/* ============================================
   Image Upscaler - Modern Styling with Dark Mode
   ============================================ */

/* CSS Variables - Light Mode (Default) */
:root {
    --transition-speed: 0.25s;
    
    /* Primary Colors - Blue Theme */
    --primary: #3399cc;
    --primary-light: #e0f2fe;
    --primary-dark: #2980b9;
    --accent: #60a5fa;
    
    /* Status Colors */
    --success: #339966;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #e64e4e;
    --danger-light: #fee2e2;
    
    /* Preset Colors */
    --photo-color: #3399cc;
    --artwork-color: #8b5cf6;
    --pixel-color: #f59e0b;
    --text-color: #339966;
    
    /* Algorithm Colors */
    --lanczos-color: #8b5cf6;
    --bicubic-color: #3399cc;
    --bilinear-color: #339966;
    --nearest-color: #f59e0b;
    
    /* 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(0,0,0,0.08);
    --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(51, 153, 204, 0.3);
    --shadow-primary-hover: 0 6px 20px rgba(51, 153, 204, 0.4);
    
    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Checkerboard for transparency */
    --checker-color: #e5e7eb;
    
    /* Error colors */
    --error-bg: #fef2f2;
    --error-border: #fecaca;
    
    /* Input */
    --input-bg: #ffffff;
    --input-border: #e2e8f0;
    
    /* Scrollbar */
    --scrollbar-track: var(--bg);
    --scrollbar-thumb: var(--text-muted);
    --scrollbar-thumb-hover: var(--text-secondary);
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --primary: #60a5fa;
    --primary-light: rgba(96, 165, 250, 0.15);
    --primary-dark: #3b82f6;
    --accent: #93c5fd;
    
    /* Status Colors */
    --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 */
    --photo-color: #60a5fa;
    --artwork-color: #a78bfa;
    --pixel-color: #fbbf24;
    --text-color: #4ade80;
    
    /* Algorithm Colors */
    --lanczos-color: #a78bfa;
    --bicubic-color: #60a5fa;
    --bilinear-color: #4ade80;
    --nearest-color: #fbbf24;
    
    /* 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(96, 165, 250, 0.2);
    --shadow-primary-hover: 0 6px 20px rgba(96, 165, 250, 0.3);
    
    /* Checkerboard for transparency */
    --checker-color: #374151;
    
    /* Error colors */
    --error-bg: rgba(239, 68, 68, 0.15);
    --error-border: rgba(248, 113, 113, 0.3);
    
    /* Input */
    --input-bg: #334155;
    --input-border: #475569;
    
    /* 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-primary);
    flex-shrink: 0;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.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;
    color: var(--primary);
    letter-spacing: -0.02em;
}

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

.tool-description a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.tool-description a:hover {
    text-decoration: underline;
}

/* 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);
    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: var(--primary-light);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.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: 0.5;
}

.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 1rem;
    font-size: 1rem;
}

.file-types {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.file-type-badge {
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.upload-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

/* Editor Section */
.editor-section {
    padding: 0;
}

/* Files Header */
.files-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.875rem 1.5rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.files-header-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text);
    font-size: 0.95rem;
}

.files-header-left svg,
.files-header-left i {
    color: var(--primary);
    width: 18px;
    height: 18px;
}

.btn-text {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: none;
    border: none;
    color: var(--primary);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.btn-text:hover {
    background: var(--primary-light);
}

/* Preview Section */
.preview-section {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.preview-container {
    text-align: center;
}

.preview-image-wrapper {
    max-width: 350px;
    max-height: 250px;
    margin: 0 auto 1rem;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: repeating-conic-gradient(var(--checker-color) 0% 25%, transparent 0% 50%) 
                50% / 16px 16px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.preview-image-wrapper img {
    max-width: 100%;
    max-height: 250px;
    display: block;
}

.image-info {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.info-item svg,
.info-item i {
    color: var(--primary);
    width: 14px;
    height: 14px;
}

/* Settings Panel */
.settings-panel {
    padding: 1.5rem;
    background: var(--bg-elevated);
    transition: background-color var(--transition-speed);
}

.panel-header {
    margin-bottom: 1.25rem;
}

.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);
    width: 18px;
    height: 18px;
}

/* Settings Grid - Two Columns */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.settings-column {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* Section Label */
.section-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
}

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

.auto-badge {
    font-size: 0.65rem;
    padding: 0.15rem 0.4rem;
    background: var(--success-light);
    color: var(--success);
    border-radius: var(--radius-full);
    font-weight: 600;
    text-transform: uppercase;
    margin-left: auto;
}

