/* ============================================
   HEIC to ICO Converter - Modern Stylesheet
   Purple/Magenta Color Theme for ConvertICO
   Dark Mode Compatible
   ============================================ */

/* CSS Variables - Light Mode (Default) */
:root {
    --transition-speed: 0.25s;
    
    /* Primary Colors - Purple Theme */
    --primary: #9333EA;
    --primary-light: #F3E8FF;
    --primary-dark: #7C3AED;
    --accent: #A855F7;
    --success: #10B981;
    --success-light: #D1FAE5;
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --danger: #EF4444;
    --danger-light: #FEE2E2;
    
    /* Preset Colors */
    --favicon: #9333EA;
    --desktop: #7C3AED;
    --modern: #A855F7;
    
    /* Background Colors */
    --bg: #f8fafc;
    --bg-elevated: #ffffff;
    --bg-secondary: #f1f5f9;
    --bg-tertiary: #e2e8f0;
    
    /* Text Colors */
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    /* Border Colors */
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    --shadow-primary: 0 4px 14px rgba(147, 51, 234, 0.3);
    --shadow-primary-hover: 0 6px 20px rgba(147, 51, 234, 0.4);
    
    /* Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Checkerboard for transparency */
    --checker-color: #e5e7eb;
    
    /* Scrollbar */
    --scrollbar-track: var(--bg);
    --scrollbar-thumb: var(--text-muted);
    --scrollbar-thumb-hover: var(--text-secondary);
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --primary: #a855f7;
    --primary-light: rgba(168, 85, 247, 0.15);
    --primary-dark: #9333ea;
    --accent: #c084fc;
    --success: #4ade80;
    --success-light: rgba(74, 222, 128, 0.15);
    --warning: #fbbf24;
    --warning-light: rgba(251, 191, 36, 0.15);
    --danger: #f87171;
    --danger-light: rgba(248, 113, 113, 0.15);
    
    /* Preset Colors - Brighter for dark */
    --favicon: #a855f7;
    --desktop: #9333ea;
    --modern: #c084fc;
    
    /* Background Colors */
    --bg: #0f172a;
    --bg-elevated: #1e293b;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;
    
    /* Text Colors */
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Border Colors */
    --border: #334155;
    --border-light: #475569;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5);
    --shadow-primary: 0 4px 14px rgba(168, 85, 247, 0.25);
    --shadow-primary-hover: 0 6px 20px rgba(168, 85, 247, 0.35);
    
    /* Checkerboard for transparency */
    --checker-color: #374151;
    
    /* Scrollbar */
    --scrollbar-track: var(--bg-elevated);
    --scrollbar-thumb: var(--text-muted);
    --scrollbar-thumb-hover: var(--text-secondary);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* 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: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-lg);
    flex-shrink: 0;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.tool-icon-wrapper svg,
.tool-icon-wrapper i {
    width: 32px;
    height: 32px;
}

.tool-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin: 0;
    color: var(--primary);
    letter-spacing: -0.02em;
    transition: color var(--transition-speed);
}

.tool-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
    transition: color var(--transition-speed);
}

/* 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;
    transition: background-color var(--transition-speed), border-color var(--transition-speed), box-shadow var(--transition-speed);
}

/* 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: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(147, 51, 234, 0.05);
    opacity: 0;
    transition: opacity 0.3s ease;
}

[data-theme="dark"] .upload-area::before {
    background: rgba(168, 85, 247, 0.08);
}

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

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

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

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

.upload-icon svg,
.upload-icon i {
    width: 64px;
    height: 64px;
}

.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;
    transition: color var(--transition-speed);
}

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

.upload-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-elevated);
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    border: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed), color var(--transition-speed);
}

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

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

/* File Info Bar */
.file-info-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 1.25rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.file-info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color var(--transition-speed);
}

.file-info-item svg,
.file-info-item i {
    color: var(--primary);
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    transition: color var(--transition-speed);
}

.file-info-apple {
    background: var(--primary-light);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    color: var(--primary);
    font-weight: 500;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Editor Grid */
.editor-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

/* Panels */
.preview-panel,
.controls-panel {
    padding: 2rem;
}

.preview-panel {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.controls-panel {
    background: var(--bg-elevated);
    transition: background-color var(--transition-speed);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.panel-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
    transition: color var(--transition-speed);
}

