/* ============================================
   Image Enhancer - Modern Stylesheet
   Purple/Violet Color Theme for ConvertICO
   With Dark Mode Support
   ============================================ */

/* CSS Variables - Light Mode (Default) */
:root {
    --transition-speed: 0.25s;
    
    /* Primary Colors - Purple/Violet Theme */
    --primary: #8B5CF6;
    --primary-light: #EDE9FE;
    --primary-dark: #7C3AED;
    --accent: #A78BFA;
    --success: #10B981;
    --success-light: #D1FAE5;
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --danger: #EF4444;
    --danger-light: #FEE2E2;
    
    /* Mode Tag Colors */
    --mode-auto: #8B5CF6;
    --mode-portrait: #EC4899;
    --mode-landscape: #10B981;
    --mode-lowlight: #F59E0B;
    
    /* Adjustment Tag Colors */
    --adjust-light: #F59E0B;
    --adjust-color: #8B5CF6;
    --adjust-detail: #0891B2;
    
    /* Background Colors */
    --bg: #f8fafc;
    --bg-elevated: #ffffff;
    --bg-secondary: #f1f5f9;
    
    /* 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);
    
    /* Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Upload area */
    --upload-bg: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
    --upload-hover-bg: linear-gradient(135deg, #faf5ff 0%, #ede9fe 100%);
    
    /* Checkerboard */
    --checker-light: #f0f0f0;
    --checker-dark: #e0e0e0;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --primary: #A78BFA;
    --primary-light: rgba(167, 139, 250, 0.15);
    --primary-dark: #8B5CF6;
    --accent: #C4B5FD;
    --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);
    
    --bg: #0f172a;
    --bg-elevated: #1e293b;
    --bg-secondary: #334155;
    
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border: #334155;
    --border-light: #475569;
    
    --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);
    
    --upload-bg: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    --upload-hover-bg: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(167, 139, 250, 0.2) 100%);
    
    --checker-light: #334155;
    --checker-dark: #475569;
}

/* 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);
}

.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;
}

.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);
}

.tool-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 800px;
    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;
    transition: background-color var(--transition-speed), border-color 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(--upload-bg);
    position: relative;
    overflow: hidden;
}

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

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

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

.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;
}

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

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

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

/* 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);
}

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

/* Editor Grid - Stacked Layout */
.editor-grid { 
    display: flex; 
    flex-direction: column;
    gap: 0; 
}

.preview-panel, 
.settings-panel { 
    padding: 2rem; 
}

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

.settings-panel {
    background: var(--bg-elevated);
}

/* Settings Grid for wider layout */
@media (min-width: 768px) {
    .settings-panel {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem 2rem;
        align-items: start;
    }
    
    .settings-panel .panel-header {
        grid-column: 1 / -1;
    }
    
    .settings-panel .manual-section {
        grid-column: 1 / -1;
    }
    
    .settings-panel .output-section {
        grid-column: 1 / -1;
    }
}

.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;
}

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

/* Preview Toggles */
.preview-toggles {
    display: flex;
    gap: 0.5rem;
}

.toggle-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.toggle-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.toggle-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.toggle-btn svg,
.toggle-btn i {
    width: 16px;
    height: 16px;
}

/* Preview Container */
.preview-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 350px;
}

.preview-image-wrapper {
    position: relative;
    display: inline-block;
    max-width: 100% !important;
	max-height: 100% !important;
    background-image: 
        linear-gradient(45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-light) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-light) 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
}

#previewCanvas,
#originalPreview {
    display: block;
    max-width: 100%;
    max-height: 500px;
}

/* Comparison Slider */
.comparison-slider {
    margin-top: 1.5rem;
}

.comparison-container {
    position: relative;
    display: inline-block;
    max-width: 100%;
    margin: 0 auto;
    overflow: hidden;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background-image: 
        linear-gradient(45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-light) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-light) 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

.comparison-wrapper {
    display: flex;
    justify-content: center;
}

.comparison-after {
    position: relative;
    display: block;
}

.comparison-after canvas {
    display: block;
    max-width: 100%;
    max-height: 500px;
}

.comparison-before {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    clip-path: inset(0 50% 0 0);
    overflow: hidden;
}

.comparison-before img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.comparison-label {
    position: absolute;
    bottom: 10px;
    padding: 0.35rem 0.75rem;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.comparison-before .comparison-label {
    left: 10px;
}

.comparison-after .comparison-label {
    right: 10px;
}

.comparison-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background: white;
    cursor: ew-resize;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transform: translateX(-50%);
}

.handle-line {
    flex: 1;
    width: 2px;
    background: white;
}

.handle-circle {
    width: 40px;
    height: 40px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    color: var(--text);
}

