/* SIMGTOPDF Pro v2.0 - Modern CSS Styling */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Enhanced */
    --primary-color: #4f46e5;
    --primary-dark: #3730a3;
    --primary-light: #6366f1;
    --primary-gradient: linear-gradient(135deg, #4f46e5, #7c3aed, #ec4899);
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --warning-color: #f97316;
    --success-color: #22c55e;
    --info-color: #3b82f6;
    
    /* Neutral Colors - Enhanced */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0f172a;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* Dark Mode Colors */
    --dark-bg-primary: #0f172a;
    --dark-bg-secondary: #1e293b;
    --dark-bg-tertiary: #334155;
    --dark-text-primary: #f8fafc;
    --dark-text-secondary: #cbd5e1;
    --dark-border: #334155;
    
    /* Enhanced Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Enhanced Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 5rem;
    
    /* Enhanced Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;
    
    /* Enhanced Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
    --shadow-glow: 0 0 20px rgb(79 70 229 / 0.3);
    --shadow-colored: 0 10px 25px -5px rgb(79 70 229 / 0.4);
    
    /* Enhanced Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Animation Properties */
    --animation-duration: 1s;
    --animation-timing: ease-in-out;
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
    --z-toast: 1070;
}

/* Enhanced Base Styles */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background: var(--primary-gradient);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Enhanced Background Animation */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    background-size: 400% 400%;
    animation: gradientShift 20s ease infinite;
    z-index: -2;
}

.background-animation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.4) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(139, 92, 246, 0.3) 0%, transparent 50%);
    animation: floatingElements 25s ease-in-out infinite;
}

.background-animation::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.05) 50%, transparent 60%);
    animation: lightBeam 15s linear infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    25% { background-position: 100% 50%; }
    50% { background-position: 100% 100%; }
    75% { background-position: 0% 100%; }
}

@keyframes floatingElements {
    0%, 100% { transform: translateY(0px) rotate(0deg) scale(1); }
    33% { transform: translateY(-30px) rotate(120deg) scale(1.1); }
    66% { transform: translateY(-15px) rotate(240deg) scale(0.9); }
}

@keyframes lightBeam {
    0% { transform: translateX(-100%) skewX(-15deg); }
    100% { transform: translateX(100%) skewX(-15deg); }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

/* Enhanced Header Styles */
.header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    padding: var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(30px) saturate(180%);
    border-radius: var(--radius-3xl);
    box-shadow: var(--shadow-2xl), var(--shadow-glow);
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
    transform: translateY(0);
    animation: headerFloat 8s ease-in-out infinite;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 4s infinite;
}

.header::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg at 50% 50%, transparent 0deg, rgba(79, 70, 229, 0.1) 90deg, transparent 180deg);
    animation: conicRotate 20s linear infinite;
    z-index: -1;
}

@keyframes headerFloat {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-5px) scale(1.01); }
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

@keyframes conicRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.logo-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.logo-icon {
    position: relative;
    width: 90px;
    height: 90px;
    background: var(--primary-gradient);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-4xl);
    color: white;
    box-shadow: var(--shadow-xl), var(--shadow-colored);
    overflow: hidden;
    animation: logoFloat 8s ease-in-out infinite;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.logo-icon::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: logoRotate 6s linear infinite;
}

.logo-icon::after {
    content: '';
    position: absolute;
    top: 15%;
    left: 15%;
    width: 25%;
    height: 25%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.8) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(2px);
}

.logo-shine {
    position: absolute;
    top: 10%;
    left: 10%;
    width: 30%;
    height: 30%;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
    filter: blur(8px);
    animation: shineFloat 4s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0px) scale(1) rotate(0deg); }
    50% { transform: translateY(-12px) scale(1.05) rotate(2deg); }
}

@keyframes logoRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes shineFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(5px, -5px) scale(1.2); }
}

.logo-text h1 {
    font-size: var(--font-size-5xl);
    font-weight: 900;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.05em;
    position: relative;
    animation: textGlow 3s ease-in-out infinite alternate;
}

.logo-text h1::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: blur(2px);
    opacity: 0.5;
    z-index: -1;
}