.panel-header h3 svg,
.panel-header h3 i {
    color: var(--primary);
    width: 20px;
    height: 20px;
    transition: color var(--transition-speed);
}

/* Image Preview */
.image-preview-container {
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-preview {
    background: var(--bg-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 100%;
    overflow: hidden;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.image-preview img {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.preview-hint {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--primary);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.preview-hint svg,
.preview-hint i {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

/* Control Sections */
.control-section {
    margin-bottom: 1.5rem;
}

.section-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.75rem;
    transition: color var(--transition-speed);
}

.section-label svg,
.section-label i {
    width: 16px;
    height: 16px;
    color: var(--primary);
    transition: color var(--transition-speed);
}

.label-hint {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Standard Sizes Grid */
.standard-sizes-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.size-checkbox {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.625rem 0.5rem;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.8rem;
}

.size-checkbox:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.size-checkbox:has(input:checked) {
    border-color: var(--primary);
    background: var(--primary-light);
}

.size-checkbox input[type="checkbox"] {
    width: 14px;
    height: 14px;
    accent-color: var(--primary);
}

.size-label {
    font-weight: 500;
    color: var(--text);
    transition: color var(--transition-speed);
}

/* Size Presets */
.sizes-presets {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.preset-btn {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.preset-btn svg,
.preset-btn i {
    width: 14px;
    height: 14px;
}

/* Quality Slider */
.quality-slider-wrapper {
    padding: 0.5rem 0;
}

.quality-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(to right, var(--warning), var(--success), var(--primary));
    outline: none;
    opacity: 0.85;
    transition: opacity 0.2s;
}

.quality-slider:hover {
    opacity: 1;
}

.quality-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease;
}

.quality-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.quality-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.quality-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.quality-labels span:nth-child(2) {
    font-weight: 600;
    color: var(--primary);
}

/* Options Grid */
.options-grid,
.heic-options-grid {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.625rem 0.875rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    color: var(--text);
}

.checkbox-option:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

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

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

.checkbox-option .option-icon {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    flex-shrink: 0;
    transition: color var(--transition-speed);
}

.checkbox-option:has(input:checked) .option-icon {
    color: var(--primary);
}

/* Option Row */
.option-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.option-row label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    min-width: 110px;
    transition: color var(--transition-speed);
}

.option-row label svg,
.option-row label i {
    width: 16px;
    height: 16px;
    color: var(--primary);
    transition: color var(--transition-speed);
}

.styled-dropdown {
    flex: 1;
    padding: 0.625rem 0.875rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background-color: var(--bg-elevated);
    color: var(--text);
    font-size: 0.85rem;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    cursor: pointer;
    transition: all 0.2s ease;
}

[data-theme="dark"] .styled-dropdown {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2394a3b8' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
}

.styled-dropdown:hover {
    border-color: var(--primary);
}

.styled-dropdown:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(147, 51, 234, 0.15);
}

[data-theme="dark"] .styled-dropdown:focus {
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.2);
}

/* Action Bar */
.action-bar {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn svg,
.btn i {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary-hover);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-lg svg,
.btn-lg i {
    width: 22px;
    height: 22px;
}

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

.btn-secondary:hover {
    background: var(--bg);
    color: var(--text);
    border-color: var(--text-muted);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

/* Processing Overlay */
.processing-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(4px);
}

[data-theme="dark"] .processing-overlay {
    background: rgba(15, 23, 42, 0.95);
}

.processing-content {
    text-align: center;
    padding: 2rem;
}

.processing-spinner {
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.processing-spinner svg,
.processing-spinner i {
    width: 48px;
    height: 48px;
}

.processing-spinner .spin {
    animation: spin 1s linear infinite;
}

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

.processing-status {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text);
    margin: 0 0 1.5rem;
    transition: color var(--transition-speed);
}

.progress-bar-container {
    width: 300px;
    max-width: 100%;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin: 0 auto 0.75rem;
    transition: background-color var(--transition-speed);
}

.progress-bar {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 4px;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    transition: color var(--transition-speed);
}

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

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

.success-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--success-light);
    border-radius: var(--radius-full);
    color: var(--success);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.success-badge svg,
.success-badge i {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
}

.success-badge h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.results-info {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 2rem;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
    transition: background-color var(--transition-speed);
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.625rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
    transition: border-color var(--transition-speed);
}

