/* ===== CSS VARIABLES ===== */
:root {
    /* Primary Colors - Modern Purple/Indigo */
    --primary-color: #7c3aed;
    --primary-hover: #6d28d9;
    --primary-light: #a78bfa;
    --primary-dark: #5b21b6;
    
    /* Secondary Colors */
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --secondary-light: #94a3b8;
    --secondary-dark: #334155;
    
    /* Status Colors */
    --success-color: #10b981;
    --success-hover: #059669;
    --error-color: #ef4444;
    --error-hover: #dc2626;
    --warning-color: #f59e0b;
    --warning-hover: #d97706;
    
    /* Background Palettes */
    --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
    --bg-gradient-alt: linear-gradient(135deg, #f1f5f9 0%, #ddd6fe 100%);
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #1e293b;
    
    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --text-white: #ffffff;
    --text-on-primary: #ffffff;
    
    /* Shadows - Enhanced for depth */
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    
    /* Colored Shadows */
    --shadow-primary: 0 10px 15px -3px rgba(124, 58, 237, 0.15), 0 4px 6px -2px rgba(124, 58, 237, 0.1);
    --shadow-success: 0 10px 15px -3px rgba(16, 185, 129, 0.15), 0 4px 6px -2px rgba(16, 185, 129, 0.1);
    
    /* Glass Effects */
    --glass-white: rgba(255, 255, 255, 0.7);
    --glass-dark: rgba(15, 23, 42, 0.7);
    --glass-blur: 10px;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Transitions - Improved curves */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    
    /* Brand Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    --gradient-primary-light: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    --gradient-cool: linear-gradient(135deg, #7c3aed 0%, #3b82f6 100%);
    --gradient-sunset: linear-gradient(135deg, #f43f5e 0%, #f97316 100%);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
    letter-spacing: -0.01em;
}

/* ===== UTILITIES ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 0.875rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
    min-height: 3.25rem;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    transform: translate(-50%, -50%);
    transition: width var(--transition-normal), height var(--transition-normal);
    z-index: 1;
}

.btn:hover::before {
    width: 250%;
    height: 500%;
}

.btn svg, .btn img {
    width: 1.25rem;
    height: 1.25rem;
    position: relative;
    z-index: 2;
    transition: transform var(--transition-normal);
}

.btn:hover svg, .btn:hover img {
    transform: scale(1.1);
}

.btn span {
    position: relative;
    z-index: 2;
}

.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.5);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-on-primary);
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 25px -5px rgba(124, 58, 237, 0.3), 0 10px 10px -5px rgba(124, 58, 237, 0.2);
    filter: brightness(1.05);
}

.btn-primary:active {
    transform: translateY(0) scale(0.98);
    box-shadow: var(--shadow-primary);
    filter: brightness(0.95);
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--secondary-color);
    border: 2px solid var(--secondary-light);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--bg-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-md);
}

.btn-secondary:active {
    transform: translateY(0) scale(0.98);
    box-shadow: var(--shadow-sm);
}

.btn-primary .spinner {
    border-color: rgba(255, 255, 255, 0.3);
    border-top-color: white;
}

.btn-secondary .spinner {
    border-color: rgba(124, 58, 237, 0.3);
    border-top-color: var(--primary-color);
}

/* ===== HEADER ===== */
.header {
    padding: var(--spacing-lg) 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid rgba(124, 58, 237, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 38px;
    height: 38px;
    filter: drop-shadow(0 2px 5px rgba(124, 58, 237, 0.3));
    transition: all var(--transition-normal);
}

.header:hover .logo-icon {
    transform: rotate(10deg) scale(1.1);
}

.logo h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    position: relative;
}

.logo h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), transparent);
    border-radius: 2px;
    opacity: 0;
    transform: translateY(5px);
    transition: all var(--transition-normal);
}

.header:hover .logo h1::after {
    opacity: 0.3;
    transform: translateY(3px);
}