/* ============================================
   PRESET CHIPS - Compact Image Type Selection
   ============================================ */
.preset-section {
    margin-bottom: 0;
}

.preset-chips {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.preset-chip {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.7rem;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.preset-chip input {
    display: none;
}

.preset-chip svg,
.preset-chip i {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}

.preset-chip:hover {
    border-color: var(--primary);
    background: var(--bg);
}

.preset-chip.active,
.preset-chip:has(input:checked) {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
}

.preset-chip.active svg,
.preset-chip:has(input:checked) svg,
.preset-chip.active i,
.preset-chip:has(input:checked) i {
    opacity: 1;
    color: var(--primary);
}

/* Preset-specific colors when active */
.preset-chip[data-preset="photo"].active,
.preset-chip[data-preset="photo"]:has(input:checked) {
    border-color: var(--photo-color);
    background: rgba(51, 153, 204, 0.1);
    color: var(--photo-color);
}
[data-theme="dark"] .preset-chip[data-preset="photo"].active,
[data-theme="dark"] .preset-chip[data-preset="photo"]:has(input:checked) {
    background: rgba(96, 165, 250, 0.15);
}

.preset-chip[data-preset="artwork"].active,
.preset-chip[data-preset="artwork"]:has(input:checked) {
    border-color: var(--artwork-color);
    background: rgba(139, 92, 246, 0.1);
    color: var(--artwork-color);
}
[data-theme="dark"] .preset-chip[data-preset="artwork"].active,
[data-theme="dark"] .preset-chip[data-preset="artwork"]:has(input:checked) {
    background: rgba(167, 139, 250, 0.15);
}

.preset-chip[data-preset="pixel"].active,
.preset-chip[data-preset="pixel"]:has(input:checked) {
    border-color: var(--pixel-color);
    background: rgba(245, 158, 11, 0.1);
    color: var(--pixel-color);
}
[data-theme="dark"] .preset-chip[data-preset="pixel"].active,
[data-theme="dark"] .preset-chip[data-preset="pixel"]:has(input:checked) {
    background: rgba(251, 191, 36, 0.15);
}

.preset-chip[data-preset="text"].active,
.preset-chip[data-preset="text"]:has(input:checked) {
    border-color: var(--text-color);
    background: rgba(51, 153, 102, 0.1);
    color: var(--text-color);
}
[data-theme="dark"] .preset-chip[data-preset="text"].active,
[data-theme="dark"] .preset-chip[data-preset="text"]:has(input:checked) {
    background: rgba(74, 222, 128, 0.15);
}

/* ============================================
   SCALE CHIPS - Compact Scale Selection
   ============================================ */
.scale-section {
    margin-bottom: 0;
}

.scale-row {
    margin-bottom: 0.6rem;
}

.scale-chips {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.scale-chip {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.45rem 0.8rem;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 50px;
}

.scale-chip input {
    display: none;
}

.scale-chip:hover {
    border-color: var(--primary);
    background: var(--bg);
}

.scale-chip.active,
.scale-chip:has(input:checked) {
    border-color: var(--primary);
    background: var(--primary);
    color: white;
}

/* Custom Dimensions */
.custom-dimensions {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    margin-bottom: 0.6rem;
    border: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.dimension-inputs {
    display: flex;
    align-items: flex-end;
    gap: 0.5rem;
}

.dimension-field {
    flex: 1;
}

.dimension-field label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-with-unit {
    display: flex;
    align-items: center;
    background: var(--input-bg);
    border: 1.5px solid var(--input-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color 0.2s ease;
}

.input-with-unit:focus-within {
    border-color: var(--primary);
}

.input-with-unit input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 0.5rem;
    font-size: 0.9rem;
    color: var(--text);
    width: 100%;
    outline: none;
}

.input-with-unit .unit {
    padding: 0.5rem;
    background: var(--bg-tertiary);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

.link-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--primary);
    transition: all 0.2s ease;
    flex-shrink: 0;
}

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

.link-btn.linked {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* Output Dimensions */
.output-dimensions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.75rem;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    color: var(--primary);
    font-size: 0.85rem;
    transition: background-color var(--transition-speed);
}

.output-dimensions svg,
.output-dimensions i {
    color: var(--primary);
    width: 14px;
    height: 14px;
}