@keyframes textGlow {
    0%, 100% { filter: brightness(1) contrast(1); }
    50% { filter: brightness(1.2) contrast(1.1); }
}

.version {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-color), var(--warning-color));
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.header p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* Feature Badges */
.feature-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    cursor: default;
}

.badge:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.badge-security {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.badge-speed {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.badge-mobile {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
    color: white;
}

.badge-quality {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

/* Back Button */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: all var(--transition-fast);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Card Styles */
.upload-card,
.settings-panel,
.preview-section,
.progress-section,
.result-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
    position: relative;
}

/* Upload Section */
.upload-section {
    margin-bottom: var(--spacing-xl);
}

.upload-area {
    padding: var(--spacing-3xl);
    text-align: center;
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-xl);
    margin: var(--spacing-xl);
    transition: all var(--transition-normal);
    position: relative;
    background: rgba(248, 250, 252, 0.5);
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.05);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    animation: uploadFloat 3s ease-in-out infinite;
}

@keyframes uploadFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.upload-area h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.upload-limit {
    font-size: var(--font-size-sm);
    color: var(--text-light);
}

/* Enhanced Button Styles */
.upload-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg), var(--shadow-colored);
    margin-top: var(--spacing-lg);
    position: relative;
    overflow: hidden;
    transform: translateY(0);
}

.upload-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left var(--transition-normal);
}

.upload-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

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

.upload-btn:active {
    transform: translateY(-1px) scale(1.01);
    transition: all var(--transition-fast);
}

.upload-btn:focus-visible {
    outline: 3px solid rgba(79, 70, 229, 0.4);
    outline-offset: 2px;
}

/* Settings Panel */
.settings-panel {
    padding: var(--spacing-xl);
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
}

.settings-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toggle-settings {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.toggle-settings:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.setting-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.setting-group select,
.setting-group input[type="number"],
.setting-group input[type="color"] {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    background: white;
}

.setting-group select:focus,
.setting-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Quality Slider */
.quality-slider {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.quality-slider input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

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

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

#qualityValue {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 40px;
}

/* Checkbox Styles */
.checkbox-group {
    flex-direction: row !important;
    align-items: center;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

.checkbox-group input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all var(--transition-fast);
    background: white;
}

.checkbox-group input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-group input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: bold;
}

/* Advanced Settings */
.advanced-settings {
    border-top: 1px solid var(--border-light);
    padding-top: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.custom-size-settings {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-lg);
}

/* Preview Section */
.preview-section {
    padding: var(--spacing-xl);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.preview-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.preview-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.action-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
    transform: translateY(-1px);
}

/* Sort Options */
.sort-options {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
}

.sort-options label {
    font-weight: 500;
    color: var(--text-primary);
}

.sort-options select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: white;
}

.sort-direction {
    padding: var(--spacing-sm);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sort-direction:hover {
    background: var(--bg-secondary);
}

/* Image Grid */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    min-height: 200px;
}

.image-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: white;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 2px solid transparent;
}

.image-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.image-item.selected {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.image-preview {
    width: 100%;
    height: 150px;
    object-fit: cover;
    display: block;
}

.image-info {
    padding: var(--spacing-md);
}

.image-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.image-size {
    color: var(--text-light);
    font-size: var(--font-size-xs);
}

.image-checkbox {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 24px;
    height: 24px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.image-remove {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    width: 24px;
    height: 24px;
    background: rgba(239, 68, 68, 0.9);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all var(--transition-fast);
    font-size: var(--font-size-xs);
}

.image-item:hover .image-remove {
    opacity: 1;
}

/* Conversion Actions */
.conversion-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.conversion-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.conversion-info span {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.convert-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: linear-gradient(135deg, var(--success-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.convert-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.convert-btn:disabled {
    background: var(--border-color);
    color: var(--text-light);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Progress Section */
.progress-card {
    padding: var(--spacing-xl);
    text-align: center;
}

.progress-header {
    margin-bottom: var(--spacing-xl);
}

.progress-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-lg);
    transition: width var(--transition-normal);
    width: 0%;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 33%, rgba(255, 255, 255, 0.3) 50%, transparent 66%);
    animation: progressShine 2s infinite;
}