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

.info-row span:first-child {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    transition: color var(--transition-speed);
}

.info-row span:last-child {
    font-weight: 600;
    color: var(--text);
    transition: color var(--transition-speed);
}

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

/* Error Message */
.error-message {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.5rem 2rem;
    padding: 1rem 1.25rem;
    background: var(--danger-light);
    border: 1px solid var(--danger);
    border-radius: var(--radius-md);
    color: var(--danger);
    font-size: 0.95rem;
    transition: background-color var(--transition-speed), border-color var(--transition-speed), color var(--transition-speed);
}

.error-message svg,
.error-message i {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

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

.related-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text);
    font-size: 0.9rem;
    transition: color var(--transition-speed);
}

.related-label svg,
.related-label i {
    color: var(--primary);
    transition: color var(--transition-speed);
}

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

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
}

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

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

/* Info Sections */
.info-sections {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 2rem;
}

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

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

.info-card h2 svg,
.info-card h2 i {
    color: var(--primary);
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    transition: color var(--transition-speed);
}

.info-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0 0 1rem;
    transition: color var(--transition-speed);
}

.info-card p:last-child {
    margin-bottom: 0;
}

.info-card p a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dotted var(--primary);
    transition: color var(--transition-speed);
}

.info-card p a:hover {
    border-bottom-style: solid;
}

/* 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: 1.5rem;
    counter-increment: step;
}

.steps-list li:not(:last-child)::after {
    content: '';
    position: absolute;
    left: calc(1rem - 1px);
    top: 2.5rem;
    bottom: 0;
    width: 2px;
    background: var(--primary-light);
    transition: background-color var(--transition-speed);
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--primary);
    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;
    transition: background-color var(--transition-speed);
}

.step-content strong {
    display: block;
    color: var(--text);
    margin-bottom: 0.25rem;
    transition: color var(--transition-speed);
}

.step-content p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 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;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.mode-tag.favicon {
    background: var(--favicon);
}

.mode-tag.desktop {
    background: var(--desktop);
}

.mode-tag.modern {
    background: var(--modern);
}

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

/* Use Cases Tip */
.use-cases-tip {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    padding: 1rem 1.25rem;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    border: 1px solid var(--primary);
    margin-top: 0;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.use-cases-tip svg,
.use-cases-tip i {
    color: var(--primary);
    flex-shrink: 0;
    margin-top: 2px;
    width: 18px;
    height: 18px;
    transition: color var(--transition-speed);
}

.use-cases-tip span {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    transition: color var(--transition-speed);
}

.use-cases-tip a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.use-cases-tip a:hover {
    text-decoration: underline;
}

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

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

.faq-question {
    width: 100%;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    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);
}

.faq-question svg,
.faq-question i {
    color: var(--primary);
    transition: transform 0.3s ease, color var(--transition-speed);
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

.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);
    transition: background-color var(--transition-speed);
}

.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: 900px) {
    .editor-grid {
        grid-template-columns: 1fr;
    }
    
    .preview-panel {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    
    .file-info-bar {
        justify-content: center;
    }
    
    .standard-sizes-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@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;
    }
    
    .preview-panel,
    .controls-panel {
        padding: 1.5rem;
    }
    
    .standard-sizes-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .sizes-presets {
        flex-wrap: wrap;
    }
    
    .action-bar {
        flex-direction: column;
        padding: 1.5rem;
    }
    
    .btn {
        width: 100%;
    }
    
    .related-tools {
        flex-direction: column;
        text-align: center;
    }
    
    .related-links {
        justify-content: center;
    }
    
    .mode-explain {
        flex-direction: column;
    }
    
    .option-row {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    
    .option-row label {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .tool-title {
        font-size: 1.5rem;
    }
    
    .file-info-bar {
        flex-direction: column;
        gap: 0.75rem;
        align-items: flex-start;
    }
    
    .steps-list li {
        padding-left: 3rem;
    }
    
    .progress-bar-container {
        width: 100%;
    }
    
    .results-actions {
        flex-direction: column;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* Selection */
::selection {
    background: rgba(147, 51, 234, 0.2);
    color: var(--text);
}

[data-theme="dark"] ::selection {
    background: rgba(168, 85, 247, 0.3);
}

/* 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;
    }
}