/* HTML Table to Excel Converter - Modern Slick Design */

/* ===============================================
   MODERN TOOL HEADER DESIGN
   =============================================== */
.tool-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--info-color) 100%);
    border-radius: var(--radius-xl);
    color: white;
    position: relative;
    overflow: hidden;
}

.tool-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.tool-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.tool-header p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

/* ===============================================
   MODERN SECTION CONTAINERS
   =============================================== */
.presets-section,
.input-section,
.preview-section,
.export-section {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.presets-section::before,
.input-section::before,
.preview-section::before,
.export-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color), var(--success-color));
}

.presets-section:hover,
.input-section:hover,
.preview-section:hover,
.export-section:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-hover);
}

.converter-main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Section Headers */
.presets-section h2,
.input-section h2,
.preview-section h2,
.export-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.presets-section h2 i,
.input-section h2 i,
.preview-section h2 i,
.export-section h2 i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* ===============================================
   QUICK PRESETS SECTION
   =============================================== */
.presets-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.preset-categories {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.preset-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.875rem 1.75rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    font-weight: 600;
    position: relative;
    overflow: hidden;
    font-size: 0.95rem;
}

.preset-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.preset-btn:hover::before {
    left: 100%;
}

.preset-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.preset-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-lg);
}

.preset-preview {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    min-height: 200px;
    overflow: auto;
    transition: var(--transition);
}

.preset-preview:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.preset-preview table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.preset-preview th,
.preset-preview td {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    text-align: left;
}

.preset-preview th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.preset-preview tr:nth-child(even) {
    background: var(--bg-primary);
}

.preset-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ===============================================
   INPUT METHODS SECTION
   =============================================== */
.input-methods {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.method-tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 2rem;
}

.tab-btn {
    background: var(--bg-secondary);
    border: none;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    font-weight: 600;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.tab-btn:hover::before {
    left: 100%;
}

.tab-btn:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
    border-bottom: 2px solid var(--primary-color);
    margin-bottom: -2px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.input-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.html-textarea {
    width: 100%;
    min-height: 200px;
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: vertical;
    transition: var(--transition);
}

.html-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.html-textarea::placeholder {
    color: var(--text-muted);
}

/* File Upload Area */
.file-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.file-upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.05), transparent);
    transition: left 0.8s;
}

.file-upload-area:hover::before {
    left: 100%;
}

.file-upload-area:hover {
    border-color: var(--primary-color);
    background: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.file-upload-area.dragover {
    border-color: var(--success-color);
    background: rgba(34, 197, 94, 0.05);
    border-style: solid;
}

.upload-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-text h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-text p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-top: 1rem;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
}

.file-details i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

/* Table Builder */
.table-builder {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.builder-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
}

.size-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.size-controls label {
    font-weight: 600;
    color: var(--text-primary);
}

.size-controls input[type="number"] {
    width: 80px;
    padding: 0.5rem 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-weight: 500;
    text-align: center;
    transition: var(--transition);
}

.size-controls input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.table-options {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    color: var(--text-primary);
    font-weight: 500;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    position: relative;
    background: var(--bg-primary);
    transition: var(--transition);
}

.checkmark::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    opacity: 0;
    transition: var(--transition);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    opacity: 1;
}

.manual-table-container {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    overflow: auto;
    max-height: 400px;
}

.manual-table-container table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.manual-table-container th,
.manual-table-container td {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.manual-table-container th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.manual-table-container input {
    width: 100%;
    border: none;
    background: transparent;
    padding: 0.25rem;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.manual-table-container input:focus {
    outline: 2px solid var(--primary-color);
    border-radius: var(--radius-sm);
}

/* ===============================================
   PREVIEW SECTION
   =============================================== */
.preview-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.table-stats {
    display: flex;
    gap: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.table-preview {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    max-height: 400px;
    overflow: auto;
    transition: var(--transition);
}

.table-preview:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.table-preview table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.table-preview th,
.table-preview td {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    text-align: left;
}

.table-preview th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 10;
}

.table-preview tr:nth-child(even) {
    background: var(--bg-secondary);
}

.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    color: var(--border-color);
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

/* ===============================================
   EXPORT SECTION
   =============================================== */
.export-container {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 3rem;
    align-items: start;
}

.export-options {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.format-selection h3,
.export-settings h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.format-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.format-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    min-width: 150px;
    position: relative;
    overflow: hidden;
}

.format-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.6s;
}

.format-btn:hover::before {
    left: 100%;
}

.format-btn i {
    font-size: 2rem;
    color: var(--primary-color);
}

.format-btn span {
    font-weight: 600;
    color: var(--text-primary);
}

.format-btn small {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.format-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.format-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-lg);
}