.handle-circle svg,
.handle-circle i {
    width: 20px;
    height: 20px;
}

/* 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;
}

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

/* Section Header with Reset */
.section-header-with-reset {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.section-header-with-reset .section-label {
    margin-bottom: 0;
}

.reset-adjustments-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.75rem;
    background: var(--bg-secondary);
    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;
}

.reset-adjustments-btn:hover {
    background: var(--danger-light);
    border-color: var(--danger);
    color: var(--danger);
}

.reset-adjustments-btn svg,
.reset-adjustments-btn i {
    width: 12px;
    height: 12px;
}

/* Mode Grid */
.mode-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.mode-option input {
    display: none;
}

.mode-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    padding: 1rem 0.5rem;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.mode-card svg,
.mode-card i {
    width: 24px;
    height: 24px;
    color: var(--text-muted);
}

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

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

.mode-option:hover .mode-card {
    border-color: var(--primary);
}

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

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

/* Presets Grid */
.presets-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.preset-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    padding: 0.75rem 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;
    font-weight: 500;
    color: var(--text-secondary);
}

.preset-icon {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
}

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

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

/* Adjustments Grid */
.adjustments-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.adjustment-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.group-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.adjustment-row {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.adjustment-row label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.adjustment-row label svg,
.adjustment-row label i {
    width: 14px;
    height: 14px;
    color: var(--primary);
}

.slider-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.slider-wrapper input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--border);
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s ease;
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.slider-wrapper input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

.slider-value {
    min-width: 36px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-align: right;
}

/* Output Settings */
.output-row {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.output-format,
.output-quality {
    flex: 1;
    min-width: 200px;
}

.output-format label,
.output-quality label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.output-format select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.output-format select:focus {
    outline: none;
    border-color: var(--primary);
}

.quality-slider {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.quality-slider input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: var(--radius-full);
    background: linear-gradient(to right, var(--warning), var(--success));
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.quality-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 2px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.quality-slider span {
    min-width: 40px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
}

/* Action Bar */
.action-bar {
    display: flex;
    justify-content: center;
    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 1.75rem;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-decoration: none;
}

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

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 14px rgba(139, 92, 246, 0.35);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.45);
}

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

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

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

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

/* Processing Overlay */
.processing-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.processing-content {
    background: var(--bg-elevated);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-xl);
}

.processing-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto 1.25rem;
    animation: spin 1s linear infinite;
}

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

.processing-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

/* Error Message */
.error-message {
    background: var(--danger-light);
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin: 1.25rem;
    font-weight: 500;
}

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

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

.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    text-decoration: none;
    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 {
    width: 16px;
    height: 16px;
}

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

.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: 1.3rem;
    color: var(--text);
    margin: 0 0 1.5rem 0;
}

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

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

.steps-list li {
    position: relative;
    padding-left: 3.5rem;
    padding-bottom: 1.25rem;
    counter-increment: step;
}

.steps-list li:last-child {
    padding-bottom: 0;
}

.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: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    z-index: 1;
}

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

.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;
    min-width: 80px;
    text-align: center;
}

.mode-tag.auto { background: var(--mode-auto); }
.mode-tag.portrait { background: var(--mode-portrait); }
.mode-tag.landscape { background: var(--mode-landscape); }
.mode-tag.lowlight { background: var(--mode-lowlight); }

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

/* Adjustment Explanations */
.adjustment-explanations {
    display: grid;
    gap: 1rem;
}

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

.adjust-tag {
    flex-shrink: 0;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    color: white;
    min-width: 90px;
    text-align: center;
}

.adjust-tag.light { background: var(--adjust-light); }
.adjust-tag.color { background: var(--adjust-color); }
.adjust-tag.detail { background: var(--adjust-detail); }

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

.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;
    width: 20px;
    height: 20px;
}

.faq-item.active .faq-question svg,
.faq-item.active .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.active .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) {
    .mode-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .presets-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .adjustments-grid {
        grid-template-columns: 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 {
        padding: 2rem 1.5rem;
    }
    
    .preview-panel,
    .settings-panel {
        padding: 1.5rem;
    }
    
    .panel-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .preview-toggles {
        width: 100%;
        justify-content: center;
    }
    
    .mode-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .presets-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .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,
    .adjust-explain {
        flex-direction: column;
    }
    
    .output-row {
        flex-direction: column;
    }
    
    .output-format,
    .output-quality {
        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;
    }
    
    .toggle-btn span {
        display: none;
    }
    
    .toggle-btn {
        padding: 0.5rem 0.75rem;
    }
    
    .section-header-with-reset {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* 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;
    }
}