/* CSS Variables */
:root {
    --primary: #8b5cf6;
    --primary-dark: #7c3aed;
    --secondary: #06b6d4;
    --accent: #3b82f6;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    --white: #ffffff;
    --black: #000000;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --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);
    
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    --transition: all 0.2s ease-in-out;
    --transition-slow: all 0.3s ease-in-out;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* App Layout */
.app {
    min-height: 100vh;
    padding: 1rem;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.title {
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.title-gradient {
    background: linear-gradient(135deg, var(--white) 0%, #e0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 42rem;
    margin: 0 auto;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.main-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 90rem;
    margin: 0 auto;
}

@media (min-width: 1024px) {
    .main-container {
        grid-template-columns: 2fr 1fr;
    }
}

/* Cards */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-2xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 32px 64px -12px rgba(0, 0, 0, 0.25);
}

.card-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-content {
    padding: 1.5rem;
}

/* Canvas Section */
.canvas-section {
    width: 100%;
}

.canvas-card .card-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
}

.search-container {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.canvas-container {
    position: relative;
    background: var(--gray-50);
    border-radius: var(--border-radius-lg);
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.art-canvas {
    width: 100%;
    max-width: 100%;
    height: auto;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    background: var(--white);
    display: block;
}

.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-lg);
    z-index: 10;
}

.loading-content {
    text-align: center;
}

.spinner {
    width: 3rem;
    height: 3rem;
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    box-shadow: var(--shadow);
}

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

.btn-outline {
    background: var(--white);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
    box-shadow: var(--shadow-sm);
}

.btn-outline:hover:not(:disabled) {
    background: var(--gray-50);
    border-color: var(--gray-400);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 1rem;
}

@media (max-width: 640px) {
    .search-container {
        flex-direction: column;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
    }
}

/* Stats */
.stats-container {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--gray-500);
}

.stat {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Settings Panel */
.settings-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.effects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.effect-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    background: var(--white);
    color: var(--gray-700);
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.effect-btn:hover {
    background: var(--gray-50);
    border-color: var(--primary);
}

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

.setting-group {
    margin-bottom: 1.5rem;
}

.setting-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--gray-700);
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--gray-200);
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow);
}

/* History */
.history-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.history-item {
    aspect-ratio: 1;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.history-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.history-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Themes */
.themes-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.theme-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.375rem 0.75rem;
    background: var(--gray-100);
    color: var(--gray-700);
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--gray-200);
}

.theme-badge:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
    transform: translateY(-1px);
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 3rem;
    padding: 2rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

.footer a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--white);
    text-decoration: underline;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    max-width: 20rem;
    animation: slideIn 0.3s ease-out;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--error);
}

.toast-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.toast-description {
    font-size: 0.875rem;
    color: var(--gray-600);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .app {
        padding: 0.5rem;
    }
    
    .card-content {
        padding: 1rem;
    }
    
    .effects-grid {
        grid-template-columns: 1fr;
    }
    
    .history-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .card-header {
        padding: 1rem;
    }
    
    .card-content {
        padding: 0.75rem;
    }
}