.format-btn.active i,
.format-btn.active span,
.format-btn.active small {
    color: white;
}

.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-input {
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
}

.setting-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.setting-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.export-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
}

.export-info {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.export-info span {
    font-weight: 600;
    color: var(--primary-color);
}

/* ===============================================
   BUTTON STYLES
   =============================================== */
.btn {
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s;
}

.btn:hover::before {
    left: 100%;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
}

.btn-secondary {
    background: linear-gradient(135deg, var(--text-muted), var(--text-secondary));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #16a34a);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error-color), #dc2626);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
    font-weight: 700;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn:disabled::before {
    display: none;
}

/* ===============================================
   SEO CONTENT SECTIONS
   =============================================== */
.seo-content {
    margin-top: 4rem;
}

.seo-content section {
    padding: 4rem 0;
    margin-bottom: 2rem;
}

.seo-content section:nth-child(even) {
    background: var(--bg-secondary);
}

.seo-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 3rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.seo-content h2 i {
    color: var(--primary-color);
    font-size: 2rem;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.step-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.step-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color));
}

.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.step-number {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.step-number::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

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

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.features-container {
    margin: 2rem 0;
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.feature-item i {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: white;
    flex-shrink: 0;
}

.feature-item h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.use-case-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.use-case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--warning-color), var(--success-color));
}

.use-case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.use-case-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--warning-color), var(--success-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.5rem;
    color: white;
    transition: var(--transition);
}

.use-case-card:hover .use-case-icon {
    transform: scale(1.1);
}

.use-case-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.use-case-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* FAQ Section */
.faq-container {
    max-width: 800px;
    margin: 2rem auto;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    padding: 1.5rem;
    background: var(--bg-card);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-question h4 {
    margin: 0;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.125rem;
}

.faq-question i {
    color: var(--primary-color);
    transition: var(--transition);
    font-size: 0.875rem;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===============================================
   RESPONSIVE DESIGN
   =============================================== */
@media (max-width: 1024px) {
    .export-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .steps-grid,
    .features-list,
    .use-cases-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    .features-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .tool-header {
        padding: 2rem 0;
        margin-bottom: 2rem;
    }

    .tool-header h1 {
        font-size: 2.5rem;
        flex-direction: column;
        gap: 0.5rem;
    }

    .tool-header p {
        font-size: 1rem;
    }

    .presets-section,
    .input-section,
    .preview-section,
    .export-section {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .seo-content h2 {
        font-size: 2rem;
        flex-direction: column;
        gap: 0.5rem;
    }

    .preset-categories {
        flex-direction: column;
    }

    .method-tabs {
        flex-direction: column;
        border-bottom: none;
        gap: 0.5rem;
    }

    .tab-btn {
        border-radius: var(--radius-md);
        border: 2px solid var(--border-color);
        margin-bottom: 0;
    }

    .size-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .table-options {
        flex-direction: column;
        gap: 1rem;
    }

    .table-stats {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

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

    .settings-grid {
        grid-template-columns: 1fr;
    }

    .export-actions {
        text-align: center;
    }

    .steps-grid,
    .use-cases-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .step-card,
    .use-case-card {
        padding: 1.5rem;
    }

    .step-number,
    .use-case-icon {
        width: 3rem;
        height: 3rem;
        font-size: 1.25rem;
    }

    .feature-item {
        padding: 1.25rem;
    }

    .feature-item i {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }

    .faq-question {
        padding: 1rem;
    }

    .faq-answer {
        max-height: none;
    }

    .faq-item.active .faq-answer {
        max-height: none;
    }
}

@media (max-width: 480px) {
    .tool-header {
        padding: 1.5rem 0;
    }

    .tool-header h1 {
        font-size: 2rem;
    }

    .seo-content h2 {
        font-size: 1.75rem;
    }

    .presets-section,
    .input-section,
    .preview-section,
    .export-section {
        padding: 1rem;
    }

    .preset-btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }

    .html-textarea {
        min-height: 150px;
        padding: 1rem;
    }

    .file-upload-area {
        padding: 2rem 1rem;
    }

    .upload-icon {
        font-size: 2rem;
    }

    .upload-text h3 {
        font-size: 1rem;
    }

    .builder-controls {
        padding: 1rem;
    }

    .step-card,
    .use-case-card {
        padding: 1rem;
    }

    .step-number,
    .use-case-icon {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }

    .feature-item i {
        width: 2rem;
        height: 2rem;
        font-size: 0.875rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.875rem;
    }

    .btn-large {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
}