/* ============================================
   ALGORITHM CHIPS - Compact Grid
   ============================================ */
.algorithm-section {
    margin-bottom: 0;
}

.algorithm-chips {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
}

.algo-chip {
    display: flex;
    align-items: center;
    padding: 0.5rem 0.65rem;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.algo-chip input {
    display: none;
}

.algo-chip:hover {
    border-color: var(--primary);
    background: var(--bg);
}

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

.algo-chip-content {
    display: flex;
    flex-direction: column;
}

.algo-chip-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.2;
}

.algo-chip-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
    line-height: 1.2;
}

.algo-chip:has(input:checked) .algo-chip-name {
    color: var(--primary);
}

/* Algorithm-specific colors */
.algo-chip[data-algo="lanczos"]:has(input:checked) {
    border-color: var(--lanczos-color);
    background: rgba(139, 92, 246, 0.1);
}
.algo-chip[data-algo="lanczos"]:has(input:checked) .algo-chip-name {
    color: var(--lanczos-color);
}
[data-theme="dark"] .algo-chip[data-algo="lanczos"]:has(input:checked) {
    background: rgba(167, 139, 250, 0.15);
}

.algo-chip[data-algo="bicubic"]:has(input:checked) {
    border-color: var(--bicubic-color);
    background: rgba(51, 153, 204, 0.1);
}
.algo-chip[data-algo="bicubic"]:has(input:checked) .algo-chip-name {
    color: var(--bicubic-color);
}
[data-theme="dark"] .algo-chip[data-algo="bicubic"]:has(input:checked) {
    background: rgba(96, 165, 250, 0.15);
}

.algo-chip[data-algo="bilinear"]:has(input:checked) {
    border-color: var(--bilinear-color);
    background: rgba(51, 153, 102, 0.1);
}
.algo-chip[data-algo="bilinear"]:has(input:checked) .algo-chip-name {
    color: var(--bilinear-color);
}
[data-theme="dark"] .algo-chip[data-algo="bilinear"]:has(input:checked) {
    background: rgba(74, 222, 128, 0.15);
}

.algo-chip[data-algo="nearest"]:has(input:checked) {
    border-color: var(--nearest-color);
    background: rgba(245, 158, 11, 0.1);
}
.algo-chip[data-algo="nearest"]:has(input:checked) .algo-chip-name {
    color: var(--nearest-color);
}
[data-theme="dark"] .algo-chip[data-algo="nearest"]:has(input:checked) {
    background: rgba(251, 191, 36, 0.15);
}

/* ============================================
   FORMAT SECTION
   ============================================ */
.format-section {
    margin-bottom: 0;
}

.format-select {
    width: 100%;
    padding: 0.6rem 0.9rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    background: var(--input-bg);
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 0.5rem;
}

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

.quality-control {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 0;
}

.quality-control label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.quality-control input[type="range"] {
    flex: 1;
    height: 5px;
    border-radius: var(--radius-full);
    background: linear-gradient(to right, var(--warning), var(--success));
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.quality-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 2px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.quality-control input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 2px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

#qualityValue {
    color: var(--text);
    font-weight: 600;
    font-size: 0.85rem;
    min-width: 36px;
}

/* ============================================
   ENHANCEMENT OPTIONS - Noise Reduction & Sharpen
   ============================================ */
.enhancement-section {
    margin-bottom: 0;
}

.enhancement-options {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.toggle-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.toggle-option:hover {
    background: var(--bg-tertiary);
}

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

.toggle-option input {
    display: none;
}

.toggle-switch {
    position: relative;
    width: 36px;
    height: 20px;
    background: var(--border);
    border-radius: var(--radius-full);
    transition: background-color 0.2s ease;
    flex-shrink: 0;
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.toggle-option input:checked + .toggle-switch {
    background: var(--success);
}

.toggle-option input:checked + .toggle-switch::after {
    transform: translateX(16px);
}

.toggle-label {
    flex: 1;
    min-width: 0;
}

.toggle-title {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.2;
}

.toggle-desc {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.2;
}

/* Denoise Strength */
.denoise-strength {
    padding: 0.5rem 0.75rem;
    margin-left: 2.85rem;
    background: var(--bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.denoise-strength label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
    text-transform: uppercase;
}

.strength-chips {
    display: flex;
    gap: 0.3rem;
}

.strength-chip {
    flex: 1;
    text-align: center;
    padding: 0.35rem 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.strength-chip input {
    display: none;
}

.strength-chip:hover {
    border-color: var(--success);
}

.strength-chip.active,
.strength-chip:has(input:checked) {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