@keyframes progressShine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Result Section */
.result-card {
    padding: var(--spacing-xl);
    text-align: center;
}

.result-card.success .result-icon {
    color: var(--success-color);
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    animation: successPulse 2s ease-in-out;
}

@keyframes successPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.result-card h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

.result-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    text-align: center;
}

.info-item .label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.info-item span:last-child {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: linear-gradient(135deg, var(--success-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.reset-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.reset-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
    transform: translateY(-1px);
}

/* Enhanced Loading States */
.upload-area.loading {
    position: relative;
    pointer-events: none;
}

.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    z-index: 10;
}

.loading-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    overflow: hidden;
}

.loading-progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    width: 0%;
    transition: width var(--transition-normal);
    border-radius: inherit;
}

/* Enhanced Drop Helper */
.drop-helper {
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--z-tooltip);
    pointer-events: none;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(79, 70, 229, 0.9);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(10px);
    animation: dropHelperFloat 2s ease-in-out infinite;
}

.drop-helper-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
}

@keyframes dropHelperFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
}

/* Enhanced Image Grid */
.image-item {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: white;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
    transform: translateY(0);
}

.image-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 1;
    pointer-events: none;
}

.image-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.image-item:hover::before {
    opacity: 1;
}

.image-item.selected {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg), 0 0 0 4px rgba(79, 70, 229, 0.2);
    transform: translateY(-4px);
}

.image-item.selected::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    z-index: -1;
    opacity: 0.1;
}

/* Enhanced Image Preview */
.image-preview {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
    transition: all var(--transition-normal);
    position: relative;
}

.image-item:hover .image-preview {
    filter: brightness(1.1) contrast(1.05);
}

/* Enhanced Image Info */
.image-info {
    padding: var(--spacing-md);
    background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.02));
}

.image-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
}

.image-name::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width var(--transition-normal);
}

.image-item:hover .image-name::after {
    width: 100%;
}

.image-size {
    color: var(--text-light);
    font-size: var(--font-size-xs);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Enhanced Interactive Elements */
.image-checkbox {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 28px;
    height: 28px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    z-index: 2;
    border: 2px solid transparent;
}

.image-checkbox:hover {
    background: white;
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.image-item.selected .image-checkbox {
    background: var(--primary-color);
    color: white;
    border-color: white;
    transform: scale(1.1);
}

.image-remove {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    width: 28px;
    height: 28px;
    background: rgba(239, 68, 68, 0.95);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all var(--transition-fast);
    font-size: var(--font-size-xs);
    z-index: 2;
    transform: scale(0.8);
}

.image-item:hover .image-remove {
    opacity: 1;
    transform: scale(1);
}

.image-remove:hover {
    background: var(--danger-color);
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

/* Enhanced Conversion Actions */
.conversion-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.8), rgba(241, 245, 249, 0.9));
    backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-lg);
}

.conversion-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.conversion-info span {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.conversion-info span:first-child {
    color: var(--text-primary);
    font-weight: 600;
    font-size: var(--font-size-base);
}

/* Enhanced Convert Button */
.convert-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-2xl);
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-lg);
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg), var(--shadow-colored);
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.convert-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left var(--transition-slow);
}

.convert-btn:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-2xl), var(--shadow-glow);
}

.convert-btn:hover:not(:disabled)::before {
    left: 100%;
}

.convert-btn:active:not(:disabled) {
    transform: translateY(-1px) scale(1.02);
    transition: all var(--transition-fast);
}

.convert-btn:disabled {
    background: linear-gradient(135deg, var(--border-color), var(--text-light));
    color: var(--text-light);
    cursor: not-allowed;
    transform: none;
    box-shadow: var(--shadow-sm);
}

.convert-btn:disabled::before {
    display: none;
}

/* Enhanced Progress Indicators */
.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 33%, rgba(255, 255, 255, 0.4) 50%, transparent 66%);
    animation: progressShine 2s infinite;
    border-radius: inherit;
}

