);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: var(--border-radius-lg);
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
    margin: 0;
    color: var(--gray-800);
}

.modal-body {
    padding: var(--spacing-xl);
    overflow-y: auto;
    max-height: 70vh;
}

/* History Section */
.history-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

.history-header h3 {
    margin: 0;
    color: var(--gray-800);
    font-size: 1.5rem;
    font-weight: 600;
}

.history-controls {
    display: flex;
    gap: var(--spacing-md);
}

.history-list {
    max-height: 400px;
    overflow-y: auto;
}

.history-item {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-normal);
}

.history-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.history-item-title {
    font-weight: 600;
    color: var(--gray-800);
}

.history-item-time {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.history-item-preview {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--gray-600);
    background: var(--gray-50);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    max-height: 60px;
    overflow: hidden;
    position: relative;
}

.no-history {
    text-align: center;
    color: var(--gray-500);
    font-style: italic;
    padding: var(--spacing-2xl);
}

/* Tool Info */
.tool-info {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: var(--spacing-xl);
}

.info-section h3 {
    color: var(--gray-800);
    margin-bottom: var(--spacing-xl);
    font-size: 1.5rem;
    font-weight: 600;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.feature-item {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

.feature-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.feature-item h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
    font-weight: 600;
}

.feature-item p {
    color: var(--gray-600);
    font-size: 0.875rem;
    line-height: 1.5;
    margin: 0;
}

.info-section h4 {
    color: var(--gray-800);
    margin: var(--spacing-2xl) 0 var(--spacing-lg);
    font-size: 1.25rem;
    font-weight: 600;
}

.info-section ol {
    color: var(--gray-600);
    line-height: 1.6;
    padding-left: var(--spacing-lg);
}

.info-section li {
    margin-bottom: var(--spacing-sm);
}

.info-section strong {
    color: var(--gray-800);
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .editor-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .tool-main {
        padding: var(--spacing-lg) 0;
    }
    
    .xml-formatter-container {
        padding: 0 var(--spacing-sm);
    }
    
    .tool-header {
        padding: var(--spacing-xl);
    }
    
    .tool-header h1 {
        font-size: 2rem;
    }
    
    .main-content {
        padding: var(--spacing-xl);
    }
    
    .format-mode-selector {
        flex-direction: column;
        align-items: stretch;
    }
    
    .mode-btn {
        justify-content: center;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .xml-textarea {
        min-height: 300px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .history-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .format-controls {
        justify-content: stretch;
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .tool-header h1 {
        font-size: 1.75rem;
    }
    
    .tool-description {
        font-size: 1rem;
    }
    
    .xml-textarea {
        min-height: 250px;
        font-size: 12px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .input-stats,
    .output-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.format-mode-content.active {
    animation: fadeIn 0.3s ease-in-out;
}

.history-item {
    animation: slideIn 0.3s ease-in-out;
}

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

/* Loading States */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* Accessibility */
.btn:focus-visible,
.form-select:focus-visible,
.xml-textarea:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.alert {
    border: none;
    border-radius: 12px;
    padding: 16px 20px;
}

.alert-success {
    background: rgba(5, 150, 105, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background: rgba(220, 38, 38, 0.1);
    color: var(--error-color);
    border-left: 4px solid var(--error-color);
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.accordion-button {
    border-radius: 12px;
    background: var(--light-color);
    border: none;
    padding: 15px 20px;
    font-weight: 500;
}

.accordion-button:not(.collapsed) {
    background: var(--primary-color);
    color: white;
}

.accordion-body {
    background: white;
    border-radius: 0 0 12px 12px;
}

.tool-header {
    text-align: center;
    padding: 30px 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px 20px 0 0;
    margin-bottom: 30px;
}

.tool-title {
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.tool-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    margin: 0;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list i {
    color: var(--success-color);
    margin-right: 10px;
}

.history-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 10px;
    transition: all 0.3s ease;
}

.history-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.code-highlight {
    background: #1e293b;
    color: #e2e8f0;
    border-radius: 8px;
    padding: 20px;
    font-family: 'Courier New', monospace;
    overflow-x: auto;
    margin: 20px 0;
}

.loading-spinner {
    display: none;
    text-align: center;
    padding: 20px;
}

.loading-spinner .spinner-border {
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .tool-title {
        font-size: 2rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    .nav-tabs .nav-link {
        padding: 10px 16px;
        font-size: 14px;
    }
}