/* Quality Info Box */
.quality-info {
    display: flex;
    gap: 0.6rem;
    padding: 0.75rem;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-speed);
}

.quality-info .info-icon {
    color: var(--primary);
    flex-shrink: 0;
}

.quality-info .info-icon svg,
.quality-info .info-icon i {
    width: 16px;
    height: 16px;
}

.quality-info .info-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.quality-info .info-text strong {
    color: var(--text);
}

/* ============================================
   ACTION BAR
   ============================================ */
.action-bar {
    display: flex;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    justify-content: flex-end;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.7rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-decoration: none;
}

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

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

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

.btn-large {
    padding: 0.85rem 1.5rem;
    font-size: 1rem;
}

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

/* ============================================
   PROCESSING OVERLAY
   ============================================ */
.processing-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.processing-content {
    background: var(--bg-elevated);
    padding: 2rem;
    border-radius: var(--radius-xl);
    text-align: center;
    max-width: 320px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    transition: background-color var(--transition-speed);
}

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

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

.processing-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 1rem;
}

.processing-progress {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.progress-track {
    flex: 1;
    height: 6px;
    background: var(--border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

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

.progress-text {
    min-width: 36px;
    font-weight: 600;
    color: var(--primary);
    font-size: 0.85rem;
}

.processing-status {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0;
}

/* ============================================
   RESULTS SECTION
   ============================================ */
.results-section {
    padding: 2rem;
}

.results-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.results-header .success-icon {
    width: 56px;
    height: 56px;
    background: var(--success-light);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem;
    color: var(--success);
    transition: background-color var(--transition-speed);
}

.results-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}

/* Comparison */
.comparison-container {
    margin-bottom: 1.5rem;
}

.comparison-header {
    display: flex;
    justify-content: center;
    gap: 0.4rem;
    margin-bottom: 1rem;
}

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

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

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

.comparison-view {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    border: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.comparison-view.side-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.compare-item {
    text-align: center;
}

.compare-label {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background: var(--text-muted);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.6rem;
}

.compare-item.upscaled .compare-label {
    background: var(--success);
}

.compare-image-wrapper {
    background: repeating-conic-gradient(var(--checker-color) 0% 25%, transparent 0% 50%) 
                50% / 14px 14px;
    border-radius: var(--radius-md);
    padding: 0.4rem;
    margin-bottom: 0.4rem;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: background-color var(--transition-speed);
}

.compare-image-wrapper img {
    max-width: 100%;
    max-height: 160px;
    border-radius: var(--radius-sm);
}

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

/* Results Stats */
.results-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.stat-box {
    text-align: center;
    padding: 0.6rem 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.stat-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.2rem;
}

.stat-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
}

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

.stat-arrow svg,
.stat-arrow i {
    width: 20px;
    height: 20px;
}

.scale-stat {
    background: var(--primary-light);
    border-color: var(--primary);
}

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

/* Download Actions */
.download-actions {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Error Display */
.error-display {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--danger);
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius-md);
    margin: 1rem 1.5rem;
    font-weight: 500;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

/* ============================================
   RELATED TOOLS
   ============================================ */
.related-tools {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 2rem;
    padding: 1rem 1.25rem;
    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: 0.4rem;
    font-weight: 600;
    color: var(--text);
    font-size: 0.85rem;
}

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

.related-links {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.8rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    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(-1px);
}

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

/* ============================================
   INFO SECTIONS
   ============================================ */
.info-sections {
    display: grid;
    gap: 1.5rem;
    margin-top: 2rem;
}

.info-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    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: 0.6rem;
    font-size: 1.2rem;
    color: var(--text);
    margin: 0 0 1.25rem;
}

.info-card h2 svg,
.info-card h2 i {
    color: var(--primary);
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

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

.steps-list li {
    position: relative;
    padding-left: 3rem;
    padding-bottom: 1rem;
    counter-increment: step;
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

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

.steps-list li:not(:last-child)::after {
    content: '';
    position: absolute;
    left: calc(0.875rem - 1px);
    top: 1.75rem;
    bottom: 0;
    width: 2px;
    background: var(--primary-light);
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    z-index: 1;
}

.steps-list li a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.steps-list li a:hover {
    text-decoration: underline;
}

/* Algorithm Explanations */
.algorithm-explanations {
    display: grid;
    gap: 0.875rem;
}

.algo-explain {
    display: flex;
    gap: 0.875rem;
    align-items: flex-start;
}

