/* WebP 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
   =============================================== */
.formats-section,
.upload-section,
.settings-section,
.results-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);
}

.formats-section::before,
.upload-section::before,
.settings-section::before,
.results-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));
}

.formats-section:hover,
.upload-section:hover,
.settings-section:hover,
.results-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 */
.formats-section h2,
.upload-section h2,
.settings-section h2,
.results-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;
}

.formats-section h2 i,
.upload-section h2 i,
.settings-section h2 i,
.results-section h2 i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* ===============================================
   FORMAT SELECTION SECTION
   =============================================== */
.formats-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.format-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.format-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    font-weight: 600;
    position: relative;
    overflow: hidden;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.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 0.5s;
}

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

.format-btn:hover {
    border-color: var(--primary-color);
    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 i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.format-btn span {
    font-weight: 700;
    font-size: 1rem;
}

.format-btn small {
    font-size: 0.8rem;
    opacity: 0.8;
}

.format-preview {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    min-height: 150px;
    transition: var(--transition);
}

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

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

.format-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.detail-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 600;
}

.detail-value {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 600;
}

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

/* ===============================================
   UPLOAD SECTION
   =============================================== */
.upload-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 {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

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

.tab-content {
    display: none;
}

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

/* File Drop Area */
.file-drop-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);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.file-drop-area::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 0.8s;
}

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

.file-drop-area:hover {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.file-drop-area.dragover {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.1);
    transform: scale(1.02);
}

.drop-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

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

.drop-text p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* File Select Area */
.file-select-area {
    text-align: center;
    padding: 2rem;
}

.file-select-area p {
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* URL Input */
.url-input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.url-input-container {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.url-input {
    flex: 1;
    padding: 0.875rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.url-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.url-help {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
    margin: 0;
}

/* Uploaded Files */
.uploaded-files {
    margin-top: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    overflow: hidden;
}

.files-header {
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.files-header h3 {
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 700;
    margin: 0;
}

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

.file-item {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.file-item:last-child {
    border-bottom: none;
}

.file-item:hover {
    background: var(--bg-tertiary);
}

.file-preview {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    object-fit: cover;
    border: 2px solid var(--border-color);
}

.file-details {
    flex: 1;
}

.file-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.file-size {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

/* ===============================================
   SETTINGS SECTION
   =============================================== */
.settings-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

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

.setting-group {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.setting-group::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;
}

.setting-group:hover::before {
    left: 100%;
}

.setting-group:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.setting-group h3 {
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.format-options,
.advanced-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quality-settings {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.setting-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.quality-slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.quality-slider {
    width: 120px;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
}

.quality-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.quality-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

.quality-display {
    font-weight: 700;
    color: var(--primary-color);
    min-width: 50px;
    text-align: center;
}

.quality-presets {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.preset-quality {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.preset-quality:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.preset-quality.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Radio Buttons */
.radio-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
}

.radio-label:hover {
    background: rgba(59, 130, 246, 0.05);
    border-color: var(--primary-color);
}

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

.radio-btn {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
}

.radio-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    opacity: 0;
    transition: var(--transition);
}

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

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

.radio-label input[type="radio"]:checked ~ span {
    color: var(--primary-color);
    font-weight: 600;
}

/* Checkboxes */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
}

.checkbox-label:hover {
    background: rgba(59, 130, 246, 0.05);
    border-color: var(--primary-color);
}

.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;
    transition: var(--transition);
    flex-shrink: 0;
}

.checkmark::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 6px;
    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;
}

.checkbox-label input[type="checkbox"]:checked ~ span {
    color: var(--primary-color);
    font-weight: 600;
}

/* ===============================================
   RESULTS SECTION
   =============================================== */
.results-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.conversion-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    text-align: center;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

.stat-value.error {
    color: var(--error-color);
}

.conversion-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.results-list {
    min-height: 200px;
    max-height: 600px;
    overflow-y: auto;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    text-align: center;
    color: var(--text-muted);
    height: 200px;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.result-item {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    gap: 1rem;
    align-items: center;
}

.result-item:last-child {
    border-bottom: none;
}

.result-item:hover {
    background: var(--bg-tertiary);
}

.result-preview {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    object-fit: cover;
    border: 2px solid var(--border-color);
}

.result-details {
    flex: 1;
}

.result-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.result-info {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.info-item {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.conversion-progress {
    width: 100%;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    transition: width 0.3s ease;
    width: 0%;
}



/* ===============================================
   MODERN BUTTON SYSTEM
   =============================================== */
.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(350px, 1fr));
    gap: 2rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 2rem;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-hover);
}

.feature-item i {
    width: 3.5rem;
    height: 3.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    box-shadow: var(--shadow-lg);
}

.feature-item h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

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

.comparison-table {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin: 2rem 0;
}