@keyframes progressShine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Enhanced Result Section */
.result-card.success .result-icon {
    color: var(--success-color);
    font-size: 5rem;
    margin-bottom: var(--spacing-xl);
    animation: successPulse 2s ease-in-out, successGlow 3s ease-in-out infinite;
    position: relative;
}

.result-card.success .result-icon::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, var(--success-color) 0%, transparent 60%);
    opacity: 0.2;
    border-radius: 50%;
    animation: successPulse 2s ease-in-out infinite;
}

@keyframes successPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes successGlow {
    0%, 100% { filter: brightness(1) drop-shadow(0 0 10px var(--success-color)); }
    50% { filter: brightness(1.2) drop-shadow(0 0 20px var(--success-color)); }
}

/* Enhanced Download Button */
.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-2xl);
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-lg);
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg), var(--shadow-colored);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left var(--transition-slow);
}

.download-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-2xl), var(--shadow-glow);
    text-decoration: none;
    color: white;
}

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

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: var(--dark-bg-primary);
        --bg-secondary: var(--dark-bg-secondary);
        --bg-tertiary: var(--dark-bg-tertiary);
        --text-primary: var(--dark-text-primary);
        --text-secondary: var(--dark-text-secondary);
        --border-color: var(--dark-border);
    }
    
    .header {
        background: rgba(15, 23, 42, 0.95);
    }
    
    .upload-card,
    .settings-panel,
    .preview-section,
    .progress-section,
    .result-section {
        background: rgba(15, 23, 42, 0.95);
    }
    
    .image-item {
        background: var(--dark-bg-secondary);
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --shadow-sm: 0 2px 4px 0 rgb(0 0 0 / 0.3);
        --shadow-md: 0 4px 8px 0 rgb(0 0 0 / 0.3);
        --shadow-lg: 0 8px 16px 0 rgb(0 0 0 / 0.3);
    }
    
    .image-item:hover {
        border-width: 3px;
    }
    
    .convert-btn,
    .download-btn {
        border: 2px solid rgba(255, 255, 255, 0.8);
    }
}

/* Enhanced Mobile Optimization */
@media (max-width: 768px) {
    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: var(--spacing-sm);
    }
    
    .image-preview {
        height: 120px;
    }
    
    .conversion-actions {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .convert-btn,
    .download-btn {
        width: 100%;
        justify-content: center;
    }
    
    .drop-helper {
        display: none !important;
    }
}

@media (max-width: 480px) {
    .image-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .image-preview {
        height: 100px;
    }
    
    .image-info {
        padding: var(--spacing-sm);
    }
    
    .image-name,
    .image-size {
        font-size: var(--font-size-xs);
    }
}

/* Performance Optimizations */
.image-item,
.upload-btn,
.convert-btn,
.download-btn {
    will-change: transform;
}

/* Accessibility Enhancements */
@media (prefers-reduced-motion: reduce) {
    .image-item:hover {
        transform: none;
    }
    
    .convert-btn:hover,
    .download-btn:hover {
        transform: none;
    }
    
    .loading-spinner i {
        animation: none;
    }

    .container {
        padding: var(--spacing-md);
    }
    
    .header {
        padding: var(--spacing-lg);
    }
    
    .logo-section {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .logo-icon {
        width: 60px;
        height: 60px;
        font-size: var(--font-size-2xl);
    }
    
    .logo-text h1 {
        font-size: var(--font-size-3xl);
    }
    
    .feature-badges {
        gap: var(--spacing-sm);
    }
    
    .badge {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    .settings-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }
    
    .preview-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .preview-actions {
        justify-content: center;
    }
    
    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-md);
    }
    
    .conversion-actions {
        flex-direction: column;
        text-align: center;
    }
    
    .progress-details {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
    
    .result-info {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .sort-options {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-sm);
    }

}
@media (max-width: 480px) {
    .upload-area {
        padding: var(--spacing-xl);
        margin: var(--spacing-md);
    }
    
    .upload-icon {
        font-size: 3rem;
    }
    
    .upload-area h3 {
        font-size: var(--font-size-xl);
    }
    
    .upload-btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
    
    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .image-preview {
        height: 120px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
button:focus-visible,
select:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .background-animation {
        display: none;
    }
    
    body {
        background: white;
    }
    
    .container {
        box-shadow: none;
    }
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* Tooltip styles */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
    z-index: 1000;
}