.algo-tag {
    flex-shrink: 0;
    padding: 0.3rem 0.7rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
}

.algo-tag.photo { background: var(--photo-color); }
.algo-tag.artwork { background: var(--artwork-color); }
.algo-tag.pixel { background: var(--pixel-color); }
.algo-tag.text { background: var(--text-color); }
.algo-tag.lanczos { background: var(--lanczos-color); }
.algo-tag.bicubic { background: var(--bicubic-color); }
.algo-tag.bilinear { background: var(--bilinear-color); }
.algo-tag.nearest { background: var(--nearest-color); }

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

.algo-explain p a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.algo-explain p a:hover {
    text-decoration: underline;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
}

.benefit-item {
    display: flex;
    gap: 0.875rem;
    align-items: flex-start;
}

.benefit-icon {
    width: 36px;
    height: 36px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
    transition: background-color var(--transition-speed);
}

.benefit-icon svg,
.benefit-icon i {
    width: 18px;
    height: 18px;
}

.benefit-content h4 {
    margin: 0 0 0.2rem;
    font-size: 0.95rem;
    color: var(--text);
}

.benefit-content p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.benefit-content p a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.benefit-content p a:hover {
    text-decoration: underline;
}

/* FAQ */
.faq-list {
    display: grid;
    gap: 0.6rem;
}

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

.faq-item:hover {
    border-color: var(--primary);
}

.faq-question {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-secondary);
    border: none;
    text-align: left;
    font-size: 0.95rem;
    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-tertiary);
}

.faq-question svg,
.faq-question i {
    color: var(--primary);
    transition: transform 0.3s ease;
    flex-shrink: 0;
    width: 18px;
    height: 18px;
}

.faq-item.open .faq-question {
    background: var(--bg-tertiary);
}

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

.faq-answer {
    display: none;
    padding: 0.875rem 1rem;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    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;
    font-size: 0.9rem;
}

.faq-answer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

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

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
    .settings-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
}

@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: 1.5rem;
    }
    
    .upload-area {
        padding: 2rem 1.25rem;
    }
    
    .preview-section,
    .settings-panel {
        padding: 1.25rem;
    }
    
    .action-bar {
        flex-direction: column;
        padding: 1.25rem;
    }
    
    .btn {
        width: 100%;
    }
    
    .files-header {
        padding: 0.75rem 1.25rem;
    }
    
    .results-stats {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .stat-arrow {
        transform: rotate(90deg);
    }
    
    .comparison-view.side-view {
        grid-template-columns: 1fr;
    }
    
    .related-tools {
        flex-direction: column;
        text-align: center;
    }
    
    .related-links {
        justify-content: center;
    }
    
    .algo-explain {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .preset-chips {
        flex-wrap: wrap;
    }
    
    .scale-chips {
        flex-wrap: wrap;
    }
    
    .algorithm-chips {
        grid-template-columns: 1fr;
    }
    
    .dimension-inputs {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .link-btn {
        align-self: center;
        transform: rotate(90deg);
    }
    
    .download-actions {
        flex-direction: column;
    }
    
    .download-actions .btn {
        width: 100%;
    }
    
    .info-card {
        padding: 1.25rem;
    }
}

@media (max-width: 480px) {
    .tool-title {
        font-size: 1.5rem;
    }
    
    .files-header {
        flex-direction: column;
        gap: 0.6rem;
        align-items: flex-start;
    }
    
    .image-info {
        flex-direction: column;
        gap: 0.4rem;
    }
    
    .comparison-header {
        flex-direction: column;
    }
    
    .view-btn {
        width: 100%;
        justify-content: center;
    }
    
    .preset-chip {
        flex: 1;
        min-width: calc(50% - 0.2rem);
        justify-content: center;
    }
    
    .scale-chip {
        flex: 1;
        min-width: calc(33% - 0.25rem);
    }
    
    .steps-list li {
        padding-left: 2.5rem;
        font-size: 0.9rem;
    }
    
    .steps-list li::before {
        width: 1.5rem;
        height: 1.5rem;
        font-size: 0.75rem;
    }
    
    .steps-list li:not(:last-child)::after {
        left: calc(0.75rem - 1px);
    }
}

/* 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(51, 153, 204, 0.2);
    color: var(--text);
}

[data-theme="dark"] ::selection {
    background: rgba(96, 165, 250, 0.3);
}

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

.editor-section,
.results-section {
    animation: fadeIn 0.4s ease;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}