.comparison-header {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr 2fr;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    color: white;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 1.5rem 1rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.comparison-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;
}

.comparison-header > div {
    position: relative;
    z-index: 1;
}

.comparison-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr 2fr;
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
    align-items: center;
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-row:hover {
    background: var(--bg-secondary);
}

.format-col {
    text-align: left;
    padding-left: 1rem;
}

.format-col strong {
    display: block;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.format-col small {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.quality-col,
.size-col,
.transparency-col,
.best-for-col {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.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);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.use-case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--success-color), var(--warning-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(--primary-color), var(--info-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

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

.use-case-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

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

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    padding: 1.5rem;
    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-size: 1.125rem;
    font-weight: 600;
}

.faq-question i {
    color: var(--primary-color);
    transition: var(--transition);
}

.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;
}

/* ===============================================
   NOTIFICATION SYSTEM
   =============================================== */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    min-width: 350px;
    max-width: 500px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 1.5rem;
    z-index: 10000;
    transform: translateX(500px);
    opacity: 0;
    transition: all 0.3s ease;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.notification.show {
    transform: translateX(0);
    opacity: 1;
}

.notification.error {
    border-left: 4px solid var(--error-color);
    background: linear-gradient(135deg, var(--bg-card), rgba(239, 68, 68, 0.05));
}

.notification.success {
    border-left: 4px solid var(--success-color);
    background: linear-gradient(135deg, var(--bg-card), rgba(34, 197, 94, 0.05));
}

.notification.warning {
    border-left: 4px solid var(--warning-color);
    background: linear-gradient(135deg, var(--bg-card), rgba(245, 158, 11, 0.05));
}

.notification.info {
    border-left: 4px solid var(--info-color);
    background: linear-gradient(135deg, var(--bg-card), rgba(59, 130, 246, 0.05));
}

.notification-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: white;
    flex-shrink: 0;
    margin-top: 2px;
}

.notification.error .notification-icon {
    background: var(--error-color);
}

.notification.success .notification-icon {
    background: var(--success-color);
}

.notification.warning .notification-icon {
    background: var(--warning-color);
}

.notification.info .notification-icon {
    background: var(--info-color);
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.notification-message {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
    margin: 0;
}

.notification-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
    flex-shrink: 0;
}

.notification-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.notification-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color));
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    transition: width 0.1s linear;
}

/* ===============================================
   RESPONSIVE DESIGN
   =============================================== */
@media (max-width: 1024px) {
    .setting-groups {
        grid-template-columns: 1fr;
    }
    
    .format-categories {
        grid-template-columns: repeat(2, 1fr);
    }

    .url-input-container {
        flex-direction: column;
    }

    .features-list {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .comparison-header,
    .comparison-row {
        grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
        font-size: 0.8rem;
        padding: 1rem 0.5rem;
    }

    .use-cases-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .tool-header {
        padding: 2rem 1rem;
        margin-bottom: 2rem;
    }

    .tool-header h1 {
        font-size: 2.25rem;
        flex-direction: column;
        gap: 0.5rem;
    }

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

    .formats-section,
    .upload-section,
    .settings-section,
    .results-section {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }

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

    .format-categories {
        grid-template-columns: 1fr;
    }

    .method-tabs {
        flex-direction: column;
    }

    .tab-btn {
        border-radius: var(--radius-lg);
        margin-bottom: 0.5rem;
    }

    .conversion-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

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

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    .file-item {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .file-preview {
        align-self: center;
    }

    .result-item {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .result-preview {
        align-self: center;
    }

    .feature-item {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .feature-item i {
        align-self: center;
    }

    .comparison-table {
        font-size: 0.75rem;
    }

    .comparison-header,
    .comparison-row {
        grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
        padding: 0.75rem 0.25rem;
        font-size: 0.7rem;
    }

    .format-col {
        padding-left: 0.5rem;
    }

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

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

    .use-case-icon {
        width: 3rem;
        height: 3rem;
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .tool-header {
        padding: 1.5rem 1rem;
    }
    
    .tool-header h1 {
        font-size: 1.875rem;
    }

    .seo-content h2 {
        font-size: 1.5rem;
    }

    .formats-section,
    .upload-section,
    .settings-section,
    .results-section {
        padding: 1rem;
    }

    .format-btn {
        padding: 1rem;
    }

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

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

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

    .conversion-stats {
        grid-template-columns: 1fr;
    }

    .step-card {
        padding: 1.5rem;
    }

    .step-number {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }

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

    .btn-large {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }

    .notification {
        top: 10px;
        right: 10px;
        left: 10px;
        min-width: auto;
        max-width: none;
        padding: 1rem;
    }

    .notification-title {
        font-size: 0.9rem;
    }

    .notification-message {
        font-size: 0.8rem;
    }
}