[data-tooltip]:hover::after {
    opacity: 1;
}

/* Error states */
.error {
    color: var(--danger-color);
    border-color: var(--danger-color) !important;
}

.error-message {
    color: var(--danger-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Success states */
.success {
    color: var(--success-color);
    border-color: var(--success-color) !important;
}

.success-message {
    color: var(--success-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Preview Modal Styles */
.preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.preview-modal-content {
    background: var(--bg-color);
    border-radius: 20px;
    padding: 2rem;
    max-width: 90vw;
    max-height: 90vh;
    width: 800px;
    height: 600px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.preview-header h3 {
    margin: 0;
    color: var(--text-color);
    font-size: 1.5rem;
}

.close-preview {
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.close-preview:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(220, 53, 69, 0.3);
}

.preview-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.preview-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
}

.preview-loading i {
    font-size: 3rem;
    color: var(--primary-color);
}

/* Performance Info Styles */
.performance-info {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    backdrop-filter: blur(10px);
    display: inline-block;
    min-width: 200px;
    text-align: center;
}

/* Enhanced Button Animations */
@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(52, 152, 219, 0.7);
    }
    70% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(52, 152, 219, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(52, 152, 219, 0);
    }
}

.btn-primary.pulse {
    animation: pulse 2s infinite;
}

/* Success State Animations */
@keyframes checkmark {
    0% {
        transform: scale(0) rotate(45deg);
        opacity: 0;
    }
    50% {
        transform: scale(1.2) rotate(45deg);
        opacity: 1;
    }
    100% {
        transform: scale(1) rotate(45deg);
        opacity: 1;
    }
}

.success-checkmark {
    display: inline-block;
    width: 20px;
    height: 20px;
    position: relative;
    margin-left: 0.5rem;
}

.success-checkmark::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 12px;
    border: solid var(--success-color);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    left: 6px;
    top: 2px;
    animation: checkmark 0.5s ease-in-out;
}

/* Enhanced Loading States */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: inherit;
    z-index: 10;
}

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

.loading-text {
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 500;
}

/* Advanced Grid Layout for Images */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    padding: 1rem;
}

.image-item {
    position: relative;
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    cursor: pointer;
}

.image-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.image-item.selected {
    border-color: var(--success-color);
    box-shadow: 0 0 0 4px rgba(40, 167, 69, 0.2);
}

.image-preview {
    width: 100%;
    height: 150px;
    object-fit: cover;
    display: block;
}

.image-info {
    padding: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.image-name {
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.image-size {
    display: flex;
    justify-content: space-between;
}

/* Settings Import/Export */
.settings-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.settings-actions .btn {
    flex: 1;
    font-size: 0.8rem;
    padding: 0.5rem;
}

/* Enhanced Dark Mode */
.dark-mode {
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #ffffff;
    --text-muted: #b0b0b0;
    --border-color: #404040;
    --primary-color: #4dabf7;
    --success-color: #51cf66;
    --warning-color: #ffd43b;
    --danger-color: #ff6b6b;
}

.dark-mode .preview-modal {
    background: rgba(0, 0, 0, 0.9);
}

.dark-mode .loading-overlay {
    background: rgba(26, 26, 26, 0.9);
}

/* Responsive Improvements */
@media (max-width: 768px) {
    .preview-modal-content {
        margin: 1rem;
        padding: 1rem;
        height: auto;
        min-height: 60vh;
    }
    
    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 0.75rem;
        padding: 0.75rem;
    }
    
    .settings-actions {
        flex-direction: column;
    }
    
    .performance-info {
        font-size: 0.7rem;
        padding: 0.4rem 0.8rem;
        min-width: 150px;
    }
}

@media (max-width: 480px) {
    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 0.5rem;
        padding: 0.5rem;
    }
    
    .image-preview {
        height: 100px;
    }
    
    .image-info {
        padding: 0.5rem;
        font-size: 0.7rem;
    }
}