/* ============================================
   GIF to Animated AVIF Converter - Stylesheet
   Coral/Orange Color Theme
   ============================================ */

/* CSS Variables - Coral/Orange Theme */
:root {
    --primary: #F97316;
    --primary-light: #FFF7ED;
    --primary-dark: #EA580C;
    --accent: #FB923C;
    --accent-light: #FFEDD5;
    --success: #10B981;
    --success-light: #D1FAE5;
    --warning: #F59E0B;
    --danger: #EF4444;
    
    --bg: #FFFBF5;
    --bg-elevated: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #FED7AA;
    
    --shadow-sm: 0 1px 3px rgba(249, 115, 22, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(249, 115, 22, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(249, 115, 22, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(249, 115, 22, 0.1);
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--bg) 0%, #FEF3C7 100%);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

/* Container */
.tool-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.tool-header {
    text-align: center;
    margin-bottom: 2rem;
}

.tool-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.tool-icon-wrapper {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-lg), 0 0 40px rgba(249, 115, 22, 0.2);
    flex-shrink: 0;
}

.tool-icon-wrapper svg,
.tool-icon-wrapper i {
    width: 28px;
    height: 28px;
}

.tool-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin: 0;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.tool-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Main Tool Area */
.tool-main {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--border);
    position: relative;
}

/* Upload Section */
.upload-section {
    padding: 3rem;
}

.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #FEFFFE 0%, var(--bg) 100%);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.05), rgba(251, 146, 60, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.upload-area:hover,
.upload-area.dragover,
.upload-area.active {
    border-color: var(--primary);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.upload-area:hover::before,
.upload-area.dragover::before,
.upload-area.active::before {
    opacity: 1;
}

.upload-content {
    position: relative;
    z-index: 1;
}

.upload-icon {
    color: var(--primary);
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease;
}

.upload-area:hover .upload-icon {
    transform: translateY(-5px);
}

.upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 0.5rem;
}

.upload-subtitle {
    color: var(--text-secondary);
    margin: 0 0 1.5rem;
    font-size: 1rem;
}

.btn-browse {
    margin-bottom: 1.5rem;
}

.upload-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
}

.upload-hint i,
.upload-hint svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    box-shadow: 0 4px 15px rgba(249, 115, 22, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(249, 115, 22, 0.4);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

/* Editor Section */
.editor-section {
    padding: 0;
    animation: fadeIn 0.4s ease;
}

/* File Info Panel */
.file-info-panel {
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, var(--bg) 0%, var(--primary-light) 100%);
    border-bottom: 1px solid var(--border);
}

.panel-header {
    margin-bottom: 1rem;
}

.panel-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.panel-header h3 svg,
.panel-header h3 i {
    color: var(--primary);
}

.file-details {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.file-preview-box {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    background: 
        linear-gradient(45deg, #f0f0f0 25%, transparent 25%),
        linear-gradient(-45deg, #f0f0f0 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #f0f0f0 75%),
        linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
    background-size: 10px 10px;
    background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
    background-color: white;
    overflow: hidden;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
}

.file-preview-box img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.file-info-content {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 600;
    color: var(--text);
    font-size: 1.1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.5rem;
}

.file-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.file-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

/* Settings Panel */
.settings-panel {
    padding: 2rem;
}

/* Options Grid */
.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.option-card {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.option-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.option-header i,
.option-header svg {
    color: var(--primary);
}

.option-header h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

/* Mode Options */
.mode-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.mode-option {
    cursor: pointer;
}

.mode-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.mode-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 0.5rem;
    background: var(--bg-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    text-align: center;
}

.mode-option input:checked + .mode-box {
    border-color: var(--primary);
    background: var(--primary-light);
}

.mode-box i,
.mode-box svg {
    color: var(--text-muted);
    transition: color 0.2s ease;
}

.mode-option input:checked + .mode-box i,
.mode-option input:checked + .mode-box svg {
    color: var(--primary);
}

.mode-name {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text);
}

.mode-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Quality Slider */
.quality-card {
    transition: opacity 0.3s ease;
}

.quality-card.disabled {
    opacity: 0.5;
    pointer-events: none;
}

.quality-slider-container {
    padding: 0.5rem 0;
}

.quality-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(to right, var(--success), var(--warning), var(--danger));
    outline: none;
    margin: 0.75rem 0;
}

.quality-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: all 0.2s ease;
}

.quality-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.quality-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.quality-value {
    text-align: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.quality-presets {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.preset-btn {
    flex: 1;
    padding: 0.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.preset-btn:hover,
.preset-btn.active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

/* Speed Options */
.speed-options {
    display: flex;
    gap: 0.5rem;
}

.speed-option {
    flex: 1;
    cursor: pointer;
}

.speed-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.speed-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem 0.5rem;
    background: var(--bg-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.speed-option input:checked + .speed-box {
    border-color: var(--primary);
    background: var(--primary-light);
}