.made-by {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 500;
    background: linear-gradient(135deg, #a78bfa, var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    padding: 4px 8px;
    border-radius: var(--radius-md);
    margin-left: var(--spacing-sm);
    position: relative;
    transition: all var(--transition-normal);
}

/* ===== MAIN CONTENT ===== */
.main {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

/* ===== UPLOAD SECTION ===== */
.upload-section {
    margin-bottom: var(--spacing-2xl);
}

.upload-card {
    background: var(--bg-white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid #f1f5f9;
}

.upload-zone {
    border: 3px dashed #cbd5e1;
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(99, 102, 241, 0.05), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.upload-zone:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #f0f4ff, #e0e7ff);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.upload-zone:hover::before {
    transform: translateX(100%);
}

.upload-zone.dragover {
    border-color: var(--success-color);
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: var(--text-white);
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
}

.upload-zone.dragover .upload-icon,
.upload-zone.dragover .upload-content h3,
.upload-zone.dragover .upload-content p,
.upload-zone.dragover .upload-content small {
    color: var(--text-white);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.upload-icon {
    color: var(--text-light);
    transition: all var(--transition-normal);
    animation: float 3s ease-in-out infinite;
}

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

.upload-zone:hover .upload-icon {
    color: var(--primary-color);
    transform: scale(1.1);
    animation: bounce 0.6s ease;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.upload-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: color var(--transition-normal);
}

.upload-content p {
    color: var(--text-secondary);
    transition: color var(--transition-normal);
}

.upload-link {
    color: var(--primary-color);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 2px 6px;
    border-radius: 4px;
    text-decoration: underline;
    text-decoration-color: transparent;
}

.upload-link:hover {
    background: var(--primary-color);
    color: white;
    text-decoration-color: transparent;
    transform: translateY(-1px);
}

.upload-content small {
    color: var(--text-light);
    font-size: 0.75rem;
    font-weight: 500;
    transition: color var(--transition-normal);
    padding: 4px 8px;
    background: rgba(148, 163, 184, 0.1);
    border-radius: var(--radius-sm);
}

/* Error Message */
.error-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-lg);
    color: var(--error-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* ===== EDITOR SECTION ===== */
.editor-section {
    margin-top: var(--spacing-2xl);
}

.editor-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-2xl);
}

/* Canvas Area */
.canvas-area {
    background: var(--bg-white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(124, 58, 237, 0.1);
    position: relative;
    overflow: hidden;
}

.canvas-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), #8b5cf6, #ec4899);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

.canvas-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    min-height: 400px;
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    border-radius: var(--radius-xl);
    border: 2px dashed #cbd5e1;
    padding: var(--spacing-lg);
    position: relative;
    transition: all var(--transition-normal);
}

.canvas-container::after {
    content: 'Drop an image to get started';
    position: absolute;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.7;
    pointer-events: none;
}

.canvas-container.has-image {
    border: none;
    background: transparent;
    min-height: auto;
    padding: 0;
}

.canvas-container.has-image::after {
    display: none;
}

#canvas {
    max-width: 100%;
    max-height: 600px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    background: var(--bg-white);
    transition: all var(--transition-normal);
    display: block;
}

#canvas:hover {
    transform: scale(1.01);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.canvas-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(124, 58, 237, 0.1);
    margin-top: var(--spacing-lg);
}

/* Controls Panel */
.controls-panel {
    display: flex;
    flex-direction: column;
}

.controls-card {
    background: var(--bg-white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(124, 58, 237, 0.1);
    position: relative;
    backdrop-filter: blur(var(--glass-blur));
    overflow: hidden;
}

.controls-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #ec4899, #8b5cf6, var(--primary-color));
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    opacity: 0.85;
    box-shadow: 0 0 20px rgba(124, 58, 237, 0.5);
}

.controls-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 10px rgba(124, 58, 237, 0.2);
    letter-spacing: -0.01em;
    position: relative;
}

.control-group {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.control-group:not(:last-child) {
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid rgba(124, 58, 237, 0.1);
}