.speed-box i,
.speed-box svg {
    color: var(--text-muted);
}

.speed-option input:checked + .speed-box i,
.speed-option input:checked + .speed-box svg {
    color: var(--primary);
}

.speed-name {
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text);
}

/* Checkbox Options */
.checkbox-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.checkbox-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.checkbox-mark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.checkbox-option input:checked + .checkbox-mark {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-option input:checked + .checkbox-mark::after {
    content: '';
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    margin-bottom: 2px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text);
}

.checkbox-label i,
.checkbox-label svg {
    color: var(--text-muted);
    width: 16px;
    height: 16px;
}

/* Action Bar */
.action-bar {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 2rem;
    background: var(--bg);
    border-top: 1px solid var(--border);
}

/* Progress Container */
.progress-container {
    padding: 1.5rem 2rem;
    background: var(--primary-light);
    border-top: 1px solid var(--border);
}

.progress-bar {
    height: 8px;
    background: rgba(249, 115, 22, 0.2);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    text-align: center;
    font-size: 0.9rem;
    color: var(--primary-dark);
    font-weight: 500;
}

/* ============================================
   PROCESSING OVERLAY - Full screen overlay
   ============================================ */
.processing-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.processing-overlay.active {
    opacity: 1;
    visibility: visible;
}

.processing-modal {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: 3rem;
    max-width: 420px;
    width: 90%;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.processing-overlay.active .processing-modal {
    transform: translateY(0) scale(1);
}

/* Spinner Container */
.processing-spinner {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 2rem;
}

/* Outer rotating ring */
.spinner-ring {
    position: absolute;
    inset: 0;
    border: 4px solid transparent;
    border-top-color: var(--primary);
    border-right-color: var(--accent);
    border-radius: 50%;
    animation: spin 1.2s linear infinite;
}

/* Inner ring (rotates opposite direction) */
.spinner-ring-inner {
    position: absolute;
    inset: 12px;
    border: 3px solid transparent;
    border-bottom-color: var(--primary-dark);
    border-left-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite reverse;
}

/* Center icon */
.spinner-icon {
    position: absolute;
    inset: 28px;
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse 2s ease-in-out infinite;
}

.spinner-icon i,
.spinner-icon svg {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(0.9); opacity: 0.8; }
}

/* Processing Text */
.processing-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 0.5rem;
}

.processing-message {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0 0 1.5rem;
    min-height: 1.5em;
}

/* Processing Progress Bar */
.processing-progress {
    background: var(--bg);
    border-radius: var(--radius-full);
    height: 12px;
    overflow: hidden;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
}

.processing-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
    background-size: 200% 100%;
    animation: shimmer 2s linear infinite;
    border-radius: var(--radius-full);
    transition: width 0.4s ease;
    width: 0%;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.processing-percent {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0;
}

/* Success State */
.processing-success {
    display: none;
    flex-direction: column;
    align-items: center;
}

.processing-overlay.success .processing-spinner,
.processing-overlay.success .processing-progress,
.processing-overlay.success .processing-percent {
    display: none;
}

.processing-overlay.success .processing-success {
    display: flex;
}

.success-icon-wrapper {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--success), #059669);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    animation: scaleIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.success-icon-wrapper i,
.success-icon-wrapper svg {
    width: 40px;
    height: 40px;
    color: white;
}

@keyframes scaleIn {
    from { transform: scale(0); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.success-stats {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

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

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

.success-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Results Section */
.results-section {
    padding: 3rem;
    animation: fadeIn 0.4s ease;
}

.results-header {
    text-align: center;
    margin-bottom: 2rem;
}

.results-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, var(--success), #059669);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.results-icon i,
.results-icon svg {
    width: 36px;
    height: 36px;
    color: white;
}

.results-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 0.5rem;
}

.results-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Results Stats */
.results-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-box {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 1.25rem 2rem;
    text-align: center;
    border: 1px solid var(--border);
    min-width: 120px;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

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

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

.stat-arrow {
    color: var(--text-muted);
}

/* Preview Comparison */
.preview-comparison {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.preview-box {
    flex: 1;
    max-width: 280px;
}

.preview-box h4 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 0.75rem;
}

.preview-box h4 i,
.preview-box h4 svg {
    width: 16px;
    height: 16px;
}

.preview-image-container {
    background: 
        linear-gradient(45deg, #f0f0f0 25%, transparent 25%),
        linear-gradient(-45deg, #f0f0f0 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #f0f0f0 75%),
        linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
    background-color: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    overflow: hidden;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-image-container img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* Conversion Details */
.conversion-details {
    display: flex;
    justify-content: center;
    gap: 2rem;
    padding: 1rem;
    background: var(--bg);
    border-radius: var(--radius-md);
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.conversion-details span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Results Actions */
.results-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

/* Error Message */
.error {
    margin: 1rem 2rem;
    padding: 1rem 1.5rem;
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: var(--radius-md);
    color: var(--danger);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.error i,
.error svg {
    flex-shrink: 0;
}

/* Related Tools */
.related-tools {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2rem 0;
    padding: 1.25rem 1.5rem;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    flex-wrap: wrap;
}

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

.related-links {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--bg);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--border);
}

.related-link:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

.related-link svg,
.related-link i {
    flex-shrink: 0;
}

/* Info Sections */
.info-sections {
    display: grid;
    gap: 2rem;
    margin-top: 3rem;
}

.info-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.info-card h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.35rem;
    color: var(--text);
    margin: 0 0 1.5rem;
}

.info-card h2 svg,
.info-card h2 i {
    color: var(--primary);
    flex-shrink: 0;
}

/* Steps List */
.steps-list {
    list-style: none;
    padding: 0;
    margin: 0;
    counter-reset: step;
}

.steps-list li {
    position: relative;
    padding-left: 3.5rem;
    padding-bottom: 1.25rem;
    counter-increment: step;
    color: var(--text-secondary);
    line-height: 1.6;
}

.steps-list li:not(:last-child)::after {
    content: '';
    position: absolute;
    left: calc(1rem - 1px);
    top: 2rem;
    bottom: 0;
    width: 2px;
    background: var(--primary-light);
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    z-index: 1;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.benefit-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.benefit-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.benefit-icon i,
.benefit-icon svg {
    color: var(--primary);
}

.benefit-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 0.5rem;
}

.benefit-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* Mode Explanations */
.mode-explanations {
    display: grid;
    gap: 1rem;
}

.mode-explain {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.mode-tag {
    flex-shrink: 0;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    color: white;
}

.mode-tag.lossy {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.mode-tag.lossless {
    background: linear-gradient(135deg, var(--success), #059669);
}

.mode-tag.crf {
    background: linear-gradient(135deg, var(--accent), #EA580C);
}

.mode-explain p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* FAQ */
.faq-list {
    display: grid;
    gap: 0.75rem;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1rem 1.25rem;
    background: var(--bg);
    border: none;
    text-align: left;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s ease;
}

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

.faq-question svg,
.faq-question i {
    color: var(--primary);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

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

.faq-answer {
    display: none;
    padding: 0 1.25rem 1rem;
    background: var(--bg-elevated);
}

.faq-item.open .faq-answer {
    display: block;
}

.faq-answer p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-answer a {
    color: var(--primary);
    text-decoration: none;
}

.faq-answer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .tool-container {
        padding: 1rem;
    }
    
    .tool-title-row {
        flex-direction: row;
        gap: 0.75rem;
    }
    
    .tool-icon-wrapper {
        width: 48px;
        height: 48px;
    }
    
    .tool-icon-wrapper svg,
    .tool-icon-wrapper i {
        width: 24px;
        height: 24px;
    }
    
    .upload-section,
    .results-section {
        padding: 2rem 1.5rem;
    }
    
    .upload-area {
        padding: 2.5rem 1.5rem;
    }
    
    .settings-panel {
        padding: 1.5rem;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .mode-options {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .action-bar {
        flex-direction: column;
        padding: 1.5rem;
    }
    
    .btn {
        width: 100%;
    }
    
    .file-details {
        flex-direction: column;
        text-align: center;
    }
    
    .file-meta {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .results-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .stat-arrow {
        transform: rotate(90deg);
    }
    
    .preview-comparison {
        flex-direction: column;
        align-items: center;
    }
    
    .related-tools {
        flex-direction: column;
        text-align: center;
    }
    
    .related-links {
        justify-content: center;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .mode-explain {
        flex-direction: column;
    }
    
    .browser-support {
        flex-direction: column;
        text-align: center;
    }
    
    .processing-modal {
        padding: 2rem 1.5rem;
    }
    
    .processing-spinner {
        width: 100px;
        height: 100px;
    }
    
    .spinner-icon {
        inset: 24px;
    }
    
    .spinner-icon i,
    .spinner-icon svg {
        width: 26px;
        height: 26px;
    }
    
    .success-stats {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .tool-title {
        font-size: 1.5rem;
    }
    
    .mode-options {
        grid-template-columns: 1fr;
    }
    
    .speed-options {
        flex-direction: column;
    }
    
    .quality-presets {
        flex-wrap: wrap;
    }
    
    .preset-btn {
        flex: 0 0 calc(50% - 0.25rem);
    }
    
    .file-preview-box {
        width: 60px;
        height: 60px;
    }
    
    .steps-list li {
        padding-left: 3rem;
    }
}

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

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    
    .processing-progress-bar {
        animation: none;
        background: var(--primary);
    }
    
    .spinner-ring,
    .spinner-ring-inner {
        animation: none;
    }
}