.control-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-normal);
}

.control-group:hover label {
    color: var(--primary-color);
}

/* Style Select Dropdown */
.style-select {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid rgba(124, 58, 237, 0.2);
    border-radius: var(--radius-lg);
    background: var(--bg-white);
    color: var(--text-primary);
    font-size: 0.925rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%237c3aed' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: calc(100% - 12px) center;
    background-size: 16px;
}

.style-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
    transform: translateY(-2px);
}

.style-select:hover {
    border-color: var(--primary-color);
    background-color: rgba(124, 58, 237, 0.05);
    transform: translateY(-2px);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.slider {
    flex: 1;
    height: 8px;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg, rgba(124, 58, 237, 0.1), rgba(124, 58, 237, 0.2));
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    transition: all var(--transition-normal);
}

.slider:hover {
    background: linear-gradient(90deg, rgba(124, 58, 237, 0.2), rgba(124, 58, 237, 0.3));
    height: 10px;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 3px 10px rgba(124, 58, 237, 0.3);
    border: 2px solid white;
    transition: all var(--transition-normal);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 0 5px rgba(124, 58, 237, 0.1), 0 5px 10px rgba(124, 58, 237, 0.3);
}

.slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 3px 10px rgba(124, 58, 237, 0.3);
    transition: all var(--transition-normal);
}

.slider::-moz-range-thumb:hover {
    transform: scale(1.2);
}

/* Special glow slider */
.glow-slider {
    background: linear-gradient(90deg, rgba(245, 158, 11, 0.1), rgba(249, 115, 22, 0.2));
}

.glow-slider:hover {
    background: linear-gradient(90deg, rgba(245, 158, 11, 0.2), rgba(249, 115, 22, 0.3));
}

.glow-slider::-webkit-slider-thumb {
    background: linear-gradient(135deg, #f59e0b, #f97316);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.4);
}

.glow-slider::-moz-range-thumb {
    background: linear-gradient(135deg, #f59e0b, #f97316);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.4);
}

.slider-value {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
    min-width: 45px;
    text-align: center;
    background: rgba(124, 58, 237, 0.1);
    padding: 4px 10px;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 4px rgba(124, 58, 237, 0.1);
    transition: all var(--transition-normal);
}

.slider-container:hover .slider-value {
    transform: scale(1.05);
    box-shadow: 0 3px 6px rgba(124, 58, 237, 0.15);
}

/* Style Options */
.style-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.style-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-white);
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    text-align: center;
}

.style-option:hover {
    border-color: var(--primary-color);
    background: rgba(124, 58, 237, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.style-option.active {
    border-color: var(--primary-color);
    background: rgba(124, 58, 237, 0.1);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.style-option-icon {
    width: 32px;
    height: 32px;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8fafc;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.style-option:hover .style-option-icon,
.style-option.active .style-option-icon {
    background: rgba(124, 58, 237, 0.1);
    color: var(--primary-color);
}

.style-option-name {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-normal);
}

.style-option:hover .style-option-name,
.style-option.active .style-option-name {
    color: var(--primary-color);
}

/* Preset Section */
.preset-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    position: relative;
}

.preset-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(124, 58, 237, 0.2), transparent);
}

.preset-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.preset-section h4::before,
.preset-section h4::after {
    content: '';
    height: 1px;
    flex: 1;
    background: linear-gradient(90deg, transparent, rgba(124, 58, 237, 0.1), transparent);
}

.preset-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.btn-preset {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.85rem;
    font-weight: 500;
    border: 2px solid rgba(124, 58, 237, 0.15);
    border-radius: var(--radius-lg);
    background: var(--bg-white);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
}

.btn-preset::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.05), rgba(124, 58, 237, 0.1));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.btn-preset:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(124, 58, 237, 0.1), 0 4px 6px -2px rgba(124, 58, 237, 0.05);
}

.btn-preset:hover::before {
    opacity: 1;
}

.btn-preset:active {
    transform: translateY(0) scale(0.98);
}

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

.preview-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(124, 58, 237, 0.2), transparent);
}

.preview-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.preview-section h4::before,
.preview-section h4::after {
    content: '';
    height: 1px;
    flex: 1;
    background: linear-gradient(90deg, transparent, rgba(124, 58, 237, 0.1), transparent);
}

.icon-preview {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 160px;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.05), rgba(139, 92, 246, 0.1));
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.icon-preview::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(124, 58, 237, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.icon-preview:hover::before {
    transform: translateX(100%);
}

#previewCanvas {
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 25px -5px rgba(124, 58, 237, 0.2), 0 10px 10px -5px rgba(124, 58, 237, 0.1);
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border: 3px solid rgba(255, 255, 255, 0.8);
    transition: all var(--transition-normal);
}

#previewCanvas:hover {
    transform: scale(1.1) rotate(2deg);
    box-shadow: 0 20px 30px -10px rgba(124, 58, 237, 0.3), 0 10px 15px -5px rgba(124, 58, 237, 0.2);
}

/* ===== FOOTER ===== */
.footer {
    padding: var(--spacing-xl) 0;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-white), #f8fafc);
    border-top: 1px solid rgba(124, 58, 237, 0.1);
    margin-top: auto;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
}

.footer p {
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.footer p span {
    color: var(--primary-color);
    font-weight: 600;
}

.footer p svg {
    color: #ef4444;
    width: 16px;
    height: 16px;
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

/* ===== NOTIFICATIONS ===== */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 15px 25px -5px rgba(16, 185, 129, 0.25), 0 10px 10px -5px rgba(16, 185, 129, 0.1);
    transform: translateX(100%) translateY(-10px);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1000;
    font-weight: 500;
    font-size: 0.925rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    max-width: 300px;
}

.notification::before {
    content: '';
    width: 20px;
    height: 20px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='white'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M5 13l4 4L19 7'%3E%3C/path%3E%3C/svg%3E");
    background-size: contain;
    flex-shrink: 0;
}

.notification.show {
    transform: translateX(0) translateY(0);
    opacity: 1;
}

.notification::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

/* ===== LOADING SPINNER ===== */
.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
    position: relative;
}

.spinner::before {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: pulse 1.5s ease-in-out infinite;
}

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

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

.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
    filter: grayscale(40%);
}

.btn:disabled:hover {
    transform: none !important;
    box-shadow: var(--shadow-sm) !important;
}

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .header {
        padding: var(--spacing-md) 0;
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .made-by {
        font-size: 0.75rem;
    }
    
    .main {
        padding: var(--spacing-lg) 0;
    }
    
    .upload-card,
    .canvas-area,
    .controls-card {
        padding: var(--spacing-lg);
        border-radius: var(--radius-xl);
    }
    
    .editor-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .controls-panel {
        order: 2;
    }
    
    .canvas-area {
        order: 1;
    }
    
    .canvas-actions {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .btn {
        justify-content: center;
        width: 100%;
    }
    
    #canvas {
        max-height: 400px;
    }
    
    .preset-buttons {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-2xl: 2rem;
        --spacing-xl: 1.5rem;
        --spacing-lg: 1rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .upload-zone {
        padding: var(--spacing-lg);
    }
    
    .upload-content h3 {
        font-size: 1rem;
    }
    
    .upload-content p {
        font-size: 0.875rem;
    }
    
    .controls-card h3 {
        font-size: 1.1rem;
    }
    
    #canvas {
        max-height: 300px;
    }
    
    .slider-container {
        flex-wrap: wrap;
    }
    
    .slider {
        order: 1;
        width: 100%;
    }
    
    .slider-value {
        order: 0;
        width: 100%;
        text-align: center;
        margin-bottom: var(--spacing-xs);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        min-height: 2.75rem;
    }
    
    .notification {
        left: 20px;
        right: 20px;
        max-width: none;
    }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus styles for keyboard navigation */
.upload-zone:focus-within {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.slider:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
        --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
        --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    }
    
    .upload-zone {
        border-width: 3px;
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}